| 摘要 |
A filter element suitable in particular for a liquid fuel filter is formed by folding a strip of crepe filter paper on itself about a medial longitudinal fold line to bring the two halves of one face of the sheet into apposition and then folding the folded sheet in accordion fashion about a regularly spaced series of transverse fold lines, the opposite face of the sheet having lines of adhesive applied to it adjacent its longitudinal edges so that, on each half of the sheet the free edge of one-half of each pleat is sealed to the free edge of an apposed half of an adjacent pleat, the strip being formed into a zigzag folded pocket, the assembly of pleats thus formed being joined at its opposite ends to form a hollow tubular filter element.
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