The selection of core spun yarn mainly includes the following two aspects:

1. Selection of core wire

The fineness of the core filament and the number of single filaments in it should be selected according to the use of the fabric and the spinning count. For the core filament of the same denier, the thinner the monofilament, the more the number of threads, the softer and smoother the fabric; on the contrary, the smaller the number of threads, the better the rigidity of the fabric. For coated products, the gloss of the core wire does not need to be considered, and the luminous core wire can be used to reduce the production cost; if the exposed product is produced, the gloss of the core wire should be considered, and the lustrous wire should not be used as much as possible, which will cause aurora and affect the product. Effect. For example, in the production of 11.8tex (50s) polyester-cotton core-spun yarn for skirting and shirting fabrics, ordinary low-strength and high-stretch 5.56tex (50D)/24F semi-gloss polyester filament should be used as the core yarn.

When core-spun yarn is used as sewing thread, generally choose high-strength, low-stretch bright polyester filament with more monofilaments above 7.78tex (70D)/36F. When used for burnt-out coats, bright polyester filaments below 7.56tex (68D)/36F can be used. However, for the core-spun yarn used for burnt-out fabrics, the fineness of the core yarn should be controlled too large. Generally, 7.22-8.33tex (65-75D)/36F matt or semi-gloss polyester filament is used to prevent burnout. Some are too thin, too thin and cause aurora. For the core-spun yarn used in elastic fabric, the fineness of the core yarn can be selected according to the use of the fabric. Generally, polyester type 7.78tex (70D) spandex yarn is used, and its drafting ratio is about 3.8 times. For the medium-sized (medium and low count) spandex core-spun yarn for warp-direction strong corduroy and elastic labor cloth, the draft of spandex yarn should be larger, about 3.8-4.0 times, which can ensure elastic pants wear The hips and knees have relatively high resilience.

 2. Selection of Outsourcing Fiber

If cotton fiber is used as the outsourcing fiber, in theory, the raw cotton with long length, high count and good maturity should be selected as far as possible. But it should depend on the use of the product. If it is not used for high-speed sewing thread, but for shirting fabrics or skirt materials, or other burnt-out decorative fabrics, there is no need to choose good raw cotton, because they do not need to be subjected to high-speed sewing thread. The test of strong friction and high temperature melting will not produce "peeling" phenomenon, so the use of 30mm long raw cotton can meet the requirements. However, the outer cotton of the core-spun yarn used as burnt-out fabric has less neps and impurities. It is better if rayon is used as the outsourcing fiber, with low strength, good dyeing performance and less neps and impurities.

CORE SPUN YARN-DUAN CAI CORE SPUN YARN

Product Name:	Duan Cai core spun yarn
	28/2 Core spun yarn 51% Viscose 28% Polyester 21% Nylon Blend space dyed yarn
Origin:	Jiangsu China
Brand:	RHZ CORE SPUN YARN
Craft:	RING SPUN
Material:	51% Viscose 28% Polyester 21% Nylon
Style:	For knitting ,circular knitting ,flatting knitting