JPS6213963Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a container for filling and sealing dairy products, Japanese sake, etc.

This type of container is known to consist of a box-shaped container body having a rectangular opening and a thermoplastic resin cap heat-sealed to the opening. Such containers are widely used because they are simple and inexpensive to manufacture, but a drawback is that the filling is susceptible to leakage from the sealing surfaces, particularly at the corners.

The purpose of this invention is to eliminate the above-mentioned drawbacks and provide a sealed container in which there is no leakage of the filling from the sealing surface.

In order to achieve the above object, this invention consists of a container body having a corner at the opening, a lid fitted and fused to the inner surface of the opening edge of the container body, and a lid designed to fill the gap created at the corner. and a thermoplastic resin sealing member having a protrusion fitted into the gap.

Since this invention is based on the above configuration,
The gap created at the corner of the sealing surface of the container body and lid is filled by fitting the protrusion of the sealing member into the gap, and when the lid is heat-sealed, the protrusion melts and the corner is bonded. Therefore, it is possible to prevent the filling from leaking from the same part.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

As shown in FIG. 1, the sealed container according to this invention consists of a container body 1, a lid 2, and a sealing member 3.

The container body 1 is formed from a paper-based sheet material into a box shape with an open top, and has a peripheral wall 11 and a bottom wall 12 with a square horizontal cross section.
The peripheral wall 11 is formed by being bent. Further, the bottom wall 12 is folded in and closed, although not shown. Each wall 1 of this container body 1
1 and 12 are made of the above-mentioned sheet material (not shown), but their inner surfaces are formed of layers of polyethylene, aluminum foil, paper, and polyethylene in the order shown.

The lid 2 is formed by press-molding a multilayer sheet material into a substantially upwardly concave shape, and has a peripheral wall 21 and a bottom wall 22. At the upper end of the peripheral wall 21, a collar 2 is provided facing outward.
3 is formed. Further, the multilayer sheet material is made of aluminum foil as a base material, and both surfaces thereof are coated with a thermoplastic resin having anticorrosion properties such as polyethylene or polyester.

Furthermore, a thermoplastic resin plate-like member 24, which is approximately rectangular when viewed from above, is heat-sealed to the corner of the bottom wall 22 of the lid 2. A thin cutting portion 24b is formed in this plate member 24 so as to surround a portion that is opened and becomes a spout (hereinafter referred to as a portion corresponding to the spout, indicated by 24a). A tongue-shaped tension ring 2 is integrated with the portion 24a.
4c is formed. The thin wall portion 24b is an annular groove having a V-shaped cross section and having a thin wall at the bottom of the groove.

The container main body 1 and the lid 2 having the above configuration are fitted together as follows. That is, the lid 2 is attached to the inner surface 11a of the opening edge of the peripheral wall 11 of the container body 1.
The peripheral walls 21 are fitted with their outer peripheral surfaces 21a in contact with each other. Therefore, the container body peripheral wall inner surface 11a and the lid peripheral wall outer peripheral surface 21a serve as sealing surfaces. By the way, since the container body 1 is formed by bending, the corners of the peripheral wall 11 can be formed into relatively acute angles. On the other hand, lid 2
is formed by press molding, so the peripheral wall 21
It is difficult to form sharp corners, and the corners become rounded. Therefore, when the container body 1 and the lid 2 are fitted together as described above, gaps S are created at the four corners between the peripheral walls 11 and 12, as shown in FIG.

The sealing member 3 is made of thermoplastic resin such as polyethylene and is injection molded, and is attached to the lid 2.
It consists of an annular part 31 formed along the peripheral wall 21 of a size that allows the annular part 31 to be inserted therethrough, and a protrusion 32 formed in a hanging shape from the inner edge of the corner of this annular part 31. As shown in FIG. 3, the length of this protrusion 32 is approximately equal to the length of the peripheral wall 21 of the lid 2 in the vertical direction. Further, it is desirable that the protrusion 32 has a shape that can almost fill the gap S, but depending on the size of the gap S, the protrusion 32 may be a simple cylinder or an edge piece. This sealing member 3 is integrated with the lid 2 in the following manner. The peripheral wall 21 of the lid 2 is fitted into the annular portion 31 of the sealing member 3, and the annular portion 31 is spot-sealed to the flange 23 of the lid 2. By integrating the sealing member 3 and the lid 2 in advance in this manner, it becomes possible to handle the lid 2 by a normal capping operation when fitting the lid 2 into the container body 1.

Now, when the container body 1 and the lid 2 are fitted together as described above, the protrusion 32 of the sealing member 3 is inserted into the gap S. Then, the container body 1 and the lid 2
When both peripheral walls 11 and 21 are heat-sealed using ultrasonic waves, high frequency waves, etc., at the same time, the protrusion 32 of the sealing member 3 melts and the peripheral walls 1
1 and 21 are glued together.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is an exploded perspective view, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 shows the main parts of this invention. , is a partially enlarged sectional view taken along the - line in FIG. 2. DESCRIPTION OF SYMBOLS 1... Container body, 2... Lid, 3... Seal member, 11a... Inner surface of container body, 32... Projection, S
……gap.

Claims (1)

[Scope of utility model registration request] A container body 1 having a corner at the opening, and a lid 2 fitted and fused to the inner surface 11a of the opening edge of the container body 1.
and a thermoplastic resin sealing member 3 having a protrusion 32 fitted into the gap S so as to fill the gap S formed at the corner.