Pressure-Sensitive Adhesive Sheet With Waved Grooves
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Solution Overview
Problem
Pressure-sensitive adhesive sheets often form air pockets and irregularities when applied to surfaces due to the entry of air between the adhesive layer and the object, and existing solutions like lattice-like groove patterns either deform under pressure or are visually distracting, damaging decorative patterns.
Innovation Solution
A pressure-sensitive adhesive sheet with waved groove portions composed of convex and concave arcuate segments, where the wavelength and amplitude of these grooves differ, allowing for stable pressure distribution and air discharge without deforming the adhesive layer or being visually noticeable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lattice-like groove portions are formed with small pitch (about 400 μm or less) to discharge air, then air pocket formation is prevented, but the projecting portions between grooves are very small and deform easily under pressure from sticking tools, causing surface irregularities
Solution Approach 1:
The patent changes the pitch parameter of the groove portions from small (400 μm or less) to large (exceeding 400 μm), which transforms the projecting portions between grooves from very small to sufficiently large. This parameter change allows the projecting portions to withstand pressure from sticking tools without deforming, while still maintaining effective air discharge capability through the groove portions.
2Manufacturing precision
If the pitch between groove portions is increased to prevent deformation, then surface irregularities are reduced, but air becomes trapped between the projecting portions and the object surface, making it impossible to discharge air smoothly
Solution Approach 1:
The patent identifies and changes the critical pitch parameter to exceed 400 μm, which simultaneously resolves both contradictions: the increased pitch prevents projecting portion deformation while the groove portions remain sufficiently numerous and distributed to effectively discharge air, preventing air pocket formation.
3Object-affected harmful factors
If groove portions are formed regularly at small pitch to discharge air, then air pocket formation is prevented, but the regular pattern is easily recognized visually through the sheet-like base, damaging decorative patterns
Solution Approach 1:
The patent changes the pitch parameter from small to large (exceeding 400 μm), which reduces the number of groove portions per unit area. This parameter change makes the groove portions less visually noticeable through the sheet-like base, thereby preserving decorative patterns while still maintaining effective air discharge functionality.
Data Source
Figure 1~3(d)
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AI summary
A pressure-sensitive adhesive sheet that can be beautifully adhered to an adherend. The pressure-sensitive adhesive sheet (A) is characterized by the following. The sheet has a sheetlike base material (1) and, integrally superimposed on one major surface of the base material (1), a pressure-sensitive adhesive layer (2).The adhesive layer (2) on its surface has multiple corrugated groove portions (3) consisting of alternate continuation of convex circular arc groove portion (31) and concave circular arc groove portion (32). The multiple corrugated groove portions (3) are provided at intervals in the direction of the amplitude of the corrugated groove portions (3). Providing that any arbitrary two corrugated groove portions being adjacent to each other in the direction of the amplitude of the corrugated groove portions (3) consist of the one corrugated groove portion (3a) and the other corrugated groove portion (3b), the total wavelength (S1) of convex circular arc groove portion (31a) and concave circular arc groove portion (32a) of the one corrugated groove portion (3a) is different from the total wavelength (S2) of convex circular arc groove portion (31b) and concave circular arc groove portion (32b) of the other corrugated groove portion (3b), which convex circular arc groove portion (31b) and concave circular arc groove portion (32b) respectively correspond to the convex circular arc groove portion (31a) and concave circular arc groove portion (32a) constructing the one corrugated groove portion (3a).