JPS6311223B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing handbags, and more particularly to a handbag with improved strength at the handle portion of the bag.

Recently, with the development of large-scale retail businesses such as supermarkets and department stores, handbags made of thin synthetic resin films have come to be used as packaging materials, and the demand for handbags has increased. .

However, these handbags are required to have sufficient strength to withstand the weight of the products they are stored in, and in particular, the hanging portion of the bag is required to have high strength.

In the past, various methods have been proposed to meet these demands, but they have had drawbacks such as increased processing materials and complicated manufacturing processes, making them less practical.

An object of the present invention is to provide a method for manufacturing handbags that eliminates the above-mentioned drawbacks.

The method for producing handbags of the present invention involves supplying a synthetic resin film in which both longitudinal ends of a flattened tubular synthetic resin film are folded inward; Step of cutting one of the folded folds with a cutter, (b) inserting a hard plate into both folded parts of the supplied synthetic resin film, and leaving a certain gap between the parts of the synthetic resin film where the hard plate was inserted. The welded parts formed by a set of two welded parts are raised diagonally from the edge of the folded part in a widening shape to form an inverted V-shape, or diagonally descended to form a straight V-shape. , and a step of heat-sealing the folded portion so that one of the welded portions of one set is continuous with the welded portion of the other set to form a chevron-shaped or V-shape, and (c) tearing the folds of the supplied synthetic resin film. The edge of the folded part on the folded or torn side,
After performing a step of longitudinally punching out the synthetic resin film including a part of the edge at the edge between the welded parts of the set, in an arbitrary order, at the outer part of each of the set of welded parts. It consists of heat-sealing and cutting a synthetic resin film in a direction perpendicular to its longitudinal direction.

The method for manufacturing handbags according to the present invention includes various embodiments, and the order of the above steps (a) to (c) does not matter. Therefore, step (a) may be performed before or after steps (b) and (c), or may be performed in the middle of both steps. Similarly, the order of steps (b) and (c) is also arbitrary. In addition, when heat sealing is performed to form a weld, the inclination angle should be set to 40
By setting the angle to 50°, preferably about 45°, a hand bag with excellent strength at the hanging portion can be obtained.

As the synthetic resin film used in the present invention, polyethylene such as high-density polyethylene is preferred because it has sufficient strength, but other synthetic resin films may be used in consideration of the use of handbags. You can also.

Next, the present invention will be explained with reference to the drawings. Synthetic resin films such as polyethylene are usually manufactured in the shape of a long tube, and are stored by being folded flat and wound up on pinch rolls or the like. When applying the synthetic resin film to the present invention, when winding it onto a winding roll,
By passing the synthetic resin film through zones of plate-like bodies disposed on both sides in the longitudinal direction, both ends of the synthetic resin film in the longitudinal direction are folded inward and wound up. FIGS. 1a and 1b show the tubular synthetic resin film in a folded state with both ends in the longitudinal direction folded inward.

Synthetic resin film 1 wound on a storage roll
As shown in FIG. 2, the materials are sequentially supplied to the production line via the feeding device 2. In that case, the synthetic resin film supplied to each process remains stationary until the work in that process is completed, and then moves toward the next process. The operation of intermittently supplying the synthetic resin film as described above can be performed automatically by operating a control device equipped with a printing mark detection device or the like.

In the embodiment shown in FIG. 2, the synthetic resin film 1 is first fed to the tearing device 3, and as it passes through the fixed zone of the cutter, the fold at the fold at one longitudinal end is cut. It can be done. This work is done continuously. Next, the synthetic resin film is sent to a punching process, and its movement is temporarily stopped at the punching device 4. Here, a portion of the edge of the film on the side of the torn crease is punched out. Then, if necessary, compressed air is sent to blow off the punched film waste. In this way, the handle portion of the bag is formed.

After the hanging portion is formed, the synthetic resin film is sent to a heat sealing process. At this time, hard plates such as metal plates are inserted into the folded portions on both sides of the synthetic resin film. This operation is performed by fixing the hard plate at a predetermined position and automatically inserting the hard plate into the folded part of the synthetic resin film when the synthetic resin film arrives there. It is also possible to adopt an operation such as inserting a hard plate. In this case as well, the synthetic resin film is stopped at an appropriate position by the operation of the control device 6 described above. Heat sealing is performed by a sealing device 5. Heat sealing is performed on both folded parts, and the welded part formed in one of the folded parts punched out as described above reinforces the handle part, and the welded part formed in the other folded part strengthens the bottom of the bag. Used for forming and reinforcing. That is, when the bag is used, the fold-in part opens to form a rectangular bottom, and the welded part is located on the short side of the rectangular bottom to stabilize the bottom. This heat sealing may be performed on one side of the folded portion, but workability can be improved by performing both at the same time. Heat sealing is a process in which a set of two welds are formed on a synthetic resin film at regular intervals, forming a straight line that ascends or descends diagonally from the edge of the folded part. Let's do it. FIG. 3 shows an embodiment of the present invention, in which a set of two welded parts 20a, 20
b is obliquely raised from the edge of the folded portion to form an inverted V-shape, or diagonally descended to form a V-shape. The angle of inclination of the linear weld in this case should be between 40 and 50 degrees, preferably about 45 degrees. It is important to keep the inclination angle of the welded part within this range, especially in the folded part on the side where the above-mentioned punching process is performed to form the hanger part of the bag. Adjust the angle of inclination of the welded part to 40~
If the angle is 50°, when used as a hand bag, the hanging part of the bag is reinforced by forming the welded part, even though it is originally a very thin band of synthetic resin film. (See Figure 4). Therefore, even when storing and carrying extremely heavy items, the hanging handle will not be damaged.

The synthetic resin film is then sent to a side sealing device. The side seal device includes a seal bar 7 for heat sealing as shown in FIG.
and a cut bar 8 for cutting at the sealed portion. The synthetic resin film sent to the side sealing process is sent to a printing mark detection head 14 and a printing mark detection device 1.
A sending device 10 receiving instructions from a control device such as No. 5
It is sent to an accurate position and comes to rest. Next, the synthetic resin film is sealed at predetermined intervals in a direction perpendicular to its longitudinal direction, and then cut at the welded portions. The cut portions 22 form both edges of the handbag. In addition, in the figure, 9 is a seal conveyor device, 11 is a heater disconnection detector, 1
2 is a main control box; 13 is a synthetic resin film take-up conveyor device; 16 is a detection head for the synthetic resin film wound on a storage reel; and 17 is an automatic stop device for ending the supply of the film. When welding and cutting the side edges of the handbag using the side sealing device, the synthetic resin film is sent to the correct position and stationary by the control device, so as shown in Fig. 3, , 2 above
The welded parts of one set of books are included between the edges of both sides of the bag formed by cutting. In this case, in the embodiment, a pair of welded parts in the folded parts on both sides are formed at symmetrical positions, but the welded parts on the side of the folded part that will become the hanging part by punching are closer to the center than the cut part 22. It is also possible to move the two welds closer together by moving it to the side. In this way, the handle portion has sufficient strength and stability, making it easy to use as a handbag.

In addition, in the embodiment shown in FIG.
The shape is designed to improve the workability of heat sealing. in this case,
A cut portion 22 is formed between the continuous welded portions as shown in the figure to produce the intended handbag.

In the method of the present invention, the punching process for forming the hanger part is incorporated into the production line, so there is no need to stack hundreds of bags and then perform the punching process after manufacturing the bags, as in the conventional method. Further, since the synthetic resin film supplied as a raw material has its longitudinal ends folded inward in advance, the bag manufacturing process is simplified and the bag is highly practical. In this case, the manufacturing process can be made more efficient by simultaneously performing a heat sealing process for forming a set of welded parts on the folded parts on both sides of the film in the manufacturing line.

In the handbag obtained by the present invention, the stress applied to the handle part is evenly distributed to the four welded parts that are the starting points of the handle part, so that the weight of the stored item is reduced at each part. Only 1/4 of it becomes a load. Moreover, the welded part is in the direction of the hanging hand.
Since it is formed with an inclination that closes at an angle of 40 to 50 degrees, it exerts a reinforcing effect on the hanging part. In addition, since the welded part and the side seal part have a double structure with a folded synthetic resin film, both sides of the opening of the bag are reinforced, making it easy to take items in and out. It is possible and convenient. This effect is greater than when folding is done on the outside because the fold is done on the inside and the starting point of the hanger is on the inside of the bag.

[Brief explanation of the drawing]

FIG. 1 shows the folded state of the synthetic resin film used in the method of the present invention, in which a is a plan view and b is a cross-sectional view. Figure 2 is a sketch of the apparatus used to carry out the method of the invention;
The figure is an explanatory view of the manufacturing process of handbags according to the method of the present invention, and FIG. 4 is an explanatory view of the use state of the handbag obtained by the method of the present invention. 18...Synthetic resin film, 19...Insulating plate,
20a, 20b...a set of welded parts, 21...punched parts, 22...side seal parts.

Claims (1)

[Scope of Claims] 1. After supplying a synthetic resin film in which both longitudinal ends of a flattened tubular synthetic resin film are folded inward, (a) the folds folded inward of the supplied synthetic resin film are Step of cutting one side with a cutter, (b) inserting a hard plate into both folded parts of the supplied synthetic resin film, and forming the parts of the synthetic resin film at regular intervals where the hard plate is inserted. One set of two welded parts should be arranged such that the two welded parts rise obliquely from the edge of the folded part to form an inverted V-shape or diagonally descend to form a V-shaped straight line. A process of heat sealing the folded part so that one of the welded parts of the set is continuous with the welded part of the other set to form a chevron or V shape, and
(c) The edge of the folded part on the side where the fold of the supplied synthetic resin film should be torn or has been torn, and the edge between the pair of welded parts,
After performing the step of punching out the synthetic resin film including a part of the edge in the longitudinal direction in an arbitrary order,
By heat-sealing the synthetic resin film in the direction perpendicular to the longitudinal direction on the outer side of each of the welded parts of the set and cutting it, the welded parts are raised obliquely from the edge of the folded part in a mutually expanded shape. It forms an inverted V-shape or a straight line that slopes down to form a V-shape, and one of the welded parts of one set is continuous with the welded parts of the other set to form a chevron or V-shape. A method of manufacturing a handbag having a starting point on the inside. 2. The method according to claim 1, wherein the welded portion has an inclination angle of 40 to 50 degrees.