Recyclable Carpet Manufacturing Using PET-CoPET Bicomponent Backing
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Solution Overview
Problem
Conventional carpet manufacturing methods result in non-recyclable products, often ending up in landfills, due to insufficient binding of tufted yarns, which affects production and usage.
Innovation Solution
A method involving a primary backing with a high PET content and a glue layer with a high coPET content, using bicomponent filaments to enhance tuft holding and structural integrity, allowing for easier recycling by ensuring strong adhesion without compromising the fabric's strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional carpet configuration with latex coating and secondary backing is used, then dimensional stability and adhesion are improved, but recyclability deteriorates
Solution Approach 1:
The invention removes the secondary backing and heavily filled latex coating from the carpet structure, extracting the problematic components that prevent recyclability while maintaining the essential tufting function through a simplified primary backing and glue layer configuration
Solution Approach 2:
The invention changes the material composition parameters by using a primary backing with high PET content (at least 60 wt%) and a glue layer with high coPET content (at least 60 wt%), creating a material system that is both structurally sound and recyclable
2Strength
If a primary backing with high PET content and glue layer with high coPET content is used, then tenacity and tuft holding are improved, but glue layer weight may be reduced
Solution Approach 1:
The invention optimizes the chemical composition parameters of the glue layer by specifying at least 60 wt% coPET content, which provides superior bonding characteristics that allow for reduced glue layer weight while maintaining or improving tenacity
Solution Approach 2:
The invention creates a composite material system combining PET-based primary backing with coPET-based glue layer, where the specific polymer composition provides enhanced mechanical properties and bonding strength that reduce the need for heavy glue applications
3Manufacturing precision
If bicomponent filaments are used in the primary backing, then uniformity and tuft holding capacity are improved, but manufacturing complexity increases
Solution Approach 1:
The invention specifies parameter ranges for the bicomponent filaments including PET content (at least 60 wt%) and filament denier (at least 6 dpf), which standardize the manufacturing process and ensure uniform performance while managing complexity through defined specifications
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 method produces carpets with improved tenacity and tuft holding capacity, facilitating recycling and maintaining the strength and loft of the fabric, while allowing for a lower weight glue layer, thus addressing the recyclability and durability issues of conventional carpets.
Implementation Method 1
The coPET that melts at a lower temperature acts as a binder while the PET yields and preferably maintains the structural integrity of the primary backing
Implementation Method 2
The adhesive layer may be a layer consisting for more than 50% out of coPET... the step of activating said glue layer at least for partially fixing said yarn on said primary backing
Data Source
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AI summary
Method for manufacturing a carpet or a rug, comprising the following steps: - the step (S1-S2) of providing a primary backing (1), being a woven or nonwoven layer comprising filaments of polyethylene terephthalate and copolymer of polyethylene terephthalate, the coPET having a lower melting temperature than the PET and wherein said PET is available in said primary backing (1) in a higher amount than said coPET; - the step of providing a glue layer (11) consisting for 50% or more out of coPET; - the step of tufting yarn at least into said primary backing (1); - the step of activating said glue layer (11) at least for partially fixing said yarn (15) on said primary backing (1).