In general we are widely used in the packaging of summer clothing such as shirts, dress pants, skirts, bag machine, due to sub, towel, bread andjewelry bag. Usually this bag with adhesive, into products can be directlysealing. In the domestic market, this bag is very popular, wide range of application. Because of its transparency is very good, is the ideal gift packaging. This kind of bag in Guangdong area especially the demand of clothing processing factory, cloth wholesale market, small commodity wholesale market, the food industry and the amount of large, only in the summer in general a small garment factory demand must be at least1500000. If the bag is printed with patterns, transparency and clarity of the pattern is not comparable to other plastic bags, which for enterprises to do a powerful propaganda in the promotion of brand. Plastic Bag Making Machine, Plastic Bag Making Equipments, Flexible Letter Press Anhui Innovo Bochen Machinery Manufacturing Co., Ltd. , https://www.innovomachines.com
When printing white board paper, the center distance between the plate cylinder and the blanket cylinder does not change, only the center of the impression cylinder and the blanket cylinder can be adjusted. The center distance of the cylinder can be increased by 0.20-0.4mm when printed on white paper of 250-450g/m2. Because the white paper surface is poor in smoothness and rough, the tightness of the paper is far less than that of coated paper. When printing white paper, the pressure of printing should be increased accordingly.
Such as India 400g/m2 whiteboard paper, plate cylinder and rubber roller gap 3.95mm, rubber roller and the impression roller gap 3.40mm, total plate printing plate village 0.65-0.75mm, the total number of rubber roller The liner is 3.15-3.35mm (measured with a micrometer). If the paper is thick and thin, the reduced thickness, which is the thickness of the liner removed from the plate liner, should be added to the blanket cylinder, if printing When the paper is thin to thick, a certain thickness is subtracted from the blanket pad and the corresponding thickness is added to the pad of the plate cylinder.
Second, offset printing part of the adjustment
1. When the white paper is printed, the air volume of the suction nozzle and the blowing nozzle of the paper feeding section must be adjusted accordingly.
2. The paper suction nozzle and the paper feeding nozzle should replace the rubber apron with larger diameter and larger thickness. The pull gauge pressure spring can be replaced with a wire with a diameter of 1.5 mm; by removing the feed roller and the shaft between the cam Connect the pins, or remove the rollers on the oscillating rod, so as to achieve the purpose of the paper feed roller not swinging and feeding smoothly.
3. When printing whiteboard paper, the double-sheet control or gap of the offset printing press must be increased accordingly; the distance between the paper-pressure tongue of the side-gauge and the front gauge and the paper-feeding board, and the distance between the safety bar and the paper-feeding board must be Increase some.
4. The distance between the transfer tooth pad and the impression cylinder surface and between the transfer tooth pad and the transfer plate should be increased, and the distance should be approximately equal to the thickness of the paper plus 0.3 mm.
Third, the color sequence when printing
1. The products printed on white paper have Hong Kong version on the spot, and they have text, lines and patterns. Such as: the postal department express delivery envelopes, wine boxes, cigarette packaging (barrels) and other printed products, printing the color sequence is best to print text, lines, patterns, and then put the full version on the last machine printing , This can avoid due to the thick white paper, the paper is not dry when the imprint is caused by the collision of the paper caused by the collision, the back of the dirty phenomenon.
2, the dark color on the front printing, light color on the back of India, due to the dark color ink strong hiding power, adhesion, placed in front of the first printing, easy to overprint accurate; light color ink hiding power is weak, It's not easy to observe the rules when you run the printing on the back side. The effect of overprinting is much better.
3, often in a printed product, there are halftone four-color electric points of the network, there are continuous adjustment of patterns, text, lines. The four-color electricity network points should be printed first, which is conducive to overprinting accurately and reducing the impact of paper stretching. Then continue to print a continuous pattern, text, lines, in the arrangement of the printing color sequence to look for the primary and secondary, the first difficult to be more appropriate.
4, such as hot weather, white paper printing monochrome encounter uneven paper moisture content, wrinkling is not smooth, poor paper surface strength caused by falling powder, hair loss, etc., can also be the first air to print a blank, you can Solve the phenomenon.
Fourth, printing white paper how to prevent dirt
1, when the full version of the original version of the field as far as possible with the original barrel of ink, without adding 6 # ink, plus some appropriate de-adhesive, anti-adhesive agent; do not add dry oil when the weather is hot. The full-fill version of the field is often prone to dirt on the back, and is often solved by dusting. Although the printed anti-adhesive dirty dusting agent contains pure plant material, the dispersion and fluidity are good, but the use of dusting agent will directly affect the printing product. The surface gloss makes the ink color unlit and pollutes the environment, and has an impact on the accuracy of the offset press.
2, white paper surface roughness, loose quality and poor ink absorption, flatness is poor, so the full-print version should be printed on the ground background, dark color after printing, background color to be deeper, printed thin, ink should not be too Big. If the flatness of the white paper is good, then when the full-print version is on the ground, the dark color should be printed first, and the amount of ink should be printed to ensure that the back surface is not dirty, and then the background color is overprinted so that the print product finish will be compared. Well, at the same time, pay attention to the balance of ink and water and control the size of the printing plate layout.
Whiteboard offset printing process
A roller lining and pressure regulation