Receptacles – Receptacle having flexible – removable inner liner – Means for venting air trapped between the liner and its...
Patent
1985-04-18
1986-12-02
Price, William
Receptacles
Receptacle having flexible, removable inner liner
Means for venting air trapped between the liner and its...
137583, 141338, 220435, 220461, 220469, 264503, B65D 9004
Patent
active
046258922
ABSTRACT:
A polyolefin lined tank consisting of a rigid polyolefin tank within a metallic tank wherein there is no adherence or bonding between the walls of the inner polyolefin tank and the outer metallic tank, but wherein a maximum of 0.04 inch clearance is obtained between the said walls. The polyolefin tank is formed in the metallic tank by a rotational molding technique wherein a high temperature paint or other suitable release agent is first applied to the inner walls of the metallic tank; the tank is heated; and polyolefin powder is placed in the heated tank. The polyolefin powder melts during rotation of the heated tank to thereby coat the inner walls of the tank; the tank is cooled, resulting in shrinkage of the polyolefin away from the metallic walls; during the cooling cycle, the interior of the lined tank is pressurized to control the shrinkage, resulting in minimum clearance between the outer and inner tanks, and stress relief of the inner polyolefin tank. Fixtures are attached to the flanges of the fittings of the metallic tank to allow the polyolefin to flow through the tank fittings to thereby coat the outer surfaces of the tank flanges.
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"Design of Molded Articles", section on Shrinkage, pp. 287-291 of Plastics Engineering Handbook of the Society of the Plastics Industry, Inc., 3rd Edition, Reinhold Publishing Corp., N.Y., 1960.
Gehman Bryon
Industrial Equipment & Engineering, Inc.
Poly Processing Company, Inc.
Price William
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