What is the reason for the difference in the actual value of the wire rod Spreader theory?

When answering this question, let’s first talk about a reality:

When coating wire rods, users often face a difficult problem: wire rods are generally selected according to the wet film, but users often need the corresponding dry film. Many users often ask when buying wire rod coaters in Nanbeichao Mall: I want to coat dry film in xxx microns, please help me choose.What is the reason for the difference between the theoretical and actual values ​​of wire bar coating?  Picture 1


So, what is dry film about? We understand that the purpose of the user to prepare the dry film coating is to measure the physical or mechanical properties of the coating. The dry film is transformed from the wet film. In most cases, dry film = wet film * solids%, therefore, the first reason why the theoretical and actual values ​​of wire bar coating are not the same may be the wrong choice of wet film thickness line due to the wrong solid content. Rod applicators, the foundations have collapsed, and there is no way to talk about how tall the building will be.


Another reason is that the wire bar coater used to prepare the film layer, the high-precision wire bar coater, marked 10um is 10um, not 20 or even 30 microns, of course, the seemingly simple principle of the coating rod, some manufacturers The scale can be marked up to 0.1um, but some manufacturers can’t. Especially when it comes to ultra-thin coating, there is still a big gap between domestic wire bar coater manufacturers and imported ones. This may be the second reason why the coating theory is not the same as the actual


A third possible reason is to prepare the coated platform. In the North and South Tide, we call it an embossing bed, which is made of hard polyester board, foam layer and rubber cushion, which can reduce the problems caused by uneven pressure on the hands while maintaining stability. The author has seen a customer cut a rectangular wooden board directly, and then put the hiding power paper on it to scrape the sample, and the coating rod is imported high-end product. I want to say that the coating obtained in this way is really satisfactory. ? This is like buying a Mercedes-Benz, but driving on a bumpy road. Can the experience purpose of Mercedes-Benz be achieved?


In addition, the wire bar coater is manually operated after all. If a coating of less than 10um is prepared, problems such as uneven speed, uneven left and right pressure, and uneven spread of ink volume will bring about the so-called theoretical follow-up at once. The reality is different.


Finally, if you have tried all the above reasons and it is still the same, I suggest you buy an automatic coating machine to reduce the factors caused by manual operation. If this is still the case, it must be a wrong calculation of the solid content.


NBCHAO E-shop
Guess you like it
Relevant knowledge