The hottest topic in the contemporary printing industry is the computer-to-plate (CTP) technology. The CTP is in line with the trend of electronic, information, high-speed, and high-quality in the world today. Although CTP technology has the advantages of simplifying processes, saving film, improving ergonomics, and improving quality, compared with phototaking technology, it also has many constraints, such as 1. The CTP plate has not yet been manufactured, and the import price is too high. 2, from the printing effect point of view, CTP and the film made PS version is not much difference, quality and price has no obvious advantage; 3, CTP requires the entire layout information must be digitized before printing, typesetting system to be equipped with high-performance imposition software; 4, CTP must use digital proofing. Due to the above reasons, CTP technology has not been widely applied in China.
Our institute is an urban surveying and surveying institute affiliated to the Urban Planning Administration of Urumqi City. Its main task is to provide topographic maps for urban construction. Its characteristics are that the drawings are updated quickly, the number of prints is small, and the mapping cycle is short. In the past, the flow chart of the topographic map in our hospital is shown in Figure 1.
Original Pencil Drawing - Computer Flat Mining Digitization - Inspection - Platform Plotter Drawing - Original Version - Sun PS Printing In this process, flat mining digital and platform plotter drawing takes a long time. Color maps have a longer charting cycle, and the accuracy of maps does not meet the requirements. The cost is also very high. Therefore, based on actual conditions, equipment conditions, and CTP implications, we believe that we should make full use of the conditions of existing equipment and data, and take a road that is suitable for ourselves, so as to shorten the mapping cycle and reduce the cost in the mapping process. the goal of.
In 1997, our institute completed the RS project (remote sensing technology) - a 1:500 aerial survey of Urumqi city. In view of the existing equipment and data of our hospital, we conducted analysis and demonstration, first shortened the mapping period, and improved the prepress process. The operation flow is shown in Figure 2:
Aerial survey digitized information map - Computer check and correction - HP750C spray plotter - Sun PS printing through the proof of theory and practice, improved workflow, and strive to reduce costs. In the past printing process, the original image was generally made of film or polyester film. On the one hand, these materials were easy to store, and on the other hand, the deformation was very small. However, we now have all digital information stored in computers. The plans used for printing are not used for one-time use. Therefore, the use of the above two materials will increase the cost. In view of this situation, after careful study, we decided to use sulphuric acid paper (commonly known as transparent paper) as its raw material because of its low price and transparency in full compliance with the printing requirements. However, the stability of sulfuric acid paper is poor, and the stretching is very large. The topographic map printing has strict requirements on the dimensional deformation. The error of one side of the map is 0.2mm, the diagonal error is 0.3mm, and the error of the same direction of the elements is not greater than 0.1mm, so sulfuric acid paper has not been used in topographic mapping. If we grasp the deformation law of sulfuric acid paper and its stretching factor, we can meet the requirements of the map printing specification.
After careful analysis, we found that the deformation of sulfate paper is mainly caused by the change in water content. Because the sulfate paper is highly absorbent, changes in temperature and humidity can affect the moisture content of the paper. The relative humidity of air is proportional to the moisture content of the paper, as shown in Figure 3.
When the relative humidity in the air is constant, as the temperature increases, the moisture content in the paper decreases, so the temperature is inversely proportional to the water content, as shown in FIG. 4 .
Based on the above rules, we set out to test and explore the deformation laws of sulfuric acid paper. First, we sprayed a 50cm x 50cm sulfuric acid paper square grid in the computer room and placed it at room temperature for a certain period of time. The analytical method was used to solve the vertical and horizontal deformation coefficients of the sulfuric acid paper, and then returned to the computer room, according to the sulfuric acid. Vertical and horizontal deformation coefficients of the paper, set different deformation coefficients in the computer inkjet drawing parameter setting block. Then, a 50cm×50cm sulfuric acid paper grid pattern is inspected and the deformation of sulfuric acid paper is detected at room temperature using a precision Geneva steel ruler. The square grid edge error shall not be greater than plus or minus 0.15mm, and the diagonal length shall not exceed positive and negative. 0.2mm. Through repeated trials and experiments, we have obtained vertical and horizontal extension coefficients of sulfuric acid paper deformation that meet different temperature and humidity conditions (ie spring, summer, autumn, and winter) under dimensional deformation conditions. After the difficulties, the work can be carried out smoothly.
The first step: In the computer room with a computer on the HP750C inkjet plotter inkjet 1:500 aerial digital topographic map. According to the room temperature conditions, according to the paper stretching coefficient of sulfuric acid paper set the corresponding drawing parameters, inkjet digital map of the topography of 1:500 sulfuric acid paper, and sent to the next process.
Step 2: Under the room temperature conditions of the printing room, use a precision Geneva steel rule to check whether the digital terrain map of 1:500 sulfuric acid paper satisfies the "Urban Measurement Specification" (C118-85) and "Map Printing Specification" (GB/T14511- 13) The dimensional deformation tolerance requirement is transferred to the next process after passing the qualification.
Step 3: In the printing shop, use the 1:500 sulfuric acid paper that meets the accuracy requirements to digitally measure the bottomographic map of the topographic map, perform the printing of the PS plate on the printing machine, and then use the precision Geneva steel ruler to test the sun-dried PS plate. Size accuracy. If you meet the technical requirements, you can deliver the print, otherwise you will have to remake the plate.
Step 4: In the printing room, use the qualified 1:500 aerial surveying topographic map PS plate to print on the offset press, and then use the precision Geneva ruler to check whether the finished drawing meets the accuracy requirement. Satisfy the accuracy index as a qualified product, otherwise it is a nonconforming product.
Through more than one year of production practice, from the point of view of the feedback of finished products and the quality of printing plans, it fully meets the requirements of the specification. At the same time, it also satisfies the planning requirements of short drawing cycle and rapid updating of drawings, and is well received by the construction unit. . We deeply understand the application of high technology, which not only greatly simplifies the production process, shortens the production cycle, reduces the production cost, and improves the quality of the product, but also makes us realize that with the development of high technology, the process designer Increasingly demanding. Process designers are demanding more and more. Process design can not be limited to only one aspect of knowledge, but should be a multi-faceted knowledge, but should be a graphic designer with a variety of knowledge, not only to understand computer knowledge, but also to understand printing, color science And maps. Only with the above process plan is scientific and reasonable. At the same time, it also made us more clearly realize that the realization of computerization and the replacement of traditional manual drawing and plate making are necessarily the trend of the times and the requirements of the information revolution. Only making full use of high and new technology and high-tech equipment will be the inevitable trend of map printing and printing in the future.
Our institute is an urban surveying and surveying institute affiliated to the Urban Planning Administration of Urumqi City. Its main task is to provide topographic maps for urban construction. Its characteristics are that the drawings are updated quickly, the number of prints is small, and the mapping cycle is short. In the past, the flow chart of the topographic map in our hospital is shown in Figure 1.
Original Pencil Drawing - Computer Flat Mining Digitization - Inspection - Platform Plotter Drawing - Original Version - Sun PS Printing In this process, flat mining digital and platform plotter drawing takes a long time. Color maps have a longer charting cycle, and the accuracy of maps does not meet the requirements. The cost is also very high. Therefore, based on actual conditions, equipment conditions, and CTP implications, we believe that we should make full use of the conditions of existing equipment and data, and take a road that is suitable for ourselves, so as to shorten the mapping cycle and reduce the cost in the mapping process. the goal of.
In 1997, our institute completed the RS project (remote sensing technology) - a 1:500 aerial survey of Urumqi city. In view of the existing equipment and data of our hospital, we conducted analysis and demonstration, first shortened the mapping period, and improved the prepress process. The operation flow is shown in Figure 2:
Aerial survey digitized information map - Computer check and correction - HP750C spray plotter - Sun PS printing through the proof of theory and practice, improved workflow, and strive to reduce costs. In the past printing process, the original image was generally made of film or polyester film. On the one hand, these materials were easy to store, and on the other hand, the deformation was very small. However, we now have all digital information stored in computers. The plans used for printing are not used for one-time use. Therefore, the use of the above two materials will increase the cost. In view of this situation, after careful study, we decided to use sulphuric acid paper (commonly known as transparent paper) as its raw material because of its low price and transparency in full compliance with the printing requirements. However, the stability of sulfuric acid paper is poor, and the stretching is very large. The topographic map printing has strict requirements on the dimensional deformation. The error of one side of the map is 0.2mm, the diagonal error is 0.3mm, and the error of the same direction of the elements is not greater than 0.1mm, so sulfuric acid paper has not been used in topographic mapping. If we grasp the deformation law of sulfuric acid paper and its stretching factor, we can meet the requirements of the map printing specification.
After careful analysis, we found that the deformation of sulfate paper is mainly caused by the change in water content. Because the sulfate paper is highly absorbent, changes in temperature and humidity can affect the moisture content of the paper. The relative humidity of air is proportional to the moisture content of the paper, as shown in Figure 3.
When the relative humidity in the air is constant, as the temperature increases, the moisture content in the paper decreases, so the temperature is inversely proportional to the water content, as shown in FIG. 4 .
Based on the above rules, we set out to test and explore the deformation laws of sulfuric acid paper. First, we sprayed a 50cm x 50cm sulfuric acid paper square grid in the computer room and placed it at room temperature for a certain period of time. The analytical method was used to solve the vertical and horizontal deformation coefficients of the sulfuric acid paper, and then returned to the computer room, according to the sulfuric acid. Vertical and horizontal deformation coefficients of the paper, set different deformation coefficients in the computer inkjet drawing parameter setting block. Then, a 50cm×50cm sulfuric acid paper grid pattern is inspected and the deformation of sulfuric acid paper is detected at room temperature using a precision Geneva steel ruler. The square grid edge error shall not be greater than plus or minus 0.15mm, and the diagonal length shall not exceed positive and negative. 0.2mm. Through repeated trials and experiments, we have obtained vertical and horizontal extension coefficients of sulfuric acid paper deformation that meet different temperature and humidity conditions (ie spring, summer, autumn, and winter) under dimensional deformation conditions. After the difficulties, the work can be carried out smoothly.
The first step: In the computer room with a computer on the HP750C inkjet plotter inkjet 1:500 aerial digital topographic map. According to the room temperature conditions, according to the paper stretching coefficient of sulfuric acid paper set the corresponding drawing parameters, inkjet digital map of the topography of 1:500 sulfuric acid paper, and sent to the next process.
Step 2: Under the room temperature conditions of the printing room, use a precision Geneva steel rule to check whether the digital terrain map of 1:500 sulfuric acid paper satisfies the "Urban Measurement Specification" (C118-85) and "Map Printing Specification" (GB/T14511- 13) The dimensional deformation tolerance requirement is transferred to the next process after passing the qualification.
Step 3: In the printing shop, use the 1:500 sulfuric acid paper that meets the accuracy requirements to digitally measure the bottomographic map of the topographic map, perform the printing of the PS plate on the printing machine, and then use the precision Geneva steel ruler to test the sun-dried PS plate. Size accuracy. If you meet the technical requirements, you can deliver the print, otherwise you will have to remake the plate.
Step 4: In the printing room, use the qualified 1:500 aerial surveying topographic map PS plate to print on the offset press, and then use the precision Geneva ruler to check whether the finished drawing meets the accuracy requirement. Satisfy the accuracy index as a qualified product, otherwise it is a nonconforming product.
Through more than one year of production practice, from the point of view of the feedback of finished products and the quality of printing plans, it fully meets the requirements of the specification. At the same time, it also satisfies the planning requirements of short drawing cycle and rapid updating of drawings, and is well received by the construction unit. . We deeply understand the application of high technology, which not only greatly simplifies the production process, shortens the production cycle, reduces the production cost, and improves the quality of the product, but also makes us realize that with the development of high technology, the process designer Increasingly demanding. Process designers are demanding more and more. Process design can not be limited to only one aspect of knowledge, but should be a multi-faceted knowledge, but should be a graphic designer with a variety of knowledge, not only to understand computer knowledge, but also to understand printing, color science And maps. Only with the above process plan is scientific and reasonable. At the same time, it also made us more clearly realize that the realization of computerization and the replacement of traditional manual drawing and plate making are necessarily the trend of the times and the requirements of the information revolution. Only making full use of high and new technology and high-tech equipment will be the inevitable trend of map printing and printing in the future.
Electric Foot Grinder,Feet Grinder,Foot Grinder Machine,Foot Grinder Electric
Foshan Liqia Hardware Products Co., Ltd. , https://www.liqiamei.com