Duplex-Chamber Package

Abstract

This invention provides a duplex-chamber package that has a high level of water vapor barrier properties, can realize mixing of plural contents in a hermetically sealed state, and can reduce the elution of a material contained in the sheet of a duplex-chamber package material into the contents of the package. The duplex-chamber package comprises a package comprising a first sheet superimposed onto a second sheet, the peripheral part of the assembly having been sealed, a weakly sealed part for partitioning the inside of the package into two or more chambers having been provided in a part of the package. The first sheet (I) is a laminated sheet comprising a heat seal layer, a mass transfer layer and a mass transfer blocking layer, and the mass transfer blocking layer being interposed between the heat seal layer and the mass transfer layer. The second sheet (II) is a laminated sheet comprising a heat seal layer, a mass transfer layer, a mass transfer blocking layer and a moisture blocking layer, and the mass transfer blocking layer being interposed between the heat seal layer and the mass transfer layer.

Description

TECHNICAL FIELD[0001]This invention relates to a duplex-chamber package wherein plural contents are separately accommodated from each other and the plural contents can be mixed together by removing the separation at the time of use.BACKGROUND ART[0002]In recent years, there have been acknowledged as a problem of interactions between accommodated contents and various types of additives employed in packages such as antioxidants, lubricants, stabilizers, UV inhibitors and anti-blocking agents or monomer components left in plastic materials for packages or materials transferred from printed inks, adhesives, anchor coating agents and the like. The materials transferred from a package in itself to a content are used for the purpose of stably retaining the package over a long term or for the purpose of keeping strength during the course of storage and distribution, or are necessary for stabilizing film-forming properties in the step of manufacturing various types of films. Accordingly, it ...

AI Technical Summary

Benefits of technology

The invention is a duplex-chamber package that has excellent water vapor barrier properties and is suitable for medical use. The package is made up of two sheets that are sealed together, creating separate chambers. The package can be used to mix multiple contents in a sealed condition. The package is made using a special laminated sheet arrangement and a heat seal layer. The package is designed to provide a high level of protection and is suitable for medical use.

Problems solved by technology

In recent years, there have been acknowledged as a problem of interactions between accommodated contents and various types of additives employed in packages such as antioxidants, lubricants, stabilizers, UV inhibitors and anti-blocking agents or monomer components left in plastic materials for packages or materials transferred from printed inks, adhesives, anchor coating agents and the like.

Accordingly, it would be impossible as a matter of practice to provide packages wherein these materials have been completely removed.

In this connection, however, elution of a monomer component or a oligomer component, such as a dimer and more highly polymerized component, in an anchor coating agent used in small amounts, and additives or residual monomer components used in nylon and polypropylene cannot be completely prevented.

However, these packages actually have to be printed, making it substantially difficult to completely suppress elution of the printed ink to a content.

Moreover, an additional problem is involved in that the package formed in this way cannot be imparted with water vapor barrier properties at a very high level (of 0.5 g / m2.24 hours (90% R.H.) or below).

However, no consideration is given to the container with respect to the use of printed inks, adhesives, anchor coating agents therein, but this container is substantially a medical container co-extrusion molded in multilayer.

Moreover, no consideration is given to the influence of additives in employed polyethylene and the influence of residual monomers such as polyethylene at all.

Neither oriented polyethylene terephthalate films nor oriented polyamide films are used, mechanical strength is poor and water vapor barrier properties at a very high level of not greater than 0.5 g / m2.24 hours (90% R.H.) cannot be imparted.

In addition, a problem is involved in that because neither oriented polyethylene terephthalate films nor oriented polyamide films are used, mechanical strength is poor and water vapor barrier properties at a very high level of not greater than 0.5 g / m2.24 hours (90% R.H.) cannot be imparted.

In Japanese Laid-open Patent Application 2001-157704, there is pointed out a problem in that a monomer component of an adhesive used is dissolved out in a content at the time of retort sterilization.

However, this container fails to provide a function as a duplex-chamber container with a weakly sealed portion at a part thereof at all.

Although high water vapor barrier properties are imparted by using a glass-deposited film, the deposited film suffers from occurrence of cracking of the deposited layer at the time of retort sterilization or during the course of transportation and storage.

This film can not suppress the barrier properties from lowering.

Thus, very high water vapor barrier properties intended cannot be imparted and retained.

In other words, in conventional packages, there have been acknowledged as a problem of interactions between accommodated contents and various types of additives employed in packages such as antioxidants, lubricants, stabilizers, UV inhibitors, and anti-blocking agents, or monomer components left in plastic materials for packages, or materials transferred from printed inks, adhesives, anchor coating agents and the like.

In conventional packages that permit a content to be visually seen in use, these problems cannot be solved, and high water vapor barrier properties cannot be imparted thereto.

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