Two component polyurethane adhesive

1)Use special adhesive for aluminized film

Ordinary adhesive solvent release is poor, the adhesive is easy to penetrate into the aluminum plating layer, affecting the fastness of the aluminum plating layer, composite if the drying effect is not good, the solvent residue is too large, the bond strength after curing will decline, and even the aluminum plating transfer phenomenon, so should choose moderate molecular weight, good solvent release, coated more uniform initial adhesion is not high aluminum plating film special adhesive.

2)The amount of glue is appropriate

The amount of glue is large, which is easy to cause the drying effect of the drying channel is not good, so that the adhesive penetrates into the aluminum plating layer, and also extends the curing time, which is prone to the transfer of the aluminum plating layer. Therefore, the amount of glue should be controlled in the appropriate position, and according to experience, it is generally controlled at about 2~ 2.5g.

3)Curing agent reduction

Improving the softness of the rubber layer can also effectively prevent the transfer of the aluminum plating layer, which is usually used to reduce the amount of curing agent, which can only be used in lightweight packaging and products with low stripping strength requirements, and polyester aluminum plating products should not use this method.

4) Improve the drying temperature and wind speed of the drying passage

In the aluminum plating film composite processing process, the drying temperature of the drying channel should be appropriately increased, such as increasing 5-10 degrees, and ensuring that the wind speed is above 5 meters/second, making the solvent volatilize more thoroughly, reducing the solvent residue, in addition, you can also use high network cable, high concentration coating can also be used.

5)Increase the curing temperature and shorten the curing time

Aluminized film composite products in the curing process should be appropriate to increase the curing temperature, shorten the curing time, so that the adhesive to reduce the penetration of the aluminized layer damage, effectively prevent the transfer of the aluminized layer, the general control temperature 50-60 degrees, the time is about 24 hours, do not cure for a long time.

6)Use good quality aluminized film

If cost permits, a high-quality aluminized film, such as one with primer, should be purchased.

Waterborne Adhesives

1)For the packaging of lightweight products, such as puffed food, instant noodles, etc., basically the material used is CPP aluminized, in order to control production costs, most of the use of single-component water-based adhesive, in the production process for many years, only the ink transfer problem has occurred, while the aluminum plating has not been transferred, while the actual test, The peeling strength after composite can be more than 1.ON / 15mm, which can meet the standard requirements of such packaging products

2)The use of water-based adhesive to produce aluminized products, the use of about 200 lines of cable roller, the amount of glue is controlled in 1.2 ~ 1.8 grams, to ensure a uniform coating amount, good drying effect, so that to a certain extent not only reduces the production cost, but also effectively solve the problem of solvent residue, to ensure the normal production of customers. Reduce the adverse effects of excessive solvent residues in the later stage. At the same time, the effect is especially ideal for the products with full white ink.

Sinograce Chemical production of a variety of transfer adhesives and water-based glue, welcome to consult and inquiry.