Production of shaped, high polymeric articles

Claim 2

In a method of mixing natural thermoplastic, high polymer material and a coloring agent in yarn producing equipment, in which are provided hopper means for receiving the material and the agent and in which is formed a mixture thereof, feed means for continuously delivering the agent to the hopper means and including means for measuring doses of the agent for delivery thereof to the hopper at intervals, means for extruding the mixture and a spinneret, means for drawing the mixture from the hopper through the extruder, and metering pump means for delivering the throughput of the extruder to the spinneret to form yarns; the improvement comprising applying a first control signal to the metering pump means, deriving a second control signal from the first signal, which is proportional to the first signal, applying the second control signal to the means for measuring the doses of the agent for delivery thereof at intervals to the hopper to thereby regulate the interval between delivery of measured doses of the coloring agent to maintain predetermined portions of said material and coloring agent in the mixture in proportion to the output of the extruder.

Claim 3

The method of claim 1 further including driving said metering pump means by a first motor, there being a first electrically controlled clutch means disposed between said first motor and said pump, deriving said first control signal from a master control through the intermediary of first voltage divider means, applying said first control signal to said first clutch means, there being a first tachometer associated with said pump, generating a signal by said tachometer and applying the thus generated signal to said electrically controlled clutch means in a feed-back loop circuit, said feed means for delivering said agent to said hopper including a second motor for driving said means for measuring doses of the agent, a second electrically controlled clutch means disposed between said second motor and said agent dose measuring means, deriving said second control signal from said first control signal through the intermediary of second voltage divider means, applying said second control signal to said second clutch means, there being a second tachometer associated with said agent dose measuring means, and generating a signal by said second tachometer and applying the thus generated signal to said second electrically controlled clutch means in a feed-back loop circuit to thereby regulate the agent dose measuring means.