JP3449966B2 - Manufacturing method of gusseted bag - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to two members or one.
The present invention relates to a method for manufacturing a bag with a gusset formed by joining two members.

[0002]

2. Description of the Related Art Conventionally, a gusseted bag has three members 70, 72 for front and back parts and a member 71 for gusset as shown in FIG.
a, 70b, 70c and corresponding edges 71a, 71 of the member 71
b and 71c are the edges 71a ', 71b' of the member 71,
71c 'and the corresponding edges 72a, 72b, 72c of the member 72
And are welded by suitable means.

Alternatively, as shown in FIG. 11, a member 80 and a member 81 having gusseted portions on three sides are prepared, and end edges 80a, 80b, 80c of the member 80 and a corresponding end edge 81 of the member 81 are prepared.
a, 81b, 81c to the end edges 80d, 80 of the member 80.
It is manufactured by welding the d's and the edges 80e, 80e 'by a suitable means.

[0004]

However, as shown in FIG.
In a bag with a gusset composed of members 70 to 72 such as
It is necessary to weld the corresponding edges of the member 70 and the member 71 and the member 71 and the member 72 to each other, and it takes time and effort to perform the welding, and a member 71 for a gusset having a different form from the members 70 and 72 is prepared. There is a need. Therefore, it is costly and not suitable for mass production.

In the gusseted bag composed of the members 80 and 81 as shown in FIG. 11, the number of places where the edges are fitted to each other is small, but this is still large, and it is necessary to prepare a member 80 having a different form from the member 81. There is. Therefore, the cost is not reduced so much and the productivity is not improved.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a method for manufacturing a gusseted bag that realizes cost reduction and productivity improvement.

[0007]

In order to achieve the above object, the method for producing a gusseted bag according to claim 1 of the present invention comprises:
One end of a stack of front and back members
Join the edges to each other near both corners, and at the two corners
Each is diagonally joined to the edge that intersects the edge,
Rectangular shape with thickness equivalent to this gusset
Insert the internal insertion mold of this into the joining line
Butt, and join line other than the above corner to the join line
Align one of the members inside with the opposite internal insert edge
Slide it along the side of the insertion mold, and in this state
Both edges of the material and both edges of the other member facing the both edges
It is characterized in that a portion close to each other is joined to each other .

By this manufacturing method, the front member and the back member
A bag with a gusset made by stacking and joining the members for
Hold the gusset on the front and back on each side of this bag.
Side joining line joined to each other and the front part at the bottom
Bottom joining line where the back and back are joined to each other with a gusset
From the both ends of the bottom joining line near the bottom of the side
Diagonal joining that extends diagonally toward each side joining line
A gusseted bag with lines is obtained.

According to this manufacturing method, in the case of the simplest form, it suffices to prepare two members of the same size, and the bottom joining line and the diagonal joining line of the finished bag are formed by the first joining, The final joining forms the side joining line. That is, it is sufficient to prepare two members having the same shape and size, and the joining work is greatly simplified, so that the cost can be reduced and the productivity can be remarkably improved.

On the other hand, a method of manufacturing a bag with a gusset according to claim 2
The method is to fold back one member for the front part and the back part and fold them together ,
Diagonally from the line to the edge intersecting the fold line
It has a thickness equivalent to that of a gusset after being joined.
Insert a rectangular insert mold and fold this insert mold.
Butt against the return line, and the return line to the return line
Insert the fold line in line with the opposite internal insert type edges.
Slide one piece along the side of the internal insertion type
In the state of both edges of the one piece and the other piece facing the both edges concerned
It is characterized in that the portions near both edges are joined to each other .

According to this manufacturing method, 1 for the front part and the back part
With a gusset made by folding back two members and overlapping them
A bag, the front and back of which are on each side of the bag.
Is a side joining line that is joined to each other with a gusset, and the side
Near the bottom of the surface, from the intersection of both sides of the side
Diagonal joining line that extends diagonally toward the side joining line
A gusseted bag having an in is obtained.

In this manufacturing method, it is sufficient to prepare only one member, and it is possible to further reduce the cost and improve the productivity.

[0013] In the production method of the present invention is may simply joining members together manually, from increased productivity, in the manufacturing method of claim 1, one of the member or one piece Slide along the side of the internal insertion type,
Set in a lower mold having a concave cross section, and place one member or one piece between both inner side walls of the lower mold and both side surfaces of the internal insertion mold, and in this state, one member or one piece Both end edges and the other member or the portion of the other piece near both end edges may be welded by the upper top plate.

In the present invention, as the member, for example, a tough and flexible sheet is used to some extent. The material of the sheet is PE, PP, PVC, EVA, EMM
A, olefin type is shown, and the color may be colorless and transparent or may be colored and is not specified.
Further, although the shape is also free, in consideration of the function as a bag, as described in the following embodiments, the one with a lid is preferable.

Further, the joining includes heat welding, high frequency welding, ultrasonic welding, impulse welding, suture and the like.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on embodiments.

A perspective view of the gusseted bag according to the embodiment is shown in FIG. This gusseted bag 1 is formed by stacking and joining a member for the front portion 2 (for example, a sheet) and a member for the back portion 3 (also a sheet), and the front portion 2 is provided on each side of the bag 1. And a side surface joining line 5 where the back portion 3 is joined to each other with a gusset 4, and a bottom surface joining line 6 where the front portion 2 and the back portion 3 are joined to each other with a gusset 4 at the bottom surface,
It has diagonal joining lines 7 that extend obliquely from both ends of the bottom joining line 6 toward the side joining lines 5 near the bottom of the side faces. Further, the bag 1 is provided with a lid 8 having an extended back portion 3, and the button 9a attached to the lid 8 and the button 9b attached to the front portion 2 can be attached / detached to open / close the bag 1. It has become.

In this gusseted bag 1, there is a bottom surface joining line 6 on the front side of the bottom surface, and the bottom surface joining line 6 extends obliquely toward the side surface joining line 5 toward the bottom surface of the side surface to form an oblique joining. The line 7 is continuous with the bottom joining line 6.

Next, a method of manufacturing the gusseted bag 1 will be described. In FIG. 2, first, a member 12 for the front part 2 and a member 13 for the back part 3 are prepared. However, although the member 13 is longer by 8 minutes than the lid, here, the members 12 and 13 are
Have the same width. Of course, the widths of the members 12, 13 may be different. Both members 12 and 13 are overlapped as shown in FIG.
Weld each other straight up to near 0 and both corners 20
At, the respective edges 21 cross each other and are obliquely welded to each other. That is, welding is performed along the one-dot chain line. By this welding, the bottom surface joining line 6 and the diagonal joining line 7 in the bag 1 of FIG. 1 are formed. In addition,
The unnecessary portion of the one end edge 21 and the corner 20 are fused at the same time as the welding.

Here, the angle θ formed by the bottom joining line 6 and the oblique joining line 7 is preferably about 45 °, but 45 °.
There is no need to limit it to, and it may be appropriately selected within a range of about 45 °.

Further, since the diagonal joining line 7 finally determines the width of the gusset 4 of the bag 1, when it is desired to obtain a large amount of the gusset 4, the diagonal joining line 7 may be lengthened. The width of the gusset 4 can be adjusted by the length of 7.

A side view after the welding is shown in FIG.
A joining line 25 consisting of the lines 6 and 7 is formed at one end edge of both members 12 and 13.

Then, a rectangular internal insert die 30 having a thickness corresponding to the gusset 4 is inserted into the joined members 12 and 13, and the internal insert die 30 is as shown in FIG. It is a rectangular body having a thickness t corresponding to the gusset 4 of the bag 1.

Then, as shown in FIG. 6, the members 12, 1
The inner insertion die 30 is abutted against the joining line 25 of No. 3, and the joining line other than the corner 20 (that is, the bottom joining line 6) is aligned with the edge 30a of the inner inserting die 30 facing the bottom joining line 6, and one member (Here, the member 12) is displaced along the side surface 31 of the internal insertion mold 30, and in this state, both end edges of the member 12 and both end edges of the member 13 facing the both end edges are joined to each other. For this, a molding tool as shown in the schematic view of FIG. 7 is used.

The molding tool comprises a lower mold 40 for accommodating the inserted inner mold 30 and an upper top plate 45. The lower mold 40 has a concave cross section as shown in the transverse sectional view of FIG. is there. The upper top plate 45 performs pressurization / welding by high frequency heating, ultrasonic heating, heater heating, impulse heating, or the like.

The lower die 40 is set with the inner insertion die 30 inserted (see FIG. 6). At this time, in this case, in FIG.
8 and the member 12 in FIG.
It is located between both inner side walls 41 and both side surfaces 31 of the inner insertion mold 30. In this state, both end edges 12a of the member 12 and a portion of the member 13 opposed to the end edge 12a near both end edges 13a are pressed and welded by the upper top plate 45. As a result, the side surface joining line 5 of the bag 1 of FIG. 1 is formed, and the bag 1 is almost completed. Of course, the unnecessary portion is melted off at the same time as the welding.

After that, by attaching buttons 9a and 9b to the lid 8 and the front portion 2 which are the extended portions of the back portion 3 of the bag 1, the gusseted bag 1 is completed.

According to this manufacturing method, it suffices to prepare two members 12 and 13 having substantially the same shape, and the welding is completed in two times. Therefore, the manufacturing is easy, and the cost reduction and the productivity improvement can be realized.

In the above manufacturing method, the two members 12, 13 are
However, it can be manufactured by using one member. In this case, as shown in FIG. 9, one strip-shaped member (for example, sheet) 50 having a combined length of the front portion and the back portion (including the lid) is prepared, and the strip-shaped member 50 is folded back and overlapped. At both corners 60 of the folding line 61 of the object, they are obliquely welded to each other from the folding line 61 to the end edge 62 intersecting with the folding line 61. As a result,
The diagonal joining line 7 in the bag 1 is formed. Of course,
Since the one piece and the other piece are continuous with the folding line 61 interposed therebetween, it is not necessary to weld along the folding line 61. Therefore, in this case, the bottom surface joining line 6 is not formed. After that, the manufacturing method using the two members 12 and 13 may be performed in exactly the same manner. Completed gusset bag 1
Has a form without only the bottom joining line 6.

The manufacturing method using the one member 50 can further reduce the cost and improve the productivity.

The gusseted bag 1 shown in FIG. 1 is merely an example, and various modifications are possible. For example, the lid 8
If not provided, the same two members may be prepared in the manufacturing method. Also, the opening / closing mechanism of the lid 8 is the button 9
It is not necessary to use a and 9b, and any fasteners, hook-and-loop fasteners, magnets or the like may be used.

[0032]

As described in the foregoing, according to the invention of claim 1 Symbol placement, most cases of simple form, may be prepared two members of the same shape and size, the joining operation is significantly Because of the simplification, the cost can be reduced and the productivity is remarkably improved.

Further, according to the invention of claim 2 Symbol placement, merely needs to provide a single member, it is possible to further reduce costs and improve productivity.

Further, according to the invention of claim 3 , the joining work is simplified.

[Brief description of drawings]

FIG. 1 is a perspective view of a gusseted bag according to an embodiment.

FIG. 2 is a plan view showing two members prepared in the method for manufacturing the same gusseted bag.

FIG. 3 is a plan view of two members superposed in the method for manufacturing the same gusseted bag.

FIG. 4 is a side view showing a state in which two members are overlapped and one end edge thereof is joined by welding in the method for manufacturing the same gusseted bag.

FIG. 5 is a perspective view of an internal insertion type in which two members are superposed and joined to each other in the method for manufacturing the gusseted bag.

FIG. 6 is a partial side view showing a state in which an internal insertion mold is inserted into and abutted against what is formed by joining two members overlapping each other in the method for manufacturing the same gusseted bag.

FIG. 7 is a side view showing a molding tool that accommodates the one in the state of FIG. 6 in the method for manufacturing the same gusseted bag.

FIG. 8 is a cross-sectional view of a molding tool that accommodates the one in the state of FIG. 6 in the method for manufacturing the same gusseted bag.

FIG. 9 is a plan view of one member that is folded and overlapped in another manufacturing method.

FIG. 10 is an exploded perspective view showing members constituting a gusseted bag according to a conventional example.

FIG. 11 is an exploded perspective view showing members constituting a gusseted bag according to another conventional example.

[Explanation of symbols]

1 gusseted bag 2 front 3 back 4 gusset 5 Side joining line 6 Bottom joining line 7 diagonal joining line 8 lid 12,13 Two members 30 Internal insertion type 40 Lower mold 45 Top plate 50 1 member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-312750 (JP, A) JP-A-54-46673 (JP, A) JP-A-1-202429 (JP, A) JP-A-54- 74171 (JP, A) Actual development 2-43242 (JP, U) Actual development Sho-56-107334 (JP, U) Actual development 6-80651 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65D 30/20 B31B 31/28 B31B 31/44

Claims (3)

(57) [Claims] 1. A front member and a back member, which are superposed on each other, are joined to each other at one end edges thereof to the vicinity of both corners.
At both corners, diagonally join each other up to the edge that intersects the edge, insert a rectangular internal insertion mold with a thickness equivalent to the gusset into this joined product, and join this internal insertion mold Abut against the line, align the joining line other than the corner with the edge of the internal insertion mold that faces the joining line, shift one member along the side surface of the internal insertion mold, and in this state both end edges of one member A method for manufacturing a gusseted bag, characterized in that the gusseted bag is joined to each other and the portions of the other member facing the both edges near the both edges. 2. A front member and a back member, which are folded back and overlapped with each other, are diagonally joined to each other at both corners of a folding line from the folding line to an edge intersecting the folding line, and this joining is performed. Insert a rectangular-shaped internal insertion mold with a thickness equivalent to the gusset into it, and abut this internal insertion mold on the fold line, and align the fold line with the edge of the internal insertion mold facing the fold line. , The one piece sandwiching the folding line is displaced along the side surface of the internal insertion mold, and in this state, both end edges of the one piece and the portion near the both end edges of the other piece facing the both end edges are joined to each other. A method for producing a characteristic gusseted bag. 3. The one member or the one piece, which is displaced along the side surface of the internal insertion mold, is set in a lower mold having a concave sectional shape, and the one member or the one piece is set to the lower mold. Between the both inner side walls and both side surfaces of the internal insertion mold, and in this state, weld one end of one member or one piece and the other member or a part near the end edge of the other piece to the upper top plate. The method for manufacturing a gusseted bag according to claim 1 or 2 , characterized in that.