Flat screen machine:
Screen for flat screen printing machine.The restrictions for reciprocating intermittent movement, the printing speed.Can be divided into: chap type, horizontal lift, mobile, inclined horizontal slip type printing, printing machine fan jewels, rotary printing, drum, etc.
Rotary screen machine:
Network version of cylindrical screen printing machine.Inside the cylinder, with the nozzle of the ink pipe and empty sets the scraping blade of the shaft.Working cylinder version as a continuous rotary motion, ink knife.Can be divided into garden network platform and rotary screen roller.
According to the substrates shape classification:
Flat screen printing machine:
Its substrates for planar shape, can be single, also can be a drum;Screen has a flat screen, also has a cylinder;Printing machine has a flat shape, also for the cylinder.
Curved surface screen printers:
Curved surface screen printing machine classification according to the degree of automation, a semi-automatic surface screen printing screen printing machine and automatic surface;According to the shape of the screen plate, a flat screen surface screen printing machine and cylinder surface screen printing press.
Special silk screen printing:
(1) magnetic roller (also called no scraper) silk screen printing: printing using magnetic iron roller instead of scraper.
(2) a T-shirt printing machine:
(3) electrostatic printing machine: characterized by screen don't have to be in contact with the substrates are printing can be performed.
Connected to the positive electrode on version made of stainless steel wire mesh, negative electrode lead with silk screen version of the relative parallel plate connected (against electricity plate).Don't show the powder of positive and negative charges, in is in close proximity to the stainless steel wire mesh, surface charge, their positive and negative charge on the concentration.With the positive electrode of stainless steel wire mesh accepted powder ink negative charge, make the ink powder are positively charged, affected by the screen and against electric field between the plates, from the network version of the image of the screen opening out and stopped by substrates, attached on the surface of substrates, then use the way such as heating or adding solvent fixation finish printing ink.
Silk screen printing machine working principle:
Flat screen flat screen printing machine working principle:
Scraping plate extrusion ink in motion and silk screen printing, silk screen printing plate and the substrates to form a stamping line, N1 and N2, because the screen has tension force F2 scraping board, for to make silk screen plate except the embossed line is not in contact with substrates, inks in scraping plate under the action of the extrusion of F1, through the mesh, moving from the embossed line printing on substrates, as shown in the figure below.In the process of printing, silk screen printing plate relative motion with scraping board, extrusion and back stretch F1 F2 with synchronous mobile screen under the back stretch, the rallies and substrates from contact, lest the print ceng dirty.Scraping board at the completion of a one-way from substrates with silk screen printing, after printing to return back to the ink at the same time, a printing cycle is completed.
Flat screen surface screen printing machine working principle:
In the cylindrical or conical surface with flat screen to screen printing, flat screen plate and substrates, but scraping board still.Flat screen plate by the flat screen surface screen printing press at a constant speed drive for translation, because the network version of the friction placed in the substrates of the supporting device rotates.In stamping at the surface of substrates linear velocity agree with flat screen plate movement speed, scraping the ink printing.Stamping line should be highest in curved substrates in a bus, for enlarging the off-grid, ensure the quality of printing.
The main mechanism of silk screen printing:
Transmission device, motor, electromagnetic clutch, reducer, speed regulating agencies.
Plate device: screen plate in the printing machine must be fixed on the plate device, in the printing process, realize the chap type ups and downs or horizontal movements.Mainly include: plate holder, plate lift, the adjusting mechanism, compensation mechanism.
Printing equipment: scraping and back is the main action, screen printing ink scraping system and back to the ink system, usually installed in scraper sliding shelves, in reciprocating motion, make the scraping plate and the ink plate alternately back ups and downs, respectively scraping and back to the action of ink.
The realization of the reciprocating stroke (1) printing, generally USES the following institutions: crank connecting rod mechanism, slider-crank mechanism, chain sprocket, cylindrical plug magnetic cylinder.
(2) oriented institutions generally USES the following format: roller slot rail and double guide shaft, guide shaft and slider.
(3) blow, back to the ink plate transposition institutions often use the following form:
Steps tank lifting collision block lever switch mechanism, the CAM lifting mechanism and leverage transposition, two reverse action cylinder or single cylinder lever mechanism, CAM - swinging rod mechanism pull wire lever mechanism, the chain hanging point changes to step two plate angular position, use a scraper to replace two scraper, need a jump ink action, jump ink action performed by specific institutions.
Support device, gives the platform: is used for fixed substrates.
1) should have calendar positioning device.
(2) platform height and level control device.
Version of institutions: the version of the mobile platform position, when is usually accomplished by mechanical thread spinner, and should have reliable locking device and shifting direction (dovetail groove or guide key, etc.).
Drying equipment: infrared electric heat pipe hot air drying or uv-curable drying device.
Electrical control device: the work cycle control, scraper position control, pressure control.
The kinds of screen printing press:
Classification according to the degree of automation:
(1) manual screen printing machine, printing process of all kinds of actions such as artifacts, scraping up and down, back to the ink, screen frame lift fall entirely on manual work.Can be divided into simple hand in net box, manual screen printing machine, precise manual screen printing machine, multi-color overprint manual screen printing press.
(2) the semi-automatic screen printer: on the basis of the manual screen printing machine, the printing of each basic movements, such as ink and back to the rise and fall of the reciprocating movement of the ink, printing equipment, net frame of the ups and downs, calendar adsorption and alignment, air control and so on, according to the fixed program automatically by a certain institution, and work-piece by hand only, this is what we usually
Semi-automatic screen printer.
(3) automatic screen printing machines: it is with automatic feed (material), automatic printing, automatic drying and automatic screen printing machine paper (material).Printing speed can reach more than 5000 printed/hour, is suitable for the continuous bulk silk screen printing, can ensure the stable quality of printing quality.
The adjustment of the silk screen printing machine, installation and maintenance:
The machine work cycle phase adjustment:
By the factory according to the design cycle of phase diagram adjustment strictly, and wear the pin or lock.
Operation adjustment:
Guide rail, plate and working platform adjustment of parallelism between the three layers: general adjustment on the guide rail or platform.
1) platform and guide rail shall be parallel, scraping board is along the guide rail movement, if both are not parallel, scraper will not always contact platform at a certain pressure, appear even clearance, this has also been a change in the machine before they leave the factory in tune.
(2) screen plate and platform should be parallel, otherwise the network distance (silk screen plate floor to printing the distance), cause the printing pressure and silk screen printing plate deformation, therefore, the flatness of screen frame itself should be guaranteed, generally by the users according to need to put forward specific requirements.To adjust: refers to the silk screen printing on silk screen printing precision adjustment between the plate and the calendar.Height adjustment (> 40 mm), before and after adjustment and around (> 20 mm), horizontal Angle adjustment (> 3 °).
Scraping plate adjustment:
(1) the adjustment of scraping slabs platform parallel, about adjustment screw to adjust the scraping plate height;About intermediate shaft can be adjusted with top wire around the top silk, essence is high or low position to adjust to about the ink plate respectively.
(2) the scraper Angle adjustment quantity generally in the range of 65 ° ~ 85 °, can choose according to need.
(3) of the printing pressure adjustment, is actually to scraping board position adjustment.
(4) scraping plate length cannot adjust, press into a suite of supply, each set there are several different lengths to choose from.
Stroke adjustment: including the adjustment of the stroke size and stroke position.Based on the number of the crank and rocker radius R of the adjustment implementation schedule, R stroke increased, stroke length to 20 ~ 50 mm beyond design.
Network (Taiwan) from adjustment: by reducing the silk screen printing blocks or elevated platform can achieve network (Taiwan) from the adjustment, generally USES the raised platform.Silk screen printing plate network from the four corners to consistency, error is 0.5 mm or less.Network distance is commonly 2 ~ 5 mm, only when carrying network compensation action, is allowed from the former after the small network.
Scraping speed adjustment: every action is fast, faster every action to slow slow