US1901024A - Art of marking plastic material - Google Patents

Description

March 14, 1933. J, EDGE 1,901,024

ART OF MARKING PLASTIC MATERIAL I Filed July 12, 1929 I I fizz/622227 7 .facafqye Patented 14, 1933 i UNITED STATESLT PATENT OFFICE JACOB EDGE, or zoowmne'row'n, PENNSYLVANIA, AssIeNoR, BY MESNE ASSIGNMENTS,

'ro UNITED STATES GYPSUM COMPANY, or WILMINGTON, DELAWARE, A CORPORA- TION or DEL WARE I AB! on M RKING PLASTIC MATERIAL Amman filed m 12, 1929. Serial a"... 377,729.

The present invention relates to the art of with the mechanism for pressing the newly marking plastic material, andmoreparticuformed board. I larly to the marking of articles formed from Referringmore particularly to the drawfibrous matter such as wood pulp and ,sim-' ing there is shown at in Fig. 1 a cylinder 1 ilar material. The invention is particularly vat which may be of usual construction and 55 advantageous foruse in connectionwith' the in which there is mounted hollow cylinder 6 manufacture of relatively thick sheet mahaving the usual form of perforated face for terial such as wall boards or insulating feltingthe stock which is run into the cylinboards. One object'of this invention is the der vat 5; The board 7, formed on cylinder 6 1 0 provision of suitable mechanism-for markpasses away from'the cylinder and between 60 ing products of this character which will not a pair of endless carrying felts 8, 8 which are involve any extensive alteration in machines arranged over rollers 9, 9. Intermediate the I now being used. Another object of the inrollers 9, 9 there is disposed-a plurality of vention is toprovide, as a new article of press rolls 10, 10 which may be adjusted manufacture, an article having a distinctive toward and from each other in a well known 65 marking placed on at least one of the faces manner. These press rolls function to rethereof. To, these and other ends the invenmove the excess water from the newly-formed 'tion resides in certain improvements and board and to compress the'board to increase combinations of parts, all as will be hereinits density and decrease its thickness. The

after more fully described, the novel features mechanism thus far described is, of a gener-"m being pointed out inthe claims at the end of ally conventional form. f p v 5 the specification. 1 In accordance with the present invention In the drawing: Q there will be provided on at least oneof'the Fig. -1 isa diagrammatic view of a board felts 8, preferably on the lower felt which formlng machine, to which the present invenengages the hack face of the board, one or tion has been applied; more raised characters which will be ar- Fig. 2 is a detail view showinga ortion rangedon that face of the felt which is adof the felt to whicha markin means, ormed jacent to the board being formed.

according to the present em odimentrof the The raised characters on the felt may be 30 invention, has been applied; formed in various ways but, in the present Fig. 3 is a view-in cross section taken on instance, there 'is' preferably secured to the line 3 -3 of Fig. 2; and face of the felt a stron tough cord, such as Fig. 4 illustratesa portion of pulp board for example what is own as chalk line. bearing a marking therein in accordance This cord may be worked into the fabric of '3 with the present invention. the felt, as shown at 11, or it may be laid '85 Similar reference numerals throughout the on the-face of the felt and secured thereto by several view's'indicate the same parts. a fine strand of cord or thread as shown at .The present embodiment of the invention 12. In some instances the characters could provides a method and apparatus of the class he formed by first laying a strand of cord 0 described which are simple in nature and upon the face of the felt and thenusing the capable of producing, at a very moderate same sizetord by working it alternately into 7 cost, the desired results of marking the board the material and over the. first mentioned and at the same time permitting effective strand or cord with the loopsthereof passing control of the manufacturing operation to closely adjacent each other so: as to form the producea uniformly high-grade of product. raised character. Obviously this may be- 5 The present invention is also particularly addone other ways, for example, the cord may vantageous for the reason that no change be secured in place by metal clips orvin some need be made in present board forming mainstances may be secured to the felt by a chinery other than a change in the felt or suitable adhesive material. Insteadof using 50 other material which are ,usedin connection cord it is possible to formfsuitable characters by using narrow strips of felt which are secured to the felt in the manner above described.

Another manner of forming the raised characters is to apply on the face of the felt a series of strands of thread arranged in the nature of embroidery work. This can be done by the use of embroidering machines of conventional design. An example of this style of character is illustrated at 13 in Fig. 2.

Any number of markings can be disposed upon the felt 8 but, in the present instance, it is preferable to space the individual, markings a foot or more apart so that when the board is being used and is cut into smaller pieces, as in the construction of a house, the markings, such as a trade-mark, will appear even on the smaller pieces of board.

It will be readily seen that, after the board is formed and passes into the space between the felts 8, 8, the face of the felt will come in contact with the board and travel along with the board in fixed relation therewith, and the raised characters on the felt will bear against the relativelv soft face of the newly formed board and will be imbedded therein, then as the board travels further between the felts and reaches the press rolls 10, 10 a considerable amount of water, which it contains,

-will be squeezed out and the board will be reduced in thickness and, at the same time, the raised characters on the felt will be more sharply embedded in theboard and the material of the board will be closely pressed around the individual strands forming such character. The result is that the board leaves the press part of the machine with sharply formed intaglio markings so that when the board subsequently passes to the dryer the marks will be retained permanently in the face of the board.

It will thus be seen that the present invention provides a very simple method and apparatus for applying markings to plastic pulp articles and, in case of machines forforming articles in the shape'of boards, there will not be any alteration needed except what alteration is necessary in the felt which is always a replaceable part of the machine.

The present method of markings is not limited in its use to endless felts, as indicated in the drawing, but may be carried out with equal facility by felts which are not endless in form.v

I claim: I

1. A carrying felt for use in board forming machinery, said felt having secured to at least one face thereof a cord arranged to form an int'aglio mark in the adjacent face of the newly formed, comparatively soft board.

2. A carrying felt for paper making nia chines having a cord sewed therein so as to present a plurality of adjacent strands disposed on at least one face thereof and adaptside of one face thereof by means of a relatively fine strand of thread fastened successively into the felt and around said cord, said cord being firmly secured to the face of the felt and arranged to present a raised character thereon so that pronounced, permanent markings will be formed by said cord in the adjacent face of the newly formed, comparatively soft board web.

4. A web-carrying felt for board making machines, the felt having substantial, raised portions formed into designs at intervals on its surface, said raised portions contacting directly with and pressing into thesurface of the wet, plastic web carried by the felt to form pronounced. permanent, indented markings in said web.

5. In combination in a machine for forming sheets of plastic material, means for forming the plastic material into a web, carrying felts for supporting said web while in a more or less plastic condition, means for compressing said felts and said web to remove excess moisture from the web and densify' the web, and means secured on the face of at least one of the felts comprising cord or the like formed into a design substantially raised from the surface of said felt and directly embedding in the surface of said web, whereby pronounced, permanent intaglio markings will be formed in said web by said raised means while the web is carried by said felts and is being densified. 6. The method of marking a web of plastic material which comprises passing said webbetween carrying felts, at least one of which is provided 'on its face in contact with the web with raised markings, and gradually exerting increasing pressure upon said felts whereby the density of the web is increased 'and the raised markings become embedded with the web, carrying the web upon said felt between press rolls to densify said web andto thoroughly embed the cord designs in the web, and after said'web has been densified, removing it from said carrying felt, whereby said web will have pronounced, permanent. indented markings. 8. The method of marking newly formed web's offiber board which comprises securing substantially raised characters upon that face of a carrying felt which comes in contact with the web. carryingthe web upon said felt between means for gradually increasing the densit of the web and thoroughly embedding t e raised characters in the surface of the web, removing the web from the felt, and drying said web, whereby said characters will appear in reverse in said web as pronounced, permanent, indented markings.

9. The method of marking plastic webs of fiber board which comprises securin substantially raised characters upon the ace of a felt, bringing the face of said felt having the raised characters into intimate. contact with the face of said web while still in plastic condition, exerting ressure u on said felt and web to densi t e web an to thoroughly embed the ra1sed characters in the surface thereof, and drying said web, whereby pronounced, permanent, indented markings will appearin the surface of said web. Signed at Downingtown, Pennsylvania, this 8th day of July, 1929.

JACOB EDGE.

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