Injection Molding
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Unstable cycle of random copolymer polypropylene '2079851475616104452
Problem Phenomenon
2079851475616104452 cycle time fluctuates greatly, with time differences exceeding ±3s between different cycles of the same product.
Unstable cycles affect production efficiency and product quality consistency, and may cause abnormal robot part removal on automated production lines.
Cause Analysis
(1) Cooling time is set improperly, and product cooling degree is inconsistent
(2) Demolding is unstable, and the ejection action is sometimes delayed
(3) Plasticizing time fluctuates, and screw retraction time is inconsistent
(4) Mold temperature fluctuates greatly, and cooling rate changes
(5) Equipment action timing is unstable, and the hydraulic system responds slowly
Solution
(1) Ensure cooling time is sufficient and fixed, using a timer for precise control
(2) Check the ejection system to ensure smooth ejector pin action, and add lubricating oil
(3) Stabilize plasticizing parameters, with screw speed and back pressure settings fixed
(4) Stabilize mold temperature, with stable water channel flow and temperature difference controlled within ±2°C (40-80°C range)
(5) Check the equipment hydraulic and electrical systems, repairing slow-responding valves and sensors
Key Takeaway
Unstable cycles are caused by the accumulation of time fluctuations in various processes; cooling, demolding, plasticizing and equipment systems need to be investigated one by one.
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