Water-based paper plastic film adhesive - practical application

Paper-plastic coating and paper products coating lacquer occupies an important position in the books, magazines, advertisements, trademarks, printing and packaging industries. Compared with glazing, paper-plastic coating has its advantages and disadvantages. The application of lacquer to printing papers started very early. Nowadays, the application is very extensive. Most of them have been completed in the papermaking workshop before printing. In order to ensure the absorption and drying of the printing ink and adequate adhesion properties, the paper cannot be over-coated before printing. Although printing has recently begun to attract attention, it is mainly used in packaging and middle and low-grade decorative products, while for paper and notebooks, notepads and high-end decorative products, paper and plastic films still have a considerable market share, and its The amount is still increasing, and it is estimated that it will not be easily replaced in a relatively long period of time. The only disadvantage of the paper plastic film is that the product after the paper plastic film is not easy to recycle, but the coating does not basically have this problem.

The reason why the application of paper and plastic film coating is much wider than that of coating. The main reasons are as follows: First, the decorative effect is good, the product quality is high, and the color printing pattern is more dazzling after the plastic film is treated with laser; second, the resistance of the books and periodicals The folding strength and overall strength are improved a lot; thirdly, the decorated packaging box has better moisture-proof waterproof and anti-fouling ability; fourth, BOPP film and water-based paper-plastic coated rubber are greatly reduced in price, and the supply is sufficient to make the paper plastic The cost of coating is comparable to the cost of UV coatings. Fifth, UV coatings and solvent coatings still have a certain degree of toxicity and environmental pollution, at least in the case of varnish dilution and cleaning of equipment. The organic solvents are used in the ground, and the properties of the waterborne varnish are far below the high-grade decorative and reinforcing effects.

In summary, various varnish and various paper-plastic coating decoration methods have not yet won the competition in the decoration market, but in general, the water-based coating adhesive has been in a rising stage, and it is currently in an absolute dominant position. . Water-based polishes have good environmental performance, but their decorative products are totally incomparable with paper-plastic coated products in terms of durability, folding-resistance, stain-resistance, water-proof and moisture-proofness, and reinforcement. The process and methods for the degradation and recovery of waste products from coated products are also improving and may eventually be resolved. Of course, the elimination of organic solvent-based paper-plastic coating adhesives is inevitable. With regard to the water-based film adhesive, there are many domestic manufacturers and the product brands are also more. It is worth noting that many domestic printing and packaging companies are still using toxic, flammable, environmentally polluting organic solvent adhesives. For this reason, we believe that it is the responsibility of the printing and packaging industry to promote organic solvent-free, non-toxic, non-flammable, non-polluting products. Environmental water-based adhesives. The following will take the HU 961 series water-based paper-plastic coated rubber developed jointly by the College of Chemistry and Material Science of Hubei University and Xinhua Printing Co., Ltd. of Hubei Province as an example to introduce it to various water-based laminating machines and oil-based laminating machines. Different paper, different ink printing products in the application of paper plastic film.

1. Application of HU-961 water-based paper-plastic coated glue on water laminating machine

HU 961 water-based paper plastic coated rubber is a series of products, which can be subdivided into six grades HU-961AA, HU-9610A, HU-961A, HU-961B, HU-961C, and HU-961D. These kinds of products can be used on water-based machines, but depending on the type of paper they cover, the weight of the ink, the amount of powder sprayed, and the level of gloss required for the coating, the adhesives are generally selected according to the following principles:

1 In winter or spring and plum rain season, low temperature and high humidity, all kinds of papers are highly hygroscopic, moisture is not easy to absorb and evaporate after coating, so high solid content 961A glue or slightly 961B glue should be used as far as possible. Laminators and high-demand products such as books, notebook covers, high-gloss coated paper, and offset paper should all be selected as 961A.

2 in the summer or sunny high temperature dry spring and autumn, the water is easy to absorb and evaporate. Use 961B glue as much as possible. At this time, using 961A glue, it will be too fast and easy to crust and slag, and it is not easy to clean the roller. Of course For various types of paper with slow laminating and driving speed, 96LB adhesive and even 961C adhesive can be selected. The requirements for the gloss of the coating film are generally, and the various types of papers with light ink and low dusting are also available with optional 96lB adhesive. In the winter, you can also use the 96lB rubber boldly.

3 In the summer or in sunny spring and autumn, the 961 C glue can be used for the general requirements of the film. For the ink, which is very light, and the requirements are lower, the 961 C glue or 961 D glue can be used.
4 in the summer or the product of low gloss requirements, or in any case on the yellow version of the paper, gray paper, card stock or ink printed on the plastic film on the plastic film, especially some of the low-grade fruit box cover Film can use 961D glue.

2. Application of HU-961 water-based paper-plastic coated glue on bridge type oil film laminating machine

HU-96lAA water-based glue and HU-9610A water-based glue are used on the oil film laminating machine for rapid coating of coated paper and offset paper. 961AA is a high solid content water-based adhesive. After heating and drying, the hot roll and paper are heat-press bonded. The technical conditions for driving are: drying tunnel temperature 40-60°C, hot roller temperature 50-60°C, roller pressure around 15PMa, and vehicle speed of 1200 rpm. The problem to be noticed is that before the paper plastic enters into the hot roll compound, the glue applied on the film must be dried to completely transparent, otherwise it is easy to produce snow spots. The 9610A is used on offset paper. When used in the same way as the water-based machine, it uses temperature compounding and generally does not open the drying tunnel. Roller temperature is below 40°C and roller pressure is 5PMa. The specific process of driving is: After applying good paper and film, pour the 9610A water-based glue into the glue tank, open the pump and cycle until the temperature of the roller rises to the required temperature. Glue, start the gluing should be less, the speed should be a little slower, hot roller pressure, take the paper, after taking good can be gradually accelerated. Speed ​​up to 1200 ~ 1 800 rev / min, the amount of glue to the snow-free spots, and the plastic is not extruded properly, too little glue is not sticky, and easy to blistering or snow spots; too much glue easy to stick roller, And not good cut, generally more than ten minutes after the film can be cut, after the cut aligned pile, placed more than 24171 after the binding is appropriate, short time, moisture is not dry, may wrinkle after binding.

3 . Application of HU-961 Water Base Type Overlay Adhesive in Hard Coated Case Covered Paper Compact Coating Machine

In recent years, high-end mooncakes, tea, tobacco and alcohol, mobile phones, ties, jewelry, and other high-end gift boxes have increasingly been packaged in color hard cases. The production process of these rigid gift boxes is made of 3 to 5 mm thick hard Cardboard, made of a box and a lid with a bonding method, and then coated with a color printing film on the inside and outside of the box, when the decal is coated with a color printing film, the color coated film is first rolled on a small coating machine HU 1961C Or HU a 96lD water-based paper plastic coated glue, and then glued together with a cardboard box, and the corners of the adhesive package, the final device box core, a beautiful gift box made Now. HU-961C or 961D can also be hand-glued with a brush, as long as you have the right amount of glue. HU Series 961 water-based paper-plastic coated adhesive does not contain any volatile organic solvents, non-toxic, no odor, no environmental pollution, strong adhesion, good aging resistance, can be used for the production of food packaging boxes, Many large-scale print packaging enterprises in the country have won praise.

4. Application of HU-961 Water-based Series Adhesive in Heavy Ink, Heavy Duty Powder and Double Sided Film Products

In printing and packaging design, red, green, rhubarb, dark blue and full black printing paper often appear. Because the ink is heavy, and the printing ink or printing machinery used is not very good, in order to prevent the printed inks from mutual Dull color or pollution, commonly used anti-adhesion powder such as talcum powder, these products in the film, you should use high solid content, viscosity is also high HU-961A adhesive, composite roller gap should be adjusted to make The amount of glue is larger, and it is better not to squeeze out the glue. After a long time after compounding, it is cut into slits. After the slitting, the time is longer and the cartridge or the stapler is added. For double-sided coating should also choose HU 961A glue, but the amount of glue should be less suitable. (Written by: Ai Zhaoquan Shen Wangping Wang Yulan Wei Hancheng)