The success of a printing factory often depends on its speed and flexibility. Due to the difference in products and service targets, the number of prints is decreasing and the number of job types is increasing. The medium format printing press relies on the advantages of cost and price, and it must be able to set quickly and obtain stable production conditions. Automated print preparation, easy-to-control transfer, are the main features of medium-format presses.
Medium format printer refers to a printer with a paper width of 66-75 cm. In Europe, it is mainly 74, and in Japan it is mainly 66, 72, and 75.
1. Heidelberg 74 series
74 series have SMCD74, SM74, PM74, respectively, high-end and mid-range medium-format models.
The Speedmagter CD74 can be used in a wide range of paper, paperboard and plastic sheets. It is rugged and durable. It can run at maximum speed for a long period of time. It is suitable for companies that need to produce industrial packaging for years. Digital Prinect CP2000 Press Control Center supports the rapid replacement of paper format and printing materials.
Speedmaster CD74 has two formats: C format 53cmX74cm and F format 60.5cmX74cm, configurable paper turnover device. This series of models is very flexible. Its features include:
• Automatically advances the feeders according to the change of the paper format and printed materials, shortening the time required for printing.
·Ink Ink Sets can respond quickly with ColorFastSolution software.
Alcolor continuous film-forming dampening device can achieve a stable ink-water balance.
· The AirTransfer transfer device with Venturi's patented technology ensures optimum paper transfer between printing units.
· The developed cleaning device fully meets the environmental protection requirements.
Heidelberg InkLine direct inking system automatically fills the ink fountain and monitors the amount of ink in the ink fountain.
· PrinectAutoRegister can be fully automated on-board register control to reduce the printing time.
·It can remotely control the axial, circumferential and lateral register of coating machine, save time and reduce waste at startup.
· The DryStar drying system using infrared, hot air and cold air modules can optimize the paper feeding.
· The presetting of the delivery mechanism ensures that the delivery is neat. The paper brake function adjusts the brake remotely.
·Automatically adjustable paper rollover device.
At present, there are many kinds and types of densitometers manufactured abroad. In general, the first letter of the densimeter model represents the first letter of the English word for the nature and characteristics of the densitometer. For example: T stands for transmission and R stands for reflection. (M) stands for densitometer, O stands for dot area tester, TR stands for transmission and reflection, OT stands for dot area transmission densitometer, TD stands for transmission densitometer, and RD stands for reflection densitometer. The Arabic numbers following the densitometer model are the serial numbers of the densitometer.
There are two types of domestically-made models: CMF, which represents color reflectance densitometers, and CMT, which represents transmission densitometers.
1. Reflection Densitometer Measurement
A calibrated densitometer must be used to measure the reflection density. All reflection density values, dot gain/TVI in SNAP are based on devices in the ISOT state and they conform to ANSI/ISO 5/3 and 5/4 standards. When printing on newsprint or other rough paper, SNAP recommends a 4mm aperture.
In all cases, the size of the aperture should be determined in conjunction with the measurement. All measuring instruments are non-polarized. The density side is absolute, including the paper density. The calculation of dot gain/TVI values ​​should comply with ANSI/CGATS.4 (based on the Murray-Davies equation). Overprinting rate measurements should also conform to ANSI/CGATS.4 (based on the Preucil overprint equation).
2. Measurement of transmission densitometer
In the transmission densitometer measurement, although light and positive panchromatic light values ​​are to be displayed, the transmission densitometer measurement is based on the latter. The percent dot area is corrected using the UGRA scale, which uses 0.5% of the light-colored area as the zero-reference color patch (film-based fog). The recommended aperture size is 3mm. In any case, the size of the aperture should be determined in conjunction with the actual measurement.
The composition of a standard density meter
Densitometers have 3 basic components (of course there are proofs to be measured). These three components include:
1. Lighting system
It consists of lighting fixtures, lighting circuits, and power supplies for lighting. The light emitted by the luminaire is converted to comply with ANSI/ISO standards, providing light of a certain color quality (for example, to balance red light, green light, and blue light), referred to as light source A. This color quality is very close to the quality of the light emitted from a tungsten lamp that has never been added to the filter. (The densitometer's bulb is made of a material that is capable of controlling the brightness or providing the luminaire with pulses so that each flash of light is of a quality Can be powered by a consistent circuit. However, regardless of the light and power supply, the lamp and power supply must be guaranteed as known illumination of the incident light portion of this ratio.
2. Collecting light and measuring system
This system consists of a photoreceptor, an optical path that collects light, and a spectroscopic filter that passes only part of the visible spectrum of light to the light receiver and blocks light from other parts. This system of collecting light usually includes a color filter that matches the entire spectral sensitivity with some of the mentioned standards. The previously used color filter sets for printing and publishing densitometers correspond approximately to the color separation characteristics in the printing process. These spectral values ​​were redefined by the ANSI IT2 committee and produced a documented standard called the T-state. This engineering specification can match densitometers produced by the same manufacturer, and can also match densitometers produced by different densitometer manufacturers. The density specification of the state T is the result of designing, calibrating, and calibrating in accordance with the criteria response definition.
3. Signal processing system
The signal processing system obtains electronic signals representing incident light and received light energy for calculation and display. This system may be a simple ratio detector, which can be connected to logarithmic calculation circuits for analog or digital displays. It may also include memory functions to handle functions such as dot gain and contrast.
Is it necessary to eliminate the density of paper when measuring with a densitometer? Now that the paper is set to zero does not mean that the user does not have to subtract the density of the paper from the readings. We need to subtract the density of the paper from the density in the field and the density of the screening tone. For better communication purposes, this practice must be followed.
Another print attribute that is meaningful for subtracting paper density is the density of a quarter tone. The density of the quarter tones minus the density of the paper (the relative density of the quarter-tone areas) better explains the effect of the printing ink, or the hue itself, because the side volume yields much of the density from the paper. However, if the lateral volume is absolute and the paper density is included, the solid ink density measurement and important printing attributes (such as print contrast, color cast, and gray balance) are better related to the perception of the printed image by the human eye. In a nutshell, if the purpose of using a densitometer is to provide objective measurements that correlate well with what the press operator actually sees, the measurement should be absolute, including the density of the paper. The use of a three-color filter with modern densitometers to measure paper is also very useful in assessing and monitoring the quality of unprinted papers (such as relative color and brightness). After having equipped density meters to master the standardized data of the printing process, We can conduct comprehensive and data management quality control on the plate making process and printing process.
Medium format printer refers to a printer with a paper width of 66-75 cm. In Europe, it is mainly 74, and in Japan it is mainly 66, 72, and 75.
1. Heidelberg 74 series
74 series have SMCD74, SM74, PM74, respectively, high-end and mid-range medium-format models.
The Speedmagter CD74 can be used in a wide range of paper, paperboard and plastic sheets. It is rugged and durable. It can run at maximum speed for a long period of time. It is suitable for companies that need to produce industrial packaging for years. Digital Prinect CP2000 Press Control Center supports the rapid replacement of paper format and printing materials.
Speedmaster CD74 has two formats: C format 53cmX74cm and F format 60.5cmX74cm, configurable paper turnover device. This series of models is very flexible. Its features include:
• Automatically advances the feeders according to the change of the paper format and printed materials, shortening the time required for printing.
·Ink Ink Sets can respond quickly with ColorFastSolution software.
Alcolor continuous film-forming dampening device can achieve a stable ink-water balance.
· The AirTransfer transfer device with Venturi's patented technology ensures optimum paper transfer between printing units.
· The developed cleaning device fully meets the environmental protection requirements.
Heidelberg InkLine direct inking system automatically fills the ink fountain and monitors the amount of ink in the ink fountain.
· PrinectAutoRegister can be fully automated on-board register control to reduce the printing time.
·It can remotely control the axial, circumferential and lateral register of coating machine, save time and reduce waste at startup.
· The DryStar drying system using infrared, hot air and cold air modules can optimize the paper feeding.
· The presetting of the delivery mechanism ensures that the delivery is neat. The paper brake function adjusts the brake remotely.
·Automatically adjustable paper rollover device.
At present, there are many kinds and types of densitometers manufactured abroad. In general, the first letter of the densimeter model represents the first letter of the English word for the nature and characteristics of the densitometer. For example: T stands for transmission and R stands for reflection. (M) stands for densitometer, O stands for dot area tester, TR stands for transmission and reflection, OT stands for dot area transmission densitometer, TD stands for transmission densitometer, and RD stands for reflection densitometer. The Arabic numbers following the densitometer model are the serial numbers of the densitometer.
There are two types of domestically-made models: CMF, which represents color reflectance densitometers, and CMT, which represents transmission densitometers.
1. Reflection Densitometer Measurement
A calibrated densitometer must be used to measure the reflection density. All reflection density values, dot gain/TVI in SNAP are based on devices in the ISOT state and they conform to ANSI/ISO 5/3 and 5/4 standards. When printing on newsprint or other rough paper, SNAP recommends a 4mm aperture.
In all cases, the size of the aperture should be determined in conjunction with the measurement. All measuring instruments are non-polarized. The density side is absolute, including the paper density. The calculation of dot gain/TVI values ​​should comply with ANSI/CGATS.4 (based on the Murray-Davies equation). Overprinting rate measurements should also conform to ANSI/CGATS.4 (based on the Preucil overprint equation).
2. Measurement of transmission densitometer
In the transmission densitometer measurement, although light and positive panchromatic light values ​​are to be displayed, the transmission densitometer measurement is based on the latter. The percent dot area is corrected using the UGRA scale, which uses 0.5% of the light-colored area as the zero-reference color patch (film-based fog). The recommended aperture size is 3mm. In any case, the size of the aperture should be determined in conjunction with the actual measurement.
The composition of a standard density meter
Densitometers have 3 basic components (of course there are proofs to be measured). These three components include:
1. Lighting system
It consists of lighting fixtures, lighting circuits, and power supplies for lighting. The light emitted by the luminaire is converted to comply with ANSI/ISO standards, providing light of a certain color quality (for example, to balance red light, green light, and blue light), referred to as light source A. This color quality is very close to the quality of the light emitted from a tungsten lamp that has never been added to the filter. (The densitometer's bulb is made of a material that is capable of controlling the brightness or providing the luminaire with pulses so that each flash of light is of a quality Can be powered by a consistent circuit. However, regardless of the light and power supply, the lamp and power supply must be guaranteed as known illumination of the incident light portion of this ratio.
2. Collecting light and measuring system
This system consists of a photoreceptor, an optical path that collects light, and a spectroscopic filter that passes only part of the visible spectrum of light to the light receiver and blocks light from other parts. This system of collecting light usually includes a color filter that matches the entire spectral sensitivity with some of the mentioned standards. The previously used color filter sets for printing and publishing densitometers correspond approximately to the color separation characteristics in the printing process. These spectral values ​​were redefined by the ANSI IT2 committee and produced a documented standard called the T-state. This engineering specification can match densitometers produced by the same manufacturer, and can also match densitometers produced by different densitometer manufacturers. The density specification of the state T is the result of designing, calibrating, and calibrating in accordance with the criteria response definition.
3. Signal processing system
The signal processing system obtains electronic signals representing incident light and received light energy for calculation and display. This system may be a simple ratio detector, which can be connected to logarithmic calculation circuits for analog or digital displays. It may also include memory functions to handle functions such as dot gain and contrast.
Is it necessary to eliminate the density of paper when measuring with a densitometer? Now that the paper is set to zero does not mean that the user does not have to subtract the density of the paper from the readings. We need to subtract the density of the paper from the density in the field and the density of the screening tone. For better communication purposes, this practice must be followed.
Another print attribute that is meaningful for subtracting paper density is the density of a quarter tone. The density of the quarter tones minus the density of the paper (the relative density of the quarter-tone areas) better explains the effect of the printing ink, or the hue itself, because the side volume yields much of the density from the paper. However, if the lateral volume is absolute and the paper density is included, the solid ink density measurement and important printing attributes (such as print contrast, color cast, and gray balance) are better related to the perception of the printed image by the human eye. In a nutshell, if the purpose of using a densitometer is to provide objective measurements that correlate well with what the press operator actually sees, the measurement should be absolute, including the density of the paper. The use of a three-color filter with modern densitometers to measure paper is also very useful in assessing and monitoring the quality of unprinted papers (such as relative color and brightness). After having equipped density meters to master the standardized data of the printing process, We can conduct comprehensive and data management quality control on the plate making process and printing process.
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