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EP2347673B1 - Procédé de fabrication d'une brosse à dents et brosse à dents - Google Patents

Procédé de fabrication d'une brosse à dents et brosse à dents Download PDF

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Publication number
EP2347673B1
EP2347673B1 EP10000699.8A EP10000699A EP2347673B1 EP 2347673 B1 EP2347673 B1 EP 2347673B1 EP 10000699 A EP10000699 A EP 10000699A EP 2347673 B1 EP2347673 B1 EP 2347673B1
Authority
EP
European Patent Office
Prior art keywords
head part
welding
carrier plate
toothbrush body
toothbrush
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP10000699.8A
Other languages
German (de)
English (en)
Other versions
EP2347673A1 (fr
Inventor
Jost Lötscher
Oskar Trevisan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trisa Holding AG
Original Assignee
Trisa Holding AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Trisa Holding AG filed Critical Trisa Holding AG
Priority to EP10000699.8A priority Critical patent/EP2347673B1/fr
Priority to PCT/EP2010/007797 priority patent/WO2011091835A1/fr
Priority to EP10795628.6A priority patent/EP2528472B1/fr
Priority to US13/520,438 priority patent/US8840192B2/en
Publication of EP2347673A1 publication Critical patent/EP2347673A1/fr
Application granted granted Critical
Publication of EP2347673B1 publication Critical patent/EP2347673B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A46D3/04—Machines for inserting or fixing bristles in bodies
    • A46D3/045—Machines for inserting or fixing bristles in bodies for fixing bristles by fusing or gluing to a body
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures

Definitions

  • the present invention relates to a method for producing a toothbrush according to the preamble of claim 1.
  • a method and a toothbrush of this type are from the document WO 03/086140 A1 known.
  • an integrally formed on a head part of a toothbrush body receiving geometry is provided with bristles and possibly other cleaning elements provided support plate which is secured by means of ultrasonic welding on the head part.
  • bristles and possibly other cleaning elements provided support plate which is secured by means of ultrasonic welding on the head part.
  • the neck part and the head part are bent relative to each other by a predetermined angle from their original shape. To ensure that the welding zone and the zone near the weld are still warm when bent, the bend is made immediately after the welding process.
  • the elastic region of the toothbrush body, the support plate and the welding zone is almost completely utilized.
  • no plastic deformation of these elements results from the described stretching, it is an elastic bending, that is to say a reversible bending.
  • the inventive method requires a bonding process between the support plate and the toothbrush body, so that at least a part of the material of the support plate and / or toothbrush body is melted, and thus a welding zone is formed by means of material.
  • a weld can be achieved by means of targeted heat or friction.
  • the material of the carrier plate is also locally melted by the extrusion material and it creates a material shortage.
  • ultrasound welding is discussed as a consequence, knowing that with the method according to the invention, the fracture behavior can also be improved for other welding or joining methods.
  • the inventive method can also be used at other locations of a toothbrush.
  • the welding zone is not provided in the head part, but in the neck part or grip part of the toothbrush, in the relevant welding zone and near-welding zone.
  • the neck portion is deflected relative to the head portion by an angle of 5 ° to 45 °, in particular by 15 ° to 25 °.
  • the deflection is preferably maintained for a predetermined period of time before the force is released.
  • This time period is preferably about 0.3 seconds to 5 seconds, in particular it is chosen between 0.5 seconds and 1.2 seconds.
  • the risk of breakage can be further reduced by providing a defined gap open to the front between a lateral surface of the receiving geometry in the head part and one of these opposite side surfaces of the support plate. This is preferably 0.03 mm to 0.35 mm, in particular 0.05 mm and 0.18 mm.
  • This gap can have a different width over its length.
  • the greatest width of the gap is preferably selected in an end section of the receiving geometry facing the neck part.
  • the risk of fractures can also be prevented by welding the metal between the outer surface of the receiving geometry and the side surface of the support plate by means of an adhesion reducer or an adhesive suppressor Support plate with the head part in this area, preferably at least in the neck portion facing the end portion of the receiving geometry is prevented.
  • the head part is held in a receiving element, while being acted upon by the force on the neck part.
  • the head part is supported in the receiving element on its underside facing away from the bristled upper side along a circumferential edge section, wherein the transition region from the head region to the neck region is free.
  • a sonotrode for holding the head part in the receiving element, for example, a sonotrode, by means of which previously the ultrasonic welding took place, or another element of the welding device can be used. Further, it is also possible to use another auxiliary device for holding the head part in the receiving element.
  • the neck portion in a head portion facing away from the end portion by means of a corresponding receiving element, and act with the force on the head part to deflect it relative to the neck portion bending.
  • the toothbrush body has a grip part, in the present case the grip part is preferably held by means of the receiving element.
  • the toothbrush body and the support plate can be made of a hard component in the one-component injection molding process. However, you can also in the two- or multi-component injection molding of a hard component and one or more soft components or from two or more hard components and optionally a soft component are produced.
  • the hard component or components form the supporting part of the toothbrush body and the support plate.
  • a hard component in the case of a non-transparent brush is preferably PP, most preferably PP having an E-modulus of 1000 - 2400 N / mm2, preferably 1300 bis 1800 N / mm2 used.
  • PP polypropylene
  • E-modulus 1000 - 2400 N / mm2
  • 1300 bis 1800 N / mm2 used.
  • polyesters such as the listed BR003, CAP, PA, PMMA, SAN or ABS as the hard component.
  • the soft component used is preferably a TPE-S.
  • the Shore A hardnesses of the soft plastic are preferably below 90 Shore A.
  • Fig. 1 and 2 show a part of a toothbrush 10 produced by a method according to the invention with a toothbrush body 12 and a bristle carrier element 18 inserted in a head part 14 in a receiving geometry 16 and secured to the head part 14.
  • This has a support plate 20, of which in a known manner the bristles 22 of a bristle field 24 protrude.
  • the receiving geometry 16 has a circumferential lateral surface 26 and the support plate 20 on one of these facing side surface 28. Between the lateral surface 26 and the side surface 28, a circumferential gap 30, preferably an air gap, is present.
  • the toothbrush body 12 then has, following the head part 14, a neck part 32, which adjoins it in one piece, from which in the Fig. 1 and 2 only a portion facing the head part 14 is shown.
  • a grip part 34 adjoins the neck part 32, on the side facing away from the head part 14, and which engages in Fig. 9 is shown.
  • the bristles 22 of the bristle field 24 are on the front side 36 of the toothbrush body 12 of support plate 20 from.
  • the exposed surface of the support plate 20 is aligned with the corresponding surface of the toothbrush body 12.
  • the toothbrush body 12 is provided on the rear side 38 facing away from the front side 36 in the head part 14 with a tongue cleaner 40.
  • a tongue cleaner 40 Embodiments without tongue cleaner 40 are also possible.
  • the toothbrush body 12 in the neck part 32 and head part 14 consists of a hard component.
  • the tongue cleaner 40 is molded from a soft component to the hard component or also that the soft component for decorative purposes larger surface portions of the surface of the toothbrush body 12, in particular of the head part 14, occupies.
  • a breaking point area 42 in which the risk of brittle fractures, if not, as in accordance with the present Invention, the toothbrush body 12 is stretched by bending the head portion 14 relative to the neck portion 32.
  • Fig. 3 shows in a central longitudinal section on the one hand the same part of the toothbrush body 12 as in Fig. 1 and 2 is shown, and on the other hand, the bristle carrier element 18 with the protruding from these bristles 22 of the bristle field 24 in an exploded view.
  • the receiving geometry 16 is formed by a stepped recess 44, which is open towards the front side 36, in the head part 14, the bottom 46 of which is closed towards the rear side 38 by a wall of the toothbrush body 12.
  • the oval recess 44 in view of the front side 36 is delimited from the front side 36 of the toothbrush body 12 up to a step 48 by the lateral surface 26 which, in the present example, extends at right angles to the front surface of the toothbrush body 12 in the head part 14.
  • the recess 44 reducing step 48 extends in a plane parallel to the front side 36 of the head part 14 and from it is at the radially inner edge acting as an energy concentrator / Energysgeber welding bead 50 in the direction against the front 36 before.
  • the cross section of the welding bead 50 which is preferably completely circumferential and self-contained, is preferably triangular.
  • the welding bead 50 can also be designed differently.
  • the width (preferably not the height) may vary over the circumference.
  • the welding bead 50 may have a shape that is interrupted in the direction of rotation, for example, with individual welding points arranged one behind the other or aligned one after the other individual welding edges, wherein the distances and lengths of the elements may vary in both cases.
  • Welding points can be designed, for example, pyramidal or conical.
  • the height of the welding bead 50 is between 0.05 mm and 0.8 mm, preferably between 0.15 mm and 0.4 mm.
  • the recess 44 is bounded by a lower, second lateral surface 52, which preferably also extends at right angles to the front side 36 of the head part 14 or slightly conically tapering to the bottom 46.
  • the base 46 has a circumferential groove-like depression 54 in an edge region adjoining the second lateral surface 52.
  • the width of the step 48 on the neck portion 32 facing side is greater than on the free end of the head part 14 facing side.
  • the width of the step 48 is between 0.6 mm and 2 mm, preferably 1 mm and 1.2 mm.
  • the step 48 measured from the bottom 46 to the front 36 of the head part 14, is arranged to a maximum of 70%, preferably at most 66% of the total height, and 50% or less are also conceivable.
  • the welding bead 50 and the later-generated welding zone 51 should be placed as close to the ground 46 as possible.
  • the depth of the recess 44 that is the dimension of the front side 36 to the bottom 46, is 1.8 mm to 2.6 mm preferably 2.1 mm to 2.3 mm.
  • the groove-like depression 54 has a depth measured from the front side 36 of 2.5 mm to 3.5 mm, preferably from 2.8 mm to 3.2 mm.
  • the height of the step 48, measured from the front side 36 forth, is between 0.6 mm and 2 mm, preferably between 1 mm and 1.2 mm.
  • the in the embodiment shown on the front side 36 flat support plate 20 is shaped such that its peripheral side surface 28, in the assembled state, at least approximately parallel to the jacket wall 26 and the gap 30 forming at a distance to this.
  • This means that the shape of the recess 44 is in each case adapted to the shape of the support plate 20 or of the bristle carrier element 18. The two can therefore assume geometrically other forms, must be coordinated in each case.
  • a step-like planar counter-surface 56 corresponding to the step 48 is formed, which is bounded radially inwardly by a centering wall 58 which projects from the support plate 20 on its rear side.
  • the radially outer surface of the centering wall 58 is formed opposite the second lateral surface 52, the receiving geometry 16 and serves to center the bristle carrier element 18 in the toothbrush body 12.
  • the width of the gap 30 can also be maintained in practice in any case, it is necessary to correspondingly tolerate the tools for producing the toothbrush body 12 or the recess 44 and the support plate 20.
  • This requires the tolerances of the support plate 20 and the recess 44 of the toothbrush body 12 in the region of the receiving geometry 16 to be matched to each other, so that the support plate 20 at maximum dimensions in combination of the recess 44 of the toothbrush head with minimal mass the gap 30 still in the specified dimension.
  • the tolerances of the centering wall 58, inner edge and outer edge of the counter surface 56, and the tolerance of the side surface 28 on each other and on the recess 44 and the receiving geometry 16 in the toothbrush body 12 must be coordinated.
  • the tolerances of the inner and outer edges of the step 48, the lateral surface 26 must be matched to each other and said tolerances of the support plate 20.
  • the support plate 20 With respect to the circumferential centering wall 58 radially inward, the support plate 20 from the front of the support plate 20 to its back continuous bristle receiving passages 60 on.
  • the bristle carrier element 18 is, for example, the carrier plate 20 by injection molding, in the present case preferably made of a hard component.
  • cleaning and massage elements 22 ' may be injection-molded from a soft component on the support plate 20.
  • the bristles 20 forming the bristle field 24 are passed through the bristle receiving passages 60 and aligned to form the tooth cleaning geometry.
  • the bristles 20 are melted in their over the back of the support plate 20 projecting end portion, for example by means of a punch, whereby on the back of the support plate 20 and within the area bounded by the centering 58 forms a melt film 62 of molten bristle material.
  • the bristles 22 form the bristled bristle carrier element 18.
  • the bristle bristle carrying member 18 is inserted from the front 36 into the receiving geometry 16 of the toothbrush body 12 until the counter surface 56 of the support plate 20 comes to rest on the welding bead 50 of the receiving geometry 16 of the head part 14.
  • the centering is carried out by the interaction of the centering wall 58 with the second lateral surface 52 and their lying in the direction of the front side 36 final edge.
  • the melting of the bristles 22 to form the melt film 62 is such that the centering wall 58 tilts radially inwardly due to the action of heat.
  • the result of this change in geometry through the process is that the centering wall 58 forms, as it were, an inlet slope towards its point of attachment, and thus the closing edge in the region of the mating surface 56 is used for the centering.
  • the recess 54 prevents the lining of the rear end surface of the centering wall 58 at the bottom 46th
  • the Cartridge 20 After inserting the bristled bristle support member 18 in the receiving geometry 16 of the head part 14 is the Cartridge 20 by means of ultrasonic welding firmly connected in a known manner with the toothbrush body 12.
  • the welding bead 50 on the toothbrush body 12 serves as an energy concentrator / energy director. It is liquefied during the ultrasonic welding and forms a welded connection with the material of the support plate 20 in the region of its counter surface 56 and forms a welding zone 51.
  • the melt can spread in the region of the step 48 and also melt on the welding bead 50 near regions. preferably, a penetration into the gap 30 is to be prevented.
  • the ultrasonic welding preferably occurs between two compatible hard components which allow a material closure, preferably between two equal hard components.
  • welding zone 51 To the in the Fig. 5 to 8 welding zone 51 shown is that this is shown in a stylized and simplified manner as welding bead 50 immersed in the support plate 20. That is, the two elements are shown as an overlap. In practice, however, this is different, a practice equivalent representation is in Fig. 15 shown.
  • the welding bead 50 is melted. Its material and also the acting welding energy also heat and melt the welding bead 50 near areas of the support plate 20 and the receiving geometry 16. This melting finally brings a material closure between the toothbrush body 12 and the support plate 20. Further, the material in the areas near the welding zone 51st heated by welding, this area is referred to as near-welding zone.
  • the step 48 is wider in this area, and the distance between the jacket wall 26 and the welding bead 50 is preferably selected larger than in the other areas; compare in particular FIGS. 5, 6 and 8 which show an end section of the receiving geometry 16 facing the free end region of the head part 14, an end section of the receiving geometry 16 facing the neck part 32 and the receiving geometry 16 in the longitudinal center of the head part 14.
  • Fig. 9 shows a radially outer edge portion of an indexable about a vertical axis rotatable round table 64 ', on which circumferentially, for example, offset by 90 °, each distributed a receiving element 64 for the head portion 14 of a toothbrush body 12.
  • the receiving element 64 is in Fig. 10 , across from Fig. 9 enlarged and in plan view, also shown.
  • the receiving element 64 has a receiving recess 66 which is open towards the top and which supports the head part 14 on the rear side 38 in a support section 68 extending around the tongue cleaner 40. Radially inside of the support portion 68, the receiving recess 66, for the release of the tongue cleaner 40, formed recessed.
  • the shape of the receiving recess 66 may follow the geometry of the back of the toothbrush head, an exemption is possible but not mandatory.
  • the height of the receiving recess 66 supports the head portion 14 of the toothbrush at a level of 40% to 70% of the total height of the toothbrush body 12 in the head part 14th
  • the support portion 68 extends on the back 38 at least near the region of the step 48 and the welding bead 50, seen in a projection at right angles to the front side 36.
  • FIGS. 9 and 10 can be removed, extends from the receiving recess 66 an exemption recess 70 toward the free edge of the receiving element 64, which frees the toothbrush body 12 in the transition region from the head part 14 to the neck portion 32 and the neck portion 32.
  • the cutout recess 70 ends at least approximately at the neck part end of the receiving geometry 16, or the recess 44 for the bristle carrier element 18th
  • the end of the relief recess 70 is preferably adjusted so that at least at right angles to the front side 36 the step 48 and the welding bead 50 are in line with the support section 68, the relief recess 70 preferably bears directly against the support section 68. This ensures that the receiving geometry 16 or the welding bead 50 is supported in the region perpendicular to the front side 36 during the ultrasonic welding process, so that optimum welding is made possible and yet the bending process is not hindered.
  • Fig. 10 In addition to the exemption well 70 is in Fig. 10 also the lateral exemption range 70 'shown. This exposes the toothbrush body perpendicular to the release direction of the release recess 70, in this case in a plane parallel to the front side 36 of the support plate 20.
  • the release of the neck portion 32 of the toothbrush body 12 allows the toothbrush body 12 to "move freely” during the bending process. Basically, a free space for displaced material should be created in this way, so that it is not inhibited by a receiving geometry of the device.
  • the lateral exemption 70 takes place at the earliest from a range of 75% of the length of the support plate 20, measured from the free end of the bristle field 24. So that the welding happens optimally and also on the front side 36 of the toothbrush body 12 a possibility of material displacement is present a sonotrode 76 may be designed so that they are in the direction of Toothbrush body 12 lying end is slightly free after the support portion.
  • the toothbrush 10 is shown with the head part 14, with the back 38 ahead, inserted into the receiving recess 66, while the neck portion 32 and the adjoining this handle portion 34 are exposed.
  • the grip part 34 may have, for example, a thumb rest 72 and a forefinger rest 74 made of a soft component.
  • regions of the neck part 32 and / or of the head part 14 and / or also of the grip part 34 can be equipped with a soft component in a known manner.
  • Fig. 9 the sonotrode 76 can be seen, with which in a welding station of the toothbrush manufacturing device the bristle carrier element 18 provided with bristles 22 and the head part 14 or the toothbrush body 12 are welded together.
  • the sonotrode 76 is, at least in its end portion facing the receiving element 64, annular, that is formed with a cavity in the interior for the bristle field 24.
  • This is in Fig. 1 and 4 in the form of a contact surface 78 of the sonotrode 76 on the carrier plate 20 indicated.
  • This contact surface 78 runs in the head part 14 of the toothbrush around the bristle field 24 respectively in line over the welding bead 50.
  • the over the support plate 20 projecting bristles 22 and optionally the rubber-elastic cleaning elements find in the cavity in the sonotrode 76 place.
  • Fig. 9 the bending process is indicated.
  • a support is introduced below the grip part 34, which supports and guides the toothbrush body 12. This support is not shown in the figure and is removed or moved away for the bending process.
  • the welding station is associated with a stretching device 80, which is intended, the neck portion 32 relative to the head part 14, from the in Fig. 9 shown original shape to bend the angle ⁇ , and after a certain waiting time to release again.
  • the stretching device 80 a cylinder-piston unit 82, the piston is provided at the free end with a roller 84.
  • the direction of movement of the roller 84 is orthogonal to a plane defined by the front side 36 of the support plate 20 and the head part 14. Further, the stretching device 80 is arranged such that the roller 84 comes in a remote from the head part 14 and lying at the handle portion 34 end portion 32 ', the neck portion 32, on the front, comes to rest. By the extension movement of the cylinder-piston unit 82, the roller 84 presses on the surface of the toothbrush body 12, rolls on this and deflects the body by the angle ⁇ .
  • the sonotrode 76 is lowered onto the support plate 20 of the bristle support member 18, and by exciting the sonotrode 76, the ultrasonic welding process between the support plate 20 and the head part 14 in a known manner.
  • the sonotrode 76 remains (in an unexercited manner) on the bristle carrier element 18 in abutment in order to hold the head part 14 during the subsequent stretching operation.
  • the roller 84 For stretching by bending, by driving the cylinder-piston assembly 82, the roller 84, in the manner of a ram, brought to the end portion 32 'of the neck portion 32 into abutment and then further lowered by a predetermined stroke to the neck portion 32 relative to the head portion 14th to bend the angle ⁇ . After a predetermined period of time, during which the roller 84 is held in the lowered position, the roller 84 is retracted by the cylinder-piston unit 82 back to the starting position, so that the toothbrush body 12, due to its elasticity, move back to its original shape can.
  • the surface of the roller is concaved to optimally guide the neck portion 32 of the toothbrush body 12 and to pass the deflection in a direction perpendicular to the bristle field 24. This ensures that the toothbrush body 12 does not twist due to the shape of the roller.
  • the design of the second plunger for the return movement is determined by two factors, the speed of the return movement and the effective Position after moving back. If the speed of the backward movement is too small, the cycle of the machine is slowed down, that is, the cycle time becomes larger, resulting in poorer efficiency with less output. The second factor, the position after the return, plays a role in that the support is brought back into the original position after the stretching operation. If the toothbrush is not in the same position at the time as it was originally, it may cause malfunction in the machine and affect process consistency.
  • roller it is possible to form the roller other than specified.
  • non-rotatable systems conceivable that preferably rest on the surface of the toothbrush body 12 with low friction.
  • Geometrically are thus also plates with rounded edges as a pressing element analogous to the roller conceivable.
  • these alternative elements are provided with a layer with low frictional resistance.
  • the angle ⁇ is chosen between 5 ° and 45 °, preferably it is in the range of 15 ° to 25 °.
  • the angle ⁇ is defined by the imaginary line from the bending axis to the free end 90 of the handle portion 34 as an angle between the original state and the deflected state.
  • the relief recess 70 and a passage or recess 86 in the rotary table 64 ', see Fig. 10 allow collision-free bending around this angle.
  • the elasticity of the toothbrush body 12 is disregarded, which means that it is assumed that it behaves rigidly outside the bending zone; no correction factor for the elasticity is introduced. Basically, however, it is the case that the elasticity is lower when the action of the stretching device passes closer to the clamping of the head part 14.
  • the bending axis at least approximately parallel to the front side 36 of the head part 14 and at right angles to the longitudinal axis of the toothbrush body 12 around which the toothbrush body 12 bends by the force exerted on it by means of the stretching device 80 lies at least approximately at the transition from the head area to the neck area, ie approximately in the Fig. 1 designated area of breakage 42 area in which the risk of brittle fracture is greatest.
  • the bending takes place within a narrow region, viewed in the longitudinal direction of the toothbrush 10, in which the bending axis 88 lies.
  • the length of the region is between 1 mm and 10 mm, preferably between 2 mm and 5 mm, measured from the position of the welding bead 50 on the longitudinal axis of the toothbrush 10 in the direction of the neck portion 32 of the toothbrush body 12.
  • the distance between the last bristles 22 on the longitudinal central axis of the bristle field 24 and the point at which the stretching device 80 acts on the toothbrush body 12 is 20 mm to 60 mm, preferably 30 mm to 50 mm.
  • the point of action of the stretching device 80 on the toothbrush body 12 is preferably in front of the thumb rest 72.
  • the speed at which the stretching device 80 acts on the toothbrush body 12 in order to bend it by the angle ⁇ is controlled via a throttle on the cylinder-piston unit 82 or in its supply and is selected according to the circumstances.
  • the start of the stretching operation is preferably controlled by the position of the sonotrode 76. Between 0.1 seconds and 0.8 seconds, preferably 0.2 seconds, after the sonotrode 76 has reached its final position in the welding process, but the welding is still in progress, the stretching process begins as the support moves away and then moves out ram.
  • the toothbrush body 12 In the deflected position (stretching position), the toothbrush body 12 is held for 0.3 seconds to 2 seconds, preferably between 0.5 seconds and 1.2 seconds.
  • the whole additional process that is from the time in which the vibration of the sonotrode 76 is stopped until at the time the sonotrode is raised is called the hold time.
  • This takes between 0.8 seconds and 2 seconds, preferably 1 second, with an integrated stretching process. This ensures that with the stretching process no loss of efficiency must be taken into account and the machine must therefore take no extension of the cycle time in purchasing.
  • the hold time used in the invention is greater than the hold time in the "normal" process, in this case it is in the range of 0.1 second to 0.8 second, preferably 0.2 second to 0.5 second.
  • the cycle time for welding and stretching should be lower than the cycle time for the bristling of a carrier plate 20 (machine cycle time) in the case of in-line production.
  • the width of the gap 30 between the head part 14 and the support plate 20, that is, between the side surface 28 of the support plate 20, and lateral surface 26 of the receiving geometry 16 is between 0.03 mm and 0.35 mm, preferably between 0.08 mm and 0, 18 mm selected.
  • the gap 30 in its neck portion 32 facing the end portion is wider than in the lateral portions and in the free end of the head portion 14 facing end portion.
  • the width of the gap 30 is preferably 0.1 mm to 0.2 mm in the end portion facing the neck portion 32, 0.09 mm to 0.19 mm in the end portion facing the free end, and 0.03 mm therebetween, in the lateral portions to 0.35 mm, preferably 0.05 mm to 0.18 mm.
  • the change of the gap width is preferably continuous. But it is also conceivable to form a gap 30 having circumferentially a constant width in the range between 0.03 mm and 0.35 mm, preferably between 0.08 mm and 0.18 mm.
  • the toothbrush body 12 produced in a generally known manner by the injection molding process (one-component, two-component or multi-component injection molding process) and in the generally known manner in injection molding.
  • Method one-component or two-component injection molding method
  • bristle carrier elements 18 bristled AFT plate supplied, and then the welding of bristled with the head part 14 of the toothbrush body 12 bristle carrying member 18, preferably by means of ultrasonic Welding.
  • the stretching of the toothbrush body 12 heated by the welding takes place by bending the head part 14 relative to the neck part 32, for example as described above in connection with FIGS. 9 and 10 is described in more detail.
  • the toothbrush which is in its original form again, is fed to 10 further process steps, for example for packaging, labeling or the like.
  • Fig. 12 For example, one possible embodiment of contacting the toothbrush body 12 with the bristled bristle carrier member 18, ultrasonic welding, and subsequent bending for stretching purposes is shown in more detail.
  • This procedure shows, inter alia, the application of the invention to an existing machine which performs the bristling of the toothbrush by means of the AFT method.
  • the toothbrush body 12 is fed to the rotary table 64 'and inserted into the receiving recess 66 of a receiving element 64 on the rotary table 64', cf. Fig. 10 ,
  • a clamping mechanism of the toothbrush body 12 is clamped in the region of the neck portion 32 or the handle portion 34 on the receiving element 64 and on a support, not shown, in the handle portion 34.
  • the rotary table 64 ' (see in particular also Fig. 9 ) rotated by 90 °, for example.
  • a supplied bristled bristle carrying element 18 is inserted into the receiving geometry 16 or recess 44 of the head part 14; compare to 3 and 4 ,
  • the bristle carrier element 18 inserted into the toothbrush body 12 can be held in the receiving geometry 16. Under this holding another rotation of the rotary table 64 'takes place, for example, again by 90 °.
  • the clamping mechanism which clamps the tooth bust body 12 on the supports, mechanically solved something and in parallel stabilized so that it exerts only a slight, no further increasing pressure on the toothbrush body 10. This ensures that the clamping mechanism takes no further influence on the process in this position of the rotary table 64 '.
  • re-clamping may take place by moving a so-called secondary holding mechanism for holding the bristle carrying member 18 thereto, and then moving the primary holding mechanism away therefrom.
  • the secondary holding mechanism also has the task, in addition to holding the bristle carrier element 18, of pressing the bristles 22 on the bristle field 24 in the direction of the center of the bristle carrier element 18. This creates space that the sonotrode 76 - see Fig. 8 -, Preferably by lowering, can be fed to the support plate 20 and that the bristles 22 are introduced during lowering of the sonotrode 76 in said cavity of the sonotrode 76. Then the secondary holding mechanism is released so that the sonotrode 76 can be moved up to the support plate 20 or head part 14 zoom.
  • the welding process is carried out for a predetermined time, for example of 0.03 seconds to 0.8 seconds, preferably from 0.05 seconds to 0.2 seconds, in particular 0.08 seconds.
  • the gripping part 34 has been supported up to this time by means of a support, not shown in the figures. If this was the case, at the present time this edition is moved away, so that the grip part 34 is released. Since the clamping mechanism has been released, the toothbrush body 12 is not loaded for a moment after driving away the support.
  • the neck portion 32 relative to the head portion 14 by the angle ⁇ , held in this deflected position said period and then released again.
  • This allows the toothbrush body 12 to move back to its original shape, due to its elasticity, automatically back.
  • this retraction can be assisted by delivery of the aforementioned support to the handle portion 34 or by other means.
  • the sonotrode 76 from the welding position, can be raised by 0.1 mm to 0.5 mm, preferably 0.2 mm to 0.3 mm. This space can be created so that the toothbrush body 12 can expand during the stretching process at the appropriate places.
  • the position is not changed, the sonotrode 76 remains in the position in which the welding is completed. A change of position can at best by forces take place, which act on the sonotrode 76 by the stretching process through the toothbrush body 12.
  • the sonotrode 76 for example, by lifting, moved away from their investment in the bristle carrier element 18 and the rotary table 64 ', for example rotated by a further 90 °. Parallel to the start of rotation or immediately before the clamping mechanism is released again so that he holds the toothbrush body 12 on the receiving element 64 and the support again under full pressure, including during rotation of the rotary table 64 '.
  • the clamping mechanism is first released and the toothbrush released. The finished bristled and stretched toothbrush 10 is then removed from the receiving element 64 and the support and, for example by means of a robot or manipulator, supplied to the further process steps.
  • another process step may be to round the ends of the bristles 22 in a known manner.
  • Another process step may be that the toothbrush body 12 is labeled or printed or embossed.
  • Another process step may be that the toothbrush 10 is packaged.
  • the Fig. 13 illustrates in a Weg-force diagram as an example of the behavior of a toothbrush 10 whose toothbrush body 12 has not been stretched by bending the head part 14 relative to the neck portion 32.
  • a Force applied which is the same direction throughout the test and dressed in the unloaded state at right angles to the front 36 on the support plate 20.
  • Fig. 14 shows the path-force diagram for a toothbrush 10 prepared according to the present invention, the toothbrush body 12, as described above, was stretched.
  • the region of the approximately linear relationship between displacement (path) and force is approximately twice as large as when the toothbrush body 12 is not stretched (cf. Fig. 13 ) and then there is not a break, but a plastic deformation. This can be seen in the diagram due to the rounded shape of the curve and a desired result of the invention.
  • FIGS. 15 and 16 is shown in sectional view, as the interface geometry between the support plate 20 and the toothbrush body 12 may look after welding by welding.
  • the illustrations are based on Analyzes of the welding of sliced and polarized bodies.
  • a possible form of the result of the welding is shown. It can be seen that a third zone has formed between the toothbrush body 12 and the support plate 20 as a result of the welding.
  • This welding zone 51 is shown simplified as a separate zone, but in the result it is a connection between the two adjacent elements and preferably forms together with them a continuous body. It can also be seen that the molten material does not spread into the gap 30 and thus does not contact the lateral surface 26 and the side surface 28 or are not connected by material. This figure also shows that, for example, a part of the support plate 20 can be melted and the welding zone 51 can also spread in the region of the centering wall 58.
  • the welding zone 51 does not spread so far that no fusion in the form of the welding zone 51 propagates between the centering wall 58 and the support plate 20.
  • the Fig. 15 shows only one case from practice.
  • the image in this area of the toothbrush 10 may vary from toothbrush to toothbrush.
  • Many factors play a role in the shape and propagation of the weld zone 51. These include on the one hand the tolerances in the field of injection-molded parts, such as support plate 20 and toothbrush body 12, as well as any influences that bring the melting and fixing of the bristles on the support plate 20 with it.
  • the welding process plays a big The role, for example, the welding parameters as well as the tolerances in the structure of the welding arrangement in the process a role.
  • Fig. 16 shows a situation how to avoid it.
  • the difference compared to Fig. 15 is that the welding zone 51 and with it the molten material in the region of the gap 30 between the lateral surface 26 and the side surface 28 flows or flows into him. It can also be seen that the melt and the welding process also melt welding-near geometries. This is when comparing the FIGS. 15 and 16 It can be seen that the gap walls, that is, the jacket surface 26 and the side surface 28, in Fig. 16 no longer run as they were made in injection molding. This also shows how the connection of support plates 20 and toothbrush body 12 in the region of the interface of the welding zone 51 proceeds. By melting additional material, the welding is supported.
  • toothbrushes 10 completely in the IMT process and to improve them by stretching in the still warm state from injection molding. In this case, the warm state usually results from injection molding and not from a welding process.
  • Another boron process that can be used in the context of the present invention is the IAP (Integrated Anchorless Production) process. Again, the brush is stretched while still warm.
  • IAP Integrated Anchorless Production
  • the embodiment shown, in which the receiving element 64 together with the other devices required around a rotary table 64 'is arranged, is to be regarded as an example. It is also possible to arrange the receiving element 64 in a circulating chain, an endless conveyor or another appropriately adapted transport means and thus implement the invention in the production process.
  • the inventive manufacturing method is not only suitable for manual toothbrushes, but also for the production of sonic toothbrushes and electric toothbrushes with rotating and / or pivoting head parts 14th
  • the reference numeral 22 'in Fig. 1 relates to rubber-elastic cleaning and massage elements, which instead of Bristles 22 or may be provided together with bristles 22 on the support plate 20. Further 20 further additional elements can be integrated into the support plate, such as movable or fixed-shaped elements with snap or snap connections.
  • the method according to the invention is particularly suitable when the toothbrush body 12 has become warm by means of the action of ultrasound in the region of the head part 14 and / or of the neck part 32.
  • adhesion reducers or adhesion suppressants may be printed, painted or sprayed onto the lateral surface 26 and / or the side surface 28.
  • a soft component could be designed laterally on the support plate 20, which acts like a seal, can not be welded (due to the material properties), the gap 30 fills and thus avoids the lateral welding.
  • the counter surface 48 on the support plate 20 and / or the step 48 are geometrically adjusted.
  • this element can capture a portion of the melt created during ultrasonic welding so that the melt does not penetrate into the gap 30, thus causing deterioration of the fracture behavior.
  • the welding bead 50 may, for example, also be arranged at the free end of the centering wall 58.
  • the correspondingly adapted elements bottom 46 and groove-like recess 54 contribute to the fact that the welding takes place between the support plate 20 and the toothbrush body 12 in the region of the bottom.
  • the position of the welding bead 50 can also be varied in relation to the distance from the bottom 46 or to the front side 36 of the toothbrush body 12. In this case, the position is, as already described above, formed rather deeper than shown. Other possibilities not listed arrangement and geometric adjustment of the elements are not excluded from the invention.
  • the ultrasonic welding process is defined by means of various parameters.
  • the welding path ie the distance which the sonotrode 76 travels during the welding, is preferably between 0.15 mm and 0.2 mm, between 0.05 mm and 0.4 mm.
  • the sonotrode 76 with ultrasound at a frequency of 25,000 Hz to 45,000 Hz, preferably from 35,000 Hz to 40,000 Hz, with an amplitude of 0.02 mm to 0.12 mm, preferably 0.05 mm excited to 0.09 mm.
  • an energy of 5 Ws to 35 Ws spent preferably 15 Ws to 25 Ws.
  • the welding process takes 0.03 seconds to 0.8 seconds, preferably of 0.05 seconds to 0.2 seconds, in particular 0.08 seconds.
  • design variants shown in this document are exemplary and the individual forms and elements of these design variants can be combined with other design variants without departing from the scope of this invention.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Brushes (AREA)

Claims (14)

  1. Procédé pour la fabrication d'une brosse à dents, dans lequel un corps de brosse à dents (12) présentant au moins une tête (14) et un col (32) relié à la tête (14) et portant celle-ci est produit, la tête (14) est munie d'une plaquette de support (20) avec des poils (22) et la plaquette de support (20) est fixée à la tête (14) par soudage, et ensuite une force est exercée sur le corps de brosse à dents (12), caractérisé en ce que le col (32) et la tête (14) sont pliés l'un par rapport à l'autre d'un angle prédéterminé (α) à partir de la forme originale, encore dans un état chaud de la zone de soudage (51), au moyen de la force et de ce fait au moins dans une zone proche de la zone de soudage (51) les molécules sont orientées par étirement, et en ce que la force est supprimée après le pliage de façon à permettre au corps de brosse à dents (12) de se replier dans sa forme originale.
  2. Procédé selon la revendication 1, caractérisé en ce que le pliage du corps de brosse à dents (12) se passe de façon réversible dans la région élastique.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'angle (α) est de 5° à 45°, préférablement de 15° à 25°.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le pliage est maintenu pendant un temps prédéterminé et ensuite la force est supprimée.
  5. Procédé selon la revendication 4, caractérisé en ce que le temps est de 0,3 s à 5 s, préférablement 0,5 s à 1,2 s.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le temps de cycle pour l'empoilage de la plaquette de support (20) est plus long que le temps nécessaire pour le soudage et le pliage.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'une forme de réception (16) pour une plaquette de support (20) est formée sur la tête (14) lors de la fabrication du corps de brosse à dents (12), ensuite la plaquette de support (20) munies de poils (22) est insérée dans la forme de réception (16), la plaquette de support (20) est fixée à la tête (14), préférablement par soudage par ultrason, et ensuite le col (32) est plié par rapport à la tête (14) au moyen de la force.
  8. Procédé selon la revendication 7, caractérisé en ce que le pliage se passe dans la zone de soudage (51) chauffée par le soudage par ultrason et dans une zone proche de la soudure.
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que, quand la forme de réception (16) est fabriquée, une enveloppe (26) est formée de telle sorte qu'une fente (30), préférablement de 0,03 mm à 0,35 mm, entre ladite enveloppe (26) et une surface latérale (28) de la plaquette de support (20) reste libre quand plaquette de support (20) est insérée de façon à éviter le soudage à cet endroit.
  10. Procédé selon la revendication 7 ou 8, caractérisé en ce que les tolérances de la tête (14) avec la forme de réception (16) et de la plaquette de support (20) sont définies de façon à ce que, avec la taille maximum de la plaquette de support (20) et la taille minimum de la forme de réception (16), une fente (30) présentant une largeur de 0,03 mm à 0,35 mm est conservée entre l'enveloppe (26) de la forme de réception (16) et la surface latérale (28) de la plaquette de support (20) de façon à ce qu'aucun matériau de la zone de soudage (51) ne pénètre dans la fente (30), et préférablement les tolérances d'une paroi de centrage (58) s'étendant à partir de la plaquette de support (20) et d'une seconde enveloppe (52) de la forme de réception (16) interagissant avec celle-ci ainsi que d'une marche (48) s'étendant entre l'enveloppe (26) et la seconde enveloppe (52) et d'une surface opposée (56) de la plaquette de support (20) interagissant avec celle-ci sont définies en conséquence.
  11. Procédé selon la revendication 7 ou 8, caractérisé en ce qu'une enveloppe (26) est formée lors de la fabrication de la forme de réception (16) et un réducteur d'adhérence est disposé entre l'enveloppe (26) et une surface latérale (28) de la plaquette de support (20) de façon à réduire ou éviter le soudage à cet endroit.
  12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que la tête (14) est tenue dans un élément de réception (64) et la force, préférablement sous la forme d'un poussoir (82), est exercée sur une partie d'extrémité (32') du col (32) éloigné de la tête (14).
  13. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que le col (32) est tenu dans une partie d'extrémité (32') éloigné de la tête (14) au moyen d'un élément de réception (64) et la force, préférablement sous la forme d'un poussoir (82), est exercée sur la tête (14), préférablement approximativement en son milieu mesuré longitudinalement.
  14. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que le corps de brosse à dents (12) est tenu au moyen d'un élément de réception (64) dans une partie de manche (34) connectée au col (32) du côté éloigné de la tête (14) et la force, préférablement sous la forme d'un poussoir (82), est exercée sur la tête (14), préférablement approximativement en son milieu mesuré longitudinalement.
EP10000699.8A 2010-01-26 2010-01-26 Procédé de fabrication d'une brosse à dents et brosse à dents Not-in-force EP2347673B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP10000699.8A EP2347673B1 (fr) 2010-01-26 2010-01-26 Procédé de fabrication d'une brosse à dents et brosse à dents
PCT/EP2010/007797 WO2011091835A1 (fr) 2010-01-26 2010-12-20 Procédé de fabrication d'une brosse à dents et brosse à dents
EP10795628.6A EP2528472B1 (fr) 2010-01-26 2010-12-20 Brosse à dents
US13/520,438 US8840192B2 (en) 2010-01-26 2010-12-20 Method for producing a toothbrush and toothbrush

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10000699.8A EP2347673B1 (fr) 2010-01-26 2010-01-26 Procédé de fabrication d'une brosse à dents et brosse à dents

Publications (2)

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EP2347673A1 EP2347673A1 (fr) 2011-07-27
EP2347673B1 true EP2347673B1 (fr) 2015-08-05

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EP10000699.8A Not-in-force EP2347673B1 (fr) 2010-01-26 2010-01-26 Procédé de fabrication d'une brosse à dents et brosse à dents
EP10795628.6A Not-in-force EP2528472B1 (fr) 2010-01-26 2010-12-20 Brosse à dents

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EP10795628.6A Not-in-force EP2528472B1 (fr) 2010-01-26 2010-12-20 Brosse à dents

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WO (1) WO2011091835A1 (fr)

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Publication number Priority date Publication date Assignee Title
USD657569S1 (en) * 2010-02-26 2012-04-17 Colgate-Palmolive Company Head portion of an oral care implement
WO2012096701A1 (fr) * 2011-01-12 2012-07-19 Colgate-Palmolive Company Accessoire d'hygiène buccodentaire
US9538836B2 (en) 2011-01-12 2017-01-10 Colgate-Palmolive Company Oral care implement
EP2554353B1 (fr) * 2011-08-05 2017-06-07 Trisa Holding AG Procédé de fabrication d'une brosse à dents et brosse à dents
MX2014015837A (es) * 2012-06-20 2015-03-19 Colgate Palmolive Co Implemento para el cuidado oral y metodo de formacion del mismo.
USD765983S1 (en) 2013-12-16 2016-09-13 Colgate-Palmolive Company Toothbrush
USD753922S1 (en) 2013-12-16 2016-04-19 Colgate-Palmolive Company Toothbrush
USD765985S1 (en) 2013-12-16 2016-09-13 Colgate-Palmolive Company Toothbrush
USD765986S1 (en) 2013-12-16 2016-09-13 Colgate-Palmolive Company Toothbrush
USD764175S1 (en) 2013-12-16 2016-08-23 Colgate-Palmolive Company Toothbrush
USD765984S1 (en) 2013-12-16 2016-09-13 Colgate-Palmolive Company Toothbrush
USD760499S1 (en) 2013-12-16 2016-07-05 Colgate-Palmolive Company Toothbrush
USD764805S1 (en) 2013-12-16 2016-08-30 Colgate-Palmolive Company Toothbrush
MX2018012073A (es) 2016-04-20 2019-05-22 Trisa Holding Ag Producto para cepillar y metodo para su produccion.
CA182566S (en) 2017-03-22 2018-08-23 Gillette Co Llc Toothbrush
DE102019124307B3 (de) * 2019-09-10 2020-09-03 Gb Boucherie Nv Verfahren zum Befestigen einer Borste in einem Borstenträger sowie Vorrichtung hierfür

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JPS5620989Y2 (fr) * 1976-07-07 1981-05-18
DE20006311U1 (de) 2000-04-06 2001-08-09 G.B. Boucherie N.V., Izegem Vorrichtung zum Befestigen von mit Borstenbüscheln versehenen Plättchen an Bürstenkörpern
DE10164336A1 (de) 2001-12-28 2003-07-17 Trisa Holding Ag Triengen Zahnbürste und Verfahren zur Herstellung einer solchen Zahnbürste
DE10216641A1 (de) 2002-04-15 2003-10-23 Trisa Holding Ag Triengen Zahnbürste und Verfahren zu deren Herstellung
DE10259723A1 (de) * 2002-12-19 2004-07-01 Trisa Holding Ag Zahnbürste und Verfahren zu deren Herstellung
EP2263851B1 (fr) 2004-07-12 2016-08-10 Trisa Holding AG Procédé et dispositif pour produire une brosse à dents en moulage par injection bimatière ou multimatière et brosse à dents
EP2420157B1 (fr) 2010-08-18 2016-03-30 Trisa Holding AG Brosse à dents dotée d'une topographie particulière des soies

Also Published As

Publication number Publication date
WO2011091835A1 (fr) 2011-08-04
EP2347673A1 (fr) 2011-07-27
US20120284945A1 (en) 2012-11-15
EP2528472A1 (fr) 2012-12-05
EP2528472B1 (fr) 2016-02-10
US8840192B2 (en) 2014-09-23

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