laser small tectonic technology is used at plate making

3-4.

4 meters, round circumference 0.

3-2.

2 meters, exterior accumulating can amount to 10 square metre. It is 60-400 line when screen resolution / centimeter when, the ink cell amount on platen is normally 108 to 1010. To be in most good image processing is done inside economic time, requirement laser has tall pulse repetition rate and high average power. To with thermo-optic for the massive small sculpture that ablation is a way, the most effective method is: Use light beam of laser of a bundle of pulse, its are individual laser pulse founds a complete ink cell. Average power is focusing of a kind of job the 500 tile, tone Q Nd:Y that repeats frequency to be 70 kilohertzAG laser system (refer to a graph 3) can make bulk ablating rate of zinc achieves 1 cubic metre centimeter / minute, area ablating rate is achieved 0.

1 square metre / minute. The appearance of ink cell is decided by the intensity weaveform of laser light beam. Half-autotypical ink cell (deepness and diameter are on ash rank all alterable) can arise by the laser of weaveform of gauss beam of light, and traditional ink cell (diameter of change of the deepness on value of each gray scale is changeless) arise through using flat bottom weaveform (refer to a graph 2) . The size of ink cell depends on pulse energy, through using acousto-optic modulator is controlled by digital image data set. Limits is 25 meters of diameters to 150 meters, can define the screen resolution of image; Limits is 1 meter of deepness to 40 meters, can define presswork the gray scale value of the dot. The heat that frit expects is conducted and thermal convection current must be decreased to lowermost limit. Accordingly, daetwyler company developed the material of special report galvanization of a kind of accessary and organic additive, its heat conductibility is lower than common zinc structure. Through vaporization ablation this is planted special zinc, fused area and burr can be decreased to reach thin thin deposit (all round ink cell inside 2-3 rice) . Whole platen surface passes a path of continuous helix shape ink cell to undertake alternant sculpture. Achieve when platen rotate speed 20 turn / when the second, machine a head with 15-150 micron / the sideslip feed that turn, parallel moves at drum shaft line (depend on screen resolution) . The leader ply between ink cell is in rank there is 4-6 micron only when tone pitch is the biggest. Of platen of illuminate of this requirement beam of light aim at precision to achieve about 1 micron. The high power that another kind of method is use pulse modulation is fiber-optic laser (average power 500 tile) , its pulse repeats frequency but modulation limits is 30-100 kilohertz. When frequency is 35 kilohertz, there is more energy on pulse every time, make thereby second percussion can get sheet big ink cell (if screen is 70 lines / centimeter when the diameter is 140 micron) . When frequency is 100 kilohertz, every time the energy on pulse becomes little, consequently sculpture gives small ink cell (if screen is 400 lines / centimeter when the diameter is 25 micron) . Of the operation dispute contact of laser light beam, carve photograph comparing with the Electromechanical of slate pencil of use King Kong, this is a crucial dominant position. Should presswork only craft is had can forecast gender and but repeatability, can be in platen assures carven uniformity on whole width. Because,be Gao Ke repetition rate, technology of laser of single shot only acupuncture point is carved than Electromechanical about 10 times faster. Modulation of weaveform of intensity of Nextpage beam of light pressworks the base stuff that there is a lot of differring on the market (for instance paper or stretch foil) , every kinds of material is having different exterior character. Printing ink transfers optimize a method to rely on: Base surface (if surface roughness, printing ink absorbs ability) , printing ink parameter (the viscosity that is like dye or model) , forme. To every kinds of different situation, the sculpture ink cell that can use different figure in order to achieve best. Be conducted except heat and besides convection, ink cell stated the focal strength of laser light beam is undee accurately. Reach specific figure to let every ink cell, the stereo intensity weaveform of beam of light is formed actively in real time, be as high as 100 kilohertz by frequency of image data pilot. The overall program of technology of this one stereo modulation is shown 4 times like the graph. The active modulation that passes intensity weaveform and every time the independence of laser pulse energy changes, the appearance of each single ink cell, diameter and deepness can become independent decision. This one new-style ink cell in the forme craft that make calls super Halfautotypical ink cell (SHC) , be Halfautotypical ink cell is outspread (semi-automatic model the deepness of ink cell and diameter are change, but cannot control independently) . SHC modulation makes system of a laser can carve all sorts of ink cell (traditional, Autotypical, Halfautotypical) . The technology that needed to differ in the past (Electromechanical sculpture, chemistry etchs) . Now, can make appearance of complete new ink cell, it is every kinds of color thereby %- rank tone pitch and presswork base optimizes printing ink to transfer character and comfortable imprint function. The strategy and application besides modulation of weaveform of SHC beam of light " single shot only acupuncture point " outside the method, still can pass overlay the means of successive laser pulse will design sculpture ink cell, just spot diameter is smaller than the ink cell dimension of the requirement (for instance micron of spot diameter 10-15, ink cell dimension 100 micron) . The scanning plan of the appearance that forms ink cell and modulation of internal composition hang on, jackknife and laser pulse (if scanning of image typesetting machine is algorithmic) . Successive wave laser is switch or ash rank of modulation, can carve a petty jackknife stripe, form lozenge ink cell. The high resolution that its advantage depends on image (for example to carry a pace to grow to obtain 1000 lines for rate of differentiate of 10 micron time / centimeter, spot diameter is 15-20 micron) . Its inferior position depends on the loss of productivity, need is passed use taller modulation frequency (about 1 megahertz) and head of sculpture of much beam of light will make up for. As a result of its the height when focusing is worth power, gao Liang spends fiber-optic laser (200-600 is made of baked clay, successive wave, pulse modulation) perhaps exceed short pulse laser to be able to implement this kind of advanced sculpture method. Besides zinc, this kind of tall brightness can be used at carving other data likewise, for instance copper is mixed pottery and porcelain. Algorithm of process of scanning of image typesetting machine applies to a lot of high resolution 2 dimension (presswork) apply and three-dimensional (printing) application. Carve RFID sunken Yin Gun for example. Printing electronic technology is a coming new technology, the accuracy that electronic component and the high accuracy that circuit asks will be printout and uniformity set are new fiducial. The organic or inorganic printing ink of conductor and semiconductor is mushy for the most part, presswork rise very laborious. To these printing ink do not have aperture equably statified for, the exterior grain that controls appearance of ink cell geometry and forme of form of intaglio printing accurately is very crucial. Graph 5C showed the sculpture of RFID label antenna experiments, contour line width has 10 micron only. Summary and looked into laser technology to combine a number to become like the method, improved a tradition to presswork plate making craft, promoted the efficiency of printout, screen limits, accuracy and quality. Can use corresponding algorithm, use different laser type. The laser light beam that uses modulation is undee, at present craft of SHC of single shot only acupuncture point is the craft with the rapiddest rate that is used at form of intaglio printing, can use at all sorts of base, printing ink to mix presswork. The new-style sculpture that uses source of high power TEM00 is algorithmic, the application of laser ablation method limits expands to a series of industrial application, if be used at large area material,turn imprinted reticulation roller, use at pressworking design of high accuracy gravure and use at three-dimensional printing tool. When these two conditions satisfy the laser power that should need and algorithm of new-style sculpture maturity, exceed short pulse laser to aux will be able to is driven quite and improve afore-mentioned methods. The challenge that faces in the future will be: Use skin second exceeds short pulse laser to optimize ablation craft. Laser Technology Combined With Digital Imaging Methods Has Improved The Traditional Processes Of Print Form Fabrication Regarding Efficiency, range Of Screens, precision, and Quality Of The Printout.

Different Laser Types Can Be Utilized By Applying Appropriate Production Algorithms.

Today, the One Shot One Cell SHC Process With Modulated Laser Beam Profiles Is The Fastest Process For Gravure And Can Be Matched To Different Substrate, ink, and Printing Conditions.

The Challenge For The Future Is To Optimize The Ablation Process With Picosecond-ultrashort-pulse Lasers.

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