Back-cutting of self-adhesive materials means that the label fabric is die-cut or not die-cut as normal, and the base paper is cut in some way.
There are several purposes for undercutting:
1. Remove excess backing paper. Some labels require a small amount of backing paper on both sides of the edge during application, such as various types of printed labels. If printing with a small paper edge, the edge of the paper is easily broken during waste disposal, causing downtime and increased waste, and it is not conducive to high-speed production. In order to solve this problem, when printing on a rotary machine, a certain size of paper edge is kept on both sides of the roll paper, which can increase the strength of the paper edge. Before discharging, use a round knife to continuously cut the excess backing paper on the backing paper and cooperate with the front die cutting. At the end of the waste removal, the excess backing paper and the paper edge are removed together, so that the label has a small bottom paper edge Will not affect the production due to the low strength of the paper edge. The above back-cutting can also be carried out after waste disposal. This method is suitable for various printing label machines.
2. It is easy to remove the bottom sheet. Some integral labels or large labels require quick removal of the backing paper during application. If it is only opened from one end, it will cause trouble to the user. In order to quickly remove the bottom paper, the method of cutting in the middle of the bottom paper can be used, so that the bottom paper can be easily removed. For example, some express mail labels use back-cutting technology, so that they can quickly remove the backing paper when they are applied.
3. Special craft purpose. Partial back-cutting is used, and the front and back sides of the round die-cutting roll are die-cut together. Because the backing paper on the back of the label is cut off as a whole (usually a closed figure), when the label is peeled off from the backing paper, the backed off backing paper is integrated with the label fabric. This is equivalent to a part of the back of the label that is not glued. This type of label is a special label used in special occasions, such as a label on a sock, a food sealing label, a luggage label used on an airport, etc.
There are two types of backcut:
1. Cut back from a single sheet of paper
It is performed on a single-sheet paper back-cutting machine. The operator manually renews the paper, and the back-cutting position is changed by changing the position of the round knife. Generally, the process of back-cutting, then die-cutting and waste-discharging is adopted.
2. Roll paper back cut
1) Continuous back cutting. It can be carried out on the label machine, or on the roll paper back-cutting machine.
2) Local backcut. As described above, the die cutting is performed by the die cutting roller installed under the backing paper.
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