Roll-up door with low friction edges

A roll-up door comprising:

• a flexible sheet forming a curtain for closing a doorway having an upper end, a lower end, and two opposite side edges, said sheet having a relatively thin main area and elongate side edge sections that are thicker than the remainder of said sheet, a sloping shoulder being formed where each said edge section meets said main area;
• a curtain winding mechanism having said upper end attached thereto for raising said curtain;
• a pair of spaced apart guide channels in which said side edge sections are respectively movable, said side edge sections being engageable respectively with said guide channels;
• and
• friction reducing, wear resistant fabric strips attached to both of said side edge sections, extending therealong in a direction parallel to said side edges, and attached to both sides of each side edge section of the curtain, said fabric strips including fabric strips covering and attached to the sloping shoulders and reducing the amount of friction between said side edge sections and their respective guide channels, wherein the fabric strips covering the sloping shoulders form a long, substantially continuous, friction reducing surface extending lengthwise along each sloping shoulder.

A roll-up door comprising:

• a vertically movable flexible curtain for closing a doorway, said curtain having an upper end, a lower end, and side edges, said curtain having a relatively thin main area and a thicker strip along a substantial length of each side edge with each strip forming a windlock, a sloping shoulder being formed where each strip meets said main area;
• a curtain winding mechanism having said upper end attached thereto for raising and lowering said curtain;
• a curtain guide system including a pair of spaced apart guide channels in which said side edges including the thicker strips are respectively movable, each thicker strip being engageable with its respective guide channel;
• and
• friction reducing, wear resistant polyester fabric strips bonded to both of the thicker strips and extending therealong in a direction parallel to said side edges, said fabric strips including fabric strips covering and bonded to the sloping shoulders and reducing the amount of friction between said thicker strips and their respective guide channels when the curtain is raised or lowered.