JPH0476868B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a bag consisting of an upper edge, a seam, a bag body, and a bottom, the upper edge having a handle opening or a structure equivalent thereto,
The upper edge portion relates to a bag that can be carried by hand and is made of a sheet or film such as plastic film, plastic coated sheet, or plastic laminate sheet, which is continuous with the bag body through a seam.

The present invention also provides a method for manufacturing a bag comprising an upper edge, a seam, a bag body, and a bottom, in which the upper edge is provided with a handle opening or a structure equivalent thereto; The part is continuous with the bag body through a seam, and the bottom of the bag body is provided with a filling means, and is made of plastic film, plastic coated sheet, etc. suitable for transporting heavy objects.
The present invention relates to a method of manufacturing a bag that can be carried by hand and is made of a sheet such as a plastic laminate sheet or a film.

This type of bag is used as a portable bag suitable for transporting products such as chemicals, chemical products, fertilizers, cement, etc., and it can hold approximately 5 to 25 kg regardless of the contents. be.

A drawback of the conventional structure of this type of bag is that when it is in the form of a carrying bag, the strength of the carrying part is weak. In the conventional structure, for example, in the case of a plastic bag, the top edge of the bag is folded back to form a four-layer structure, and then a crossing seam is made to form a handle opening. The seam does not have the strength to withstand the weight of the bag body when it is full.

U.S. Pat. No. 3,974,958 discloses a bag in which the upper edge is reinforced with a hot seam.

European Patent Application No. 0054297 discloses a product in which only the handle opening is reinforced, and the seam part is not reinforced, so the strength is not strengthened that much, and is only about 30% reinforced. It's just that.

Finnish Patent No. 45539 discloses a bag in which a piece of cardboard is used as a handle at the upper edge of the bag.

British Patent No. 1,141,841 discloses a bag in which, like the Finnish patent, a piece of cardboard is used as a handle at the upper edge of the bag.

German Patent Application No. 2 257 667 shows a construction with a seam at the folded upper edge and no filling means at the bottom.

An object of the present invention is to improve the drawbacks of the conventional structure and provide a structurally strong bag for heavy objects.

The object of the present invention is to provide a bag consisting of an upper edge, a seam, a bag body, and a bottom, the upper edge having a handle opening or a structure equivalent thereto,
The upper edge is continuous with the bag body through the seam,
The upper edge is folded back at least once in the longitudinal direction parallel to the seam, and a reinforcing piece is joined to at least the surface of the folded side so as to span the folded upper edge and the bag body. The stripping is achieved by a bag arranged to improve the strength of the seam so as to simultaneously cover at least a portion of the seam and the entire handle opening.

Furthermore, the object of the present invention is achieved by a structure in which reinforcing pieces are joined to both sides of the bag so as to extend over the upper edge and the bag body.

Another object of the present invention is to provide a method for manufacturing a strong bag by reinforcing the upper edge in a simple manner.

The object of the present invention is to join both sides of a bag body to a flat cylindrical web at predetermined intervals to form transverse seams, and then sandwich the seams in the longitudinal direction of the cylindrical web to form a predetermined length. Cutting to size, forming a semi-finished bag consisting of the upper edge, seam, and bag body in this order, folding the upper edge of the semi-finished bag at least once in the longitudinal direction parallel to the seam, A reinforcing piece is joined to at least the surface of the folded side so as to extend from the folded upper edge to the bag body, and at least the folded upper edge and the reinforcing piece are combined to form a five-layer structure, This is achieved by a method of manufacturing a bag, which is characterized in that the bottom of the bag body is sealed, a filling part such as a filling valve is provided therein, and a handle opening is formed through the upper edge and the reinforcing piece.

Furthermore, the object of the present invention is achieved by a manufacturing method in which a reinforcing piece is joined to both sides of the bag so as to extend over the upper edge and the bag body.

The invention provides a number of advantages: the top edge of the bag is significantly strengthened, and the connection between the top edge and the bag body is strengthened by the hot seam and the joining of the reinforcement piece. This joining can be performed, for example, by sewing, snapping, ultrasonic welding, spin welding, heat sealing, gluing, etc. Bonding by gluing is preferred. At this time, glue can be applied both to the reinforcing piece and to the bag side.

Furthermore, since the seam separating the top edge and the bag body is formed before the bag is filled, the bag is completely sealed and no dust is generated.

According to this invention, the reinforcing piece acts as a reinforcing body that connects the upper edge of the bag and the bag body, and also reinforces the seam part between the two, so that the reinforcing piece abuts the entire seam part. This will increase the strength of this area by 25%. This point is not indicated in the aforementioned European Patent Application No. 0054297.

In addition, for example, in the case of a large bag 10 having a filling amount of approximately 10 to 25 kg, the upper edge portion 14 is folded back once as described above, or folded back more than once, and reinforced on one or both sides. The pieces are joined and overlapped in five, six, seven, eight, etc. layers, and the upper edge is extremely strongly reinforced so that there is no risk of the upper edge being torn when the bag is hung. be able to.

In order to further increase the strength, the upper edge of the bag may be made of a material with appropriate strength.

Next, the present invention will be explained in detail with reference to illustrated embodiments.

As shown in FIG. 1, a cylindrical web 100 made of plastic film is a component of the bag according to the present invention, and the web is folded flat. This web is provided with transverse seams 12 that join the front and back surfaces of the bag at predetermined intervals over the entire length in the width direction. Then, the semi-finished bags 11a, 11b are cut into semi-finished bags 11a, 11b of a predetermined length dimension across the seam in the length direction, and each bag has a A seam 12 is provided parallel to one cut edge and inside thereof to join the front and back surfaces of each of the bags. In this way, a semi-finished bag is formed, which consists of the upper edge 14, the seam 12, and the bag body 13 in this order.

As shown in FIGS. 2a and 2b, the web 10
Upper edge 14 (between cut edge and seam 12) of bags 11a, 11b, etc. of each semi-finished product obtained from 0
is folded back once to form overlapping parts 14a and 14b, and one overlapping part 14a is connected to the bag body 13 via the seam 12.

As shown in Figures 3a and 3b, a reinforcing patch 15 is fixed from the upper edge 14 to the bag body 13 by a fixing means such as gluing. The reinforcing piece 15 is attached to one side of the upper edge portion 14 (overlapping portion 14b
It is fixed to one side or both sides, and is extended and fixed to the side of the bag body 13, thus covering the seam 12 and reinforcing it. Reinforcement piece 1
5 is joined to reinforcing the seam 12 partially or over its entire length, and due to the fixation of the reinforcing piece 15, the upper edge 14 is formed by overlapping the film layer and the reinforcing piece at the upper edge. It has a laminated structure of at least five layers, which increases the strength significantly, and furthermore, the connection between the two is reinforced by joining with the bag body 13 side.

The bottom structure of the bag of the present invention is as shown in FIG. 4, and the bottom part 17 is provided with a filling valve 18 or a filling opening. It is closed, and may have a structure that can be opened and closed freely.

The upper edge portion 14 reinforced as described above includes
A handle opening 16 is provided to enable hand-carrying, and this handle opening 16 passes through the upper edge 14 on which the reinforcing piece abuts, and the handle opening is reinforced by the multilayer structure described above.

In addition, for example, in the case of a large bag 10 having a filling amount of approximately 10 to 25 kg, the upper edge portion 14 is folded back once as described above, or folded back more than once, and reinforced on one or both sides. The pieces 15 are joined and overlapped in five, six, seven, eight, etc. layers, and the upper edge 14 is extremely strongly reinforced, so that there is no risk of the upper edge 14 being torn off even when the bag 10 is held up. do not have.

In order to use the bag for heavy objects and to carry the bag for long periods of time, it is desirable that the upper edge portion 14 be made of a reinforced material.

In the bag structure described above, any manufacturing process may be used as long as the upper edge is reinforced, and the point is that the upper edge is reinforced according to the structure of the present invention compared to the conventional structure. It is fine as long as it has been done.

The embodiments described above do not limit the invention, and the technical scope of the invention is determined by the claims.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the web which is the material of the bag of the present invention, Fig. 2a is a plan view showing the upper edge of the bag, Fig. 2b is a side view thereof, and Fig. 3a is a reinforcing piece. FIG. 3b is a side view, and FIG. 4 is a perspective view showing an example of the present invention. 10...Bag, 11a, 11b...Bag body, 12...
...Seam, 13...Bag body, 14...Top edge,
14a, 14b... Overlapping part, 15... Reinforcement piece,
16... Hand opening part, 17... Bottom of bag, 18...
...Filling valve, 100...web.

Claims (1)

[Claims] 1. A bag 10 consisting of an upper edge 14, a seam 12, a bag body 13, and a bottom 17, the upper edge 1
4 is provided with a handle opening 16 or a structure equivalent thereto, the upper edge 14 is continuous with the bag body 13 via the seam 12, and the upper edge 14 is longitudinally parallel to the seam 12. The reinforcing piece 15 is folded back at least once in the direction, and a reinforcing piece 15 is joined to the surface of the folded side at least so as to span the folded upper edge 14 and the bag body 13.
is at least a part of the seam 12 and the handle opening 1
6. A portable bag made of a sheet or film such as a plastic film, a plastic coated sheet, or a plastic laminate sheet, characterized in that the seams are arranged to improve the strength of the seams so as to simultaneously cover the entire area of the bag. 2. The bag according to claim 1, wherein the reinforcing piece 15 is joined to both sides so as to extend across the upper edge 14 and the bag body 13. 3. Joining both sides of the bag at predetermined intervals to a flat cylindrical web 100 to form horizontal seams 12;
Then, the cylindrical web 100 is cut into a predetermined length along the seam 12 in the longitudinal direction to form a semi-finished bag consisting of the upper edge 14, the seam 12, and the bag body 13 in this order. Then, the upper end edge 14 of the semi-finished bag is folded back at least once in the longitudinal direction parallel to the seam 12, and the folded upper end edge 14
A reinforcing piece 15 is bonded to at least the surface of the folded side so as to extend from the folded side to the bag body 13, and at least the folded upper end edge 14 and the reinforcing piece 15 are combined to form a five-layer structure. bottom part 1
A plastic film, a plastic coated sheet, a plastic film, a plastic coated sheet, a plastic film, a plastic coated sheet, a plastic film, a plastic film, a plastic coated sheet, a plastic film, a plastic coated sheet, a plastic film, a plastic film, a plastic coated sheet, a plastic film, a plastic film, a plastic coated sheet, a plastic film, a plastic film, a plastic coated sheet, a plastic film, a plastic film, a plastic coated sheet, a plastic film, a plastic film, a plastic coated sheet, a plastic film, a plastic film, a plastic coated sheet, a plastic film, a plastic film, a plastic coated sheet, and a plastic film. A method for manufacturing a bag that can be carried by hand using a sheet such as a laminate sheet or a film. 4. The method according to claim 3, in which the reinforcing piece 15 is joined to both sides of the bag body 13 so as to extend across the upper edge 14 and the bag body 13.