If you know more about the Binks paint spray gun you will perform it better. We will talk in detail about how a spray gun is used. It will tell you how to aim, move and adjust it for obtaining different results. Even if you use these Binks spray guns differently you will achieve the same result.
Gun distance or speed is easily compensated by air pressure changes.
Techniques in the gun lead can huge differences in throughput and transfer efficiency.
Spray heads and guns are the same. These guns are handheld. Moving holders are used for mounting heads like chain-on-edge or a reciprocator (or a robot). Now go to faqs on the Binks spray guns.
Break these droplets into tiny parts and direct all these parts for coating. The highest possible transfer efficiency is delivered by the guns (%age for sprayed paints which reach the part).
How many kinds of Devilbiss spray guns are there?
There are several kinds of Devilbiss spray guns present. Airless, conventional, HVLP guns and air-assisted airless are commonly used. Conventional spray guns are of pressure, suction-feed type and gravity. Electrostatic guns are also available. Gravity guns and suction feed are not for production work as they rarely can hold more than one quarter.
How is paint usually supplied to a gun?
Following are techniques for getting the paint to a gun:
1. Pressure feed: In this way, paint is pumped to the gun. Mostly these guns are used for production work.
2. Suction or syphon feed. Cup guns use these techniques. These equipment are simple but the paint-holding capacity of the gun is limited to the cup size. It is more than one quarter.
3. Gravity feed Paint normally flows by gravity to the gun. For delivering the paint no external air is used. Some HVLP guns use air pressure for enhancing paint delivery.
Are the various types of guns used differently?
Some differences are present. Gun speed and the recommended distance from the gun to the part are the most important ones. Different gun manufacturers recommend distances like shown:
Typical gun-to-work distances for paint spray guns:
Binks Conventional Spray — 6-8 inches
Airless — 12-14 inches
Binks HVLP — 8-10 inches
ITW Electrostatic — 10-12 inches (see Note)
One inch of distance per thousand volts is required on the electrostatic gun.
Operator preference is usually used to describe gun speed. HVLP guns need faster movement to avoid flooding.
Why are there different types of guns? Each of them has advantages in using them.
Yes, you are right as every gun has its advantages and disadvantages.
Pros and cons of each gun type
This is a common question and the answer is given in the following table.
What about the ITW Ransburg electrostatic guns? They are not listed in the table
Because all guns mentioned above can be used as electrostatic units. These guns always use a grounded part to attract electrically charged paints. It results in high efficiency. Paint usage can drop fro 20-50 percent which depends on the voltage, humidity and especially shape of the part.
Then we use Binks non-electrostatic guns?
Because somewhere these parts are conductive and not very complex in shape. For some systems, these plastics are not electrostatic enough. According to a Friday cage effect, the electric field between the gun and the part does not penetrate the corners. So complex shapes are hard for coating. Electrostatic equipment when compared with traditional stuff is more difficult to maintain. A low volume of shops does not justify the extra costs. For an electrostatic system to work its increased transfer efficiency should be considered.
How can I know I have the best Binks gun?
Check the manual as it comes with every gun. If it’s not readily available in your shop to make sure it is present. Find it and read it.
What is written in it?
It addresses the following stuff:
1. Spraying at the lowest pressure
2. Maintaining a consistent distance
3. Your gun should be perpendicular to the work
4. Each pass is overlapped by 50%
5. Each pass gun should be triggered.
6. Maintain your gun properly
What is sprayer high pressure? My sprayers love it
They only love it because they don’t buy the paint themselves or clean their mess. High air pressure makes the paint droplets too small. The solvent is lost by them very easily and they don’t flow-out well on the part. Blowing is also a very serious problem in this case. Many among them miss this part or blow off. This means more expense, maintenance, and mess.
What should be the air pressure?
Following factors will determine it:
2. Solvent blend
4. Distance to the part
Pressure can be too high or too low. The fan shape is achieved with high air pressure. It’s also thin in the middle. High atomization gives too large vapors which can lead to sagging.
How to check droplet size?
Trigger the gun and pass it quickly over the non-porous surface like a metal or glass piece. While moving the gun you can see individual droplets.
How to check the air pressure?
Start with the lowest pressure and then increase it like a 5-pound step. After each increase check the droplet size. Droplets will become smaller and more uniform. A saturation point will be reached where an additional 5 pounds won’t affect the droplet size but will change the nearby droplets. Do not go on further but even drop the pounds 3-5. If you need more or less air pressure then adjust the fluid flow.
Why is gun-to-part is important?
It plays a role in thickness and wetness. If your gun is too close to the work the surface can be flooded and sags or pops can result. Being far away means your film is too thin or thick. Dry spraying, orange peel or poor hiding can result.
Why are right angles staying is necessary?
Because if you fan your gun from left to right or heel it up and down. The result will be a great variation in the gun-to part distance. Droplets going on higher distance will dry out more and thin out. Unequal wet films will also result from it.
Some areas will be sag or contain the wrong glass. Colors will also change.
My parts are complicated and staying perpendicular to it is very difficult. What should I do?
Do what suits you more. Just do the best you can do. Good sprays also work wonder if you know the conditions and have enough time.
Why should I overlap each pass by 50 percent?
For achieving the fine film band. You can overlap over the one part to another number like one-third or one-fourth. This result will be a uniform firm build. You just don’t overlap by one over 2.5 or any other fraction which includes a non-whole number. If you do these results will be uneven thick regions of the film. It is unnecessary but half and last past are just air coating. If you don’t coat air with a half width of fan the other half width will not be coated. Also, your dry film will be too along with the film.
What does gun triggering mean?
At each stroke triggering means stop spraying.
Why the gun should be triggered?
For reducing mess, saving paint and avoiding excessive film build. If you didn’t trigger then carry this part off the gun and also back pass over it for the next pass. Must pass the trigger gun over the part and then back over it for the very next pass. Or you must have triggered a gun directly in the next pass while you aim for it. If you carry the triggered partway off the gun too much paint is used. By using this step next pass builds wet films at each end stroke. It can result in too high gloss, sags or both of them.
We never heard of triggering. From where this idea come from?
From common sense and gun instruction manual. Most paint shops don’t have a sprayer unless he/she triggers. It becomes automatic. Experienced learners can do it.
Automatic equipment also triggers. Right?
What is done for maintaining the gun properly?
The manufacturer’s instructions are followed. Of course, you need the manual. Wipe air cap off now and with a solvent rag. For cleaning inside passages use a gun cleaner. Lubricate gun with the manufacturer’s recommendations. Atomization patterns should be checked once or twice a day.
What is the atomization pattern? How you can check it?
The paint fan shape is the atomization pattern. It needs to be round and have a uniform distribution of paint droplets. It is done when you trigger the gun at the non-porous surface. By holding the gun in an oval position you can check the droplet uniformity distribution.
Do all these comments apply to both electrostatic and airless spray?
Yes but with some additional comments as well.
Then what are they?
The electrostatic spray has 3 additional stuff for considering:
1. Faraday cages
Operators must be grounded when you are applying the electrostatic charge so that it can complete its circuit. It doesn’t mean that the ground needs to be very good. Five hundred thousand ohms or less is better.
Wow, it seems a lot of resistance. Is it worth it?
It’s only when you consider less than 100 microamps or 100,000 volts are involved. Ohm’s law clearly states that such a high voltage can push this small current through a magnitude.
Can I measure this resistance with my ohmmeter?
No, as very low currents are involved so need a manometer. One of them consists of a 500-volt battery.
Why is it important to ground the operator?
This operator is not becoming charged. It is an efficient-charging device. The electric charge is sent to every nearby conductor. The operator is nearby and can store electricity in his body. Booth ground can also store electricity. If your operator becomes charged an arc can be created for the charging. Arcs act as a fire hazard.
How grounding the operator help?
In this way, electricity is not gathered in a conducive place. It is conducted away from the ground. This does not affect the operator. The person cannot feel it and avoid a charge from accumulating on the paper and can result in an arc if the operator approaches the ground.
How do you operate?
By wearing conductive shoes and maintaining skin contact with the gun. The power cable is used to ground the gun.
What are the Faraday’s cages?
It is any recess that shows that the electric field doesn’t penetrate. Deeper recesses are wide and cause trouble. Recesses field don’t go into the recess. It curves sideways to get the grounded part as quickly as possible.
What can be done if the part has troublesome recesses?
The field is forced by turning it into a recess. If the voltage is high spark can occur between the gun electrode and the part. We don’t want sparks around the paint booth. Fire can result. Turning the voltage down can also help. Paint droplets momentum allows it to break from electric field-free and move in a straight line toward the path and a recess. Some guns also have a power switch on and off for operating it easily.
What is the problem with humidity and electrostatic spray?
High humidity in the air allows electric charge to leak off from the points before they reach a point. It is considered an inefficiency but nit any danger. Wraparound is lost in this way and your efficiency goes down.
How to overcome a high humidity problem?
Sometimes voltage turning high is also useful. Dehumidifying the booth can help.
How high should be humidity?
It is according to the paint formulation. Ask your paint supplier for the guidance.
What is different about airless spray?
Mostly safety differences are present. High paint pressures are used by airless guns. 3500 PSI pressure is the excess one. These lower pressures can cause cut in the skin. Solvent and pigment become embedded in the body and also cause poisoning problems. Simple cutting can also occur.
So, what can be done to reduce the hazards?
Following three steps must be a routine practice:
1. Don’t point the gun at another person
2. Safety tips should not be removed with the gun. Tip prevent gun contact with the tip and skin. This is a safety pressure.
3. A safety lock should be used when the gun is not in use.Are you solving an issue regarding gun techniques? Contact us.