In the production process, the extruder sometimes has poor plasticization. What is the reason? The following is a long time to help you answer:
First, scorch
1. The phenomenon of scorching
(1) The temperature reflects super high, or the instrument that controls the temperature fails, causing the plastic to be ultra-high temperature and scorched.
(2) The nozzle of the machine head has a large smoke, a strong irritating odor, and a buzzing sound.
(3) Granular scorch on the surface of the plastic.
(4) There are continuous pores at the joints.
2, the cause of the scorch
(1) The temperature control is super high, causing the plastic to burn.
(2) The screw is used for a long time without cleaning, and the scorch is accumulated and extruded with the plastic.
(3) The heating time is too long, and the plastic deposits are heated for a long time, which causes the plastic to deteriorate and burn.
(4) The parking time is too long, there is no cleaning head and screw, which causes the plastic to decompose and burn.
(5) Multiple mold changes or color changes, causing the plastic to decompose and burn.
(6) The head cover is not pressed, and the plastic is aged and decomposed inside.
(7) The instrument that controls the temperature fails, causing scorch after ultra-high temperature.
3, the method of eliminating burnt
(1) Regularly check if the heating system is normal.
(2) Clean the screw or the machine head regularly and thoroughly clean it.
(3) According to the requirements of the process, the heating time should not be too long. If there is any problem with the heating system, it is necessary to find relevant personnel in time to solve it.
(4) Change the mold or change color in a timely and clean manner to prevent mottling or burnt scorching.
(5) After adjusting the mold, the mold cover should be pressed tightly to prevent the glue from entering.
(6) If the scorch is found, the machine head and the screw should be cleaned immediately.
Second, poor plasticization
1. Poor plasticization
(1) The surface of the plastic layer has a phenomenon of suede.
(2) The temperature control is low, the meter pointer reflects the low temperature, and the actual measurement temperature is also low.
(3) The surface of the plastic is black and has small cracks or small particles that are not plasticized.
(4) The plastic glue is not well stitched, and there is a clear trace.
2, the cause of poor plasticization
(1) The temperature control is too low or the control is not suitable.
(2) There are resin particles which are difficult to plasticize in plastics.
(3) The operation method is improper, the screw and traction speed are too fast, and the plastic does not completely reach plasticization.
(4) The plastic mixing is uneven during granulation or the quality of the plastic itself.
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