US2906446A - Bag - Google Patents

Description

` Sept. 29, 1959 R. J. wlLLlAMs I '-2,906446 BAG Filed Aug. 18, 1858 United States Patent O F Bag Company, St. Louis, Mo., a corporation of Mis- Soul'l 'AppliaonAugust 18, 1958, serial No. 755,715

i sclaim. 7(c1. 229-625) This vinventio'n relates. tolbags, and more particularly to pasted valve 'bags' such as' are used for finely divided or pulverized materials (fertilizer, for example) ,and which are filled bytrneans of a filling spout'received in the valve.

Among the several objects of the inventionfmay be:

noted the provision of a pasted valve bag of theclass de;

scribed having an improved valve construction including a novel sleevewhich permitsfree flow of material from the filling spout into the bag so as to avoid clogging, and which provides for 4tight closure of the bag upon removal from the filling spout after the bag has been filled; the provision of a valve .construction such as describedin which thelsleev'e includes a special check valve member which is adapted to permit the stated freeflow of material into the bag during the filling of the bag and which closes when the bag has been filled; and the provision of a bag with a valve construction having the stated characteristics which is economical to manufacture. Other objectsand features will be in part apparent and in part pointed out hereinafter.

The invention accordingly comprises the constructions hereinafter described, the scope 'of the invention being indicated in the following 'claimsi n In the accompanying drawings, in which one of various possible embodiments of the invention is illustrated,

Fig. 1 is a perspective view of a pasted valve 'bag in which the invention is incorporated, the bag appearing as if filled;

Fig. 2 is a plan viewof the valve corner portion of the bag, parts being shown in a condition -assfumed during the formation of the closure;

Fig. 3 is a perspective view of the valve; corner portion of the bag with certain side flaps opened up better to show the construction; and

Fig. 4 is a perspective view of the valve sleeve per se as it appears when viewed from its bottom.

Corresponding reference characters indicate corresponding parts throughout the several views of the drawmgs.

Referring to the drawings, there is indicated at 1 in Figs. 1-3 a pasted multiwall paper bag provided with va valve of this invention. As will be understood by those skilled in the art, such bags are usually made by segmenting a continuous length of multiwall bag tubing into individual bag tubes, and providng each such tube with a pasted closure at each end, for example a diamond fold type of closure. Fig. 1 illustrates the closure 3 at the valve end of the bag. As appears in Figs. 1-3, the closure comprises side fiaps 5 and 7 and inwardly directed end fiaps 9 and 11. End flap 9 is the end flap at the valve corner of the bag. In forming the closure 3, the side flap 5 is folded over upon a transverse fold line 13 to overlie the end fiaps, and the side flap 7 is folded over upon a transverse fold line 15 to overlap the side flap 5. A pattern of paste such as ndicated at P is applied to accomplish pasting of side flap 5 to end flap 11 (the end flap opposite the valve corner) and pasting of side completedsleeve) into the form of a flattened tube. One

2,906,448 Patented Sept. 29, 1959 ice . flap 7 to sideflap 5. Each side flap, as folded over, includes portions of the endrfiaps, such as portions 9a and 9b of end flap 9. a

'In accordance with this invention, a special valve sleeve S of this inventon is applied to end flap 9 prior to theV folding over of the side fiaps and becomes incorporated in the closure 3, projecting inward from end flap 9 into the bag, Sleeve S is constituted by a rectangular pieceof flexible material, such as `ltraft paper, folded on foldV lines 17 and 19 (which extend lengthwise of the w i wall of the flat tubular sleeve S is constituted by the portion of the piece of material lying between fold lines 17 and 19 and is designated 21. The other wall of the flattubular sleeve S is constituted by the portion 23 of the piece of material lying between fold line 17 and edge ,25

of'the piece' of material, and by -the portion 27 of the piece 'of material lying between lfold'line 19 and the edge 22 ,of the piece of material. Portion 23 is wider than portion 27 andoverlaps the latter on the outside thereof.

e The width of portion 27 is preferably half the total width of thesleeve so that the edge 29 is located centrally inL respect to the width of the sleeve. The lapping side marginsiof the piece of material are specially designated 23a and 27a, 23a being a part of portionV 23 and 27a being. a part of portion 27, 23a being on the outside of 27a.

Margin 23a is provided with a slit 31 extending transversely from itsedge 25. The length of the slit, as shown, corresponds generally to the width of the lapping margins , I 23a and 27a, Margins 23a and 27a are shown as being securedv together by paste at 33 from the slit 31 to one o. the other end 37 (the inner end) of the sleeve, margin 23ajis`free of margin 27a, and this fre portjion of the margii'1`23'a constitut'es alcheck .valve flap 'design'ated F.

v'The sleeve S, made |as abovefdescrbed, 'is'fapplied to the outside of end flap 9 with the wll of the vsleeve constituted by portions 23 and 27 facing toward the end -flap 9, with 'slit 31 located slightly inward from the inner-end edge 39 of the end flap 9, with the end 35 of the sleeve positioned on the flap 9 outward of the end edges of side flaps 5 and 7 and the portion of the sleeve from slit 31 to the end 37 of the sleeve projecting inward from the inner end edge 39 of end flap 9. The width of th'e sleeve corresponds to the width of the pasted closure as determined by the distance between the fold lines 13 and 15 of the closure. The sleeve is pasted to end flap 9 by paste P, and the pattern of paste P is such that side flap 5 (including portion 9a of flap 9) becomes pasted to wall 21 of the sleeve.

The sleeve S is adapted to receive a filling spout for filling the bag, spreading open upon insertion of a spout therein. The material delivered through the spout flows freely into the bag through the sleeve in 'the direction of the length of the sleeve and also in a lateral direction with respect to the length of the sleeve (downward into the bag), the flap F opening up away from margin 27a to provide an opening between edge 29`and the flap F for such lateral flow. When the bag has been filled and is taken off the spout, the sleeve flattens out and flap F is pressed against margin 27a by the bag contents to close ofi the opening and prevent escape of material.

It is preferable that the lapping margins 23a and 27a,

be pasted together at 33 in the region lying outward, from the slit 31 in order to prevent the inner margin 27a from curling up away from the margin 23a and hanging up on the spout, but it is not essential that these margins be so pasted together, and the paste at 33 may in some instances be omitted.

As various changes could be made in the above con-V structions without departing from the'sco'pe of the inven-f tion, it is intended that all matter contained in the above description or shown in the'accompanying drawings shall be interpreted as illus'trative and not'tin alimiting sense.

I clam: I 1. A bag having a closure atone end and provided With a valve at one corner at said end,`"said closure having an' inwardly directed end flap at said Yalvecorner and said valve comprising a flexible sleeve secured to and proecting inward from said end flap,rsaidl sleeve beingc'onstituted by a piece of flexible material folded into the'rform of a flattened tube in which one side margin of the piece of material ove'rlaps the other side margin and lies on the outside of said other margin, said sleeve being'adapted to receive a filling spout for filling -the bag, and spreading open upon insertion of a spout therein, said lapping mar'- gins being located in one wall of said sleeve and said wall being secured to the outside of said end flap,`sad one marginhavingl a slit extending transversely from the edge thereof, said slit being located between the innerl end edge of said end flap and the inner end of sleeve, the portion'of said one margin which extends from said slit into the bag constituting a' check valve flap adapted to open up away from the otherV margin upon inserting a filling spout in the sleeve and upon delivery of material through the spout into the bag for permitting flow of material between the said margins, said check valve flap being adapted to close back over said other margin upon 5. A paper bag having a pasted closure at one end and provided with a valve at one corner at said' end, said closure having an inwardly drected end flap at said valve corner, a first side flap overlying said end flap, and a second side flap overlying and pasted to said first side flap, said valve comprising a flexible sleeve pasted to and projecting inward from said end flap, said sleeve being constltuted by a piece of flexible. material folded into the form of a flattened tube in which one side margin of the piece of material'overlaps the other side margin and lies on the outside of said other side margin, said sleeve being adapted to receive a filling spout for filling the bag, and spreading open upon insertion of a spout therein, said lapping margins being located inl one wall of said sleeve, the outer end portion of the sleeve'lying between said end flap and said first side flap with said one wall of the sleeve pasted to the end fiap and the other wall of the sleeve pasted to said first side flap, said one margin having a slit extending transversely from theedge thereof, said slit being located between the inner end edge of said end flap and the inner end of the sleeve, the portion of said one margin which extends from said slit into the bag constituting a check valve flap adapted to open upaway from the other margin upon inserting a filling spout in the flattening out of the sleeveafter withdrawal of the spoutV when the bag has been filled.

2. A bag as set forth in clam 1 n which the edge of said other margin is located centrally in respect to the width of the sleeve.

3. A bag as set forth in clairn 1 in which the margins are secured together outward of the slit.

4. A bag as set forth in clam 1 in which the edge of said other margin is located centrally in respect to the width of the sleeve and in which the margins are pasted together outward of the slit.

sleeve and upon delivery of material through the spout into the bag for permitting lateral flow of material between the said margins, said check valve flap being adapted to close back over said other margin upon fiattening out of the sleeve after withdrawal of the spout when the bag has been filled.

` 6. A paper bag as set forth in clam 5 in which the edge of said other margin is located centrally in respect to the width of the sleeve.

7. A paper bag as set forth in clam S'in which the margns are secured together outward of the slit.

8. A paper bag as set forth in clairn 5 in which the edge of said other margin is located centrally in respect to the width of the sleeve and in `which the margins are pasted together outward of the slit.

No references cited.

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