1. Padding materials (cotton, sponge, cardboard, etc.) under the flat heat transfer machine will absorb ink moisture during the transfer process, resulting in excessive water vapor during the transfer process, causing the color of the pattern on the transfer cloth to fade or Cause local aerosol or water ripple interference. Therefore, before and during the transfer process, regular hot pressing can be used to evaporate the moisture on the pad cotton cloth to improve this situation. If conditions permit, the dry lining material should be replaced in time.
2. The printed pattern and the fabric to be transferred should not be damp as much as possible, otherwise the paper will become soft and wrinkled during the transfer process, especially the roller press, and stripes will appear on the fabric. In addition, the transfer rate will be lower, the color of the pattern will be less vivid, and the edges of the pattern outline will melt away in severe cases. The color contrast of dry transfer printing and wet transfer printing will have a color difference, the worse the wet, the more serious the situation.
Due to the above factors, the printed paper (to be transferred) and fabric should be placed in a dry room, and the humidity should be controlled below 60%.
3. Sometimes, the transfer paper will produce double images when it is transferred under the flatbed printing machine. The reason is that the transfer paper is flat during thermal transfer and will not be bent immediately when heated under pressure so that the paper and cloth can be flattened. During the thermal transfer, the hot platen is lifted, and the paper will be adsorbed on the upper platen together with the fabric, and then fall. At this time, when the high-temperature transfer paper falls on the cloth, it will shift the secondary transfer, forming a very light ghost.
To avoid ghosting, the following solutions can be taken:
①Reduce the ascent speed. We can adjust the speed control valve (throttle valve or throttle valve) of the cylinder (or hydraulic cylinder) on the flat heat transfer machine and turn off the valve that controls the lifting of the pressure plate to slow down the lifting speed of the pressure plate so that the pressure plate rises and falls When paper and cloth are not easily sucked together, the problem of ghosting caused by secondary transfer is avoided.
②The four corners are immersed in water. If the transfer paper is smaller than the fabric, you can use a small amount of water (a small point, ≤ 0.5 square centimeters), and then cover it on the fabric for transfer printing. When the transfer paper is immersed in water, it will bond with the fabric. After transfer, it will not be misaligned with the fabric, resulting in a double image with the secondary transfer. If there is burnt yellow on the fabric after the transfer, wipe it with clean water.
③ Covering method. If the sublimation heat transfer paper is larger than the fabric and can cover the surface of the fabric, the paper and fabric will not be attracted by the heat press plate. This is because the physical reason for being attracted is the electrostatic effect of the fabric. When the paper covers the fabric and cuts off the electrostatic effect of the fabric, it will not be sucked up and down due to secondary transfer.
④Use special adhesive transfer paper. To avoid ghost images, the best way is to use special adhesive transfer paper. During the transfer process, the adhesive transfer paper will be pasted with the fabric, so that no matter how the paper and fabric are sucked up and down, the paper and fabric will always stick together, eliminating the possibility of ghosting due to displacement. The use of adhesive tape can greatly improve the convenience of operation and the pass rate of mass production.