The operation process of the fully automatic oval printing machine needs to be combined with the automation characteristics of the equipment and the process requirements. The following are the standardized operation steps and precautions:
1. Preparation before operation
Equipment inspection
Confirm that there are no abnormalities in the various components of the printing machine (conveying device, printing unit, drying device, etc.), and the safety protection devices are intact.
Check that the air source and power supply are stable, the air pressure is not less than 0.6MPa, and the voltage meets the equipment requirements.
Material preparation
Prepare corresponding screens, screen printing silicone, color paste, curing agent and other materials according to order requirements.
Silicone needs to be mixed in proportion (such as ordinary type 100:2, enhanced type 100:3), and the amount of color paste added should not exceed 5%.
Tooling debugging
Adjust the screen tension to 20-25N/cm, the scraper angle 45°-60°, and the pressure is set according to the thickness of the fabric.
Calibrate the printing plate and the screen position to ensure that the positioning accuracy is ≤0.1mm.
2. Loading operation
Automatic loading
Start the automatic pick-and-place device and place the products to be printed on the printing plate one by one.
Ensure that the product is flat and wrinkle-free, and the positioning is accurate.
Manual assistance
For special products (such as special-shaped parts), manual assistance is required for positioning.
3. Printing process
Printing steps
The printing platen enters the automatic printing unit with the conveying device, and the screen frame descends and presses against the product.
The scraper reciprocates along the printing arm, and the first scraper and the second scraper alternately scrape the silicone in the screen frame to complete the printing.
Drying and curing
After completing one printing, the platen enters the drying device, and the temperature is controlled at 120-180℃ (adjusted according to the type of silicone).
The drying time is 1-3 minutes to ensure that the silicone is completely cured.
Layered printing
Multiple printings need to be performed alternately at least 3 times, and each printing is dried to avoid excessive dye thickness.
The drying temperature rises gradually, and the temperature rise is controlled at 3-5℃ each time.
4. Unloading and finishing
Automatic unloading
After printing is completed, the automatic pick-and-place device removes the product from the platen and places it in the unloading station.
Equipment cleaning
Turn off the power of the equipment, clean the screen, scraper and conveying device to avoid clogging by silicone residue.
Check the wear of the equipment and replace the wearing parts in time.
5. Quality control and abnormal handling
Quality inspection
Check the integrity, adhesion and washability of the printed pattern.
Post-curing test: Scratch the surface of the silicone lightly with your fingernails. If there is no shedding or cracking, it is qualified.
Abnormal handling
Screen blockage: Clean with a special cleaning agent to avoid corrosion of the equipment.
Silicone curing abnormality: Check the curing agent ratio, baking temperature and time.
6. Safety precautions
Personal protection
Operators need to wear gas masks and gloves to avoid silicone contact with the skin or inhalation of volatile substances.
Equipment safety
Regularly check the oven, motor and other equipment to prevent hidden dangers such as leakage and overheating.
Environmental compliance
Ensure that the silicone and treatment agent meet environmental standards (such as ROHS, REACH).
7. Key parameter reference
Screen parameters: mesh 80-120 mesh, tension 20-25N/cm.
Scraper parameters: angle 45°-60°, pressure adjusted according to fabric thickness.
Baking parameters: temperature 120-180℃, time 1-3 minutes.
Through standardized operating procedures, the production efficiency and product quality of the fully automatic oval printing machine can be effectively improved, and the defective rate can be reduced.