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
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- TOYOBO CO LTD
- Filing Date
- 2025-03-13
- Publication Date
- 2026-06-18
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.
Smart Images
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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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