US1646597A - Process of making plaster board - Google Patents

Description

Oct. s Y

o. L. RouTT Pnoczss 0F MAKING PLASTBR Bomb Filed Aug. 23, 1922 nven for ning around a roller, 2.

Patented Oct. 25, 1927.

' yUNITED STATES PATENT oFF ICE.

ORVILLE L.. ROUTT, 0F LOS ANGELES, CALIFORNIA.

PROCESS OF MAKING PLASTER BOARD.

Application led `August 23, 1922. Serial No. 563,729.

My invention relates to a new process for making plaster board and is capable of use in connection with a wall board machine, whereby Such a machine can, with the use of my invention, be readily and comparatively V terial is removed durin the processto form a rough and slightly ollowed area which forms the bond between the plaster vboard and the coat of plaster applied thereto. By the removal of-a small amountof the plastic material at the openings through the surface covering, there is provision for the attachment of the plaster coat and at the same time the surface of the plast-er board is smooth and free of any projections to interfere with piling of the same. By my 1mproved process, am able to manufacture such a plaster board with a minimum of ma.- chinery and expense.

In order to clearly explain my` inventlon, I have illustrated one method of carrying out the process on the accompanying sheet of drawings, which I will now describe.

Figure l is an edge, or diagrammatic view of an apparatus for carrying out my 1mproved process; l

Figure 2 is an enlarged sectional view of revolving dies "for cuttingV the openlngs through one sheet of the covering for the plaster board;

Figure 3 is a fragmentary sectional view, enlarged, showing the bottom sheet, the plastic material, the top sheet with the openings therethrough, and the forming sheet; an

Figure 4 is a view of ter board.

Referring more in detail to the drawings, 1 designates a forming beltor carrier, run- This may be of any suitable construction. A roll of paper, 3, is provided for use in formino' the bottom sheet or surface of the plaster 7board and this is carried forwardly on the carrier 1. The platic material, 4, is fed from a hopper, 5, or

the face of the plas- Vother suitable feeding apparatus, on to the sheet 3, as illustrated.

Ato pass under the roller 6,

In the present showing of the invention for illustrative purposes, instead of using a-y separate roll of paper for whata I will cal] the forming sheet, I use another roll of paper.

similar to that shown at 3, and, carry it around-a plurality of rollers and pass it twice under the machine roller, 6, said second roll of paper being designated 7. I will now trace the course of the paper from the second rollV 7. After passing around the roller 6, it passes forwardly and upwardly around rollers, 8, 9 and 10, and thence between roller dies, 11 and 12, which cut perforations or openings, 13, through the sheet;l as will be clear from the fragmentary view in Fig. 4, said `openings being here shown as of diamond shape, but which can-befof any desired form. From the-dies, said sheet passes again around the roller 6, and on top of the plastic 'material 4, the upper lap of said paper covering the openings as the sheets pass under the roller 6 and forming the plastic material into a uniform layer orsheet. As the upper layer or lap of the paper, which Iwill designate 7a, leaves the perforatedsheet and passes up to the take-up rollers 8, 9 and 10, a certain amount of the plast-ic material, through the perforations or openings 13, ad-v heres to said upper sheet 7", and 'is brushed therefrom by means of a revolving brush, 14, above the roller 8, as shown in Fig. 1. This leaves a hollowed condition in the platic material at the opening in the face sheet, as indicated at 7b, Athus providing an efficient means for forming a bond between the plas-l ter board and a coat of plaster when applied thereto, and at the same time the surface of the plaster board is smooth-and can be piled Y Hat, one sheet upon another without any ldanger of breaking off projections from the surface thereof. l

It wll be clear, I believe, from the showing made, that my invention can bey applied to' a wall board machine by the simple'provlsion of means for putting the openingsthrough the sheet of paper or other/'covering' and then providing a forming or/coveringf sheet above the sheet having the openings therein to prevent the plastic material from pressing through said openings, and for lifting outa small portion of the plastic material, through the' opening, as the top sheet moves away therefrom.

I am aware that various ways can; be used for accomplishing the process or function described and that changes can be made in the showing made, and I do not, therefore, limit my invention to the showing made eX- cept as I may be limited by the hereto appended claims.

I claim:

1. The process of manufacturing plaster 4board which consists in pressing a surface sheet having vopenings therethrough on to plastic material, with a lap of said same sheety above the portion having the perforations therein to overlap said perforations, and causing the plastic material at the openings to be roughened by removing the lap of said sheet from the perforated sheet.

v 2. The process of making plaster board consisting of forming plastic material into sheets between two sheets of paper, oneJ Aof said sheets being doubled as it is pressed upon said plastic material, the lap ofl said paper being pressed directly upon said :plastic material being perforated and the other lap of said paper covering said perforations as said plastic material is rolled intog; sheets, and being pulled away therefrom aft-er said plast-ic material is formed into sheets and removing small quantities of said plastic Inaterial through said perforations, whereby to roughen the same to receive plaster thereupon. i

Signed at Los Angeles, California, this 17 day of August, 1922.

oRvILLE L. RoUTT.

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