METHOD FOR FABRICATING A POLYOLEFIN SHEET USING A ROLLER DEVICE
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United States of America Patent
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Issued Date -
Sep 20, 2012
app pub date -
Dec 2, 2010
filing date -
Dec 7, 2009
priority date (Note) -
Abandoned
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Abstract
Provided herein is a method of manufacturing a polyolefin sheet using a circulating belt and a first roller, comprising the steps of: heating polyolefin resin to melt polyolefin; and forming the molten polyolefin into a polyolefin sheet using an extruding die, wherein the circulating belt includes a plurality of second rollers (cooling rollers) which come into contact with an inner side of the circulating belt and are arranged in a circle around the circulating belt running in a circle and which cool the rotating circulating belt; a temperature of the circulating belt is maintained at 0˜30 to cool the polyolefin sheet such that the polyolefin sheet has desired thickness, a temperature of the first roller is set to a specific temperature between 40 and 120, and the temperature of the first roller is maintained in a temperature range of the specific temperature ±5; and a linear speed of the molten polyolefin sheet is substantially equal to a rotation speed of the circulating belt or the first roller to obtain a polyolefin sheet having a thickness of 0.05˜0.45 mm and a width of 1100˜1700 mm The method is advantageous in that a wide-width polyolefin sheet having excellent flatness and a small thickness deviation can be manufactured.
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