What is a Release Liner ?
Release liner is a type of paper that is used to protect the sticky surfaces of adhesive sheets and tapes. The surface of the paper is treated to release it.
It is used to protect the sticky side of various double-sided tapes and stickers, and to protect the pharmaceutical side of adhesive bandage and adhesive medicines.
Our “
” release liner product line group (line -up) is the best on the market. It meets a wide range of specifications with high performance and high quality, meeting the needs of many adhesive and bonding products.
We are committed to providing useful products to our customers.
※ Release liner is also called release liner.
Release liner consists of a laminate comprising a release agent layer, a barrier layer and a substrate layer.
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Release agent (silicone,etc.)
Silicone release agents are the best option. Non-silicone release agents are also used in some applications.
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Barrier agent(PE)
Polyethylene (PE) is often used to prevent the release agent from penetrating the paper
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Substrate(base paper)
Fine paper, kraft paper, glassine paper, etc.
Since the release agent is a liquid, if it is applied directly to paper, the release agent will soak into the paper and will not provide sufficient release performance.
Therefore, a polyethylene barrier layer is added between the pulp fibers of the paper to prevent the release agent from soaking into the paper.
Silicone resin is mainly used as the release agent, but non-silicone release agents are used for some electronic applications where silicon (Si) is not desired.
Our Release Liner is used in
various occasions of daily lives.
- Automobile
- Smart Phone
- Sticking plaster / Adhesive medicine
- Wallpaper
- Marking film
- Building materials
- Stationery / general goods
- Flexible printed circuit(FPC)
- etc.
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SL type
Single-sided Release Liner
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SLK type
Single-sided Release Liner with PE Laminated Back
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SLB type
Double-sided Release Liner
Single-sided Release Liner
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Structure
Silicone / Polyethylene / Base paper
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Base paper color
White, cream, blue, brown, light brown
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Basis weight of base paper
50g/㎡～120g/㎡
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Release liner thickness
75μm～285μm
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Basis weight of release liner
65g/㎡～160g/㎡
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Main applications
Kraft paper-backed adhesive tape
Process paper
Labels
Sticker backing paper -
Feature
- Light release
- Very low migration
- Exposure resistance
- Product Exampless
- Single-sided Release Liner SL-70SU2
- Structure
- Silicone / PE / Semi-bleached kraft paper(70g/㎡)
Typical Characteristics
| Item | Measured value | Test procedure (Test Method) |
|---|---|---|
| Total Thickness （μm） |
110 | JIS P-8118 |
| Basis weight of base paper （g/㎡） |
90 | JIS P-8124 |
| Tensile strength （kN/m） |
MD 4.5 CD 2.5 |
JIS P-8113 |
| Tear strength （mN） |
MD 650 CD 750 |
JIS P-8116 |
| Release strength （N/m） |
8 | ※１ |
| Residual adhesion ratio （％） |
90 | ※２ |
※1
Adhesive: Oribain BPS-8170
Laminating paper: Wood-free paper 78g/m2
Release speed: 5m/min
Release angle: 180°(tape release)
※2
Standard tape: Nitto 31B
Standard board: stainless platel (#280)
Release speed: 0.3 m/min
Release angle: 180°
These values are representative values, not standard values.
Also, peel load and residual adhesion ratio vary greatly depending on the measurement conditions, so please check the quality under your company’s conditions before use.
Single-sided Release Liner with PE Laminated Back
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Structure
Silicone / Polyethylene / Base paper / Polyethylene
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Base paper color
White, cream, blue, brown, light brown
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Basis weight of base paper
50g/㎡～120g/㎡
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Release liner thickness
90μm～220μm
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Basis weight of release liner
75g/㎡～180g/㎡
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Main applications
Marking Sheet、Labels、wallpaper
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Feature
- Good curl-ability
- Light to medium release
- Non-migration
- Exposure resistance
- Product Examples
- Single-sided Release Liner with PE Laminated Back SLK-70AW
- Structure
- Silicone / PE / Wood-free paper (70g/m2) / PE
Typical Characteristics
| Item | Measured value | Test procedure (Test Method) |
|---|---|---|
| Total Thickness （μm） |
110 | JIS P-8118 |
| Basis weight of base paper （g/㎡） |
105 | JIS P-8124 |
| Tensile strength （kN/m） |
MD 6.5 CD 4.5 |
JIS P-8113 |
| Tear strength （mN） |
MD 500 CD 500 |
JIS P-8116 |
| Release strength （N/m） |
15 | ※１ |
| Residual adhesion ratio （％） |
98 | ※２ |
※1
Adhesive: Oribain BPS-8170
Laminating paper: Wood-free paper 78g/m2
Release speed: 5m/min
Release angle: 180°(tape release)
※2
Standard tape: Nitto 31B
Standard board: stainless platel (#280)
Release speed: 0.3 m/min
Release angle: 180°
These values are representative values, not standard values.
Also, peel load and residual adhesion ratio vary greatly depending on the measurement conditions, so please check the quality under your company’s conditions before use.
Good curlability of SLK type
One-sided release liner (SL-type) is made of paper on one side. Paper tends to curl easily because of its tendency to stretch when it absorbs moisture in the air (humidity).
In order to improve this tendency to curl, one-sided release liner with laminated back (SLK-Type) is laminated with polyethylene as a moisture-proof layer.
Single-sided release liner with laminated back is used for wallpaper and marking sheet applications where good curlability is especially required.
Double-sided Release Liner
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Structure
Silicone / Polyethylene / Base paper / Polyethylene / Silicone
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Base paper color
White, cream, blue, brown, light brown
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Basis weight of base paper
50g/㎡～120g/㎡
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Release liner thickness
90μm～220μm
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Basis weight of release liner
75g/㎡～180g/㎡
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Main applications
Various double-sided tapes
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Feature
- Stability in differential release strength from low to high peel speed
- Less time-dependent change of release strength
- Non-migration
- Product Examples
- Double-sided release liner SLB-80WD(#1300)
- Structure
- Silicone / PE / Wood-free paper (78g/m2) / PE / Silicone
Typical Characteristics
| Item | Measured value | Test procedure (Test Method) |
|---|---|---|
| Total thickness （μm） |
125 | JIS P-8118 |
| Basis weight of release liner （g/㎡） |
115 | JIS P-8124 |
| Tensile strength （kN/m） |
MD 9.0 CD 6.0 |
JIS P-8113 |
| Tear strength （mN） |
MD 550 CD 550 |
JIS P-8116 |
| Release force(strenght) （N/m） |
inside 52 outside 25 |
※１ |
| Residual adhesion ratio （％） |
inside 98 outside 98 |
※２ |
※1
Adhesive: Oribain BPS-8170
Laminating paper: Wood-free paper 78g/m2
Peeling speed: 5m/min
Peeling angle: 180°(tape release)
※2
Standard tape: Nitto 31B
Standard board (Substrate): stainless platel (plate) (#280)
Peeling speed: 0.3 m/min
Peeling angle: 180°
These values are representative values, not standard values. Peel load and residual adhesion rate vary greatly depending on the measurement conditions, so please check the quality under your own conditions before use.
SLB type dissimilarity peeling
In the case of silicone release liner, it is important to note that the higher the release speed, the higher the release load tends to be. However, since the speed dependence differs depending on the combination of the release agent and adhesive, the heavy release surface and the light peeling surface may be reversed at different release speeds, which may cause a “tear-off” defect (in the case of release agents A and B in the left figure).
Therefore, when we design and develop a double-coated release agent, we select an appropriate release agent according to the adhesive used by the customer, and design it so that there is always a peeling difference (i.e., differential peeling) without reversal of peeling load within the expected peeling speed range (see the figure on the right).
About our release liner
We offer a wide variety of release agents and base materials (base paper) for our release liner, and we can also offer a variety of products by combining them with PE surface smoothness (matte/semi-matte/mirror).
| SL type Single-sided Release Liner |
SLK type Single-sided Release Liner with PE Laminated Back |
SLB type Double-sided Release Liner |
|
|---|---|---|---|
| Structure |
Release agent (silicone,etc.) Barrler agent(PE) Substrate(base paper) |
Release agent (silicone,etc.) Barrler agent(PE) Substrate(base paper) Moisture-proof layer (PE) |
Release agent (silicone,etc.) Barrler agent(PE) Substrate(base paper) Barrler agent(PE) Release agent (silicone,etc.) |
| Feature |
Light release Very low migration Exposure resistance |
Good curl-ability Light to medium release Non-migration Exposure resistance |
Stability in differential release strength from low to high peel speed Less time-dependent change of release strength Non-migration |
| Examples of Uses |
Kraft paper-backed adhesive tape Process paper Labels Sticker backing paper |
Marking sheet Wallpaper |
Various double-sided tapes |
Strip Paper Manufacturing
Sumilease development to supply
We can meet a variety of quality requirements from light release to heavy release and base paper types.
We can also supply in small lots and with short delivery times.
Please contact us for the order unit.
Base paper used as base material can be selected from kraft paper, clupak paper, crepe paper, glassine paper, etc., depending on the intended use (other base materials are also available upon request).
We also offer base paper in a variety of colors, including white, blue, cream, brown, and light brown.
