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
1996-03-08
1998-04-07
Woo, Jay H.
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
264267, 264275, 264279, 425112, 425116, 4251291, 425468, 425577, 425DIG218, B29C 4514
Patent
active
057360910
ABSTRACT:
A method of making a composite tube utilizing known equipment and process to form spaced end sections and a central section having an inner corrugated portion and surrounding portion bonded to at least certain crests of the corrugations. A spaced pair of generally cylindrical end couplings are formed by sequentially telescoping the end sections over an internal cylindrically contoured die part and continuing the telescoping until an inner surface of the telescoped end section engages at least three circumferentially spaced fingers to locate the telescoped end section in concentric relationship with the core part. Positioning an external die part in spaced concentric relationship around the telescoped end section, the external die part having an inner surface contoured to the desired external configuration of a coupling being formed. Injecting a heat softened thermoplastic material into the space between the die inner surface and the core to form a coupling. As the thermoplastic material is injected it is maintained at a sufficiently elevated temperature to effect a bonding between the coupling and the telescoped end section.
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Mears Lawrence N.
Scarazzo Christopher
Leyson Joseph
OEM/Miller Corporation
Woo Jay H.
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