Preparation of the extrusion

1

Install the 90 mm die and the 82 mm punch in the extruder barrel.

2

Set the temperatures of the twin screw extruder in the order 175˚C, 175˚C, 175˚C, 185˚C, 185˚C, 185˚C; 190˚C, 190˚C, representing respectively the temperatures of the preheating, degassing, heating, and shaping chambers of the machine.

3

Turn on the electrical control box of the machine’s heating system.

4

Allow to heat for the time necessary to allow the resin that could not be emptied to melt and free the screws.

5

Turn on the electric control box of the machine’s screw system.

6

Let it run for the time necessary to completely release the screws from the sleeve.

7

Place the mixing powders in the order F0, F4.01, F12.54, F23.03, F32.01, F38.01, F51.02 near the extruder.

8

Make a vacuum pass (to make the sleeve completely empty and clean).

Extrusion itself

(step 1)

1

Load the F0 mixture and check the degassing (Pour the F0 mixture powder into the inlet hopper of the extruder.

2

Definitely adjust the sizer, the cooler.

3

Finally set the fencer.

4

Final adjustment of the chainsaw;

5

Let the extrusion of the F0 tubes follow its normal course.

6

Make sure that the F0 mixture is completely finished in the hopper (Just a small amount of F0 powder is seen before pouring the next mixture to avoid air ingress).

Extrusion itself

(step 2)

1

Load the mixture F4.01 and check the degassing as you go along.

2

Let the extrusion of the F4.01 tubes follow its normal course.

3

Ensure that the F4.01 mixture is completely finished in the hopper.

Extrusion itself

(step 3)

1

Load the mixture F12.54 and check the degassing as you go.

2

Let the extrusion of the F12.54 tubes follow its normal course.

3

Ensure that the F12.54 mixture is completely finished in the hopper.

Proceed in the same way until the end of the extrusion (steps 4, 5, 6, 7) of formulations F23.03, F32.01, F38.01, F51.02 respectively.

Pass the tubes to quality control by the company’s standards team.

Move on to packaging and storage.

Transport to the ENSP metallurgy laboratories (for analysis and characterization).