After the aluminum foil for pharmaceutical packaging is processed on a dedicated aluminum foil printing and coating machine, the semi-finished product needs to be cut on the slitting machine, and its length, width, and weight should be determined according to the relevant standards. At present, the performance technology of post-printing and slitting machines in foreign countries is superior to that in China, mainly in the following aspects: first, advanced equipment technology, mainly in the use of shaftless unwinding of raw materials, photoelectric correction of pneumatic braking, and the use of an independent center for rewinding The roll is equipped with two upper and lower friction winding shafts. The winding shaft adopts a special structure and is composed of an airbag felt strip and many friction rings. The winding paper core is fixed on the friction ring, and there is no contact pressure between the friction rings, which can ensure that multiple volumes of aluminum foil products are collected on the same shaft. The control system of the slitting machine adopts the latest DLC and touch screen. It has automatic control functions such as inertia and friction air pressure calculation working speed winding tension characteristic curve calculation. When pLC calculates the winding tension, factors such as diameter, speed, and rotational inertia are comprehensively considered to ensure accurate tension control, stability, and fault display function, and easy operation. Secondly, the cutting speed is high, the cutting speed is as high as 300 ~ 400m / min, and is equipped with a special unwinding device, which is convenient for loading and unloading, time-saving, high production efficiency, and high degree of automation. The operation of the slitting machine is basically completed on the touch screen, and the repeatability is good, eliminating the influence of human factors such as the operator's experience and skills. One machine has multiple uses. About 20,000 winding tension diameter characteristic curves and winding tension speed characteristic curves are stored in the machine for selection. After selecting the sheet and setting various parameters, the winding tension is automatically controlled. Therefore, the machine has wide adaptability. In addition to slitting aluminum foil, it is also suitable for slitting PE, pp, pvc and other plastic films to meet the needs of slitting products in different industries. Compared with foreign equipment, the domestic medical aluminum foil slitting machine is still at a relatively low technical level, mainly shown in these aspects: the slitting speed is low, the nominal maximum speed of the general domestic machine is 180m / mim, and the actual speed is less than The speed. The quality of slitting and winding is unstable. Due to the backward control mode of the domestic machine, low control accuracy, poor stability and repeatability, the winding quality during slitting is unstable, and it is highly dependent on the experience and skills of the operator. When slitting products with different widths, the length of winding can not be accurately guaranteed. However, after the efforts in recent years, with the rapid development of China's pharmaceutical packaging and market changes, the production capacity of slitting equipment has been continuously enhanced, and the product quality needs to be further improved. According to the current situation of use, summarize the use of various manufacturers Regarding the performance requirements of the slitter, it needs to be re-elected in the following aspects: ①To increase the production capacity of the slitter. Generally, the diameter of unwinding is about 1000 mm, and the diameter of rewinding can reach 600 mm; ⑦Improve the cutting speed. On the basis of the current cutting speed, it is increased to 200 ～ 300 / min. Increasing the cutting speed is the main way to increase production capacity, and high speed is one of the main means for enterprises to increase production and reduce costs; ③ easy to operate. The increase in the diameter of the original roll is labor-intensive for the operator, and the equipment must be required to reduce the labor intensity. The unwinding system is divided into shaft unwinding and shaftless unwinding. Generally speaking, shaftless unwinding is convenient for winding and clamping. As long as a lifting truck is used, both winding and unwinding can be used to achieve the purpose of reducing labor intensity. Control operations must also be simple and intuitive, such as setting tension, tension curve, unwinding diameter, slitting material and thickness, and winding width, length and other parameters can be achieved through simple operation, using equipment accuracy to ensure the quality of winding, Eliminate the influence of human factors; ④ The equipment is safe and reliable. When the equipment is running at a high speed, the safety of the operator and the safety of the movement sequence of the equipment must be guaranteed. The correction instrument is sensitive to ensure that the edge of the aluminum foil roll is neat and error-free. The meter number setting is stable to ensure that the deviation of the winding length is within a certain tolerance range. After printing and coating, the aluminum foil needs to be post-printed and slitted on the slitting machine to cut the large roll of semi-finished products into the required size. Running the semi-finished products on the slitting machine is a process of unwinding and rewinding. This process includes two parts: machine speed control and tension control. The so-called tension is to pull the aluminum foil and roll it onto the core according to the standard. A certain stretching and tensioning force must be applied to the aluminum foil. The control force for tensioning the aluminum foil is the tension. Tension control refers to the ability to permanently control the tension of aluminum foil when it is conveyed on the equipment. This control must be effective for any running speed of the machine, including the acceleration, deceleration and uniform speed of the machine. Even in an emergency stop situation, it has the ability to ensure that the aluminum foil is not damaged at all. The tension control of slitting machine is basically manual tension control and automatic tension control. Manual tension control means that during the winding or unwinding process, when the roll diameter changes to a certain stage, the operator adjusts the manual power supply device to achieve the purpose of controlling the tension. Full-automatic tension control is to measure the actual tension value of the material belt directly by the tension sensor, and then convert the tension data into a tension signal and feed it back to the tension controller. Through this signal and the preset tension value of the controller, the control signal is calculated. Automatically control the execution unit to make the actual tension value equal to the preset tension value to achieve the purpose of stabilizing tension. The size of the equipment winding and unwinding tension setting directly affects the yield of the product. The tension is too large and the winding is too tight. The aluminum foil is prone to wrinkle I. The tension is insufficient. The aluminum foil is prone to slip on the roll. Unloading and causing the unwinding shaft to swing greatly during slitting, which affects the slitting quality, so the slitter must have a good tension detection system. 1. Slitting machine unwinding tension detection system: (1) Tension sensor detection It is a direct detection of tension, which is closely integrated with the machine and has a detection method of moving parts. Usually two sensors are used in pairs, and they are installed on the end shafts on both sides of the detection guide roller. By detecting the applied load on both sides of the guide roller, the material belt causes displacement or deformation of the tension sensor sensitive element, thereby detecting the actual tension value, and converting this tension data into a tension signal and feeding it back to the tension controller. (2) Indirect tension detection system of floating roller: a set of floating roller is installed in front of the aluminum foil tracking roller, and the position of the floating roller is detected by a potentiometer. The method of tension control is to keep the tension constant by keeping the position of the floating roller unchanged; (3) Use the magnetic powder clutch to control the rotational torque of the input winding roller to achieve tension control: the magnetic powder clutch is composed of an active part and a driven part, connected to the winding roller through a universal coupling and other transmission mechanisms, and filled with fine iron in the middle Magnetic powder acts as a torque transmission medium. A certain current flows into the exciting coil to form a magnetic field, and the magnetic powder is magnetized. The magnetized magnetic powder attracts each other to form a chain-like arrangement. When the active part rotates at a constant speed, the coupling force between the magnetic powder is destroyed to form a circumferential tangential force. The product of this tangential force and the radius of the magnetic powder circle is the driven driven part The revolving torque can realize the coupling of the output torque from the active part to the driven part in the continuous rotation, so as to achieve the purpose of controlling the tension: (4) The cutting and unwinding capacity and speed tension detection system mainly uses magnetic powder tension braking to control the unwinding speed. Its working principle is that a coupling is installed in the magnetic powder brake, as well as input components and outputs with magnetic coils. component. Below the magnetic coil is an annular groove, and below the groove is an annular rotor or output member. The annular groove is located in the center of the output part, and the groove is filled with magnetic powder. When there is an excitation current in the magnetic coil, the coil generates magnetic flux to align the magnetic powder in the direction of the magnetic field, which creates damping between the input part and the output part and transmits the magnitude of the torque. If you increase or decrease the tension and speed applied to the aluminum foil, as long as you change the magnitude of the excitation current, or the current or voltage value applied to the coupling coil by the amplifier, you can effectively control the magnitude of tension and speed. 2. The attenuation and tension compensation of the tension of the slitter rewinding and unwinding: It is generally believed that keeping the aluminum foil tension constant when the aluminum foil is rewinding and unwinding is beneficial to the performance of the finished aluminum foil, but it is not. The best way is to increase the tension of the aluminum foil according to a certain rule as the diameter or weight of the roll increases, and the smaller the diameter and weight, the smaller the tension value. Because there are automatic tension control and manual tension control in the slitting operation. Manual tension control requires the operator to continuously adjust according to the diameter and weight of the masterbatch. As shown in the following table: The automatic tension control system pre-sets the tension attenuation value, and the equipment is attenuated according to the change of the material roll during the operation. When setting the automatic tension operation, you should set the initial tension first, and then set the tension attenuation value. Taking the attenuation value of the slit aluminum foil unwinding as an example, the setting principle is: the aluminum foil tension attenuation value (%) is equal to the tension at the end of the winding of the aluminum foil minus the initial tension and then divided by the initial tension, and the quotient is multiplied by 100%. When setting the automatic tension value, it should not be too large, otherwise the surface hardness of the aluminum foil winding is large, and the edge curling phenomenon is easy to occur, but the tension should not be too small, too small, it is easy to cause the rewinding body to be too loose, and the winding is not neat. Therefore, the quality of the rewinding and unwinding during the aluminum foil slitting operation is mainly affected by the change of the aluminum foil tension. It can be seen that the mastery of the rewinding and unwinding control system is the key to affecting the quality. 3. The standard requirements for the cutting quality of aluminum foil after printing. The appearance quality requires that the surface of the cutting aluminum foil is clean, smooth, and evenly coated. The rolling surface and the end surface of the cutting aluminum foil should be tightly wrapped, and the end surface should be flat. The loose layer or tube core is free to fall off, and the cutting length of aluminum foil should be controlled within 1000 meters ± 2%. The number of joints per roll is less than or equal to 3/1000 meters. The flatness of the cut surface of the winding is less than 1 mm. 4. The speed change during slitting affects the tension change: when the speed is increased or decelerated, the main motor speed changes, which first causes the instantaneous change in the tension of the aluminum foil from the unwinding traction to the winding section, and the aluminum foil must vibrate slightly after a period of time to gradually make the tension smooth. Because the operation speed of the equipment is operated by people during the slitting operation, the speed of the operation will affect the flatness of the end surface of the aluminum foil after slitting. Therefore, the rapid speed-up operation is adopted during the slitting operation, that is, it will reach the machine in a few seconds. The maximum speed per hour, the tension changes greatly at this time, and when other problems occur, it needs to be shut down in a hurry to deal with it. It is often buried with hidden quality problems. Another operation is to gradually increase the speed, also known as section speed increase: the beginning is 30-50 meters / minute , Gradually increase the speed to 80-100m / min, and finally reach the maximum speed of the machine. It is called soft start, which is conducive to the stability of tension. Although the cutting end face has a speed-up interface, the cutting face is flat. 5. The reasonable installation of the slitting knife affects the quality: after the aluminum foil is printed, different specifications and sizes are required, and the slitting machine needs to be slitted. The slitting knife is a circular knife and a circular pad type, which is called a shearing knife. Because the cutting edge is precisely processed on the outer surface of a circular ring as required, when the upper and lower rollers rotate one turn, the slitting line will work once. For each knife point, it will participate in the cutting under the rotation of the knife Object contact. Its working principle is similar to a pair of scissors, through the two opposite blades of the upper and lower rollers, to achieve the effect of cutting aluminum foil. When slitting, the gap between the upper and lower blades is large, the aluminum foil is not easy to cut, and occasionally it can be cut, and the uneven end surface is obvious. The gap between the upper and lower blades is small, and the vertical texture appears on the surface of the aluminum foil. Generally, when the tool is installed before cutting, the gap between the cutting lines is adjusted to 0, 20-0, 0.3mm. In order to ensure that the end surface of the aluminum foil is flat, this is because in the aluminum foil slitting process, the aluminum foil rebound and impact can reduce the metal collision and contact of the upper and lower knife rollers. From the cross section of the tool, it can be seen that the lower roller knife is used for slitting One side, thus improving the mechanical strength of the knife edge, as long as the use is reasonable, the knife edge collapse phenomenon rarely occurs. 6. Accuracy of the tension detection roller of the slitter: If the processing accuracy of the detection roller is poor during operation, the stability of the aluminum foil slitting tension cannot be guaranteed, which will affect the quality of the product. The overall requirement for the detection roller is that the round runout of the roll during processing cannot be too large, the runout is too large, and the tension of the aluminum foil will change irregularly as the roll rotates. In addition, the balance of the rollers is not well-balanced, and the rotation speed of the rollers changes within a week. The requirements for roller balance are: the overweight at the outer diameter should exceed 5 grams. Turn the guide roller by hand. After the hand is released, the rotation of the guide roller is stable to stop it. It can be stopped at any position. The weight of the roller must be Keep it as small as possible to keep it consistent with the speed of the machine. To sum up, when slitting medicinal aluminum foil, we must first select the advanced model, and pay attention to understand the characteristics of the winding and unwinding tension detection control system used in the equipment during operation, and formulate reasonable for the aluminum foil material used The tension and the tension attenuation and compensation during the unwinding and unwinding process are used to realize the soft start and soft stop of the equipment tension to prevent quality problems. During the slitting operation, attention should always be paid to the change in the tension of the aluminum foil rewinding and unwinding, because it is affected by the changes in material quality, weight, thickness uniformity, and slitting speed. When setting the rewinding and unwinding tension, it must be consistent with these characteristics of the aluminum foil adapt. In order to ensure the accuracy of the tension of the unwinding and unwinding, when the tension detection roller of the unwinding and unwinding mechanism should be higher than the maximum speed, dynamic balancing treatment should be carried out, and the surface should have enough wrap angles during use to provide accurate running tension. Ensure the stability of product quality. Automatic Hair Curler,Hair Curler Wand,Cordless Hair Curler,2 Inch Curling Iron Ningbo Chuangxiang Electrical Appliance Co.,Ltd , https://www.hshaircurler.com
Aluminum foil cutting weight (kg) Manual control power supply voltage value (V) Actual tension value (N) 30 5 15-20 60 6 20-25 90 6.5 25-30 120 7 30-35 150 7.5 35-40 180 8 40- 45 210 8.5 45-50