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Molding Platens and Rubber Covered Rollers

IP.com Disclosure Number: IPCOM000079793D
Original Publication Date: 1973-Sep-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Dervay, JA: AUTHOR [+4]

Abstract

A one foam molding method is provided for manufacturing platens and the like, which replaces several fabrication and assembly operations, with acoustical benefits as well as reduced cost over conventional procedures. The present method, using the cast plastic foam process, makes the entire assembly by placing the shaft, a rubber platen, other inserts, and plastic foam molding material into a mold having the configuration of the platen assembly, processing the mold through the mold cycle, and removing the finished part.

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Molding Platens and Rubber Covered Rollers

A one foam molding method is provided for manufacturing platens and the like, which replaces several fabrication and assembly operations, with acoustical benefits as well as reduced cost over conventional procedures. The present method, using the cast plastic foam process, makes the entire assembly by placing the shaft, a rubber platen, other inserts, and plastic foam molding material into a mold having the configuration of the platen assembly, processing the mold through the mold cycle, and removing the finished part.

For the platen shown, the ratchet or index wheel 1 was coated with PLIOBOND*30 adhesive and air dried. The shaft 2 and rubber platen 3 were loaded into a steel mold. The platen 3 had a coating of PLIOBOND 161 adhesive coating on the inside diameter.

The foam plastic molding Material 4, CYCOLAC** Y-77, was loaded into the cavity between the shaft 2 and rubber platen 3. The top portion of the mold was placed in position and clamped.

The mold was heated for 25 minutes at 450 degrees F in an air circulating oven. At the end of the heat cycle, the entire mold was quenched in water to cool the mold and molded assembly to ambient temperature. The molded assembly of shaft, platen, ratchet wheel, and foam core was then removed from the mold.

The assembly was structurally good and well bonded and presented other advantages, such as:

(a) Torque strength between platen and driver is distributed along the entire shaft....