Multilayer Body with Release Layer for Blocking Resistance
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Solution Overview
Problem
Sheets made from 4-methyl-1-pentene-based polymers tend to become soft and adhesive at room temperature, leading to blocking issues when stacked, resulting in permanent deformation and deviation during storage, as they lack effective blocking resistance and shape retention.
Innovation Solution
A multilayer body is developed with a 4-methyl-1-pentene-based polymer sheet and a release layer on at least one surface, featuring specific dynamic viscoelastic properties and a static friction coefficient to prevent blocking and deformation, comprising a polymer blend with a release layer formed from synthetic resins like polyolefin or polyvinyl alcohol, and a controlled thickness and tensile load to maintain shape integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 4-methyl-1-pentene-based polymer sheet is used, then excellent heat resistance, water resistance, and solvent resistance are achieved, but the sheet becomes soft and adhesive at room temperature causing blocking when stacked
Solution Approach 1:
A release layer is introduced as an intermediary between the 4-methyl-1-pentene-based polymer sheet and other sheets. This release layer has a static friction coefficient of 0.05 or less, preventing direct contact and adhesion between sheets while allowing easy peeling. The release layer acts as a mediator that resolves the blocking issue without affecting the excellent heat resistance, water resistance, and solvent resistance of the polymer sheet itself.
2Ease of operation
If the sheet is made soft to improve flexibility, then ease of handling is improved, but permanent deformation occurs when blocked sheets are peeled off
Solution Approach 1:
The release layer serves as a protective intermediary that prevents direct blocking between sheets. By maintaining a friction coefficient of 0.05 or less, it allows the sheet to remain soft and flexible for easy handling while preventing the conditions that cause permanent deformation during peeling operations.
Solution Approach 2:
The static friction coefficient of the release layer is precisely controlled to be 0.05 or less. This parameter change creates a low-friction interface that prevents blocking while allowing the sheet to maintain its softness and flexibility without suffering permanent deformation during handling and peeling operations.
3Object-generated harmful factors
If a release film is used to suppress blocking, then blocking is reduced, but deviation between sheet and release film occurs during storage
Solution Approach 1:
The static friction coefficient of the release layer is precisely controlled to be 0.05 or less, which is sufficiently low to prevent blocking while being high enough to maintain stable adhesion during storage. This optimized friction parameter prevents deviation between the sheet and release film while still effectively suppressing blocking.
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 multilayer body effectively suppresses permanent deformation and deviation during storage by enhancing blocking resistance and shape retention, ensuring the sheets can be easily unwound without distortion.
Implementation Method 1
both surfaces of the release layer have a static friction coefficient of 0.2 or more with respect to the sheet
Implementation Method 2
the sheet has at least one or more temperatures showing a local maximum value of a loss tangent (tan δ), which is obtained by dynamic viscoelasticity measurement
Data Source
AI summary
A multilayer body includes two or more lamination units, each of which includes a sheet containing a 4-methyl-1-pentene-based polymer, and a release layer that is disposed on at least one surface of the sheet, the sheet preferably has at least one or more temperatures showing a local maximum value of a loss tangent (tan δ), which is obtained by dynamic viscoelasticity measurement under conditions of a temperature rising rate of 4° C./min, a frequency of 1.59 Hz, and a strain amount of 0.1%, in a range of 10° C. or higher and 100° C. or lower, the local maximum value of the loss tangent is preferably 0.5 or more and 3.5 or less, and both surfaces of the release layer preferably have a static friction coefficient of 0.2 or more with respect to the sheet.