Talking about the problem of opening glue in the bonding process of gift boxes

In the process of bonding packaging products such as gift boxes, the following problems are always apt to arise: too much glue is applied to cause glue to overflow after lamination, which not only affects the appearance of the product, but also tends to occur between the packaging boxes. Stick to each other. If this happens, it should be allowed to open for 2 to 5 minutes after brushing, and the adhesive should be pressed after a little dry. The glue brush is too thin, and the open time is too long, it will lead to poor adhesion, and sometimes there will be no adhesion at all. When this happens, you should understand the manufacturer's instructions according to the instructions.

No pressing or too little pressure will cause the bonded product to spring open automatically. This is mainly for products with large stiffness, so at least half an hour must be squeezed because many adhesives are contact adhesives. Therefore, it is necessary to effectively press the two adhered surfaces. In the unit time, if the initial adhesive force is less than the product elasticity, the product will pop open, so the general product requires a 0.5 hour press time.

In order to save the cost of raw materials, some manufacturers use laminating adhesives and emulsion polymers to mix the adhesive boxes or use larger amounts of water to dilute the adhesives, resulting in insufficient bonding fastness and poor adhesion on the films. This situation is very dangerous and it is also a violation of the bonding principle and technology. It is hoped that users of adhesives will not inflict greater losses on themselves by blindly using glue.

The box will show degumming during the winter season. This is mainly because some adhesives have poor low-temperature resistance. Below 5°C, the surface of the adhesive loses its activity, causing the adhesive force to drop or disappear. In the hot summer, the sticky box will also appear in the warehouse or transport box, and it will pop open and degumming. This is mainly due to the fact that the high temperature resistance of the adhesive is not good, and the adhesive layer becomes soft at a temperature of 50° C. to 60° C., and the strength becomes smaller, thereby leading to degumming of the packaging box.

The bonding effect of the packaging box is very good in the early stage of sticking (usually half a month), and the degumming of the packaging box will occur as time goes by. This is mainly due to the poor adhesive persistence of the adhesive itself, mostly because some plasticizers are added to the adhesive. As time goes by, the plasticizer migrates to the paper base, which causes the adhesive layer to harden and become brittle. Degumming. On the other hand, because the adhesive contains a large number of unsaturated bonds, resulting in poor anti-aging properties of the product, the storage period is prolonged and the film becomes brittle, so that the product is degummed.

If the warehouse is very humid, it will be stored in it for a long time. Not only the humidity of the product will exceed the standard, but also degumming of the product will occur. This is mainly due to the fact that the product absorbs moisture, and the adhesive itself has poor water resistance, resulting in a soft delamination of the adhesive layer.