An Overview Of Various Labeling Methods For Self-Adhesive Labeling Machines

Labeling machines, which apply rolls of self-adhesive labels (whether paper or foil) to products, printed circuit boards, or specialized packaging, have become an indispensable part of the modern packaging process.

Labeling machines, a key piece of equipment in the modern packaging process, are widely used to label a wide range of products. While there are many different types of labeling machines on the market, their labeling methods can be primarily categorized as wipe-on, blow-on, and suction-on. Each method has its own advantages and challenges.

Wipe-on, a common labeling method, works by contacting and applying the label with the leading edge of the label, which then removes the label from the product, completing the labeling process. This method boasts high labeling speed, but labeling accuracy is primarily affected by the speed at which the product passes through the labeling machine and the speed at which the label is dispensed. When these two speeds are aligned, labeling accuracy is guaranteed; otherwise, the labeling machine's performance is compromised.

Suction-on method
Another labeling machine's operating principle involves the label being drawn onto a vacuum pad after leaving a conveyor. This pad is connected to a mechanism that extends until the label contacts the product and then rapidly retracts, attaching the label to the product. This method offers high precision and is particularly suitable for labeling complex packaging; however, its application speed is relatively slow.

Blow-on method
A refinement of the suction-on method, the key difference is that the vacuum pad remains stationary, while the label is fixed and positioned on a surface called a "vacuum grid." This surface is perforated with small holes that maintain and form "air jets." Through these powerful "air jets," a stream of compressed air is blown, propelling the label from the grid and allowing it to adhere to the product. This method is particularly suitable for labeling products whose surfaces cannot withstand scraping pressure. However, its disadvantages are that the process is relatively complex and the labeling quality can be difficult to precisely control.
After comparing the three labeling methods, we found that the wipe-on method significantly improves labeling machine efficiency, meeting the demand for high-efficiency production. The labeling machine offers both linear and circular labeling options for bottles and other packaging containers.

1) Linear Labeling Mode
In this mode, the container remains upright and moves forward, while the adhesive-coated label is precisely applied to the container at the designated location. This process involves three key phases:
1. The container intermittently moves forward during the labeling process, with label application occurring during periods of rest.
2. The label is fed to the designated location as the container moves, ensuring precise application.
3. By aligning the speed of the adhesive-coated label with the container's movement, tangential labeling ensures smooth application and synchronizes precise label application to designated locations such as the bottle body, neck, and shoulder.

2) Circular Labeling Mode
The bottle or can is placed horizontally and rotated while the label is applied.