JPS6320701B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a self-supporting bag for use by enclosing and sealing liquid, paste, powder, or other products that require sealing.

[Conventional technology]

The bag body is generally made of soft synthetic resin film, paper,
It is manufactured by cutting sheets of nonwoven fabric, metal foil, or laminates of these materials into various shapes so as to make them self-supporting, assembling them, folding the bottom appropriately, and gluing the folded parts. .

[Problem that the invention seeks to solve]

However, the free-standing containers made by these conventional manufacturing methods have complicated folding lines and require the use of complicated machinery for assembly.
In addition, since the shape of the sheet to be cut is complicated, there is a lot of cutting loss, and the appearance is poor due to creases and exposed folded parts after assembly.Furthermore, the self-standing is unstable, making it difficult to fill with contents. However, there were drawbacks such as the inability to use simple filling machines such as those used for conventional bottles and cans.

The purpose of the present invention is to provide excellent sealing performance and self-sustaining stability;
Moreover, it is an object of the present invention to provide a method for manufacturing a self-supporting bag that can easily and efficiently manufacture a self-supporting bag that is excellent in design.

[Means for solving problems]

The method for manufacturing a self-supporting bag of the present invention includes forming a soft flat bag having an opening at the top and a closed bottom end, and inserting the inside of the bag from the top opening to the bottom end of the bag. A process of inserting a rod having a cross-sectional circumference slightly smaller than the circumference, a process of bending inward the ears formed at the lower outer edge of the bag by this process, and a lower part of the bag into which the rod is inserted. into a rigid cylinder whose inner peripheral surface has a cross-sectional shape similar to the cross-sectional shape of the rod, fixing the lower part of the bag to the cylinder, and removing the rod from the bag. and a drawing step.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a self-supporting bag according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 6 show the steps of the method for manufacturing a self-supporting bag according to the present invention.

As shown in FIG. 1, an envelope-like soft flat bag 1 has an opening 2 at the top and a closed bottom end.
Then, a rod 3 having an outer peripheral surface having a cross section slightly smaller than the cross section of the inner peripheral surface of the bag is inserted into the bag 1.
In this case, the bag or the rod may be appropriately heated in advance to facilitate insertion of the rod.

Reference numeral 4 denotes an air vent groove provided along the longitudinal direction of the rod body 3. The purpose of this air vent groove 4 is to release the air inside the bag 1 to the outside as the rod 3 is inserted into the bag 1. Therefore, air vent groove 4
Instead of providing the rod, the rod may be made hollow and air vent holes may be provided at the top and bottom.

As shown in FIG. 2, when the rod 3 reaches the vicinity of the lower end of the bag 1, extra lugs 5 are formed at both corners of the lower end of the bag 1, and the extra lugs 5 are folded inward.

Note that depending on the cross-sectional shape of the rod, the extra selvage may extend to the entire circumference of the bottom of the bag, so when folding the extra selvage, the upper wall should be the same as the bag 1 into which the rod 3 is inserted.
It is preferable to use a funnel-shaped receiving mold that is circumscribed by and has a tapered lower wall.

Next, as shown in FIG. 3, the bag 1 with the rod 3 still inserted has a cross-sectional shape similar to the cross-sectional shape of the rod 3, and an inner peripheral surface that is in contact with the lower outer peripheral surface of the bag. A rigid bottomed cylindrical body 6 formed to have
Interpolate into.

Reference numeral 7 indicates an air vent hole provided at the bottom of the cylindrical body, but instead of such an air vent hole, a slit may be provided in the peripheral wall portion of the cylindrical body 6.

Heat-sensitive glue is applied to the inner peripheral surface of the cylindrical body 6 in advance.

Next, as shown in FIG. 4, the area around the cylinder is heated to a temperature that causes the adhesive effect of the heat-sensitive glue, and after the joint surfaces of the bag body 1 and the cylinder body 6 are adhesively fixed, the rod is pulled upward. By this method, a self-supporting bag as shown in FIG. 5 can be obtained.

Note that instead of applying heat-sensitive glue to the inner surface of the bottomed cylindrical body 6, the joint surfaces of one or both of the bag 1 and the cylindrical body 6 are made of a material that can be heat-fused. can also be fixed.

The self-supporting bag obtained in this way has excellent self-supporting stability because its lower part is inserted into a rigid bottomed cylinder, and therefore it is easy to fill with contents such as liquids and powders. It is.

After filling with the contents, the upper opening can be appropriately sealed by a known method to form a sealed storage container.

The soft flat bag used in the present invention is made of polyethylene,
Materials that are flexible and have excellent tensile strength, such as nylon, synthetic resin films such as vinylidene chloride, paper, nonwoven fabric, metal foil, or laminates thereof, which are conventionally used for this type of soft flat bag, are used. The bottomed cylindrical body constituting the lower part of the bag is made of synthetic resins such as hard vinyl chloride and hard polyethylene, as well as highly rigid or relatively rigid materials such as cardboard and metal.

It goes without saying that when manufacturing the self-supporting bag of the present invention, the cross-sectional shapes of the rod and the bottomed cylinder can take various shapes, such as circular, circular, polygonal, etc.

〔effect〕

The method for manufacturing a self-supporting bag of the present invention as described above does not require complicated folding lines, so it does not require the use of complicated machinery or cutting loss, and can be easily and efficiently carried out. A self-supporting bag can be manufactured. In addition, the manufactured self-supporting bag is easy to mold, has excellent sealing performance, and self-supporting stability, and the folded portion and creases caused by folding are hidden within the bottomed cylinder that constitutes the lower part of the bag. Therefore, it is aesthetically pleasing, and when the bag is opened, the opening follows the shape of the cylindrical body at the bottom, so it has excellent features such as being able to be used as a pot-shaped container.

[Brief explanation of the drawing]

FIGS. 1 to 4 are explanatory diagrams showing a method for manufacturing a self-supporting bag according to an embodiment of the present invention in order of steps, and FIG. 5 is a perspective view showing a self-supporting bag manufactured by the same method. 1... Bag body, 3... Rod body, 6... Bottomed cylinder body, 8... Heater.

Claims (1)

[Claims] 1. A soft flat bag having an opening at the top and a closed bottom end, the length from the top opening of the bag to the bottom end of the bag being slightly smaller than the inner circumference of the bag. a step of inserting a rod having a cross-sectional circumference of A step of inserting the rod into a rigid cylinder whose inner peripheral surface has a cross-sectional shape similar to that of the rod, a step of fixing the cylinder and the lower part of the bag, and a step of pulling out the rod from the bag. A method for manufacturing a self-supporting bag. 2. The method for manufacturing a self-supporting bag according to claim 1, wherein the rod is provided with an air vent groove along the longitudinal direction of the rod. 3. The method for manufacturing a self-supporting bag according to claim 1 or 2, wherein an air vent hole is provided at the bottom of the cylinder. 4. A method for manufacturing a self-supporting bag according to claim 1, 2, or 3, in which heat-sensitive glue is applied in advance to either or both of the joining surfaces of the cylinder and the soft bag. .