Background technology
Laser hologram image anti-counterfeiting technology is a kind of stereoscopic photography, and according to laser interference principle, utilizing the method for space freqluncy coding to make laser hologram, is a kind of high-new typography utilizing optical technology.It not only can reproduce the main image of the original, can also with the change observing sight line orientation, manifest the side view that the original is different, laser hologram image utilizes the principle of white light diffraction grating, makes that image effect is changeable, multicoloured, bright and colourful, color is spirited, level is obvious, vivid, information and with high content of technology, and making and the reproduction technology content of laser hologram image are high, need professional, processing technology is complicated, and apparatus expensive, image itself has the advantages that to be difficult to copy.Therefore be widely used in the external packing of product, use as anti-counterfeiting mark.
Hologram has and integrates false proof and advantage that is aesthetic feeling, is thus widely used in many fields such as advertisement, illustration and packages printing.At present, product or external packing make hologram and substantially comprises following several mode: 1. make hologram blocking film or paper tinsel, transfer on stock by hot stamping process; 2. make holographic moulding film, adopt the mode of mold pressing to transfer on stock; 3. directly make holographic aluminized multiple film paper or transfer paper, be achieved in conjunction with registration printing by composite transferring.All there is complex process in these methods, requires the height thus high deficiency of cost of manufacture to equipment precision and operating personnel's level, and, these methods are when positioning holographic image, positioning precision is not high, and error, mostly in 0.3-0.4 millimeter, is difficult to meet the false proof requirement of hi-Fix.
Transfer paper is due to environmental protection, widely applied in packaging, reel transfer paper in process of production, film is needed to peel off and then rolling, film peel off after transfer paper in wrapup procedure again, the paper of internal layer is subject to the effect that wrapup procedure institute produces stress always, and inside rubs, so paper surface just causes wipe flower, often produce a large amount of waste products.
The configuration of intaglio press is relatively more flexible, and on line is gold stamping, on line is concavo-convex as being equipped with, on line crosscut etc. all has media report, but peels off in configuration on line, there is not yet relevant report.
Summary of the invention
Technical scheme of the present invention adopts a kind of hologram gravure locating print method, and it comprises following processing step:
S1: plate-making process, makes the laser plate with graph text information;
S2: painting process, utilizes coating apparatus evenly, to be densely coated with one deck mould release or paint for imaging on PET basement membrane;
S3: operation of aluminizing, surface is coated with the PET basement membrane of mould release or paint for imaging and aluminium device in vacuum evaporation plating machine, with vavuum pump, vacuum pumping is carried out to vacuum evaporation plating machine, then described aluminium is heated to 1200 DEG C ~ 1400 DEG C, make the described mould release of gaseous aluminum particulate in movement or the surface deposition of paint for imaging, then form one deck metallic aluminum of light continuously through supercooling;
S4: mold pressing procedure, utilizing the thermal change performance of laser plate immersion coating, is stamped on described aluminium lamination by the graph text information on laser plate, making the holography shifting film for shifting;
S5: compound working procedure, is bonded together described holography shifting film and base stock, first by uniform for recto applying glue, then is attached on the paper after applying glue by holography shifting film, then rolls laminating by pressure roller, then pass through oven for drying;
S6: stripping process, is separated PET basement membrane with paper, and making paper surface leaves glue and impression has the described mould release of described graph text information or paint for imaging layer and aluminium lamination, and wherein, the PET basement membrane after stripping can basement membrane repeatedly for being coated with;
S7: gravure operation, directly carries out gravure printing colour cell by under the condition of the paper through stripping process in not rolling.
In one embodiment of the invention; described stripping process and gravure operation on-line execute; owing to being on-line execute, therefore after stripping process, for ensureing the intensity of roll web at the not splicing place paper of stop unwinding; all fitted by adhesive tape in the front and back of splicing place; but due to after film stripping, taken away the adhesive tape of one side, this hidden danger just causing splicing place intensity to reduce; an adhesive tape must be pasted again for splicing place location again, and then carry out gravure operation.
In embodiment further of the present invention, due to stripping process and gravure operation on-line execute, therefore before PET basement membrane is separated with paper, the pendulum roller unreeled is furnished with floating roll-type tension pick-up, described floating roll-type tension pick-up is made up of cylinder and potentiometer, when upper chamber of air cylinder access compressed air, the tension force acted on film is roller gravity vertical stress component and vertical cylinder active force sum.Because dancer pivot angle is less, in swing process, vertical stress component is substantially constant, and therefore, the pressure directly changing cylinder just can adjust the tension force of film, and Tensity size and film coil diameter have nothing to do.In winding process, when tension force changes, the corresponding swing of dancer, potentiometer indirect detection goes out tension variation, through PID(proportional integral differential control) control coiling speed after adjustment, keep membrane tension constant.Except above-mentioned real-time strain controls, also exist along with film coil diameter increase, film spiral speed constant when, the process that angular speed reduces gradually.During beginning, coiled material acts on pulling force on dancer and the gravity of roller self, the thrust of cylinder balance each other, the equilbrium position that dancer mediates.Along with the increase of film coil diameter, pendulum roller upwards swings, and drives potentiometer to rotate, and makes feedback signal deviate from Yuanping City's weighing apparatus point voltage value.This signal, with compared with determining voltage signal, draws deviate, and after integral operation, adjustment motor speed, the rotating speed of motor is declined, and the tension force of coiled material returns to set-point, and original equilbrium position got back to again by dancer.Along with the increase of film coil diameter in whole winding process, motor speed constantly adjusts, and membrane tension is preserved constant.Under normal circumstances, film coil diameter excursion is generally 5 ~ 8 times, and when adopting service drive mode, speed adjustable range can reach about 10 times.Controlled by stable tension force thus ensure the hauling speed before peeling off, guaranteeing peeling rate and gravure speed sync.Same in stripping process, in the wrapup procedure to the PET film peeled off, controlled the rolling speed of the PET film peeled off equally by said method.
In another embodiment of the invention, in described compound working procedure, described applying glue adopts consisting of of glue: thermoplastic acrylic resin 17 mass parts, cellulose esters 2 mass parts, vinyl chloride-vinyl acetate resin 6 mass parts, acetone 35 mass parts, n-butyl acetate 28, organosilyl surface auxiliary agent 0.1 mass parts, cetyl dimeric ketenes 2.5 mass parts.
In another embodiment of the invention, in described mold pressing procedure, the temperature of mold pressing in described mold process should control between 150 DEG C ~ 180 DEG C, molding pressure in described mold process should control as 2kg, and in mold process, the speed of service of laser plate and PET basement membrane controls as 30m/s.Aluminize in operation described, described vavuum pump should reach 1.3 × 10 to the vacuum that vacuum evaporation plating machine vacuumizes
-2~ 1.3 × 10
-3pa.The thickness of described aluminium coated should control at 0.02 μm ~ 0.04 μm.
In the present invention further embodiment, in gravure operation, overprinting method is photo-electric chromatography, and it preprints cursor by photometer head recognition, judges overprint error and adjustment paper position by the computer program preset.
Advantage of the present invention and beneficial effect are:
1, anti-counterfeiting printing technology is combined with trans-printing technology, what the thickness of the aluminium coated transferred on paper can be made to do very thinly reaches 0.02 μm ~ 0.04 μm, and the thickness of aluminium foil is 6.5-7 μm in general aluminum foil composite paper, therefore adopting the technology in the present invention can save a large amount of aluminiums, the paper simultaneously after transfer is easy to fast degradation.
2, in press used basement membrane can be recycled, free from environmental pollution, and transfer paper also can reclaim for recycled paper.
3, intaglio printing on line is peeled off and unstripped reel transfer paper is directly unreeled by unreeling device, first peel off unit through on line, the film of transfer paper is peeled off, paper wood is directly imported the printing of gravure printing unit, solve because internal stress causes the phenomenon of wiping flower up hill and dale, improve the rate that manufactures a finished product, be significant.
4, by being equipped with tension pick-up on pendulum roller, according to tension detect result adjustment pendulum roller, peeling rate and gravure speed sync is ensured; Thus the high speed of a motor vehicle of intaglio printing on line stripping process is run, prove that the speed of a motor vehicle can up to 200m/min in this operation through test.
5, improve the glue in compound working procedure, its moldability is good without mass defects such as sticky version peelings, and hologram pattern is clear, possesses very strong antifalse effect; Completely, the good gloss of transfer paper planarization is high, and folding resistance is good in gum of aluminizing transfer, the strong adhesion of the adhesive force of aluminium lamination and Information Level, Information Level and paper substrate; Rear printing adaptability is good, and directly print after transfer slaking, the good leveling property of ink, no color differnece, stings the mass defects such as the end, quick-fried look, reverse drawing.
Detailed description of the invention
The present invention is illustrated below by further describing in detail.It is pointed out that following explanation is only illustrating the technical scheme that application claims is protected, any restriction not to these technical schemes.The content that protection scope of the present invention is recorded with appended claims is as the criterion.
embodiment 1
S1: plate-making process, makes the laser plate with graph text information;
S2: painting process, utilizes coating apparatus evenly, to be densely coated with one deck mould release or paint for imaging on PET basement membrane; The thickness being coated on the epilamellar mould release of described PET or paint for imaging is 1.0 ~ 1.5g/m
2.
S3: operation of aluminizing, surface is coated with the PET basement membrane of mould release or paint for imaging and aluminium device in vacuum evaporation plating machine, with vavuum pump, vacuum pumping is carried out to vacuum evaporation plating machine, then described aluminium is heated to 1200 DEG C ~ 1400 DEG C, make the described mould release of gaseous aluminum particulate in movement or the surface deposition of paint for imaging, then form one deck metallic aluminum of light continuously through supercooling; Described vavuum pump should reach 1.3 × 10 to the vacuum that vacuum evaporation plating machine vacuumizes
-2~ 1.3 × 10
-3pa.The thickness of described aluminium coated should control at 0.02 μm ~ 0.04 μm, and runs under dustless condition.
S4: mold pressing procedure, utilizing the thermal change performance of laser plate immersion coating, is stamped on described aluminium lamination by the graph text information on laser plate, making the holography shifting film for shifting; The temperature of mold pressing should control between 150 DEG C ~ 180 DEG C, and the molding pressure in described mold process should control as 2kg, and in mold process, the speed of service of laser plate and PET basement membrane controls as 30m/s.
S5: compound working procedure, is bonded together described holography shifting film and base stock, first by uniform for recto applying glue, then is attached on the paper after applying glue by holography shifting film, then rolls laminating by pressure roller, then pass through oven for drying; Applying glue adopts consisting of of glue: thermoplastic acrylic resin 17 mass parts, cellulose esters 2 mass parts, vinyl chloride-vinyl acetate resin 6 mass parts, acetone 35 mass parts, n-butyl acetate 28, organosilyl surface auxiliary agent 0.1 mass parts, cetyl dimeric ketenes 2.5 mass parts.
S6: stripping process, is separated PET basement membrane with paper, and making paper surface leaves glue and impression has the described mould release of described graph text information or paint for imaging layer and aluminium lamination, and wherein, the PET basement membrane after stripping can basement membrane repeatedly for being coated with; Roll web is fitted by adhesive tape at the back side of splicing place.
S7: gravure operation, directly carries out gravure printing colour cell (photo-electric chromatography) by under the condition of the paper through stripping process in not rolling.
In S6 and S7 operation, both on line run condition under, the speed of a motor vehicle up to 220m/min, percent defective <0.5%.And (namely after S6 stripping process, rolling is carried out to holographic transfer paper, again unreel laggard row gravure printing again in gravure operation) under normal operating conditions, percent defective is up to 2%.And gravure operation adopts photo-electric chromatography, chromatography precision <0.15mm.
the scratch test of embodiment 2 finished product transfer paper
Adopt holographic transfer paper (namely without the paper of gravure operation) prepared by embodiment 1, according to standard GB/T/T 9286-1998, cross-cut tester test is carried out to it, on the transfer layer on test product surface, 10 × 10 (100) 1mm × 1mm small grid is drawn, bottom that is dark and coating material of ruling with cross-cut tester; Clean down with the fragment of hairbrush by test zone; Cling tested grid with 3M600 gummed paper, to exert oneself wiping adhesive tape with erasing rubber, to strengthen contact area and the dynamics in adhesive tape and tested region; Catch adhesive tape one end, (90 °) shut down gummed paper rapidly in the vertical direction, and observe the situation that grid floating coat is left behind by adhesive tape, same position carries out 2 identical adhesion tests, and after 3 adhesion tests, result is as follows:
Comparative example 1 is only the composition of the applying glue glue used with the difference of embodiment 1, and the applying glue glue in comparative example 1 does not comprise cetyl dimeric ketenes, and other are all with embodiment 1.
Content of the present invention merely illustrates some claimed specific embodiments; one of them or more described technical characteristic can be combined with arbitrary one or more technical scheme in technical scheme; these technical schemes obtained through combination also in the application's protection domain, just as these technical schemes obtained through combination in the disclosure of invention concrete record.