| 摘要 |
1,001,277. Valve bags. POLYMER INDUSTRIE CHIMICHE S.p.A. Oct. 8, 1962 [Oct. 13, 1961], No. 38011/62. Heading B8K. [Also in Division B5] A sheet of material V is secured along lines Sb, Sc to the inner wall of a tube; a slit t is made in that part of the tube covering the sheet V and the ends of the tube are subsequently sealed at St. The junction of the seals Sb, Sc is preferably in the form of a semi-circle R and the slit t starts at the centre of this semi-circle. The slit t may coincide with the folded edge of the bag. The seams may be welded if thermoplastics material is used. The bag may also be made of fabric, laminate or paper. |
