There are several methods of textile printing, of which there are two printing methods of commercial importance: screen printing and roller printing. The third method is thermal transfer printing, which is of relatively low importance. Other printing methods rarely used in textile production are: wood stencil printing, wax valerian (ie wax anti-) printing, yarn tie-dye printing and anti-dye printing. Many textile printing factories use screen printing and roller printing to print fabrics. Most thermal transfer printing performed by printing plants is also printed in this way.

1. Screen printing

Screen printing includes the preparation of printing screens, printing screens (screens used in the printing process used to be made of fine silk, this process is called screen printing. Although silk screens are no longer used, printing The name silk screen printing is still often used in the process.) It is made of nylon, polyester fiber or metal wire fabric with fine meshes tightly bound on a wooden or metal frame. A layer of opaque non-porous film should be coated on the screen fabric. Where there is a pattern, remove the opaque film and leave a screen with fine meshes. This area is where the pattern will be printed. Most commercial mesh fabrics are first coated with a layer of photosensitive film, and then the film is removed by patterning to reveal the pattern. Place a screen on the fabric to be printed for printing. Pour the printing paste into the printing frame, and force it to penetrate through the mesh of the screen through a scraper (a tool similar to the wiper on the car windshield).

Each color in the printed pattern requires a screen alone, the purpose is to print different colors separately. Example 3 Color printing requires 3 screen frames, and 3 colors are printed on the fabric separately. In addition, the pattern of each color in the pattern must be accurately positioned on the screen so that the position of the pattern after printing is accurate, to avoid the phenomenon that the green stem of a rose is printed in the middle of the red petals. Printing on flowers refers to the industrial term that all pattern colors are accurately printed on the fabric.

There are three methods to realize screen printing, and the application principle of each method is basically the same. The first is manual screen printing, which was very common in the 1920s and is still widely used today. Until the mid-1950s, before modern technology gave this process automation means, manual screen printing had been the only screen printing method. The second method is called automatic screen printing (also known as flat screen printing and automatic flat screen printing). In the mid-1960s, with further development, the shape of the screen changed from the manual and automatic flat screen to the shape of the round screen. The third method is called round screen printing or round screen printing, which is currently the most widely used screen printing method.

Second, manual screen printing

The manual screen printing is commercialized on a long platen (table length up to 60 yards). The printed cloth roll is smoothly spread on the platen, and the surface of the platen is pre-coated with a small amount of viscous material. Then the printing worker moves the screen frame continuously by hand along the entire platen, printing one frame at a time until all the fabric is printed. Each screen frame corresponds to a printing color. The production speed of this method is 50-90 yards per hour. Commercial manual screen printing is also widely used to print cut pieces. In the garment piece printing process, the garment making process and the printing process are arranged together. Before the garment pieces are sewn together, the customized or unique patterns are printed on the garment pieces. Because manual screen printing can produce large screen frames for large flower patterns, this printing method can also be used to print fabrics such as beach towels, novel printed aprons, curtains and shower curtains.

Manual screen printing is also used to print limited, highly fashionable women's clothing and to print small batches of products for market exploration.

3. Automatic screen printing

Automatic screen printing (or flat screen printing) is the same as manual screen except that the process is automated, so it is faster. The printed fabric is transported to the screen through a wide rubber belt, instead of (like manual screen printing) placed on a long table. Like manual screen printing, automatic screen printing is also an intermittent rather than a continuous process. In this process, the fabric is moved under the screen and then stopped. The screen is scraped by a scraper (automatic scraping). After scraping, the fabric continues to move under the next frame, the production speed is about 500 yards per hour . The automatic screen printing tuo can only be used for the whole roll of fabric, and the cut pieces are generally not printed by this method. As a commercial production process, the production of automatic screen printing (referred to as flat screen printing) is declining due to the preference for using round screen printing with higher production efficiency.

Four, round screen printing

Rotary screen printing differs from other screen printing methods in several important ways. Rotary screen printing is a continuous process like roller printing, which will be described in the next section. The printed fabric is transported under a continuously moving circular screen cylinder through a wide rubber belt. In screen printing, the production speed of rotary screen printing is the fastest, which is greater than 3500 yards per hour. Use seamless perforated metal mesh or plastic mesh. The circumference of the largest round screen is greater than 40 inches, so the largest flower size is also greater than 40 inches. Rotary screen printing machines with more than 20 sets of colors have also been produced. This printing method is slowly replacing drum printing.

5. Roller printing

Cylinder printing is like newspaper printing. It is a high-speed process that can produce more than 6000 yards of printed fabrics per hour. This method is also called mechanical printing. In cylinder printing, the pattern is printed on the fabric through a carved copper cylinder (or roller). The copper cylinder can be engraved with very fine lines closely arranged, so it can print very delicate and soft patterns. For example, the fine and dense Pellsley swirl tweed printing is a type of pattern printed by roller printing. The engraving of the flower tube should be exactly the same as the design artwork of the pattern designer. Each color needs a carving roller. (In the specific printing process of the textile industry, five-roll printing, six-roll printing, etc. are commonly used to represent five-color or six-color roller printing

Ceramic Coating Hair Curler

product's heating element is made of PTC material, 30s fast heat-up, you will get a perfect hair style in a short time. The ceramic heating enables smooth pulling motion without breaking or damaging to hair. The heat insulation tip keeps your skin from being hurt. Ceramic Coating Hair Curler A comfortable, effective and safe hair curler is especially designed for your hair beauty.

Hair Rollers,Hair Curling Iron,Spiral Hair Curlers,Magic Hair Curlers

Ningbo Meirou Electric Appliance Co.,Ltd. , https://www.mrhairstraightener.com