GB307483A - Improvements in valve bags - Google Patents

Abstract

307,483. Bates Valve Bag Corporation, (Assignees of Redington, J. C.). March 9, 1928, [Convention date]. Paper bags.-In a bag comprising a multi-ply paper tube having one corner folded in to form a valve, a single-ply flap is attached to the valve and extends inwards therefrom to close more readily than the turned-in valve corner. A paper flap 13, Fig. 2, is stuck or sewn on to the inner face of the walls of the gusset fold 11 of a bag after the walls have been spread apart and prior to their being tucked inwards to form the valve. To ensure greater flexibility, the sides 14 of the flap are cut away and kept clear of the seam 16, Fig.3, which closes the ends of the bag and secures the usual reinforcing strip 15. In a modification, a sleeve 19, Fig. 5, sewn at one corner 20 and slit as at 21 at the opposite corner, is slipped over the completed valve and secured by the closing seam 16 as before. In another form, a flap 14<a>, Fig. 11, is secured to the outside wall of the gusset fold 10<a> and is then folded back upon itself at 15<a> so that it extends into the bag when the valve is completed. The Specification as open to inspection under Sect. 91 (3) (a) states that the flap may be of cloth. This subject-matter does not appear in the Specification as accepted.