The technological process of knitted garments is: spinning → knitting → cloth inspection → cutting → sewing → ironing → inspection.
First, spinning 　
The purpose of spinning is to wind the incoming cotton yarn into a package of a certain structure and size to suit the production of knitting. In the spinning process, some defects on the yarn are eliminated, and the yarn has a certain uniform tension. The yarn is subjected to necessary auxiliary treatments such as waxing and oiling to improve the weaving performance of the yarn. Improve production efficiency and improve product quality.
Second, weaving
Weaving is the process of weaving the yarn into a bundle of yarns and forming it into a fabric by a loom. This is also the fundamental difference between knitted garments and woven garments.
Weaving methods can be divided into two major categories: weft knitting and warp knitting. Most of the knitted fabrics are weft knitted fabrics. Weft knitting is to feed one or several yarns from the weft direction to the knitting needle of the knitting machine, so that the yarns are sequentially bent into loops, and the yarns are knitted in series to form a weft knitted fabric. The machine used to weave this type of knitted fabric is called a weft knitting machine. Weft-knitting is more adaptable to the type and linear density of the processed yarn, and the variety of knitted fabrics produced is also extensive. The variety of weft knitted fabrics can be used to weave woven fabrics for internal and external garments of various tissues, as well as single-piece formed and partially formed products. At the same time, the weft knitting process and machine structure are relatively simple and easy to operate. The production efficiency is relatively high. Therefore, weft knitting has a large proportion in the knitting industry. Many types of weft knitting machines are generally distinguished by the number of needle beds, needle beds, and needle types.
Warp knitting consists of one or more sets of yarns arranged in parallel on the knitting needles and woven in the longitudinal direction. The machine used to weave this type of knitted fabric is called a warp knitting machine. The disentanglement and extensibility of general warp-knitted fabrics is smaller than that of weft-knitted fabrics. Its structure and shape are more stable and its use is wider. In addition to fabrics for clothing, it can also produce mosquito nets, curtains, and laces. Decorative fabrics, medical fabrics, and so on, warp knitting machines can also be used to distinguish between needle beds and needles.
Third, inspection cloth 　
Because the quality of the grey fabric is directly related to the quality and yield of the finished product, before cutting, it is necessary to check whether the number of horses, size, density, batch number and line density meet the requirements according to the cutting cloth batching list. Conduct inspections and make marks and quality records on various defects that affect the quality of finished products, such as color flowers, missing needles, holes, and oil stains.
Fourth, cutting
The main process of cutting knitted garments is: cutting off material, borrowing, drawing, cutting and binding.
Borrowing is an important part of improving the quality of products and saving the use of materials. During the blanking process, the defects on the grey fabric should be borrowed as much as possible to the cutting position or sewing area. Knitted fabrics are cut according to the longitude and mesh materials, and cutting methods are generally used for cutting. Commonly used are flat sleeves, cross sleeves, insert sleeves, splicing sleeves, and slit sleeve sleeves.
Knitted fabrics should pay attention to the following matters in cutting:
1. Do not use the folds at the edges of the clothing and the printed edges.
2. Do not use taper markings in the cut to avoid affecting the appearance of the garment.
Fifth, sewing
The current sewing technology and equipment in China's knitting industry are mainly based on medium and high-speed sewing machines (commonly known as “flat carsâ€), medium- and high-speed overlock machines (commonly known as “Karak carsâ€), and sewing machines. .
Because the knitted fabric is composed of stitches, the edges of the cut pieces are prone to dissipate. Therefore, the edges of the pieces must be overlocked (commonly known as “cardiacâ€) and then stitched with a flat sewing machine. The sewing machine and overlock sewing machine are the main models for sewing knitwear. In the sewing process, it is generally necessary to pay attention to the following points.
1, seams. Because the knitted fabric has the characteristics of longitudinal and transverse extensibility (ie, elasticity) and the disadvantage that the edge coils are easily dissipated, the seams for sewing knitwear should meet the following requirements:
(1) The seam should have stretchability and strength compatible with the knitted fabric.
(2) The seams should be able to prevent the fabric loops from coming off.
(3) Appropriately control the density of the seams. Such as thick fabric sewing machine sewing machine density control in the 9 ~ 10 needle / 2cm, overlock sewing machine stitch density of 6 ~ 7 needle / 2cm, thin fabric sewing machine sewing density control in the 10 ~ 11 needle / 2cm, the sewing machine stitch density is 7-8 pin/2cm.
2, sutures. General cotton knitted fabrics use 9.8tex×4 or 7.4tex×3 pure cotton and polyester-cotton blended yarns, and Chemical Fiber knitted fabrics use 7.8tex×2 elastic nylon yarn and 5tex×6 nylon yarns. The suture must meet the following quality requirements:
(1) Pure cotton thread (sew thread) for sewing machine should use combed cotton thread, which has high strength and evenness.
(2) The suture should have a certain degree of elasticity, which prevents thread breakage from occurring due to meandering or squeezing of the thread during the sewing process.
(3) The suture must have softness.
(4) The suture must be even and smooth, reduce the resistance of the suture in the wire groove and pinhole, or avoid the defects such as breakage and uneven stitch tension.
3, stitches. Sewing machine needles are also called needles and needles. In order to achieve the ideal fit of sewing needles with sewing materials and sewing threads, it is necessary to select suitable sewing needles.
Sixth, ironing
Knitted garments are flattened and dimensioned by ironing. During ironing, the liner is inserted into the garment to maintain a certain shape and size of the product. The size of the liner is slightly larger than that required by the garment to prevent the size of the liner from being too small after retraction. The ironing temperature is generally controlled between 180°C and 200°C. It is safer, and it is not easy to hot yellow and coke.
Seven, product inspection
Finished product inspection is a comprehensive inspection before product leaving the factory, including the appearance of quality and internal quality of the two major projects, the appearance of inspection content tolerances, appearance defects, seam fastness and so on. The intrinsic inspection items include fabric unit area weight, color fastness, shrinkage and so on.
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