How to choose self-adhesive labeling machine Self-adhesive labeling machine is a common type of labeling machine in recent years, and its technology is rapidly improving. For pharmaceutical manufacturers, whether it is from labeling production equipment, or from self-adhesive labels and bottles to be bottled, it will raise higher requirements. Nowadays, facing the domestic market of self-adhesive labeling machines, how can pharmaceutical manufacturers choose a more cost-effective self-adhesive labeling machine will be a concern of people. This article will discuss the selection points of self-adhesive labeling machine from four aspects: main function and control, delivery speed, printing speed and output, special use and labeling quality.
Overview of domestic and foreign self-adhesive labeling machines, their working principles are similar, they are made by label peeling transfer and rolling paste, but it is not the same in control and manufacturing. The general self-adhesive labeling machine is composed of a labeling mechanism, a rolling mechanism, a hot stamping mechanism, a conveying mechanism, a transmission mechanism, a frame and a control system. Among them, the rolling mechanism is further divided into a roller rolling method suitable for a flat bottle and a rolling contact rolling method suitable for a round bottle. At the same time, the self-adhesive labeling machine is divided into vertical and horizontal according to the state of the bottle; low speed, medium speed and high speed according to the speed of the labeling; round bottles, flat bottles, square bottles, long bottles, etc. according to the characteristics of the container to be attached (alien The bottle is less in the pharmaceutical industry); it is divided into single-sided stickers and double-sided stickers according to the veneer requirements; general labels and transparent labels are classified according to the characteristics of the labels.
1. From the main function and control, the labeling position detected by the past self-adhesive labeling machine is based on the front edge of the bottle body. Because the bottles of different diameters need to be moved or the labeling time is changed. Without this change, it is not possible to ensure that the label is placed at the desired position of each bottle. Today's products feature the "automatically calculate label length" feature, which effectively compensates for these weaknesses. “Automatic calculation of label length†is an automatic control technology formed by the combination of PLC and servo motor technology. When the conveyor belt bottle detects the electric eye, the radius of the bottle is measured, and the zui bump on the outer edge of the bottle is taken as a sticker. The sensing point of the standard signal, that is, regardless of the diameter of the bottle, is the sensing point of the zui bump on the outer edge of the bottle, so that the distance between the electric eye and the peeling plate does not need to be mechanically adjusted. The standard time does not have to be adjusted at all. This is the automatic control principle of "automatically calculate the label length". This is also the preferred point for people to have the function of the self-adhesive labeling machine.
In the synchronization of the control speed, in addition to the above-mentioned "automatic calculation of the label length" function, the self-adhesive labeling machine should automatically complete the synchronous adjustment of the conveyor belt speed, the bidding speed, the bidding length, etc., which is also the same as the traditional The difference between the self-adhesive labeling machine is the guarantee of the quality stability of the labeling. The control speed of traditional self-adhesive labeling machines is adjusted by human experience, and the difficulty of artificial adjustment is that all movements are difficult to synchronize. If it is not synchronized, the labeling process will change frequently, resulting in poor labeling quality.
In the control system, the preferred (PLC+Human Machine Interface) control system is the main one. Compared with the earlier single-chip microcomputer (single board machine), using the general-purpose PLC as the main control device enables the PLC control system to achieve the following purposes: 1) It is more stable and more reliable; (2) It is more convenient to maintain in the future, and the upgrade is simpler; (3) It can be conveniently controlled online with the upper and lower stations.
In addition, it is necessary to consider adding a visual system that can detect, control and alarm real-time for the integrity of the print, the condition of the font, and whether the label after labeling is complete or not.
2, from the speed of delivery, printing speed and output, when choosing a self-adhesive labeling machine, people often only pay attention to the output of the labeling (that is, how many pieces can be attached per minute), but not comprehensively from the speed of labeling , printing speed, roll speed, etc. are considered simultaneously. Of course, the labeling output covers other indicators, but other speed indicators play a key role in the quality of use and production development. People can observe the advantages and disadvantages of each institution and potential mobility from its analysis, which is also the choice of stickers. The labeling machine should be comprehensively investigated.
(1) The speed of the labeling of the self-adhesive labeling machine is often not confirmed by the width of the label and the speed of printing when the output of the self-adhesive labeling machine is matched, only the high yield of the Zui in the manufacturer's sample It is also unreasonable to choose the indicator, because the high-yield indicator of the Zui given by the general manufacturer's sample is based on a certain label length and a certain printing method. Therefore, in the selection of the output of the self-adhesive labeling machine, the speed of the labeling should be investigated first. The relationship between the standard feeding speed and the labeling output is: Q=1000V/(L+a)
Among them: Q is the Zui big labeling output calculated by zui big delivery speed, piece/minute; V is the large delivery speed of zui, m/min; L is the length of a single label, mm; a is the spacing between labels, Mm.
For example, when labeling a diameter of φ 36 bottles, L = 52 mm, a = 3 mm, and V = 25 m / min, then Q = 454 pieces / min. That is, when you choose V=25m/min, considering other factors, when the labeling length is L=52mm, the Zui big labeling output can only be in the range of 400 pieces/min, not to mention the speed increase or the replacement of the longer label. .
In the domestic market, the general self-adhesive labeling machine product has a large delivery speed of 38m/min, while the company with technical strength sets the large delivery speed of the product to 70m/min. This indicator can explain: In the case of the original labeling output, it can also adapt to the label length change (lengthening); the high labeling speed is based on the technology of mechanical hardware quality, component high configuration and servo control, which is not manufactured by general manufacturers. It reflects the manufacturer's professional and technical standards.
(2) The printing speed of the self-adhesive labeling machine. For the labeling machine used in the pharmaceutical industry, it is especially important that the label can be printed on the batch number. Therefore, in the speed selection of the self-adhesive labeling machine for feeding and rolling, it is also necessary to consider the printing speed of the printing machine, and the smaller one can be counted as the actual labeling production capacity.
Printing batch numbers on self-adhesive labels are generally based on hot stamping in the pharmaceutical industry. Hot stamping is a technique in which a heated head prints text through a ribbon. Why is hot stamping the preferred method for printing adhesive labels for the pharmaceutical industry? Compared with the recent inkjet printing method, hot stamping has a low production cost and equipment maintenance cost for hot stamping printing; the other is that hot stamping does not occur when a similar part of the inkjet printing device prints the odor of the solvent. The circulation of the air conditioning system; the third is that the ribbon can be recycled and has an environmental side.
Although hot stamping has its own characteristics, it also has its weakness, that is, its printing speed is limited. The domestic hot stamping machine zui speed is generally 400 beats / min. After this value is printed, the text is not clear. Therefore, some people think that the high-yield self-adhesive labeling machine with hot stamping can only be set at 400 pieces/min. The self-adhesive labeling machine with more than 500 pieces/min will be equipped with inkjet printing.
3. From the perspective of special use, when choosing bottle labeling, it often encounters special use problems. For pharmaceutical production, it may encounter: (1) double-sided stickers; (2) similar plastic bottle surface due to demoulding The agent causes a decrease in the adhesion of the label or a "bubble" phenomenon on the surface of the label. This puts more special requirements on the selection of self-adhesive labeling machines.
3.1. Consideration should be given to the selection of double-sided stickers. For double-sided labeling of flat bottles, square bottles and round bottles, at least the following points should be considered: (1) The label head can realize multi-dimensional space adjustment to ensure The accuracy of labeling, such as the adjustment of 6-dimensional space; (2) the label head adopts double pressure roller design to improve the tension of the label to facilitate the labeling of long labels.
3.2. The labeling surface is prone to the problem of “bubble†problem. (1) The effect of static electricity should be eliminated. The static electricity ion fan can be used to electrostatically treat the bottle body, and the electrostatic brush is used to remove the static electricity of the label; (2) increase The labeling pressure of the label increases the adhesion between the label and the bottle as much as possible; (3) During the labeling process, the label is brought into line contact with the bottle as much as possible to completely remove the "bubble".
4. From the quality of labeling, the general recognized labeling quality requirements are as follows: (1) Labeling error ≤ ± 1mm, even if the coincidence position of the labeling is repeated repeatedly, this value can be reached; (2) Post-labeling and labeling The surface of the bottle should be fitted, it should be flat, no wrinkles, no "bubble" phenomenon; (3) The printed batch number is clearly legible, no overlap and blur, and the batch number error is <±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 and high precision of the rolling mechanism The processing is to ensure the line contact between the label and the surface of the bottle under the rolling pressure; (2) the high configuration requirement of the driving element, because the core of the feeding operation is a high-precision ultra-low inertia servo motor, to ensure the sticker Standard quality, the system applies closed-loop control, and the motor itself can correct its position at the same time to compensate itself; (3) Detection method and detection component are also the basis for ensuring the quality of labeling and labeling, and the manufacturer with technical strength In the past, the detection component only detected the imperfections caused by the label printing. Now the detection method is changed to the thickness measurement, which uses the thickness variation generated by the gap between the label and the label to control the servo electric operation. The current Zui good detection method, such reliability is greater; (4) to achieve perfect labeling, the control of the whole machine is also very critical, especially the bottle And the target speed of the feed. 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, requiring the running speed of the two to match; (5) component configuration, because today's high-speed labeling is established in the continuous operation of the machine. It requires all components to react quickly, and all actions are completed in an instant, which also requires the configuration of the detecting components. For example, labeling servo motor, labeling motor driver, conveyor motor, delivery motor, separation motor, inverter, labeling electric eye, label detection electric eye, delivery stop proximity switch, programmable controller, man-machine operation Interface components have configuration requirements.
5, label selection and printing settings 5.1, label selection The label used in the self-adhesive labeling machine is a roll, the quality of the label will directly affect the quality of the labeling, die cutting, slitting, static electricity and label printing process Dust treatment is also important.
Overview of domestic and foreign self-adhesive labeling machines, their working principles are similar, they are made by label peeling transfer and rolling paste, but it is not the same in control and manufacturing. The general self-adhesive labeling machine is composed of a labeling mechanism, a rolling mechanism, a hot stamping mechanism, a conveying mechanism, a transmission mechanism, a frame and a control system. Among them, the rolling mechanism is further divided into a roller rolling method suitable for a flat bottle and a rolling contact rolling method suitable for a round bottle. At the same time, the self-adhesive labeling machine is divided into vertical and horizontal according to the state of the bottle; low speed, medium speed and high speed according to the speed of the labeling; round bottles, flat bottles, square bottles, long bottles, etc. according to the characteristics of the container to be attached (alien The bottle is less in the pharmaceutical industry); it is divided into single-sided stickers and double-sided stickers according to the veneer requirements; general labels and transparent labels are classified according to the characteristics of the labels.
1. From the main function and control, the labeling position detected by the past self-adhesive labeling machine is based on the front edge of the bottle body. Because the bottles of different diameters need to be moved or the labeling time is changed. Without this change, it is not possible to ensure that the label is placed at the desired position of each bottle. Today's products feature the "automatically calculate label length" feature, which effectively compensates for these weaknesses. “Automatic calculation of label length†is an automatic control technology formed by the combination of PLC and servo motor technology. When the conveyor belt bottle detects the electric eye, the radius of the bottle is measured, and the zui bump on the outer edge of the bottle is taken as a sticker. The sensing point of the standard signal, that is, regardless of the diameter of the bottle, is the sensing point of the zui bump on the outer edge of the bottle, so that the distance between the electric eye and the peeling plate does not need to be mechanically adjusted. The standard time does not have to be adjusted at all. This is the automatic control principle of "automatically calculate the label length". This is also the preferred point for people to have the function of the self-adhesive labeling machine.
In the synchronization of the control speed, in addition to the above-mentioned "automatic calculation of the label length" function, the self-adhesive labeling machine should automatically complete the synchronous adjustment of the conveyor belt speed, the bidding speed, the bidding length, etc., which is also the same as the traditional The difference between the self-adhesive labeling machine is the guarantee of the quality stability of the labeling. The control speed of traditional self-adhesive labeling machines is adjusted by human experience, and the difficulty of artificial adjustment is that all movements are difficult to synchronize. If it is not synchronized, the labeling process will change frequently, resulting in poor labeling quality.
In the control system, the preferred (PLC+Human Machine Interface) control system is the main one. Compared with the earlier single-chip microcomputer (single board machine), using the general-purpose PLC as the main control device enables the PLC control system to achieve the following purposes: 1) It is more stable and more reliable; (2) It is more convenient to maintain in the future, and the upgrade is simpler; (3) It can be conveniently controlled online with the upper and lower stations.
In addition, it is necessary to consider adding a visual system that can detect, control and alarm real-time for the integrity of the print, the condition of the font, and whether the label after labeling is complete or not.
2, from the speed of delivery, printing speed and output, when choosing a self-adhesive labeling machine, people often only pay attention to the output of the labeling (that is, how many pieces can be attached per minute), but not comprehensively from the speed of labeling , printing speed, roll speed, etc. are considered simultaneously. Of course, the labeling output covers other indicators, but other speed indicators play a key role in the quality of use and production development. People can observe the advantages and disadvantages of each institution and potential mobility from its analysis, which is also the choice of stickers. The labeling machine should be comprehensively investigated.
(1) The speed of the labeling of the self-adhesive labeling machine is often not confirmed by the width of the label and the speed of printing when the output of the self-adhesive labeling machine is matched, only the high yield of the Zui in the manufacturer's sample It is also unreasonable to choose the indicator, because the high-yield indicator of the Zui given by the general manufacturer's sample is based on a certain label length and a certain printing method. Therefore, in the selection of the output of the self-adhesive labeling machine, the speed of the labeling should be investigated first. The relationship between the standard feeding speed and the labeling output is: Q=1000V/(L+a)
Among them: Q is the Zui big labeling output calculated by zui big delivery speed, piece/minute; V is the large delivery speed of zui, m/min; L is the length of a single label, mm; a is the spacing between labels, Mm.
For example, when labeling a diameter of φ 36 bottles, L = 52 mm, a = 3 mm, and V = 25 m / min, then Q = 454 pieces / min. That is, when you choose V=25m/min, considering other factors, when the labeling length is L=52mm, the Zui big labeling output can only be in the range of 400 pieces/min, not to mention the speed increase or the replacement of the longer label. .
In the domestic market, the general self-adhesive labeling machine product has a large delivery speed of 38m/min, while the company with technical strength sets the large delivery speed of the product to 70m/min. This indicator can explain: In the case of the original labeling output, it can also adapt to the label length change (lengthening); the high labeling speed is based on the technology of mechanical hardware quality, component high configuration and servo control, which is not manufactured by general manufacturers. It reflects the manufacturer's professional and technical standards.
(2) The printing speed of the self-adhesive labeling machine. For the labeling machine used in the pharmaceutical industry, it is especially important that the label can be printed on the batch number. Therefore, in the speed selection of the self-adhesive labeling machine for feeding and rolling, it is also necessary to consider the printing speed of the printing machine, and the smaller one can be counted as the actual labeling production capacity.
Printing batch numbers on self-adhesive labels are generally based on hot stamping in the pharmaceutical industry. Hot stamping is a technique in which a heated head prints text through a ribbon. Why is hot stamping the preferred method for printing adhesive labels for the pharmaceutical industry? Compared with the recent inkjet printing method, hot stamping has a low production cost and equipment maintenance cost for hot stamping printing; the other is that hot stamping does not occur when a similar part of the inkjet printing device prints the odor of the solvent. The circulation of the air conditioning system; the third is that the ribbon can be recycled and has an environmental side.
Although hot stamping has its own characteristics, it also has its weakness, that is, its printing speed is limited. The domestic hot stamping machine zui speed is generally 400 beats / min. After this value is printed, the text is not clear. Therefore, some people think that the high-yield self-adhesive labeling machine with hot stamping can only be set at 400 pieces/min. The self-adhesive labeling machine with more than 500 pieces/min will be equipped with inkjet printing.
3. From the perspective of special use, when choosing bottle labeling, it often encounters special use problems. For pharmaceutical production, it may encounter: (1) double-sided stickers; (2) similar plastic bottle surface due to demoulding The agent causes a decrease in the adhesion of the label or a "bubble" phenomenon on the surface of the label. This puts more special requirements on the selection of self-adhesive labeling machines.
3.1. Consideration should be given to the selection of double-sided stickers. For double-sided labeling of flat bottles, square bottles and round bottles, at least the following points should be considered: (1) The label head can realize multi-dimensional space adjustment to ensure The accuracy of labeling, such as the adjustment of 6-dimensional space; (2) the label head adopts double pressure roller design to improve the tension of the label to facilitate the labeling of long labels.
3.2. The labeling surface is prone to the problem of “bubble†problem. (1) The effect of static electricity should be eliminated. The static electricity ion fan can be used to electrostatically treat the bottle body, and the electrostatic brush is used to remove the static electricity of the label; (2) increase The labeling pressure of the label increases the adhesion between the label and the bottle as much as possible; (3) During the labeling process, the label is brought into line contact with the bottle as much as possible to completely remove the "bubble".
4. From the quality of labeling, the general recognized labeling quality requirements are as follows: (1) Labeling error ≤ ± 1mm, even if the coincidence position of the labeling is repeated repeatedly, this value can be reached; (2) Post-labeling and labeling The surface of the bottle should be fitted, it should be flat, no wrinkles, no "bubble" phenomenon; (3) The printed batch number is clearly legible, no overlap and blur, and the batch number error is <±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 and high precision of the rolling mechanism The processing is to ensure the line contact between the label and the surface of the bottle under the rolling pressure; (2) the high configuration requirement of the driving element, because the core of the feeding operation is a high-precision ultra-low inertia servo motor, to ensure the sticker Standard quality, the system applies closed-loop control, and the motor itself can correct its position at the same time to compensate itself; (3) Detection method and detection component are also the basis for ensuring the quality of labeling and labeling, and the manufacturer with technical strength In the past, the detection component only detected the imperfections caused by the label printing. Now the detection method is changed to the thickness measurement, which uses the thickness variation generated by the gap between the label and the label to control the servo electric operation. The current Zui good detection method, such reliability is greater; (4) to achieve perfect labeling, the control of the whole machine is also very critical, especially the bottle And the target speed of the feed. 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, requiring the running speed of the two to match; (5) component configuration, because today's high-speed labeling is established in the continuous operation of the machine. It requires all components to react quickly, and all actions are completed in an instant, which also requires the configuration of the detecting components. For example, labeling servo motor, labeling motor driver, conveyor motor, delivery motor, separation motor, inverter, labeling electric eye, label detection electric eye, delivery stop proximity switch, programmable controller, man-machine operation Interface components have configuration requirements.
5, label selection and printing settings 5.1, label selection The label used in the self-adhesive labeling machine is a roll, the quality of the label will directly affect the quality of the labeling, die cutting, slitting, static electricity and label printing process Dust treatment is also important.
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