1.Texture

Ring spinning and rotor spinning have great differences because of their different yarn forming principles. The fibers in the ring spinning yarn are arranged closely and evenly, and the fiber arrangement in the yarn section is loose inside and tight outside; The fiber arrangement of rotor spinning is relatively loose, so ring spinning has less hairiness than rotor spinning, the fabric surface is relatively smooth, and the feel is fine and crisp. The hairiness on the surface of rotor spinning fabric has a thick feeling, and the feel is plump and soft.

2.production processes

Ring spinning is twisting with a steel ring, and rotor spinning is twisting with a rotor. It is the last process of spinning. The machines are different, and the front spinning is roughly the same when spinning different yarns.

3.Yield

The output of rotor spinning is relatively large.

In ring spinning, the output is smaller than that of rotor spinning

Rotor spinning is a new textile technology and ring spinning is an old spinning technology

physical property

1.Color: polyester fiber is generally milky white with mercerization. To produce Matt products, the matting agent TiO2 should be added before spinning. To produce pure white products, the whitening agent  should be added. To produce colored yarn, the pigment or dye should be added into the spinning melt.

2.Surface and cross section shape： The surface of conventional polyester is smooth and the cross  section is nearly round. If the profiled spinneret is used, it can be made into fibers with special cross-section, such as triangular, Y-shaped, hollow and so on

3.Density: when polyester is completely amorphous, the density is 1.333g/cm3. It is 1.455g/cm3 when  fully crystallized. Generally, polyester has higher crystallinity, and the density is 1.38 ~ 1.40g/cm3,  which is similar to wool (1.32g/cm3).

4.Moisture regain: the moisture regain of polyester is 0.4% under standard condition, which is lower  than that of acrylic (1% ~ 2%) and nylon (4%). Polyester has low hygroscopicity, so its wet strength  decreases less and the fabric washability is good; However, the electrostatic phenomenon is serious  during processing and wearing, and the air permeability and moisture absorption of the fabric are poor.

5.Thermal properties: softening point t of polyester is 230-240 ℃, melting point TM is 255-265 ℃, decomposition point t is  about  300 ℃.  Polyester can burn in the fire, curl and melt into beads, with black smoke and fragrance.

6.Light resistance: its light resistance is second only to acrylic fiber. The light resistance of polyester is  related to its molecular structure. Polyester only has a strong absorption band at 315 nm, so the  strength loss is only 60% after 600 hours of sunlight exposure, which is similar to that of cotton.

7.Electrical properties: polyester has poor conductivity due to its low moisture absorption, and its  dielectric constant is 3.0 ~ 3.8 in the range of – 100 ~ + 160 ℃, so it is an excellent insulator.

（1） Light weight

The density of polypropylene fiber is 0.90-0.92 g/cm3, which is the  lightest  among all chemical fibers, 20% lighter than  nylon,  30%  lighter  than polyester and 40% lighter than viscose fiber.  Therefore, it is suitable  for the floc packing or ski suit,mountaineering clothing and other fabrics  of winter clothes.

(2) High strength, good elasticity, wear resistance and corrosion  resistance

Polypropylene fiber has high strength (same in dry and wet state) and is an ideal material for fishing  net and cable; Its strength is similar to that of polyester and nylon, and its resilience is comparable to  that of nylon and wool, much higher than that of polyester and viscose fibers; Polypropylene fiber has  poor dimensional stability, easy pilling and deformation, anti microbial and non wormhole; The  resistance to chemicals is better than that of ordinary fibers.

(3) It has electrical insulation and thermal insulation

Polypropylene fiber has high resistivity and low thermal conductivity. Compared with other chemical  fibers, polypropylene fiber has the best electrical insulation and warmth retention, but it is easy to  produce static electricity during processing.

(4) Poor heat and aging resistance

The melting point of polypropylene fiber is low (165-173 ℃), and  the stability of light and heat is poor. Therefore, the heat resistance and aging resistance of  polypropylene fiber are poor,  and they are not iron resistant.  But aging  resistance can be improved by adding anti aging agent when spinning.

(5) Poor hygroscopicity and dyeability

The hygroscopicity and dyeability of polypropylene fiber are the worst among the chemical fibers,  almost no hygroscopicity, and its moisture regain is less than 0.03%. The  ultra-fine polypropylene fiber has strong wicking effect, and the water vapor  can  be  removed  through  the capillary in the fiber. After the garment  is made, the comfort of the garment is better,  especially the superfine polypropylene fiber.  Because of the  increase  of  the surface area,  it can transfer sweat faster and keep the skin comfortable. Polypropylene fabric is easy to wash and  dry due to its non hygroscopicity and small shrinkage

It mainly includes woven belt and knitted belt. Ribbon, especially jacquard  ribbon, is a little similar to fabric label technology, but the fabric label is fixed by warp and thepattern is expressed by weft; The basic  weft of the ribbon is fixed, and the pattern is expressed by the warp.  

It uses a small machine. It may take a long time to make plate, produce  threading  and adjust the machine every time, and the efficiency is  relatively  low. However, it can produce a wide variety of dazzling  products, which are not always the same as thecloth label. 

The main function of the ribbon is decorative, but also functional. Such as the popular mobilephone sling.  After the ribbon is woven, it can also screen various words / patterns,  which is generally cheaper than we aving the words /  patterns directly.

Woven belt is mainly divided into non woven  belt  and  woven belt. In the market, non woven belt is more common  than woven belt.

Yarn is made of fiber, has a certain strength and fineness, and can be processed into any length of material, it is the basic unit of fabric. The thickness of cotton yarn is expressed by count, which is the length of veil per unit weight. The specific expression method is represented by s, including 10s, 18S, 21s, 32S, 40s. The higher the count, the finer the veil, the higher the count, and the higher the cotton grade, that is, the longer the fiber. At present, the British system is still commonly used in China, that is, when the cotton yarn (or other component yarn) weighs one pound (454g) and the length is 840 yards (0.9144 yards / M), the yarn fineness is one. If a pound of yarn, its length is 10 × 840 yards, its fineness is 10, and so on. The bigger the number, the thinner the yarn, the lighter, thinner and softer the fabric. The smaller the number, the thicker the yarn and the heavier, thicker and coarser the fabric.

The count of cotton yarn refers to the standard of distinguishing yarn thickness. Yarn count is the basic unit of finished fabric. The number of yarn count is inversely proportional to the degree of yarn count. The larger the number is, the finer the yarn count is. Generally, clothing, home textiles, bedding and so on have higher requirements for yarn count. According to yarn count, they are generally divided into 21, 32, 40, and rare 60 and 80 cotton yarns

21S: one or two pieces of cotton can be made into 21 pieces of 1m yarn, that is 21s cotton yarn;

32S: one or two pieces of cotton can be made into 32 pieces of 1m yarn, that is 32S cotton yarn;

40S: one or two pieces of cotton can be made into 40 pieces of 1m yarn, that is 40s cotton yarn;

60S: one or two cotton yarns can be made into 60 pieces of 1m yarn, which is 60s cotton yarn;