Processing Machinery
13 مشاهدة
Rough Inner Wall of Polypropylene Extruded Products
ظاهرة المشكلة
The inner wall of the pipe or profile is rough and uneven, with visible streaks or particles.
A rough inner wall affects the fluid resistance and hygiene performance of the pipe, and bacteria may breed in water supply pipes.
تحليل الأسباب
(1) The mandrel temperature is too low, and the melt undergoes stick-slip flow on the mandrel surface
(2) The finish of the mandrel surface is insufficient or worn
(3) The compressed air pressure is insufficient (during internal pressure sizing)
(4) The melt temperature is too low, and the fluidity is poor
(5) The screw plasticization is insufficient, and there are unmelted particles in the melt
الحل
(1) Appropriately increase the mandrel temperature to match the die temperature (range 200-280°C)
(2) Polish the mandrel surface to Ra≤0.2μm, and apply chrome plating when necessary
(3) Check the compressed air system to ensure stable pressure
(4) Appropriately increase the barrel temperature to a reasonable value within the range of 200-280°C
(5) Optimize the screw design and rotation speed to ensure full plasticization
الخلاصة الأساسية
A rough inner wall is caused by low mandrel temperature or poor surface condition, and needs to be solved from temperature control and mold maintenance.
هل كان هذا مفيدًا؟
0 شخص وجدوا هذا مفيدًا
شكرًا لك على ملاحظاتك!