Coordination between speed and tension
Under the condition of a certain tension in the printing process, the higher the printing speed, the greater the degree of trademark bending; on the contrary, the higher the printing speed, the greater the tension, the greater the trademark bending. In order to give full play to the efficiency of the equipment in production, the problem of trademark bending can not be solved by reducing the speed of the vehicle, so it is necessary to select the tension parameters reasonably to solve the quality problem. For example, in the operation, the speed is 130m / min, the tension before pulling force is 20dan, and the tension after pulling force is 35dan, which is an ideal parameter. As for the selection of actual parameters, it can be adjusted according to the printing effect.
The influence of drying temperature and air volume
The higher the temperature in the drying oven is, the better the printing process will be. However, if the temperature is too high, the trademark will be bent. Therefore, for the hierarchical printing, the temperature is generally stabilized at 55 ℃ ~ 90 ℃, and the air inlet pressure and air outlet pressure of the drying oven must be balanced. If the exhaust air volume is too large, the film shrinks strongly and the trademark bends seriously.
Drum is the heart of offset press. After three or five years of use, many offset press will have drum beat out of tolerance. Drum beat will cause ink bar and double shadow on the printed matter, and the printing plate's printing resistance will be reduced, thus affecting the quality of the printed matter. Therefore, we should take seriously the machines with large drum runout and solve the problems in time. During the disassembly and inspection of the overhaul machine or finishing machine, it was found that the large drum runout was mainly due to the serious rust corrosion of the eccentric sleeve and the wall panel hole, the elongated wall panel hole, and the abrasion of the wall panel hole along the stress direction into an ellipse, which resulted in the runout out exceeding the tolerance. There are many reasons for wear and tear. The main reason of Zui is the material and use problems of the wall panel. The repair method mostly uses the wall panel boring insert to repair, but the boring insert printing machine needs to be disassembled and assembled once, which requires a long cycle, does not affect production, and costs a lot of money. Therefore, it is necessary to find out the causes and take measures as soon as possible.
Six
4. Zero print limit. Due to the cost of printing plate and the limitation of printing process of traditional printing machine, the start-up fee and the quantity of starting printing are the premise of receiving orders in traditional printing mode. In short, if you only produce one carton, the cost of traditional printing may be several to ten thousand yuan. Digital printing has no starting limit. Even if only one carton is printed, the cost is almost the same as mass production.
5. Fast printing speed. The printing speed of flat industrial digital press has reached 625 m2 / h. In the process of sample preparation, traditional printing needs a tedious process such as plate making, adjusting equipment, ink adjusting, etc., which needs at least one day. The digital printing machine can achieve the goal of standing on the spot. As long as it has the electronic manuscript of pictures and texts, the manuscript of 5 square meters can be printed in 1 minute.
"Kill three birds with one stone" corrugated packaging digital printing business
Digital printing technology has existed for a long time, but the application of industrial printing on corrugated boxes in China is rare. Managers of corrugated packaging enterprises all know the fact that small orders and replenishment orders are important factors affecting the release of equipment capacity, and the way to effectively solve this problem is digital printing. With the gradual combination of digital printing technology and corrugated packaging industry, the development of this printing method in the corrugated packaging industry will surely lead the transformation of the corrugated packaging industry.
One
Creativity in new printing materials
Through the glass printing technology, painters can have better performance.
Painters can display and sell paintings on dining tables, coffee tables, shower doors, glass toll booths, glass plates and other things, and combine them with artistic expression. With the development of UV printing, they have found a new "canvas".
At present, another popular application of Zui is to print a unique architectural sign on the glass that can be used inside the office building and reception area.
Printing process
Painters and interior designers have found that printing glass on the opposite side is a very effective method without the use of tackifiers. Printing on the opposite side, or "second surface printing", allows Zui end products to be protected by the glass itself.
Without coating glass, UV printing can also be successfully carried out on glass.
Printing on glass with low curing light, and then solidifying the printed matter with non printing channel, "double printing" glass printed matter, or glass etching is used to replace the addition of tackifier or liquid coating layer, which are all methods to protect glass.
In the traditional printing process, each page takes up a piece of film when it is output. Although films of different sizes and models are sold on the market, there is still a problem of wasting film. In order to improve the productivity and quality of printing process, Huaguang mosaic folding software provides powerful functions of automatic, manual mosaic and automatic folding. In this way, the user can automatically and manually drag the specified or arbitrary typesetting results into a piece of film for output, thus saving the film.
Once paper has static electricity, it will bring a lot of trouble to printing. First, the paper can't be collimated. Under the action of static electricity, paper and paper are firmly attracted and uneven, and air is difficult to enter the paper. If you want to collide with each other, sometimes you have to pull them apart one by one, which is a waste of time. In the printing process, due to electrostatic attraction, single sheets of paper are firmly pasted together, sometimes two sheets, sometimes several sheets, sometimes a stack of paper can not be separated, resulting in the separation nozzle can not absorb paper. When the pressure of the brush is heavy, it often produces broken and empty pieces; when the pressure of the brush is light, it also produces two or more pieces. When multiple sheets of paper enter between the rubber drum and the embossing drum, the car will be blocked and the blanket and pad will be damaged. The paper with static electricity is not smooth when it is transported forward on the paper feeding table, and it is not straight and positioned correctly when it reaches the front gauge, resulting in the second overprint being unable to register, poor product quality and great waste. Even after the stamping part, the paper receiving is also very uneven, which brings great trouble to the second whole paper and seriously affects the production speed.
Paper with static electricity and papermaking has a certain relationship. In general, the base paper is less electrified when leaving the factory, and the probability of copper plate paper electrified is also small. Because printing paper (white board paper, paper jam, etc.) and copper plate paper are reprocessed on the basis of base paper, even if the base paper has been charged, it will be eliminated in the process of processing. Generally, the paper with a fixed weight of less than 80g / m2 has more static electricity, but it is not obvious that the paper has static electricity before printing or before printing, which is usually a sudden increase of static electricity after pressing. In the process of offset printing, due to the presence of water, there are not many people with static electricity after printing. For offset printing, static electricity is mainly generated before printing.
Four
The working environment is the basic condition to achieve the ideal printing effect. The working environment problems mainly include three aspects: temperature, humidity and cleanliness. If the working environment of offset workshop is unreasonable, it may bring some practical difficulties and process faults to offset production.
1 impact of cleanliness of working environment
First of all, the production workshop should be clean and dust-free. Dust is the main cause of Zui's excessive pinhole leakage. When printing, if there is much dust in the workshop, it is easy to be adsorbed on the surface of substrate and plate, and even mixed with ink, the mesh will be blocked during printing, so that normal printing cannot be carried out.
The influence of temperature and humidity on substrate
The water content of paper changes with the change of environment temperature and humidity. The water absorption and loss capacity of paper is related to its own properties, structure and raw materials. Generally speaking, the higher the density of paper, the longer the fiber, the higher the sizing degree, the lower the water content. vice versa. The moisture content of paper produced by paper mills is usually 5-7. In the process of paper transportation, storage and printing, with the change of environmental temperature and humidity, the moisture content will increase or decrease, which is harmful to offset printing.
1) Water absorption of paper
After absorbing water, the density of the paper decreases, the fiber gap increases, the paper deformation is "lotus leaf edge", the four sides are undulating and warping. The difficulty that this kind of deformed paper brings to offset printing is: for the machine with the bottom front gauge, it is difficult to enter the front gauge because of the fluctuation of the paper's mouth. In order to achieve the purpose, the operator is bound to increase the pressure on the paper pieces, resulting in the side gauge not in place, the overprinter is not correct, and even the paper will directly enter the printing unit beyond the front gauge, resulting in the damage of the printing plate, blanket, etc Barriers. For the swing up front gauge machine, when the convex part of the paper enters the front gauge, it collides with the front gauge's paper tongue and pad, resulting in the paper not in place and affecting the overprinter accuracy. At the same time, the paper drag slightly uneven, but also to Feida normal separation of paper brings a certain degree of difficulty.
Under the condition of a certain tension in the printing process, the higher the printing speed, the greater the degree of trademark bending; on the contrary, the higher the printing speed, the greater the tension, the greater the trademark bending. In order to give full play to the efficiency of the equipment in production, the problem of trademark bending can not be solved by reducing the speed of the vehicle, so it is necessary to select the tension parameters reasonably to solve the quality problem. For example, in the operation, the speed is 130m / min, the tension before pulling force is 20dan, and the tension after pulling force is 35dan, which is an ideal parameter. As for the selection of actual parameters, it can be adjusted according to the printing effect.
The influence of drying temperature and air volume
The higher the temperature in the drying oven is, the better the printing process will be. However, if the temperature is too high, the trademark will be bent. Therefore, for the hierarchical printing, the temperature is generally stabilized at 55 ℃ ~ 90 ℃, and the air inlet pressure and air outlet pressure of the drying oven must be balanced. If the exhaust air volume is too large, the film shrinks strongly and the trademark bends seriously.
Drum is the heart of offset press. After three or five years of use, many offset press will have drum beat out of tolerance. Drum beat will cause ink bar and double shadow on the printed matter, and the printing plate's printing resistance will be reduced, thus affecting the quality of the printed matter. Therefore, we should take seriously the machines with large drum runout and solve the problems in time. During the disassembly and inspection of the overhaul machine or finishing machine, it was found that the large drum runout was mainly due to the serious rust corrosion of the eccentric sleeve and the wall panel hole, the elongated wall panel hole, and the abrasion of the wall panel hole along the stress direction into an ellipse, which resulted in the runout out exceeding the tolerance. There are many reasons for wear and tear. The main reason of Zui is the material and use problems of the wall panel. The repair method mostly uses the wall panel boring insert to repair, but the boring insert printing machine needs to be disassembled and assembled once, which requires a long cycle, does not affect production, and costs a lot of money. Therefore, it is necessary to find out the causes and take measures as soon as possible.
Six
4. Zero print limit. Due to the cost of printing plate and the limitation of printing process of traditional printing machine, the start-up fee and the quantity of starting printing are the premise of receiving orders in traditional printing mode. In short, if you only produce one carton, the cost of traditional printing may be several to ten thousand yuan. Digital printing has no starting limit. Even if only one carton is printed, the cost is almost the same as mass production.
5. Fast printing speed. The printing speed of flat industrial digital press has reached 625 m2 / h. In the process of sample preparation, traditional printing needs a tedious process such as plate making, adjusting equipment, ink adjusting, etc., which needs at least one day. The digital printing machine can achieve the goal of standing on the spot. As long as it has the electronic manuscript of pictures and texts, the manuscript of 5 square meters can be printed in 1 minute.
"Kill three birds with one stone" corrugated packaging digital printing business
Digital printing technology has existed for a long time, but the application of industrial printing on corrugated boxes in China is rare. Managers of corrugated packaging enterprises all know the fact that small orders and replenishment orders are important factors affecting the release of equipment capacity, and the way to effectively solve this problem is digital printing. With the gradual combination of digital printing technology and corrugated packaging industry, the development of this printing method in the corrugated packaging industry will surely lead the transformation of the corrugated packaging industry.
One
Creativity in new printing materials
Through the glass printing technology, painters can have better performance.
Painters can display and sell paintings on dining tables, coffee tables, shower doors, glass toll booths, glass plates and other things, and combine them with artistic expression. With the development of UV printing, they have found a new "canvas".
At present, another popular application of Zui is to print a unique architectural sign on the glass that can be used inside the office building and reception area.
Printing process
Painters and interior designers have found that printing glass on the opposite side is a very effective method without the use of tackifiers. Printing on the opposite side, or "second surface printing", allows Zui end products to be protected by the glass itself.
Without coating glass, UV printing can also be successfully carried out on glass.
Printing on glass with low curing light, and then solidifying the printed matter with non printing channel, "double printing" glass printed matter, or glass etching is used to replace the addition of tackifier or liquid coating layer, which are all methods to protect glass.
In the traditional printing process, each page takes up a piece of film when it is output. Although films of different sizes and models are sold on the market, there is still a problem of wasting film. In order to improve the productivity and quality of printing process, Huaguang mosaic folding software provides powerful functions of automatic, manual mosaic and automatic folding. In this way, the user can automatically and manually drag the specified or arbitrary typesetting results into a piece of film for output, thus saving the film.
Once paper has static electricity, it will bring a lot of trouble to printing. First, the paper can't be collimated. Under the action of static electricity, paper and paper are firmly attracted and uneven, and air is difficult to enter the paper. If you want to collide with each other, sometimes you have to pull them apart one by one, which is a waste of time. In the printing process, due to electrostatic attraction, single sheets of paper are firmly pasted together, sometimes two sheets, sometimes several sheets, sometimes a stack of paper can not be separated, resulting in the separation nozzle can not absorb paper. When the pressure of the brush is heavy, it often produces broken and empty pieces; when the pressure of the brush is light, it also produces two or more pieces. When multiple sheets of paper enter between the rubber drum and the embossing drum, the car will be blocked and the blanket and pad will be damaged. The paper with static electricity is not smooth when it is transported forward on the paper feeding table, and it is not straight and positioned correctly when it reaches the front gauge, resulting in the second overprint being unable to register, poor product quality and great waste. Even after the stamping part, the paper receiving is also very uneven, which brings great trouble to the second whole paper and seriously affects the production speed.
Paper with static electricity and papermaking has a certain relationship. In general, the base paper is less electrified when leaving the factory, and the probability of copper plate paper electrified is also small. Because printing paper (white board paper, paper jam, etc.) and copper plate paper are reprocessed on the basis of base paper, even if the base paper has been charged, it will be eliminated in the process of processing. Generally, the paper with a fixed weight of less than 80g / m2 has more static electricity, but it is not obvious that the paper has static electricity before printing or before printing, which is usually a sudden increase of static electricity after pressing. In the process of offset printing, due to the presence of water, there are not many people with static electricity after printing. For offset printing, static electricity is mainly generated before printing.
Four
The working environment is the basic condition to achieve the ideal printing effect. The working environment problems mainly include three aspects: temperature, humidity and cleanliness. If the working environment of offset workshop is unreasonable, it may bring some practical difficulties and process faults to offset production.
1 impact of cleanliness of working environment
First of all, the production workshop should be clean and dust-free. Dust is the main cause of Zui's excessive pinhole leakage. When printing, if there is much dust in the workshop, it is easy to be adsorbed on the surface of substrate and plate, and even mixed with ink, the mesh will be blocked during printing, so that normal printing cannot be carried out.
The influence of temperature and humidity on substrate
The water content of paper changes with the change of environment temperature and humidity. The water absorption and loss capacity of paper is related to its own properties, structure and raw materials. Generally speaking, the higher the density of paper, the longer the fiber, the higher the sizing degree, the lower the water content. vice versa. The moisture content of paper produced by paper mills is usually 5-7. In the process of paper transportation, storage and printing, with the change of environmental temperature and humidity, the moisture content will increase or decrease, which is harmful to offset printing.
1) Water absorption of paper
After absorbing water, the density of the paper decreases, the fiber gap increases, the paper deformation is "lotus leaf edge", the four sides are undulating and warping. The difficulty that this kind of deformed paper brings to offset printing is: for the machine with the bottom front gauge, it is difficult to enter the front gauge because of the fluctuation of the paper's mouth. In order to achieve the purpose, the operator is bound to increase the pressure on the paper pieces, resulting in the side gauge not in place, the overprinter is not correct, and even the paper will directly enter the printing unit beyond the front gauge, resulting in the damage of the printing plate, blanket, etc Barriers. For the swing up front gauge machine, when the convex part of the paper enters the front gauge, it collides with the front gauge's paper tongue and pad, resulting in the paper not in place and affecting the overprinter accuracy. At the same time, the paper drag slightly uneven, but also to Feida normal separation of paper brings a certain degree of difficulty.