Extrusion & Post
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Ovality of Polypropylene Pipe Exceeding the Standard
Fenómeno do problema
The cross-section of the pipe is not round, and the ovality exceeds the tolerance.
Excessive ovality affects the connection and installation of the pipe, and may cause leakage in socket connections and mechanical connections.
Análise das causas
(1) The cooling is uneven, and the shrinkage of the pipe in all directions is inconsistent
(2) The sizing sleeve is worn or installed incorrectly
(3) The clamping force of the haul-off machine is too large, causing the pipe to deform
(4) The pipes are stacked improperly, producing deformation
(5) The cooling water temperature is too high, causing the pipe to soften and deform
Solução
(1) Check the cooling system to ensure uniform cooling of the pipe in all directions
(2) Check the sizing sleeve, replace it if worn, and ensure concentric installation
(3) Adjust the clamping force of the haul-off machine to avoid being too large
(4) Use special storage racks for pipes to avoid stacking deformation
(5) Control the cooling water temperature at 15-25°C
Conclusão principal
Excessive ovality is caused by uneven cooling or external force deformation, and needs to be solved from cooling uniformity and pipe storage.
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