JP2000177751A - Bag body having zipper made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a breakage along the upper end edge of side gussets from being generated in a bag body having a zipper made of a synthetic resin, which is equipped with the side gussets. SOLUTION: On the outside of the upper end edge 4a of a side gusset 4, a protrusion-form section 7 wherein the upper end edge 4a is made a bottom edge, having a diagonal line for which a side gusset outside extended line 4c extending from the outside of the upper end edge 4a of the side gusset 4 to an opening 2 side of this bag body 1, and the inside of the upper end edge 4a are connected, is provided, and the side gusset 4 having the protrusion-form section 7, is bonded to a body section film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag with a synthetic resin chuck having a male / female occlusal type chuck at an opening and a V-shaped horizontal gusset bonded to both sides. .

[0002]

2. Description of the Related Art As shown in FIG. 14, a chuck 3 is provided along an opening 2 of a bag 1 formed by two front and rear body films, and a horizontal gusset 4 formed by folding the film into a V-shape. A bag with a synthetic resin chuck having the folding ridge line 4b adhered to both sides 5 of the bag 1 in parallel with the lines of both sides 5 of the bag 1 is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-97.
No. 151. Further, a bag with a synthetic resin chuck, in which the upper end of the horizontal gusset 4 is brought close to and adhered to one of the inner surfaces of the two body films by the sealing tape 6, is also known in JP-A-8-34450. It is.

[0003]

In the production of a bag with a synthetic resin chuck having the above-mentioned known horizontal gusset, a preferred film substrate is selected and used in accordance with the contents to be stored. Depending on factors such as thickness, thickness, and interlayer adhesion strength of the constituent material itself, excessive external force when the bag 1 is filled with contents and the lateral gusset 4 which is a side gore portion expands as shown in FIG. Breakage along the upper edge 4a of the horizontal gusset 4 between AB, which is the point of adhesion of the horizontal gusset 4 and the body film, under unexpected situations such as excessive filling, handling of the extreme transport process, or falling. There is. This is less problematic in the strength of the substrate for those based on nylon, but the above-mentioned fracture may occur even if the base material is a biaxially oriented polyester film, a biaxially oriented polypropylene film, polyethylene or the like. is there.

The cause of the breakage is that when the contents are filled, the horizontal gusset 4 inevitably expands and expands as shown in FIG. 15, and the upper space of the horizontal gusset 4 corresponds to the bonding point between the horizontal gusset 4 and the body film. Points A and B and C5 and C2 on side 5
It has a triangular pyramid shape supported by points. Moreover, if the external force to be developed still acts more than necessary, the stress concentrates at the point A, and a fracture propagation phenomenon occurs in the direction of the point B along the upper edge 4a of the horizontal gusset 4 starting from the point A. is there.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent a bag with a synthetic resin chuck provided with a horizontal gusset from breaking along the upper edge of the horizontal gusset.

[0006]

In order to achieve the above-mentioned object, the present invention has a structure in which a horizontal gusset folded into a V-shape is bonded to both sides of two front and back body films, and the inside of the opening is provided. In a bag with a synthetic resin chuck provided with a male and female occlusal type chuck, the upper end edge is a bottom side outside the upper end edge of the horizontal gusset, and the right side crosses the bottom side at a right angle from the outer side of the upper end edge of the horizontal gusset. A lateral gusset outside extension line extending to the opening side of the bag body and a convex portion having an inclined line connecting the inside of the upper edge are provided, and the lateral gusset having the convex portion is bonded to the body film. It is characterized by the following.

[0007] The present invention is characterized in that the inclined line of the convex portion is a single straight line.

[0008] The present invention is characterized in that the inclined lines of the convex portion are a plurality of straight lines having different angles.

[0009] The inclined line of the convex portion is a combination of a straight line and a curved line.

[0010] The present invention is characterized in that the inclined line of the convex portion is a combination of curves connecting straight lines.

[0011] The inclined line of the convex portion may be a curved line.

[0012] The inclined line of the convex portion extends to the inner end of the upper edge of the horizontal gusset.

[0013] The inclined line of the convex portion extends between the outer end and the inner end of the upper edge of the horizontal gusset.

The inclined line of the convex portion and the upper edge of the horizontal gusset are connected by a curved line.

[0015] The present invention is characterized in that the inclined line of the convex portion is located below an imaginary straight line connecting the upper and lower ends of the inclined line at the shortest distance.

[0016]

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 body films. Reference numeral 3 denotes a chuck provided along the opening 2 of the bag 1, and a lateral gusset 4 formed by folding a film into a V-shape on both sides of the bag 1; It is adhered to both sides 5 of the bag 1 in parallel with the lines of both sides 5. Also,
The upper end of the horizontal gusset 4 is brought into contact with one of the inner surfaces of the two body films by a sealing tape 6 and adhered thereto.

According to the present invention, in the bag with the synthetic resin chuck as described above, the upper end edge 4a is formed at the bottom outside the upper end edge 4a of the horizontal gusset 4 (on both sides 5), and is perpendicular to the bottom. And a lateral gusset outer extension line 4c (D) extending from the outside of the upper edge 4a of the horizontal gusset 4 to the opening 2 side of the bag body 1, and an inner end (B) of the upper edge 4a.
Alternatively, a convex portion 7 having an inclined line connecting the inner middle portion (B2) is provided, and the horizontal gusset 4 having the convex portion 7 is bonded to the body film.

The inclined line of the convex portion 7 has various forms. That is, as shown in FIG. 1 and FIG. 2, one straight line 8 (Example 1), and as shown in FIG. 4, two straight lines 8 a and 8 b having different inclination angles (Example 1). 2), as shown in FIG. 5, three straight lines 8a, 8b, 8c having different inclination angles (Example 3),
As shown in FIG. 6, the combination of the straight line 8b and the curve 9 (Example 4), and as shown in FIG. 7, the straight line 8a and the curve 9 extend to the middle B2 of the upper edge 4a of the horizontal gusset 4 (the embodiment). Example 5) and a combination of a curve 9 connecting a straight line 8a and a straight line 8b as shown in FIG. 8 (Example 6).

Further, as shown in FIGS. 9 and 10, the curve 9 (Embodiment 7) is used, and as shown in FIG.
The curve 9a having a radius R1 centered at 1 and the curve 9b having a radius R2 centered at 02 have different curvatures (Example 8), and as shown in FIG. This extends to the middle B2 of the upper edge 4a (Example 9).

Further, the inclined line of the convex portion 7 can be selected from various forms without being limited to the illustrated embodiment, but such an inclined line can be a horizontal line as seen in the fifth and ninth embodiments. Midway between the outer edge and the inner edge of the upper edge of the gusset (B
2) or may extend to the inner end (B) of the upper edge of the horizontal gusset as in other embodiments.

In each of the inclined lines of the first to ninth embodiments, the lower and upper ends (D)-(B) or (D)-(B2) connecting the upper and lower ends (D)-(B2) of the inclined lines are located below a virtual straight line. It is located.

Since the present invention is configured as described above, when the contents are filled in the bag 1, the horizontal gusset 4 is inevitably expanded and expanded as shown in FIGS. The upper space is supported by a point D at which the inclined line of the convex portion 7 intersects with the lateral extension line 4c of the horizontal gusset, a point B at the inner end of the upper edge 4a or a point B2 at the middle of the inner side, and points C1 and C2 of the side 5. .

As shown in FIGS. 2 and 10, when an excessive external force F for the action of expanding and expanding is applied to a portion corresponding to the point A in the conventional structure, the stress is reduced by the D of the convex portion 7. -Disperse on the inclined line between the points B or the points DB2. By this stress dispersing action, the stress concentration that breaks in the direction of point B along the upper edge 4a of the horizontal gusset 4 is reduced. This relaxation of the stress concentration can be effectively obtained in all the inclined line forms of the first to ninth embodiments.

That is, regarding the first to ninth embodiments, the convex portion 7
In the embodiment in which the inclined line is formed over the entire width of the horizontal gusset 4, or in the embodiment in which the inclined line extends between the outer end and the inner end of the upper edge of the horizontal gusset 4, the convex portion 7 is formed. A large stress dispersion range can be obtained that disperses on the inclined line between the point DB and the point DB2.

In the case of the latter (D-B2), the former (D-B2)
Although the dispersion range is narrower than that of -B), since the stress is surely dispersed at a point which is a point from the outside to the inside of the horizontal gusset 4, a satisfactory effect can be obtained as much as possible. .

In particular, two straight lines 8a and 8b having different inclination angles (Embodiment 2), three straight lines 8a, 8b and 8c having different inclination angles (Embodiment 3), The combination of the straight line 8b and the curve 9 (Example 4), the combination of the straight line 8a and the curve 9 extending to the middle B2 of the upper edge 4a of the horizontal gusset 4 (Example 5), the straight line 8
a of the curve 9 connecting the straight line 8b and the straight line 8b (Embodiment 6), and the combination of the curve 9 (Embodiment 7).
2 is a composite curve having a different curvature from the curve 9b (Example 8), and the upper edge 4a of the horizontal gusset 4 is
(Example 9) of the intermediate portion B2 is the DB of the convex portion 7.
The substantial length of the inclined line between the points or between the two points D-B is longer than the virtual straight line between the points D-B or the two points D-B of the convex portion 7, so that a large stress dispersion range can be obtained. is there.

In addition, in each of Embodiments 2 to 9, the inclined line of the convex portion 7 is located below an imaginary straight line connecting the upper and lower ends of the inclined line at the shortest distance. By reducing the burden on the upper and lower ends,
The load is positively distributed and received by the inclined portion located below.

Accordingly, when the lateral gusset 4 expands and expands, the excessive propagation of the external gusset, excessive filling, the handling of the extreme transport process, or the propagation of the fracture in the direction of the point B along the upper edge 4a of the lateral gusset 4 due to the fall or the like. This eliminates the phenomenon and maintains a good-looking form.

The above-described embodiment is an example in which the present invention is applied to a bag body in which the upper end of the horizontal gusset 4 is moved to and adhered to one of the inner surfaces of the two body films by the sealing tape 6. However, there is also a bag in which the sealing tape 6 is not used, or a bag in which the upper end of the horizontal gusset 4 is attached to one of the inner surfaces of the two body films by a sealing tape with a zipper and adhered. The invention applies. In addition, the inclination angle of the straight line of the inclination line and the curvature of the curve are arbitrarily set as needed.

[0030]

As described above, according to the present invention, the opening of the bag body is formed outside the upper edge of the horizontal gusset, with the upper edge being the bottom, and intersecting at right angles with the bottom, from outside the upper edge of the horizontal gusset. Provide a convex portion having an inclined line connecting the horizontal gusset outside extension line extending toward the portion side and the inside of the upper end edge,
Since the horizontal gusset having the convex portion is bonded to the body film, excessive lateral force for the action of expanding and expanding the horizontal gusset has a long inclined line, and the stress is distributed by the convex portion having a large stress distribution range. Made of synthetic resin with wide gussets on both sides, which are widely dispersed and reduce the stress concentration that breaks along the upper edge of the horizontal gusset, prevent propagation of fracture along the upper edge of the horizontal gusset, and have good appearance and good quality A bag with a chuck can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a bag of the present invention.

FIG. 2 is an explanatory view when the lateral gusset of the bag of the present invention is inflated and deployed and an external force is applied.

FIG. 3 is a perspective view showing a fulcrum of an upper space of the lateral gusset when the lateral gusset of the bag of the present invention is fully expanded.

FIG. 4 is a front view of an essential part showing a form of an inclined line of a convex portion.

FIG. 5 is a front view of an essential part showing a form of an inclined line of a convex portion.

FIG. 6 is a front view of a main part showing a form of an inclined line of a convex portion.

FIG. 7 is a front view of an essential part showing a form of an inclined line of a convex portion.

FIG. 8 is a front view of an essential part showing a form of an inclined line of a convex portion.

FIG. 9 is a front view of a main part of the bag of the present invention.

FIG. 10 is an explanatory view when the lateral gusset of the bag of the present invention is inflated and deployed and an external force is applied.

FIG. 11 is a perspective view showing a fulcrum of an upper space of the lateral gusset when the lateral gusset of the bag of the present invention is inflated and expanded.

FIG. 12 is a front view of an essential part showing a form of an inclined line of a convex portion;

FIG. 13 is a front view of an essential part showing a form of an inclined line of a convex portion.

FIG. 14 is a front view of a main part showing an example of a conventional bag body.

FIG. 15 is a perspective view showing a fulcrum of an upper space of the horizontal gusset when the horizontal gusset of the conventional bag body is inflated and expanded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag 2 Opening part 3 Chuck 4 Horizontal gusset 4a Upper edge of horizontal gusset 4b Edge line of horizontal gusset 4c Horizontal gusset outside extension line 5 Side 6 Seal tape 7 Convex part 8 Straight line 8a Straight line 8b Straight line 8c Straight line 9B Curve 9A curve curve

Claims (10)

[Claims] 1. V-shaped films on both sides of two body films
Adhering the lateral gusset folded in a letter shape, in a bag with a synthetic resin chuck provided with a male and female occlusal type chuck inside the opening, outside the upper edge of the horizontal gusset, the upper edge is the bottom edge, A protruding portion having a horizontal gusset outside extension line that intersects perpendicularly with the bottom side and extends from the outside of the upper edge of the horizontal gusset to the opening side of the bag body and an inclined line connecting the inside of the upper edge, A bag with a synthetic resin chuck, wherein the horizontal gusset having the convex portion is bonded to a body film. 2. The bag with a synthetic resin chuck according to claim 1, wherein the inclined line of the convex portion is a single straight line. 3. The bag with a synthetic resin chuck according to claim 1, wherein the inclined lines of the convex portion are a plurality of straight lines having different angles. 4. The bag with a synthetic resin chuck according to claim 1, wherein the inclined line of the convex portion is a combination of a straight line and a curved line. 5. The bag with a synthetic resin chuck according to claim 1, wherein the inclined line of the convex portion is a combination of curves connecting straight lines. 6. The bag with a synthetic resin chuck according to claim 1, wherein the inclined line of the convex portion is a curve. 7. The bag with a synthetic resin chuck according to claim 1, wherein the inclined line of the convex portion extends to an inner end of an upper edge of a horizontal gusset. 8. The synthetic resin chuck according to claim 1, wherein the inclined line of the convex portion extends between the outer end and the inner end of the upper edge of the horizontal gusset. Bag. 9. The bag with a synthetic resin chuck according to claim 8, wherein the inclined line of the convex portion and an upper edge of a horizontal gusset are connected by a curved line. 10. The method according to claim 1, wherein the inclined line of the convex portion is located below an imaginary straight line connecting upper and lower ends of the inclined line at a shortest distance. Bag with synthetic resin chuck.