US2522200A

US2522200A - Method of filling containers

Info

Publication number: US2522200A
Application number: US645079A
Authority: US
Inventors: Jr Charles A Southwick
Original assignee: Shellmar Products Corp
Current assignee: Shellmar Products Corp
Priority date: 1946-02-02
Filing date: 1946-02-02
Publication date: 1950-09-12
Anticipated expiration: 1967-09-12

Description

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4NNIINOD oN FILLING CONTAINERS Filed Feb. 2, 194s NIMH!! Sept. l2, i9@ c. A. som-HWICK, JR

METHOD oF FILLING CONTAINERS v2 sheets-sheet 2 Filed Feb. 2, 1946 BY awww-L56 @LWN/WW) Patented Sept. l2, 1950 METHOD OF FILLING :CONTAINERS CharlesA. Southwick, Jr., Mount Vernon, Ohio, assignor to Shellmar Products Corporation, Mount Vernon, Ohio, a corporation of Delaware Application February 2, 194,"Seria1No. 645,079

5 Claims. 1

This invention relates to improvements in bags and methods of filling the same, having particular reference to a multi-wall bag structure in which an inner liner bag is partially inserted within an outer reinforcing bag to the end that the inner liner bag readily can be lled, sealed and dropped to the bottom of the outer bag, whereupon the outer bag can thenbe secured together, preferably free of the inner bag, and the provision of such a bag structure and method of filling and closing the same is a principal object of the invention.

Conventional multi-wall bags made of paper, cloth or composite materials are not moistureproof or airtight to any appreciable extent. This is due in part to perforations in the bag structures occurring during the stitching or sewing operations in providing the bottom and top closures. Such bags are also provided with overlapped vertical back seams which are glued together. Corrosive or chemically active ingredients packed in such bags will attack the glue in the seam from the inside of the bags and break down the seam constructions. Such bags when filled lack proper and desirable hermetically sealed characteristics. Furthermore, such bags are not lined or coated to impart greaseproof properties thereto.

Generally, it is another object of the invention to overcome the foregoing difiiculties and other disadvantages by providing such a bag with an insertable inner liner bag whereby the composite structure readily can be filled and sealed for shipping.

More specifically, it is an object of the invention to provide a multi-wall bag structure and method of iilling the same in which an outer reinforcing bag is utilized having an inner liner bag with an inner area equal at least to the inner area of the outer bag, with the inner bag inserted within the outer bag so that its bottom is spaced from the bottom of the outer bag a substantial distance with the top of the inner bag extending from the top of the outer bag, whereby the bottom of the outer bag can be squeezed together below the bottom of the inner bag, the inner bag filled and sealed so that it can be dropped to the bottom of the outer bag and the latter closed and secured together across the top.

Other objects of the invention will in part be obvious and will in part appear hereinafter.

The invention accordingly comprises the several steps and the relation of one or more of such steps with respect `to each ofthe others, .and

. 2 the article possessing the features, properties, and the relation of elements, which are exemplied in the following detailed disclosure, and the scope of the application of which will be indicated. in the claims.

For a fuller understanding of the nature and objects of the invention reference should be had to the following detailed description taken in connection with the accompanying drawings, in which:

Fig. 1 is a view illustrating an outer reinforcing bag;'

Fig. 2 illustrates an inner liner bag for said outer bag;

Fig. 3 illustrates the inner liner bag partially inserted Within the outer bag; y

Fig. 4 is a view `of an inner liner bag as it appears when inserted in a gusseted outer reinforcing bag;

Fig. 5 is a sectional view illustrating the composite bag structure set up for lling;

Fig. 6 is a sectional view illustrating the composite bag structure being filled;

Fig. 'l is a view, partly in section, illustrating the sealing of the inner bag structure after filling;

Fig. 8 `is a sectional View illustrating the inner liner bag being permitted to settle to the bottom of the outer reinforcing bag;

Fig. 9 is a view, partly in section, illustrating the closing of the outer bag over the inner liner bag;

Fig. 10 is a side view of the iilled and closed bag of Fig. 9; and

Fig. 1l is a view, partly in section, similar to that illustrated in Fig. 9 showing the sealed inner liner bag joined together at its seam structure with the seamstructure of the outer reinforcing bag. f

Referring more particularly to the drawings there is indicated generally at I a multi-wall bag of the type, for example, used for packaging granular materials. Because of the weight of such commodities it is necessary that these bags 'v bevery strong and it is customary to make them in a plurality of layers Il to provide the necessary strength characteristics. An overlapped and glued seam construction is provided at I2. Such bags are conventionally sewn or stitched across the bottom as indicated at i3. After such4 a bag has been filled it is stitched across the top.

A bag of the foregoing type has great strength but because of the stitching in the seam area a suitable siftprcef, moisture-vaporproof ensisru` tion cannot be provided. Also, because of the overlapped vertical seam I2 there is a tendency for the bag to leak because the seam tends to break down when chemical or corrosive materials are packed in the bag.

In accordance with the principles of the present invention it is possible to utilize such a bag, or similar bag which will function as an outer reinforcing-structure, by the insertion therein of an inner liner of the type indicated generally at I5, Fig. 2. Such a liner may comprise any suitable brous or non-iibrous material which heatscalable characteristics. For example, such 'material as pliofilm could be used or suiciently heavy heat-sealing cellophane. 'The yliner Ybag may be of paper materialhaving an overall or marginal application of a heat-sealable material. If no heat-sealable material is used and the bag is made by marginal applications of any other suitable adhesive, the closure can be effected by a similar adhesive.

The inner linerbagiI'E-.can bemadefrom a single web 'ofsuch''inaterials folded transversely to provide 4a bottom closure as indicated at I6. The structure is then sealed'V marginally as at I'I to provide side Wall-seams.

4ffnother method-'of making `such a vbag -is to superpose tWo'- Webstof suchf material and 'marginally yheat-seal `the' Ibottom and opposite sides.

A further type of bag which can be utilizedin connection withg the presentv invention is to completely seal the bag, leaving a valve opening, or providing-suenan opening yby cutting away a portion of the bag whereupon the same can, -after nlling, vbe heat-sealed together. "Such a bag structure is more fully described anduclaimed in my copending application-Serial No. 627,643, filed November 9, 1945.

In any event, where it is desired to provide a moisture-vaporproo'f innerflinerffand one which will be greaseproofa Webv'of material should be used' which inherently `has such characteristics; or a web should be used whichhas-an Yoverall coating of a suitable surfacing-magent whereby such characteristics, includingv'heatesealable `.properties, will be provided.

itis an important 'feature' of the invention that the inner surface' area oftthe :innerfliner bag `be at least equal to the'ffa'r'eaofthe-inner-surfa'ce of the outer Wall 1bag. -In lfact, vit is preferable to have the inner"walltbagsomewhat oversize'vas compared with the outer wall bag as illustrated in Figs.' lill 'of thedrawin'gs.

The inner liner bag should belpartiallyfinserted Within the Oniferi-reinforcing bag so that the bottom of the inner' bag iis spaced a substantial distance 'from -the bottom bf-hthe v'outer""vvall 'bag las depicted in FigJE. v-"lChis'Tv/fill;permit'the'liinner wall bag I5 to extend approximately an equal distance beyond the top `vof-the outer Wall bag.

Preferably, the margin'al verticalifse'ams I',to gether vvi'thas much ofifthef'fadjacent inner-liner as is-neeessary, inayibfol'ded over` as lillus'trated in Fig. d lto insert thelsamefwith-in the 'outer reinforcing bag. Inthisngure theputerr'einforcing bag is' illustrated 'as' being of thegus'set'type. It should be understoodthat-ithefinventionfis 'intended to-ap'ply' to pcuchtypesor 'guss'ete'd types of 'bag-and this includesf-bththe inner liner" bag as well as the outer? reinforcing' `bag.

"The composite structure ofthe inner'liner -b'ag partially inserted in the outer reinforcing bag frnay be shipped in tiiiscondition. 'Because of the snug nt' of theinn'er 'liilef'bag withinl the outer reinforcing bag the former will not easily tend to GIS settle to the bottom of the outer bag or become separated therefrom. When such bags are separated from a stack they are quickly available for handling in connection with filling and sealing operations.

When an operator desires to fill such a bag he may pinch the outer Wall bag together at the bottom-just below the inner wall structure as more `orless-diagrammatically illustrated in Fig. 5. A guide mark on the outer bag can be utilized to 4.indicate the position of the bottom of the inner ybeoperated manually, by a foot treadle, or autoymatically.

As soon as the mounted composite bag structure hasV been moved under a filling spout I9 the bag may be iilled as illustrated in Fig. 6. The Weight of the material will tend Ato bulge'thewalls ofboth bags outwardly. As soon-as the bag has bee'nilled theinneribag-Wll'be accessible for thev sealing. operation.

Insea'lingfit is easy -to bring the oppositefaces ofthe-mouth opening of the bag together and secure them-in position depending upon the type of liner construction used. That is, the mouth opening may bey adhesively sealed together Where a'heat-sealable material has not 'been' utilized in providing the liner-construction. If the liner has inherent heat-sealing characteristicsor is provided with a material which is heat-scalable, it is but necessary to apply heatI and pressureV to the mouth opening by means of 'conventional sealing irons' 20 (Fig. 7).

It-will'be appreciated that the operatorhas not found it necessary to reach down'vvithinv the outer bag to perform the sealing operation. Because of the fact thatth'e inner lliner bag projects a considerable distance above the reinforcing bag, the closing operation is comparatively simple because of the accessibility of the 'mouth closure of the inner bag for sealing purposes.

`As soon as the inner bag has been filled and sealed the 'clamping members I8 can be moved apart a suflc'ient distance' to permit .the inner bag to settle to the bottom of the outer bag. "This can be done by holding the sides of the outer bag either by mechanical or-Inanual means.

vAs soon as the bag' has settled into thefposition illustrated in Fig. 8 tl'lesealedportion ofthe inner liner indicated generally at ZI, preferably is folded over as Iindicated at22 in Fig. 9. Ilhe outer bag can then `be brought together and vsecured by means ofY stitching as .indicated.,at=.23.

vIn the rnlodiiicationy shown .in Fig.y ll thefinner liner-bag -I i5 is secured to the .outer reinforcing bag -I-Il. 'IhisY-rnayvbe donetbyinserting .the sealed portion of the inner -linei` -betweenthe 'op posed faces Vforming the opening of the outer wall bag-andstitching both togetheras indicated gcn erallyy at 223. Care should-beI taken-that the stitching entersy through the sealed portion 4of the linner bag so thatwt-her-efis nopenetration in the throat area.

In the preferred' embodiment the closure ol' the inner linerfbag is folded'downwinto `the outer reinforcing bag so that the inner liner bag is completely free-fromeny attachment to :the outer bag. The fact that thefinner:liner'ibagfis at-.least ofthe saine inner surface area as the'-inncrsurface area of the'outerifwal1"bag,` orpreferably somewhat oversize will prevent ipressure 'exerted by the weight of materials from rupturing the inner liner bag. l

It will thus be seen that the objects hereinbefore set forth may readily and einciently be attained and since certain changes in carrying out the above method, and certain modifications in the article which embody the invention may be made without departing from its scope, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A method of filling composite bag structures of the kind described which comprises providing an outer reinforcing bag and an inner liner bag. of at least equal inner area to said outer bag, i

inserting said inner bag within said outer bag so that its bottom is spaced from said outer bag a substantial distance with the top of said inner bag extending from the top of said outer bag, squeezing together the bottom of said outer bag below the bottom of said inner bag, lling said inner bag, closing and securing together the top portions thereof, permitting the inner bag to settle to the bottom of the outer bag, and closing and securing together the top portions of the outer bag above the inner bag.

2. A method of filling bags of the kind described which comprises providing an outer reinforcing bag and an inner liner bag of at least equal inner area to said outer bag, inserting said inner bag within said outer bag so that its bottom is spaced from said outer bag a substantial distance with the top of said inner bag extending from the top of said outer bag, squeezing together the bottom of said outer bag below the bottom of said inner bag, lling said inner bag, adhesively sealing together top marginal wall portions thereof, permitting the inner bag to settle to the bottom of the outer bag, and closing and securing together the top of the outer bag above the inner bag.

3. A method of filling bags which comprises providing an outer reinforcing bag and an inner liner bag of heat-scalable material and of at least equal inner area to said outer bag, inserting said inner vbag within said outer bag so that its bottom is spaced from said outer bag a substantial distance with the top of said inner bag extending from the top of said outer bagzsqueezing together the bottom ofy said outer bag below the bottom of said inner bag, filling said inner bag, heat-sealing together top marginal wall portions thereof, permitting the `bottom of the inner bag to settle to the bottom of the outer bag, and closing and securing together the top of the outer bagabove the inner bag.

4. A method of filling bagsy which comprises providing an outer reinforcing bag and an inner liner bag of heat-scalable material and of at least equal inner area to said outer bag, inserting said inner bag within said outer bag so that its bottom is spaced from said outer bag a substantial distance with the top of said inner bag extending from the top of said outer bag, squeezing together the bottom of said outer bag below the bottom oi said inner bag, filling said inner bag, heat-sealing together top marginal wall portions thereof, permitting the inner bag to settle to the bottom of the outer bag, and stitching together top marginal wall portions of the outer bag with said marginal wall portions of said inner bag secured between the stitched top marginal wall portions of said outer bag.

5. A method of filling composite bag structures oi the kind described which comprises providing an outer reinforcing bag and an inner liner bag of at least equal inner area to said outer bag, inserting said inner bag within said outer bag so that its bottom is spaced from said outer bag a substantial distance with the top of said inner bag extending from the top of said outer bag, squeezing together the bottom of said outer bag below the bottom of said inner bag, lling said inner bag, closing .and securing together the top portions thereof, permitting the inner bag to settle to the bottom of the outer bag, and closing and securing together the top portions of the outer bag.

CHARLES A. SOUTI-IWICK, JR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number