EP3616895B1 - Method for producing draw string refuse bags formed from sheet material and draw string refuse bag formed from sheet material - Google Patents

Description

The invention relates to a method for manufacturing drawstring garbage bags from film material and drawstring garbage bags made of film material. The drawstring garbage bags can be used particularly in households or in commercial settings.

Drawstring garbage bags with an added fragrance are already known. During the manufacturing process, the fragrance is applied to the inside or outside of the bag's film. When the bag is opened, the fragrance releases a pleasant scent. This fragrance also serves to mask unpleasant odors emitted by the garbage inside. Such unpleasant odors can emanate particularly from partially or completely emptied food or beverage containers, or from leftover food.

The applicant has determined that fragrance compositions applied to the film material migrate through the film layers within a few days and distribute themselves relatively evenly across the drawstring garbage bags, which is advantageous for the release of the fragrances. Furthermore, the applicant has determined that the distribution of the fragrance composition onto the film material can dissolve printed ink. As a result, the ink transfers to the surface of the adjacent film layers. This creates a "reverse impression," i.e., a mirror image of the print on an originally unprinted area of the film material. The extent of the reverse impression depends on the composition of the fragrance composition, the amount applied, and the film thickness.

The US 2011/164834 A1 This describes a method for manufacturing drawstring garbage bags from film material, in which two drawstrings are inserted into the hems of a web of successive bags, with at least one of the drawstrings containing a fragrance composition. The fragrance is incorporated into the initial composition of the material from which the film material is extruded.

The US 2004/0016654 A1 This describes garbage bags whose drawstrings are scented. The scent is incorporated into the plastic for the drawstring before or during its extrusion.

The US 9,745,126 B1 This describes a drawstring bag which, in addition to the drawstrings in the upper hems of the bag, has scented ribbons inserted into further hems below, which are connected to the sides of the sidewall film. The upper hems have cutouts for pulling out the drawstrings, while the further hems do not have such cutouts.

Based on this, the invention aims to provide a method for producing drawstring garbage bags made of film material and providing drawstring garbage bags made of film material with a fragrance composition, whereby a residue no longer occurs or occurs to a reduced extent.

The problem is solved by a method having the features of claim 1. Advantageous embodiments of the method are specified in the dependent claims.

In the inventive method for producing drawstring garbage bags from film material, two drawstrings are inserted into the hems of a web of successive bags, wherein at least one of the drawstrings is provided with a fragrance composition, two separate first Film strips are fed in as pull tapes, the fragrance composition is applied to at least one of the first film strips, and the first two film strips are inserted into the hems as pull tapes.

In the drawstring garbage bags manufactured according to the invention, after a few days or weeks the fragrance composition spreads more or less evenly from the at least one drawstring through migration and diffusion into all areas and layers of the finished and rolled-up bags. The fragrance composition then no longer comes into contact with the printing ink (printing) on the bags at a critical concentration. Consequently, the printing ink does not dissolve, nor does the undesirable transfer occur. Transfer, however, occurs when the fragrance composition is applied directly to the film material of the bag, even if the fragrance composition is applied to areas of the film material on the inside that are not printed on the outside. In this case, the fragrance composition and printing ink come into contact through repeated folding of the web consisting of successive bags before it is rolled up into small consumer units, as they are separated from each other only by a single layer of film. In this case, the concentration is locally still high enough to dissolve the printing ink. This is not the case when the fragrance composition is applied to the drawstring, as several layers of film then separate the fragrance composition from the printing ink. Furthermore, it is advantageous that the film material of the bag is not printed in the hem area, so that even if the fragrance oil transfers to the adjacent films, no transfer can occur. The drawstring garbage bags are manufactured particularly efficiently by feeding two separate first film strips as drawstrings, applying the fragrance composition to at least one of the first film strips, and inserting the two first film strips into the hems as drawstrings.

According to a preferred embodiment of the invention, both drawstrings are provided with a fragrance composition.

According to another method, a wide first film strip is fed in, the two first film strips are formed by separating the wide first film strips, and these two first film strips are inserted into the hems as drawstrings. This facilitates the simultaneous insertion of the two first film strips into the hems.

According to another embodiment, the fragrance composition is applied to the wide first film web before cutting, or it is applied to at least one of the two first film webs after cutting. Applying the fragrance composition before cutting the wide first film webs reduces the application effort. Applying it after cutting reduces carryover of the fragrance composition.

In another embodiment, two halves of each first film layer are folded over each other around a fold line running lengthwise along the respective first film layer, and the folded first film layers form the two pull tabs. These multi-layered pull tabs are particularly strong and less prone to tearing. Applying the fragrance composition to the inner surfaces of the two halves can delay the release of the fragrance.

According to another embodiment, initial film webs are fed in, containing calcium carbonate or another absorbent substrate suitable for at least partially absorbing and releasing the fragrance composition in a delayed manner, and/or in which the fragrance composition is or contains a fragrance oil. This measure allows for further control of the fragrance release.

According to another embodiment, the fragrance composition comprises or is a mixture of fragrance oils (perfume substances). With this type of fragrance composition, the avoidance of runoff by the inventive method is particularly pronounced. According to a further embodiment, the fragrance composition consists of citrus terpenes, e.g., limonene.

According to another embodiment, the web is formed from successive bags made of at least one second film web. This is advantageous for efficient, high-speed production of the web from successive bags.

According to another embodiment, two halves of the continuous second film web are folded over each other around a bottom fold line oriented longitudinally along the second film web. According to another embodiment, the two hems are formed by folding over the outer edge areas of at least one of the second film webs. This is advantageous for the efficient, high-speed production of the web from successive bags.

In another embodiment, the two draw tapes are applied to the two halves of the second film web adjacent to the edge areas, and then the hems are formed by folding over the edge areas. This is advantageous for the efficient production of the web from successive bags at high speed.

According to another embodiment, the two halves of the second film web are welded together along side seams running perpendicular to its main direction of expansion and laterally limiting the bags, and/or are The folded hems along the hem seams running in the main direction of expansion of the second film layer are each welded to one half of the second film layer, and/or the two drawstrings on both sides of the bags are welded to the second film layer or to each other. The two drawstrings can either be welded into the weld seams or welded together in the first hem openings at the side edges of the bags. The same welding device can be used for welding the side seams and, if applicable, for welding the drawstrings together; for example, a device with heated metal welding bars. Hot air, a heated metal welding bar, heated metal rollers, or an ultrasonic welding device that runs on the second film layer can be used for welding the hem seams.

According to another embodiment, before applying the two drawstrings, initial hem openings are made in the edges of the second film sheet. These openings allow the drawstrings to be accessed from the outside after the hem is created, enabling them to be pulled out of the hems. Alternatively, before applying the two drawstrings, secondary hem openings are made in the edges of the second film sheet, allowing fragrances to escape. The ends of the drawstrings can be welded together in the initial hem openings. The initial and/or secondary hem openings can be created by punching into the edges of the second film sheet.

In another design, the web has perforation lines between adjacent bags, extending perpendicular to the main direction of expansion of the web. With this design, individual drawstring garbage bags can be separated from the web along the perforation lines.

According to another embodiment, the drawstring garbage bags are printed with printing ink on at least one outer surface. The invention prevents transfer of the printed drawstring garbage bags.

Alternatively, the garbage bags according to the invention are produced without a print. The fragrance composition on the at least one drawstring in the hem advantageously controls a gradual release of the fragrances during use of the garbage bags and prevents premature release of the fragrances before use. Furthermore, the arrangement of the fragrance-containing drawstring in the hem of the garbage bags prevents the fragrance composition from being carried over to subsequent parts of the production plant.

According to another embodiment, the fragrance composition is applied to and/or distributed on the pull cord by at least one of the following methods: spraying, dripping, rolling, printing, wiping, brushing.

According to another embodiment, predetermined lengths of the web are cut from successive drawstring garbage bags, wound into a roll, and the roll is packaged in an outer box. The outer box is, for example, a folding carton, a plastic film, or a band, preferably a paper band. The rolled-up web, consisting of numerous drawstring garbage bags, is then delivered to the consumer inside the outer box.

According to another embodiment, at least one first film layer is a plastic film layer and/or the second film layer is a plastic film layer. For the first film layer and/or the second film layer, for example, HDPE, LDPE, or a film layer made of biodegradable material, e.g., polylactic acid, special polyesters, or modified starch, is used.

Furthermore, the invention is solved by a drawstring garbage bag with the features of claim 12. Advantageous embodiments of the drawstring garbage bag are specified in the dependent claims.

The drawstring garbage bag made of film material according to the invention is manufactured according to a method according to one of claims 1 to 11.

The drawstring garbage bag exhibits the advantageous effects specified for the method of its manufacture. The following embodiments of the drawstring garbage bag exhibit the advantageous effects specified for the embodiments of the corresponding methods of its manufacture.

According to one embodiment of the invention, both drawstrings are provided with a fragrance composition.

According to one embodiment, the drawstring garbage bag comprises two side walls placed one above the other around a bottom fold line, each having a folded-over hem opposite the bottom fold line in which a drawstring is arranged.

According to another embodiment, the side walls are connected laterally by side seams extending perpendicular to the bottom fold and the hems, and/or each hem is connected to the same side wall via a hem seam at a distance from the hem fold over which it is connected to a side wall, and/or the ends of the drawstrings are connected to the side walls via the side seams or to each other via further side seams.

According to another design, the outside of at least one side wall is printed with printing ink.

According to another embodiment, the hems have at least one first hem opening in which at least one drawstring is exposed so that it can be pulled out of the hem, and/or the hems have at least one second hem opening from which fragrances can escape. The second hem opening can control the extent of the fragrance release.

In another embodiment, the pull cord contains calcium carbonate or another absorbent substrate suitable for at least partially absorbing the fragrance composition and releasing it gradually. This allows the release of the fragrance to be controlled.

According to another embodiment, a track consists of a plurality of successive and interconnected drawstring bags according to one of claims 12 to 15 and/or one of the aforementioned embodiments.

According to another design, the web has perforation lines extending perpendicular to its main direction of expansion between successive bags.

In another embodiment, the bag web is wound into a roll, and the roll is placed inside an outer packaging. In yet another embodiment, the outer packaging is a folding box or a plastic film.

In another version, the bags are made of plastic film and/or the drawstrings are made of plastic film. The plastic film is made, for example, of HDPE, LDPE, or biodegradable material such as polylactic acid, special polyesters, or modified starch.

Fig. 1

einen Zugband-Müllbeutel in der Vorderansicht:

Fig. 2

denselben Zugband-Müllbeutel in einem Schnitt entlang der Linie II-II;

Fig. 3

eine alternative Ausführung eines Zugband-Müllbeutels in einem der Fig. 2 entsprechenden Schnitt;

Fig. 4

eine Produktionsanlage zum Herstellen einer Bahn aus Zugband-Müllbeuteln in der Draufsicht;

Fig. 5

eine alternative Produktionsanlage zur Herstellung einer Bahn aus Zugband-Müllbeuteln in der Draufsicht.

The invention is explained below with reference to the accompanying drawings of exemplary embodiments. The drawings show:

Fig. 1

A drawstring garbage bag in front view:

Fig. 2

the same drawstring garbage bag in a cut along line II-II;

Fig. 3

an alternative design of a drawstring garbage bag in one of the Fig. 2 corresponding cut;

Fig. 4

A production plant for manufacturing a web of drawstring garbage bags in top view;

Fig. 5

An alternative production plant for manufacturing a web from drawstring garbage bags, shown in top view.

In the following explanation, identical features of different embodiments are provided with the same reference numerals.

According to Figs. 1 and 2 The drawstring garbage bag 1 has a bag 2 and two drawstrings 3, 4. The bag 2 has two overlapping side walls 5, 6, each with a folded hem 7, 8.

The side walls 5, 6 are laterally connected to each other by welded side seams 9, 10, which are oriented transversely to the hems 7, 8. Furthermore, the bag 2 has a bottom fold line 11 connecting the side walls 5, 6, which is arranged parallel to the hems 7, 8 at the opposite end of the bag 2. The hems 7, 8 are connected to the inner sides of the side walls 5, 6 by welded hem seams 12, 13. The hem seams 12, 13 run parallel to the bottom fold line 11.

A drawstring 3, 4 is arranged in each of the hems 7, 8. The drawstring 3, 4 can be elastic or inelastic. The ends of the drawstrings 3, 4 are welded into the side seams 9, 10.

Both hems 7, 8 have first hem openings 14, 15 in the middle, through which drawstrings 3, 4 are accessible from the outside.

Between the hems 7, 8, the bag 2 has an opening 16.

The side seams 9, 10 and the hem seams 12, 13 are produced, for example, by placing heated welding bars or heated rollers on the superimposed foils which form the side walls 5, 6 and the drawstrings 3, 4.

On the outside of a side wall 5, the bag 2 bears a print 17 made of printing ink.

Preferably, a web comprising a plurality of identical drawstring garbage bags 1, which are connected to each other along perforation lines 18 at the side seams 9, 10, is rolled up into a roll and packed in an outer packaging and placed on the market.

The pull cords 3, 4 are provided with a fragrance composition 19. Preferably, the fragrance composition 19 is applied to at least one side of the pull cords 3, 4:
Only a small amount of fragrance can escape from the roll, as the overlapping layers of film material prevent this. Because the pull tabs 3, 4 are coated with a fragrance composition 19, contact between the fragrance composition 19 and the printing inks of the imprint 17, and thus transfer of the imprint 17 to adjacent film materials, is prevented.

Individual drawstring garbage bags 1 can be unwound from the roll and separated along the perforation lines 18.

After individual drawstring garbage bags 1 are detached from the strip and the opening 16 is opened, a stronger fragrance is released. This can mask odors from waste.

According to Fig. 3 In an alternative design, the edge areas of the side walls 5, 6 are folded outwards and the hems 7, 8 are connected to the outer sides of the side walls 5, 6 via hem seams 12, 13.

According to Fig. 4 To produce a web 20 from a multitude of such drawstring garbage bags 1, a wide first film web 21 is fed from a drawstring roll 22. A fragrance composition 19 is applied to the wide first film web 21 by means of an application unit 23. This is then separated in a separating device 24 by means of a knife into two first film webs 25, 26, which are half as wide as the fed wide first film web 21. The two first film webs 25, 26 are folded and fed via deflections as drawstrings 3, 4 to a second film web 27.

The second film web 27 is a half-tube that is taken from a master roll 28. The half-tube comprises two halves that are folded against each other around a bottom fold line 11.

The second film web 27 is first fed to a punch 28, which punches first hem openings 31, 32 into both halves of the second film web 27 in the edge areas 29, 30.

Behind the punch 28, a first film web 25, 26 is fed to the edge areas 29, 30 of each half of the second film web 27 as a drawstring 3, 4. By folding over the edge areas 29, 30 of the halves of the second film web 27, hems 7, 8 are formed, which enclose the drawstrings 3, 4.

Subsequently, the hems 7, 8 next to the drawstrings 3, 4 are fixed by means of welded hem seams 12, 13, and side seams 9, 10 are welded perpendicular to the main expansion direction of the two film webs, which laterally define the bags 2. A perforation line 30 is made between each pair of adjacent side seams 9, 10 for separating individual bags 2.

The web 20 thus formed is divided into sections and the sections are wound into rolls and packed in outer packaging.

The production plant of Fig. 5 differs from the one described above in that the application unit 23 is arranged behind the separating device 24 and the fragrance composition 19 is applied after the wide first film web 21 has been separated into two first film webs 25, 26 with half the width and after these two film webs 25, 26 have been folded.

Claims (17)

1. A method for producing draw-string refuse bags (1) formed from sheet material, wherein two draw strings (3, 4) are introduced into hems (7, 8) of a web (20) of successive bags (2), wherein at least one of the draw strings (3, 4) is provided with a fragrance composition, two first sheet webs (25, 26) that are separated from one another are supplied as draw strings (3, 4) and the fragrance composition (19) is applied to at least one of the first sheet webs (25, 26) and the two first sheet webs (25, 26) are introduced into the hems (7, 8) as draw strings.
2. The method according to claim 1, wherein a broad first sheet web (21) is supplied, the two first sheet webs (25, 26) are formed by cutting apart the broad first sheet web (21), and the two first sheet webs (25, 26) are introduced into the hems (7, 8) as draw strings (3, 4).
3. The method according to claim 2, wherein the fragrance composition (19) is applied to the broad first sheet web (21) before the cutting or wherein the fragrance composition (19) is applied to at least one of the two first sheet webs (25, 26) after the cutting.
4. The method according to one of claims 1 to 3, wherein two halves of each first sheet web (25, 26) are folded one over the other about a fold line that is oriented in the longitudinal direction of the relevant first sheet web (25, 26) and the folded first sheet webs form the two draw strings (3, 4).
5. The method according to one of claims 1 to 4, wherein the first sheet webs (25, 26) contain calcium carbonate or another absorbent substrate that is suitable for absorbing at least some of the fragrance composition (19) and for releasing same in a delayed manner and/or wherein the fragrance composition (19) is or contains a fragrance oil.
6. The method according to one of claims 1 to 5, wherein the web (20) of successive bags (2) is formed from at least one second sheet web (27).
7. The method according to claim 6, comprising at least one of the following features:

   • two halves of the second sheet web (27) are folded one over the other about a base fold line (11) that is oriented in the longitudinal direction of the second sheet web (27),

   • the two hems (7, 8) are formed by folding over the outer edge regions (29, 30) of the at least one second sheet web (27),

   • the two draw strings (3, 4) are applied to the at least one second sheet web (27) so as to adjoin the edge regions (29, 30) and then the hems (7, 8) are formed by folding over the edge regions (29, 30),

   • the two halves of the second sheet web (27) are welded to one another along side seams (9, 10) that extend perpendicularly to the main extension direction of said second sheet web and that laterally delimit the bags (2) and/or the folded-over hems (7, 8) are welded to one half of the second sheet web (27) in each case along hem seams (12, 13) that extend in the main extension direction of the second sheet web (27) and/or the two draw strings (3, 4) are welded to the second side walls (5, 6) or to one another at the two sides of the bags (2),

   • before the two draw strings (3, 4) are applied, first hem openings (14, 15) are made in the edge regions (29, 30) of the second sheet web (27), in which seam openings the draw strings (3, 4) are exposed after the hems (7, 8) are formed, such that same can be pulled out of the hems (7, 8), and/or second hem openings (14, 15) are made in the edge regions (29, 30), from which hem openings fragrances can escape.
8. The method according to one of claims 1 to 7, wherein the web (20) has perforation lines (9) between neighboring bags (2) that extend perpendicularly to the main extension direction of the web (20).
9. The method according to one of claims 1 to 8, wherein printing ink is printed on at least one outer face of the draw-string refuse bag (1).
10. The method according to one of claims 1 to 9, wherein the fragrance composition (19) is applied to at least one of the first sheet webs (3, 4) and/or distributed thereon by means of at least one of the following methods: spraying, dripping, rolling, printing, wiping, brushing.
11. The method according to one of claims 1 to 10, wherein predefined lengths of the web (20) of bags (2) are cut off, wound into a roll, and packaged in outer packaging.
12. A draw-string refuse bag formed from sheet material produced according to a method according to one of claims 1 to 11.
13. The draw-string refuse bag according to claim 12, wherein the bag comprises two side walls (5, 6) that lie one on top of the other about a base fold line (11) and that each have a folded-over hem (7, 8) opposite the base fold line (11), in which hem one draw string (3, 4) is arranged in each case.
14. The draw-string refuse bag according to claim 13, wherein the side walls (5, 6) are interconnected at the sides by means of side seams (9, 10) that extend perpendicularly to the base fold line (11) and hems (7, 8) and/or wherein each hem (7, 8) is connected to the same side wall (5, 6) via a hem seam (12, 13) at a distance from the hem fold (11) via which said hem is connected to a side wall (5, 6), and/or wherein the ends of the draw strings (3, 4) are connected to the side walls (5, 6) via the side seams (9, 10) or to one another by means of further side seams.
15. The draw-string refuse bag according to one of claims 12 to 14, comprising at least one of the following features:

    • printing ink is printed on the outer face of at least one side wall (5) of the draw-string refuse bag,

    • the hems (7, 8) have at least one first hem opening (14, 15) in which at least one draw string (3, 4) is exposed, such that same can be pulled out of the first hem opening (14, 15), and/or the hems (7, 8) have at least one second hem opening from which fragrances can escape,

    • the draw strings (3, 4) contain calcium carbonate or another absorbent substrate that is suitable for absorbing at least some of the fragrance composition (19) and for releasing same in a delayed manner.
16. A web consisting of a plurality of successive draw-string refuse bags (1) according to one of claims 12 to 15.
17. The web according to claim 16, which has perforation lines (9) that extend between successive draw-string refuse bags (1) perpendicularly to the main extension direction thereof and/or which is rolled up and arranged in an outer packaging.