Film is a medium for printing and plate making, and it is also one of the important conditions that affect the quality of original reproduction. At the time of printing, only the film direction of the film is correct, so as to ensure that the density of the copied layout and the film are consistent with each other, so that the small dots, lines, characters and other parts of the layout are clearly printed, which meets the requirements of product printing quality.
However, if there is an error in the film output or manual imposition, the film of the film is facing upward when the film is printed, and the film is not directly in contact with the printing plate. Since the transparent substrate has a certain thickness, when the printing plate is exposed, the dots are Small lines and margins of text layout are prone to trace light transmission. The quality of the original cannot be faithfully reproduced during plate making, resulting in a decrease in the density of the printed graphic and a slight deterioration in the printing. Therefore, the brochure design template, in the film output and artificial imposition, must pay attention to the film direction of the film.
The solution to the printing quality problem caused by the pre-press platen error was once. Due to the sporadic film provided by the customer, the output was set incorrectly so that the film direction was upward, and the beverage bottle and the imposition personnel did not carefully check and correctly identify the direction of the film. After the artificial imposition, the film will be delivered to the next process. When printing in this way, due to the lack of experience of quality control by the operator, after the four-color printing of the semi-finished product, the color of the dot printing of the 20% blue flat screen surface is obviously weak, and the color of the whole printed sheet is obviously insufficient compared with the original. The semi-finished product was judged to be a non-conforming product.
After careful analysis of the printed semi-finished products, a remedial solution was developed. The specific method is: the solid line and the text layout in the printing plate are repaired with the sizing solution, and only 20% of the flat screen stencil is set and then printed again, so that the C color is printed once after the partial layout is printed. The semi-finished product, the printing color of the overall layout is close to the original, the remedial solution has achieved a successful process effect, the quality of the product has been recognized by the customer, avoiding economic losses.
Technical analysis of the printing quality problem caused by the wrong direction of the film of the film The above-mentioned printing quality problem caused by the wrong direction of the film of the film has exposed the outstanding problems from the pre-press to the printing process.
First, the electronic output producers are not serious enough or have insufficient understanding of the exposure process, and there is a certain blindness in the production of the flat net;
Second, there is a mistake in the practice of imposition of the film inspection method. When the imposition is used, it is often accustomed to simply rely on the text direction of the layout to determine the film surface of the film (that is, the direction of the film).
Third, the printing process did not promptly check and find the film error problem;
Fourth, when the printing process adjusts the amount of ink, it satisfies the saturation of the solid lines and the text layout, and does not have a dirty version or a paste. The flat screen color still appears to be slightly light, ignoring the quality of the printing plate. Inspection and identification, blind printing caused the above print quality problems.
The correct understanding of the composition of the film generally film film is composed of a film base and a photosensitive film, wherein the transparent film is used to support the photosensitive film, the photosensitive film is a chemical coating layer of the emulsion, they It consists of some photosensitive crystal particles. The film on the film can only be seen under the microscope.
The imaging principle of the film is that the crystal particles on the film change their structure and combine with other crystals to form a block. The more light is projected on the film of the film, the more the crystal changes and forms. Therefore, when different light is irradiated on the film, different numbers and sizes and shapes of the crystals of the structure are formed, thereby forming an image that is not yet visible, and then the development process can transform the potential image on the film into a stereotype. Visible image.
The production process shows that the density of the film on the image of the photosensitive part of the film is large, the density of the film on the image with less light is small, and the part without the light is completely transparent. Generally, the development time of the film is long, and the film of the film is correspondingly thick. On the contrary, the film of the film is thin, which is the basic feature of the film making process effect.
The identification method of the film direction of the film for the pre-press process production and inspection personnel, the identification of the direction of the film of the film is the basic work that must be mastered, only to do a good job can effectively reduce or avoid errors in the work, to ensure the quality of production.
The identification methods of film film at the production site generally include: manual scratch film recognition method and macroscopic observation identification method. The artificial scraping film identifies the film surface of the film, that is, the blade is scraped on the film other than the printed product. If the film is scratched, the light is scratched at the scratch, indicating that the surface is the film surface.
The method of observing and identifying with the naked eye is that the film surface of the film is relatively dark, and the film surface (base surface) of the film is relatively bright and has a distinct mirror effect. If the film is identified by the same screen version of the film, when the film of the film is facing upwards, the film has a dim feeling, and the density of the dots is relatively large, and when the film is facing down for visual inspection, it feels The film is brighter, more lustrous, and the dot density is also small.
The identification method of the size of the film outlets If the film is printed on the screen, the film surface of the film is not in direct contact with the surface of the plate, and the dots formed by the sun will appear small, which will affect the quality of the product. Therefore, the printing and printing personnel must learn to use the naked eye to identify commonly used outlets. In this way, if the film surface of the film is wrong when the printing plate is used, the plate dot becomes significantly smaller, and by checking the printing plate or printing the sample, the error of the printing plate can be found.
Generally, 1 to 10% of the dots are commonly used, and are also easy to identify with the naked eye. Identifying the number of dots within 50% is identified based on the number of particles that can accommodate the same dot in the gap between the two dots. That is, in the gap between the two mesh points on the opposite side, three equally-sized dots can be placed, which is 10% of the dots; if within the distance between the two dots, two equally large dots can be accommodated, called 2 Networking point; and within the distance between the two network points, can accommodate 1.5 equally large dots, called 3 into the network; if the two dots can accommodate l.25 of the same size of the dots, it is called 40% The dot; if there is one dot of the same size between the two dots, that is, the printing dot and the white dot in each unit area are half, which is 50%. The 50% discrimination based on the Internet point is measured by how many white dots of the same size can be accommodated between the two white points on the opposite side. Judging from the regular performance of the number of dots, the number of dots accommodated in the distance between two white dots is exactly 60% and 4%; 7% is the same as 3%; 8% is the same as 2%; 9% is the same as 1% . 10% of the network points are the real version, fashion t-shirt, if the layout is the field version, because there is no dot gap, there is no oblique light transmission phenomenon, so the field version of the film of the film upwards, will not affect the field layout The density of the printing plate.
Therefore, a correct understanding of the characteristics of the film and a number of factors affecting the quality of the plate copy, and carefully take the film output, printing process and quality inspection control technology, not only can reduce or avoid the quality problems of the pre-press process, but also better Guarantee the printing quality of the product.
However, if there is an error in the film output or manual imposition, the film of the film is facing upward when the film is printed, and the film is not directly in contact with the printing plate. Since the transparent substrate has a certain thickness, when the printing plate is exposed, the dots are Small lines and margins of text layout are prone to trace light transmission. The quality of the original cannot be faithfully reproduced during plate making, resulting in a decrease in the density of the printed graphic and a slight deterioration in the printing. Therefore, the brochure design template, in the film output and artificial imposition, must pay attention to the film direction of the film.
The solution to the printing quality problem caused by the pre-press platen error was once. Due to the sporadic film provided by the customer, the output was set incorrectly so that the film direction was upward, and the beverage bottle and the imposition personnel did not carefully check and correctly identify the direction of the film. After the artificial imposition, the film will be delivered to the next process. When printing in this way, due to the lack of experience of quality control by the operator, after the four-color printing of the semi-finished product, the color of the dot printing of the 20% blue flat screen surface is obviously weak, and the color of the whole printed sheet is obviously insufficient compared with the original. The semi-finished product was judged to be a non-conforming product.
After careful analysis of the printed semi-finished products, a remedial solution was developed. The specific method is: the solid line and the text layout in the printing plate are repaired with the sizing solution, and only 20% of the flat screen stencil is set and then printed again, so that the C color is printed once after the partial layout is printed. The semi-finished product, the printing color of the overall layout is close to the original, the remedial solution has achieved a successful process effect, the quality of the product has been recognized by the customer, avoiding economic losses.
Technical analysis of the printing quality problem caused by the wrong direction of the film of the film The above-mentioned printing quality problem caused by the wrong direction of the film of the film has exposed the outstanding problems from the pre-press to the printing process.
First, the electronic output producers are not serious enough or have insufficient understanding of the exposure process, and there is a certain blindness in the production of the flat net;
Second, there is a mistake in the practice of imposition of the film inspection method. When the imposition is used, it is often accustomed to simply rely on the text direction of the layout to determine the film surface of the film (that is, the direction of the film).
Third, the printing process did not promptly check and find the film error problem;
Fourth, when the printing process adjusts the amount of ink, it satisfies the saturation of the solid lines and the text layout, and does not have a dirty version or a paste. The flat screen color still appears to be slightly light, ignoring the quality of the printing plate. Inspection and identification, blind printing caused the above print quality problems.
The correct understanding of the composition of the film generally film film is composed of a film base and a photosensitive film, wherein the transparent film is used to support the photosensitive film, the photosensitive film is a chemical coating layer of the emulsion, they It consists of some photosensitive crystal particles. The film on the film can only be seen under the microscope.
The imaging principle of the film is that the crystal particles on the film change their structure and combine with other crystals to form a block. The more light is projected on the film of the film, the more the crystal changes and forms. Therefore, when different light is irradiated on the film, different numbers and sizes and shapes of the crystals of the structure are formed, thereby forming an image that is not yet visible, and then the development process can transform the potential image on the film into a stereotype. Visible image.
The production process shows that the density of the film on the image of the photosensitive part of the film is large, the density of the film on the image with less light is small, and the part without the light is completely transparent. Generally, the development time of the film is long, and the film of the film is correspondingly thick. On the contrary, the film of the film is thin, which is the basic feature of the film making process effect.
The identification method of the film direction of the film for the pre-press process production and inspection personnel, the identification of the direction of the film of the film is the basic work that must be mastered, only to do a good job can effectively reduce or avoid errors in the work, to ensure the quality of production.
The identification methods of film film at the production site generally include: manual scratch film recognition method and macroscopic observation identification method. The artificial scraping film identifies the film surface of the film, that is, the blade is scraped on the film other than the printed product. If the film is scratched, the light is scratched at the scratch, indicating that the surface is the film surface.
The method of observing and identifying with the naked eye is that the film surface of the film is relatively dark, and the film surface (base surface) of the film is relatively bright and has a distinct mirror effect. If the film is identified by the same screen version of the film, when the film of the film is facing upwards, the film has a dim feeling, and the density of the dots is relatively large, and when the film is facing down for visual inspection, it feels The film is brighter, more lustrous, and the dot density is also small.
The identification method of the size of the film outlets If the film is printed on the screen, the film surface of the film is not in direct contact with the surface of the plate, and the dots formed by the sun will appear small, which will affect the quality of the product. Therefore, the printing and printing personnel must learn to use the naked eye to identify commonly used outlets. In this way, if the film surface of the film is wrong when the printing plate is used, the plate dot becomes significantly smaller, and by checking the printing plate or printing the sample, the error of the printing plate can be found.
Generally, 1 to 10% of the dots are commonly used, and are also easy to identify with the naked eye. Identifying the number of dots within 50% is identified based on the number of particles that can accommodate the same dot in the gap between the two dots. That is, in the gap between the two mesh points on the opposite side, three equally-sized dots can be placed, which is 10% of the dots; if within the distance between the two dots, two equally large dots can be accommodated, called 2 Networking point; and within the distance between the two network points, can accommodate 1.5 equally large dots, called 3 into the network; if the two dots can accommodate l.25 of the same size of the dots, it is called 40% The dot; if there is one dot of the same size between the two dots, that is, the printing dot and the white dot in each unit area are half, which is 50%. The 50% discrimination based on the Internet point is measured by how many white dots of the same size can be accommodated between the two white points on the opposite side. Judging from the regular performance of the number of dots, the number of dots accommodated in the distance between two white dots is exactly 60% and 4%; 7% is the same as 3%; 8% is the same as 2%; 9% is the same as 1% . 10% of the network points are the real version, fashion t-shirt, if the layout is the field version, because there is no dot gap, there is no oblique light transmission phenomenon, so the field version of the film of the film upwards, will not affect the field layout The density of the printing plate.
Therefore, a correct understanding of the characteristics of the film and a number of factors affecting the quality of the plate copy, and carefully take the film output, printing process and quality inspection control technology, not only can reduce or avoid the quality problems of the pre-press process, but also better Guarantee the printing quality of the product.
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