Characteristics of the hottest aluminum foil print

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Characteristics of aluminum foil printing equipment and auxiliary machinery configuration

in recent years, China's pharmaceutical packaging has developed rapidly, among which the aluminum foil printing blister packaging of tablets and capsules is popular with consumers. The aluminum foil blister has the advantages of good protection, light weight, small storage space, convenient transportation and fast production speed. In order to meet the market demand, some enterprises are ready to use pharmaceutical aluminum foil printing machine (also known as pharmaceutical aluminum foil printing coater). How to choose medical aluminum foil printing equipment and its supporting machinery, I think we must consider these aspects: first, equipment performance; Second, process configuration; Third, mechanical structure. This article will discuss and exchange with you on these issues

I. performance parameter requirements

1. Printing width: Generally speaking, the wider the width of aluminum foil, the higher the production efficiency and the larger the investment. At present, the printing width of the equipment ranges from 600mm to 1000mm, which can be determined according to the situation of the product. Generally, a certain amount of slitting allowance shall be reserved according to the maximum width of aluminum foil compression allowed by the drug blister packaging machine in order to cut out the required size

2. Printing speed: it is the main parameter to measure the grade of aluminum foil printing machine. Generally, the printing speed of domestic machines is 35 ~ 50M/min for simple low-grade machines, 50 ~ 80mm/min for medium-grade machines, and more than 80 ~ 100M/min for high-grade machines

3. Automatic registration accuracy and its control: this performance index is also one of the main parameters to measure the grade of printing machine. Low grade equipment is not equipped with a registration system, and its printing accuracy is generally about ± 0.5mm. The registration accuracy of domestic printing machines equipped with automatic registration system can reach about ± 0.2 ~ 0.25mm. When the printing speed exceeds 50 ~ 100 m/min, the automatic registration control system is an important control means to ensure the printing quality, which is essential. At present, there are two scanning registration and tracking systems: the same reference and different reference (also known as absolute reference and relative reference). The so-called "different reference" refers to the tracking and registration of all subsequent color groups with the gauge line of the previous color as the reference. "Same reference" refers to that all subsequent color decks track and register based on the gauge line of the first color. The former is widely used and suitable for sensitive materials. The latter method can generally obtain higher overprint accuracy. Most of the registration systems only have one of these properties, and the registration system with two properties should be preferred when selecting a printing machine

4. Printing color number: printing color number includes monochrome, two-color and multi-color (more than 3 colors), with 3 ~ 4 colors as the majority in recent years. It can be determined as needed

5. Qualified rate of printing products: it is also an important index. Generally, the qualified rate of low-grade printing machines is 85% - 90%, and that of medium and high-grade printing machines can reach more than 90%

6. Other parameters: the maximum diameter of the discharging and receiving roll, the diameter of the plate roll, steam heating or electric heating, the amount of steam consumed, the power of the whole machine, the amount of cold water, the amount of compressed air, the overall dimensions of the machine, the total weight and height of the equipment are all considered

II. Process configuration requirements

1. Coating process configuration:

the configuration of each station of different grades of aluminum foil printing machine is different. The configuration of low-grade monochrome printing machine is (1) aluminum foil unwinding  aluminum foil printing  aluminum foil drying  aluminum foil front coated with protective agent  aluminum foil drying  aluminum foil winding. (2) Aluminum foil unwinding  coating adhesive on the reverse side of aluminum foil  aluminum foil drying  aluminum foil winding  slitting on the slitter to the required specifications. In the above configuration, since the drying channel of the equipment is single-layer, the aluminum foil needs secondary processing to complete the whole production process. Low production efficiency and yield. Another process configuration is: aluminum foil unwinding  aluminum foil printing (3-4 colors) and drying  coating protective agent on the front of aluminum foil  drying  coating adhesive on aluminum foil  drying  aluminum foil reeling  unloading, cutting into required specifications and packaging. This process configuration adopts double-layer baking channel electric heating, and the aluminum foil is processed at one time on the equipment, so the production efficiency is high

2. Slitter configuration: aluminum foil needs to be cut into finished products of certain specifications on the slitter after being processed by the printing machine. The configuration points of the slitter are (1) there is sufficient production capacity. Generally, the unwinding diameter of the slitter is about 2000 mm, and the slitting speed should match the printing speed, or higher, so as to improve the output and reduce the cost. (2) The operation is convenient and intuitive. For example, setting tension, tension curve, unwinding diameter, thickness of slitting material, rewinding width, length and other parameters can be achieved through simple operation, using equipment to ensure product quality and eliminate the influence of human factors. (3) Safe and reliable: the equipment shall ensure the safety of operators and the safety of equipment action sequence. The deviation corrector shall be sensitive, with moderate winding tightness, flat end face, uniform surface hardness, and free of defects such as staggered layers, wrinkles and depressions. The setting of the counter should be stable to ensure that the deviation of the winding length is within a certain tolerance. (4) Advanced equipment control technology: the advanced Slitter control system has adopted a new programmable controller PLC and touch screen, which has automatic control functions such as inertia and friction air pressure calculation of winding diameter and winding tension characteristic curve, working speed and winding tension characteristic curve calculation. When applying PLC to calculate winding tension, the diameter, speed, moment of inertia and other factors are comprehensively considered, It can ensure that the winding tension control is accurate and stable, and has the function of fault display

III. structural configuration requirements:

1. Configuration of power system structure: low grade aluminum foil printing machines generally adopt electromagnetic slip speed regulation system, which has simple control and low cost, but there are some problems. First, the reliability of the adjustment controller is poor, and the main components such as the op amp are often damaged. The common fault is "runaway" -- the high-speed operation of the machine in the out of control state. Second, the speed regulation performance is poor, especially in low-speed operation, the speed is unstable, the torque is small, and there is a runaway zone. Third, low-speed operation has large energy consumption and low efficiency. Therefore, the electromagnetic slip speed regulation system can not meet the requirements of the speed regulation performance of today's aluminum foil printing press. At present, the electric drive system of aluminum foil printing machine adopts frequency conversion speed regulation system. This system is analyzed according to the speed relationship of asynchronous motor n = 60fl/P (1-s) (n-rotor rotation, FL stator power frequency, P-pole pair, s-slip). When the pole pair P is constant, the motor rotor speed n is directly proportional to the stator power frequency fl, Therefore, continuously changing the frequency of the motor power supply can continuously and smoothly adjust the speed of the motor. Asynchronous motor variable frequency speed regulation has the advantages of wide range, high smoothness and hard mechanical characteristics, and its performance is obviously superior to electromagnetic slip speed regulation. In terms of technical indicators, the accuracy of variable frequency speed regulation is ± 0.2%, while the electromagnetic slip speed regulation is only ± 2.5%. At the same time, variable frequency speed regulation can change the synchronous speed of the motor. Therefore, it is an energy-saving product with high conversion efficiency. Many protective properties (overcurrent protection, overload protection, post protection, undervoltage protection, stall protection, etc.) greatly improve the service life of the frequency converter and motor, which is the development direction of the printing machine speed regulation power system

2. Configuration of tension control system: this system is one of the cores of pharmaceutical aluminum foil printing equipment. Generally, the magnetic powder brake is used for unwinding, and the magnetic powder clutch is used for rewinding. The tension detection is realized by the tension sensor installed on the guide roller

3. Configuration of automatic deviation correction system: photoelectric scanning head is used to track and correct deviation in aluminum foil production, and the scanning head can be automatically adjusted according to different positions. Usually, pneumatic scanning head is used to track and correct the deviation of transparent materials

IV. configuration of compressed air volume and cooling water volume:

1. Configuration of air compressor and compressed air volume:

compressed air is used as the working medium in the process of aluminum foil printing and coating. Generally, the reciprocating plug air compressor is selected. The capacity of the air compressor should ensure that the total capacity of the remaining air compressors is not less than the design consumption during the maintenance of the largest air compressor. Its design formula is: q = Φ K(1+ φ)Σ Q cubic meter/minute. Where: q is the design consumption of compressed air; Φ Is the altitude correction factor; K is the ratio of maximum gas consumption to average gas consumption; φ Is the leakage coefficient of pipeline equipment; Σ Q is the sum of the theoretical average air consumption of equipment in the same compressed air supply system, in cubic meters/equipped with cold light in the main working area

2. Configuration of refrigeration equipment and cooling water consumption:

the refrigeration equipment supplies cooling water to quickly cool the aluminum foil that is dried at high temperature through the drying channel on the reel of thin-walled materials in Figure 5. In addition, it has strict requirements on the temperature and humidity of aluminum foil printing, and it is also used to configure cold air and adjust the indoor temperature and humidity. If the added value is high, it can only indicate that the technical content is high. The refrigeration methods of the selected equipment include ammonia compression refrigeration, steam jet refrigeration and lithium bromide absorption refrigeration. The three refrigeration methods have their own advantages and disadvantages, and the configuration can be reasonably selected according to different conditions. The refrigeration load can be calculated by formula according to the requirements of cooling water consumption, temperature rise and make-up water temperature provided by the equipment: q = AC( Σ G1 Δ 1t+ Σ G2 Δ t2)。 Where: q is the design load of cold water. A is the cold loss coefficient; C is the specific heat of water 1000 kcal/T ℃; Σ G2 refers to the total circulating water volume of low-temperature cooling water used by similar equipment at the same time (T/h)

Σ G is the total make-up water volume, that is, the sum of the non recoverable low-temperature water consumption and the make-up of circulating water (T/h), Δ T1 is the temperature rise (℃) during the circulation of low-temperature cooling water; Δ If each vehicle is now calculated with 300kg modified material, T2 is the temperature difference between make-up water and low-temperature cooling water (℃)

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