Method of streakless application of thin controlled fluid coatings and slot nozzle - roller coater applicator apparatus therefor
AssigneeAcumeter Laboratories, Inc.
InventorFrederic S. McIntyre
Life of this patent
Estimating the term…
Abstract
A novel combined hot melt and other fluid preferably slot nozzle-roller coater assembly and technique enabling elimination of streaks and other aberrations caused by undissolved particles or dust and the like in the fluid, and adapted for multi-fluid mixing, if desired.
Claims34
A method of eliminating streaking effects caused by entrapped particulate matter and the like in the applicating of fluid coating material transversely along a moving web-substrate, that comprises, metering the fluid material along a zig-zag path with transverse expansion intermediate the path parallel to the transverse dimension of the web to produce at an exiting region a flowing transverse sheet of the material with substantially uniform pressure drop and fluid displacement therealong;
- impinging the sheet of material on an immediately adjacent rotatable transversely extending cylindrical surface of rotational axis parallel thereto to form a coating on said cylindrical surface;
- rotating the cylindrical surface about its axis to carry the coating upon the cylindrical surface along a circular path away from the region of exiting, said circular path being at least partly bounded by said transversely extending rotating cylindrical surface and a coaxial closely spaced transversely extending cylindrical outer surface, the coating upon said rotating cylindrical surface being carried within a transversely extending annular space between the coaxially disposed cylindrical surfaces;
- drawing the web-to-be-coated past and immediately adjacent a further region of the circular path to cause the rotating cylindrical surface to apply and meter the coating carried thereby to the web substrate;
- and adjusting the said immediately adjacent positions of the rotating cylindrical surface from the exiting region and the web substrate from the further region of the circular path, while adjusting the cylindrical surface rotational speed synchronously with relation to web speed and the fluid metering, to determine the resultant coating thinness and streakfree nature of the coating.
A method of eliminating streaking effects caused by entrapped particulate matter and the like in the applicating of fluid coating material transversely along a moving web substrate, that comprises, metering the fluid material along a path and producing at an exiting region a transversely extending flow of the material;
- impinging the transversely extending flow of fluid material on an immediately adjacent rotatable transversely extending cylindrical surface of rotational axis parallel thereto to form a coating on said cylindrical surface;
- rotating the cylindrical surface about its axis to carry the coating upon the cylindrical surface along a circular path away from the region of exiting, said circular path being at least partly bounded by said transversely extending rotating cylindrical surface and a coaxial closely spaced transversely extending cylindrical outer surface, the coating upon said rotating cylindrical surface being carried within a transversely extending annular space between the coaxially disposed cylindrical surfaces;
- drawing the web-to-be-coated past and immediately adjacent a further region of the circular path to cause the rotating cylindrical surface to apply and meter the coating carried thereby to the web substrate;
- and adjusting the said immediately adjacent positions of the rotating cylindrical surface from the exiting region and the web substrate from the further region of the circular path, while adjusting the cylindrical surface rotational speed synchronously with relation to web speed and the fluid metering, to determine the resultant coating thinness and streakfree nature of the coating.
Apparatus for streakless transverse fluid coating of a moving web substrate having, in combination, transverse line nozzle applicator means receiving metered pressurized fluid coating material and exiting the same through an opening as a transverse sheet;
- cylindrical roller means disposed immediately adjacent said opening and extending axially parallel thereto to receive the exiting transverse sheet of fluid material as a coating upon an adjacent region of the cylindrical surface of the roller means;
- means for rotating said cylindrical surface about its axis to carry the coating upon said cylindrical surface away from the opening along a circular path of travel of the roller means to a further region of said circular path where the coating is to be applied to the web substrate, said cylindrical roller means being coaxially surrounded at least in part with a closely spaced outer housing cylindrical surface to define a circular gap therebetween along which fluid material received from said opening is carried and from which said material is exited at said further region;
- and means for adjusting the separation between said opening and said roller means and the rotational speed of the roller means with respect to the fluid metering and web substrate speed to determine the resultant coating thinness and its streak-free nature.
Dependencies are inferred from the claim text.