existAcrylic bottle basic knowledge of the wholeThis article has been on the acrylic material its characteristics and applications have a very detailed introduction, this article isacrylic bottlecombiningsilkscreen printing對亞克力進行更深入的研究，亞克力瓶如果僅僅限于印刷簡單的線條和文字，是不能滿足人們日益苛刻的工藝制品要求的。 今天，亞克力瓶絲網印刷開始涉獵彩色領域， 有機玻璃工藝制品進行彩色印刷也變得常見。彩色印刷和一般的線條文字印刷主要的區別在于網點，這和別的印刷工藝沒有區別，評價的標準也是看能否真實的還原原稿。絲印是亞克力瓶成品常用的工藝之一，因此性價比以及工藝特性，能和亞克力制品擁有相互相成的效果.

1. Sample analysis

Customers often provide Plexiglas samples for Plexiglas converters to design, he simply explains his intentions to you, and most of the task is done by you. It is important to understand his intentions, and in many cases disputes arise because you do not really know what he really thinks, you also need to find out the type of material of the Plexiglas sample and determine the printing process. Sometimes the customer knows the material type, but most of the time they don't, and you can use your judgment to identify it. Material type also determines the choice of printing parameters, such as the number of mesh lines, screen mesh, pre-press treatment, squeegee hardness and so on.

2.Selection of ink decolorization tester

Choosing an ink decolorization tester is both difficult and easy. You may be well versed in the suitability of the substrate and know what resins are good for the substrate. But the social division of labor does not care how much you know, you often just choose based on the information provided by the manufacturer at hand, you just have to verify the authenticity of the information. On most occasions it may be well suited, but there are exceptions for some special cases, and you may wish to have a few more of them on hand to experiment with.

The choice of the first from the theory of a simple understanding of the key to the existing varieties of tests. Silkscreen mainly have the following brands. Gao's (COA TES) is a famous brand produced by the British Coats Brothers, in the long-term production practice has established the authority of the solvent-based position. As an environmentally friendly products, you must be on the French company Dolby products "Dolby UV" will not be unfamiliar. Dolby company is not big, for UV but is the boss, from the initial screen printing and pad printing to UV credit cards and offset printing, Dolby company have not bad performance. Apollo is known for its vibrant colors, and it has gained wide acclaim for its current variety and adaptability. If you want to print on metal products, plexiglass products, when the first choice of Apollo, the German quality has always been the best in the world, the leading level of printing technology has led to excellent system quality, which of course includes the resin and pigment, Germany still holds the world record for the fineness and adhesion indicators. In the field of special printing, you can't help but pay attention to Marabu from Malaybau. "Supreme" is a speciality launched by HengHui Industrial Co. Ltd. to develop the mid-range market, I
The quality of our products is highly valued, but the results are even more important. Plastic prints printed with it even make you suspect that it was printed in Europe.

3. Consider the solidification process

The majority of plastic substrates used are volatile and dry. After the solvent contained in the solvent type evaporates, it is fixed on the top of the substrate. However, some prints require drying in a drying unit to dry, especially those involving metals, ceramics, plexiglass, and other materials.
For printing, a drying unit is generally required. It is important to configure what kind of drying device. For UV printing, the curing device should be considered.
UV does not contain solvents and can only be cured by ultraviolet light, and can be dried very quickly by either a drying device or a UV curing machine. If the degree of curing is too low, the ink layer will show poor adhesion and poor gloss; if the curing is too high, the film will be brittle and easily cracked and deformed.

4. About printing color sequence

Color print is through the superimposition of the four primary colors to replicate the original rich colors and layers of information, the theory of complete transparency to ensure the true reproduction of color, but is composed of resin connectors and pigments, the resin can not be completely transparent, the pigment itself has a certain degree of hiding power, these factors ultimately affect the color.

The order of stacking colors is related to the transparency. The opacity is not high covering power, should be printed first. Initially, the transparency of the worst yellow, yellow to print first, and now the situation has changed, the yellow ink printed first after printing does not matter much. Theoretically speaking, the four primary colors, in addition to the difference in hue, other indicators should be closer to the better, the fact is that another situation, the saturation of cyan has a great impact on the printing of the color, the saturation of cyan is high, so that the printed matter tends to be cooler, so when the saturation of cyan tone is high, you can put cyan in a slightly before the color sequence. The role of black is to increase the outline of the print, if the graphic requires a high degree of contrast, then print black last. Black density size of the print also has an impact on the print, too much density will cover some layers, so the density of the black can be placed in the first color sequence printing, the density of the smaller black ink in the last printing.

5. Determine the number of wires to be added to the network

The higher the mesh count, the more rich layers can be reproduced, but too high a mesh count can make screen printing difficult. Determine the number of mesh lines should first consider the visual environment, that is, from what kind of distance to observe the image, the visual distance should be the most basic criteria to determine the number of lines. Visual distance is closer, plus the number of lines can be a little higher, which can improve the clarity of the visual distance is farther away, plus the number of lines appropriate lower, which can reduce the difficulty of printing. Sometimes customers do not understand the characteristics of screen printing, and blindly ask for unnecessary mesh number, you should convince him to change his mind. Screen printing reproduction range is usually below 80 mesh, screening line number is too high in the highlight areas of the printing will appear dot loss phenomenon, the details can not be reproduced. In addition, a high mesh count can make screen selection difficult. In accordance with the usual selection method, the screen mesh should be 4 times the number of lines of the screen of the plate. Too high a mesh number will cause the ink layer is too thin, the contrast of the text will be reduced, which will also affect the image of the expressive power.

With the increase in the number of lines, the size of the dots continue to decrease until the dots can not be printed. Screen printing is not like offset printing can be copied 3% to 98% of the dot, it is strictly speaking can only be copied 15% to 85% of the dot, higher than 15% of the dot to be lost, less than 85% of the dot will be expanded into the field, for the level of the original is very fine, scanned into the computer needs to be leveled corrected and tone compression to be restored. The compressed image highlights and dark toned dots are easily reproduced for a given number of lines. Of course, over-compression of the tonal range will result in some loss of detail in the image.

6. Determine the resolution of the floppy output

If the output resolution (dpi) is set too low, the film will appear jagged, if the resolution is too high (the number of lines remains unchanged), the layers of the film are certainly richer, but the number of gray levels will increase exponentially, the reproduction capacity of screen printing is limited.
This even makes screen printing impossible. Screen printing has proven difficult to reproduce prints with more than 100 lines. Of course, technological developments have driven screen printing forward and this conclusion is not absolute.

7. Selection of screens

The screen should have the same number of threads and balanced tension in the warp and weft directions, otherwise it will cause tortoise and overprinting inaccuracy. Screen parameters should include wire diameter, mesh size, tension curve and screen thickness.

(1) Choose a low mesh screen for rough graphic printing and a high mesh screen for fine graphic and hierarchical printing;

(2) The choice of screen mesh should be matched with the number of mesh added to the soft plate, generally 4 times the number of mesh added to the soft plate as the screen mesh;

(3) For UV, the mesh size should not be too low considering the curing effect.

(4) Fine graphic printing and hierarchical printing preferred color screen, color screen resolution is much higher than the white screen.

(5) Choosing a mesh calculator can help you get data support and determine the relationship between static mesh count and dynamic mesh count.

8.Setting the press stroke

First install the substrate, then hold the squeegee by hand to move on the surface of the substrate, and fix the stopper when the position is suitable. For curved screen printing presses, the stroke for adjusting the movement of the screen plate should exceed the circumference of the plastic bottle. A proper stroke saves time and
Increases printing speed and also reduces the incoherence of inking, and can print good dots.

9. Selecting a squeegee

Generally the squeegee length is about 5~10mm longer than the image length. The choice of squeegee involves both hardness and shape. Harder squeegee can carry out very fine graphics and layers of printing; softer squeegee is suitable for printing surface is very rough substrates
Objects, printing ink layer is also thicker. Curved surface printing often choose pointed scraper, flat printing often choose rectangular cross-section of the scraper.

10. Selecting the screen frame

Screen frame materials preferred aluminum products, it is relatively light, strength is also very high, suitable for printing layers of images, especially four-color printing, you must choose a good rigidity of the screen frame, special printing industry uses a lot of screen frame belongs to the non-standard parts, this is because of the special printing of the substrate shape of the strange caused by the strange. It is important that many custom-made frames are not constrained by the screen printer when completing a screen printing job. An important aspect of choosing a frame is to be able to maintain a balanced tension in the printed image area.

Mesh frame manufacturing is also an aspect to be considered; the frame should be as stiff as possible, with good resistance to bending and twisting.

11. Determine net spacing

The screen pitch is the distance of the screen plate from the surface of the substrate. Setting the screen pitch too large or too small will change the size and accuracy of the image.

Excessive screen pitch will cause image enlargement regardless of tension. At higher tensions, the screen separates from the substrate faster than the squeegee can run, which causes deformation of the squeegee. Excessive screen pitch is also very damaging to the screen. Sticky screen paste is not flawless, it may also fall off due to excessive tension.

Too low a screen pitch will cause the screen to separate from the substrate more slowly than the squeegee. Screen and substrate separation speed than the speed of the squeegee running slower, it will leave traces, and cause scuffing, the correct mesh distance should be able to ensure that the screen and substrate rapid separation. The choice of mesh spacing and screen tension, high tension screen can choose a lower mesh spacing, low tension screen should choose a higher mesh spacing, generally this data between 2 ~ 3mm.

12. Printing

Color screen printing should first pay attention to the overprint problem, only accurate overprint to obtain good prints. To achieve accurate overprinting, the first screen plate tension should be basically the same, the error is less than 1N/cm. With a screen tensiometer to determine the tension of each plate, should be maintained at 18N/cm. The uniformity of the positioning device is very important, each substrate in the printing must have the same position, otherwise it will cause overprinting is not allowed, four-color printing for the four primary colors, choose to comply with international standards can be avoided the problem of color error.

The establishment of testing standards for color products is conducive to the implementation of institutionalized management, to avoid disputes between producers and customers, it should be said that in the special printing industry in this area of work carried out very little, I believe that one day this situation will change.