Methods for improving straightness in the vertical plane of retractable screen partitions

1. A structure comprising:

a. a frame comprising at least one split tube extendable member that is extendible between a rolled-up configuration and an extended configuration and

b. a screen which can be rolled up with the split tube extendable member,

wherein the split tube extendable member and the screen each comprises a half zip that are engaged with each other to releasably attach the screen to the split tube extendable member, wherein said half zips are stretchable to provide the same tooth spacing for the half zip attached to the split tube extendable member and the half zip attached to the screen.

2. A structure as claimed in claim 1 , wherein the frame comprises a body for holding the split tube extendable member in the rolled-up configuration and a handle for supporting a free end of the split tube extendable member when it is extended.

3. A structure as claimed in claim 2 , wherein in its rolled-up configuration, the split tube extendable member is in a flattened state rolled up in a coil, and in its extended configuration, at least part of the split tube extendable member is in a tubular state; the split tube extendable member being secured in its flattened state to the handle.

4. A structure as claimed in claim 3 , wherein the screen has a cut-out where it is attached to the split tube extendable member in the region of the handle, to accommodate the region of the split tube extendable member when it changes from its flattened state where it is secured to the handle to its tubular state.

5. A structure as claimed in claim 1 , wherein the frame comprises two split tube extendable members, one being attached to the top of the screen and the second being attached to the bottom of the screen.

6. A structure comprising:

a. a frame comprising at least one split tube extendable member that is extendible between a rolled-up configuration and an extended configuration and

b. a screen attached to the frame and having a convex side and a concave side when the split tube extendable member is in its rolled up configuration,

wherein the split tube extendable member and the screen each comprises a half zip that are engaged with each other to attach the screen to the split tube extendible member, wherein teeth of each of the zip halves protrude towards one side of the zip half and wherein the zip halves are attached in such a way that the teeth of the zip halves protrude towards the convex side of the screen.

7. A structure as claimed in claim 6 , wherein the frame comprises a body for holding the split tube extendable member in a rolled-up configuration and a handle for supporting a free end of the split tube extendable member when it is extended.

8. A structure as claimed in claim 7 , wherein in its rolled-up configuration, the split tube extendable member is in a flattened state rolled up in a coil, and in its extended configuration, at least part of the split tube extendable member is in a tubular state; the split tube extendable member being secured in its flattened state to the handle.

9. A structure as claimed in claim 8 , wherein the screen has a cut-out where it is attached to the split tube extendable member in the region of the handle, to accommodate the region of the split tube extendable member when it changes from its flattened state where it is secured to the handle to its tubular state.

10. A structure as claimed in claim 6 , wherein the frame comprises two split tube extendable members, one being attached to the top of the screen and the second being attached to the bottom of the screen by said zips.

11. A structure comprising:

a. a frame comprising an upper split tube extendable member and a lower split tube extendable member that are extendible between a rolled-up configuration and an extended configuration and

b. a screen attached to the upper and lower split tube extendable members and that can be rolled up with the upper and lower split tube extendable members,

wherein at least one rigid rod is attached to the screen that extends vertically along at least part of the distance between the upper and the lower split tube extendable members.

12. A structure as claimed in claim 11 , wherein the at least one rod extends substantially the whole of the distance between the upper and the lower split tube extendable members.

13. A structure as claimed in claim 11 , wherein the at least one rod overlaps with one or both of the upper split tube extendable member and the lower split tube extendable member.

14. A structure as claimed in claim 11 , wherein the at least one rod has a profile that a user can grip to form a bend in the split tube extendable members and the screen.

15. A structure as claimed in claim 14 , wherein the at least one rod has a T-shaped profile.

16. A structure as claimed in claim 11 , wherein the frame comprises a body, for holding the split tube extendable members in a rolled-up configuration and

a handle for supporting a free end of the split tube extendable members when they are extended.

17. A structure as claimed in claim 11 , wherein in their rolled-up configurations, the split tube extendable members are in a flattened state rolled up in a coil, and in their extended configurations; at least part of the split tube extendable members are in a tubular state; the split tube extendable members being secured in their flattened states to the handle.

18. A structure as claimed in claim 17 , wherein the screen has a cut-out where it is attached to the split tube extendable members in the region of the handle, to accommodate the region of the split tube extendable members when they change; from their flattened states where they are secured to the handle to their tubular states.