Screen Printing London, Ontario: Eco-Friendly Inks and Techniques Explained

Screen printing shops across London, Ontario have embraced greener materials and smarter production, not as a marketing trick but out of practical necessity. Clients ask for safer shirts for school events and corporate uniforms. The city’s small businesses want signs that last without leaving a trail of solvent waste. And shops themselves want cleaner air, fewer headaches, and processes that do not bog down staff with constant cleanup. Done right, eco-conscious choices often improve hand feel, print quality, and shop efficiency.

I run jobs that range from a few dozen camp tees to multi-hundred runs for local festivals near the Thames River. Over the past decade, our shop has dialed in low-VOC chemistry, smarter curing, and tighter controls around water use. The payoff has been measurable. We breathe easier, we reclaim screens faster, and we waste less ink and emulsion. The following is a practical guide to eco-friendly inks and production techniques that make sense in and around London, rooted in what actually holds up on press and out in the field.

What “eco-friendly” really means in a print shop

The term can mean many things, so it helps to anchor it to day-to-day decisions.

Fewer hazardous chemicals. Low-VOC, phthalate-free consumables reduce exposure during mixing, printing, and cleanup.
Lower energy use. Efficient flash and tunnel curing, plus low-temp ink systems, cut the hydro bill and carbon intensity.
Less water pollution. On-press practices and proper filtration stop solids and emulsion particles from heading down the drain.
Lower waste volume. Accurate ink mixing, good registration, and consistent mesh choices mean less scrap and fewer do-overs.

In Ontario, these choices sit within a workable regulatory context. The province’s electricity is a relatively low-carbon mix, with a large share from nuclear and hydro. That means every kilowatt you save is still worth saving, but your baseline footprint is already better than in regions that rely on coal. The Ministry of the Environment, Conservation and Parks expects proper handling of hazardous waste. That starts with the basics like labeling and storing spent solvents and ends with using a licensed hauler for pickup. Keeping this in mind, eco-friendly workflows become as much about organization and discipline as about which ink jug you buy.

Ink families that carry their weight

You can put almost any ink through a screen and get a decent print, once. The test is whether the ink holds up after fifty washes, whether it cures in real production windows, and whether it cooperates with the garments you actually see in London - cotton-heavy tees for charity runs, blends for campus merch at Western University, and technical fabrics for local sports leagues.

Here is the short list I come back to again and again when weighing performance against environmental impact:

Water-based inks. The backbone of greener garment printing. Modern water-based systems are stable on press for reasonable runs, give a soft hand on cotton, and release minimal odor. They need controlled humidity, especially in winter when indoor air runs dry, but you can manage that with simple tricks like a light misting bottle or a small humidifier near the press. Curing demands adequate dwell time and temperature, but with proper airflow you can push reliable results. The upside is big: breathable prints that feel like part of the shirt.
Discharge inks. Useful for dark, 100 percent cotton garments when you want that retail-soft feel. These remove the dye from the shirt and replace it with pigment. The quality can be spectacular, but the chemistry requires care and ventilation, and not all garment dyes discharge evenly. I keep discharge for special requests, limited color palettes, and garments I have tested.
PVC-free plastisol. Plastisol is popular because it prints easily and resists drying in the screen. Standard plastisol has PVC and phthalates unless specified otherwise. PVC-free, phthalate-free versions offer similar handling with less toxicity, and many now cure at lower temperatures. That single change cuts energy use at the dryer and reduces dye migration on polyester-heavy blends.
Silicone inks. A specialty tool for polyester and performance fabrics. They are extremely flexible and resist dye migration. The chemistry is pricier and more sensitive to shop conditions, so I use silicone when a client insists on high-stretch athletic prints or when I know a standard low-bleed system will not hold.
Specialty water-based products. High solids acrylic (HSA) water-based inks bridge the gap between classic water-based and plastisol. They sit on top a bit more, run longer on press, and still clean up with water-first methods. For shops moving off solvent-heavy plastisol cleaners, HSA can be a comfortable step.

A few truths cut across all of these. White ink is usually the slowest to cure, low-temp or not. Polyester wants cooler cure temps to prevent dye bleed, no matter what the label promises. And every claim on a data sheet assumes your dryer’s thermocouple and belt speed are honest, which is not always the case. I keep a calibrated infrared thermometer next to the press and I log test panels at the start of a run, not halfway through.

Matching ink to fabric, order size, and use case

The right choice shifts with garment content, print area, and target durability. For cotton tees for downtown events, water-based inks shine. You get a soft hand and breathable fabric, and the prints survive a full season of weekend wear. For mixed-fiber staff polos for hospitality venues along Richmond Row, I lean into PVC-free low-temp plastisol or silicone underbase with a water-based top if the art needs it. For polyester jerseys for youth leagues, silicone or low-bleed systems prevent dye creep that turns cool grey into pink.

For outdoor signage or event backdrops, you step out of garment inks and into large-format or UV-curable systems. Still, the same principles apply. Ask whether the substrate requires solvent-heavy adhesion, or if you can run a water-based ink for fabric banners and short-run indoor signs. Shops that list signs London Ontario in their services often balance screen printing with digital print to minimize setup waste for short runs. On a run of 20 coroplast signs, screen printing is still competitive when the art is single color and the substrate is consistent. On a run of 3, digital will waste less material.

The London climate and how it affects water-based printing

Humidity rules water-based ink behavior, and London winters are dry indoors. In January, relative humidity inside a heated shop can drop below 25 percent if you do not intervene. The result is ink drying in the screen, especially on fine halftones. Two practical fixes help:

Keep a small humidifier running near the press during long water-based runs. Target 40 to 50 percent relative humidity. Even a portable unit makes a noticeable difference in open time.
Print in a rhythm that avoids long idle periods with ink in the mesh. If a loader needs a pause, flood the screen and cover it with a light plastic sheet.

Summers can swing the other way. On muggy days, discharge activators can misbehave, and air-drying slows screen reclaim. Good airflow and a modest dehumidifier near your screen room solve most of that. None of these adjustments cost much compared to a single spoiled job.

Emulsion, exposure, and reclaim with fewer chemicals

Eco-friendly claims fall apart if your darkroom bleeds solvent at every step. Water-resistant, dual-cure emulsions give a strong stencil for both water-based and plastisol systems. They reclaim with lower-toxicity strippers when you do not overexpose or overcook them during reclaim. Two hard-won tips:

Expose for actual mesh and under-base opacity, not just what the chart says. If you see edge undercutting or gummy reclaim, your exposure is off. Perform a step wedge test whenever you change mesh supplier or humidity shifts significantly.
Use a proper emulsion hardener only when you need it, such as long water-based runs with aggressive scrub. Hardener saves you mid-run breakdowns, but it turns reclaim into a chore if used as a crutch.

For wastewater, a simple inline filter unit catches solids before they reach the drain. They are not glamorous, but they do the job. Replace cartridges or clean bags on schedule, and you will avoid sink clogs and surprises from your plumber.

Curing with less energy and more certainty

Dryer settings drift. Belts slip. Elements heat unevenly. I do not trust a dial without verification. When you move to low-temp plastisol or thick water-based inks, differences between stated and actual temperature matter. I confirm with:

A donut probe or wired thermocouple that reads garment surface temp.
A test grid of small swatches, marked with dwell time and belt speed, then stretch and wash tested.

For many low-temp plastisols, the cure window sits between 140 and 160 C, often 30 to 60 seconds, depending on ink deposit and airflow. Water-based systems might need similar surface temps but with longer dwell and forced air. If your shop runs on time-of-use electricity rates, schedule big curing windows in off-peak hours when possible. In London, that can make a dent in monthly costs without complicating your day.

Flash units are another place to save. Infrared flash set too high bakes the stencil, warps registration, and cooks more energy than you need. Smart practice is to flash just enough to gel the underbase, then let the main dryer do the heavy lifting. Once you bring disciplined timing to flashing, you see fewer scorched shirts and cleaner edges on halftones.

Detail work that lowers waste and lifts quality

I see the most impact from simple, repeatable habits:

Accurate ink mixing. Weigh, do not eyeball. Use small trial batches for custom Pantones before you dump half a liter of pigment you will never need again.
Mesh count discipline. The default for water-based solid areas might be 110 to 156, with 200 to 230 for halftones. Match mesh to detail, not what is already on the press. This reduces ink deposit, shortens cure time, and cuts hand feel.
Off-contact and squeegee hardness. Sharp, medium-hard squeegees lay less ink and improve edge definition. Fewer passes mean less penetration on thin garments and speedier curing.
Underbase strategy. On dark garments, a thin, high-opacity underbase flashed to a light gel supports top colors without piling on ink. That improves wash and cuts energy use.

Across a month of jobs, these small adjustments reduce misprints and reprints. That is less landfill and a quieter customer service inbox.

When to avoid discharge, foil, and other special effects

Eco-friendly does not mean never using effects. It means using them with judgment. Discharge on a black 100 percent cotton tee for a band that wants a vintage look can be perfect. On a poly blend or a garment with reactive dyes that fight discharge, it leads to uneven patches and more toss-outs. Foil transfers and high-density gels catch eyes on retail shelves, but they add plastic load and complicate recycling. I frame these as premium choices, not default options, and I quote them with longer lead times to allow for testing.

The economics of greener choices

Clients often ask whether water-based costs more. On paper, the ink per liter can be pricier than commodity plastisol, and setup is a touch slower. In practice, the math often evens out:

Lower ink deposit means less ink per shirt.
Shorter dryer dwell for low-temp systems saves hydro, which adds up on runs over a few hundred pieces.
Fewer shop chemicals reduce monthly supply orders.
Softer hand boosts perceived value, which helps pricing.

For a local nonprofit ordering 150 shirts for a 5K along the Thames Valley Parkway, the price difference between eco-leaning water-based and standard plastisol might be a few cents per unit if the art is simple and single color. The nonprofit gets breathable shirts that volunteers love wearing post-event, and the shop builds goodwill that leads to the next order. On large corporate runs, the margins shrink further because efficiency gains stack up.

Case snaps from London jobs that taught me something

A spring order for staff tees at a downtown café pushed us toward low-temp PVC-free plastisol. The garments were a 60/40 blend, the design was a small left chest and a back logo with fine lines. Water-based would have worked, but the café needed rush turnaround during a humid spell. Low-temp plastisol let us shorten the dryer dwell, preserve line quality, and avoid dye bleed. Wash tests at 10 and 25 cycles showed no cracking, and the café reordered within two months.

A summer festival near Victoria Park wanted soft-hand prints on black cotton totes. We sampled discharge and HSA water-based with a matching Pantone. The discharge looked great but off-gassed during curing, which raised ventilation concerns in a tight timeline. We switched to HSA water-based with a thin underbase, bumped mesh count to 156, and accepted a tiny difference in depth of black. The client could not tell, and our staff went home without sore throats.

A neighborhood sports club requested numbers on polyester jerseys, with a hard budget and small quantities across many sizes. We combined cut vinyl for numbers and a silicone ink front sponsor patch. The hybrid kept setup waste low and delivered migration-safe branding. It also gave the club a re-order path for one-offs when a new player joined mid-season.

Signage and graphics, with greener materials in mind

Plenty of London shops sit at the crossroads of screen printing and signs, so the conversation often spans both. For coroplast yard signs and simple A-frames, water-based poster inks perform well for indoor or short-term outdoor use. For longer exposure, UV-curable systems minimize solvents during print and cure fast, which keeps production efficient. Recyclability hinges on substrate choice more than ink. If a client promotes sustainability, I suggest aluminum composite panels for multi-year outdoor signs and fiber-based boards for indoor displays that need end-of-life options.

When clients search for signs London Ontario or graphics London Ontario, they often arrive with scattered needs: a small run of screen printed tees, a couple of banners, and some window decals. A shop that coordinates screen printing London Ontario with digital printing services London Ontario can route each item to the method with the least waste. Short-run decals go digital. Bulk tote prints with a single color go to screen. This mix lowers setup costs and material waste across the project.

A compact checklist for a greener shop day

Use this to keep the team aligned without bogging them down in theory.

Verify dryer temp against a test swatch before the first production run.
Choose the lowest ink deposit that will cover, starting with higher mesh and a sharp squeegee.
Stage water-based runs when humidity is manageable, and keep a humidifier near the press in dry months.
Mix only what you need, weigh your pigments, and label leftovers with date and Pantone.
Capture solids in reclaim with a filter, and store spent chemicals in labeled containers for proper pickup.

Working with clients who want sustainable options

Not every client asks for eco-friendly inks by name, but many care about outcome. They want shirts that do not feel plasticky, signage that does not reek of solvent, and a vendor who can explain trade-offs without jargon. I keep two or three standard routes ready:

Cotton merch with water-based inks for soft hand and breathable wear. I bring a sample printed six months prior to show aging honestly.
Blends or poly with low-temp PVC-free plastisol, tuned for migration resistance. I share wash test logs so clients see we test and verify.
Specialty jobs with a sustainability edge, such as HSA water-based on totes or fiber-based indoor signage.

The sales conversation is not about guilt. It is about fit. If a job timeline runs tight in February and the art has tiny type, I might steer away from pure water-based to keep quality consistent. Clients appreciate that kind of candor.

Training the team and tuning the room

Eco-friendly processes fall apart without staff buy-in. We run short refreshers every quarter. Fifteen minutes on reclaim best practices, a quick review of mesh choices for common jobs, and a reminder to log dryer tests. Small habits remembered save you the mess of a broken stencil mid-run or a cart of undercured shirts that come back after the first wash.

Room layout matters more than it gets credit for. Keep water-based ink mixing away from high airflow that dries screens too fast. Store emulsions in a cool cabinet, not next to the press. Place your filtration unit somewhere visible so cartridge changes are not forgotten. If you operate with a compact footprint, rolling racks and a labeled staging table keep wet prints away from dusty reclaim zones.

Sourcing in and around London

Local suppliers make experimentation easier. You can pick up a liter of a new low-temp white and test it the same afternoon. When you build a relationship with your supplier, you get early notice on reformulations and advice grounded in what other shops nearby have found. If a shop is serious about eco-friendly printing services London Ontario wide, it often shows in the back room, not the front desk: shelves labeled with phthalate-free, PVC-free marks, MSDS sheets easy to find, and a tidy waste corner awaiting pickup.

If you work with a contract printer or outsource specialty steps like foil or silicone transfers, ask blunt questions about their curing temps, solvents, and waste handling. Most will answer straight. Those conversations steer you to partners who will not surprise your clients later.

Mistakes I would make only once

I once tried to push a water-based metallic through a 110 mesh on a humid July afternoon without adjusting the dryer. It looked acceptable on press. Two weeks later, a string of shirts failed a stretch test that should have been done before boxing. Fix was simple in hindsight: slower belt, better airflow, and a bump to a higher-curing binder for that effect ink. The reprint stung, but the lesson stuck.

Another time, I over-hardened emulsion for a long water-based run and paid for it during reclaim. The screen fought me for an hour. Now, I only harden when the job truly warrants it and I test reclaim on a spare screen ahead of a big push.

These hiccups taught me to document. A small binder with dryer settings, mesh, squeegee notes, and ink type for repeat clients turns into a climate map for your shop. You see how January conditions differ from July, and you stop reinventing the wheel.

Where this leaves a London shop

Eco-friendly screen printing is not a single product switch. It is a series of choices that, together, change https://privatebin.net/?466df0d602982e36#9c5MR5TRx1rk1ZKJ3gC8ojieRk3ho1v34289MMpnUAJT the feel of your prints, the air in your shop, and the confidence you bring to tight deadlines. Start with an ink family that matches your bread-and-butter work, upgrade your curing verification, and put a filter under your reclaim sink. From there, refine mesh, squeegee, and underbase habits that reduce deposit and energy draw.

Clients searching for screen printing London Ontario care most about quality and reliability. If you show them samples that feel good and hold up, and you can explain why your process keeps waste down, they will choose you again. For those looking at graphics London Ontario or signs London Ontario, the same logic applies. Give them durable, good-looking work while choosing substrates and inks that do not turn your back room into a chemical stew.

Practical, verifiable steps beat big claims every time. Keep your logs, test your cures, and talk plainly about trade-offs. Do that, and eco-friendly stops being a buzzword and becomes the way you run a smart, resilient print shop.

Artcal Graphics & Printing — Business Info (NAP)

Name: Artcal Graphics & Printing

Address: 779 Industrial Rd, London, ON N5V 3N5
Phone: +1519-453-6010
Website: https://www.artcal.com/

Hours:
Monday: 8:00 AM – 4:30 PM
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https://www.artcal.com/

Artcal Graphics & Printing provides signage and graphic design services for businesses and organizations in London, Ontario and surrounding areas.

If you need custom signs, printed graphics, or design support for marketing materials, the team can help you plan the right format and finish for your project.

Common requests include business signage, interior and exterior graphics, vehicle or window graphics, and printed items used for promotions and day-to-day operations.

Artcal Graphics & Printing serves London and nearby communities throughout Southwestern Ontario.

Hours listed are Monday–Friday 8:00 AM–4:30 PM, with Saturday and Sunday closed.

For directions and listing details, use the map listing: https://maps.app.goo.gl/A2EZfwDigfcN14zA8

To request pricing or share artwork details, call +1-519-453-6010 or use the contact options on https://www.artcal.com/.

Landmarks Near London, ON

1) Victoria Park

2) Covent Garden Market

3) Budweiser Gardens

4) Western University

5) Fanshawe College

6) Springbank Park