JP2016214395A - Medicine packaging film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medicine packaging film which has a three-layered structure, is preservable under a high temperature, and can be easily torn.SOLUTION: A medicine packaging multi-layered film comprises three layers including: an outer layer made of linear low-density polyethylene having a density of 0.910 to 0.930 g/cmand fluidity of 0.5 to 0.930 g/10 min at 190°C; an intermediate layer which is made of the linear low-density polyethylene having a density of 0.910 to 0.930 g/cmand fluidity of 0.5 to 0.930 g/10 min at 190°C and cyclic polyethylene having a density of 1.020 g/cmand a glass transition temperature of 100°C or more and includes the cyclic polyethylene at a ratio of 40% or more and less than 60%; and an inner layer made of a low-density polyethylene having a density of 0.910 to 0.930 g/cmor the linear low-density polyethylene having a density of 0.910 to 0.930 g/cmand fluidity of 0.5 to 0.930 g/10 min at 190°C.SELECTED DRAWING: None

Description

  The present invention relates to a film for packaging pharmaceutical products having a three-layer structure that can be stored easily even at high temperatures.

The packaging bag for enclosing the contents is sealed by melting the film with heat or the like.
When opening a packaging bag, it may be opened using a blade, but it may be opened by hand when there is no tool.
However, it is difficult to tear the film cleanly when opened by hand, and there is a possibility that powdered and granular contents may pop out when opened.

  In order to solve the above-mentioned problems, a film has been developed in which the material of the bag is devised to be easily torn.

  Patent Document 1 describes an easily tearable film having excellent longitudinal and lateral tearability.

  The packaging bag described in Patent Document 1 has improved ease of tearing, but has a low glass transition point of the material, and may be deteriorated when stored in a place with poor air permeability such as a warehouse that is hot in summer.

Patent No. 5646222

  The present invention has been made to solve the problems of the prior art as described above, and provides a film that is easy to tear and easy to store.

The invention according to claim 1 has an outer layer made of linear low density polyethylene having a density of 0.910 to 0.930 g / cm ³ and a fluidity at 190 ° C. of 0.5 to 0.930 g / 10 min.
Density of 0.910~0.930g / cm ^3, a glass transition temperature fluidity at 190 ° C. is a linear low density polyethylene and a density 1.020g / cm ³ of 0.5~0.930g / 10min An intermediate layer comprising a cyclic polyethylene having a temperature of 100 ° C. or higher and containing the cyclic polyethylene in a proportion of 40% or more and less than 60%, and a low density polyethylene having a density of 0.910 to 0.930 g / cm ³ or a density of 0.910. The present invention relates to a multilayer film for pharmaceutical packaging composed of three inner layers composed of linear low-density polyethylene having a flowability at 190 ° C of 0.5 to 0.930 g / 10 min at ˜0.930 g / cm ³ .

  According to the first aspect of the present invention, there is provided a pharmaceutical packaging film that has an excellent balance between seal strength and cutability, is easy to tear and can be stored even at high temperatures.

  Hereinafter, preferred embodiments of the packaging bag according to the present invention will be described.

The packaging bag of this invention takes the structure which consists of an outer layer (laminate layer), an intermediate | middle layer (core layer), and an inner layer (seal layer).
The outer layer is composed of linear low density polyethylene (hereinafter referred to as C4-LLD), and the intermediate layer is composed of C4-LLD and cyclic polyolefin (hereinafter referred to as COC) and inner layer C4-LLD or polyethylene (hereinafter referred to as LDPE).
C4-LLD is a linear structure having no branches, whereas LDPE is a branched structure having branches.

In view of ease of tearing, the density of C4-LLD is preferably 0.910 to 0.930 g / cm ³ , more preferably 0.915 to 0.925 g / cm ³ .
The fluidity of C4-LLD is 0.5 to 2.0 g / 10 min at 190 ° C., preferably 0.915 to 0.925 g / 10 min.
190 ° C. is a temperature generally used when measuring the melt viscosity of a resin.
By having fluidity within this range, unevenness cannot be produced when the film raw materials are mixed, and film processing stability and appearance are improved.

The density of COC is preferably set to 1.020 g / cm ³ and the glass transition temperature to 100 ° C. or higher because it does not affect the quality even if it is stored at high temperatures in summer.

LDPE having a density of 0.910 to 0.930 g / cm ³ is preferable from the viewpoint of heat sealability.

In the present invention, the inner layer may be provided with antistatic properties.
By adding antistatic properties, it is possible to prevent the generation of static electricity and prevent powdered and granular contents from sticking to the packaging material and becoming difficult to take out.

The present invention may be used as a packaging material only with a film, but may be used as a sealant film after being laminated with another film.

Since the present invention has a three-layer structure having the above-described configuration, the tear strength is low and the tear is easy to tear, and tearing in the longitudinal and lateral directions is easy.

The thickness of the film is preferably 50 μm or less, and preferably 30 μm or more from the viewpoint of stability of seal strength.
The thickness ratio of the outer layer: intermediate layer: inner layer may be 1: 1: 1 or may be a ratio of 1: 1.6: 1.
Table 1 below shows the test results comparing the thickness ratio of each layer according to the present invention between 1: 1: 1 and 1: 1.6: 1.
The tensile test uses the method according to JIS K-7127. Specifically, a film cut to a certain width is fixed, one side is fixed, the other is pulled at a tensile speed of 50 mm / min, and the load when the film is cut is measured. It was.
As for the tear strength, an Elmendorf tear test was performed based on JIS K-7128.
From the table below, it was found that the ratio of the thickness of the three layers was 1: 1.6: 1 and the tensile elongation at break in the perpendicular direction was low and the film was easily torn.

The present invention is a multi-layer film for packaging pharmaceuticals that is easy to tear, and has a glass transition temperature of 100 ° C. or higher, so that the quality is not affected even when stored at high temperatures in summer.

Claims (1)

An outer layer made of linear low density polyethylene having a density of 0.910 to 0.930 g / cm ³ and a fluidity at 190 ° C. of 0.5 to 0.930 g / 10 min;
Density of 0.910~0.930g / cm ^3, a glass transition temperature fluidity at 190 ° C. is a linear low density polyethylene and a density 1.020g / cm ³ of 0.5~0.930g / 10min An intermediate layer comprising a cyclic polyethylene having a temperature of 100 ° C. or higher and containing the cyclic polyethylene in a proportion of 40% or more and less than 60%, and a low density polyethylene having a density of 0.910 to 0.930 g / cm ³ or a density of 0.910. A multilayer film for pharmaceutical packaging composed of three inner layers composed of linear low-density polyethylene having a fluidity at 190 ° C of 0.5 to 0.930 g / 10 min at ˜0.930 g / cm ³ .