According to screen and printing table form classification
According to the screen and the form of the printing table, the screen printing machine can be divided into the following two types.
(1) Flat screen machine
Flat screen refers to screen plate for flat screen printing machine.Flat screen printing can only be reciprocating intermittent type, or screen fixed, scraper back and forth.Or scraper fixed, screen version back and forth.In this way, ink supply and scraping can not be continuous.Increase the rise and fall, back and forth movement of time, limit the printing speed.The maximum printing capacity of the machine is about 3000 prints /h.
Flat screen machine is currently the most widely used variety.Many manufacturers engaged in screen printing mechanism has begun to produce a variety of specifications according to the industry and use of screen printing machine.For example, printed circuit board and electronic components screen printing machine for electronic industry, screen printing machine for porcelain flower paper printing, three-dimensional goods screen printing machine for industrial use, curved screen printing machine, printing and dyeing screen printing machine, etc.
I. Flat screen platform open book type flat screen printing machine
This kind of screen printing machine is a common type of plane screen printing machine.The edge of the flat screen printing plate, with hinge fixed on the machine, screen printing plate can swing around the fixed edge, so it is also known as the hinge type plane screen printing machine.When printing, put down the screen plate, parallel to the printing table, and then squeegees on the plate to do horizontal squeegees pressure movement, printing.After printing, lift the screen plate and take out the print.
This screen printing machine is available in two types: manual and semi-automatic.Manual type has simple structure, convenient maintenance, low price, wide adaptability, but low printing accuracy, high technical level requirements for operators, low printing efficiency, suitable for small batch of flat printing.
Type semi-automatic screen printing machine in addition to the calendar need to manually install and remove, other processes can be done by machinery, also known as a semi-automatic chap type flat network platform flat screen printing machine or fan jewels flat screen printing machine, flat screen platform this type semi-automatic screen printing machine, fast printing speed, scraper, printing pressure stroke as well as facilitate adjustment, good stability and printing quality is better than that of manual screen printing press.The printing platform is usually made of stainless steel and equipped with vacuum adsorption devices.It has small floor space and excellent operation performance.This kind of screen printing machine overcomes the disadvantage that the scraper can’t be improved when the general small screen printing machine returns the ink. It can be improved when the ink is returned without adding extra power, which effectively extends the service life of the screen printing plate and improves the printing quality.
2. Platform flat screen printing horizontal lifting plane screen printing machine
This screen printing machine is a flat screen printing plate horizontal opening of a brush machine.In the process of printing, screen printing plate horizontal state up and down the movement.
This kind of screen printing machine is a kind of flat screen printing machine. During the printing process, screen printing moves horizontally up and down.
This kind of screen printing machine, printing fixed, printing table do horizontal movement, scraper do horizontal movement, also known as sliding screen printing machine.
This kind of screen printing machine takes and puts the printing pieces when the printing platform slides out, so the positioning, taking and putting of the printing pieces is more convenient.It can be used for printed circuit board, electronic components and other planar monochrome and color printing.
4. Horizontal sliding screen printing machine with inclined printing table
This machine is one kind of screen printing machine that the printing table can syncline up (down) square horizontal rise (down).
5. Fan-shaped open and closed screen printing machine
The printing table of this machine USES the inner end as the fulcrum, which can do the upper and lower fan opening and closing movement, but the space is narrow, so it is inconvenient to exchange and accept things.
6. Rotary screen printing machine with printing table
This screen printing machine has several plates on the rotary table, which can be rotated and continuously printed.The characteristic of this type is that it can control the accuracy of printing position. Because the material supply and output of this type can be synchronized during printing, the printing efficiency is high.
7. Roller screen printing machine
Drum screen printing machine is a special machine for high speed printing of sheet-fed substrate.
This machine is automatic for paper feeding, paper collecting, drying transfer and stacking.Many countries in the world have developed cylindrical screen printing machines, the main purpose of which is to carry out large-scale paper advertising printing.The principle and structure of this screen printing machine is characterized by the cylinder-shaped printing table.Flat plates and circular plates are properly meshed by rack and pinion.Scraper fixed in the drum above the center, printing plate horizontal movement, drum rotation at the same time.The substrate is sent to a preparatory position before printing and then rotated with the roller.There are numerous vacuum holes on the circular surface of the drum, and the adsorption substrate is used for rotary printing.But there are limits to the thickness of the substrate, small roll can only print thin substrate.Thicker substrate printing solution is to increase the diameter of the drum, but the diameter is too large, will increase the weight of the drum, the cylinder motion inertia increases, to accurately control the substrate, to ensure accuracy, there are some difficulties, even if the above method can solve the accuracy problem, the speed will slow down.To solve the problem of speed, a new type of roller screen printing machine was developed.This machine is characterized by the large diameter of the drum into a “fan”, so although the diameter is large, but the weight is very light, can be high-speed printing (up to 4600 printing /h), in addition because of the large arc, can be a wide range of substrate printing.
(2) Circular mesh machine
Circular screen refers to a screen printing machine with a circular plate (Figure 3-19).The two ends of the cylinder network are reinforced end ring and support spokes, which are supported by the spokes through the central axis.One end of the shaft is fitted with a driving gear for wheel turning.The simplified parts between the rings are wire mesh or metal templates.Inside the circular Jane there is an inking pipe with a nozzle and an empty sleeve on the shaft of the scraper.When working, the circular plate does continuous rotation motion, the ink knife does not move.The uniformity, cleanliness and viscosity stability of the ink in the circular screen machine are excellent.Printing speed up to 6000 printing /h (80m/min), mainly used for multi-color printing of drum piece cloth and wallpaper.
1. Circular screen flat screen printing machine
In the round screen printing machine, the more mature product is the round screen platform plane screen printing machine, the most prominent feature of this type is that the screen plate is made of metal wire cylindrical, no joint, ink (used in printing and dyeing industry color paste) by a special pump from the center of the screen
The pipe is injected into the mesh. The mesh is equipped with an axial ink scraper, which is perpendicular to a bus on the inner surface of the simplified, and each mesh is printed with one color.
Circular screen flat screen printing machine is widely used in the printing and dyeing industry, suitable for printing into rolls of textiles such as silk, cloth, bed sheets, handkerchiefs and so on.The front part of the machine has uncoiling device, the rear part has drying device and winding device, and the middle part also has tension control and overprinter device.
The printing principle of circular screen printing machine on circular screen platform for general web substrate (such as self-adhesive trademark printing), the scraper is also installed in the circular screen printing plate, the printing table is flat.During printing, the printing platform is fixed, the circular screen plate rotates, and the vertical downward scraping plate is in line contact with the inner surface of the circular screen. The ink is extruded through the inked part of the circular screen plate, and the ink is lost to the substrate as a horizontal movement.
2. Rotary screen printing machine with cylindrical surface
The pad of this type is a circular plate supported by a hollow shaft.There is an air chamber inside the chamber, which is connected to the vacuum pump by air valve and pipeline through a hollow shaft.There are many suction holes on the surface of the roller, and the air chamber can determine the range of its adsorption substrate (about 1/4 of the circle).The roller printing line also has paper teeth for clamping and longitudinal positioning rules.When printing, the ink knife remains stationary, and the substrate adsorbed on the drum and screen keep the same speed synchronous motion.
After printing, printing and screen plate quickly.The rolling plate is faster than the platform because of feeding and off the screen.The rolling simple printing press by the simple movement can be divided into two types of stop and round – trip.The former for one-way operation, fast printing speed;The latter is round-trip operation and slow.The disadvantage of rolling simple printing machine is that it cannot print hard materials, such as cardboard and hard plastic.It is mainly used for printing transfer paper and self-adhesive label paper.