After the adhesive label is processed into the finished product by die-cutting, the back-end paper will generally be left wider than the label. This is to facilitate labeling when the customer labels the label. It is easy to split the bottom edge of the label into a small crack during the label packaging, transportation and handling. The automatic labeling machine has a certain tension when labeling, and the label with a crack at the edge of the bottom paper is easily broken under the action of the tension to cause the labeling and breaking. In addition, there are also cases where the improper adjustment of the roller on the automatic labeling machine causes the bottom paper on the edge of the roller fracturing label to cause a label breakage. In general, the label-breaking band caused by the roller crushing the backing paper is relatively regular.
If the finished product label is rewound too tightly, the adhesive in the adhesive will be squeezed out to cause bleeding, and the oozing glue will stick to the back of the base paper so that the entire roll label cannot be easily released. This is especially true in summer. If the label is relatively narrow, the tensile strength of the backing paper per unit area will not be too great. Automatic labeling machine has a certain tension in the labeling process. When a roll of label with glue penetration is used for automatic labeling, it is very likely that the label-removed base paper is pulled off under the tension of the labeler and the tension from the inside of the roll during the labeling process. Caused labeling broken tape. The label-breaking zone caused by this situation is irregular because the tension is broken, but the fracture surface is relatively homogeneous.
The quality of die-cutting also has a great influence on whether or not it is easy to break during automatic labeling. If the die-cutting pressure is too large, the backing paper is cut through and the tensile strength of the backing paper is reduced, resulting in the labeling breakage. The faults caused by bad die cuts are relatively uniform at the bottom of the label, and the gap is at the position of the die cut line.
If the release liner (usually a silicone oil layer) of the bottom paper is damaged, it will also result in a label breakage. In this case, the broken surface of the bottom paper is serrated. Caused by the destruction of the layer caused by the raw material production coating defects, and at the same time in the printing factory inspection of the standard process due to improper practices may also cause the release layer scratches.