JP3727479B2 - Bag with synthetic resin chuck - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bag body with a synthetic resin chuck, in which a male and female bite type chuck is provided in an opening, and a lateral gusset folded in a V shape is bonded to both sides.
[0002]
[Prior art]
As shown in FIG. 4, a chuck 3 is provided along the opening 2 of the bag body 1 formed by two body films on the front and back sides, and the lateral gusset 4 in which the film is folded in a V shape is used as the folding ridgeline. A bag body with a synthetic resin chuck, in which 4b is bonded to both sides 5 of the bag body 1 in parallel with the lines on both sides 5 of the bag body 1, is known, for example, in Japanese Patent Laid-Open No. 5-97151. Further, a bag body with a synthetic resin chuck in which the upper end portion of the horizontal gusset 4 is brought close to the inner surface of one of the two front and back body films with a sealing tape 6 is also known from Japanese Patent Application Laid-Open No. 8-34450. It is.
[0003]
[Problems to be solved by the invention]
In the production of the synthetic resin zipper-equipped bag having the above-mentioned known lateral gusset, a preferable film base material is selected and used according to the contents to be stored. Depending on factors such as adhesive strength, excessive external force, excessive filling, and extreme transportation process when the bag 1 is filled with the contents and the side gusset 4 is expanded as shown in FIG. Under unforeseen circumstances such as handling or dropping, a break may occur along the upper end edge 4a of the lateral gusset 4 between A and B, which is the adhesion point between the lateral gusset 4 and the body film. This is not a problem with respect to the strength of the base material for those using nylon as a base material, but the above-mentioned breakage may occur when the base material is a biaxially stretched polyester film.
[0004]
The cause of the breakage is that when the contents are filled, the lateral gusset 4 is inevitably developed as shown in FIG. 5, and the upper space of the lateral gusset 4 is the points A and B corresponding to the bonding points of the lateral gusset 4 and the body film. And a triangular pyramid shape supported by points C1 and C2 on the side 5. Moreover, if the external force to be developed still acts more than necessary, the stress is concentrated at the point A, and the fracture propagation phenomenon occurs in the direction of the point B along the upper edge 4a of the lateral gusset 4 starting from the point A. is there.
[0005]
The object of the present invention is to prevent breakage along the upper edge of the horizontal gusset in the bag body with a synthetic resin chuck provided with the horizontal gusset.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a synthetic resin in which a lateral gazette folded in a V-shape is bonded to both sides of two front and back body film films, and a male and female bite type chuck is provided inside the opening. In a bag body with a chuck, a lateral side extending from the outer side of the upper end edge of the lateral gusset to the opening side of the lateral side of the lateral gusset with the upper end edge serving as a bottom side at the outer side of the upper end edge of the lateral gusset. A triangular convex portion having a certain angle of inclination connecting the gusset outer extension line and the base is provided, and the triangular convex portion is bonded to a body film, and the chuck and the triangular convex portion are provided. Between the upper end edges of the horizontal gusset, either the front or back body film or the front or back body film and the sealing tape are directly bonded without sandwiching the horizontal gusset .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a bag formed by two front and back body film. Reference numeral 3 denotes a chuck provided along the opening 2 of the bag body 1, a lateral gusset 4 in which a film is folded in a V shape is formed on both sides of the bag body 1, and the folding ridge line 4 b is formed on the bag body 1. It is bonded to both sides 5 of the bag 1 in parallel with the lines on both sides 5. Further, the upper end portion of the lateral gusset 4 is brought close to and adhered to one of the inner side surfaces of the front and back two body film by the sealing tape 6.
[0008]
In the bag body with a synthetic resin chuck as described above, the outer edge (both sides 5 side) of the lateral gusset 4 has the upper edge 4a as the bottom, and intersects with the bottom at right angles. A triangular convex portion having a certain angle of inclination connecting a lateral gusset outer extension line 4c extending from the outside of the upper edge 4a of the lateral gusset 4 to the opening 2 side of the bag body 1 and the base (upper edge 4a). 7 and this triangular convex part 7 is the structure which adhere | attached the trunk | drum film.
[0009]
Since the present invention is configured as described above, when the bag 1 is filled with the contents, the lateral gusset 4 is inevitably expanded as shown in FIG. 3, and the upper space of the lateral gusset 4 has a triangular convex shape. The point D where the inclined line of the portion 7 and the lateral gusset outer extension line 4c intersect, the point E where the inclined line and the upper edge 4a (bottom side) of the lateral gusset 4 intersect, the point B of the inner edge of the upper edge 4a and the side 5 Supported by points C1 and C2. The triangular convex portions 7 are provided symmetrically on both sides of the V-shape of the lateral gusset 4 folded into a V-shape, and form an upper space as shown in FIG. 3 when fully expanded.
[0010]
As shown in FIG. 2, when an excessive external force F for expanding and expanding is applied to a portion corresponding to the point A of the conventional structure, the stress is between the points D and E of the triangular convex portion 7. Disperses toward the slope line. This stress dispersion action relieves stress concentration that breaks in the direction of point B along the upper edge 4a of the lateral gusset 4.
[0011]
Therefore, excessive external force when the lateral gusset 4 is fully expanded, excessive filling, handling of an extreme transportation process, or dropping, etc., eliminates the propagation phenomenon of fracture along the upper edge 4a of the lateral gusset 4 in the B point direction. It retains a good-looking form.
[0012]
In addition, although the said embodiment is an example which applied this invention to the bag body which brought the upper end part of the horizontal gusset 4 near the inner surface of either one of the body film of 2 sheets of front and back by the sealing tape 6, The present invention is also applied to a bag body in which the seal tape 6 is not used or a bag body in which the upper end portion of the lateral gusset 4 is brought close to the inner surface of one of the front and back body film with a chuck tape with a chuck. Is done.
[0013]
【The invention's effect】
As described above, according to the present invention, a triangular convex portion having a certain angle of inclination with the upper end edge as a base is provided outside the upper end edge of the horizontal gusset, and the triangular convex portion is bonded to the body film. Because of the configuration, excessive external force for the expansion action of the lateral gusset is dispersed by the triangular convex portion to relieve stress concentration that breaks along the upper edge of the lateral gusset, and at the upper edge of the lateral gusset. It is possible to provide a bag body with a zipper made of synthetic resin, which is provided with lateral gussets on both sides, which prevents propagation of fracture along the side and has good appearance and good quality.
[Brief description of the drawings]
FIG. 1 is a front view of an essential part showing a first embodiment of the bag of the present invention. FIG. 2 is an explanatory diagram when the lateral gusset of the bag of the present invention is fully expanded and an external force is applied. FIG. 4 is a perspective view showing a fulcrum of the upper space of the lateral gusset when the lateral gusset of the bag is inflated. FIG. 4 is a front view of the main part showing an example of a conventional bag. FIG. Is a perspective view showing the fulcrum of the upper space of the horizontal gusset when the bulge expands
DESCRIPTION OF SYMBOLS 1 Bag body 2 Opening part 3 Chuck 4 Horizontal gusset 4a Upper edge 4b of horizontal gusset Edge 4c of horizontal gusset Horizontal gusset outer extension line 5 Side 6 Sealing tape 7 Triangular convex part

Claims (1)

In a bag with a synthetic resin zipper, in which a lateral gusset folded in a V-shape is bonded to both sides of the front and back body film, and a male and female bite type chuck is provided inside the opening, the upper end of the horizontal gusset A constant tie that connects the bottom side with a lateral gusset outer extension line that extends from the outer side of the upper end edge of the horizontal gusset to the opening side of the bag body, with the upper end edge serving as a bottom side on the outer side of the edge. A triangular convex portion having an inclination of an angle is provided, and this triangular convex portion is adhered to the trunk film, and the upper and lower edges of the lateral gusset having the chuck and the triangular convex portion are arranged on the front and back trunk films. Alternatively , a bag with a synthetic resin zipper, wherein either the front or back body film and the sealing tape are directly bonded without sandwiching a lateral gusset .

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