The first section of the professional knowledge of the printing process Introduction The main key process of packaging and printing is the plain printing. The main problem with plain printing is that the quality of the product is unstable and there are good times. The root cause of this phenomenon lies in the management of the enterprise—standardization, data management, and the professionalism of technical managers, especially those who operate on offset presses. There are many skilled workers in Guangdong who have many years of practical operation experience. The key to their further improvement lies in systematically understanding and mastering the professional technical theories.
The problems faced by Guangdong's packaging and printing industry after its accession to the WTO are: Packaging design and print quality have reached first-rate international standards to meet the needs of the international market. Peers must be aware of people and have appropriate countermeasures to make the benefits of WTO entry on the industry better than harm.
In order to make the packaging and printing industry more adaptable to the severe challenges after its accession to the WTO, we will only give lectures on the causes and solutions to the main quality problems of the typographical processes, offset press structures, printing colors, and typographical products that were toured by printing companies in various parts of Guangdong in recent years. In accordance with the "practical, necessary, systematic, refined" principle, compiled as "lithographic technology management personnel and lithographic offset technology necessary professional knowledge workers 1-18", sub-periodical. Looking forward, we can help improve the professional quality of Guangdong Pingyin industry technical team.
First, the professional knowledge of the printing process, the method of coordinating the offset printing and the printing process As the prepress process has become more specialized, Guangdong Printing Factory, the main process mostly for printing - offset - India. The printing process has a great influence on the quality of printed products, which often leads to conflicts with the next process. Effectively doing a good job in the data-based operation of the printing process is an urgent task for the provincial printing companies.
Second, the meaning of commonly used terms in India
Hierarchy - light illuminates the object, showing the form, color, light and shade. The object shows a continuous halo of dark to light or light to dark, and is expressed on the printed matter by the size of the dots to form a shade of gray. This shade of tone is called hierarchy.
Deep - refers to the process of network transfer, that is, the transfer from the positive image to the printing plate, or from the printing plate to the printed sheet, and the corresponding network is fully expanded.
Shallow—Ibid, the corresponding outlets are reduced.
Flat - Same as above, the corresponding outlets, small outlets expand, and the large outlets remain unchanged, so that the contrast of the picture adjustment is compressed.
å´ å´ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ , , , , , , ,. Loss of hierarchy.
Density - Exposure of the photosensitive film to black levels after development. The greater the density, the darker the black.
Contrast—refers to the difference between the maximum and minimum density of the picture.
Highlight - refers to the area where the printed sheet is 0î€1-1.
High-key – refers to the area of ​​the 1-3 screened area of ​​the print sheet.
Midtones—The area that guides the screen 4-6 into a halftone dot.
Low-key – refers to the area of ​​the printed image 7-9 screen.
Continuous tone - reflects the picture level by density.
Halftoning - The screen hierarchy is reflected by the outlets.
Third, the printing plate must be prepared on the test line, color standard, control bar 1. School Edition + word line: color overlay standard, the error should be in the range of 0.05 to 0.1 mm.
2. Drag the cross line: located in the middle point outside the tangent line, distinguish the bite and the tip, which is favorable for printing.
3. Bite mouth midline: Located in the middle of the mouth outside the tangent bite, distinguish between bite and tip, favorable loading.
4. Outer corner line: 3mm outside the tangent of the four corners of the printing plate, as the basis for the corner size when the first color is calibrated, it is also the standard for setting the cutting position.
5. Inner corner: finished product specifications cutting line.
6. Color mark: located outside the tangent line on the side of the needle, consists of four blocks of yellow, red, blue and black. It is used to check the color leakage and needle position mark, which is conducive to align paper and beer cutting process.
7. Control strips: Control the quality of printed products. Placed outside the tangent line.
Fourth, the print job requirements for the printing plate 1. Cross line alignment, does not allow errors. Test with a magnifying glass.
2. The size of both sides of the mouth is the same; the size of the mouth meets the printing machine requirements.
3. The blank part of the printing plate is free from dirt and has good hydrophilicity.
4. The graphic and textual parts have good ink absorption performance; the dots are strong and smooth; the text is clear, unambiguous, and free from the demarcation; the field is flat and firm and does not reveal the bottom line; the flat screen is even and smooth, with no unevenness.
5. Reproduces the tone of the shades of positive shades.
6. The detection line is complete.
7.15 times the magnifying glass detection, 3% of the visible network, 5% of the network just spelled angle.
Fifth, the factors affecting the print quality 1. PS version should be from the six major aspects, the quality of the PS version of the identification: sand water storage, the quality of the oxide layer, photosensitive layer quality, photographic performance, ink and hydrophilic properties.
From the perspective of the printing process, the PS version must have the following advantages:
The photoreceptor layer has high resolution, rich layers, smooth and solid dots, good ink absorption, good ink transfer performance, good repeatability, wear resistance of the oxide film, and good hydrophilic and oil-repellent properties.
Half-tone printing plates, printing rate should reach at least 50000 India.
2. Shaiban light source lighting source, to consider two factors:
The emitted spectrum is consistent with the PS version of the absorption spectrum. The emitted spectrum can pass through the glass.
In recent years, the most popular among the printing industry is the iodine lamp, which has a radiation spectrum between 350 and 450 μM. Matches the best spectral sensitivity required for the PS plate.
Generally about 3000W is appropriate, the wattage increases, and the exposure time is relatively shortened.
Note that the lamp distance adjustment complies with the specification.
3 exposure time length.
Generally controlled between 60 ~ 120S. (According to the use of media performance test shall prevail). Small outlets, low density, relatively short time. Fields, coarse nets, and yellow flakes are relatively long.
Control the exposure of the two expression methods: 1. The length of exposure. 2. How much light flux is input?
Luminous flux F reflects the amount of light energy passing through a certain area per unit time, and the unit is “lumensâ€.
Illuminance E, the physical quantity that reflects the degree of illumination of the surface of the object:
Illumination unit: lumens/meter 2, also known as lux.
Various PS versions have a continuously adjusted version of the scale that controls exposure.
The problems faced by Guangdong's packaging and printing industry after its accession to the WTO are: Packaging design and print quality have reached first-rate international standards to meet the needs of the international market. Peers must be aware of people and have appropriate countermeasures to make the benefits of WTO entry on the industry better than harm.
In order to make the packaging and printing industry more adaptable to the severe challenges after its accession to the WTO, we will only give lectures on the causes and solutions to the main quality problems of the typographical processes, offset press structures, printing colors, and typographical products that were toured by printing companies in various parts of Guangdong in recent years. In accordance with the "practical, necessary, systematic, refined" principle, compiled as "lithographic technology management personnel and lithographic offset technology necessary professional knowledge workers 1-18", sub-periodical. Looking forward, we can help improve the professional quality of Guangdong Pingyin industry technical team.
First, the professional knowledge of the printing process, the method of coordinating the offset printing and the printing process As the prepress process has become more specialized, Guangdong Printing Factory, the main process mostly for printing - offset - India. The printing process has a great influence on the quality of printed products, which often leads to conflicts with the next process. Effectively doing a good job in the data-based operation of the printing process is an urgent task for the provincial printing companies.
Second, the meaning of commonly used terms in India
Hierarchy - light illuminates the object, showing the form, color, light and shade. The object shows a continuous halo of dark to light or light to dark, and is expressed on the printed matter by the size of the dots to form a shade of gray. This shade of tone is called hierarchy.
Deep - refers to the process of network transfer, that is, the transfer from the positive image to the printing plate, or from the printing plate to the printed sheet, and the corresponding network is fully expanded.
Shallow—Ibid, the corresponding outlets are reduced.
Flat - Same as above, the corresponding outlets, small outlets expand, and the large outlets remain unchanged, so that the contrast of the picture adjustment is compressed.
å´ å´ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ åŒ , , , , , , ,. Loss of hierarchy.
Density - Exposure of the photosensitive film to black levels after development. The greater the density, the darker the black.
Contrast—refers to the difference between the maximum and minimum density of the picture.
Highlight - refers to the area where the printed sheet is 0î€1-1.
High-key – refers to the area of ​​the 1-3 screened area of ​​the print sheet.
Midtones—The area that guides the screen 4-6 into a halftone dot.
Low-key – refers to the area of ​​the printed image 7-9 screen.
Continuous tone - reflects the picture level by density.
Halftoning - The screen hierarchy is reflected by the outlets.
Third, the printing plate must be prepared on the test line, color standard, control bar 1. School Edition + word line: color overlay standard, the error should be in the range of 0.05 to 0.1 mm.
2. Drag the cross line: located in the middle point outside the tangent line, distinguish the bite and the tip, which is favorable for printing.
3. Bite mouth midline: Located in the middle of the mouth outside the tangent bite, distinguish between bite and tip, favorable loading.
4. Outer corner line: 3mm outside the tangent of the four corners of the printing plate, as the basis for the corner size when the first color is calibrated, it is also the standard for setting the cutting position.
5. Inner corner: finished product specifications cutting line.
6. Color mark: located outside the tangent line on the side of the needle, consists of four blocks of yellow, red, blue and black. It is used to check the color leakage and needle position mark, which is conducive to align paper and beer cutting process.
7. Control strips: Control the quality of printed products. Placed outside the tangent line.
Fourth, the print job requirements for the printing plate 1. Cross line alignment, does not allow errors. Test with a magnifying glass.
2. The size of both sides of the mouth is the same; the size of the mouth meets the printing machine requirements.
3. The blank part of the printing plate is free from dirt and has good hydrophilicity.
4. The graphic and textual parts have good ink absorption performance; the dots are strong and smooth; the text is clear, unambiguous, and free from the demarcation; the field is flat and firm and does not reveal the bottom line; the flat screen is even and smooth, with no unevenness.
5. Reproduces the tone of the shades of positive shades.
6. The detection line is complete.
7.15 times the magnifying glass detection, 3% of the visible network, 5% of the network just spelled angle.
Fifth, the factors affecting the print quality 1. PS version should be from the six major aspects, the quality of the PS version of the identification: sand water storage, the quality of the oxide layer, photosensitive layer quality, photographic performance, ink and hydrophilic properties.
From the perspective of the printing process, the PS version must have the following advantages:
The photoreceptor layer has high resolution, rich layers, smooth and solid dots, good ink absorption, good ink transfer performance, good repeatability, wear resistance of the oxide film, and good hydrophilic and oil-repellent properties.
Half-tone printing plates, printing rate should reach at least 50000 India.
2. Shaiban light source lighting source, to consider two factors:
The emitted spectrum is consistent with the PS version of the absorption spectrum. The emitted spectrum can pass through the glass.
In recent years, the most popular among the printing industry is the iodine lamp, which has a radiation spectrum between 350 and 450 μM. Matches the best spectral sensitivity required for the PS plate.
Generally about 3000W is appropriate, the wattage increases, and the exposure time is relatively shortened.
Note that the lamp distance adjustment complies with the specification.
3 exposure time length.
Generally controlled between 60 ~ 120S. (According to the use of media performance test shall prevail). Small outlets, low density, relatively short time. Fields, coarse nets, and yellow flakes are relatively long.
Control the exposure of the two expression methods: 1. The length of exposure. 2. How much light flux is input?
Luminous flux F reflects the amount of light energy passing through a certain area per unit time, and the unit is “lumensâ€.
Illuminance E, the physical quantity that reflects the degree of illumination of the surface of the object:
Illumination unit: lumens/meter 2, also known as lux.
Various PS versions have a continuously adjusted version of the scale that controls exposure.
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