Nitrogen gas sealed circulating PVA powder processing method
A closed cycle, nitrogen technology, applied in grain processing, etc., can solve the problems of easy combustion, large temperature influence, dust pollution, etc., and achieve the effect of improving product quality, concentrating particle size distribution width, and controlling oxygen content
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[0023] Such as figure 1 As shown, a nitrogen closed cycle PVA powder making method includes the following steps:
[0024] ⑴PVA polymer or resin with a length of 2~5mm, a width of 1~3mm, a thickness of 0.3~1.2mm and a temperature of 28~45℃ is continuously and uniformly added to the crusher 2 after the rotary air lock Ⅰ1 PVA particles.
[0025] Among them: Crusher 2 is provided by Tianhua Chemical Machinery and Automation Research and Design Institute Co., Ltd., and its patent number is ZL201220651933.3.
[0026] (2) The nitrogen is input to the crusher 2, and the PVA particles are transported to the classifier 3 for classification. The PVA particles and nitrogen are rotated by the blades set on the top of the classifier 3 to obtain large particles of PVA and the particle size of 20-40 mesh. temperature Nitrogen of qualified PVA particles <45℃; large particles of PVA fall into the lower crusher (2) under the action of centrifugal force to be crushed again.
[0027] Among them: Classif...
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