1, The die pressure is insufficient. Pressure at the die size is directly affected by the mold compression ratio, particularly the length of the straight section of the die to decide. Die compression ratio is too small or too short can cause the straight segment is not dense products, the impact of physical properties.(3003 aluminIum)
2, unreasonable die-sectional design , especially in distribution and the interface angle of inner ribs treatment. This will cause stress concentration phenomenon exists, and eliminate the need to improve the interface design at the right angle and an acute angle.
Change die pressure on the one hand by changing the length of the straight sections of the die to adjust the flow resistance of the material; on the other hand can choose different compression ratios in the mold design stage to change the extrusion pressure, but must pay attention to the head and compression ratio extruder screw compression ratio to adapt; you can also change the recipe, adjust the extrusion process parameters, increasing the perforated plate to change the size of the melt pressure.(buy aluminum floor plate)
3, for the poor performance due to shunt bars convergence should be increased due to decreased muscle length and the outer surface of the ribs and rib confluence, or increasing the compression ratio to solve.
4, die discharge uneven, resulting in thin wall sections are inconsistent, inconsistent or compactness. This contributed to the difference between the mechanical properties of the profiles on the two faces, sometimes when we test cold-side side qualified unqualified, is precisely to prove this point. As for the thin-walled non-standard profiles there is not more to say.
5, calibrator cooling rate. (aluminum tread plate)Cooling water temperature is often not taken seriously enough, the cooling water is the role of macromolecular chains profile stretched timely cooling setting, to achieve the purpose of use.