What is a Release Liner? Silicone Paper Backing
A release liner (also called backing paper, release paper, or silicone liner) is a sheet or roll of paper or PET film that is coated with a thin layer of silicone on one or both sides. It serves as a protective backing for self‑adhesive products, such as hologram labels, stickers, tapes, and medical plasters. The silicone coating provides a non‑stick surface that allows the adhesive label to be easily peeled off without damaging the adhesive or the label. The release liner is discarded after the label is applied. In the context of hologram labels, the release liner is an essential component: it keeps the label clean and protected during storage and shipping, and ensures that the label can be smoothly dispensed by automatic labelling machines or peeled off by hand. Without a release liner, the adhesive side of a hologram label would stick to everything – including the back of the next label – ruining the roll. Release liners are made from either paper (most common for hologram labels) or PET film (for clear, ultra‑smooth liners used in high‑speed applicators).
At Holoseal – a trusted hologram supplier with 15+ years of experience – we select the appropriate release liner for each hologram label order based on the label size, adhesive type, and application method (hand or machine). We supply label rolls ready to use on your existing dispensers. We serve clients across India and worldwide, including Mumbai, Delhi, Bengaluru, Chennai, Hyderabad, Pune, Ahmedabad, Kolkata, Surat, Kochi, Jaipur, Lucknow, Nagpur, Indore, Vadodara, Ludhiana, Patna, Guwahati, Chandigarh, and more.
🔍 Why a Release Liner Is Essential for Hologram Labels
- Protects the adhesive – Keeps the adhesive clean and uncontaminated until the moment of application.
- Prevents self‑adhesion – Without a liner, the sticky side of a label would stick to the back of the label above it on the roll, ruining the roll.
- Enables automatic dispensing – Modern label applicators peel the label from the liner at high speed; the liner is rewound and discarded.
- Provides rigidity – The liner gives the label roll strength, preventing curling and allowing stable stacking.
- Supports die‑cutting – The liner is cut through (kiss‑cut) or left intact; it holds the labels in place during slitting and packaging.
⚙️ Types of Release Liners Used for Hologram Labels
- Paper release liner (silicone coated paper) – Most common. Made from kraft paper, glassine paper, or clay‑coated paper. It is economical, stiff enough for good handling, and recyclable. Used for standard hologram labels on bottles, boxes, and envelopes.
- PET film release liner (silicone coated polyester) – Clear, ultra‑smooth, and very strong. Used for very small labels, high‑speed automatic applicators, or transparent labels. More expensive but provides better stability.
- Single‑sided silicone liner – Silicone coating on one side only. The adhesive side of the label contacts the silicone side; the other side is untreated. Standard for most self‑adhesive label rolls.
- Double‑sided silicone liner – Silicone on both sides. Used for transfer tapes or double‑sided labels (where the label is removed from both sides). Rare for standard hologram labels.
- Coloured release liners – Some liners are blue, green, or red to indicate special adhesive properties (e.g., medical grade, high‑tack). Holoseal uses natural or white liners for most orders.
🛡️ Properties of a Good Release Liner
- Release force – The liner must release the label with consistent, not too high nor too low force. Too low and the label falls off during shipping; too high and it cannot be applied automatically.
- Caliper (thickness) – Typically 50–150 microns for paper liners, 25–75 microns for PET liners. Thicker liners are stiffer and easier to handle on large rolls.
- Smoothness – A smooth liner ensures even adhesive coating and prevents “orange peel” texture on the label.
- Die‑cutting compatibility – The liner must be strong enough to not tear during kiss‑cutting, yet flexible enough to allow the label matrix to be stripped.
- Silicone adhesion – The silicone must be well‑anchored to the liner so it doesn’t transfer to the adhesive (which would reduce tack).
🔐 How Release Liners Are Made
- Base paper or film preparation – A master roll of paper (e.g., glassine) or PET film is loaded onto a coating line.
- Silicone coating – A liquid silicone mixture (solvent‑based or solvent‑free) is applied to the paper using a gravure roller or slot‑die. The silicone is then cured (heated or UV‑cured) to form a permanent non‑stick layer.
- Optional backside treatment – The backside may be coated with an anti‑static layer or a release agent for double‑sided liners.
- Slitting – The master liner roll is slit to the required width for the label converting process.
📦 Release Liner Waste and Disposal
After applying the hologram label, the release liner is typically discarded. Paper liners can be recycled if local facilities accept silicone‑coated paper (many do, as the silicone is minimal). PET liners are recyclable in specialised plastics recycling streams. Holoseal supports sustainable practices by recommending the thinnest practical liner to minimise waste and by offering liner‑free label options (e.g., hot stamping foils) where appropriate.
🌍 Holoseal’s Release Liner Selection for Hologram Labels
We offer custom‑converted hologram label rolls with release liners matched to your application needs:
- Standard paper liner – For most hand‑applied and automatic labelling applications. Provides good stiffness and reliable release.
- PET clear liner – For very small labels (under 10 mm) or high‑speed machines (e.g., 500+ labels per minute).
- Easy‑peel split liner – A liner with a split line that allows the label to be folded and applied without touching the adhesive (used for medical labels).
- Linerless labels (alternative) – For customers who want to eliminate liner waste entirely; we advise on linerless technology limitations.
With 15+ years of experience, we help you specify the correct liner caliper, release force, and width to ensure smooth operation on your dispensing equipment.
❓ Frequently Asked Questions About Release Liners
Can I recycle the release liner after using the hologram label?
Paper release liners are often accepted in mixed paper recycling streams, though some facilities reject silicone‑coated paper. Check with your local recycling program. PET liners are recyclable where PET plastic is accepted. We encourage reducing waste by choosing linerless labels where feasible.
Why does the release liner sometimes curl after the label is removed?
Curling happens when the liner’s coating or tension is uneven, or when the liner is stored in a humid environment. We use high‑quality liners and proper storage to minimise curling. If you experience this, try storing label rolls in a cool, dry place (20–25°C, 50% RH).
What is the difference between “kiss‑cut” and “through‑cut” release liners?
In kiss‑cutting, the die cuts only through the label material, leaving the liner intact. The labels remain on the liner in a roll. In through‑cutting, the liner is also cut, resulting in individual loose labels (no liner). Most self‑adhesive hologram labels are kiss‑cut.
Can I get a release liner with printed markings (e.g., for registration)?
Yes – we can supply liners with printed guide lines, registration marks, or even your logo (on the non‑silicone side). This is common for automatic label applicators that need to detect label pitch.
What is the typical release force for a hologram label liner?
Release force varies by adhesive type: permanent adhesives typically need 10–30 g/25 mm of peel force; removable adhesives may require 5–15 g/25 mm. We adjust the liner choice to match your adhesive and dispenser.
How to order hologram labels with the right release liner from Holoseal?
Specify your label size, adhesive type, application method (hand or machine), and any special liner requirements (e.g., coloured, split liner). We will recommend and supply the optimal release liner. Contact us for a quote.
