PET Coloring via Static Mixing for Tonal Carpet Filament
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Solution Overview
Problem
Traditional manufacturing processes for broadloom carpet struggle to produce small, customized runs of carpet with uniform tonal effects and are costly due to the expense of producing small amounts of BCF yarns in dedicated colors, and the difficulty in achieving uniform color distribution across strands.
Innovation Solution
A method using a multi-screw extruder to melt and purify PET, followed by a static mixing assembly with multiple static mixing elements and colorant ports along its length, allowing for the injection of colorants at various positions to create a tonal color effect in bulked continuous carpet filament.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional BCF production line is changed from one color to another, then color customization is achieved, but production downtime and waste increase due to shutting down the line and producing undesired color during transition
Solution Approach 1:
The production process is segmented into two independent stages: (1) continuous production of undyed BCF yarn on the main production line, and (2) separate coloring of the BCF yarn through a winding and dyeing machine. This segmentation allows the main production line to operate continuously without interruption for color changes, while only the coloring section needs to be adjusted for different colors, thereby eliminating waste associated with line shutdowns and color transitions.
Solution Approach 2:
The BCF yarn is produced in advance in a neutral or undyed state, and the coloring action is performed subsequently during the winding process. This preliminary production of the base material allows for flexible, on-demand coloring without requiring the entire production line to be reconfigured for each color, thus preventing waste of material produced during color transition periods.
2Adaptability or versatility
If traditional manufacturing processes are used for small customized runs, then color variety is achieved, but production cost increases due to dedicated color production requirements
Solution Approach 1:
The main BCF production line serves as a universal platform that can produce yarn in any quantity without being dedicated to specific colors. The coloring function is then applied universally to any BCF yarn produced, allowing small customized runs to be manufactured at the same cost efficiency as large production runs, since the expensive main production line doesn't need to be reconfigured for each color or quantity.
Solution Approach 2:
The coloring function is extracted from the main BCF production process and placed into a separate, dedicated winding and dyeing machine. This extraction allows the main production line to focus solely on efficient yarn production, while the separate coloring section handles color customization independently, thereby eliminating the cost penalty associated with color-specific production setups.
3Manufacturing precision
If colorant is added upstream in traditional processes, then color mixing occurs, but uniform tonal effect is difficult to achieve due to incomplete mixing and color variation across strands
Solution Approach 1:
Instead of attempting to achieve uniform color mixing through complex mechanical mixing in the traditional upstream addition method, the invention transitions to a different approach: colorant is added downstream during the winding process, and uniformity is achieved through the dimensional action of winding the yarn through the colorant bath multiple times. This multi-pass winding process ensures thorough and uniform color distribution without requiring complex mixing equipment.
4Adaptability or versatility
If multiple tones are incorporated in individual BCF strands, then tonal effect is achieved, but maintaining uniform proportions of tones over strand length becomes difficult
Solution Approach 1:
The coloring process operates continuously as the BCF yarn is wound through the colorant bath during normal production flow. This continuous coloring action, combined with the repeated winding passes, ensures that all portions of each yarn strand receive the same color treatment, maintaining uniform tone proportions throughout the entire length of the strand without requiring complex interruption and reconfiguration.
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
Enables the efficient and cost-effective production of customized, tonally-colored BCF for broadloom carpets with uniform color distribution, reducing waste and allowing for production from recycled materials.
Implementation Method 1
an extruder (e.g., a multi-screw extruder, such as an MRS machine) at least partially melts the PET into a polymer melt
Implementation Method 2
One or more colorant ports positioned along a length of the static mixing assembly provide colorant to the polymer stream at any of a plurality of different locations along the length of the static mixing assembly
Data Source
AI summary
Method and system for manufacturing bulked continuous filament having tonal coloring from PET comprising: an extruder (202); a static mixing assembly (208) coupled to the extruder and comprising a housing and one or more individual static mixing elements disposed within the housing; the method and system further comprising a plurality of colorant ports along a length of the static mixing assembly such that each of the plurality of colorant ports is configured to provide colorant (204) to a polymer stream at a different location along the length of the static mixing assembly, and one or more spinning machines (212) positioned downstream of the static mixing assembly and coupled to the static mixing assembly to receive the colored polymer stream. The spinning machine(s) may be configured to form the colored polymer stream into bulked continuous carpet filament having a tonal color effect.