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US 4,968,366 AGranted
Method of manufacture of tension screens
AssigneeSweco, Incorporated
InventorsAri M. Hukki, Gerald P. Salladin
Life of this patent
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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 left 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 process for the fabrication of a tensioned screen from screen cloth and a screen frame having a bonding surface, comprising the steps of:
The process of claim 7 wherein said step of applying elastomer is to an edge of the bonding surface toward the center of the screen frame.
The process of claim 8 further comprising the step of
A process for the fabrication of a tensioned screen from screen cloth and a screen frame, comprising the steps of
A process for the fabrication of a tensioned screen from screen cloth and a screen frame having a bonding surface, comprising the steps of
Dependencies are inferred from the claim text.