Screen printing method of the hottest paper packag

2022-09-22
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Paper packaging silk printing method

release date: Source: China paper industry

paper packaging mainly refers to cartons, cartons, paper bags, etc. used for commodity packaging, and corrugated cartons, etc. used for transportation packaging. Silk printing has the characteristics of thick ink layer, rich picture and text layers, strong three-dimensional sense, and wide range of printing materials. Its application in high-end tobacco, alcohol and food packaging cartons is gradually increasing. Using UV silk ink to print sanding, refraction, ice flowers, wrinkles and other effects on cigarette boxes has greatly stimulated consumers' desire to buy

characteristics and process arrangement of silk printing

1 Silk printing process arrangement

silk printing is a direct printing method, and there are three process arrangements: ① cardboard → silk printing → post press processing, that is, first, silk is printed on corrugated cardboard or other paperboards, and the decline of yuan coal output in the current month is rapidly expanded from 4.5 percentage points in March to 11 percentage points, and then made into cartons and carton products according to needs; ② Carton → silk printing, that is, silk printing is directly carried out on the produced corrugated carton or other cartons and cartons; ③ Secondary processing, that is, first silk printing is carried out on the surface paperboard, and then corrugated paperboard is made as needed, and then cartons and carton products are made. 2. Features of silk printing ① wide adaptability: silk printing can be large or small; ② Thick ink: in all printing processes, silk printing has the thickest ink layer, high saturation, and better spot color printing effect; ③ Low cost: silk printing is easy to make plates, and the printing process is simple; ④ The quality of printed matter is stable; ⑤ Low production efficiency: the printing speed of silk is slow, which is not suitable for online production; ⑥ Low image accuracy: the resolution of silk printing is not high, and the number of conventional lines is 24 lines/cm - 32 lines/cm

3. Scope of application of silk printing

silk printing is suitable for small batch production, packaging products with high printing appearance requirements, unlimited paperboard thickness and no damage to strength

silk printing process

1 Silk plate making (1) silk selection ① nylon wire: nylon wire has high strength, high wear resistance, high alkali resistance, slightly poor acid resistance, good ink permeability, small diameter of silk thread, good elasticity, and bright impression; ② Polyester yarn: polyester yarn has good stability, high strength, corrosion resistance, better performance than nylon yarn, high tension, suitable for high-precision printing; ③ Stainless steel wire: stainless steel wire has high strength, good stability, small wire diameter, high mesh, good resistance, long service life, poor elasticity, easy to crack under impact, suitable for precision printing, not suitable for curved surface printing; ④ Nickel plated polyester filament: nickel plated polyester filament combines the advantages of polyester filament and stainless steel filament, with wide applicability, moderate price and poor corrosion resistance

silk has plain weave, twill weave, half twist weave and full twist weave. White silk is easy to cause diffuse reflection when exposed, and golden, red and amber absorb ultraviolet rays, which can prevent halo. There are 30 mesh/cm, 40 mesh/cm, 60 mesh/cm, 80 mesh/cm, 120 mesh/cm, 140 mesh/cm and 160 mesh/cm. Generally, the mesh number is large and the straight diameter of the silk is small. Dense filaments, high resolution; The coarse resolution of coarse silk is low. When printing curved surfaces, use elastic silk, such as nylon; When printing absorbent substrate, use silk with large hole area; When printing smooth surface, use high elastic and high tension silk; When printing rough surfaces, use low mesh silk; When printing high-precision printed matter, use silk with low elongation and high tension; When printing signboards, textiles and knitwear, use 28 mesh/cm - 78 mesh/cm silk; When printing paper, metal, glass, leather and plastic, use 40 mesh/cm - 140 mesh/cm silk

(2) taut

silk frame includes wood frame, metal frame, plastic frame, combination frame, etc. When stretching, clean the frame first. Stretching can be done manually, mechanically or pneumatically, and then bond and repair. Tension shall be appropriate, even and stable, with the same direction, avoiding oblique pulling, and the warp and weft wires shall be parallel to each other

(3) plate making

① direct method: plate cleaning → coating photosensitive glue → plate printing → development → plate revision. This method takes time to apply glue, the film thickness is adjustable, the combination is firm, the printing is resistant, and the pictures and texts are easy to be sawtooth. The density of the material is lower. ② Indirect method: photosensitive diaphragm → plate printing → development → film patch → uncovering film base → plate revision. This method has complex operation, smooth lines, weak film, low printing resistance and constant film thickness. ③ Mixing method: plate cleaning → film coating → plate printing → development → plate revision. This method is easy to operate, with fixed thickness and smooth and firm lines

(4) direct plate making with silk

direct plate making with silk is referred to as CTS (computer to screen). ① Laser ablation direct plate making: first coat the photosensitive glue on the metal wire, burn through the photosensitive layer with the laser, and the holes in the image and text part are transparent. The computer of the prepress system controls the ablation place. This method can only be used for metal. ② Laser exposure direct plate making: first, apply photosensitive glue on the silk, and the computer of the prepress system controls the laser to image on the plate to make the silk plate. This plate making method uses a special photosensitive adhesive, which has a narrow ultraviolet wave range and a high price of laser exposure system. ③ Inkjet imaging system: first apply photosensitive glue on the silk, and the prepress system computer controls the inkjet system to spray the light blocking ink onto the photosensitive layer of the image and text part, and then the ultraviolet ray is fully exposed. The image and text part is not photosensitive, and the photosensitive adhesive is washed off; Any two positive parts of the blank part are divided into photosensitive hardening. This method can use ordinary photosensitive glue without losing the details of the image

2. Silk screen printing brush machine

silk screen printing brush machine includes manual silk printing machine, semi-automatic silk printing machine and full-automatic silk printing machine. There are also silk printing machines such as uncovering type, worktable lifting type, sliding table, roller worktable, arc worktable, curved surface type, roller layout, double roller type, etc., which can be selected according to needs

3. How to install the special wire printing concrete pressure testing machine and what are the operating procedures

① UV imitation metal etching printing UV (ultraviolet) imitation metal etching printing is to print a layer of uneven translucent ink on the substrate with metallic specular gloss, and then cure it through ultraviolet line, producing an effect similar to that of bright metal surface after etching or sanding. Prints are elegant and luxurious, and are used for high-end exquisite packaging. This printing method uses UV curing imitation metal etching ink, the substrate is gold card paper, silver card paper or composite materials, and 70 mesh/cm - 100 mesh/cm wire is used. ② UV wrinkle pattern ink printing UV wrinkle pattern ink printing is to use UV wrinkle ink to print on the surface of the substrate, after UV curing, to form a special wrinkle pattern decorative effect. This printing method uses 40 mesh/cm ~ 60 mesh/cm silk, and the ink film is 20 thick μ—— thirty μ, The effect is better if the thickness is large. ③ Ice flower effect printing ice flower effect printing is to print ice flower ink on the surface of the substrate with metallic luster by silk screen printing. After UV curing, it appears ice flower shape. The substrate of this printing method is gold and silver cardboard, using 60 mesh/cm - 100 mesh/cm silk. ④ Foaming printing foaming printing uses micro sphere foaming ink and silk to print on paper or other substrates. The graphics and texts are raised. It is widely used in book binding, Braille, map, packaging and decoration printing. This printing method uses 30 mesh/cm - 50 mesh/cm silk. Silk can also be used for fragrant ink silk printing, pearlescent ink silk printing, liquid crystal ink silk printing, phosphorescent ink silk printing, fluorescent ink silk printing, crystalline gloss silk printing, etc

high speed rotary silk printing production line

due to the low printing speed, slow ink curing speed, difficult to control printing quality, and high consumption of printing materials of flat press flat silk printing method, it can not meet the needs of cigarette carton scale and batch production. Using high-speed rotary silk printing production line, the printing speed is fast, the productivity is high, the printing quality is stable, and the consumption is low. It changes the traditional flat press flat silk printing, manual paper supply, and ink supply methods, and is suitable for high-speed automatic, large-scale mass production of exquisite folding cartons

the nickel metal round wire printing plate, built-in doctor blade and automatic ink supply system are used for web rotary wire printing. The doctor blade transfers the printing ink from the round wire plate to the substrate surface supported by the embossing cylinder. The whole printing process from paper feeding, ink supply, printing color registration, UV drying, etc. is fully automatically controlled by computer

the round screen printing plate is suitable for large-scale rotary printing, with a maximum speed of 125m/min. the silk can be reused. Therefore, web rotary silk printing can not only meet the requirements of printing special effects such as frosting and ice flower, but also online hot stamping holographic anti-counterfeiting marks, concave convex dental marks, die-cutting indentation, which is easy to realize high-speed automatic printing of cartons

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