In the twisting process of filament polyester or nylon 66 sewing thread & embroidery thread, twist uniformity is a crucial indicator for measuring the quality of thread manufacturing. It is a core technical parameter that greige thread producers must focus on long-term and strive to achieve. Excellent twisting manufacturers can control twist uniformity below 2%, or even below 1%.
I. What is Twist Uniformity?
Simply put, it refers to the stability and consistency of the number of twists applied per unit length of sewing thread.
This non-uniformity can be divided into two dimensions:
II. The Significant Implications of Twist Uniformity
Twist uniformity has a decisive impact on the final performance of the sewing thread, the smoothness of the sewing process, and the quality of the finished garment. Its significance is mainly reflected in the following aspects:
1. Affects Thread Strength and Durability:
● Over-twisted sections: Cause excessive filament distortion, increasing internal stress, leading to thread embrittlement, hardening, and reduced strength, making it prone to breakage during sewing.
● Under-twisted sections: Result in a loose thread structure with insufficient cohesion between filaments, leading to low strength, poor abrasion resistance, and a tendency to fuzz and break.
● Uniform twist ensures the sewing thread achieves optimal and consistent strength throughout its length, maximizing the raw material's potential. farerthread.com
2. Determines Sewing Appearance and Performance:
● Stitch Appearance: Uneven twist causes uneven stitch luster, "ripples" or "cloudiness," affecting aesthetics.
● Sewing Smoothness: Twist variation causes fluctuating thread tension, leading to skipped stitches, thread breaks, poor stitch formation, significantly reducing sewing efficiency and increasing downtime.
● Stitch Uniformity: Uneven twist affects the friction of the thread passing through the needle eye and shuttle, causing inconsistent stitch tightness.
3. Impacts Downstream Processes and Final Product Quality:
● Dyeing Uniformity: Sections with different twist levels absorb dye at different rates, causing color differences or streaks, especially evident in package dyeing.
● Shrinkage Consistency: Twist affects the thread's thermal shrinkage properties. Threads with uneven twist may cause local irregular shrinkage during fabric finishing, leading to seam puckering or fabric distortion.
● Abrasion and Fatigue Resistance: A uniform structure provides consistent abrasion resistance, ensuring the seam withstands friction evenly during wear and washing, preventing localized premature damage. farerthread.com
4. Ensures Production Stability and Cost-Effectiveness:
● High-quality sewing threads with uniform twist significantly reduce sewing faults, improve the efficiency of automated sewing equipment, and lower defect rates and labor repair costs.
III. Main Process Causes of Twist Non-Uniformity
● Unsteady operation of the twisting machine and differences in spindle speed.
● Fluctuations and unstable control of yarn tension.
● Inherent uniformity of the filament raw material.
● Wear of yarn guiding components, improper process parameter settings, etc.
IV. Suggestions for Improving Sewing Thread Twist Uniformity
1. Try to equip excellent twisting equipment.
Farer Thread adheres to a long-standing #Equipments Update In Turn Circular Plan, maintaining continuous competitiveness in equipment technology.
2. Responsible, skilled and stable twisting machine operators is paramount.
Even with the best equipment, irresponsible operation leads to frequent quality issues. A core competency of Farer Thread is its highly responsible team, benefiting from the #Skilled Operators Under Position Level Series.
3. Establish a mature twisting production system.
This includes work standardization, process stabilization, and systematic equipment maintenance. These tasks are numerous and complex and require long-term persistence. Fortunately, through 20 years of twisting experience, Farer Thread has established a very mature operation system for filament sewing and embroidery thread, such as our #Spindles Monitor In Turn system for equipment maintenance, and remains committed to continuous improvement.
Summary
The twist uniformity of filament sewing thread essentially represents the concentrated reflection of their internal structural quality. It is far more than a mere process parameter; it is a key bridge connecting raw materials, equipment, process, and end-use. Therefore, in the manufacturing and quality control of sewing thread twisting, the testing and control of twist levels and its uniformity are vital core aspects.
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