| 摘要 |
1,221,698. Non - woven web; stretching fabrics. VETRERIA ITALIANA BALZARETTI MODIGLIANI, S.p.A. 10 June, 1968 [10 June, 1967], No. 27464/68. Headings D1N, DlR and D1S. [Also in Divisions B8 and F2] A tube of mineral fibres is made by winding a strip N of fibrous felt spirally onto a mandrel 12 and axially removing the tube from the mandrel. The strip is formed by depositing the fibres on a collecting surface and importing to the strip as it so formed a curative in its own plane. As shown, the strip is formed from a gas suspension of fibres passing through hood 22 onto the surface of a rotating perforated cone 20. Since the larger periphery of the cone moves faster than the smaller periphery, a curved strip will be formed. A suction flue 24 assists in collection of the fibres. Bonding agent, fillers and additives can be added to the fibres. The distribution of the fibres across the width of the strip can be varied by baffles or blowers or by using different diameter holes and/or selectively located holes in the cone 20. The strip can be differentially stretched across its width so as to modify its curvature. The strip can be made thickest where it will be subjected to most stretching. |
