Offset Printing for High-Definition Package Graphics

A method to print packaging boxes and other materials with concave and convex textures using offset printing instead of silk screening. The method involves using two-layer superimposed printing with original ink and spot color ink. The total thickness of the two layers is around 8 microns or more to mimic the texture of silk screening. The original ink serves as a base for coloring and avoids color differences. The spot color ink increases the thickness further. This allows achieving similar concave and convex textures without expensive silk screening equipment and materials.

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A method to print tactile inks on packaging boxes using offset flexographic printing to improve efficiency and quality compared to traditional screen or gravure printing. The method involves using offset printing for the base color and then multiple passes of flexographic printing for the tactile ink instead of separate screen/gravure steps. This allows thicker tactile ink layers and better coverage without blocking screens or gravure plates. The offset printing provides the background color and the flexographic passes add the tactile effect. It simplifies the process, reduces ink accumulation, and saves time vs separate steps.

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Offset printing process for creating snowflake patterns on packaging materials like cigarette packs. The process involves treating the offset printing surface before and after printing. The steps are: 1. Humidifying and freeze-drying the offset printing surface. 2. Dispensing printing glue. 3. Printing the snowflake design. 4. Treating the printed surface to improve quality. 5. Drying the printed surface. This offset printing method allows creating snowflake effects with higher quality, lower cost, and faster throughput compared to gravure or screen printing.

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Simplified printing process to create 3D effects on printed materials like packaging boxes. It involves offset printing the graphics and background, then covering the areas around the graphics with a matte oil layer. This creates a 3D effect as the matte layer contrasts with the glossy offset ink. Die-cutting is done to finalize the shape and size of the printed item.

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An efficient and inline method for printing with cold foil on offset printing machines. The method involves transferring a foil to a base paper using an offset printing setup with a cold foil module. The foil is adhered to the base paper using an adhesive applied before printing. The foil is transferred and pressed in the cold foil module after supplying the base paper. The foil tension and blanket pressure are optimized to prevent wrinkles and fractures. The glue roller temperature is increased slightly and the wet water amount is reduced compared to ink printing. The blanket hardness is also adjusted. The ink printing, coating, and UV curing are done sequentially in the offset setup.

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Double-sided printing process for paper-plastic composite materials like food packaging films that can print on both sides of the composite material. It involves using a flat offset printing plate for one side and a gravure printing plate for the other side, with matched plates on each. The gravure plates are wound around the gravure cylinder. This allows simultaneous printing on both sides of the composite material by alternating between offset and gravure printing. The matched plates ensure proper alignment of the double-sided patterns.

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An offset printing device for printing packaging film in a way that prevents ink bleeding between adjacent patterns. The device has a printing cylinder with staggered printing plates, an ink supply assembly with an inking cylinder that touches the printing plates, and an ink tank. The ink tank, inking cylinder, and printing cylinder are all mounted on the base. The staggered plates on the cylinder prevent adjacent patterns from overlapping and connecting ink, eliminating bleeding. The inking cylinder supplies ink to the plates as they rotate.

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A printing method for packaging materials that provides high gloss without requiring additional coating steps. The method involves offset printing using a specific ink composition and printing sequence. It involves applying a first ink containing rosin-modified phenolic resin, vegetable oil, and mineral oil to coat the paper. This creates an initial high-gloss layer. Then, 1-3 more times, offset print with a second ink containing rosin-modified phenolic resin, vegetable oil, and additives. This final ink composition provides additional glossiness. The total number of offset printings is 2-4 using the optimized inks.

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A printing unit for printing patterns on the sides of paper-plastic packaging boxes. The unit has a mounting seat, an ink supply mechanism, and a printing assembly. The ink supply mechanism provides ink to the printing component, which is a plate with embossed patterns. The printing component contacts the outside of the box to transfer the embossed patterns with ink. This allows complex patterns to be printed on the sides of paper-plastic packaging boxes using a specialized printing unit instead of just simple text like dates and batch numbers.

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Flat pattern printing device for paper-plastic packaging boxes that allows printing complex designs on the ends of paper-plastic packaging without leaving dents or causing color variation. The device has a conveyor to move the boxes, an ink system, and a printing assembly. The printing assembly has an embossed pattern plate that contacts the box end to print the pattern. A rolling mechanism connects the pattern plate to a printing roller. By adjusting the rolling mechanism, the plate and roller can be aligned or offset. This allows printing on the upper or lower ends of the box by adjusting the roller position relative to the plate. It prevents color variation and dents compared to direct contact printing.

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Offset double coating method for packaging materials like wrapping paper that provides high gloss without separate coating steps. The method involves using offset printing twice, first with an ink containing rosin-modified phenolic resin, vegetable oil, and mineral oil, followed by printing again with the same ink. This creates a two-layer high gloss coating without additional coatings like UV or lamination. The first ink composition is 90-110% vegetable oil and 40-70% mineral oil with rosin-modified phenolic resin, while the second ink adds 10-35% additive. The ink amount is 0.5-2 g/m2 per printing.

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Offset double coating method for packing materials like wrapping paper to achieve high gloss without separate coating steps. The method involves offset printing twice using two inks, the first ink containing rosin-modified phenolic resin, vegetable oil, and mineral oil for the initial high gloss layer. The second ink has the same resin, vegetable oil, and an additive. By layering the high gloss coats through offset printing, it eliminates the need for separate coating processes like UV or lamination for glossiness. The offset printing allows controlled ink application and drying to build up the gloss without excess ink or slow drying issues.

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A method for printing embossed patterns on packaging materials without deformation and stability issues. The method involves using a UV ink with a concavo-convex pattern attached to the surface of the printing roller. This roller has a letterpress plate with embossed lines that adhere to the UV ink when printed. This allows precise control of ink thickness for stable printing and variability in pattern depth. The reticulated oil roller coats the UV ink onto the printing roller. The oiling roller spacing regulates ink coverage for pattern extent. The UV ink cures on the printed material for a 3D embossed effect without deforming the surface.

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