In recent years, self-adhesive labels are widely used in product packaging, almost in all kinds of product packaging can see the figure of self-adhesive labels. Self-adhesive labels in the adhesive process sometimes occurs some problems, after the label appear drum or warping is one of the problems!
     Usually, the label drumming or warping can be divided into two cases: one is in the label within 24h warping, some serious and even in the label immediately after the warping; the other is in the label 24h after the warping. If the warping occurs immediately after the labeling, you can immediately stop production and analyze the reasons for targeted processing, but if the labeling 24h after the label began to appear warping, the problem is more troublesome to deal with, because at this time some customers have begun to box shipment, if this time to find that the label warping, often delayed shipment of time, and at the same time labeling warping of products to be reworked to re-apply the labeling, which will result in a larger Economic losses.

Theoretically speaking, self-adhesive labels in the labeling after 24h if it does not warble basically will not warble again, but the reality is that there will be labels labeling 24h after the gradual occurrence of warping or drumming phenomenon. Why will there be warping or drumming after 24 hours?

The main reason is that the viscosity of the glue is not enough, the viscosity of self-adhesive glue mainly has the initial viscosity and viscosity. Initial viscosity to solve the problem of whether the label can be attached to the problem, the adhesive force to solve the problem of whether the label can be attached to the problem of firmness. In other words, if the label is pasted on the surface of the affixed object will warp immediately, which indicates that the initial adhesion of the glue is not enough, but if the label is applied after 24h without any problem, after 24h after the label began to gradually appear warping or drumming, which indicates that the glue is not enough to hold the adhesive.
We know that the surface layer of self-adhesive labels have a certain degree of stiffness, usually the thicker the surface layer, the greater the stiffness. Especially after lamination of the label stiffness is greater. In practice, many labels are pasted on the curved surface, such as stickers on the surface of the drum self-adhesive labels, due to the sticker is a curved surface, and self-adhesive labels are flat, at the same time the label's surface layer and a certain degree of stiffness, these factors are superimposed together will lead to the labeling labeling labeling under the influence of its own stiffness to form a reverse tension, this reverse tension and the cohesion of the glue has been doing the fight, if the If the cohesion of the glue is less than the reverse tension of the label, then labeling 24h after the label will gradually appear warping or bulging. Glue viscosity is an important indicator of the reaction of the glue cohesion, if the viscosity is not enough often indicates that the glue cohesion is not enough, the common point is that the internal bonding force can not resist the surface layer of the reverse tension so that the glue delamination zui ultimately lead to label warping. We can observe, labelling 24h after warping of the label in the label down when often there will be residual glue left on the surface of the affixed object, which indicates that the glue in the label under the pull of the reverse tension of the delamination.