Discussion on the choice of self-adhesive labeling machine

Abstract: the selection of self-adhesive labeling machine is discussed from four aspects: main function and control, speed of sending label, speed and output of printing, special use and quality of labeling Sticker is a common form of Zui in recent years, and its technology is improving rapidly For drug manufacturers, whether from labeling production equipment, or from self-adhesive label and the bottle to be pasted itself, will improve higher requirements Now facing the domestic market of adhesive labeling machine, how can drug manufacturers choose the adhesive labeling machine with higher cost performance ratio will be the problem people pay attention to In this paper, the selection of self-adhesive labeling machine is discussed from four aspects: main function and control, delivery speed, printing speed and output, special purpose and labeling quality Throughout the domestic and foreign self-adhesive labeling machines, their working principles are the same, are made of label stripping transfer and rolling, but their control and manufacturing are not the same General self-adhesive labeling machine is composed of label mechanism, rolling mechanism, hot stamping mechanism, conveying mechanism, transmission mechanism, frame and control system Among them, the rolling and pasting mechanism is also divided into roller rolling and pasting methods suitable for flat bottles and roller pasting base rolling and pasting methods suitable for round bottles At the same time, the self-adhesive labeling machine is divided into vertical and horizontal type according to the bottle status; low speed, medium speed and high speed according to the label delivery speed; round bottle, flat bottle, square bottle and long bottle according to the characteristics of the pasted container (the special-shaped bottle is less in the pharmaceutical industry); single-sided and double-sided labeling according to the requirements of the labeling; general label and transparent label according to the labeling characteristics 1 From the perspective of main function and control, the labeling position detected by the self-adhesive labeling machine in the past is based on the front edge of the bottle body as the sensitive point Because bottles with different diameters need to make corresponding eye movement or labeling time change If this change is not made, the labeling can not be ensured at the required position of each bottle The current products all have the function of "automatic calculation of label length", which can effectively make up for the above weakness "Automatic calculation of label length" is an automatic control technology formed on the combination of PLC and servo motor technology When the conveyor belt bottle passes the detection of the electric eye, the radius of the bottle is measured, and the Zui bump on the outer circle edge of the bottle is taken as the sensing point of the labeling signal, that is, no matter how small the bottle diameter is, the Zui bump on the outer circle edge of the bottle is taken as the sensing point of the labeling signal, so the electric eye There is no need to adjust the distance from the stripper plate mechanically, and there is no need to adjust the marking time at all This is the automatic control principle of "automatic calculation of label length" This is also the point that people should have function for the sticker In terms of the synchronicity of the control speed, the self-adhesive labeling machine shall not only be equipped with the above "automatic calculation of label length" function, but also automatically complete the synchronous adjustment of the conveyor belt speed, labeling speed, labeling length, etc., which is also the difference from the traditional self-adhesive labeling machine and the guarantee of labeling quality stability The control speed of traditional self-adhesive labeling machine is adjusted by human experience, and the difficulty of human adjustment is that all movements are difficult to synchronize If it is not synchronous, the labeling process will change frequently, resulting in poor labeling quality In the control system, the control system of (PLC + human-machine interface) is the main one Compared with the early single-chip computer (single board computer), the use of general-purpose PLC as the main control device can make the PLC control system achieve the following purposes: (1) more stable and reliable; (2) more convenient maintenance and upgrading in the future; (3) it can be easily online controlled with the upper and lower stations In addition, we also need to consider adding a visual system, which can detect, control and alarm the integrity of printing, the status of words, and whether the labeled label is complete or not 2 From the aspects of the speed of delivery, the speed of printing and the output, when choosing the sticker machine, people often only pay attention to the output of labeling (i.e how many pieces can be pasted per minute), but fail to consider the speed of delivery, the speed of printing and the speed of rolling Although the labeling output covers other indicators, other speed indicators play a key role in the use quality and production development People can observe the advantages and disadvantages of each mechanism and the potential initiative from its analysis, which is also the reason why the selection of sticker machine should be comprehensively investigated (1) the delivery speed of self-adhesive labeling machine is often not comprehensively confirmed according to the label width and printing speed when matching the output of self-adhesive labeling machine It is also unreasonable to choose only the Zui high output index in the manufacturer's sample, because the high output index of Zui given by the general manufacturer's sample is based on a certain label length and a certain printing method It depends Therefore, in the selection of the output of self-adhesive labeling machine, we should first examine its delivery speed Theoretically, the relationship between delivery speed and labeling output is: q = 1000V / (L + a), where: q is the Zui large labeling output calculated by Zui large delivery speed, piece / minute; V is Zui large delivery speed, M / min; L is the length of a single label, mm; a is the distance between labels, mm For example, when labeling a φ 36 bottle, l = 52mm, a = 3mm, v = 25m / min, then q = 454 pieces / min That is to say, when you choose v = 25m / min and consider other factors, the labeling length L = 52mm, the Zui large labeling output can only be in the range of 400 pieces / min, not to mention the future acceleration or replacement of longer labels In the domestic market, generally speaking, the Zui large delivery speed of self-adhesive labeling machine products is 38m / min, while the companies with technical strength set the Zui large delivery speed of products as 70m / min, which can show that: under the condition of ensuring the original labeling output, it can also adapt to the label length change (changing); the high delivery speed is based on the technology of mechanical hardware quality, high component configuration and servo control Technically, it's not something that ordinary manufacturers can manufacture Its value just reflects the professional and technical level of manufacturers (2) the printing speed of the self-adhesive labeling machine is particularly important for the labeling machine used in the pharmaceutical industry to print the batch number in place Therefore, in the selection of the speed of the self-adhesive labeling machine, the printing speed of the printer should be considered, and the smaller Zui can be taken as the actual labeling production capacity In the pharmaceutical industry, the batch number printed on the label of self-adhesive is mainly hot stamping, which is a technology of printing words by heating the letterhead through the ribbon Why is hot stamping the way to print batch number of label in pharmaceutical industry? Compared with the recent ink-jet printing, the hot stamping printing has the advantages of low production cost and equipment maintenance cost; the hot stamping printing will not produce the similar part of the ink-jet printing device when printing, the odor emitted by the solvent will affect the circulation of the air conditioning system; and the color band can be recycled, which has an environmental protection aspect Although hot stamping has its own characteristics, it also has its weakness, that is, its printing speed is limited to a certain extent The rapid speed of domestic hot stamping machine Zui is generally 400 times / min after this value, the printed text is not clear Therefore, some people think that the high output of the self-adhesive labeling machine Zui with hot stamping can only be set at 400 pieces / minute, and the self-adhesive labeling machine with the output of more than 500 pieces / minute should be equipped with ink-jet printing 3 From the perspective of special use, we often encounter the problem of special use when labeling bottles For pharmaceutical production, we may encounter: (1) double-sided labeling; (2) similar plastic bottle surface has the phenomenon of "bubble" on the label surface or the label adhesion decreases due to the release agent This puts forward more special requirements for the selection of self-adhesive labeling machine 3.1 Consideration should be given to the selection of double-sided stickers If the flat bottle, square bottle and round bottle need to be pasted on both sides, the following points should be considered at least: (1) the label head can realize the adjustment of multidimensional space to ensure the accuracy of labeling, such as the adjustment of 6-dimensional space; (2) the label head adopts the design of double pressing roller to improve the tension of the label, so as to facilitate the labeling of long label 3.2 consideration of "bubble" on the surface of labeling (1) the influence of static electricity should be eliminated The electrostatic treatment of the bottle body can be carried out by the de electrostatic ion fan, and the static electricity of the label can be removed by the electrostatic brush at the same time; (2) the labeling pressure should be increased, and the adhesion between the label and the bottle should be increased as much as possible; (3) in the labeling process, the label should be in line contact with the bottle as much as possible, so as to thoroughly drive out the "bubble" 4 Selection from the quality of labeling Generally recognized labeling quality requirements are: (1) labeling error ＜± 1mm, which can be achieved even if the overlapping position of labeling is repeated for many times; (2) after labeling, the label and the bottle surface shall be fitted, flat, without wrinkles and "bubbles"; and (3) the printed batch number shall be legible, without overlapping and blurring, and the batch number position error is less than ± 1mm In order to achieve the above labeling requirements, in addition to the label quality and reasonable operation, it is also related to the equipment, so the following points should be considered in the selection: (1) the flatness of labeling, mainly depends on the reasonable design of the rolling mechanism and high-precision processing, to ensure the line contact between the label and the surface of the bottle under the rolling pressure; (2) the high configuration requirements of the driving elements, because of the labeling action The core of the system is a servo motor with high precision and ultra-low inertia In order to ensure the labeling quality, the system applies closed-loop control, and the motor itself can compensate itself at its own position at any time; (3) detection mode and detection elements are also the basis to ensure the labeling quality and labeling production The manufacturer with technical strength only detects the label printing instead of the past detection elements The imperfection brought about by this is that the detection method is now changed to thickness measurement, which uses the thickness change generated by the gap between the label and the label to control the servo electric operation, which is currently the best detection method of Zui, so the reliability is greater; (4) to achieve labeling, the control of the whole machine is also very important, especially the bottle conveying speed and the sending speed In the selection control, it should be noted that the production speed signal can be sent to the system synchronously, and then sent to the servo motor through analysis and calculation, which requires the speed matching between the two; (5) component configuration, because today's high-speed labeling is based on the continuous operation of the machine, which requires that all components respond quickly, and all actions are completed in an instant, which also requires the configuration of detection components For example, there are configuration requirements for labeling servo motor, labeling motor driver, conveyor motor, paper receiving motor, separation motor, frequency converter, labeling eye, label detection eye, paper receiving stop proximity switch, programmable controller and human-machine operation interface elements 5 Setting of label selection and printing 5.1 Label selection the label used by the sticker machine is in roll shape The quality of the label will directly affect the quality of the label The processing of die cutting, slitting, static electricity and dust in the label printing process is also important The basic requirements for self-adhesive label are shown in Table 1 Table 1 basic requirements of self-adhesive label: the base paper is 62g white grazin paper, the paper is dense, has good internal strength and light transmittance, is not easy to tear, and has good die cutting performance The basic weight is 62g / M 2 ± 5