What is a Hologram Coating Machine? Adhesive Application
A hologram coating machine is a specialised industrial machine used to apply a uniform layer of pressure‑sensitive adhesive (PSA) onto the back of holographic film, turning the non‑adhesive film into a self‑adhesive hologram label stock. The machine also simultaneously laminates the adhesive‑coated film with a silicone‑coated release liner (the backing paper) so that the final roll can be unwound easily on label applicators. Without coating, the holographic film would be just a shiny sheet – not a sticker. The coating process ensures that the adhesive is applied at the correct thickness (typically 10–30 microns), with no bubbles, streaks, or uneven areas. Poor coating leads to labels that peel off prematurely, leave residue, or fail to stick at all. Hologram coating machines are part of the converting line after the holographic film has been embossed, metalized, and optionally printed. They are essential for producing millions of self‑adhesive hologram labels used on pharmaceuticals, electronics, FMCG, and automotive parts.
At Holoseal – a trusted hologram supplier with 15+ years of experience – we work with advanced coating lines to produce self‑adhesive hologram label rolls. Our adhesives are selected based on the end‑use: permanent, removable, cold‑temperature, or tamper‑evident (VOID). We serve clients across India and worldwide in Mumbai, Delhi, Bengaluru, Chennai, Hyderabad, Pune, Ahmedabad, Kolkata, Surat, Kochi, Jaipur, Lucknow, Nagpur, Indore, Vadodara, Ludhiana, Patna, Guwahati, Chandigarh and more.
🔍 Why Hologram Coating Machines Are Critical
- Adhesive uniformity – Thickness variations cause labels to have weak edges or oozing adhesive, leading to applicator jams.
- Release liner lamination – The machine precisely bonds the coated film to a silicone liner, allowing easy peeling without damaging the hologram.
- Custom adhesive selection – Different applications need different adhesives: permanent for electronics, removable for temporary labels, high‑tack for cold environments, or VOID for tamper evidence.
- Speed and efficiency – Coating machines run at 50–200 metres per minute, enabling high‑volume production of self‑adhesive hologram rolls.
⚙️ How a Hologram Coating Machine Works (Step‑by‑Step)
- Unwind of holographic film – The master roll of embossed, metalized holographic film is loaded onto the unwind station. The film may have been pre‑printed with serial numbers or UV features.
- Adhesive application – The film passes under a coating head where liquid adhesive (solvent‑based, water‑based, or hot‑melt) is applied. Common coating methods: gravure roller (patterned roller picks up adhesive), slot die (precision slit deposits adhesive), or comma coater (blade sets thickness).
- Drying or curing – For solvent or water‑based adhesives, the coated film passes through a long heated oven (up to 20 metres) to evaporate solvents. For hot‑melt adhesives, cooling rollers solidify the adhesive.
- Release liner lamination – A silicone‑coated paper or PET liner is unwound and pressed onto the adhesive layer using a laminating nip roller. The liner protects the adhesive until application.
- Rewinding – The finished self‑adhesive hologram roll is rewound onto a core. It is then sent to slitting and die‑cutting to produce individual labels.
🛡️ Types of Coating Methods Used for Hologram Labels
- Gravure coating – An engraved roller transfers a precise amount of adhesive. High speed, best for uniform thickness on smooth films. Common for large runs.
- Slot‑die coating – Adhesive is pumped through a narrow slot directly onto the film. Extremely precise, minimal waste, ideal for expensive adhesives (e.g., tamper‑evident).
- Comma / knife‑over‑roll coating – A blade (comma roll) sets the adhesive thickness. Simpler, good for thicker adhesives.
- Hot‑melt coating – Solid adhesive is melted and applied as a hot liquid, then cooled. No drying oven needed. Fast, but limited to certain adhesive types.
📦 Adhesive Types Used on Hologram Labels (Applied by Coating Machines)
- Permanent acrylic adhesive – Strong bond, weather‑resistant, non‑yellowing. Used for outdoor electronics, auto parts, and long‑term labelling.
- Removable (repositionable) adhesive – Allows labels to be peeled and repositioned without residue. Used for temporary promotions, price stickers.
- High‑tack rubber adhesive – Extremely aggressive, bonds quickly to rough or low‑energy surfaces (e.g., polypropylene bottles). Used for pharma and industrial labels.
- Cold‑temperature adhesive – Remains sticky below freezing. Used for frozen food packaging and cold‑chain medicines.
- Tamper‑evident (VOID) adhesive – Specially formulated to leave a “VOID” pattern when the label is removed. Requires precise coating thickness to activate correctly.
🔐 Quality Control on Coating Lines
Holoseal ensures every coated roll meets strict standards:
- Coating weight measurement – Using a beta gauge or laser sensor to check adhesive thickness (typically 15–25 g/m²).
- Visual inspection – Automated cameras detect streaks, bubbles, or missing adhesive.
- Peel adhesion test – A sample label is applied to a standard steel plate and peeled at 180°. The force must match the specified range.
- Release liner peel test – Measures the force needed to remove the liner. Too easy and the liner falls off prematurely; too hard and the label cannot be applied automatically.
🌍 Holoseal’s Coating Capabilities
We work with dedicated converting facilities that operate modern coating lines. For clients in India and worldwide, we provide self‑adhesive hologram label rolls with custom adhesive formulations. Our team helps select the right adhesive, coating method, and liner release level based on your substrate (paper, plastic, glass, metal) and application conditions (indoor, outdoor, cold storage). With 15+ years of experience, we guarantee consistent coating quality across every roll.
❓ Frequently Asked Questions About Hologram Coating Machines
Can any hologram film be coated with adhesive?
Yes – all non‑adhesive hologram films can be coated. However, the film surface must be compatible with the adhesive (e.g., corona‑treated for better adhesion). We test compatibility before bulk coating.
What is the typical adhesive thickness on a hologram label?
For permanent labels, 15–25 microns. For removable labels, 12–18 microns. For cold‑temperature, 25–35 microns. The coating machine can adjust within ±2 microns.
Does coating affect the hologram’s rainbow effect?
No – the adhesive is applied on the reverse side of the film (the non‑embossed side). The holographic image remains unaffected and visible from the front.
How long does a coated hologram label roll last in storage?
Typically 1–2 years when stored in a cool, dry place (20–25°C, 50% RH). After that, the adhesive may lose tack or the liner may become difficult to remove. We provide shelf life recommendations with each batch.
Can I order small quantities of coated hologram film for testing?
Yes – we offer sample rolls (e.g., 200 metres) for customer testing on their label applicators. Contact us to arrange a trial.
How to order coated hologram label rolls from Holoseal?
Specify your hologram design, required label size (or master roll width), adhesive type (permanent, removable, cold, VOID), and substrate (e.g., glass bottle, cardboard box). We will coat a sample roll for your approval before mass production. Contact us for a quote.
