When the aluminum extrusion mold comes out of the oven at high temperature, it must be placed on the support pad within the specified time. Prepare a support pad of appropriate size according to the cross-sectional shape of the mold. If the size of the support pad is too small, it will cause certain damage to the lower mold. The elastic pressure makes the size of the mold unstable, and the surface of the extruded aluminum profile lean tube produces uneven ripples.
2. There are debris on the working belt of the extrusion die.

3. The upper and lower dies of the aluminum extrusion die are not parallel

4. Uneven extrusion speed

5. The size of the mold's empty knife is too small