Acrylic Foam Graphic Sheet for Low-Strength Substrates
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Solution Overview
Problem
Graphic sheets affixed to substrates like wallpaper often detach the substrate when peeled, causing damage and requiring time and labor for replacement, especially in applications like temporary decorations or advertisements where frequent renewal is needed.
Innovation Solution
A graphic sheet with a base film layer and a tacky acrylic foam layer containing 20% or more of a unit derived from ethyl acrylate, allowing for strong adhesion and easy removal without damaging the substrate, using a method that involves forming and curing the acrylic foam layer for application and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If adhesive sheets with sufficient adhesive force are used to prevent detachment from the substrate, then the graphic sheet can be firmly affixed to the substrate, but when the graphic sheet is peeled away, the substrate may be peeled away at the same time or damaged
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by specifying it contains an acrylic polymer with 20 mass% or more of a unit derived from ethyl acrylate. This compositional parameter change enables the adhesive to achieve sufficient bonding force to wallpaper while maintaining the ability to be removed without damaging the substrate, thus resolving the contradiction between strong adhesion and substrate protection.
2Duration of action of stationary object
If conventional adhesive sheets are used for temporary decorations or advertisements, then the graphic sheet can be affixed to the substrate, but when renewal is needed, time and labor are required to remove the wallpaper and apply new wallpaper
Solution Approach 1:
The patent extracts the adhesive layer as a separate, replaceable component with specific chemical properties (acrylic polymer containing 20 mass% or more of ethyl acrylate units). This extracted adhesive layer provides temporary bonding during the service period but can be cleanly removed without taking the substrate (wallpaper) with it, thus eliminating the need for time-consuming wallpaper replacement while maintaining adequate service duration for temporary decorations and advertisements.
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 graphic sheet provides sufficient adhesive force for substrates with low strength, enabling easy renewal without adhesive residue or substrate damage, suitable for frequent use in interior applications.
Implementation Method 1
adhesive sheets having sufficient adhesive force with respect to the substrate
Implementation Method 2
when the affixed graphic sheet is peeled away, in some cases the wallpaper or the like that serves as the substrate may be also peeled away at the same time, or is damaged
Data Source
AI summary
A graphic sheet is provided that can be affixed with sufficient adhesive force onto wallpaper, a poster, or other substrate having comparatively low strength, and can be easily renewed without damaging the substrate, which is the underlying layer. A graphic sheet of an embodiment of the present disclosure includes: a base film layer having a first surface and a second surface situated on an opposite side of the first surface; and a tacky acrylic foam layer disposed on or above the second surface of the base film layer. The acrylic foam layer contains an acrylic polymer having 20 mass % or more of a unit derived from ethyl acrylate.