The gold and silver cardboard printing process is to use the basic principle of the screen printing plate part of the mesh to penetrate the ink, and the non-image part of the mesh is not transparent.
　　 Gold and silver card paper screen printing consists of five major elements, namely screen printing plates, squeegee blades, inks, printing tables and substrates. The basic principle of screen printing is to use the basic principle of the screen printing part of the mesh to penetrate the ink, the non-image part of the mesh is not transparent to the printing. The ink is poured on one end of the screen printing plate during printing, and a certain pressure is applied to the ink portion on the screen printing plate by the squeegee blade while moving toward the other end of the screen printing plate. The ink is squeezed from the mesh of the graphic portion onto the substrate by the squeegee during movement. Due to the viscous action of the ink, the print is fixed within a certain range. During the printing process, the squeegee is always in line contact with the screen printing plate and the substrate, and the contact line moves with the movement of the squeegee due to the screen printing plate and the substrate. A certain gap is maintained between them, so that the screen printing plate at the time of printing generates a reaction force against the squeegee by its own tension, and this reaction force is called a resilience force. Due to the resilience, the screen printing plate and the substrate are only in a moving line contact, and the other portions of the screen printing plate are separated from the substrate. The ink and the screen are broken and the printing is ensured to ensure the dimensional accuracy and avoid the dirty substrate. When the squeegee scrapes across the entire layout, it is lifted, and the screen plate is lifted, and the ink is gently scraped back to the original position. This is a printing trip.
　　 Screen printing features and process arrangements
　　 1. Screen printing process arrangement
　　 Screen printing is a direct printing method, and there are three kinds of process arrangements: 1 cardboard → screen printing → post-press processing, that is, first screen printing on corrugated cardboard or other cardboard, and then into a carton or carton product according to needs; 2 Carton→screen printing, that is, screen printing directly on corrugated boxes or other cartons and cartons that have been made; 3 secondary processing, that is, first screen printing on the faceboard, then making corrugated cardboard as needed , and then into a carton, carton products. 2. Screen printing features 1 Wide adaptability: The screen printing format can be large or small; 2 The ink color is thick: In all printing processes, the screen printing ink layer is thickest, the saturation is high, and the spot color printing effect is better; 3 Low cost: screen printing and plate making is easy, printing process is simple; 4 print quality is stable; 5 low production efficiency: screen printing speed is slow, not suitable for online production; 6 image accuracy is low: screen printing resolution is not high, conventional screen line Number 24 lines / cm ~ 32 lines / cm.
　　 3. Screen printing scope
　　 Screen printing is suitable for small-volume production, packaging products with high requirements on printing appearance, unlimited thickness of cardboard, and no damage to strength.
　　 Screen printing process
　　 1. Screen printing (1) Screen selection 1 Nylon screen: Nylon screen has high strength, high abrasion resistance, high alkali resistance, poor acid resistance, good ink permeability and small wire diameter. Good elasticity and vivid imprinting; 2 Polyester mesh: Polyester mesh has good stability, high strength, corrosion resistance, better performance than nylon mesh, high tensile tension, suitable for high-precision printing; 3 stainless steel mesh: stainless steel mesh strength High, good stability, small wire diameter, high mesh, good resistance, long life, poor elasticity, easy to break by impact, suitable for precision printing, not suitable for curved printing; 4 nickel-plated polyester mesh: nickel-plated polyester yarn The net combines the strengths of polyester mesh and stainless steel wire mesh for wide applicability, moderate price and poor corrosion resistance.
　　 The screen has plain weave, twill weave, half twist weave, and full weave. When the white screen is exposed, it is easy to cause diffuse reflection, and the golden, red and amber colors absorb ultraviolet rays, which can prevent halo. The number of mesh meshes is 30 mesh / cm, 40 mesh / cm, 60 mesh / cm, 80 mesh / cm, 120 mesh / cm, 140 mesh / cm and 160 mesh / cm, etc., in general, mesh The number is large, and the wire is straight. Filament dense mesh, high resolution; coarse coarse mesh resolution is low. When printing curved surfaces, use a large elastic mesh, such as nylon mesh; when printing large substrates, use a mesh with a large mesh area; when printing smooth surfaces, use a high-elastic, high-tension mesh; When using low-mesh screens; when printing high-precision prints, use low-elongation, high-tension screens; when printing signboards, textiles, and knitwear, use 28 mesh/cm to 78 mesh/cm screen; For paper, metal, glass, leather, and plastic, use a mesh of 40 mesh/cm to 140 mesh/cm.