Classical offset printing - one of the oldest and nevertheless the ways of the press most popular presently. The offset printing is one of types of flat printing. Often it call an indirect or indirect type of the press because paint from a printing form is transferred at first to the elastic intermediate carrier (the offset cylinder), representing a cloth from rubber and fabric, and then already to paper or other sealed material.
The offset printing, despite some decrease in circulations and active approach of the digital press, is presently the most popular and demanded type of the press. Produce by this method of the press the majority of printed materials: books and newspapers, booklets, brochures and catalogs, posters and calendars, cards, diplomas, diplomas, labels and packing, etc. Presently the offset printing thanks to the highest quality of reproduction of images, the fine color rendition, the most exact transfer of tones and half tones is the most popular way of production of advertizing and business (representative) polygraphy. The offset printing is profitable at big and average circulations, possesses high efficiency, is capable to reproduce firm colors of the company.
Offset printing house
Offset printing house as well as universal printing house, possess the offset equipment, capable to reproduce big circulations of printed materials. Feature of an offset printing is rather long time and big costs of prepress preparation, production of a form and a priladka. For this reason the offset printing is economic on big circulations. But there is also other production which should be printed in the offset way, despite not so big circulations. These are letterheads, firm business cards on which on the Pantone it is impossible catalog qualitatively to print corporate colors of the company by means of the digital press, some other firm production. In these cases, despite high cost, even at small circulations many clients prefer to order similar production in offset printing house. The advantage of an offset printing is opportunity to print on any paper of different density and the invoice, both CMYK paints (full-color) and pan-ton (firm colors). Are available, of course, and certain restrictions. For example, offset paints transparent also are brought with thin layers therefore to bring light paint on a dark background is rather problematic. For the press on unabsorbed surfaces it is necessary to use special technologies - the press folic paints or the UV printing. Offset cars happen both sheet, and rolled. Most often offset and universal printing houses are equipped with the sheet offset cars capable economically to print wide range of the most different printed materials. Rolled offset cars equipped, as a rule, the printing houses specializing on production of books and newspapers. This equipment very expensive, and the largest offset printing houses can allow it to themselves. The sheet offset printing is successfully applied to the widest range of printed materials - from small business cards to solid catalogs and books.
With emergence and active development of the digital press there was also a new technology - digital offset. Now the given technology is very popular as combines high offset quality and efficiency of the digital press, allows to print on different materials. Digital offset appeared recently, but already actively wins positions, taking away both part "offset", and part of "digital" orders. The equipment for digital offset possesses a constant printing form owing to what it is capable to make production of the highest quality. However, as well as in the usual digital press, the image directly from the file is transferred to the printing machine. Unlike the digital equipment using dry toners, in digital offset special liquid paint, in consisting of plastic and the loaded particles is used. Under the influence of pressure of cylinders and a potential difference, paint is transferred at first to the offset cylinder, and then to paper. Important advantage of technology of digital offset is that that the raster point has more accurate edges thanks to what there is no rastiskivaniye problem. The technology of a digital offset printing new, is constantly improved and allows to provide the customer more and more opportunities.
The publishing and printing joint stock company "Sharq" offers you services in production of your printing products by way of an offset printing. At wide experience in polygraphy, we know all subtleties and nuances of all types of the press. Except the press of your production, we can develop design of polygraphy and execute full preparation of your product for printing. We as well offer services of postprinting processing and finishing of a product of any complexity.
Now offset print is the most popular technology of the polygraphy used for a quality printing of big circulations of printing products.
Technology of an offset printing
The offset printing is technology of the press, being that transfer of paint from a printing form on a sealed material is carried out by means of the intermediate offset cylinder.
The principle of action of an offset printing consists that the image is put in a naspetsialny way the processed plate, and then by means of the auxiliary offset cylinder - on the direct carrier. The full-color image consists of four primary colors: blue, yellow, purple and black. The subsequent drawing a varnish - varnishing is possible.
The offset printing (sometimes it call the classical press) at present is continues to remain the most widespread way of the press. Certainly, it is explained by its advantages.
Advantages of an offset printing
First of all, this very high quality of the press. The press provides in the offset way high quality on any kinds of paper and a cardboard, excellent reproduction of fine details, good transfer of flowers and half tones. At an offset way of the press paint by pressure is transferred from a flexible printing form to an elastic surface of a rubber cloth, and further - to any material intended for the press. The offset way of the press allows to print as in 1-2-3 paints tipovymicmyk-paints or Pantone, and to carry out the full-color four-colourful press. There is an opportunity to print and additional paints - "gold", "silver" and to use varnishes - offset, water and dispersive or UF-lak.chetyra of paint. By means of offset technology it is possible to print qualitatively books, newspapers, calendars, booklets, brochures, catalogs, notebooks and other printing products.
Other advantage of an offset printing is possibility of application of any types of paper: offset, newspaper, coated, a cardboard, design types of paper and even I blamed. Density of a material can fluctuate from 45 g/m to 250-300 g/m.
Advantages of an offset way of the press are:
- high quality;
- release of big circulations for the minimum time;
- possibility of use of various types of paper and wide range of postprinting processing;
- production reduction in cost at increase in circulation.
Shortcomings of an offset printing
Preparatory process is rather long. As a rule, it includes several processes: at first the dummy is mounted on the computer in electronic form, then removed in the form of photoforms, the following stage is the flare of photoforms and adjusting under the made form. As cost preparatory work belongs to all ordered circulation, that, naturally, the more will be circulation, the prime cost of a unit of production respectively there is less.
- unprofitability of the press of small circulations because of need of difficult prepress processing as prepress preparation increases cost;
- impossibility of personification and numbering of data.
If you need high-quality production of big circulations of printing products, the Publishing and printing joint stock company "Sharq" is always ready to provide the services.
The offset printing is one of ways of flat printing. This way of the press is dominating in the modern printing market.
In comparison with other ways of the press, the sheet offset printing has many advantages, important for customers of polygraphy. It is possible to carry to similar advantages:
- Possibility of the press of the widest range of quality printed materials.
- Rather low prime cost on a wide range of circulations of printed materials.
- The most ample color opportunities.
- Possibility of receiving grayscale images of almost photographic quality.
- The widest range of sealed materials.
- Ample opportunities of a choice of a format of a printing product.
Process of a sheet offset printing begins with that the building berth of sheet paper is loaded in samonaklad and thanks to the special mechanism of lifting of a building slip table moves to level at which the top leaf can be taken and be transferred to a laid on table, from where it is taken away by a forgreyfer. Forgreyfer is necessary to disperse a leaf to the speed of rotation of cylinders of printing section and to transfer a leaf to captures of the transferring cylinder. Through system of captures further transfer of a leaf from cylinders is carried out.
Each section of the car for a sheet offset printing incorporates printing, offset and formny cylinders. On the formny cylinder the printing form on which paint and moisturizing solution are brought is located.
By means of captures of the last printing cylinder, the sealed leaf is transferred to captures of the carriage of the chain conveyor and brought to an intake where the printed page at last is exempted from captures and after a pritormazhivaniye falls by a building berth.
There is a large number of designs of printing machines in which after the last printing section additional devices are located: varnishing section, drying device, protivootmaryvayushchy device, etc. Some sheet offset cars have devices for installation of special numerators.
The offset printing, depending on circulation and purpose of printed materials, is carried out by means of sheet and role (rolled) printing machines. Offset printing machines happen not only sheet, but also rolled (role). In these cars the format of the press depends on a format of a roll of paper. Rolled cars stand very expensively, the large printing houses which are letting out multiproduction production can afford them only. Productivity of rolled offset cars is very great, however that the equipment costs very expensively, economically effective these cars become at very big circulations.
The main difference of rolled offset cars from the sheet consists not only in a design colourful and printers, but also more elements which are responsible for process of transportation of sealed materials.
The paper cloth is carried out more effectively than the leaf, and rolled cars possess bigger productivity. Rolled cars are the production systems, capable to let out almost finished goods thanks to ease of embedding of devices of postprinting processing in them.
In the faltsevalny device the paper cloth is cut and exposed to folding process. Receiving already almost ready-made product (an example newspaper production can be) or an intermediate product is as a result possible.