How to solve the problem of many dust spots in the spraying of plastic parts?

The dust point of plastic parts spraying mostly affects the coating quality of plastic spray paint, and the defect rate will lead to an increase in production and cost. Therefore, for the dust spot problem, the defective products can be reworked into good products by Shizukawa UV rework water rework, and there is no need to directly scrap the product, which can improve the yield and save costs.

What are the defects that UV light-curing coatings will produce during construction?

1.Dust spot: UV is a transparent liquid, after being irradiated by UV lamp, it turns from liquid to solid state, and the surface reaches hardening.

2.Pockmarks: The formation of this situation is generally that the UV system is not cleanly filtered, the volume shrinkage is too large, the wetting and spreading of the paint film is not good, and local agglomeration is formed, and there are pitting.

3.Pinholes: This condition is generally caused by the insufficient solubility of the diluent, or the viscosity is too high, and the paint film is too thick.

Depending on the UV system, there are various undesirable solutions

1.The spraying environment is an objective factor, and it is best to use the dust-free level.

2.Dust removal of materials, and adjust the compatibility and solubility of the formula to achieve a balance of wetting, leveling and defoaming.

3.The above two points are the solution for those who have not yet formed a defect. For dust spots, pitting, pinholes, etc., UV rework water is a preferred solution.

Before spraying UV rework water, you only need to polish the bad place, pay attention to local grinding, and then clean it, spray Jingchuan Chemical UV rework water (pay attention to the thickness of the spraying film of UV rework water, generally use low flow, cross spray evenly) Flip UV topcoat, without affecting the appearance of the product, according to the normal paint film operation, the selection of UV repair water does not need to scrap the material, waste the cost, and the operation is very convenient, does not affect the fullness of the product.

The surface of the workpiece is clean.

Make sure the paint is clean and not mixed.

The compressed air used for spraying should be refrigerated to remove oil, water and impurities.

If it is an assembly line, attention should be paid to the catenary to run off impurities to the workpiece.

Ensure that the spraying site and the paint oven are clean.

The first thing to do is what kind of paint you're using. Whether it is a general latex paint or an industrial paint.

Look at the reasons for the formation.

It's because the surface hasn't been cleaned or it's done later.

Take a look at it. How long it was sprayed. It is general latex paint. If it's not dry yet, it's easy to deal with.

Paint a little harder

The main reasons: 1 Product pre-treatment.

2 Spray booth environment.

3 Air supply. 4 The paint itself.

What material and what spray? With a strong oxidizing agent!

1. The surface is not wiped clean; 2. The inside of the bucket filled with paint is dirty, and there is no filter after adjusting the paint, and there are small particles in the paint; 3. The compressed air is not clean, and there is dust, oil or water in it.

The surface is not cleaned! You just wipe it with the dust removal part before spraying paint.

If you are a manager and don't understand, you can go to the supervisor, and if the supervisor doesn't understand, find a technician. If the technician doesn't understand, then you can come to me.

1. Scorching: Generally, baked plastic products have the highest use temperature, each plastic material is different, and the temperature of the jujube is also different.

2. Sell less oil slowly: This is the business of the injector. I was not careful at work, made an excuse, and fired him.

3. Oil accumulation: This is also the business of the injector. I was not careful at work, so I made an excuse and fired him on the stool.

4. Dust point: make a dust-free workshop. Hey. If there is no condition, clean the working position of the fuel injection point.

5. On-site management: You, you, you, if you don't listen to the arrangement, you will be fined 100 yuan. Under heavy punishment, they will be faithful. However, you should be careful when you go out, and it is best to bring a bodyguard if you can.

If you are scorched, you can adjust the speed of the UV lamp transfer belt a little, or reduce the UV intensity.

If you have less oil, you can slow down the speed of Jane's handprint head

If the oil is frankly pinned, it is to speed up, or add a little bit of boiling oil and water, oil injection and dust points to the ink, which is the problem of on-site 6S work.

The problems you mentioned are generally technical problems, and the key lies in the machine and ink.

The quality of the large-area high-quality spray gun is very important!

Surface treatment (grease and static electricity removal) before spraying.

Hello, by [Pengyu purification i8673311600] for you to answer: how to dust plastic products?

When the plastic product itself is made, it is easy to generate static electricity due to friction, and it is easy to absorb dust if there is static electricity on the product.

To solve your problem, you only need to remove static electricity, and there are many ways to remove static electricity, such as air washing, ultrasonic washing.

Air washing: The principle of high-pressure ionized air is used to remove the static electricity on the product first, and then the dust is removed. For example, there are dust removal equipment on the surface of products, dust removal lines for plastic products, dust removal equipment for blister boxes, etc.

Ultrasonic: Mainly through the transducer, the sound energy of the power ultrasonic frequency source is converted into mechanical vibration, and the ultrasonic radiation is radiated to the cleaning solution in the tank by cleaning the tank wall. Due to the radiation of ultrasonic waves, the microbubbles in the liquid in the tank are able to maintain vibration under the action of sound waves.

Destroy the adsorption of dirt and the surface of the cleaning parts, cause fatigue damage of the dirt layer and be repulsed, and the vibration of gaseous bubbles scrubs the solid surface.

Some companies are not allowed to use water, which is too costly and complicated due to the need for environmentally friendly treatment.

Wash with industrial dish soap and you're good to go.

Spray with ionic wind.

1. Artificial ionized air dust removal.

2. Dust removal of blister box dust removal line.

3. Washing. If the dust on the blister box is adhered to and needs to be washed with water, it can be solved by using ionizing air to adsorb the above, and the specific dust removal method can be referred to.

1. It is easy to form internal stress when plastic is molded, and it is easy to crack at the stress concentration after coating. It can be annealed or treated on the whole surface to relieve stress.

2. The surface of plastic parts is often stained with oil, hand sweat and release agent, which will make the adhesion of the coating worse, and the coating will crack, blister and fall off. Degreasing should be carried out before painting.

3. Electricity removal and dust removal: plastic products are insulators, and the surface resistance is generally about 1013, which is easy to produce static electricity. After being charged, it is easy to absorb fine dust in the air and adhere to the surface.

4. The thickness of the plastic coating is 15 20 m, and it usually takes 2 or 3 sprays to complete. After one spray, it is allowed to dry for 15min, and then the second spray is carried out. Clear paint must also be applied to the surface that needs to be shiny, and the finished part has little effect on flame retardant properties.

5. After coating, it can be self-dried at room temperature, or it can be baked at 60 conditions for 30min.

The coating of the plastic surface is particularly common and important, but in the actual coating process, the surface of the paint or the coating peeling off and other problems will play a role in the quality and effect of the coating will play a role in the destruction, so to solve the problem of coating adhesion on the plastic surface has become a common phenomenon in the coating industry.

So what should I do if the plastic surface spray paint 100 grid adhesion test can't pass the paint off? First of all, find out the reason why the adhesion is poor but not 100 grid test. After an in-depth understanding of the coating and coating industry, in fact, the main factor affecting the adhesion stability of the paint film is caused by the insufficient adhesion between the substrate and the coating.

Generally, the solution to the problem of paint peeling caused by false adhesion of plastic oil injection is through the principle of activating the molecules on the surface of the plastic, and the traditional method is to use flame and corona. Now it is common to use the adhesion enhancer developed by Jiongsheng treatment agent to solve, for example: by spraying nylon adhesion enhancer between the substrate and the paint, biting into the nylon plastic, changing the nylon surface molecule, so as to solve the problem of paint peeling caused by false adhesion, and the adhesion test of 100 grids reaches 5b.

When the plastic surface is sprayed and the paint is peeled off and the Jiongsheng adhesion enhancer is used, due to the oil stain or other stains that affect the adhesion performance on the surface of the workpiece, the combination of the coating and the substrate will not meet the reliable adhesion requirements, resulting in cracking, blistering and paint peeling. Therefore, before use, it is necessary to clean the surface and remove oil, etc., to ensure that the adhesion promoter can play its role in improving the adhesion of the paint film on the plastic substrate, so as to improve the adhesion between layers and solve the problem of false adhesion and paint loss.

The surface treatment of plastic shell spraying first needs to clean and clean the surface of the plastic substrate, remove oil, dust and other dirty substances, and then carry out spraying construction, but when the actual painting is done, there are more problems often when the paint falls off or the paint falls off during the 100 grid adhesion test.

The main reason for the phenomenon of paint peeling on the plastic substrate is that the adhesion between the paint and the substrate is not enough, and the plastic materials, such as PP substrate, are non-polar materials, with poor surface adhesion properties, while nylon substrates have high crystallinity and low surface energy, so often after painting, the paint firmness is poor, which is the main reason for the paint to fall off or the paint to fall off in the 100 grid test.

Shizukawa plastic adhesion treatment agent can be sprayed on the surface of the substrate through primer to form a dense film layer, which can effectively wet the surface of the substrate, and the film thickness formed can promote the adhesion of the coating to the film layer. The chlorinated polypropylene diffuses to the inside of the substrate, fully wets the surface of the substrate to increase the intermolecular force, and chemically bonds with the topcoat to improve the adhesion of the topcoat to the material.

Depending on the substrate, the type of adhesion treatment agent is also different, because the molecular structure and surface properties of the material are different, so it is necessary to understand the substrate when choosing an adhesion treatment agent.