EP1623644A2 - Slide fastener, slide fastener band and reclosable bag - Google Patents

Abstract

The press seal strip for bags has one section (4) with grooves (9, 10) at the bases of hooks (13, 15). This cooperates with a second section (2), also with hooks (19, 21). Sloping strips on the first section support the second section. One of these (16) is attached to a hook (15), while the other (11) is attached to the edge of a groove (9). An independent claim is included for resealable bags fitted with the press seal strip.

Description

The invention relates to a pressure closure, in particular a pressure sealing strip, preferably made of plastic. It further relates to a resealable bag, in particular a resealable packaging bag, or a resealable package or other resealable container, preferably made of plastic, with a pressure closure or a pressure seal tape.

For the reclosability of bags and packaging a variety of pressure caps and pressure sealing tapes are already known. These are usually pressure-sealing tapes, which are extruded endlessly and consist of two strands. The two strands are usually equipped with two or more hooks, which mesh with each other. In another type of pressure-sealing tapes, one strand has a hooked groove, while the other strand engages with a dart-like hook in the groove. Such an embodiment known from US 2003/0077008 A1 is shown in FIG. The one-piece production of the pressure seals or the pressure closure tapes with the bags or packaging is known.

Attached in the bag openings, these closures are opened by pulling on the so-called grip flaps and closed by pressing or lengthening with thumb and forefinger.

However, the prior art closures have the disadvantage that the groove and hook tip or hook and double hook, i. the two closure strands must come to lie exactly overlapping one another in order to then be pressed into one another, which is usually very difficult for the user and often fails. The bags or packages then remain open and the contents spoil or become dusty or are exposed to other negative environmental influences.

Especially in food packaging, where these closures are increasingly used, this disadvantage is particularly disturbing, but should be closed after partial withdrawals of the remaining remainder and protected. The closing of these closures is particularly complicated by the fact that the grooves and hooks are very small and it often fails to bring them precisely engaged. To close properly, it requires some skill and good eyesight.

In single households usually only small portions are consumed and therefore partial withdrawals desired. There one particularly prefers a reclosure option. On the other hand, these single households are very often inhabited by older people who have not only lost in skill, but also see worse and then often can not cope with the complicated closing.

In order to meet the much-needed demands of the advertising and packaging industries for convenience to consumers, in the field of resealable bags and packages, a variety of closure bags are provided with a slider, particularly of plastic, offered on the top of the bag or the packaging. Although these packages are by simple back and forth easy to open and close the slider for the consumer. But they have the disadvantage that their production is very expensive and technically very expensive. Another disadvantage is that the pushers increase the volume of the stacked bags considerably, which requires more packaging.

From EP 1 431 203 A1 a press fastener and a pressure fastener tape with a groove part, which has a groove, and an engagement part, which has an engagement element, are known. The groove part further has funnel-shaped webs and inwardly facing projections. The projections may form part of the groove. This is to ensure that when closing the pressure lock, the engagement element can safely enter the groove, in particular even if the engagement element and the groove are initially not exactly positioned correctly to each other.

The object of the invention is to propose an improved pressure seal, an improved pressure seal tape and an improved resealable bag.

After a first proposal, this object is solved by the features of claim 1. The pressure seal comprises a groove portion having at least two grooves and an engagement portion having one or more engagement elements. Preferably, an inwardly facing projection is present in each groove. One or more or all engagement elements may also have inwardly facing projections. According to the invention it is provided that the groove part has funnel-shaped webs. In this way, it can be reliably ensured that when the pressure closure is closed, the engagement elements also reliably enter the groove when the engagement elements and the grooves are initially not exactly correctly positioned relative to one another. By the invention, the reliability of the pressure closure is significantly improved.

In use, groove part and engaging part can diverge more or less for various reasons, so no longer aligned to lie one above the other in a line. This can be done easily, in particular, when the container or bag equipped with the pressure-sealing tape is still partly filled, or when the container or bag is handled clumsily. Even in these cases, the inventively provided, funnel-shaped webs ensure that when pressing the pressure closure, the groove portion is captured as it were from the engaging part and the correct closure takes place.

The groove part and / or the engagement part are preferably made of plastic, in particular of polyethylene or polypropylene. Preferably, the entire pressure seal or the entire pressure sealing strip made of plastic, in particular one of the said plastics. The fastener tape or parts thereof can also be made coextruded.

Advantageous developments are described in the subclaims.

A funnel-shaped web may point obliquely outward from an inward-facing protrusion. Preferably, the length of this funnel-shaped web from its end to the projection at least one and a half times, in particular at least twice as large as the distance of the projection from the base of the groove.

Preferably, a funnel-shaped web from the bottom of a groove obliquely outwards.

According to a further advantageous embodiment, the groove part on lateral support webs for supporting the funnel-shaped webs. The lateral support webs are preferably provided on both sides of the funnel-shaped webs. When winding the pressure seal tape on coils there is a risk that the funnel-shaped webs are pressed so that they flatten and that they later not enough upright anymore. This can be prevented by the buttresses.

Preferably, an inwardly facing projection is provided for each of the grooves. The grooves are preferably adjacent. The engagement member is preferably designed accordingly, thus preferably has two engagement parts. The inventively sized webs serve as "tentacles". This development has the advantage that the pressure closure, in particular because of the projections of the grooves, which are preferably designed hook-shaped, can also be made liquid-tight.

The problem underlying the invention is further solved by the features of claim 6. The pressure seal or the pressure closure strip, which are preferably made of plastic, comprises at least one groove part having a groove part and at least one engaging member having an engagement part. The groove part has funnel-shaped webs and inwardly facing projections. According to the invention, the groove part also has lateral support webs for supporting the funnel-shaped webs. By the funnel-shaped webs can be reliably ensured that when closing the pressure lock, the engagement element also safely enters the groove when the engagement member and the groove are not yet positioned correctly to each other. The lateral support webs are preferably provided on both sides of the funnel-shaped webs. When winding the pressure seal tape on coils there is a risk that the funnel-shaped webs are pressed so that they lay flat and that they do not straighten up enough later. This can be prevented by the buttresses.

Advantageous developments are described in the subclaims.

Preferably, the length of at least one web from its end to the projection is at least one and a half times as large, in particular at least twice as great as the distance of the projection from the base of the groove. Through so long sized bars, the reliability of the pressure closure can be significantly improved.

The inwardly pointing, preferably hook-shaped projections of the groove part can be arranged offset. The engagement member may equally staggered projections, which are preferably also designed hook-shaped. In this way, the advantage can be achieved that both the engagement of the engaging part in the groove part and the opening by pulling on the handle rims is additionally facilitated.

The projections may be elongate, hook-shaped and / or tapered.

The engagement element may be arrow-shaped.

The engagement element may be symmetrical. However, it is also possible to form the engagement element asymmetrically. In this case, preferably, the side of the container facing the edge of the preferably arrow-shaped engagement element is formed longer than the edge of the container opening facing edge. In a corresponding manner, the groove or its inwardly directed projections may be formed asymmetrically. Preferably, the inwardly facing projection, which lies on the side of the groove facing the container interior, is formed longer than the opposite projection. As a result of the asymmetrical design of the engagement element and / or the groove, unintentional opening of the container from inside in particular can be better prevented.

The engagement part and / or the groove part may have stiffeners, which stiffeners may be directed inwards and / or outwards. It is advantageous if the stiffeners are present on both sides of the groove part or of the engagement part, preferably at the same distance from it.

A further advantageous development is characterized in that the groove part in the region of the base of the groove has a thickness which allows a slight deflection of the webs. The thickness of the base of the groove is preferably dimensioned such that the webs for a sufficiently easily deflected and on the other hand have a sufficient closing force.

The groove part and / or the engagement part can be connected to one or more flags.

The flags may be present on the side of the pressure cap which faces the container opening. You can make handles there. Instead or in addition, flags may also be present on the side of the pressure closure which faces the container interior. These flags can form fastening flags.

The groove part and / or the engagement part may be integral with the flags. The flags can be connected to the base of the groove part. However, it is also possible that the flags are connected to the groove part at another location, preferably in the region of the projections.

A further advantageous development is characterized in that one or more flags are coextruded with the pressure closure.

The resealable bag according to the invention or the resealable packaging according to the invention, which are preferably made of plastic, preferably of polyethylene or polypropylene, is characterized by a pressure seal according to the invention or a pressure-sealing tape according to the invention. The resealable bag and resealable package and the pressure closure may be integral. In many applications, however, it is advantageous if the resealable bag or the resealable packaging on the one hand and the pressure closure On the other hand, the pressure-sealing tape is produced in multiple pieces and connected to one another, preferably by welding and / or gluing.

Fig. 1

eine erste Ausführungsform der Erfindung mit einem Nutteil, das zwei Nuten aufweist, in einer Seitenansicht,

Fig. 2

eine Abwandlung der Ausführungsform gemäß Fig. 1 in einer Seitenansicht,

Fig. 3

einen vorbekannten Druckverschluß in einem Querschnitt

Fig. 4

eine zweite Ausführungsform der Erfindung mit einem eine Nut aufweisenden Nutteil, das seitliche Stützstege aufweist,

Fig. 5

einen wiederverschließbaren Beutel mit einem Druckverschluß gemäß Fig. 4 in einer Seitenansicht,

Fig. 6

eine Abwandlung des Druckverschlusses gemäß Fig. 4 und 5 in einer Seitenansicht,

Fig. 7

eine weitere Abwandlung des Druckverschlusses gemäß Fig. 4 bis 6 während des Schließvorgangs und

Fig. 8

eine weitere Abwandlung des Druckverschlusses gemäß Fig. 4 bis 7.

Embodiments of the invention are explained below with reference to the accompanying drawings in detail. In the drawing shows

Fig. 1

a first embodiment of the invention with a groove part, which has two grooves, in a side view,

Fig. 2

a modification of the embodiment of FIG. 1 in a side view,

Fig. 3

a prior art pressure seal in a cross section

Fig. 4

a second embodiment of the invention with a groove portion having a groove portion having lateral support webs,

Fig. 5

a resealable bag with a pressure closure according to FIG. 4 in a side view,

Fig. 6

a modification of the pressure closure according to FIGS. 4 and 5 in a side view,

Fig. 7

a further modification of the pressure closure of FIG. 4 to 6 during the closing process and

Fig. 8

a further modification of the pressure closure of FIG. 4 to 7.

Fig. 1 shows a resealable bag 1 made of plastic and a pressure sealing strip 2 made of plastic. With the rear wall 3 of the bag 1 is a groove part. 4 connected, namely welded along a line 5. With the front wall 6 of the bag, an engagement part 7 is connected, namely welded along a line 8.

The groove part 4 has two grooves 9, 10 which are adjacent to each other. The first groove 9 is bounded by a funnel-shaped web 11 and a web 12, which has an inwardly facing projection 13. The second groove 10 is bounded by the web 12 and another web 14 having an inwardly facing projection 15. From the inwardly facing projection 15, another funnel-shaped web 16 obliquely outwards.

The engagement member 17 comprises an engagement member 18 having at its end to an inwardly facing projection 19 which engages in the closed position of the pressure closure shown in Fig. 1, the inwardly facing projection 13 of the web 12, so that the projections 19 and 13 are hooked together in the manner shown in FIG.

The engagement member 7 further includes a further engagement member 20 which also has at its outer end a hook-shaped projection 21 which engages behind the hook-shaped projection 15 of the web 14.

The groove part 4 has on the rear wall 3 of the bag 1 side facing a flag 22. On the opposite side, the groove part 4 also has a lug 23, at the outer ends downwards or outwardly facing stiffeners 24, 25 are provided.

The engagement part 7 has on the front wall 6 of the bag 1 side facing a flag 26. On the opposite side, the engagement part 7 also has a lug 27 which is longer than the lug 26 and which has reinforcements 28, 29 on its outer sides.

The base 30 of the groove part 4 has a greater thickness than the lugs 22, 23. In a corresponding manner, the base 31 of the engagement part 7 has a greater thickness than the flags 26 and 27th

In the area between the base 30 and the lugs 22 and 23 in the groove part 4 outwardly facing stiffeners 32, 33 are provided. In a corresponding manner, the engagement part 7 in the region between the base 31 and the flags 26, 27 outwardly facing stiffeners 34, 35.

The outer tabs 23 and 27 form handle flaps for opening the pressure closure. The lugs 23, 27 can be grasped and pulled apart in the region of the stiffeners 24, 25, 28, 29, whereby the pressure closure can be opened.

The angle which the funnel-shaped webs 11, 16 enclose is about 60 °. It is preferably in the range between 30 ° and 90 °. The funnel-shaped webs 11, 16 form a funnel-shaped extension to the engagement part 7.

The engagement elements 18, 20 have thickenings 37, 38 in the region of the base 31. In order to additionally stabilize the relatively long webs of the engagement elements 18, 20, they have bilateral thickenings 39, 40 in their middle, which are mounted at a distance from the stiffeners 37, 38.

The groove part 4 has lateral support webs 41, 42. The lateral support bar 41 protrudes from the flag 23 obliquely upwards. Its upper end is located on the outside of the funnel-shaped web 11, and slightly above the center of the funnel-shaped web 11. In a corresponding manner, the lateral support web 42 projects from the flag 22 obliquely upwards. Its upper end abuts the funnel-shaped web 16. The lateral support webs 41, 42 each originate from a lug 23, 22, from which they point upwards at an angle of approximately 30 ° to the vertical. The supporting pillars 41, 42 are intended to prevent the tips of the funnel-shaped webs 11, 16 from being wound up during the winding of the pressure-sealing strip on rollers during production, turn around, stay in this position later and lose their function as a funnel-shaped catcher of the engaging part 7 partially. The lateral support webs 41, 42 rest on the funnel-shaped webs 11, 16 or terminate at the smallest possible distance from these funnel-shaped webs 11, 16.

The hook-shaped projection 19 is rounded. As a result, the opening of the pressure closure can be facilitated. If the lugs 23, 27 are pulled outward, the hook-shaped projection 19 can be easily passed by the opposite hook-shaped projection 13.

Fig. 2 shows a modified embodiment in which the hook-shaped projection 19 is not rounded. As a result, a higher density is achieved. The base 30 of the groove part 4 is welded by welds 43, 44 with the rear wall 3 of the bag 1. In a corresponding manner, the base 31 of the engagement part 7 is connected to the front wall 6 of the bag 1 by a weld 45.

The length A of the funnel-shaped ridge 16 from its end to the projection 15 is more than one and a half times as large as the distance B of the projection 15 from the base 30 of the groove part 4. Thus, the relationship A ≥ 1.5 x B applies.

The pressure closures according to FIGS. 1 and 2 are liquid-tight closures, which nevertheless are easy to close. The funnel-shaped webs 11, 16 each have a straight sealing edge 46, 47 which abut against the undersides of the flags 26, 27 and thus additionally act sealingly. The hook-shaped projections 13, 15, 19, 21 can be formed depending on the requirements of the tightness with good opening and closing ability. If the requirements for the tightness are not so high, individual or all hook-shaped projections can be rounded, as for example in Fig. 1, in which the hook-shaped projection 19 is rounded, so that the closure can be easily opened and still sufficient tightness is ensured, in particular by the hook-shaped projections 15 and 21. If the requirements are higher in the tightness, none of the hook-shaped projections is rounded, as shown in Fig. 2.

Fig. 3 shows a prior art embodiment with an engagement member 48 which is formed arrow-shaped. The tip of the arrow faces the groove 49. It is slightly rounded.

4 shows an embodiment with a groove part 4, which has a groove 49, and an engagement part 7, which has an engagement element 50. The engagement element 50 is formed arrow-shaped. The tip of the arrow faces the groove 49. When closed, the tip of the arrow lies in the groove 49.

The groove part 4 has funnel-shaped webs 51, 52 which point obliquely upward from the base 53 of the groove 49. Their starting points from the base 53 are at a distance from each other. The angle between the funnel-shaped webs 51, 52 is about 60 °. It is preferably in the range between 30 ° and 90 °. The funnel-shaped webs 51, 52 form a funnel-shaped extension to the engagement member 50 back.

The groove part 4 further comprises inwardly facing projections 54, 55 which face inwardly from the funnel-shaped webs 51, 52, respectively. Their starting point lies below the center of the funnel-shaped webs 51, 52. As can be seen from FIG. 4, the length A of the funnel-shaped webs 51, 52 from their end to the protrusions 54, 55 is more than one and a half times the distance B. the projections 54, 55 from the base 53 of the groove 49. Thus, the relationship A ≥ 1.5 x B applies.

The projections 54, 55 close with the funnel-shaped webs 51, 52 an angle of about 45 °, said angle may also be larger or smaller, and preferably in the range between 30 ° and 60 °. As can be seen in FIG. 4, the projections 54, 55 extend slightly towards the base 53 of the groove 49. They form a barb for the engagement element 50.

The groove part 4 and the engagement part 7 are, like the embodiment of FIGS. 1 and 2, provided with flags, which are connected on the one hand to the walls of the bag and on the other hand handle grips form to open the pressure closure.

The projections 54, 55 are hook-shaped. The distance between the mutually facing ends of the projections 54, 55 is greater than the width of the web of the engagement member 50, so that the tip of the engagement member 50 engage behind the hook-shaped projections 54, 55 in the closed position shown in Fig. 4.

The flags of the groove part 4 are connected to the funnel-shaped webs in the region of the hook-shaped projections 54, 55. The base 53 of the groove part 4 is outside the plane of the flags.

The groove part 4 has abutments 56, 57, which are configured as in the embodiment of FIG. 1. Each of their upper ends abuts the outer sides of the funnel-shaped projections 51, 52, approximately at half the height of the funnel-shaped projections 51, 52. The angle of the lateral support webs to the vertical is approximately 30 °, as shown in Fig. 5 can be seen.

As can be seen from FIG. 5, the outer lugs 58, 59 form handle lugs, which are connected to one another by a U-shaped end piece 60. In the region of the end piece 60 perforations 61 are provided in both lugs 58, 59, in the vicinity of the U-shaped end piece 60. Between the pressure seal and the perforations 61, the flags 58, 59 by a so-called "peel-seal" 62nd connected, so by a resinous peelable plastic material that can be coextruded. This peelable material forms a tamper evidence.

To open the container, the U-shaped end piece 60 is first separated along the line-shaped perforations 61. The tabs 58, 59 which form the handle tabs are gripped and pulled apart so that the connection caused by the adhesive resin 62 is released.

In the embodiment according to FIG. 6, the lugs of the groove part are mounted directly on the left and right of the base 53 of the groove 49. The base 49 has a thickening, which is provided on the side facing away from the groove 49 of the flags. A corresponding thickening is provided in the region of the engagement part 7 on the side facing away from the groove part 4 of the flags.

In the embodiments of FIGS. 7 and 8, the hook projections 54, 55 are each formed differently. In the embodiment of FIG. 8, the hook-shaped projections 54, 55 are also arranged offset in height beyond.

As can be seen from FIGS. 7 and 8, the outer hook 54 lying on the side of the groove facing the outer side of the container is thinner, shorter and sharper than the inner hook-shaped projection 55, which is longer on the side of the groove 49 facing the container interior ,

Fig. 7 demonstrates the operation of the funnel-shaped webs 51, 52 as tentacles. Even if the closure strips are not correctly aligned or aligned, catch the funnel-shaped webs 51, 52 as tentacles the engaging part 7 and lead it to the groove 49 of the groove part 4 to.

Fig. 8 shows another embodiment. Here, the inwardly facing projections 54, 55 of the groove part 4 are arranged offset. They are at different distances from the base 53 of the groove 49. In a corresponding manner, the hook-shaped projections of the engaging part are offset in height. By the embodiment of FIG. 8, an even easier closing of the closure is made possible.

The production of the closure strips and / or the containers or packages according to the invention are not limited to the plastics polyethylene and polypropylene. They can be made of all known plastics, or parts of them can be coextruded with such plastics.

Claims (7)

Pressure seal, in particular pressure seal tape, preferably made of plastic, having at least one groove portion (4) having a groove, the funnel-shaped webs (11, 12) and inwardly directed projections (14, 15), and at least one engaging member having engaging member (7) .
characterized,
that the length (A) at least one web (11, 12, 47) from its end up to the projection (14, 15, 56) is at least one and a half times as large as the distance (B) of the projection (14, 15, 56 ) from the base (13) of the groove (5, 61). A press fastener according to claim 1, characterized in that the length (A) of the web (11, 12, 47) from its end to the projection (14, 15, 56) is at least twice as large as the distance (B) of the web Projection (14, 15, 56) from the base (13) of the groove (5, 61). A pressure closure according to claim 1 or 2, characterized in that the inwardly directed projections are arranged offset. A pressure closure according to one of the preceding claims, characterized in that the groove part (4) comprises supporting pillars (42, 43) for supporting the funnel-shaped webs (11, 12). Press fastener according to one of the preceding claims, characterized in that the groove part (44) has two grooves (60, 61). A press fastener according to claim 5, characterized in that an inwardly facing projection (55, 56) is provided for each of the grooves (60, 61). Resealable bag or resealable package, preferably made of plastic, characterized by a pressure closure or a pressure closure tape according to one of claims 1 to 6.

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