WEB PROCESSING ROLL HAVING DIRECTIONAL VACUUM PORTS

摘要

A web processing roll for handling a web of material using vacuum is provided. The web processing roll includes a roll body. The roll body defines an outer periphery against which the web of material is held. The roll body defines a vacuum passage. At least one first vacuum hole fluidly connects to the vacuum passage provides vacuum proximate the outer periphery of the roll body to hold the web of material against the outer periphery with vacuum supplied to the at least one first vacuum hole by the vacuum passage. A first flow path of the vacuum hole extends at a first angle that is non-perpendicular to the rotational axis and is directed, at least in part, axially toward one of the first and second ends at the first outlet end of the at least one first vacuum hole.

主权项

1. A web processing roll for handling a web of material using vacuum, comprising:
a roll body extending axially between first and second ends and configured to rotate about a rotational axis extending between the first and second ends; the roll body defining an outer periphery against which the web of material is held; the roll body defining a vacuum passage extending axially therein providing axial air flow generally parallel to the rotational axis, the vacuum passage being positioned radially inward from the outer periphery; at least one first vacuum hole fluidly connected to the vacuum passage and extending through the outer periphery and positioned to provide vacuum proximate the outer periphery of the roll body to hold the web of material against the outer periphery with vacuum supplied to the at least one first vacuum hole by the vacuum passage; the at least one first vacuum hole having a first inlet end and a first outlet end, the first inlet end being at an intersection of the at least one first vacuum hole with the outer periphery and the first outlet end being at the intersection of the at least one first vacuum hole with the vacuum passage; the at least one first vacuum hole defining a first flow path extending from the first inlet to the first outlet; the first flow path extending at a first angle that is non-perpendicular to the rotational axis and is directed, at least in part, axially toward one of the first and second ends at the first outlet end of the at least one first vacuum hole.