The other is a single-face corrugated paper machine, which first produces single-face corrugated cardboard, and then is processed by a single-machine glue truck to manufacture different structures and corrugated cardboard.
The single-sided corrugator is a semi-automatic production line that is a combination of a roll tray, a single-sided corrugator and a rotary tray-type paper cutter. It is characterized by high efficiency, good product quality and strong adaptability.
Another kind is to use the automatic continuous production line for corrugated board. A variety of equipment organically combines the entire corrugated cardboard production process to make it continuous. The traditional method of combining production with more than one single machine not only has high production efficiency and low labor intensity, but also has centralized control, simplicity, safety and low noise; the main thing is that the corrugated cardboard produced is of high quality. The flute shape and wave shape are standardized and reasonable. The corrugated medium produced by this equipment is neat, beautiful and has good flatness. Appearance and physical properties are better than the single machine or a combination of single machine linkage line produced products.
Now briefly introduce the three processing equipment specific construction process and technology, respectively.
One, more than one single combined system
1, cutting equipment
Single machine multi-poof decentralized operations, in order to make the web or flat paper suitable for post-processing size specifications, it is necessary to cut. In order to save raw materials, maximize the utilization of paper, but also to plan the material, the implementation of the standard provisions of the splicing.
The web of paper cutting for the single rotary cutter (Figure VI). The equipment consists of a paper frame and lead paper, paper feeding, longitudinal cutting, cross-cutting, splicing and other components. In the cutting can also cut the edge and counting. Cutting specifications can be adjusted according to processing requirements.
The flatbed paper cutting for the paper cutter (Figure 7). The equipment consists of cutting system, pressure system, specification of high-speed system and other components. Currently advanced paper cutter has taken the numerical control device, hydraulic manipulation, light-guided components to ensure the precision of cutting, improve efficiency, safe and reliable operation. Processing specifications rely on the front and back movement of the special push cardboard to limit.
2. Corrugator
The corrugator is a machine that cuts or splices corrugated cardboard and presses it into corrugated paper (Figure 8). The machine consists of upper and lower corrugated rolls, heating devices, adjustment systems, and anti-roll guide claws. In order for the corrugated to be well formed and fixed, the surface of the corrugated rolls must be kept at a temperature of about 200°C. Currently, most of the heating devices used are stoneware. At present, the heating device is mostly a quartz tube equipped with an electric heating wire or an electric heating wire wrapped around a long, square or garden-type heat-resistant body. There is also the use of silicon-carbon rods for heating. If the machine is heated by an electric wire, the power consumption is 10KW/H, while if it is heated by a silicon carbon rod, the power consumption is 20KW/H. The latter machine heats up faster than the former one, and the surface heat lasts for a long time, and the service life is long, but it consumes a lot of power. The corrugator uses flute rolls of types A, C, and B. Type E corrugator is specialized in making corrugated boxes with small volume, and the diameter of corrugator rolls is about 150mm. In order to save energy, equipment manufacturers in the surface of the corrugator, set up a thermal insulation layer, covering the corrugated rolls, both to maintain the thermal efficiency, but also to ensure safety. Some blending manufacturers also adopt high technology and install temperature control devices, thus achieving the goal of ensuring the plasticity of the corrugated corrugated and saving energy at the same time.
3, glue machine
Glue falling out of the machine mainly consists of a pair of coating rollers and two scraping rollers, as well as storage tanks, pressure adjustment system and other parts (Figure IX). Its function is to apply a layer of glue film to both sides of the corrugated paper of the waveform evenly and in the right amount. Then the operator will be coated with glue wave-shaped corrugated paper aligned placed in the middle of the inner and outer paper, made of corrugated cardboard. After a short period of time (1-4 hours), the corrugated cardboard is pressed together and dried naturally, and can be put into the next process for processing as soon as it is shown. The gluing machine with higher precision equipment has chrome-plated surface of the glue roller and scraper roller, which is resistant to acid and alkali corrosion and abrasion. Storage tank can automatically lift, easy to replace the use of different adhesives after cleaning.
Many of the small enterprises that produce the main paper packaging containers, most of the process of production of corrugated cardboard using this reconciliation structure. In order to save manpower and material resources and improve production efficiency, some enterprises arrange the glue machine of the corrugated machine into an "L" shape, and unite them in the middle with a belt reversal, or make the belt of the corrugated paper rows be cut by the action of the light conduit, so that the electromagnetic clutch suction instantly, so that the corrugated paper will fall on the top of the belt going to the glue machine, and the continuous operation, which has a better effect.
Two, single-sided machine and corrugated board production line
Single-sided machine is to make the corrugated paper pressed into the wave-shaped corrugated paper and coated with adhesive on its top, so that it is directly bonded to the face paper, and through the heating of the instant pasting, to create a single-sided corrugated board to meet the quality requirements of the mechanical device. Its production process (Figure 4) has been marked. The equipment mainly consists of raw paper frame, corrugating roll, pressure roll, pre-heating roll, gluing system, glue storage and circulation system, heating system, pneumatic components, and slitting part. The following is a brief description of the function of each part:
1, the original paper frame
Single-sided machine used in the original paper frame is relatively simple, mainly machine lifting, manually adjust the tension of the web, with a certain load-bearing capacity, also known as axial bracket (Figure 10).
2. Corrugator Rolls
The combination of upper and lower corrugator rolls presses the corrugated base paper into corrugated sheets. The pressure (gap), parallelism, and proper center height of the corrugated rolls are important technical indicators of the corrugated rolls' performance.
3. Pressure roller
The top paper and glue-coated corrugated board are subjected to a softening pressure (0.4-0.5MPa) to make them fit together firmly and form single-sided corrugated board.
4. Pre-heating Roll
To ensure that the corrugated flute has a good shape and the single-sided corrugated paper is well bonded, the pre-heating roll is used to dry the raw paper roll to keep a certain amount of water.
5. Gluing System
The main function of the system is to apply a uniform film of glue on the peak surface of the pressed corrugated board. The system consists of glue roller, glue groove, scraping roller and glue circulation device. A good or bad gluing system directly affects the adhesive strength of the corrugated board. To ensure the uniformity of the gluing film applied during the operation of the equipment, the gap between the glue scraping rollers and the gluing rollers is required to be 0.3-0.45mm.
6. Heating System
The system mainly heats up the corrugated rollers, the pressure rollers, the pre-heating rollers, and other parts of the corrugated board. The current heating methods include steam heating, liquefied gas heating, oil heating and electric heating. Regardless of the heating method, the surface temperature is required to be maintained at about 170℃. The use of steam heating tears, taking into account the condensate in the container of the storage accumulation and lead to a reduction in thermal efficiency and surface temperature is not uniform, must be set up a good siphon device. The siphon device's guiding mouth from the inner wall of the corrugated roll gap shall not be greater than 0.8mm, and at the same time shall not be less than 0.3mm, in order to facilitate the timely discharge of condensate.
7. Pneumatic devices
Some single-sided machines use manual devices in the adjustment of corrugating rolls and pressure rolls, which are prone to unnecessary wear and tear due to improper adjustment of the equipment in the right of use or fail to ensure the quality of single-sided corrugated board. Pneumatic devices are used to adjust the gap between the corrugator rolls and pressure rolls on single-sided machines in automatic lines. In order to ensure that the pneumatic device system always works in a good state, it is necessary to ensure that the air compressor works normally, that the working pressure of each pneumatic component is 0.4MPa, and that the quality of each sealing material in the pneumatic component is reliable.
8. Paper Guide and Vacuum Adsorption Device
The core components of a single-sided machine are the upper and lower corrugated rolls. As we mentioned earlier, the parallelism of the upper and lower corrugated rolls and the pressure rolls and the reasonable gap between them are very important. In addition, when the corrugated paper passes through the rolls, the centrifugal effect of the high-speed operation of the rolls will cause the corrugated paper to break away from the rolls. In order to keep the corrugated cardboard from being thrown away and to maintain a good fit with the rolls, a vacuum adsorption device for paperboard guides is required.
At present, most of the corrugated cardboard manufacturing equipment allows the corrugated cardboard to enter the corrugated rolls and form a corrugated corrugated flute right of use by the guide plate. The installation position of the paperboard guide must be correct, and it plays a very important role in the quality of corrugated cardboard. The guide board is mounted on a beam as a component, and the distance between the guide board and the guide board must be consistent with the guide groove on the upper corrugated roll and the gluing roll. The gap between the guide plate and the lower corrugated roll: 0.5mm for A-type flute, 0.45mm for C-type flute, and 0.4mm for B-type flute. Improper adjustment of the gap will make the corrugated paper which has become a wave form to be squeezed by the kneading, which will affect the quality of the corrugated cardboard seriously, so it should be carefully adjusted.
A few days ago, the more advanced corrugated cardboard production line makes the corrugated paper reasonably affixed to the lower corrugated rolls of the device using the principle of vacuum adsorption will be completely adsorbed on the lower corrugated rolls of the corrugated paper, so that the peaks of the corrugated flute flute to get an even amount of glue, to ensure the quality of the corrugated cardboard (such as Figure XI).
9. Slitting Device
The glued single-sided corrugated board is slit according to certain specifications in accordance with the requirements of the processing technology. It is mainly composed of longitudinal cutting garden knife longitudinal cutting and upper and lower long knife composed of cross-cutting to complete, in fact, is also a separate rotary paper cutter.
The raw paper holder in an automatic corrugated cardboard production line is mainly composed of two types: rotary and hydraulic (Figures XII and XIII). The latter is more advanced and does not need to set up a ground pool on the ground. The paper clamping part is controlled by electric power, which converts the placing movement into a linear direction movement, and the power comes from a gear motor fixed on the paper clamping arm. According to the setting of the line force, at the end of the motor's output shaft, a torque limiting device is added. Its raw paper lifting part, by two groups of hydraulic system to promote the work, safe and reliable. Rotary shaftless support by electric control, part of the control of the clamping arm positive or reverse, part of the control of the original paper on the left and right clamping, unclamping, manual brake device to control the tension of the web. The use of rotary shaftless bracket ground to dig enough for its clamping arm to have room to rotate the ground pool to meet the needs of its work.
Original paper holder of any kind, its role is not only to load and release the web, but to play the role of braking. Because proper braking control will maintain the proper tension of the web during operation, thus ensuring that the corrugated board face paper and core paper produced will not be wrinkled, and that the corrugated will be flat and free from collapsing, broken and crooked flutes.
The main functions of the corrugator frame in an automatic corrugated board production line are loading, releasing, moderate clamping of the testliner board, deflection correction, braking and turning.
In the corrugated board automatic production line, the preheater is very important. When the combination of the top paper, corrugated medium and single-sided corrugated board enters the gluing unit, the preheaters are carried out separately, so as to ensure good adhesion and to maintain proper and even moisture. Preheater in order to ensure a good working condition, to maintain the web of raw paper and single-sided corrugated board amplitude tension to achieve good results, can be arbitrarily adjusted and rotated, the preheating angle of the paper web is not less than 90 ° C (Figure XIV).
In order to ensure the preheating of single-sided corrugated board with different layer structures, there are also triple and quintuple preheaters.
In order to make the single-sided corrugated cardboard uniformly and orderly transfer, it is necessary to set up a bridge over the paper. Let the single-sided corrugated cardboard in the combination of each in accordance with the provisions of the track under the control of the operation. The bridge is mainly composed of a guiding part, a transmission part, a tension adjustment and a control device, etc. It makes the single-sided corrugated cardboard run under control before combining. It allows the single-sided corrugated boards to be stacked in an orderly manner, which can make the water of the single-sided corrugated boards evaporate appropriately, curing and enhancing the bonding strength of the adhesive. At the same time, when the single-face machine stops for any reason, the proper stacking will not affect the production operation of the subsequent processes.
The gluing machine is a device that enables single-sided corrugated board or multiple single-sided corrugated boards plus face paper to be combined into three or more layers of corrugated board by applying adhesive. According to the processing structure of corrugated board, the gluing machine is divided into single-layer (three-layer corrugated board), double-layer (five-layer corrugated board), three-layer (seven-layer corrugated board) and other gluing organizations. The gluing device mainly consists of heat roller, gluing roller, floating roller, pressure roller, paper guide roller, heat insulation board, pneumatic components, adhesive tank and other components (Figure 15).
In order to keep the gluing machine synchronized in operation, its transmission is driven by a double-sided machine, and when the gluing machine rotates with no load, there is an independent motor running through the reducer.
The function of the gluer is to apply glue evenly to the flute peaks of single-sided corrugated board. There are specially processed mesh prismatic pits on the gluing rolls, which can save the amount of glue and equalize the gluing during the work. In order to ensure better bonding quality, the floating pressure roller regulated by the pneumatic element should ensure the working air pressure is not less than 0.5MPa. The gluing and scraping rolls are required to maintain good parallelism, and the working gap between the two is 0.25-0.4mm.
When the corrugated cardboard of three, five, seven or more layers are glued together, the glue will be applied evenly to the peaks. When three, five, seven or more layers of corrugated board are combined, it enters the drying, shaping and cooling system. This system is the double-sided machine section. The double-sided machine consists of a hot section and a cold section. The main function is to fully evaporate the water in the corrugated board, so that the adhesive can be cured and the corrugated board can be shaped. The heating section consists of several sets of hot ovens side by side, and the table machine is smooth and even. The corrugated cardboard is directly affixed to it, and on the upper surface of the corrugated cardboard, a special canvas belt with good permeability, a certain tension and gravity, and a transmission pressure roller are added, so that the corrugated cardboard is heated and dried under a certain pressure during operation. The heating section is divided into a high-temperature zone and a low-temperature zone. The high-temperature zone makes the adhesive paste and dry, and enhances the bonding force. The low-temperature zone dries and stabilizes the corrugated board. The function of the cooling section is to dissipate excess heat, even out the water, avoid warping, and enable the corrugated board to enter the next process smoothly.
In order to ensure the normal operation of the double-sided machine, so that the canvas belt in the operation of the tension is appropriate, not biased and not oblique, we must adjust the pneumatic or manual tension mechanism or control device. Normally, we should keep the canvas belt clean and dry for good air permeability. The use of pressurized rolls should be adjusted at the right time according to the forming condition of the corrugated board and the speed of the automatic production line, as well as the quality of the various kinds of web used to ensure the quality of the corrugated board.
The slitting section mainly consists of the cross cutter of the slitting and creasing machine. The role of the slitting and creasing section is to cut the corrugated board into specifications of a certain width according to production needs and to complete the longitudinal bending of the corrugated board at one time during longitudinal cutting. The slitting machine is generally a two-component slitting and creasing machine. Two sets of specifications can be adjusted at the same time according to production needs. When replacing the production specifications, it is only necessary to start the electrical control device and make the equipment rotate 180° to put it into use, which reduces downtime, lowers consumption and improves production efficiency. In order to ensure that the longitudinal cutting garden knife in the slitting does not make the corrugated cardboard cutting knife mouth, face paper cracking in line with national standards, each group of garden knife adjusted fit gap should be less than 0.04mm.
Longitudinal cutting and creasing machine itself has a slitting garden knife and creasing wheel up and down the gap adjustment mechanism, according to the different thickness of the corrugated cardboard to be adjusted in due course. This ensures the quality of slitting and creasing.
Longitudinal creasing machine creasing wheel, after many packaging technology workers research and discussion, is now more popular to use the Xi'an Qinchuan machinery carton factory comrade Song Shibin developed a point type creasing wheel (Figure 16).
The five-point indentation wheel is characterized by: a prominent center line, accurate indentation dimensions without flute, groove width of 6.4mm, so that the corrugated cardboard has a sufficient amount of deformation; two shoulders for the beveled surface, so that the corrugated cardboard in the rolling of corrugated cardboard to get a better destruction of the corrugated, and stress is not centralized; so that natural deformation of the corrugated cardboard and the formation of trace marks and does not break.
The cross cutter is mainly used to cut corrugated boards horizontally according to certain specifications. It consists of the upper and lower two rolls equipped with long knives that can be rotated to form a set of instantaneous shearing devices when flipped to a certain angle. The rotation of the double rollers equipped with long knives is equipped with adjustable backlash-free gear anastomosis transmission, which ensures the precision of shearing. When the gears are worn, the gear gap can be readjusted. The use of the cross-cutting machine should ensure the use and adjustment of the stepless transmission, because the change of the speed ratio is related to the length of the corrugated cardboard cut coal. During operation, its tension should be controlled according to the quality of the corrugated cardboard, in order to prevent the thickness of the corrugated cardboard from being affected by the self-weight of the drive roll itself plus a certain amount of tension.