US1605481A - Paper bag - Google Patents

Description

Patented Nov. 2, 1926.

" UNITED .STATES PATENT orificE;

- A JOSEPH W. TAGGART, OE WATERTOWN, NEW YORK, AssTGNoE lro TAGGAm BROTHERS i COMPANY, INC., oF WATEETOWN, NEW YORK, A'COEPOEATION on NEW Yoax.

PAPER BAG.

appneauon mea Marcas, 1925-. serial Nn. 13,244. v

'This invention relates to aper bags in general, and has especial re erence to the production of relatively large -heavy and coarse bags that 4are commonly made from manila rope and other stock""fro m which strong paper bags are made, and are usually employed for packing coal, cement, plaster,

lour and various other pulverized products. The object ofthe present invention is to improve the construction of ,paper bags of the class named, and particularly the meth-A od of forming and closing thel bottom ends of the bag, which are usuall made from prepared tubular stock, where y a more ef-" certain portions of the bottom end of the' tubular blanks, and then to crease the opposite side portions adjacent the slits, in a manner to eliect the substantial overlapping of the severalseries of bottom iaps, where foi'- merly but one seriesof flaps have been overlapped. A further object is to apply the adhesive, by which the .lap-joints are cemented and sealed, to the outer face ofthe bottom after one series of flaps have been folded towards each other,and while the other series of flaps arel still extended, the zone of said adhesive being elongated, and the linear dimension of said zone being disposed in the line 'of the longitudinal axis of the tube, whereby the said adhesive may be applied at one operation, to the corresponding portions of. both series of flaps, for effecting a powerful seal of the primary, as well as the se'condary'joints of the bottom, when all of I -said iiaps are finally folded. And a particular object is to provide a bag ofv the class suitable for packing and transporting carbon-black, and similar extremely light and iiul'l'y materials, whose particles 4are as light and as searching as air, and are therefore liable to escapethrough the smallest gaps or openings-in the joints, during the handling ofthe 'filled bags.

I attain these objects by the means set forth in the detailed description which follows, andas illustrate-d bythe accompanying drawing, in which- Figure 1 is a plan view'of la prepared tu- A bular blank, from which my improved bag 1 is made showing by dotted-lines the creases by which the several bottom end flaps are formed. Fig. 2 isy an edge view of the tube;

showing the bottom end partially folded..

Fig. 3 is a front.l face view of the tube shown in Fi 2; showingthe opposite lateral flaps folde 'inwardly and 'i substantially overlapped -in the line of the longitudinal center of the tube; the oppositely arranged side flaps .beingl extended; also showing the elongated shaded zone which represents the adhesive'. the side flaps folded towards each other, for covering the lap-'joint of the lateral flaps; also showing the overlapping of the side flaps which adhere to each other as Well as to the lateral flaps. Fig. 5 is an edge view of the bag shown in Fig. 4. Fig. 6 is a view of the bottom end, taken in the direction of ive -ping of the lateral flaps. Fig. 7 is a broken A I the arrow in Fig.- 3; showing the overlap- Fig. 4 is .asimilar view, showing plan view of a modified construction, showing the lugs ofthe side flaps folded inwardly'upon Athe joint of the lateral fla s prior to the applying of the side flaps are secured.. d ig'. 8 is a broken edge view of the Amodified construction illustrated in Figure 7." Y

In the drawing, 2 represents the tubular g5 blank from which the bag is formed, and comprises front and rear sides 22", which are joined b lateral folds 2b, the side 2 being forme by overlapping similar laterof the tube being disposed substantially in the line of the longitudinal axis ofthe tube,

asteby'w ich the and being 'suitably pasted, in a well-known manner. 3 represents the top, and 4 the bottom end of the blank. Preparatory-to forming the usual bottom flaps, the end 4 is slitted longitudinally for providing similar integral front and -rear lugs or tongues 2e-2, and the said end portion is also creased, as shown in Fig. l, for facilitating the subsequent angular Vfolding and overlapping of the portions of the tube that comprise the bottom of the completed bag,

as may be understood by viewing Figs. 1,

, d in Rother, and also overlaps the said margins,

a, a and e. After the tube 2 is slated andcreased as described, it is Ifed into the usualv bottoming -machine (not shown), which initially spreads fin a well-known manner the open bottom, and then lfolds thejffront and rear lateral triangular portions 'Q5-5'- on the. angular creases for producing the diamond-shaped configuration, 'shown l'in vFig. 3. This brings the corresponding'bottom end margins 4i--4a parallel to eachk as at 4b 'the said lap preferably .beinglocated substantially in thev line of the longi- -tudinal seam 2", as shown in Figs. 3, 6 and 7. This leaves the lugs 2f-2f'extended beyond and in line with the joints 2 and 4b. While the bottom end is still extended, as

- shown in Figs. 2 and 3, the tube is carriedv along by the machine, to a point where an adhesive, (see shaded portions of Figs. 3 and-7), is appliedpreferably in the form of an elongated zone or strip, as 7 which coincides with and preferably extends ylaterally 2 is again carried forward in the machine,

andthe front side iap 8, which'comprises corresponding portions of the flaps 5-5, and is rendered foldable by the transverse and longitudinal arms of the 'crease ,8 of,

85- the front side 2- of the tube, is next folded inwardly upon, and partially overlaps, the lateral flaps 5 5. after which the rear or opposite side flap 9, which comprises 'similar portions of the flaps 5-5 and is foldable on the creases 9', is finally folded inwardly upon'the remaining portions of the lateral naps, and also upon'the side flap l 8, as best seen in Fig. 4. This completes the folding and sealing of the bottom of the bag. It will be understood from the foregoing that the lateral flaps 5--5,'as well as the side flaps 8-9, are all treated with the adhesive 7, as shown in Figs. 3 and 7, and

when the side iaps 8 and 9 are folded, as shown in Fig. 4, the complete adhesion of all of the bottom parts is effected by the meeting of the asted portions of the sev- -eral flaps. and 1n a .manner to elfectually seal the'portion vof the joint 4", which lies between the creases 8 .and 9(see Fig. 3)', as well as the portions of the said joint,

" which extends across the adjacent portions of the side'flaps. The lug 2 also contributes its share to the'sealing of the joint 4", and both of the lugs (2"-2f) also perform a particular and valuable function in that they effect the sealing of openings .10, which occur at the bases offsaid lugs` (seeFigs.

3 and 6), which might, except for the provision of Asaid lugs, gape open. The joint 4b being disposed well wit-hin the zone of ther adhesive, more or less of the paste 7 enters between the overlapped margins 4-41, and tends to seal saidjoint independently of the lsealing effected by the sideflaps 8 and 9. This pasting land sealing of the joints 4b is enhanced l somewhat by the serirating of the edgef-4, which vgreatly increases the marginal contour that receives theadhesive. In practise, this serrated edge, byreason of the capillary action of the paste, -is found to be effectively sealed before the side 4flaps are folded.

In Figs. 7 and 8, the lugs 25--2f are shown folded inwardly upon the side flaps, for closing the open ends 10, before the linal pasting and folding of the side flaps, 8

and 9. This modification, while necessitat.

ing one or more extra operations, has the merit of more effectively sealing the overlapped ends 10 of the lateral flaps.

My invention is extremely simple, and can be applied to paper bags without any extra labor and cost, as compared with the old styles or makes of bags, and the said improvement may be applied to tubular blanks that have been previously made and stored away long enough for the main sideA joints 2c to become dried and set, instead of performing the bottom-closing operations im' mediately after -the tubes have been' formed, as has been the custom heretofore.

Obviously some changes or modifications of the method and the resulting structure of the bags may be made,without departing from the spirit of the invention, but I wish it to be understood that the essential and yvaluablev features of my invention, to which I llay particular claim in this application, reside inthe slitting of the end margin 4-4 of the-tube 2, for providing the tongues 2"'-2f, and the provision of the angular creases 5a, which diverge from the bases of the said tongues,.and by-Ineans of which the lateral portions 5 5 may be folded in a manner to overlap the margins 4-4, for

eifectually closing and sealing the normal bottom embracing the diamond-shaped field, shown in Figs.l 3 and 7 in combination with the construction and arrangement of the ` integral side fiaps 8 and 9, which areadapted *to be folded and overlapped upon the joint 4b, in a manner-to effect a double seal, and at the same time suitably reinforcing the bottom of the bag, at its'weakest points.

Havingthus described my invention, what I claim, iss A paper bagA comprising a tubular blank having its front and back wall portions at its bottom end each provided centrally of its side edges'with a pair of relatively short closely arranged longitudinal slits forming similar relatively narrow short tongues, the blank being formed with creases diverging from the bottom of said slits whereby the lateral portions between said creases and the bracing the overlapped marginal portions bottom end margins ma be ex ended 'and tions at'either side bein? folded transversely v1o folded towards each ot er an providing substantiallygpidwayo their length in overfor effecting the overlapping of t e bottom lapping relationl nponthe overlapped marmarginal edge portions in the line of the ginal edge portions-and cemented vthereto l longitudinal axis of the blank for substan and to each other', saidtongues being first tially the full breadth of the expanded botfold d inwardly upon and cemented to the 15 tom, and an adhesive applied 4to la zone emsaid folded lateral portions. i

In testimony whereof I affix my signature.

- JOSEPH-W, TAGGART.

and said tongues, said folded lateral por-

Images