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What is the difference between ticket count (T-number) and denier for polyester sewing thread?

Ticket count (T-number) is a thread size designation system used primarily for garment and apparel sewing threads – it is an indirect measure related to thread weight per unit length, with higher ticket numbers indicating finer (lighter) thread. T-20 is heavy, T-80 is fine. Denier is a direct weight measure (grams per 9,000 metres of yarn), used primarily for industrial and technical threads – lower denier indicates finer thread (150D is finer than 300D). For garment manufacturing, specify by ticket count (T-40 for standard garments). For industrial applications (bag making, technical textiles), specify by denier and ply count (e.g., 300D/3 for medium-heavy industrial sewing).

What is the correct polyester thread for sewing stretch knit fabrics?

Stretch knit fabrics require thread with higher elongation than standard woven-fabric thread – minimum 25–30% elongation to match the fabric's stretch without seam cracking. Core-spun polyester with a textured (air-jet or false-twist textured) filament core provides the best combination of strength and stretch for knit seaming. For highly elastic fabrics (swimwear, sportswear), consider textured polyester thread (also called PTT polyester) which can deliver 35–50% elongation at the stitch level. Standard high-tenacity filament thread (low elongation 15–18%) should not be used for stretch knit seaming – it will cause seam cracking at the first significant stretch event.

How do I ensure colour consistency between thread orders for ongoing production?

Colour consistency between orders requires: (1) Record the shade number AND dye lot number from every cone in your first approved order; (2) For reorders, specify the original shade number and request matching to the original lot – provide the supplier with a physical reference cone from the original order; (3) Request pre-production lab dip approval before bulk dyeing on all reorders; (4) Accept a Delta E tolerance specification in your purchase order (Delta E <1.0 is standard, <0.5 for colour-critical applications); (5) Always conduct incoming colour check under D65 illuminant against your retained reference before releasing thread to production floor.

What thread should be used for sewing FR (flame-resistant) workwear in India?

FR workwear seams must be sewn with inherently FR thread – typically a modacrylic/polyester blend or meta-aramid (Nomex) based thread that maintains its flame-resistant properties permanently, without degradation through washing. The thread must meet EN ISO 11612 seam performance requirements – specifically the thread must not melt, drip, or contribute to flame spread. Standard polyester thread melts at 250–260 deg C and will fail in any arc flash or flash fire event even if the FR fabric performs correctly. In India, OISD-compliant FR workwear manufacturers are required to use inherently FR thread for all load-bearing and visible seams on FR garments supplied to petroleum sector customers.

What is the minimum order quantity for custom colour-matched polyester thread in India?

Most Indian polyester thread manufacturers require a minimum of 500 cones for custom colour development and initial production. This minimum reflects the practical minimum dyebatch size for consistent colour in a professional dyehouse. Some large manufacturers with automated small-batch dyeing capability accept minimums of 200–300 cones for standard-difficulty colours. Very complex colour matches or metamerism-free specifications (matching under multiple illuminants) may require 1,000-cone minimums. Colour development charges (lab dip fee: ₹500–2,000) are typically charged separately and credited against the bulk order value on approval.