Centrifugal pellet dryer screen

Abstract

A centrifugal pellet dryer screen (540) especially adapted for drying polymer pellets and micropellets includes an exterior or outer support screen (542), an inner screen (546) of an irregular or rough surface, and an optional middle screen(s) (544) sandwiched between the outer support screen and the inner screen. The screen layers are in intimate contact and the multi-layer screen assembly produces drier pellets and micropellets exiting the dryer. Plugging of the dryer screens and banding of the pellets or micropellets are significantly reduced.

Description

[0001] This patent application is a continuation re-application of the part of the US Patent Application Serial No. 11 / 017,216 filed on December 21, 2004, owned by the same assignee as this application. Technical field [0002] The present invention generally relates to a sieve loaded into a centrifugal granule dryer for drying, which is produced by a wet granulator, a strand cutter, a water ring granulator or similar granulator, The slurry of water and particles enters the particle sieve of the dryer. More specifically, the present invention relates to centrifugal particle dryers and dryer screens particularly for drying polymer particles and microparticles. [0003] The dryer screen of the present invention includes a peripheral or external support screen or plate, an optional intermediate screen and an internal screen. The outer support plate, the middle and the inner screen are in close contact. The sieve is supported in a centrifugal particle dryer, and is similar to that desc...

AI Technical Summary

Problems solved by technology

Thus, to date, centrifugal particle dryers with prior art sieves have generally been ineffective in drying polymer microparticles

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