KR930001030B1 - Method of forming a reclosable container with grip strip - Google Patents

Abstract

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Description

Reclosable bag with gripping strip

1 is a perspective view of a reclosable bag with an improved gripping strip of the present invention.

FIG. 2 is a side view of the bag of FIG. 1 partially cut to show the gripping strip on the inner side of one lip. FIG.

3 is a partial plan view of an extrusion die used to extrude a ridge forming a gripping strip on the rib of the bag shown in FIG.

4 is a partially enlarged plan view of the lower protrusion of the die plate shown in FIG.

5 is an enlarged cross-sectional view of a grip lip having a single ridge typically used in the prior art.

FIG. 6 is a view similar to FIG. 5 showing only one gripping strip having multiple ridges formed and manufactured using the die plate of FIG. 3 in accordance with the principles of the present invention.

7A-7E are cross-sectional views of various embodiments of gripping strips in accordance with the present invention showing some variations in ridge spacing, shape and size.

8d is an enlarged cross-sectional view of the ridge of FIG. 7d.

FIG. 8E is an enlarged cross-sectional view of the ridge of FIG. 7E.

* Explanation of symbols for main parts of the drawings

10: bag 16, 18: lip

20,21: Gripping strip 22,24,43: Ridge

30: cut portion 41: gripping projection

The present invention relates to a reclosable bag with a gripping strip.

Reclosable plastic bags or other containers, in particular bags comprising a zippered reclosable container described in US Pat. No. 4,263,079, where the bag is generally positioned on the bag and gripped between the thumb and the other finger. Pulling it has a rib that opens the bag. The turret is combined relatively tightly so that it does not accidentally open and requires some force to open it. Such bags are often used in kitchens and are generally slippery in the hands of those who use them. Since the ribs of the bag are formed of a smooth film, such as a film formed of a polyolefin resin, the ribs of the bag easily interlock with each other, but are difficult to hold while pulling them open when the human hand is slippery. To address this problem of rip gripping, attempts have been made to have one, two or three large ribs with dimensions close to the dimensions of the bag element, as described in US Pat. No. 4,363,345. These large ribs are intended to allow the user to easily grip the container while opening the container and containing the contents therein. However, it has been found that the use of large ribs can cause undulations during extrusion due to their size and the formation method is complicated. In addition, large ribs are inconvenient to use in various aspects, such as requiring a little effort by the user, and when one or two or more large ribs are used, a large amount of resin material is required.

The inventors of the most preferred and improved configuration, the size and number of the projections should be used to simply roughen the surface as a non-blocking clearance means, and the ribs are large and numbered to facilitate gripping the lip of the reclosable plastic bag. Learned that it should be less.

The present invention provides an improved reclosable plastic container that allows for easy gripping of the lip of the bag in terms of location and gripping performance, while also providing a container having improved gripping properties, hereinafter referred to as a gripping strip. This improvement provides for the reclosable lip of the bag to have a large number of small ridges in parallel on the opposing surface of the bag to provide a large ridge area to grasp the top or lip of the bag when opening the bag and loading the contents therein. It is obtained by deforming. In addition, the use of multiple ridges can result in significantly smaller ridges and a better gripping surface than when a single rib is used. Moreover, many smaller ridges are easier to manufacture than fewer large ribs. When the small ridge is added to the film by extrusion, only a small change in the die is required. Also, small ridges can be made by methods other than extrusion, such as embossing, and many small ridges can reinforce the ribs of the bag. An advantage of the present invention is that a series of substantially parallel ridges provide grip projections, with a height of 0.015 to 0.229 mm (0.002 to 0.009 inches), preferably 0.076 to 0.127 mm (0.003 to 0.005 inches) and a reclosable bag. By spacing at about 7 to 24 (preferably 12 to 16) ridge densities per 2.54 cm (1 inch) of the film.

The present invention will be described in detail with reference to the accompanying drawings. 1 shows a bulk lip having opposing sidewalls 12 and 13, a reclosable fastening element 14 and gripping strips 20 and 21, respectively, for easy opening and grasping of the bag when the contents are contained in the bag. A container or bag 10 with 16, 18 is shown. FIG. 2 is a cross-sectional view of the inner side of the bag 10 with a lip 16 and a gripping strip 20 in a cross-sectional view similar to FIG. 1, wherein the gripping strip is from one edge 15 to the other edge 17. It has a plurality of elongated ridges 22 that are generally parallel as strips or bands over the lip 16 over the reclosable fastening element 14 which extends into the. The ridge is preferably continuous along its length.

The bag 10 has a cut 30 of a die 29 for a gripping strip ridge 22 located outside the extrusion hole 31 of each profile extrusion as shown in part in FIG. It may be formed in the manner shown and described in 4,515,647. The cut 30 at the front or lower edge of the die 29 forms a toothed die protrusion 32 that is somewhat exaggerated in size for clarity. The cut 30 forming the ridge 22 of the gripping strip 20 is triangular to provide a generally triangular ridge 22, as shown, for example, in FIG.

In the enlarged view of FIG. 4, the land 34 between the cuts 30 is no greater than the distance x between the peaks 23 of the adjacent ridges 22. Also, as in the gripping strip 20 of FIG. 6, the draw down between the cuts 30 when compared to the cuts 30 of the die 29 due to the draw down that occurs in the extrusion process of forming the ridge 22. Land 34 extends to the distance x minus the width w of ridge 22. The space | interval between the ridges 22 by the drawdown in the extrusion process, and the specific shape of each ridge 22 are mentioned later. The cut portion 30 may deform the shape close to the rectangle into another shape, that is, in the form of a sawtooth or an isosceles triangle such as a right triangle. During the extrusion process, a slight rounding occurs in the draw down, so that the gripping strips 20, as in the gripping protrusions 41 of the 8d degree ridge 22 and the gripping protrusion 42 of the 8d degree ridge 43, become slightly rounded. It is preferred that the shape has at least one protrusion that can be engaged by a thumb or other finger when holding the lip to open the sacks including.

5 shows a prior art gripping lip 35 having a film having a thickness t of 0.05 to 0.08 mm and a gripping lip having a height h of 0.5 to 1.3 mm. There is usually only one or two ribs 36 in one grip lip.

In the cross-sectional view of the gripping strip shown in FIG. 6, the film thickness t is similar to that of FIG. 5 with 0.05 to 0.08 mm, but the ridge height is 0.05 to 0.23 mm and the thickness of the film over the width w of the gripping strip is 2.54 cm ( With about 12 to 16 ridge densities per inch, the spacing x between the peaks 23 of adjacent ridges 22 is 1.5 to 2.0 mm (0.06 to 0.08 inch).

Various modifications of the invention are shown in FIGS. 7A-7E, all of which are shown with the same accumulation (50 times the actual size) as used in FIGS. 5 and 6. All of these examples are feasible (the examples of FIGS. 7B and 7E were actually manufactured), but the best of these are the examples of FIG. 7D. (7) of FIG. 7A, (12) of FIG. 7B, (24) of FIG. 7C, (16) of FIG. 7D and (20) of FIG. 7E represent ridges 22 per inch (2.54 cm) of the gripping strip, or The number of ridges 43 is shown. The number of ridges is about 7 to 24 (preferably 12 to 16) in a 2.54 cm (1 inch) membrane. The height of the ridges is 0.05 to 0.23 mm (0.002 to 0.009 inch), preferably 0.08 to 0.13 mm (0.03 to 0.05 inch). If the ridge height is much smaller than 0.05 mm (0.002 inches), the ridge is difficult to detect. Also, while higher ridges are easier to detect, they require more material and are difficult to form, as described above.

By using a number of small ridges 22 shown in the gripping strip 24 of FIG. 6 as compared to the prior art, less material is used compared to the single gripping strip shown in FIG. Has an advantage. When a series of small ridges are extruded, it is easy to match the flow rate of the membrane during extrusion with the phage strip, and to match the speed of a relatively large rib such as rib 36 to the speed of the flat membrane being extruded with it. The problem that occurs when is eliminated. Another advantage of using a large number of small ridges is that uniform gripping is provided throughout the lip.

The gripping strips according to the invention not only provide a good feel, but also with a slippery hand when it is desired to pull or to hold the sacks to separate the reclosable fastening elements that can hold the lip in any place. It is very convenient because there is more than one ridge pressed. When the gripping strips of the prior art and the present invention having one single rib of the bag of ribs were tested with dry hands, the conventional gripping ribs were only 29% good while the gripping strips of the present invention were 63% good and 8%. Showed almost the same effect. In addition, when tested with a slippery hand, 25% of the conventional gypsum, 72% of the gypsum of the present invention was good and 3% showed almost the same effect, which is the worst condition of the gripping strip of the present invention. It can be seen that even better when tested.

Claims (8)

In a reclosable bag having opposing sidewalls (12, 13), a reclosable zippered fastening element (14) located at these opposing sidewalls, and an upper lip having a gripping strip and provided at the opposing sidewalls on the fastening element, respectively. Wherein the gripping strips comprise at least three ridges of height 0.05 mm (0.002 inches) or more and 0.23 mm (0.009 inches) and extending along the length of the lip in substantially parallel to each other. The reclosable bag of claim 1, wherein the number of ridges is between 7 and 24 per inch (2.54 cm) over the width of the gripping strip. 3. The reclosable bag of claim 2, wherein the height of the ridges is between 0.08 and 0.13 mm (0.003 and 0.005 inches). 4. The reclosable bag of claim 3, wherein the number of ridges is between 12 and 16 per inch (2.54 cm) over the width of the gripping strip. The reclosable bag of claim 1, wherein each ridge has a protrusion effective for gripping with the thumb or the other finger. A method of making a reclosable bag having gripping ridges formed on opposite sides of the bag, the method comprising: forming at least three cut sections in an extrusion die adapted to form a ridge in a compressed film adjacent to the ridge and at the same time; Spacing the cuts to have at least seven ridges per 2.54 cm (1 inch) of the grip strip width, shaping the cuts so that the grips are provided on the ridges and drawing down the gripping strips to retain the grips And maintaining at least seven ridges per 2.54 cm (1 inch) of the gripping strip. 7. The method of claim 6 wherein the draw down and cutting degree is adjusted such that the ridge height of the finished bag is greater than 0.05 mm (0.002 inches) and less than 0.23 mm (0.009 inches). 7. The method of claim 6, wherein the die is provided with 12 to 16 cuts.

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