Common Problems and Solutions about Heat Transfer Machine

Some technical problems are often encountered when using inkjet thermal sublimation transfer paper for transfer. The following describes the reasons and proposes solutions based on the problems reflected.

Common problems:

• After the pad material (cotton, sponge, cardboard, etc.) under the flat heat transfer machine absorbs the moisture of the ink during the transfer process, it will cause too much water vapor during the transfer, resulting in the pattern being transferred to the cloth. The color fades or there is local aerosol or water streak interference, so before and during the transfer process, the situation can be improved by evaporating the moisture on the lining cotton by regularly pressing a few times before and during the transfer. The dry pad material should be replaced in time.

• The printed pattern and the fabric to be transferred should not be affected by moisture as much as possible, otherwise, during the transfer, especially the roller press will easily soften the paper and wrinkle, and streaks will appear on the fabric. In addition, the transfer rate will become lower, the pattern color will not be bright, and the outline of the pattern will be melted in severe cases. There will be color difference in the color contrast between the dry transfer and the wet transfer cloth, and the more severe the moisture, the more serious the situation will be. Due to the above factors, the printed paper (to be transferred) and cloth should be placed in a dry room, and the humidity should be controlled below 60%.

• When the Kangren paper is transferred under the flatbed press, sometimes ghosting will occur. The reason is: the Kangren paper, like the imported paper, is relatively flat during thermal transfer, and will not bend immediately when heated under the press, and the paper and fabric can be flattened. At the moment when the heat press plate is lifted during thermal transfer, the paper will be adsorbed on the upper platen together with the fabric, and then fall. At this time, the high-temperature transfer paper will fall on the cloth, which will cause a shift secondary transfer, forming a ghost with very light colors.

In order not to produce ghosting, you can take the following solutions:

• Decrease the rising speed. We can adjust the speed control valve (throttle valve or throttle valve) of the cylinder (or hydraulic cylinder) on the flat heat transfer press, and close the valve that controls the lift of the platen to a smaller size, so that the speed of the platen lift becomes slower, In this way, when the platen is lifted, the paper and the fabric are not easily sucked up together, which can avoid the problem of ghosting caused by the secondary transfer caused by falling off.

• The four corners are dipped in water. If the transfer paper is smaller than the fabric, you can apply a little water (a small point, ≤0.5 square centimeters) to the 4 corners of the transfer paper without the printed pattern, and then cover it on the fabric for transfer. Adhesion, after transfer, will not be misaligned with the fabric to produce the ghost of the second transfer. After transfer, if there is scorched yellow on the spot of water on the fabric, it can be wiped off with clean water.

• Cover method. If the transfer paper is larger than the fabric and can cover the surface of the fabric, then the paper and the 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 cut off. The electrostatic effect on the surface will not be sucked up and dropped off for the second transfer.

• Use special adhesive transfer paper. The best way to avoid ghosting is to use special sticky transfer paper. The sticky transfer paper will stick to the fabric during transfer, so that no matter how the paper and the fabric are sucked up and dropped, the paper and the fabric are always attached. Taken together, the possibility of ghosting caused by shifting is eliminated, and the use of sticky paper can greatly improve the convenience of operation and the yield of mass production.

Conclusion

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