Vacuum heat insulation cover plate for granulation template

Abstract

The invention relates to an underwater granulator granulation template, in particular to a vacuum heat insulation cover plate for the granulation template. The vacuum heat insulation cover plate provided by the invention is arranged on the surfaces of an inner ring and an outer ring of the granulation template to be capable of insulating heat conduction, convection and radiation in these portions,the heat-preservation and heat-insulation performance of the portions is improved, the transmitting speed of temperature dropping generated by inner ring and outer ring areas under the action of cooling water towards the edge of a template granulation band is reduced, the temperature difference between the edge of the template granulation band and the central portion is reduced, and the granulation quality is improved. The vacuum heat insulation cover plate for the granulation template comprises a lower cover plate, a middle support grid plate, an upper cover plate and a high-temperature resistant heat insulation coating. According to the vacuum heat insulation cover plate for the granulation template, a main body area of the vacuum heat insulation cover plate is provided with a pluralityof independent vacuum cavities which do not communicate with each other, the inner side of the lower cover plate is provided with the high-temperature resistant heat insulation coating, and the outward convection, conduction and radiation loss of internal heat of the granulation template is insulated.

Description

technical field [0001] The invention relates to a granulation formwork of an underwater granulator, in particular to a vacuum heat insulation cover plate for the granulation formwork. Background technique [0002] The underwater granulator is a plastic granulation equipment in which the melt is extruded from the granulation template, the surface of the granulation belt is in contact with cooling water, and solidified by a granulation knife. The material in the molten state, under the extrusion of the screw of the extruder or the melting pump, enters the feeding cavity of the heated granulation template, and then is extruded to the discharge die hole, and extrudes the granulation template granulation belt When the surface is sprayed with cooling water, the molten material solidifies rapidly. In the gap between the cutting knives arranged at intervals, the material is extruded into a cylinder of predetermined length under the time difference between the two granulating knives ...

AI Technical Summary

Problems solved by technology

[0008] These measures have played a certain role, but the outer cover plate of the prior art is a solid metal cover plate, which cannot effectively block heat conduction at this position. When there is a higher heat preservation requirement on the surface of the formwork, the effect of the solid metal cover plate will be reduced. not very obvious

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