2. Photoluminescent printing.
1 Photoluminescent printing features.
Photoluminescent printing uses a special coating paste containing photoluminescent solids and other additives. After being irradiated with light, the photoluminescent solids can emit light in the dark, and can maintain a certain time (about 20 minutes), and then have a luminescent effect after light irradiation. The photoluminescent luminous device does not contain radioactive substances and is harmless to the human body.
Photoluminescent printing is similar to general printing. At present, domestic luminous printing paste has three colors: light yellow, green and orange.
Photoluminescent printing materials can be printed on various kinds of fabrics. The printing on cotton fabrics and polyester/cotton fabrics is excellent in both fastness to washing and fastness to rubbing.
Photoluminescent printing has a long light life. It usually has a luminescent effect within three years after fabric printing.
The use of photoluminescent prints allows fabrics to display crystal colorful patterns in the dark, giving the fabric a dynamic effect.
2 The use of photoluminescent printing.
Its decorative effect on the fabric is very significant, especially children's clothing printed with a variety of animal motifs, in the dark to see the sparkling, vivid patterns do not have some fun.
Photoluminescent printing also has its practical effects, such as: military, railway, mining areas, theaters and other workers on the clothing logo, using photoluminescent printing in the dark to facilitate identification.
Photoluminescent printing should also be combined with other special printing to receive better results. Pure light-emitting printing shows no special effect in the light, even if it does not seem to be normal printing, these should be considered in the design of fabric products.
3 Photoluminescent printing equipment and materials.
This printing can use ordinary printing equipment and materials, no special requirements.
4 Photoluminescent printing process and precautions.
a. Photoluminescent printing process.
It can be operated in accordance with the requirements of the luminous pulp product specification, and the process conditions are similar to ordinary printing. After the end of printing, it is necessary to perform a heat fixation treatment at 160 to 185°C for 2 minutes.
b. Handling precautions.
In order to ensure that the fabric has a good luminescence effect, no other substances can be mixed in the luminous paste. In order to obtain better silk screenability, water or emulsified pulp may be added for adjustment when necessary.
In order to ensure the luminescence performance, the paste should not be overprinted on other coating pastes, and should not be covered by other coating pastes.
In order to ensure that the fabric has a good feed rate and better silk screenability, screens with a mesh size of less than 100 mesh/inch are generally preferred. In order to ensure the clearness of the pattern and the neatness of the edges, the bridging property of the plate-making photosensitive adhesive is better.
The design of fabric products should be considered from the specific needs, artistic effects, daytime and night viewing effects and other screen printing technologies. The silkscreen sequence should be printed with the last night light paste.
(to be continued)