Editor's note: Offset printing press is a vital component in the offset printing process. The stability of offset press mechanical performance, the level of automation in Chengdu, the production efficiency, and the operability of the machine have always been necessary parameters for the printing plant to purchase machines. This article will gather the five major offset press manufacturing brands of Heidelberg, Manroland, KBA, Komori, and Mitsubishi. They will make a comprehensive introduction to the mechanical structure, automation, and operation performance of their products. I believe this article will also become a printing Valuable information for machine lovers.
Heidelberg Technology Development
This article is provided by Heidelberg (China) Company
1. Mechanical structure of offset printing machine
The main premise for efficient production of sheet-fed multi-color offset presses is a stable and reliable paper feeder. Therefore, all major offset press manufacturers have incorporated them into their own production systems.
At present, according to different printing materials and specifications, the paper feeding method adopted by the sheet-fed offset printing machine-step belt type standard paper feeding has vacuum suction belt type paper feeding, which has its own advantages. The reason is that it has a stable structure, and the precise paper feed and guide gauge form a right angle. In addition to the platen roller, brush and flattener, it can be widely applied to a variety of printing materials, such as corrugated paper, slightly curled paper , Which is very important for paper with unstable printing specifications and performance.
Below medium format, such as four-fold and eight-fold offset presses, suction belt conveying is used because the operation and adjustment are simple and easy.
In order to adapt to the current status of short-run jobs, that is, frequent job conversion and paper size change, Heidelberg timely introduced the preset paper feeder with higher pursuit in reliability and speed. This system retains the structure and method of the traditional step belt, but has been optimized in many aspects to make the system more compact and easy for automatic operation and control. Its characteristic is that the paper forms a precise method structure with the front and side rules. In order to ensure the reliability and speed of paper feeding; secondly, the lifting of the paper stack is stepless rather than stepwise, so that the actual thickness of the paper can be increased to maintain a stable distance from the nozzle; third, it is adopted The semi-closed system has a positive effect on noise reduction, dust prevention and maintenance-free.
In addition, for the early and late arrival of the paper in the paper feeding process, Heidelberg adopts the hem gripper speed adjustment to automatically correct within the range of 200 ° to 312 ° rotation angle instead of the traditional fixed angle.
The cylinder layout and arrangement of the printing part is one of the hot topics in the industry today. In fact, in the face of diverse and specialized market demands, both the "seven" and "five" hours have irreplaceable characteristics.
The characteristic of "Seven" o'clock is that the paper of each color group is only handed over after printing, and it is advantageous for arranging large cylinders such as double-diameter impression cylinders, which is very suitable for thick paper printing (mainly packaging printing) that requires large curvature It is beneficial, but practice shows that this method is not perfect for the publication and commercial printing based on thin paper.
The "five" o'clock method is good for better arrangements for Mo Lu.
Heidelberg follows the natural needs of market segmentation, and adopts the "seven" dot arrangement for the SM102 and CD102. Among them, SM102 is a three-cylinder (A single-diameter, double-diameter and B single-diameter) transmission and turnover system, and the rubber cylinder, impression cylinder and A single-diameter paper transfer cylinder are almost "one" shape layout, which is very conducive to printing paper Transfer (even full-page printing is very good); CD102 uses double-diameter impression cylinder and triple-diameter paper transfer cylinder as the paper transfer system, its advantages are well known.
For SM102, Heidelberg also does not use an air cushion paper guide system, but uses a metal sleeve (so-called Micro Jaket device) with ultra-fine irregular chrome-plated bumps on the surface, which is installed on the impression cylinder after printing In order to prevent the dry surface from printing and smudging under the pressure.
Heidelberg also did not use the air cushion transmission method on the anti-rubbing and scratching device printed after turning over, but adopted the silicon metal anti-rubbing film, super blue cloth and steel sleeve on the storage paper cylinder. means.
In fact, one of the focuses of the dispute between the number of cylinders and the arrangement method is the effect of paper transfer misalignment caused by different paper transfer times on the printing quality.
Heidelberg's view is that the number of paper transfers has no substantial impact on print quality. The key is to consider the accuracy of the transfer structure itself. Practice has proved the correctness of this view.
Whether to go or not to roll pillow printing should be determined according to the specific structural characteristics of the cylinder, transmission gear, bearings, etc. Judging from the current manufacturing process level of the offset press, the roller pillow printing can ensure high-quality printing, low-noise operation and the best machine durability.
Heidelberg's inking and dampening system are also very characteristic. First, it has 21 ink rollers, adopting the front vertical type (the first two ink rollers are inking, and the rear two ink rollers are inking ink). The shortest ink path is only 8 ink rollers , Can achieve rapid ink flow response.
The dampening system is a five-roller structure and has an automatic speed compensation function. Its advantage is that it can quickly realize the balance of water and ink and maintain the stability of the water supply when the printing speed changes.
When printing small-format or large-area non-image area jobs, the demand for fountain solution is less than ordinary jobs, so the water supply of the bucket roller should be reduced accordingly. Heidelberg's approach is to partition the water bucket rollers relative to the (32) ink zones, and use a row of axially adjustable blowing fans to evaporate excess dampening fluid.
The paper collection part has an important influence on the production speed of the offset press and the quality of the printed products. Heidelberg has introduced an air-blowing paper guide device, which can lead the paper into the paper stack smoothly and without scratches, and the double powder spraying device not only makes the paper stack smooth and tidy, but also saves up to 30% of powder spraying.
Second, automation and integration
The level of automation of offset presses is one of the key points of competition among manufacturers. Its development goal is to free operators from the daily and complicated manual operations, so as to focus their energies on printing quality and efficiency. There is a means of winning competition in an environment where short-run jobs are soaring.
To further improve the automation level of offset presses is based on the continuous improvement and optimization of the mechanical performance and electronic control of the machine, so as to pre-adjust the specifications of the printing materials, realize automatic monitoring and control of printing quality, and configure fully digital Electronic display system, to achieve integrated operation and management, in order to achieve better quality, shorter preparation time and reduce maintenance time, and higher output.
Heidelberg has added features such as image color control and fully automatic on-line registration control in these areas and has won praise from the industry.
In order to avoid changes in printing colors and ensure stable printing quality, Heidelberg was the first to use spectroscopic measurement technology to scan images and synchronize online color adjustments.
The on-line automatic registration and registration system not only performs rapid fine-tuning registration at the beginning of printing, but also continuously monitors and corrects the entire printing process, which can greatly reduce machine downtime and paper waste.
Integration is the future development direction of the printing industry, because printing is transforming from a simple link to a complete production process (including pre-press and post-press), and digitalization is undoubtedly the leading factor that triggered this transition.
Digitalization and integration will optimize and automate changes in information such as efficient production planning, automatic machine presetting, and capture of effective production data. The result is a further reduction in job preparation time and production time, while at the same time reaching new heights in ensuring print quality and remote service.
Private label skincare face soap ,30 years experience guangzhou cosmetics factory supply ,OEM/ODM service is welcomed .
Guangzhou Athena Cosmetics Manufacturing Co.,Ltd is a subsidiary of YALAN international group which is located in Guangzhou,china.it is the production center of YALAN international group branding products,specialized in the development and production if cosmetics.ATHENA is qualified for import and export.
controls the quality in full accordance with GMP, ISO9001 quality system good manufacturing practice for cosmetics and key points of cosmetic production licence inspection.
face soap,whitening face soap,papaya face soap,acne face soap
Athena(Guangzhou) Cosmetics Manufacturer Co., Ltd , https://www.ydgzathenaskincare.com