How Is Reflective Heat Transfer Film Made

1. Preparation of raw materials

Prepare The Base

There are many types of reflective heat transfer film carriers, among which PET is widely used, which has the characteristics of stable size, uniform tension, high temperature resistance, and good peeling performance. Especially in the reproduction of tone originals, it has its obvious advantages. At the same time, check the flatness of the film, whether there are ribs, ruffles, etc. that do not meet the quality requirements.

Prepare A Separating Agent

The mold release agent is a low-viscosity transparent resin with mold release, film-forming properties and adhesion. Because the solvent in the release agent is volatile, care should be taken to control the viscosity when coating, that is, to control the solid content of the release agent, which is generally controlled at about 23%. When the solid content is lower than 19%, the heat transfer effect after coating is not ideal. In addition, pay attention to the light transmittance of the release agent, otherwise it will affect the printing effect.

Ink Ready

Heat transfer printing ink belongs to gravure printing ink, and its drying mainly depends on the volatilization of solvent. After the base film is determined, the base film can be selected according to the use of the printed product, the properties of the printed material or the requirements of the building board. Check ink fineness, viscosity, hue, tinting strength and other indicators to see if it fully meets the printing quality requirements.

Glue Mixing Process

The adhesive for heat transfer is hot melt adhesive, which is a colorless transparent or light yellow viscous liquid. After the coating film dries, the film is transparent. On the surface coated with release agent and ink, it has excellent composite fastness and flexibility, abrasion resistance, water resistance, acid and alkali resistance and other medium resistance and weather resistance.Yeshiming is the best reflective heat transfer film manufacturer, and it has achieved standards and professionalism in the preparation of raw materials and the production process.

2. Matters Needing Attention In The Production And Coating of Heat Transfer Film

Put Paper

The base film is placed in the middle of the embossing roller, and then enters the middle of the embossing roller through the constant tension traction roller. Adjust the pressing force according to the diameter of the roller, and set different drying temperatures according to different coating materials.

Coating Release Agent

Mix the release agent evenly, pour it into the coating tank, stir evenly, turn on the gravure coating, after coating, put the substrate film on the drying device to dry. The drying temperature can be set according to the temperature required by the release agent or the data provided by the manufacturer. The curing time of the release agent on the surface of the substrate film is short, but in order to make the transfer effect better, the solvent must be completely evaporated before preparing the coating ink, so that the drying temperature can be appropriately increased, or 2~4 color groups can be used for drying . The thickness of the peeling layer should be controlled at about 5 microns.
paint ink.

Heat transfer films are usually printed with gravure. Pass the bottom film roller coated with release agent between the embossing roller and the embossing roller, rotate the embossing roller in the ink box, print the image and text, and then dry the ink layer with a drying device to speed up the drying speed. The drying temperature of heat transfer printing ink should be selected according to its solvent. If the solvent is toluene, the drying temperature can be appropriately lowered; if the ink drying speed is slow, the drying temperature should be increased.

At the same time, note that the printing order of the heat transfer film is opposite to that of the general printing, that is, print the transparent ink first, then print the opaque ink, and finally print the white ink as needed. Its function is to cover the color of the substrate itself, so as not to affect the level and tone of the picture on the colored object.

Cover With Adhesive

In order to prevent the image of the printed layer from being damaged, the layer is completely dried before bonding. Finally, it is coated on a gravure printing machine, and then the coated base film is dried. The drying temperature is determined according to different base films, and is finally completed by a winding device.

Winding and Cutting In Two Steps

When winding, the expansion shaft is the same as the paper output shaft, the traction force is controlled by the winding motor, and the tension is usually the same as the paper output part, so that the machine can work normally. When a scroll is complete, it can be cut and replaced with another. Heat transfer film rolls are cut into finished products of different widths as required. In order to save costs, heat transfer graphics are usually evenly distributed on a printing plate according to the size, and cut when used. And it is important that the cutting equipment has an automatic deviation correction device, otherwise it will affect the overall effect of the picture.

When printing, the release agent, ink and adhesive should be replenished at any time, and the rolled film should be placed on the paper feeding mechanism in time to ensure continuous printing. At the same time, the coating of each material of the heat transfer film should be sampled regularly, and defects such as white spots, stains, and streaks should not be found, so as to eliminate printing failures in time.

Yeshiming has a professional best reflective heat transfer vinyl factory and professional production and testing equipment. Welcome friends who are interested to visit China.