US2306538A - Sewed end valve bag - Google Patents

Description

Patented Dec. 29.19.42

UNITED STATES- PA'rl-:N'rjl OFFICE l s'awl-:n szn'snnavs me.. I

Harry StanleyllangemNortlsTal-ryiowmlt..

assigner to St. Regis Omnium New.

York, N. Y., a corporation New York Application March 4, 1938. Serial No. 193.969

' -z claims. (ci. zas-sas) r This invention relates to a valve bas. and more particularly to an improvement whereby the closing of the valve is facilitated.

Details of the invention will appear as the description proceeds.

In the accompanying drawing forming a part of this specification,

Fig, -l is an elevation of an empty 'bag with-parts brokeny away for purposes of illustration;

Fig. 2 is an enlarged sectionon the line 2-2 of Fig. l: i

Fig. 31s a section upon substantially the same line as Fig. 2, but showing only a two-ply bag in.

the position which it occupies after being lled. For convenience, this invention has` been shown in connection with a bag of the type described and patented in the patent to Bates and Cornell,

No. 1,752,292, issued April l, 1930, but it will be readily understood that the improvements which constitute this invention may be applied to any valve in the corner of albag where the valveis A collapsed laterally and expanded longitudinally of the bag when the bag is empty and is spread laterally and collapsed longitudinally ofthe bag when the bag is nlled. The invention relates to an improvement which facilitates the change in the -shape of the valve when the bag is lilled.

In the drawing referred to there is shown a bag I0 closed at the upper end by a' reinforced seam l l the side of the bag is provided with agusset l2, and

at the upper end of thegusset the corner of the bas is folded in to form a valve il. The construction so far described is in accordance with the bag disclosed in the aforesaid patent.

m the improved construction'shown, the sides ..35A of the valve are adhered to the inner surfaces of the bag walls at. Il. When the bag is filled and expandedA .the side walls are spread apart and bent along the lines Il, which may be referred to for convenience as shoulders." For best results the adhesive between the valve and thebag walls should extend at least close to the shoulder line. In the construction shown in Figs. l and 2,l the adhesive is extended at Il somewhat below the shoulder line. When the bag is iilled and the bag walls are separated and bent outward to the position in which theyI are shown in Fis. 3. the walls of the valve are likewise spread laterally.l The adhesive at It is'torn away to the shoulder line.

The strain of this tearing-away insures j the spreadingof thevalve.

In the form shown, the `edges of the valve are shown slit at I'l at the ends of where folds Il will empty'. and at the point where the wall of the valve must be straightened when the valve is spread to the position in which it is shown in Fig. 3. These slits at the ends of the fold lines lessen the resistance ofthe paper or like material to bending along-these lines. and therefore reduce the resistance to a spreading of the valve to the form lnwhichitisshowninr'ig.'3.andthisassiststhe action of the adhesive in securing a proper closing of the valve.

In the absence of adhesive I4 or its equivalent, the material of the valve may fold along irregular lines vor at improper places, so that sometimes openings are left through the valve where material may escape. It will be readily seen that when the valve is proper-ly spread as indicated in Fig. 3 the lower layer of the valve lies flat against the upper layer ofthe valve and securely closes the outlet.

Bags of this type are customarily made of a plurality ofA layers of paper. Where adhesive is employed as shown in Figs. l, 2 and 3 between.

the inner layer of the wall and the adjacent layer of the valve, the spreading of the exterior layer Y of the' valve is insured. Usually the inner layers of the valve follow themovement which the -outer layer is thus compelled to take, so that the valve is properly closed. However, -it sometimes hapthe movement ofthe outer layers, and this .may result in imperfect closing of the valve. Where particularly perfect closing is necessary, and especially where there are a good'many layersof paper so that the inner layer of the bag wall is relatively thin compared to the total thickness of the, bag wall, it may be worth while to secure the several layers together in the valve wall, or the bag wall, or both. This may be done by adi hesive between the plies. f

Spots of adhesive'may be used instead of the relatively extended complete layer indicated in thedrawing, vand other obvious changes may be P made within the scope of. the appended claims.

What I claim is: l l. A bag having its end closed by a straight'- line seam and-the corner ofthe bag at one end 1 of the seam folded in toform an inwardly extending valve sleeve substantially parallel with v said seam', the valve being spread longitudinally of the bag when the bag is empty and collapsed and'being arranged and proportioned to normally collapse laterally' of the bag when the bag is ililedwith the folded edges of the valve substan- A tially-at the shoulders of vthe-iilled bag, and the 2 e 2,soe,5ss

and insuring the nattening of the wall between the shoulders when the bag walls are spread.

2. A bag in accordance with claim 1. and having slits at the end of the valve along the shoulder lines and the line where the sleeve is folded parallel to the seam in the collapsed, empty bag,

the sleeve being relatively stil! where not slit.

HARRY STANLEY HANGEN.

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