Cooled vacuum pull roll
AssigneeWorldwide Converting Machinery, Inc.
InventorLeonard C. Krimsky
Life of this patent
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Abstract
A pull roll in which the outer shell of a cooling roll through which a cooling medium flows has grooves in its outer surface forming lands which support a perforated skin. Communication is provided between the shell grooves and a segmented stator groove connected to a source of reduced pressure so that the vacuum exerts a pull on the web while the cooling medium cools the web through the skin.
Claims8
A pulling roll assembly for drawing a web out of a process station including in combination a rotor comprising an outer shell, a plurality of axially extending grooves in the outer surface of said shell, said grooves being separated by lands and extending between respective locations adjacent the ends of said shell, a skin supported by said lands, said skin having perforations registering with said shell grooves, said rotor having a recess at one of its ends, said recess extending axially inwardly beyond said location adjacent said end of said shell, a stator extending into said recess, said stator having a peripheral groove of limited circumferential extent at said location, means providing communication between said shell grooves and said stator groove at said location, means connecting said stator groove at reduced pressure and means for cooling said shell.
A pulling roll for receiving a heated web around a portion of the roll periphery and for drawing said web out of a process station while cooling the web including in combination a generally cylindrical outer shell of thermally conductive material, a plurality of axially extending grooves spaced over the outer surface of said outer shell, a skin over the outer surface of said outer shell, said skin being provided with perforations communicating with said grooves, means connecting said grooves over a segment of said roll periphery limited to said portion to a region of reduced pressure to hold said web against said roll with a force sufficient to produce a pulling force upon rotation of the roll to draw said web out of said process station, a hollow outer shell disposed within said inner shell to form a space between said shells, means disposed between said shells forming a plurality of spiral passages in said space extending from one end of said roll to the other, respective hollow shafts at the ends of said roll, means forming a first plurality of conduits located at one end of said roll connecting the respective passages to the interior of one of said hollow shafts, means forming a second plurality of conduits located at the other end of said roll connecting the respective passages to the interior of the other of said hollow shafts and means for supplying coolant to one of said hollow shafts to cause coolant to flow through said conduits and through said passages and out through the other one of said hollow shafts to cool the web.
Dependencies are inferred from the claim text.