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Have you seen the cute little cards that are included in the food packaging? Tilting the card or moving the card back and forth will see a variety of fantastic effects. These plastic cards are the grating prints we are familiar with. Today, printers are using raster lens printing to get more complex products, from labels, posters to packaging products, and even plastic cups. Although we are not seeing the stereoscopic effect in the true sense, it is only a visual deception, but lithography is not only a small game for children, but also has a very broad development prospect.
Mike Chadwick, production manager at KBA's Karat 74 direct imaging press, said that raster printing is no longer as complicated as it used to be. In the past, raster printing was seen as a mysterious technique. With the development of new software and the development of printing presses and other process technologies, lenticular printing has gradually become the mainstream of the printing industry.
Chadwick also reminded everyone that despite technical and software support, raster printing is still a very demanding technology. If the printer does not understand the principle of raster printing, then we are like playing water rowing, letting the rowing boat pull, can not grasp the direction. Compared to plastic printing, lenticular printing is more costly, more complex and more sensitive, and requires more prepress technology.
The singular visual effect of raster prints is the combination of digitally integrated images with ribbed plastic gratings. The key steps in the production include interlaced scanning software to process the image, requiring the computer to have enough processing power to process the scanned image file. The amount of data in such files is generally large.) Plastic grating plate forming technology and prepress and printing The accuracy of the equipment.
What is special about the grating
If you look closely at grating materials, you will find that printed grating products face more challenges. According to the Lenstar organization (a group that provides online resources for designers, agents, and printers), one side of an extruded plastic grating plate is a small wrinkled wrinkle called a small grating; the other side is smooth. On the surface of the print.
Cylindrical gratings of the same size evenly spread across the entire surface, with resolutions ranging from 10 to 200 lines per inch, depending on the application. The grating thickness is between 0.008 and 0.385 inches.
Printing on grating materials also faces the same problem as plastic printing: lenticular printing is more expensive than printing on paper. If the environment is not controlled, the plastic will deform such as shrinkage or expansion. Moreover, the plastic is a non-porous material, and the ink printed on it is difficult to penetrate, and only stays on the surface. Therefore, unless UV printing or other drying methods are used, the production process will be much longer.
Although we can use traditional printing methods to print grating products, many experts agree that UV printing is easier to implement. John Santie, head of production at Mitsubishi lithographic offset press USA, said: "We believe that UV printing has a stronger advantage in terms of drying or substrate absorption." Companies that invest in grating printing should have UV. The experience of printing, otherwise it is asking for trouble.
What is what the customer wants
Santie also added that the real challenge in raster printing is color separation, and printers should be trained to understand what products are quality products and how to understand the real needs of customers. He explained that the final result of the print determines the printing method that the printer should use. Or, how to choose the number of screen lines or the resolution on the grating plate to achieve the desired image quality.
Raster printing requires a more precise registration than plastic prints - otherwise, it does not exhibit special effects. In a recent issue of Heidelberg News, an article pointed out that the stereoscopic effect of a grating is obtained by separating and recombining images into small gratings. Therefore, if the paper is not overprinted, even if it is extremely small deviation, the product will become waste. Even the smallest gaps can affect the overall layout.
Since the operation of the printing cylinder differs depending on the printing machine and the different printing units on the same printing machine, all these differences do not affect the traditional printing work, which can be ignored, but for raster printing is very important.
If some of the pixels on the grating plate deviate, this error is clearly exposed. For example, imagine that if a magenta version of a print containing a person's face is not registered, even if the magenta version is slightly more prominent than the other color versions, when the pattern changes, you will see it first compared to other colors. To magenta, this picture becomes a waste. Therefore, the production of raster prints requires very high precision.
The continuous improvement of small format printing presses has achieved satisfactory "accuracy requirements". The small format printing machine is more clean and accurate, and can produce high quality products.
It is very important that the grating is properly aligned with the lens. There can be no deviations - the image should have the correct resolution, corresponding to the resolution of the raster, and also the line of sight of the human eye. Whether it's making small hand-held cards, posters or making curved materials for wrapping other products, there are many techniques involved, not just the simple matter of putting ink on plastic.
Direct imaging (DI) printers are also a viable solution for lenticular printing. The higher registration accuracy combined with the short print preparation time of the DI press makes the DI press the best choice for printing hundreds of to thousands of raster prints.
According to Stephen Sanker, Presstek's DI press sales manager in North America, the advantages of the DI press are the registration of the single plate and the fast drying speed.
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Pay more attention to the selected image itself instead of blindly increasing the depth of field, otherwise it will ruin the effect of the entire print.
Lithographix: Seven years of raster printing
Raster printing requires very precise registration and image files are large. The color and the split files must be controlled and managed during the printing process to accurately fit the image and the grating plate together.
Many salesmen and printers boast of their own products without knowing the technical parameters and not knowing how the grating plates are extruded. Raster printing also requires processes such as proofing and complicated printing inspections.
Universal Lithographers: Precise feed feed registration
Through professional multi-color printing production, Universal's sales climbed to $6 million. Applications for lenticular printing include promotional items such as POP point-of-sale advertising and POS selling services. The company currently uses Photoshop as interlaced software, which is very labor intensive, so the company is currently evaluating professional software for test raster printing.
The Roland 700 vacuum feed table and pneumatic side gauges are ideal for raster printing. When the press speed reaches 12,000 sph, the speed of the grating plate will be reduced by 65% when it hits the front rail.
Unlike other brands of presses that use a roller to correct the orientation of the paper, the Roland 700 has an suction pad under the paper that pulls the grating plate straight without leaving any traces. Registration of the feed unit is very important for lenticular printing, and Keller tells us that the Roland 700's fluted plate feed handling capability and conveyor are excellent for this job.
Blanks Printing: DI shows hands
The bite of the printing press is released after the substrate is jammed until the four-color printing and coating process is completed, thus ensuring accurate registration. In addition, the printing press has a shorter preparation time and is more economical than a 40-inch press.