Vertical roll-stand setups typically struggle while producing that type of sheet, because the molten plastic tends to droop while it exits the horizontal sheet die lip and enters the primary nip point of the chill rolls, where the transformation from molten plastic to sheet takes place, PTi said.
That sagging also can cause premature cooling of the molten curtain of plastic as the material contacts the middle roll at an undesirable point before the primary nip is reached.
With the Revolution roll stand, the plastic exits the die vertically downward, so it can be accurately placed between the primary nipping rolls, ensuring that the material contacts both sides at precisely the same moment.
PTi said the Revolution technology has yielded benefits for producing high-quality, clarified, thin-gauge polypropylene sheet.
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