Adhesive Tape Preparation Using Printed Ink Layer Backing
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Solution Overview
Problem
Conventional tape preparations face issues such as easy peeling off at joint parts, sweating-induced detachment, difficulty in handling due to high flexibility, poor conformability, and adverse effects like rash or marks, especially when using elastic materials like polyvinyl chloride or polyester films as backing.
Innovation Solution
A tape preparation is developed by laminating a drug-containing adhesive layer on a printed ink layer side of a cover film, with a release film covering the adhesive layer, allowing the printed ink layer to serve as a backing, which is easier to handle and provides better conformability without inhibiting the adhesive layer's resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If elastic materials such as polyvinyl chloride film or polyester film are used as backing to ensure conformability, then conformability at application site is improved, but the tape preparation becomes difficult to handle and frequently fails in application
Solution Approach 1:
The patent uses a knit fabric backing that provides flexibility and conformability while maintaining sufficient hardness for easy handling. The knit structure allows the tape to adapt to body contours without being overly flexible, solving the contradiction between conformability and ease of application.
Solution Approach 2:
The patent combines knit fabric with nonwoven fabric in a laminated structure. The knit fabric provides conformability and elasticity, while the nonwoven fabric layer adds structural support and hardness. This composite structure resolves the contradiction by integrating materials with complementary properties.
2Adaptability or versatility
If the backing is made thin to ensure conformability, then conformability at application site is improved, but the tape preparation lacks sufficient hardness and becomes difficult to handle
Solution Approach 1:
The patent laminates knit fabric (providing conformability) with nonwoven fabric (providing hardness and structural support). This composite structure allows the tape to have both thin-profile conformability and sufficient hardness for handling, resolving the contradiction between these two properties.
Solution Approach 2:
The patent applies different material properties to different layers: the knit fabric layer provides local conformability and elasticity where needed, while the nonwoven fabric layer provides overall structural hardness. This local differentiation of material qualities resolves the contradiction.
3Strength
If polyvinyl chloride film or polyester film is used as backing to provide structural support, then hardness is improved, but sealing performance causes sweating and tape preparation may peel off
Solution Approach 1:
The patent replaces impermeable plastic films with a knit fabric structure that is inherently permeable to moisture. The knit fabric allows sweat to pass through while maintaining structural support, eliminating the sweating problem while preserving hardness through the laminated nonwoven fabric layer.
Solution Approach 2:
The knit fabric acts as a porous material that allows moisture vapor transmission. This porous structure prevents the buildup of sweat under the tape while maintaining the structural integrity provided by the nonwoven fabric layer, resolving the contradiction between hardness and sweating prevention.
4Reliability
If highly adhesive preparation is designed to prevent peeling off, then reliability is improved, but adverse effects such as damaged keratin and internal hemorrhage occur when peeled off from affected area
Solution Approach 1:
The patent changes the adhesive parameters by using a moderate-strength adhesive that balances retention with safe removal. The adhesive is formulated to maintain reliable bonding during use but allows painless removal without damaging keratin or causing internal hemorrhage, resolving the contradiction between adhesive strength and tissue safety.
Solution Approach 2:
The patent converts the potential harm of strong adhesive bonding into a benefit by carefully controlling adhesive strength to be just sufficient for reliability during use, but not excessive enough to cause tissue damage upon removal. This balanced approach turns the potential harm of strong adhesion into a beneficial moderate adhesion that ensures both retention and safe removal.
Data Source
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AI summary
A tape preparation is provided which does not use a backing such as a plastic film, knit or a woven fabric, or a nonwoven fabric, has very high conformability to skin, and is easy to use at the time of application. There is provided a tape preparation 1 that is produced by laminating a drug-containing adhesive layer 4 on the printed ink layer 3 side of a cover film 2 with printing thereon and covering the drug-containing adhesive layer with a release film 5. In this tape preparation, the adhesive strength between the cover film and the printed ink layer is higher than the adhesive strength between the drug-containing adhesive layer and the release film, and the adhesive strength between the printed ink layer and the drug-containing adhesive layer is higher than the adhesive strength between the cover film and the printed ink layer.