US940450A - Process of manufacturing composition boards. - Google Patents

Description

UNITED STATES PATENT OFFICE.

JOHANN FERLA, OF ST. GEORGE, NEW YORKSSIGNOR 0F ONE-FOURTH TO CHARLES L. PARMELEE, OF GRA on, NEW JERSEY.

PROCESS OF MANUFACTURING COMPOSITION BOARDS.

No Drawing. Application filed September 8, 1906, Serial No. 333,804. Renewed April 1, 1908. Serial No. 424,537.

T 0 all whom it may concern:

Be it known that l, JOIIANN room, a eitizen of Switzerland, residing at St. George, county of Richmond, New York, have invented new and useful Improvements in Processes of lilanufacturing (kmiposition Boards, of which the following is a specification.

This invention relates to improvements in processes of manufacturing composition boards, and it has for its object the provision of an improved process whereby composition boards of great strength and durability may be economically produced from a mixture of hydraulic cement, asbestos and other ingredients.

In practicing the process, the ingredients preferably employed are hydraulic cement,

hemp, asbestos, acetic acid, liquid glue and factorin matter, if desired. The asbestos and hemp are first cut and crushed into very small and fine pieces, almost to a powder, these operations being preferably performed b means of a special cutting machine and right and left revolving crusher. The materials are then elevated, preferably by suction, to a storage room or bin. The finely cut and crushed asbestos and hemp are then mixed in the dry state with cement and coloring matter by any suitable mixing apparatus, such as a rotary mixer or revolving kettle. The dry mixtureis then transferred to ipo thermixin machine, where tnaneeesi s ar quantlities 'o'" acetic acid, liquid glue and watef'are added. At this stageftl'i'ei'iiixture is a pasty mass which is then transferred to a large tank provided with an agitator to prevent the material from settling or hardening. From this tank the paste is carried by a conveyor to a canal where water is added in sufficient quantity to make the mixture flow freely, and from the canal the thin aste flows into tanks of different sizes provided with automatic outlets each adapted to permit the paste to flow from the tank in precisely the proper quantity for the production of composition board of a certain thickness. All of these tanks discharge u on a travelin web or screen, preferably 0 wire-cloth, wl ich permits the bulk of the water in the mixture to drain off. From this web or screen the material passes to an endless strip of felt running between adj ustable rollers which serve to gage thickness of Specification of Letters Patent.

Patented Nov. 16, 1909.

the composition board with accuracy. felt absorbs a certain portion of the water remaining in the mixture and while traveling upon the felt the material hardens sullieiently to be cut as it leaves the felt into pieces of any desired dimensions. The pieces tion is carried on in a hermetiwilly closed chamber connected at top and bottom with suction pumps. The suction pump at the top exhausts the air from the chamber and the material and the other at the bottom of the chamber removes the water from the material, thus supplementing t'h action of the press in producing a thoroughly homogeneous material entirely free from air-holes or pores. After the pressing operation the ma tcrial is still somewhat plastic and may be pressed by suitable dies into any ornamental design or shape or may be readily cut into ornamental patterns by suitable cutting zipparatus.

Before the material is ready for use it should be allowed to harden or set for seventy-two hours after leaving the presses and then should be dipped for a few seconds into water and allowed to dry off. The material is then ready for use and is characterized by great strength, firmness and solidity, but is susceptible of working with ordinary wood-working tools and is entirely free from warping. It is also fire-, acidand waterproof and is excellent material for insulating electrical conductors.

Having thus described my lI1V8IllZlOl1,Wl1fl-ll I claim as new and desire to secure by Letters Patent is:

The 55 The layers of material are sepa 65 1. The process of producing composition boards consisting in first mixing hydraulic cement and fibrous material in the dry state, and then adding to the dry mixture glue, an acid solvent for glue and water in sufficient quantity to make the material flow readily,

next forming layers from the mixture, then pressing the layers and finally allowing the pressed layers to set or harden.

.mixture, pressing the layers and allowing them to set or harden.

ll. The process of producing composition boards which consists in forming a mixture containiir; mineral fiber, hydraulic ren'ient and water in sutlicient quantity to make the mixture flow freely, fOlITJlllg a layer of the mixture, draining the excess of liquid from the layer, pressing the layer in a vacuum and allowing it to harden.

4, The process of producing composition boards consisting in forming a mixture containing mineral fiber, hydraulic cement and water in sufiicient quantity to make the mixture liow freely, flowing the n'iixture on a moving perforated screen in a layer to permit the excess water to drain oil", pressing the layer in a vacuum and allowing it to set or harden.

5. The process of producing cmnposition hoards consisting in first making a mixture containing mineral fiber, hydraulic cement and water in sufficient. quantity to make the mixture flow freely, flowing the mixture on a moving screen in a layer to allow the excess of water to drain off, piling a plurality of the layers of material in a press with interposed pieces of sheet metal, pressing the layers in a vacuum, and finally allowing the material to set or harden.

6. The process of producing composition boards consisting of mixing asbestos, hemp, hydraulic cement, acetic acid, glue and water in sufficient quantity to make the mixture flow freely, flowing the mixture on a moving perforated screen in a layer, pressing the ayer in a vacuum and allowing it to set or harden.

7. The process of producing composition boards, consisting of first mixing; asbestos, hemp, acetic acid, hydraulic cement, glue and sullicient ater to make the mixture llow l'reely, forming; a layer from the mix ture and draining the water therefrom, sub jet-tine the layer to pressure in a hermet ically sealed chamber and simultaneously prt'nlucing a vacuum in said chamber by suclion pumps connected with the chamber at both top and bottom, and finally allowing the material to set or harden.

8. The process of ')roducing composition hoards consisting in mixing asbestos, hemp, cement, acetic acid, glue and water in sufii cient quantity to make the mixture flow freely, forming layers of material fromthe mixture, piling the layers so formed in a. press with interposed pieces of sheet metal, pressing the layers in a hermetically closed chamber and simultaneously producing a \lwlll said chamber by n'ieans of pumps con ected with. the chamber at the top and bottom, and finally allowing the material to set or harden.

9. The process of producing composition boards consisting in mixing fibrous material, hydraulic cement, acetic acid, glue and water, forming a layer of the material, pressing the layer, allowing it to set or harden, then dipping it in Water for a few moments and allowing it to dry.

In testimony whereof, I have signed. my name in the presence of two witnesses.

itnesses:

WM. BRADFORD, Gnimnrr GANNoN.