US1595346A - And walter a - Google Patents

Description

Aug. 10 1926. 1,595,346

L. F. LONG El AL PROCESS OF CORRUGATING SHEETS Filed Dec. 15. 1920 T Q P 5 L ft 5 Fig.2.

INVENTORS ATTORNEY Patented Au 10, 1926.

UNITED STATES 1,595,346 PATENT OFFICE.

LEONARD F. LONG, OF HOBOKEN, NEW JERSEY, AND WALTER A. FORMAN, .OF BROOK- LYN, NEW YORK, ASSIGNORS TO THE BARRETT COMPANY, A CORPORATION OI" NEW JERSEY.

PROCESS OF CORRUGATING SHEETS.

Application filed December 15, 1920. Serial No. 430,820.

This invention relates to a method for corrugating sheets of materials which would ordinarily be cracked or injured by bending or distorting the same.

Heretofore processes have been known by which sheets of fibrous material can be made on a paper-making machine and duringthe process offormation of such sheets comminuted particles of waterproofin material can be embodied in said sheets by-merely introducing the same into the paper-making machine along with thewatery pulp of H- brous materiaL. These sheets may be dried sheet is first formed from a plurality of con-- volutions or laminations of a single sheet that is formed on a paper-making machine, preferably in such a manner that the fibers along contacting surfaces of the convolutions or laminations are felted or matted to an appreciable extent so as to roduce an initial integration or joining of t e sheets. After the thick-sheet has been made it" is heated sufliciently to melt the contained watergroofl mg material and is corrugated whi the waterproofing material is in this molten condition, the sheet being maintained in its corrugated shape until the same has been cooled, thereby causing it to set and assumev a permanent corrugated form.

The invention will be understood from the description taken in connection'with the accompanying drawings in which Fig. 1 is somewhat diagrammatic 'view showing how the sheet is formed on a papermaking machine and rolled up.

Fig. 2 shows the sheet folded up. Fig. 3 is an elevation of a press in which the sheets may be corrugated.

In the drawings, reference character -1 refers to the vat of a paper-making machine in which is a foraminous cylinder 2, upon which a sheet 3 of fibrous material is made in the usual way and picked up by the wet blanket 4 passing over rolls 5 and 6. The sheet 3 passes between the rolls 6 and 7 where some of the water is squeezed outand is then rolled up on amandrel 8. The comminuted bituminous material is introduced into the vatl along with the paper pulp and becomes incorporated in the sheet 3 as the same is formed. When a sufiicient number of turns have been made on the mandrel 8 the sheet is severed and the roll is slit along a line parallel to its axis and then spread out as a flat sheet.

Instead of rolling the sheet up, as indicated in Fig. l, the sheet may be folded back and forth, as indicated'in Fig. 2, thus forming a sheet of the desired numberof layers to produce the proper thickness. It is preferable to have the sheet 3, as it isbeing rolled or folded-up as above indicated, u1te wet so that the fibers on' the surfaces 0 the same will become matted or felted. to an appreciable extent during the, in operation.

he press shown in Fig. 3 consists of a base 9 and a member 10, both of which are provided with hollow portions 11 and 12 into which may be introduced heatmgand cooling fluids. 'The faces of the base 9 and member 10'are corrugated as indicated, and

along the face of corrugations are disposed thin flexible plates 13 preferabl of metal that are'heldby s rings 14 as in icated.

Heretofore 'it has been found that when thick sheets, say about one-quarter of an inch thick, are made of fibrous material and a high percentage, say about to-90%, of comminuted bituminous material and are bent, they will crack or be injured on the surface or even break through the sheet. 'It

rqlling or fold has been found that sheets made as indicated in Figs. 1 or 2 can be successfully corrugated by properly handling the same in such a press as is indicated in Fig. 3. For this purposethe sheet is placed between the thin metal plates 13 and after bringing the plates 13 into contact with the surfaces ofv the sheet the same is thoroughly heated 'by admitting heating fluid to the hollowportions 11 and 12 until the waterproofing material is melted. .This melting of the waterproofing material decreases the stiffness or in contact with the surfaces of the sheet to be pressed, help to conduct the heat to said sheet and uniformly heat the same! These plates 13 also remain in close contact with the surfaces of the sheet to be pressed and slide over'the corrugated surfaces so that the sheet of fibrous and comminuted material is thereby bodily carriedint'o the corrugations of the plates without being torn or stretched.

Preferably the water is dried from the sheet before it is inserted in the press, and the sheet maybe heated to melt the bituminous material before it is introduced into the press, or the sheet may be partially heated and the heating operation completed .after being introduced in the press, orthe heating operation may take place entirely in the press. X en the sheet has been pressed so as to orm the corrugations, the pressure is maintained while the heating fluid is turned ofi and cooling fluid is introduced to cool the press and sheet, thus permitting the waterproofing material to solidify and insuring the maintenance of the corrugated form when the pressure 1s removed. The amount of pressure may vary from 100 pounds to 300 pounds per square inch more or less and the densification of the pressed sheet may be approximately 50%, and the specific gravityof the pressed corrugated sheet may be made to be about the same as that of the bituminous material itself. I

hot pressing operation in a press having corrugated faces so as to corrugate the same as above described.

For certain purposes we have found that the bituminous material to be used may, for example, be pitch of a ;melting point of about 250 F., and the amount of pitch. may be by weight about to 90% of the water-free content of the final product. I claim: I v 1. The herein described process, which comprises forming on a paper-making machine a sheet containing fibr'ous material and pitch, pre-heating said sheet sufliciently to melt said pitch, and pressing said sheet between corrugated plates without materially tearing the, fibers of the sheet. 2. The herein described process, which comprises forming on a paper-making'machine a" sheet containing fibrous material and solid waterproofing material, pre-heating said sheet sufiiciently to melt saidwaterproofing material, pressing said sheet in opposite directions from its normal plane between corrugated plates without materially tearing the fibers of the sheet, and cooling said sheet while maintaining said pressure.

3. The herein described process, which comprises forming on a paper-making machine a sheet containing fibrous material and pitch, pre-lieating said sheet sufiiciently to melt said pitch, pressing said sheet in opposite directions from its normal plane between corrugated plates without materially tearing the fibers of the sheet, and cooling said sheet whilemaintaining said pressure. r

4. The herein described process, which comprises forming on a paper-making machine 'a sheet containing fibrous material and solid waterproofing material, preheating said sheet sufiiciently to melt said waterproofing material, and corrugating said sheet by application of pressure substantially perpendicular to its surface along lines upon its opposite sides staggered with respect to each other without materially tearing the fibers of the sheet. 5. .The herein described process, which comprises forming on a paper-making machine a sheet containing fibrous material and solid waterproofing material, pre-heating said sheet sufiicientlyto melt said waterproofing material, corrugating said-sheet by application of pressure substantially perpendicular to its surface along lines upon its opposite sides staggered with respect .to each other without materially tearing the fibers of the sheet and cooling said sheet while maintaining said corrugating pres-' sure.

I 6. The herein described process, which comprises forming a sheetcontainingfibrous material and solid waterproofing material,

pre-heating said sheet sufficiently to meltsaid waterproofing material, and pressing said sheet between corrugated plates that have thin flexible plates disposed along the faces of saidcorrugations conformable to said corrugations when under pressure.

7. The herein described process, which comprises forming on a paper-making mach e' a sheet containing fibrous material a'nll solidwaterproofing material, pre-heating said sheet sufiiciently to me'ltsaid waterproofing' material, flat pressing said sheet and subsequently hot pressing said sheet between corrugated plates without materially tearing the fibers of the sheet.

'In testimony whereof we aflix our signatures.

LEONARD r. LONG. WALTER A; roam.

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