Square ended valve bag
AssigneeBasic Packaging Systems, Inc.
InventorOliver R. Titchenal
Life of this patent
Estimating the term…
Abstract
Square ended valve bags are formed from a tube-like band and in a chain with the back wall and top end of each bag partially sealed together to provide bags between the seals. Patches are placed on the top end of the bag and the patches and top ends are provided with displaced openings to provide a valve. Each bag in turn may be filled through the valve located in the top end, the bag expanding forwardly from the back wall by expanding gussets in the top and bottom ends.
Claims12
In a chain of square ended bags constructed from an elongated band with each of said bags being defined by front and back walls, top and bottom ends, and fore and aft seal sides with each said seal side consisting of portions of said band extending from each said wall and end and sealed together by a side seal, each said seal side being breakably joined to the nearest seal side of the next adjacent bag in the chain, and elongated longitudinal strip means of said band located along the back walls and the top ends of all the bags and at least partially aligning the respective back wall and top end of each bag, the provision of each said bag having its back wall and top end sealed together with a closing seal leg extending from each seal side to the opposite seal side, a patch on said top end affixed around its perimeter to said top end, said patch and said top end having displaced valve openings therein defining a valve means through which the bag may be filled from the top.
The method of making a chain of square ended valve bags each having front and back walls, gusseted top and bottom ends and fore and aft seal sides from an elongated band, said method comprising the steps of:
- (a) providing the band with overlying front and back walls and with longitudinal top and bottom gussets, the front and back sides of the bottom gusset being of substantially equal dimension and the back side of the top gusset being of greater dimension than the front side, and said front side of the top gusset being of a dimension equal to the dimension of either side of the bottom gusset;
- (b) forming continuous side seal legs of equal length at least part way across each of the gussets and across the band between the gussets;
- (c) forming closing seal legs in the back side of the top gusset and longitudinally of the band from the ends of the side seal legs and extending along the length of the back wall of the bag also in a longitudinally elongated portion of the band in the back side of the top gusset;
- (d) cutting an inner valve opening in the gusseted top end between said seal sides;
- (e) affixing a patch to said top end and about the perimeter of the patch, and providing said patch with another valve opening displaced from said inner valve opening;
- and
- (f) repeating steps b, c, d, and e at a longitudinally spaced portion of the elongated band.
Dependencies are inferred from the claim text.