Biaxially oriented polyester film roll

The polyester film roll with controlled winding hardness and friction coefficients addresses issues of wrinkles and defects, ensuring high-quality secondary processing by minimizing defects and maintaining film stability during coating and vapor deposition.

JP7875487B2Active Publication Date: 2026-06-18TOYOBO CO LTD
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Patent Information

Application Number
JP2025040409
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2018-10-30
Filing Date
2025-03-13
Publication Date
2026-06-18
Estimated Expiration
2039-10-25

AI Technical Summary

Technical Problem

Biaxially oriented polyester films used in packaging face issues with wrinkles, surface defects, and winding misalignment, leading to variations in the quality of coated or vapor-deposited films, with the causes of these issues remaining unclear.

Method used

A polyester film roll design with controlled winding hardness variation, specific friction coefficients, and defined thickness and height parameters, ensuring minimal wrinkles, defects, and alignment, suitable for secondary processing.

Benefits of technology

The film roll achieves reduced wrinkles and defects, preventing quality degradation during secondary processing, enhancing the uniformity and stability of coated or vapor-deposited films, and reducing defects like static marks and discharge marks.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To provide a polyester film roll that has less wrinkles and defects on the film surface and no winding deviation and is suitable for secondary processing such as coating and vapor deposition.SOLUTION: A polyester film roll formed by winding a biaxially oriented polyester film around a core satisfies following requirements (1)-(3). (1) The polyester film roll has an average winding hardness of the surface in the range of 500 or more and 700 or less. (2) The polyester film roll has a degree of variability of winding hardness of the surface of 1% or more and 5% or less in the film width direction. (3) The polyester film roll has a degree of variability of winding hardness of 3% or more and 10% or less from the surface to the core.SELECTED DRAWING: Figure 4
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Citation Information

Patent Citations

  • Winding method for polyester film

    JP1987222954A

  • Method of winding film into roll

    JP1988252853A

  • Production of transparent gas barrier film

    JP1996092727A

  • Vapor deposited biaxially oriented polyester film

    JP1998119172A

  • Polyester film for transparent deposition

    JP1999010725A