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source:Plastic pellet dryer
Author:plastic dryer
time:2020年10月31日 10:19:36

plastic dryer, Dehumidifying dryer, Plastic pellet dryer, plastic Dehumidifying dryer
Polyethylene terephthalate (PET for short) is the main raw material for producing granular melt-spun polyester filaments. The moisture content of undried PET is usually about 0.4%. Removal of water in PET can avoid severe hydrolysis of PET during melt spinning. Severe hydrolysis will reduce the molecular weight of PET, the quality of silk will be reduced, and even spinning. Removal of water can avoid the formation of entrained water vapor and bubbles in the monofilament, which may cause wool and breakage. It can avoid uneven dyeing caused by different spinning water content. Due to the high spinning temperature and long melt residence time of filaments, PET with low moisture content is required. It can be melt-spinned at a speed of at least 30 ppm, so the PET raw material must be dried before spinning. The existing drying and dehumidification system heats the high-pressure space of the air compressor to 180°C, and then sends it directly to the PET drying tower for dehumidification. The raw materials are heated by the hot air flow, and the moisture is taken away by the air compressor. The moisture in the airflow is very small, and the moisture in the hot airflow entering the PET drying tower is very high, which will affect the dehumidification efficiency. In addition, the high-pressure airflow directly enters the PET drying tower. Sometimes the air pressure is unstable and the dehumidification efficiency is not high.
In order to solve the above-mentioned problems in the prior art, the purpose of the PET dehumidification dryer is to provide an effective and stable drying and dehumidification system for PET particles, which are raw materials for the production of polyester filaments. After drying the raw material of PET pellets, the moisture content reaches below 20ppm, the wool yarn rate of the final product is greatly reduced, and the strength of the finished yarn is also improved. The PET particle drying and dehumidifying system provided by the utility model is a raw material for producing polyester filaments, and includes a filter, a freeze dryer, an adsorption dryer, a pressure reducing valve and an electric heater. The above equipment is connected by air pipes, the input of the filter is connected to the air compressor, the output is connected to the refrigeration dryer, the refrigeration dryer is connected to the adsorption dryer, the dryer is connected to the pressure reducing valve, the heating device is electrically connected, and the electric heating The device is connected to the PET drying tower. The adsorption drying tower is equipped with molecular sieve as the adsorbent, and the air after drying, heating and pressure stabilization enters the PET drying tower. The PET particle drying and dehumidifying system for producing polyester filaments provided by the utility model has beneficial effects, that is, the dew point of compressed air treated by the dehumidifying system can be as low as -90°C. When it is less than 20 ppm, the wool yarn rate of the final product is greatly reduced, and the breaking strength of the finished yarn is also improved.
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In conjunction with an embodiment, the drying and dehumidifying system for PET particles provided by the present invention will be described in detail. PET particles are the raw material for the production of polyester filaments. In this embodiment, the PET pellet drying and dehumidification system used to produce polyester filaments includes
1, filter
2. Refrigeration dryer
3. Adsorption dryer
4 pressure reducing valve
5, and electric heater
The above devices are connected by trachea:
The input end of the filter 1 is connected to the air compressor, the output end is connected to the refrigeration dryer 2, the refrigeration dryer 2 is connected to the adsorption dryer 3, and the dryer 3 is connected to the pressure reducing valve. Device 5 is connected to an electric heating device. The electric heater 5 is connected to the PET drying tower 6. The adsorption drying tower 3 is filled with molecular sieve as an adsorbent and dried, and heated and stable pressure air enters the PET drying tower. The pressure of the gas sent from the air compressor is usually 0.5 to 0.6 MPa. After being purified by the filter 1, it enters the freeze dryer 2 for pre-dehumidification. The dew point of the air in the freeze dryer is 2-4°C, and then the gas enters the adsorption drying tower 3 equipped with molecular sieve for drying. The output gas is reduced to 0.15MPa through the pressure reducing valve, and then heated by the electric heater 5 and entered. The gas temperature of the PET drying tower 6 is about 180°C, which is used to dehumidify the PET. The particles in the high temperature drying tower. After drying the raw material of PET pellets, the water content is less than 20 ppm.

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