| 摘要 |
1,003,571. Paper bags. E. KLEIN, W. KLEIN, and H. KLEIN. Aug. 29, 1961 [Aug. 29, 1960], No. 31086/61. Heading B8K. [Also in Division B5D] In a block-bottom paper bag the folded-over triangular portions 2, 3 terminate in tabs 2<SP>1</SP>, 3<SP>1</SP> and the tab 3<SP>1</SP> has sides 9, making angles of approximately 90 degrees with the converging sides 8, 8<SP>1</SP> of the folded-over portion, which are torn during the manufacture of the bag and are thus slightly fluffy and when stuck down prevent leakage from the bag bottom. The cuts 7 on one side of the bag tube stop short of the converging sides 8, 8<SP>1</SP> adjacent the tab 3<SP>1</SP> and these cuts are extended by the tearing to form the short sides 9 of the tab which is stuck down. After having been opened up by the bag-making cylinders 10, 12 the bag bottom is forced against the curved surface 18 of a port 19, fixed to the machine by a pin 13<SP>1</SP>. The margin 6<SP>11</SP> of the gusset A is raised to an upright position by passing between the main web of the part 19 and an attached portion 20 and the bag end is held back by the part 18 so that the cuts 7 in that side of the tube held by the cylinder 10 are extended by the tears. The upstanding margin 6<SP>1</SP> passes through a slot in the gumming roller and is stuck down on to the part 6<SP>1</SP>. |
