How to make special screen printing to deal with s

2022-08-21
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How to make a special edition to deal with special printing

this article will tell you how to make a special edition to deal with special materials and print high-quality prints

in industrial applications, silk printing mills often face some unusual requirements, such as peculiar surface shape, size, fiber and material combination, which is only a small part of the many tests faced by silk printing mills. Whether silk screen printing can become the preferred method in industrial applications depends on whether it can meet these requirements, which will also bring considerable profits to manufacturers

in industrial applications, the most difficult print is not nameplate, oven panel or mass-produced membrane switch, but control panel and box. However, the functionality of plane metal parts, control panels and other heavy industrial components is more prominent than decoration, and the pattern is also relatively simple. It is usually a 1-2 color trademark structure. Almost all such products are made water-resistant by spraying metal to polish or sandblasting. What is really unusual and challenging for silk printing factory? Images should be printed on protruding surfaces such as bolts, inserts, skylights, protrusions, bolt heads, etc

traditional printing methods cannot meet the printing requirements of these products, but the improved screen printing technology can solve these problems well. Generally, there are three main printing methods of warning slogans in industrial equipment: pad printing, pasting ceramic decals or direct silk printing. Inkjet printing, computer processing, imaging and etching can also be considered, but it is not wise

pad printing technology

for irregular surfaces, the printing chamber will first consider pad printing. However, in most cases, pad printing is not a good solution. Although pad printing is suitable for curved surface printing, it requires that the surface of the substrate must be flat concave convex surface, so pad printing is not suitable for what we call industrial supplies. Moreover, the size and quantity of pad printing cannot meet the requirements of this kind of printing

the plate replacement cost of pad printing is another problem. Silk can be stored and reused for a long time, but the service life of pad printing plate is only about 12 months. Generally speaking, pad printing is only suitable for printing flat concave convex surfaces, and is not suitable for printing tables, buttons, switches, etc., so it is not suitable for the industrial applications we discuss here

ceramic decals

printers often choose ceramic decals to complete the production of some prints without a good solution. For the substrate with special surface, holes are often die cut on a piece of ceramic decal paper to make way for the position of the special surface, or multiple pieces of small ceramic decal paper are used to avoid the special surface

silk screen printing, die cutting and high-quality decals are a waste of cost for such a small print volume product. Even with digital printing and die cutting equipment, the cost is still considerable, and the quality cannot be guaranteed. In addition, once the ceramic decal is pasted on the console or instrument equipment, it is usually non removable, which limits the adjustability of the ceramic decal. Because when using ceramic decals, no matter what kind of adhesive you use, you must fix the equipment with rivets. On the other hand, there is no such concern about printing labels directly

silk printing

silk printing does not seem to be suitable for this kind of work. Because the plate will be punctured by the convex surface of the substrate, even if the convex surface is not sharp, the plate will relax or stretch when it comes into contact with it, which will deform the image and text. The problem is how to overcome it

making a suitable version is the key to solve this problem. The method is to leave a hole in the corresponding place of the plate, so that the plate and the substrate can be in full contact during printing. However, in this way, we insist on replacing backward production capacity by the same amount or reduction; To strictly control the correction of capacity growth will make the printing process become manual production, resulting in changes in the quantity and size of the quality hydraulic testing machine of printed images. Therefore, the printing quantity of these products is required to be less than 1000, or even less than 100

printing equipment

as mentioned above, when manual silk printing is used in the decoration process of products, it is necessary to standardize the printing equipment, mainly to follow the following requirements:

1. Accurate positioning

2. Ensure that the version is stably fixed on the version system

3. Ensure that the lifting position of the plate lifting device is accurate

4. the printing desk system can accept different device configurations

in most printing plants, these parameters of the printing machine are custom-made doctor blades

one or more doctor blades are installed in a printing unit. These scrapers require proper handle, moderate hardness and blade edge. If you need to use a soft scraper (for example, when printing wrinkled surfaces, it is necessary to choose a hard support plate to prevent the blade from bending too much.

supporting equipment

printing of special products requires many processing methods, including die cutting, drilling, film coating, etc., but this is the same as printing general prints. As long as there is a complete original, an appropriate version, special ink and efficient workflow, the ideal copy can be easily obtained.

version design

version consists of frame, 0 The frame is composed of 125inch thick metal aluminum base plate and wire, and any kind of aluminum alloy frame can be selected

this special plate structure is suitable for printing plane prints with bulges. The raised three-dimensional and complex tension make this version can only be completed by hand. But it doesn't matter, because the printing volume of this product is often very small

there are two ways to make this version: the first and easiest way is to make the bottom plate, make its inner diameter coincide with the frame, and then paste the stretched version into the base plate; The second method is to make the outer diameter of the base plate coincide with the frame, fix the base plate on the frame, and then paste the stretched version into the base plate. Which method is better? This depends on the size of the version and the flatness of the negative. The first method can use a circular frame, which is suitable for the production of flat base plate with a mesh of less than 650 ~ changing the protective column 775. However, the second method is more suitable when the flatness of the bottom plate is poor or the requirements are too high, but this method can only use square frames

substrate opening is also required. The position error of the corresponding hole on the substrate of the protruding surface of the print should be within 1.5mm, because its allowable registration adjustment range is ± 1.5mm. The position error between the edge of the printing area on the substrate and the image should also be within ± 1.5mm, with a width of less than 6.5mm and a length of less than 50mm

therefore, when making a version of a special print, we should follow the basic principles of version making and select the appropriate substrate location. The size of the image determines the size of the version. If the "warning" is printed on the large panel, the small version shall be used

in addition, if there are several images on the whole panel, making a large version is more reasonable than making multiple small versions, because it can save time and cost

imaging requirements

traditional methods can be used for plate making, but using capillary photosensitive diaphragm for plate making is more practical than traditional photosensitive methods. This can not only save the use of many materials, but also better control the thickness of the plate and get a clearer image. The wire plate is allowed to have a registration tolerance of ± 0.062inch. Therefore, in order to present the precise position of the image on the silk, using the plate making machine is a good choice. However, when making plates, we must pay special attention to the following aspects:

1. The position of the plate in the printing machine

2. Image preparation

3. Plate clamping position of plate support frame

4. maximum ink volume

printing

appropriate scraper length is also important. Its length must be greater than the width of the image and smaller than the size of the version. For example, for 76mm wide images and 101mm plates, the scraper should be 88mm. When printing images with small area, the distance must be kept to a minimum. According to the size of the image, the distance should not exceed 0.5 ~ 1.0mm. Otherwise, when the image is very close to the printing edge, the plate cannot finish printing, and the silk will also be damaged and loose. However, if the silk sticks to the substrate due to low pitch, it is best to adjust the ink suitability rather than adjust the pitch

summary

silk screen printing usually uses special inks to meet the printing requirements of special surfaces more directly and simply. In the past, printing golf balls, Western dishes, glasses and many industrial products could only be represented by silk printing. Today, many other imaging methods can do it, even better. Fortunately, for the products mentioned above, as long as designers and engineers have enough courage to try this innovative way, this new and unique application method will make silk printing have a broader market development space

reprinted from: printing industry

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