End dam seal for blade type fountain coaters
AssigneeBeloit Corporation
InventorRobert J. Alheid
Life of this patent
Estimating the term…
Abstract
An end dam sealing means for at least one end of a coating application chamber defined in part by a doctor blade and backing surface means such as a roll on which a web to be coated travels continuously, is adapted for engaging sealingly with a chamber surface area, the doctor blade and the backing surface means roll, and the sealing means has a device for draining coating material that may migrate from the application chamber between the sealing means and the backing surface means roll. Static seal is provided for the contiguous end of a pressure drop chamber and a slit orifice which communicate with the coating application chamber.
Claims20
In a fountain coating applicator especially suitable for paper web coating and including a doctor blade projecting generally upwardly toward backing surface means, and having an upper edge for coating nip relation across the width of a web travelling continuously on said backing surface means;
- and means extending across at least the width of the web for supplying coating material under hydraulic pressure to said coating nip and including a coating application chamber defined in part by said doctor blade and said backing surface means, and in addition by an application chamber surface area spaced substantially below said nip, the improvement comprising:
- end dam sealing means for at least one end of said application chamber, and adapted for engaging sealingly with said chamber surface area, said blade and said backing surface means;
- said end dam sealing means comprising a closed cell elastomer body having a sealing surface sealingly engageable with said blade;
- and a wear resistant solid plastic sealing surface layer of substantial thickness carried by said body and having a face engageable with said backing surface means, said face having channel means therein between sealing surface land means for draining coating material migrating from said application chamber between said sealing means and said backing surface means.
In a fountain coating applicator especially suitable for paper web coating and including a doctor blade projecting generally upwardly toward backing surface means, and having an upper edge for coating nip relation across the width of a web travelling continuously on said backing surface means;
- and means extending across at least the width of the web for supplying coating material under hydraulic pressure to said coating nip and including a coating application chamber defined in part by said doctor blade and said backing surface means, and in addition by an application chamber surface area spaced substantially below said nip, and comprising:
- said coating material supply means being in the form of a chamber below said application chamber surface area and communicating in coating supply relation with said application chamber through a coating material extrusion slit orifice defined by and along said blade and an adjacent edge of said chamber surface area for directing coating material toward said coating nip;
- end dam sealing means for at least one end of said application chamber and adapted for engaging sealingly with said chamber surface area, said blade and said backing surface means;
- said end dam sealing means comprising an elastic body having a sealing surface sealingly engageable with said blade and a sealing face engageable with said backing surface means, said face having means for controlling migration of coating material thereacross from said application chamber;
- and
- an end sealing member in the end of said supply means chamber adjacent to said one end of said application chamber and provided with a sealing extension projecting into the adjacent end of said orifice.
In a fountain coating applicator especially suitable for paper web coating and including a doctor blade projecting generally upwardly toward backing surface means, and having an upper edge for coating nip relation across the width of a web travelling continuously on said backing surface means;
- and means extending across at least the width of the web for supplying coating material under hydraulic pressure to said coating nip and including a coating application chamber defined in part by said doctor blade and said backing surface means, and in addition by an application chamber surface area spaced substantially below said nip, and comprising:
- said coating material supply means being in the form of a chamber below said application chamber surface area and communicating in coating supply relation with said application chamber through a coating material extrusion slit orifice defined by and along said blade and an adjacent edge of said chamber surface area for directing coating material toward said coating nip;
- end dam sealing means for at least one end of said application chamber and adapted for engaging sealingly with said chamber surface area, said blade and said backing surface means;
- said end dam sealing means comprising an elastic body having a sealing surface sealingly engageable with said blade and a sealing face engageable with said backing surface means, said face having means for controlling migration of coating material thereacross from said application chamber;
- and
- said elastic body having an extension therefrom projecting into said sealing engagement within the end of said orifice adjacent to said one end of said application chamber.
Dependencies are inferred from the claim text.