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Failure Case (Brief): Zhejiang Liming – Push Plate Feeding Failure for Sticky Thin Sheets

Customer & Material

Customer: Zhejiang Liming
Material: Thin metal sheets with an oily/sticky surface (sheets readily stick to one another)

 

Problem Description

A push plate feeding system was adopted, consisting of a sheet pusher plus a return screening plate at the end of the linear feeder.
Due to the sticky surface, the push plate could not effectively separate the sheets:

When the push plate retracted, stuck-together sheets were pulled back into the hopper, resulting in empty strokes.

The sticky residue gradually accumulated in the push plate gaps and clogged the screening holes.

 

Result

The system required cleaning every 2 hours, making it slower than manual feeding.

Sheets became deformed, and eventually the motor overloaded and burned out.

 

Customer Feedback

We wanted to improve efficiency, but everything stuck to the machine – it was completely unusable.

 

Direct Losses

Approximately 3,500 sheets were scrapped, representing a material loss of over 10,000 RMB.

Motor repair plus production downtime caused a 2-week project delay.

 

Lessons Learned

Push plate feeding is unsuitable for sticky thin sheet materials – it works only for dry, non-sticky, long-rod type parts.

For oily/sticky materials, alternative methods such as pneumatic separation, PTFE coating, or ultrasonic vibration must be used, and physical sample testing should always be conducted beforehand.

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