Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1973-11-19
1979-02-13
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264274, 264275, 264279, 264331, 264DIG60, 251305, B29C 500, B29C 512, B29D 300, B29D 900
Patent
active
041395905
ABSTRACT:
A flow control device such as a valve, damper and the like for controlling flow through a duct or other flow passage and including a relatively rigid main body portion composed primarily of a first organic resin material and a sealing portion bonded to the main body portion and composed of an elastomeric material including a second organic resin. The bond between the sealing portion and main body portion is increased by mixing some of the second organic resin material with the first organic resin material. Mounting means in the form of a pivot rod is molded to the main body portion for pivotally supporting the device in a duct or the like. The device can be made by a method including steps of mixing the second organic resin in powdered form into a quantity of the first organic resin in liquid form and then pouring the mixture into a portion of a mold defining the configuration of the main body portion. Elastomeric material for the sealing portion is poured into the mold in liquid form and covers the surface of the mixture of the first organic resin and the powdered form of the second organic resin. The contents of the mold is then cured.
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