1、对于因分流筋汇合不良造成的性能下降应适当增加筋与外表面、筋与筋汇流处的长度，或者增大压缩比来解决，模头压力的改变可以通过改变模头平直段长度来调整流料阻力；在模具设计阶段可选择不同的压缩比来改变挤出压力，但必须注意机头压缩比要与挤出机螺杆的压缩比相适应；还可以通过改变配方，调整挤出工艺参数，增加多孔板来改变熔体压力的大小。
1, the performance is due to shunt reinforcement caused by poor convergence decline should be appropriate to increase the rib and the outer surface, tendon and tendon at the confluence of the length, or increase the compression ratio, die pressure change can be adjusted by changing the flow resistance of the die head straight section length; in the mold design stage can choose different compression ratio the change of extrusion pressure, but must pay attention to and head compression ratio of extruder screw compression ratio to adapt; also by changing the formula, adjusting the extrusion process parameters, increase the porous plate to change the size of the melt pressure.
2、定型模的冷却速率，冷却水温往往没有引起足够的重视，冷却水的作用是将型材拉伸的大分子链及时冷却定型,达到使用目的。
2, the cooling rate of the mold and the cooling water temperature often fail to attract enough attention. The role of cooling water is to cool the profile chain in time and achieve the purpose.

3、口模截面设计不合理，尤其是内筋的分布和交界面角度的处理，这样会造成应力集中现象存在，需要改进设计和消除交界面处的直角和锐角。
3, the section design of the die is unreasonable, especially the treatment of the distribution of the inner reinforcement and the angle of the interface. This will cause the phenomenon of stress concentration. We need to improve the design and eliminate the right angle and sharp angle at the interface.
4、口模出料不均匀，造成型材壁厚薄不一致，或者密实度不一致。这也就造成了型材两个面之间的力学性能上的差别，至于壁薄等非标型材这里就不再多说。
4, the die material is not uniform, resulting in the uneven thickness of the wall, or the inconsistency of the density. This also causes the difference between the mechanical properties between the two surfaces of the profile. As for the non - standard sections, such as wall thin, there is no more to be said.
5、模头压力不足，模头处压力大小是直接受模具的压缩比，特别是模具平直段的长度来决定的。模头的压缩比太小或平直段太短都会造成制品不致密，影响物理性能。
5, the pressure of the die head is insufficient and the pressure of the die head is directly determined by the compression ratio of the die, especially the length of the die flat section. The compression ratio of the die head is too small or the straight section is too short will cause the products to be not dense and affect the physical properties.
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