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Improper production environment control during metallocene linear low-density polyethylene metallocene linear low-density polyethylene processing (variant: startup commissioning scenario)
Fenómeno del problema
Large workshop temperature and humidity changes cause product quality fluctuations, especially obvious differences in product dimensions and appearance between day and night.
Improper environmental control affects process stability and product consistency.
Especially during new machine commissioning or initial startup, this problem is more prominent and requires focused attention.
Análisis de la causa
(1) Ambient temperature changes affect mold cooling effect and product shrinkage rate
(2) High ambient humidity causes raw material to absorb moisture
(3) The workshop has no air conditioning installed or the air conditioning effect is poor
(4) Morning and evening temperature differences affect cooling water temperature
(5) Airflow (such as opening and closing doors) affects the stability of the blown film cooling line
(6) During new machine commissioning or initial startup, process parameter fluctuations or equipment condition changes aggravate this problem
Solución
(1) Install an air conditioning system in the production workshop, controlling temperature at 20-25°C and humidity ≤60%
(2) Install a constant temperature device in the cooling system to ensure stable cooling water temperature
(3) Control temperature in zones for the injection workshop and the extrusion workshop
(4) Install wind shields in the blown film workshop to isolate external airflow
(5) Establish an environmental parameter recording system and adjust process parameters in time
(6) And do a good job of parameter recording and archiving; pay special attention to parameter stability during new machine commissioning or initial startup
Conclusión clave
The production environment is an important factor affecting processing quality; a complete environmental control system needs to be established.
In different production scenarios, targeted preventive measures need to be taken.
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