Foldable backplate film manufacturing method
The present application relates to a method for manufacturing a foldable backplate film, and according to one aspect of the present invention, a method for manufacturing a foldable backplate film that the foldable backplate film is manufactured by a method of cutting it in a direction from the release film to the protective film upon half-cutting, and then release-changing the release film, whereby by improving a half-cutting process, the foldable backplate does not fall off upon the release film peeling, is provided.
1. A method for manufacturing a foldable backplate film comprising steps of:
preparing a foldable backplate comprising a base film and a pressure-sensitive adhesive layer provided on one side of the base film;
attaching a first release film to the opposite side of the side of the first pressure-sensitive adhesive layer that is in contact with the base film;
attaching a protective film to the opposite side of the side of the base film that is in contact with the pressure-sensitive adhesive layer;
half-cutting the foldable backplate in a direction from the first release film to the protective film along a cutting line dividing a body part and a pad part;
peeling the first release film from the pressure-sensitive adhesive layer after the half-cutting step; and
attaching a non-cut second release film to the position where the first release film has been peeled off to manufacture the foldable backplate film.
2. The method for manufacturing a foldable backplate film according to claim 1 , wherein in the half-cut foldable backplate,
each of the first release film, the base film and the pressure-sensitive adhesive layer comprises a penetration regions penetrated along the cutting line, and
the protective film has a groove formed along the cutting line.
3. The method for manufacturing a foldable backplate film according to claim 1 , wherein the foldable backplate film has a structure in which the second release film, the pressure-sensitive adhesive layer, the base film and the protective film are sequentially laminated,
each of the pressure-sensitive adhesive layer and the base film comprises a penetration region along the cutting line,
the protective film comprises a groove along the cutting line, and
the second release film does not comprise a penetration region or a groove formed.
4. The method for manufacturing a foldable backplate film according to claim 1 , wherein the base film has an elongation at break of 20% or more and 200% or less at 20° C.
5. The method for manufacturing a foldable backplate film according to claim 1 , wherein the base film has a thermal contraction rate of 0.1% or less at 200° C.
6. The method for manufacturing a foldable backplate film according to claim 1 , wherein the base film is a polyimide base film.
7. The method for manufacturing a foldable backplate film according to claim 1 , wherein the base film has a thickness of 20 μm or more and 120 μm or less.
8. The method for manufacturing a foldable backplate film according to claim 1 , wherein the peel force of the first release film from the pressure-sensitive adhesive layer is 12 gf/inch or less at 23 ° C.
9. The method for manufacturing a foldable backplate film according to claim 1 , wherein the first release film and the second release film are silicone series.
10. The method for manufacturing a foldable backplate film according to claim 1 , wherein the first release film and the second release film have a surface resistance of 10 10 Ω/sq or less under a condition of 500 V or less.
11. The method for manufacturing a foldable backplate film according to claim 1 , wherein the protective film has a groove formed along the cutting line.
12. The method for manufacturing a foldable backplate film according to claim 3 , wherein the penetration region of the base film is a first penetration region that is in communication with groove in the protective film and wherein the penetration region of the pressure-sensitive adhesive layer is a second penetration region that is in communication with the first penetration region.
13. The method for manufacturing a foldable backplate film according to claim 1 , wherein the base film has a storage elastic modulus of 1 GPa to 5 GPa at 20° C.