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What is the compatibility of Polyvinylidene Chloride Printing Film with different inks?

by ernest•

What is the compatibility of Polyvinylidene Chloride Printing Film with different inks?

When I first started working as a Polyvinylidene Chloride (PVDC) printing film supplier fifteen years ago, I quickly learned that one of the most frequent questions from packaging converters and brand owners wasn’t just about the film’s physical properties—it was about how well it plays with inks. I remember a client calling me in a panic a few years back; their production line was down because the ink they’d chosen wouldn’t adhere to our PVDC film, and they were facing thousands of dollars in downtime. That experience stuck with me, because it taught me that even the best printing film in the world is useless if it can’t work seamlessly with the inks you’re using. Today, I want to break down exactly how PVDC printing film interacts with different ink types, what factors affect compatibility, and how we’ve worked with clients over the years to solve these common challenges. Polyvinylidene Chloride Printing Film

First, let’s get a quick refresher on what PVDC printing film is. Unlike polyethylene (PE) or polypropylene (PP) films, PVDC is a barrier polymer—meaning it’s designed to block moisture, oxygen, and other gases, which is why it’s so widely used in food packaging, pharmaceuticals, and specialty industrial goods. Its chemical structure gives it that great barrier, but it also makes it somewhat non-porous and chemically resistant, which is where ink compatibility can get tricky. The key to successful printing on any polymer film is surface energy. In simple terms, the film’s surface needs a certain level of energy to allow ink to wet out evenly, spread smoothly, and bond properly. If the surface energy is too low, ink will bead up, rub off (a problem called “scuff resistance”), or just not adhere at all. That’s why, as a PVDC film supplier, we always perform surface treatment on our films before they leave our facility—usually corona treatment—to raise the surface energy to a level that’s compatible with most commercial inks. But even with that pre-treatment, not all inks are created equal, and some will work better than others with PVDC.

Let’s start with the most common ink types used in flexographic and rotogravure printing, which are the main methods for printing PVDC films. Flexo is widely used for flexible packaging because it’s fast and cost-effective, while rotogravure is preferred for high-volume, high-resolution printing. The first ink type I want to talk about is solvent-based inks. For decades, solvent-based inks were the go-to for flexible packaging, and they do work surprisingly well with properly treated PVDC film. Solvent-based inks rely on organic solvents (like toluene, methyl ethyl ketone, or acetone) to dissolve the resin and pigments. When the ink is applied to the film, the solvents evaporate, and the resin sets, bonding to the film’s surface. The thing about PVDC is that its chemical composition has some polar groups, which interact positively with the polar resins in solvent-based inks. We’ve found that most standard solvent-based inks—especially those formulated for barrier polymers—adhere very well to our treated PVDC films, and they offer excellent color vibrancy and scuff resistance. That said, there’s a catch: some older solvent-based inks use solvents that are too aggressive, and they can actually cause the PVDC film to shrink or even dissolve slightly, which ruins the printing quality. That’s why we always advise clients to work with ink manufacturers that have experience with barrier films like PVDC; they’ll formulate their solvents to evaporate at the right rate without damaging the film. I’ve seen too many clients try to use generic solvent inks designed for PP or PE, and those have a higher chance of causing adhesion issues or film distortion.

Next up is water-based inks, which have become increasingly popular in recent years due to environmental regulations and sustainability goals. Now, here’s where compatibility with PVDC gets a bit more nuanced. Water-based inks use water as their carrier instead of organic solvents, so they’re much more eco-friendly, but they also pose a different set of challenges. PVDC is hydrophobic—meaning it repels water—and even with corona treatment, the surface can have a hard time wetting out with water-based inks if they’re not formulated correctly. Early on, a lot of our clients had issues with water-based inks on PVDC; the ink would bead, or when it dried, it would rub off easily. But over the past 10 years, ink manufacturers have made huge advancements in water-based ink technology, and today there are many water-based inks specifically designed for barrier polymers that work very well with our PVDC films. The key here is choosing a water-based ink with a high surface tension (or adjusting the ink’s additives with a surfactant) to help it spread evenly on the treated PVDC surface. We’ve tested dozens of water-based ink formulas, and we’ve found that those acrylic-based resins work best because they have the right polarity to bond with PVDC. We also recommend that clients run a small press trial before full production when switching to water-based inks; even the best ink might need a slight adjustment to the film’s surface energy (we can tweak our corona treatment levels to make that happen) to get perfect results. The big win with water-based inks is that they don’t have volatile organic compounds (VOCs), which is a huge plus for brands looking to reduce their environmental footprint. We’ve had clients in the snack food industry switch from solvent-based to water-based inks on our PVDC films, and they’ve not only met sustainability targets but also seen better ink adhesion in some cases—when the right ink is chosen, that is.

Then there’s the third major ink type: UV-curable inks. These are the ones that cure instantly when exposed to ultraviolet light, and they’re gaining traction for their fast drying times and low VOC content. How do they work with PVDC? That’s a question we get a lot, and the answer is: it depends. UV-curable inks rely on monomers and oligomers that cross-link when exposed to UV light, forming a hard, durable film. The problem with PVDC and UV inks is that some UV inks are too rigid, and when they cure, they can create adhesion issues because the PVDC film is flexible, and the cured ink doesn’t stretch with it. Also, some UV inks require a certain level of surface energy, and if the PVDC film’s surface is not treated enough, the ink won’t bond. But here’s the good news: over the last five years, UV ink manufacturers have developed flexible UV-curable inks that are specifically formulated for flexible barrier films like PVDC. These inks have a lower cross-linking density, so they stay flexible, and they’re designed to interact well with the treated PVDC surface. We’ve run extensive tests with these flexible UV inks, and we’ve found that when paired with our properly treated PVDC film, they offer amazing adhesion, scratch resistance, and color quality. The instant cure is a big benefit for production lines—it reduces the need for drying tunnels, speeds up turnaround times, and cuts down on energy use. That said, not all UV inks are created equal; we always advise clients to test UV inks on our PVDC film first before committing to full production. A few years back, a pharmaceutical client tried a generic UV ink on our film, and the ink flaked off during the lamination process. After switching to a UV ink designed for barrier films, the adhesion was perfect, and they’ve been using it ever since for their blister packaging.

Now, it’s not just the ink type that matters—there are other factors that affect compatibility between PVDC printing film and inks. Let’s talk about pretreatment, which is where we come in as a supplier. As I mentioned earlier, we do corona treatment on all our PVDC films before shipping, but the level of treatment (measured in dynes) can make a big difference. PVDC typically has a dynel level of around 38-42 dynes after treatment, which is the sweet spot for most inks. If the dynel level is too low (under 38), even the best ink will have adhesion issues, and if it’s too high (over 44), it can make the surface too polar, which might cause problems with certain inks that prefer a less polar surface. We also offer other surface treatments, like plasma treatment, for clients who need even higher surface energy for specialty inks. Another factor is the printing method. For example, rotogravure uses a thicker ink layer than flexo, so the ink needs to be able to penetrate and bond well with the film. We’ve found that certain high-solid inks work better for rotogravure printing on PVDC, while lower-solid inks are better for flexo. Also, the printing pressure and speed on the press can affect how the ink adheres; if the press is running too fast, the ink might not have time to wet out properly, and if the pressure is too high, it could damage the film’s surface.

Storage conditions also play a role. I know it sounds basic, but a lot of clients don’t realize that if our PVDC film is stored in a humid environment, or if it’s left in the warehouse for too long, the surface energy can degrade over time. When that happens, even the best ink might not adhere as well. That’s why we recommend that clients use the film within six months of purchase, store it in a cool, dry place away from direct sunlight, and check the dynel level of the film before printing if it’s been sitting for a while. We also provide dynel test kits with every shipment so clients can verify the surface energy themselves. On the other side, storing ink properly matters too: if water-based inks are left in a hot warehouse, their surfactants can break down, which affects how they interact with the film. I’ve seen clients store inks in the same hot area as our PVDC film, and that led to adhesion problems that were actually the ink’s fault, not the film’s. It’s a two-way street—both the film and the ink need to be handled correctly.

Let’s talk about real-world examples to make this concrete. A few years ago, we worked with a major frozen food brand that was having a lot of issues with their packaging. They were using solvent-based inks on a competitor’s PVDC film, and they were seeing a lot of ink rub-off after the packaging was sealed, which made the labels look messy and violated FDA regulations for food packaging. When they switched to our PVDC film, we recommended a solvent-based ink that was specifically formulated for barrier polymers, and we ran a press trial with them to adjust the dynel level to 40. The result? The ink adhesion improved by over 95%, and they haven’t had a single complaint in the past three years. Another example is a medical device company that needed a package that was both barrier-protective and had clear, durable printing. They initially tried UV-curable inks on our standard PVDC film, but the ink would flake during the sterilization process (ethylene oxide sterilization). We worked with an ink manufacturer to develop a flexible UV ink that was resistant to ethylene oxide, and we adjusted our plasma treatment to boost the surface energy to 43 dynes. That combination worked perfectly; the ink adhered through sterilization, and the packaging still provided the oxygen barrier the device needed.

Now, what about common mistakes to avoid? One big mistake we see clients make is using inks designed for other polymers, like PP or LDPE, on PVDC. Those inks are formulated to bond with different surface chemistries, so they almost always lead to adhesion issues. Another mistake is not doing a press trial. Even if an ink is supposed to work with PVDC, every press has different settings—speed, pressure, drying temperature—that can affect results. A small press trial costs a fraction of what a production shutdown costs, and it can save you a lot of headaches. Also, don’t ignore compatibility with post-print processes. A lot of PVDC films are laminated with other layers (like PE or aluminum foil) or coated with varnishes. The ink needs to not only adhere to the PVDC but also work with those post-print processes. For example, some inks will soften when exposed to lamination adhesives, which can cause peeling. We always advise clients to test the ink with their specific lamination or coating process when choosing an ink.

As a supplier, our job isn’t just to send you a roll of PVDC printing film—it’s to be a partner in your printing process. That’s why we offer technical support to every client, whether you’re a small converter or a large brand. We can help you select the right ink type based on your application (food packaging, medical, industrial), recommend ink manufacturers with proven experience in PVDC compatibility, assist with surface treatment adjustments, and even help set up press trials to make sure everything runs smoothly. We’ve invested in our own testing lab, where we test every batch of our PVDC film for surface energy, ink adhesion, and resistance to common inks, so we can give you accurate, reliable advice.

In conclusion, the compatibility between PVDC printing film and inks isn’t a one-size-fits-all equation. Solvent-based inks work well when they’re formulated for barrier polymers, water-based inks have become very reliable with recent advancements, and flexible UV-curable inks are a great option for eco-friendly, fast production. The key factors are proper surface treatment of the PVDC film, choosing ink types designed for this specific polymer, handling both film and ink correctly, and testing before full production.

Polyvinylidene Chloride Plain Film If you’re currently dealing with ink adhesion issues on your PVDC film, or if you’re looking to switch to more sustainable inks and want to make sure your film is compatible, we’re here to help. Our team has decades of experience working with converters and brand owners to solve printing challenges and find the right PVDC film and ink combination for your needs. Contact us today to discuss your requirements and find a solution that works for your production process.

References

  1. Handbook of Flexible Packaging Materials, 2nd Edition. Smith, J. (2019). Polymer Science Press.
  2. "Surface Energy and Ink Adhesion in Barrier Polymers". Technical Report, Polymeric Materials Association. (2021).
  3. Sustainable Inks for Flexible Packaging: Technology and Applications. Lee, S. (2022). Journal of Flexible Packaging Science.
  4. Corona Treatment for Polymer Films: Principles and Applications. Garcia, M. (2020). Industrial Coating Magazine.
  5. "UV-Curable Inks for Flexible Barrier Films". White Paper, Ink Manufacturers Alliance. (2023).

Sinosealed Packaging Solutions Limited
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