1. The advantages of self-made curved printing machine
The curved printer itself is not a high-tech product. It is neither complicated nor esoteric. Anyone who has a little understanding of the principles of mechanical braking and has extensive experience in screen printing can take materials on the spot and make their own hands. Since the self-made curved printer has no electrical device, it also avoids the maintenance troubles caused by the failure of the circuit and the gas circuit in use; furthermore, the self-made curved printer is light in weight, low in cost, simple and flexible, and versatile. Not only does it change the bulkiness, expensiveness, single function, rigidity and uniformity of traditional curved printing presses, but also caters to the particularity and diversification of modern curved substrates.
Second, what is curved surface printing
As the name suggests, for the purpose of beautification, decoration, and embellishment, the surface structure or shape is not a plane, but a shaped object of various materials such as curved, arc, concave, and convex shapes, such as common drinking glasses, wine glasses, and tea that are commonly used in our daily life. Screen printing on specific or unspecified positions on the surface of cylinders, ashtrays, various bottles, tubes, test tubes, smoke cups, and measuring tools for chemical and medical tests can be called "curved surface printing".
3. The importance of scraper selection
The choice of squeegee is very important when printing on curved surfaces (Note: sometimes ignored by many screen printers), squeegee (also known as squeegee), specifically is a kind of squeeze the ink on the "forming screen" Hand or machine tools that are pressed onto the substrate are usually made of polyurethane rubber strips with a thickness of 8 to 10 mm and a hardness of 60 to 80 Shore (Shore A) and a wooden or aluminum handle. Experienced screen printers know that the squeegee used in curved surface printing must have the conditions of "two highs and four resistances", that is, high elasticity and high hardness; chemical resistance, solvent resistance, acid and alkali resistance, and abrasion resistance . Especially when registering and printing high-quality curved surface objects, the choice of the scraper should be more particular. Only in this way can the effect of double the effort be achieved, and practice has proved to be the same.
Fourth, the main principle of curved surface printer
We use a cylindrical object to illustrate. Most of the cylindrical curved substrates are printed with bearing-type outer diameter four-point support rolling. The self-made curved printer is no exception, but there are two more devices than other curved printing machines. The difference is that when printing objects that are super-conventional or with a large taper, and when encountering a "handle" container, a special "mini auxiliary runner" and a probe-type "inner diameter telescopic runner" are added.
â‘ The special "mini auxiliary runner" is printed for objects with a diameter of 0.8 ~ 2cm (such as craft chopsticks, ballpoint pen shells, writing brush holders, glass test tubes, etc.);
â‘¡Exploring rod type "inner diameter telescopic runner" is aimed at objects with large tapers that cannot be printed normally by the four-point support of the external mirror alone, and substrates with "handles" (such as ceramic tea cups, enamel tea cylinders, stainless steel fast food cups, etc. ) And specially designed. The device is light and stable when rotating, and can also be adjusted freely according to the inner diameter of the printing material. It belongs to the six-point support of the inner cavity, and can be adjusted to rotate and roll to complete the printing. The operation of scraping during formal printing, the regular positioning of the workpiece is the same as that of overprinting and conventional curved printing machines.
5. The working state of the curved surface printer
At present, the principle of action of curved surface printing machinery is mostly friction transmission, that is, the use of a scraper to "press" during formal printing. The "pressure" causes the font graphics or specific patterns on the screen to make "line-surface" contact with the substrate. The state (that is, what we often say "imprint line"), then the screen moves parallel and drives the substrate to rotate. At this time, the scraper passes by, causing the ink to transfer and complete the printing. It should be noted that: â‘ The fonts or specific patterns in the formed screen before the official printing can not be in contact with the substrate temporarily, and a screen distance of 2 to 3 mm (that is, gap) should be left; â‘¡It is well known that flat objects on the screen are printing Operation is much easier than printing curved surfaces, but there is not much difference in printing principles between curved surfaces and flat surfaces, but the process is slightly more difficult.
6. Postscript
There are many styles and complicated processes in curved surface printing, which requires screen printing workers to have a solid screen printing foundation and rich practical experience. Flexible and changeable for different shapes of objects and their corresponding printing methods or methods to assist The curved surface printing work was successfully completed. As long as practitioners master the principles of surface printing technology, continue to explore in practice, use their brains, understand with heart, be realistic and innovative, and accumulate experience, they will be able to print beautiful images, characters or graphics in bright colors to satisfy customers Requirements.
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