How long does corona surface treatment last?
six monthsWhen treating paper with Corona you will get the benefits of cleaning the surface and removing any unwanted paper fibres that could create pin holes during the coating process. The treatment level lasts for a minimum of six months.
What is corona treatment plastic?
Corona treatment is used to increase the surface energy of plastic and other materials for improved adhesion of inks, adhesives, and coatings. Corona treated materials feature higher printing and coating quality than materials that do not undergo this treatment.Jul 26, 2021
How do you get corona discharge?
The corona discharge is created when the high voltage and frequency electrical potential is applied to an electrode (ex. wire electrode or spring tip electrode). The corona discharge ionizes nearby atmosphere and when this is applied directly to the material it increases the surface tension of the material.Nov 29, 2021
What is corona discharge and why does the blue light emit from the process?
Corona treatment is a different form of plasma. It produces plasma by applying enough voltage across two electrodes with air space between them. The high voltage ionizes the air in the gap to produce the corona, which usually looks like a blue flame. Ozone is generated from oxygen in the air in the corona.
Is corona discharge harmful to humans?
These gases are corrosive and can degrade and embrittle nearby materials, and are also toxic to humans and the environment. Corona discharges can often be suppressed by improved insulation, corona rings, and making high voltage electrodes in smooth rounded shapes.
What is the difference between corona and plasma treatment?
Plasma systems are used when corona treatment, which again ionizes only air, are unable to produce the desired treatment results. In some cases, plasma treatment produces higher and longer lasting surface effects than corona, but the benefits must offset the additional equipment investment and operational costs.
How can corona effect be reduced?
The corona effect can be minimized by increasing:The length of conduct.Spacing between conductors.Diameter of conductors.Both spacing between conductors and diameter of the conductors.
Why does corona happen?
The corona effect occurs naturally due to the fact that air is not a perfect insulator – containing many free electrons and ions under normal conditions. When an electric field is established in the air between two conductors, the free ions and electrons in the air will experience a force.Oct 26, 2020
What is corona effect and skin effect?
… See more1- corona effect is due to the ionization of air and decompozition of fluids ( rain water on line or moisture) and also by any injury on conductor. 2- skin effect mostly occurs on solid conductor. As electricity is THE FLOW OF ELECTRONS and the nature of electon is, IT FLOW NEAR the surface.Feb 5, 2015
What is positive corona discharge?
Positive corona discharges have a much lower free electron density than negative coronas. However, the electrons in a positive corona discharge are concentrated and contain more energy. Negative corona discharges appear larger than positive ones.
What does corona discharge sound like?
0:061:39Corona Discharge - YouTubeYouTubeStart of suggested clipEnd of suggested clipBecause it causes audible noises and radio interference. And it's also damaging to the conductorsMoreBecause it causes audible noises and radio interference. And it's also damaging to the conductors and hardware Corona is worse around sharp edges.
What is corona in transmission?
Definition: The phenomenon of ionisation of surrounding air around the conductor due to which luminous glow with hissing noise is rise is known as the corona effect. Air acts as a dielectric medium between the transmission lines. In other words, it is an insulator between the current carrying conductors.
What is corona treatment?
If you have ever faced adhesion problems in your productions, a corona treatment might be the right solution for you. A corona treatment is used to...
How does corona treatment work?
The low surface energy of certain materials often leads to poor adhesion of inks, glues, and coatings which by nature present significantly high su...
What types of materials can be treated?
Corona treatment usually involves the handling of surfaces made from materials such as: Polypropylene Vinyl Foils Polyethylene Metalized surfaces P...
How long do the effects of corona treatment last?
The lifetime of a Corona treatment depends on the treated material and the storage conditions. Since the effects of a Corona treatment tend to degr...
Will it work for my products?
Our experts look forward to discussing your individual needs and finding the right solution for your adhesion problems. We also offer free in-house...
Where should the corona treater be placed?
The equipment is usually installed in-line in a place that is aligned with the printing, coating, or bonding process. A corona treater can also be...
How much does it cost?
The costs of a corona treatment depend on your individual requirements. The treated material, its dimensions and responsiveness to corona treatment...
Overview
Corona treatment (sometimes referred to as air plasma) is a surface modification technique that uses a low temperature corona discharge plasma to impart changes in the properties of a surface. The corona plasmais generated by the application of high voltage to an electrode that has a sharp tip. The plasma forms at the tip. A linear array of electrodes is often used to create a curtain o…
History
The corona treatment was invented by the Danish engineer Verner Eisby in 1951. Verner had been asked by one of his customers if he could find a solution which would make it possible to print on plastic. Verner found that there were already a couple of ways to accomplish this. One was a gas flame method and the other was a spark generating method, both of which were crude and uncontrollable and did not produce a homogeneous product. Verner came up with the theory tha…
Materials
Many plastics, such as polyethylene and polypropylene, have chemically inert and nonporous surfaces with low surface tensions causing them to be non-receptive to bonding with printing inks, coatings, and adhesives. Although results are invisible to the naked eye, surface treating modifies surfaces to improve adhesion.
Polyethylene, polypropylene, nylon, vinyl, PVC, PET, metalized surfaces, foils, paper, and paperboardstocks …
Equipment
Corona discharge equipment consists of a high-frequency power generator, a high-voltage transformer, a stationary electrode, and a treater ground roll. Standard utility electrical power is converted into higher frequency power which is then supplied to the treater station. The treater station applies this power through ceramic or metal electrodes over an air gap onto the material's surface.
Pre-treatment
Many substrates provide a better bonding surface when they are treated at the time they are produced. This is called “pre-treatment.” The effects of corona treatment diminish over time. Therefore, many surfaces will require a second “bump” treatment at the time they are converted to ensure bonding with printing inks, coatings, and adhesives.
Other technologies
Other technologies used for surface treatment include in-line atmospheric (air) plasma, flame plasma, and chemical plasma systems.
Atmospheric-pressure plasmatreatment is very similar to corona treatment but there are a few differences between them. Both treatments may use one or more high voltage electrodes which charge the surrounding blown gas molecules and ionizes them. However, in atmospheric plasm…
See also
• Flame treatment
• List of plasma (physics) articles
• Plasma activation
• Polymeric surface
• Surface finishing
External links
• Technical article describing how surface treatment with Corona and plasma works
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