7 steps for optimal purging

1. Preparation

Check your machine parameters and ensure free access of purge mix into the machine hopper. 

The hopper should be free of loaders, driers and the like, to allow the purge mix to be fed directly onto the screw


2. Setting of purging temperature

Set purging temperature according to the specific type of plastic (approx. 10 - 20 % below Purging normal processing temperature, (see chart „Temperatures / Proportions”).

3. Preparation of the purging mix

  • Always shake CORATEX bottle well before use!
  • Pour 2 to 4 % of CORATEX into the plastic granules and stir or tumble well to obtain the purging mix (see chart “Temperatures/Proportions“). 

Note: Do not overdose CORATEX; overdosing leads to feed problems (bridging!).


4. Purging

  • Check whether set purging temperatures have been reached
  • Reduce screw revolutions by approx. 50 %, if possible
  • Run the prepared purging mix through the plastics processing machine and through the    connected nozzles or tooling, if left on the machine. (Quantity: see chart „Quantity required of purging mix“)
  • If necessary, correct the temperature in the screw area so that the mass comes out slightly flaky at the end.

5. Flushing

  • After the cleaning granulate has passed through, pure plastic granulate is reused in the subsequent production process. Quantity: approx. 30 % of the cleaning granulate quantity.

6. Control

  • Check the cleaning result. If there is still dirt, clean again with CORATEX (steps 2 - 5).

Note: If there is still contamination after the second cleaning cycle with CORATEX, we recommend cleaning the machine manually.

7. On completion

  • Set all temperatures according to the plastic granulate provided below.

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