Textile Cable Bandaging Tape for Heat-Stable Orange Color
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Solution Overview
Problem
Adhesive tapes used for cable harnesses in the automotive industry fail to maintain their orange color and functionality at elevated temperatures, particularly above 105°C, leading to potential safety issues as they do not meet the required temperature classes for long-term exposure, such as T3 and T4, due to color fading and potential damage to cable insulation.
Innovation Solution
An adhesive tape with a textile carrier colored using a mixture of anthraquinone-based dyes and pigments, combined with a pressure-sensitive adhesive, which provides high lightfastness and resistance to temperature-induced decolouring, allowing it to maintain its orange color and functionality even at 150°C for 3000 hours, thus meeting the stringent temperature classes T3 and T4.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional orange dyes are used for coloring adhesive tapes, then the tapes can be produced cost-effectively, but the tapes exhibit significant color fading when exposed to elevated temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the dyeing system by combining disperse dyes with pigments having specific chemical structures (chromium oxide green, ultramarine, carbon black, iron oxide red, and yellow iron oxide). This compositional parameter change enables the adhesive tape to achieve temperature stability up to 150°C while maintaining cost-effective production through conventional textile carrier materials and standard dyeing processes.
2Reliability
If spin dyeing is used to incorporate dye into the polymeric matrix, then color stability is improved, but production complexity and costs increase significantly
Solution Approach 1:
The patent extracts the color stability requirement from the fiber production stage (spin dyeing) and transfers it to the adhesive tape formulation stage by using pigment combinations that inherently resist thermal degradation. This allows conventional textile carriers to be used with standard dyeing processes while achieving the required color stability through the specific pigment composition in the adhesive layer.
Solution Approach 2:
The patent introduces pigments as intermediary substances that mediate between the textile carrier and the adhesive, providing thermal stability to the overall system. These pigments (chromium oxide green, ultramarine, carbon black, iron oxide red, yellow iron oxide) act as stable colorants that do not degrade at elevated temperatures, thereby protecting the overall color appearance without requiring modifications to the textile carrier production process.
3Reliability
If adhesive tapes are required to meet temperature class T4 standards, then safety and reliability are improved, but the range of available orange-colored tapes is limited
Solution Approach 1:
The patent creates a composite coloring system combining disperse dyes (for base coloration) with multiple inorganic and organic pigments (chromium oxide green, ultramarine, carbon black, iron oxide red, yellow iron oxide) that are specifically selected for their thermal stability. This composite material approach enables the production of orange-colored adhesive tapes that meet temperature class T4 standards (150°C) while maintaining versatility in formulation options.
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 achieves significant color stability and compatibility with cable insulation, exceeding the temperature stability of existing spundyed carriers, while allowing for cost-effective production of small batches without the need for spin dyeing, ensuring safety and compliance with industry standards.
Implementation Method 1
The textile carrier is coloured with a mixture of dyes and/or pigments, wherein at least one of the dyes and/or one of the pigments is based on anthraquinone
Implementation Method 2
having a pressure-sensitive adhesive coating applied at least to one side of the carrier
Data Source
AI summary
Adhesive tape consisting of a textile carrier and of an adhesive layer applied to at least one side of the carrier, the carrier being coloured with a mixture of dyes and/or pigments, characterized in that at least one of the dyes and/or one of the pigments is based on anthraquinone.