polishing roll

polishing roll

[′päl·ish·iŋ ‚rōl]
(mechanical engineering)
A roll or series of rolls on a plastics mold; has highly polished chrome-plated surfaces; used to produce a smooth surface on a plastic sheet as it is extruded.
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Complete systems are also offered with coextrusion feedblocks, flexiblelip dies, and cooling and polishing roll stands.
The angular position of the first polishing roll can be varied by 30[degrees] using an X-Y adjusting device.
The system comprised a crystalliser, dehumidifier, extrusion system, polishing roll stack and winder.
At least two companies have recently made rigid polishing roll stacks for PET film that are 8.
Trio had two sheet lines with two thin ceramic-coated rolls and a third polishing roll of nickel-plated chrome.
The belt holds the sheet under pressure for a distance that is 10 to 200 times longer than is provided by a conventional polishing roll or air knife.
Left: Brushless d-c drives provide independent control to each polishing roll on this multi-configurable sheet line from HPM to prevent overheating.
In the sheet-forming area, the rolls are real polishing rolls with high PLI [pounds per linear inch], and each nip is adjusted according to the final thickness.
Finally, the polishing stack, with polishing rolls and post-cooling rolls arranged extremely close to each other, favours optimal sheet properties and transparency.
A ratchet-activated height-adjustment device raises and lowers the cooling and polishing rolls relative to the sheet die.
When the melt is too cold, the sheet surface freezes too soon for the polishing rolls to do an effective job.
Megatron cooling and polishing units ensure smooth transmission of power to chrome polishing rolls for highest quality.