Novel pre-crystallizer

Abstract

The invention discloses a novel pre-crystallizer belonging to the technical field of before-spinning drying equipment. A slice inlet is arranged at the left-upper part of the wall of the pre-crystallizer, a blocking plate and two adjustable baffle plates are arranged under the slice inlet, the two adjustable baffle plates are fixed on the left side of the wall of the pre-crystallizer in parallel, a leaking plate is arranged between the two adjustable baffle plates, a porous plate is arranged under the leaking plate, left sides of the two adjustable baffle plates are connected with a circular hot air channel, the other side of the hot air channel is connected with an air heater, the middle of the upper part of the wall of the pre-crystallizer is provided with a gas outlet, a tapered cap is arranged inside the gas outlet, a slice outlet is arranged at the right-lower part of the pre-crystallizer, the left side of the lower surface of the porous plate is provided with a circular air duct, the circular air duct is connected with a pulse airflow generator, and the right side of the pulse airflow generator is provided with a strong hot air duct which is connected with a strong air heater. A slice in the pre-crystallizer is simultaneously acted by hot air from two directions to be continuously turned and pre-crystallized and pushed ahead, and is more fully dried and crystallized under the action of the strong hot air, thus the slice can be continuously produced.

Description

technical field [0001] The invention relates to a novel pre-crystallizer, which belongs to the technical field of pre-spinning drying equipment. Background technique [0002] The pre-crystallizer is mainly used in the PET pre-crystallization process to keep the slices in small relative motion and increase their melting temperature to prevent the slices from congealing and create favorable conditions for subsequent high-temperature drying. It has the ability to pass through the material and perform heat exchange along the way. Continuously take away the moisture, remove a considerable part of the surface adsorbed water, make the slices have a certain degree of crystallinity, and complete the high-efficiency pre-crystallization drying process. Pre-crystallization can be carried out in an ordinary drying oven or in a mechanical dryer similar to a high-speed mixer. When performing pre-crystallization in an ordinary drying oven, it should be noted that the pre-crystallization pr...

AI Technical Summary

Problems solved by technology

When performing pre-crystallization in an ordinary drying oven, it should be noted that the pre-crystallization process can be considered as the end when the polymer slice loses its transparency. The disadvantage of this method is that the pre-crystallization is insufficient or excessive, and the degree of pre-crystallization is observed with the naked eye. , the subjective error is too large, which affects the quality of the pre-crystallized slice

Pre-crystallization using a mechanical dryer similar to a high-speed mixer relies on mechanical friction to heat up the material. This method has a fast heating rate and is more beneficial to the volatilization of water, but it can only be used for small-scale discontinuous production.

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