Animation and textile printing

2022-07-25
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Examples of three-dimensional printing: animation and textile printing

three-dimensional printing is a new kind of special printing, which has broad development prospects. Now it is also emerging in other aspects besides conventional paper and plastic materials. For example:

three-dimensional animation printing

three-dimensional printing products, one of which is called animation. Stereographic printing mainly consists of six kinds of images assembled in one unit of grating; But the animation situation is mainly two images, rarely three images. After the cylindrical mirror grating film is used in animation printing, not only the three-dimensional picture film can be obtained, but also the moving animation can be obtained by changing the picture angle. We know that the right eye and the left eye observe different pixel lines, and hundreds of different pixel lines under the corrugated transparent sheet can be combined to obtain the stereoscopic image of the whole picture due to the different viewing angles of the two eyes. In addition, the observed pictures can get a three-dimensional sense when viewed from any angle, and 1, 2, 3 can be stored under each corrugated unit of the corrugated transparent sheet Pixel lines: when the positions of the left and right eyes move, the pixel lines 1 and 2, 2 and 3, 3 and 4 It is combined in pairs so that it can be seen continuously after being magnified through the transparent sheet. The animation is to make the texture of the corrugated transparent sheet form a horizontal position, and observe the pixel lines 1, 2, 3 with both eyes, There are 18 pixel lines in each column mirror unit with a grid distance of 0.6mm, and then they are made into animation by printing. It can also be said that pasting an original picture (equivalent to 18 consecutive sides of the film) into a photo, placing a grating transparent film horizontally on it, and shaking it from front to back is equivalent to the action picture that the film can show in one second. In addition, there is a kind of cartoon that makes different changes in several parts on the same picture. The steps for making this dynamic three-dimensional picture are as follows:

first of all, prepare a distinctive animation photo, which is made of 18 film pictures in turn. Using this photo as the original, add a thin, concave convex transparent plastic plate in front of the photographic plate of the camera, and then place a one inch, 300 line screen in front of the plastic plate at an appropriate distance. Then, the reflected light of the photo passes through the screen and the plastic plate to the photosensitive film, that is, the report points out that plastic will become the competitive advantage of 3D printing companies to make a photographic negative composed of continuous images decomposed by pixels. With this plate making and printing, a dynamic picture can be made. However, this picture is very vague when viewed in this way. The outline of the image cannot be seen clearly. Transparent cylindrical lenses must be attached on both sides to achieve the purpose of direct viewing with the naked eye. If the printed three-dimensional print is called three-dimensional space print, and then the dynamic factors are added to combine the three-dimensional sense with animation, a new four-dimensional space print can be produced

printing three-dimensional patterns on fabrics

printing graphics and text on textiles has always followed the traditional plane printing process. Printing technicians can print anything imaginable, but designers can only design plane objects, with the exception of foaming ink. Although the foaming ink can produce three-dimensional effects, it is difficult to control the foaming degree. Even when the best printers use foaming ink for printing, it is difficult to accurately copy the fine levels of the image

recently in the United States, a research group developed a new printing ink for T-shirt silk, with an ink layer thickness of 600 μ M or more, and the bulge of the ink layer can be effectively controlled. Compared with the previous situation, the thickest ink layer of ordinary printing is usually the ink layer of metal decorative ink printed on transfer paper. It is reported that at present, the ink layer thickness on flat and non porous substrate with good inking performance can only reach 250 at most μ m。 However, the ink layer thickness is not the most prominent feature of three-dimensional fabric printing. The most striking thing is its high resolution and clarity. Three dimensional printing can make the edge of the ink layer very clear and smooth. It looks like it has been die-cutting or laser engraving. Unlike transfer printing with high hiding power ink, Sweatshirt printing and plastic ink printing, the ink film of three-dimensional printing tends to have very thin edges. No matter how high the definition of the template is, the images printed by "the relevant person in charge of Zhengzhou Rixin building materials Co., Ltd. are easy to get dirty; Unlike foaming ink, it can print a very thick ink layer, but the edges are not clear and regular after curing. The three-dimensional printed matter is clear and clean. Since the 1980s, with the gradual systematization of textile four-color printing process, some people have been committed to three-dimensional printing to reform the T-shirt decoration process. However, due to translation and other reasons, 3D printing is often called "high-density printing". In fact, the ink film of three-dimensional printing is only a little higher than the density of conventional curing foaming ink, not as high as the density of high hiding power white plastic ink

the characteristic of three-dimensional image printing is not only the use of a different ink or emulsion. Successful three-dimensional printing needs to master different operating procedures and standard printing procedures compared with ordinary printing. Although it is not very difficult, it is very different, and it must be well combined with many comprehensive systems, so that three-dimensional printing can have a new and huge impact

as we know, the printing of textiles is based on silk, and the description here takes silk printing as an example. On the silk, 24 lines/cm of silk shall be used for 3D printing, stretched on the frame that can be stretched repeatedly, and the tension shall be at least 30n/cm. At present, this kind of silk has five wire diameters, ranging from 120 to 145 μ m. Practice has proved that it is better to use the wire with the smallest wire diameter, because the wire with the smallest wire diameter can fill the opening of the same version with as much ink as possible; In addition, it is better to use dyed silk, because the emulsion used in the three-dimensional printing process requires a long exposure time, and dyed silk can reduce the light scattering performance. On the template, the silk printing technicians know that the template thickness is the main factor affecting the ink film thickness, as well as in 3D printing. The template thickness is directly related to the cured ink film thickness. Practice has proved that the cured ink film can reach 90% of the template thickness if every operation procedure is ensured to be correct. In 3D printing, 200 is usually used μ Template of M. The current problem is not only to understand how thick the template is required for 3D printing, but also to understand the method of making thick template. The following will introduce the manufacturing methods of three thick templates, and discuss their advantages and disadvantages respectively. Although the emulsion used in each coating method described below is slightly different, rapid exposure must be used to compensate for the extra thick emulsion layer. Quick exposure SBQ photosensitive emulsion or pure photosensitive resin emulsion (liquid or diaphragm) is preferably diazo or double curing type

(1) liquid emulsion. The most basic method is to repeatedly coat the silk with liquid emulsion. It needs to be coated 15-20 times in the 21st century of silk printing, which is an environmental protection century, so that the template can reach the required thickness. First coat the first layer of emulsion on the printing surface of the silk, and then dry it thoroughly. In order to shorten the drying time, the drying room shall be equipped with a dehumidifier to keep the humidity at 40% - 45%. After the first layer of emulsion is coated and dried, tape around the image on the printing surface of the same plate to quickly increase the thickness of the template. Apply the second layer of emulsion, and then apply a layer of tape after drying. Repeat steps 2 and 3 until the required template thickness is reached. The advantage of this method is that it can be operated with familiar techniques. The disadvantage is that it takes too long (at least a few days) and the thickness of the emulsion layer is not easy to control. The most difficult thing is that due to the irregular coating method, it is likely that the total number of coated coatings will be missed

(2) capillary photosensitive membrane. A method for quickly making super thick templates. The most ideal material is a kind of thick pure photosensitive resin capillary membrane. Current 150 μ M direct capillary tablets have been sold on the market, 200-250 μ M diaphragm will be available soon. When pasting the capillary photosensitive membrane, prepare a flat plate, which is smaller than the size in the frame and larger than the external size of the image, with a thickness of 1mm, and the surface should be absolutely smooth. It is recommended to use glass plate, with smooth edges and corners and full contact between the wire and the diaphragm; Then put a capillary photosensitive film on the flat plate with the emulsion face up; Then put the silk on the capillary photosensitive film, with the printing side facing down. Pour a thin layer of liquid emulsion onto the silk along one side of the capillary photosensitive membrane, disperse the liquid emulsion on the whole silk, contact the capillary photosensitive membrane, and paste the membrane; Finally, dry the emulsion layer. However, it should be noted that the liquid emulsion compatible with the capillary photosensitive membrane must be used, that is, the sensitizer of the liquid emulsion used is the same as that of the capillary photosensitive membrane and has the same basic chemical properties. Most emulsion manufacturers are able to provide compatible emulsions and capillary diaphragms

to increase the template thickness, after the capillary photosensitive film/direct emulsion layer is dry, tear off the polyester substrate from the film and continue to paste another layer of capillary photosensitive film on it. The operation is as follows: prepare the coating solution in the proportion of 1 part of liquid emulsion and 15 parts of water, and stick adhesive tape on the opening part of the plate printing surface. Then, place the plate vertically against the edge of the cleaning tank and coat the capillary photosensitive film that has been pasted on the silk with the coating solution. Another layer of capillary photosensitive film is pasted on the film just wetted with liquid emulsion, and the emulsion layer is laminated with the emulsion layer. Dry the film and remove the polyester backing film. If you want to increase the emulsion layer continuously, you can repeatedly lean the version vertically against the edge of the cleaning pool, and coat the capillary photosensitive membrane that has been pasted on the silk with the coating solution. Repeat until the desired emulsion thickness is reached. The advantages of this method are that the thickness of the template can be increased as required, the surface of the template is smooth, and the emulsion layer is well controlled. The disadvantage is that the operation procedure is slow, which is certainly not as slow as the liquid emulsion coating

(3) manufacturing method of thick film sheet. The quickest way to make a thick emulsion layer is to use a diaphragm as thick as possible. Its thickness ranges from 100 to 700 μ m。 They are not capillary photosensitive diaphragms and require a special process. First, select a diaphragm with the required thickness, and the cutting size is 6-10mm larger than the image size on the template. Tear off the plastic protective film from one side of the membrane, put the emulsion face up on a flat plate (the flat plate is the same as the flat plate for sticking the capillary photosensitive membrane mentioned above)

put the printing surface of the wire towards the upper edge of the diaphragm placed on the flat plate. Then dilute the liquid emulsion and mix it in the proportion of 2 parts of emulsion and 1 part of water. Pour the diluted liquid on one side of the diaphragm. Scrape the emulsion on the surface of the diaphragm and cover it evenly. Brush off the excess emulsion and dry the same plate. After the plate is completely dried, the ink scraping surface of the plate is coated with a bucket coater filled with undiluted liquid emulsion. Dry the wire again, discard the second layer of plastic protective film from the film, and prepare for exposure. This method is the fastest way to make 3D printing template, but the supply of this template material is limited at present

as for the exposure of the plate, since the emulsion type, thickness, coating technology and exposure equipment will affect the exposure time, generally speaking, the exposure can be controlled as follows: for example, the exposure light source is a 50KW metal halogen lamp, 16cm away from the template, and the plate coating thickness is 700 μ m. The exposure time should be 7.5-8mln. After exposure, both sides of the plate

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