Mechanical locking of floor panels with vertical folding

1. An installation method to connect floor panels with vertical folding whereby the panels have an angling locking system on long edges and a vertical folding system on short edges for locking the panels vertically and horizontally, whereby a first and a second panel are lying flat on a sub floor with a first long of the first panel is connected to a second long edge of second panel, wherein the method comprises the steps of:

a) bringing a second long edge of a new panel in contact with an upper part of the first long edge of the first panel so that the new panel in one plane is angled at an angle greater than zero relative to the first panel in another plane;

b) bringing a short edge of the angled new panel in contact with a short edge of the second panel, whereby the angled new panel is maintained at an angle greater than zero relative to the first panel by friction resulting from at least one contact point between the angled new panel and the first panel in the angling locking system on the long edges;

c) bringing the panels to a position where the long edges have vertical upper and lower contact points and horizontal inner and outer contact points between adjacent surfaces of the first and second long edges while pressing an upper edge of the first panel against an upper edge of the new panel at a contact angle;

d) pressing a short edge section of the new panel downward towards the sub floor; and

e) connecting the first, second and new panel to each other with vertical folding, wherein the vertical folding system on the short edges comprises an edge with a strip and a locking element which are flexible and comprise wood fibre-based material.

2. The installation method as claimed in claim 1 , wherein the long edges have vertical upper and lower contact points and horizontal inner and outer contact points between adjacent surfaces of the first and second long edges when the new panel is pressed with its upper edge against the upper edge of the first panel at an angle against the principal plane between about 0 to about 10 degrees.

3. The installation method as claimed in claim 1 , wherein the cores of the panels comprise high density fibreboard (HDF).

4. The installation method as claimed in claim 1 , wherein the panels have a thickness of about 6-9 mm.

5. The installation method as claimed in claim 1 , wherein the panels have a length not exceeding about 120 cm.

6. The installation method as claimed in claim 1 , wherein wax is provided in the angling locking system.

7. The installation method as claimed in claim 1 , wherein the vertical folding system on the short edges further comprises a flexible tongue spaced horizontally at a distance greater than zero from the locking element and formed in one piece with a core of one of the panels, wherein the locking element is disposed more distally on the edge than the flexible tongue, and the flexible tongue extends downwards and comprises an undercut groove formed behind the flexible tongue.

8. The installation method as claimed in claim 7 , wherein the strip and/or the locking element is configured to flex during the vertical folding.

9. The installation method as claimed in claim 8 , wherein the strip comprises a cavity adjacent to the locking element configured to increase the flexibility.

10. The installation method as claimed in claim 1 , wherein the angling locking system on the long edges comprises a locking strip with an upwardly directed locking element at an edge and a downwardly open locking groove at an adjacent edge for locking the edge and the adjacent edge horizontally, and

wherein the angling locking system on the long edges comprises a tongue extending horizontally perpendicular to an edge and a horizontally open tongue groove in an adjacent edge for connecting the edge and the adjacent edge in a vertical direction.