JPH0245360A - Goreless self-standing bag and its manufacture - Google Patents

Abstract

PURPOSE:To enable a self-standing bag without using gores to be manufactured by a method wherein a film with a cut provided at a specified position in advance is used at a part to be a folded gusset and put into an automatic bag making and filling machine while the gusset is being folded. CONSTITUTION:A film is supplied to an automatic bag making and filling machine to have a gusset 1 formed at the center, and edges outside a zipper claw are vertically fused to form an upper fused portion 11 of a bag. After the bag is filled with contents, edges are horizontally fused and the center is cut at the same time to have a side fused portion 12 to be formed. Since a fused material 5 is laminated on the inner side of the gusset 1 and cut portions 9, 9.. have been drilled on gusset materials 7, 8, a film 5 and the gusset material 7 are fused and the gusset material 8 and a film 6 are fused at the folded gusset 1, and the films 5 and 6 are directly fused at the cut portion 9 so that self standing bags can be continuously manufactured.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention eliminates the trouble of fusing a gusset to the bottom, and allows bag making and filling to be carried out by an automatic bag making and filling machine using a single continuous film. This invention relates to a self-supporting bag without a gusset that can be manufactured at the same time, and a method for manufacturing the same.

[Conventional technology]

Self-supporting bags, generally called standpunk bags, have a wide bottom and are self-supporting, making it difficult for the contents to spill out, making them suitable for storing contents that are difficult to handle when spilled, such as powder or fluid. Furthermore, the self-standing bag with a zipper not only does not spill even after opening, but also the opening can be resealed, so there is no need to transfer the contents to a separate serving container, making it an extremely easy-to-handle sealed bag.

Conventionally, such self-standing bags have been manufactured by providing a wide bottom and a downwardly protruding fused portion by fusing a gusset to the bottom of the bag separately from the bag body.

[Technical problem to be solved by the invention]

According to the above method, the complicated process of welding the material cut separately from the main body to the bottom is involved, so the contents are filled with the rolled continuous film while performing vertical and horizontal welding. It is not possible to use automatic bag-forming and filling machines. Therefore, not only is the packaging process complicated, but the packaging speed is extremely slow, packaging costs are high, and the range of use thereof is limited. Therefore, there was a need for a self-supporting bag that is made of a single material without fusing the gusset and that can be made and filled at the same time using an automatic bag making and filling machine.

[Means of problem solving]

The present invention aims to solve the above-mentioned problems, and has a structure in which the bottom is a two-sided folding fold formed by one outer fold line and two inner fold lines on both sides of the outer fold line, and the other three folds. A plastic fused bag having two side fused portions and one upper fused portion fused to each other, the folded folds comprising:
A part of the part forming the side fusion part is notched, and the notches of the folding folds on the two sides are in contact with each other, and the notch is narrower than the width of the side fusion part, In addition, the central part in the length direction of the plastic film is folded to form two folds consisting of one outer fold line and two inner fold lines on both sides of the outer fold line, and both end edges are folded. This is a continuous manufacturing method of the fused part by repeating the operations of vertically welding the upper fused part and horizontal welding and cutting to form the side fused part. It is characterized by using a film in which a notch is provided at the part that will become the attachment part, the notch does not span the entire width of the side fused part, and the notches of the folding folds on the two sides coincide with each other.

The material for the self-supporting bag of the present invention is not particularly limited as long as it is plastic. A slightly thicker film that is relatively easy to obtain and has firmness is preferable. Examples include polyester, nylon, polypropylene, laminates thereof, and laminates of these and other materials.In order to improve the gas barrier properties, laminates with polyvinylidene chloride, aluminum foil, etc. are used.

In automatic bag-filling machines, the wound film is unwound,
It is manufactured by vertically welding it while folding it in half, repeating the horizontal welding/cutting process and the filling process.

In the present invention, instead of simply folding the film in half, the film is folded into two sides by providing one outer fold line in the center and two inner fold lines at equal intervals on both ends. Form facing folds. The film thus supplied while forming folds is subjected to vertical welding and horizontal welding and cutting in the same manner as in a normal automatic bag making and filling machine to automatically form and fill bags. In product-sealed bags, the pleats form the bottom of the bag.

Plastic films supplied to automatic bag-forming and filling machines are laminated or coated with adhesive materials such as low-density polyethylene or ethylene-vinyl acetate copolymer on only one surface, which becomes the inner surface when the film is folded. It is something that

When applied on both sides, especially on the outside, when it comes into contact with a heated area, the film and machine or the films will adhere to each other.
This method is difficult to use legally because it is difficult to handle.

Therefore, when a normal film is used, even if pleats are provided, at the lower end of the side fused portion of the manufactured bag, the fused portion separates into two from where the pleats begin. That is, at this location, it is not possible to fuse together four films, including the two films forming the packaging body and the two folded films of the folded material.

In the present invention, the part of the film that becomes the folded folds is horizontally fused (the part that becomes the side fused part in the case of a bag).
A notch is pre-drilled in the hole. Furthermore, the notches must be provided on each of the folding folds on the two sides, and their positions must match each other. Normally, the surface of the film that is not coated with the fusing material would not be fused and protrude in an angular shape, but by cutting out the folded pleat material, the two films other than the folded material will be directly fused together. As a result, four films are fused together, making the bottom firm and self-supporting.

The notch must be narrower than the width of the side fused portion.

If the notch is wider than the width of the side fused portion, the bag opening will not be completely sealed. Further, since the two films other than the folded materials are directly fused together, the notches are located at positions where the folded folds on the two sides are in contact with each other. That is, the notches of the two folded folds are located at the same position. Preferably, the notch is provided at the center of the side fused portion. Since the central part is the part where the continuous bag is cut to make it independent, the notch is also cut and used as a semicircular joint. Moreover, two or more notches may be provided independently through the cutting line.

Although the bag of the present invention may be implemented as a regular bag, it is more advantageous to implement it as a three-side seal type bag with a zipper. Films with zipper claws fused in advance are rolled diagonally, called traverse winding, so that the thick part of the film being wound does not overlap the thick part of the film being wound directly below. The winding can be performed by reversing the direction of deviation when it reaches the position. A rolled film can be handled by an automatic bag-filling machine.

[Effect]

In the present invention, folding folds are provided on one edge of a wound film, the folded film is folded, and the film is subjected to an automatic bag-forming-filling machine in that state. Therefore, according to the present invention, it is possible to eliminate the trouble of separately fusing the gusset material and provide the bag with a wide bottom. To do this, it is necessary to fuse the four films together at the folding folds, but since the surface of the film is generally not coated with adhesive material, the four films are individually fused two by two. cannot be made into one.

Therefore, by providing a notch that corresponds to the gusset portion on the two sides in the fused portion of each two separate sheets, the two films on the surfaces excluding the gusset can be directly fused only in this portion. As a result, a self-supporting bag can be manufactured by integrating and fusing four films without using a gusset.

〔Example〕

FIG. 1 is a perspective view of the self-supporting bag of the present invention before opening, FIG. 2 is an explanatory view showing the manufacturing process, and FIG. 3 is an enlarged view of the portion indicated by the dashed line in FIG. 2.

1 is a V-shaped fold folded into the film 5.6 of the packaging body by an outer fold line 2 and an inner fold line 3.4, and consists of two sides of fold material 7.8. A notch 9 is provided in the center of the portion of the pleated material 7.8 to be horizontally fused. Zipper claws 10 are provided at both ends of the film. The film is fed into an automatic bag-forming and filling machine, a fold 1 is formed in the center, a zipper claw 10 is engaged, the outer edge of the zipper claw is vertically fused, and the upper fused portion of the bag is formed. 11. After filling a certain amount of contents from the hopper, the bag was horizontally fused, and at the same time, the central portion of the horizontally fused portion was cut to form a side fused portion 12, and a filled and sealed bag was continuously produced. 13 is a cutting line at the center of the horizontally fused portion.

The folds 1 are made by laminating a fusing material 15 on the inner surface of a film material 14, as shown in FIG. Furthermore, the pleated material 7.8 is provided with cutouts 9.9'' at corresponding positions. When the films are heated to be welded together laterally, the films 5 and 6 are fused together due to the fusion material 15. At the folding fold 1, the film 5 and the pleat material 7 are fused, and the pleat material 8 and the film 6 are fused, respectively, but at the notch 9, the fold material is missing, so the films 5 and 6 are fused directly. fuse.

Since the size of the notch does not exceed the width of the side fused portion, the area around the notch 9 is also completely sealed. As a result, the four films were fused together, and a self-supporting bag having the shape shown in FIG. 1 was continuously manufactured. In Figure 1,
Reference numeral 16 indicates a portion where four films are fused together in the side fusion portion, and reference numeral 17 indicates a portion where two films overlap in a standing state. 18 indicated by a broken line is a part of the zipper,
Male and female zipper claws are engaged on this back surface.

In this example, a low density polyethylene film was laminated as the fusion material. Moreover, the notch is not limited to one place, but may be provided at two or more places in total on both sides of the folding fold.

〔effect〕

According to the present invention, without using a gusset material, by using a film with cutouts in advance at predetermined positions in the part that will become the folding folds, and applying the film to an automatic bag-forming-filling machine while folding the folds, self-standing is achieved. Certain fused parts can be manufactured efficiently.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a perspective view of a self-supporting bag before opening, Fig. 2 is an explanatory diagram showing the manufacturing process, and Fig. 3 is an enlarged view of the portion indicated by the dashed line in Fig. 2. It is a diagram. In the drawings, 1 is a fold, 2 is an outer fold line, 3.4 is an inner fold line, 5.6 is a film, 7.8 is a pleat material, 9 is a notch, 10 is a zipper claw, 1
1 is the upper fused part, 12 is the side fused part, 13 is the cutting line, 1
4 is a film material, 5 is a fusion material, 16 is a part where the four parts are attached, and 18 is a part of a zipper. Patent applicant Asahi Kasei Polyflex Co., Ltd. Agent Patent attorney Sadako Suzuki

Claims (2)

[Claims] (1) The bottom is a two-sided fold formed by one outer fold line and two inner fold lines on both sides of the outer fold line, and the other three sides are fused to form two side fused parts. and a plastic fusion bag forming an upper fusion part on one side, the part of the folding fold forming the side fusion part is cut out, and the folding folds on two sides are cut out. A self-standing bag without a gusset, characterized in that the notches of the pleats are in positions where they touch each other, and the notches are narrower than the width of the side fused parts. (2) Both ends of the plastic film are folded so as to form two folds consisting of one outer fold line and two inner fold lines on both sides of the outer fold line. This is a continuous method for producing a fused bag by repeating the operation of vertically welding the parts to form the upper fused part, and horizontally welding and cutting to form the side fused part, and the method includes forming a plastic film on the side part of the folded folds. A gusset characterized by using a film in which a notch is provided at the part that becomes the fused part, the notch does not span the entire width of the side fused part, and the notches of the folding folds on the two sides coincide with each other. How to make a self-supporting bag.