Commercial web offset presses are a type of web offset press that is a web multicolor offset press capable of printing 175 lines/inch or more of color fine prints. Commercial web offset presses are mainly used for printing color magazines, high-end commercials, high-end promotional materials, pictorials, etc. Due to the increasing volume of high-end magazines and newspapers, the use of sheetfed offset presses has been unable to meet the growing market demand.
Due to the expansion of the market, all famous printing equipment manufacturers have developed their own high-end commercial web offset presses, and have adopted a large number of advanced technologies. For example, Heidelberg's M-600, Manroland's POLYMAN, ROTOMAN, KBA's Compacta818, 215 and other models. The following is an introduction to some of the advanced technologies used in commercial web offset presses, and a rough analysis of the commercial rotary press market.
The latest technology:
No shaft drive technology
The shaftless transmission is an advanced technology. At present, there are two main forms: one is that a printing color group is driven by a servo motor, that is, the transmission shaft is eliminated; the other is that the entire printing unit has no transmission gear and a transmission shaft. Plate cylinders, blanket cylinders, impression cylinders, and inking rollers are all driven by separate motors. The most widely used one is still the first form. Regardless of the form, in order to ensure the accuracy of overprinting, the synchronous performance of each motor is required to be high. It is said that it has reached an accuracy of 130,000th, and only a difference of ±0.01mm in the length of 1.3m.
The advantages of shaftless transmission are mainly manifested in the following aspects: Firstly, the gear transmission is completely eliminated, the oil lubrication is eliminated, and the machine noise is reduced; secondly, the auxiliary time can be reduced. When one unit is printing, another unit can The machine is equipped with a high degree of automation, and the unit combination is simpler and more flexible. The application of shaftless transmission technology makes the machine control of the transmission part highly automated, and the operation is also more convenient and flexible. Each printing cylinder can be operated independently, and it is convenient to assemble and disassemble and clean the blanket and the printing plate. However, the simplification of this mechanical mechanism is replaced by a complicated electrical system, which has a relatively low price relative to the mechanical, stable performance and convenient maintenance.
As far as the actual situation in China is concerned, the mechanical cost is not high, and the electrical price is not low. In comparison, the reliability of the machine and the reliability of the maintenance machine and the convenience of maintenance are more easily accepted by the user, so the current Printing with shaft drives is not a conservative option. However, the market share of shaftless transmission will become larger and larger. From the perspective of development trend, shaftless transmission will replace shaft transmission. At present, the famous shaftless transmission technology providers mainly include: the shaftless drive system of Rexroth Indramat and the shaftless drive system of Lunci. Commercial rotary offset presses that use shaftless drives are mainly models of KBA's Compacta215 and Manroland's POLYMAN.
Double Needle Bar Warp Knitting Machine
The double needle bar Warp Knitting Machine is a popular warp knitting machine that is widely used to produce mesh fabrics, seamless fabrics, flannel, blankets,etc. Double Needle Bar Machines includes RD5, RD6, RD7, RDJ5/1, RDJ6/2 types, the special textile structure contains upper and bottom surface and pile yarn between them. The continuous development of RD machines makes our products more stable and outstanding.
Technical Data:
Working Width/Gauge: 138", 200"/ E18,E22,E24;
Working Speed: 50-750rpm (Depends on yarn and designs);
Knock-over Comb Bar Distance: 1-12mm (Easily Adjustable swiveling device);
Bars/Knitting Elements: 2 needle bars with latch needle units (individual latch needle and latch needle blocks), 2 knock-over comb bars, and 2 moveable stitch comb bars.
Pattern Drive System: Pattern Discs Drive or EL Drive;
Yarn Let-off Device: Electronical Yarn Let-off System;
Fabric Take-up: Electronical Fabric Take-up System;
Batching Device: Electronical Batching Device;
Laser Stops Detector;
Online Service Supported.
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CHANGZHOU A-ZEN TEXTILE TECHNOLOGY CO.,LTD , https://www.barmachinery.com