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US 4,357,370 AGranted
Twin short dwell coater arrangement
AssigneeBeloit Corporation
InventorRobert J. Alheid
Life of this patent
Estimating the term…
Abstract
A coater for applying a coating material to both sides of a traveling web with the web passed over a back-up roll and a first coating such as sizing applied to the back-up roll surface in advance of a coating zone for transfer to the web at the coating zone and the second surface of the web being coated by a trailing blade coater applying pressure to the web urging it against the back-up roll.
Claims10
Apparatus for applying coating to both surfaces of a moving web comprising in combination:
- means for advancing the web including back-up means having a back-up surface for receiving and supporting a first surface of the web as the same is advanced on the back-up surface;
- a first applicator means positioned for applying a first coating to said back-up surface in advance of a location where the back-up surface receives the web so that the coating coats the first surface of the web transferring the coating from the back-up surface to the web while the web is supported as it travels through a coating zone;
- a second applicator means comprising blade mounting means and an inverted blade with the latter forming with the lower face of the web, where such web is supported on the back-up means;
- means defining an elongated pocket extending transversely of the web for receiving a second coating material to be applied to the web, which pocket is open along a longitudinally extending side of the pocket facing the web as it advances into the pocket;
- said blade including a blade body bounded along one margin by working edge, said blade being mounted on said blade mounting means with the blade body extending downwardly from said working edge and with the working edge disposed adjacent the backing surface and extending transversely of the web thereby to define a nip through which the web travels while being coated with said web being pressed against the sizing in the coating zone while the web is on the back-up in said zone;
- said applicator means further comprising extrusion means defining an elongated extrusion opening spaced a short distance below and substantially parallel to said working edge and in a position where material extruded through such opening is directed as an extruded ribbon upwardly against said blade body and said web, with such ribbon supported on one face only and such support being supplied by said blade body, said extrusion means further including means defining a chamber for coating material communicating with said extrusion opening, said applicator means being devoid of support for the opposite face of such extruded ribbon in a region extending from the extrusion opening to said backing surface;
- and
- means for supplying coating material to said chamber.
5 more elements
Apparatus for applying a coating to both surfaces of a moving web comprising in combination:
- means for advancing the web including a cylindrical horizontal back-up roll having a smooth back-up surface for receiving and supporting a first surface of a web as the web is advanced;
- first applicator means positioned ahead of the location where the web engages the roll and applying a first coating to the surface of the roll so that the coating is transferred to a first surface of the web in a coating zone;
- and
- a second applicator means having means for applying a coating to the second surface of the web in said coating zone so that the web is coated on both surfaces as it leaves the back-up roll.
1 more element
The method of coating both surfaces of a traveling web comprising the steps:
- passing the web in engagement with a moving back-up surface, applying a coating to the back-up surface in advance of the location where it is engaged by the web so that coating is transferred from the back-up surface to the web;
- and
- applying a coating to the second surface of the web while it is supported by the back-up surface simultaneously applying a force to the web for aiding in the transfer of coating from the back-up surface to the web.
Dependencies are inferred from the claim text.