Partial Silicone Release Liner for Grip Aid Attachment
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Solution Overview
Problem
Existing release liners face challenges in achieving both good release properties against pressure-sensitive adhesives with high adhesive strength on low-energy substrates and easy attachment of gripping aids, often requiring conflicting design choices.
Innovation Solution
A release liner with a specific layer structure comprising a continuous silicone release layer, a polyolefin or polyethylene terephthalate film, and a partially siliconized layer with defects, allowing for easy peeling and attachment of gripping aids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous silicone release layer is applied on both sides of the liner, then good release properties are achieved, but attachment of gripping aids becomes difficult
Solution Approach 1:
The patent applies different surface treatments to different areas of the liner. The first side maintains a continuous silicone release layer for optimal release properties, while the second side has a discontinuous silicone layer with 46-95% surface coverage, creating local variations in adhesion. This allows gripping aids to be attached to the second side where the reduced silicone coverage provides sufficient adhesion, while the first side retains its excellent release characteristics.
2Reliability
If the silicone layer coverage is increased to improve release properties, then separation from adhesive becomes easier, but attachment of gripping aids becomes more difficult
Solution Approach 1:
The patent segments the silicone release layer into two distinct configurations: a continuous layer on the first side for optimal adhesive separation, and a discontinuous layer on the second side with 46-95% coverage for gripping aid attachment. This segmentation allows each side to be optimized for its specific function without compromising the other.
Solution Approach 2:
Different surface characteristics are created on different sides of the liner. The first side has full silicone coverage (100%) for maximum release properties, while the second side has partial coverage (46-95%), creating local quality differences that enable both functions to coexist.
3Ease of operation
If the silicone layer is made discontinuous to facilitate gripping aid attachment, then grip aid attachment becomes easier, but release properties against high-strength adhesives deteriorate
Solution Approach 1:
The solution segments the silicone layer application: continuous on the adhesive-contact side for reliable release, discontinuous on the opposite side for gripping aid attachment. This segmentation ensures that release properties are maintained where needed while enabling gripping aid attachment where appropriate.
Solution Approach 2:
The patent creates local quality differences by applying continuous silicone coverage on the first side for optimal release properties against high-strength adhesives, while applying discontinuous coverage (46-95%) on the second side to facilitate gripping aid attachment, thus optimizing each region for its specific function.
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 liner provides effective separation from pressure-sensitive adhesives with high adhesive strength on low-energy substrates, facilitating easy peeling and unwinding while enabling secure attachment of gripping aids.
Implementation Method 1
the release liners are paper or film substrates coated with an adhesive coating (also known as a deadhesive or anti-adhesive compound) to reduce the adhesion of adhesive products to these surfaces (release function)
Data Source
AI summary
The invention relates to a release liner having an extensive release effect, on both sides, directly in relation to adhesive masses with a good adhesive force even on low-energy substrates. This is achieved by with a release liner comprising an outer, continuous silicon release layer (SR1), a film (BF) containing up to at least 80 wt.%, in relation to the total weight of the film, of a polyolefin or polyethylene terephthalate in relation to the total weight of the film, a layer (PER) containing up to at least 80 wt.% of polyethylene, in relation to the total weight of the layer (PER), and an outer silicon release layer (SR2) on the layer (PER), wherein the layer (SR2) has missing areas such that 46% to 95% of the surface of the layer (PER) is covered by the layer (SR2). The invention also relates to a method for producing a release liner of this type and to the use thereof for covering a synthetic-rubber-based adhesive mass, wherein the adhesive mass is positioned on the silicon release layer (SR1).