How to control the heat transfer temperature

Printing using heat transfer not only need to control the temperature of the drying process, also need to control the temperature of the printing process. Direct measurement of temperature measurement of printing and heat transfer printing process of the maximum temperature difference is the heat transfer printing is printing and drying in a sublimation paper. At this time only needs some gel, but not too dry. Maintain accurate ink sublimation paper is an important task for temperature measurement and control. If this step isn't doing a good job, there is no guarantee that the ink transfer process of success.

Gelled ink ink layer

Drying parameters of heat transfer printing and screen printing is different from any other. Using heat transfer printing, the ink layer must reach the gel state, but not completely dry, the next step is to better able to transfer to the substrate. In general, the temperature conditions are printed using plastic transfer ink is 100-120 ℃, to get correct gel ink layer.

If ink layer could not fully gelatinized, will remain tacky state. This may lead to complete the sublimation paper and transfer printing stack bond mutual together. If the transfer printing process temperature is not enough, the plasticizer in the ink layer could not be properly absorbed the ink PVC resin, may also cause ink sticky.

On the other hand, the high temperature will lead to unsatisfactory results. That is to say, high temperature will cause the printing ink layer of plastic agent more absorption, transfer to a woven, ability will reduce the ink to soften and bonded to the silk on the. The best method for plastic ink gel sublimation paper is slowly heating the ink layer. Try to complete the transfer work quickly would run counter to one's desire. For example, a printer to flash unit as online heater, used in printing ink layer of gel on the sublimation paper, the completion of the sublimation paper printing piled as waste. Transfer ink layer to achieve the correct gel state, it is best to use a light heating dryer, so that the ink layer after longer time to gel state. Recommendations in the dryer for 45-60 seconds to dry, rather than high temperature rapid drying of 5-7 seconds.

Temperature measurement

When the sublimation paper is in the dryer, you can use the temperature or the more expensive price of the annular detector to measure the temperature. From the use experience, thermistor temperature effect is good, the use is convenient. Annular detector capable of measuring more accurate value is given, but when it enters the drying chamber to enter the block product. In addition, you can also use the non-contact thermometer, but it only shows the dryer temperature readout temperature time, and cannot be displayed when the sublimation paper after temperature rise to high end.

In order to output measurement transfer radiation dryer is much, the temperature can be given about the temperature value, the "about" of this kind of measurement is enough, because nothing can give absolute temperature.

Of course, that heat transfer have been testing the most authoritative fully dry is practice, when you put the sublimation paper image transfer printed to a woven, as long as it is able to complete the transfer task, it is fully dry. To further test the drying parameters are required, is to wash after transfer experiment on silk, if able to wash, to further prove the correctness of the dry.

Sublimation paper storage

Control of storage environment temperature is another very important problem, especially for image printing is even more so. Because of the influence of the sublimation paper is susceptible to changes in temperature and humidity, in any one of these two factors appear big changes will be have a great influence on the sublimation paper color set. In order to reduce the temperature and humidity have an adverse effect on the sublimation paper, you must complete the prevention work. First of all, the best method is to use a temperature and humidity controlled the house to store, control the temperature of 24-30 ℃, humidity 30%. Under this condition, the telescopic sublimation paper can be reduced to a minimum. Secondly, you can put the sublimation paper storage into the paint bag. In order to storage conditions correct monitoring and maintaining the correct control, it's better to buy a good thermometer and hygrometer.

Transfer printing process

Suppose you after properly control the drying temperature has been transfer ink layer correct gel, then the task is to transfer the image transferred to the paper to silk. If you are printing using tools for image, we should pay attention to the following points:

1 many printing often make such mistakes, that always thinks transfer than direct screen printing is easy to complete, always want to "I just put the image 'flipping' to the silk on the line, what is so difficult?". In fact, if you do not properly control the transfer process, inferior or waste will be the emergence of a large number of. Therefore, must correctly deal with the transfer process, allows the slightest bit of sloppy.

2 transfer to get good viscosity and printing persistent need to remember the three basic parameters, these parameters are temperature, time and pressure. Any one of these three parameters of the anomaly will lead to the decline of the quality of the finished product.

3 to be able to reach the plastic transfer, temperature is 188-190 ℃. At this temperature, the printing ink sublimation paper will again softening, can transfer and consolidation in silk. If the temperature of less than at the time of transfer, the result is either not good bond, or is not easy to separate from the sublimation paper printing ink.

4 how to know the temperature meets the requirement under pressure? The best measurement technique is to use contact thermometer. In order to measure the transfer temperature, the thermometer to direct contact with the heating pressure roller.

5 contact thermometer is a measuring tool better, because it has a direct contact with the heating body, can get accurate temperature values. The tool can not only given the current temperature, but also to identify changes in temperature transfer process. Non-contact thermometer is also sometimes used to measure temperature, but it has no contact thermometer accurate. In a word, regardless of temperature measurement tool, if the temperature is abnormal, must tell transfer personnel immediately.

Conclusion

Although we made some control variable heat transfer printing process, but the actual production variables will be more. You must remember to heat transfer printing after drying and direct printing, direct printing is to achieve a complete drying, and heat transfer is necessary for gel ink to a certain degree, make it to the image can keep stable before the final printed on the transfer. Although the need for all parameters control the temperature and humidity is not heat transfer, but the use of temperature control and monitoring process will help you achieve this goal. I believe that after continuous practice, you will be able to better accomplish the task of heat transfer.