Патент USA US2403855код для вставки
' @559, ‘1946. CONTAINER CLOSURE F.‘AND GILBERT, METHOD OFJR CLOSING‘ CONTAINERS 2,43u . 1250 w 'v ' M0 , ,INVENTOR FRANK GILBERT, JR. 210' Z12 . BY MW ‘3% g - ‘ATTORNEY-5 ' . 2,403,855 :v A i ._ 2,-4os,s5'5,~""> , 1'» ~ ' Y ' 'CONTAINERCLOSUREAND METHono CLQSINGCONTAINERS ,1. __ , Frank .iGilbert. vJr, Olmsted Falls, ‘Ohio . _ ‘ , Appucaitn Julylo, 1942, Serial/No. 450,378 I 1 2 This invén?oeipériainsto‘ imrirorémehis "i1? / I made i I vof standardc aps and, so_ _ cia1 I convertingv machinery for forming the . 636125 ' and disks is notr'equiredf Because of the strength‘ container closures'and a method OfHCIOSIiHgCOH-f tainers.v _'More particularly, this inventionrelates to stiff, water and jmoistureproof, paper closures ' ' andfrigidityof. my improved ;endj closures, they for cans, jars/bottles, andthe like,.,as. wellfas ~ may _be employed as the ; end ,closuresllof large ‘ giamemepaper containers, such as one, twojcand five gallon buckets and pails, for example. ;' j; j," for, rigid; and ‘s'emi-rigid_i_ paper containers. @This application is .a .continuationein-part of my. 00,-. pending applicatiom SerialiNp. 441,649, ?led _May “It is. another object ofmy invention.t_o..,pro-,v 4,1942. vide' a paper closure which is I substantially ' m'oisa ' " f, . I 'ture and vaporproof andprovides a substantially Paper container closuresorv en'dfmembers have permanent seal for cans, jars,'bottles, and)‘: the long been employed for tubular'paper contain-_ ers. Paper containers for dry, light-weight prod like, as well as for paper, containers. Itisla'n advantage’of my invention that it may befsub-i stituted for, the relatively expensivetin', covers utcs not critically affected by moisture, usually are comprised of a wound tube of paper stock‘ 15 and closures heretofore employedi-as'closures for ucts, such as, forexample, cereals or like prod closed with adhesively secured. paper caps. Such paper caps are stamped or formed from a sheet, of lightly calenderediand sizedfpaper stock, usu ' jars of many foodstuff and other products. 1 ‘An: , other advantage of my invention is that no gas. keting. material,'_ such . ally while the stock is damp,rso that the caps are provided with an integral?ange. _ Although such caps are inexpensive,v the. porosityof the stock like,isrequired. , . ~ as rubber, cork, lorwthe , ,. , , A still furtheradvantage of, my invention is 20 that, while heavily calendered and, sized,.>D.aper stockmay be'employed in some instances, in most instances cheap porous stock is preferred for my from which the caps are made generally renders _‘ the caps unsuitable’for’ packages of wet or liq uid products. When wet orliquid products, such as,-for example, ice cream, pickles, and the like, 25 containerclosures. Other objects and advantages ' ' . of my ., ..invention “ V are packaged in tubular paperfcontainers, such con will be apparent from the following speci?cation, tainers are usually wound tubes'of heavily cal claims,and'drawings' in which: _ ‘ . w , ' .Fig. 1 is an exploded, sectional viewillustrating endered and sized paper stock spun in at one end to provide a seat for a tightly'z?tting pa- ' one method of making my closures.v j ,7 _ Fig. 2 is a sectional view of a tubular paper per closure disk; the closure for the other end of such tubes is usually a slip cover comprising container closed at one end with a reinforced a short tube spun in to. provide a seat for a sec closure made according to my invention. ond tightly ?tting paper disk. Such tubular con tainers for wet or liquid products are often coated 7 Fig. 3 is a sectional View of‘a'modi?ed rein or waxed to render the containers substantially , forced closure made according to my invention. Fig. 4 is a sectional view of a wide mouth glass water and moistureproof. Even when such disk closed paper containers are thus waterproofed, tomyinvention. container closed with a closure made according ,' ' V _ ("a In- the-drawings, in which like reference char acters refer to like parts or elements, the thick nesses ofthe elements arev distorted for clarity of illustration. In Fig. 1, l0 represents a stand'_ they are generally employedonly as more orv 168$ temporary containers‘ and seldom ‘as permanent 40 containers for’ wet or liquid products. 1 When tubular paper containers are employed vard stamped‘cap of relatively porous paper stock for packaging. heavy products, either wet or dry, provided with a ?ange II integral with the bot relatively inexpensive metal endclosures are gen erally erimpedon the ends of_ the paper tubes, 4 5 tom l2. A quantity of a normally substantially solid impregnating and ?lling agent 20 is poured particularly when .the',cross-sectional area of the ; in the cap ill in, a liquid and impregnating con‘ tubular container is relatively large. ? In such in dition. While the impregnating agent/2U is' in a . istances,vstandard paper closures possess neither liquid and impregnating condition, a porous pa per ,reinforcingsheet 3B, is immersed in ‘the im pregnating agent 20. ‘The reinforcing sheet 30‘is theJStrength nor rigidity afforded, by the metal .en'dvclosures. ' , . It isan object ‘of- this invention to provide a reinforced ‘paper container closure which ap ~ preferably a disk or sheet of porous paper-board, proacheslthe strength and rigidity of. the metal end ' closures employed heretofore. It is a par .ticular' advantage of_ my invention that the pa :perv elements of .my, reinforced closure may be} 55 a such as the'corrugated paper-board comprised of a corrugated-sheet 3| and cover sheets 32 and 33, as shown inFig. 1.v . ' ' , 7 ‘Due to the porous and capillary nature ofv the 2,403,855 3 cap HI and the reinforcing sheet 30, the liquid impregnating agent wicks into the inner surface of the cap l0 and into all ?brous elements of the reinforcing sheet 30 as well as ?lling the interstices of the corrugations of the sheet 3|. Due to entrapment of air and slight shrinkage ‘of the impregnating agent upon solidi?cation, slight voids 2| in the impregnating agent may 4 ployed, a convenient manner ofsecuring the clo sure to a container is to seat the open end of the container, having outside diamensions equal to the inside dimensions of the ?ange ||, against the reinforcing sheet 30 as the impregnating agent is allowed to cool. In such instances, the impregnating agent will creep between the inner wall of the ?ange and the outer wall of the con tainer so that, upon solidi?cation of the impreg be ‘found under the corrugations in the sheet 3| and the cover sheet 33. Due to the ?lm 10 nating agent, the closure will be securely sealed to the container. If the container is a spirally wound paper tube 40, as shown in Fig. 2, the im pregnating agent will also impregnate the closed end of the container to a certain extent, de ing a su?icient quantity of impregnating agent ' 20, a ?lm 23 of impregnating agent will cover 15 pending upon the porosity of the paper in the strength of theimpregnating agent, a ?lm 22, of impregnating agent will usually separate the bottom I2 from the cover sheet 32. ‘By employ-E the cover sheet 33. By allowing the impregnating agent 20 to so lidify, the cap l0, impregating agent 20‘ and. re- > inforcing sheet 30 become a strong and especially container All. I Fig. 3 shows adisk type of paper closure made according to my invention, in which a spira1 wound paper container I40 is closed in the con rigid unit in which the paper elements are thor-r 20 ventional manner by a disk I | 2 seated on a spun in flange |||._ ' The closed container I40 thus af oughly united by the solidi?ed impregnating fords a shell, similar to the cap ||, for'receiving agent.- For some reason, the impregnated ?brous a quantity of the liquid impregnating agent 20. paper elements appear to have greater strength A reinforcing sheet |30 of porous paper stock is and rigidity than the sum of the strength and rigidity of the paper elements and an equal 25 then immersed in the liquid impregnating agent. As the impregnating agent solidi?es, it thorough thickness of the impregnating agent. Without re- _ ly impregnates the reinforcing sheet I30, the stricting myself to one theory, I believe this inner surface of the disk H2,‘ and the inner sur greatly increased strength is due to the relatively face of the container M0, thus providing a strong, high ?lm or surface strength of the impregnating agent. By impregnating the agent in the ?brous 30 rigid, and sealed closure. My reinforcing sheet need not be a sheet of cor elements and providing a plurality of ?lms of rugated paper-board, as shown in Figsfl to 3, the agent, the surface area of the solidi?ed im but may be a single ply of porous'paper stock, pregnated agent is many times greater than the such as paper-board, straw-board, chip-board, surface area of a homogeneous quantity of im or the like. Further, my closures are not limited pregating agent of the same thickness. The voids to use on paper containers, An example of a 2|, unless excessive, do not appear to appreciably single ply reinforcing sheeet and an example of decrease the strength and rigidity of the closure, my closure applied to a container having non since, as pointed out above, the strength of the porous walls is shown in Fig. 4. A paper cap 2H1 closure appears to be ‘primarily attributable to 40 having a ?ange 2| | integral with the bottom 2|2 the impregnated paper elements. is ?lled with a quantity of liquid impregnating As is apparent from the foregoing, the impreg agent 29. A single ply reinforcing sheet 230, in nating agent should be normally solid but should be obtainable in a liquid and impregnating con this instance previously secured to the mouth of dition. It is also preferable that the impreg nating agent be impermeable to the liquids and gases either which should be retained in the pack a glass 240, ?lled, for example, with jelly, is then immersed in the impregnating agent. In order aged contents or from which the contents should be protected. Such liquids and gases are com monly water and water vapor. The impregnat ing agent is preferably meltable in order that heat alone will render the impregnating agent liquid, although soluble impregnating agents or that the impregnating agent 2|] may also serve as a seal, it should also wet the. surface of the non-porous container 240. Thus, a sufficient quantity of the impregnating agent is employed so that when the mouth of the container closed by the reinforcing sheet is immersed in the im pregnating agent, the impregnating agent will be forced up between the ?ange 2H and the walls of the container. Due to the wetting action of inous condensation products may be employed. I have found that an inexpensive'impregnating 55 the impregnating agent, the agent will tend to creep up the outer walls of the container 240. agent which is normally solid, water and mois When the impregnating agent has solidi?ed, a ture vapor proof, and meltable. is a solution or thoroughly sealed rigid closure for the glass 240 mixture of paraf?n wax and pine rosin. ' Such will be provided. a mixture is solid but less brittle than either of In the embodiments disclosed, the reinforcing its-constituents. Where the paraffin-pine rosin 60 sheets have been impregnated by immersing the impregnating agent is not su?iciently inert to porous reinforcing sheets in a quantity of liquid the products to be packaged, a wide range of impregnating agent in the standard paper. clo other, but usually more expensive impregnating sure. This method is usually preferred because agents are available to those skilled in the art. For example, a particular inert impregnating 65 of the simplicity of operation and because no special closure forming machinery is required. agent which will greatly increase the strength, However, the standard closure and reinforcing rigidity, impermeability, and hardness of the clo sheet may be impregnated separately and then sure is alcohol-modi?ed urea-formaldehyde resin united. by placing the impregnated reinforcing condensed and polymerized (thermo-set) in the 70 sheet in the impregnated closure. The applica ?bers of the paper elements. agents which are polymerizable or which are res When a reinforced cap type of closure, such as shown in Figs. 1 and 2, is employed, the clo sure may be secured to a container with suitable adhesives. When a meltable impregnating agent, such as my paraffin-pine rosin mixture, is em tion of heat and pressure, in the case of meltable impregnating agents, or a solvent andpressure, in the case of soluble impregnating agents, will weld the impregnated closure and reinforcing 75 sheet together. Another satisfactory method of 2,403,855 6 impregnating the closure is to punch a plurality of holes through the reinforcing sheet before the uct or container may not be satisfactory for reinforcing sheet is placed in a cap. tion is not limited to the speci?c embodiments disclosed, but may be varied by those skilled in the art within the scope of the appended claims. The cap and reinforcing sheet are then secured over one end of an open ended tube. A quantity of liquid impregnating agent is then placed in the con tainer so that the impregnating agent will im others. It is apparent, therefore, that my inven What "is claimed is: . 1. As an article of manufacture, a stamped pregnate the exposed surface of the reinforcing ' 7 ‘paper cap comprised of an integral bottom por sheet and, by ?owing through the holes in the reinforcing sheet, will seep between and impreg tion and a ?ange portion, a reinforcing sheet of corrugated paper comprised of a central corru nate the adjacent surfaces of the reinforcing sheet and the cap. The few small holes in the reinforcing sheet do not materially affect the gated sheet and cover sheets, said reinforcing sheet being located within said cap and covering the inner surface of said bottom portion, and a strength of the reinforced closure when the im solid impregnating agent substantially completely pregnating agent has solidi?ed. 15 ?lling the voids of said reinforcing sheet and im pregnating the inner surface of said cap to unite Meltable impregnating agents containing sub- _ stantially no volatile solvents are generally pre said cap and reinforcing sheet into a rigid con tainer closure. ferred. Solvent loss, the minute porosity caused 2. The method of making a, rigid paper con by evaporation “of the solvent, and escape. into and possible contamination vof the contents of the 20 tainer closure comprising the steps of placing a quantity of normally solid molten impregnating closed containers are thus avoided. When melt agent in a paper container closure cap, immersing able impregnating agents are employed, ‘care must be taken to secure thorough impregnation of the paper elements of the closure by prevent a paper reinforcing sheet in said molten impreg agent. cap and sheet, and then allowing said impreg nating agent to become solid to unite said impreg nating agent, allowing said impregnating agent ing an over-rapid cooling of the impregnating 25 to-impregnate adjacent surface portions of said Where my closure is used toseal a con ,tainer ?lled with heated contents ‘at or near the melting point of the impregnating agent, such over-rapid cooling is usually prevented. Other wise, it is often advisable to apply heat by suit-‘ able hot plates or ovens until the impregnating nated cap and sheet. - - 3. The method of sealing and reinforcing the bottoms of containers comprising the steps of placing in an open-ended paper container having a porous paper bottom a quantity of normally 4 solid impregnating agent while said agent is in Although the paper containers in the embodi a liquid state, immersing a sheet of porous paper ment disclosed have wall portions which are made of spirally wound paper tubing having a 35 stock in said impregnating agent to cover the agent thoroughly impregnates the closure. circular cross-section, it is not to be understood , that my invention is to be limited to paper con tainers having such wall construction. For ex ample, my invention may be employed to rein bottom portion of said container, allowing said impregnating agent to impregnate adjacent pore tions of said reinforcing sheet and said con tainer, and then allowing said impregnating force the closures of the so-called “collapsible” 40 agent to solidify. 4. The method of closing containers compris cartons in which the walls are formed from a ing the steps of placing in a paper cap a quantity of normally solid impregnating agent while in a liquid state, covering the mouth of a container are normally formed by interfolded ?aps integral with the tubular walls. Therefore, it is to be un 45 with a paper reinforcing sheet, inverting said container and forcing the paper sheet covering derstood that the term “tubular paper contain the mouth of said container below the surface of ers” as employed in the claims may apply to the liquid impregnating agent in the cap, said wound containers,‘ either spiral or convolute, or cap, container mouth, and quantity of impreg folded containers, of either the collapsible or set up type, and that the term “tubular” applies to 50 nating agent being so proportioned that a portion of the impregnating agent will be extruded be tubes having a polygonal cross-section as well as tween the cap and the walls of the container ad a circular cross-section. jacent the mouth of the container, allowing said From the foregoing, it is apparent that the em impregnating agent to impregnate adjacent sur bodiment disclosed may have to be varied by face portions of said cap and sheet, and then 3.1- , those skilled in the art to meet the needs and re 55 lowing said impregnating agent to solidify to unite quirements of speci?c types of containers and said cap and sheet into a rigid container closure products to be packaged in such containers. blank of paper stock formed into a. tube having a rectangular cross-section and the end closures Further, normally solid impregnating agents which may be satisfactory for one type of prod. sealed to said container. FRANK GILBERT, JR.