Film and method for producing film
A film with a polypropylene and polyethylene blend, optimized for specific infrared and heat fusion properties, addresses peel strength instability in packaging films by ensuring consistent high peel strength and stability across varying heating conditions.
JP7750723B2Active Publication Date: 2025-10-07SUMITOMO CHEM CO LTD
Patent Information
- Application Number
- JP2021194406
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2021-11-30
- Publication Date
- 2025-10-07
- Estimated Expiration
- 2041-11-30
AI Technical Summary
Technical Problem
Existing packaging films face issues with varying peel strength stability due to fluctuations in heating temperatures during heat sealing, leading to inconsistent seal quality.
Method used
A film composition comprising 70% to 95% polypropylene and 5% to 30% polyethylene, with specific infrared peak intensity ratios, orientation degrees, and heat of fusion values, produced using an air-cooled inflation film-forming method, ensuring consistent high peel strength and stability.
Benefits of technology
The film achieves stable and high peel strength in heat-sealed seals, maintaining consistent seal quality despite variations in heating temperatures.
✦ Generated by Eureka AI based on patent content.
Smart Images
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Abstract
To provide a film capable of forming a seal having a comparatively high peel strength by heat sealing, and capable of forming a seal excellent in stability of peel strength.SOLUTION: A film satisfies the following requirement (1), requirement (2), requirement (3), and requirement (4), and has a thickness of 10 μm or more and 300 μm or less. Requirement (1): When the total mass of the film is 100 mass%, 70 mass% or more and 95 mass% or less of polypropylene, and 5 mass% or more and 30 mass% or less of polyethylene are contained. Requirement (2): The ratio of a peak strength of the polyethylene to a peak strength of polypropylene of the film determined by an infrared ATR method is 0.3 or more and 0.55 or less. Requirement (3): The degree of orientation of the polypropylene calculated by an infrared dichroic ratio is 0 or higher and 0.17 or lower. Requirement (4): The quantity of heat of fusion required from 20°C to 130°C is 50 J / g or more and 70 J / g or less.SELECTED DRAWING: None
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Citation Information
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