Low-Adhesion Interliner Composite for Stable Adhesive Tape Winding
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Solution Overview
Problem
Adhesive tapes with a pressure-sensitive and heat-activated adhesive layer face instability during processing, winding, and storage due to separation of the interliner, leading to surface damage and unwinding issues.
Innovation Solution
A composite system with a double-sided adhesive tape featuring a pressure-sensitive adhesive layer covered by a release liner and a weakly adhesive interliner on the heat-activated side, ensuring stable guidance and protection against edge sticking, while minimizing surface damage during processing and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional release liner is used on the heat-activated adhesive layer, then the tape can be easily unwound and protected from contamination, but the interliner separates during processing and storage causing instability and surface damage
Solution Approach 1:
The patent changes the adhesive parameter from non-adhesive (conventional release liner) to weakly adhesive (interliner with controlled adhesive strength ≤5 N/cm). This parameter change allows the interliner to provide sufficient guidance stability during processing while still being removable before final application, resolving the contradiction between ease of operation and reliability.
2Reliability
If the interliner has high adhesion to the heat-activated layer, then guidance stability is improved, but the interliner cannot be easily removed before application
Solution Approach 1:
The patent precisely controls the adhesive strength parameter of the interliner to be maximum 5 N/cm according to EN 1939:2003. This optimized parameter provides sufficient guidance stability during processing while ensuring the interliner can be easily removed before application, resolving the contradiction between reliability and ease of operation.
3Object-affected harmful factors
If the interliner extends beyond the tape edges to prevent blocking, then edge sticking is prevented, but the interliner separation issue is worsened during processing
Solution Approach 1:
The patent changes the adhesive parameter of the interliner from non-adhesive to weakly adhesive (≤5 N/cm), which resolves the interliner separation issue while maintaining the edge extension configuration for blocking prevention. The weak adhesion ensures the interliner stays attached during processing even when extending beyond edges, resolving the contradiction between blocking prevention and interliner stability.
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 system provides stable winding and storage of adhesive tapes by preventing interliner separation and edge sticking, maintaining tape integrity and reducing surface damage, while allowing easy removal of the interliner before application.
Implementation Method 1
the adhesive tape (B) to the heat-activated adhesive layer of the adhesive tape (A) has an adhesive strength of a maximum of 5 N/cm
Data Source
AI summary
A double-sided adhesive tape, which has a pressure-sensitive adhesive side provided with a standard release liner and a heat-activated adhesive layer, is to be protected with a so-called interliner on the heat-activated side in order to enable stable guidance over cutting and winding machines as well as stable storage and transport of these adhesive tapes.This is achieved with a product structure in the form of a composite system comprising: - an adhesive tape (A) containing - a pressure-sensitive adhesive layer and - a heat-activated adhesive layer; - a release liner resting on the pressure-sensitive adhesive layer of the adhesive tape (A); and - an adhesive tape (B) comprising - a carrier layer, - a release layer on one side of the carrier layer, and - a pressure-sensitive adhesive layer on the side of the carrier layer opposite the release layer; wherein the pressure-sensitive adhesive layer of the adhesive tape (B) is in direct contact with the heat-activated adhesive layer of the adhesive tape (A), and the adhesive tape (B) exhibits a maximum adhesive strength of 5 N/cm, determined according to EN 1939:2003, to the heat-activated adhesive layer of the adhesive tape (A). The application also covers a method for producing such a composite system and the specific use of the adhesive tape (B).