JPS6356853B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple container made of synthetic resin and a method for manufacturing the container.

For example, paper containers are used as containers for storing frozen sweets, but even if they are provided with moisture-proofing means, paper containers have the disadvantage of being easily damaged. Injection molded plastic containers are used to eliminate these defects, but
Injection molding is relatively expensive because the molds are expensive.

The present invention relates to a simple container that eliminates such drawbacks and a method for manufacturing the container, which will be described below.

1 is a simple container according to the present invention. The container has a flexible synthetic resin body 2 formed by cutting a circular pipe obtained by extrusion molding into a predetermined size, and the lower end of the body is pressed from both left and right sides with a plate. A seal portion 3 is formed by welding in a shape. Further, an outward flange 4 is formed at the upper end of the barrel by bending or folding back the tip of the barrel outward. The opening surface of the upper end of the outward flange may be closed by welding an aluminum sheet 5 having a synthetic resin film layer on the lower surface.

The simple container 1 having the above structure is manufactured as shown in FIG. 2 and subsequent figures.

First, a flexible circular pipe made of synthetic resin is made by extrusion molding, and this is cut into a predetermined size to form a barrel 6. Next, as shown in FIG. 2A, the cylinder is fitted onto a mandrel 7 having an outer diameter that is approximately the same as the inner diameter of the cylinder, using a suitable pushing tool 8 or the like. It is desirable to heat the mandrel to a temperature suitable for plastic deformation. The heating method includes blowing hot air from outside, or providing a through hole in the mandrel and blowing hot air, steam,
Possible methods include passing hot water or the like, heating with a heater, etc. Next, as shown in FIG.
A short cylindrical jig 10 having a tapered guide cylinder part 9 with a thinner tip and a larger rear outer diameter at the peripheral edge of the tip side cylinder hole is fitted to the lower end of the mandrel. Insert the tip of the guide tube between the outer surface of the mandrel and the inner surface of the end of the body forming tube, and push it in as it is to expand the end of the body forming tube under the guidance of the guide tube and push it outward. The outward flange 4 is formed by bending or folding back. As shown in the figure, in order to prevent the trunk forming cylinder 6 from being pushed in by the short cylindrical jig, the pressure contact 11 is
... may be provided to press the trunk forming tube into contact with the mandrel. Figures A, B, C, and D each show the shape of the outward flange, and the shape of the outward flange varies depending on the shape of the guide cylinder and the degree of pushing into the end of the body forming cylinder. It can be changed.

After forming the outward flange 4, the barrel forming cylinder 6 is removed from the mandrel, and the ends of the cylinder on the side that does not have the outward flange are pressed from both left and right sides and welded into a plate shape to form the seal part 3.

The present invention has the above-mentioned structure, in which a circular pipe obtained by extrusion molding is cut into a predetermined size to form a cylinder for forming the body, and its lower end is pressed from both left and right sides and welded into a plate shape to seal it. 3, and the upper end of the cylinder is bent or folded back to form an outward flange 4 on the body, so no mold is required compared to when forming by injection molding or the like. Since it is easy to mass-produce, the cost can be kept low, and the container is formed of a flexible pipe, but since the above-mentioned outward flange and seal portion are formed, it is made to have enough rigidity to be used without any problems. I can do it. In addition, in the manufacturing method, the circular pipe is fitted onto a mandrel at a temperature suitable for plastic deformation, and a tapered guide cylinder portion 9 with a thin tip and a large outer diameter at the rear is attached to the tip side tube. By fitting the short cylindrical jig 10 protruding from the periphery of the hole into the mandrel, and inserting the tip of the guide cylinder part 9 between the outer surface of the mandrel and the inner surface of the end of the trunk forming cylinder, the jig 10 is pushed in as it is. The end of the barrel forming tube is expanded and bent outward or folded back under the guidance of the guide tube to form an outward flange, so forming the outward flange is extremely easy and inexpensive. containers can be manufactured.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of a simple container according to the present invention, Fig. 2 shows a method for manufacturing the simple container, and Fig. A shows a state in which a body forming tube is fitted to a mandrel. , Figure B is a state in which a short cylindrical jig is fitted to a mandrel with a barrel-forming cylinder fitted to the mandrel, and Figures C, D, and E are in which the short cylindrical jig is pushed in to form an outward flange. 3A, B, C, and D are cross-sectional views showing the shape of the outward flanges, respectively. DESCRIPTION OF SYMBOLS 1...Simple container, 2...Body part, 3...Sealing part, 4...Outward flange, 6...Body forming cylinder, 7...Mandrel, 8...Pushing tool.

Claims (1)

[Scope of Claims] 1. It has a flexible synthetic resin body formed by cutting a circular pipe obtained by extrusion molding into a predetermined size, and the lower end of the body has a A seal part is pressure-welded and welded into a plate shape,
A simple container made of synthetic resin has an outward flange integrally attached to the upper end of the body by bending or folding back the upper end of the body. 2 Cut a flexible synthetic resin circular pipe formed by extrusion molding into a predetermined size to make a barrel-forming tube, and fit the barrel-forming tube into a mandrel with an outer diameter that is approximately the same as the inner diameter of the tube. Then, the tube is placed at a temperature suitable for plastic deformation, and a short cylindrical jig having a cylindrical hole with an inner diameter that is approximately the same as the outer diameter of the mandrel is fitted onto the mandrel, and the cylindrical hole on the distal end side of the jig is fitted onto the mandrel. By inserting a tapered guide tube formed on the peripheral edge with a thin tip and a large rear outer diameter between the outer surface of the mandrel and the inner surface of the end of the body forming tube, the guide tube is formed. The ends of the barrel forming tube are expanded and bent outward or folded back to form an outward flange by the guidance of the section, and the barrel forming tube is removed from the mandrel to form an outward flange. A method for manufacturing a simple container made of synthetic resin, characterized in that the end portion of the cylinder on the side without the cylindrical portion is pressed from both left and right sides and welded into a plate shape for sealing.