US PATENT SUBCLASS 264 / 210.7-- .~.~.~ Plural stretching steps or stages

US PATENT SUBCLASS 264 / 210.7
.~.~.~ Plural stretching steps or stages

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

165	DF	FORMING CONTINUOUS OR INDEFINITE LENGTH WORK {8}
176.1	DF	.~ Shaping by extrusion {11}
210.1	DF	.~.~ And reshaping {6}
210.7		.~.~.~ Plural stretching steps or stages

DEFINITION

Classification: 264/210.7

Plural stretching steps or stages:

(under subclass 210.1) Process wherein an extruded workpiece is subjected to stretching by tension in more than one stage.

(1) Note. Some criteria for determining when stretching occurs in more than one stage are the following: (a) The interposition of a nonstretching step, such as heating or shrinking between stretching steps, during which step no stretching occurs. (b) An abrupt change of stretching conditions, such as the tension force.

SEE OR SEARCH THIS CLASS, SUBCLASS:

138+, for a process wherein the stretching is followed by removal of part of the workpiece.