EP2030906A1 - Tubular bag and method for its manufacture - Google Patents

Abstract

The bag has a lower transverse welded seam (2) for locking a lower side of the bag to form a base, and an upper transverse welded seam (4) for locking a top side of the bag, which is formed from a covering material molded to a tube. A fastening button (9) and a clip project from main side surfaces (6) and an area (8) of one of the surfaces, and co-operate with a free longitudinal section of the tube, so that the opened tubular bag is relocked by a locking unit. The fastener fixes the longitudinal section opposite to the side surface and the area. An independent claim is also included for a method for manufacturing of a tubular bag.

Description

The present invention relates to a tubular bag, and a method for its production.

Today, tubular bags are used in particular for packaging foodstuffs. The tubular bags consist of an envelope, which has usually been formed into a tube via a longitudinal sealing seam. This hose is sealed at the bottom and at the top across, via a transverse weld. After forming one of the two welds, the product to be packaged is filled into the bag. Only then is the bag closed with the other transverse sealing seam.

In the partial removal of packaged goods from the tubular bag, there is a need to close the opened tubular bag. For this purpose, there are bands with inserted wire tendons that fix adjacent layers of the upper side closed tubular bag and thus can ensure the temporary closure of the tubular bag. As an alternative thereto, adhesive strips are known, which are arranged at the upper end of the tubular bag and over which the free end applied against a side surface of the tubular bag can be fixed. For this purpose, the adhesive strip is glued to the corresponding side surface.

The previously known solutions have various disadvantages. Thus, in the case of a bendable strip, there is the problem of feeding it to the tubular bag during the production of the filled tubular bag and fixing it temporarily. The attachment of an adhesive strip is complicated manufacturing technology. In addition, care must be taken that the adhesive strip is first sufficiently firmly attached to the material forming the tubular bag, but still relatively easy to solve by a user and also has sufficiently adhesive properties even after repeated opening of the temporarily sealed tubular bag.

The present invention is based on the problem of specifying a tubular bag which can be easily and reliably closed after first opening. Furthermore, the invention should provide a method for producing a corresponding tubular bag.

To solve the device-related problem, the present invention provides a tubular bag having the features of claim 1. The tubular bag according to the invention has a fastening means which is provided on the outside of the tubular bag this outstanding and which cooperates with the free length portion of the tubular bag to create the first opened tubular bag by folding the free length portion against the side surface and thus re-close.

The specific embodiment of the fastening means is formed according to preferred embodiments of the invention by a fastening button which can be passed through a passage which is recessed at the free length portion, so as to fix the applied to the longitudinal side of the bag length portion. In an alternative embodiment, a clip is provided which defines the free length portion relative to the side surface and thus allows the closure of the initially opened bag.

Thereafter, the tubular bag according to the invention offers the possibility of setting the free length section in a simple manner and in a form-fitting manner on the material of the wrapping material itself. Separate fasteners that have to be supplied to the tubular bag after manufacture of the tubular bag and fixed there are not required. The fastening means may be fixedly connected to the wrapping material as part of the tubular bag.

Unless the fastener is formed by the clip, no modifications to the bag are otherwise required. If the fastening means is formed by the fastening button, only one passage for the fastening button must be cut out on the free longitudinal section to be applied to the tubular bag. Additionally or alternatively, a cutout can also be formed by cutting away casing material, in particular by punching. This recess may have a dimension approximately corresponding to the size of the mounting head. The sheath may also have certain elastic properties to stretch elastically as the fastener button passes through the passageway. The fastening button is preferably carried by a neck tapered in relation to the size of the fastening button, which is surrounded by the passage after the tubular bag has been reclosed, so that the fastening button projects beyond the sleeve in the region of the free longitudinal section. The free length section is then substantially by a positive fit Fixed connection relative to the free length portion and held in closed alignment with the tubular bag.

According to one embodiment of the present invention, the recess is at least two sides projected beyond the slot. Accordingly, this recess has approximately a diameter corresponding to the diameter of the neck. The button is much bigger. As far as the dimensions of the neck on the one hand and the button on the other hand is mentioned below, this is to be understood in particular the dimension in a plan view of the side surface of the resealed tubular bag, against which the free length section is applied, d. H. the dimension of the corresponding component in a plan view of the bag approximately at right angles to the planar material of the Hüllstoffs in the region of the fastening knob.

The button should be designed in such a way that it fulfills two different functions in the best possible way: on the one hand, the button must be equipped at its free end so that the cover material can easily be pushed over the button in the area of the passage. For this purpose, a spherical or conical design of the fastening knob offers at its free end. The opposite side of the fastening button should prevent the other person from unintentionally bulging the Hüllstoffs possible. Thus, the hose bag facing the back of the fastener button form a flat contact surface for the envelope, which cooperates with the envelope surrounding the passage such that the contact surface prevents buckling of the Hüllstoffes in the region of the passage, or more difficult.

To maintain the substantially positive connection, it is furthermore preferable to provide the fastening-side end of the fastening means, ie the foot of the clip or the neck of the button, projecting inwardly into the bag. Accordingly, the wrapper tends to move away from this end. The wrapping material lies in the region of the side surface penetrated by the fastening button also in the region of the passage in a plane with the remaining wrapping material of the side surface. The neck and the dimensions of the fastening button should be coordinated with each other so that the envelope here rests against the rear abutment surface of the fastening knob, whereby bulging of Hüllstoffes outward in the region of the passage is largely avoided. A corresponding effect can also be achieved with a clip. It is essential in this embodiment, however, that the clip the free length section clamps and causes required elastic clamping forces, so that the free longitudinal section is clamped between opposing active surfaces of the clip and thus held.

To improve handling, it is proposed in another aspect of the present invention to arrange the fastening means on a fastening element, so that the fastening element projects centrally from this fastening means. The fastener should preferably have a concave surface connected by a fastener ring connected to the coverstock. This preferred embodiment is particularly suitable in combination with a fastener button as a fastener and improves the system the length of the fastener button .. The neck and the design of the fastener knob are coordinated so that the fastener button (with resealed bag) with his the bag bag facing Rear side abuts the flat film web of the free length section.

The said ring is preferably connected to the sheath by means of welding, preferably by means of ultrasonic welding, which leads to a high number of cycles in the production of tubular bags.

According to a further preferred embodiment of the present invention, the fastening means is connected to a degassing valve, which is fastened on the inside of the tubular bag to the wrapping material and serves to degas the bag. Such valves are commonplace in the manufacture of tubular bags for packaging goods that degas during storage (cf. EP 1 538 106 ). Accordingly, the development according to the invention offers the advantage of forming the valve with the device for reclosing the opened tubular bag as a unitary component. The valve and the fastening means can be attached to the wrapping material in one and the same manufacturing step.

To solve the procedural problem, the present invention provides a method for producing a tubular bag, in which a film web of Hüllstoffs to form a tube is placed around a form collar and the folded film web is formed by a longitudinal sealing device to a film tube, the top and bottom is closed after filling of goods to be packaged. Such a generic method is for example from the DE 33 45 459 , as well as the EP1 719 705 known. For the simple production of a resealable tubular bag is proposed with the present invention, on the film web a shell material protruding fastening button and at the same time to save a passage for the button. This passage is formed at a position which lies above the upper transverse weld after the upper and lower sides of the hose are closed. In this case, the invention can be guided by the idea that the fastening knob is fastened on that side of the sheet-like Hüllstoffes, which forms the inside of the later tubular bag. The fastening button itself protrudes on the opposite side of the Hüllstoffes. The fastening button is preferably connected via an ultrasonic device with the envelope, which is fixed to the envelope during welding. In a continuous deduction of Hüllstoff of a Hüllstoffvorrat the welding device is carried. In the same way should be carried a cutting and / or punching device to form the passage. This cutting or punching device and the welding device for fastening the fastening button can be provided on a common carriage. Accordingly, the welding device and the cutting or punching device can be moved simultaneously with the continuously withdrawn wrapping material.

Preferred developments of the tubular bag according to the invention are specified in the subclaims.

Figur 1

eine perspektivische Ansicht eines originalverschlossenen aufrechtstehenden Schlauchbeutels;

Figur 2

eine Längsschnittansicht entlang der Linie II-I gemäß der dargestellten Figur 1;

Figur 3

eine Ansicht gemäß Figur 1 eines wiederverschlossenen Schlauchbeutels;

Figur 4

eine perspektivische Ansicht eines wiederverschlossenen Beutels eines zwei- ten Ausführungsbeispiels der vorliegenden Erfindung und

Figur 5

eine Schnittansicht mit zwei alternativen Ausgestaltungen des Befestigungs- mittels ähnlich zu dem in Figur 4 gezeigten Ausführungsbeispiel.

The present invention will be explained in more detail below with reference to exemplary embodiments in conjunction with the drawing. In the drawing show:

FIG. 1

a perspective view of an original sealed upright tubular bag;

FIG. 2

a longitudinal sectional view taken along the line II-I according to the illustrated FIG. 1 ;

FIG. 3

a view according to FIG. 1 a resealed tubular bag;

FIG. 4

a perspective view of a resealed bag of a second embodiment of the present invention and

FIG. 5

a sectional view with two alternative embodiments of the fastening means similar to that in FIG. 4 shown embodiment.

The FIG. 1 shows a perspective side view of a marked with reference numeral 1 tubular bag, which is shown standing upright on a lower transverse weld 2. At the top four side edges run, 3 to an upper transverse weld 4 together. Through this upper transverse weld 4, the tubular bag 1 is closed on the upper side. The upper transverse weld seam 4 on the upper side is surmounted by a free longitudinal section 5.

The tubular bag 1 shown in the figures has two opposing main side surfaces 6 and two perpendicular thereto extending end faces 7. In the upper part of the tubular bag 1 results from the convergence of the side edges 3 to the upper transverse weld 4 a gable-shaped configuration of the end faces 7. The perpendicularly extending main side surfaces 6 are slightly bevelled relative to the lower portion. In about the middle of this chamfered portion 8 of one of the main side surfaces 6, the envelope of the tubular bag is surmounted by a fastening knob 9. In extension of this fastening knob 9 in the longitudinal direction of the tubular bag 1, the free longitudinal section 5 has a passage 10, which in the present case comprises a circular recess 11 whose diameter is smaller than a diameter D of the fastening knob 9 (see FIG. FIG. 2 ). The recess 11 has in the embodiment shown a diameter corresponding to about 60 to 80% of the diameter D. A slot 11 passing through the recess has a length L which corresponds to 1.2 to 1.5 times the diameter D.

As the illustration in FIG. 2 can be seen, the fastening knob 9 is located at the end of a neck 12, which protrudes from a concave surface 13 which is formed by a disk-shaped fastening element 14. This fastening element 14 has a fastening ring 15, which is welded to the inside of the enveloping material. Preferably, the fastener 14 also forms a valve for degassing the bag, so that the valve sometimes used together with the mounting button forms a structural unit. As a result, the manufacturing effort is reduced.

After the first opening of the bag by separating the upper transverse weld 4 and / or cutting in the upper side of the tubular bag 1 immediately below the upper Cross weld 4, the tubular bag 1 can be resealed. For this purpose, only the passage 10 must be placed on the fastening knob 9, so that the free length portion 5 is positively fixed relative to the tapered portion 8.

The present invention is not limited to the embodiment shown. Thus, a plurality of passageways 10 provided one above the other in the longitudinal direction can be provided on the free longitudinal section 5 in order to fix the multiply folded free length section 5 on the bevelled area 8 to improve the sealing via the fastening knob 5.

The FIG. 4 shows a perspective side view of an alternative embodiment of the in the FIGS. 1 to 3 shown in the re-closed position accordingly FIG. 3 of the previous embodiment. Identical components and elements of the tubular bag 1 are identified by the same reference numerals.

In the in the FIGS. 4 and 5 As shown in the embodiment shown, a clip 16 is provided as fastening means, which is connected to the middle of the chamfered region 8 of the main side surface 6 with the envelope of the tubular bag 1. This clip 16 has two legs, namely a lower leg 17, which is connected directly to the envelope of the tubular bag 1, and an upper leg 18, which rests under elastic bias against the lower leg 17 and re-closed tube bag 1, the free length section. 5 clamped against the lower leg 17.

As FIG. 5 can be seen, the clip 16 may rest with its lower leg 17 on the outside of the tapered portion 8. This variant is on the left side of the FIG. 5 shown. Alternatively, the clip 16 may also be integrally formed with a valve 19 as shown on the right side of FIG FIG. 5 is shown. The valve 19 has - as well as the valve according to the embodiment according to FIG. 2 - A ring 15 which spans a valve membrane 20. The clip 16 is integrally connected with its fastening side end with the mounting ring 15. The mounting ring 15 forms contact surfaces for the film material of the tubular bag 2, where this film material is welded to the mounting ring and thus to the clip 16, and gas-tight, so that the bag contents can escape through the valve membrane 20 alone.

LIST OF REFERENCE NUMBERS

1

tubular bag

2

lower transverse weld

3

side edges

4

upper transverse weld

5

free length section

6

Major side surface

7

Front side surface

8th

bevelled area

9

fastening button

10

passage

11

recess

12

neck

13

concave surface

14

fastener

15

fixing ring

16

clip

17

lower thigh

18

upper leg

19

degassing

20

valve membrane

Claims (14)

Tubular bag (1) formed from an envelope formed into a tube, which is closed to form a bottom with a lower weld (2) and the upper side with an upper transverse weld (4) is closed, of which a free length section (5) of the hose protrudes,
marked by
one of a side surface (6, 8) projecting fastening means (9; 16), which cooperates with the free longitudinal section (5) of the hose so that the initially opened tubular bag is reclosable by the closure means. Tubular bag according to claim 1, characterized in that the fastening means is a clip (16) which defines the free length portion relative to the side surface (6, 8). Tubular bag according to claim 2, characterized in that the clip (16) is glued to the outside of the tubular bag on this. Tubular bag according to claim 2, characterized in that the clip (16) is glued on the inside of the Hüllstoff and the side surface (6, 8) projects beyond the outside. Tubular bag according to claim 1, characterized by a fastening button (9) projecting from a side surface (6, 8) and formed by a passage (10) formed on the free longitudinal section (5) for securing the free longitudinal section (5) to the side surface (6) , 8) can be passed. Tubular bag according to claim 5, characterized in that the passage (10) comprises a slot which is formed by cutting the Hüllstoffs. Tubular bag (1) according to claim 5 or 6, characterized in that the passage (10) comprises a punched-out recess (11) which is smaller than the size of the fastening knob (9). Tubular bag (1) according to claim 7, characterized in that the recess (11) is surmounted on at least two sides of the slot. Tubular bag (1) according to one of claims 5 to 8, characterized in that the fastening button (9) is substantially spherical and is supported by a neck (12). Tubular bag (1) according to claim 9, characterized in that the fastening-side end of the neck (12) is provided projecting inwardly into the tubular bag (1). Tubular bag (1) according to one of the preceding claims, characterized in that the fastening means (9; 16) protrudes centrally from a fastening element (14) which has a concave surface (13) which is secured by a fastening ring (15) connected to the covering material. is surrounded. Tubular bag (1) according to claim 8, characterized in that the fastening ring (15) welded to the shell material, preferably ultrasonically welded. Tubular bag (1) according to one of the preceding claims, characterized in that the fastening means (9; 16) is connected to a degassing valve which is welded to the wrapping material on the inside of the bag and is held by the latter. A process for producing a tubular bag, in which a film web of a Hüllstoffs placed to form a tube around a form collar and the folded film web is formed by a longitudinal sealing device to a film tube which is closed on top and bottom after filling of goods to be packaged,
characterized,
in that on the film web a fastener button (9) projecting beyond the cover fabric and at the same time on the film web a passage (10) for the fastening button (9) is formed.

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