Threadlike Adhesive Body with Storage Modulus Control for Width Uniformity
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Solution Overview
Problem
Threadlike adhesive bodies exhibit uneven thickness and variation in thread width when wound and unwound due to adhesive stretching during unwinding, which has not been adequately addressed in existing technologies.
Innovation Solution
The adhesive bodies are formulated with a core material and an adhesive that has a storage elastic modulus exceeding specific thresholds (8.53 × 10^4 Pa at 0°C and 3.04 × 10^4 Pa at 23°C) and contain acrylic polymers with specific monomer compositions, ensuring minimal variation in thread width upon unwinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the threadlike adhesive body is wound into a cylindrical shape using a bobbin, then storage and transportation become easier, but the adhesive stretches and cuts when unwound, causing uneven thickness and variation in thread width
Solution Approach 1:
The patent changes the physical parameter of the adhesive by controlling its gel fraction within a specific range (5-20%) before winding. This parameter control prevents excessive deformation during winding and unwinding operations, maintaining thread width uniformity while enabling easy storage and transportation in wound form.
Solution Approach 2:
The patent applies preliminary treatment to the adhesive by controlling its gel fraction and viscoelastic properties before the winding operation. This beforehand preparation creates a cushioning effect that absorbs the mechanical stress during winding and unwinding, preventing adhesive stretching and cutting that would otherwise occur during the unwinding process.
2Adaptability or versatility
If the adhesive has high flexibility for conforming to complex shapes, then adaptability improves, but the adhesive stretches excessively when wound and unwound, causing thickness variation
Solution Approach 1:
The patent optimizes the gel fraction parameter to a balanced range (5-20%) that provides sufficient flexibility for conforming to complex shapes while maintaining enough structural integrity to prevent excessive stretching during winding and unwinding operations, thus maintaining thickness uniformity.
Solution Approach 2:
The patent creates a composite structure within the adhesive by controlling the gel fraction, combining the flexible matrix with gel network structures. This composite approach provides both the adaptability needed for complex shape conformance and the mechanical stability required to prevent thickness variation during wound body formation and unwinding.
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 provides a threadlike adhesive body with consistent thread width and excellent strength, preventing adhesive stretching and cutting during unwinding, thereby maintaining uniform thickness and adhesive integrity.
Implementation Method 1
the adhesive has a storage elastic modulus exceeding 8.53 × 10^4
Data Source
AI summary
According to the present invention, it is possible to provide a threadlike adhesive body that has small variation in thread width when made into a wound body and then unwound. The present invention relates to a threadlike adhesive body containing a core material and an adhesive that covers a surface of the core material in a longitudinal direction, and the adhesive has a storage elastic modulus exceeding 8.53 × 104 Pa at 0°C.