Analysis of corduroy printing technology
Corduroy printing has higher technical requirements and difficulty than general fabric printing. The overall effect of the fabric must be considered in pattern design. While strengthening the printing process and operation management, the quality of pre-processing and post-finishing must not be ignored.
Roller printing is suitable
In view of the characteristics of velvet, roller printing machines are generally used to produce printed corduroy. The reason is that roller printing machines have many ways to solve problems and have large leeway. Such as:
1. The roller printing machine can print three types of printing: optical roller (cylinder), second cloth (lining cloth, rubber cloth), and third cloth (lining cloth, rubber cloth, wool interlining cloth). Enterprises can print according to their own requirements. Choose the fabric specifications suitable for production by variety, and these three types can be modified at any time without spending a lot of money. If the variety specifications produced are suitable for smooth rollers, you can also save the consumption of lining cloth and rubber cloth. Generally, thick and dense fabrics use this kind of fabric. For many.
2. Velvet fabrics are heavy and dense fabrics. In order to obtain full color, no white core, and no exposed bottom, a certain amount of pressure must be applied to ensure the effect. The roller printing machine has a large room for pressure adjustment, and can be adjusted from Tonnage to kilograms.
3. Pattern depth and open surface, using diagonal lines or mesh visible processing varieties, design and formulate flower tube carving process to control the amount of pulp.
4. In controlling the amount of pulp to ensure the clarity of the pattern outline, the scraper is a key part. There are two types of roller printing scrapers: green steel and white steel, with blade numbers ranging from No. 18 to No. 26 There are 9 models in total. The texture of blue steel is hard, and the texture of white steel is soft and acid-resistant. The British or Japanese style is used for squeegee filing, and the large or small intersection angle with the flower tube can be used to see the properties of the color paste, the rheology of the color paste, and the pattern. Structural printing effect requirements and other factors are used to select and operate.
5. To prevent intarsia tube, slurry, tailing and other defects caused by the velvet of medium velvet fabrics, you can add light plate, fresh water roller, copper knife, brush or use brush to feed slurry Rollers and other measures to prevent.
6. Roller printing has a wide range of technology. You can choose any dye suitable for printing according to the overall printing effect requirements (such as: dyes that are not restricted by rotary screen mesh and highly corrosive) and some Stable insoluble azo dyes with coarse particles and certain dyes that are not suitable for pumping to the slurry and easily change their physical form and viscosity (insoluble azo dyes).
Precautions for rotary screen printing
With the emergence of rotary screen printing machines, improvements in equipment and process technology, the production of corduroy rotary screen printing is increasing day by day, but it is limited to rotary screen printing machines Due to certain limitations of its own conditions, printing velvet fabrics and thick fabrics is still inferior to roller printing machines in order to achieve the style of velvet fabrics. For printed products, there are many factors that affect the printing effect, which makes up for the printing effect. There are many methods. Here are some opinions on improving the quality of corduroy rotary screen printing for reference by industry insiders.
1. In pattern design, the pattern structure, pattern arrangement, etc. should be based on the varieties and specifications of the processing and the changes in the fabric and pattern form during each post-printing process. It will have an impact on the overall effect of the corduroy printed product and the fabric style. Consider the influencing factors.
2. The mesh selection of flower nets should not only consider the fineness of the pattern and the size of the block. It should be combined with the technology used and fabric specifications to determine the mesh number. Do not ignore one thing and lose the other.
3. The difficulty of corduroy printing is that the velvet strips and the bottom plate have the same color. To solve this problem, in addition to considering the color paste, as far as the printing machine is concerned, it is the pressure. The pressure of the rotary screen printing machine depends on the screen. Squeegee pressure, the role of the rotary screen scraper is different from that of the roller printing machine. The scraper is mainly scraping, but is mainly pressed, supplemented by scraping. Its blades are of a single variety, with 4 numbers to choose from, and the blade thickness is 0.10- 0.20mm, height (width) 40-55mm, the cross section of the tangent point between the blade and the inner wall of the circular screen is arc-shaped, the pressure must be controlled appropriately, otherwise in order to increase the slurry supply amount, unlimited pressure will be applied, which will cause the blade and the screen wall to be out of tangent. Rather, the surface contact will affect the pattern outline effect, and it is also easy for the pile to be pressed and cover the pile groove, which is unfavorable for the pile groove to be colored. In this case, you can use the method of lining the knife with double thickness to increase the rigidity of the blade. The back side is inserted about 1mm below the blade as a lining knife. The lining knife can be thick or thin according to the needs. The blade of the rotary screen scraper is not as strict as the four-flat and three-gloss requirements of roller printing, but it should also be paid attention to, especially for fine patterns. In this case, beat it regularly with a rough grinding stone or fine sandpaper, commonly known as smoothing.
If there is a printing machine surface with magnetic rod conditions and a magnetic rod is used, the position of the cross beam of the printer cannot be ignored because the height of the cross beam plays a role in adjusting the mutual adaptation between the rotary screen scraper and the fabric. It directly affects the amount of slurry supplied by the scraper to the fabric. Generally, the beam position of the printer that mainly produces corduroy and thick fabrics should be lower.
4. For corduroy printing, especially for fine patterns, it is better to use anti-dyeing and discharge dyeing methods. Not only does the pattern have a strong three-dimensional effect, but it also avoids the disadvantages of color difference between lines and ground (groove).
5. To ensure the printing effect, the arrangement of the flower net is one of the main influencing factors, so the setting process is not onlyPay attention to the relationship between flowers and color transmission, and consider the overall effect of printing and the smoothness of production to determine the arrangement position of the flower net.
6. No matter what process is used, in addition to mastering the viscosity and thickness of the color paste, the amount of additives that promote dye diffusion and accelerate penetration (such as diffusion agents NNO, urea, etc.) should be larger than that of ordinary fabrics. should.
7. To reduce defects caused by the fluff of velvet fabrics during printing, such as slurry drag, net blocking, etc., it is better to pressurize the white net in front of the flower net. The number of white nets to add depends on the situation at the time. It is not advisable to use light or heavy sizing on pre-press fabrics. AASDFDNHGCXE
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