Method for measuring peeling stability of release film and release film laminate
Provided is a method for measuring the peeling stability of a release film and a release film laminate by measuring a high-speed release strength balance and a low-speed strength balance on the basis of General Formulas 1 and 2.
1. A method for measuring the peeling stability of a release film, the method including the steps of:
preparing a laminate including an adhesive layer and a light-peel release film and a medium-peel release film attached to both sides of the adhesive layer;
obtaining a light-peel, low-speed release strength by measuring the release strength of the light-peel release film and the adhesive layer at the peeling speed of 0.3 to 3.0 m/min;
obtaining a medium-peel, low-speed release strength by measuring the release strength of the medium-peel release film and the adhesive layer at the peeling speed of 0.3 to 3.0 m/min;
obtaining a light-peel, high-speed release strength by measuring the release strength of the light-peel release film and the adhesive layer at the peeling speed of 10 to 30 m/min;
obtaining a medium-peel, high-speed release strength by measuring the release strength of the medium-peel release film and the adhesive layer at the peeling speed of 10 to 30 m/min; and
measuring a high-speed release strength balance and a low-speed release strength balance on the basis of the following General Formulas 1 and 2
High
-
speed
release
strength
balance
=
medium
-
peel
,
high
-
speed
release
strength
light
-
peel
,
high
-
speed
release
strength
[
General
Formula
1
]
Low
-
speed
release
strength
balance
=
medium
-
peel
,
high
-
speed
release
strength
light
-
peel
,
high
-
speed
release
strength
.
[
General
Formula
2
]
2. The method of claim 1 , further comprising the steps of:
measuring a light-peel speed change rate on the basis of the following General Formula 3 by using the light-peel, high-speed release strength and the light-peel, low-speed release strength; and
measuring a medium-peel speed change rate on the basis of the following General Formula 4 by using the medium-peel, high-speed release strength and the medium-peel, low-speed release strength;
Light
-
peel
speed
change
rate
(
%
)
=
(
light
-
peel
,
high
-
speed
release
strength
-
light
-
peel
,
low
-
speed
release
strength
)
light
-
peel
,
low
-
speed
release
strength
×
100
[
General
Formula
3
]
Medium
-
peel
speed
change
rate
(
%
)
=
(
medium
-
peel
,
high
-
speed
release
strength
-
medium
-
peel
,
low
-
speed
release
strength
)
medium
-
peel
,
low
-
speed
release
strength
×
100
.
[
General
Formula
4
]
3. The method of claim 1 , wherein the preparing of the laminate comprises the step of storing the laminate at 20° C. to 100° C. for 0.5 hour to 720 hours.
4. The method of claim 1 , wherein the light-peel release film and the medium-peel release film each comprise a laminated structure of a release layer and a base layer.
5. The method of claim 4 , wherein the release layer comprises at least one selected from the group consisting of a silicone-based release agent, a melamine-based release agent, a polyolefin-based release agent, an epoxy-based release agent, an acrylic release agent, a fluorine-based release agent, a cellulose-based release agent, a paraffin-based release agent, an epoxy-melamine-based release agent, and a combination thereof.
6. The method of claim 4 , wherein the base layer comprises at least one selected from the group consisting of polyethylene terephthalate (PET), polyethylene (PE), polyvinyl alcohol (PVA), and a combination thereof.
7. The method of claim 1 , wherein the adhesive layer comprises at least one selected from the group consisting of an acrylic adhesive, a silicone-based adhesive, a rubber-based adhesive, and a combination thereof.