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WO2004000527A1 - Procede et dispositif de fabrication de pieces moulees par injection, en particulier de brosses a dents et de corps de brosses a dents - Google Patents

Procede et dispositif de fabrication de pieces moulees par injection, en particulier de brosses a dents et de corps de brosses a dents Download PDF

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Publication number
WO2004000527A1
WO2004000527A1 PCT/EP2002/012644 EP0212644W WO2004000527A1 WO 2004000527 A1 WO2004000527 A1 WO 2004000527A1 EP 0212644 W EP0212644 W EP 0212644W WO 2004000527 A1 WO2004000527 A1 WO 2004000527A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection
conveying
additive
piston
molding compound
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.)
Ceased
Application number
PCT/EP2002/012644
Other languages
German (de)
English (en)
Inventor
Götz GARDLO
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.)
Braun GmbH
Original Assignee
Braun GmbH
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 Braun GmbH filed Critical Braun GmbH
Priority to AU2002351986A priority Critical patent/AU2002351986A1/en
Publication of WO2004000527A1 publication Critical patent/WO2004000527A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
    • B29C45/1816—Feeding auxiliary material, e.g. colouring material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C2045/1784—Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
    • B29C2045/1785—Movement of a part, e.g. opening or closing movement of the mould, generating fluid pressure in a built-in fluid pressure generator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
    • B29C45/1816—Feeding auxiliary material, e.g. colouring material
    • B29C2045/185—Feeding auxiliary material, e.g. colouring material controlling the amount of auxiliary material

Definitions

  • the present invention relates to a method and a device for producing injection molded parts, in particular toothbrushes or toothbrush bodies.
  • WO 00/40389 A1 describes an injection molding machine for producing molded parts, in particular toothbrushes, the injection molding machine having an injection molding tool and an injection unit with a screw-type piston extruder or similar conveying device.
  • Distribution channels lead from the injection unit to the individual mold cavities.
  • One or more are attached to the distribution channels or the mold cavities
  • the supply 'of the additive thereby comprises a supply conduit, a pump and a storage vessel for the additive.
  • the pump is designed as an independent feed and metering pump.
  • the additive is dosed continuously or intermittently.
  • a disadvantage of the prior art described is that there are restrictions on the addition of additives in the conventional processes.
  • the described processes there are restrictions when one or more additives are added to a molding material stream in such a way that separate molding material partial streams with different properties are formed at the same time due to the additives. This is currently often only achieved by a corresponding multiplication of the injection units and their upstream and downstream devices.
  • the present invention is therefore based on the technical object of providing an improved method and an improved device for metering additives in plastic injection molding, which avoid the disadvantages of the prior art.
  • the aim is to create an improved dosing option for additives that is simple and inexpensive.
  • One advantage of the method and the device according to the invention is that conventional compound or masterbatch processing can be replaced thereby. Furthermore, the invention simplifies the change of additives in the production process, since only areas of the molding compound control system have to be rinsed.
  • the invention can be used to process thermally sensitive additives more gently by adding them to the molding composition as close as possible to the cavity. In addition, shear-sensitive additives can be used on a processing screw be directed past. Finally, injection molded products with different material properties can be produced simultaneously with the injection of only one base material.
  • Liquid paint, granulate, powder, metal platelets, reinforcing materials, mold release agents, blowing agents, plasticizers, hardeners or others are suitable as additives.
  • the method according to the invention does not require any complex regulation, since the metering takes place through direct coupling to the movement of the injection unit cylinder.
  • the ratios of the material flows from injection cycle to injection cycle are reproducible.
  • the time course of the ratio of the material flows, i.e. of the molding material flow and the additive (s) volume flow ⁇ / volume flows, are determined in advance.
  • the method according to the invention is particularly suitable for coloring plastics during the injection molding process.
  • undyed plastic material can be used as the molding compound.
  • a suitable flowable color concentrate can serve as an additive.
  • An advantageous embodiment of the method according to the invention provides the features of claim 2. This means that when changing from one additive to the next, i.e. from one production cycle to the next, the desired ratio of molding compound / additive can be set.
  • a device according to the invention for plastic injection molding has the features of patent claim 3.
  • V'addition (t) is proportional to the relative amount when molding material is conveyed .
  • the screw in conjunction with the non-return valve, acts as a displacement piston in the same way as the injection piston in a piston injection molding machine. Therefore, the term injection piston is used in the following in a simplified and summarized manner for both variants.
  • the device according to the invention uses the piston movement of the injection unit in order to promote and around an additive volume flow V ' ZUsa tz (t) at the same time to achieve a determinable and reproducible ratio between V ' additive (t) and the molding material volume flow V' F r r mass (t).
  • a single-acting fluid cylinder the housing and piston rod of which are articulated directly or indirectly to the cylinder and bearing block, can use the piston movement of the injection unit to serve as a conveying movement for additives.
  • an additive volume flow V ' salting (t) can be conveyed from a corresponding storage container to one or more metering points.
  • at least one inlet and one outlet line must be provided, each of which has at least one backflow valve, as is the rule for piston pump systems.
  • the addition of the additive to the molding material flow takes place from the discharge line of the feed cylinder for additives via a metering line, which can be designed as a pipe or hose system.
  • the metering can take place at one or more arbitrary points in the molding compound control system, where the volume flows are combined.
  • the device according to the invention can also be arranged several times, as a result of which several additives can be conveyed synchronously separately from one another. These can be admixed to individual partial flows of the molding compound which have previously been divided. For example, in the case of a multiple injection mold, individual cavities or groups of cavities can be sprayed in different colors without the need for a separate injection unit and a separate molding compound control system for each color.
  • An advantageous embodiment of the device according to the invention provides the features of claim 4.
  • the coupling can advantageously take place either according to the features of claim 5, for example by means of a rigid lever connection, or according to the features of claim 6, for example via a lever system with a variable lever ratio.
  • a further advantageous embodiment of the device according to the invention provides the features of claim 7.
  • a first hydraulic cylinder for generating a hydraulic pressure and a second hydraulic cylinder for actuating the delivery cylinder are provided, the ratio of piston cross-sectional area to piston rod cross-sectional area being the same in both hydraulic cylinders. This is the prerequisite so that the hydraulic system is not blocked.
  • Particularly advantageous with this Embodiment is that the delivery cylinder and the injection unit are spatially decoupled from one another.
  • the delivery cylinder is indirectly coupled to the injection unit by means of wedge surfaces.
  • the volume ratio q ratio between additive volume flow and molding material volume flow depends on the wedge angle apart from the piston cross sections.
  • Figure 1 is a schematic detailed view of a first advantageous embodiment of the present invention in section.
  • Figure 2 is a schematic detailed view of a second advantageous embodiment of the present invention in section.
  • FIG. 3 shows a schematic detailed view of a third advantageous embodiment of the present invention in section
  • 4a, 4b a schematic view of an injection unit in two working states.
  • FIGS. 4a and 4b show two states of motion of an injection unit 34.
  • the volume flow volume V ' F ⁇ r m mass (t) comes about through a linear relative movement of injection pistons (injection screw) 31, coupled to the bearing block 7 and injection unit cylinder 9.
  • the injection screw 31 has a non-return valve 32 with a cross-sectional area A F ⁇ .
  • the volume of the flow of molding compound 33 can be calculated as follows:
  • a horizontally arranged feed cylinder 2 for additives has a piston 4, which is concentrically accommodated therein and is connected at one end to a piston rod 5.
  • the left end of the delivery cylinder 2 in the illustration is directly connected to an injection unit cylinder 9 (only partially shown) via a joint bearing 8.
  • the piston rod 5 is connected at the right end in the illustration to a bearing block 7 (likewise only partially shown) via an articulated bearing 6.
  • the feed cylinder 2 for additives is connected via a reservoir line 11 and a check valve 12 to a reservoir 3 for additives.
  • the check valve 12 opens and the additive in the storage container 3 can flow into the delivery cylinder.
  • the feed cylinder 2 is also connected to a metering line 14 via a check valve 13 with a metering point, not shown.
  • the check valve 13 is closed during the filling process of the feed cylinder 2. In contrast, during the metering process, i. H. If the piston 4 in FIG. 1 moves from the right to the left in the feed cylinder 2, the check valve 13 opens and the additive can thus reach the metering point via the metering line 14.
  • the longitudinal axis 29 of the delivery cylinder 2 is arranged parallel to the longitudinal axis 30 of the piston rod 10 of the injection unit cylinder 9.
  • the axis of movement of the piston 4 of the delivery cylinder 2 is parallel to the axis of movement of the injection piston (not shown) of the injection unit cylinder 9. Therefore, the piston 4 executes the same relative movement as the injection piston in this exemplary embodiment.
  • FIG. 2 shows a schematic detailed view of a second advantageous embodiment of a device for conveying and metering additives 1 in section.
  • This instructs horizontally arranged delivery cylinder 2 on a piston 4, which is connected at one end to a piston rod 5.
  • the left end of the delivery cylinder 2 in the illustration is directly connected to an injection unit cylinder 9 (only partially shown) via a joint bearing 8.
  • the piston rod 5 has at its right end in the illustration a joint 17 which is connected to a rocker arm 19.
  • the rocker arm 19 has a total length l 2 and an upper lever length ⁇ , which is measured between the joint 17 and another joint 18.
  • the rocker arm 19 is tilted by an angle ⁇ to the vertical 27.
  • the lower end of the rocker arm is connected to a plunger 15 via a joint 16.
  • the plunger 15 is in turn connected at its second end via a joint 6 to the bearing block 7, which is only partially shown.
  • the feed cylinder 2 for additives is connected via a reservoir line 11 and a check valve 12 to a reservoir 3 for additives.
  • the feed cylinder 2 is connected to a metering line 14 via a check valve 13 with a metering point, not shown.
  • the coupling of the delivery piston 4 with the injection unit cylinder 9 and the bearing block 7 thus takes place indirectly in the exemplary embodiment according to FIG. 2 via a rocker arm system.
  • the metering ratio q can be adjusted by changing the lever arm ratio ⁇ 2 with unchanged piston surfaces of the delivery piston 4 and the injection unit piston.
  • ⁇ For small swivel angles ⁇ of the rocker arm 19, q is approximately constant during the conveying process.
  • FIG. 3 shows a schematic detailed view of a third advantageous embodiment of a device for conveying and dosing additives 1 in section.
  • a horizontally arranged first hydraulic cylinder 22 has a piston 21, which is accommodated concentrically therein and is connected at one end to a piston rod 20.
  • the left end of the first hydraulic cylinder 22 in the illustration is connected to an injection unit cylinder 9, which is only partially shown, via a joint bearing 23.
  • the piston rod 20 of the first hydraulic cylinder 22 is connected at its right end to a bearing block 7 via an articulated bearing 6. Decoupled spatially from the injection unit and the first hydraulic cylinder 22, a feed cylinder 2 for additives with a feed piston 4 is arranged.
  • the delivery piston 4 is connected at one end to a piston rod 5 which simultaneously forms the piston rod of a second hydraulic cylinder 26 and is connected to the hydraulic piston 28 thereof.
  • the second hydraulic cylinder 26 serves as a working cylinder and is supplied with hydraulic fluid from the first hydraulic cylinder 22 via the first pressure line 24 and the second pressure line 25.
  • the feed cylinder 2 is connected via a reservoir line 11 and a check valve 12 to a reservoir 3 and also via a metering line 14 and a check valve 13 to a metering point, not shown.
  • the embodiment according to FIG. 3 represents a double-acting first hydraulic cylinder 22 mechanically coupled to the injection unit for generating a hydraulic pressure.
  • the actual delivery cylinder 2 for additives is driven spatially separately by means of a second hydraulic cylinder 26 via the hydraulic pressure generated by the first hydraulic cylinder 22.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

Procédé de fabrication de pièces moulées par injection, en particulier de brosses à dents ou de corps de brosses à dents, comportant les étapes suivantes : transport de matière à mouler d'un récipient de stockage via une unité de moulage par injection dans les espaces creux d'un moule de moulage par injection, transport d'un ou plusieurs additifs en synchronisme avec le transport de la matière à mouler et dosage de l'additif qui est alors introduit dans le flux de matière à mouler. La présente invention concerne encore un dispositif de fabrication de pièces moulées par injection, en particulier de brosses à dents ou de corps de brosses à dents, qui comporte une unité de moulage par injection (34) destinée au transport d'une matière à mouler, en particulier une extrudeuse à vis sans fin ou un dispositif de transport analogue, et des canaux d'alimentation (14) permettant de doser au moins un additif et de l'introduire dans le flux de matière à mouler. Ce dispositif est caractérisé en ce qu'il comporte des dispositifs de transport de l'additif en synchronisme avec le transport de la matière à mouler à travers l'unité de moulage par injection et des dispositifs de dosage de l'additif et d'introduction de ce dernier dans le flux de matière à mouler. L'avantage du procédé et du dispositif selon la présente invention est qu'ils permettent de remplacer le traitement classique sur la base du mélange ou du mélange-maître. En outre, grâce à la présente invention, le changement d'additif dans le processus de production est simplifié du fait que seules certaines zones du système de transport de la matière à mouler doivent être nettoyées.
PCT/EP2002/012644 2002-06-19 2002-11-13 Procede et dispositif de fabrication de pieces moulees par injection, en particulier de brosses a dents et de corps de brosses a dents Ceased WO2004000527A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002351986A AU2002351986A1 (en) 2002-06-19 2002-11-13 Method and device for producing injection-molded parts during an injection molding method, particularly toothbrushes or toothbrush bodies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10227260 2002-06-19
DE10227260.3 2002-06-19

Publications (1)

Publication Number Publication Date
WO2004000527A1 true WO2004000527A1 (fr) 2003-12-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/012644 Ceased WO2004000527A1 (fr) 2002-06-19 2002-11-13 Procede et dispositif de fabrication de pieces moulees par injection, en particulier de brosses a dents et de corps de brosses a dents

Country Status (2)

Country Link
AU (1) AU2002351986A1 (fr)
WO (1) WO2004000527A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006026555A2 (fr) 2004-08-30 2006-03-09 Seo Hong Yoo Effet neuroprotecteur d'udca solubilise dans un modele ischemique focal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430033A (en) * 1941-11-12 1947-11-04 French Oil Mill Machinery Method of molding resins
US5225210A (en) * 1991-10-18 1993-07-06 Sysko Corporation Colored resin molder
EP0623445A1 (fr) * 1993-05-06 1994-11-09 KLÖCKNER DESMA SCHUHMASCHINEN GmbH Unité d'injection pour des machines à mouler par injection pour fabriquer des articles en matière thermoplastique
DE29622660U1 (de) * 1996-05-20 1997-03-27 Klöckner Desma Schuhmaschinen GmbH, 28832 Achim Spritzeinheit an Spritzgießmaschinen zur Herstellung thermoplastischer Kunststoffteile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430033A (en) * 1941-11-12 1947-11-04 French Oil Mill Machinery Method of molding resins
US5225210A (en) * 1991-10-18 1993-07-06 Sysko Corporation Colored resin molder
EP0623445A1 (fr) * 1993-05-06 1994-11-09 KLÖCKNER DESMA SCHUHMASCHINEN GmbH Unité d'injection pour des machines à mouler par injection pour fabriquer des articles en matière thermoplastique
DE29622660U1 (de) * 1996-05-20 1997-03-27 Klöckner Desma Schuhmaschinen GmbH, 28832 Achim Spritzeinheit an Spritzgießmaschinen zur Herstellung thermoplastischer Kunststoffteile

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MENGES G ET AL: "VERNETZBARKEIT THERMOPLASTISCHER SCHMELZEN BEIM SPRITZGIESSEN", PLASTVERARBEITER, ZEHNER AND HUETHIG VERLAG, SPEYER AM RHEIN, DE, vol. 21, no. 5, May 1970 (1970-05-01), pages 1 - 11, XP002042604, ISSN: 0032-1338 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006026555A2 (fr) 2004-08-30 2006-03-09 Seo Hong Yoo Effet neuroprotecteur d'udca solubilise dans un modele ischemique focal

Also Published As

Publication number Publication date
AU2002351986A1 (en) 2004-01-06

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