Pad printing machine is a kind of printing equipment, mainly used in plastics, toys, glass, metal, ceramics, electronics, IC, etc.Pad printing is a kind of indirect concave rubber head printing technology, is one of the printing and decorative objects on the surface of a main method.
Pad printing process is to design a pattern etched on the printing plate, the etching plate coated with ink, and then, through the silicone head will most of the ink transfer printing on printing objects.
Ink what type
Often USES common printing ink, the type and additive to the character design printing ink in plastic rubber, metal, glass, nylon canvas and other materials.Its characteristic is low cost, strong stickiness, ideal.But for PE/PP, baked porcelain is not applicable, shall be according to the design of text, size, and the choice of adaptability of substrates, the corresponding shi xi agent, the general selection standard.
How to design the jig
Should be according to the shape of the substrates, make a special fixture design, secure clipped on substrates, guarantee the printing accuracy and repeatability in the process of printing, take put for ease-of-use and safety of the operation.For number printing quality, in order to improve the efficiency, can design the conveyor structure.
The rubber head model
Rubber head should have good absorbency and deinking, good resilience, fatigue resistance, solvent resistance and other properties.Rubber head size, shape, soft and hard to control suppliers chart or physical model to make a choice, then according to the practical situation and life are used to determine a model specification.
Plastic head and contact deformation of substrates to small, its about 3 mm in diameter than the word.Such as plate fine line, rubber head should be relatively soft.Plastic extrusion depth of the head and substrates shall not exceed one-third of rubber head height, otherwise easy to damage of rubber head, ink case deformation.New rubber head surface with a layer of mold release agents, application before use clean cloth dipped in ethanol or washing agent rub-up.
The composition of electric pad printing machine
Electric pad printing machine's main components are: plastic head, oil pan, knife set, stepless speed regulating device, switch (/ operation manual), fixture lifting platform, etc.Because it does not need the traditional pump gas source, and USES the 220 v power source of mechanical and electronic continuously variable transmission system, the equipment has good stability, control accuracy, low cost, small volume, easy to use, reliable quality.
Scraper blade quality evaluation indicators mainly include hardness, thickness, elastic, blade straightness, etc.
General selection 0.Good flat steel strip for 25 mm elastic scraper.The parts should be sharp, smooth, flat, can closely match with steel sections.Scraper blade is not sharp or defect, can cause the ink scraping net and adhesive on the edge of the graphic or producing scraper ink mark, serious plate blown out streaks.Scraper with plate at an Angle when using, avoid scraping blade plate falling habilis sunken place, scraping hurt by too much.The length of the blade should be greater than design close to steel version of the width of the text.The pressure of scraper should be on the scrape plate under the premise of the graphic part of the ink, as small as possible.
A, the control of process conditions
The operation of the printing press
The stages should be familiar with the main body of the working state and, in turn, need to choose the job, small pilot after normal, in principle is just surface printing, buttons and display lamp.
The installation of the plate
Plate fixed ink dish in the middle, and then adjust the substrates of fixture, the glue head is aimed at the center of the plate by, and on the substrates of printing center, plate installation is complete.
The adjustment of the rubber head, machine speed control
In the pad printing operations, the whereabouts of rubber head and raised, to a certain extent determines the ink transfer rate, affecting the graphic forming.So the glue head, substrates, and the ink flow under the premise of adjustment in place, appropriate slow down the machine speed is helpful to improve the quality of printing quality.
Add solvent, the ink flow control
According to quantity one-time with good printing ink solvent, generally choose the ink and solvent ratio of 1:2 (fall winter and spring) - 2:5 (summer).That is too hot or quick-drying with slow release agent;Instead too cold or dry slow drying agent.Certain time intervals, on the basis of substrates in ink quantity to add a certain amount of diluted with good ink in advance.
Wet temperature control
The essence of which is to make the ink evaporation of solvent has a relatively stable speed.A simple way to control temperature and humidity is to print in the air-conditioned workshop.
Second, the problems and Suggestions for processing
The graphic distortions
Mainly by glue head on the surface of the load, hardness, thickness, size, depth of the radius of curvature and graphic and transfer between two relative center position deviation caused by.More choice of several types of plastic head, or in the past the normal steel version, source of troubleshooting, selected the correct process.
Turn inky light, outdoor
Mainly for selection and improper use of ink, ink is not too thin or thick paste to join.
Molecularly imprinted rough edges paste
Check whether the knife is sharp or have gap, ink is too thin, plastic head, steel version if there is a wear, etc.