What can be written about the process flow of fibers

The fibers are as follows:The preparation of chemical fibers is usually made into a spinning melt or solution from natural or synthetic polymer substances or inorganic substances, and then filtered and metered, extruded into a liquid fine stream by the spinneret, and then solidified into fibers. At this time, the fiber is called primary fiber, its mechanical properties are very poor, and it must go through a series of post-processing processes to meet the requirements of textile processing and use.

Post-processing mainly focuses on stretching and heat setting of fibers to improve the mechanical properties and dimensional stability of fibers. Stretching is the orientation of macromolecules or structural units in primary fibers along the fiber axis; Heat setting is mainly to relax the internal stress in the fiber. The post-processing of wet-spun fibers also includes washing, oiling, drying and other processes.

Introduction:

Fiber (fiber; Fibre) refers to a substance composed of continuous or discontinuous filaments.

In plants and animals, fiber plays an important role in maintaining tissues. Fiber is widely used, can be woven into fine thread, thread and hemp rope, and can also be woven into a fiber layer when making paper or weaving felt; At the same time, it is also commonly used to make other materials, and to form composite materials together with other materials.

Fibers are roughly divided into natural fibers and chemical fibers, natural fibers include cotton, linen, wool, rabbit hair, silk and so on. Natural fibers are already fibrous at the beginning of the harvest, such as freshly picked cotton, freshly sheared wool, and so on. The chemical fibers mainly include polyester, nylon (nylon), spandex (lycra) and so on, which are made by spinneretting after chemical synthesis.

Production process. 1.Slice spinning:

2.Melt Spinning:

Terephthalic acid + ethylene glycol Ethylene terephthalate (five-kettle polymerization or three-kettle polymerization) Melt filtration Pressurization Cooling Five-way valve Melt distribution pipe Spinning box Metering pump Component Side blow Tanker Pre-network Polyester POY tensioner Feed roller 1st heater False twister 2nd hot box 3rd roller Winding roller Polyester DTY

Introduction to Synthetic Fibers.

Synthetic fiber is a synthetic linear polymer with suitable molecular weight and soluble (or fusible) properties, which is spun and formed and post-processed. These polymers with fibroforming properties are often referred to as fibroforming polymers.

Compared with natural fibers and man-made fibers, the raw materials of synthetic fibers are prepared by synthetic methods, and the production is not limited by natural conditions. In addition to the general superior properties of chemical fibers, such as high strength, light weight, easy to wash and dry quickly, good elasticity, and not afraid of mold, synthetic fibers of different varieties have some unique properties.

Functional classification. 1. High-temperature resistant fibers, such as polybendazole fibers;

2. High-temperature corrosion-resistant fibers, such as PTFE;

3. High-strength fibers, such as polyterephthalyl p-phenylenediamine;

4. Radiation-resistant fibers, such as polyimide fibers;

5. In addition, there are flame retardant fibers, polymer optical fibers, etc.

The production process of flower skewers is divided into: slicing - fuse - spinning - sizing - desizing - weaving - dyeing - post-treatment - inspection.

Chemical fiber is a fiber with textile properties prepared by using natural polymer compounds or synthetic polymer compounds as raw materials, through the preparation of spinning stock solution, spinning and post-treatment.

The length, thickness, whiteness, gloss and other properties of the fiber can be adjusted during the production process. And they have the advantages of lightfastness, wear-resistant, easy to wash and dry, no mildew, and no moth. It is widely used in the manufacture of clothing fabrics, filter cloths, conveyor belts, water hoses, ropes, fishing nets, electrical insulating wires, medical sutures, tire cord fabrics and parachutes, etc.

Generally, polymer compounds can be made into solutions or melts, pressed out of the pores of the spinneret, and then coagulated into fibers. The product can be continuous filaments, short fibers cut to length, or uncut tows, etc. The trade name of chemical fibers is temporarily stipulated in China that synthetic staple fibers are all named "fiber" (e.g., nylon, polyester), cellulose staple fibers are all called "fiber" (e.g., viscose, cupro), and filament is added with the word "silk" at the end, or "fiber" and "fiber" are changed to "silk".

There are generally two methods for the production of synthetic chemical fibers, one is melt spinning, and the other is solution spinning. The general process of polyester melt spinning and slice spinning is like this, which is the typical method of melt spinning, and other melt spinning is similar to this.

Slicing - fuse - spinning - sizing - desizing - weaving - dyeing - post-treatment - inspection.

That's pretty much it.