Polyester film roll
By controlling charge distribution, resistivity, puncture strength, and other properties, the polyester film roll minimizes scratches and defects, meeting higher quality standards and improving yield in polarizing plate release applications.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- TORAY INDUSTRIES INC
- Filing Date
- 2022-07-01
- Publication Date
- 2026-06-02
AI Technical Summary
Existing polyester films fail to meet the increasing demands for higher precision and quality due to minute defects and scratches, which affect the quality of molded products.
The polyester film roll is configured with specific charge distribution, surface resistivity, puncture strength, static friction coefficient, and dimensional properties to minimize scratches and defects, ensuring charge distribution from the unwinding point to the core is within 0.9V and 0.6V in the width direction, with surface resistivity of 5 × 10^12 Ω/□ to 2 × 10^14 Ω/□, puncture strength of 0.5 N/μm to 2.5 N/μm, static friction coefficient of 0.20 to 0.70, and controlled thickness, roughness, and orientation angle.
The solution results in polyester film rolls with fewer scratches and defects, improving yield in subsequent processes, particularly in polarizing plate release applications, by enhancing the inspection process and maintaining product quality.
Smart Images
Figure 0007868430000001 
Figure 0007868430000002