Adhesive Sheet for Wire Harnesses with Primer Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing adhesive sheets for bundling and protecting wire harnesses face issues such as long crimping times with heat fusion, adhesive stickiness to hands and wires, insufficient adhesive force, and variations in adhesive properties due to plasticizer seepage, which affect working properties and reliability.
Innovation Solution
A vinyl halide-based resin substrate with a polyester-based plasticizer and elastomer adhesive layers, featuring a primer layer for improved adhesion and reduced stickiness, ensuring strong bonding at normal temperatures and enhanced working properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat fusion method is used to bond adhesive layers, then bonding strength is improved, but crimping time increases and risk of wire damage increases
Solution Approach 1:
The patent changes the bonding mechanism from thermal (heat fusion) to mechanical/chemical (pressure-sensitive adhesive bonding). The adhesive layers are designed to bond at normal temperatures through pressure-sensitive adhesion, eliminating the need for heat fusion machines and reducing crimping time while maintaining bonding strength.
Solution Approach 2:
The patent replaces the thermal processing system (heat fusion machine) with a mechanical bonding system (pressure-sensitive adhesive). This substitution eliminates the complexity of thermal control and reduces equipment requirements, thereby reducing crimping time and operational risk.
2Ease of operation
If pressure-sensitive adhesive is used for bonding at normal temperatures, then working properties are improved, but adhesive stickiness to hands and wires occurs
Solution Approach 1:
The patent applies local quality by providing adhesive layers only on the surfaces that need bonding, while the central portion of the adhesive sheet remains non-adhesive or has reduced adhesion. This allows workers to handle the sheet without excessive stickiness to hands, while still achieving strong bonding at the intended locations.
Solution Approach 2:
The adhesive sheet is segmented into adhesive regions and non-adhesive regions. The adhesive layers are positioned only where bonding is required, separating the adhesive function from the handling areas, thus improving working properties without excessive stickiness.
3Shape
If polyvinyl chloride substrate with plasticizer is used, then softness and stretchability are improved, but adhesive properties vary due to plasticizer seepage
Solution Approach 1:
The patent introduces a barrier layer or primer layer between the polyvinyl chloride substrate and the adhesive layers. This intermediary prevents plasticizer seepage from the substrate to the adhesive, maintaining consistent adhesive properties while allowing the substrate to retain its softness and stretchability.
Solution Approach 2:
The patent creates a composite structure combining the polyvinyl chloride substrate with a barrier layer or primer layer that is resistant to plasticizer penetration. This composite material structure maintains the mechanical properties of the PVC substrate while preventing chemical migration that would affect adhesive consistency.
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 reliable adhesive sheet with strong bonding capabilities, reduced stickiness, and improved working properties, ensuring effective bundling and protection of wire harnesses without the drawbacks of existing methods.
Implementation Method 1
sheets having a dual-surface adhesive tape on one surface of a substrate are known... adhesive layers that are bonded with a sheet substrate
Data Source
AI summary
[Problem] To provide: an adhesive sheet capable of bonding adhesive layers together at normal temperatures, with little stickiness of the adhesive layers due to a plasticizer seeping out from a substrate; a protective material using the adhesive sheet; and a wire harness. [Solution] An adhesive sheet comprising: a substrate containing 20-100 parts by mass of a polyester-based plasticizer (B) with respect to 100 parts by mass of a vinyl halide-based resin (A); a primer layer; and adhesive layers in which an included amount of a tackifier (D) is 0-250 parts by mass and an included amount of inorganic microparticles (E) is 0-250 parts by mass with respect to 100 parts by mass of an elastomer (C), and a total value of the included amounts of the tackifier (D) and the inorganic microparticles (E) is 0-350 parts by mass; wherein the adhesive layers have a probe tack of 7 N/cm2 or less in accordance with ASTM D 2979, and the adhesive force between the adhesive layers having a width of 15 mm is 1.5 N or more.