There are a variety of different types of film coating equipment in Beichao, common ones include wire Bar Coaters, scraper preparers, metering rods, color development wheels, putty scraper coaters, etc. There are many types, but the applications are all coating equipment. Therefore, for new users, when choosing coating equipment, sometimes it is not clear how to choose these types of equipment, and where are the more targeted applications? ? This article will explain these devices from four dimensions: type, application, selection method, advantages and disadvantages.
Wire Bar Coater
Wire Bar Coater is a very common consumable instrument in the field of experimental coating film, covering more than 50 different segments of the chemical industry. The wire Bar Coater quantitatively controls the thickness of the film by winding steel wires of different diameters or extruding grooves of different sizes on a smooth stainless steel rod.
There are several different types of wire Bar Coaters. Wire-wrapped, extruded, smooth rods. Among them, the wire winding type and the extrusion type can be used interchangeably under the same film thickness, but due to the different processes, the extrusion type will be a little more than the wire winding type in terms of coating amount, which can basically be ignored. The smooth bar does not have the function of scraping a certain amount of film thickness, but is simply used to control the amount of coating.
The advantage of the wire rod is that it can scrape and coat high-precision ultra-thin film, which can be as thin as 1.5 μm, and the accuracy can reach 0.1 μm, but for thick coating, it can only reach a film thickness of about 210; and its structure is linear, So it is especially suitable for multi-layer coating. However, its disadvantage is also due to the structure of the wire rod, the surface is threaded and is not suitable for samples with high viscosity or large particles , which is prone to scratches.
In terms of application, the wire Bar Coater is suitable for ultra-thin films, low-viscosity sample scraping and multi-layer coating experiments, and is especially widely used in the new material industry.
The selection of the wire Bar Coater is also relatively simple. Mainly select from the dimensions of surface technology, coating film thickness, and coating film width.
If it is the first time to choose a coating instrument, you can consult the professional technology of Beichao to assist you in professional selection.
Spatula Preparer
The scraper Applicator is a block or I-shaped coating film Applicator. It is designed to directly make grooves on the steel block to control the thickness of the coating film. Therefore, the scraper Applicator is also relatively heavy. It will be bigger.
There are several types of scraper preparers: single-sided, double-sided, four-sided and adjustable. The first three types are mainly different in the number of coating surfaces, but they all have a fixed coating thickness, and the coating thickness can reach 2000μm. The adjustable scraper Applicator, as the name suggests, is a Applicator that can adjust the thickness of the coating film. The thickness of the coating film can be adjusted to 3500 μm, but the precision of the coating film is not as high as that of the fixed type.
The advantage of the scraper preparer is that its scraping surface is flat, so it can be used for scraping high-viscosity samples and samples with large particles, and it is suitable for thick coating films. Can reach 2mm. However, it is not suitable for coating thin films, the thinnest can only be 15 μm, and the precision is not as high as that of wire Bar Coaters. And not suitable for multi-layer coating.
The selection of the Wet Film Applicator is also very simple. Choose a single-sided, double-sided or multi-sided applicator considering the number of film thicknesses to be prepared, as well as the width and thickness of the coating film.
The films prepared by the above preparer and wire rod are often used for film scraping, performance testing, colorimetric and color matching, etc.
color wheel
The color development wheel is another kind of film coating equipment that is different from wire rods and scrapers. It is an ink manual proofing tool composed of handles, anilox rollers and rubber rollers. The effect of proofing thickness is controlled by the number of lines on the anilox roller accessories. General experimental research on new materials is relatively rare, and it is more used for ink proofing, simulating the proofing effect of production equipment, and is a required tool for the production of gravure ink or aniline ink.
The selection of the color development wheel is mainly to select anilox rollers with different line counts for proofing according to the experimental requirements. Selection is very simple.
putty scraper
The putty scraper , also known as the coating film frame, is more used for building putty coating films or thick paint coating films to test the performance of the coating film . The putty scraper is composed of three parts: the bottom plate, the film frame and the scraper, and only has three optional thicknesses: 1±0.05, 0.7±0.035, and 0.5±0.03.
Putty scraper applicator scraping substrates are mainly metal substrates such as tinplate, aluminum plate, steel plate, etc., not suitable for film, paper, etc.
metering rod
The metering rod is not an experimental coating instrument, but a custom metering rod for production. Its structural principle is the same as that of the experimental wire rod coater, and the control range of film thickness is also the same as that of the experimental wire rod coater.
In terms of application, the metering wire rod is a production rod, which is a customized production line rod used to control the flow rate and maintain the uniformity of the coating in the production machinery and equipment such as paper and film.
Since the length of the metering wire rod is generally one meter or more, in the selection, more attention should be paid to the linearity of the rod. If the rod with poor workmanship is not straight enough, it will inevitably affect the coating effect. In addition, the metering rod used on the production coater needs to be scraped faster and more frequently, so it wears faster than the experimental wire rod, so there are two options of chrome plating or no chrome plating, chrome plating can improve the wear resistance of the rod and corrosion resistance.
The above are the common coating equipment accessories. If you don’t understand something during the selection process, you can further communicate with Beichao Technology. After all, in the process of experimental testing, with the diversification and personalization of product applications, there are various thorny problems in the selection of coating equipment, which increases the difficulty of selection to a certain extent.
