The loop blowing and cooling tow process is an important step in the production process of recycled polyester staple fiber. In order to reduce costs in production, there is generally no professional air conditioner. In summer, a water curtain is used at the air inlet of the fan to reduce the wind temperature, and in winter, steam is sprayed to increase the wind temperature and at the same time play a role in regulating rheumatism.
In the production of recycled polyester staple fiber, the spinning speed is high and the heat exchange capacity is increased, the tow cooling should be accelerated, and the wind temperature should be lower. In order to increase the post-stretching ratio, choose a lower wind temperature; the wind temperature is low, the fiber pre-orientation degree is low, and the post-drawing ratio can be larger. Choosing a suitable wind temperature can control the crystallinity of the fiber and reduce the breakage of the wool. , And is conducive to the subsequent processing, the wind temperature is generally controlled at 20-30 ℃.
Increasing rheumatism can increase the specific heat of the cooling air, accelerate the cooling of the thread, reduce the static electricity generated during spinning, reduce the jitter of the thread, which is conducive to the cooling of the tow, the temperature is constant, and the silk is reduced; the wind humidity is low, the silk The feel of the bundle is dry and astringent, the tow cooling is uneven, and there are more broken ends. Relative humidity is controlled at 65-80%
Recycled polyester staple fiber has a large number of spinning filaments and dense tows. If the wind speed is very low, the cooling air can only touch the outer tow and cannot blow the inner tow, resulting in a large difference in cooling conditions between the inner and outer tows, which increases the original yarn Uneven dryness and increased silkiness. The wind speed is subject to the uniform blow to all tows, generally 0.5-4.0m/s.
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