Water transfer printing process

In daily life, there are many products related to water standards, such as: mobile phone shells, football, helmets, ceramics, toys, cups, golf clubs, etc., all kinds of uneven, difficult to print objects can use water transfer.
First, the environment and the requirement for water transfer before printing require the surface of the object to be clean, dust-free, free of debris, and resilient. In manual printing, it is very important to do a good job of workshop hygiene. After cleaning a large area of ​​health, the small dead ends must be cleaned up. First wipe the inside and outside of the machine with the wet cloth, clean the printing equipment and the work bench, and then wipe the floor thoroughly with a mop cloth. Conditions can be used to clean the drying rack with a high-pressure water gun. Into the workshop, to replace the special clean slippers, clothing zipper pull, wear a work cap to prevent hair falling off attached to the product.
Second, the characteristics of water transfer paper Because the water transfer paper is wood paper, it is very easy to expand and contract, it will scale with the temperature and humidity irregularly, directly affect the color, the general procurement of the sheet are moisture-proof packaging, demolition After opening, the degree of retractability is very large. Therefore, before printing, we must put the cut-size paper on a drying rack and let it dry naturally for 7 to 8 hours. Under normal circumstances, the paper is well dried in the evening and can be used on the next morning as soon as it goes to work. It does not delay the production process. At this time, the paper has a smaller expansion and contraction rate under the temperature and humidity of the workshop, which facilitates overprinting. General professional water standard workshops or home-style workshops should be equipped with air-conditioning, doors and windows sealed to prevent dust from falling into. In a production plant with a thermostat, the temperature can be controlled at 25°C and the humidity can be maintained between 65 and 70°.
Third, the application of printing and ink water standard ink is generally a special ink for water mark, a batch of products is best to use the same brand of ink, additives, thinners, glue, in order to avoid a chemical reaction. Water transfer printing inks are generally available at suppliers everywhere. When printing, use the 200-mesh screen to print the white background first. If there is no special request from the customer, the taboo will be whitened. Since the paper may have slight expansion and contraction, after the white is added, the white background becomes larger, and the back color is difficult to cover the white background. , color registration is not allowed. For products with whitened colors, when using a manuscript to create a film, the white background should be as much as 0.5~1mm less than usual. After adding white, just like the background color without white, the overprint can be made accurately. When printing the first color (white), first print a few angulations (crosshairs) to facilitate the second color overprint, and later need to completely seal off extra patterns such as the needle crosshair, leaving only the product Needed pattern. Why? Because the printed water transfer mark must be placed in the water when it is pasted on the object. The top film is separated from the bottom paper. After separation, the small crosshairs will fall into the water at the same time. The crosshair will follow. Water floats on the desired product and affects operations. After sealing off, there is no concern and it is convenient. After printing one color, in order to prevent dust from inhaling, we can use a large newspaper to enclose the circumference and the top, and sprinkle some clean water on the ground for a period of time to prevent personnel from moving around and drive the dust to fall on the printed product. In the drying process of each color, the only drying method is natural drying, which must not be assisted by fans, drying tunnels, dehumidifiers, etc. The printed paper will become irregularly stretched under the influence of external forces, waiting for you is the price of money.
4. After the glue is naturally dried in all colors, it can be prepared for glue. Covering glue is very important. It directly determines the quality of a product, so it should pay attention to dust and hair when it is covered. Really clean and better, otherwise the scrap rate will be high, and at the same time pay attention to thinner and less hardworking. When using glue, 80 mesh screen can be used. In the application of sensitized adhesive, do first scrape twice on the front and back of the screen, and put it in an oven with a humidity of 40° or less. After baking, coat the front and back sides twice. The sensitized adhesive is thicker and the glue is more Saturated, strong three-dimensional. If the area is large, the object is irregular, and once the plastic is covered, it is far from thick enough, and it will not reach the operational requirements. When it is attached, it will be broken and the edges will be curled around. Finally choose to cover the glue twice, the glue is a little thicker, the time is more convenient when sticking, and the waste products are also reduced. After covering the glue, be sure to naturally dry for more than 8 hours before you can isolate the paper.