Multilayer Adhesive Tape Spunbond Outer Layer
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Solution Overview
Problem
Pressure-sensitive adhesive tapes with high void ratios cause skin stuffiness and eruption due to adhesive invasion and reduced touch quality, and existing methods for preventing adhesive leakage and improving manufacturing costs are inefficient.
Innovation Solution
A laminate structure using a combination of substrates with different properties, where the outermost layer is composed of a spunbond nonwoven fabric to prevent adhesive penetration and maintain void ratio, allowing for direct adhesive application without leakage, thereby reducing manufacturing costs and improving skin compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a support with high void ratio is used, then the touch is good and application discomfort is reduced, but the adhesive excessively invades into the spaces of the support reducing adhesive strength
Solution Approach 1:
The support is divided into multiple layers with different functions: the first layer (contacting skin) maintains high void ratio for good touch, while the second layer (contacting adhesive) has lower void ratio to prevent adhesive invasion. This segmentation allows each layer to optimize its properties independently.
Solution Approach 2:
Different regions of the support have different void ratios tailored to their specific functions. The skin-contacting region has high void ratio for comfort, while the adhesive-contacting region has lower void ratio to restrain adhesive penetration. This local differentiation resolves the contradiction between touch quality and adhesive strength.
2Strength
If a filling treatment is applied to prevent adhesive invasion, then adhesive strength is maintained, but the void ratio lowers and touch is deteriorated
Solution Approach 1:
The filling treatment is applied selectively only to the second layer that contacts the adhesive, while the first layer contacting the skin remains unfilled to maintain high void ratio and good touch quality. This segmented application resolves the contradiction between adhesive strength and touch quality.
3Object-generated harmful factors
If transfer method is used to laminate adhesive, then adhesive leakage is prevented, but manufacturing expenses increase due to additional sheets
Solution Approach 1:
The support structure is designed in advance with a second layer having lower void ratio specifically to prevent adhesive leakage during direct application. This preliminary structural preparation eliminates the need for transfer sheets, reducing manufacturing costs while still preventing adhesive leakage.
4Ease of manufacture
If direct application of adhesive is used, then manufacturing costs are reduced, but adhesive invades into substrate spaces losing pressure-sensitive adhesive function
Solution Approach 1:
The support structure has spatially differentiated void ratios: the adhesive-contacting region (second layer) has lower void ratio to prevent adhesive invasion and maintain adhesive function, while enabling direct application method for cost reduction.
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 effectively prevents adhesive invasion and maintains skin compatibility, reducing skin stuffiness and eruption while lowering manufacturing costs through a laminate structure that allows for direct adhesive application without compromising touch quality.
Implementation Method 1
the support is subjected to a filling treatment with a filling agent
Implementation Method 2
a laminate structure using a combination of substrates with different properties, where the outermost layer is composed of a spunbond nonwoven fabric to prevent adhesive penetration
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a pressure-sensitive adhesive tape or sheet, which comprises a support and a pressure-sensitive adhesive layer disposed on one side of the support, in which the support comprises a first substrate and a second substrate disposed on at least one side of the first substrate and is treated with a filling agent, the first substrate includes a melt blow nonwoven fabric, the second substrate includes a span bond nonwoven fabric having a bulk density of from 0.05 to 0.3 g/cm3, and the second substrate is arranged as the outermost layer on the support side; a pressure-sensitive adhesive tape or sheet, which comprises a laminate of a plurality of substrates and a pressure-sensitive adhesive layer disposed on at least one side of the laminate, the plurality of substrates being treated with a filling agent, and the pressure-sensitive adhesive tape or sheet having a loop hardness of from 15 to 60 mN; and a process for producing a pressure-sensitive adhesive tape or sheet in which a plurality of substrates constituted of paper and/or napkin are laminated and a pressure-sensitive adhesive layer is disposed on at least one side of the laminated substrates, the process comprising applying a filling agent on the plurality of substrates to conduct a filling treatment, and then coating an adhesive solution by a direct application method, followed by drying.