US PATENT SUBCLASS 264 / 235.6
.~.~.~ After stretching running or indefinite length work

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

232  DF  DISPARATE TREATMENT OF ARTICLE SUBSEQUENT TO WORKING, MOLDING, OR SHAPING {2}
234  DF  .~ Effecting temperature change {3}
235  DF  .~.~ Annealing {1}
235.6.~.~.~ After stretching running or indefinite length work {1}
235.8  DF  .~.~.~.~> Biaxial stretching of film

DEFINITION

Classification: 264/235.6

After stretching running or indefinite length work:

(under subclass 235) Process wherein the annealing is performed upon stretched work of indefinite length or work which moves through the treatment zone as it is being treated.

(1) Note. The purpose of the treatment usually is to "heat set" the crystalline orientation produced by the stretching operation.

(2) Note. The treatment is carried out at a tension (or lack of tension) different from the tension which causes the stretching; when performed at the same tension, the treatment is considered to be treatment "within the mold" and is classified with the stretching treatment.

(3) Note. Shrinking is considered a shape change; heat treatment to shrink is not classified here; see subclass 289.6.

SEE OR SEARCH THIS CLASS, SUBCLASS:

181, 198 and 210.1+, for extrusion and stretching whether or not followed by heat treatment.

288.4+, and 291+, for stretching processes, per se.