Laminating film and light-transmitting laminate including same
A film for laminating includes an embossed surface, wherein a rad value of the embossed surface is 1 to 3 μm, where the rad value is calculated by [Formula 1] below: rad ( um ) = 1 0 0 0 Spc ( mm - 1 ) [ Formula 1 ] where, in [Formula 1], Spc is an arithmetic mean of curvatures of peak vertex on the embossed surface, which is evaluated by ISO_25178, wherein a number of peaks per 1 mm 2 of the embossed surface (Spd value), which is evaluated by ISO_25178, is 200 or more and 1500 or less, and wherein a sum of maximum peak height and maximum valley depth of the embossed surface (Sz value) is 30 to 90 μm.
1. A film for laminating comprising an embossed surface,
wherein a rad value of the embossed surface is 1 to 3 μm, where the rad value is calculated by [Formula 1] below:
rad
(
um
)
=
1
0
0
0
Spc
(
mm
-
1
)
[
Formula
1
]
where, in [Formula 1], Spc is an arithmetic mean of curvatures of peak vertex on the embossed surface, which is evaluated by ISO_25178,
wherein a number of peaks per 1 mm 2 of the embossed surface (Spd value), which is evaluated by ISO_25178, is 200 or more and 1500 or less, and
wherein a sum of maximum peak height and maximum valley depth of the embossed surface (Sz value) is 30 to 90 μm.
2. The film for laminating of claim 1 , wherein the rad value of the embossed surface is 1.5 to 3 μm.
3. The film for laminating of claim 1 , wherein the film for laminating has a variance of vacuum degree of 0 to 40 mmHg, when after light transmitting bodies are laminated on both surfaces thereof, vacuumizing is performed at room temperature, and a temperature of the film for laminating is raised by 10° C.
4. The film for laminating of claim 1 , wherein the film for laminating is a single layer film or a laminated film of two layers or more.
5. The film for laminating of claim 1 , wherein the film for laminating comprises a polyvinyl acetal resin.
6. The film for laminating of claim 1 , wherein the film for laminating comprises a wedge shape in at least some or all of a cross-section thereof.
7. A light transmitting laminate comprising:
a first light transmitting layer;
a film for laminating disposed on one surface of the first light transmitting layer; and
a second light transmitting layer disposed on the film for laminating,
wherein the film for laminating comprises an embossed surface, wherein a rad value of the embossed surface is 1 to 3 μm, where the rad value is calculated by [Formula 1] below:
rad
(
um
)
=
1
0
0
0
Spc
(
mm
-
1
)
[
Formula
1
]
where, in [Formula 1], Spc is an arithmetic mean of curvatures of peak vertex on the embossed surface, which is evaluated by ISO_25178,
wherein a number of peaks per 1 mm 2 of the embossed surface (Spd value), which is evaluated by ISO_25178, is 200 or more and 1500 or less, and
wherein a sum of maximum peak height and maximum valley depth of the embossed surface (Sz value) is 30 to 90 μm.
8. The light transmitting laminate of claim 7 , wherein the rad value of the embossed surface is 1.5 to 3 μm.
9. The light transmitting laminate of claim 7 , wherein a sum of maximum peak height and maximum valley depth of the embossed surface (Sz value) is 30 to 90 μm.
10. The light transmitting laminate of claim 7 , wherein the film for laminating is a single layer film or a laminated film of two layers or more.
11. The light transmitting laminate of claim 7 , wherein the film for laminating comprises a polyvinyl acetal resin.
12. The light transmitting laminate of claim 7 , wherein the film for laminating comprises a wedge shape in at least some or all of a cross-section thereof.
13. A vehicle comprising the light transmitting laminate of claim 7 as a wind shield.