US2000928A - Bag and method of making same - Google Patents

Description

May 14, 1935. R, N. CUNDALL ET Al.

BAG AND METHOD 0F MAKING SAME Filed Jan. 1o, 1951 Patented May i4, 1935 PATENT OFFICE l amm l BAG AND mamon or mama sans neben N. cansan, Hamburg, ma william n. Powell,L Buifalo, N. Y., assignors, by mane al- 'signmentia to Bamm-Inc., a corporation of Delaware Application January 1o, massaal No.- 507,874

This invention relates to a bag and .method of sealing the same and more `particularly tomultiple walled bag adapted to contain powered materials, such as flour, sugar, lime, plaster, gypsum,

fertilizers and the like, in which it is not only necessary to close the bag in such manner that the fastenings at the mouth oi the bag will not break or loosen but also to provide a seal which prevents the leakage or sifting out of the contents when the bags are handled either when the bags are inverted or when they are set down and the material tends to blow out through the impact of setting the bag down.

In the development of open mouth paper bags for use as larger sized packages of powdered materials it has been found desirable to make them withthe walls of a number of thicknesses of paper. As there is a limit to the strength which can be obtained from a single thickness of paper the most effective way to provide the necessary. strength for large bags has been found to provide a bag having a number of walls or in effect a single bag' made of a number of bags set one within the other. This not only provides the requisite strength but also permits of employing a moisture-resistant bag or wall as the outer wall which can be thin and inexpensive and not only protects the con-- This speciiiciion is-a companion to the appli 40 cations of Robert N. Cundall, Serial No. 507,615, illed January 9, 1931, and Serial No. 507,616, illed January 9, 1931.

One of the principal objects of `this invention is to provide a bag for finely powdered or dusty materials in which the mouth of the bag is closed in such manner as to provide a strong, durable and permanent closure and seal which is also sift- Vprooi and 4entirely prevents the fine, dusty materials from sifting out through the closure.

Another purpose is to provide a bag which when closed is as strong at the mouth or place of sealing as any other portion o! thebag.

Another aim is to provide a bag of this character terial falling into the contents oi' the bag.

' facture.

in which there is no danger of the sealing ma.

A-further object is to provide such a bag land process which permits of the sealing of the bag to be provided by automatic processes and avoid all hand operations.v

'A still further aim is to provide a bag which is lneat in appearance and can be provided with a Atransporting goods which are relatively valuable and subject to pilfering.

In the accompanying drawing:

Fig. 1 is a fragmentary perspective view of a bag made in accordance with our invention.

Fig. 2 is a fragmentary end elevation thereof. Fig. 3 is a fragmentary vertical section .through the form of bag shown in Fig. 1.

Fig. 4 is a fragmentary top plan view of the form of the invention shown in Fig. 1 showing the same preparatory to sealing.

Fig. 5 is a fragmentary vertical section through a modified form oi' the invention. l

Fig. 6 is a fragmentary perspective view of a still further modified form of the invention.

Fig. '7 is a vertical section through the modied form of the invention shown in Fig. 6.

Fig. 8 is a vertical section showing another modification of the present invention.

Fig. 9 is .a perspective view showing a still further modincation of the present invention.

Fig. 10 is a vertical section through the form of the invention shown in Fig. 9.

In the present application the invention is shownasembodiedinabagwhichisalready formed, i. e. in closing and sealing the mouth of.

a fabricated bag, but it will also be apparent that the invention can be embodied in closing and sealingthebottomsofbagsduringtheirmanu- Oneofthemcsteifectivewaysofclosinga multiple walled bag' containing dusty materials is by stitching the sides of the mouth of the bag together with cotton thread. Stitching through the sides of the mouth of the bag, however, has the effect of weakening the bag and dusty materialswillleakthroughthetopofthebagbetween the stitches.' in .the stitching of the.`

bagthestitchingneedlemofeoursalargerthan the cottonthreadusedinstitching and therefore the needle punches a larger hole through the, wa'llsofthebagthantheihreadllsandthese large holes permit the dusty material to escape through the `holes in the bag around the thread. The most effective way that has been found to vmake va. bag tight or sealed at the opening is by some form of gluing. Inasmuch, however, as the principal object of employing a. multiple walled bag is to obtain the required strength it is obvious that incases where great 'strength is needed unless some methodof reinforcing this seal is obtained, it will not be as strong as the walls of the bag. The present invention therefore proposes to combine stitching and gluing in such manner that the stitching provides a closure of the necessary strength and the gluing not only seals the bag at the closure but also strengthens the stitching. While the invention proposes the use of stitching and gluing it will be apparent that in place of the stitching another form of fastening which extends through the walls of the bag could be employed, such as staples, and that while glue is preferable any adhesive or plastic hardening material can be employed, preferably one that is quite liquid at the` time of application and will harden to a stiff gummy condition. such a. condition being preferable to a glue which becomes brittle.

'Ihe invention is shown as embodied in a multiple walled bag having an inner wall Ill and an outer wall II, such a. multiple walled bag being in effect one bag within the other, although the invention can' be embodied in a bag having any number of walls. Such a multiple walled bag is made in any suitable manner to provide a mouth I2 at its upper end which when furnished to the packer can be opened up and the materials deposited in' the bag.

In the form of the invention shown in Figs. 1-4, when the bag is furnished to the packer one of the sides of the outer wall II of the bag is extended upwardly to form a flap I3, this ilap being substantially equal in length to half the circumference of the vmouth of the bag and extending from one end of the mouth to the other. The bag so furnished also has aslit M provided at each end of the mouth I2 in the outer shell or wall II and extending downwardly from the mouth of the bag.' y

The bag is furnished to the packer in a collapsed or flattened condition, the packer opens up the mouth of the bag and deposits the dusty or powdered materials through the mouth I2 into the bag. He then runs the mouth of the filled bag through a sewing machine and closes the mouth of the bag by a row of stitches I5. In so lopposite end sothat when the bag is sewed in this manner a secure and tight closure is provided for the mouth of the bag.

-In the absence of provision to prevent it, however, the dusty or powdered materials contained in the bag would leak out through the mouth of the bag past the stitching I5. Also since `the needle of the sewing machine must necessarily be larger than the thread I5 the holes I3 formed by the needle are of greater size than the thread I5 and some leakage is liable to occur through these holes I6, particularly when the bag is set down with some force. To prevent this the present invention proposes a seal of glue or some other.

hardening plastic adhesive. "With the form of-the plied to the whole of the inner face of the flap or wing I3 extending down to the bottom of the slit I4. This glue can be applied automatically by means of rollers or brushes or in any other suitable manner. After this glue is applied the flap I3 is bent around the upper end of the mouth of the bag and down on the opposite side so that its glued -face engages the upper end ormouth of the bag and also the opposite side, as best shown in Fig. 3. After being so bent the mouth of the bag and the iiap I3 is passed between rollers so that the flap I3 is securely glued in position and at the same time a part of the glue II is forced into the holes I8 thereby filling out the excessof these holes and preventing the powdered materials from entering the same. It will be observed that in this form of the invention not only does the glue I'I completely seal the mouth of the bag and the oversize holes I8 caused. by the sewing machine needle in stitching but it also strengthens vthe stitches I6. In order that these stitches tear loose it is necessary thatl they be pulled through the walls of the bag and by embedding these stitches in glue and also causing them to adhere to the flap I3 such pulling through of the stitches is entirely prevented in any normal handling of the bags.

In the form of the invention shown in Fig. 5, the outer shell or wall II of the bag is extended upwardly on both sides of the mouth I2 and this outer shell or wall II is slit at the ends of its mouth in the same manner as the slit I4 in the form of the invention shown iii-Figs l-4. This provides in eiect two opposing flaps 2| and 22 Which extend upwardly from opposite sides of the bag. In sewing the bag these flaps 2I and 22 are bent downwardly into a horizontal position and the stitching I5 is started atone end of the mouth of the bag and passes through the opposite walls of the inner shell I0 and intermediate shell I0-a. Al layer of glue 23 is then applied to the inner or upper faces of the flaps 2I and 22. The flap 22 is then bent over 'the mouth of the bag and then' downwardly so that its glued face engages the mouth of the bag and also the opposite outer side of the intermediate wall or shell Ill-a. This flap 22 is then rolled or pressed so that its glue forms a firm bond with the mouth of the bag and also a part of this glue is forced into the oversized holes I8 formed during the sewing operation thereby plugging these holes and preventing the Aescape or loss of any dusty material therethrough. Thereafter the other nap 2| is bent around the outer face of the flap 2 2 and is rolled down so that its glue I6 forms a firm bond with theflap 22. It is therefore apparent that the mouth of the bag is securely closed by means of the stitching I5 and that at the same time this stitching is reinforced and the mouthof the ba'g and the stitching sealed against the escape of material by the glued flaps 2| and 22. l

In the form of the invention shown in Figs. 6 and I one side of the outer wall or shell I I is extended upwardly to form a flap I3 as in the preferred construction shown in Figs. 1-4 but the bag invention shown in Figs. 1-4 this glue I'I is apis .inprovided with the slit I4 at opposite ends of the mouth of the bag. In this form the flap I3 remains in an upstanding position during the sewoperation and the stitching I5 lextends through all of the walls of the bag and sews its opposite sides firmly together to provide a closure for the mouth of the bag. A layer of-glue I9 is then applied to the crresponding face and upper part of the flap I3 and this flap is folded over the mouth of the bag and downwardly so that its glued face engages the opposite side of the bag and also the exposed part of the stitching I5. This flap I3 isv then rolled down to secure a good bond between it and the opposite side of the bag and also to cause a part of the glue to be forced into the oversize holes I8 formed by the sewing machine needle in stitching. At the same' time a layer of glue 20 is applied to the stitching at the opposite side of the bag, this glue eniering the oversize holes I8 from that side of the bag and insuring an adequate and perfect seal of these holes so that the dusty material cannot escape therethrough. t

In the form of the invention shown in Fig. 8, the bag is formed with the ap I3 in the'same manner as in the form of the invention shown in Figs. 6 and 7. Before sewing the bag, however, a layer of glue 24 is applied along one side of the inner wall III. of the bag immediately inside its mouth I2. sewing machine the sides Aof the bag are rolled down so that this layer of glue 24 forms a seal for the mouth of the bag. The stitching is started at one end of the mouth of the bag and extends through the opposite sides of the bag so that all of its walls are sewn together. In providing the stitching I the holes I8 formed by the sewing machine needle are, of course, larger than the thread I5 and consequently in the absence of provision to prevent lit the dusty material would leak out through these holes. To prevent this a layer of glue 25 is applied to the exposed stitches at one side of the bag and forced into the stitching so that a part 'of the glue enters the holes I8 from that side of the bag and simultaneously another layer of glue 26 is applied to the opposite side of the bag at the stitching so that the glue entersthe holes I8 from the opposite side and completes the sealing of the holes. The i'lap I3 is then folded over the mouth of the bag and down the opposite side thereof and rolled into place so as to form a firm bond with y the layer of glue 25. It is also obvious that the layer of glue could be applied to the flap I3 instead of the body of the bag if desired.

In the form of the invention shown in Figs. 9 and 10, the invention is shown as applied to a gusseted bag. In this form thebag composed of the inner shell or wall I 0 and the outer shell or wall II is provided with an end wall or gusset 21 so that the bag when opened is of rectangular form in a horizontal section.

In this form the mouth ofthe inner wall or shell I0 is brought together and folded as indicated at 28 so as to provide an interlock. One side Wall of the outer shell II is extended upwardly to provide a flap I3 similar to the flap I3 shown in the form of the invention illustrated in Figs. 6 and 7 and a layer of glue 29 is applied to the inner side of this flap I3. This flap I3 is then folded down over the top of the bag and the interlock 28 and down against the opposite side of the bag so that it covers the bag and forms a s eal which prevents the escape of any of the powdered or dusty material. In this form of the invention sewing or stitching is not employed, although it could be if desired.

It will be noted that the invention has been shown' and described as embodied in the sealing When the bag is put through the of a bag already fabricated. It is obvious, however, that the invention can be embodied in closing the bottom of the bag as well and that' the bag can be closed and sealed at both ends in accordance with the invention and the invention is therefore tovbe construed as equally applicable to this use.

It is apparent from the foregoing. that all of the forms of the present invention provide a bag in which the closure is strong and durable and equal to any other portion of the bag; the bag is sealed so as to be sift-proof at this closure; there is no danger of bits of glue breaking and falling into the contents of the bag so as to contaminate the contents; the seal is neat in appearance and the closing and sealing of the bag can readily be effected by automatic means. It will also be observed that the sealing not only seals the closure so as to prevent the filtering out of the dusty materials which the'jbag is designed to contain but also strengthens the closure.

Each of the forms of the invention seals the bag so as to prevent contamination thereby permitting its use for foodstuffs and also provides a seal which is pilferproof thereby permitting its use forv shipping valuable materials which are particularly subject to pilfering.

While the bag has been shown and described with particular reference to a multiple walled bag it is apparent that some features of the invention can be embodied in a single walled bag and the invention therefore also comprehends this application.v

We claim as our invention:

1. A bag comprising a multi-walled tubular body made of flexible material and having a mouth at at leastA one end and the outer wall at at least one side ofsaid 'bag being extended to form a flap adapted to embrace the other walls at the mouth of the bag, means for fastening together the opposite sides of said other walls at the mouth of said bag and a hardening plastic material covering all of the exposed parts of said fastening meansand sealing the mouth of said bag and atleast a part of said hardening plastic material securing said flap `over the mouth of said bag. p v v 2. A bag comprising a multi-walled tubular .body made of flexible material, and having a mouth at at least one end and the outer wall at at least one side of said bag and adjacent said mouth being extended to form a iiap, fastenings extending through opposite sides of the inner wall of said bag atA its mouth and forming a closure therefor and a hardening plastic material securing said flap over the mouth of said bag, said hardening plastic material forming a seal for the mouth of said bag and also a seal for the opposite ends of the holes made in said bag by the penetration of said fastenings.

3. A multiple walled bag comprising a multiple walled tubular body made of flexible material and having a mouth at at least one end, the outer wall of said bag projecting outwardly beyond said mouth at at least one side `of said bag, fastenings extending through opposite sides of the inner wall of said bag adjacent its mouth and an adhesive for securing said iiap over the mouth of said inner wall', said flap covering the exposed vparts of said fastenings at at least one side of said bag. l

4. A-multiple walled bag comprising amultiple walled tubular body made of flexible material and having a mouth at at least one end, the outer wall of said bag being slit inwardly from the mouth at diametrically opposite places and said outer wall between said slits and on at least one side being extended outwardly to form a flap,l fastenings extending through opposite sides of the mouth oi!` an inner wall and forming a closure for said mouth, and a hardening plastic material securing said ap over the mouth of said b ag and sealing said closure and also the openings made in said bag by the penetration of said fastenings.

5. A multiple walled bag, comprising a multiple walled tubular body made of exible material and having a mouth at at least one side, the outer wall of said bag being slit inwardly from' the mouth at diametrically opposite places to points below the mouth of said inner wall and said outer wall between said slits being extended to form two outwardly projecting flaps, fastenings extending through the opposite sides of an inner wall to forma closure for the mouth of said inner wall, a hardening plastic material securing-one of said aps over the mouth of said inner wall and forming a seal for said mouth and also for each end of the holes made insaid inner wall by the penetration of saidfastenings, and additional hardening plastic material securing the other ap over said first iiap.

6.. The method of closing a multi-walled tubular body having a mouth at at least one end and the outer wall at at least one side of said body being extended to form a flap adapted to embrace the other walls at the mouth of the bag which consists in passing fastenings through the opposite sides of said other walls at the mouth of said body and applying a hardening plastic material to all of the exposed parts of the fastenings of said body and folding said ap over the mouth of said body so as to be held in such folded condition by said hardening plastic material.

7. 'I'he method of making a multi-walled lbag comprising at least two tubular bodies made of flexible material and-having a mouth at at least one end and the wall of the outer tubular body at atleast one side of said bag being extended to form atlap,which consists in passing1 fastenings throughopposite sides of the inner body of said bag at its mouth and forming a closure therefor and applying a hardening plastic material to said fiap and the mouth of the inner body of said bag thereby to secure said ap over said mouth and form a seal for the openings made in the walls of said bag by the penetration of said fastenings.

8. 'I'he method of making a bag comprising a multiple walled tubular body made of flexible material and having a mouth at at least one end and the outer wall of said bag being slit inwardly from the mouth at diametrically opposite places and said outer wall between said slits and on at least one side being extended outwardly to form a ap, which consists in passing fastenings through `opposite sides of -the mouth of an inner wall to form a closure for said mouth and applying a hardening plastic material to said flap and securing said ilap over the mouth of said bag, said hardening plastic material sealing said closure and also the openings made in said bag by the penetration of said fastenings.

9. The method of making a bag comprising a multiple walled tubular body made of flexibleto form two outwardly projecting aps, which consists in passing fastenings through the opposite sides of an inner Wall, above said slits to form a closure for the mouth of said inner wall, applying a hardening plastic material to secure one of said'flaps over the mouth of said inner wall and forming a seal for said mouth and also for each endfof the holes made in said inner wall by the penetration of said fastenings and additional hardening plastic -material securing'the other flap over said iirst flap.

10. A bag comprising a multi-walled tubular body made of flexible material and having a mouth at at least one end, the outer wall of one side of said bag being extended to form a iiap projecting outwardly beyond said mouth and adapted to embrace the other walls at the mouth of the bag, stitching extending through the said other walls of said bag and closingsaid mouthv and an adhesive securing said flap over said mouth and the stitching at atleast one side of said bag.

11. A bag comprising a multi-walled tubular body made of flexible material and having a mouth at at least one end, the outer wall of said bag being extended to form a ap projecting outwardly beyond said mouth, stitching uniting the sides of the inner wall of said bag to close its mouth and an adhesive securing said ap over said mouth and securing said flap tothe opposite side of the bag.

12. A multiple walled bag comprising a multi-v ple walled tubular body made of flexible material and having a mouth at at least one end, the outer Wallof -said bag being slit inwardly from the mouth at diametrically opposite places and said outer wall between said slits and on one side being extended outwardly to form a ap, fastenings extending through opposite sidesof the' mouth of an inner wall and also through the side of said outer wall. opposite said ap, said fastenenings forming a closure for said mouth, and a hardening plastic material securing said ap over the mouth of` said bag and sealing `said closure and also the openings made in said bag by the penetration of said fastenings.

13. A bag comprising a tubular body made of flexible material and having a mouth at at least one endand the wall atl at least one side of said bag and adjacent said mouth vbeingvextended to r form a. projecting flap, fastenings extending through opposite sides ofthe wall of said bag at said bag by the penetration of said fastenings.

14. 'I'he method of making a bag comprising a tubular body made of flexible material and having a mouth at at least one end and the wall at at least one side of said bag being extended to form a flap which consists in passing fastenings through opposite sides of the wall of said bag at its mouth and forming a closure therefor, applying a hardening plastic material to said ap and mouth of said bag thereby to secure said iiap overthe mouth of said bag and form a seal for said closure and for the adjacent ends of the openings made in said bag by the penetration of said fastenings and applying additional hardening plastic material to the exposed parts of said fastenings on the opposite side of said bag thereby to form a seal for the opposite ends of the holes made in said bag by the penetration of said fastenings.

l5. A bag comprising a multi-walled tubular body made fof flexible material and having a mouth at at least one end and the outer wall of one side of said bag beingI extended to form a flap adapted to embrace the other walls at the mouth of the bag, means for fasteningtogether the opposite sides of the mouth of said bag and a hardening plastic material covering all of the exposed parts of said fastening means and sealing the mouth of said bag and at least a part of said hardening plastic material securing said flap over the mouth of said bag.

16. The method of closing a multi-walled tubular body having a mouth at at least one end and the outer wall of one side of said body being 'extended to form a flap which consists in passsuch folded condition by said hardening plastic material.

17. A bag comprising a tubular body having side walls made of an interior ply of flexible material and having a mouth at one end, an exterior reinforcing ply of exible material extended adjacent to and parallel with said4 mouth, stitching extending through said plies and closing said mouth, a sealing ap folded over the mouth of said bag and embracing the stitching on both sides and an adhesive securing said sealing flap in place.

18. As an article of manufacture, a bag composed of a tubular body made of plies of flexible material and having a mouth at one end, and means for fastening together opposite side plies of said bag to provide a closure, said fastening means comprising a line of stitches and an adhesive, at least one side ply of the bag material being formed with a freely extending flap adapt# l ed to be folded over to enclose underlying ends of the plies of bag material and said fastening means at both sides andto be secured adhesively thereto.

ROBERT N. CUNDALL. WILLIAM B. POWELL.

Images