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Technical problems often encountered in printing ceramic heating elements

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Issuing time:2018-12-04 10:35Author:小宇

The heating carrier of the electronic cigarette has undergone the evolution of the cotton core and the heating wire to the ceramic heating element. At present, the ceramic heating element is widely used as the mainstream atomizing core technology. A thick film heating circuit is printed on a core process in the manufacture of ceramic heating elements.

What is thick film printing?

Thick film printing is to print the heat-generating paste on a ceramic substrate according to a certain thickness and shape. It is one of the key manufacturing processes of the new electronic cigarette ceramic heating element.

Thick film printing process


                

                  Stretch net                                              晒版                                                   显影

          IMG_20181130_132521.jpg     IMG_20181130_132835.jpg

         印刷                                                 烧结                                              成品                                             成品



Effect of printing pressure on film thickness

The higher printing pressure (the pressure applied to the squeegee) thins the film thickness (the thickness of the printing ink), which is likely that the pressed pressure scrapes off the slurry extruded from the screen. We also got the result, our experiment used 80 degrees of scraping hardness.

Picture1:Film thickness change of printing pressure

However, the result is not always the case. Non-linear changes in film thickness and printing pressure: In experiments with a squeegee hardness of 60 degrees, the film thickness and printing pressure are as follows:

Picture2:Film thickness change of printing pressure -2

Unlike the above chart, the film thickness is not linearly thinned, but instead it becomes thicker at 0.25 MPa. This is not only because the increased printing pressure causes the pressure to leak from the deflection of the squeegee caused by the printing pressure itself. The deflection of the squeegee reduces the actual angle of the squeegee and squeezes more of the slurry.

Picture 3:When Scraper working

The higher the hardness of the squeegee, the greater the tendency of the squeegee to bend, and the lower the hardness, the smaller the tendency of the squeegee to bend. However, it is noted that if the hardness is extremely high, it is difficult to extrude the slurry, and there are other adverse effects. In addition, the hardness of the blade is slightly different depending on the manufacturer or material, and the error is plus or minus five.


The printing pressure generated by the actuator also often varies from actuator to actuator.


So, under such unstable conditions, how can we get a fixed film thickness? Let's superimpose the above chart on the chart below.


Picure 4:Film thickness change of the blade hardness

As can be seen from this chart, 7.5 μm is the standard film thickness, and in the case of our company's JY-IC-150B thick film printing equipment, the paste and mesh used in this series of experiments are 0.15 to 0.25 mpa. The printing pressure between them brings the most stable quality.

The experiment was carried out by Jianyu Screen Printing, and the results may vary depending on the slurry, screen, blade speed, push, and gap.


Equipment introduction

JY-IC-200A-CCD.jpg


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