Method for manufacturing foldable backplate film
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 to an extended release film, whereby by improving a half-cutting process, the release film is not peeled off due to the sticking-out of the pressure-sensitive adhesive upon product handling and transportation, or 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 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,
wherein at least one width of the second release film is greater than the width of the foldable backplate.
2. The method for manufacturing a foldable backplate film according to claim 1 , wherein a difference between the at least one width of the second release film and the width of the foldable backplate is in a range of 0.1 mm to 20 mm.
3. The method for manufacturing a foldable backplate film according to claim 1 , wherein an edge of the non-cut second release film is extended to the outside of the foldable backplate, and the extended length is in a range of 0.1 mm to 10 mm.
4. 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 region penetrated along the cutting line, and
the protective film has a groove formed along the cutting line.
5. 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 comprise 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 along the cutting line.
6. 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.
7. 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.
8. The method for manufacturing a foldable backplate film according to claim 1 , wherein the base film is a polyimide base film.
9. 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.
10. 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.
11. 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.
12. 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 1010 Ω/sq or less under a condition of 500V or less.
13. The method for manufacturing a foldable backplate film according to claim 1 , wherein the protective film has a groove formed along the cutting line.
14. The method for manufacturing a foldable backplate film according to claim 5 , wherein the penetration region of the base film is a first penetration region that is in communication with groove in the protective film and the penetration region of the pressure-sensitive adhesive layer is a second penetration region that is in communication with the first penetration region.
15. 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.