US2188963A - Container - Google Patents

Description

' Feb. 6, 1940./ H. G. sEYBoLD CONTAINER Filed Oct. 19, 1938 INVENTOR /ff/rM/w 6 SD/aow l /L ATTORNE Patented Feb. 6, `1940 CONTAINER Hermann G. Seybold, New York, N. Y., assigner to Bandcan Corporation, a corporation of Del- Application October 19, 1938, Serial No. 235,721

'7 Claims.

This application is a continuation in part of an application previously led by me bearing Serial Number 149,583, flied June 22, 1937, for Containers.

This invention relates to papercontainers for liquids.

. It is an object of this invention to provide a new and improved paper container which will at all times be tight enough to seal therein its contents, particularly when used with liquids, and

which will stand hard usage in handling both before and after being lled and which will remain tight notwithstanding any ordinary abuse it may receive under practice.

It is a further object to provide a container having a paper wall which may be impregnated with any of various compounds suitable for the purpose, depending upon the liquid to be placed in the container and which when so manufacp tured will prevent access of the liquid contents to any portion of the paper wall which might unf favorably affect the liquid contents or the paper of which the wall is comprised.

It is a further object to provide a paper wall container having a metal end adapted to maintain a liquid tight joint, particularly between the metal end and the paper wall, which container will be adapted to hold liquids having gases dissolved therein under pressure Without permitting the gases to be dissipated and which will retain intact such liquid and gases even under severe conditions of commercial handling.

It is a further object to provide a means of at'- taching a metal end to a paper container adapted particularly for holding a liquid, even one containing a dissolved gas under pressure, which will give to the container great strength, because of the metal end and which will hold the metal end rmly in place upon the paper wall to make a liquid and gas tight joint that will not separate even if the filled container be dropped or subjected to rough usage in handling.

It is a further object to provide a paper container in which a. metal end cap or closure member is held'upon the container by a mJetal strip imbedded within the end of the paper side wall in which the metal strip is so iirmly held within the paper of the side wall as to make removal of the strip impossible under all ordinary and expected conditions of use.

This container belongs to the class of paper containers in which the side Walls are formed by winding a plurality of layers of paper upon each other, convolutely. and then attaching to the tube so formed a metal end to strengthen the container and close it.

Many means have been proposed for attaching a metal end to a paper cylindrical Wall to form a container'and some of these devices have 5 been successful for. special purposes within a limited scope where tightness was not required and Where the container was not subjected to severe weather or usage. None of them, however, has produced a container having paper 10 Walls and a metal end cap or caps which is capable of use in the handling of a shipment of liquids or which can be relied upon to maintain a tight joint free from the possible leakage or seepage/between the paper and the metal under 15 `severe lconditions of Weather or use or handling,

or to keep the gases unaffected that may be dissolved in the liquid under pressure as, for example, beer or carbonated beverages.

It has been known to clamp a ring or a rim upon the outside of a paper wall tube relying upon its pressure upon the tube to keep it in place, or else providing it with indentations to bite into the paper. Such constructions have been in common use for certain purposes, for example, in mailing tubes to receive the screw cap, but they cannot be relied upon to makea tight closure, particularly where the paper is impregnated, and they cannot be relied upon to hold the metal end ring or rim in place under rough usage.

It also has been proposed to crimp the periphery of the metal end around the end of the paper wall of the container, clamping the paper wall Within the metal crimp. Such construction for a container may be employed for holding certain light powders, but cannot be used for the handling of liquids. If the ycrimping is lightly done the end cap of the container will come off of the paper, when subjected to use. -If the crimping is done more severely the fibers of the 40 paper are crushed.

It has also been suggested that a metal strip be inserted within the paper side wall so as to project beyond the end of the wall. This strip may beused to hold the metal end cap on by rolling the projecting edge inwardly over the end cap or head. .This construction is inadequate in this event, however, for several reasons, for example, the outer periphery of the paper wall, or that portion of the paper wall which exteriorly surrounds the metal strip, is not protected because it remains exposed. It has also been suggested that the metal strip inserted within the paper side wall be slitted transversely inwardly toward the center line from the exposed side, to f provide a series of side by side tongues throughout the periphery of the strip. The end cap would then be held in place by bending all of the said tongues inwardly over the periphery of the end cap or by bending alternate tongues inwardly and alternate tongues outwardly. In this event a measure of mechanical protection is afforded the exposed outer edge of the paper wall but the exposed and relatively absorbent cut end of the paper is exposed to weather or Water from the outside. Neither of these constructions provide enough mechanical strength for the ends of the container, nor do these constructions provide a liquid-tight seal or a gas-tight seal combined with mechanical strength.

It has also been proposed to make tea chests and other packing cases, boxes, drums, or the like that are comprised of a pulp made of cocoanut fiber, wood, or similar fiber substance and mixed with an insoluble adhesive. The pulp so prepared is spread or introduced in any convenient way between two or more layers of paper, cloth, or the like. The sheeting 'so prepared is formed into a seamless or collapsible body for the chest, box, or case, whichmay be cylindrical, square, or hexagonal. This sheeting comprising the body of the container is reinforced by metal gauze sheeting, expanded metal, or wires embedded 'or otherwise inserted throughout the length of the sheeting. The ends of this reinforcing sheeting project beyond the edges or ends of the box body and are turned over to engage head pieces of sheet metal, or other suitable material, dished so as to fit into the open ends of the body and having projecting edges or flanges which may be turned down with the aforesaid recited exposed metal reinforcement against `the outside of the body and clinched into the same in order to attach the said head pieces in posil tion, but the reinforcing strip has been clinched or crimped around the edges of the end cap upwardly and outwardly from the container body. Such a container obviously would not be suitable for containing liquids, and particularly the seals thus obtained would not be gas-proof. Moreover, a container of the aforesaid described construction would not be adapted for shipment or rough handling.

This invention comprises an article of manufacture possessing the features, properties and the combination of elements which will be exemplified in the article hereinafter described and the .scope of the application of which will be indicated in the claims.

For an understanding of the nature characteristic features and scope of the invention, reference may be had to the following detailed description, taken in connection with the accompanying drawing, in which:

Figures 1, 2, 3 and `4 are cross sectional views through a container embodying this invention v inserted upon each side of the strip, that is to say, at each end of the container wall that is being formed, a narrow metal strip i2, with a greater` part of the width of the strip l2'a, lying` between the layers of the paper strip as it is wound, but having-va small portion i211 extending beyond the paper strip. This extending portion may be substantially V8 of an inch for containers of one quart size and correspondingly larger where desired for larger containers. This metal strip is substantially equalin lengths to the lnean circumference of the finished container so that when the strip is wound within the paper wall. its ends will substantially meet or slightly overlap. l

When the end of the metalstrip has been inserted between the layers of the paper, the winding is continued and preferably under pressure, a suitable adhesive being used. This pressure not only forces the paper of the upper layers firmly against the metal strip but also forces the metal strip firmly against thev paper of the lower layers. This pressure which accumulates. during the winding as successive layers are added causes a firm engagement of the metal strip with the paper both above and below it` and a firm adhesion between them. If a continuous metal ring were employed in place of the metal strip, as has heretofore been proposed, it could not be forced into firm engagement with the layers of paper within it because of its own resistance to reduction in diameter, but this limitation does not obtain where a strip is employed which can be forced into firm engagement with the paper, both on its inner and outer surfaces.

The paper from which the Wallis made may be impregnated before rolling, if desired, or the impregnation may take place at a later stage. The impregnating compound .may be of such a nature vas to assist in maintaining the strip between the paper layers or a special adhesive may be applied to the metal strip or the paper walls to hold the metal in place. 'Ihe successive layers of the paper are fastened together, either by the impregnating compound or by some other suitable adhesive.

The impregnating compound to be chosen ,will

ciflc compounds are not within the scope of my 4 present invention. It is also not within the scope of my invention whether the impregnation be done in the paper, or on the finished end wall, or on the finished or partly finished container, where the construction is such as-to make the latter possible. y

Moreover, where the end wall is rst impregnated, additional impregnating compound may be added at the point of contact of the endvwall and the side wall, so as to thoroughly seal the v joint between them, if for some special purpose this is deemed desirable. I

Where it is intended to use a container yfor an article such as beer which is to be pasteurized, the impregnating compound will be sochosen that it will maintain yits properties during the pasteurization process without effect. on thetaste of the beverage.

The metal end wall will in itself be'ofa ma,.-

terial or will be surfaced with a material which will be inert to thecontents of the' can; "for 'many purposes tin plate may be used or where the container is to be used for beer the surfacef'rwlll preferably be of aluminum.

Under certain conditions it maybe vdesirable to provide a metallic layer on the paper exposed on the interiorA of the container. Suitable layers may be provided by metallic foil, such as tin' or aluminum foil, which may be adhesively secured to the inner paper walls if desired. The foil lining may tend to enhance the liquid and pressure-retainingproperties of the container.

In Figure 1 there is shown a section of the end wall thus formed. The metal strip is in fact preferably much thinner than shown in this figure. After the paper side wall is completed as shown in Figure 1, the projecting edge I2b of the metal strip is spun over or bent over or iianged over f as shown at I3 in Figure 2 to lie in a horizontal plane. With the side walls so formed there is then inserted within the paper wall a metal cap I4 having a depressed central portion forming a cylindrical wall I5 fitting closely'within the container wall and having also an over-hanging flange I6 of greater diameter than the spun portion or flange I3 of the strip I2.

'I'he next step in the manufacture consists in spinning or crimping the end I6 downwardly around the projecting rim I3 of the metal strip. As shown in Figure 3 this projecting edge I6 is crimped clear around the edge of the flange I3 extending inwardly back upon the underside as shown at Il.

Thereafter the compound flange I3, I6 and I1 is crimped downwardly parallel to the side wall of the container pressing inwardly against the outside of the side wall to bind it firmly to the cylindrical wall I5 of the depressed portion of the end wall. The degree to which the projecting edge I6 is bent upon the ange I3 of the metal strip may be varied to suit conditions.

In Figures 5 and 6 is shown a modification in which this inwardly bent portion I'I is much less in diametrical width than that shown in Figure 3, so that in the finished container in this embodiyment the ultimate periphery of the projecting edge does not extend upwardly between the flange I3 and the side wall of the can, but merely engages the end of the flange I3 so as to be held against removal thereby. This form of the invention has advantages in manufacture over that previously described.

While the flanging of edge I6 around the ange I3 is described as a separate step for clarity of illustration, the device will in practice be made by automatic machinery Where no sharp demarkation of steps is required. i

From the foregoing it will be observed that by reason of the fact that the projecting edge of the end wall overlies and is crimped down and inwardly around the edge of the flanged overstrip, the end of the side paper wall is forced inwardly against the cylindrical wall of the recessed portion of the end of the container by the crimping action, thus making a tight joint at that point. During the subsequent further rolling of the crimp downwardly and inwardly to engage the outer edge of the end of the side wall, as shown in Figure 4, the projecting edge of the end wall moves on a larger radius than the corresponding portion of the inserted strip, making a, tight joint between them. As the bead thus formed is pressed against the outside of the end of the side wall of the container, this act presses the side wall firmly against the inside shoulder of the end wall, and thus not only crimps the end of the side wall firmly between them, but also places the metal of the inserted strip in actual compression to hold the end wall in place. The rigidity of the construction thus formed is emphasized by the rigidity of the bead which is in circular form around the container, and thus the entire connection between the side wall and the yend wall becomes a. substantially rigid unit.

If the crimp had been rolled downwardly and outwardly the projecting edge of the end wall would move on the smaller radius and the end would be forced upwardly away from the end of the side wall by the crimping action.

As clearly shown in each 'of the figures, means are provided for increasing the adhesion between the strip I2 and the superposed layers of paper between which it lies. As shown in Figure l this means comprises a set of serrations 20 tending to bite into the paper wall. In the form of. the invention shown in Figures 7 and 8, this means is provided by punching from the metal strip a plurality of openings 2l of sufficient size to permit the glue or cement or to be forced therethrough to lockvthe strip in place or the side wall may be rolled with4 suincient pressure to bring the adjoining layersof the paper strip in actual glued contact with each other through each of the openings 2|. As will be clearly seen from Figure 7 the perforations 2l may with advantage be punched from the sheet along the edge thereof as shown at 22 and this punching may in itself leave a serrated edge to assist the locking effect.

The means here provided for attaching an end to a paper container may be applied to one end of a container having a different attaching means at the other end but it is at its fullest advantage when used on both ends to form a complete paper container, as shown in Figure 4, and thus has a special advantage that it forms a paper can which will withstand more punishment than the ordinary metal can, is cheaper, is cased and may be filled, handled and opened with standard equipment now employed in the use of metal cans.

Since certain changes may be made in the above construction and different embodiments of the invention could be made without departing from the scope thereof. it is intended that all matter contained in the above description or shown in the accompanying drawing 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 therebetwen.

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

, 1. A paper container comprising a cylindrical cardboard wall, a metallic strip circumferentially imbedded Within said container Wall and having a portion thereof projecting beyond the end of said wall, said strip being iianged outwardly and an end cap having a central cylindrical shoulder fitting closely within said container wall and a flange portion extending over the flange portion of said strip and crimped downwardly over the said strip and inwardly against the cylindrical cardboard wall to hold said end portion in place.

` fitting closely within said container wall and a flange portion extending over the flange portion of said strip and crimped downwardly and inwardly around the edge of the same, said flanged portions being crimped downwardly and inwardly against the outside of said container wall to form a bead, whereby the end of said container wall is tightly clamped between the cylindrical shoulder of said end cap and said bead and held in rm engagement with said strip.

3. A paper container comprising a side wall formed by rolling a sheet of paper convolutely and having an end strip inserted between the superposed layers at one end for substantially a complete revolution, said strip extending outwardly beyond the end of said container wa11;

said strip being flanged outwardly and an end cap having a cylindrical shoulder portion tting closely within said container wall and a flange portion extending over the iiange portion of said strip and crimped downwardly over the said within said container wall and a flange portion extending over the flange portion of said strip and crimped downwardly and inwardly around the edge of the same, said flange portions being crimped downwardly and inwardly tightly against the outside of said container wall to form a bead, whereby the end of said container wall is tightly clamped between the cylindrical shoulder of said end cap and said bead and held in rm engagement with said strip.

5. A liquid-tight and pressure-proof paper container comprising a side wall formed by rolling a sheet of paper convolutely and having a metal end strip' inserted between the superimposed layers adjacent at least one end of the paper wall thus formed for substantially a complete revolution, said paper being waterproofed and said strip extendingI outwardly beyond the end of said container wall and being flanged outwardly, and a metal end cap having acylindrical shoulder portion tting closely within said coners at one end for substantially a complete revolution, said paper being waterproofed andl said strip extending outwardly beyond the end of said container wall, the latter being flanged. outwardly, and an end cap having a cylindrical shoulder portion fitting closely within said container wall and a flange portion extending over the flange portion of said strip and crimped.

around the same to hold said end portion in place, said ange portions being crimped downwardly on the outside of said container Wall to form a bead, whereby the end of said container wall is tightly clamped between the cylindrical shoulder of said end cap and said bead and held in rm engagement with said strip, resulting in a liquid-tight seal.

'7. A liquid-proof and pressure-tight container l comprising impervious, convolutely wound paper side walls, a metal end cap, and a sheet metal strip inserted between the layers of paper of said side walls, said strip extending substantially completely around the peripheral edge of said side walls and extending beyond and flanged outwardly from said side wal1s,said end vcap belng substantially dish-shaped with substantially vertically extending sides and a ange extending outwardly therefrom, said end cap beingadapted to be inserted into an end of said container whereby the vertically extending sides are in engagement with the paper side walls of the container and the outwardly flanged portion of the resilient strip contacts said flange ofnsaid end cap, said ange and flange portion extending over the outside edge of said container and crimped thereover to provide a pressure-tight and liquid-tight seal.

HERMANN G. SEYBOLD.

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