US2280239A - Sanitary preserving can or container and the making of it - Google Patents

Description

Aprll 21, 1942. Y -H KARL 2,280,239 SANITARY BRESERYING GAAN 0R CONTAINER AND THE MAKINGAOF IT Filed July 15, V193'? 2 sheetslsheet 1.

Aprilzl, 1942. -HKARL 2,280,239 SANITARY PRESERVING- CAN OR CONTINEYR AND THE MAKING OF IT Filed July '15, 1957 2 Sheetsshet-z Patented Apr. 21, 1942i sANlTanYrnEsEavmG CAN oa coN- 'rAlNEa AND 'ma MAKING oF rr Heinrich 1mi, Jersey city, N.-J. v Application July 15, 1937, Serial No. 153,747

5 Claims. (Cl. 229-35) The aforesaid improvements refer chiefly to the imprinted coat or coatings of the interior sides of the cans or containers including those of` the top and'bottoms and of additional linings and of covering means thatare placed between the contents of the can and the top andl bottom thereof, respectively.

These cans or containers refer chiefly to the kind that are made of other materials than sheet metal or that have at least the main parts thereof made of a non-metallic material. Such nonmetallic materials include chiefly fibrous sheet materials in blank form, such as, paper, card board, butl others may be included, as, for instance, impregnated cloth, cellulose materials, an

vini'erior kind of nitrocellulose such as pyroxylin and others.

I More particularly the coat or coatings of the innermost side of the can body are made in such way and are of such character that they can be inspected easily and even tested before the whole blank (or several, if the can is constituted by morethan one blank) is, or are, wound into the can body.

The inner blanks formthen the parts of at least the inner walls of the can or container body and of the top and bottom.

It has been proposed already to coat the interior side of a iinished vessel .or can by painting or by pouring inthe lacquer or other material that the latter is of a character diiierent from a foil is to form the interior coat and to let drain out l the surplus material.l The coatings made in this way-would not only be far costlier but they could not be inspected so thoroughly and easy besides that faults could not be repairedin such simple and thorough way as it is possible with the present scheme.

According to the scheme of this invention the coat or coatings forthe interior side of the can are preferably made right on the large sheet from which the blanks will be cut that have to form the interior side of the can or container and deals with a can or container that will have an inner and an outer wall and a packing therebetween with reinforcing strips of steel or wires or 'bres.

This permits again the inspectionof the coatingsand the correction of ilaws. Parts that are insufficiently covered may then be recoated and 'bottom joints.

this. mode of creating the air, water, moisture, steam, oil, grease and in some respects also acid proof coatings for the preserving cans or' containersv guarantees a perfect sanitary preserving can or container after the various parts (the can body, the bottom and the top) are assembled and secured together with the adhesive binders that suit best for securing the seams (such as the side seams or overlapping endparts) andthe top and It has been proposed already to make linings for boxes or vessels such as containers for milk etc. and to line the inner walls there of with aioil of a suitable metal, such as, tin or aluminum and that foil is secured with an adhesive. Also in the present invention it is contemplated to have the interior lside of the can or container covered with a metallic coating but since it is obtained by iirst applying a coating of varnish then powdering that coating with powdered metal, the so-called bronze, then byV fluxing the areas covered withthe powdered metal and ilnally 4by applying molten metal to the so fluxed powdered metal. This innovation has been claimed already in the application Serial No.

702,345 that was illed December 14, 1933, and of which division was required. The method of covering and the finished product covered with a vlayer of solid metal is claimed in my United States great simplification to'si'mply coat the innermost side of the blank either the one for forming the can body wall or the lining with a solution of nitro-cellulose suchas a lacquer of pyroxylin and in most cases a coating with a nitroncellulose lacquer will suiiice for preserving eatables and also beverages for a considerable period. This lacquer is even preierableto a coating of metal since it will not transmit the metallic taste to eatablcs and beverages'.

The different materials for the `coatings will he applied in a similarway by'machinery of which a preferable system isshown. A,

VAnother improvement, disclosed bythe present invention, consists of the canor container 'b'ody having an inner wall and an outer wall and a packing of an economical material, as, for instance, asphalt. placedbetween the inner and outer wall and in addition'` reinforcing parts such as steel strips and wires'ormeshed steel strips or mesheci or crosswise arranged wires laldin said packing. Fibres and dried grassesor weeds may linen 'in my U. S. Patent No. 2, 049,264 and to coat one of the sides thereof with nitro cellulose or with a solid layer of metal that has a base of varnish covered withpowdered and iiuxed metal. This innovation and improvement is especially adapt Aable when the tops and bottoms of the can or container are not covered on their interior sides with a layer of nitro-cellulose, or of a solid metal. The reason, for not covering the top `or bottom with one of these coatings. may be that the material of which these tops and bottoms consist is too coarse or too porous.

other advantages win be described in the now following detail description.

In the drawings forming part of the specification the- Figure 1 represents one of the modications of the 'preserving can in a sectional ,elevational view, showing the reinforcing steel strips placed in an oblique position.

Figure 2 shows on a reduced scale the single blank for making the can body of Figure 1 ready to be rolled into the shape of the can body and having therefore allthe parts placed thereon that constitute that can body wall and having therefore also the coating applied to the part that forms then the innermost surface oi' that can Flaute 3 'is a sectional view taken on the line 3 3 of Figure 1 but of the completed can body, showing thereby the arrangement with the overlapping portions of the blank;

Figure 4 shows-a fraction of the can body wall with the reinforcing steel strips placed in a horlzontal position: Y 4

Figurebshows a fraction of the can body wall with the reinforcing steel strips placed in a vertical position: A

Flaute 6 shows a fraction of the can body with the reinforcing steel strips arranged in a meshyv fashion;

Figure 'I shows a fraction of the can body with the reinforcing parts formed of steel wires instead of steel strips and being arranged crosswise.

Figure 8 shows a modification of the can body y the nitro-cellulose lacquer etc. to the area of five in a sectional view whereby two blanks (an inner coating um is either applied u that interior side of that inner wall or to the exterior side ofthe Figure 10 a sectional view of a fraction' of can body. having a special inner liner which Viscoatedonitsinteriorsidebutbeingofthe loosekindthatdoesnotadheretothecanbody schematic representationV of the thesheetthatistorec'eivethecoathig coatingsfortheinnermostcanbodywalls beeven preferable to the steel strips and wires.

showing also the scheme for the simultaneous treatment of a number of the blanks which might be such of the special linings.

Figure 12 shows dlagrammatically part of the machine and especially the mechanisms that serve for applying the coating of lacquer or of other suitable material to the areasof the large strips that will form the innermost wall of the can body such as diagrammatically illustrated in Figure l1 and including also the automatic mechanism that cuts the long sheet of paper into small sheets; a mechanism for printing on a label or the like to the side of the blanks that will form the outer side of the can. is also shown;

Figure 13 shows diagrammatically the additional mechanism that is necessary when a solid layer of metal is to cover the innermost wall of the can body and if desired also the outermost wall.

Referring more particularly to Figures 1, 2 and 3 the blank I consists'of a single piece cut into a'rectangular shape as shown in Figure 2. The blank itself may consist of a suitable kind of strongly compressed cardboard that does not need to be thicker than one thirty-second of an inch for cansvthat have to hold eatables. I'he first operation that then takes place is the coat'- ing of the area 2 of the blank with a suitable lacquer 3 that later forms the innermost wall of the can body. That area 2 may be covered with a suitable'layer l of solid metal or that area may be covered with .a coating of any equivalent material including resinous. substances etc.

This procedure is preferably done right on the strip that is unwound from the large roll as it is delivered from the mill. Judging from Figure 2 it is therefore only about onehalf of the .whole blank that is thus to be covered with'that layer or coating of lacquer or with solid metal etc. Considering that the width of the whole roll Il as it comes from the mill and shown in Figure 11 permits ve blanks l to be covered at once with the coating of nitro-cellulo lacquer etc.

blanks are cut from the long sheet Ii that is unwound from the roll. 'I'he machine that prints blanks imsinarily laid side by side as exempliiledinFigurellisshowninFigure l2. This area is indicated by the lines to which point the arrows I2, I3, Il and Ii, shown in Figure 1l The same machine may have also the means that automatically cuts the sheet Il in a transverse sense because the single blanks l may not be ready' to be cut right away on account of the lacquer still being sticky. It is, however, possible to cut along the lines II, Il and to let the so-cut sheets dry, that are covered to about o nehalf with lacquer l, until they may be placed in large numbers one upon the other without the danger that they will stick together when they will be compressed. Lots of tlfty or more sheets may then be cut into the single blanks i along the-imaginary lines Il, I9, 2l, 2| and 22 and the single blank will be ready for the next operation. If4 the blanks are to be covered with some different equivalent solution the procedure is similar as exemplified in connection with the nitro cellulose lacquer but when the blanks must be covered in part with a layer of solid metal, such as tin, aluminum etc. there is a dinerent machine needed. Both machines will be described sub- RefeJ'ringagaintoFlgures 1,2and 3andpartlclllarly iin-FigureZ it will be noted that the l'einforcing steel strips 23 are laid on the other half of the same side that is partly covered with lacquer 3. Before these reinforcing strips are laid on `in the desired fashion there is a suitable l packing material 2l of an adhesive character laid on that part of the side of the blank that is left free from the nitro cellulose lacquer 3. Although I do not vwish to limit that material 24 to a single one I specify asphalt as one of the most economical ones that can be employed for that purpose. That layer of asphalt may be mixed with relatively line sand and lmay be applied in hot condition or in a dissolved but thick'sticky condition and this operation may be performed by machinery.` The laying on of the reinforcing strips 23 may also be performed by machinery.

'The reinforcing strips 23 or the wires 25 become so embedded in the packing 24 that it will not be necessary to make a special layer of packing on top thereof. It will not be necessary to place the reinforcing steel strips in great regularity. vAt this stage the blank l is ready to be wound or compressed into the desirable shape. For making a cylindrical can body a mandrel 25 of that shape should be employed and the blank I rolled there- 'on whereby this operation must be started at the out-end which is indicated by I5.A While the blank is laid or wound around the mandrel 26 the inner wall of the body blank isthus obtained uhen the blank is wound up as far as indicated by the dotted line 21. From the imaginary line .'ll towards the left there is still a part 28 left'free from the packing 24 and the reinforcing ste strips 23 or wires 25.A

This part 23 or 'a slice of it may be coated again separately or it might be dipped on with the solution that makes'the nitro cellulose sticky when the blank is rolled up, so that complete separation is obtained between the interior of the can and thel packing 24'. The'cut edge it will also, at the same time, be dipped on with a laceuer of nitro cellulose so that no iibres are exposed to the interior of the can which would draw liquids into. Vthe walls. In order to obtain a iiush outer surface of the can body the mandrei 26 has a recess that starts at the part where the cut end I6 of the blank l is to be engaged by that mandrel as shown in Figure 3.

YThis recess which has the depth of the thickness of the singleblank sheetreaches as far as indicated by 29A where Ait is rounded outwardly and the remainder of the mandrel surface is then of the cylindrical shape. While that mandrel 26 Figure l. The commodity may then befilled in and also the top may be secured in a similar way i as explained ln connection with the bottom.

There may be also the covering means 3|, 32 employed, as also exemplified in my United States Patent No. 2,049,264, and there may be another innovation in connection therewith which consists in folding up the outermost edge part of the covering means so that a part is createdv that lies against the corresponding inner side of the can body Wall 2 and which is partly secured to that inner can body wall with a lacquer of nitro ce1- lulose. This refers especially to the part of that covering means that reaches into the joint and which is then simultaneously compressed with the the latter. For facilitating the removal of that covering' means withoutthe necessity of cutvting it through, either that situated on the top end of the can or that situated on the interior side ofthe bottom, the Dart thereof indicated by 33, 34, respectively, is weakened considerably, that is, it is made much thinner than the remainder of that covering means, so thatit` will detachitself easily at that part when the center part is gripped with the lingers and pulled outside of the can when the top t (or bottom) is removed or cut open.

Besides the nitro-cellulose which /makes the border part of that covering means adhere to the can body wall, especially where `the joint is formed, there is also another packing material employed for making the bottom' piece (o'r the top piece) adhere to the corresponding part of the covering means that forms part of the joint. There are various materials employable for that last mentioned packing and one of the most economical is asphalt which m-ay be applied in hot water, steam, moisture and acid proof while the continues in winding up the blank I there will be included the packingj24 and the reinforcing strips 23 or the wires 25 or the dried vegetable matter which will then be situated between the inner and the outer wall of the can body.

From Figure 3 it can be seen that the blank l makes a sharp outward bend at the point indicated by 30 and that the end l1 of that blank lies against that ,bend and that therethrough a perfect cylindrical outer surface of the can body is obtained. This is not only necessary for obtaining a harmonic exterior but lt is important for permitting a perfect closure with the bottom and top piece. For increasing the hold of the bottom t and of the top 6 on the can body the top and bottom edges 1 and 8, respectively, of that can body, are either thickened o r the corresponding part of the outermost convolution of cardboard or paper is bent somewhat outwardly nitro-celluloseon the covering means makes it also grease and oil proof. There may be a fur.

ther innovation in connection with the 'covering means and it consists of coating (imprinting) the whole side either the interior side or the exterior side or both of that covering means with a layer of nitro-cellulose lacquer or with a layer of solid metal or with other materials dependent upon the character of the contents. If the latter are, for instance, of an oily or greasy character a solution of a resinous substance may suice.

Preservespsuch as eatables necessitate coatings that will not be dissolved by these preserves and Athese coatings should not have a disagreeable A smell nor taste. v

This isone of the reasons why a lacquer of -.nitro-cellulose would be preferable to many others and it hasthe advantage to lay on the surface of the paper without impregnatlng the latter which, however, is the; case with most of other kinds, especially those that are soluble with turpentine.

By leaving then the part 33, 34 only slightly covered with the lacquer that is to constitute the part on which the covering means is to detach itself, as mentioned before, that part would then-be weakened thereby. That weakened part could only be impregnated to prevent access' of fungus etc. and besides it may be folded upon the part that'adjoins the can body wall as shown in Figure 1 and an adhesive placed in that short as shown in Figure l. The bottom is then suit-4r ably compressedl on the lower end portion of the can body whereby a Joint is obtained as shown in folded part that simply holds the folded sections less thickly u (ses strip u mamma by dotted unes). The

adhesive in the folded part 33. 34 may consist ofy interior or exterior side of the covering means 3|,

32, no coating .will then be necessary on the inner side of the top 3 and bottom 5 which, however. would be necessary'if the covering means would be left out completely, or if the latter was not covered by a layer of lacquer or of solid metal etc. 5

If the can is to receive an angular shape such as of a cubic form or one with a rectangular, octaonal etc. sectional conformation or one that is of an oval sectional conformation, it is advantageous to make the cylindrical shape nrst audtocoxnpressthefinalshapebytheuseof mandrels or forms that possess the shape whi the can body is to receive.

For obtaining a close fitting of the top and.

bottom that portion of the overlapping part on the section 2 of the blank I, that would hinder the top and bottom from being put on closely, may be cut out. as it is-exemplifled in Figure 2 by the cut out sections `45, 41 on the right side end corners of the blank I. 'Ihis scheme might apply also to such cans in which more than one body blanks are used, as for instance. with the can shown in section in Figure 8.

If not a special label is to be put around the can body there could be printed onl in one or even more colors, the label or other indicia. that usually is customary with such containers or cans. and the printing operation could be performed before the particular part of the sheet II (see Figure 12) reaches the drum or cylinder 43 which applies the inner coating to the areas on the long sheet II that are limited by the borders I2. I3, I4 and I5 thereof.

Referring to the modification of Figure 8 that structure requires two blanks of which one, indicated by 31. constitutes the inner wall of the can body and the other, 33, the outer wall, and between these two walls is placed the packing y24 and the reinforcing steel strips 23 or the wires 25.

'I'he ends of the inner wall blank 3Imay overlap, as shown at 3l. and so may also the ends of the outer wall blanks. l 'Ihe ends of the blanks the blank-ends do not overlap a better closure4 can be expected with. the top and bottom. The arrangement may be made so that the meeting edges of the inner blank would be situated onV a diiferentpart of the can body than the meeting edges of the outer blank and therefore the side Seam or meeting edges of the inner blank may be situated on the opposite side of the meeting edges of the outer blank, such as Nexemplified in the drawings.

It is apparent that-the scheme for coating the surface of the inner blank of 'the can, that is shown in section in Figure 8, must not diifer from thatdescrihed in connection with Figures 1, 2 and 3.` The inner blanksof the can of Figure 8 would then simply be separated yfrom those 7 asomo lacquered or iiot lacquered parts 33,

parts of the sheets that are not covered with the coating of lacquer or of a solid metal or of any suitable material.

m case um the bunks l. n and u for can body are of an inferior material that is too porous for permitting the. coating of them with a single layer of lacquer or of another of the mentioned materials it is then necessary to use a liner 4I or 42 of a suitable paper which-will then be coated with the lacquer of nitro-cellulose or with solid metal or with anyl other of the materials suitable to the contents.

This liner, which is shown in section in Figures 9 and l0. may be secured again to the innermost wall of the blank I or 31 by means of a suitable'adhesive binder, and such scheme is il lustrated in Figure 9 in which the last mentioned binder is indicated by 43. The liner is then indicated by 4I and consists of a suitable kind of paper which might or might not be impregnated, or which'might, or might not be of the type known as sulflte paper or parchment paper. The coating of its interior side is-indicated by 45.

The inner liner may, however, not be secured to the inner wall of the blank I or 31, as shown in Figure l0, and in this instance the loose liner is indicated by 42. The latter should, however, at least, be suiliciently secured in the joints, together with the covering means, should the latter also be employed, and the ends of the liner, that are to form the side seam thereof, should overlap and should be secured to each other by means of nitro-cellulose lacquer and then compressed. The coating of the liners 4I and 42 is also performed by machinery and in the method exemplified in Figure l2 whereby, however, the whole underside of the sheet will be covered by the lacquer o r by the solid metal etc. whereby the printing operation will be eliminated which is simply obtained byI letting the sheet pass at a little lower level than the level at which the sheet Il ,moves and at the same time it will be necessary to stop the cylinders that constitute the printing mechanism of the machine. It necessitates, however, the change of the cylinder 40 for another cylinder that would have a correct and complete cylindrical shape.

Although the specic construction of the machines that are used for making the cans and containers which includes also the applying of thel various coatings will be claimed in a special patent `application that will be filed somewhat later than the present one, a brief description of the main parts of this machine will greatly help to comprehend the invention.

In Figure 12, the roll of paper is indicated by I5, II is the unwound sheet from that roll 5l indicates the cylinderl that has a rubber blanket secured thereto upon which the black or color impression is made by the cylinder 5I, 52 is the roller for rolling ink on the cylinder 5I. 53 is a cylindrical body for evening and spreading the ink on the slab 54 and ,for providing the roller 52 with a certainamount of ink. 551s a cylinder for exerting counterpressure to the cylinder 55 and thereby cause the impression4 on top of the unwound sheet II. 55 and 51 are displaceable rollers for keeping the unwound sheet at a lower level shbuld no printing take' place which is the case when the inner lining 4I or 42 is to be covered with the coat of nitro-cellulose etc. in which case the roll I0 of card board must then be substituted by a roll of paper whose quality and thickness suits bestl for the lining 4| or 42.

" accordingly each may serve for indicating the particular commodity that is to be contained in the can. There may be, however, far more than five blanks or less than five obtainable from the area that is limited by the boarders of the sheet II and the eut edges i8, I1, all dependent yupon the width of the sheet II.

The function of applying the lacquer or other coating, with the exception of the metallic coating, is performed by the drum 40; This drum is v vnot of a perfect cylindrical design because it has the protuberances 58 which are so positioned on the cylindrical' surface of that drum, that the moving sheet II will be heavily contacted oyy them, that is, imprinted, while the drum is also revolved in the` sense indicated by the Yarrow 59. Each protuberance 58 has therefore. a curved surface of the size that equals that of the area that is limited by the lines I2, I3, Il 'and I5 as indicated in Figure 1l. Each of these protuberances must also be correctly dlstanced from each other and must correspond otherwise with the cends and cuts the sheet II along the imaginary line I6 in the fashion of a shear. The other shear blade 18 may be'statlonary.

The knife S9 may be actuated by a mechanism that comprises a lever 1| that is so positioned that it will be engaged'by the'front edge of the protuberance 58 that encounters it and it will be pushed sufliciently thereby so as to actuate a rod 12 which in turn moves the lever 13 to which the rod 12 is pivoted. 'I'he lever 13, being secured to a dentated wheel 14 which is mounted on a shaft, causes that dentated Wheel to partly rotate on that shaft, and since that dentated "wheel meshes with the teeth of the rack l5, to

which the knife 69 is secured, the latter, together with the rack 15, is thereby moved upward, and the blade of the knife-69 comes thereby into engagement with the blade 10 every time in which the frontal edge of any of the'protuberances 58 engages the lever 1|. By taking the correct dis-v tance from the front edge of one of the protuberances 58 to. the front edge o`f the next one yand by adding that distance one or several times to the sheet I'I starting at the point `where the lever 1I will be first engaged by the'front edge of any one of the protuberances 58 the correct place will be found thereby on which the knife 69 must cut the sheet.

- I According to the sizes of the cans the drum lillv must vary and so must also vary the distance on which the knife 69 has tocut the sheet II. The

rod 12 and other parts of that mechanism must,

positions of the areas that must be covered by the coatings on the unwound sheet II. For exerting a certain counter pressure to the protuberances 5d, in order to obtain a good contact of the sheet li with them, there is a cylinder 80 eniployed that is sustained by springs 5i that bear against the bearings of that cylinder. The cylinder tt, not being very heavy, is then lifted a little against the tension oi' the spring 6I every time one of'the protiiberances 58 engages the sheet Il underneath that cylinder G0. Underneath the drum .de there is a moistener arranged that consists of a rubber or the like broad belt 62 whose lowermost ,part is immersed in a tank 63 that contains the dissolved lacquer or other liquid that serves for making the coating 3 on the sheet il, or t5 on the linings 42, 43.

The innermost surface of that belt 62 may be dentated to permit a dentated wheel Btl to mesh with the teeth on the inner side of that belt and to keep the latter in continuous movement so that lacquer or other liquid will be continuously brought from the tank Sii to the uppermost part of the belt 62 and thus be transferred to the surfaces of the protuberances 58 which latter therefore be adjustable to any size of cans.V it' is therefore advisable to make the rod 'l2 sufliciently long and to provide a screw to thepivot l5 for permitting the securing oi the latter to any part of the rod 12.

The weight of the rack 15 causes' the latter together with the knife 69 to descend as soon as the protuberance -58 that pushed the lever il does not hinder the latter anymore from moving again in the path of the front edge of the next following protuberance 58. The falling single cut sheets are caught by a. pair of arms l1 which hold each sheet so that it turns over and then lays on a moving rack 18 that goes in the direction of the arrow 19. The single sheets may be -laid out and allowed to dry before they are cut into the single blanks l or before any printing ismade to the back thereof which will then be later the outer side of the can, should the'printing not have been done before;

`If the innermost side oi the can shall receive a coating of solid metal then the procedure needs imprintit again to the sheet II. The .dentated 'wheel 6ft is therefore so arranged that it will hold the belt 82 in the proper position for engagement with'the protuberances 58. The outer surface of the belt 82 may be made porous or it may be simply'roughened somewhat to permit better adherence of the lacquer' or other liquid to that surface.

The sheet II,1 after having received its impressions f lacquer, etc., reaches the cylinders or rollers `55, 56 which serve for holding the sheet Il only'on its two outer marginal spaces 61, 68

(see Figure l1). The still wet coating on the sheet II will therefore not be touched by these rollers. Right after having passed between the cylinders or rollers 55, 88 the sheet II may be cut into single sheets by means of the knife 59 which is' so adjusted by mechanism that itrassome additional machinery and 'the uncutlsheet I Lwill be directed towards those additional parts. The direction which the sheet will then talle is indicated by the dotted line 88 and in Figure i3 are shown, in a diagrammatic Way, the additional main parts of the machine.

If the innermost Wall ofthe ceive a solid' layer of metal the rst coating of that area may consist of-varnish instead of lacn1 quer. The sheet strip II is then directed to-s y wards the cylinder 8| that has a suitable soft dry cloth- 82 wound around the cylindrical surface of that cylinder and that dry cloth 82 takes up powdered-metal, the so-,called bronze, that is contained in the trough 33. The bronze that sticks to that dry cloth 82 will readily be transferred to the varnished o r lacquered areas on the sheet I I, while thatsheet is moved along and the cylinder 8| revolves. 84 employed that acts as a duster for removing the surplus bronze that sticks yto the sheet II.

blank I is re- Thereis another cylinder y and the cloth I that is wound around its cylindriealsurfacewillbeshakentreefromthe bronze that adheres' to it when itwill be engaged by the sticks Ii that are so agitated that they will continuously hit that cloth. l

Boththebronzingimitandthedusngunit may be suiiiciently encased for preventing the bronzefromoangintheairandsettlingon othersurfaeesofthesheet II. A The next cylinder which engages the sheet I`I islndicatedbytlandservesforiiuxingthe areas that are varnished and then powdered with bronze. Theiiuxiscontainedinthetroughll, and while the cylinder 8'! revolves its cylindrical surfacewillbemoistmedbytheilux, thatisof the dissolved kind, and the under surface ofthe sheet il willthusbewetiedtherewith. The bronaed areas on thesheet Il, that are thus iluxed, are then-ready to be covered by a. thin layer of solid metal. The latter may be tin or aluminum when it deals with eatables while other metals may be employed for other commodities. l

The molten metal is contained in the trough Sl of graphite and is kept there iluent by the heat applied through the llame SI. The drum l2,whichmaybeofthesameshapeasthedrum ll and therefore may have also prohlberances $3, is so adjusted that the protuberances will dip into the molten metal container in the trol-18h 9| and while the drum revolves thel protuberancessuccessively apply the relatively thin layer of metal, that sticks then to the surfaces of these prohxberances, to the bronzed and iluxed areas on the sheet Il while that sheet isl moved along.

After the molten metal is applied to the sheet Il the latter may be cut into the single sheets bymeansofthesameorbyasimilarmechanism that has been described previously and which I includes the parts indicated by Il to 1S, inclusive. Obviously, also the cylinders Il, Il and Il may be of the same general construction as the drum 92 and the pro on these cylinders ordrumsmustbesoadjrtedastobronzathat is, apply the powdered metal, dust and ilux, respective1y,onlytheareasonthesheet II that receivedtheimprintwithvm'nishorlacquerby the protuberances on vthe drum Il.

The ihst cut sheets which are those that still contain live single blanks, as shown in Figure 11, maybeprintedonon thoseparof the back thereofthatwillformtheoutersideofthecanbody, should the prhiting operation not have been performed previously. The single blanks I may then becutfromthatsheetandeachblankwill then bereadyforbeingrolledintothecanbodyas previously explained.

It might be desirable to have also a metallic coating on the outer side of the can body for practical. as well, as, decorative purposes and that coating would not need to be of a metal that, like the one used `for the innermost side, is of a non-detrimental character to the contents and therefore to the health of the consumer. It

is, as well, not necessary to make that coating of solid metal. It might, for instance, be of a highly decorative eiect to cover-the outer side of the' can body with bronze, either withV so-called silver or gold bronze, and to embossor add solid metal in formof a suitable design, lettering etc., on

top of the ilat bronze, layer whereby that solid metal may be of a different metal than the bronze, for obtaining contrasty effects. That part of the machine is also shown, in a diagrammatic way, with the larger cylinder or drums, shown only in fraction. The drum $5 would then serve for imprinting the varnish on the area of the sheet I I that will be the outermost side of the can body. In construction it will be like the drum Il and besides having a trough, similar to that indicated by $3, there may be addltkmal parts used in connection therewith, as, for in- 10 stance, a belt and an additional dentated wheel like those indicated by 62, il, respectively.

The drum Si may then serve for powder-ing the varnished areas with the chosen bronze, whereby those parts will be left free from the bronze that are not varnished. The bronzing drum I6 has therefore also similar protuberances as the drum $5. The dusting wheel or cylinder l1, that is the next that engages the mentioned area of the sheet Il, may' be completely cylindrical and so maybethedrumil thatservesforllux'lngthe bronsed parts. This dmm, however, may have also protuberances, so that only the varnished and bronzed areas will receive a slight coating Inmany instances it is preferable to use other Y materials than those of metal for the reinforcing parts in the can body wall. 'I'he most adaptable would be those of a fibrous character which includes grasses and weeds of many specimens of which the whole plant could be takenwith the exception of the roots and then compreed and dried. There might, however, only be used the fibres of the stems and branches while the leaves will be discarded. Jute libres would, i'or instance, be very useful. The libres or dried grasses etc. might be laid on the packing in the manner that was disclosed in connection with the steel strips 23 and wires 2i, as shown in Figures 2, 4, 5, 6 and 7, and thebres or etc. could be ma'de into small blmdles and cut to the correct size.

- Some of the domestic plants or fibres that are abundant and which can be used for the aforesaidpurposearestramseagrasandprairie grass, theflbresofragweedandofotherweeds, that usually have no other usefulness nor beauii\ tying properties. In dried condition and surrounded by the packing, these plants or bres thereofpreser'vetheirtoughcharacterandaddA greatly in strengthening the can body wall.

A can made of the materials mentioned willl not rust and is alsoin thisrespect cans made of sheet metal. Y

If the can or container blank I or 3l will not be printed on, so that a special label will be put around the container body when the can or container is completely finished and the eatables or other commodity is filled in, the outer surfaces of that can or container should be made nonimpregnable. especially to moisture.' water, steam and other influences, especially of the atmospheric air. The lled in and closed can might then be covered with paint or lacquer and in this instance it simply might be dipped in the liquid superior to aaaoac paint or lacquer etc. and the surplusksticking to it. allowed to drain oil', whereby the label may be ailixed while the paint or lacquer is not com-- pletely dry so that the label will stick to the the so obtained fairly thick solution to the outer side of the can body. The so obtained coating is of a deepblack with high lustre when dry, which adds to the good'outer appearance of the can or container and which is at the same time water, moisture steam and acid repellent.

It is also contemplated to use themetallic strips or wires simultaneously with libres whereby a specially strong and resistant can or container body wall will be obtained thereby.

What is claimed is:

1. In a sanitary preserving can or container constituted in part by a can body with innerand outer walls that consist of a material in blank form thatis woundupinto the can body, the innermost side of that can body imprinted with'a coating of material that is adapted to preserve theV contents from fungus and other influences from the non-sterilized air, and all the other parts of that can or container that form part'of the innermost side thereof also imprinted with the same material that coats the innermost side of the wall of the can body, and a packing between said inner and outer walls of the can body having metallic narrow parts and dried vegetable matter embedded therein for reinforcing Apur-- poses.

2. In -a sanitary preserving can or container constituted in part by a can body with inner and 3. In a sanitary preservingcan or container consisting 'of a can body, top and bottom, the. can body constituted by fibrous blank material with packing and reinforcing steel strips or wires, the inner side o`f that can body coated with a layer of lacquer of nitro-cellulose and that lacquer applied to said fibrous blank material' before n the fibrous blank material is formed into the can 4. sealed sanitary preserving can or container consisting of the can body, the top and the bottom and all constituted in part of fibrous material, the can body consisting in part of wound up fibrous sheets, a material, tastelessand odorless when dry, forming the innermost surv face of the can or container and being directly contacted by the contents thereof,said material adapted to protect the contents from outside iniluences, such as fungus, water, air,'oil grease, steam, 4moisture and acids, said material applied to the innermost side of the innermostsituated fibrous material of the can body, top and bottom while this fibrous material is still-in sheet form and before the forming of the can or container, for' permitting close inspection of the coated parts and the eventual recoating of flaws.

5. A sealed sanitary. preserving can or con-A tainer consisting of the can body, the top and the bottom' and all constituted in partof fibrous mterial, the can body consisting impart of woundy the can or container and being directly contacted outer walls madel from fibrous material, both the..

inner and outer walls' formed by a single blank that iswound into said can body, the area forming the innermost side of that can body imprinted with a layer of airwater, oil and grease proof material that is applied to said blank before its formation into the `can body thus permitting close v'and easy inspection of the coating before the can body'is finished.

' land the correcting of them before the can or' by the contents thereof, said material adapted to protect the contents from outside influences, such as,.fungus, water, air, oil, grease steam, lmoisture and acids, said material printed to oneside Aof the iibrous material while the-'latter is still in sheet form and the printed on side forming the innermost side of the can body, top and bottom, when the can or container will be formed, thus permitting close inspection of the imprinted parts container is assembled and formed.

HEINRICH KARL.

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