What causes the phenomenon of easy breakage when producing PVC sheets? How can it be solved?

What causes the phenomenon of easy breakage when producing PVC sheets? How can it be solved?

The main reasons are: 
① The extrusion temperature is too low. 
② The incorrect method of adding ingredients makes it difficult for the melt to gel. 
③ The pressure at the head of the machine is too low or the screw speed is too slow, resulting in insufficient mixing of the material. 
The main solutions are as follows: 
①Strictly control the temperature of the extruder. Generally, the temperatures of the feeding section, plasticizing section and homogenizing section of the extruder should gradually increase in a gradient manner. The temperature can usually be controlled in three sections and four zones, with the range being: Zone 1: 140 - 145℃, Zone 2: 150 - 160℃, Zone 3: 165 - 175℃, Zone 4: 180 - 190℃. 
② The batching process should be inspected to ensure strict compliance with the batching process regulations. In particular, the sequence of adding materials must not be reversed. Also, it should be checked whether processing aids and lubricants have been omitted. 
③ Appropriately increase the screw speed and the pressure at the head to enhance the mixing and plasticizing degree of the material.
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