The new generation plastic-plastic adhesive features:
The new generation of plastic-plastic peritoneal adhesive is the Wuhan Lisheng Chemical Materials Research Institute, relying on the environmentally-friendly alcohol-soluble plastic composite adhesive independently researched and produced by the Printing and Packaging Department of Wuhan University, and adopting the unique coupling agent cross-link curing technology, selecting the environment The friendly benzene-free material and heavy metal alcohol solvent meet the national food and hygiene pharmaceutical packaging requirements with its excellent comprehensive cost performance. It is widely recognized by friends in the printing and packaging industry and has been promoted throughout the country.
The product has a wide range of adaptability, easy operation and flexible use, and the dilution ratio can be freely adjusted according to compounding requirements, and is easy to clean. For BOPP, CPP, CPP aluminized film, PE, PET, PET aluminized film, pearl film, PA and other flexible packaging required substrates have strong adhesion (including PE, CPP, BOPP film surface tension to reach 38 Da Due to the above; PET, PA film to reach 50 dyne or more). It is possible to achieve higher adhesive fastness, less man-hours, and high production efficiency without maturing. If cured at 40-50°C for 2 to 4 hours, the adhesive fastness is stronger. The product is suitable for composite inks. It also has good adhesion to surface printing inks. The composite product has good light and vivid patterns and does not destroy the ink hue. Effectively reduce production costs. The comprehensive cost of using this product is 20%-40% lower than polyurethane glue. The use of the product is very simple. Before use, the rubber roller, plastic disc, and scraper blade should be completely cleaned with ethyl ester, and then washed with industrial ethanol and then poured into new generation of plastic. If the new generation of glue is used for a long time, it can be cleaned only with industrial ethanol.
The new generation of composite coating is suitable for the coating of any light roller and cable roller. According to the use of materials and different requirements, dry glue coating control in the 2-4g/m2. Pearl film composite dry glue amount 1.3-1.5g/m2, composite MV vacuum aluminum coating dry glue amount 1.5-2g/m2. When compounding with a product using a composite ink, the amount of sizing should be appropriately increased.
Common problems in use and solutions:
phenomenon:
One, bubble (white point)
Causes: 1. The surface tension of the film is not enough or the agent overflows.
2. There is not enough glue on the glue to form a continuous film.
3, heat sealing roller temperature is too low or pressure is not enough, not 2 times activated or not compacted.
4, the drying tunnel temperature is too high, the solvent out of the glue film surface.
5. The viscosity of the glue is too high or the viscosity is too low.
6. The gluing screen roller is blocked or the foreign matter is sticking, or the angle between the composite roller and the film is incorrect.
7, glue bubbles or substrate hard and thick air involved.
8, ink contains too much slip agent and glue incompatibility.
9, ink dry solvent residue after compound overflow
Solution: 1. Replace the qualified base film.
2, increase the amount of glue, use good leveling glue.
3, increase the heat sealing temperature or increase the pressure.
4. Set the temperature of the drying tunnel correctly.
5, the correct choice of glue concentration and use of low viscosity glue.
6. Clean the rubber roller and adjust the angle between the roller and the film.
7, adjust the viscosity of the glue or increase the pressure of the pressure roller.
8, replace the ink species.
9, low-temperature high air volume so that the ink is completely dry.
Second, the coating is uneven and transparent part of orange peel
the reason:
1, too much glue, the number of roller lines is too small.
2, poor glue leveling.
Solution:
1, control the amount of glue, use the right number of lines on the rubber roller, use a smooth roller.
2, choose a low viscosity or good leveling glue.
Third, small crystal point
the reason:
1. The glue is circulated on the low-medium speed machine, the glue consumption is slow, the solvent volatilizes too much, and the glue thickens.
2, the film's own crystal or bad color.
Solution:
1. Use fresh glue or filter the glue.
2, replace the film.
Fourth, black spots
Cause: Black spots
1, electrostatic adsorption of air impurities.
2. The pH of the ink or glue is too large or too small to react chemically with the aluminized powder.
Solution:
1. Eliminating static electricity, doing a good job in environmental sanitation and civilized production.
2, replace qualified ink. Pay attention to the compound gold and silver ink when the solvent can not contain acidic substances.
Fifth, tunnel-shaped wrinkles
the reason:
1, slitting, color printing, improper control of composite tension, film tensile deformation.
2, color printing, composite temperature is too high, the film heat deformation.
Solution:
1. Correctly control the tension.
2, correctly control the temperature at all levels.
Six, no rules wrinkle
the reason:
1, too little plastic, bag punching Department wrinkled.
2. The glue is not completely cured, the solvent volatilizes badly, and the glue is stirred unevenly.
3, film additives solid powder "sandblast" overflow, liquid "sweat" overflow, PET film K coating is too thin.
Solution:
1, increase the amount of glue, especially nylon membrane.
2. The glue is not fully ripened, the temperature of the oven is increased and the amount of exhaust air is increased, and the glue is evenly mixed.
3, the entire process to control the processing temperature, do not allow additives to overflow, replace the base film qualified, summer high temperature and high humidity to strengthen the base film additives overflow detection.
Seven, color pattern bite color
the reason:
1, the previous color is not completely dry.
2, color printing pressure roller is too large.
3. The solvent in the glue erodes the composite ink layer.
Solution:
1, before the color to accelerate the dry solvent, reduce the winding capacity, before and after color printing plate mesh staggered 15 degrees, the use of different manufacturers before and after the color ink. Low-temperature and high-volume printing, reducing the color printing speed, the problem is not serious color film in the compound machine air drying
2. Appropriately reduce the pressure of the second, dry the hair on the post-color printing plate to prevent the solvent from biting.
3, high concentration of glue, increase the temperature of the compound drying tunnel, speed up the compounding speed.
Eight, individual colors play an obscure
the reason:
Static spots caused by static electricity
Solution:
Color printing process to eliminate static electricity, clean electrostatic brush, check the ground is connected, the site will increase the relative temperature to about 65%, plus 10% isopropyl alcohol printing
Nine, aluminum plating composite layer transfer
the reason:
1. Use packaging grade film instead of vacuum aluminized grade film.
2. The initial viscosity of the glue is too high, too hard after curing, and the aluminum-plated layer is pulled laterally in parallel.
Solution:
1, change qualified aluminum film.
2, using soft glue
Department of Printing and Packaging, Wuhan University Qian Jun Ma LishengReprinted from: China Ink Technology Network
Ningbo Yinzhou Hengxi Winbate Household Product Manufacturer , https://www.winbatehousehold.com