Classification of printing and dyeing
Printing and dyeing classification From the printing process point of view, printing is printed directly on white or light-colored fabrics. Features: The printing process is simple, suitable for various dyes, and can be applied to various fabrics.
Anti-printing and dyeing, prevent dyes from staining or coloring, so as to print colorful patterns on printed and dyed fabrics. Anti-white printing: Printing paste contains chemicals that can destroy or prevent ground color dyes from being dyed. The background color of the print cannot be dyed. The printed white pattern is called anti-white printing. Anti-color printing: The printing paste does not contain dyes and anti-dying agents, and fiber dyeing and anti-dying will not occur. It is less delicate than discharge printing, but has more dye varieties.
From the printing equipment, screen printing is more commonly used as the main printing tool. The screen has a hollow pattern, the unpatterned screen is painted, and the color paste is scraped through the screen and transferred to the fabric. According to the grid shape, the size of the flat screen printing pattern and the number of colors are not limited, and the printed fabric is basically tension-free. The circumference of the rotary screen for rotary screen printing flowers is limited, and the number of flowers is limited, so the production efficiency is high.
Cylinder printing is a printing technology commonly used in the 20th century. The printing cylinder process is complex and suitable for printing large quantities of cloth. The cost of printing small batches is high, and it is gradually replaced by screen printing. High resolution pattern of debossed patterns on flower tubes.
Transfer printing dye is printed on paper and then transferred to textiles. The processing technology is short, the pattern art is rich, and it can print patterns with rich layers and realistic shapes. Accounting for 5% of printing output, inkjet printing originated from the simple printing process of inkjet printers, high-quality printing, no color restrictions, and strong production flexibility.
Light fastness: the ability of a printing dye to maintain the color of the raw material in sunlight. It is generally stipulated that each grade of sunlight has a standard sample of blue wool fabric, which is dyed to a certain concentration with a specific printing dye, called a blue standard sample. Under the specified conditions, the time required for fading to occur is roughly Gradually increasing. During the measurement process, the printed and dyed samples should be exposed to specified conditions and compared with standard samples to evaluate their print and dye fastness.
Factors affecting light fastness: dyes with different structures have different color fastnesses. The same dye has different concentrations on different fibers, and the fastness is different. Generally, high concentrations are worse than low concentrations. Environmental conditions also have an impact, such as sulfur dioxide in the atmosphere. , nitrogen dioxide, moisture content, etc.
Color fastness of weather textiles, tested without any protective measures or simulated external climate conditions, and taking into account environmental factors. Color fastness to washing refers to the color fastness of dyes to washing in soaps and other solutions. Washing color fastness includes original color fading and white fabric printing and dyeing fading: the fading of fabrics before and after soaping.