| 摘要 |
<p>A filter leaf intended to be used alone or with others includes a supporting structure formed by two sheets bonded together, each sheet having parallel corrugations and a U-section rim, the sheets being orientated for bonding so that the corrugations of one sheet are at an angle (preferably a right angle) to the corrugations of the other sheet and so that the U-section rims are joined to form a tubular border; an outlet communicating by a cross channel with the corrugations is formed at the centre of each sheet. Nylon or other filtering fabric is stretched over this supporting structure.</p> |
