Thermally fusible sheet body
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Solution Overview
Problem
Current adhesive systems for interlining materials in the textile industry face challenges such as contamination during application, inhomogeneous bonding, and limited resistance to chemical cleaning and garment dyeing processes, especially with light and open carrier layers.
Innovation Solution
A thermally fixable fabric with a carrier layer coated using a polyurethane mixture comprising polyesterurethane, polyetherurethane, and polycarbonate urethane, crosslinked with a blocked isocyanate, which provides excellent post-processing properties, low riveting back, and resistance to chemical cleaning and high-temperature drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional adhesive systems are used on light and open carrier layers, then application is simpler, but contamination during application occurs and bonding becomes inhomogeneous
Solution Approach 1:
The patent changes the physical and chemical parameters of the adhesive system by using a polyurethane mixture with specific viscosity characteristics and blocked isocyanate crosslinking agents. This allows the adhesive to maintain stability during application on light carrier layers while achieving homogeneous bonding through controlled crosslinking at elevated temperatures, resolving the contradiction between application simplicity and bonding homogeneity.
Solution Approach 2:
The patent employs a composite adhesive system consisting of multiple polyurethane components (polyesterurethane, polyetherurethane, and polycarbonate urethane) combined with blocked isocyanate crosslinkers. This composite formulation provides both the ease of application required for light carrier layers and the homogeneous bonding performance needed, as each component contributes specific properties to the overall adhesive system.
2Ease of manufacture
If conventional adhesive systems are used, then processing is easier, but resistance to chemical cleaning and garment dyeing is limited
Solution Approach 1:
The patent fundamentally changes the chemical parameters of the adhesive system by implementing a crosslinking mechanism using blocked isocyanates. This creates a three-dimensional network structure that significantly enhances resistance to chemical cleaning and garment dyeing processes while maintaining processing ease through controlled crosslinking at standard finishing temperatures, thus resolving the contradiction between processing ease and chemical resistance.
Solution Approach 2:
The patent replaces conventional physical bonding mechanisms with chemical crosslinking bonds. The blocked isocyanate groups form covalent bonds with the polyurethane chains, creating a chemically crosslinked network that provides superior resistance to chemical cleaning and garment dyeing compared to conventional thermoplastic adhesives that rely on physical entanglement and melting.
3Strength
If crosslinking is achieved with unblocked isocyanate, then bonding strength increases, but application becomes difficult due to premature reaction
Solution Approach 1:
The patent applies preliminary action by using blocked isocyanates that prevent premature crosslinking during adhesive application and bonding operations. The blocking agents temporarily mask the isocyanate groups, allowing the adhesive to be applied and positioned without premature reaction. Subsequently, during a curing or finishing step at elevated temperatures, the blocking agents are removed or decomposed, enabling the isocyanates to crosslink and achieve high bonding strength, thus resolving the contradiction between bonding strength and application ease.
Solution Approach 2:
The patent introduces blocking agents as intermediaries that temporarily deactivate the isocyanate groups during application. These blocking agents (such as water, alcohols, or amines) form reversible adducts with the isocyanates, preventing premature crosslinking. During subsequent heating or curing, the blocking agents are eliminated or decomposed, releasing the isocyanates to form the final crosslinked network with high bonding strength, thereby mediating between application requirements and final bonding performance.
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 achieves excellent wash resistance, elasticity, and tactile performance, allowing for the production of soft, elastic, and durable interlining materials suitable for garment dyeing and other demanding textile applications without compromising the quality of production systems.
Implementation Method 1
crosslinked with a blocked isocyanate
Implementation Method 2
thermally fixable fabric
Implementation Method 3
resistance to chemical cleaning and high-temperature drying
Implementation Method 4
The fiber web usually consists of polyester or polyamide fibers specially developed for this process
Data Source
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AI summary
The invention relates to a thermally fusible sheet body usable in particular as a fusible interlining in the textile industry which comprises a support layer made of a textile material on top of which has been applied an adhesive composition structure comprising a polyurethane coating containing a polyurethane mixture comprising at least one polyester urethane (B1), at least one polyether urethane (B2) and at least one polycarbonate urethane (B3) and wherein the polyurethane mixture has been at least partially crosslinked with a crosslinker comprising at least one isocyanate blocked with a blocking agent at at least one isocyanate group.