JPH0221804A - Bag and the like and manufacture thereof - Google Patents

Abstract

PURPOSE:To enable the formation of a storage part to the predetermined thickness by connecting the opposite edges of a pair of formed parts made through the shallow drawing process of an artificial leather with high-frequency welding using a strip-shaped connection aid piece comprising an artificial leather. CONSTITUTION:Formed parts 2an and 2b are molded through the drawing of both sides and bottom of a bag body 1 split with a vacuum forming process. The formed parts 2an and 2b are so positioned as to be opposite to each other at the predetermined interval corresponding to the thickness of the bag body 1, and a strip-shaped connection aid piece 3 comprising an artificial leather is laid along the external side of the opposite portion. Then, the electrode 5 of a high-frequency welder is mounted internally via an upper opening, while an electrode 6 is made in contact with a lower side for applying electric power, thereby welding the overlapped portion of the formed parts 2a and 2b, and the connection aid piece 3. According to the aforesaid construction, the overlapped portion is completely welded and integrated with each other. As a result, a welded part 4 having a thickness substantially equal to the width of the formed parts 2a and 2b, and the connection aid piece 3 is formed and a sturdy bag body 1 can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to bags, particularly various bags made from synthetic leather, and a method for manufacturing the same. A pair of molded parts constituting the storage part is formed by using the above method, and these molded parts and a separately formed connecting auxiliary piece made of synthetic leather are integrally molded by high frequency welding, thereby producing bags and the like that can have arbitrary thickness. This is the manufacturing method.

[Conventional technology]

BACKGROUND ART Bangs 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.

Most of these bags are made by cutting material sheets made from natural leather or synthetic leather to create a back plate and bottom plate that are integrally connected to the front plate and lid that make up the bag.

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

Therefore, the applicant used vacuum forming to form a pair of molded parts in which side edges of the same width were integrally erected along three sides of a sheet material made of synthetic leather.

A method for manufacturing bags in which a storage part is formed by overlapping and abutting a portion of the tip edges of the side edges of each molded part and then integrally joining the overlapping parts by high frequency welding was completed.

By this method, in the bag manufacturing process.

Since the conventional process of sewing the structural members together using a sewing machine was omitted, bag production efficiency was significantly improved.

[Problem that the invention seeks to solve]

In the manufacture of bags, synthetic leather has many advantages over natural leather, such as easier raw material availability, better processability, and lower prices. It is often used in bags that are required to be small and keep costs low.

However, the manufacturing of bags using synthetic leather.

As described above, the bag is divided into several constituent members in advance, these constituent members are formed by drawing, and then these are integrally connected by high frequency welding.

However, when forming component parts, especially storage parts, by drawing a material sheet made of synthetic leather, there is a natural limit to the depth of drawing, and the deeper the drawing, the more unreasonable tension is placed on the synthetic leather material. As a result, it has been found that to a certain extent, the sheet will break, and even if it does not break, the resulting molded part will have wrinkles, causing problems in the finished product.

Moreover, since the edges of the members that constitute the pair of front and rear storage sections are simply connected to each other, the thickness of the storage section is limited depending on the depth of the drawing, resulting in a thin bag in the storage section. It has also been found that it is technically difficult to manufacture large bags with a large capacity.

[Means for solving problems]

In view of the problems in manufacturing bags made from synthetic leather, this invention has been made through intensive research to manufacture not only small bags but also large bags using high frequency welding. Result 2: We developed large bags made from synthetic leather and a method for manufacturing them.

That is, in the first invention, a pair of molded parts constituting the storage section of a bag is constructed by relatively shallow drawing processing of sheet-like synthetic leather, and the opposing edges of the pair of molded parts are formed by combining the two molded parts. These bags are characterized in that belt-shaped connecting auxiliary pieces made of leather are integrally joined by high-frequency welding, and the storage portion is formed to a predetermined thickness.

In addition, the second invention involves forming a pair of molded parts constituting the storage section by drawing a material sheet made of two synthetic leathers, and facing each other with a predetermined interval between the molded inner surfaces of the obtained molded parts. At the same time, the edges of the two belt-shaped connecting auxiliary pieces made of synthetic leather are overlapped and brought into contact with the edges of the opposing molded parts, and each contact part is high-frequency welded, whereby the pair of molded parts and the belt-shaped This method of manufacturing bags is characterized by integrally joining connecting auxiliary pieces to form a storage portion having a required thickness.

The bags of the present invention include a pair of molded parts made of synthetic leather, in which band-shaped side edges of the same width are integrally erected on three sides of the bag storage area by drawing process, and a pair of molded parts made of synthetic leather. It consists of a band-shaped connecting auxiliary piece for interconnecting the opposing side edges of the molded parts, and the material sheets used for the molded parts and the connecting auxiliary pieces are made to resemble natural leather in appearance and feel. Synthetic leather made in a broad sense, or
Examples of synthetic leather include so-called vinyl leather, which is made by applying a vinyl chloride resin sheet to fabric, artificial leather, which is made by coating non-woven fabric with resin, and narrowly defined synthetic leather, which is made by coating and impregnating fabric with resin. Those with a layer of artificial leather formed on the back side also belong to the scope of the synthetic leather of this invention, and the molded parts and the connecting auxiliary pieces basically use the same synthetic leather.

These synthetic leathers are molded by vacuum molding or the like, and the molded parts and the band-shaped connecting auxiliary pieces are welded together using a high-frequency welder.

The band-shaped connection auxiliary piece connects the opposed molded parts and constitutes a so-called gusset. Therefore, the width is arbitrarily selected depending on the contents to be stored in the bag.

The shape may be plate-like or may have zigzag folds formed in the longitudinal direction.

[For production]

In the bags of the present invention, the pair of molded parts constituting the storage section and the belt-shaped connecting auxiliary piece for connecting these molded parts are made of synthetic leather, so these parts can be easily integrated by high-frequency welding. can be converted into

Moreover, since the material constituting the molded parts is synthetic leather, they can be molded by shallow drawing using vacuum forming, making it possible to manufacture various bags very efficiently.

On the other hand, in the manufacturing method of the present invention, since a pair of molded parts are connected by a belt-shaped connecting auxiliary piece, when molding the molded parts, the side edges formed on the two pieces of the material sheet are performed by relatively shallow drawing. By freely selecting the width of the strip-shaped connecting auxiliary piece, the thickness of the bags to be manufactured can be freely changed.

In order to integrally join the molded parts and the connecting auxiliary piece by welding using a high-frequency welder, one piece is placed in the storage section consisting of the facing molded parts and the band-shaped connecting auxiliary piece that connects the molded parts. Set the electrode and connect the other one from outside.
in a short period of time by pressing individual electrodes together and applying high-frequency voltage.

Moreover, it can be welded to almost the same thickness as a single sheet.

〔Example〕

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

FIG. 1 is a perspective view showing an example of a storage section constituting the bags of the present invention, and shows a bag main body 1. FIG.

A pair of molded parts 2a and 2b obtained by vacuum forming synthetic leather material sheets and having side edges of the same width integrally erected on three sides, and a band shape for connecting these molded parts 2a and 2b. It is composed of a connecting auxiliary piece 3.

The molded parts 2a and 2b are both formed by drawing the bag body 1 with both sides and the bottom divided by the vacuum forming process described above.

The upper part is not drawn and formed as the opening of the bag.

These molded parts 2a and 2b are 1, for example, molded part 2.
Figure 2 shows a single unit and each part 2a before welding,
'lb and the third set showing the condition of the connection auxiliary piece 3.
As is clear from the figure, the side edges of the pair of molded parts 2a and 2b are not directly joined to form the thick part of the bag, that is, the storage part, but the depth of the drawing of each molded part 2a and 2b. The thickness of the bag is determined by adding the welding allowance to the sum of the width of the side edge formed by the auxiliary connecting piece 3 and the width of the strip-shaped connecting auxiliary piece 3.

Therefore, the total width of the side edges of the molded parts 2a and 2b is naturally determined by shallow drawing under the width plate of the thick part of the bag.

Thus, the molded parts 2a and 2b are made to face each other at a certain distance so as to form a storage part of the bag body 1, and are integrated by overlapping and joining a connecting auxiliary piece 3 made of synthetic leather from the outside. 4.
indicates a welded part that is integrated by this welding.

Manufacture of the bag body 1 with such a configuration is as follows.

As shown in FIGS. 3 to 5.

That is, as shown in FIG. 3, the molded parts 2a, 2
b are faced to each other with a constant interval corresponding to the thickness of the bag body 1, and the connection auxiliary piece 3 is placed along the outside of the spaced part, and the high-frequency welder is inserted from the upper opening as shown in FIG. The overlapping portions of the molded parts 2a, 2b and the connecting auxiliary piece 3 are welded by attaching an electrode 5 inside the molded part and applying electricity to the electrode 6 of a similar high-frequency welder from below.

By welding using a high-frequency welder using such electrodes 5 and 6, the overlapping parts are completely welded and integrated, and the thickness is substantially equal to the width of the molded parts 2a, 2b and the connecting auxiliary piece 3. It is possible to obtain a robust bag main body 1 that retains a certain shape.

In this case, the sheet made of synthetic leather used as the connecting auxiliary piece 3 is a sheet with a smooth plane, but the connecting auxiliary piece 3a has zigzag folds 7 formed in the vertical direction as shown in FIG. By similarly joining a pair of molded parts via this connecting auxiliary piece 3a, the connecting auxiliary piece 3a expands and contracts like an accordion, allowing the thickness of the bag to be freely changed. The bag can be easily stored and taken out regardless of the size of the contents stored in the bag, and the bag itself can be made compact when no contents are stored.

〔Effect of the invention〕

The bags of this invention have a pair of shallowly drawn molded parts made of 9 synthetic leather facing each other.

The side edges of opposing molded parts are integrally connected by high-frequency welding of belt-shaped connecting auxiliary pieces made of synthetic leather. By appropriately selecting the width of the auxiliary piece, it is possible to freely change the volume of the storage section of the resulting bags.

Therefore, compared to the case where the storage part is made thicker by forcibly deep drawing the molded parts, the synthetic leather itself is not damaged at all during the drawing process such as vacuum forming. This makes it possible to obtain a good-looking bag that has the following advantages.

On the other hand, in the bag manufacturing method of the present invention, the molded parts and the connecting auxiliary pieces are joined by high frequency welding, not by sewing, so that the production efficiency of bags can be greatly improved. Even if the same molded part is used, it is possible to form a storage section with any thickness by using band-shaped connecting auxiliary pieces with two different widths, so various types of component members can be prepared in advance, Compared to the conventional manufacturing method for bags that required storage, the number of component parts is greatly reduced, inventory management, etc. is easier, and high-quality bags are provided at low prices. It has many advantages, such as the ability to

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a storage section constituting the bags of the present invention, Fig. 2 is a perspective view of molded parts constituting the bags of the present invention, and Fig. 3 is a connecting auxiliary piece attached to each molded part. Fig. 4 is a partially cutaway vertical sectional view showing the state when the high-frequency welder is installed in the manufacturing process of bags, and Fig. 5 is a perspective view showing the state before welding along the sides. Fig. 5 is a perspective view showing the state before welding with the high-frequency welder. FIG. 6 is a partially cutaway longitudinal cross-sectional view showing the state of FIG. 1...Bag body 2a, 2b...Molded parts 3.3a...Connection auxiliary piece

Claims (4)

[Claims] (1) A pair of molded parts that make up the storage section of the bag,
A sheet of synthetic leather is constructed by a relatively shallow drawing process, and a band-shaped connecting auxiliary piece made of synthetic leather is integrally joined by high-frequency welding between the opposing edges of the pair of molded parts, and the storage section is constructed. 1. Bags characterized by being formed to a predetermined thickness. (2) The bags according to claim 1, wherein the molded part is formed by integrally erecting side edges of the same width along three sides of a synthetic leather sheet. (3) A pair of molded parts that make up the storage section are formed by drawing a material sheet made of synthetic leather,
The molded inner surfaces of each of the obtained molded parts are made to face each other at a predetermined interval, and at the edges of the facing molded parts,
By overlapping and abutting the edges of the belt-shaped connecting auxiliary pieces made of synthetic leather, and by high-frequency welding each contact part, the pair of molded parts and the belt-shaped connecting auxiliary piece are integrally joined, thereby achieving the required thickness. 1. A method for producing bags, which comprises molding a storage section having a storage section. (4) The method for manufacturing bags according to claim 2, wherein the drawing process is a relatively shallow drawing process by vacuum forming.