AKD-Laminated Adhesive Tape for Self-Adhesion and Easy Unwinding
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Solution Overview
Problem
Existing pressure-sensitive adhesive tapes struggle to balance self-adhesion and quick release characteristics without the need for a separate release coating, particularly in applications where the tape is overlapped, such as medical and surgical uses.
Innovation Solution
A laminated adhesive tape construction using a substrate with multiple plies bound by a polymeric laminating composition containing alkyl ketene dimer (AKD), eliminating the need for a separate release coating by incorporating AKD into the laminating polymer, which provides both self-adhesion and easy unwind properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a release coating is added to the tape construction, then the tape can achieve good self-adhesion and quick release characteristics, but the device complexity and manufacturing cost increase due to the additional layer
Solution Approach 1:
The release coating and laminating composition are merged into a single polymeric composition containing AKD that performs both functions: releasing the adhesive during storage/unwinding and bonding the substrate plies together. This eliminates the need for separate release and laminating layers.
Solution Approach 2:
The polymeric laminating composition containing AKD serves multiple functions simultaneously: it acts as a release agent for easy unwinding, provides laminating/bonding between substrate plies, and maintains self-adhesion properties. This multi-functional composition replaces what would traditionally require separate layers.
2Ease of operation
If a separate release coating is applied to the substrate, then the tape achieves easy unwind characteristics, but the manufacturing process and device complexity increase
Solution Approach 1:
The release coating application and laminating processes are merged into a single coating operation where the polymeric composition containing AKD is applied to the substrate and simultaneously serves as both release coating and laminating adhesive, simplifying the manufacturing process.
Solution Approach 2:
The AKD in the polymeric composition automatically provides release properties during storage and unwinding without requiring additional processing steps, while also serving as the laminating adhesive during manufacturing.
3Reliability
If multiple separate layers (substrate, release coating, laminating composition) are used, then each function can be optimized independently, but the tape construction becomes more complex and requires more materials
Solution Approach 1:
The release coating and laminating composition are combined into one polymeric layer containing AKD, reducing the total number of layers from three (substrate, release coating, laminating composition) to two (substrate, combined coating), and reducing the quantity of materials required.
Solution Approach 2:
The single polymeric composition performs multiple functions that would traditionally require separate layers: release properties for easy unwinding and laminating properties for bonding substrate plies, thereby reducing material quantity while maintaining functional performance.
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 tape achieves a good balance between self-adhesion and quick release characteristics, ensuring easy unwinding from the roll while maintaining effective adhesion, without the need for a separate release coating, and also offers hydrophobicity and water resistance.
Implementation Method 1
A polymeric laminating composition comprising a polymer and an alkyl ketene dimer binds the two or more plies
Implementation Method 2
The tape achieves a good balance between self-adhesion and quick release characteristics, ensuring easy unwinding from the roll while maintaining effective adhesion, without the need for a separate release coating, and also offers hydrophobicity and water resistance
Data Source
AI summary
A laminated adhesive tape includes a substrate comprising two or more plies of thin, flexible material, the substrate having a first major surface and a second major surface opposite the first major surface. A polymeric laminating composition comprising a polymer and an alkyl ketene dimer binds the two or more plies and a pressure sensitive adhesive carried on the first major surface. In a further aspect, a method of making a laminated adhesive tape is provided.