What is Cold Transfer Process?
Cold transfer (also called cold foil transfer or cold foil stamping) is a process for applying holographic or metallic foils onto a substrate using a UV‑curable or pressure‑sensitive adhesive – without the need for heat. Unlike hot stamping (which uses a heated die), cold transfer relies on a printing press (typically flexographic or gravure) to print the adhesive in the desired pattern. The foil is then brought into contact with the adhesive, and a UV lamp instantly cures the adhesive, bonding the foil to the substrate. The carrier film is peeled away, leaving the holographic image. Cold transfer is ideal for heat‑sensitive materials (thin plastic films, labels, shrink sleeves), for high‑speed inline production (up to 150 m/min), and for lower setup costs (no engraved dies). It is widely used in flexible packaging, self‑adhesive labels, folding cartons, and commercial printing. Holoseal supplies custom holographic cold transfer foils and advises on adhesive compatibility and process parameters for optimal results.
🔬 How the Cold Transfer Process Works (Step‑by‑Step)
The process is typically integrated inline on a flexographic or gravure printing press. Here are the stages:
1. Adhesive Printing
A printing unit (flexo or gravure) applies a thin layer of UV‑curable adhesive onto the substrate in the exact pattern where the hologram should appear. The adhesive can be applied as a solid area, fine lines, or text, depending on the design.
2. Foil Lamination
A roll of holographic cold transfer foil (carrier + release layer + hologram + adhesive receptive coating) is brought into contact with the printed adhesive. The foil is pressed against the substrate using a rubber nip roller – no heat is applied.
3. UV Curing
The substrate passes under a UV lamp. The UV light penetrates through the foil (the carrier and hologram layer are UV‑transparent) and cures the adhesive instantly (in milliseconds). The adhesive hardens, bonding the foil firmly to the substrate.
4. Carrier Peeling
The carrier film is peeled away, leaving the holographic layer only in the areas where adhesive was printed. The unused foil remains on the carrier and is rewound as waste.
5. Overprinting (Optional)
Additional printing units can apply opaque inks over the foil (e.g., to cover unwanted areas) or add variable data (serial numbers, barcodes) after the cold transfer step.
📦 Types of Cold Transfer Foils
- Holographic cold transfer foils – Contain a diffractive grating (rainbow, 2D/3D, DOVID). Used for security and decorative applications.
- Metallic cold transfer foils – Gold, silver, copper, and other metallic finishes without holographic effect.
- Pigment cold transfer foils – Opaque white, black, or coloured foils for special effects.
- Scratch‑off cold transfer foils – For lottery tickets and promotional labels.
🆚 Cold Transfer vs. Hot Stamping
| Aspect | Cold Transfer | Hot Stamping |
|---|---|---|
| Heat required — | No – UV curing only— | Yes – heated die (100–150 °C) |
| Substrate suitability — | Heat‑sensitive materials (thin films, labels, shrink sleeves)— | Heat‑resistant materials (paper, cardboard, some plastics) |
| Tooling cost — | Low – only printing plates (no engraved die)— | High – engraved die required |
| Speed (inline) — | Very high – up to 150 m/min, full press speed— | Moderate – separate stamping unit, slower |
| Edge definition / resolution — | Good – slightly less sharp than hot stamping due to adhesive flow— | Excellent – very sharp edges |
| Durability — | Good – depends on UV adhesive and top coat— | Very good – strong bond under heat |
| Liner waste — | Yes – carrier film waste— | Yes – carrier waste (but no release liner) |
🔐 Advantages of Cold Transfer for Holographic Applications
- Heat‑sensitive substrates – Ideal for thin films (PET, PP, PE), shrink sleeves, and labels that would distort under heat.
- High speed – Can run at full press speed (50–150 m/min) integrated with printing.
- Low setup cost – No expensive engraving; only printing plates (flexo or gravure).
- Design flexibility – Adhesive can be printed in any shape, including fine lines and small text.
- Inline variable data – Easily combine with digital printing for unique QR codes or serial numbers after foiling.
⚙️ Typical Applications of Cold Transfer Holograms
- Flexible packaging (pouches, wrappers) – Holographic logos on snack bags, coffee pouches, and frozen food packages.
- Self‑adhesive labels – Product labels for cosmetics, beverages, and consumer goods.
- Shrink sleeves – Full‑sleeve holographic designs for bottles and containers.
- Folding cartons (luxury goods) – Cold transfer is used on thinner paperboard where hot stamping might cause scorching.
- Commercial printing (brochures, business cards) – Spot holographic effects on heat‑sensitive stocks.
🌍 Holoseal’s Role in Cold Transfer
We are a supplier of custom holographic cold transfer foils and can advise on adhesive selection, UV curing parameters, and foil handling. We provide the foil with your custom hologram design (rainbow, 2D/3D, DOVID) and ensure compatibility with UV adhesive systems. With 15+ years of experience, we help clients choose the right foil release and adhesive receptive coating for their specific press and substrate. We serve label converters, flexible packaging printers, and security printers across India and worldwide.
❓ Frequently Asked Questions About Cold Transfer
- Can cold transfer be used on paper or cardboard? – Yes – it works well on coated paper and paperboard. However, hot stamping is often preferred for its sharper edges and higher durability on rigid substrates.
- Do I need a special UV lamp? – Yes – a standard UV curing system (mercury or LED) is required. The UV must penetrate the foil, so the foil must be UV‑transparent. Holoseal supplies foils designed for UV transmission.
- Is cold transfer as durable as hot stamping? – For most label and flexible packaging applications, yes. For high‑abrasion environments (e.g., banknotes, ID cards), hot stamping is more durable.
- Can cold transfer produce VOID tamper‑evident patterns? – It is possible, but hot stamping is more common for VOID because the heat‑activated adhesive creates a stronger tamper link. Consult Holoseal for custom solutions.
- How to order custom cold transfer holographic foils from Holoseal? – Provide your artwork, desired foil width, substrate type, and quantity. We will create a custom hologram master, produce the foil, and supply technical data for your UV adhesive system. Contact us for a quote.
