US2378503A - Sewed double side seam bag - Google Patents

Description

3 Sheets-Sheet l W50 f6. I

H. A. ROHDIN SEWED DOUBLE SIDE SEAM BAG Filed Dec. v, 1942 a m- :g 2a II I I 1 a 17 g so I c lV28 I I I i I I I I I l ig@ -Ilif 1IIL 2 l f l I 'LL [I- 7'4 l I l I I -Howardf/leoug i @www /llg June 19, 1945v H. A. RoHDlN SEWED DOUBLE SIDE SEAM BAG Filed Dec. 7, 1942 Y 3 Sheets-Sheet 2 June l9, 1945. H, A, RoHDlN SEWED DOUBLE SIDE SEAM BAG Filed' Dec. 7, 1942 3 Smets-sheet s Patented June 19, 1945 UNITED STATES PATENT GFFICE l1 Claims.

This invention represents primarily an improvement upon my application, Ser. No. 455,483, filed August 20, 1942, and it is an object of the present invention to adapt the bag disclosed in the aforesaid application to fabrication from multi-wall paper structures, using sewed seams and closures instead of heat sealing or adhesive seams and closures.

It is a further object of this invention to provide in a bag having a tuck in type top or bottom certain means for facilitating the opening thereof.

The above and other objects will be made clear from the following description taken in connection with the annexed drawings in which:

Fig. 1 is a plan view showing the formation of a tube and the strikingif of suitable bag blank therefrom;

Fig. 2 is a section on the line 2-2 of Fig. 1;

Fig. 2-a isI a section on the line 2-a-2-a of Fig. 1;

Fig. 3 shows the bag blank with sewed side seams applied;

Fig. 4 shows the completed bag in flattened condition;

Fig. 5 shows the bag distended and ready for filling `when a rectangular cross section is desired for the body of the bag;

Fig. 5-a is a view similar to Fig. 5 but illustrates the distribution of the parts when a substantially circular cross section is desired;

Fig. 6 is a fragmentary perspective view illustrating-one form of closure for the bag of Figs. 5 and 5a; p

Fig. 6-a is a fragmentary perspective vview showing an alternative form of closure;

Fig. 7 is a plan view of a tuck inbottom bag of the double side seam type showing my improved opening means applled thereto;

Fig. 8 is a cross section on the line 8-8 of Fig. 7;

Fig. 9 yis a cross section on the line 9 -9 of v Fig. '1;

Fig. 9-a is a view similar to Fig. 9 butillustrating the bag in distended condition; and

Fig. 10 is a section on the line I0-I0' of Fig. 7.

The inventions disclosed herein, while entirely applicable to single-wall bags, have particular applicability to multi-wall structures. For the purpose of simplicity of illustration. however, I have shown single -wall structures throughout this disclosure. It is understood that in practice the actual bag structures, particularly those illustrated in Figs. 1 through 6-a, inclusive, will usually comprise from two to six and sometimes even more plies. Again for simplicity of illustration I have shown my improved bottom opening means as applied to a single end structure. Obviously, however, it is equally applicable to the double end structure shown in Figs. 1 through 6-a, inclusive,

y, and I do not intend to be limited to the application of the device of Figs. '7 through 10 to single end bags.

Referring now to Figs. 1 and 2, I form a continuous gusseted tube I0 having a lower gusset I2 and an upper gusset which comprises an inner fold I 4, an outer fold IG and in which edges I 8 and 2I'I project laterally beyond the outer fold I 6, with the innermost edge I8 preferably, though not necessarily, projecting slightly beyond the outer edge 20. 'Suitable bag blanks 22 are severed from the continuous tube and the side edges 24 and 26 of each blank are closed by sewing seams 28 and 30 which pass through the gusset folds I2 and I4.

The edges Iii and 20 are then similarly sewed together by seams 32 and 34 extending inwardly from the seams 23 and 30 and leaving a mouth portion 38 between them.

Figs. 5 and 5-a show the bag expanded and ready for lling. The body of the bag may assume either the rectangular configuration of Fig. 5 or the substantially circular configuration of Fig. 5a. Bags of this type are particularly useful in the packaging of material such as rosin or asphalt, whichis poured into the bag in molten condition and then permitted to solidify. When the weight involved is only to 150# the rectangular configuration is desirableand the depth of the gussets I2 and I4 would, therefore, be somewhat less relative to the width of the bag between the side seams 22 and 24. Where, however, 300# or more must be packaged it is desirable that the stevedores should be able to roll the package in the same manner in which they han' die a barrel or keg. For this purpose, therefore, the depth of gussets I2 and I4 is materially increased so that the width of each gusset when expanded approximates the distance between the inner folds I2 and I4 when the bag is in flattened condition. 'I'he result favors the formation of the roughly rectangular cross section of Fig. 5. As shown below,-Figs. 5 and 5-a, the projection of the edge I8 beyond the edge 2li facilitates expanding of the filling opening 36. This is an important matter when each of the edges I8 and 2l comprises five or six plies of paper, since otherwise it would be diiiicult to locate the true opening.

The relationship between gusset depth and the width of the bag (width being the center distance between side seams) is one which must be thoroughly mastered for a complete understanding of this invention. Then the gusset folds expand to form a wall lying in a plane at right angles to the bag length; the side seams are drawn toward each other. The distance they are drawn is a mathematical function of the depth of the gusset fold. Each side seam moves inwardly a distance equal to the depth of the gusset fold. As a result, the width of the expanded bag always equals the width of the flat bag diminished by twice the depth of the gusset. Since the width of the expanded gusset wall always equals twice the depth of the gusset fold, an approximately square (or cylindrical) cross section will be secured when. i-.e depth of the gusset is one-fourth the width of the bag between the side seams. As the depth of the gusset decreases below one-fourth the distance between seams, the cross section assumes more and more the form of an elongated rectangle. The same result would follow, in the opposite direction, by increasing the gusset depth to more than one-fourth the distance between seams, but this is rarely resorted to since the difiiculty of expanding the gussets increases with the depth of gusset.

The bag is filled through the opening 35 which is then collapsed and the edges I8 and 20 are stapled together as indicated at 40 in Fig. 6. If desired, as shown in Fig. G-a, a supplementary strip of sealing tape 42 may be applied over the filling opening and the tape, together with the bag mouth edges, may be stapled as indicated at 44.

Stapling this type of closure is favored because it can be accomplished through the use of a small hand-operated stapling device representing a minimum equipment cost. Obviously, however, if desired, whenever such facilities are already available, it is entirely proper to close the opening by a supplementary sewing operation. When the final closure is to be made by sewing, it may be desirable to omit the partial closures 32 and 34, or, at -any rate, to limit the length of these to the portions extending along the end walls in Fig. 5.

If for any reason it is desired to have the filling opening 36 project substantially above the plane of the upper gusset fold, the riml occasioned thereby may be folded against the body of the bag and, if desired, secured in such position by means of adhesive or tape or any other suitable means. Usually, however, the rim containing the filling opening will not project above the plane of the expanded upper gusset by more than the depth of the seams 32 and 34. Experience has long demonstrated that the projection of the fins occasioned by such seams does not adversely affect any of the handling or strength characteristics of sewed bags. Obviously, any form of seam having the requisite strength may be used. I have illustrated generally the type in which the seam is sewed through a reinforcing tape but it is not necessary to utilize this type since others will sufhce and the precise form of seam is immaterial to this invention.

Referring now to Figs. 7 through 10, inclusive, I show a bag 60 having a tuck in" bottom 62 and side seams 64 and 66. The tuck in" bottom. 62 forms, in eiect, a gusset and preferably, though not indispensably, I secure the opposed inner surfaces of the gusset folds 68 and 7 10 together in the area bounded by the lower corners of the bag and by lines at each corner running at 45 to the fold 62 and intersecting said fold at the point of its intersection with the side edges. It is important in this connection to observe that where this securement is resorted to the gusset folds 68 and 10 are not secured to each other.

Referring to Figs. 7, 9 and 9-a, I provide an auxiliary member 15 formed of substantially rigid material and overlying the fold 62. The member 15 is hinged or scored along its center line 11, so that when pressure is exerted downwardly against the hinge 11 the two edges of the member 15 tend to spread apart and, being rigid, tend to spread the fold 62. Since member 15 must be substantially rigid in order to function, it must not exceed in length the width of the ultimate cross section of the distended bag. The sides of the bag when it is fully opened, as in Fig. 9-a, move inwardly from the position shown in Fig. '1 as hereinabove described.

It is obvious that the 45 securement illustrated in Figs. '1 and 10 are equally applicable to the bags illustrated in Figs. 1 to 6-a, inclusive, and I have illustrated such securement at 80, 8|, 82 and 83 in Figs. 1 and 2a. Such securement assists in defining the bottom folds and, therefore, to a degree contributes to ready opening of bottom (or top) folds, and where a member such as 15 is utilized such securement may be useful in retaining the member against shifting from the optimum position. The securement is, however, not indispensable for either purpose and the member 15 may be secured to the top or bottom fold, or both, by any suitable means such, for example, as the paste spots 15-a and 1li-b, and, since the member 15 contributes far more materially to the opening characteristics of the top or bottom as herein disclosed, securement within the 45 lines may usually be dispensed with. The use of such a member in the form of Figures 1-4 inclusive is shown at 90 with respect to the top gusset wall I4 and at 92 with respect to the bottom gusset wall I2 in those figures.

In addition to spreading the lower corners 68 and 10 of the gusset folds, the member 11 performs an even more important function in breaking the back of the fold 62. This fold must crumple at each end of the hinge 11 as the side edges of the bag approach the ends of member 15, and the portions of the fold 62 lying between the side edges of the bag and the extremities of the hinge 11 must be drawn downwardly into the plane of the folds 68 and 10. In final position this material occupies the shaded area A in Fig. 9-a.

The member 15 need not, of course, overlie all of the plies in a multi-ply structure and could be placed at any point between the plies. In such a structure it is also possible to utilize several members, each of them relatively lighter than the single member and these members may be placed one after the other between the several plies. It is also possible to place the member 15 on the outside of the bag, that is. tucked up into the bottom. In such case it would, of course, have to be rather securely fastened to the walls of the bottom and would perhaps operate with somewhat less efficiency than on the interior of the bag. Exterior application, however, has a distinct advantage from the manufacturing standpoint and I do not intend to be limited to interior application of such member. The term overlying" as usedin the claims, therefore, is intended to include the member in any of the positions above noted.

In the subioined claims, unless expressly limited, both single-ply and multi-ply structures are included in all claims.

What is claimed is:

1. A multi-ply double side seam bag having an infolded gusset at each end, said side seams being formed by sewing, and a lling opening in one of said ends, said opening being bounded by a wall of the bag and the wall of one gusset fold the extremities of said opening being spaced from said side seams by a distance exceeding the width of said gusset folds.

2. A multi-ply double side seam bag having an infolded gusset at each end, said side seams being formed by sewing, a filling opening in one of said ends, said opening being bounded by a wall of the bag and the Wall of one gusset fold and the margins of said bag wall and said gusset; Wall adjacent said opening projecting beyond the opposite bag wall.

3. A multi-ply double side seam bag having an infolded gusset at each end, said side seams being formed by sewing, a filling opening in one of said ends, said opening being bounded by a wall of the bag and the wall of one gusset fold, the margins of said bag wall and said gusset Wall adjacent said opening projecting beyond the opposite bag wall, and one of said margins projecting farther than the other.

4. A multi-ply side seam bag having an infolded gusset at each end, a lling opening in one of said ends, said side seams being formed by sewing, said filling opening lying between sewed seams extending inwardly from said side seams the extremities of said opening coinciding with the inner ends of the sewed'seams between which the opening lies and being spaced from said side seams by a distance exceeding the Width of said gusset folds.

5. A multi-ply double side seam bag having an infolded gusset at each end, said side seams being formed by sewing, a filling opening in one of said ends, said opening being bounded by a wall of the bag and the Wall of one gusset fold, and lying between sewed seams extending inwardly from said side seams the extremities of said opening coinciding with the inner ends of the sewedseams between which the opening lies and being spaced from said side seams by a distance exceeding the width of said gusset folds.

6. A multi-ply double side seam bag having an infolded gusset at each end, said side seams being formed by sewing, a lling opening in one of said ends, said opening being bounded by a wall of the bag and the wall of one gusset fold and the margins of said bag wall and said gusset wall adjacent said opening projecting beyond the opposite bag wall and lying between'sewed seams extending inwardly from said side seams.

7. A multi-ply double side seam bag having an infolded gusset at each end, said side seams being formed by sewing, a filling opening in one of said ends, said opening being bounded by a wall of the bag and the wall of one gusset fold, the margins of said bag wall and said gusset wall adjacent said opening projecting beyond the opposite bag wall, and one of said margins projecting farther than the other, said lling opening lying between sewed seams extending inwardly from said side seams.

8. A double side seam bag having a gusset fold approximating the width of the expanded bag body.

9. A double side seam bagvhaving a gusset fold at each end, a substantially rigid member overlying each gusset fold, each such member being iiexible along its medial line and said line coinciding with the inner fold of each gusset, said members being positioned on said fold medially with respect to the length thereof and being of a length approximating the width of the expanded bag body.

10. A double side seam bag having a gusset fold at at least one end, a substantially rigid member overlying said fold, said member being flexible along its medial line, said line coinciding with the inner fold of said gusset, said member being positioned on said fold medially with` respect to the length thereof and having a length approximating the width of the expanded bag body, and means preventing shifting of said member relative to said fold.

11. A double side seam bag having a gusset fold at each end, a substantially rigid member overlying each gusset fold, each such member being flexible along its medial line, said linecoincding with the inner fold of each gusset, said members being positioned on said fold medially with respect tothe length thereof and being of a length approximating the width of the expanded bag body, and means at each end of said bag to prevent shlifting of each member relative to its respective fo d.

HOWARD A. ROHDIN.

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