US3262628A - Shipping container - Google Patents

Description

July 26, 1966 J. s. HEISLER ETAL 3,262,628

SHIPPING CONTAINER lr-ici. l.

Filed Jan. 9, 1965 2 Sheets-Sheet 1 JEROME .S bfi/5l EK July 26, 1966 J. s. HElsLER ET AL SHIPPING CONTAINER 2 Sheets-Sheet 2 Filed Jan. 9. 1963 lililflllllllld United States Patent O 3,262,628 SHIPPING CONTAINER Jerome S. Heisler, Eric Glenn, and Anthony J. Starr, Wilmington, Del., assignors to Container Corporation of America, Chicago, Ill., a corporation of Delaware Filed Jan. 9, 1963, Ser. No. 250,360 5 Claims. (Cl. 229-14) This invention relates to a new and improved container for liquids and other materials and especially for hazardous liquids and materials such `as chemicals of various kinds which yare corrosive or easily contaminated if brought into contact with metal surfaces. The invention is concerned more particularly with an improved cornposite drum that can be provided in any suitable shape such as cylindrical, cubical, etc., and which is especially useful for the shipping of various kinds of acids, corrosive chemicals, food products, and the like, in bulk in interstate commerce.

Containers -of the indicated' type not only have to be made to protect the products carried thereby against contamination and corrosion, but they must also be highly resistant to destruction. In fact if they vare not able to withstand the very severe tests required by the Federal Interstate Commerce Commission they are banned from interstate traic. The severity of these tests will be appreciated when it is noted that among other tests, the drum must successfully withstand without leakage or serious rupture, four foot drop tests on the top and bottom' edges, diagonally onto solid concrete, on the sidewall over a 2" X 6 timber resting on solid concrete, and on the closure or other vulnerable parts thereof onto solid concrete, and compression tests of over 1200 pounds without buckling or a maximum deiiation of over one inch.

In view of their contents and the severity of the requirements they must meet in order to be used in interstate commerce, drums of the indicated type have been usually made of plywood or steel with a lining of material that is unaffected by the products carried thereby. The art, however, has been continuously investigating the possibility of constructing drums made of lighter and less expensive materials. The obvious materials that might be capable of satisfying these two requirements are paper and paper fibers, but there are certain inherent ditliculties in the way of adapting such materials for the indicated purpose. The paper and paper bers are not resistant to liquids and especially acids, which additionally can consume paper materials rapidly. Attempts have been made to overcome this shortcoming of paper by providing it with linings or barriers of wax, plastic and metal foil. Such efforts however, have not been entirely successful, either because the protective material in the form it had to be used is not wholly impervious, or is not mechanically strong enough to form a strong drum, `or cannot be used to provide a strong, leakproof drum capable of satisfactorily meeting and passing the aforesaid I.C.C. tests', or even surviving the conditions to which it would be subjected in use.

The art tried to overcome these diiiculties by combining with a fiber drum an inner lining of polyethylene. The usual forms of fiber drums were found to be too weak to withstand the tests required by the Interstate Cornmerce Commission. When it was attempted to use separate thin walled polyethylene bags, the problem :of porosity of the lining became troublesome because of the thinness of the material and the diiculty of forming a nonporous, thin extruded polyethylene casing. Further, fatigue failures showed up in the heat seals and as the drum was emptied the distortions caused in such a bag by its collapsing aggravated the shortcomings of such heat seals. Open end molded containers of polyethylene were also tried with no better results because of stress failure `and porosity of the material in its formed condition. To

Pice

close such a container necessitated a separate heat seal whose application degraded the treated polyethylene and consequently nally resulted in failure of such degraded material.

It is the primary purpose of the present invention to provide an improved composite container or drum constituted of paper fiber material and plastic material, and constructed so as to be completely porosity free and stress free and capable of being accepted by the Interstate Commerce Commission as a satisfactory liquid container for.

interstate shipments.

In accordance with the invention, there is provided a paper ber drum of novel construction having within the paper fiber body thereof, a seamless, molded, one piece collapsible plastic container which provides complete protection for such body against the product contained there- The features and advantages of a drum embodying the invention will become more clear after a perusal of the following description when read in connection with the accompanying drawings, in which FIG. l is a vertical sectional, broken View of a drum embodying the features of the invention;

FIG. 2 is a vertical sectional View showing another embodiment of the invention;

FIG. 3 is a partial, sectional View of a detail illustrating another method of locking the outlet ange of the lplastic container to the drum; and

FIGS. 4 and 5 are views similar to FIG. 3 showing still further methods of locking the outlet flange in position.

The drums illustrated in the drawings each have a minimum capacity of five gallons and may be made smaller or in substantially larger sizes, such as, 30, 55, etc., gallon sizes. The drum of FIG. 1 is composed of a cylindricallyshaped body 10 constituted of kraft paper wound into a multiplicity of plies in the form of a tube and adhered together with a suitable plastic glue in accordance with known practice. It has been found, that for the purposes of the invention, the body 10 should be made with a minimum of four plies of the kraft paper. Recessed within the ends of the body 10 are the top and bottom walls of the drum which are constituted of elements pressure inserted into such ends. As illustrated, the top wall is composed of a pan-shaped Imember made of heavy kraft paper and having a disc body 11 of an area substantially equal to the interior cross-sectional area of the body 10 and to the periphery of which is integrally connected an outwardly extending ange 12 of substantial width in frictional engagement with the top end portion of the inner wall of body 10. Seated on the outer surface of the disc body 11 of the pan-shaped member is a closure disc 13 of substantial thickness and of an area substantially equal to that of such disc body so that the peripheral edge of such disc 13 snugly engages the inner root portion of the flange 12. The closure disc 13 is locked in position in the pan-shaped member by a reinforcing ring or annular member 14, the exterior surface of which is in frictional engagement with the remainder of the flange 12 outwardly of such disc 13. In a similar fashion the bottom wall of the dru-m is composed of a pan-shaped member, closure,

disc 13 and reinforcing ring or `annular member 14'; the disc body 11' and ange 12 of such pan-shaped member being assembled with disc 13 and ring 14 in a manner similar to that described with respect to similar parts in the top wall. f

The top and bottom closure discs 13, 13', respectively, are each made of a plurality of plies of kraft paper bonded together with a suitable plastic cement known to the art. The thickness of such top and bottom closure discs will depend on and will vary with the capacity and performance requirements of the drum. Thus, a thickness of 0.1

-inch is adequate for a 5gal1on drum, while a thickness of 0.2 inch is more suitable for -a 15-gallon drum. The top and bottom closure discs may be secured in position within the pan-shaped members by adhering the outer edges thereof to the inner walls of such pan members by lines 15 of a suitable plastic glue capable of permanently bonding such surfaces together, and annular lines 16 of a similar glue may be utilized to bond the outer edge portions ofthe outer surfaces of such closure discs to the reenforcing rings 14, 14 which are also constituted of a plurality of bonded plies of kraft paper. Y The thicknesses of the rings 14, 14 are preferably greater than the thicknesses of their associated closure discs 13, 13' and may have a substantially greater height than such thickness. rl`he rings 14, 14 may be additionally adhered to the flanges 12, 12' of the pan-shaped membersby lines of glue 17 and such fianges may be secured to the drum body 10 by lines of glue 18. Whether or not the elements constituting the top and bottom walls are so adhered to each other and to the drum body 10 by the aforesaid lines of glue, all `of such elements in addition to being pressure fitted within the ends of such drum body are permanently secured together in their assembled relation on such body by a plurality of staples 19 driven through each set of associated body end portion, flange and reenforcing ring as close as possible to the closure disc associated therewith. The staples 19 are Vpreferably of the type known as crown staples in that they are arcuately-shaped in crosssection and provide a convexly-shaped exterior surface. The staples 19 extend around the entire exteriors of the body end portions and are preferably substantial in number, being in such number, for example as to be spaced apart a distance approximating two to three times the length of such staples.

It will be understood from the foregoing that at each end of the body, such body end and its associated wall assembly are permanently joined together into a unitary construction from which the parts cannot be separated without the destruction of such parts. The plies in the rings 14, 14' and the plies in the body 10 extend about the same -central axis of the body and therefore complement and rigidify each other; which rigidity is further enhanced by the plies in the two closure discs 13, 13 which extend at right angles to such axis. The crown type of staples used in the rings 14, 14', flanges 12, 12 and body 10 further increase the rigidity and strength of the body 10 at its ends and render less likely any possible failure of the same.

Positioned adjacent to the inner surface of the body disc 11 of the bottom pan-shaped member, are a pair of peripherally spaced vent holes 32 which bring the wholly closed chamber defined by the above described paper drum casing into communication with the atmosphere to enable the drainage out of such paper casing of any liquid that may have inadvertently collected therein, and to facilitate the collapsing of the plastic container enclosed by such casing as such container is emptied of the product packed therein. It has been found that two -vent holes of about 9/16 inch diameter `will accomplish the desired results.

Located within the `drum chamber formed by the above described body 10 and top and bottom wall assemblies, or end walls, is a seamless, molded, one piece container 20 made of a plastic material suitable to the qualities of the product to be shipped in the drum. For example, it is preferred that the container 20 be made of a suitable polyolefin, such as polyethylene, if the contemplated product of the drum is to be a corrosive acid or a liquid that may be readily contaminated by contact with metal, or impossible to store adequately in paper fiber. The exterior configuration and the dimensions of the plastic container should be substantially the same as the configuration and dimensions of the drum chamber so as to provide `a fai-rly snug fit preventing substantial movement of the container relative to the overpack during handling and shipment of the drum. The fit should not be so close, however, as to eliminate the presence of an air layer between the container 20 and the overpack defined by the body 10 and the ends walls; such air layer being sufiicient tocushion the movements -of the filled container relative to the overpack. This cushioning action is enhanced lby the fact that at the top and bottom ends of the container, and especially the bottom end thereof which usually is subjected to shock impact to a greater extent in normal handling, the plastic container 20 is provided with end walls which are integrally joined to the body portion thereof by rounded portions which curve in cross-section through a angle so that such rounded portions span the right angled junctures of the casing body and top and bottom -walls (note the sectioned portion of FIG. l of the drawings). There is thus provided at the top and bottom ends of the container, an outer casing or overpack construction in which vertical and horizontal members intersect at right angles, and in which lining portions span such 90 angular intersections in a rounded fashion. It has been found that such construction provides ideal contours for the overpack and liner in the critical top and bottom edges or corners of the container. The right angularly disposed overpack parts provide great strength at such container corners, and the rounded liner corners enable the liner to maintain its integrity as a container even when the overpack is ruptured by shock impact because the liner by reason of its configuration at such corners may readily deflect and adjust itself to the shock of such impacts. The walls of the container 20 are not 4thick enough so that the container per se can -be utilized as a means for shipping products in interstate commerce, and are preferably of such thickness that the container will collapse as the product is being withdrawn therefrom. It has been found that a suitable preferred thickness for the walls of the plastic container to accomplish the purposes of the invention is about 0.010 inch.

The container 20 is provi-ded in its top wall with at least one integral outlet 22 which is preferably offset with respect to the central axis of the container and which extends up through an associated opening 25 formed by aligned holes in the disc body 11 and closure disc 13 of the top wall ofthe fiber overpack. The outlet 22 has a lower portion 23 which extends up vertically from the top container wall 21 and through said opening 25 and is provided with suitable means for retaining it in proper position with relation to the top wall of the overpack. One suitable means for accomplishing this purpose may be provided, as is shown in FIG. 1 of the drawings, by integrally molding on the upper periphery of flange wall portion 23 and at a level adjacent to the outer surface of the fiber closure disc member 13, two or more projecting lugs 24 constructed thereon so that the circular edge portion of the opening 25 is snugly locked -between such top container wall 21 and the lugs 24. The lugs 24 are formed on the outlet 22 so that their outer ends just overlie the edge of opening 25 an amount sufficient to provide an effective lock with such edge, but not to such extent that they cannot be drawn by force through the opening 25. The lugs 24 have substantial thickness providing them with sufficient rigidity to maintain such lock in the use of the drum, but retain a sufficient degree of compressiveness or flexibility to enable them to be forced through the opening 25 in the assembly of the drum. The outlet itself and the fibers of -the paper material of the closure disc 13 around the opening 25 deflect to some degree to facilitate such passage of the lugs therethrough. The number of such lugs 24 are optional an-d may be more than two, for example, four or more, and may even be continuously about the outlet 22 in the form of a ange or ring. Further the ring may be separate from the outlet and seated in a recess or locked in position on the outlet by suitable projections or heads, as is illustrated by the ring 24 and lbeads 26 in the outlet 22 shown in FIG. 3 of the drawings, and the snap ring 24 and annular recess 27 in the outlet 22" shown in FIG. 4 of the drawings.

In the constructions of FIGS. l, 3 and 4, the lugs 24, beads 26 and recess 27, respectively, are located below a screw thread 31 provided on the outlet for receiving any suitable cap or plug closure, such as the cap 30 of known construction. It is also within the contemplation of the invention to extend such screw thread down to the top wall 21 of the container 20 and to additionally screw on such thread suitable means for retaining the outlet in proper position relative to the top wall 13 of the overpack. Such extended screw thread may be of uniform configuration throughout its length, or. may be provided, as is shown in FIG. 5 of the drawings, at its lower end with a portion 31 of greater diameter to enable the retaining means to be readily'slipped over the upper end of such screw thread and consequently to enable such means to be more quickly adjusted to proper position. The retaining means may be constituted of any suitable internally threaded member and may be constituted as shown in FIG. 5, of an annular plate or ring 28, the inner edge portion of which is split and formed on one side of such split to provide a downwardly inclined leading edge 28 depressed from the plane of the ring approximately the thickness of one thread of the portion 31' and a progressively lesser inclination extending from such leading edge 28 throughout a major portion of the circumference of such inner edge portion. Thus the inner edge of the ring 28 is enabled to threadedly engage one thread of the portion 31' and to be screwed down on such portion until the ring is properly adjusted with relation to Wall 13. The ring 28 may be made of any suitable material such as metal and plastic and preferably is quite thin so that it will not interfere with the proper seating of the cap 30 on the outlet.

It will be understood from the foregoing that in the preferred sequence of assembly of the several parts of the drum, the closure disc member 13 and itsassociated pan-shaped member and reenforcing ring 14 are initially secured in position within the upper end of the body 10. The container 20 is then inserted through the open bottom end of the body with the outlet 22 thereof located in registration with the opening 25. With the aid of a suitable tool permitting a substantial drawing force to be applied to the outlet 22, the latter is forced out through the opening 25 until the lugs 24 come into locking position over the edge of such opening. The bottom closure disc member 13' and its associated pan-shaped member and reenforcing ring 14 are then assembled onto the bottom end of body 10.

Instead of closing thetop end of the drum with a closure disc 13 and the associated pan-shaped member and reenforcing ring 14, such end may be closed by a metal top 35, in FIG. 2, that may be provided with an off-center outlet flange 36 with the upper beaded edge of which the lugs 24 engage in locking relation. The metal top 35 may be made of mild sheet steel of 26-28 gauge and is formed on its outer periphery with a U-shaped channel portion 37 adapted to snugly receive the upper end of the cylindrical body wall 38. The other edge of the channel portion 37 extends downwardly a substantial distance to form an external flange 39 enclosing the top end portion of body 38. The channel portion 37 and flange 39 may permanently be bonded or connected to the paper material of body 38 in any suitable manner as by the employment of a suitable known plastic glue 34, or by crimping channel portion 37 thereto. It will be understood, that the bottom closure disc 13 and its associated panshaped member and reenforcing ring 14 in the construction of- FIG. l may also be replaced with a similar metal closure alike in all respects to the metal top 35 except that it does not include an outlet opening such as is formed by the flange 35, but is continuous throughout its area.

In the drum of FIG. 2, the body is composed of two telescoped annular or tubular body walls 38 and 40 which are force fitted together into a tight frictional lit, and the overlapping portions of which may or may not be bonded together with a suitable plastic material. It is preferred that body wall 38 be made from a 3-ply kraft paper tube and that body wall 40 be made from a 5-ply kraft paper tube so that where the two walls overlap there are eight plies of paper. The upper end of the outer wall 40 is located below the top of the inner wall 38 by a distance at least equal to the width of the llange 39 and positioned adjacent to a rolled bead 41 formed on the lower edge of such flange, thus providing a very strong, sealed joint at the top of the drum. The lower end of the outer wall 40 is turned in to form an internal annular flange 42 on which is seated and to which is adhesively bonded and stapled by the staples 33, the bottom closure disc 43 of the drum. The bottom wall 43 is locked against any inward movement relative to the body walls 33 and 40 by the `bottom end of the inner body wall 38 which terminates short of the flange 42 a distance approximating the thickness of the bottom disc 43 and engages the upper Y surface of the outer peripheral portion of such bottom disc 43. The joint formed by the body wall 38, bottom closure disc 43 and flanged end A42 of the body wall 40, is strengthened and rendered a completely sealed joint by a bottom layer of multi-ply kraft paper 44 adhered throughout its entire area by a suitable plastic material to the bottom closure disc 43 and flanged bottom end of the body wall 40. It will be noted that the bottom covering disc 44 conceals the staples 33 and the joint formed by the flange 42 with the closure disc 43. The staples 33 are also concealed on the interior of the ilber overpack by a layer 45 of kraft paper adhered to the interior surface of the closure disc 43. As in the construction of i FIG. l Vent holes 32 may be provided through the body walls 35, 40 adjacently above the inner paper layer 45. It will be understood that instead of providing an intumed flange 42 on the otuer wall 40 and the staples 33, inner layer 45, and bottom covering disc 44, the bottom of body wall 40 can be made straight as is the body wall 10, and an associated pan-shaped member, reinforcing ring and crown staples used to secure the bottom closure disc 43 in position in the manner of FIG. 1, in which case the two telescoping body walls 38 and 40 can be replaced by a single body wall 10, or in position against the lower end of the inner wall 38 if the telescoping walls are retained. The telescoping wall construction provides an additional advantage in that it is readily adapted to the provision of one or more handles for the drum. Thus as shown in FIG. 2 ahandle 56 of suitable shape may be pivotally mounted on a bearing member 57 which extends through a slot in the outer body wall 40 and has inner members anchored between the two walls 38 and 40.

' The Seamless, molded plastic container 46 within the drum of FIG. 2 is constructed substantially similar to and assembled within the drum in a manner essentially the same as the plastic container 20 of FIG. 1. The outlet 47 of container 46 however, may differ from the outlet 22 of container 20 by making its lower portion substantially channel-shaped to snugly line the interior of the metal outlet flange 36 and seat on the upper beaded edge of such flange 36. The outer portion 49 of the outlet 47 may be reduced in thickness and extended over the external annular shoulder 48 formed on the flange 36 and into the annular recess formed below such shoulder. As so constructed, the outlet 47 may be locked in position on the flange 36 by a plastic closure 50 which is inserted into the channel-shaped lower portion within the flange and has integrally formed thereon a plastic (polyethylene) channel-shaped portion 51 which encloses the exterior of the flange 36. Connected by its upper beaded edge to the closure above the channel portion 51, is a metal clamping ring 52 which overlies and conforms in shape to such channel portion, and which is crimped along its lower edge to lock the lower edges of the channel portion 51 and the outer portion 49 of the outlet 47 inthe recess formed by the shoulder 48 of the flange 36. The opening in the closure 50* may be closed by a frangible wall 53.

The invention also contemplates employing other types of closures known to the art for closing the openings in the anges of the plastic containers and in order that such other closures may be efficiently utilized, the outlet ange may be given any suitable conformation.

While there has been here-inabove described and illustrated in the accompanying drawings, preferred em- -bodiments of the invention, it will be apparent to those skilled in the art that various changes may be made in such embodiments without departing from the spirit of the invention or the scope of the appended claims.

What is claimed is:

1. A shipping container that is highly resistive to rupture when subjected to severe drop tests and rough handling, and yet is constituted of light,krelatively inexpensive materials, said container comprising an outer casing, and an inner container separate from said casing except at the outlet for the liquid contained therein, the body of said outer casing being composed of a plurality of convolutely wound layers of kraft paper bonded together to form a rigid multi-ply, annular tube, a rigid disc-shaped .top wall and a rigid disc-shaped 'bottom wall closing the ends of said casing body, said bottom wall at least having its peripheral edge portion disposed at right angles to the annular wall of said casing body to form a right angled juncture therebetween, an annular member permanently secured to each end of said casing body and permanently connecting the periphery of an associated end wall to said casing body, said top wall being provided with at least one outlet opening, said inner container consisting of a seamless, molded, single piece of plastic material formed to provide an annular body portion, and top and bottom walls integrally joined to the ends of said body portion by top and bottom rounded end portions, of which the bottom one at least is curved in cross-'section through 90, and the plastic material of said container being of a thickness such that the inner container cannot perse be used to transport liquid in ,Y interstate commerce, the body of said closed inner container conforming in shape to the interior of said casing with the bottom rounded end portion at least of said inner container spanning the right angled juncture of said casing bottom Wall and body, and providing a cushion against shock impact on the bottom edge of said outer casing of sucient eiectiveness to protect the product holding ability of said inner container even when such bottom edge of the outer casing is ruptured by such shock impact, and said inner container having at least one outlet integral therewith and extending up through .the outlet opening in said top Wall, and means on said outlet for locking the latter to the rigid material forming the edge of the outlet opening.

2. A shipping container such as dened in claim 1 in which said outer casing is provided with a vent opening permitting the ingress of atmospheric air into the space between the inner surfaces of said casing and the exterior surfaces of said inner container.

3. A shipping container such as dened in claim 1, in which said locking means on said inner container outlet is composed of outwardly projecting locking means fixed to said outlet intermediate the length of the latter and engaging the top of said outlet opening edge to lock said outlet against inward movement through said opening.

4. A shipping container such as deined in claim 3, in which said locking means are constituted of a plurality of locking lugs of substantial thickness and rigidity, yet movable under force through said outlet opening.

5. A shipping container such as de-iined in claim 3, in which said locking means comprises an inner portion of said outlet seated on the top edge of said opening and an outer portion of said outlet overlying exterior side surface portions of said top wall forming said opening, and a closure securing said two outlet portions to such top edge and said side surface portions.

References Cited by the Examiner UNITED STATES PATENTS 1,627,042 5/1927 Mason et al. 229-56 2,454,919 11/1948 Hagan 220-63 2,557,576 6/1951 Simmons 229-14 X 2,721,674 10/1955 Lazard 22063 2,746,637 5/ 1956 Todd et al. 220-63 2,798,636 7/1957 Ketchledge 220-63 2,987,216 6/1961 Fletcher 220-63 X 2,989,208 6/ 1961 Gibbs. 3,054,549 9/1962 Humphrey 229-14 FOREIGN PATENTS 855,644 12/ 1960 Great Britain.

860,129 2/ 1961 Great Britain.

927,866 6/ 1963 Great Britain.

111,705 4/ 1961 Pakistan,

JOSEPH R. LECLAIR, Primary Examiner.

EARLE I. DRUMMOND, GEORGE O. RALSTON,

FRANKLIN T. GARRETI', Examiners.

D. T. MOOR'HEAfD, Assistant Examiner.

Claims (1)

1. A SHIPPING CONTAINER THAT IS HIGHLY RESISTIVE TO RUPTURE WHEN SUBJECTED TO SEVERE DROP TESTS AND ROUGH HANDLING, AND YET IS CONSTITUTED OF LIGHT, RELATIVELY INEXPENSIVE MATERIALS, SAID CONTAINER COMPRISING AN OUTER CASING, AND AN INNER CONTAINER SEPARATE FROM SAID CASING EXCEPT AT THE OUTLET FOR THE LIQUID CONTAINED THEREIN, THE BODY OF SAID OUTER CASING BEING COMPOSED OF A PLURALITY OF CONVOLUTELY WOUND LAYERS OF KRAFT PAPER BONDED TOGETHER TO FORM A RIGID MULTI-PLY, ANNULAR TUBE, A RIGID DISC-SHAPED TOP WALL AND A RIGID DISC-SHAPED BOTTOM WALL CLOSING THE ENDS OF SAID CASING BODY, SAID BOTTM WALL AT LEAST HAVING ITS PERIPHERAL EDGE PORTION DISPOSED AT RIGHT ANGLES TO THE ANNULAR WALL OF SAID CASING BODY TO FORM A RIGHT ANGLED JUNCTURE THEREBETWEEN, AN ANNULAR MEMBER PERMANENTLY SECURED TO EACH END OF SAID CASING BODY AND PERMANENTLY CONNECTING THE PERIPHERY OF AN ASSOCIATED END WALL TO SAID CASING BODY, SAID TOP WALL BEING PORVIDED WITH AT LEAST ONE OUTLET OPENING, SAID INNER CONTAINER CONSISTING OF A SEAMLESS, MOLDED, SINGLE PIECE OF PLASTIC MATERIAL FORMED TO PROVIDE AN ANNULAR BODY PORTION, AND TOP AND BOTTOM WALLS INTEGRALLY JOINED TO THE ENDS OF SAID BODY PORTION BY TOP AND BOTTOM ROUNDED END PORTIONS, OF WHICH THE BOTTOM ONE AT LEAST IS CURVED IN CROSS-SECTION THROUGH 90*, AND THE PLASTIC MATERIAL OF SAID CONTAINER BEING OF A THICKNESS SUCH THAT THE INNER CONTAINER CANNOT PER SE BE USED TO TRANSPORT LIQUID IN INTERSTATE COMMERCE, THE BODY OF SAID CLOSED INNER CONTAINER CONFORMING IN SHAPE TO THE INTERIOR OF SAID CASING WITH THE BOTTOM ROUNDED END PORTION AT LEAST OF SAID INNNER CONTAINER SPANNING THE RIGHT ANGLED JUNCTURE OF SAID CASING BOTTOM WALL AND BODY, AND PROVIDING A CUSHION AGAINST SHOCK IMPACT ON THE BOTTOM EDGE OF SAID OUTER CASING OF SUFFICIENT EFFECTIVENESS TO PROTECT THE PRODUCT HOLDING ABILITY OF SAID INNER CONTAINER EVEN WHEN SUCH BOTTOM EDGE OF THE OUTER CASING IS RUPTURED BY SUCH SHOCK IMPACT, AND SAID INNER CONTAINER HAVING AT LEAST ONE OUTLET INTEGRAL THEREWITH AND EXTENDING UP THROUGH THE OUTLET OPENING IN SAID TOP WALL, AND MEANS ON SAID OUTLET FOR LOCKING THE LATTER TO THE RIGID MATERIAL FORMING THE EDGE OF THE OUTLET OPENING.

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