Polyvinyl acetal-containing film
The invention relates to a film based on plasticizer-containing polyvinyl acetals having improved uniformity of length variations over the width of the film for manufacturing laminated glazing and its use in laminated glazing or solar modules.
1. A film based on plasticizer-containing polyvinyl acetals having improved uniformity of length variations over the width of the film, said film having a minimum width of 90 cm, and said film having border regions with a width of up to 20 cm, wherein the thickness of said border regions is increased by 0.1 to 4.5% in relation to the mean value of the thickness of the remaining film regions.
2. The film according to claim 1 , wherein said border regions have a thickness increased by 0.9 to 2.8% in relation to the mean value of the thickness of the remaining film regions.
3. The film according to claim 1 , wherein said border regions having an increased thickness are in the lengthwise direction of the film.
4. The film according to claim 1 , wherein the differences in thickness of the film outside said border regions are not greater than +10% relative to the mean value of the thickness outside said border regions.
5. The film according to claim 1 , wherein the film outside said border regions has an average thickness of 0.38, 0.76, 1.14, 1.52, or 2.28 mm.
6. The film according to claim 1 , wherein the film has a minimum width of 200 cm.
7. The film according to claim 1 , wherein the film has a minimum length of 200 cm.
8. A laminated glazing comprising at least two glass panes and at least one film according to claim 1 .
9. A solar module comprising a transparent covering layer, a back side and at least two films according to claim 1 , between which the solar cells are disposed.
10. The solar module according to claim 9 , wherein said covering layer is made of glass or a transparent, weatherproof film and the back side is made of glass, a transparent or non-transparent polymer or a metal.
11. The film according to claim 1 , wherein the width of said border regions is of up to 15 cm.
12. The film according to claim 1 , wherein the width of said border regions is of up to 12 cm.
13. The film according to claim 1 , wherein the width of said border regions is of up to 10 cm.
14. The film according to claim 1 , wherein only two border regions have said increased thickness, and said two border regions are in the longitudinal direction of the film.
15. The film according to claim 1 , wherein only two border regions have said increased thickness, and said two border regions are in the direction of extrusion.
16. The film according to claim 1 , wherein within said border regions the thickness of the film varies in a linear manner from the edge towards the center of the film.
17. The film according to claim 11 , wherein within said border regions the thickness of the film varies in a linear manner from the edge towards the center of the film.
18. The film according to claim 12 , wherein within said border regions the thickness of the film varies in a linear manner from the edge towards the center of the film.
19. The film according to claim 13 , wherein within said border regions the thickness of the film varies in a linear manner from the edge towards the center of the film.
20. The film according to claim 1 , wherein the differences in thickness of the film outside said border regions are not greater than +5% relative to the mean value of the thickness outside said border regions.
21. The film according to claim 1 , wherein the differences in thickness of the film outside said border regions are not greater than +3% relative to the mean value of the thickness outside said border regions.
22. The film according to claim 1 , wherein said border regions have a thickness increased by 0.9 to 1.8% in relation to the mean value of the thickness of the remaining film regions.
23. The film according to claim 1 , wherein said border regions have a thickness increased by 1.8 to 2.8% in relation to the mean value of the thickness of the remaining film regions.