Hot-Melt Carpet Backing Lamination for Deep Adhesive Penetration
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Solution Overview
Problem
Conventional methods for binding greige carpet with secondary backing materials using hot melt adhesives face challenges in achieving adequate penetration while minimizing shrinkage and deterioration, often requiring high pressures or temperatures that can damage the carpet, and struggle to meet fire retardancy standards.
Innovation Solution
A method involving a heated application roll where hot melt adhesive is applied to the secondary backing material, allowing it to be contacted with the roll before pressing the greige carpet against it, combined with a chill roll to solidify the adhesive, achieving deep penetration and high adhesion without pressure-induced damage, and incorporating fire retardants to meet Class 1 fire ratings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high pressure is applied to force adhesive penetration into fiber tufts, then adhesive penetration and binding strength are improved, but fiber tuft distortion and carpet flattening occur
Solution Approach 1:
The patent replaces the mechanical pressure system with a thermal system. Instead of using high pressure to force adhesive penetration, the invention uses heated rollers to apply heat and melt the adhesive, allowing it to penetrate fiber tufts naturally through capillary action. The adhesive is applied in molten state at controlled temperatures, eliminating the need for high-pressure nipping that causes fiber distortion.
Solution Approach 2:
The patent changes the physical state parameters of the adhesive by controlling temperature. The adhesive is heated to its melting point to become molten and flowable, then applied to the carpet backing. After application, the temperature is reduced to allow the adhesive to solidify and bind. This temperature parameter control enables penetration without mechanical pressure.
2Manufacturing precision
If high temperature is used to achieve adequate adhesive viscosity for penetration, then adhesive flow and penetration are improved, but carpet shrinkage and material damage occur
Solution Approach 1:
The patent applies heat locally and selectively to the adhesive layer rather than heating the entire carpet assembly to high temperatures. The heated rollers transfer heat only to the adhesive as it is being applied, maintaining the adhesive in a molten state for penetration while the rest of the carpet remains at lower temperatures, preventing shrinkage and fiber damage.
Solution Approach 2:
The adhesive is pre-heated to its melting point before application to the carpet backing. This preliminary heating ensures the adhesive is in the correct viscous state for penetration when it contacts the fiber tufts, eliminating the need to heat the carpet itself during the binding process, thereby avoiding thermal damage to the carpet materials.
3Manufacturing precision
If low viscosity adhesive is used at low temperature for penetration, then fiber tuft penetration is improved, but mechanical strength and dimensional stability are insufficient
Solution Approach 1:
The patent utilizes the phase transition of the adhesive from solid to liquid and back to solid. The adhesive is heated above its melting point to become a low-viscosity liquid that easily penetrates fiber tufts. After application and penetration, the adhesive cools and solidifies, transforming into a high-strength binding material that provides dimensional stability and mechanical strength to the carpet backing.
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
This process enables a single-pass binding with excellent adhesive penetration, increased mechanical strength, reduced shrinkage, and improved fire retardancy, resulting in a high-quality finished carpet with enhanced durability and safety features.
Implementation Method 1
A method is provided for binding a greige carpet with a secondary backing material using a hot melt adhesive. The hot melt adhesive is applied to the secondary backing material and contacted with a heated application roll.
Implementation Method 2
The adhesive loaded secondary backing material is contacted with the heated application roll to form a secondary backing material on the heated application roll.
Implementation Method 3
The greige carpet is pressed against the secondary backing material on the heated application roll to form a finished carpet. A chill roll may be contacted with the finished carpet to cool and solidify the hot melt adhesive.
Data Source
AI summary
A method for binding a greige carpet and a secondary backing material using a hot melt adhesive is disclosed. A heated application roll may be provided and the secondary backing material may be contacted with the hot melt adhesive and greige carpet and pressed against the heated application roll.