Movable clamp orienter for draw tape
AssigneeMobil Oil Corporation
InventorFox J. Herrington
Life of this patent
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Abstract
A thermoplastic draw tape having thick and wide end portions with a relatively thin and narrow central portion between them is produced by movable clamps which stretch the tape between stationary clamps to produce the stretched, oriented portions of the tape. A plurality of movable clamps and a plurality of stationary clamps produce a plurality of stretched central portions so that the stretching time can be greater than the cycle time of bag making machinery with which the stretching apparatus is synchronized.
Claims10
Apparatus for forming a thermoplastic draw tape having thick and wide end portions with a relatively thin and narrow central portion between said end portions, comprising:
- means for feeding thermoplastic tape along a path of travel;
- a pair of stationary clamps spaced along the path of travel of the thermoplastic tape for clamping the tape;
- a movable clamp positioned along the path of travel of the thermoplastic tape intermediate said pair of stationary clamps for clamping the tape, each of said clamps having a clamping length equal to the length of unstretched end portions to be formed in the thermoplastic draw tape;
- and
- means for stretching the thermoplastic tape between the unstretched end portions by moving said movable clamp away from said stationary clamps to produce said relatively thin and narrow central portions in the thermoplastic draw tape between the unstretched end portions.
Dependencies are inferred from the claim text.