Production process of physically modified rayon

The two-step process is used to make low elongation, low hook strength polyester by increasing stretch ratio and high temperature relaxation and heat shrinkage. The test proves that by properly increasing the total drawing ratio of spinning, increasing the water content of the gel tow, and re-stretching the compacted fiber and steam-drying well, a certain anti-pilling performance can be obtained. Therefore, to adapt and transform the existing spinning production process equipment and production equipment, the process is

The flow is as follows

Spinning-cold drawing -washing- Preheating—wearing stretching-oiling-drying and compacting-stretching and shrinking-steaming and setting-stretching and shrinking combined unit is the main equipment for the production of anti-pilling rayon, and it is also a technical project.The main content of the design. What the structure of the appequipment, the re-stretching and shrinking unit of anti-pilling nylon is similar to the production equipment for high-shrink nylon.

Technical transformation of production equipment

According to the production experience of high shrinkage nylon and the actual situation of anti-pilling yarn production, the production equipment is correctly adjusted.

1. Turn the drawing roller into a heating roller

The moisture content of the rope of the first dryer is 0, and the surface temperature is about The absorption of 55 is lower than the glass transition temperature of jelly, which seriously affects the continuity of production and fiber quality. In view of this situation, steam is fed to the two sets of six-roll stretching rollers, and the design is changed to heating rollers, which play a role in preheating the cable during the stretching process.

2. Cancel the drag detector at the entrance to the stretcher

Cancel the drag detector and the tension detector at the entrance of the unit and use the detection stop alarm function of the latter Combined with the tension detection function of another tensiometer

3. Transformation of the crimping machine

Change the shape of the crimping wheel pressure control into a cylinder type to maintain the gap between the upper and lower crimping wheels . And according to the width of the shrink wheel (6.5-7.4), 103dtex/mm benchmark, according to the fiber density requirements, the width of the shrink wheel is adjusted to 45mm, and the diameter of the shrink wheel is changed from 200mm to 160mm.

4. Add a guide frame

In the space between the dryer and the tension roller, add a guide frame to improve the entry condition of the cable before stretching.

5. Transformation of steam spray pipeline with wet bulb temperature

The control of wet bulb temperature is the key to the drying and compaction ofn fibers. >Usually controlled at 65°C to 80°C °C. At the same time, the technical design considered the regulation of the wet bulb temperature: the diameter of the steam spray pipe was increased to 40 mm to reduce the steam flow rate. For process control, set the dry bulb temperature in the first zone of the dryer from 100°C to 80°C. Due to the above series of changes to the production equipment, a number of defects in the internal structure of the kelon fiber have been introduced.fall (such as pores, surface roughness, etc.), and reduce the degree of orientation of macromolecules, and use low-power stretching to prevent the micropores in the fiber from thinning and elongation, so that the molecular chains can be completely shrunk, properly reducing the mechanical properties of the fibers and achieving anti-corrosion. This kind of eye fiber can be called physically modified eye fiber.

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