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Talking about the printing hole deviation of self-adhesive paper roll
At present, the web printing process of self-adhesive paper is widely used in express delivery applications. The bottom layer of the delivery label is made of self-adhesive paper, with carbonless copy paper as the face paper and release paper as the backing. These layers are combined into a self-adhesive roll, which is then punched and printed with barcodes. Finally, the labels are separated into upper and middle sections to complete the express delivery labeling process. However, during the rewinding process of the perforated adhesive paper, alignment holes on both sides of the face and bottom papers often shift near the core tube, leading to uneven hole positions. If the deviation exceeds 0.5mm, it can cause misalignment with the upper and middle sections, resulting in significant waste and production losses.
One of the main reasons for this hole position deviation is the online punching method used during the printing of self-adhesive rolls. After the holes are punched while the paper is flat, the roll is wound so that the face paper is on the outside and the bottom paper is on the inside. Due to the thickness of the paper, there is a slight difference in the winding radius between the top and bottom layers, causing a variation in their circumferences. This is illustrated in Figure 1. Additionally, the winding tension causes the face and bottom papers to stretch and deform. Because of the circumference difference, the top paper stretches more than the bottom one, and this elongation helps reduce the circumferential length difference. However, since the binding force between the top and bottom layers is relatively weak, if the elongation is not sufficient to compensate for the circumference difference, the two layers will shift relative to each other, causing the originally aligned holes to become misaligned.
The deviation in hole position is primarily determined by the difference in circumference between the inner and outer diameters of the roll, along with the amount of paper elongation. When the release paper and bottom adhesive are wound together, the holes are punched when the paper is in a single-sheet state, resulting in consistent spacing. However, during composite winding, the release paper is on the inside and the sticker is on the outside, creating a difference in the circumferences of the two layers. This difference is independent of the overall radius of the roll. The radius is calculated based on the centerline of the thickness of the release paper and the bottom adhesive. When the release paper is punched, the outer and inner radii (R_outer and R_inner) create a constant circumference difference, regardless of the roll size.
Additionally, it's important to note that users receiving fax documents should be aware of potential information loss due to thermal copying. Adding a warning message similar to the example below can help ensure clarity and prevent confusion when using the header information for fax transmissions.