Common Transfer Problems and Solutions for Plastic Heat Transfer Machine

1. The cushion material (cotton cloth, sponge, cardboard, etc.) under the plastic bucket heat transfer machine absorbs the ink moisture during the transfer process, which will cause excessive water vapor during the transfer, resulting in the pattern being transferred to the cloth. The color becomes lighter or there is local aerosol or water streak interference, so it can be improved by evaporating the moisture on the pad cotton cloth before and during the transfer process. If possible, the situation can be improved. The dry gasket 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 transfer, especially the roller press, and stripes will appear on the transferred fabric. Moreover, the transfer rate will be lower, the color of the pattern will not be bright, and the outline of the pattern will melt when it is severe. The color contrast between dry transfer and damp transfer will have color difference. The more damp the cloth, 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. When Kangren paper is transferred under a flat press, ghosting sometimes occurs. The reason is: Kangren paper is relatively flat during thermal transfer, like imported paper, and will not be bent immediately when heated under the press. Paper and fabric can Paste flat. During the thermal transfer, the paper will be adsorbed on the upper platen together with the fabric at the moment the hot platen is lifted, and then fall down. At this time, the high-temperature transfer paper falling on the fabric will cause a shifted secondary transfer, forming a light-colored ghost.

In order to avoid ghosting, the following solutions can be taken:

① Reduce the ascent speed. We can adjust the cylinder (or hydraulic cylinder) speed control valve (throttle valve or throttle valve) on the flat heat transfer press, and turn the valve that controls the lifting of the pressure plate down a bit, so that the speed of the pressure plate lifting is slower. In this way, the paper and cloth are not easy to be sucked up together when the pressure plate is raised, so that the problem of ghosting caused by the secondary transfer can be avoided.

Take our company's flat heat transfer press (air pressure) as an example. The distance between the heat press plate and the table is 130mm. When the press plate is lifted for ≤ 2 seconds, the transfer paper and fabric (referring to the Wumei satin used for testing) will be After sucking up, adjust the intake valve to lower the pressure plate's lifting time at ≥3.50 seconds, the paper and fabric will not suck up, and there will be no ghosting. Therefore, the lifting speed of the pressure plate should be controlled at ≤ 37mm/s. If the pressure plate area is large, it is recommended to control the rising speed slower.

② Dip the four corners in water. If the transfer paper is smaller than the fabric, you can apply a little water (a small dot, ≤0.5 square centimeters) to the 4 corners of the transfer paper without printing patterns, and then cover the fabric for transfer. Adhesive, after transfer, it will not be misaligned with the fabric to cause secondary transfer ghost images. After transfer, if there is a burnt yellow color on the fabric, you can wipe it off with water.

③ Covering method. If the transfer paper is larger than the fabric and can cover the surface of the fabric, the paper and fabric will generally not be sucked up by the hot pressing plate. This is because the physical reason for being sucked up is the electrostatic effect of the fabric. When the paper covers the fabric, the fabric is blocked. The electrostatic effect on the upper part will not suck up and fall off the secondary transfer.

④ Use special adhesive transfer paper. The best way to avoid ghosting is to use special adhesive transfer paper. The adhesive transfer paper will be pasted with the fabric during transfer, so that no matter how the paper and the fabric are sucked up and down, the paper and the fabric are always attached. Together, the possibility of shifting and ghosting is eliminated, and the use of adhesive paper can greatly improve the convenience of operation and the pass rate of mass production.

Although the price of sticky transfer paper is slightly higher than that of ordinary transfer paper, it is economical and cost-effective to choose sticky transfer paper because it greatly reduces consumption and improves work efficiency.