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  1. Guide to Plasma Surface Treatment and Corona Surface Treatment in Medical Device, Pharma, and Labware Manufacturing

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    Guide to Plasma Surface Treatment and Corona Surface Treatment in Medical Device, Pharma, and Labware Manufacturing

    Medical practitioners are increasingly utilizing plastics in their devices and instruments due to the material’s versatility, quick processing, light weight, bio-compatibility, sterility and price point. Plasma and corona surface treatment are an ideal fit for medical, pharmaceutical, and labware manufacturing. Once surface treated the value of inexpensive polymer parts greatly increases due to now becoming specialized, functionalized, engineered components. Plasma and corona surface treatment produce reliable, durable, and uniform results through electrical discharge that heighten energy on the surface of polymers and other substrates to increase their capacity for adhesion and bonding.

    What Can Plasma Surface Treatment and Corona Surface Treatment

    Corona Surface Treatment

    Note how the ink adheres in the center of the bottle where it was plasma treated with 3DT’s PlasmaDyne Pro.

     Achieve in Medical Device Manufacturing?

    Medical device manufacturers use plasma and corona surface treatment for various reasons. First, surface modification improves adhesive, coating, and ink bonds with a substrate by chemically changing substrates from being hydrophobic to hydrophilic. Manufacturers utilize corona and plasma treatment to solve complex challenges, especially plastic material applications that present incompatibility issues for bonding. Other specialized applications include applying protective coatings that either draw or fend off fluids and improved cell adhesion in laboratory containers made from polycarbonate and polystyrene.

    What Are Some Useful Applications for Plasma and Corona Treatment in the Medical Industry?

    Within medical manufacturing, the range of uses for plastics is vast. As a result, corona and plasma technology is regularly used for improving the bonding power of ink, adhesives and cell culture growth. Surface treated items include syringes, tubing, pipettes, bottles, flasks, vials, multi-well plates, Eppendorf tubes, culture plates, and other polymer labware items manufactured for research, drug discovery, and diagnostics testing. Surface treatment is employed for all types of parts and components for medical devices and pharma packaging.

    Plasma treatment can assist the bonding of dissimilar materials. This can involve bonding metal to plastic, silicon to glass, polymers to other polymers, biological content to microtiter plates, and even bonding to polytetrafluoroethylene (PTFE). Whether bonding metal to plastic, silicon to glass, polymers to other polymers or biological content to microtiter plates, corona and plasma can be used to promote adhesion. 

    Adhesion promotion is achieved by increasing the substrates surface-free energy creating a dramatic improvement in bonding. In some cases, up to a 50x increase in bond strength can be achieved.

    What Are the Benefits of Using Plasma and Corona Surface Treatments?

    Plasma and corona surface treatment generate numerous benefits for medical, pharmaceutical, and laboratory components. These treatments offer:

    Syringe, Tubing, Corona Treated, Printed

    Surface treatment creates secure bonding of ink, coating, adhesive and more.

    High-Quality Results

    Businesses in these sectors all require reliable, high-quality products for critical applications, making plasma and corona treatment ideal. As these surface treatments ensure consistent and superior wettability, the resulting products will have greater capabilities for adhesion—even for the most challenging of plastic substrates—as well as overall product performance. The secure bonding with media such as ink, paint, and adhesives is an important benefit for medical devices, changing a two-dollar plastic part into a fifty-dollar component. 3DT specializes in developing these processes and systems for customer’s unique applications. 


    Both plasma and corona surface treatment are typically fast, usually taking little time at all, depending on the process and materials. Treating can take just seconds to complete, with the potential for treating up to 1,000 parts per hour. As an added benefit, these surface treatments do not necessitate primers, curing or drying; cutting those stages from the production timeline for greater time savings.


    These processes are an excellent solution for products that need treating on the whole of their surface, even hard-to-reach nooks, crannies, and drill holes. As such, they are ideal for 3D components with complex configurations, providing consistent, reliable pretreatment. Processes utilize highly repeatable, recipe-based programming.


    3DT’s MultiDyne with 2 treating heads treats a medical device placed on a spinning mandrel prior to printing.


    Plasma and corona surface treatments have opened up additional opportunities for medical manufacturers. To start, the speed of these treatments plays a part in increased savings. They can also reduce operating costs by allowing companies to adopt the use of alternative materials that are less expensive than typical base substrates, as well as chemicals, primers, and adhesives. This also leads to less scrap and waste generated which equates to greater savings as well.

    Environmental Friendliness

    Surface treatment improves the adhesion of environmentally-friendly, solvent-free, water-based primers, adhesives, and inks, eliminating the use of chemical baths and primers.  Plasma surface treatment, unlike chemical processes such as priming or etching, are clean processes that do not produce environmentally harmful waste. Instead, they give off minor amounts of non-hazardous gasses only. Corona processes generate ozone, but using an ozone filter eliminates the issue. Additionally, corona and plasma do not use an open flame, and are much safer for operators. 

    What Medical Devices Are Treated with Plasma Surface Treatment or Corona Surface Treatment?

    Medical Devices

    3DT’s FlexiDyne Pro quickly corona treats polystyrene labware for improved cell culture growth.

    Plasma and corona surface treatments are applicable for:

    • Ampules, vials
    • Catheter tubing
    • Implants
    • Insulin pens
    • Lenses
    • Medication bottles
    • Needle hubs
    • Ostomy bags
    • Petri dishes
    • Labware: flasks, multi-well plates
    • Surgical instruments
    • Syringes

    3DT is Your Source for Corona & Plasma Technology

    Plasma and corona surface treatment are vital in healthcare manufacturing for providing effective, reliable adhesion and product performance. As a leading manufacturer in surface treatment, 3DT LLC provides clients with innovative, high-performance bonding solutions for a wide variety of substrates from plastics and rubber to glass and metal. We offer both standard and custom-engineered systems for greater application versatility. Learn more about our product line here. Our team can incorporate 3DT’s systems into new or existing production lines. For more information on our capabilities and how our surface treatment technology can support your operations contact us today at or call 1-262-253-6700.


  2. How Surface Treatment Functionalizes & Activates Difficult Bonding Surfaces

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    How Surface Treatment Functionalizes Activates Difficult Bonding Surfaces

    Many secondary processes prior to decorating and bonding require strong adhesion to be successful. However, certain substrates have insufficient surface energy for creating the required bond strength. To bond these types of challenging materials, surface treatment such as plasma or corona treatment significantly improve adhesion. This article will discuss some of the most common bonding challenges and outline how surface treatment overcomes these difficulties.

    What Is the Purpose of Surface Treatment?

    Surface treatment is used to improve bonding or “functionalize” the surface of a substrate. This useful technology modifies the surface of a material in a way that allows for strong bonds to be formed between the substrate and a label, a coating, print, or adhesive. Surface treatment, such as atmospheric plasma (also called in air plasma) and corona treatment work by improving surface tension. Numerous bonding problems are successfully solved through surface treatment, even those involving elastomeric or polymeric materials.

    printed sport bottle

    There are significant costs associated with bonding failure, including poor product field performance, excess scrap and rework, production inefficiencies, and increased quality control. Surface treatment solves virtually any bonding challenge, even when using the most difficult-to-bond materials.

    Corona and plasma surface treatment prepare materials for improved adhesion by:

    • Raising the material’s surface tension or wettability by altering the molecular properties of the surface 
    • Improving the bond strength between the applied media and the material
    • Plasma treatment provides mechanical etching and micro-cleaning, as well as elevating surface tension

    Bonding Items With More Than One Type of Material

    The power of surface treatment

    Note how the ink on the left side of the corona treated polystyrene tray fully bonds with the material, but beads up on the non treated right side.

    Materials that feature low surface energies, such as those between 20 and 40 dynes, are notoriously difficult to bond. In plastics, this includes materials such as polytetrafluoroethylene (PTFE), polypropylene, and polyethylene, polystyrene, among others. Composite materials are also challenging in bonding applications because the different materials they contain typically feature differing surface energies. 

    Achieving workable wettability of a substrate requires the surface energy of the substrate to exceed the surface tension of the media being applied. Using surface treatment to increase the substrate’s surface tension causes media to evenly flow and adhere to the material’s surface for highly improved bonding capabilities. 

    How to Activate the Surfaces of Difficult-to-Bond Materials

    When activating the surface of challenging materials, the first consideration should be the surface energy of the substrate. The surface energy will determine whether or not media will successfully bond with the material. Wettability is another prerequisite of successful adhesion. The term wettability describes the ability a liquid has to maintain contact with a type of media. It is influenced by intermolecular interactions that are altered through corona and plasma surface treatments.

    Atmospheric plasma is created by combining reactive gas molecules and an electric field. This system uses one or more high voltage electrodes, which charge the surrounding blown gas molecules, resulting in a highly ionized field that is forced onto the targeted surface. This ionized air stream reacts with the substrate and breaks the existing hydrogen bonds by introducing oxygen which recreates the chemical properties of the surface. This intensified reaction causes the material to wet out and accept media, as well as etches and micro-cleans the surface.

    3DT’s plasma treatment is not confined to a chamber, but performed in fast, inline production lines. What’s more, plasma is environmentally friendly and potential-free, meaning it can be used on or near metal parts and wiring.

    Corona treatment also improves a material’s surface tension to solve bonding problems. It is probably the most common and economical type of surface treatment. In contrast to plasma treatment, corona relies on two electrodes and an isolator to create a cloud of ionized air, corona discharge, that breaks molecular bonds on the surface of a material. Surface oxidation occurs, creating covalent bonds resulting in enhanced wettability and adhesion capabilities.

    3DT works closely with its customers in selecting the most appropriate surface treatment method for their application. Factors such as the materials and media involved, the geometry, line speed, and required bonding results are considered. See our blog article What is the Process for Purchasing a Surface Treatment System from 3DT? for more information.

    PolyDyne Pro Corona treatment system

    Custom PolyDyne Pro corona treatment system with indexing table for the treatment of labware flasks.

    Surface Treatments for Powerful Adhesion from 3DT

    Working with materials that are resistant to printing and bonding requires surface treatment processes that improve surface tension and eliminate bonding problems. 3DT manufactures a comprehensive line of surface treatment systems to improve bonding for numerous applications. Our solutions raise surface energy and improve bonding on even the most challenging substrates.

    With over 30 years of specialized experience, 3DT provides the most innovative corona and plasma treatment systems. Our equipment addresses the needs of diverse industries and can be used as stand-alone stations or incorporated into a production line. We specialize in process development for demanding applications. Learn more by visiting our corona and plasma treatment process page, or get started on your solution by requesting a quote today. 

  3. The Basics of Corona Treatment

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    For more than 30 years, 3DT has been a leader in providing high quality surface treatment solutions, including corona treatment equipment. Our innovative surface treating equipment can handle even the most challenging adhesion problems for a wide range of industries. With custom capabilities and a range of services, we can create systems based on your unique needs and application requirements.

    What Is Corona Treatment?

    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.

    Because polymers and many other substrates are non-porous, they don’t absorb ink, paint, and adhesive. Instead, media sits on the surface without bonding to it. By increasing the surface tension through microscopic chemical change of plastic materials, the ink or glue now has something to “hold on to”.

    Corona surface treatment can be applied to a wide range of materials, including, but not limited to:

    Polymers such as:

    • Polypropylene
    • Polyethylene
    • Polystyrene
    • Elastomers
    • PET
    • PVC
    • Polycarbonate
    • Vinyl
    • Silicone Rubber

    Other materials such as:

    • Foam
    • Foil
    • Aluminum
    • Metalized Surfaces
    • Glass
    • Composites
    • Paper

    To treat the material, it’s placed under a cloud of corona discharge, which is created by exposing atmospheric air to different voltage potentials. The electrons hold energy up to three times higher than what’s needed to break molecular bonds on the surface, and the free radicals quickly go to work oxidizing the material in the cloud. The result is increased surface tension, which allows for wetting and adhesion.

    The Benefits of Corona Treatment and How 3DT Can Help

    Besides improved adhesion for coatings, inks, and adhesives, corona treatment offers a wide range of benefits, including:

    • Fast production. Even the most stubborn material can be corona treated in a matter of seconds facilitating the fastest, high volume production lines.
    • Reduced waste. Materials have to be discarded if the adhesion process fails. Treating the surface ensures your paint, coating, or glue will stick the first time, so you won’t have any failed attempts that result in wasted time and materials.
    • Eliminates migrating additives. Many materials contain additives to enhance a particular quality of that material. Over time, those additives may migrate to the surface, and if they’re left to sit on the surface, the ink will bond to the additives instead of the material itself. Corona treatment removes any additives that have risen to the surface.
    • Reduce decaying surfaces. Bump treatment can be used to restore the surface tension in old, pretreated materials. This means you don’t have to worry about the surface decay of a material that’s been held in inventory for a long time. Simply apply the bump treatment, and you can return the surface to its pretreated adhesion potential.
    • Facilitates Green manufacturing. With the increased use of environmentally-friendly, solvent-free paints, primers and adhesives the need for surface treatment is more important than ever. Water-based products resist adhesion to many substrates, especially polymers, but not once they are corona treated.

    At 3DT, we improve adhesion and bonding on a wide variety of substrates, including polymers, rubber, composites, glass, foam, and more. Surface treatment systems for 3D objects are our forte, but we also manufacture systems for panels, sheets and film. Our comprehensive solutions go from design to manufacturing, installation, and service. Every sale is backed by our extensive experience and a dedicated sales and service team. Your success is our success, so we go above and beyond to create the best possible solution for your needs.

    Corona Treatment Solutions from 3DT

    Corona treatment is a highly beneficial process that is crucial for a wide range of substrates. Contact 3DT to learn more about our corona treatment equipment, or view our range of products to find the best solution for you. No matter where in the world you do business, you can find a distributor to connect you with the services you need.


    Infographic The Benefits of Corona Treatment



  4. Corona vs. Plasma Treatment

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    For more than 30 years, 3DT LLC has been a leading provider of specialized corona and plasma surface treatments for customers around the world. Our state-of-the-art systems can be used as stand-alone stations, incorporated into new and existing production processes, or integrated into fully or semi-automated production lines. With 3DT’s 2- and 3- dimensional treating systems and a wide variety of custom configurations, we have a solution for virtually any application. In addition to manufacturing our cutting-edge equipment, we offer services such as design, manufacturing, product handling, installation, training, and maintenance service.

    One of the more common questions we field about electrical surface treatment is, “What is the difference between corona and plasma treatment?” and then, “What best fits my application?” Both corona and plasma treatment increase the surface energy of numerous materials improving the adhesion of inks, adhesives, coatings, and other agents. However, they both have unique properties that require consideration in terms of applications.

    PlasmaDyne Pro surface treatment system from 3DT

    In this post, we discuss the advantages and uses of corona treatment vs. plasma treatment, to aide in your understanding. However, our sales team will actively guide you in selecting the best system for your material, process and application.

    What is Corona & Plasma Treatment?

    How Does it Work?

    Corona and plasma treatment are both forms of electrical surface treatment. They use the power of electrical energy to change the chemical properties of material placed within an energy stream. This stream of electrically loaded molecules causes an intensified reaction with the material resulting in better wettability and stronger bonding traits. Electrical surface treatment is highly suitable for three-dimensional polymer parts, thin film, rubber profiles, glass labware, metal parts, coated paperboard and thicker materials such as foam and solid sheets of material.

    When this phenomenon is contained inside an electrically grounded chamber, an air stream can be introduced to this chamber to force the plasma outwards in a controlled fashion and onto materials in a process called plasma treatment or atmospheric plasma treatment. However, when an insulator is placed between the two electrodes, the avalanche effect is avoided and the result is a cloud or arc of ionized air. This ionized air – Corona Discharge – can now be used for the surface treatment of a wide number of materials that show poor or no adhesion properties to media such as printing inks, adhesives, etc.


    multidyne corona treatment

                                             Illustration: Corona Treating Head

    What’s the Difference Between Corona & Plasma Treatment?

    Plasma discharge has a relatively narrow treating width but is capable of imparting enormous surface energies onto substrates.  Plasma has the added benefit of cleaning residue and contaminants from surfaces and even etches surfaces for the added benefit of increasing bonding with media. Plasma discharge is virtually potential-free so it can be used to treat conductive materials such as metal and alloys. 3DT’s PlasmaDyne systems offer a variety of types of plasma treating heads that can be quickly mounted onto existing lines with little setup. A unique benefit of our system is that the discharge level is adjustable for numerous applications. Plasma also produces no ozone gas which is a natural byproduct of the corona process.

    Alternatively, corona discharge typically imparts less surface energy but can treat large areas. Corona treatment also has the advantage of being able to treat inside parts or in the recesses of 3-dimensional parts. Both methods are very effective in functionalizing surfaces for better adhesion. Check out the video below.

    Our Most Popular Treatment Systems

    3DT designs and manufactures an extensive range of cutting-edge surface treatment products, including:

    multidyne MultiDyne™

    3DT’s MultiDyne™ corona treatment system creates optimal surface tension, or wettability, on a broad range of parts and materials. Featuring repeatable and process controlled operation,  MultiDyne™ is typically used to prepare blow molded, injection molded, and extruded parts and products. MultiDyne™ creates highly effective, uniform adhesion on surfaces for printing, coating, gluing, and lamination.

    MultiDyne™’s state-of-the-art corona discharge technology works by creating a short circuit between two high voltage electrodes. A constant flow of air between the electrodes facilitates even distribution of the corona field onto the surface of the treated material, creating a highly receptive adhesive surface. It is perfect for treating areas that are commonly a challenge for other surface treatments, including applications with complex geometries, hard-to-reach areas, and metal-adjacent surfaces.


    polydyne conveyer ceramic system for surface treatmentPolyDyne™ is one of 3DT’s most powerful corona treatment systems. This extremely dependable and reliable system is particularly useful in high-speed operations, such as printing, extrusion, assembly, and coating production lines. PolyDyne™ is exceptionally versatile and can be used to treat everything from the interior surface of needle hubs to automotive components. Using the latest technology, PolyDyne™ directs corona treatment with an exceptional degree of precision onto virtually any surface.

    PolyDyne™ is specifically designed with flexibility in mind. All of our systems can be customized to meet the particular needs of your application, including variety and number of treating heads, custom electrode systems, ozone eliminators, and material handling systems. For more resistant materials, we are pleased to offer our PolyDyne Pro™ system.

    PlasmaDyne Pro™

    PlasmaDyne Pro™ uses a stream of highly ionized plasma to modify the chemical properties of the surface material within the stream. The surface becomes functionalized and highly receptive to chemical bonding. This system also cleans and etches substrates for added bonding properties. PlasmaDyne Pro™ is unique within the industry because only 3DT’s technology offers adjustable treatment/power levels. This benefit increases treatment options regarding flexibility in substrates, parts, and treating modes all within one system.

    PlasmaDyne Pro™ enhances the adhesion of ink, paint and adhesive to a wide range of components, from plastic tubing and medical devices to rubber automotive seals and metal parts. 3DT’s PlasmaDyne Pro™ is a compact, versatile system, with an optimized control unit, the highest in treatment levels and modular replacement parts that facilitate non-stop production. PlasmaDyne Pro™ is completely customizable. Let’s discuss your application today!

    Premium Surface Treatment Systems by 3DT

    At 3DT, we are committed to developing superior surface treatment systems for every industry.  We have spent decades at the forefront of corona and plasma technology and are dedicated to solving even the most complex adhesion challenges. To learn more about our surface treatment systems and related services, visit our product page, or contact our experts today.



  5. Reviewing Surface Treatments: Decorating, Printing and Bonding on Plastic IS Possible

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    Plastics Decorating Magazine's Enews
    This plastic bottle has been plasma-treated in the center only. Note how the ink bonds to the surface where treated but beads up where the bottle was not treated.

    From Plastics Decorating Magazine’s Enews July 2020

    By Gary Kohlnhofer, Senior Sales Engineer, 3DT LLC

    Polymers have many useful properties, making them the material of choice. Polypropylene and polyethylene are prime examples. However, polymers typically have insufficient surface energy and poor wettability for most printing and bonding applications. Fortunately, corona and plasma surface treatment modify the surface of polymer substrates and raise their surface energy for printing, coating, painting and adhesive applications. As a result, the usefulness of polymers greatly increases for decorating and bonding applications.

    Let’s take a look at each of these methods of surface treatment, their applications and benefits:

    What is corona treatment?

    Corona treatment makes use of a generator and high voltage transformer to create a high voltage/high frequency corona discharge applied through an electrode with small airgap onto the surface to be treated. The result is a cloud of ionized air – or corona discharge – which then is used for the surface treatment of plastics and other materials.

    A substance placed under the corona discharge is impacted by electrons with energy two to three times that necessary to break the molecular bonds on the surface. The resulting free radicals rapidly react with the oxidation of products in the corona discharge or with adjoining free radicals on the same or different chain, resulting in a cross-link. Oxidation of the surface increases the surface tension or surface energy, allowing for better wetting by liquids and promoting adhesion.

    In the photo to the right, MultiDyne’s discharge treats ampules before printing.

    How is corona used in relation to plastics decorating?

    Corona treatment often is used inline on web-based printing machines, such as for treating label materials. Films such as polypropylene and polyethylene, for example, are treated inline prior to the digital printing decks to increase the surface tension and improve wettability and adhesion of digital inks. With these inline corona treating systems, the web is threaded over a treater roller and high voltage/high frequency power is applied to the electrode resulting in corona discharge through a small airgap. Corona treating systems also can be used on a high-speed cup decorating line, treating the cup on a mandrel prior to the printing decks.

    What types of applications or surfaces is corona treatment better suited for and why?

    Corona discharge effectively improves the surface tension on numerous materials that show poor or no adhesion properties to media, such as printing inks and adhesives.

    Reviewing Surface Treatments: Decorating, Printing and Bonding on Plastic IS Possible
    This MultiDyne system with two treating heads and a conveyor is designed for improving adhesion on small parts.





    Corona treating systems lend themselves to many applications, such as inline printing presses, but discreet parts can be treated as well with custom conveyor-based systems. A conveyor-based system using rotating electrodes treats different shapes and sizes without set up changes.

    These systems are very user-friendly and provide for uniform, repeatable surface treatment and high production rates. Individual parts also can be treated in fixtures with corona treatment delivered by custom electrodes and generator configurations.

    What are the benefits and challenges of this particular treatment?

    The benefits of the corona treatment process include the ability to print on substrates that otherwise would not be possible. Users also benefit from better print quality and faster printing line speeds, resulting in higher production and output.

    What is plasma treatment?

    Plasma surface treatment (also called in-air and atmospheric plasma) improves the wetting properties of polymeric materials, rubber, metals, glass, ceramics, paperboard and more. The molecules of these difficult-to-bond materials are modified by the plasma process to obtain better adhesion without causing harm to the surface.

    3DT's PlasmaDyne plasma treatment system. Rotating heads provides full coverage of a metalized plastic part.
    PlasmaDyne PRO rotating head treats a metallized plastic part to improve adhesion of ink/paint.

    Atmospheric plasma is created by combining reactive gas molecules and an electric field. This technology uses one or more high voltage electrodes which charge the surrounding blown gas molecules, resulting in a highly ionized field that is forced onto a targeted surface. This highly ionized air stream creates a thermal property that reacts with the substrate and breaks the existing hydrogen bonds by introducing oxygen which recreates the chemical properties of the surface. The atmospheric plasma process causes an intensified reaction with the material, resulting in better wettability, stronger bonding traits and micro-cleaned surfaces.

    How is it typically applied/integrated into the workflow?

    Plasma treating systems often are placed just prior to printing on inline printing production lines. The plasma treating head is mounted above a profile allowing the material to pass under the treating head and then the printing head improving the adhesion of the digital inks. Alternately, individual parts can be placed in a fixture then inserted into a plasma treating system set up to index the treating head back and forth over the parts, treating the top surface of the parts. Once treated, this fixture can be inserted into the digital printer for improved printability thanks to plasma treatment.

    PlasmaDyne PRO rotating head treats a metallized plastic part to improve adhesion of ink/paint.
    Here PlasmaDyne PRO is fitted to a robotic arm to quickly plasma treat defined areas of parts.


    What are the benefits and challenges of this particular treatment?

    Because atmospheric plasma is nearly potential-free, one important advantage is that plasma treatment can be incorporated into conductive, semi-conductive and non-conductive applications.

    Plasma is effective for cleaning surfaces by removing impurities, contaminants, residue and organic compounds. This process, called micro cleaning or etching, provides another important aspect in improving adhesion. What’s more, surface activation by plasma treatment is exceedingly fast, effective, economical and environmentally safe.

    What are 3DT’s surface treatment options for printing and decorating on plastics?

    3DT LLC provides a complete line of corona and plasma surface treating systems designed to overcome many adhesion challenges.  We offer standard and custom-built systems and application development.

    FlexiDyne Pro corona treatment system for labware and plastic parts.

    Our 3DT FlexiDyne PRO system is a conveyor-based corona treating system that utilizes rotating electrodes to provide a wider treat area and uniform, repeatable treatment with high production rates.

    In order to treat individual parts and profiles, we can provide a corona treating system using our 3DT PolyDyne generator and high voltage transformer technology and electrode system designed specifically for the part/profile to be treated.  Especially useful is our 3DT UltraDyne generator package designed for high speed cup and tube printing and decorating applications. UltraDyne provides consistent, strong high-frequency treating where other systems can’t.

    UltraDyne cup treater

    For surface treatment utilizing plasma technology, we offer our 3DT MultiDyne low frequency plasma system as well as our recently updated 3DT PlasmaDyne PRO system.  The PlasmaDyne PRO system with adjustable power output is especially suited for today’s system requirements to be easily adjusted for process changes.

    Custom PlasmaDyne PRO system

    Custom PlasmaDyne PRO system with 8 treating heads and individual adjustments.








    Gary Kohlnhofer has 38 years of experience in the plastics industry, 15 of those as Senior Sales Engineer with 3DT LLC. 3DT LLC is a manufacturer of surface treatment equipment, offering standard and custom-built systems and application development. Established in 1991, 3DT has been developing solutions for adhesion and bonding challenges for enumerable applications in all industry sectors. 3DT manufactures a complete line of corona and plasma systems incorporating robust design, proven technology and exceptional customer service with every standard and custom-engineered system. 3DT’s systems are designed and manufactured in Germantown, Wisconsin. For more information, visit

  6. Finding the Sweet Spot and the Right Corona Treater for Polypropylene

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    Corona treating is an efficient and cost-effective way of raising the wettability, bonding-properties, and surface tension of polypropylene products. Corona treatment can effectively improve bonding on a wide range of materials that show poor or no adhesion to media such as printing inks, paints, coating, and adhesives. Because of corona treatment’s flexible nature, it can even successfully treat tough-to-bond polymeric and elastomeric materials.


    MultiDyne is a versatile, cost-efficient low-frequency corona system.

    Unfortunately, corona treating is not without minor drawbacks. When treating polypropylene with low-frequency corona, small marks may be visible on the surface of the product after treating, which are referred to as “fish-marks.” These marks tend to appear more visible on glossy material than on matte materials. The reason they appear is due to the frequency at which the material is treated. Low-frequency corona treaters operate at a line frequency of 50 or 60 Hertz. This means it’s a common issue that ALL low-frequency corona treaters are subject to leave possible “fish-marks” on polypropylene.

    Fortunately, this problem can be mitigated in a number of ways, such as increasing the distance between treating heads and material being treated. Or increasing the line speed can be helpful in finding the “sweet spot,” where the necessary treatment is obtained with minimal spots appearing  on the surface.  Furthermore, the marks can be minimized when covered by printing, labeling, or applying adhesives.

    PolyDyne pro corona treatment

    PolyDyne Pro is a high-frequency generator that can power a multitude of systems.

    Finally, this problem can be avoided all together by using high-frequency corona treatment, if the process and geometry of the product permit. High-frequency systems require more product integration and handling and are typically more expensive due to their sophisticated design and components. With high-frequency corona treating, all adverse effects that come with low-frequency treating on polypropylene, such as fish marks, are avoided.

    Another option for improving surface energy and adhesion is plasma treatment. Plasma treatment is highly suitable for three-dimensional plastic parts and rubber parts and can be a viable, albeit pricier solution. Plasma treatment is also widely used on metal, ceramic and glass surfaces.

    3DT's PlasmaDyne plasma treatment system. Rotating heads provides full coverage of a metalized plastic part.

    PlasmaDyne Pro’s powerful plasma discharge.

    3DT offers all systems mentioned above; from the low-frequency, cost-efficient yet effective MultiDyne to high-frequency systems, including PolyDyne Pro, FlexiDyne Pro and UltraDyne. As well as the flexible, powerful PlasmaDyne Pro.

    All systems are offered as standard systems for numerous applications or customized for a specific application. Contact our expert sales team regarding your adhesion challenges!

    Email:  Phone: 1-262-253-6700

    UltraDyne provides consistent, strong, high-frequency treating where other systems can't.

    UltraDyne provides consistent, strong, high-frequency treating where other systems can’t.