Stretchable Film Anti-Blocking Structure
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Solution Overview
Problem
Conventional stretchable films used in laminates, such as those for sanitary articles, often experience delivery failures due to blocking issues when unwound from a winding body, which is not effectively addressed by existing technologies.
Innovation Solution
A stretchable film comprising a laminated structure of elastomer layers with outer layers containing fatty acid amides and metal soaps, specifically within the range of 0.75 wt% to 4 wt%, along with calcium carbonate and olefin-based elastomers, to prevent delivery failures and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stretchable film has high stretchability, then it can provide flexibility and elasticity for sanitary articles, but it causes delivery failure and blocking when unwound from a winding body
Solution Approach 1:
The patent changes the chemical composition parameters of the outer elastomer layers by incorporating specific fatty acid amides (0.75-4 wt%) and metal soaps (0.01-5 wt%), which modifies the surface properties and intermolecular forces to reduce blocking while preserving the bulk stretchability of the film
Solution Approach 2:
The patent creates a composite structure with three distinct elastomer layers, where the outer layers have different compositional characteristics (containing fatty acid amides and metal soaps) than the core layer, combining the stretchability of the elastomer matrix with the anti-blocking properties of the additive-containing outer layers
2Reliability
If the outer elastomer layers contain fatty acid amide and metal soap additives, then delivery failure is prevented, but the film structure becomes more complex
Solution Approach 1:
The patent applies local quality by concentrating the fatty acid amide and metal soap additives specifically in the outer elastomer layers (A1 and A2) rather than distributing them uniformly throughout the entire film, thereby achieving anti-blocking performance only where surface contact occurs during delivery, while keeping the core layer simpler
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed film structure prevents delivery failures by reducing contact area and improving heat and storage stability, allowing for continuous unwinding and integration into articles like diapers or masks without conspicuous wetting.
Implementation Method 1
each of the elastomer layer (A1) and the elastomer layer (A2) contains a fatty acid amide and a metal soap... a stretchable film that can prevent a delivery failure when delivered from a winding body
Implementation Method 2
improving heat and storage stability... each of the elastomer layer (A1) and the elastomer layer (A2) contains calcium carbonate
Implementation Method 3
A stretchable film according to one embodiment of the present invention includes a laminated film of a plurality of elastomer layers
Data Source
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AI summary
Provided is a stretchable film that can prevent a delivery failure when delivered from a winding body. Also provided is a stretchable laminate including such stretchable film. Still also provided is an article including such stretchable laminate. The stretchable film of the present invention includes a laminated film of a plurality of elastomer layers, wherein the stretchable film includes an elastomer layer (A1), an elastomer layer (B), and an elastomer layer (A2) in the stated order, wherein the elastomer layer (A1) and the elastomer layer (A2) are provided as outer layers, and wherein each of the elastomer layer (A1) and the elastomer layer (A2) contains a fatty acid amide.