The so-called flexible packaging refers to a package whose shape can be changed after the contents are filled or removed. Pharmaceutical foil blister packaging is one of the shapes of flexible packaging. The aluminum foil printing and coating process is carried out on a special aluminum foil printing and coating machine. The current equipment performance has gradually formed the mechanization and automation of modern packaging. The core of the entire equipment control is the tension control system. The control part of the unwinding tension of the aluminum foil adopts the magnetic powder tension brake, and the control part of the winding tension is equipped with a magnetic powder tension clutch. The tension control of the printing and coating stations is also equipped with a synchronous tension clutch control, and the tension change is detected in the device. The general control methods are as follows: ![]()
1. Pharmaceutical aluminum foil printing coating tension detection control method 1.1 Stand-type counter roller sensor tension detection control device: In the unwinding tension control system of aluminum foil printing and coating machine, mainly by electromagnetic speed regulating motor, magnetic powder tension traction brake And guide roller sensor detection composition, and the central control unit constitutes the integral and proportional adjustment control. The seat type guide roller sensor tension detection device is shown in FIG. 1 . The advantage of this type of tension detection is that the structure is simple and easy to install, but the disadvantage is due to the manufacturing precision of the device. When the aluminum foil is accidentally caused to shake, the sensor mistakenly believes that when the tension suddenly changes, the tension will be wrongly controlled. Unstable foil tension.
1.2 floating roller tension detection control device: as shown in Figure 2. The principle of tension detection is as follows: roller 3 is a floating roller, and 1 and 2 are guide rollers. Aluminum foil moves in the direction of the figure. Roll 1 rotates at a constant speed (corresponding to the movement speed of aluminum foil). Roll 3 rotates along with gravity. The line floats and there is no relative sliding between the aluminum foil and the roller surface. The aluminum foil between roller 2 and roller 3 is 4, the aluminum foil between roller 1 and roller 3 is 5, and the aluminum foil between 4 and 5 is parallel to each other and perpendicular to the horizontal plane. When the tension suddenly increases, the increase in tension causes a decrease in the rotation speed of the roller 3 and causes the roller 3 to float upward. The decrease in the rotation speed of the roller 3 causes the tension to increase, and the roller 3 floats, resulting in a tension of 5 degrees. To reduce, the influence of the two on the 5 tension is just the opposite. The same effect is the opposite. The rate at which the speed of rotation of the roller 3 increases or decreases is proportional to the magnitude of its moment of inertia. The acceleration value of the roller 3 floating up or down is proportional to the magnitude of its inertial mass. Therefore, properly selecting the moment of inertia and the inertial mass of the roller 3 can minimize the influence of the jitter of 4 tension on the 5 tension, which is the floating roller. Deflection of aluminum foil tension disturbance inertia. Due to the change of tension, the position of the floating roller is caused to change. After the detection device connected with the floating roller detects this signal, it feeds back to the tension control system and uses the magnetic powder brake magnetic powder clutch so that the floating roller is always in the movable range. The center position maintains tension stability.
1.3 Cylinder Control Roller Type Tension Detection Control Device: The guide roller 12 is fixed. When the tension is stable, the tension of the aluminum foil and the force of the cylinder make the guide roller 3 in the middle position. When the tension changes, the tension of the guide roller 3 in the aluminum foil and The cylinder force oscillates through the center of the gear 1 through the swing rod. The swing of the guide roller can not only obviously reflect the change of the aluminum foil tension and heat, but also can partially stabilize the tension by changing the length of the aluminum foil, especially eliminating the The poor precision of equipment manufacturing has caused the foil to be tampered with and mistakenly believed that the tension has changed greatly. The gear 1 and the pendulum rod are fixed together to drive the gear 2 to rotate. The gear 2 is connected to a potentiometer, which controls the speed of the electromagnetic speed regulating motor. , reach the stable state of tension.![]()
According to the principle of the above three kinds of aluminum foil tension control methods, it can be seen that the control method of the pedestal type guide wheel sensor is limited to the displacement of the sensor and is only applicable to the printing material with less distortion, and the best tension control system The configuration is to control the roll-type tension detection device controlled by the unwinding output and rewinding cylinder or to control the floating roller by the moving configuration.
1.4 Principles for Setting the Automatic Tensile Attenuation Value of Aluminum Foil: The automatic tension control and manual tension control are the tension control during the operation of the aluminum foil printing and coating machine. The automatic tension control system is a preset tension attenuation value, and the device maintains the tension value throughout the operation; the manual tension control requires the operator to continuously adjust according to the specific conditions of the weight of the equipment and materials, so as to meet the material requirements during operation. Needed tension. When setting the automatic tension operation, you should set the initial tension first, and then set the tension attenuation value. Take the winding tension attenuation value as an example. The principle of setting is: the attenuation value (%) is equal to the tension reduction of the end of the aluminum foil winding. After the initial tension is removed and then divided by the initial tension, the resulting quotient is multiplied by 100%. When setting the automatic tension value of the winding, it should be noted that the setting value of the tension should not be too large, or the hardness of the aluminum foil winding is large, and the edge curling phenomenon easily occurs. However, the tension is too small, the rewinding body is too loose, and the winding is not easy to run.
2. Factors influencing the change of coating tension value of aluminum foil printing 2.1 Accuracy of the device guide roller. If the precision of the guide roller processing in the equipment is poor, the stability of the aluminum foil tension cannot be ensured, thereby affecting the printing and coating effect. The overall requirements for the guide roller are: a. The roller and the roller must be parallel to each other. The circular runout of the guide roller cannot be too large and the run-out is too large. The tension of the printing material will occur with the rotation of the guide roller. The change of rules. b, guide roller balance problem. The balance is not good, the speed of the guide roller will change every moment in one week. The requirements for the guide roller balance are: the outside diameter is not more than 5 grams, and the manual guide roller is used. After the hand is released, the guide roller rotates for a long time and is stopped by hand. It can stop at any position. The guide roller should be light and the moment of inertia should be as small as possible to match the speed of the main unit.
2.2 The influence of the quality of aluminum foil raw materials. The constant variation of the dynamic tension of the actual aluminum foil roll during the printing process can cause tension fluctuations. The material quality of the material itself is not uniform, which will cause fluctuations in the tension. The heavier the material, the faster the mechanical pulling starts, the greater the tension applied, the heavier the material, the faster the speed change, and the tension change. The faster, the greater the error in the print coloration caused by this reason.
2.3 Impact of equipment operating speed: When the speed of the main motor of the equipment changes, the aluminum foil tension of the unwinding traction to the winding section is firstly changed instantaneously, and a small amount of vibration of the aluminum foil is required for a period of time to gradually balance the tension. The instability will directly affect the quality of the printed register accuracy.
2.4 Printing coating adhesive concentration, thickness of the tension. The tension of the aluminum foil in the printing and coating process is related to the adhesiveness of the adhesive, the thickness of the coating, and the coating speed. The greater the adhesiveness and the thickness of the coating, the smaller the tension of the printed aluminum foil, and the smaller the adhesive twist and the thickness of the coating, the greater the coating tension. Therefore, in the process of printing and coating aluminum foil, controlling the tension should grasp the speed, the thickness of the thick coating of the adhesive, and the drying temperature. The cooperation between them is not good, it appears in the aluminum foil above the winding does not appear tight, the whole roll has the phenomenon of relaxation, reflected in the most obvious at both ends of the foil, often the middle part is tight, the exposed parts of both sides due to tension Uneven and wrinkling, so tension should be applied evenly when winding, in order to make the compaction and compaction, to avoid the appearance of aluminum foil relaxation phenomenon.
1. Pharmaceutical aluminum foil printing coating tension detection control method 1.1 Stand-type counter roller sensor tension detection control device: In the unwinding tension control system of aluminum foil printing and coating machine, mainly by electromagnetic speed regulating motor, magnetic powder tension traction brake And guide roller sensor detection composition, and the central control unit constitutes the integral and proportional adjustment control. The seat type guide roller sensor tension detection device is shown in FIG. 1 . The advantage of this type of tension detection is that the structure is simple and easy to install, but the disadvantage is due to the manufacturing precision of the device. When the aluminum foil is accidentally caused to shake, the sensor mistakenly believes that when the tension suddenly changes, the tension will be wrongly controlled. Unstable foil tension.
1.2 floating roller tension detection control device: as shown in Figure 2. The principle of tension detection is as follows: roller 3 is a floating roller, and 1 and 2 are guide rollers. Aluminum foil moves in the direction of the figure. Roll 1 rotates at a constant speed (corresponding to the movement speed of aluminum foil). Roll 3 rotates along with gravity. The line floats and there is no relative sliding between the aluminum foil and the roller surface. The aluminum foil between roller 2 and roller 3 is 4, the aluminum foil between roller 1 and roller 3 is 5, and the aluminum foil between 4 and 5 is parallel to each other and perpendicular to the horizontal plane. When the tension suddenly increases, the increase in tension causes a decrease in the rotation speed of the roller 3 and causes the roller 3 to float upward. The decrease in the rotation speed of the roller 3 causes the tension to increase, and the roller 3 floats, resulting in a tension of 5 degrees. To reduce, the influence of the two on the 5 tension is just the opposite. The same effect is the opposite. The rate at which the speed of rotation of the roller 3 increases or decreases is proportional to the magnitude of its moment of inertia. The acceleration value of the roller 3 floating up or down is proportional to the magnitude of its inertial mass. Therefore, properly selecting the moment of inertia and the inertial mass of the roller 3 can minimize the influence of the jitter of 4 tension on the 5 tension, which is the floating roller. Deflection of aluminum foil tension disturbance inertia. Due to the change of tension, the position of the floating roller is caused to change. After the detection device connected with the floating roller detects this signal, it feeds back to the tension control system and uses the magnetic powder brake magnetic powder clutch so that the floating roller is always in the movable range. The center position maintains tension stability.
1.3 Cylinder Control Roller Type Tension Detection Control Device: The guide roller 12 is fixed. When the tension is stable, the tension of the aluminum foil and the force of the cylinder make the guide roller 3 in the middle position. When the tension changes, the tension of the guide roller 3 in the aluminum foil and The cylinder force oscillates through the center of the gear 1 through the swing rod. The swing of the guide roller can not only obviously reflect the change of the aluminum foil tension and heat, but also can partially stabilize the tension by changing the length of the aluminum foil, especially eliminating the The poor precision of equipment manufacturing has caused the foil to be tampered with and mistakenly believed that the tension has changed greatly. The gear 1 and the pendulum rod are fixed together to drive the gear 2 to rotate. The gear 2 is connected to a potentiometer, which controls the speed of the electromagnetic speed regulating motor. , reach the stable state of tension.
According to the principle of the above three kinds of aluminum foil tension control methods, it can be seen that the control method of the pedestal type guide wheel sensor is limited to the displacement of the sensor and is only applicable to the printing material with less distortion, and the best tension control system The configuration is to control the roll-type tension detection device controlled by the unwinding output and rewinding cylinder or to control the floating roller by the moving configuration.
1.4 Principles for Setting the Automatic Tensile Attenuation Value of Aluminum Foil: The automatic tension control and manual tension control are the tension control during the operation of the aluminum foil printing and coating machine. The automatic tension control system is a preset tension attenuation value, and the device maintains the tension value throughout the operation; the manual tension control requires the operator to continuously adjust according to the specific conditions of the weight of the equipment and materials, so as to meet the material requirements during operation. Needed tension. When setting the automatic tension operation, you should set the initial tension first, and then set the tension attenuation value. Take the winding tension attenuation value as an example. The principle of setting is: the attenuation value (%) is equal to the tension reduction of the end of the aluminum foil winding. After the initial tension is removed and then divided by the initial tension, the resulting quotient is multiplied by 100%. When setting the automatic tension value of the winding, it should be noted that the setting value of the tension should not be too large, or the hardness of the aluminum foil winding is large, and the edge curling phenomenon easily occurs. However, the tension is too small, the rewinding body is too loose, and the winding is not easy to run.
2. Factors influencing the change of coating tension value of aluminum foil printing 2.1 Accuracy of the device guide roller. If the precision of the guide roller processing in the equipment is poor, the stability of the aluminum foil tension cannot be ensured, thereby affecting the printing and coating effect. The overall requirements for the guide roller are: a. The roller and the roller must be parallel to each other. The circular runout of the guide roller cannot be too large and the run-out is too large. The tension of the printing material will occur with the rotation of the guide roller. The change of rules. b, guide roller balance problem. The balance is not good, the speed of the guide roller will change every moment in one week. The requirements for the guide roller balance are: the outside diameter is not more than 5 grams, and the manual guide roller is used. After the hand is released, the guide roller rotates for a long time and is stopped by hand. It can stop at any position. The guide roller should be light and the moment of inertia should be as small as possible to match the speed of the main unit.
2.2 The influence of the quality of aluminum foil raw materials. The constant variation of the dynamic tension of the actual aluminum foil roll during the printing process can cause tension fluctuations. The material quality of the material itself is not uniform, which will cause fluctuations in the tension. The heavier the material, the faster the mechanical pulling starts, the greater the tension applied, the heavier the material, the faster the speed change, and the tension change. The faster, the greater the error in the print coloration caused by this reason.
2.3 Impact of equipment operating speed: When the speed of the main motor of the equipment changes, the aluminum foil tension of the unwinding traction to the winding section is firstly changed instantaneously, and a small amount of vibration of the aluminum foil is required for a period of time to gradually balance the tension. The instability will directly affect the quality of the printed register accuracy.
2.4 Printing coating adhesive concentration, thickness of the tension. The tension of the aluminum foil in the printing and coating process is related to the adhesiveness of the adhesive, the thickness of the coating, and the coating speed. The greater the adhesiveness and the thickness of the coating, the smaller the tension of the printed aluminum foil, and the smaller the adhesive twist and the thickness of the coating, the greater the coating tension. Therefore, in the process of printing and coating aluminum foil, controlling the tension should grasp the speed, the thickness of the thick coating of the adhesive, and the drying temperature. The cooperation between them is not good, it appears in the aluminum foil above the winding does not appear tight, the whole roll has the phenomenon of relaxation, reflected in the most obvious at both ends of the foil, often the middle part is tight, the exposed parts of both sides due to tension Uneven and wrinkling, so tension should be applied evenly when winding, in order to make the compaction and compaction, to avoid the appearance of aluminum foil relaxation phenomenon.
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