Curable Adhesive Tape for Dimensionally Stable Cable Harness Jacketing
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Solution Overview
Problem
Existing adhesive tapes for cable looms cure at high temperatures, damaging cable insulation and requiring complex prefabrication, and lack the ability to maintain dimensional stability during manufacturing without additional material and assembly effort.
Innovation Solution
A thermally curable adhesive tape with a pressure-sensitive layer, using an epoxide-functionalized acrylonitrile/butadiene copolymer and a ground reaction product of phthalic anhydride and diethylenetriamine, cures at temperatures up to 110°C, allowing for flexible wrapping and subsequent curing to achieve rigid cable looms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high temperature curing (175°C) is used to achieve rapid adhesive curing, then curing speed is improved, but cable insulation is damaged
Solution Approach 1:
The patent changes the curing temperature parameter from conventional high temperatures (175°C) to a lower range (60-110°C). This is achieved by formulating a two-component adhesive system where Component A contains epoxy-functionalized acrylonitrile/butadiene copolymer and Component B contains ground reaction product of phthalic anhydride and diethylenetriamine, which together enable curing at reduced temperatures while maintaining adequate curing speed and avoiding damage to cable insulation.
2Adaptability or versatility
If adhesive tape is used to wrap cable harnesses, then flexibility is improved, but dimensional stability deteriorates
Solution Approach 1:
The adhesive tape exhibits dynamic properties: it remains flexible and adaptable during the wrapping process to conform to the cable harness geometry, then transitions to a rigid, dimensionally stable state after curing. The uncured adhesive allows the tape to be wrapped around complex cable arrangements, while the cured adhesive provides the necessary structural stability.
Solution Approach 2:
The adhesive undergoes a phase transition from a soft, tacky uncured state to a rigid cured state through chemical crosslinking. This phase change enables the tape to be easily applied in the uncured state and then locks into place with dimensional stability after curing at temperatures between 60-110°C.
3Stability of the object's composition
If injection-molded components are used to hold cable harnesses in defined shape, then dimensional stability is improved, but device complexity and assembly effort increase
Solution Approach 1:
The patent merges the functions of the adhesive tape and the injection-molded components into a single integrated solution. The adhesive tape itself provides both the wrapping function and the dimensional stability function that previously required separate components, thereby simplifying the overall device structure and reducing assembly complexity.
Solution Approach 2:
The adhesive tape performs multiple functions: it bundles the cable harnesses, provides mechanical protection, and maintains the defined three-dimensional shape of the cable loom. This multi-functionality replaces the need for separate injection-molded components that were previously required to provide structural support and shape maintenance.
4Object-affected harmful factors
If adhesive cures at low temperature (60-110°C) to protect cable insulation, then thermal damage is reduced, but curing time increases
Solution Approach 1:
The patent uses a composite adhesive system consisting of two components: Component A (epoxy-functionalized acrylonitrile/butadiene copolymer) and Component B (ground reaction product of phthalic anhydride and diethylenetriamine). This composite formulation enables curing at lower temperatures (60-110°C) while maintaining reasonable curing speeds, balancing thermal protection with manufacturing efficiency.
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 adhesive tape cures within manufacturing constraints, providing dimensional stability and reducing assembly complexity while maintaining adhesive properties, suitable for cable harnesses in automobiles.
Implementation Method 1
the curable adhesive is brought to cure by the supply of thermal energy more particularly at a temperature of up to 110° C.
Implementation Method 2
The adhesive layer comprises an epoxide-functionalized acrylonitrile/butadiene copolymer having on average more than 1.5 epoxide groups per molecule and the preferably ground reaction product of phthalic anhydride and diethylenetriamine
Implementation Method 3
a thermally curable, meltable, preferably pressure-sensitive adhesive layer
Data Source
AI summary
The invention relates to a method for jacketing elongate articles, such as lines or cable harnesses in particular, by means of an adhesive tape comprising a tape-shaped substrate, which substrate has, on at least one side, a thermally curable, meltable, preferably pressure-sensitive adhesive layer, the adhesive layer comprising an epoxide-functionalized acrylonitrile-butadiene copolymer which has on average more than 1.5 epoxide groups per molecule and comprising the reaction product of phthalic anhydride and diethylene-triamine, the adhesive tape being led in a helix around the elongate article or the elongate article being enveloped by the adhesive tape in the axial direction, the elongate article together with the enveloping adhesive tape being brought into the desired arrangement, in particular into the cable harness plan, the elongate article being held in this arrangement, and the curable adhesive mass being cured by supplying thermal energy, in particular at a temperature of up to 110° C.