You can go to the China Printing Network and the China Packaging Network to inquire about the information you want.
Chapter 1: The Composition of Corrugated Board
Corrugated board began in the late 18th century, and its use grew significantly in the early 19th century because it was lightweight and inexpensive, versatile, easy to make, and recyclable and even reusable. By the beginning of the 20th century, it had gained a comprehensive popularization, promotion and application for the production of packaging for a wide variety of commodities. Because packaging containers made of corrugated board have their own unique properties and advantages for beautifying and protecting the goods inside, they have been extremely successful in competing with a wide range of packaging materials. It has become one of the main materials used in the production of packaging containers, which has been used for a long time and has shown rapid development so far.
Corrugated board is made by bonding face paper, liner, core paper, and corrugated paper processed into corrugated flutes. According to the needs of commodity packaging, corrugated cardboard can be processed into single-face corrugated cardboard, three-layer corrugated cardboard, five-layer, seven-layer, eleven-layer and other corrugated cardboard (such as Fig. 1, Fig. 2, Fig. 3). Single-faced corrugated cardboard is generally used as a protective liner for commodity packaging or to make lightweight kags and pads to protect commodities from shocks or impacts during storage and transportation, while three-layer and five-layer corrugated cardboard are commonly used in the production of corrugated cartons. Many commodities are packaged in three-layer or five-layer corrugated cardboard, which is exactly the opposite of when they are beautifully packaged, with colorful graphics and images printed on the surface of the corrugated carton or box, which not only protects the inner commodities, but also advertises and embellishes the inner commodities. At present, many three-layer or five-layer corrugated cardboard corrugated boxes or corrugated cartons have gone straight to the sales counter in a dignified manner and have become sales packaging. Seven- or eleven-layer corrugated cardboard is mainly used to make packaging boxes for electromechanical products, baked cigarettes, furniture, motorcycles, and large home appliances. In specific commodities, this corrugated cardboard can be combined to make inner and outer boxes, which are easy to make and convenient for commodities to be loaded, warehoused and transported. In recent years, according to the needs of environmental protection and the requirements of relevant national policies, this kind of corrugated cardboard made of commodity packaging, there is a trend to gradually replace the wooden box packaging.
Section I: Corrugated Cardboard Fluting and Waveform Shapes
I: Corrugated Cardboard Fluting
Different corrugated shapes of corrugated cardboard are bonded together to form corrugated cardboard with different functions. Even if the same quality of face paper and liner are used, the performance of the corrugated board will be different due to the difference in flute shape. Currently, there are four types of corrugated flute shapes in common use internationally, namely, A-type flute, C-type flute, B-type flute and E-type flute. Their technical indicators and requirements are shown in Table I. A-type flute made of corrugated cardboard has a better cushioning, a certain degree of elasticity, C-type flute than A-type flute, followed by stiffness and impact resistance, but the stiffness and impact resistance of the corrugated cardboard. But the stiffness and impact resistance is better than A-type flute; B-type flute arrangement density, made of corrugated cardboard surface flat, high pressure, suitable for printing; E-type flute due to the thin and dense, more present its rigid strength.
Table 1
Flute height, mm Number of flutes, pcs/300mm
A 4.5-5 34±2
C 3.5-4 38±2
B 2.5-3 50±2
E 1.1-2 96±4
The waveform of corrugated board
The waveform of corrugated board is the following The shape of corrugated board is divided into V-shaped, U-shaped and UV-shaped.
The V-shaped corrugated corrugated waveform is characterized by a high level of plane pressure resistance, which saves on the amount of adhesive used and saves on corrugated paper. However, the cushioning of corrugated board made from this type of corrugated waveform is poor, and the corrugated board is not easy to recover from pressure or impact.
The U-shaped corrugated waveform is characterized by a large gluing area, strong bonding and a certain degree of elasticity. When impacted by external forces, not as fragile as V-shaped flute, but the plane expansion pressure strength is not as strong as V-shaped flute.
Based on the performance characteristics of V-shaped flute and U-shaped flute, UV-shaped corrugated rolls have been commonly used to synthesize the advantages of the two. The wave-shaped corrugated board processed not only maintains the high pressure resistance of V-shaped flute, but also possesses the high adhesive strength and elasticity of U-shaped flute. At present, the corrugated rolls of domestic and foreign corrugated cardboard production lines use these UV-shaped corrugated rolls.
Section II: Manufacture of Corrugated Cardboard
Currently, there are three types of equipment for manufacturing corrugated cardboard and corrugated boxes in China. One is the traditional single machine. That is, a corrugated paper to form a wave-shaped corrugated paper machine of a face paper, liner, core paper and the formation of wave-shaped corrugated paper gluing machine, to complete the manufacturing process of corrugated cardboard. And the single machine supporting the manufacture of corrugated boxes and corrugated cardboard equipment to complete the batching, cutting, printing, splicing, slitting, slotting and corner cutting and molding processes. The entire stand-alone assembly line has more equipment, more process links, poor product quality control, and high consumption.
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 production process and equipment structure of the single-sided corrugator is illustrated (Figure IV).
Figure 4 Schematic diagram of the structure of the single-sided corrugator
The single-sided corrugator is a semiautomatic production line that combines a reel pallet, a single-sided corrugator, and a rotary pallet-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 productivity and low labor intensity, but also has centralized control, simplicity, safety and low noise; the main thing is that the corrugated board 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 products produced by single machine or combined single machine linkage line.
Five-layer corrugated board production line production process and equipment structure schematic (Figure V).
The three types of processing equipment are now briefly introduced to the specific construction process and technology.
One, more than one single machine combination system
1, cutting equipment
Single machine multi-poof decentralized operation, in order to make the web or flat paper suitable for post-processing the size of the specifications, it is necessary to carry out cutting. In order to save raw materials, maximize the utilization of paper,
But also plan the material, the implementation of the standard provisions of the splicing.
The web for cutting for the single knife rotary cutter (Figure VI). The equipment consists of the upper 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 paper 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 is faster than the former one in terms of temperature rise, long-lasting heat on the surface, and long service life, but it consumes more 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, so as to ensure the plasticity of the corrugated flute and save energy.
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 regulation 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 gluing and scraping rollers, 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 labeled. 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. Siphon device guide suction mouth from the corrugated roll inner wall clearance shall not be greater than 0.8mm, but also can 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 as a component on a beam, 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 the 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 adjusted and rotated arbitrarily, the preheating angle of the paper web is not less than 90 ℃ (Figure 14).
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. 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-sided 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 the production needs and to complete the creasing of the longitudinal bending requirements of the corrugated board at one time during the longitudinal cutting process. 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 the downtime, lowers the consumption and improves the 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.
The key to the use of the cross-cutting machine is the installation and adjustment of the blades. The installation of the two long blades of the cross-cutting machine is fastened to the big shaft with pressure plates and bolts. Adjustment of the blade is mainly to adjust the two blades in the knife shaft rotation fit clearance. The best fit clearance should be 0.05mm, so that the knife axis in the rotation will not produce blade bite impact, while the rotation of the light and fast, cut out the corrugated cardboard edges smooth and neat, the knife meets the national standard requirements.
Section III: Printing and post-processing of corrugated board
Whether using a single combined machine or a more advanced joint unit, to make corrugated board into different specifications of corrugated cartons, there is no more than printing, crimping, slotting, corner-cutting and splicing. It can also be printing, die-cutting and splicing.
The single combined machine has already glued the printed side directly to the corrugated board through the glue fairy before the corrugated board is formed. Therefore, it only needs to complete the corrugated box forming process through the slitter, crimper, corner cutter and stitcher. Since the 1980s, in the single-machine production process, in order to ensure the overall quality of the corrugated carton, improve production efficiency and reduce consumption; a combined unit that integrates the functions of slitting, crimping, slotting and corner-cutting into one unit has been utilized (Figure XVII). Gradually eliminated the slitting, crimping, corner cutting and other single production equipment.
The single-sided corrugated made by the single-sided machine, but also through and single unit and combined production and then to complete the molding process. However, unlike the single combined machine, the corrugated board produced by the single-sided machine and after the single combined machine is restored to full strength, can be printed by a corrugated paper printing machine or corrugated paperboard printing and slotting machine, corrugated paperboard printing and die-cutting machine and other units to complete the molding process before stapling or joining full strength.
The only equipment for the automatic corrugated cardboard production line to complete the molding process is the large-scale printing and slotting machine or printing and die-cutting machine.
These two types of equipment are briefly introduced:
I. Printing and slotting unit
This equipment consists of feeding, printing (once, twice, or even more), slotting, creasing, corner-cutting, cutting, waste extraction, and stacking. Its equipment structure is schematic (as Figure XVIII).
The structure of the printing slotting machine group is now described item by item.
1, feeding part
This part consists of picker, feeding roller, vacuum adsorption and other parts. The main purpose is to send the corrugated cardboard to the printing system in a flat and accurate way.
2. Printing Part
This part consists of aniline ink circulating system, ink-adjusting rubber rollers, anilox rollers, plate rollers and gap adjusters. Gap adjuster's working status by pneumatic components, electrical components and mechanical action to complete.
Currently, the printing equipment used by corrugated carton manufacturers differs in the nature of the inks used and the structure of the equipment. The corrugated cardboard printing presses that use aniline ink are not only capable of printing corrugated cardboard, but also of printing general cardboard. Its inking system is more complex than that of the aniline press. The printing of patterns and text is close to that of an offset printing press. The equipment for printing with aniline ink is characterized by a very simple structure for transferring the printer's ink due to the use of aniline ink, which has a very low viscosity.
The use of aniline ink printing corrugated board, easy to the surface of the corrugated board ink output, not only the breakage rate is low, printed out the design of the text of the quality is very high. The use of this printing equipment due to the process of high-speed printing, the evaporation of water will cause changes in the concentration of aniline ink, the billion by constantly adjusting the viscosity of the ink to adjust the tone of the printing.
Printing slotting machine group using the printing plate mainly rubber plate and resin plate. Rubber plate is manually engraved, can only be used as a general printing plate. And fine pattern text, you have to use the resin plate to print.
3, pressure line, slotting, corner cutting, cutting part
The part mainly consists of upper and lower rolling wheel, upper and lower slotting knife, upper and lower corner cutting knife and cutting knife and other components. The upper and lower rolling wheels are mainly used to complete the longitudinal pressure line of the corrugated cardboard; the upper and lower grooving knives cut into the lower concave knives through the upper convex knives to complete the opening of the seams of the corrugated cardboard; the upper and lower corner-cutting knives complete the molding of the tongue of the corrugated cardboard box joints through the upper corner-cutting blades and the lower knives and pads; and the parting knives are used for sliding edges according to the specified dimensions.
Between the printing and printing of the multi-color printing unit and between the crimping and slotting, there are installed with a screened surface indeed, the lower wheel as a transfer device, so that the corrugated cardboard is synchronized and accurately passes through each process.
4. Waste extraction and stacking section
The main function of this section is to extract and pulverize the confetti from anti-slotting, corner-cutting, and slitting through the pipeline centrally to maintain the working environment of the site. In the stacking section, the printed corrugated cardboard is picked up by the conveyor belt and then the upward and downward adjustable conveyor table boards stack the corrugated cardboards that have completed the printing and slotting process on the discharge racks to enter the next process.
5. Stapling Combination Part
The combination part mainly consists of two methods: stapling and gluing. In addition to the traditional single nail box machine to complete the combination of corrugated box molding, in recent years, the domestic has developed automatic, semi-automatic nail box machine. According to the box nail arrangement of the beginning of the head of the nail box equipment head construction is divided into single oblique nail, double oblique nail, single straight nail, double straight nail, single horizontal nail and double horizontal nail. At present, the use of double oblique nails is more common, because of its arrangement structure to enhance the bonding strength of corrugated boxes. The nails used for nailing boxes are low carbon steel flat wires with plating. The specifications are divided into 16#, 18# and 20#. 20# nails flat wire is used for the combination of corrugated cardboard.
Many commodities use corrugated cardboard boxes and corrugated cardboard, because directly in the process of commodity spit production for packaging, so must use the paste combination. Some commodity packaging is also due to the requirements of the goods inside, must also be used to paste the combination of domestic in recent years, has developed and produced a semi-automatic or fully automatic sticky box machine (Figure 19). Paste combined with the use of adhesive for polyvinyl acetate emulsion, PVC solution, animal glue and starch adhesive.
Automatic gluing machine is the successful development of China's high-tech products. It mainly consists of paper feeding system, gluing system, folding and molding of the corrective system, counting and output system and other components. It integrates optical, electric and pneumatic as one of the high-precision timing control. High efficiency and automation ensure the combination of high quality of corrugated boxes.
Two, printing and die-cutting machine group
The printing part of the printing and die-cutting machine group and the printing part of the printing and slotting machine group are basically the same in terms of function and technological process, so we won't repeat them here.
In a single combination of equipment used in the die-cutting equipment is mostly flat creasing machine and ministerial type flatbed die cutting machine. The die-cutting machine is used for corrugated cardboard and board; the flatbed die-cutting machine can directly process corrugated cardboard to make corrugated boxes and corrugated cardboard. However, because of the slow speed, low production efficiency, and can not be directly combined with printing equipment to form a continuous production, so, only as a single machine with the use.
In recent years, the development of the garden pressure garden mark cutting line machine, the use of better results. And printing equipment combined with the die-cutting equipment, is the garden pressure garden creasing and cutting machine (Figure 20).
The equipment consists of upper and lower two sets of rollers. At the same time with a gap adjustment device, stepless speed control, electromagnetic counting, photoelectric, pneumatic joint control and other high-tech means, die-cutting, creasing accurate, safe and efficient under the roller for the bottom roller, the upper roller for the version of the rollers, the surface of the rollers are arranged in a certain distance from the perforation and tapping, the main reinforcement to install the made of the die-cutting version. At present, the role of the template are exploring the upper roller diameter specifications by the laminate high temperature, high pressure shaping production. Lower roller has a layer of 20-30mm thick polyurethane or polychlorinated synthetic material, so that the formation of the die is called soft cut; direct role of the steel rollers and die-cutting version of the contact is called hard cut. These two types of die-cutting mode has its own characteristics. Generally speaking, the soft cut is not too smooth, especially after long-term use, the surface of the dressing layer was cut into many times and become wobbly and flat, but the use of long life of the knife. Some domestic manufacturers of die-cutting equipment under the diameter of the roller to change the small, but the pressure-bearing capacity remains unchanged, and then in accordance with the original roller radius production into two halves can be installed at will, high-speed laying of the development of grease specifications of 150mm or so of the aluminum module, once in use, found that laying the surface of the layer is not flat can be replaced at any time to adjust the very convenient.
The templates used in the garden indentation line cutting machine have certain specifications in terms of length and thickness. The length is 800mm, 1200mm and 1400mm; the thickness is 14mm, 16mm and 18mm respectively. die-cutting different structures of corrugated board, to choose different thickness of the template, not only to ensure that the die-cutting knife edge of the neat and tidy, and at the same time to ensure the original thickness of corrugated cardboard.
The cutting knife used in the garden pressure garden indentation line cutting machine is 23.8mm in height, and the thickness is from 0.5mm to 1.5mm in a variety of specifications; the knife blade has teeth, line, single-sided edge and double-sided edge; the beginning of the knife has a straight knife arc knife. In order to facilitate the use, the back of the curved knife is also open to a certain depth of the groove. According to the structure of the corrugated cardboard to be die-cut and the material to be used, knives of different shapes, thicknesses and blades are selected to ensure the quality of the die-cutting.
The crimping line used in the garden crimping machine is made of high-strength nylon, and is shaped like a ┻. The bottom edge is 15-20 inches wide. The width of the bottom edge of the lower part is 15-20mm, and the width of the protruding part and the surface of the strip is 2.5mm, 3.6mm and 4.8mm according to the structure of the corrugated cardboard. The height of the protruding part is 5mm and 6mm, and the length is generally 400mm.
The production of the die-cutting plate used in the garden pressure garden creasing and cutting machine is done with special equipment because of the complexity of the process and the requirement of high precision.
Section 4: Common Quality Problems, Causes and Solutions of Corrugated Board
Table 2
Quality Problems, Causes and Solutions
Bad Adhesion 1. Excessive Force on Facing Paper
2. High Moisture in Facing Paper and Core Paper
3. Low Adhesion of Adhesive
4. Quality of Adhesive
6. Bad
7. Incorrect position of cardboard guide or dirt
8. Non-parallelism between gluing roll and floating roll
9. Improper operation of lifting mechanism of the canvas belt
10. Insufficient heat, starch coagulates prematurely
11. Improper placement of weight roll of the duplex machine
12. p>12. Binder forming lumps, uneven gluing ? Adjust the brake to reduce the friction
Increase the preheat or adjust the paper Adjust the reasonable gap between the two Increase the adhesive adhesion amount Correct the quality of adhesive Correct the position of the guide plate and clean the dirt Adjust the reasonable gap between the two Check the no-pressure device and the mechanical adjusting system Check and remove the factors of heat insufficiency Reduce the preheat properly. p> Reduce the preheat appropriately Adjust and reset the weight rolls Solve the quality of adhesiveTable 3
Quality Problems Causes Solutions
Transverse downward warpage 1. Too small amount of adhesive applied by the gluer
2. Insufficient temperature of the hot plate on the duplexing machine
3. Insufficient water content in the single-sided corrugated board on the overlay bridge
4. 4. Excessive heating by triple preheater
5. Small amount of glue applied by single-sided machine
6. Too fast speed
7. Single
7.