UV curable adhesive tape and method for covering elongated products in particular cables
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Solution Overview
Problem
Current adhesive tapes used for wrapping cable harnesses require high curing temperatures, which can damage PVC insulation and result in high manufacturing costs, and lack the necessary dimensional stability for integration into the manufacturing process of cable harnesses.
Innovation Solution
A UV-curable adhesive tape with a band-shaped carrier coated with a pressure-sensitive adhesive composition comprising 15-50 parts by weight matrix polymer, 50-85 parts by weight epoxy resin, and 0.1-3 parts by weight photoinitiator, allowing for curing at room temperature or below 110°C, providing the required dimensional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high curing temperature (175°C) is used to cure the adhesive compound, then the adhesive achieves sufficient strength and dimensional stability, but the PVC insulation of the cables is damaged
Solution Approach 1:
The patent changes the curing temperature parameter from conventional high temperature (175°C) to low temperature (110°C or below) by modifying the adhesive chemistry. This is achieved by selecting specific resin systems and photoinitiators that enable effective curing at reduced temperatures, thereby protecting the PVC insulation while still achieving sufficient adhesive strength and dimensional stability
Solution Approach 2:
The patent replaces thermal curing (heat-based) with UV光固化 (light-based) curing mechanism. By using photoinitiators that activate under UV radiation, the adhesive cures at low temperatures without requiring high heat, thus avoiding damage to the cable insulation while achieving the necessary mechanical properties
2Shape
If injection-molded parts are added to maintain cable harness shape, then the cables can be routed without contact, but additional material and assembly costs are incurred
Solution Approach 1:
The adhesive tape is designed to perform multiple functions simultaneously: it provides mechanical bundling of cables, maintains the cable harness shape through dimensional stability after curing, and enables proper routing without contact. This multi-functionality eliminates the need for separate injection-molded support parts, reducing both material and assembly costs
Solution Approach 2:
The patent merges the functions of mechanical support and adhesive bonding into a single component. The cured adhesive tape itself provides the structural rigidity and shape maintenance that would otherwise require separate injection-molded parts, consolidating multiple functions into one element and simplifying the manufacturing process
3Object-affected harmful factors
If the adhesive cures at room temperature or below 110°C, then the PVC insulation is protected, but the adhesive may lack sufficient dimensional stability
Solution Approach 1:
The patent uses a composite adhesive system combining specific resins (epoxy, polyester, polyurethane, or vinyl esters) with photoinitiators and optional fillers. This composite formulation enables the adhesive to cure at low temperatures while achieving sufficient crosslinking density and molecular structure to provide the required dimensional stability and mechanical strength
Solution Approach 2:
The patent modifies the chemical composition parameters of the adhesive to enable low-temperature curing with adequate performance. By selecting resins with appropriate glass transition temperatures and molecular weights, and using photoinitiators with suitable absorption characteristics, the adhesive achieves both low curing temperature and high dimensional stability after curing
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
Enables the integration of adhesive tapes into the manufacturing process of cable harnesses without damaging the insulation, reducing costs, and ensuring the adhesive cures within the manufacturing cycle time, while maintaining the necessary dimensional stability and flexibility.
Implementation Method 1
the self-adhesive pressure-sensitive adhesive is a UV-curable composition, comprising: 15 to 50 parts by weight matrix polymer; 50 to 85 parts by weight epoxy resin; 0.1 to 3 parts by weight photoinitiator
Implementation Method 2
the adhesive compound applied to the tape is cured by the application of radiant energy, such as heat... the self-adhesive pressure-sensitive adhesive is a UV-curable composition
Data Source
AI summary
The present invention relates to an adhesive tape and a method for wrapping elongated goods, in particular cable assemblies. The adhesive tape must cure within the specified processing time for further processing, e.g., within 6 minutes, and after curing must exhibit the required dimensional stability. On the other hand, the adhesive must not cure during storage, as it would otherwise become unusable. Furthermore, the curing temperatures must not be too high, as this could damage the cable insulation, which is often made of PVC.According to the invention, an adhesive tape for wrapping elongated goods is proposed, comprising a tape-shaped carrier provided on at least one side with an adhesive layer consisting of a self-adhesive pressure-sensitive adhesive, characterized in that the self-adhesive pressure-sensitive adhesive is a UV-curable composition comprising, based on the total weight of the composition: 15 to 50 parts by weight matrix polymer; 50 to 85 parts by weight epoxy resin; 0.1 to 3 parts by weight photoinitiator, wherein the matrix polymer forms a self-supporting film in which the epoxy resin and photoinitiator are embedded.The present invention also relates to a method for sheathing elongated goods such as, in particular, cables or cable sets, wherein an adhesive tape as described above is guided in a helical line around the elongated goods or the elongated goods are enveloped in the axial direction by the adhesive tape, the elongated goods together with the enveloping adhesive tape are brought into the desired arrangement, in particular into the cable set layout, the elongated goods are held in this arrangement, and the curable adhesive mass is cured by the supply of UV radiation energy.