Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1985-06-28
1987-07-07
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
294011, 52DIG9, 264 37, 264512, 264535, 264572, 264DIG69, 425DIG41, 425DIG46, H05B 600, B29B 1700, B29C 4900
Patent
active
046786171
ABSTRACT:
Disclosed herein are a method and apparatus for converting an expended, hollow article of thermoplastic material, the article having opposite end walls, an opening in one of the end walls and an annular wall extending between the opposite end walls establishing an original configuration, into a new article of a new configuration. Specifically, the expended article is a two-liter soda bottle and the new article is a building block. The method comprises the steps of heating the expended article to a temperature above the softening temperature of the thermoplastic material, applying forming forces inwardly against the article while the temperature of the article is above the softening temperature so as to change the configuration from the original configuration to the new configuration, and introducing air under pressure into the article through the opening to create and maintain an elevated air pressure within the article while the forming forces are being applied, to urge the walls of the article outwardly against the forming forces. The method includes the further step of cooling the article to a temperature below the softening temperature after the new configuration is achieved and before cessation of the application of forming forces. The apparatus includes two mold members defining a mold cavity of the new configuration and movable between an open position and a closed position. One of the mold members has a passage for alternately carrying a heating medium for heating the mold cavity and a cooling medium for cooling the cavity.
REFERENCES:
patent: 1746869 (1930-02-01), Rosenthal
patent: 3224239 (1965-12-01), Hansson
patent: 3843005 (1974-10-01), Uhlig
patent: 3892829 (1975-07-01), Uhlig
Marpac Industries, Inc.
McCarthy Neil Michael
Silbaugh Jan H.
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