Crosslinked Fibrous Wallpaper for Clean Peeling
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Solution Overview
Problem
Existing wallpaper technologies face challenges in easy application and peeling, especially when using adhesives other than synthetic fiber-mixed paper and methyl cellulose, as they often result in dimensional changes, joint clearance, or damage to the application surface during repapering.
Innovation Solution
A laminated sheet comprising a fibrous base material with a crosslinked product of an ionizing radiation-crosslinking material, combined with a resin layer, which allows for easy application and peeling by minimizing underwater elongation, regardless of the adhesive type used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a starch adhesive is used to adhere wallpaper, then the adhesive force between the backing paper and adhesive is strong, but interlaminar peeling occurs when old wallpaper is replaced, causing backing paper to remain on the application surface or damaging the application surface
Solution Approach 1:
The invention applies different functional properties to different parts of the system: the backing paper is designed with low underwater elongation to maintain dimensional stability, while the adhesive layer is designed with controlled peeling characteristics. This local differentiation allows strong adhesion during application while enabling clean peeling during replacement, resolving the contradiction between strong bonding and easy repair.
Solution Approach 2:
Instead of designing the adhesive to be permanently strong, the invention inverts the approach by designing the backing paper to be dimensionally stable (low elongation) so that the failure occurs cleanly at the adhesive interface rather than within the backing paper. This inversion of the stability focus enables both strong initial adhesion and clean subsequent peeling.
2Ease of operation
If backing paper with high underwater elongation is used, then the wallpaper can be applied after coating with adhesive, but dimensional changes occur after application causing joint clearance and protrusion
Solution Approach 1:
The invention changes the critical parameter of underwater elongation from high to low in the backing paper. By reducing the underwater elongation parameter, the backing paper maintains its dimensional stability when wet, preventing joint clearance and protrusion while still allowing easy application. This parameter change resolves the contradiction between ease of operation and manufacturing precision.
3Ease of repair
If wallpaper is designed to peel between backing paper and adhesive, then repapering is easy, but the adhesive force may be insufficient for proper adhesion
Solution Approach 1:
The invention performs preliminary action by designing the backing paper with low underwater elongation before the adhesive is applied. This preliminary dimensional stability ensures that when the adhesive sets, it bonds to a stable substrate, creating strong initial adhesion. The pre-established dimensional stability allows the adhesive to achieve full bonding strength while still permitting clean peeling during replacement.
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 enables easy application and peeling of the wallpaper without leaving residue or damaging the surface, even with non-methyl cellulose adhesives, making it suitable for general consumer use.
Implementation Method 1
the fibrous base material comprises a crosslinked product of an ionizing radiation-crosslinking material
Data Source
Figure 1
AI summary
An object of the present invention is to provide a novel laminated sheet and foamed laminated sheet (collectively referred to as "wallpaper or the like." More specifically, the object of the present invention is to provide a wallpaper or the like that can be easily applied after an application surface is coated with an adhesive and that can also be peeled off between the backing paper and the adhesive during repapering, even when a combination other than a synthetic fiber-mixed paper and a methyl cellulose adhesive is used. Specifically, the present invention provides a laminated sheet including a fibrous base material and at least a resin layer laminated on a fibrous base material, the fibrous base material containing a crosslinked product of an ionizing radiation-crosslinking material.