| 摘要 |
[Problem] The aim of the present invention is therefore to provide a filter device for a motor-vehicle air-conditioning system with which increases in resistance to the passage of air are suppressed over prolonged periods, and also the device is easy to handle in the production process as the filtering medium for the filter device can still expand and contract after it has been folded. [Resolving Means] The inventive filter device for a motor-vehicle air-conditioning system is characterized in that a filtering medium 100 has folds comprising a first group of lines, in which zigzag mountain fold lines 1a and valley fold lines 1b are alternately repeated in the Y direction with spaces between them, and a second group of lines 3 in which linear folds running in the Y direction and comprising alternately repeating mountain fold 3a and valley fold 3b sections are arranged parallel to one another; and the second group of lines 3 is intersected at each apex of the zigzag shape of the first group of lines, the mountain fold 3a and valley fold 3b sections of the second group of lines 3 alternate at the point of intersection, and furthermore the mountain folds and valley folds alternate so that adjacent folds of the second group of lines which are split by each fold of the first group of lines are opposing folds.
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