Glassine Release Paper Double Sided
A double-sided glassine release paper carries a silicone release coating on both faces of a dense, supercalendered glassine base paper. It is used where a liner has to protect adhesive on both sides at once — most commonly in double-sided tape, adhesive transfer film and rotary die-cutting. Two things decide whether it works, and neither is the word "double". The first is differential release: on most double-sided constructions the two faces should not release at the same force. One face has to hold while the other lets go, or the tape unwinds wrongly at the point of application. The second is whether the glassine is dense enough that the adhesive never migrates through to the opposite face. This page covers both — and what you should specify before ordering.
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Product Introduction
What "Double Sided" Actually Means on a Release Paper
A double-sided (two-side) release liner is coated with release agent on both faces of the same substrate. It is not the same thing as two single-sided liners, and it is not the same thing as a "both side" paper where both faces happen to be coated identically.
Three different products get confused under the same words:
| Term | What it means | Typical use |
|---|---|---|
| Single-sided liner | Release coating on one face only; the other face is printable or adhesive-receptive | Labels, tapes, envelope strips |
| Double-sided liner, same release | Both faces coated with the same release level | Protection on both sides; simple interleaving |
| Differential release liner | Both faces coated, but with different release levels or coat weights on each face | Double-sided tape, transfer adhesive, die-cutting |
Differential Release: Why the Two Faces Are Usually Not the Same
In a double-sided tape, the adhesive is sandwiched between two liner faces. When the tape is unwound and applied, one face has to release first and the other has to hold long enough for the tape to be positioned.
If both faces are equally easy, the tape releases from the wrong side, or from both sides, before it reaches the substrate.
If both faces are equally tight, the operator fights the tape, or the adhesive is pulled off the tape body.
A differential liner solves this by giving each face its own release level - typically one easy face and one tighter face - set by using different silicone formulations or different coating weights on the two sides.
What to tell us so we can set it correctly:
| Information | Why it matters |
|---|---|
| Tape construction (adhesive type on each face) | Rubber, acrylic and hot-melt adhesives release differently on the same coating |
| Unwind direction and application method | Decides which face must be the easy one |
| Line speed | Very high speeds generally need a tighter release |
| Required release difference | Expressed as a ratio or as two separate peel values |
What to Specify on a Double-Sided Glassine Liner
| # | Item | Typical question |
|---|---|---|
| 1 | Base paper type | glassine (supercalendered) - confirm against your sample |
| 2 | Coating system | solvent-based / solvent-free |
| 3 | Barrier or PE layer needed? | only if adhesive migration is a risk |
| 4 | Slit width + tolerance | Can customs |
| 5 | Core, roll diameter, roll length | 3" or 6" |
| 6 | Colour | white / yellow / ginger / brown |
Glassine as the Substrate: Why Density Matters Twice
On a single-sided liner, the glassine base mainly decides how much silicone you need. On a double-sided liner it has a second job: it has to keep the two adhesive layers apart.
Glassine is a supercalendered, highly dense paper made from virgin pulp. That density gives two benefits here:
Silicone hold-out. A closed, dense surface stops the silicone from sinking into the paper, so less coat weight is needed for the same release - and the release stays more consistent across the roll.
Barrier against adhesive migration. A denser sheet resists adhesive and plasticiser migrating from one face to the other during storage. On thin, porous papers this migration is a real failure mode; on a dense glassine it is much less likely
If you are running a very low grammage glassine and your adhesive is aggressive, ask about a barrier option rather than assuming paper alone will hold.
Silicone Coating: Coat Weight, Uniformity and Rub-Off
Release force is only half the story. Three coating properties decide whether the liner behaves in production:
Coat weight per face. Too low and the release drifts as the liner ages; too high and release becomes tight and the cost rises. Coat weight should be stated per face, in g/m² .
Uniformity. A liner that releases at one force in the middle of the web and another at the edges cannot be used for high-speed die-cutting. Uniformity is verified by measuring coat weight across the web.
Anchorage / rub-off. Silicone that is not properly cured can transfer onto the adhesive. This is the classic silent defect - the label or tape performs normally in test and fails months later in the field. Ask for a silicone rub-off result, not just a release force figure.
Can the Paper Stop the Adhesive? Soak-Through and Blocking
Two failure modes unique to double-sided liners:
Soak-through. Adhesive or plasticiser migrates through the paper and contaminates the opposite face. The symptom is a liner that releases correctly on one face and grabs on the other.
Blocking. When the liner is wound into a roll, the two coated faces press against each other. If both faces are very easy, the roll can block and will not unwind cleanly.
Mitigations, in order of preference: a denser base paper → a slightly tighter coating on the face that touches the roll → a barrier layer (PE or clay coating) for aggressive adhesives .
Always tell us the adhesive type. A liner that performs perfectly with an acrylic adhesive can fail with a rubber-based or hot-melt adhesive on the same construction.
Application Guide
Double-sided tape
Adhesive on both faces of a carrier; a differential liner lets the tape unwind without lifting the wrong side
**tell us the unwind direction
Adhesive transfer film
Adhesive has no carrier of its own, so it must be supported on both sides
**differential release is essential here
Photovoltaic & composite materials
Release during lamination and lay-up
**heat exposure may apply
Rotary die-cutting / converting
Liner must hold through the die-cut and release cleanly afterwards
**check coat weight uniformity
Medical patches & adhesive dressings
Controlled, consistent release on both faces
**certification requirements apply
Foam tape & gaskets
Thick adhesive needs a liner that resists soak-through
**check barrier need
Electronic & reflective materials
Clean release with no silicone transfer onto functional surfaces
**ask for rub-off data
How to Test a Double-Sided Liner Before You Commit
| # | Test | What to look for |
|---|---|---|
| 1 | Release force, both faces | measured on your adhesive, at your speed - not on a standard test tape only |
| 2 | Release difference | is the difference large enough to control unwind direction? |
| 3 | Silicone rub-off | rub the coated face with your thumb or a tape pull; no smear, no dull patch |
| 4 | Soak-through / migration | laminate your adhesive, age at elevated temperature, re-test both faces |
| 5 | Unwind / blocking | wind a roll and leave it; it must unwind cleanly without tightening |
Why Weshare
Release liner and coated paper production in Hangzhou, Zhejiang, since 2005, with 4 hot-melt coating lines, 1 adhesive coating line and 2 coated-paper and silicone coating lines.
Our own laboratory acts as the R&D base; a retained sample is kept for 2 years on every order, and a test report ships with each order.
We work with leading Chinese paper mills and use imported Japanese base paper alongside domestic high-grade paper for single- and double-sided silicone coating.
Release liner paper supply up to 2500 mm wide, so custom slit widths do not require a new base paper order.
Hangzhou Weshare Imp. & Exp. Co.,Ltd is a professional manufacturer as well as international trader of raw material release liners, which was located in Hangzhou City, Zhejiang Province, China. We have a complete management system from design, manufacture,quality control, inventory and shipment to the middle and high-end market. Especially, we not only own eximious design ability, but also behave sensitively and proficiently in innovating products development.
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