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# System prepended metadata

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1-  Check the cooling system of your extrusion line, i.e. the speed into the cooling bath must be larger or equal to the end of line speed, i.e. V2 > = Vend, pages 11, 33. Doing so you ensure that you have no stretch past the shrinkage area of the extrusion line.

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2- Check that the line speed at the end of the shrinkage conveyor, V1 is larger or equal to V2, see page 11. This will ensure that the total line is not pulling and that the loop between shrinkage conveyor and weighing table is not too deep and regulation is working.
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3- Check that the material on the take away roll (page 9: pulled roll) has no slippage, i.e. material speed is +-2% relative to the surface speed of the take away roll. Take care that the shrinkage conveyor has at least 10% speed decrease, page 38. 

4- All the aforementioned speeds should be measured by tachymeter, don’t take simply the numbers displayed on the control monitor. This to avoid an “invisible pull” though the line (invisible on the monitor).
- are tachometers available on the line? where?



5- Having adjusted all the areas from step 1 - 3 turn off the RMEA, reduce the line take away speed until the material develops ripples which disappear up to the end of the shrinkage conveyor, see page 17, 53. Then you have the best set up of the line for the “relaxed extrusion”.
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6- Keep this parameters, take tread samples past cutting and check the green tread profile (GTP) actual versus spec. If not within tolerance for the cross section adjust the die, not the line setting.
- this should have been done before, the die is out of the UC?

7- When new die is in use measure the residual shrinkage again. Compare also the areas of the die relative to the GTP from actual sample.


## Questions:

- What are the setting the AI should propose?
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