JP2589529Y2 - Easy opening bag - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag having an easy opening function that can be opened and cut straight.

[0002]

2. Description of the Related Art Conventionally, as a means for opening a bag, a V-notch, an I-notch (cut) or the like is provided at an end of a seal portion of the bag, and the bag is torn when the bag is opened. , It becomes difficult to tear,
There is a problem in that it is displaced from the portion to be opened, cuts diagonally, and cannot be cut straight. In this case, the bag base material is a material that can be torn, and it goes without saying that the thickness, the material, and the like are taken into consideration. As a means for solving these problems, as disclosed in Japanese Utility Model Application Laid-Open No. 4-60428, a polyolefin resin film on the inner surface of a bag base material is provided with stripe-like irregularities to facilitate cutting, and along a stripe. Which can be cut in a straight line.

[0003]

However, if the inner surface of the bag base material is provided with stripe-shaped irregularities, the direction of the stripe is one direction, so that the inner surface of the bag base material is easily curled in parallel with the stripe, The inner surface of the base material is overlapped to make two sheets,
When the ends are heat-sealed to form a bag, there is a problem that the two sheets cannot be overlapped without a gap, and if they are sealed as they are, wrinkles may be generated. Further, in the shape of the stripe-shaped unevenness, if the convex portion is smaller than the concave portion,
There is a problem in that it does not cut along the concave portion, gets over the convex portion, reaches the adjacent concave portion, and consequently does not cut straight.

[0004]

In order to solve the above-mentioned problems, the present invention relates to a bag composed of two or more base sheets, wherein all or a part of the innermost layer of the base sheet has a grid pattern. A bag provided with a groove.

[0005] The first invention of the present invention is a base material having two or more layers.
The entire innermost layer of the base sheet.
Or a part of the grid is provided with a grid,
The surface formed by providing the grooves is a convex of a group of rectangular convexes.
Thickness (H) of the innermost layer in the groove and the innermost layer in the groove
When the ratio with the thickness (h) of the layer is H: h = 100: 10 to 50
The thickness (h) of the innermost layer is 5 μm or more, and
The ratio of the length of the short side (W) of the rectangle of the convex portion to the groove width (w) is
W: w = 100: 20 to 50, and the groove width (w) is 2
It is an easy-open bag characterized by being at least 00 μm.

The present invention is based on the above-mentioned invention,
The easy opening bag provided with the groove of
You.

[0007]

[Function] The innermost layer of the base sheet of the bag is a layer on the opposite surface when the base sheets are stacked to form a bag.
If the groove is provided in the innermost layer of the bag base sheet only in the vertical or horizontal direction, it is easy to curl in parallel to the groove,
By providing the cross-cut grooves, that is, the grooves in which the vertical grooves, the horizontal and the grooves intersect each other at right angles, curl in one direction of the base sheet is suppressed by the orthogonal grooves. Also, when a grid-like groove is provided, a group of convex portions having a rectangular surface is automatically formed. The thickness (H) of the innermost layer of the convex portion and the thickness (h) of the innermost layer of the groove portion are different from each other. Since the ratio is H: h = 100: 10 to 50, and the ratio between the rectangular edge (W) of the convex portion and the groove width (w) is W: w = 100: 20 to 50, Once the tearing starts, it continues to tear along the linear groove, and the detachment from the groove is suppressed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. FIG. 2 is a plan view in which a checkered groove is provided in a part of the innermost layer of the base sheet of the bag, FIG. 3 is a cross-sectional view of the checkered groove in FIG. 2, and FIG. FIG. 4 is a perspective view of FIG. 3, and FIG. 4 shows the base sheet in FIG. 2 so that the innermost surface of the base sheet and the cross-shaped grooves face each other.
It is a plan view in which the sheets are stacked and sealed in four sides to form a bag (in the figure, there is a grid-like groove on the front side, but actually there is a grid-like groove inside the bag) 5) and FIG. 5 show other shapes of the grid-like grooves.

As shown in FIG. 3, a transparent polyester film 11 having a thickness of 24 μm, a printed pattern layer 14, an aluminum foil 12 having a thickness of 9 μm, and a 30 μm
CPP (cast polypropylene) film 1
3 were sequentially laminated to form a four-layer base sheet 10. If necessary, an adhesive layer is provided between the layers.
As the innermost layer, a layer of a so-called resin film for a sealant, which is a thermoplastic plastic film such as polyethylene or polypropylene and can be bonded by heat sealing, is used. As shown in FIG. 2, the base sheet 10
Although the grid-like groove 21 is provided in a part of the innermost layer of the inner layer 0, the protrusion 3 is automatically provided as shown in FIGS.
Although one group is formed, as shown in FIG.
Is 30 μm because it is equal to the thickness of the innermost layer. The thickness (h) of the innermost layer of the groove 21 was set to 8 μm. The width (W) of the projection 31 is 300 μm, and the width (w) of the groove 21 is 100 μm.
Provided. Bag making was performed by a normal bag making method (three-sided seal, four-sided seal, back seal, etc.) so as to face the cross-cut grooves 21 provided in a part of the base sheet 10. In this embodiment, a four-way seal was performed as shown in FIG. The portions of the cross-cut grooves 21 facing each other serve as opening scheduled portions 42. A V-notch 43 is provided on one of the right and left seal portions 41 of the scheduled opening portion 42.

[0010] Upon opening, tearing starts from the V-notch 43, and after the seal portion 41, the cross-shaped groove shape remains, and when the groove reaches the nearest groove, a linear shape is formed along the groove. Continued to tear.

To give a supplementary explanation, the thickness (H) of the projection is
The thickness (h) of the groove is preferably 5 μm or more for reasons such as prevention of pinhole generation and accidental tearing of the innermost layer. The ratio between H and h is
Within the range of 100: 10 to 50, preferably 100: 1.
The range is from 5 to 25. If the ratio is 100: 50 or more, the film may break beyond the groove when opened. The width (W) of the projection is preferably 400 to 1500 μm, and the width (w) of the groove needs to be 200 μm or more so that the groove can be torn linearly when opened. The ratio of W to w is in the range of 100: 20 to 50, preferably 100: 20.
25 to 35. If the ratio is 100: 50 or more, the tearing in the groove at the time of unsealing progresses, meandering occurs in the groove, and therefore, only the groove advances beyond the convex portion. In particular, the width (W) of the projection corresponds to the thickness (H). When (H) is thick, (W) may be narrow, and when (H) is thin, (W) may be relatively wide.

There are various possible means for providing a groove in the innermost layer. For example, the means is provided by an embossing method. In the embossing method, after the innermost layer is extruded and laminated by an extruder, the resin is embossed with an embossing roll, cooled, and solidified while the resin is hot. Alternatively, embossing may be performed on the cooled base sheet having the innermost layer laminated thereon, or a heated embossing roll or embossed plate may be pressed onto the innermost layer. Alternatively, the innermost layer film that has been embossed in advance may be laminated via an adhesive. In this case, a shape as shown in FIG. 5 can be created as the embossed shape of the innermost layer film that has been embossed in advance. To laminate this embossed film, laminate the adhesive so that the adhesive is embedded in the concave portion formed on the back surface of the convex portion. By doing so, a substrate sheet having the same convex portions and grooves as in the example can be obtained.

It is desirable that the vertical and horizontal grooves in the grid pattern are either vertical or horizontal, and are parallel to one side of the bag base material. In addition, the rectangle of the shape of the surface of the projection includes a square. In this embodiment, a part of the base sheet is
Although a grid-like groove is provided, it may be provided on the entire innermost layer. It is desirable to provide an initial tearing structure such as a V notch or an I notch as opening start means.

[0014]

[Effect of the invention] A grid-like groove is provided in the base sheet of the bag,
Further, since the depth and width of the groove are regulated, the bag can be torn linearly along the groove when opening the bag. Since curling of the base sheet is suppressed, no wrinkles are generated when the bag is formed. Since the grooves are in a grid pattern, for example, if grooves are provided on the entire surface of the base material sheet, the bag can be opened from both the vertical and horizontal sides. Since the innermost layer is a group of projections, when overlapping with another film, the contact area is reduced, so that there is an effect that blocking can be prevented. Although the protrusions and grooves are provided only on the innermost layer, if the protrusions and grooves are completely crushed at the time of sealing, the tightness of the bag is completely maintained. Further, since the convex portion and the groove are provided only in the innermost layer, and there is no irregularity on the surface of the base material, the bag itself can maintain a beautiful design.

[Brief description of the drawings]

FIG. 1 is a perspective view of FIG. 3 in an embodiment of the present invention.

FIG. 2 is a plan view of the bag according to the embodiment of the present invention, in which a part of the innermost layer of the base sheet is provided with a grid-like groove.

FIG. 3 is a cross-sectional view of a cross section of the grid in FIG. 2 according to the embodiment of the present invention;

FIG. 4 is a plan view of the bag according to the embodiment of the present invention.

FIG. 5 shows another shape of a grid-like groove.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Base material sheet 11 ... Polyester film 12 ... Aluminum foil 13 ... CPP film 14 ... Printed pattern layer 21 ... Cross-shaped groove 31 ... Convex part 40 ... Bag 41 ... Seal part 42 ... Scheduled opening part 43 ... V notch

Claims (2)

(57) [Scope of request for utility model registration] 1. A bag comprising two or more base sheets.
Therefore, all or a part of the innermost layer of the substrate sheet has a grid pattern.
Are provided, and by providing the grid-like grooves,
Thickness of the innermost layer at the projections of the group of projections whose surface is rectangular
(H) and the thickness (h) of the innermost layer in the groove portion
Is H: h = 100: 10 to 50, and the thickness of the innermost layer is
(H) is 5 μm or more, and the short side of the convex rectangle
The ratio of the length (W) to the groove width (w) is W: w = 100: 2.
0 to 50, and the groove width (w) is 200 μm or more.
An easily opened bag characterized by the following. 2. A cross section of the substrate sheet to be opened in a grid pattern.
2. The easy-open bag according to claim 1, wherein the bag is provided.