EP0635433B1 - Bag with press strip closure - Google Patents

Abstract

A bag, in particular made of plastic, has a press strip closure which consists of a female closure part and a male closure part, whose backs are connected (18, 17), preferably welded, to opposite walls (16, 19; 15) of the bag. In order that such a bag can be opened and closed easily and nevertheless counteracts an opening force exerted by a pressure of the contents located in the bag with great resistance, the connection (18) between the back of the female closure part and the bag wall (16, 19) begins at a point outside the centre of the female closure part and extends from there to the bag opening. <IMAGE>

Description

The invention relates to a bag according to the preamble of claim 1.

Such plastic bags are from US-A-4 817 188 and EP 0 398 732 A2.

So far, the slide fastener tapes for the aforementioned Bags mostly made of plastic polyethylene, which is relatively soft and flexible. It has already been tried been, instead of polyethylene a harder plastic like for example polypropylene for the slide fastener tapes too use. This would be desirable in itself, since it is a harder one Plastic also greater forces (with the same dimensions of the Slide lock) could be included. However, if you one of the known slide fastener tapes from a relative produces hard plastic such as polypropylene, difficulties arise. Closure tapes from one hard plastic such as polypropylene can only be extremely difficult to open and close, making it more practical Use is very tedious and difficult and not by customers is accepted. If you use the slide lock relatively creates large gaps between the hook elements in this way to achieve that the slide fastener tapes easier to open and close, this leads to the disadvantage that the slide fastener tapes are then too light from the inside open so that the slide fastener tapes separate from each other, when a force is exerted from the inside of the bag, what can always occur during normal use of the bag, for example if the bag falls, but also from others Establish. Even with only moderate pressure from the one in the bag Filling material bursts from the inside and that Product falls out.

In the known slide closures made of relatively soft plastic are the spaces between the hooks and bars relatively low to achieve good durability. With closures made of harder plastics such as polypropylene as mentioned above, these gaps need to be larger be the hook tips when opening and closing from the outside easy to decouple against each other, so the slide lock easy to open and close again. This has the disadvantage, however, that - as mentioned above - The required closing forces cannot be reached.

The object of the invention is to make a bag, preferably Plastic, with a slide lock of the type specified Art to create that can be opened and closed easily and which is still one by a pressure of the one in the bag The opening force exerted great resistance opposed.

According to the invention, this object is achieved by Features of claim 1 solved.

The connection between the back of the male fastener and the bag wall at a point in the area of Web of the hook of the male fastener begins, preferably in the middle of this web, and from there to the bag opening extends. The hook of the male fastener can also be called a single hook. He owns one Web, at the end of which a hook tip is provided. Through the described arrangement of the connection or welding between the back of the male closure part and the bag wall will, especially in cooperation with those already described Possibilities of connection or welding between the back of the female closure part and the bag wall, an offset or eccentric arrangement of the attachment points the wall of the bag reaches the fastener tape, which leads to the advantages mentioned.

The connection or welding ends between the back of the female and / or male fastener before (within) the outer end of each Back. This means that the connection or welding between the back of the female and / or male fastener ends at a point that is inside the outer End of the associated back lies. This will have the effect the displacement or the effect of the eccentricity of the arrangement the connection points or welding points of the bag walls to the fastener tape and thus the associated Leverage or torque generation increased.

Due to the design on which the invention is based it is possible to make the fastener tape from a relative hard plastic such as polypropylene. It is also possible to change the spaces between the Execute hook elements relatively large, so that the Closure can be opened and closed easily, while doing so at the same time a sufficient resistance against one inadvertent opening of the bag due to pressure from the inside guarantee.

The invention provides a slide fastener tape that from a relatively hard plastic (i.e. a plastic, which is harder than polyethylene, e.g. made of polypropylene) is made that is easy to open and light can be closed and still has a very long shelf life from the inside has that the pressure of the filling material from the inside opposed great resistance without opening. The slide fastener tape can be made very small and narrow.

This is achieved through the offset or eccentric arrangement the points of attachment of the bag walls to the fastener tape, So the places where the back of each Closure part connected or welded to the bag wall is. With an eccentric attachment of these connection points or weld seams that connect the bag wall to the closure, If the product is pulled from the inside, there is a torque, which causes the hook tips to intensely interlock claw. If vice versa when opening the fastener parts or the bag walls located in the area of the bag opening is pulled, the hook tips come apart slightly. They twist in such a way that they disengage from each other will.

Advantageous developments of the invention are in the subclaims described.

It is advantageous if the connection between the back of the female closure part and the bag wall in the area of outer hook or web of the female closure part begins. This connection preferably begins at the interior of the female closure part facing side of the web this hook, that is, the hook of the female profile that is on the side facing the bag opening or on the inside of the bag opposite side.

The wall of the bag preferably projects beyond the back of the female and / or male closure part. The bag wall is accordingly towards the outside, i.e. on the inside of the bag opposite side of the closure, longer than the one or the Back of the closure part or parts. This allows those Parts of the bag wall, which protrude beyond the closure parts, gripped will. If you then the seized bag walls pulls apart, the closure is opened.

According to a further advantageous development, the hook has (Single hook) of the male closure part on the tip of its hook facing away from a bulge. This bulge can have the shape of a back of the head. Your purpose is there in supporting the opposite hook tip. The transition point between the bulge or the back of the head and the adjoining web of the single hook forms an abutment for the hook tip of the opposite hook of the female Closure part. This hook tip is practically supported as an abutment against the aforementioned transition point and remains the indentation formed by it. This makes it reliable prevents the lock from opening to the outside directed pressure inside the bag opens unintentionally. If the closure should be opened at will, the Hook tip slightly from the indentation.

It is advantageous if the hook backs on the inside and / or outside, approaches, preferably short approaches. These approaches are in the interest of good handling the closure attached. They can be relatively short be.

The height of the hooks is preferably two to three times as large like the strength of the webs of the hooks. The webs are therefore proportionate executed thin.

It is also advantageous if the ratio of the length of the Hook tips to the thickness of the webs is 0.4 to 1. The Hook tips are therefore preferably made to be relatively long.

Fig. 1

ein Verschlußband in einer Seitenansicht,

Fig. 2

das in Fig. 1 dargestellte Verschlußband mit kürzeren Ansätzen,

Fig. 3

einen Beutel mit einem Verschlußband in einer Seitenansicht und

Fig. 4

den in Fig. 3 dargestellten Beutel in einer perspektivischen Ansicht.

An embodiment of the invention is described below with reference to the accompanying drawings. In the drawing shows

Fig. 1

a fastening tape in a side view,

Fig. 2

the fastener tape shown in Fig. 1 with shorter approaches,

Fig. 3

a bag with a fastener tape in a side view and

Fig. 4

the bag shown in Fig. 3 in a perspective view.

At the upper end of a bag 19 made of plastic is a slide fastener tape attached that from a male fastener 1 and a female closure part 2. Every fastener has a back 3, 4 with the wall 19 of the bag connected, namely welded. It is understood that the fastening of the closure parts on the bag wall also through Glue or another suitable type of attachment or connection can be done.

The backs 3, 4 of the closure parts 1, 2 are opposite Connected walls 16, 19 and 15 of the bag, respectively by welds 17, 18. The male fastener 1 has a hook (single hook) 6, which is perpendicular to the back 3 protrudes. The single hook 6 in turn consists of a web and a hook tip 7. The bridge connects the Hook back 3 to the hook tip 7.

The female closure part 2 consists of a hook back 4 and two hooks 9, 10, which in turn each consist of a web and each consist of a hook tip 11, 12. The hook tips are facing each other. They limit one between themselves Interior in which the single hook 6 can be hooked.

The connection or welding 18 between the back 4 of the female closure part 2 and the bag wall 16, 19 begins at a location outside the center of the female closure member 2. It extends from there to the bag opening, in 3 and 4 upwards. The lower end of the weld 18 lies above the center of the female closure part 2. This middle of the female closure part 2 is on half way between the webs of the hooks 9, 10.

3 and 4, the lower one is located End of the weld 18, that is, the point at which this weld 18 begins in the area of the outer hook 9 of the female Closure part 2, namely on the interior of the female Closure part 2 facing side of the web of this hook 9.

The weld seam 17 between the back 3 of the male closure part 1 and the bag wall 15 begins at one point in the area of the web of the single hook 6, in the middle this bridge. The weld seam 17 extends from there to Bag opening to the outside.

As can be seen from FIGS. 3 and 4, the bag walls protrude 16, 15 the backs 4, 3 of the female closure part 2 and the male closure part 1. To the side of the bag opening the bag walls 16, 15 are therefore longer than the hook backs 4, 3. Furthermore, the weld seam 18 ends before the outer End of the back 4 of the female closure part 2. In a similar way The weld seam 17 ends before the outer end of the back 3 of the male closure part 1. This allows the outer Ends of the bag walls 16, 17 opposite the outside Ends of the backs 4, 3 bent in the manner shown in Fig. 4 will. The outer ends of the bag walls 16, 15 can gripped by hand and pulled apart.

The single hook 6 of the male closure part 1 points to the a bulge 8 on its side facing away from the hook tip 7. The bulge has the appearance of a rounded back of the head. At the transition point from the bulge 8 to the web of the single hook 6, an indentation is formed in which the Hook tip 11 of the opposite hook 9 of the female Closure part 2 can get stuck (see in particular Fig. 3).

The hook backs 4, 3 have on their inner and outer sides approaches 13, 14 and 2, 1 respectively. These are preferably approaches relatively short. It handles the closure improved. The approaches can also be longer, as shown in Fig. 1 by approaches 1 and 2. In which 2, the approaches 1, 2 are shortened.

The handling of the plastic bag and the associated sealing tape is as follows: if the fastener tape is hooked, the hook tip 11 of the hook 9 is supported, that is to say the outer one Hook of the female profile part 2, in the manner of an abutment against the rounded back of the single hook 6. The The hook tip 11 sticks to the indentation of the hook 9, that at the transition point from the web of the hook 9 to the bulge 8 is formed. This shows in FIG. 3 Guaranteed reliable hooking, if the contents inside the bag follow you externally acting train or pressure generated by the arrows 20, 21, 22, 23 is shown. External pressure forces in the Inside the bag create the outward forces 22, 23, which in turn have tensile forces 20, 21 in the bag walls let arise. Due to the offset (eccentric) arrangement the fastening points (welding points) of the bag walls a torque is generated on the fastener tapes causes the hook tip 7 of the hook 6 and the hook tip 12 of the hook 10 claw together intensively. Here it comes in particular to the lower ends of the welds 17, 18, since there the tensile forces of the bag wall 19 in the Closure tapes are initiated. By the described Arrangement of the lower start of the weld seams 17, 18 is a Torque to the fastener tapes 1, 2 generated, which this brings in the position shown in Fig. 3, in which the Hook tip 11 with the indentation between the indentation 8 and the web of the single hook 6 claws.

Nevertheless, the slide lock can be simple and reliable be opened if desired. The over the hook back 3, 4 projecting ends 15, 16 of the bag wall gripped and in the direction of the opposite arrows 24, 25 pulled apart. Then the hook tip 11 comes off completely easily from the indentation between the bulge 8 and the Web of the single hook 6, while the single hook 6 is still turns further and turns from the hook 10, i.e. from the lower (inner) Hook of the female closure part 2, completely uncoupled (see Fig. 4).

The easy closing of the closure results in the relatively spacious formed by the hooks 9 and 10, single-groove of female closure part 2, through which the single hook 6 Snap on easily but clearly audibly and tangibly leaves.

The weld seam 17 below the single hook 6 starts approximately in the middle of the web of this hook 6 and extends approximately 1 to 2 mm in the upward or outward direction, i.e. in that direction Direction facing away from the hook tip 7. The hook tip 7 of the single hook 6 is directed towards the inside of the container.

The weld seam 18 sets approximately below the inside of the web of the upper (outer) hook 9 and extends also about 1 to 2 mm towards the bag opening. This displacement of the fastening seams 17, 18 creates this Torque, which can be seen from Fig. 3.

The closure band consisting of two closure parts (band halves) 1, 2 can also have shorter approaches 1, 2, as in FIG. 2 shown, since the weld seams 17, 18 only part of this Cover approaches. In the interest of better handling of the closure however, the approaches must be in place. Also the Approaches 13, 14 must be available; they are significantly shorter than approaches 1, 2.

The staggered are of particular importance for the invention (Eccentric) arrangement of the attachment points of the bag walls to the fastener tape, the special design of the back of the head 8 of the hook 6, the relatively thin webs and long tips of the hooks 6, 9, 10, the short lugs 13, 14 (as well as approaches 1, 2) for better handling and the big ones Gaps between the hooks and bars.

In the drawing figures, the closure parts 1, 2 and their Back hooks 3, 4 and their hooks 6, 9, 10 disproportionately shown large. In a preferred embodiment of the fastener tape the following dimensions can be provided:

The hooks 6, 9, 10 are about 0.9 to 1.0 mm high. The hook backs (Bases) 3, 4 are about 0.3 to 0.4 mm thick. The bridges the hooks 9, 10 are about 0.3 to 0.4 mm thick. The jetty of the single hook 6 can be somewhat stronger, that is 0.4 to 0.5 mm. The interior of the female fastener part, through the hook 9, 10 is formed, should be about 1.1 to these proportions 1.3 mm wide, the hook tips 11, 12 a length of have about 0.2 to 0.3 mm, so that then the distance between the hook tips 11, 12 of the female profile part about 0.6 to Is 0.7 mm. The hook tip of the male profile part 6 stands about 0.3 mm beyond the web 6 in this case. This relatively large distances are necessary so that the relatively rigid, inflexible hook bars when opening and closing only have to bend aside a little.

From the dimensions mentioned it follows that the height of the hooks is preferred is two to three times the strength of theirs Ridges that the ratio of the length of the hook tips to that Thickness of the webs is preferably 0.4 to 1 and that the spaces between the hooks 9, 10; 6 and webs preferably about half the thickness of the webs.

Claims (7)

1. Bag, in particular made of plastic, having a press-strip closure which comprises a female closure part (2) and a male closure part (1), of which the spines (4, 3) are connected (18, 17), preferably welded, to opposite walls (16, 19; 15) of the bag, the connection (18) between the spine (4) of the female closure part (2) and the bag wall (16, 19) starting at a location outside the centre of the female closure part (2) and extending from there to the bag opening, characterized in that the connection (17) between the spine (3) of the male closure part (1) and the bag wall (15) starts at a location in the region of the web of the hook (6) of the male closure part (1), preferably in the centre of this web, and extends from there to the bag opening, and in that the connection (18, 17) between the spine (4, 3) of the female and/or male closure part (2, 1) and the associated bag wall (16, 15) terminates before the outer end of the respective spine (4, 3).
2. Bag according to Claim 1, characterized in that the connection (18) between the spine (4) of the female closure part (2) and the bag wall (16, 19) starts in the region of the outer hook (9) or web of the female closure part (2), preferably on that side of the web of said hook (9) which is directed towards the interior of the female closure part.
3. Bag according to either of Claims 1 and 2, characterized in that the bag wall (16, 15) projects beyond the spine (4, 3) of the female and/or male closure part (2, 1).
4. Bag according to one of the preceding claims, characterized in that, on the side which is directed away from a hook tip (7), the hook (6) of the male closure part (1) has a convexity (8), which is in the form of the back of a head.
5. Bag according to one of the preceding claims, characterized in that, on their insides and/or outsides, the hook spines (4, 3) have extensions (13, 14; 2, 1), preferably short extensions.
6. Bag according to one of the preceding claims, characterized in that the vertical dimension of the hooks (9, 10; 6) is two to three times the thickness of the hook webs.
7. Bag according to one of the preceding claims, characterized in that the ratio of the length of the hook tips (11, 12; 7) to the thickness of the web is 0.4 to 1.

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