Importance

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Abstract

A method for creating random shadow patterns in formed vinyl sheet to be used as siding material for buildings. The method includes the step of extruding a flat, hot web of vinyl material having a predetermined thickness and a predetermined distance between the edges thereof, then embossing a graining pattern on one face of the web, cooling the web after it has been embossed and then gathering the web toward the center thereof whereby to reduce the distance between the edges thereof, the web then being preformed, by folding the same along longitudinally extending lines. The sheet is finally formed while restraining the edges of the web whereby to create peaks and valleys cross-sectionally of the web to thereby present the random shadow pattern which is found attractive in finished vinyl siding. The apparatus for fabricating such formed vinyl sheet with random shadow patterns therein includes means for extruding the hot, flat web of vinyl material with a predetermined thickness and a predetermined distance between the edges thereof; means for embossing a graining pattern in one face of the hot web; a centrally disposed eccentric wheel which raises the center of the web in an undulating rib to alter its pattern and which reduces the distance between the edges thereof; a pair of spaced apart rollers which engage the web as it moves from the wheel whereby to again raise the center thereof and further reduce the distance between the edges of the web; and a forming fixture having a passage therein through which the web is passed for final forming into the finished sheet.

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First Claim