Carpet Primary Backing Composition for Recyclable Tufted Yarn Fixation
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Solution Overview
Problem
Current carpet manufacturing methods using tufting operations result in products that are difficult to recycle, often ending up in landfills due to insufficient binding of yarn to the primary backing, leading to issues in production and usage.
Innovation Solution
A method involving a primary backing layer of PET filaments with a higher amount of PET and a glue layer comprising a copolymer (coPET) with a lower melting temperature, which acts as a binder to securely fix the yarn, enhancing the carpet's recyclability and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tufting method with latex coating is used to adhere yarn to backing, then the yarn is permanently fixed to the backing, but the carpet becomes difficult to recycle and ends up in landfills
Solution Approach 1:
The invention changes the chemical composition parameters of the backing material by incorporating a specific amount of binder polymer (5-20% of total polymer content) with different properties than the primary yarn polymer. This parameter change allows the yarn to be securely held during use while enabling separation during recycling processes, thus resolving the contradiction between adhesion reliability and recyclability.
Solution Approach 2:
The invention creates a composite backing material consisting of primary polymer fibers intertwined with binder polymer. This composite structure provides both the mechanical strength needed for yarn adhesion during use and the chemical separability needed for recycling. The binder polymer acts as a bonding agent that holds yarn tufts during manufacturing and use but can be separated during recycling processes.
2Stability of the object's composition
If heavily filled latex is applied to provide weight to the carpet, then dimensional stability is improved, but the carpet complexity and difficulty to recycle increases
Solution Approach 1:
The invention extracts and eliminates the heavily filled latex coating from the carpet structure. Instead, dimensional stability is achieved through the engineered backing material composition and the binder polymer system, which provides stability without the need for additional heavy filler materials, thus reducing structural complexity and improving recyclability.
Solution Approach 2:
The binder polymer performs multiple functions: it bonds yarn tufts to the backing during manufacturing, provides dimensional stability to the carpet, and enables recycling by being separable from the primary polymer. This multi-functionality replaces the need for separate latex coating and filler materials, reducing overall system complexity.
3Reliability
If the glue layer uses coPET with lower melting temperature to act as binder, then yarn fixation is improved, but the risk of compromising fabric strength increases
Solution Approach 1:
The invention applies local quality by using coPET binder polymer specifically in the regions where yarn bonding is needed (at the interface between yarn and backing), while the bulk of the backing material retains the original PET polymer for overall structural strength. This localized use of lower-melting-point material achieves yarn fixation without compromising the fabric's overall strength.
Solution Approach 2:
The invention carefully controls the parameters of the binder polymer content (5-20% of total polymer content) and its molecular weight to ensure it provides sufficient bonding through lower melting point while maintaining adequate fabric strength. The specific parameter range optimizes the balance between yarn fixation and fabric integrity.
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 a carpet with improved tenacity and initial tuft holding capacity, allowing for easier recycling and maintaining strength while ensuring sufficient adhesive for yarn fixation without compromising the fabric's strength.
Implementation Method 1
said glue layer is a layer comprising copolymer of polyethylene terephthalate (coPET) wherein the coPET has a lower melting temperature than the PET
Data Source
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 non-woven layer comprising filaments (2) of polyethyleneterephthalate and copolymer of polyethyleneterephthalate, 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 (12) on said primary backing (1). The invention also concerns carpets (16) and rugs that are obtained or obtainable by means of such method.