Variable Twist Yarn Spool for Zero-Twist Unwinding
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Solution Overview
Problem
Current yarn twisting technologies face challenges in maintaining constant zero twist when unwinding in one direction and variable twist in the opposite direction, leading to inefficiencies and reduced productivity due to complex creel systems and high yarn tensions during scutching.
Innovation Solution
A yarn spool and twisting process where the twist value is constant at zero twists per meter when unwound in one direction and variable at 2/(ID*π) when unwound in the opposite direction, with the twist value associated with the spool's winding/unwinding diameter, allowing for efficient scutching and reduced tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional yarn twisting technologies are used, then yarn can be twisted and wound on spools, but the twist value cannot maintain constant zero when unwinding in one direction and variable twist in the opposite direction, leading to complex creel systems and high yarn tensions
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the twist value based on the unwinding direction and spool diameter. When unwinding in the first direction, the twist value is maintained at zero; when unwinding in the opposite direction, the twist value is set to 2/(ID*π) where ID is the spool diameter. This directional-dependent parameter adjustment eliminates the need for complex creel systems while maintaining precise twist control.
2Productivity
If conventional yarn twisting technologies are used, then yarn can be twisted and wound on spools, but high yarn tensions occur during scutching, reducing productivity
Solution Approach 1:
The patent applies preliminary anti-action by pre-establishing the twist value configuration that counteracts tension forces during scutching. By setting the twist value to 2/(ID*π) in the opposite unwinding direction, the system creates a preliminary counterbalancing effect that reduces yarn tension during the scutching process, thereby improving productivity without requiring additional force compensation mechanisms.
Data Source
AI summary
A spool of yarn of natural, synthetic or artificial textile fibres, with the torsion value of the plied yarn (α) throughout the spool (1) being variable, and being associated with the instantaneous winding/unwinding diameter (DI) of the spool (1), equal to α (tpm)=1/(DI*π) such that, on unwinding the yarn as twisted in a first direction N-S, the torsion value of the yarn, once unwound as twisted (β) is constant throughout the spool and is essentially equivalent to 0 tpm, and such that, on unwinding the yarn as twisted in a second direction S-N, opposite to the first direction, the torsion value of the yarn, once unwound as twisted (β), is variable throughout the spool and is equivalent to β′ (tpm)=2/(DI*π). Process for the generation of the spool disclosed, and yarn twisting machine for the generation of the spool disclosed.