DTF Coating PET Film Formula

DTF Coating PET Film Formula is a practical PDF guide for printing-supply manufacturers, film converters, startups and entrepreneurs who want to produce their own coated PET film for Direct-to-Film (DTF) printing. In DTF printing, a design is printed onto a special film, covered with hot-melt adhesive powder, cured and then heat-pressed onto fabric. The film is the carrier that must accept ink cleanly, hold fine detail, survive curing heat and release the image on the garment. This page explains how a DTF coating PET film formulation works, what goes into a DTF coating PET film formula, how the coating is prepared, applied and tested, and how to turn it into a supply business.

This guide is published by Chemical Formulation Services, the formulation publishing and consultancy business of CFS Formulation Services Ltd in Sheffield, United Kingdom. It is written for people who want to understand the product from the raw material to the finished pack, and it keeps its claims practical rather than promotional.

How DTF film works

Direct-to-Film printing has grown quickly because it works on cotton, polyester, blends and many other fabrics without pre-treatment, and prints full colour with soft hand feel. The workflow has five steps. A printer prints coloured inks, followed by a white ink layer, onto a coated PET film. While the ink is wet, hot-melt adhesive powder is sprinkled over the print. The powder sticks to the wet ink only. The film is heated in an oven to melt and fix the powder. The film is placed on a garment and pressed with heat and pressure so the adhesive bonds to the fabric. After cooling or while warm, the PET film is peeled away, leaving the printed design on the fabric.

The film coating sits at the centre of this process. It must accept water-based pigment ink without bleeding, so that fine lines and small text stay sharp. It must hold the ink and powder through handling and curing. Then, when the transfer is complete, it must release the ink and adhesive cleanly, without leaving residue or tearing the design. Achieving both strong ink acceptance and easy release is a balancing act that coating formulators spend a great deal of effort on.

Structure of a DTF film

• PET base film: typically 75 micron (sometimes 100 micron) polyester film, clear or slightly matte, with good dimensional stability under heat. Surface treatment (corona) helps coating adhesion.
• Receptive coating layer: the formulated layer on top, which controls ink drying, dot gain, colour density and release.
• Back coating (optional): an anti-static or anti-curl layer on the back of some films for smooth feeding.

What goes into the receptive coating

• Binder resin: water-based polymer emulsions or solutions such as acrylic, polyurethane dispersion or polyvinyl-based resins give film strength, adhesion to PET and controlled release.
• Ink-receiving fillers: fine silica, alumina or calcium carbonate particles create micro-porosity that absorbs ink vehicle and speeds drying, preventing bleeding and smears.
• Release agents: silicone-based or wax-type additives, used at controlled levels to tune peel force. Too much release prevents ink anchoring, too little makes peeling hard.
• Crosslinkers: improve water and heat resistance of the coating.
• Surfactants and wetting agents: promote uniform coating on PET and ink wetting.
• Anti-static agents: reduce static that attracts dust and affects powder application.
• Defoamers and rheology modifiers: give a bubble-free coating and the right flow at the coater.
• Water or solvent: the carrier, normally water for eco-friendly systems.

Hot-peel, cold-peel and finish variations

DTF films come in several types, and the coating formula changes with each. Cold-peel films are allowed to cool to room temperature after pressing, then peeled; they give a clean, matte finish and are friendlier to temperature variation. Hot-peel films are peeled right after pressing, which speeds production, and they need a coating with lower peel force at high temperature. Glossy, matte and textured surfaces on the transferred print are created by the film’s surface structure, so a fine matte filler gives a soft matte print, and a smooth glossy layer gives a shiny print. Some special films give frosted, glitter, rainbow or leather-like effects. Offering two or three well-tested types suits most print shops and keeps production manageable.

Compatibility with printers, inks and powders

A film is only as good as its partners. Different printers use different print heads, and inks differ in surfactant content, pigment size and solvent. Powder particle size and melting point also differ. Test your film with the common DTF printer families, with several ink brands and with fine, medium and coarse powders, checking ink drying time, powder shaking, curing and transfer. Publish a compatibility sheet so customers know what to expect and what settings to use, such as printing resolution, ink volume and oven temperature. When a customer reports problems, ask about printer model, ink, powder, humidity and curing conditions before blaming the film.

Environmental conditions in the print shop

Humidity affects coated films strongly. In humid air, the coating absorbs moisture, ink spreads and bleeds, and powder clumps. In very dry air, static builds and powder sticks where it should not. Recommend storing film in sealed bags, using a dehumidifier or humidifier to keep room humidity within the range your tests support, and allowing film to acclimatise before use. Keep film away from sunlight and heat, which can warp it and degrade the coating. These simple practices make a major difference to customer satisfaction.

Rolls, sheets and packaging

Roll film is the standard for printers with roll-to-roll feeding, with cores of 3 inches (76 mm) common. Cut sheets such as A3 and A4 suit desktop printers. Wrap each roll in anti-static, moisture-barrier plastic, place in strong cartons and label clearly with width, length, film type, batch and manufacturing date. Include a short instruction card describing print side, recommended settings and storage. A sample roll with a printed test chart helps new customers evaluate quickly.

Costing and margins

Film cost is dominated by PET base. Coating chemicals add a small cost per square metre, so even a premium coating is a modest part of the price. Savings come from buying PET in large rolls, running the coater efficiently and minimising waste during start-up and slitting. Compare your cost per square metre with the retail price of branded DTF film, and ensure you can offer a competitive price without cutting quality. Track yield and scrap, and use reject film for testing rather than selling it.

What is inside the DTF Coating PET Film Formula guide

The guide, from Chemical Formulation Services (CFS), presents a high-performance formula designed for manufacturers who want to produce their own coated PET films for DTF printing. It describes a formula with excellent surface quality, then guides you through coating preparation, application, drying, converting, testing and troubleshooting.

How the coating is made and applied

Preparing the coating dispersion

Charge water and wetting agent to a mixing vessel. Add fillers slowly under high-speed dispersion until fully wetted and de-agglomerated. Blend in binder emulsion under slower mixing, followed by crosslinker, release additive, anti-static agent and defoamer. Adjust pH and viscosity. Filter the mixture to remove oversize particles.

Preparing the PET film

Use clean film free of dust and fingerprints. If the film is not pre-treated, apply corona treatment to raise surface energy so the coating wets and bonds.

Coating

Apply the coating using a gravure, Meyer rod, slot-die or reverse roll coater at a controlled wet thickness, to give a dry coat weight of a few grams per square metre. Even application is crucial, since streaks and thickness variation show up as print defects.

Drying and curing

Dry in an oven or hot-air tunnel at a temperature that removes water completely without distorting the PET. Cure the crosslinker as the supplier specifies. Cool and wind up under controlled tension.

Slitting and packing

Slit rolls to the width the printer needs, such as 30, 60 and 120 centimetres, and pack with desiccant in moisture-barrier wrapping. Store flat or on end to avoid core deformation.

Testing and quality control

• Coat weight and uniformity: weighing and thickness measurement across the web.
• Ink absorption and drying: print test patterns and check ink dry time, bleeding and dot sharpness.
• Colour density and white ink coverage: check opacity and vividness.
• Powder adhesion: uniform powder pick-up on the printed area only, no powder on clear areas.
• Heat stability: curing at about 100 to 130 degrees Celsius without curl or yellowing.
• Peel test: hot and cold peel after pressing, checking for clean release without ink left behind.
• Wash and stretch test: pressed transfers wash and stretch on test fabrics.
• Handling: static, curl, feeding through printers and cutting.

Troubleshooting

Ink bleeds or smears

Insufficient absorption. Increase filler porosity, adjust coat weight or change binder ratio.

Poor release, ink stays on the film

Not enough release agent or too much crosslinking. Increase release additive and balance cure.

Film releases too early or ink cracks

Too much release agent. Reduce release additive and increase binder.

Powder sticks to non-printed areas

Static or tacky coating. Add anti-static agent and adjust surface properties.

Curling after oven curing

Uneven coating or heat. Use balanced coating, lower oven temperature and use anti-curl back coat.

Streaks and uneven coating

Poor flow or dirty coater. Adjust viscosity, wetting agents and clean equipment.

Pinholes or craters

Contamination or foam. Filter, de-gas and add defoamer.

Safety and environmental practice

Water-based coating systems are comparatively safe, though crosslinkers (such as aziridine or isocyanate types) need careful handling with gloves and ventilation, and some are sensitisers. Powdered fillers like silica create dust, which should be controlled with extraction and masks. Dryers use heat and need guards and ventilation. Follow rules for waste water and coating residues. Provide safety data sheets and label rolls with storage instructions. The film itself is safe to handle but sharp edges and static can cause minor injuries.

Business opportunity

The DTF market has grown with print-on-demand shops, custom apparel businesses, merchandise printers, small garment decorators and online sellers. All of them consume film in rolls, powder, inks and cleaning solutions. A manufacturer can sell film in standard widths, offer cold-peel and hot-peel versions, matte and glossy finishes and film with special effects. Quality consistency is critical, since printers waste expensive ink and powder if the film performs poorly. Branded rolls with clear instructions, sample sheets and technical support generate repeat orders. The same customers also buy DTF inks, powder and cleaning fluids, so a producer can build a full range.

Related CFS guides help you build a DTF and printing supplies range. Browse the Ink Formulations and Coating Formulations categories, and see CMYKW DTF Printing Ink Formula, DTF Hot Melt Powder & Cleaning Solution Formula, Pigment-Based Sublimation Ink Formulation, Printing Ink Dispersion Formula, Screen Printing Ink Formula and Color Pigment Pastes Formula.

Getting started

Begin with small lab coatings on cut sheets of PET using a wire-wound rod. Print a standard test pattern on a DTF printer with your inks, apply powder, cure, press onto cotton and polyester, and evaluate detail, colour and peel. Compare with a leading commercial film and adjust the formula. Move to a pilot coating line or arrange toll coating, produce a few rolls, and send them to trusted print shops for feedback before launching.

How to get the best results from this guide

Treat the guide as a tested starting point rather than a finished factory. Begin with a small trial batch in the laboratory or on a bench, using the exact raw materials you plan to buy, and record every weight, temperature, mixing time and observation. Compare the result with the quality checks in the guide, change only one thing at a time, and keep a note of what each change did. Once a small batch is consistently good, repeat it several times, then scale up in stages, because mixing, heating and cooling behave differently in larger vessels. Keep retained samples of every batch, write simple standard operating procedures for your team, and build relationships with two suppliers for each key raw material. Finally, check the labelling, safety and product rules in the country where you will sell, and ask a qualified person to review your process. This careful, documented approach is what turns a good formulation into a reliable product and a trusted brand.

Who should buy this guide?

The guide is written for practical readers. It suits manufacturers who want to add a new product to an existing plant, startups choosing their first product, private-label brands that need to understand what they are buying, technical staff who must set specifications and train operators, and consultants and students who want a structured, plain-language reference. It is less suitable for anyone looking for a quick shortcut or a guarantee, because every formulation still needs testing with your own materials, equipment and local rules. If you are unsure whether it matches your project, send a short question through the contact page before you order, and we will tell you honestly whether it fits.

What is inside the DTF Coating PET Film Formula guide

Every Product Making Guide in our shop follows the same structure so you know where to look. This guide includes the product formula, the ingredients and materials, the procedure and preparations, the industrial requirements and the technical specifications. In practice you receive:

1. The formulation, written so you can follow it at the bench and scale it up.
2. Ingredients and materials, with the job of each material and advice on grades and suppliers.
3. The manufacturing procedure, including order of addition, mixing and preparations.
4. Industrial requirements, covering equipment, space and packaging.
5. Technical specifications, describing what a good finished product should look like and how it should behave.
6. Troubleshooting for the faults that makers meet most often.
7. Business guidance, to help you take the product from the bench to the market.

These Product Making Guides of chemical formulations and formulas are for manufacturers, startups and entrepreneurs. Every guide contains industrially tested, practical formulations. Anyone who buys a guide can make the product by following its step-by-step instructions. Raw materials vary between suppliers, so always confirm your results with a small trial batch before scaling up.

Who stands behind this guide?

Chemical Formulation Services is the trading name of CFS Formulation Services Ltd, registered in England and Wales under company number 16678503, with its office at Unit F, Winston Business Park, Churchill Way, Sheffield S35 2PS. The business was founded by George Enrick and publishes formulation manuals, technical guides and industry reports. You can check our details on the Companies House register, read about us, or contact us with any question before you order.

A written formulation cannot replace testing with your own raw materials, equipment and climate, and we say so plainly. What the guide does give you is a tested, structured starting point that can save you months of trial and error. Our terms and conditions explain what a purchase from us covers.

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Frequently asked questions about dtf coating pet film formula

What is the DTF Coating PET Film Formula guide?

It is a digital PDF Product Making Guide to the receptive coating on PET film for DTF printing, covering ingredients, coating, drying, testing and troubleshooting.

What does the coating do?

It accepts ink without bleeding, holds the powder and print through curing, and releases the design cleanly during transfer.

How do I balance ink hold and release?

Adjust the release additive, binder and crosslinker levels, and test hot and cold peel after pressing.

What film thickness is used?

Commonly 75 micron PET, although 100 micron is also used.

Do I need a coating machine?

You can start with lab rod coating, then move to a pilot coater or toll coating as volumes grow.

How do I receive the guide?

You receive an instant PDF download after payment is confirmed. For money exchanges, email your payment slip to Info@chemicalformulationservices.com and the link is emailed after we confirm it.

Is the payment refundable?

All payments are nonrefundable because the product is an instant digital download. See the refund policy for details.

Can you help with a custom formulation?

CFS Formulation Services Ltd offers formulation and product development consultancy. Send a short brief through the Contact page.

Last reviewed: November 2026. This page is general information about a digital product. It is not a safety data sheet or professional advice, and any formulation should be tested and reviewed by a qualified person before commercial use.