US 12,214,536 B2
Filtration apparatuses and screen changer devices for polymer processing and related methods
James E. Rosamond, III, Conover, NC (US); and David C. Woodcock, Newton, NC (US)
Assigned to PSI-Polymer Systems, Inc., Conover, NC (US)
Filed by PSI-Polymer Systems, Inc., Conover, NC (US)
Filed on Feb. 25, 2022, as Appl. No. 17/680,521.
Application 17/680,521 is a division of application No. 16/405,804, filed on May 7, 2019, granted, now 11,260,570.
Claims priority of provisional application 62/667,812, filed on May 7, 2018.
Prior Publication US 2022/0355531 A1, Nov. 10, 2022
Int. Cl. B29C 48/691 (2019.01)
CPC B29C 48/6912 (2019.02) 17 Claims
OG exemplary drawing
 
1. A method of changing a screen within a screen changer device within a fluid processing apparatus, the method comprising:
heating a top spacer plate that is positioned between a top portion of a front face plate and back face plate of a screen changer device and heating a bottom spacer plate that is positioned between a bottom portion of the front face plate and back face plate causing the top and bottom spacer plates to expand to create space within a slide plate chamber of the screen changer device that is formed by the top and bottom spacer plates and the front and back face plates;
sliding a slide plate within the slide plate chamber from a first position where a first screen housing bore within the slide plate in which a first filter screen resides is aligned with flow bores in the front and back face plates to a second position where a second screen housing bore within the slide plate in which a second filter screen resides is aligned with the flow bores in the front and back face plates; and
cooling the top and bottom spacer plates such that the top and bottom spacer plates contract to decrease space within the slide plate chamber to tightly hold the slide plate in the second position between the front and back face plates preventing movement of the slide plate within the slide plate chamber.