US2874831A

US2874831A - Paper rolls and method of making

Info

Publication number: US2874831A
Application number: US431106A
Authority: US
Inventors: Thomas E Flanagan
Original assignee: Kalamazoo Vegetable Parchment Co
Current assignee: Kalamazoo Vegetable Parchment Co
Priority date: 1954-05-20
Filing date: 1954-05-20
Publication date: 1959-02-24
Anticipated expiration: 1976-02-24

Description

Feb. 24, 1959 Y f. E. FLANAGAN 2,874,831

PAPER ROLLS AND METHOD OF MAKING Filed May 20. 1954 i j INVENTOR.

7 TAO/220: E ficmaya/y W/KM 6M United States Patent "ice Application May 20, 1954,. Serial No. 431,1 6

3 Claims. 011205-59 This invention relates to improvements in paper rolls and method ofmaking. 4' 1 r The main objectsof thisiinventionare:

First, toprovide a waxedpaperirollicapableaof retaining moisture contents of the paper under varying conditions of surrounding humidity.

Second, to provide a mm" so'f' moisture iresis tan't coated paper which eitectiyely' etainsithe moisturecontent of the paper and at the same time permits the paper being readily unrolled.

Third, to provide a; rollofmoisturefresistant'*coated paper having cut or uncoated' end "edgesih 'which 'ithe edges are effectively sealed to prevent'theescape of 'moisture therethrough, which may be economically produced and permits the use of the paper as desired, the edges of the unused portion remaining effectively sealed.

Objects relating to details and economies of the invention will appear from the description to follow. The invention is defined and pointed out in the claims.

A preferred embodiment of the invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a fragmentary side elevational view of a roll of paperembodying my invention partially in longitudinal section.

Fig. 2 is an end elevation thereof illustrating the unrolling of the paper.

Fig. 3 is an enlarged fragmentary view illustrating the web of paper and the coating on the sides thereof.

Fig. 4 is an enlarged fragmentary view illustrating the roll of paper with the uncoated or cut edge thereof prior to the application of the end coating to the roll.

Paper provided with moisture resistant waxed coating or coatings of other moisture resistant materials are widely used for various purposes, particularly as wrapping paper. Such paper is subjected to various degrees of humidity and commonly to such low humidity that the moisture content of the paper escapes or evaporates from the uncoated edges of the paper, thereby rendering the paper less pliable and convenient to use.

Waxed paper and paper coated with other water resisting coatings is extensively merehandised in the form of rolls of the type illustrated in the accompanying drawing in which the web of paper 1 is convolutely wound into a roll upon a core 2. For economy of manufacture, webs of paper are of considerable width, commonly several feet in width, while the commercially used rolls of paper are of varying width and several rolls are formed from the single width of web so that a web of paper as it is produced is wound into a single roll and then cut into roll sections of the desired length. The means for cutting the first formed roll of paper into sections are not illustrated or described as suitable means are well known in the art.

Frequently the commercial rolls are relatively short. In any case, the moisture of the paper evaporates or escapes from the cut edges quite rapidly. To prevent such escape, the applicant coats the ends of the convolutely wound rolls of paper, designated generally by the numeral 3, with a moisture resistant coating 4, this coating cover- 2,874,831 Patented-Feb. 24,1959

, 2 ing the entire ends of the convolutely wound paper and is radially continuous. 7 1

In Fig. 3 the paper web 5 is conventionally shown with a coating 6 on both sides thereof, the coating-most commonly used being a parafiin wax coating. InFigs. 3 and 4 the cut or raw edges ofthe paper are shown at 7. Where the coating 6 is of parafiin wax, the end coating 4 is also desirably of parafiin-wax but having a melting point substantially-lower than the melting point of the coating for the sides of the'web. This allows the coating 4-tobe applied in a melted state and it may be applied with a brush after the rolls are cut into sections without forming a fusing bond with the coating of the paper so that the web of coated paper may be readily unwound. There is no bonding adherence of one convolution ofthe paper with another and the paper is not disfigured atits edges.

Where paraifin wax is used, wax commercially designated as crude scale wax or slack wax may be used; however, semirefined paraffin or even fully refined paraifin which at its melting point is substantially lower than that of the coating for the paper may alsobe used. While there may be some adherence of the end coating wax to the edges of the web of paper, that is, some of the end coating may peel or flake off with the web as it is unrolled, that is not objectionable to the ordinary use of the waxed paper. i

Other kinds of thermoplastic moisture resistant mat rial than paraffin wax may be used but in that event it is desirable that the end sealing material be of the same character as the thermoplastic coating although not necessarily so, that is, a paraffin wax end coating may be used with paper coated with some other form of thermoplastic material. I have used the term thermoplastic in its broad sense, and as including a paraflin wax, that is, a material that will set or harden at atmospheric temperatures. Waxes such as crude scale, slack wax and the like, have what is regarded as poor adhesion and are therefore not desirable for coating the sides of a web or sheet of paper but when applied to the ends of the web there is suitable adhesion to seal the edges of the paper and flexibility is not required, that is, the ends of the rolls present a substantially solid surface to which the end coating is applied.

It is desired to point out that the moisture is unstable in any paper unless it is in equilibrium with the surrounding atmosphere and that in ordinary commercial usage, papers of this kind are subject to a very great range of atmospheric conditions. The applicants paper, however, maintains its softness and pliability resulting from a relatively high moisture content under the varying atmospheric conditions commonly found in the use of paper of this character.

While I have illustrated the web of paper with a coating on both sides, the moisture may be quite effectively retained in paper coated on one side only if the paper is wound tightly in the roll as each convolution is in efiect protected on both sides by the coating. Other compact forms of packages of paper with the coating to the edges of the paper may be used with quite satisfactory result, as for example a stack of paper.

I have illustrated and described my invention in a convential type of convolutely wound roll of paper. I have not attempted to illustrate various adaptations which I contemplate as it is believed that this disclosure will enable those skilled in the art to which my invention relates to embody or adapt the same as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. As an article of manufacture a convolutely wound web of paper having a paraffin wax coating on both sides thereof and having cut edges at the ends of the roll, and a coating of paraffin wax on the ends of the roll sealing said out edges, said coating for the ends of the roll having 7 a lower melting point than the melting point of the coat- I ing for the sides of the paper.

2. A convolutely wound web of paper having a paraflin wax coating on both sides thereof and having a cut edge at an end of the roll, and a coating of paraflin wax on such end of the roll sealing said cut edge of the paper, said coating for the end of the roll having a lower melting point than the coating for the sides of the paper.

3. A convolutely wound web of paper having a' moisture retaining wax coating and having a cut edge on at least one end of the roll, and a coating of moisture retaining wax on such end of the roll sealing said cut edge of the paper, said coating for the end of the roll being continuous radially of the roll and being without substantial fusing bond with the coating for the side of the paper.

4. A convolutely wound web of paper coated on at least one side thereof with moisture resisting thermoplastic material, the edges of the web being without such coating, and a continuous coating of thermoplastic moisture resisting material covering the end edges of the convolutely wound web and bridging between the convolutions thereof, said thermoplastic coating for the ends of the roll being without substantial fusing bond to the coating on the side of the paper.

5. A convolutely wound web of paper coated with moisture resisting thermoplastic material, at least one edge of the paper constituting the roll being without such coating, and a radially continuous coating of thermoplastic moisture resisting material covering such end edge of the convolutely wound web of paper, said thermoplastic coat- 4 ing for the end of the roll being without substantial fusing bond to the coating for the side of the paper.

6. A convolutely tightly wound web of wrapping paper having a moisture content sutficient to render it pliable and having a moisture resistant coating on at least one side thereof, the edge of the web at one end of the roll being without such coating, and a radially continuous coating of thermoplastic moisture resistant material covering such edge of the roll of convolutely wound paper, said thermoplastic coating at the end of the roll being without substantial fusing bond with the coating 'for the side of the web.

7. A convolutely wound web of moisture resistant wrapping paper having a moisture content suflicient to render it pliable and having cut edges at the ends of the roll, and a radially continuous thermoplastic moisture resisting material covering the ends of the roll.

8. A package of wrapping paper coated with moisture resisting plastic material and having a substantial moisture content at least one edge of the package of paper being a cut edge and a continuous coating of moisture resistant thermoplastic for such edge of the package of paper.

References Cited in the file of this patent UNITED STATES PATENTS 1,457,625 Freydberg June 5, 1923 1,687,905 Stevenson Oct. 16, 1928 1,909,527 Fischer May 16, 1933 2,036,960 Brenn Apr. 7, 1936