JPH0221803A - Bag manufacturing method - Google Patents

Abstract

PURPOSE:To form a storing part by making a pair of formed parts having a side end integrated with three sides of a sheet material comprising an artificial leather and then overlapping the leading ends of each formed part for contact with each other and monolithically bonding the leading ends with a high-frequency welding process. CONSTITUTION:A formed part 2 is made in such a way that a side end part 4 having a width about a half of the thickness of a desired bag and a welding margin is integrated with three sides of right, left and bottom along a front plate 3 constituting a bag and the like, except for an upper side for taking in and out an article. A formed part 5 is also made almost similarly in such a way that a side end part 7 having a width and a welding margin similar to the aforementioned is erected along three sides along a rear plate 6 opposite to the front plate 3. The leading edge of the side end part 4 of the formed part 2 is made in contact with the leading end of the side end part 7 of the formed part 5 via a pertinent overlapped width and the overlapped contact part 8 is welded. In this case, the electrode 10 of a high-frequency welder is inserted through the opening of an upper side comprising the formed parts 2 and 5, and electrodes 11 to 13 in a pressed mode are made in contact with the external surfaces of remaining three sides for a flow of electric current under high-frequency voltage. As a result, the artificial leather of the overlapped contact part 8 is heated and welded for integration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to bags, and particularly to methods for manufacturing various bags using synthetic leather as a raw material.

[Conventional technology]

BACKGROUND ART Bags such as suitcases, Boston bags, gear bags, handbags, and camera cases can be broadly classified into two types: those using natural leather and those using synthetic leather.

The front panel of most of these bags is made by cutting sheets of material made from natural leather or synthetic leather.

The back plate and bottom plate are integrally connected to the part that becomes the lid.

It is manufactured by forming each part, such as the left and right side plates, and sewing these parts together with a sewing machine.

[Problem that the invention seeks to solve]

As mentioned above, when manufacturing conventional bags, the bag is divided into several component parts, each component is cut, and then
These constituent members are sewn together using a sewing machine or are integrally connected using an adhesive to form a bag.

Therefore, as the number of members constituting the bag increases, sewing, applying adhesive, and attaching the bag require more labor and time.

On the other hand, reducing the number of components that make up a bag greatly contributes to improving production efficiency and reducing product costs, but if you try to manufacture a bag with fewer components, it will affect the shape, appearance, and strength of the bag. There is a problem in that it is difficult to obtain an ideal product.

[Means for solving problems]

This invention is the result of intensive research up to the current situation.

Focusing on the many advantages of synthetic leather, which includes easy availability of raw materials, good processability, and quality similar to natural leather, we will efficiently produce various bags using synthetic leather as a material sheet. The method was developed.

Specifically, this invention involves molding a pair of molded parts in which side edges are integrally erected along three sides of a sheet member made of synthetic leather, and then The storage portion is constructed by overlappingly abutting the two ends and integrally joining the tip edges that are in overlapping contact together by high frequency welding.

The synthetic leather used in this invention refers to synthetic leather in a broad sense that is made to resemble natural leather in appearance and feel.Synthetic leather includes so-called vinyl leather, which is made by applying a vinyl chloride resin sheet to fabric. Artificial leather made of non-woven material coated with resin.

Synthetic leather in a narrow sense, which is fabric coated and impregnated with resin, is included, and other natural leather with an artificial leather layer formed on the back side also belongs to the scope of synthetic leather of the present invention.

These synthetic leathers are molded using a relatively shallow drawing process such as vacuum forming.

The molded parts are joined by welding using a high-frequency welder.

[For production]

The molded parts used to manufacture the bags of this invention are attached to the other three sides of the periphery of the front plate and back plate, which constitute thick ordinary bags, except for the upper side for taking in and out the contents. , the thickness of the bag including the welding allowance is a pair of molded parts with side edges each having a width of half y' erected and tightened, and the tip edge of the side edge of this molded part The hang is formed by overlapping and abutting and high-frequency welding.

To weld and integrate a pair of molded parts, one electrode is set inside a bag formed by fitting the leading edge of the side edge of one molded part to the leading edge of the other side edge. By pressing another electrode from the outside of the overlapping contact portion of the leading edge and applying a high frequency voltage, welding can be achieved in a short time and to almost the same thickness as a single sheet.

Since the molded parts used in this invention are held in a predetermined shape in advance by molding means such as vacuum forming, the bag obtained using the same also has a shape that conforms to the shape of the contents to be stored. Furthermore, since the welded portion is formed in a portion of the bag thickness that has little effect on the appearance of the bag, it is possible to obtain a bag with an excellent external shape.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The bag 1 of the present invention is composed of a molded part 2 obtained by vacuum forming a sheet member made of synthetic leather, and a similar molded part 5.

The molded part 2 has a width of approximately half the thickness of the bag to be obtained and a welding margin on three sides of the periphery of the front plate 3 constituting the bag, excluding the top edge for taking in and out contents, left, right, and bottom. Similarly, the other molded part 5 also has three sides of the periphery of the back plate 6 facing the front plate: left, right, and bottom excluding the top edge. To,
A side edge portion 7 having a width approximately half the thickness of the bag to be obtained and a welding margin is integrally erected.

In addition, in the example, a welding allowance is formed on the side edges of both molded parts 2 and 5 so that they have the same width, but a welding allowance is formed only on the side edge of one of the molded parts, and the side edge The width of the part may be different from that of the other molded part. However, 3
It is desirable that all the side edges formed on the sides have the same width, and the vacuum forming for forming these side edges is performed by relatively shallow drawing.

Therefore, the molded part 2 has the tip edge of the side edge 4
The tip edges of the side edges 7 of the opposing molded parts 5 are brought into contact with an appropriate overlapping width, and the overlapping abutting parts 8 are welded. As shown in FIGS. 3 and 4, high frequency welding Insert the electrode 10 from the opening on the upper side formed by the molded parts 2 and 5, and insert the electrode 11 and 12 from the outside of the remaining three sides.
and 13 are brought into contact with each other in a pressed state and energized to apply a high frequency voltage, the synthetic leather of the overlapping contact portion 8 is heated and welded to form a single sheet as shown by reference numeral 9 in FIG. 5. , which are integrated without any difference in level.

〔Effect of the invention〕

The method for manufacturing bags according to the present invention involves forming a pair of molded parts each having side edges erected along three sides of a sheet member made of synthetic leather, and overlapping and abutting the leading edges of the side edges. These parts are integrally joined by high frequency welding to form the storage section.

Therefore, compared to the conventional manufacturing method of bags, cumbersome operations such as cutting, sewing, and gluing of sheet members are omitted, and the molded parts are essentially molded and the resulting molded parts are processed by high frequency processing. Excellent bags can be obtained in a short time through two simple steps of welding, which greatly simplifies the two work steps and enables manufacturing suitable for mass production. By performing a relatively shallow drawing process by molding.

It is possible to provide bags of excellent quality at low prices, as it can be molded without damaging the synthetic leather material, and is particularly effective in manufacturing camera cases and small bags for formal wear. It is something.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a bag obtained by the present invention, and FIG. 2 is a perspective view of each molded part. 3 to 5 show the manufacturing process of the bag according to the present invention, and FIG. 3 is a perspective view showing welding of molded parts;
Figure 4 is a vertical cross-sectional view showing the state of the molded parts before welding.
FIG. 5 is a longitudinal sectional view showing the state of the molded parts after welding. ■... Bag 2, 5... Molded half 3... Front plate 4, 7... Side edge 6... Back plate 8...
・Overlapping part 9...Welding part 10, LL 12.13...Electrode Fig. 1 Fig. 2

Claims (3)

[Claims] (1) After molding a pair of molded parts with side edges integrally erected along three sides of a sheet member made of synthetic leather, the leading edges of the side edges of each molded part are overlapped and abutted, A method for manufacturing bags, characterized in that a storage section is constructed by integrally joining the overlapping and abutted leading edges by high-frequency welding. (2) The method for manufacturing bags as set forth in claim 1, wherein the molding of the molded parts is a shallow drawing process using vacuum forming. (3) The method for manufacturing bags according to claim 1, wherein the side edges all have the same width.