The working principle of the hottest self-adhesive

The working principle and requirements of self-adhesive label automatic labeling machine

there are many kinds of self-adhesive label automatic labeling machines with different functions, but the basic principles are similar. The labeling process of a flat object in a flat labeling machine: a roll of labels is placed on the unwinding wheel of the labeling machine, and a group of rollers make the drum label and stop, and control the tightness and tension of the drum material. The functions of each component are as follows:

(1) unwinding wheel. It is a driven wheel, which is used to place the drum label. Usually equipped with friction braking device with adjustable friction, the purpose is to control the speed and tension of the drum and maintain stable paper feeding

(2) buffer wheel. The tool is connected with the spring. It can swing back and forth. The purpose is that when the device is started, it can absorb the tension of the drum material from the monthly view, keep the material in contact with each roll, and prevent the material from breaking

(3) guide roller. It is composed of upper and lower parts, which plays the role of guiding and positioning the drum material

(4) drive roll. It is composed of a group of active friction wheels. Usually, one is a rubber roller and the other is a metal roller, in which the backing paper passes. The function is to drive the drum material and realize normal labeling

(5) winding wheel. It is the driving wheel with friction transmission device, which is used to rewind the bottom paper after labeling. The rotation of the paper receiving wheel does not interfere with the paper handling of the driving wheel, and the synchronous drive is adjusted by the friction device

(6) peel off the plate. There is an angle (generally less than 30) from one end of the plate, so that when the backing paper changes direction through the stripping plate, the label can be easily marked out and separated from the backing paper, so as to realize contact with the labeled object

(7) labeling roller. The process of evenly and smoothly pasting the label separated from the backing paper on the label to be automatically labeled is: when the sensor sends the signal that the label is ready for labeling, the drive wheel on the labeling machine rotates. Because the reel label is in a tensioned state on the device, when the backing paper clings to the stripping plate and changes the direction, the front end of the label is forced to disengage and ready for labeling due to the certain rigidity of its own material. At this time, the labeling object is just located at the lower part of the label, and the synchronous labeling is realized under the action of the labeling wheel. After labeling, the sensor under the drum label sends a stop signal, the drive wheel is stationary, and a labeling cycle ends

no matter what type of labeling machine, the labeling process is roughly similar. The difference is that the installation position of the labeling device is different, the handling and delivery mode and positioning mode of the labeling object are different, and the form of the labeling roller is different

general automatic labeling machines have the following requirements for labels:

(1) surface materials. The rigidity of the label is the key to the standard, so it requires a certain strength and hardness of the surface material. The rigidity of the label is reduced by 39% compared with the raw metal structure. The rigidity is related to the thickness of the material and the area of the label. Therefore, when using soft film materials, it is necessary to appropriately increase its thickness, which is generally controlled at more than 100 m. Thin paper materials, such as stickers of 60~70g/m2, are generally not suitable for making large labels, but suitable for processing into small labels, such as price labels used on price guns. The poor rigidity of the label will lead to the failure of labeling, or the label will be rewound with the backing paper, making the automatic labeling invalid

(2) release force. Also known as peeling force, it is the force when the label is separated from the backing paper. The release force is related to the type and thickness of the adhesive, the silicon coating on the surface of the backing paper, and the ambient temperature when labeling. The release parameters mainly correspond to that the head and tail removal forces are too small, and the label is easy to fall off during the conveying process (from the bottom paper); The release force is too large, and it is difficult for the label to separate from the bottom paper, so it cannot be marked. All technical indexes should be comprehensively controlled to make the release force within a reasonable range

(3) backing paper. It is also an important indicator to control automatic labeling. The surface of the backing paper shall be coated with silicon evenly and the release force shall be consistent; Uniform thickness and good tensile strength ensure that there is no fracture when labeling; Uniform thickness and good light transmittance ensure that the sensor can correctly identify the position of the label

(4) processing quality. It is required that both sides of the base paper after slitting should be flat and free of cracks, so as to prevent the base paper from breaking when the tension changes. 1. Product standard. During die cutting, avoid cutting through the base paper or damaging the silicon coating layer. If the base paper and the silicon coating layer are damaged, it is easy to break the base paper or the adhesive in the label seeps into the base paper, resulting in non marking and tearing of the base paper. In addition, before labeling, eliminate the static electricity in the web label, because static electricity will cause no labeling or inaccurate labeling