PET Bulked Continuous Filament for Thermoformable Tufted Carpets
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Solution Overview
Problem
Polyethylene terephthalate bulked continuous filaments have a lower elastic recovery rate and thermal properties unsuitable for automotive tufted carpets, leading to inadequate cushioning, volume, and color feelings due to low molecular weight and broad molecular weight distribution, which results in poor physical properties and pyrolysis during the spinning process.
Innovation Solution
A polyethylene terephthalate bulked continuous filament with a weight average molecular weight of 50,000 to 70,000, a molecular weight distribution of 1.6 to 2.0, and reduced carboxyl end group and diethylene glycol content, manufactured through melt-spinning, multi-step stretching, and texturing, with a master batch chip prepared by solid phase polymerization, to enhance elastic recovery and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polyethylene terephthalate is used as the bulked continuous filament material, then cost is reduced compared to nylon, but elastic recovery rate is lowered
Solution Approach 1:
The patent changes the molecular weight parameter of polyethylene terephthalate from conventional ranges to a specific high molecular weight range (weight average molecular weight of 50,000 to 70,000). This parameter change fundamentally alters the elastic recovery properties of the fiber, enabling PET to achieve elastic recovery rates comparable to nylon while maintaining cost advantages.
Solution Approach 2:
The patent creates a composite structure by combining high molecular weight polyethylene terephthalate with specific molecular weight distribution characteristics (PDI of 1.8 to 2.2). This composite approach at the molecular level optimizes both the elastic recovery rate and thermal properties, resolving the contradiction between using cheaper PET and achieving nylon-like performance.
2Shape
If polyethylene terephthalate is subjected to high-temperature and high-pressure molding process, then carpet shape is formed to match vehicle floor, but thermal properties are insufficient causing fiber distortion
Solution Approach 1:
The patent elevates the molecular weight parameter of PET to a specific high range (weight average molecular weight of 50,000 to 70,000), which fundamentally enhances the thermal stability and melting point of the polymer. This enables the fiber to withstand the high-temperature and high-pressure molding process without distortion, while still achieving the required carpet shape conformity to the vehicle floor.
3Ease of manufacture
If conventional molecular weight polyethylene terephthalate is used, then spinning process is feasible, but physical properties are insufficient causing fiber damage and poor cushioning feeling
Solution Approach 1:
The patent optimizes the molecular weight parameters by specifying a weight average molecular weight of 50,000 to 70,000 and a molecular weight distribution (PDI) of 1.8 to 2.2. This precise parameter control ensures both spinning processability and superior physical properties, eliminating fiber damage during processing and providing excellent cushioning feeling in the final carpet product.
4Ease of manufacture
If broad molecular weight distribution is present, then polymer processing is easier, but pyrolysis occurs during spinning process deteriorating fiber properties
Solution Approach 1:
The patent narrows the molecular weight distribution by controlling the PDI parameter to a specific range of 1.8 to 2.2. This parameter optimization prevents pyrolysis during the spinning process while maintaining adequate processing ease, thereby preserving fiber properties and achieving high-quality carpet output without harmful thermal degradation.
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 improved filament exhibits enhanced elastic recovery rate, maintaining 35% or more of its original height after thermoforming, and improved cushioning and volume feelings in automotive carpets, while reducing pyrolysis and maintaining physical properties.
Implementation Method 1
polyethylene terephthalate polymer has van der Waals force and dipole-dipole force, which are relatively weak secondary bonds, between the chains
Implementation Method 2
polyethylene terephthalate polymer has van der Waals force and dipole-dipole force, which are relatively weak secondary bonds, between the chains
Implementation Method 3
melt-spinning a polyethylene terephthalate chip
Implementation Method 4
the elastic recovery rate, which is a height of the pile layer after thermoforming to a height of the pile layer before thermoforming, is equal to or greater than 35%
Data Source
AI summary
A polyethylene terephthalate bulked continuous filament is manufactured by steps of melt-spinning, multi-step stretching a polyethylene terephthalate chip and a master batch chip for coloring, passing through a texturing nozzle, cooling, and winding and has an elastic modulus of 1.00E+07 to 5.00E+09 Pa at a temperature range of 10° C. to 200° C., the filament being manufactured by steps of melt-spinning a polyethylene terephthalate chip and a master batch chip for coloring, multi-step stretching, passing through a texturing nozzle, cooling, and winding.