US2391212A - Container and closure therefor - Google Patents

Description

Patented Dec. 18V, 1945 s PATENT OFFICE CONTAINER AND CLOSURE THEREFOR Francis J. Williams, Port Washington, N. Y., and

Morris Kaplan, Trenton, N. J., said Williams assignor to National Lead Company, New York, N. Y., 'a corporation of New Jersey Application September 11, 1943, Serial No. 502,058

(Cl. 22S-5.7) l l,

2 Claims.

This invention relates to containers and more y particularly to containers made of flexible or workable material and to a closure therefor.

One purpose of the present invention is to provide a container made entirely of a flexible or workable material such as paper or bre and characterized by an improved liquid tight closure capable of sustaining considerable weight for contents of high gravity.

In the packaging of semi-liquids and semisolids containing solids of high specific gravity,

the total weight pei` unit frequently reaches abnormally high values. This is particularly true of paints and pastes containing basic carbonate f White lead as the pigment. In packaging such materials, it is necessary to provide a container capable of retaining the oleaginous liquid present and in addition capable of supporting the weights encountered. Thus, a five gallon container suitable for pure white lead paint must be capable of carrying contents weighing 100 lbs., while a 31/2 gallon container for paste white lead must also be capable of supporting contents weighing 100 lbs.

Although paper containers capable of retainingv aqueous liquids are well known, no entirely satisfactory paper container has been found for holding oleaginous liquids or pastes of high gravities. In handling a container filled with a high gravity semi-liquid or semi-solid, tremendous pressures are exerted on the closures when such a package is dropped even for a very short or nominal distance. Due to the high weights encountered and the mobility of the contents, repeated handling of standard commercial containers ycontaining such materials invariably results in rupture of the closure or of the container. This invention provides a container and closure therefor composed entirely of a flexible material such as paper and of suflicient strength to withstand the high weights encountered when white lead paint and paste and other heavy materials are packaged.

The detailed features of the invention will become apparent from the following description of- A tube I of a flexible material such as paper, preferably wound spirally or convolutely, forms the body of the container. a plurality of plys of vmaterial so laminated as to build up a wall thickness of between about 200 and `300 mils.

This tube is thus continuously cylindrical and devoid of any interior shelf or' shoulder so that it can be easily lined with an oil-,proof material 2 which may be applied as an integral part of the winding or which may be the winding of the tube. This oil-proof lining may be selected from a number of materials available, such as grease-proof paper, parchment, Cellophane and the like. Either one or two laminations of the grease-proofing material may be applied with a suitable adhesive. Preferably, a well lapped single liner of suitable grease-proof paper is wound as an integral part of the tube.

The closure at the top and bottom of the container is achieved by means of a disc-shaped lid 3 the lower portion 4 of which is frictionally and coaxially insertable within the respective open ends of the tube l while the upper portion 5 of which, having a relatively larger diameter than .the lower portion, is adapted to rest upon the extremities of the tube wall but not to extend beyond the same. The disc-shaped lid closure 3, which may be oil-proofed, is fabricated by crosslaminating a plurality of plys of any suitable material, such as paper, and subsequently cutting to the desired shape and size. In order to simplify the cutting operation in forming the lid 3 as aforesaid, it may be desired to form two separate discs of the requisite diameters and thenfasten the same together into a unitary structure by means of staples and/or a suitable adhesive.

As shown in Fig. 3, additional tightness of closure may be assured by placing over-the open top and bottom end of the tube I a layer of oil-proof paper 6 before positioning the disc-shaped lid 3. This layer of oil-proof paper 6. which may be laminated if desired, is preferably disc-shaped and should have a diameter greater than that of tube l. When the lid closure 3 is applied over the layer of oil-proof paper 6, the latter is forced to assume the contours of the said lid closure, thereby to afford greater protectionagainst leakages To hold the lid closure'3 in place at 'the top and bottom of the container, an assemblage composed of an annular ring l and an annular depending sleeve 8 fastened together by any suitable means such as by staples and/or an adhesive material, is placed over` the said lid closure and is secured thereto and to theouter wall of the tube l This tube is wound of applied subsequent to by means of a suitable adhesive. Both the annular ring and the annular depending sleeve, like the tube wall itself, are constructed of a flexible material such as paper and the thickness of each component of the annular assemblage should be at least equal to the wall thickness of the tube. In order to attain greater structural strength, the annular assemblage may be wound of stronger paper or other flexible material than the tube itself or else both the annular ring and the annular sleeve may be built up to a thickness greater than the wall thickness of the tube. For exceptional strength. both of the aforesaid expedients could be employed. It is to be understood that the annular Aring and the emular depending sleeve are each separately wound and after being cut to proper size are fastened together in any suitable manner.

'Ihe annular assemblage serves both to keep the closure tight and to carry the weight of the package and its contents when the package is standing, is handled or is dropped. Further, the annular assemblage produces a deadening or cushioning effect when the container is droppedy and additionally provides convenient areas for rolling the drum when loaded. vThis is ascribed to the capability of slight,l slippage permitted between lid and-body thereby tending to avoid rup- `ture.

'The outer surfaces of the container wall I, the annular ring 1 and the annular depending sleeve 8 may be water-vproofed by any suitable means, such as by winding onto thesaid components an'outer ply of water-proof material when the same are being' fabricated. Also the outer surface ofthe lid closure 3 may be rendered waterproof by laminating on the same an outer ply of water-proof material. Further protection may be achieved by dipping the cut edges of the annula assemblage in a water-prooiing material.

While the above description shows a preferred embodiment of the. present invention, it is to be I distinctly understood that the same is not limited thereto since it is believed that many minor modiiications of the invention herein described will readily suggest themselves to those skilled in the art to which this invention relates.

Having thus described our invention, we claim the following as new and useful:

1. A shipping container for high-gravity materials comprising a tubular body Vcomposed of paper-like stock devoid of any interior shelf or shoulder, a two-diameter rigid lid of like material applied to such body with its part of smaller diameter inserted into and frictionally bearing against the interior surface of the body and its part of larger diameter bearing against the end of the body wall and serving to limit the penetration oi the smaller part into the body, and a band and ring assemblage composed of like material. prefabricated to fit on said body containing the lid and for securing the lid. comprising a cylindrical band snugly telescoped over the body and the exposed edge of the lid and glued to the body and a ringt permanently attached to the interior of the band to bear upon and clamp the larger diameter part of the lid upon the end of the body wall. r

2. A shipping container for high-gravity materials comprising a tubular body of paper-like stock and a two-diameter lid of the same kind of stock inserted in and frlctionally iltting against the interior tubular body surface and the part of larger diameter bearing upon the end of the body wall and serving to limitpenetration of the smaller part into the body, said lid being capable of some slippage relatively to the interior body surface under the effect of corner impact, a band and ring assemblage prefabrlcated out of like stock attached to the body in non-slipping relation thereto and comprising a cylindrical band snugly telescoped over the body and over the exposed edge of the lid and glued to the body and a ring permanently attached to the interior of the band to bear upon and seal the lid in place.

FRANCIS J. WILLIAMS.

MORRIS KAPLAN.

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