The melting spinning is also known as the melt spinning. It refers to the heating and melting of the polymer polymer to the spinning melt with a specific viscosity. It becomes a melt filament flow, then cools and solidifies in the air or water, and then processes the wire by extending. This process has the advantages of short process, non -chemical reactions, simple equipment, low production capacity, and can achieve high -speed production.
The melting spinning wire can be divided into direct spinning method and slicing spinning method.
① The direct spinning method pump the polymerization melt after the polymerization reaction directly to the spinning machine for spinning operation.
② Slip spinning method solid polymer is melted and pumped to pump the spinning process.
Compared with other spinning craftsmanship, the spinning rosite of the melting spinning wire is the melting liquid of the fiber high polymer itself, and there is no solvent to participate; the formation of fiber and the collection process of only energy transfer, there is no exclusion and recycling solvent at all. Therefore, high -speed rolls can be used to obtain the best production efficiency.
Generally, the melting point is lower than the decomposition temperature and can be melted to form a stable fiber polymer polymer, which can be processed into a spinning product through melting spinning. In order to ensure the stability of the spinning process and maintain the physical and chemical performance of the product, the difference between the temperature and decomposition temperature of the resin melting point and the decomposition temperature can be greater than 30 ° C.
The main process steps of melting spinning include: spinning system preparation, melt -filamented pores to push filament flow, melt filament flowing and stretching while being cooled and solidifying Essence
The main functions of the filament flow stretching and pull -up operations are: to change the internal structure of the initial fiber, improve the fiber's broken strength and abrasion resistance, and reduce the elongation of fiber products.
The oil on the wire can increase the concentration of the silk (holding), keep the silk beam is not scattered; give the silk beam smooth, reduce the damage to the wire, reduce the occurrence of coats and cuts. , Drying and other processes are smooth; eliminating the accumulation of static charges generated by friction, stabilizing product quality, and ensuring safety production.
According to the different applications of the final products, the melting spinning products are also divided into long silk and short fiber, and their processing technology also has certain differences.
The process category of synthetic fiber melting melting melting melting fusion wire is based on the shape of the fiber pores of the fiber pores at the beginning of the process of process development. With the continuous development of the industry and the expansion of the application field, the cross -section shape of today's fiber is no longer just a round, and alien fibers have emerged. The so -called alien fiber refers to the fiber or hollow fiber with non -circular cross -section in the process of fiber forming. This fiber is called a alien cross -section fiber, referred to as alien fiber. Common alien holes and adult cross sections can be referred to the figure above.
Alien fibers can show a special luster; it has fluffy, dirt resistance and ball resistance; in addition, the fiber's reflection and coverage have also been greatly improved.
The emergence of composite fibers has entered the application of chemical fiber into a higher update. Composite fiber refers to two or more polymers that are not mixed on the cross section of the fiber, also known as dual -component fiber. The binding of multiple components makes the fibers produce many unique properties: it can have the elasticity and fluffy of wool; it can improve the dyeing; or can obtain a special feel and flexibility; Essence