Design the spool based on the specification

1. Required specification of wire size, winding weight etc.
2. Specify the groove detail, hole for start and end.
3. Decide the spool material like ABS, PS and PP.

Manufacturer of spool mould make their own design for spool mould

1. Check thickness and shape of spool for cooling water circulation
2. Depending on the material, decide shrink factor on their experience.
3. Since the shrink rate is different, the spool with different material get different dimension.
4. With built mould, extrude sample spool for test.
5. Record extrusion condition.

Inspect the spool samples

1. Check shape and dimension and also flange straightness.
2. Cut the part of layer groove and polish for the microscope picture.
3. Scaling the picture of groove by CAD software and measure the groove distance and last lap distance.
4. If not passed inspection, let maker do repair work and new samples for inspection.
5. In case inspection passed, do the winding test at the winding machine with experienced operator.
6. With operator's opinion, get samples with modified extrusion specification like cooling time and total cycle time.
7. Issue Pass certification and check the extrusion condition from time to time.