Straight edge diagonals

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Pleated blinds are affected by gravity in a different way to other blinds. The weight of fabric causes pleats to be stretched further apart at the top than the bottom. When a diagonal is cut in the fabric the shape is correct whilst on the cutting table, but as soon as the blind is angled to the roof, gravity causes curvature along the diagonal edge. There are two ways to combat this effect.

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The first is to over compensate for the effect. The blind is lifted to the same angle of the conservatory roof and the beginning and end points of the diagonal found. A piece of string covered with chalk dust is then pinged along the diagonal leaving a chalk line. The blind is then brought back to the cutting table and the line followed with a heat knife. The line curves in the opposite direction, when on the table, but when angled is closer to the desired shape.

The second method is most commonly used, called equipleat. This employs a cord with regular loops every 100mm or so. These cords are attached to the float rail, or on some occasions the base rail and every three or four pleats is fed between the support cable pleat holes and the support cable passed through. This locks the equipleat cord in place and maintains a regular distance between pleats regardless of angle. A certain degree of adjustment can be obtained by moving the cord and readjusting it whilst fitting. Trapezium shaped blinds benefit most of all from equipleat.

Roller, pinoleum and roman roof blinds have flat diagonal edges and therefore do not suffer as pleated.

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