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Detailed analysis of water transfer printing process
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Detailed analysis of water transfer printing process

Author: Site Editor     Publish Time: 2021-04-26      Origin: Site

Detailed analysis of water transfer printing process

Water coating process

(1) Film activation

Spread the water-coated transfer film flat on the water surface of the transfer water tank, with the graphic layer facing up, to keep the water in the water tank clean and basically in a neutral state, spray evenly on the graphic surface with an activator to make the graphic The layer is activated and is easily separated from the carrier film. The activator is an organic mixed solvent dominated by aromatic hydrocarbons, which can quickly dissolve and destroy polyvinyl alcohol, but will not damage the graphic layer, leaving the graphic in a free state. The principle of film activation is shown in the figure below.

 

(2)Water coating transfer process

The article that needs water transfer is gradually approached to the water transfer film along its outline. The image and text layer will slowly transfer to the product surface under the action of water pressure, due to the inherent adhesion of the ink layer and the printing material or special coating. Create adhesion. During the transfer process, the lamination speed of the substrate and the water-coated film should be kept uniform to avoid wrinkles of the film and unsightly pictures and texts. In principle, you should ensure that the graphics and text are properly stretched and try to avoid overlaps, especially the joints. Too much overlap will give people a cluttered feeling. The more complex the product, the higher the requirements for operation.

Water temperature is an important parameter that affects the quality of the transfer. Too low water temperature may reduce the solubility of the substrate film; too high water temperature can easily cause damage to graphics and text, causing graphics and text to be deformed. The transfer water tank can adopt an automatic temperature control device to control the water temperature in a stable range. For large-scale workpieces with a relatively simple and uniform shape, special water transfer equipment can also be used instead of manual operations, such as cylindrical workpieces, which can be fixed on a rotating shaft and rotate on the surface of the film to transfer the image and text layer. The water coating transfer process is shown in the figure.

 

The following steps should be carried out after the transfer and covering of the graphics and text:

 Organize

  Take the workpiece out of the sink, remove the remaining film, and then wash off the floating layer that is not fixed on the surface of the product with clean water. Note that the water pressure should not be too high, otherwise it will easily damage the transferred graphics.

 

 Dry

Remove the moisture on the surface of the product to facilitate the thorough drying of the transfer ink layer; in order to increase the adhesion fastness, it can be dried with a hair dryer, or the product can be dried in a drying box. The drying temperature of plastic products should not be too high, about 50-60 , too high temperature will easily deform the substrate; the drying temperature of metal, glass, ceramics and other materials can be appropriately increased.

 

Spray protective paint

In order to enhance the resistance of the graphic layer to the environment, it is necessary to spray paint on the surface. Spray paint can use solvent-based varnish, which can be dried naturally or by heating after spraying; UV varnish can also be used, which is cured and dried by ultraviolet rays. In contrast, UV curing is more suitable for environmental protection requirements.

 

Solvent-based varnish needs to be mixed with the supporting hardener. The water transfer spray varnish sold by Dongguan Bomei is a varnish with polyurethane resin as the binder. It must be used with PU hardener; the thickness of the coating can be Add appropriate amount of diluent to improve the viscosity of varnish to control; be careful not to dry in an oven. For different printing materials, spray varnishes are also divided into three types, namely varnish suitable for plastic materials, varnish suitable for flexible materials and varnish suitable for non-absorbent materials such as metal and glass.


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