US2109749A - Moistureproofing - Google Patents

Description

- March 1 193s. F, R Moco@ ,2,109,749 MOISTUREBR'OOFING Original Filed Nov. 7, 1933 5 'Sheets-Sheet l v l ATTORNEY.

,BY www March l, 1938. F. P. MccoLL MoIsTUREPRooFING original Filed Nov. 7, 193s 5 sheets-sheet 2 Fmwlislz/v/ Ccou A SM.

March 1, F, P MgCOLL I MOISTUREPROOFING Original Filed Nov. 7, 1933 5 Sheets-Sheet 3' l i i 70 I INVENTOR.

W/MQSPWZJCOM ATTORNEY.

Patented Mar. l, 1938 UNITED STATES MOISTUREPROOFIN G Francis P. McColl, St. Andrews, New- Brunswick, Canada; Mary` Pamelia McColl executnx of. said Francis P. McColl, deceased Original application November 7, 1933, Serial No; 697,011. Divided and this application December 3, 1934, Serial No.

7 Claims.

My invention relates to improvements in laminating or coating paper, card, or other material, or containers of the same by cellulose or other substantially moisture-proofl materials, preferably transparent, and has `especially to do with, an'd is illustrated in the accompanying drawings in its application to the moisture-proofing and formation of containers such as paper' cans, and

more particularly, has reference' to means for l', laminating sheets of material for lining, and `covering in some instances, the exterior as well as the interior of such container, thus providing an inner or outer covering, coating or laminating of substantially non-porous, and preferably I3 transparent material, and in some instances, .the container is provided between the body of the container and the covering with a sheet of material such as paper, sometimes colored, producing the effect of enameling, and involves the seal- :fl ing, fusing, or hermetical binding of the walls of the container and laminations where the same join, such as at the seams or laps, thus in most instances forming a complete unitary, substan- Figure 4 illustrates in perspective an arrange-- ment of body material, label and linings for straight Winding;

Figure 5 is a perspective view of the body of a can made with a composite strip arranged substantially as shown in Figure 4;

Figure 6 illustrates in plan view a built-up or composite strip for forming into the cylinder -5 body portion of a container;

Figure 7 is a sectional View through one end portion of a cylindrical vessel lined and covered as per the present invention.

Figure 8 is a sectional view through one of the thereto.

' Figure 9 is a sectional view illustrating the initial association of the, container of Figure 7 and the head of Figure 8.

Figure 10 is a similar view illustrating the head locked in place.

Figure 11 is an edge view of a preformed strip going into the making of the container of Figure 7; and

60 Figure 12 is a plan view of a blank illustrating heads of such container before application` (Cl. 22S-3.5)

the manner of formation ofthe preformed strip of Figure 11. I

Referring now more particularly to Figure 1, the same illustrates rolls 6 and 1, of very thin cellulose or other suitable non-porous, preferably transparent materal, and 8 indicates a similar roll of paper stock or card to be laminated or covered with the transparent, non-porous material, 9, I0, indicate troughs lof methol cellosolve, a solvent for the cellulose, containing rosin, gum, acetate," and sometimes other ingredients, which may be used as a solvent, cement or adhesive for sticking or fastening the cellulose sheet to the card or board, and to itself Where the same overlaps. Such a solution may be made up as follows: heavy acetate, 75 parts and methol cellcsolve 50 parts, to which may be added 5 parts of Igum or 73 parts of acetate may be used to 10 parts of a suitable gum with parts methol cellosolve. In any case, the adhesive or binder preferably is such that it has some dissolving effect so that the margin of the cellulose where overlapped is actually united, bonded and lhermetically attached; thus forming an integral or continuouspiece, while at the same time it serves as a filler and an adhesive.

II, I2 indicate rollers upon shafts I3, I4 adapted to rotate Within the troughs A9, I0, and in the solution referred to, said solution being indicated by the reference characters I5, I 6 and I'I, I8 lndicate rollers similarly mounted and contacting with the partially immersed rollers II, i2, as shown, to pick up and take the adhesive, and pass it to the under-surface of the strips or webs of cellulose, I9, 20, as the same pass over theV paper 23, and that the inne'r margins of the cellulose strips at opposite faces of the card overlap (with the cardor board between) as shown' at Figure 2, while the outer margins rthereof at opposite faces and opposite sides of the card o1' 'board extend beyond the board or card. Y

Referring now again to Figure 1, I have ind'- cated at 24, a suitable folder or seamer of any desirable shape such as is wellz-known in the paper foldingy arts, so that as the composite strip 25 feeds through the same with the marginal portion'l and 20 of cellulose extending, said roll 33, which may now be used for forming cylindrical containers such as paper cans, and, of course it will be readily understood that tinplate or other material may be used instead of card or paper, if desired.

When a tapered container is desired, a blank is cut and formed, substantially as shown in Figure 3, instead of having straight parallel sides as' v shown in Figure 2. Such a container is formed by rolling one end of the blank shown in Figure 3 within the other, until the lateral margins overlap, whereupon the inner and outer walls of the cone thus formed will be found to be entirely covered with the transparent material, and the overlapping margins may then be cemented or bonded together, thus forming a tapered or cone-like tube, having a substantially continuous inner and outer wall or lamination of substantially water-proof and transparent material.

As an adhesive, I may dissolve rosin in dibutylphthylate or, I may use ester gum in place of the rosin,-about seventy-live partsof the gum to about twenty-five parts dibutylphthylate, which can be thinned by heating.

Referring now more particularly to Figures '1 to 12 inclusive, it will be observed, especially by reference to the latter figure, that a long strip of card 65 may be prepared in a manner similar to Figures l and 2 with a piece of cellulose 66 at one side upon the under face, with an extending marginal portion 61 as shown, and at the opposite side of the strip of card 65 may be provided a strip of labels 68 on the upper face with extending margin 69. This composite sheet may be cut along the line '10, according to the height of the can or container to be made, so that each strip for each container contains the moisture-proof strip 66, 61, which is rolled inside the coil, and the label 68, 69, on the opposite side and opposite face of the strip, forms the outside of the coiled cylinder or body portion of the container to be formed. The free margin 61 is fused to the opposite end 66 by overlapping the same thereupon, and the free end 69 of the label 68 is overlapped upon itself and fastened thereto by suitable adhesion after the wall of the container has been formed. The paper or card may be of any suitable cheap grade of material suicient for the necessary body and strength of the container, thus forming a cylinder having a non-porous lining with an outer label and, if desired, a piece of colored paper may `be laminated between the non-porous strip 66, 61

and the paper 65 to show color therethrough, giving in effect an enameled appearance for the interior of the container, while at the same time minimizing the amount of-absorption by the surface to which the lm is fastened. Also, it will bev readily understood, that the label 68, 69 may be covered with a suitable lm of non-porous and transparentmaterial, thus protecting the printing thereon and producing an outer highly polished surface, much superior to ordinary highclass labels. The strips for forming successive cylinders of predetermined length, cut from the composite strip along the line 10, may be supplied in bundles and successively fed to the forming mandrel of the tubeQmakin'g machine, or

may be fed from the continuous strip and cut off as required for forming into cylinders.

f The'form of cylinder shown in Figure 7 is provided with a suitable inner lining 1|, and an outer label or covering 12, the intervening body of the wall being indicated at 13. A suitable head, covering or end for this container is illustrated in Figure 8, the same being preferably formed of metal such as tin, having an upwardly domed central portion 14, with side wall 15, and base flange 16, preferably terminating in a peripheral inwardly turned portion 11. 18 indicates a disc of non-porous material, and the outer diameter of the Wall 15 is very slightly greater than the internal diameter of the body shown in Figure 7, so that as the head and body portion are pressed together, the lower, inner I edge 19 of the wall strikes the rounded shoulder 88 of the head or end, carrying the margin of the disc 18 down tightly, squeezing the same against the wall 15, and a suitable solvent having been first applied to the upper marginal surface of the disc 18, or base ofthe lining 1| and inner wall 13, causes the fusion of the margin of the disc 18 and lining 1| entirely around the container, the same being now in the position shown in rFigure 9. The next operation brings the re. maining portion of the moistened base flange 16 upwardly, andthe peripheral portion 11 is now forced against the outer wall of the container, while at the same time, the wall 15 is now preferably pressed outwardly at the shoulder 80, as indicated at 8|, thus slightly restricting the container wall at that point, while the inturned portion 11 further restricts it adjacent the same point, thus interlocking the wall of the container to the head, making a secure, immovable fastening, while at the same time providing a continuous, integral, inner lining of non-porous material within the outer body portion of the card of other material, it being understood that a head or end similar to that shown is, of course, applied at the opposite end of the body portion. A removable cap without the restricting elements 11 and 8| may also be so formed, and may be sealed to the container by applying solvent between adjacent faces of the cap lining at 18 and wall lining at 1|. It has been found that this method of moisture-proofing a container is much more economical and certainthan by spraying the interior of the container with the non-porous material in vliquid eform,--first, for the reason that morenonporous material would have'to be used as a solution, and the same being usually volatile, further head joins the body portion, and necessitates aI pre-treatment such as with solvent or sealing agent-at that point between the head lining and the wall lining, whereas, when laminating or covering with pre-formed sheet material, an extremely thin web or lm of material may be used, even as thin as a half thousandth of an inch, and being uniformly and thoroughly fastened to the inside of the container. has all of the necessary strength and impervious qualities, while at the same time providing a much superior finish and appearance, also lending itself to underlaid sheets, much as for coloring vand enameling effects.

In some instances, such as for tobacco or cigar cans, the impervious film may be placed over the label only on the outside of the container, instead of on the inside, and in that'case, the inside may be lined with a softer material, such as rough paper, which may be previously soaked in tobacco juice, and the container may be formed while this soft lining ismoist with the tobacco juice, so that when the cigars are inserted, and the container is sealed closed,` it serves as a humidifler, sealing the moist air within the container until such time as it is opened. In such case, the impervious coverings applied to the heads or ends of the container would still preferably be on the inside thereof as described, especially where the same are formed of tin, for the purpose of preserving the same from the rusting Aeffect of the moisture, though-of course the heads may also be covered externally to form a complete external impervious covering or coating.

'I'he solvent is preferably in fact also a illler".

That is to say, I have found that by using a solvent or adhesive which has also a filler combined therewith, that the moisture-proof properties of the covering or lining are improved, probably for the reason that the cellulose is what might -be termed cellular or porous under a miscroscope, and the filler by filling in the pores or cells of the sheet close them while the solvent fuses the sheet together, or fastens them whensome other adhesive is used, the filler being forced into the cells or spaces by the pressure of the rollers during the laminating operation.

In the modicatlon shown in Figures 4 and 5,

the can is shown made of a direct or straight convolute winding, in which case a strip of film 88 is provided of a sufiicient length to pass completely around the interior of the can to be made, a marginal portion 88 overlapping and fusing to the margin 88, so as to form a complete unitary integral lining or cylinder. To the opposite side of the lm 88 is suitably secured an underlining of paper 8| which may be white or, any other color and, showing through the film 88 produces an interior enameled effect. This lining paper 8| is backed by filler or card 82. the lining paper and card being of sufficient length according to the number of turns or convolutions intended for the wall of the container. At the outer end or margin 82' of the paper and board strip of label 88 is secured as shown, and at the opposite side a film strip as indicated at 84, so that after the paper and board 8|, 82 have been wound, the same is followed by the label 88 covered by the nlm 84, the end margin 88 of which overlaps the margin at the opposite end, thus pro-` viding a container wall or cylinder laminated inside and out with film beneath the inner surface of which is a white or colored paper, and between which and the outer. laminated label is provided the board nller.

By reference particularly to Figure 4, it will be observed that when the cylinder wall is rolled in straight convolute manner, the margins 88, 8l'

of the foregoing outer tllm will extend above and below the ends of the body of the can. By now moistening the inside of these margins, and turning them inwardly over the top and bottom edges of the can, before pressing a head or heads into the can ends, the top and bottom edges of the can'will be covered or sealed, and will not absorb moisture, and the inner and outer film covering of the can will be joined or fused together. i

In thelmodillcation shown in Figure 6, a composite or laminated strip suitable for straight winding upon a mandrel is shown with parts broken away. |85 indicates the inner lining or film portion, |86 a colored paper thereunder, |81 the board or other body material, |88 the label, and |88 the outer lamination of film with margin |l|8 for sealing thereto. l

Containers made as thus described are preferably lled invertedly, that is, from the bottom, after which the bottom may be readily headed or seamed with a suitable end of paper or metal of either the type seen at 14 or any of the wellknown types, as may be desired.

What is claimed as new and is desired to be secured by Letters Patent of the United States is:

1. A paper receptacle having a rolled body portion, the blank of which consists of a strip of body forming paper, a section of moistureproof lining paper secured atwise upon one surface of said body paper adjacent to one side edge.

-jecting beyond the relatively opposite side there- 3. A blank for a rolled paper receptacle as set forth in claim 2, wherein the projecting portions of the lining and wrapper papers extend in relatively opposite directions around, andere secured over, the opposite side edges of the body kpallier- 4. A blank for a rolled paper receptacle rset forth in claim 2, wherein a colored opaque paper is secured between the lining paper and the body paper, and wherein the lining paper is transparent. I

5. A blank for a rolledpa'per receptacle as set forth in claim 2, wherein the colored opaque paper extends entirely across the respective surface of the body paper.

6. A blank for a rolled paper receptacle as set forth in claim 2, wherein a transparent protecting sheet is secured flatwise over the obverse face of the wrapper paper.

'1. A blank for a rolled paper receptacle as set forth in claim 2, wherein a transparent sheet is secured flatwise to cover the obverse face of the wrapper paper and projects at three sides therebeyond.

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