Method and apparatus for infrared heating of plastic preforms

Details Method and apparatus for infrared heating of plastic preforms Method and apparatus for infrared heating of plastic preforms

1992-06-26

1993-10-26

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264521, 4251744, 425526, 392407, 392411, 392418, 432 10, 432 31, B29C 3508, B29C 4966

Patent

active

052563413

ABSTRACT:
A core 6 is disposed inside of and spaced from a hollow plastic preform 1 subjected to external infrared radiation 4 including a first wavelength B.sub.1 that is absorbed by and heats the plastic, and a second wavelength B.sub.2 that propagates through the wall 2 of the preform. The propagated radiation 12 is converted into the first wavelength by the surface 7 of the core, and reemitted at 13 back towards the preform to heat its internal surface 8 to a higher temperature than its external surface 10. The preform may be axially rotated with the core stationary to implement uniform angular heating. Alternatively, the core may be irregularly configured and/or surface treated, with both the core and preform rotated in synchronism.

REFERENCES:
patent: 3436524 (1969-04-01), Pauls
patent: 3787170 (1974-01-01), Gilbert
patent: 4044086 (1977-08-01), McChesney et al.
patent: 4315725 (1982-02-01), Yoshino
patent: 5032700 (1991-07-01), Sugiyama et al.

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