A method for manually spraying film thickness to control the discrete rate and ultra thick rate

As long as it is a manual gun, the uniformity of the film thickness cannot be guaranteed unless the worker is an old worker, a skilled worker

If you want to ensure that the film is uniform, you have to use automatic grabbing

If you say that the structure is special, it is estimated that the workpiece has a dead angle, and it does not matter if the fixed-point nozzle is automatically sprayed or the workpiece itself rotates, and the effect is not bad

1.The low point rate does not meet the requirements of the specification;

2.In order to reduce the low point, it often results in ultra-thickness, but it brings a high cost increase, and the cost impact is significant because of the large production.

The above is the question you raised, and the above problems occur in manual spraying, which means that the technical level and work experience of the operator cannot meet the requirements. Paint technicians above level 7 can quickly adjust to meet the required level during operation. It is to adjust the process plan according to the physical shape of the product, which can be used to fill the paint, control the flow, or spray twice.

However, I personally think that the fundamental solution is to find skilled operators, and the process implementers I am responsible for are all level 8 technicians, so the situation you mentioned has basically not been encountered.

I don't know what kind of workpiece you have, but the general dead end is basically pre-coated manually first, and the large surface is automated. Some dead corner paint film table can not be checked, to ensure that the bottom is not exposed, on the line, the thickness of the paint film is controlled at 90% of the total paint film, our container industry is like this. The key is to make a good record of savings, to optimize, with a minimum of paint to ensure the quality of the product.

The general single film thickness of the metal is 15 18um, and the secondary film thickness is not more than 35um, and the specific requirements should be according to the customer's standard.

1.The thickness range of hardware paint is 20um 25um, and the thickness range of secondary spraying is 40um 50um

The maximum thickness should not exceed 60 um

2.The thickness range of hardware powder is 50um 70um for the first spraying, and the thickness range for the second spraying is 100um and 130um

The maximum thickness should not exceed 160 um

The above is for reference, and the actual thickness is also related to the grinding treatment before respraying.

The primer should be 30 to 40 micro, and the topcoat to be 15 to 25 micro. Powder spraying should be at 40 to 60 micro.

It depends on the specifics of your home.

1.The thickness range of hardware paint is 20um 25um, and the thickness range of secondary spraying is 40um 50um

The maximum thickness should not exceed 60 um

2.The thickness range of hardware powder is 50um 70um for the first spraying, and the thickness range for the second spraying is 100um and 130um

The maximum thickness should not exceed 160 um

The above is for reference, and the actual thickness is also related to the grinding treatment before respraying.

Powder coating spraying is not very clear, general paint spraying, there is also a difference, hardware requirements are high need to spray epoxy primer, film thickness in 15-20 microns. Then the topcoat is applied 2-3 times, and the film thickness reaches 80-120 microns. Finally, do not exceed 180 microns or 200 microns.

Paint spraying is generally 15-20um, powder spraying is 60-80um, depending on the requirements of the workpiece.

In fact, I personally believe that this paint blackening phenomenon is unlikely to be the cause of the airbrush. It is very likely that it is the cause of the paint, it is recommended that you find the reason from the coating, and there is also a possibility that the film thickness sprayed by the manual spray gun and the electrostatic spray gun is different, generally speaking, the film of the electrostatic gun is thicker than that of the manual gun, so the color will be relatively darker. It's just a personal point of view, and I hope to help you with your travel cavity.

The new paint sprayed out is relatively new, it must be different from the current one, maybe it will be fine after a while,

Hello, the general paint is not factory-based professional design and stool removal skilled workers are difficult to achieve a metallic sense if they are sprayed, and there is a texture paint that can meet your requirements.

Try spraying the varnish again.

The amount of paint used for steel structures, the first thing you need to know is the painted area of the steel structure. Secondly, the matching scheme of the selected paint, the thickness of the dry film of each paint, the construction method, the type of substrate, etc. Then you can calculate the amount of paint required according to the Lifan paint calculation software.

If you don't have an idea of the thickness of the film to be coated, you can generally choose 40 m.

Below, taking the common outdoor steel structure paint matching scheme: epoxy zinc-rich primer + epoxy micaceous iron intermediate paint + acrylic polyurethane topcoat as an example, the specific steps of paint calculation are introduced

1. Select the proposed paint in turn, epoxy zinc-rich primer, epoxy micaceous iron intermediate paint, acrylic polyurethane topcoat, 2. The total area belongs to 1, representing 1 square meter.

3. Dry film thickness: Enter the thickness of the coating dry film designed by the paint supporting scheme.

4. The calculation result is automatically displayed.

Complex of steel structure paint.

The amount needs to be made to know the painting area of the steel structure, the supporting scheme of the selected paint, the dry film thickness of each paint construction method, the type of financial management, etc., and then you can calculate the amount of paint you need to use according to the colorful paint calculation software, if you have no concept of the thickness of the film that needs to be painted, you can generally choose 40um.

Use a template, the middle width is less than 20 mm, a few centimeters away from the steel belt, (self-controlled), and the natural thickness of the atomized edge of the paint when spraying is less.

Look at your problem to know that it is a layman, there is no calculation of the weight of the paint dry film, if the owner will torture the construction unit to death, there are many factors affecting the amount of paint, generally according to the spraying or brushing area, paint film plus loss (approximate calculation.

The thickness of the paint film is generally calculated, and the weight is rarely calculated, and the construction thickness can be detected according to the thickness of the paint film required by the design drawings. As for the relationship between thickness and weight, various paints should be different, or ask the manufacturer, such as a barrel of paint coating area.

The first thing to do is to know what the solids content of your lacquer is. Take some material and put it in the oven, weigh it to know how much volatilization. The rest is solid. For example, if you have a topcoat with a solid content of 70% per ton, it is theoretically a tonne after drying. But there is always a loss.

This cannot be calculated by weight, which is not realistic. The weight of the paint is too small. This can be calculated based on the actual number of brushing passes. Thinners are also diluted.

Hongdan anti-rust paint dosage per pass: kg per ton Supporting thinner: 30 kg.

Medium ash anti-rust paint dosage per pass: kg per ton Supporting thinner: 30 kg.

Medium gray topcoat dosage per pass: 8 kg per ton Supporting thinner: kg.

The above is the old quota regulation, and now the actual dosage is 40%.

It's about 85% of the paint, anyway, the thinner only plays a dilution role, and finally all of it is volatilized.