Патент USA US2407640код для вставки
F. GILBERT, .JR _ - CONTAINER AND METHOD oF MAKING SAME> ' Filed May 4, 1942 ví a l „1. I l ‘2:5551 v INVENTOIR FRANK GILBERT, Je. El? el. ATTORNEYS Patented Sept. 17, 1946 2,407,639 AUNITED STATES ?- PATENT OFFICE l 2,407,639 CONTAINER AND METHOD OF MAKING SAME Frank Gilbert, Jr., Olmsted Falls, Ohio Application May 4, 1942, Serial No. 441,649 - s claims. (C1. .9s-s6) This invention relates to animprovement in containers and methods of making said contain ers. More particularly, this invention relates to a method of rendering containers of fibrous sheet provide a bottom closure for the tube II. The tube I I is closed with a top cap I4 similar :in con struction to the bottom closure of the tube II. material exceptionally rigid, liquid-proof and prised of a spirally Wound tube 2| closed at one end with a bottom closure cap 23 of stamped paper and at the other end `With‘a top closure cap 24 of stamped paper. The bottom cap 23 is provided with a suitable spacer 25 and the tube 20 represents an inner shell or container com impervious to most common gases and vapors. Heretofore, containers of `ñbrous materials, such as paperboard, chipboard, strawboard, or like paper stocks, generally have not been satis factory for packaging heavy materials or mate 10 rials which are likely to lose or absorb moisture. In the first place, such containers seldom pos sessed suñicient rigidity unless the wall thick nesses were increased to unwieldy proportions.` 2| is likewise provided with suitable centering spacers 26. The outer shell I0 and the inner shell 2u are both preferably comprised entirely of ñbrous sheet material, such as heavy kraft paper, chipboard, paperboard, strawboard, or like paper In the second place, such containers, unless they 15 stock. The outer surfaces of the outer shell Ill were lined with comparatively expensive im pervious liners, Were not impervious to gases and vapors, such as air and moisture vapor. Conse quently, the general practise has been to employ may be suitably glazed or lacquered and may carry any desired printing or label. The inner surface of the tube 2I and cap 23 may also be suitably glazed or coated, if desired. As will be more expensive metal or glass containers when 20 apparent from the following, it is preferable that the substance to be packaged required a rigid and impervious container, particularly when it was desirable to maintain a vacuum within the sealed container. the inner surface of the outer shell I0 and the outer surface of the inner shell 20 should be unglazed or, at the most, only slightly glazed or ñnished in order to allow the shells to be impreg It is an object of this invention to .provide an 25 nated with the filler. Also, it is preferable that inexpensive container of ñbrous material which the top cap 24 be made of porous stock carrying Will be substantially impervious to common -only a small amount, if any, of sizing or iiller liquids, gases, and vapors and which will possess >which tends to render the stock non-porous. a rigidity and strength approaching that of the` The closures for the outer shell II) are shown as well-known metal and glass containers. 30 being of the well-known spun tube and disk con Another object of this invention is to provide struction and the closures for the inner shell 2|]l -a ñbrous container and a method of sealing " are shown to be stamped paper caps, in order which will permit a vacuum to be created and to illustrate twotypes of closures, each of which maintained within the container. may be used for both shells. Obviously, other It is also an object of this invention to provide types of end-closures may be used for the shells a double-wall container having a hermetically where such other types of closures would be con sealed space between the walls of the container. venient and practical. Other and further objects and advantages of The several spacers 25 and 26 are preferably this invention will be apparent from the follow embossed or deeply scored projections on the ing speciiication, claims, and drawing, in which: 40 inner shell 20. Such spacers, however, may also Fig. 1 is a cross-section of an outer shell and _be made by attaching strips or spots of paper an elevation of an inner shell showing a manner stock, or non-porous material, such as sealing of assembling acontainer made according to my wax, to the outer surfaces of the inner shell 20. invention. > It is also apparent that the same function of Fig. 2 is a cross-section taken along the line 45 centering and spacing the inner shell Zû in the 2_2 of Fig. 1 showing one form of an assembled outer shell III would be served by similar spacers container made according to my invention. _on the inner surface of the outer shell I0. Fig. 3 is a view similar to Fig. 2 showing an A preferred manner of assembling my con other form of an assembled container made ac tainer is shown in Fig. 1. The open outer shell cording to my invention. I0 is partly ñlled with a molten filler 3U which In the drawing, in which like reference charac is substantially solid at normal atmospheric tem ters refer to like parts,` I0 represents an outer peratures. 'I‘he closed inner shell 20, ñlled with shell or container’ comprised of a spirally wound the substance to be packaged, 40, is then inserted tube Il having one end spun in to provide anY , vinner flange I2 on which a diskV I3 is seated to in the outer sneu Io while the nner sa is stm in a nuid condition. ` As the inner shell 20 is placed 2,407,639 3 within the cuter shell so that it is centered in the outer shell by the spacers 26 and spaced from the bottom I3 by the spacer 25, the molten ñller is extruded up between the walls of the inner and outer shells, completely filling the space therebe tween up to the level attained due to its displace ment by the shell 20. The filler 30 is then allowed to solidify. The cap I4 may be placed on the open end of the shell IIJ either after or before the filler solidifies, depending upon whether a com pletely filled container, as shown in Fig. 2, or a hollow wall container, as shown in Fig. 3, is de sired. The ñller 3D is preferably a wax, such as paraf fin, and/or a resin, such as pine rosin, which will 4 applied to maintain the spacer 25 in contact with the bottom I3 until the filler solidi?ies suñiciently to prevent the inner shell from floating. If the filler tends to shrink when cooling, a sufficient amount of filler should vthen be added to fill the outer shell before closing it with the cap I4. The container illustrated in Fig. 3 is provided with a substantially hollow wall. This construc tion is obtained by placing a slightly lesser amount of filler inthe open outer shell Il), in serting the closed inner shell 20, closing the outer shell with the cap I4 and then, while the filler is still molten, inverting the package so that filler will flow into the space between the cap III and the inner shell 20. To prevent the inner shell 20 from falling into said space, it is preferable not only solidify into a rigid mass at atmospheric to provide the cap 24 with a spacer 21, .as shown temperature but which will also penetrate and in Fig. 3. To prevent the filler from freezing> or impregnate the walls of the inner and outer shells. solidifying as the package is inverted, so that flow A mixture of paramn wax and rosin is often pref-` erable for the filler 30, since the mixture of the 20 of the filler into the space between the caps 24 and I4 would be prevented, it is particularly de two cheap constituents of such a filler is less sirable that the contents of the shell 20 be heated. brittle than either of the constituents alone. It is obvious, however, that one may use any other By repeated inversions of the package as the filler cools, a hollow wall container, in which both‘the suitable and normally solid filler, plasticized 'if necessary, which is substantially impervious to 25 inner surface of the outer shell I0 and the outer surface of the inner shell 20 are impregnated and the gases, vapors, or Aliquid which it is desired hermetically sealed, will be obtained. In most in either to retain in thè packaged contents 40 or stances, flns or flutes of filler will extend between from which the packaged contents are to be pro the shells, thereby strengthening the walls of the tected. A mixture of paraffin wax vand pinerosin g is usually a satisfactory filler when it is desired 30 package. From the foregoing, it should be apparent that to have the package impervious to air, water and containers made according to this invention may water-vapor, and 'many petroleum products. How be modified as to the shape and structure of the my container prevents leakage of petroleum prod inner and outer shells, the closures therefor, and ucts which normally seep or wick through vessels consisting only of paper stock or only of the filler 35 the composition of the filler as the requirements of specific packages -will -dictate to those skilled is not understood. in the art. It is to be understood, therefore, that By employing a top cap 24 which is of porous this invention is not to be considered to be limited stock, I achieve a vacuum packaging of the con to the specific embodiments disclosed, either in tents 40. When the closed inner shell 20 is in whole or in part, but by the following claims. serted into the outer shell I0 partly filled with What is claimed is: ' the hot molten filler 30, the contents 40 are heated l. A method of rendering a container of fibrous and expanded, expelling air and other gases material substantially impervious and of increas within the shell 2li through the porosities of the ing the rigidity of said container comprising the inner shell 20, and, particularly, through the steps of placing in an outer shell of fibrous stock porosities of the cap 24. As the filler 3B, which> a quantity of liquid filler which is normally sub surrounds the inner shell 20, cools and solidifies, stantially solid, inserting an inner shell of fibrous however, the porosities in the shell 2Il are filled stock in said outer shell while said filler is liquid and impregnated by the solidifying filler. _Con to extrude said filler between the walls of said sequently, air does not return into the inner shell shells, and then allowing said filler to solidify. as the contents of the inner shell (including re 2. A method of rendering a container of fibrous sidual gases, if any) cool and tend to contract. _material substantially impervious and of in Thus, the inner shell is thoroughly sealed and creasing the rigidity of said container comprising I at least apartial vacuum is created and main the steps of partly filling an open outer shell of tained within the inner shell. fibrous stock with a molten filler which is nor It is often preferable and advantageous to have mally substantially solid at atmospheric tempera the inner shell 20 and contents 40 heated when tures, inserting a closed inner shell of fibrous the inner shell is immersed in the molten filler stock in said outer shell while said filler is molten 30. The advantages generally obtained are: first, to extrude said filler between the walls of> said freezing or solidiñcation of the filler is delayed, vshells and to impregnate the inner surface of thereby preventing the formation of voids which said outer shell and the outer surface of said extend across the space between lthe shells and inner shell at least partly with said filler, and cause portions of the walls of the shells to be maintaining said inner shell within and spaced uncoated or unimpregnated by the filler; second, from said outer shell while said filler is allowed impregnation of the inner surface of the outer to cool and solidify. . _ ` shell and of the outer surface of the inner shell 3. The method of sealing and creating a vacu is assisted; third, the vacuum within the inner um within a container of fibrous stock comprising shell tends to be increased. thev steps of ñlling a quantity of moltenfiller, In the container illustrated in Fig. 2, the filler which is normally solid and substantially im 30 completely fills the space between the inner permeable to gases, in ari open outer shell, placing Y and outer shells. This construction is obtained a closed inner shell, of which at least a- portion by placing in the open shell I0 a volume of molten is comprised of "porous fibrous stock, within said filler approximately equal to the total volume of outer shell, the quantity of filler in said outer space between the shells and the volume of filler ' shell being sufficient to permit ,said inner shell impregnated in the shells. If Vthe inner shell tends jto float in the moltenf'iller, pressure should be 75 to be submerged in said filler- andthe fibrous 5 2,407,639 6 stock of said inner shell being suiiiciently porous to permit gases enclosed in said inner shell to escape through said fibrous stock, and then al-lowing said filler to solidify While said inner shell is submerged. heating the contents of said inner shell prior to inserting said inner shell in said outer shell, and maintaining said inner shell submerged in said filler and impregnating agentand spaced from 4. The method of sealing and creating a vacu um Within a container of ñbrous stock as deiined ing agent is allowed to cool and solidify. » in claim 3 including t-he stepsof heating the con tainer of fibrous stock Whichis impervious to liquids and gases comprising the steps of partls7 tents of said inner shell to a temperature above normal atmospheric temperatures prior to insert ing said inner shell in said outer shell, and in serting said inner shell in said outer shell while said outer shell while said liller and impregnat 7. The method of making a double Wall con ñlling an open outer shell of ñbrous stock with a molten ñller and impregnating agent which is normally solid at atmospheric temperatures, in said contents are heated. serting a closed inner shell of ñbrous stock in 5. The method of making a container of fibrous said outer shell while said ñller and impregnat stock substantially impervious to liquids and 15 ing agent is molten to extrude said filler and im gases comprising the step of partly ñlling an open pregnating agent between the Walls of said shells outer shell of fibrous stock with a quantity of and to impregnate, at least partly, a portion of molten ñller and impregnating agent which is the surfaces of the Walls of said shells, closing normally substantially solid and impervious to said outer shell, and then inverting said shells the liquids and gases to which it is desired to while said ñller and impregnating agent is still render the container impervious, inserting a molten but While said shells are cooling to im closed inner shell of ñbrous stock in the outer pregnate, at least partly, the remainder of the shell While said ñller and impregnating agent is inner surface of the Walls of said outer shell and still molten to extrude said filler and impreg the outer surface of the walls of said inner shell. nating agent between the Walls of said shell, al- 25 8. The method of making a double Wall con lowing said ñller and impregnating agent to cool tainer of iibrous stock as defined in claim 7 in and solidify, pouring »an additiona1 quantity of cluding the steps of heating the contents of said ñller and impregnating agent in said outer shell inner shell prior to inserting said inner shell in to iill said outer shell completely with said ñller said outer shell, and maintaining said inner shell and impregnating agent, and then closing said 30 spaced from said outer shell while said i-lller and outer shell. impregnating agent is solidifying and impregnat 6. The method of making a container of fibrous ing the Walls of said shells. stock substantially impervious to liquids and gases as deñned in claim 5 including the steps of FRANK GILBERT, JR.