Multi-Layer Protective Sheet Resilient Layer Adhesive Removal
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Solution Overview
Problem
Conventional polyurethane-based protective sheets often fail to retain the glossy appearance of painted surfaces and suffer from reduced flexibility and potential interlayer delamination due to additional layers, leading to adhesive residue issues when removed.
Innovation Solution
A multi-layer protective sheet configuration with a resilient layer between the carrier layer and the adhesive layer, which enhances energy absorption and dispersal, balances layer properties, and improves recoverability, allowing for cleaner removal without residual adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional layers are added to improve gloss retention and environmental resistance, then protective properties are improved, but flexibility decreases
Solution Approach 1:
The protective sheet is divided into multiple functional layers: a polyurethane carrier layer providing flexibility and conformability, and a separate topcoat layer providing gloss retention and environmental resistance. This segmentation allows each layer to optimize its specific function without compromising the overall flexibility of the sheet.
Solution Approach 2:
The invention uses a composite structure combining polyurethane material in the carrier layer with a different material composition in the topcoat layer. This composite approach enables the sheet to simultaneously achieve flexibility from the polyurethane base and protective properties from the specialized topcoat, resolving the contradiction between durability and flexibility.
2Reliability
If additional layers are added to improve protective properties, then gloss retention is improved, but interlayer delamination risk increases
Solution Approach 1:
The invention carefully controls the thickness parameters of each layer, keeping the topcoat layer relatively thin compared to the carrier layer. This parameter optimization ensures adequate adhesion between layers while maintaining the protective function, preventing delamination issues that would arise from excessively thick additional layers.
3Strength
If polyurethane films are used for protection, then abrasion resistance is improved, but glossy appearance retention is insufficient
Solution Approach 1:
The invention combines polyurethane material in the carrier layer, which provides abrasion resistance, with a specially formulated topcoat layer that provides superior gloss retention. This composite structure allows the sheet to simultaneously achieve both abrasion resistance from the polyurethane base and glossy appearance retention from the optimized topcoat, resolving the contradiction between these two protective properties.
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 solution provides improved flexibility, reduced adhesive residue, and enhanced recoverability, enabling effective protection and easy application to non-planar surfaces while maintaining a glossy appearance.
Implementation Method 1
a resilient layer between the carrier layer and the adhesive layer, which enhances energy absorption and dispersal
Implementation Method 2
enhances energy absorption and dispersal
Implementation Method 3
an adhesive layer on an opposite major surface of the resilient layer
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
Multi-layer protective sheets of the invention are useful in a range of indoor and outdoor applications in, for example, the transportation, architectural and sporting goods industries. In one embodiment, a multi-layer protective sheet comprises sequential layers as follows: optionally, a topcoat layer; a carrier layer; a resilient layer; and an adhesive layer. Protective sheets of the invention are advantageously not only capable of protecting a surface, but also capable of being more cleanly removed therefrom than conventional protective sheets without resilient layers between the carrier layer and adhesive layer therein.