Screen printing is a flexible, low-cost, and high-quality printing process with broad application prospects and market demand. Before proceeding with screen printing, it is essential to pay attention to the following details to ensure a smooth production process and product quality:
Environmental Preparation
Purity Level:
Cleanliness in printing facilities is crucial, especially in printing and plate-making workshops, as dust in the air can affect print quality. For workshops with high precision printing requirements, it is necessary to install air purification equipment when needed to maintain environmental cleanliness.
Humidity and Temperature Control:
Large temperature and humidity fluctuations significantly affect printing accuracy, especially in multi-color offset printing. Therefore, it is essential to maintain relatively stable indoor humidity and temperature and adjust them appropriately according to the seasons to ensure the precision of printed dimensions.
Material Selection and Preparation
Printing Material Understanding:
With technological advancements, there is a wide variety of printing materials available, each with different shapes. Before printing, it is essential to select the appropriate inks, solvents, and blades based on the product's material and purpose. For instance, metals can be treated with sandblasting or electroplating methods, while plastics require chemical processing.
Silk Screen and Mesh Frames
Select the appropriate mesh type, count, wire diameter, open area, elongation, weaving method, and color. Additionally, the frame material, size, and strength must also be chosen according to specific requirements.
Scraper and Photo-Sensitive Materials:
The material, width, hardness, scraping angle, blade condition, and mesh distance of the scraper are all very important. The scraper should be made of suitable materials like polyester rubber, and adjusted to the appropriate hardness and scraping angle. The choice of photo-sensitive material also needs to consider its sensitivity, resolution, adhesiveness, elongation, hardness, water resistance, solvent resistance, and abrasion resistance.
Section III: Plate Making and Exposure
Printing Details:
Pay close attention to tension control during plate-making, mesh tension angle selection, bonding methods of the frame and mesh, as well as the mixing time of the sensitizing agent. Ensure every detail in the plate-making process meets specifications to enhance the quality of the plates.
Proofing Control:
During the baking process, control the type of light source, exposure time, and distance of the light source. Ensure the film plate is in close contact with the emulsion to prevent underexposure or overexposure.
Four: Pre-production Inspection
New Website Edition Inspection:
Inspect the new web plate for any issues such as broken lines or jagged edges to ensure the quality of the plate.
Mold and Product Inspection:
Inspect fixtures and products for gaps and loose parts to ensure stability during the printing process.
Font and Pattern Inspection:
Inspect for issues such as font weight, line breaks, and ghosting to ensure the clarity of the printed pattern.
Surface Treatment
Prior to screen printing, it is typically necessary to clean and degrease the products to ensure a clean, debris-free surface. Different materials require different treatment methods, such as sandblasting and electroplating for metals, and chemical treatment for plastics. Surface treatment is a crucial step in the screen printing process, directly impacting the print quality and product standards.
Section VI: Other Considerations
When mounting the screen, make sure there is a proper gap between the screen and the product to prevent poor contact during the printing process.
During the silk screen processing, it is necessary to regularly remove dust and debris from the product surface, and consider employing static measures to reduce dust adhesion.
