One. Screen printing process arrangement

Screen printing is a direct printing method. There are three process arrangements: ①Cardboard→screen printing→post-printing processing, that is, screen printing on corrugated cardboard or other cardboard first, and then make carton and carton products as needed; ② Carton → screen printing, that is, screen printing directly on the already made corrugated cardboard box or other cartons or cartons; ③Secondary processing, that is, screen printing on the surface cardboard first, and then make corrugated cardboard as needed , And then made into cartons and cartons.

Two. Screen printing features ①Wide adaptability: The screen printing format can be large or small; ②The ink color is thick: among all printing processes, the screen printing ink layer is the thickest, the saturation is high, and the spot color printing effect is better; ③Low cost ：Silk-screen printing is easy to make a plate and the printing process is simple; ④The printing quality is stable; ⑤The production efficiency is low: the screen printing speed is slow, not suitable for online production; ⑥The image precision is low: the screen printing resolution is not high, and the conventional screen number is 24 Lines/cm ~ 32 lines/cm.

Three. Screen printing application scope

Screen printing is suitable for small batch production, packaging products that require high printing appearance, unlimited cardboard thickness, and do not damage the strength.

Four. Screen printing process

1. Screen plate production (1) Screen selection ①Nylon screen: Nylon screen has high strength, high abrasion resistance, high alkali resistance, slightly acid resistance, good ink permeability, and small diameter of wire. Good elasticity and bright imprints; ②Polyester screen: polyester screen has good stability, high strength, corrosion resistance, performance is better than nylon screen, high tension, suitable for high-precision printing; ③Stainless steel screen: stainless steel screen strength High, good stability, small diameter, high mesh, good resistance, long life, poor elasticity, easily broken by impact, suitable for precision printing, not suitable for curved printing; ④Nickel-plated polyester screen: nickel-plated polyester silk The net combines the strengths of polyester wire mesh and stainless steel wire mesh, with wide applicability, moderate price, and poor corrosion resistance.

The wire mesh has plain weave, twill weave, half twist weave and full twist weave. The white screen is easy to cause diffuse reflection when exposed, and the golden, red, and amber colors absorb ultraviolet rays and can prevent halo. The number of screen meshes is 30 meshes/cm, 40 meshes/cm, 60 meshes/cm, 80 meshes/cm, 120 meshes/cm, 140 meshes/cm and 160 meshes/cm. Generally, the meshes The number is large, the mesh is straight and small. Fine wire dense mesh, high resolution; thick wire coarse mesh, low resolution. When printing curved surfaces, use a flexible screen, such as nylon mesh; when printing large absorbent substrates, use a screen with a large mesh area; when printing a smooth surface, use a high-elasticity, high-tension screen; printing on a rough surface When printing, use a low-mesh screen; when printing high-precision prints, use a low-elongation, high-tension screen; when printing signs, textiles, and knitwear, use a 28 mesh/cm～78 mesh/cm screen; printing For paper, metal, glass, leather, plastic, use 40 mesh/cm ~ 140 mesh/cm screen.

2. Stretching the net

There are wooden frames, metal frames, plastic frames, combo frames, etc. for screen frames. When stretching the net, clean the frame first, and the net can be stretched manually or mechanically.