Bonded Recycled Carpet Insulation Batt With Controlled Fiber Melting
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Solution Overview
Problem
Existing insulation materials derived from recycled carpets lack the ability to form a bonded, thermally and acoustically effective insulation batt with controlled thermal attenuation properties suitable for buildings and automobiles, as they either fail to maintain integrity or do not incorporate fire-resistant components effectively.
Innovation Solution
A bonded insulation batt is created by harvesting carpet fibers from used carpets, mixing them with fire-resistant cotton shoddy and bi-component polyester core fibers coated with a low melting sheath polymer, and heat-treating the mixture to form a rigid, thermally insulating product with Class A fire rating, using ammonium sulfate as a fire retardant chemical.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If recycled carpet fibers are used to form insulation batts, then environmental sustainability is improved, but the ability to form a bonded structure with controlled thermal attenuation is insufficient
Solution Approach 1:
A bi-component polyester fiber with a low-melting-point sheath acts as an intermediary bonding agent. The sheath component (melting point 240-280°F) melts during heat treatment to bond the recycled carpet fibers together, while the high-melting-point core component (melting point 450-500°F) maintains structural integrity. This intermediary fiber resolves the contradiction by enabling bonded structure formation without compromising the use of recycled materials.
2Strength
If heat treatment is applied to bond fibers, then structural integrity is improved, but fire resistance deteriorates due to polymer melting
Solution Approach 1:
The bonding process uses controlled heat treatment at temperatures between 240-280°F, which is carefully selected to be above the melting point of the sheath polymer (enabling bonding) but well below the melting point of the core polymer and typical fire ignition temperatures (maintaining fire resistance). This parameter control resolves the contradiction between achieving structural integrity through bonding and maintaining fire resistance.
Solution Approach 2:
The bi-component fiber structure creates local quality differentiation: the sheath component is designed with low melting point for localized bonding action, while the core component maintains high melting point for structural stability and fire resistance. This local differentiation allows the material to exhibit both bonding capability and fire resistance in different regions of the same fiber.
3Strength
If fiber bonding is achieved through heat treatment, then insulation rigidity is improved, but air pocket closure occurs reducing insulation effectiveness
Solution Approach 1:
The heat treatment temperature is precisely controlled to melt only the sheath polymer (240-280°F) while leaving the core polymer and air pockets intact. This parameter control enables the formation of rigid bonded structure through sheath melting without causing excessive fiber fusion that would close air pockets and reduce insulation effectiveness.
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 produces a rigid, cuttable insulation batt with enhanced thermal resistance and acoustic insulation capabilities, achieving Class A fire rating and maintaining insulation integrity by preventing melt flow and air pocket closure, suitable for building and automotive applications.
Implementation Method 1
The sheath of the bonding bi-component staple fiber melts during heating of fiber assembly creating local bonding between adjacent fibers
Implementation Method 2
The fire retardant chemical used is ammonium sulfate, which decomposes at 482° F. or 250° C. producing decomposition into ammonia, nitrogen, sulfur dioxide, and water. The flame propagation is deprived of oxygen and is therefore prevented.
Implementation Method 3
The rigid fibrous insulation batt can be cut to various sizes according to user needs... achieving Class A fire rating and maintaining insulation integrity by preventing melt flow and air pocket closure, suitable for building and automotive applications.
Data Source
AI summary
A thermal insulation batt is created from recycled carpet fibers and fire resistant cotton shoddy bonded by staples of bi-component fiber having a polyester core and low melting polymeric sheath. The low melting polymeric sheath melts at a temperature well below the melting or degradation temperature of any of the carpet fibers from the recycled carpets. Since the sheath has a small thickness, the amount of melt created is small and bonding occurs only between the bi-component staple fiber and adjacent carpet fiber or fire resistant cotton shoddy without melt overflow. The rigidized thermal insulation batt can be used in a building between studs and may be used in an automobile door for sound proofing. This product is particularly well suited for use as acoustic and thermal insulation in buildings as “non-load bearing” partitions in interior offices of commercial buildings. This bonded low density composite fibrous structure has fire retarding constituents incorporated within the batt to retard propagation of building fire. These stated uses are non-limiting; and other uses are contemplated, including automobile interior structures.