Crimped Composite Thread Self-Crimping Control
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Solution Overview
Problem
Existing methods for producing crimped composite threads, such as BCF yarn for carpet yarn, face challenges including excessive shrinkage and crimping that complicate further processing like tufting, require large quantities of polymer melt, and can initiate self-crimping at undesired times, making them difficult to control and costly.
Innovation Solution
A method and device that utilize a composite thread formed from two polymer melts with different material properties, allowing for open-loop or closed-loop controlled self-crimping initiation through mechanical or thermal activation, enabling precise control over the crimping process by applying tension or temperature, thereby initiating self-crimping at a predetermined point and controlling its degree.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical or thermal crimping methods are used to form crimp in the thread, then crimping quality is improved, but excessive shrinkage occurs that complicates further processing
Solution Approach 1:
The patent applies preliminary action by forming a crimp plug in the texturizing nozzle before the thread exits, using a drafting unit to create tension that initiates self-crimping of the polymer filaments. This pre-crimping action allows controlled shrinkage to occur at a specific location, preventing excessive shrinkage downstream that would complicate further processing while still achieving the desired crimping quality
Solution Approach 2:
The patent introduces an intermediary element - the drafting unit - that mediates between the extrusion process and the final crimped product. This drafting unit creates controlled tension on the composite thread, enabling precise control over when and how the self-crimping occurs, thus resolving the contradiction between achieving good crimping quality and maintaining ease of further processing
2Loss of substance
If self-crimping is used to produce crimped composite thread, then material usage is reduced, but self-crimping initiates at undesired times making control difficult
Solution Approach 1:
The patent applies parameter changes by modifying the physical state and tension parameters of the composite thread through the drafting unit. By controlling the drafting tension and temperature parameters, the invention enables self-crimping to occur at a specific desired location rather than at undesired times, thus maintaining material efficiency while achieving precise control over the crimping process
Solution Approach 2:
The patent implements feedback control through the drafting unit that monitors and adjusts the tension applied to the composite thread. This feedback mechanism ensures that self-crimping initiates only when the desired conditions are met (at the texturizing nozzle), preventing premature or uncontrolled crimping while still utilizing the material-efficient self-crimping mechanism
3Manufacturing precision
If large quantities of polymer melt are used to achieve desired crimping quality, then crimping quality is improved, but production cost increases
Solution Approach 1:
The patent applies self-service by utilizing the inherent properties of the composite thread (different shrinkage behaviors of first and second polymer melts) to enable self-crimping. This eliminates the need to use excessive polymer melt to achieve crimping quality, as the system uses its own material properties to generate the crimp effect, thereby reducing material consumption while maintaining production cost-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
This approach allows for the production of crimped composite threads with improved crimping quality and reduced material usage, enabling more efficient and cost-effective processing by actively initiating self-crimping, thus avoiding the complications of excessive shrinkage and crimping in existing methods.
Implementation Method 1
the first and the second polymer melt each have a different material property so that self-crimping of the composite thread can be initiated open-loop and/or closed-loop controlled by an active crimping initiation
Implementation Method 2
allowing for open-loop or closed-loop controlled self-crimping initiation through mechanical or thermal activation, enabling precise control over the crimping process by applying tension or temperature
Implementation Method 3
allowing for open-loop or closed-loop controlled self-crimping initiation through mechanical or thermal activation, enabling precise control over the crimping process by applying tension or temperature
Data Source
AI summary
The invention relates to a method and to a device for producing a crimped composite thread. The crimped composite thread includes a first polymer melt and a second polymer melt. The first polymer melt and the second polymer melt are arranged next to one another, in particular side-by-side, in portions in such a way that a composite thread is formed. The first polymer melt and the second polymer melt each have a different material property so that self-crimping of the composite thread is initiated by means of an active crimping initiation. Additionally, there is a system for producing a crimped composite thread from a bulk continuous filament yarn for carpet yarn using the method and the device.