JP3186595B2 - Manufacturing method of gusseted 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 such as a handbag or a bag having a gusset.

[0002]

2. Description of the Related Art As shown in FIG. 4, when forming a gusset portion on a bag such as a carrying bag or a bag, both sides of the bottom of the bag formed in advance into a bag shape have a length corresponding to the width L of the gusset portion. A triangle S is formed by pinching the bottom, and the bottom of the triangle S is joined by sewing or welding to form a corner of the bag body,
The triangle S is bent upward or downward and joined along the side gusset or the bottom of the bag. In addition to the above, fabrics forming side gussets and side portions of the bag body are separately formed, and the respective fabrics are joined to produce a gusseted bag body.

[0003]

However, according to the above-mentioned prior art, the gusset is formed by processing the cloth for forming the bag in advance into a bag shape and then forming the gusset separately or by forming the side gusset. Increases the number of work steps for forming a gusset part in the bag and the number of parts constituting the bag, such as joining the fabrics obtained by cutting the side parts individually, making the sewing of the bag complicated and costly Had been invited up.

[0004]

Means for Solving the Problems The inventors of the present invention have made intensive studies in view of such circumstances, and as a result, have obtained a belt forming a bag.
Fold the dough in the shape of a circle around the bottom of the bag
The folded part of the dough folded and folded in half is half the gusset width
Fold it further toward the top of the bag by the width corresponding to
Fold and join both sides of the folded fabric
The invention was completed by turning over the ground .

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The fabric of a bag used in carrying out the present invention can be used as long as it is a flexible material.
Various materials such as woven fabric, non-woven fabric, vinyl fabric, and leather can be used.

[0006] In manufacturing the gusseted bag of the present invention, various methods such as suturing, bonding and welding can be used for joining the bags.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to FIGS. A bag 1 made of a fabric made of a flexible synthetic fiber woven fabric has a side portion 2, a side gusset portion 3 and a bottom portion 4.
And an opening 5 is formed in the upper part.

The method for manufacturing the gusseted bag of the present invention is as shown in FIG. First, the expanded band-shaped cloth 6 [(1) in FIG. 1] is folded in two around the center in the longitudinal direction [(2) in FIG. 1]. Then, the folded portion 7 is folded in two toward the upper side ((3) in FIG. 1), and the folded width L1 of the folded portion 7 at this time.
Corresponds to half the gusset width of the bag 1.

[0009] Then, sewn fabric 6 on both sides of the overlap portion 8 folded [labeled 1 (4)], Turn the dough 6 by inverting the upper part is open [in Fig. 1 (5) (6 )] Finally, when the opening 5 is expanded and raised, the bag 1 is completed [(7) in FIG. 1].

[0010] In the bottom side of the bag body 1 of the gusseted portion 3, as shown in FIGS. 2 and 3, folding unit 9 became a folding width L1 of the folded portion 7 and the height T were right-angled isosceles triangle
Is formed by being folded into the inside of the bag body from both sides of the bottom portion 4 toward the top, and a width equivalent to twice the folded width L1 of the folded portion 7 is the width of the side gusset portion 3. .

In the above embodiment, the fabric 6 of the bag body 1 is made of synthetic fiber fabric. However, the fabric 6 may be made of a flexible fabric that can be turned over after the overlapping portion 8 is sewn. The dough 6 can be used. In addition, although the bag 1 is manufactured by sewing the overlapping portion 8 of the folded fabric 6, the overlapping portion 8 may be joined by a currently known method such as bonding or welding.

[0012]

According to the present invention, a bag having a gusset portion can be manufactured at once by simply joining both sides of the folded fabric straightly, so that a sewing operation for forming the gusset portion is achieved. The steps can be omitted, and the production of the gusseted bag can be significantly simplified. Further, according to the method of the present invention, a bag having a gusset portion can be formed from a single band-shaped material, so that the step of cutting the bag material can be greatly simplified, and the number of parts of the bag can be reduced. It is possible to mass-produce this kind of bag at low cost.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a procedure for manufacturing a gusseted bag of the present invention.

FIG. 2 is an enlarged view of a main part of the gusseted bag of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory view showing a conventional gusseted bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag body 2 Side part 3 Side gusset part 4 Bottom part 5 Opening part 6 Fabric 7 Folding part 8 Overlapping part 9 Folding part

Claims (1)

(57) [Claims] 1. A band-shaped fabric forming a bag is folded in two around a bottom portion of the bag, and the folded portion of the folded fabric is further folded by a width corresponding to half the gusset width. A method for producing a gusseted bag, characterized in that the bag is turned upside down, folded in half, joined on both sides of the folded fabric, and turned over.