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Patents

Heat-Shrinkable Polyester Film

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By: Karen McIntyre

Editor, Nonwovens Industry

Patented is a heat shrinkable polyester film, which satisfies the following requirements, (A) to (C): (A) when a square test piece cut off from the heat-shrinkable polyester film in a size of 10 cm x 10 cm is immersed in hot water at 70°C for five seconds, subsequently in water at 25°C for 10 seconds, and withdrawn, the heat shrinkage percentage of the test piece in the maximum shrinkage direction is 10 to 50%; (B) when a square test piece cut off from the heat-shrinkable polyester film in a size of 10 cm x 10 cm is immersed in hot water at 85°C for five seconds, subsequently in water at 25°C for 10 seconds, and withdrawn, the heat shrinkage percentage of the test piece in the maximum shrinkage direction is 70% or more and that in the direction orthogonal thereto, 10% or less; and (C) when a square test piece is cut off from the heat-shrinkable polyester film previously 10% heat shrunk in the maximum shrinkage direction in a size of 10 cm x 10 cm is immersed in hot water at 95°C for five seconds, subsequently in water at 25°C for 10 seconds, and withdrawn, the heat shrinkage percentage of the test pieces in the maximum shrinkage direction are designated respectively in a specific manner.

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