Injection Molding
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Unstable cycle in low density polyethylene '2079851475616104452
Problem Phenomenon
The '2079851475616104452 cycle time fluctuates greatly, and the cycle time difference for the same product exceeds ±3s.
Unstable cycles affect production efficiency and product quality consistency, and may cause abnormal robot part removal on automated production lines.
Cause Analysis
(1) Improper cooling time setting, inconsistent cooling degree of products
(2) Unstable demolding; ejection action sometimes delayed
(3) Plasticizing time fluctuation, inconsistent screw retraction time
(4) Large mold temperature fluctuation, changing cooling rate
(5) Unstable equipment action sequence, slow hydraulic system response
Solution
(1) Ensure sufficient and fixed cooling time, use a timer for precise control
(2) Check the ejection system, ensure smooth ejector pin action, add lubricating oil
(3) Stabilize plasticizing parameters; keep screw rotation speed and back pressure settings fixed
(4) Stabilize mold temperature; keep water channel flow stable, control temperature difference within ±2°C (30-60°C range)
(5) Check equipment hydraulic and electrical systems, repair slow-responding valves and sensors
Key Takeaway
Cycle instability is caused by the accumulation of time fluctuations in each process step; cooling, demolding, plasticizing, and equipment systems need to be investigated one by one.
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