JPS5912460B2 - Method for forming a cylindrical body in a laminated sheet container whose both sides are coated with a synthetic resin film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a cylindrical body in a container generally called a composite container, which is made of a laminated sheet whose both sides are coated with a synthetic resin film, and a method for forming resin ribs on the cylindrical body. This invention relates to a method for easily molding a cylindrical body having resin ribs formed on its end surface, which are extremely effective for liquid-tight and strong assembly of the cylindrical body and the cap.

Hereinafter, the present invention will be explained with reference to the drawings. The laminated sorted body 1 as a molding material for the cylinder body 2 is a laminate of a paper sheet 1a made of hard paper and an aluminum sheet 1b, and has water resistance and acid resistance on both sides. , chemical resistance and oil resistance, which are coated with thermoplastic synthetic resins LC and Id, and cut into strips with predetermined dimensions determined by the size of the cylinder 2 to be molded. ing. In this way, the laminated sheet body 1 is made up of a paper sheet 1a, an aluminum layer 1b, and both resin films Ic,
Since the laminated sheet body 1 has a laminated structure consisting of the resin films Ic and Id, both sides of the laminated sheet body 1 have desired durability such as water resistance and acid resistance due to the resin films Ic and Id. Since the lb is exposed, up to 20 lb is currently a material with many drawbacks as a molding material for containers.

In addition, since the resin films Ic and Id are extremely thin, when the cap is attached to the cylinder 1 formed by rolling the laminated sorted body 1, the resin films lc and Id are melted and welded by heat sealing. It was not possible to weld and assemble the body 2 and the cap 25 in a strong and liquid-tight manner. Therefore, when welding the cap to the cylindrical body 2 by heat sealing, 30 pieces of thermoplastic synthetic resin are interposed between the cap and the cylindrical body 2 to be integrally welded with the resin films Ic and Id. This is an effective means for strongly and liquid-tightly assembling 2 and the cap.

There are various means for interposing this resin body between the cylinder body 2 and the cap, and the present invention is one of these various means, and the laminated sheet body 351 is placed in the paper sort 1a.
After forming the cylindrical body 2 by rolling it so that the aluminum No. 1b is on the inside and overlapping both side edges, pressing the overlapping both side edges along the overlapping direction and heat sealing, A resin rib 3 is formed on the end face of this cylinder 2 to complete the cylinder 2. When the resin ribs 3 are formed on the end faces of the main body of the cylinder 2 after the main body of the cylinder 2 is molded using the laminated sheet body 1 in this way, a laminated layer 7 with the resin ribs 3 formed on both the upper and lower end faces is formed. Compared to the case of the cylinder body 2 having resin ribs 3 on the end face formed by rolling the sheet body 1, the resin ribs 3 are formed when the laminated sheet body 1 is formed into the cylinder body 2 by heat sealing. It has the advantage that there is no risk of deformation due to heat sealing operations. This means that heat sealing between the cylindrical body 2 and the cap can be achieved more uniformly and reliably along the circumferential direction of the cylindrical body 2. The present invention is a laminated sorted body 1
After molding into a cylindrical shape, resin ribs 3 are added to both the upper and lower end surfaces of the cylindrical body 7 to form the cylindrical body 2. Two easier and more reliable shaping methods will be described below.

First, the first method is (see Figures 3 and 4 below)
, Put the molten resin 4 which has been melted into a liquid state to form the resin ribs 3 into a suitable tank, heat and keep it warm so that the molten resin 4 maintains high fluidity, and place it so that the liquid level is a horizontal surface. The cylindrical body 2 held in an upright position is lowered into the horizontal surface of the molten resin 4, so that only the lower edge portion of the cylindrical body 2 is immersed. When the lower edge of the cylinder 2 is immersed in the horizontal part of the molten resin 4, the molten resin 4 is in a heated state, so the heat of the molten resin 4 is applied to the resin film 1c on the lower edge of the cylinder 2. , 1d are also softened and become welded together with the molten resin 4. In this way, when the resin films 1c and 1d are melted together with the molten resin 4, if the cylinder 2 is pulled up, a part of the molten resin 4 will be transferred to the lower edge of the cylinder 2. The resin ribs 3 are attached to the cylindrical body 2 and pulled up together with the cylindrical body 2, and the resin ribs 3 are formed on the lower edge of the cylindrical body 2. By the way, in this method, the time for which the lower end portion of the cylinder 2 is immersed in the molten resin 4 is extremely short, and in reality, as soon as the lower end portion of the cylinder 2 is immersed in the molten resin 4, the cylinder 2 is immersed in the molten resin 4. Body 2 will be pulled up.

This is because the softening of the resin films 1c, 1d by the heat of the molten resin 4 does not necessarily soften the entire resin films 1c, 1d at the lower edge of the cylinder 2, but only the surface portions of the resin films 1c, 1d. That's because you can. This method of shaping the resin ribs 3 has the advantage that it can be easily carried out and the shape of the resin ribs 3 is uniform and reliable, but it has the disadvantage that it tends to be difficult to control the temperature of the molten resin 4. ing. Next, the second
The method (see Figures 5 to 7 below) utilizes a transfer method, in which the peripheral surface is treated to make it difficult for the molten resin 4 to stick to it, and the temperature is kept at a temperature that does not solidify the molten resin 4. A heating roller 5 whose heating is controlled is rotated at a constant speed in a predetermined direction. The molten resin 4 flowing down through the downflow gutter 6 is continuously attached to the circumferential surface of the heating roller 5 in a band shape with a width larger than the end face width of the cylinder 2 and a desired thickness, and the other cylinder 2 to the circumferential surface of the heating roller 5 to which the molten resin 4 is attached, or by lightly contacting the end surface with the circumferential surface, or between the end surface and the circumferential surface, and forming a band on the circumferential surface of the heating roller 5. The cylindrical bodies 2 are arranged facing each other in a positional relationship that forms a gap that is sufficiently smaller than the thickness of the molten resin 4 attached to the heating roller 5, and the end face portion facing the circumferential surface portion of the heating roller 5 is aligned in the same direction as the circumferential surface portion. The cylindrical body 2 is rotated at a constant speed so as to move at the same speed as the heating roller 5, and the cylindrical body 2 is placed inside the belt-shaped molten resin 4 that revolves to face the end surface of the cylindrical body 2 due to the rotation of the heating roller 5.
The end faces of the heating roller 5 are immersed one after another, and a part of the molten resin 4 adhering to the circumferential surface of the heating roller 5 is removed from the cylindrical body 2.
The resin ribs 3 are shaped by integrally welding and rolling the resin films 1c and 1d located at the edge of the cylindrical body 2 so as to cover the end faces. This method requires that the temperature of the molten resin 4 is easily controlled, and that the resin ribs 3 to be shaped are
Although this method has advantages such as being able to freely control the wall thickness to a required value, it has the disadvantage that the configuration of the apparatus for implementing this method is more complex than the first method.

In the second method, the cylindrical body 2 is moved linearly along a plane including the axis of the rotation shaft 5' of the heating roller 5 while keeping the end face facing the circumferential surface of the heating roller 5 without rotating the cylinder 2. On the other hand, the width of the molten resin 4 attached to the circumferential surface of the heating roller 5 may be made larger than the width of the planar shape of the cylindrical body 2;
The molten resin 4 is not necessarily transferred to the cylinder 2 to cover only the end surface of the cylinder 2, but there is a possibility that the molten resin 4 may sometimes be transferred to the cylinder 2 in such a manner as to close the entire opening of the cylinder 2.

As is clear from the above description, in the present invention, the resin ribs 3 are shaped on the end surface of the cylinder 2 after the laminated sheet body 1 is heated and tooled to form the cylinder 2j. The resin ribs 3 that are shaped into the cylinder body 2 are not affected by thermal effects caused by the heating operation for molding the cylinder body 2, and the resin ribs 3, which have a significant effect on the assembly of the cap to the cylinder body 2, are kept in a good shape. Since it is possible to form a cylindrical body 2, it is possible to obtain a cylindrical body 2 which is extremely useful as a cylindrical body for a composite container.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a laminated sorted body for forming a cylindrical body, and the circles in the figure are enlarged cross-sectional views showing the laminated structure of the laminated sheet body. FIG. 2 is an overall perspective view showing the operation of forming a cylindrical body using a laminated sheet body. 3 and 4 are longitudinal cross-sectional views showing the operation mode of the method of forming resin ribs on the cylindrical body. The figure shows the state in which the cylindrical body has been pulled up from the state shown in FIG. Figures 5 to 7 are diagrams showing the operating state of a method using a transfer method, which is a method of forming resin ribs onto other cylinders, with Figure 5 being an overall perspective view and Figure 6 being a front view. , FIG. 7 is a plan view. FIG. 8 is an overall perspective view of a cylindrical body formed by the method of the present invention. Explanation of symbols, 1: Laminated sheet body, 1a: Paper sheet, 1b: Aluminum foil, 1c, 1d: Resin film, 2: Cylindrical body, 3: Resin rib, 4: Soluble acid resin, 5: Heat roller, 6: Flowing gutter.

Claims (1)

[Claims] 1. Thermoplastic synthetic resin films 1c and 1d with predetermined physical properties are coated on both sides of a laminate of a paper sheet 1a made of hard paper and an aluminum foil 1b.
A laminated sheet body 1, which is cut and formed into a rectangular shape of a predetermined size, is rolled up so that the aluminum foil 1b is on the inside of the paper sheet 1a, and the edges on both sides are overlapped. Both side edges of the laminated sheet body 1 are pressed along the stacking direction while being heat-sealed and welded to form a cylinder 2, and then resin films 1c, 1 are formed on both upper and lower end surfaces of the cylinder 2.
A resin rib 3 made of thermoplastic synthetic resin that is integrally welded to b is coated on the end face of the cylindrical body 2, and is formed by integrally welding both resin films 1c and 1d.It is made of a laminated sheet in which both sides are covered with a synthetic resin film. A method for forming a cylinder in a container.