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US 5,032,210 AGranted
Apparatus for the manufacture of tension screens
AssigneeSweco, Incorporated
InventorsAri M. Hukki, Gerald P. Salladin
Life of this patent
Estimating the term…
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AssigneeSweco, Incorporated
InventorsAri M. Hukki, Gerald P. Salladin
Estimating the term…
A screen assembly, the process for its manufacture, the apparatus used in the process and an adhesive presenting a system and the final product for accurately tensioned bonded screens. The screens include a screen frame and screen cloth bonded thereto by adhesive using bisphenol F epoxy resin, amine adduct hardener, a substantial percentage of amorphous silica and small amounts of glycerin and fumed or precipitated silicon dioxide. Titanium dioxide may also be employed for color. A screen assembly apparatus includes a screen cloth tensioning frame and a platform positionable adjacent a tensioned screen cloth. The platform includes heating elements about the periphery of a sheet heater on a lift table. The heating elements receive a screen frame which can be lifted into contact with a screen cloth in the tensioning frame. The sheet heater approaches the screen cloth itself. A thermal control cycle is presented which allows the screen frame to cool prior to the tensioned screen. Blowers enhance the cooling process of the screen frame. Resilient devices are provided to maintain tension in the screen cloth irrespective of heat expansion and to maintain a uniform pressure of the peripheral heating elements against the screen frame and in turn against the screen cloth.
A screen assembly station for bonding screen cloth to screen frames, comprising
The screen assembly station of said 1 wherein said central sheet heater includes a heater sheet with heating elements embedded therein, an insulated plate upon which said heater sheet is positioned and a heat conducting sheet positioned on said heater sheet, said insulated plate, said heater sheet and said heat conducting sheet being substantially coextensive.
A screen assembly station for bonding screen cloth to a screen frame, comprising
A screen assembly station for bonding screen cloth to a screen frame, comprising
Dependencies are inferred from the claim text.