Self-Adhesive Article with Dual PSA Layers for Rough Wallpaper
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Solution Overview
Problem
Existing self-adhesive strips struggle to provide high holding power and non-destructive removal on rough surfaces, particularly painted woodchip wallpaper, due to insufficient bonding strength and surface damage during removal.
Innovation Solution
The development of self-adhesive articles with specific PSA layer combinations and foam carrier materials, including polybutadiene-polyvinylaromatic block copolymers, hydrocarbon resins, and soft resins, which offer improved adaptability and tensile strength for bonding to rough surfaces while allowing for residue-free removal by stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive strips are used on rough surfaces like painted woodchip wallpaper, then bonding to the surface is achieved, but bonding strength is insufficient and surface damage occurs during removal
Solution Approach 1:
The patent changes the physical parameters of the adhesive strip by introducing a foam carrier with specific density (20-500 kg/m³) and thickness (0.1-30 mm) parameters. This allows the adhesive to deform and adapt to rough surfaces while maintaining sufficient bonding strength and enabling damage-free removal through controlled elasticity
Solution Approach 2:
The patent uses composite material structure combining foam carrier material with pressure-sensitive adhesive layers. This composite structure provides both the adaptability needed for rough surfaces and the bonding strength required, while the foam's elastic properties enable non-destructive removal
2Adaptability or versatility
If foam carriers with low density are used to improve adaptability to rough surfaces, then bonding area increases, but tensile strength decreases
Solution Approach 1:
The patent optimizes the foam carrier parameters within specific ranges: density of 20-500 kg/m³ and thickness of 0.1-30 mm. This parameter optimization balances adaptability to rough surfaces with sufficient tensile strength for practical applications
Data Source
Figure 1
AI summary
A self-adhesive article comprising (i) at least one carrier material which comprises at least one foamed layer having a first surface A and a second surface B, the at least one foamed layer of the carrier material having a thickness of at least 500 µm und at most 1800 µm, a tensile strength in detachment direction of at least 500 kPa, a tensile elongation in detachment direction of at least 300 % and a compressive hardness of at least 50 kPa, (ii) a layer HKA of pressure-sensitive adhesive (PSA) assigned to the surface A, (iii) a PSA layer HKB assigned to the surface B, and (iv) optionally further layers; the PSA layers HKA and HKB may be two PSA layer combinations, in which case, for PSA layer combination 1, PSA layer HKA is a PSA layer HKA1 with particularly good properties for bonding to rough substrates, and PSA layer HKB is a PSA layer HKB1 with a tensile strength of at least 9 MPa, and, for PSA layer combination 2, PSA layer HKA is a PSA layer HKA2 and PSA layer HKB is a PSA layer HKB2, each of these layers, but independently of one another, featuring not only good properties of bonding to rough substrates but also sufficient tensile strength at the same time, is particularly suitable for bonding to rough substrates whilst possessing strippability.