The hottest new paper plastic composite adhesive w

A new type of paper plastic composite adhesive - Water-based film covering adhesive

the composite adhesive is mainly solvent-based. The main adhesive of solvent-based adhesive is SBS and terpene resin, and the solvent is toluene, 120 gasoline, ethyl acetate, etc. Because some components of printing ink are close to those of solvent based film coating adhesive, and both contain resins and organic solvents, the quality of paper plastic composite is not very stable. Especially in color textbooks, the problem of blistering is more prominent. The cover of the film covered book will not blister without a book block, and it will blister after a bag of book blocks. At the same time, solvent based adhesives have adverse factors such as low flash point, flammable, toxic, harmful, polluting the environment and affecting the health of operators

in recent years, people have higher and higher requirements for product quality, and their environmental awareness has been continuously enhanced. Therefore, it is imperative to study the use of safe, non-toxic and stable film covering adhesives

experiment on water-based film coating adhesive

in order to test the temperature resistance, moisture resistance, oil resistance and other properties of printed matter after film coating, the testers have done some routine comparative tests

1. Temperature test

put the solvent type film coated printing matter and the water-based film coated printing matter into the oven at the same time, and do the temperature resistance test at 70 ℃. After 25min, the solvent type coated printed matter wrinkled, and after 28min, the water-based coated printed matter wrinkled. The test shows that the water-based film coating adhesive meets the temperature resistance requirements of printing film coating

2. Water resistance test

immerse two kinds of film coated printing materials in water at the same time, and knead them by hand after soaking for 24 hours to separate the paper fiber from the membrane, and observe the amount of residual ink layer and fiber on the membrane. If there is much residue, it means that the adhesive has good water resistance after drying. The water resistance of water-based film covering adhesive is better than that of solvent based film covering adhesive

3. Oil resistance test

the products of water-based film coating adhesive and solvent based film coating adhesive are wrapped with some inks respectively, and observe whether there are degumming, foaming and other phenomena. Foaming was found in the solvent type test after 1 day, while no foaming or degumming was found in the water-based film covering adhesive after 5 days. It is proved that the oil resistance of water-based film covering adhesive is better than that of solvent type. The water-based film covering glue is water-soluble, and common tap water can be used for dilution and cleaning. It is non-toxic, harmless and pollution-free, but it is currently dyed

through experiments, it is proved that the application of water-based film covering adhesive is feasible. Once the ultraviolet light intensity is found to decay, the lamp tube needs to be replaced in time. In order to ensure the product quality, do not use the method of increasing the exposure time to indefinitely extend the service life of the light source

3. Correctly grasp the development temperature and time

because the main resin of photosensitive ink contains pro, it enhances the competitiveness of China's titanium industry in the world; After the completion of the project, the water group has good solubility in weak alkaline aqueous solution, usually 1% - 1.5% sodium carbonate water is used Please use the outer diameter dimension is φ 9- φ 11 (please refer to the figure) and dissolve the ink that does not see ultraviolet light. In the development process, temperature has a great impact on the dissolution rate of ink. Increasing the development temperature is much faster than increasing the concentration of sodium carbonate aqueous solution. Generally, the best range is to control the developer temperature at 30 ~ 34 ℃, and the development time is 15 ~ 30s. If the temperature is too low and the ink dissolves too slowly, there will be residual ink on the product; If the temperature is too high, the ink film of the UV curing part will be damaged or the lines will be deformed, which will affect the mechanical strength of the ink film and reduce the resistance to electroplating and etching. 4、 Coating method of photosensitive ink

the following three coating methods can be selected according to the number and shape of products

1. Printing

it is more economical and flexible to adopt plate printing for products with a large variety and a small number. Therefore, at present, most medium and small factories, when manufacturing flat products, most of them use plate printing and coating

2. Roll coating method

for factories with a large number of products, roll coating method is adopted, which is fast and efficient, and is suitable for large-scale assembly line production. Roll coating methods include smooth roll coating, thread roll coating, reverse coating and forward coating. From the perspective of effect, the screw roll coating is ideal, the ink film thickness is uniform, and the quality is good, which is the development direction of large-scale production of circuit boards in PCB factories

3. Spraying