US1464144A - Method for producing imitations of valuable woods and inlaid work on wood by the aid of transfer work - Google Patents

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Aung. 7, H9223.. A

R w. TERLIINDEN METHOD FOR PRODUOING IMITTIONS OF VALUABLE WOODS AND INLAID WORK ON WOOD BY THE AID OF TRANSFER WORK Filed Jan. 19, 1923 www@ y Patented Ang. 7, lll i N una rs RICHARD WILHELM TERLNDEN, F JYVASEYLA, FINLAND, .ASSIGNOR TO WILH. SCHAUMANS TARSU AKTIIEBOLAG, OF JYVASKYLA., FIN.

METHOD FOB. )PRODUCING IMITATIONS 0F VALUABLE WOODS AN D INLAID WORK 0N W001i) BY THE AID 01E' TRANSFER WORK. K

itpplicaticony 1ed`,.Tanua1 ;y 19, 1923. Serial No. 613,771.

To all lwhom t may concer/n Be it known that l, RICHARD WILHELM TERLINDEN, citizen of Germany, residing at Jyvaskyla, Finland, have invented certain 5 new and useful llmprovements in a Method for Producing lmitations of Valuable Woods and lnlaid Work on Wood by the Aid of Transfer Work, of which the following is a specification, for which l have filed an application in Germany on December 19,

The methods for imitating valuable woods, and for making inlaid work on less valuable woods, as used heretofore, in so far as they are based on bodily transferring pictures 'and designs, and in so far as they do not deal with the mere imitation of woodstreaks, have made use of transfer pictures of comparatively small dimensions, in which the colours are applied to an opaque layer (leafmetal,

' whitebody colour or the like). 'The necessity for such an opaque layer was due to the fact that large. surfaces could not be mechanically transferred in a sim le manner and with certainty of success. ne was confined to imitating small inlaid work, but couldnot imitate relatively large panels. Panels were usually first provided by. hand, and over the whole surface, with the necessary Wood tone (for instance chestnut wood, walnut wood or the like), and'then lon the surface thus painted or stained, the comparativelyl small pictures were transferred.

rllhe present invention now permits mechanically coverin large surfaces with a unitary transfer picture, and thus produces an imitation which A cannot be distinguished from the natural wood. This is accomplished by transferring the transfer picture, without any ground layer (such as leaf-metal, white body colour or the like) directly on a previously roughened wood surface by means of pressure and heat.

. The new method diderentiates from the old methods, in that pressure and heat is applied. lt has been proposed to make use of' ordinary printed paper, the colour layer of which has been applied under pressure and heat, to the raw wood. However this method has the-drawback that the paper holds back those parts of the colour which have been absorbed by the paper fibers, and therefore the' picture on the wood will always appear pale. Another diderence over the known Amethods consists inv` first roughening the wood. Heretofore the primary necessity for trnsferring transfer Work on wood was a wood surfacesmoothened `by a ground lacquer surface or by polish. Howevenwhen the wood is thus smoothened in any manner there is the defect that the colour layer transferred will be easily damaged in use together with the delicate lacquer layer, or that it will scale od and become cracked.

According to the present invention the roughening of the wood is preferably carried out yby means of a solution of one part of shellac and 10 parts of spirit. ln this solu-r y tion the spirit has as obj ect to raise the fibers of the wood, while the shellac has as object to ,retain the wood surface in this raised condition until the transferring by heat and pressure has been edec'ted. Due to the heat the shellac is liquefied and penetrates the pores ofthe wood, and therefore does not remain as a layer on the wood surface. \-Due to the pressure during the heating, the wood fibers which had vbeen raised by the spirit to facilitate the transfer will be pressed down smooth. A k

VThe complete process brings out another very important advantage which allows the production of natural imitation. Since the thus 'artly exposing the natural wood of the foun ation, 'and allowing it to shine through.

By eecting in the above manner, a decided and complete separationof the colour layer from the transfer paper, and obtaining its penetration of the wood foundation, thereis obviatedf all 'those' difficulties which stand in the way of transferring of unitary trans-- fer work onto large surfaces.4 r

Heretofore' great diculty has been metl with, in printing from printing plates (for instance lithographie stones)l on which the I originals' are produced by photographic autotype on transfer paper, since the usual gumor dextrin-layer repels the printing col-our. Further, for instance in the lithographie press, the amount of adhesive given oil by the transfer paper to the moistened stone will by degrees spoil the drawing andsmut the ne lines or spots produced by the screen o-r grid.. All' these drawbacks are naturally greater the larger the transfer pictures are. To avoid these drawbacks, it has been proposed, it is true, to coat the soluble layer with a chromolayer. This, however, besides being a very difficult manipuation, has the drawback that the' chromolayer, after the pulling off has been carrled out, covers the picture and must be --washed off, whereby the colour layer may be easily v damaged By a further feature of the present invention the abo-ve named drawbacksare obvia-ted by varnishing the transfer paper once or twice, for instance in a lithographic press, over its complete surface. By these means, it is assured that the colour will be printed without blem'sh, and at thesame time that t-he transferring of parts of the soluble layer of the paper (gum, dextrine or the like) onto the stones, is prevented. The paper thus prepared is printed in the usual manner. This gives a further advantage, in that the transfer paper thus prepared with varnish will be subject to action of the air temperature andhumidity to a much less degree than otherwise, and therefore will not warp, s'o that the various colours will remain in their desired correct grouping, and without any distortion. The necessary heat for transferring the picture on wood, when the paper is prepared in the" said manner, can be reduced to a minimum.

Finally the size' of the transfer pictures makes it' necessary to prevent all tendency` to blister. This tendency is obviated, according to the present invention, in a mechanical Way. Transfer methods heretofore known were e'thercompletely unsuitablefor mechanical production or for production on a large scale, as being too complicated, or

.as unfitted to cover large surfaces, on ac-` l which is transparent at those places the count of the formation of blisters.

In the drawing, by way -of example, a press is shown by the aid of which the formation of blisters or. creases of ,the transfer paper is avoided with great certainty. The

- operation of thispress is carried out by pressure appliedin any desired manner.

Fig. lr of the drawing is an elevation' off an upper press plate;

Fig. 2 is an elevation of an under press Plate;

yFigs. 3 and/4 show .side views of the Lplates. J

In the center of the lateral edges of the heated upper press plate a, bolts b and c are fastened. Below the press plate a a springy metal plate d, bent downwardly, is arranged. In the center of the 'lateral edges of the plate d ferrules e and f are attached, which are adapted to slide on the bolts b and c and, bend'ng upwardly from the plate d, present displacement in a. horizontal direction. When tensioned to a slight extent, the plate d, with its free outer,ends, will bear against the ,lateral edges of the press plate a, and with its ferrules e and f, on the heads of the bolts b and c. When the press material p (a wood plate with superposed paper)` is shifted on to the lower tab-le on closing the press, first a proper pressure will be eX- erted in the middle, and which expands toward the sides, the more the press surfaces approach each other. Thus the paper will be smoothly pressed onto the wood plate, starting from the Acenter and working outwardly, without blisters or creases.

A number of 'suggestions have beenmade heretofore to prevent the formation of blisters, as by striking along the paper or by pressing it by atmospheric pressure. However, the above described press is a decided advance, since the springy plate attachedrto the machine requires no special manipulation, and at the same time allows the application of heat and pressure according to the above described method, for any length of time. V

In practice it has been found that a pressure of 5 kg. to l [j cm. and a temperature of 110o C. will be amply suiicient.

1. A method for producing imitations of valuable woods and inlaid work on wood, by means of bodily picture transfer work, comprising, roughening the wood surface, and transferring the picture directly onto the roughened wood surface, under application of pressure and heat.

2. A method for producing im'tations of valuab-le.woods and inlaid work 'on wood, by means of bodily picture transfer work, 'comprising producing a transfer picture tones of which correspond with the tones of the natural wood color, roughening the shellac in` spirit, and

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