JPS6149106B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming resin ribs on a laminated sheet body for molding a cylindrical container, in which resin ribs are formed on the peripheral edge. The purpose is to ensure that when heat-sealing is applied to a container, the mechanical strength of the joint resulting from the heat-sealing is high and the liquid-tightness is complete, and the resin ribs are shaped around the peripheral edge of the laminated sheet body. The purpose of this invention is to reliably, continuously and evenly shape the shape, and the present invention will be described below with reference to the drawings.

1 in the figure is a laminated sheet body on which the method of the present invention is carried out, and this laminated sheet body 1 is a laminate of a paper sheet 1a made of hard paper and an aluminum foil 1b, and has water resistance, acid resistance, and chemical resistance on both sides. It has a structure (see Fig. 2) covered with resin films 1c and 1d made of a thermoplastic synthetic resin material having desired physical properties such as oil resistance and high barrier properties against various gases. It is cut and molded into a rectangular shape (set according to the dimensions of the cylindrical container to be molded).

The peripheral edges, that is, both side edges and upper and lower edges of the laminated sheet body 1 cut into strips,
A resin rib 2 (see FIGS. 1 and 2) made of thermoplastic synthetic resin is integrally welded to the resin films 1c and 1d so as to cover the end face.

The shape of the resin ribs 2 on the end faces of the laminated sheet body 1 can be determined in any way within the range of thickness that does not cause any inconvenience when forming a cylindrical container, as long as the end faces are covered and integrally welded to the resin films 1c and 1d. However, when the laminated sheet 1 is formed into a cylindrical shape, the resin ribs 2 formed on both side edges that become the joint parts are formed of a resin film, as shown in FIG. 2a. 1c, 1d
It is preferable that the thickness be about 5 times that of the laminate sheet body 1 and be located to some extent on the surface of the laminated sheet body 1.

This is because the thickness of the resin films 1c and 1d is extremely thin when the edges on both sides are overlapped and joined, so it is difficult to achieve mechanical strength by simply welding the resin films 1c and 1d together. Therefore, if the resin ribs 2 formed on both side edges are positioned up to the surface of the laminated sheet body 1 to a certain extent as shown in FIG. When the edges are overlapped and bonded, a resin film 1 is formed in which the resin rib 2 portion, which is located on the surface of this laminated sheet body 1 and has a sufficient thickness for bonding, is located on the other side edge.
Since it is integrally welded with c or 1d, a strong and liquid-tight joint between both side edges can be obtained.

Furthermore, when the laminated sheet body 1 is formed into a cylindrical shape, a cap formed into a desired shape made of a thin aluminum plate coated with a resin film of the same quality as the resin films 1c and 1d on one surface is fitted and welded together. The form of the resin ribs 2 formed on both the upper and lower edges, which are the edges of the upper and lower openings to be attached, is the form of the resin ribs 2 formed on both side edges of the laminated sheet body 1 described above. Although the shape may be the same as that shown in the figure, both upper and lower ends of the cylinder formed from the laminated sheet body 1 may be formed into the peripheral edge of the cap and fit into the peripheral groove of the cap. It is meaningless for some of the resin ribs 2 to be located on the surface of the laminated sheet body 1 due to assembly with the cylindrical container, and it is desirable to reduce the amount of synthetic resin material used for the entire cylindrical container. Due to problems in shaping the resin rib 2, which will be described later,
As shown in FIG. 2b, it is preferable to shape the laminated sheet body 1 so that it is located only on the end face thereof.

The present invention relates to a method of shaping resin ribs 2 to the peripheral edge of this laminated sheet body 1 (hereinafter referred to as 3).
(See Figures and Figure 4) The molten resin 6 is attached in a band shape to the circumferential surface of the heating roller 4, which is heated and maintained at a predetermined temperature to prevent the molten resin 6 from cooling and hardening. The end surface of the laminated sheet body 1 is brought into contact with the attached molten resin 6, and the molten resin is transferred from the circumferential surface of the heating roller 4 to the end surface of the laminated sheet body 1, thereby shaping the resin rib 2.

That is, a heated roller 4 whose circumferential surface is treated to prevent the molten resin 6 from adhering to it and which is heated and controlled to a temperature that prevents the molten resin 6 adhering to the circumferential surface from cooling and solidifying is rotated in a predetermined direction at a constant speed. The molten resin 6 flowing down through the downflow gutter 5 onto the surface-treated circumferential surface of the heating roller 4 is formed into a belt shape with a width wider than the thickness of the end surface of the laminated sheet body 1 according to the rotational movement of the heating roller 4. At the same time, the laminated sheet body 1 is moved linearly with respect to the heating roller 4 along a plane perpendicular to the rotation axis 4' of the heating roller 4 with the end face facing the circumferential surface of the heating roller 4. The end face of the laminated sheet body 1 facing the circumferential surface of the heating roller 4 lightly contacts the circumferential surface of the heating roller 4 to which the molten resin 6 is attached, or the thickness of the molten resin 6 attached to the circumferential surface of the heating roller 4 in a band shape The end surface of the laminated sheet body 1 is moved in the same direction as the opposing peripheral surface portion of the end surface at a speed equal to the peripheral surface speed of the heating roller 4, with a gap sufficiently smaller than that of the heating roller 4. enters into the molten resin 6 adhering to the circumferential surface of the heating roller 4.
The molten resin 6 is transferred from the peripheral surface to the end surface of the laminated sheet body 1, thereby shaping the resin rib 2.

In addition, numeral 7 in FIG. 3 is a scraping plate for scraping off the molten resin 6 adhering to the circumferential surface of the heating roller 4 that has not been transferred to the end surface of the laminated sheet body 1 from the circumferential surface of the heating roller 4.

In the case of the method of the present invention, the amount of the molten resin 6 transferred from the circumferential surface of the heating roller 4 to the end surface of the laminated sheet body 1 is determined by the value of the adhesive force of the molten resin 6 to the laminated sheet body 1 and the band-like distribution on the circumferential surface of the heating roller 4. This is determined by the thickness of the molten resin 6 deposited and the gap value between the end face of the laminated sheet body 1 and the circumferential surface of the heating roller 4, so that the resin shaped to the end face of the laminated sheet body 1 by the method of the present invention is Since the thickness of the rib 2 can be made sufficiently small, the resin rib 2 can have a cross-sectional shape as shown in Fig. 2b.
It is advantageous for the modification of .

Of course, by this method of the present invention, resin ribs 2 having a cross-sectional shape as shown in FIG.
It is possible to shape the end face, but in this case, the thickness of the molten resin 6 adhering to the circumferential surface of the heating roller 4 should be made sufficiently large, and the molten resin 6 should be shaped until the molten resin 6 is transferred to the end face of the laminated sheet body 1. It needs to be able to maintain its thickness.

3 and 4 showing the method of the present invention, an example is shown in which resin ribs 2 are formed on one end surface of the laminated sheet body 1, but the heating roller 4 is attached to the laminated sheet body 1. It is possible to provide two resin ribs 2 on both sides of the resin ribs 2 and shape the resin ribs 2 on the two opposing end surfaces at the same time.

By the way, as mentioned above, the resin ribs 2 having the cross-sectional shape shown in FIG. In addition, since the portion located on the surface of the laminated sheet body 1 effectively acts on the bonding, that is, heat welding, between the both side edges of the laminated sheet body 1, the side edges of the laminated sheet body 1 are provided with the parts shown in FIG. 2a. Although it is advantageous to shape the resin ribs 2 having a cross-sectional shape such as If the space between the cylindrical body and the cap is further limited by welding to both the cylindrical body and the cap, the gap formed between the cylindrical body end face and the cap can be filled. There is no need for the section to be located at all, and a cross-sectional shape as shown in FIG. 2b is sufficient.

Note that resin ribs 2 are formed on the entire circumferential edge of the laminated sheet body 1 by a second method by moving the laminated sheet body 1 cut and formed into strips of predetermined dimensions by a combination of linear movement and rotational movement. Needless to say, it may be modified.

As is clear from the above description, the present invention addresses the problem of insufficient bonding force and liquid tightness at the joints of cylinders when manufacturing a cylindrical container using the laminated sheet body 1 coated with resin films 1c and 1d on both sides. The resin ribs 2 are laminated in a desired shape and continuously, easily and more reliably, and have the effect of completely eliminating imperfections in the assembly, insufficient assembly strength between the cylindrical body and the cap, and imperfections in liquid tightness. It exhibits many excellent effects such as being able to be shaped to the edge of the body 1.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a laminated sheet body with resin ribs formed on the peripheral edge, and FIG. 2 is an enlarged cross-sectional view showing different forms of the resin ribs. 3 and 4 are operational state diagrams showing the method of the present invention for shaping resin ribs by transferring molten resin from the circumferential surface of the heating roller to the end surface of the laminated sheet body. Figure 4 is a plan view. Explanation of symbols, 1... Laminated sheet body, 1a... Paper sheet, 1b... Aluminum foil, 1c... Resin film, 1
d... Resin film, 2... Resin rib, 4... Heat roller, 4'... Rotating shaft, 5... Downflow gutter, 6... Molten resin, 7... Scraping plate.

Claims (1)

[Claims] 1 Paper sheet 1a using hard paper and aluminum foil 1b
The laminated sheet body 1 is formed by coating both sides of the laminated body with thermoplastic synthetic resin films 1c and 1d having desired physical properties, and is cut and formed into strips of predetermined dimensions. This is a shaping method of shaping resin ribs 2 made of thermoplastic synthetic resin that are integrally welded with both the resin films 1c and 1d in a form that covers the end faces of the resin films 1c and 1d, and the ribs 2 are rotated at a constant speed in a predetermined direction to laminate the peripheral surfaces. The end face of the laminated sheet body 1 is placed against a heating roller 4 whose surface is treated so that the molten resin 6, which is a thermoplastic synthetic resin that is integrally welded with both resin films 1c and 1d of the sheet body 1, is kept at a predetermined temperature at all times. The heating roller 4 is in a positional relationship such that it lightly contacts the circumferential surface of the heating roller 4 or faces the heating roller 4 with an extremely narrow gap.
The heating roller 4 is moved linearly at a speed equal to the circumferential speed of the heating roller 4 along a plane perpendicular to the rotation axis 4', and the rotational movement of the heating roller 4 is applied to a portion of the peripheral surface of the heating roller 4 facing the end surface of the laminated sheet body 1. According to the flow gutter 5
The molten resin 6 flowing down is applied in a band shape with a width larger than the thickness of the laminated sheet body 1 and a desired thickness, and the molten resin 6 applied in the band shape is applied to the circumferential surface of the heating roller 4. A method for forming resin ribs on a laminated sheet body attached to an end face of a laminated sheet body 1 facing the circumferential surface of the laminated sheet body 1.