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Biaxially stretched polyamide film and its manufacturing method

A technology of biaxial stretching and polyamide film, which is applied to other household appliances, household appliances, household components, etc., can solve the problems of low strength, achieve good tension, balance shrinkage, and reduce positioning deviation

Active Publication Date: 2020-05-19
UNITIKA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In heat sterilization of container packaging, since the contents and air in the container will expand, the internal pressure will be applied to the cover material which is thinner and weaker than the main body of the container, and the cover material will be stretched. Therefore, when returning to normal temperature It is unavoidable that the lid material is loose or wrinkled

Method used

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  • Biaxially stretched polyamide film and its manufacturing method
  • Biaxially stretched polyamide film and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (Manufacture of biaxially stretched polyamide film)

[0079] As the polyamide resin, a polyamide 6 resin (A1030BRF manufactured by Unitika Co., Ltd.) with a relative viscosity of 3.0 was used, melted and extruded from a T die at a temperature of 260° C., and cooled on a roller at 15° C. to obtain a substantially free-form resin with a thickness of 150 μm. Oriented unstretched film.

[0080] The obtained unstretched film was immersed in a warm water bath at 40° C. for 10 seconds, and then immersed in a warm water bath at 60° C. for 100 seconds to perform a water absorption treatment. The moisture content of the unstretched film was set at 4.0%.

[0081] The unstretched film that has undergone water absorption treatment is introduced into a tenter type simultaneous biaxial stretching machine driven by a linear motor. Simultaneous biaxial stretching was carried out under the condition of 3.3 times.

[0082] Next, the film after simultaneous biaxial stretching is heat-tre...

Embodiment 2～9

[0088] Embodiment 2~9, comparative example 1~10

[0089] A biaxially stretched polyamide film was obtained in the same manner as in Example 1 except that the draw ratio, heat treatment temperature, and relaxation rate were changed as shown in Tables 1 and 2. Tables 1 and 2 show the film production conditions, shrinkage rate, and evaluation results as a cover material.

[0090] Table 1

[0091]

[0092] Table 2

[0093]

[0094] Since the shrinkage ratio and the difference between the shrinkage ratios of the biaxially stretched polyamide films of Examples 1 to 9 were within the range specified by the present invention, the obtained cover materials had no printing deformation even after the heat sterilization treatment and had excellent aesthetics.

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Abstract

A biaxially stretched polyamide film, characterized in that the shrinkage measured after boiling in boiling water at 100° C. for 5 minutes is 2.0 to 5.0 in both the machine direction (MD) and the transverse direction (TD) during film formation. %, the difference between the shrinkage rate in MD and the shrinkage rate in TD is 0.5% or less, and the difference between the shrinkage rate in the 45° direction and the shrinkage rate in the 135° direction relative to TD is 0.5% or less.

Description

technical field [0001] The present invention relates to a biaxially stretched polyamide film excellent in shrinkage balance. Background technique [0002] Container packages such as beverages, sweets, and cooked food packaged in synthetic resin containers or composite containers are sold after filling the container with the contents and sealing it with a lid material made of a laminated film. The container-packaged products include those distributed in a chilled state, but generally also include those distributed at room temperature, which are heat-sterilized such as boiling treatment (boil treatment) or retort treatment (retort treatment) after sealing. [0003] In heat sterilization of container packaging, since the contents and air in the container will expand, the internal pressure will be applied to the cover material which is thinner and weaker than the main body of the container, and the cover material will be stretched. Therefore, when returning to normal temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/16
CPCB29C55/16B29C55/005B29K2077/00B29L2031/712
Inventor 铃木知治
Owner UNITIKA LTD
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