Market and product

1. Necessity of research and application:

• Before 2024, waste products after the plate pasting process on pasting machines usually only recovered the grid panels.
• Lead recovery was performed using manual methods, which affected workers' health.
• Labor productivity for processing waste plates was low.

2. Research and application process:

• To overcome the above limitations, the author researched and manufactured auxiliary equipment to recover lead paste, replacing manual lead recovery work and optimizing raw material recovery for reuse to reduce production costs.
• Recovered dry lead pastes are put into a grinder, crushed into fine powder meeting production standards, and then reused as negative paste.
• Defective waste plates from the pasting process are put into a lead paste separator; the recovered products are panels for lead recovery, while the filtered lead paste is reused as negative paste.
• The manufactured equipment includes:

o Dry paste grinder: Dry pastes from positive plates, dry paste scraped from mixing bowls, etc., are put into the grinder and crushed into small, fine particles meeting technical standards, then used in mixtures for negative paste.
o Rotary lead paste separator: Defective pasted plates are placed in a water tank to soften, then the rotating drum is operated to separate the lead paste from the plates. The lead paste settles in a container to be filtered for use as negative paste, while the recovered plate panels are reused for casting grids and accessories.

Item	Improvement Measures
	Method	Illustration Image
Waste positive plates	Paste is separated from positive plates and panels to recover lead. The lead paste is soaked in water to soften and then put into a grinder to crush it into fine, small particles meeting technological standards. The recovered paste is reused in negative paste mixtures.	Paste grinding system
Waste negative plates	Defective negative plates from the production process are soaked in water to soften, then put into a rotating drum to separate the lead paste. The paste is filtered for reuse in negative paste mixtures, while the grid panels are recovered, reprocessed, and reused for casting grids and accessories.	Paste separation system from waste plates
Paste scraped from mixing bowls	Scraped paste recovered from cleaning bowls and pasting machines is also transferred to the paste grinder for reuse in negative paste mixtures.	Paste grinding system

3. Significance and effectiveness of research and application:

3.1. Significance of research and application:

• The waste rate in the plate pasting stage has decreased below the allowable waste rate.
• Improved working conditions for direct laborers.

3.2. Economic efficiency of research and application:

• Total profit value: ~ 800 million VND/year.