Solid stating

Details Solid stating Solid stating

1981-09-04

1983-07-12

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Means applying electrical or wave energy directly to work

Electro-static or inductive field

422138, 422186, 425203, B29B 300

Patent

active

043928048

ABSTRACT:
This relates to the increasing of the intrinsic viscosity of resins, particularly PET, by effecting a solid state polymerization of the resin. More particularly, the solid stating is effected in conjunction with an injection or extrusion unit wherein after having the IV of the resin increased, the heated resin may be fed dry into an injection unit thereby utilizing the heat of the heated resin to reduce heating cost. The solid state polymerization is effected by heating the resin in the presence of either a vacuum or an inert gas such as nitrogen.

REFERENCES:
patent: 2695427 (1954-11-01), Sarge et al.
patent: 2966469 (1960-12-01), Smythe et al.
patent: 3253303 (1966-05-01), Bradt
patent: 3410938 (1968-11-01), Schippers

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