US1648370A - Reenforced paper bag - Google Patents

Description

Nov. 1927.

J. W. TAGGART REENFORCED PAPER BAG Filed March 18. 1925 Patented Nov. 1927.

UNITED STATES PATENT OFFICE.

JOSEPH W. TAGGART, OF WATER/DOWN, NEW YORK, ASSIGNOB; 'IO TAGGART BROTHERS COMPANY INC., WATERTOWN, NEW YORK, A CORPORATION OF NEW YORK.

REENFORCED PAPER BAG.

Application filed March 18, 1925. Serial No. 16,466.

This invention relates to improvements in aper bags generally, and the invention reates particularly to the heavy strong bags used for bagging cement, gypsum, ground limestone, plaster, flour and other pulverized products.

The primary object of the invention is to provide means for reenforcing the top and bottom ends of bags, for preventing bursting, as well as leakage, during the'handling, transportation and storage of the filled bags. A further object is to provide powerful and elfective sealing means, which preferably comprise similar metal strips that are applied to the opposite ends of the tube, from which the bags are made, said metal strips being folded, together with the ends of the tube, in a manner-to lap or roll and clinch the said ends. A further object is to reenforce and stiffen the metal strips, by the initial folding of the opposite lateral edges of the metal inwardly, hemslike, upon the body,- before the strips are applied to the tubes, the said hems preferably being applied, in a manner.to be concealed, and also to effect the stiffening and reenforcing of the lateral margins of the strips, when the latter are given the final folding, for preventing said margins from gaping or springing away from the tubes, during the usual handling or stacking of the filled bags. vAnd a further object is to provide supplementary means, for permanently securing the metal reenforcing strips to bags that are employed for packing and shipping heavy materials, that subject the bags to extraordinary strains.

The various features and parts of the invention will be understood from the detailed description which follows, and by reference to the accompanying drawing, in which- Figure 1 is a plan view of a paper tube, from which the bags are made. Fig. 2 is an edge view of the same. Fig. 3 is a plan view of a valve-bag, to which my metal reenforcing strips are applied. Fig. 4 is an enlarged broken side elevation ofv the bag, shown in Fig. 3. Fig. 5 is an enlarged broken edge view of the same, showing the metal reenforcing strips folded and clinched. Fig. 6 is respectively a folded and an extended edge view. of one of the reenforcing strips. Fig. 7 is a broken side view of a bag showing the metal reenforcing strip riveted. And Fig. 8 is an end view of the tubular body of the bag; showing the usual lateral tucks.

In the drawing, 2 represents a prepared tubular blank, such as is commonly employed for making paper bags. The tube in Fig. 2, is shown to be single ply, but it it will be understood that tubes of several ply, are included in the scope of the present invention. The tube 2 is normally open at its exposed ends '2-2, and it is shown formed with opposite lateral tucks 2', by means of which the tube may be expanded when filled, in a well-known manner. The complete bag, shown in Figs. 3 and 4, is

provided with a well-known filling valve, as

3. According to the showing in Figs. 3 and 4, the top and bottom ends of the tube 2 are closed and sealed, for reenforcing the bag, and the valve 3 comprises the only opening whereby the bag may be filled. I lay no claim to the valve in the present case, and do not wish my invention to be limited to so-called valve-bags.

My invention comprises broadly, novel and powerful end closing, sealing and reenforcing means, for all classes of paper bags, and said means may be applied to either, or both ends of any bag that is made from tubes having normally open top and bottom ends. My reenforcing means comprises a flexible foldable strip of tin, or other suitable pliable sheet metal, as 4, of suitable gage for withstanding the strains incident to the handling and use of bags, to which the strips may be applied. The strips 4 are usually cut to suitable length and breadth, owing to the size and capacity of the bags, and in the case of valve-bags (see Figs. 3 and 4), the strips are applied to the opposite ends of the bag 2, by the makers of the bag. In cases where the valves 3 are not used, but one strip 4 is usually applied to the bottom end of the tube, and the top end may therefore be tied, sewed or otherwise closed and sealed, or the filling end of the bag may be closed and sealed by the user, after the bag is filled, by means of my metal, reenforcing strips 4, as shown in Fig. 5.

In preparin the reenforcing strips 4, the opposite latera margins or edges are usually first folded inwardly hemlike upon the body of the strip, as shown at 4', in the lower view in Fig. 6. This work is usually done by the maker of the strips. To apply the reenforci'ng strips 4 to the ends of the tube 2, the

end portion, as 2, of the tube may first be folded inwardly upon one side of the tube (see for'example top portion of Fig. 5). One hem orfolded margin 4' of the strip 4, may then be inserted between the end 2' and the side of the tube, after which .the body of the strip may be folded upwardly, thence across the bend, as 2, and then downwardly upon the opposite side of the tube. The final operation may consist of applying pressure to the opposite sides of the folded parts for compressing and for more elfectually clinching said parts. When applying the strip 4 to the tubes, as described, the hems 4' preferably face inwardly, so as to prevent the relatively sharp and ragged edges of the hems from chewing or cutting the web of the tube or injuring the operators, during the folding operation, as well as during the subsequent handling of the bags. By this disposition and arrangement of the hems the round margins 4 of the strips, which are provided by the forming of the hems 4', facilitate the neat and compact folding of the parts, and the round margins 4", which are left exposed at the end of the folding operation, provide smooth 1 abutments for supporting and protecting the bulging web 2, when the bag is filled, as shown by dotted lines in Fig. 5. The same protection and support is also afforded by the relatively prominent fold, as 4, at the opposite side of the bag.

' According to Fig.5, it will be understood that, the reenforcing strip 4 is equally applicable to either plain bagsor valve bags, and thatthe saidstri may be applied either before or after the ag is filled. In order to prevent injury to" other bags or to persons handling the empty or filled bags, the ends of the reenforcing strips may be formed round, as shown in Figs. 4 and 6. When the material to be bagged is relatively heavy like cement and limestone, as well as, when the material is extremely finely powdered, and liable to escape through thefolds of the ends of the bag, the strips 4 after being folded, as shown in Fig. 5, may be perforated and riveted, as shown in Fig. 6. Q

My reenforcing strips are extremely simple, and may be made out of relatively light sheet metal and still effect a close and powerful seal of the ends of a bag without danger of cutting the paper. By the use of the strips 4, as herein shown and described, bags that formerly were closed by sewing, tying, and by other sealing means, may be packed with a greater amount of material, and be filled to a greater extent, without danger of the. ends giving away, and bags having my reenforcing strips applied to the opposite ends are able to withstand rougher handling,

and the said reenforcing means facilitate the stacking of the bags to greaterheight, when stored, or when being transported, thanby the use of any other fastening and sealing means known to me.

Having thus described my invention, what I claim, is-- V V 1. A bag having a body portion of flexible material such as paper and sealing means along the marginal part thereof including a flexible metallic strip inter-folded with complemental portions. of the body of the bag to provide at least one return fold in the body material enclosed between parallel portions of the metallic strip, the innermost portion of the metallic strip having an inwardly turned edge to present a rounded surface at the adjacent bend of the body material and a projecting edge adapted to im i sent a rounded surface to the adjacent body material and a second projecting edge for impingement against the body material when the strip is compressed thereonto.

I 2. A bag having a body portion of flexible material such as paper and sealing means along the marginal part thereof including a flexible metallic strip inter-folded with complemental portions of the body of the bag to provide at least one return fold in the body material enclosed between parallel portions of the metallic strip, the outermost or free edge portion of the metallic strip having an inwardly turned portion to present a rounded edge surface to the adjacent body portion of the bag, and an inner projecting edge for impingement against the body portion of the bag when the strip is compressed thereonto, said inwardly turned portion of the strip being of a len h to extend a substantial distance inwar ly of said rounded edge surface and providin a substantial reenforce for said outermost ee end portion of the strip.

JOSEPH W. TAGGART.

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