Low-E Glass PSA Sheet Waterproofing and Peel Control
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Solution Overview
Problem
Conventional pressure-sensitive adhesive (PSA) sheets used for protecting large surface area glass plates, such as those with Low-E layers, face challenges in maintaining efficient removal while ensuring waterproofness, as the adhesive strength needs to be limited to prevent heavy peel and corrosion, but this can compromise the waterproofness and adhesion tightness.
Innovation Solution
A method involving a PSA sheet with a surface hardness of 0.5 MPa or less, comprising a waterproof layer and a PSA layer, designed to enhance adhesion tightness and prevent water permeation, allowing for secure protection and easy removal, even on large glass plates with metal layers like silver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adhesive strength of the PSA is limited to prevent heavy peel and maintain efficient removal, then the ease of removal is improved, but the waterproofness and adhesion tightness deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the PSA layer thickness (5-20 μm) and surface hardness (0.2-0.5 MPa) to achieve the optimal balance between easy removal and waterproofness. By adjusting these physical parameters, the adhesive strength is optimized to provide sufficient water barrier function while maintaining light peel characteristics for efficient removal.
Solution Approach 2:
The patent uses composite materials by combining the PSA layer with a waterproof layer (release liner) to create a multi-layer protective sheet structure. This composite structure integrates the adhesive properties of the PSA with the waterproof properties of the release liner, achieving both easy removal and reliable waterproof protection simultaneously.
2Reliability
If the adhesive strength of the PSA is increased to improve waterproofness and adhesion tightness, then the reliability is improved, but the ease of removal deteriorates due to heavy peel
Solution Approach 1:
The patent resolves this contradiction by implementing precise parameter control, specifically limiting the PSA layer thickness to 5-20 μm and surface hardness to 0.2-0.5 MPa. These parameter constraints ensure the adhesive strength provides adequate waterproof protection while preventing excessive adhesion that would cause heavy peel and difficult removal.
3Productivity
If the surface area of the glass plate is enlarged to improve production efficiency, then the productivity is improved, but the adhesive area increases leading to heavy peel and reduced ease of removal
Solution Approach 1:
The patent addresses this contradiction through parameter changes in the PSA layer design. By controlling the PSA thickness (5-20 μm) and surface hardness (0.2-0.5 MPa), the adhesive strength is optimized to scale appropriately with larger surface areas, maintaining light peel characteristics even on large-format glass plates used in high-productivity manufacturing.
4Object-generated harmful factors
If the adhesive strength is reduced to prevent metal corrosion on Low-E layers, then the object-generated harmful factors are reduced, but the waterproofness deteriorates
Solution Approach 1:
The patent applies composite materials by integrating the PSA layer with a waterproof release liner to create a multi-layer protective sheet. This composite structure provides the necessary waterproof barrier to prevent water penetration and metal corrosion on Low-E layers, while the PSA layer's controlled adhesive strength ensures easy removal without leaving residue that could cause corrosion.
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 PSA sheet effectively prevents water permeation and corrosion on large glass plates, ensuring excellent waterproofness and light peel, enabling efficient production and handling of glass units with large surface areas.
Implementation Method 1
pressure-sensitive adhesive (or PSA; the same applies hereinafter) can be preferably used. In general, pressure-sensitive adhesive has characteristics of being in a soft solid (viscoelastic) state in a room temperature range and easily adhering to adherend under some pressure
Implementation Method 2
a waterproof protective sheet (PSA sheet) is used and usually the entire face of the Low-E layer of the glass plate is covered. By this, even if the glass plate is exposed to water in a washing step, etc., the area covered with the protective sheet is securely waterproofed
Implementation Method 3
The poorer wetting properties may indicate reduced tightness of adhesion to the adherend. The concept of tightness of adhesion here is different from the concept of adhesiveness (adhesion) which indicates the strength of adhesion; it rather refers to a state of air-tight (gap-free) contact between PSA and an adherend and to the level of tightness
Data Source
AI summary
Provided is a method for producing a glass unit. The method comprises a step (A) of obtaining a glass plate comprising a glass substrate and a Low-E layer placed on the glass substrate; a step (B) of applying a protective sheet to the Low-E layer surface of the glass plate; an optional step (C) of subjecting the glass plate to at least one process selected from the group consisting of transportation, storage, processing, washing and handling; a step (D) of removing the protective sheet from the glass plate; and a step (E) of assembling a glass unit using the glass plate. The protective sheet comprises a waterproof layer, and a PSA layer provided to at least one face of the waterproof layer. The PSA layer has a surface hardness of 0.5 MPa or less.