In the process of bonding packaging products, the following problems are always easy to occur: the amount of glue applied is too thick, causing glue to overflow after pressing, which not only affects the appearance of the product, but also easily causes adhesion between the packaging boxes. If this happens, leave it on for 2 to 5 minutes after brushing the glue and wait for the adhesive to dry slightly before pressing. If the glue brush is too thin, and the drying time is too long, it will lead to poor adhesion fastness, and sometimes it will not bond at all. When this happens, you should read the instructions and consult the manufacturer.

There is no pressure or the pressure is too small, which will cause the bonded product to automatically pop up. This situation is mainly for products with high stiffness, so it must be pressed for at least half an hour, because many adhesives are contact type It is sticky, so the two surfaces to be bonded must be effectively pressed together. In a unit time, if the initial tack is less than the elasticity of the product, the product will bounce off, so the general product requires 0.5 hours of pressing time.

In order to save the cost of raw materials, some manufacturers use laminating adhesive and milk white glue to glue boxes or use a large amount of water to dilute the adhesive, resulting in insufficient adhesion fastness and poor adhesion on the film. This situation is very dangerous, and it also violates the bonding principle and process. I hope that users of various adhesives will not cause greater losses to themselves because of blindly using glue.

The packing box will be degummed during the cold winter. This is mainly because some adhesives have poor low temperature resistance. Below 5 ° C, the surface of the adhesive will lose its activity, resulting in a decrease or disappearance of the adhesion. And in the hot summer, the sticky packaging box will also pop out of the warehouse or transport box. This is mainly because the high temperature resistance of this kind of adhesive is not good, and the adhesive layer becomes soft and the strength becomes small at a temperature of 50-60 ℃, which leads to degumming of the packaging box.

The bonding effect of the packaging box in the early stage of good adhesion (usually half a month) is very good, and as time goes on, the packaging box will be degummed. This is mainly due to the poor adhesive durability of the adhesive itself, most of which is due to the addition of some plasticizers to the adhesive. With the extension of time, the plasticizer migrates to the paper base, which causes the adhesive layer to become hard and brittle, resulting in products Degumming. On the other hand, because the adhesive contains a large amount of unsaturated bonds, the product's aging resistance is not good, the storage period is prolonged, the film becomes brittle, and the product is degummed.

If the warehouse is very humid, if stored in it for a long time, not only the humidity of the product will exceed the standard, but also the product will be degummed. This is mainly because the product absorbs moisture, and the water resistance of the adhesive itself is not good, which causes the adhesive layer to become soft and produce delamination.

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