Basic composition of printing equipment

Printing equipment is mainly composed of paper feeding device, printing device and paper receiving device. Four types of printing equipment are described in detail below. Paper feeding device is a device for installing, continuously supplying and replacing roll paper, which mainly includes roll paper supporting device, paper feeding device and paper receiving device (single sheet, reel).

A. Most roll paper support devices are supported by the center of the roll paper:

(1) Spindle of roller bracket

① Tapered mandrel.

② Expansion mandrel. (2) No mandrel support device. Mainly used in large printing presses.

(3) Mandrel support seat.

B paper feeding device, in the printing process, the diameter of the roll paper is gradually reduced until a new roll paper needs to be replaced.

(1) in the form of a paper arm. According to the number of roll paper that can be installed in the paper feeding device, it can be divided into three forms, namely, single arm type, double arm type and three arm type.

⑵ Pneumatic paper feeding mechanism. The pneumatic paper feeding mechanism takes compressed air as the power, and the pneumatic device drives the paper feeding arm to realize the lifting of the paper feeding arm.

⑶ Electric paper feeding mechanism. The mechanism consists of a motor and a mechanical transmission device.

C. When the web is used for letterpress printing for a long time, it is not only required to change the web without stopping, but also to paste the old and new paper tapes at the same speed to complete the whole process of changing the paper. Therefore, an automatic paper receiving device without stopping is usually set. The paper delivery system of web printing machine refers to the rewinding, folding and receiving system of printed paper tape, which mainly includes drying and cooling device, rewinding device and folding device (paper feeding, rewinding and online processing).

A. drying and cooling device.

1. drying device

(1) high-speed hot air drying device

Traditionally, air is electrically heated and then sent to printed matter by a fan. However, heat pump technology is widely used, which can achieve 60%-90% energy saving rate.

(2) Flame drying device

(3) Flame-hot air combined drying device

2. Cooling device. The surface temperature of the paper tape at the outlet of the drying device can often reach120 ~180 C, which requires cooling the paper tape surface. Therefore, there is no cooling device behind the drying device. The cooling device is generally composed of 2 ~ 3 hollow cooling rollers, which are connected with the cooling water circulation system.

B rewinding device: in the printing of soft packaging materials, it is often necessary to rewind the printed paper tape after multi-color printing, drying and cooling, which requires rewinding device.

C. Folding device is a device for cutting and folding printed paper tape on web printing machine. Technical management is to scientifically manage all technical activities in the production process in a planned and purposeful way according to the characteristics and laws of production technology itself and the current technical policies.

The basic tasks of technical management are: to establish the necessary working order for technical activities, establish and improve the technical management system, carry out scientific research, actively popularize and adopt new technologies, new processes and new materials, transform existing technical equipment, constantly tap potential, innovate and transform, and improve the modernization level of printing plants; Provide reliable technical basis for reasonable and efficient production organization, including product design, process plan and various technical documents; At the same time, it provides technical guarantee for safe production.

The main contents of technical management include: making plans for scientific and technological development, tapping potential, innovation and transformation of factories, and formulating and implementing relevant rules, regulations and responsibility systems for process management, quality management and equipment management. Collection and management of scientific research and technical information, management of technological innovation and introduction of new technologies and equipment, management of technical archives and technical data, and technical education, training and assessment of employees.

Technical management should be the responsibility of professional and technical personnel, special institutions should be set up, and modern scientific methods should be applied. Equipment management ensures that all kinds of equipment are in good condition at any time, improves equipment efficiency, and thus ensures the normal production.

The main tasks of equipment management are: according to the principle of advanced technology, economy and rationality, correctly purchasing equipment; Ensure that machinery and equipment are always in the best technical state; Master the repair and maintenance technology of imported equipment as soon as possible, do a good job in purchasing and supplying spare parts to ensure the normal operation of equipment; Formulate relevant equipment maintenance system and supervise its implementation; Establish equipment maintenance files, etc.

In addition, the rational use of equipment is also an important content in equipment management. Only by reasonable arrangement of production can we give full play to the role of equipment. It can not only obtain the best economic effect, but also reduce the wear and tear of equipment, prolong the service life of equipment and obtain long-term, stable and greater benefits.