JP2006232340A - Container packing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packing thermally pressure-welded to an internal top face of a lid for use, which is excellent in sealability, stably usable for contents and excellent in thermal pressure weldability to the internal top face of the lid. <P>SOLUTION: The container packing to be thermally pressure-welded to the internal top face of the lid for use has an upper layer to be thermally compressed to the internal top face of the lid made of a polyethylene resin, a lower layer to serve as a sealing face made of polypropylene resin, and a foaming layer made of synthetic resin between them. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a container packing that is used by thermocompression bonding to the inner top surface of a lid.

  Conventionally, a foamed sheet material made of polyethylene (hereinafter referred to as PE) resin has fine cells, has a smooth surface and is flexible, and has been used as a packing for containers. Patent Document 1 describes a foamed sheet made of polypropylene (hereinafter referred to as PP) resin that has heat resistance even when the contents are filled at a high temperature and can be used as a packing that does not deteriorate the sealing performance.

On the other hand, in the field of cosmetic containers such as creams and waxes, aluminum cans (hereinafter referred to as aluminum cans) are used in order to differentiate and upgrade the products in terms of appearance and touch. And the packing which uses the said PE resin foam sheet material is thermocompression-bonded to the inner top surface of a lid | cover, the can is sealed, and the volatilization of the content or the approach of external air is prevented.
JP 2003-118767 A

  However, the packing using the PE resin foam sheet material has a problem that the sealing performance is insufficient depending on the contents. On the other hand, when the PP resin foam sheet material is used, the lid is made of aluminum. There is a problem that thermocompression bonding to the inner top surface becomes difficult.

Accordingly, an object and an object of the present invention is a packing that is used by thermocompression bonding to the inner top surface of the lid, has excellent sealing performance, can be used stably with respect to the contents, and is applied to the inner top surface of the lid. The object is to provide a packing excellent in thermocompression bonding.

  Among the means for solving the above technical problem, the means of the invention described in claim 1 is a packing for a container used for sealing the container by thermocompression bonding to the inner top surface of the lid. The upper layer that is thermocompression-bonded to the surface is made of polyethylene resin, the lower layer that becomes the sealing surface is made of polypropylene resin, and a synthetic resin foam layer is provided in the middle.

  The said structure of Claim 1 formed packing in the laminated form so that the thermocompression bonding function to the inner top surface of a lid | cover, the softness | flexibility as a packing, and a sealing function could each be exhibited separately. is there. That is, by making the upper layer thermocompression bonded to the inner top surface made of PE resin that can be melted at a relatively low temperature, it is possible to easily achieve thermocompression bonding to the inner top surface of the lid. A certain flexibility is exhibited, and the lower layer serving as the sealing surface is made of PP resin, so that it has excellent sealing properties and can be used stably with respect to the contents.

  The means of the invention described in claim 2 resides in that, in the invention described in claim 1, it is used for a container having a metal lid.

  According to the above configuration of claim 2, PE resin can be easily thermocompression bonded to a metal such as aluminum or steel, has excellent sealing properties, can be stably used for contents, and is thermocompression bonded to the inner top surface of the lid. It is possible to provide a packing for a container having a metal lid that is excellent in properties.

  According to a third aspect of the invention, there is provided the invention according to the second aspect, wherein the aluminum can is used.

  It is possible to provide a packing for an aluminum can that is excellent in sealing performance, can be used stably with respect to the contents, and has excellent thermocompression bonding to the inner top surface of the lid.

  According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the foamed layer uses a PE resin foamed sheet, and the upper surface of the foamed layer is coated with a PE resin paint. In other words, a PP resin film is laminated on the lower surface through an adhesive layer to form a lower layer.

  The said structure of Claim 4 is a specific example of the laminated structure of the packing of this invention, The foam sheet made from PE resin, especially low-density PE resin has a fine cell, and the surface is smooth and flexible and is a container. As well as exhibiting a sufficient function as a packing for the use, it can be obtained at low cost.

  Also, by coating the top surface of this foam sheet with PE resin paint, the top layer made of PE resin can be formed by filling the unevenness of the foam layer and facilitating thermocompression to the inner top surface of the aluminum lid. can do. Then, a PP resin lower layer can be easily formed by laminating a PP resin film on the lower surface via an adhesive layer. Note that the PP resin film can be laminated on the foamed layer in a thermocompression-bonding manner by a dry laminating method, or can be laminated by an extrusion laminating method using an activated polyolefin resin as an adhesive layer.

  The means of the invention described in claim 5 is that, in the invention described in claim 1, 2, 3 or 4, the upper layer and the lower layer can be distinguished by coloring.

  According to the above configuration of the fifth aspect, the upper layer and the lower layer can be clearly identified, the packing can be prevented from being set upside down by mistake, and the process can be easily managed.

The present invention has the above-described configuration, and has the following effects.
In the invention according to claim 1, the packing is formed in a laminated form so that the thermocompression bonding function to the inner top surface of the lid, the flexibility as the packing, and the sealing function can be exhibited separately. Therefore, it is possible to provide a packing for a container that is excellent in sealing performance, can be used stably with respect to the contents, and has excellent thermocompression bonding to the inner top surface of the lid.

  In the invention of claim 2, PE resin can be easily thermocompression bonded to metals such as aluminum and steel, has excellent sealing properties, can be used stably with respect to the contents, and to the inner top surface of the lid. It is possible to provide a packing for a container having a metal lid that is excellent in thermocompression bonding.

  In invention of Claim 3, providing the packing for aluminum cans which is excellent in sealing performance, can be used stably with respect to the contents, and is excellent in thermocompression bonding to the inner top surface of the lid. Can do.

  The invention according to claim 4 is a specific example of a laminated structure, in particular, a foam sheet made of low-density PE resin has fine cells, has a smooth surface and is flexible, and functions sufficiently as a packing for containers. By forming the upper layer by coating with PE resin paint, it is possible to fill the unevenness of the foam layer and facilitate thermocompression bonding to the inner top surface of the lid. A lower layer made of PP resin can be easily formed by laminating.

  In the invention according to claim 5, by making the upper layer and the lower layer distinguishable by coloring, the upper layer and the lower layer can be clearly identified, and the packing can be prevented from being set upside down by mistake. And process control can be easily performed.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of the packing of the present invention. The packing 3 is disc-shaped, and the foam layer 5 as an intermediate layer uses a foam sheet material made of low density PE resin.

  The upper layer 4 to be thermocompression bonded to the inner top surface 2a (see also FIG. 2) of the aluminum lid 2 is coated with a low-density PE resin coating so that the surface of the foamed layer 4 is filled and smoothed. Formed. The lower layer 7 is formed by laminating a film made of PP resin by a dry laminating method in a thermocompression-bonded or heat-welded state via the adhesive layer 6.

  FIG. 2 is a partially broken perspective view showing an example of a usage mode of the packing 3 of the present invention. This container is a so-called aluminum can, which is composed of a container body 1 having a bottomed short cylindrical shape and a lid 2 that is screwed to the container body 1, and an upper layer made of low-density PE resin on the inner top surface 2 a of the lid 2. 4 is thermocompression bonded, and the packing 3 is set in the lid 2.

  When the lid 2 is screwed and assembled, the peripheral portion of the lower layer 7 made of PP resin is pressed against the upper end surface 1a of the container body 1 by the screwing force, and the sealing performance of the aluminum can is ensured.

  As in the present invention, the lower layer 7 serving as the sealing surface is made of PP resin, so that the volatilization amount of the contents can be reduced by about 1/10 compared to that made of PE resin.

  In addition, this invention is not limited to the said Example. For example, the laminated structure of the packing is not limited to that of the above-described embodiment, and various forms of laminated structures can be taken in consideration of applications, costs, and the like. For example, a PE resin film can be laminated by a dry laminating method or an extrusion laminating method to form an upper layer.

  The foam layer is not limited to a low density PE resin, and various resin foam layers such as a linear low density PE resin and a PP resin can be used. Also, if a sheet material having a skin core structure made of low-density PE resin is used for the foam layer, the skin portion can be used as an upper layer. Conversely, a sheet material having a skin core structure made of PP resin is used for the foam layer. If used, the skin portion can be used as a lower layer.

  Further, the operational effects of the packing of the present invention are not limited to the aluminum cans described as examples. For example, a lid made of aluminum, steel, or synthetic resin, and aluminum, steel, or synthetic resin The manufactured container body can be used for various types of containers that are combined depending on the application.

  As described above, the packing of the present invention is excellent in hermeticity, can be easily thermocompression bonded to the top surface of the lid, is inexpensive, and can be expected to be used in a wider range of applications as a packing for containers.

It is a longitudinal cross-sectional view which shows one Example of the packing of this invention. It is a partially broken perspective view which shows an example of the usage condition of the packing of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Container main body 1a; Upper end surface 2; Lid 2a; Inner top surface 3; Packing 4; Upper layer 5; Foamed layer 6;

Claims (5)

A container packing used for sealing a container by thermocompression bonding to the inner top surface (2a) of the lid (2), and an upper layer (thermocompression bonding to the inner top surface (2a) of the lid (2) ( A container packing having a configuration in which 4) is made of polyethylene resin, a lower layer (7) serving as a sealing surface is made of polypropylene resin, and a synthetic resin foam layer (5) is provided in the middle. The packing for containers according to claim 1, which is used for a container having a metal lid (2). The packing for containers according to claim 2 used for an aluminum can. Polyethylene resin foam sheet is used for the foam layer (5), and the upper surface of the foam layer (5) is coated with a polyethylene resin paint to form the upper layer (4), and the lower surface is made of polypropylene via the adhesive layer (6). The packing for containers according to claim 1, 2 or 3, wherein a resin film is laminated to form a lower layer (7). The packing for containers according to claim 1, 2, 3 or 4, wherein the upper layer (4) and the lower layer (7) can be distinguished by coloring.

Images