Omar Khalid
Static electricity can cause a lot of problems when working with plastic, from dust attraction and shocks to clumping and blockages. To avoid these issues, it is important to remove static electricity from plastic before painting or further processing. This can be done in several ways, including increasing humidity, using a grounded whiskered pickup, anti-static brushes, or an ionising blower, or by spraying on a diluted solution of water and dish soap.
Removing Static from Plastic Before Painting
| Characteristics | Values |
|---|---|
| Add humidity | Use a grounded whiskered pickup to touch the surface of the plastic |
| Wipe with anti-cling sheets | Use the sheets that go into the dryer to wipe the plastic |
| Use a diluted solution of water and dish soap | Spray the solution onto the plastic and do not wipe it off |
| Use anti-static brushes | Use brushes with a Polonium strip to get rid of dust and lint |
| Use a spray to remove static | Similar to sprays used by vinyl record lovers to remove static without leaving residue |
| Use an ion pump | Neutralise the static charge to prevent it from repelling ink |
| Use an ionising flow tube | Neutralise static charges to allow material to flow freely through ductwork |
| Use a jet stream system | Remove contaminants from product surfaces without using compressed air |
| Use a Pulsed DC bar | Neutralise static charges, prevent dust attraction and allow items to stack evenly |
| Use an ionising air curtain | Neutralise static charges and help remove parts |
| Use a long-range Pulsed DC system | Deliver widespread ionisation without requiring an air delivery system |
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What You'll Learn
Spray diluted water and dish soap
To remove static from plastic before painting, one effective method is to use a diluted solution of water and dish soap. This technique is simple and straightforward, and it will help you achieve the desired results without causing any interference or leaving any residue.
Here's a step-by-step guide on how to do it:
Prepare a Diluted Solution: Mix a small amount of liquid dish soap with water. The exact ratio can vary, but it should be diluted enough that it forms a thin film when sprayed onto the plastic surface. Fill the mixture into a spray bottle, preferably one that produces a fine mist for even distribution.
Spray the Solution: Hold the spray bottle a few inches away from the plastic surface and evenly coat the entire area. Make sure to pay extra attention to corners, edges, and any textured areas where static charge tends to accumulate. It is important that you do not wipe off the solution after spraying, as this will disrupt the film that controls static buildup.
Allow the Film to Form: After spraying, let the solution dry. It will form a thin film on the plastic surface, which works to control static buildup. This film will be virtually invisible and will not affect the appearance of the plastic.
By following these steps, you can effectively remove static electricity from plastic surfaces before painting. This method is safe, easy to perform, and does not require any specialized equipment or chemicals. It is a practical solution for preparing plastic surfaces for painting, ensuring that you achieve the desired results without any static interference.
It is worth noting that this method of using a diluted solution of water and dish soap has been historically employed in the aerospace and missile industries to control static electricity, demonstrating its effectiveness and reliability.
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Use anti-static brushes
Anti-static brushes are a great way to remove static from plastic before painting. The term "anti-static" is used to refer to low-charging brushes, static dissipative brushes, and conductive brushes. These brushes differ in their unique properties and specific uses.
Conductive brushes are ideal when you require a static charge of 0v. They are commonly used in copiers, where the static charge on the paper, though small, causes the sheets to cling to each other. The conductive fibres in the brush do not harm the equipment during the rapid discharge.
Static dissipative brushes are recommended when working with products that could be damaged by a high current flow during discharge. These brushes reduce the current flow by introducing a high resistance between the charged surface and the resting surface of the equipment. However, they do not reduce the static charge to 0v, and at a certain point, the electric charge will remain on the product.
Low-charging brushes, as the name suggests, are used when a low charge is acceptable. They are commonly used for non-electronic applications.
When selecting an anti-static brush, it is important to consider the specific application. For electronic applications, opt for brushes with small-diameter fibres. Soft fibres are preferred as they achieve the same result while abrading much slower than stiffer fibres. For non-electronic purposes, you can use brushes with thick metal and synthetic fibres for a stiffer brush, or thin fibres for a softer brush.
Wood is the most cost-effective option for brush handles, but it is not suitable for cleanrooms. Instead, materials like aluminium, brass, and stainless steel are commonly used for conductive applications.
Anti-static brushes are an effective solution to remove static from plastic before painting, ensuring optimal results and preventing any potential issues caused by static electricity.
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Increase humidity
One way to remove static from plastic before painting is to increase the humidity. This can be done in several ways:
Firstly, try spraying a diluted solution of water and dish soap onto the plastic surface. This technique forms a film that controls static buildup and has been used in aerospace and missile plants in the past. It is a simple and effective method that does not require any specialized equipment or products.
Another way to increase humidity and reduce static is to use anti-static brushes. These brushes were once commonly available in the photo business to remove dust and lint from negatives before printing. The brush contains a Polonium strip, which helps to discharge static electricity.
Additionally, consider using a grounded whiskered pickup in contact with the plastic surface. This method is often used in laser printers to discharge static electricity from moving paper sheets. The larger the area the pickup covers, the more effective it will be.
For small plastic items, a compressed air-driven cleaning system can be an economic and effective solution. This method increases humidity and helps to remove static charges, ensuring that paint adheres properly to the surface.
Finally, if you have access to one, an ion pump can be highly effective in removing static electricity from plastic. This method is often used in bubble jet printers to eliminate static and prevent ink repellence.
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Use anti-cling sheets
If you're planning to paint on plastic, removing static from the surface beforehand is essential to ensure the paint adheres properly and that you achieve the desired finish. One effective method to eliminate static cling from plastic is to use anti-cling sheets, also known as dryer sheets or anti-static sheets. These sheets are typically used in laundry dryers to reduce static and prevent clothes from clinging together. However, they can also be employed to remove static from plastic before painting.
To use anti-cling sheets for this purpose, follow these steps:
- Choose the Right Sheets: Select anti-cling sheets that are designed for use in clothes dryers. These sheets are infused with fabric softeners and anti-static agents, which help dissipate static electricity.
- Prepare the Plastic Surface: Ensure the plastic surface is clean and dry. If there is any dust or debris, gently wipe it off with a soft cloth. It's important not to use abrasive materials that could scratch the plastic.
- Wipe the Plastic with the Sheets: Take an anti-cling sheet and gently wipe it across the plastic surface. Cover as much area as possible, ensuring contact between the sheet and the plastic. You may need to use multiple sheets if the plastic surface is large.
- Reapply as Needed: If the static persists, you can repeat the process, using fresh anti-cling sheets. This method is straightforward and effective, making it a popular choice for removing static from plastic.
It's important to note that while anti-cling sheets are a convenient option, they may not be suitable for all types of plastic. Some plastics, such as Plexiglas, can be sensitive to scratching, so it's advisable to test the sheets on a small area first or consult a specialist plastics supplier for advice. Additionally, if you're working with plastic sheets that have a protective film, peeling off the film can create enough static to interfere with painting, so it's best to address the static issue before removing the film.
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Install an ionising blower
Ionizing blowers are an effective way to remove static electricity from plastic. Ionizing or anti-static blowers are versatile tools that can control or remove static electricity from plastic and other non-conductive materials like paper, glass, and even human bodies. They are a good choice for reducing static electricity and operator static shocks, especially in large areas.
When choosing an ionizing blower, consider the area you need to cover and the volume of ionized air required. For example, the Model 320 or 320 IPS Blowers are designed for applications requiring high volumes of ionized air over a large area. The 320 IPS blower, with its internal power supply, is a good option for an easy installation if you're using just one blower. If you need to cover a wider area, you can mount multiple blowers end-to-end.
The SJ-F700 Series Multi-Sensor Ionizer is another option that offers complete automation of periodic maintenance, eliminating the need for manual performance checks. It provides maintenance-free operation with an ion balance of +/-1V, an elimination speed of 0.5 seconds, and a static elimination area of 3m.
If you're looking for high-speed and high-accuracy, the SJ-F2000/5000 Series static elimination blowers offer the fastest static elimination performance and high-precision ion balance, along with a wide-range airflow adjustment function. This series also has functions that suppress wear and dirt build-up, making maintenance easier.
It's important to note that some ionizers don't use blowers and are better suited for delicate parts sensitive to dust and wind pressure. These non-blower ionizers can remove static charges without using air, preventing sheets and films from fluttering.
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Frequently asked questions
You can try a few methods to remove static from plastic before painting, including:
- Using a grounded whiskered pickup to touch the surface of the plastic.
- Wiping the plastic with anti-cling sheets.
- Installing an ionising blower or a Pulsed DC bar to neutralise the charge.
- Spraying a diluted solution of water and dishwashing soap onto the plastic.
A grounded whiskered pickup is a tool that comes into contact with the surface of the plastic and discharges the static electricity. The larger the area it covers, the better.
You can often find grounded whiskered pickups in laser printers, which use them to discharge static electricity from paper sheets as they exit the printer.
An ionising blower or a Pulsed DC bar is a tool that neutralises static charges. It can be positioned over a conveyor and collection bin to prevent dust attraction and mould damage, and to ensure that parts stack evenly.
You can try spraying a diluted solution of water and dishwashing soap onto the plastic. This will form a film that controls static buildup and won't leave any significant residue.
