| 摘要 |
A window blind includes an upper beam and a plurality of slats mounted to and below the upper beam. Each slat is formed of extruded plastic and includes a plurality of channels that provide an insulating and noise depression effect. Each slat includes first and second parallel edges and first and second ends extending between the first and second edges. The slats are arranged in a parallel relation and movable between a fully extended state and a fully collapsed state. The channels of each slat extend longitudinally through a whole length of the slat. Each slat includes first and second outer walls forming two opposite flat, parallel surfaces. The first and second edges extend between the first and second outer walls. The channels are located between the first and second outer walls.
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