In the print production process, after the separation sheet is made from the original, proofing is usually performed. The purpose is to compare the proofs produced with the originals, and to make necessary corrections according to the originals, in order to obtain the correct reduction of color and tone. After being approved by the customer, it will be used as the standard for checking the color and level of finished products in the printing process.
The traditional proofing operation is to first dry the finished film onto the printing plate, and then mount the printing plate on the proofing machine and perform overprinting according to the appropriate color sequence. Due to the complexity of the proofing process, it takes a lot of time and manpower, which not only affects the publishing speed, but also can not obtain satisfactory results. In particular, modern packaging printing requires the use of a variety of spot colors and high quality requirements, using traditional The mechanical proofing seemed to be stretched.
After decades of professional research, DuPont has always maintained a leading position in the fields of color matching, ink and pigments, and the Cromarin proofing system is a model of its success. Since DuPont introduced the first toner proofing system at the DRUPA exhibition in Germany in 1972, Cromartin simulation proofing has been widely accepted in the industry and has become a recognized proofing standard. Although the digital proofing system has many advantages, Shiroolin's method of simulating printing and proofing still has an irreplaceable effect. If special colors such as PANTONE spot colors, fluorescent colors and metallic colors are required, only the glycines proofing can accurately reproduce the color gamut of CMYK and beyond. This is a very effective proofing method for packaging printing.
I. Controlling Standard of Cromarin Proofing Machine The Cromarin simulation proofing machine adopts the European flat intaglio standard proofing control strip, which was developed by Brunel (FCLIX BRUNER) in 1979. DuPont cooperated with Bruner to place control strips on the edge of the proofs as a measurement standard. Thanks to the European standard, through the cooperation with other creative plate-making and output departments, it is possible to complete proofing conforming to the ISO prepress quality standards and ensure that the proofing is repeatable.
Second, the practical type of material used in Cromartin proofing machine All the materials of the proofing machine are colored powder, colored foil, photosensitive film, and printing materials.
1. The color pink powder is the dry ink, in addition to the four basic color powders of CMYK, various PANTONE spot colors, metal colors (gold, silver, etc.) and European Offset Printing Ink Standard (EOP), North American rotary printing machine Ink Standard (SWOP) toner.
2. The color standard of the color foil is the same as the color powder. DuPont applies a special method to apply the toner on the film to form a color foil. It has four basic colors of CMYK.
3, photosensitive film The photosensitive film consists of a protective layer, photosensitive layer, the base layer of three parts, its role is like PS version of the pre-coated photosensitive layer. When the photosensitive film is exposed to ultraviolet rays, the photosensitive portion is hardened, and the unsensitized portion still maintains its original properties. The directly affiliated toner or color foil is firmly bonded on the substrate, constituting a graphic portion of the proof sample.
4. Printing materials The printing materials mentioned here refers to all substrates including paper. Because DuPont Croliming has a wide range of proofing, not only can it be proofed on paper, but it can also be proofed on plastic, metal and other flat surfaces.
Third, practical Kemaringlin proofing equipment Practical Kemarining proofing equipment mainly includes laminating machine, exposure machine, color foil proofer, toner powder coloring station.
1. The main function of the laminating machine is to coat a layer of photosensitive film on the substrate, and there are semi-automatic and automatic operation modes. Laminating machine automatic film temperature is generally controlled at about 100 degrees Celsius, can also be adjusted according to the different requirements of the substrate.
2. Exposure machine The main part of the exposure machine is DuPont dedicated lamp, KOKOMO filter, built-in light control device and vacuum control device, which can completely guarantee the exposure quality.
3. The main function of the color foil proofer color foil proofer is to transfer the dry ink on the surface of the color foil to the surface of the substrate to form proofing graphics.
4. Toner Palette Toner The Toner Palette is equipped with an automatic vacuum cleaner to remove excess toner. When it is necessary to use a special color or metallic color for proofing, you can perform toner blending at the toner palette.
The quality control of the sample is completed by the dedicated test color separation film, which can perform gray balance, overprint, and exposure control.
Fourth, the operation process using DuPont Cromax simulation proofing system for proofing, the operation process is:
1, the photosensitive film and the substrate compound together, while separated from the protective layer.
2. Expose the separation film and the substrate coated with the film.
3. After the exposure is completed, take off the color separation film and tear off the base film of the photosensitive film.
4, color powder or color foil.
The above process only completed monochromatic proofing, and the above process can be repeated to produce multicolor effects. The entire proofing process (four colors, for example) takes only 15 minutes. It is fast, accurate, and easy to operate. Any employee can operate correctly after a short training period without the need for specialized technical personnel. The proofer complete set of equipment takes up less space and saves space. All the process of proofing does not come in contact with any chemicals and is conducive to environmental protection.
V. FAILURE ANALYSIS The main causes of failures in Cromartin's simulation proofing are:
1, exposure light source does not match In general, underexposure or over-consumption will cause poor color reproduction or dot network is not complete, the following is the DuPont exposure machine (Abbr.) and ordinary PS version of the printing machine (PS version) light source UV wavelength Compare:
DuPont: 365-380NM
PS version: 380-400NM
DuPont uses a light source of 360-380 NM from KOKOMO. Ultraviolet radiation generated by the exposure machine of DuPont Cromax's simulation proofing system ensures stable sample quality.
2. Insufficient evacuation of the exposure machine When the evacuation is insufficient, the high-light part will be lost, but the test strip may still display normally. Therefore, the test strip cannot be used to evaluate the degree of vacuum.
3, humidity, temperature is not suitable Cromax simulation proofing system has lower requirements on the environment, the general requirements of humidity is 50 positive and negative 10%, the temperature is 21 plus or minus 3 degrees Celsius.
4, film lamination pressure laminating machine two rollers are not parallel, the pressure is not uniform, will cause uneven film, thus affecting the exposure and color transfer.
5. Overprinting is not allowed to solve overprinting problems with the aid of magnifying glass and punching machine.
VI. Conclusions There are two main ways of proofing from the source of proofing images: First, proofing with positive images; second, digital proofing. Because the beginning of the digital proofing network and the fidelity of the proofs are different from those of traditional printing, it is not enough for many printing professionals to use it as a true proof. Therefore, the use of screening plus negatives proofing is still widely used. The proofing principle is consistent with the printing, and the printing quality can be matched with the quality of the sample. This is exactly what the DuPont Cromax simulation proofing system can provide.
The traditional proofing operation is to first dry the finished film onto the printing plate, and then mount the printing plate on the proofing machine and perform overprinting according to the appropriate color sequence. Due to the complexity of the proofing process, it takes a lot of time and manpower, which not only affects the publishing speed, but also can not obtain satisfactory results. In particular, modern packaging printing requires the use of a variety of spot colors and high quality requirements, using traditional The mechanical proofing seemed to be stretched.
After decades of professional research, DuPont has always maintained a leading position in the fields of color matching, ink and pigments, and the Cromarin proofing system is a model of its success. Since DuPont introduced the first toner proofing system at the DRUPA exhibition in Germany in 1972, Cromartin simulation proofing has been widely accepted in the industry and has become a recognized proofing standard. Although the digital proofing system has many advantages, Shiroolin's method of simulating printing and proofing still has an irreplaceable effect. If special colors such as PANTONE spot colors, fluorescent colors and metallic colors are required, only the glycines proofing can accurately reproduce the color gamut of CMYK and beyond. This is a very effective proofing method for packaging printing.
I. Controlling Standard of Cromarin Proofing Machine The Cromarin simulation proofing machine adopts the European flat intaglio standard proofing control strip, which was developed by Brunel (FCLIX BRUNER) in 1979. DuPont cooperated with Bruner to place control strips on the edge of the proofs as a measurement standard. Thanks to the European standard, through the cooperation with other creative plate-making and output departments, it is possible to complete proofing conforming to the ISO prepress quality standards and ensure that the proofing is repeatable.
Second, the practical type of material used in Cromartin proofing machine All the materials of the proofing machine are colored powder, colored foil, photosensitive film, and printing materials.
1. The color pink powder is the dry ink, in addition to the four basic color powders of CMYK, various PANTONE spot colors, metal colors (gold, silver, etc.) and European Offset Printing Ink Standard (EOP), North American rotary printing machine Ink Standard (SWOP) toner.
2. The color standard of the color foil is the same as the color powder. DuPont applies a special method to apply the toner on the film to form a color foil. It has four basic colors of CMYK.
3, photosensitive film The photosensitive film consists of a protective layer, photosensitive layer, the base layer of three parts, its role is like PS version of the pre-coated photosensitive layer. When the photosensitive film is exposed to ultraviolet rays, the photosensitive portion is hardened, and the unsensitized portion still maintains its original properties. The directly affiliated toner or color foil is firmly bonded on the substrate, constituting a graphic portion of the proof sample.
4. Printing materials The printing materials mentioned here refers to all substrates including paper. Because DuPont Croliming has a wide range of proofing, not only can it be proofed on paper, but it can also be proofed on plastic, metal and other flat surfaces.
Third, practical Kemaringlin proofing equipment Practical Kemarining proofing equipment mainly includes laminating machine, exposure machine, color foil proofer, toner powder coloring station.
1. The main function of the laminating machine is to coat a layer of photosensitive film on the substrate, and there are semi-automatic and automatic operation modes. Laminating machine automatic film temperature is generally controlled at about 100 degrees Celsius, can also be adjusted according to the different requirements of the substrate.
2. Exposure machine The main part of the exposure machine is DuPont dedicated lamp, KOKOMO filter, built-in light control device and vacuum control device, which can completely guarantee the exposure quality.
3. The main function of the color foil proofer color foil proofer is to transfer the dry ink on the surface of the color foil to the surface of the substrate to form proofing graphics.
4. Toner Palette Toner The Toner Palette is equipped with an automatic vacuum cleaner to remove excess toner. When it is necessary to use a special color or metallic color for proofing, you can perform toner blending at the toner palette.
The quality control of the sample is completed by the dedicated test color separation film, which can perform gray balance, overprint, and exposure control.
Fourth, the operation process using DuPont Cromax simulation proofing system for proofing, the operation process is:
1, the photosensitive film and the substrate compound together, while separated from the protective layer.
2. Expose the separation film and the substrate coated with the film.
3. After the exposure is completed, take off the color separation film and tear off the base film of the photosensitive film.
4, color powder or color foil.
The above process only completed monochromatic proofing, and the above process can be repeated to produce multicolor effects. The entire proofing process (four colors, for example) takes only 15 minutes. It is fast, accurate, and easy to operate. Any employee can operate correctly after a short training period without the need for specialized technical personnel. The proofer complete set of equipment takes up less space and saves space. All the process of proofing does not come in contact with any chemicals and is conducive to environmental protection.
V. FAILURE ANALYSIS The main causes of failures in Cromartin's simulation proofing are:
1, exposure light source does not match In general, underexposure or over-consumption will cause poor color reproduction or dot network is not complete, the following is the DuPont exposure machine (Abbr.) and ordinary PS version of the printing machine (PS version) light source UV wavelength Compare:
DuPont: 365-380NM
PS version: 380-400NM
DuPont uses a light source of 360-380 NM from KOKOMO. Ultraviolet radiation generated by the exposure machine of DuPont Cromax's simulation proofing system ensures stable sample quality.
2. Insufficient evacuation of the exposure machine When the evacuation is insufficient, the high-light part will be lost, but the test strip may still display normally. Therefore, the test strip cannot be used to evaluate the degree of vacuum.
3, humidity, temperature is not suitable Cromax simulation proofing system has lower requirements on the environment, the general requirements of humidity is 50 positive and negative 10%, the temperature is 21 plus or minus 3 degrees Celsius.
4, film lamination pressure laminating machine two rollers are not parallel, the pressure is not uniform, will cause uneven film, thus affecting the exposure and color transfer.
5. Overprinting is not allowed to solve overprinting problems with the aid of magnifying glass and punching machine.
VI. Conclusions There are two main ways of proofing from the source of proofing images: First, proofing with positive images; second, digital proofing. Because the beginning of the digital proofing network and the fidelity of the proofs are different from those of traditional printing, it is not enough for many printing professionals to use it as a true proof. Therefore, the use of screening plus negatives proofing is still widely used. The proofing principle is consistent with the printing, and the printing quality can be matched with the quality of the sample. This is exactly what the DuPont Cromax simulation proofing system can provide.
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