Injection Molding
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Unstable mold temperature control in general-purpose polyethylene '2079851475616104452
Problem Phenomenon
The mold temperature fluctuates greatly during production, and the temperature difference between the mold cavities is obvious.
Unstable mold temperature leads to product dimensional fluctuation, warpage deformation, and inconsistent appearance, affecting product quality and production efficiency.
Cause Analysis
（1）The mold temperature controller power is insufficient or the water flow is not enough
（2）The mold cooling water channel design is unreasonable, and the cooling of each part is uneven
（3）The cooling water quality is poor, and the water channel is scaled and blocked, and the flow rate decreases
（4）The ambient temperature change affects the mold temperature control accuracy
（5）The cooling time is improperly set, and the mold temperature has not reached an equilibrium state
Solution
（1）Select a mold temperature controller with sufficient power to ensure that the mold temperature is stable within the range of 30-80°C
（2）Optimize the mold cooling water channels to ensure uniform cooling of each mold cavity, and arrange the pipelines symmetrically
（3）Regularly clean the cooling water channels, use soft water or add anti-scaling agents
（4）Install air conditioning in the production environment and control the room temperature at 20-25°C
（5）Fully preheat the mold after startup, and formally produce after 10-20 mold cycles
Key Takeaway
Unstable mold temperature is caused by improper cooling system design or maintenance, and needs to be solved from the mold temperature controller, water channel design, and maintenance.
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