| 摘要 |
PURPOSE: To allow the easy swelling, etc., of a material to be extracted, be sufficiently contractable with an extracted liquid and be easily mountable to the bore part of an existing receiving container by joining a synthetic resin sheet supporting body of a specific thickness at the circumference in the aperture of a flat bag-shaped filter part consisting of synthetic fibers along its end edge in the position nearer the bottom side of the bag than the end edge. CONSTITUTION: This bag filter 1 is produced by superposing two sheets of non-woven fabrics of synthetic fibers and joining the circumference thereof exclusive of the marginal side of the aperture, thereby forming the flat bag-shaped part 2. The synthetic resin sheet supporting body 3 having a thickness of 0.05 to 0.5mm is pressed to the outer side face of the non-woven fabrics of the synthetic fibers of the flat bag-shaped part 2 and engaged integrally with the joint 5 at the peripheral edge of the bag body to the outer side face of the non-woven fabrics by a heat sealing method, etc., at the peripheral edge of the bag body part. The synthetic resin sheet supporting body 3 is joined at a joint line 4 only to the non-woven fabrics of the synthetic resins nearer the bottom side than the opening edge of the flat bag- shaped part. The sheet-like supporting body 3 is turned inside out to form a cup-shaped container filter of a shape connected with the opening by the joint 5 in the joint part at the end edge at the time of use. The collar of the filter is supported at the opening edge of the receiving container. |
