Corrugated board production line transformation inventory
The development and demand of the carton industry has led to an increasing demand for carton machinery and equipment. In order to adapt to the market competition and the severe cost pressures, whether the production equipment of carton manufacturers can meet this market condition is almost a “lifeline†for each company’s profitability and survival. However, it is impossible and unrealistic to completely renovate old production equipment. The only choice is to carry out technological transformation of the production line. In order to allow the carton factory to learn from the equipment transformation, the following lists some of the technical features of how to modify the various parts of the corrugated board production line for reference.
Vacuum-adsorption modification of guide jaw type single-faced machine
In order to ensure that the corrugated paper after ironing can be tightly adhered to the corrugated roll squeezing type, the sizing of the corrugated paper dome part and the compounding with the noodle paper are accurately performed, so that the corrugated paper is not displaced on the lower corrugating roll so as not to cause the corrugated deformation.
The corrugated paper positioning method on the lower corrugating roller has been developed from the mechanical guide jaw type to the commonly used vacuum suction type, cover type vacuum absorption type, and positive air cushion type. The cover vacuum suction (also known as the external suction type) is widely used due to its simple structure, easy maintenance, and low manufacturing cost.
Guide jaw type single-faced machine uses a copper guide plate (also known as copper knife, guide plate), the upper part of the guide plate is inserted into the groove of the upper corrugating roller, and the center of the upper and lower corrugating rollers is connected. The back is embedded in the groove of the rubber coating roller. The arc surface of the abdomen is concentric with the lower corrugated roller and keeps a suitable gap larger than the paper thickness. The lower part of the lower spreading * is connected with the center of the corrugating roller and the pressure roller. The formed corrugated paper is separated from the upper corrugating roller by a guide jaw plate, and the corrugated paper is placed in the jaw type of the lower corrugating roller to complete the coating and compounding process. Because there must be a running gap between the guide plate and the paper, when the lower corrugating roller runs quickly, the centrifugal force and gravity will always make the corrugated paper ejected from the lower corrugating roller, and the continuous friction with the guide plate will make the guide plate wear. The faster the speed is, the greater the play is. When the guide jaw plate wears to a certain degree, the corrugated paper cannot be accurately positioned on the lower corrugating roller for gluing and compounding processes, which directly affects the product quality. At the same time, the installation and adjustment of the guide jaw plate is demanding and difficult, and the axial stretching of the upper corrugated roller will also cause the guide jaw plate to wear out with its groove wall. Therefore, the wear of the guide jaw plate is large, and the production operation is not Stable, frequent replacement adjustments. The glue roller also causes hardened glue on both sides of the pawl plate to affect the quality of the paperboard, all of which limits the running speed of the guide jaw type single-side machine and affects the product quality.
Outer cover vacuum adsorption consists of suction hood, paper guide copper, suction pipe, damper, high pressure suction fan and muffler. The suction vacuum groove is uniformly distributed on the roller surface of the lower corrugated roller. The high-pressure blower blows the air through the suction pipe and causes a negative pressure between the inner cavity of the suction hood and the lower corrugating roller to pass through the lower corrugating roller. The suction groove makes the formed corrugated paper tightly adhered to the lower corrugating roller, accurately completes the gluing and compounding process, and then is a paper guide copper sheet installed on the suction hood and extending into the suction groove of the lower corrugating roller. The composite dry two-layer corrugated board is guided out from the lower corrugating roller, during which the damper can be adjusted to control the suction volume, and the muffler can reduce the noise of the suction airflow. Replacing different types of corrugating rollers can produce various types of two-layer corrugated cardboard.
Outer cover type vacuum absorption adopts the principle of vacuum negative pressure to position the formed corrugated paper, eliminating the positioning instability caused by the mechanical wear of the guide jaw type structure, which is sufficient for high speed operation. Outer cover vacuum adsorption modification includes:
Newly made external suction corrugating roller. The outer suction hood is mounted on the lower corrugating roller, and a suction slot distributed at a certain distance is processed on the roller surface of the lower corrugating roller. The upper corrugating roller has no groove, and the original corrugating roller is eliminated;
The new rubberizing roller, the original guide roller plate on the rubber roller will affect the composite quality, the new rubber roller without groove;
According to the specification of single-side machine and corrugated roller design and manufacture suction hood device, paper guide copper plate device and installation fixture;
According to the actual structure position of the single-side machine and the surrounding environment, design the direction of the suction duct, determine the position of the high-pressure fan, and manufacture the suction duct system and high-pressure fan bracket;
According to the specifications of the corrugating roller, the matching high-pressure blower and muffler are selected to design the electrical control.
Cone-shaped paper holders are converted into self-expanding paper holders
Corrugated paperboard production line base paper cone-type paper holder, there are problems in the use of the base paper and paper inside the paper break the disadvantages, resulting in difficult tail paper use, tail paper scrap rate of more than two thousandths of more than. The self-expanding paper clips do not need power assistance. After the paper is successfully cut, the ribs of the clips tighten or loosen with the paper frame to automatically inflate in the paper paper tube, expand and fix the original paper, or automatically shrink and remove the base paper completely. The utility model solves the disadvantages of cone-shaped paper chucks to break the tail paper and improves the utilization rate of the original paper.
Adding an automatic splicer
With manual splicing, it is easy to break the paper, and regular parking phenomenon occurs, resulting in a lot of loss. Selecting the automatic splicer ensures that the single-sided machine and the double-sided machine run at full speed when the paper is changed, which helps to reduce the loss of the base paper, improve the production efficiency and product quality, and eliminate the overlap and unbonding that manual splicing could not avoid in the past. The "long tail" phenomenon created by the old and new paper rolls also makes the operating environment of the operators safer.
Intermittent traps transformed into straight-through efficient traps
The traps used in the traditional form of production line hydrophobic system are mostly batch type, which is not conducive to the heat demand under continuous production conditions, and the conversion into a straight-through high-efficiency steam trap not only meets the heat demand introduced into the continuous production of the cardboard production line, but also reduces the demand. Energy consumption, long service life, and at the same time due to back pressure, can increase the temperature of the heating part.
Steam recovery machine
The steam recovery machine directly compresses the condensed water from the steamed area and the steam carried by it into the boiler through a double-compression cylinder, so that the boiler, the steaming area and the steam recovery machine form a closed circulation loop, thereby achieving the purpose of energy saving. At the same time, as the number of times that the boiler replenish cold water due to evaporation decreases, the time for which the boiler maintains pressure within a set pressure range increases, ie, the number of times of reheating to increase the temperature is reduced, and the supply of heat to the heating portion of the production line is also constant. It is also beneficial to improve the quality of corrugated board and increase the speed.
Transformed into automatic glue making machine
In the process of artificial glue, the adhesive is not easy to be stable, and the error of the adhesive viscosity of the artificial glue sometimes reaches 10 seconds to 20 seconds, and the gelatinization temperature also fluctuates. This will cause the quality of the paperboard. Good and bad.
The main function of the automatic glue making machine is to stabilize the adhesive, and the adhesive is stabilized at a fixed viscosity by a special device, and the error of maintaining the viscosity is within ±2 seconds. It adopts computer automatic control, all raw materials are automatically added, artificial factors are excluded, and different formulation adhesives can be provided according to the actual conditions of the production line.
The traditional form of gravity roller is transformed into a pressure bar
The traditional gravity roller can easily cause unstable sizing, excessive or insufficient phenomenon, and affects the adhesion and physical strength of corrugated cardboard.
The pressure bar is installed on the compound machine to replace the gravure pressure roller. It is made of many wear-resistant curved plates and springs. It does not need to be adjusted. It is driven by springs, and the corrugated medium is always even in the elastic state. Adhesion on the glue roller, ensure that the corrugated paper is evenly glued and the corrugation is not damaged.
Traditional roller press shaft transformed into hot plate
Roller shaft contact area is only a line, the heat transfer efficiency is low, easy to cause partial wear of the drying plate, resulting in poor adhesion. And the roller shaft is installed in a decentralized manner. The weight is too heavy and it is difficult to adjust. It is easy to damage the corrugated cardboard.
The hot plate is made of special wear-resistant plate and spring. The hot plate and the corrugated cardboard have large contact area, which accelerates the energy exchange and ensures the heat required for the cardboard molding. In production, each group of hot platen can automatically choose to lift according to different speeds and different temperatures, and the hot platen is driven by the spring force to achieve a high degree of automatic control to ensure the thickness of the corrugated board.
Transformed into a conveyor belt automatic correction system
The use of manual correction of the conveyor belt, with the extension of the use of time, due to the use of tension on both sides of the tension will produce uneven phenomenon, the conveyor belt after stretching will run away, with the two sides of the metal stent friction, Causes the wear of the cotton webbing edge and affects the service life of the conveyor belt.
Conveyor automatic correction system can make the conveyor belt automatically run in the controllable area, no longer occurs in conveyor belt tensile deformation and friction with the metal bracket, thereby prolonging the service life.
Computer and vertical cutting machine
Traditional slitting machine can no longer adapt to the needs of many types of orders and multiple orders. It requires a long manual change time and low efficiency. Moreover, the mechanical slitting presses are generally equipped with double-blade cutting. Both sides of the corrugated cardboard after edging were squashed and deformed. If this kind of traditional longitudinal slitting machine is replaced with computer thin knife longitudinal slitting press, it can realize computer change of single, automatic row of knife, high quality thin blade can automatically sharpen the knife, the edge of the paper is cut clean, and the corrugated is not deformed. Due to the different mechanical structures, improvements to the slitter generally require replacement of the entire machine.
The cross cutting machine has experienced manual, cut single-sided paper type, mechanical control type, computer controlled straight knife type, computer controlled spiral knife type. The mechanical control of the cross cutting machine in the production process for the single loss is too large, the paper cutting error is large, at present many companies have been eliminated on the scale. The computer-controlled straight knife cutting machine is the computerized control cutting machine with the most mature technology and the lowest use and maintenance cost at present. The thickness of the straight knife used is large, plus the improvement of the level of straight knife manufacturing. There will be no problems during the year and the prices will be lower. The computer controlled spiral knife cutting machine is the latest technology. The cross cutting machine design supported by this technology uses a low moment of inertia tool shaft design, the tool shaft is small, the control difficulty coefficient is relatively low, the power is small, and the high power can be achieved. Production speed requirements.
At present, the cross-cutting computer control is divided into DC computer control, DC servo control, AC servo control, and calibration cut-off control. Ordinary DC control systems have more manufacturing companies, longer production times, and lower market prices. The DC servo control system is a technology developed on the basis of the DC control system. After the paper cutting machine is used in the production process of the cross cutting machine, the brake is required and the red charging module is charged. After the power is released, it is released before the paper cutting. Certain power-saving features. AC servo control system is the latest technology, it can be applied to the production of higher speed, higher cutting accuracy requirements. Calibration cut-off technology appears with the application of pre-printing technology in the production of corrugated board. The current computer control system can be installed with this system. The better configuration is the addition of a calibration and cutting system for AC servo control systems. High cutting accuracy.
Add production management system
The production management system of tile line is a computer control system used to assist the automatic production of tile lines. It uses precise sensors and computer's fast calculations to conduct a series of detection and control of tile lines at appropriate timings. Simulate manual operations. These controls include vehicle speed adjustment, clearance adjustment, paste adjustment, and base paper materials, which can save manpower, reduce downtime adjustment time, accurately measure tile line production efficiency, increase tile line production capacity, and realize the entire production line. Speed ​​synchronization, reduce losses, reduce the production of waste.
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