Патент USA US2409786код для вставки
oct, 22, 194e. D. NEWMARK ETAL METHOD OF 'PRODUCING BALSA SLIC’JES Filed Jan. 7, 1944 4V//// 2,409,785 Patented Oct. 22, F‘1946 FT UNITED STATES ‘ PATENT 2,409,785 OFFICE 2,409,785 METHOD OF PRODUCING BALSA SLICES David Newmark and William Kramer, ’ New York, N. Y. Application January 7, 1944, Serial No. 517,456 1 1 Claim. (Cl. 117_4) 2 This invention relates to slices of balsa wood, slice therefrom, and showing the concavo-convex either singly or in plies thereof, the method of contour assumed by the slice in the cutting op their production and the product thereof, pro eration. _ duced without waste of balsa material; also that Fig. 2 is a side sectional View showing a curved the product may present smooth, satinlike sur slice of balsa in its passage between straightening faces capable of having imposed thereon printed rollers, over an adhesive delivering roller, and or otherwise delineated designs as guides in cut between hot, pressure rollers. ting out toy or model configurations. Fig. 3 is a section taken on the line 3-3 of Fig. The usual method of producing balsa slices or veneers is by sawing them from a block of that 10 Fig. 4 is a section taken on the line 4_4 of Fig. material, but this results in considerable wastage 2. due to the thickness of the Saw and the relatively Fig. 5 is a side sectional View, corresponding to large amount of wood that is removed in the Fig. 2, but showing two slices of balsa being form of sawdust. formed into plywood by the hot, pressure rollers, Knife slicing of balsa has been resorted to but and so far as is known to applicants the balsa has Fig. 6 is a section on the line 6-6 of Fig. 5. ñrst been subjected to a steaming process and In said figures let I indicate a rectangular block the slices are subsequently put through a drying of balsa wood, showing a knife 2 angularly oper operation. Such slices 0r Veneers are not em ating in the act of severing slices 3 therefrom, ployed by us in the present invention. 20 and showing that in such severing act the slice By the instant method balsa slices and ply assumes a concavo-convex contour, as indicated wood veneers are sheared from a block of dry in Fig. 3, the convex side having developed there balsa, the thickness of the »blade causing the on the crevices appearing in said figure. This slices to curl outwardly away from the block, the curved slice is now passed continually and pro cut or convex surface of the slice being rough and 25 gressively `between the straightening rollers 4, 4, besides having developed in the slicing operation into a series of lengthwise interstices or crevices at the convex side. It is more economical to slice the balsa in a dry and passes with its creviced side contactingly over a roller 5 `that is journalled at 6 in a bath 1 of contained fluid resin, glue or other suitable adhesive, an upper roller 8 causing the slice to state, but the consequent roughness of the slice 30 have frictional contact with roller 5 in order that surfaces renders the out slice unsuited to the pur the adhesive may be applied to said creviced side; poses for which it is intended. Therefore the or the adhesive may be applied to both sides, in curved slice is passed between rollers to straight which instance a container like that shown at I4 en it, then receives a coating of resin, glue or in Fig. 5 may be added to apply the adhesive also other adhesive, on the convex surface that had 35 on the upper side of slice 3. Thence the slice developed the crevices, and finally is passed be continues progressively to a series of heated, tween heated. pressure rollers, having the effect pressure rollers 9 and in its passage between pairs of impregnating the substance of the slice with of these rollers the adhesive becomes impreg the adhesive and impartingr thereto smooth, satin-like surfaces upon which desired delinea 40 nated in the slice of balsa whose surfaces through the applied heat and pressure acquire a smooth, tions can be imposed. satin-like finish that renders the slice suitable In producing balsa plywood by this method two for the designated purposes of the invention. cut slices of dry balsa are opposed at their con In the example of the invention illustrated in vex surfaces, straightened in the same manner Figs. 5 and 6 two separate slices I 0, II of balsa as with a single slice, given a coating of an ad hesive on the inner surface of one or both of the `are shown with their convex sides in opposition, slices and then passed ‘between the hot, pressure each slice being passed between separate pairs of rollers as before. rollers, respectively l2 and I3, to straighten them; thence said slice I I appears as receiving on its Obviously the balsa plywood may comprise any desired number of slice plies. creviced side a supply of an adhesive from a con Other features and advantages of our inven tainer I4, the slice being supported at this point tion will hereinafter appear. by a roller I5. Thenceforward the slices are re In the drawing: spectively guided by pairs of rollers I6, I‘I toward Figure 1 is a perspective view of a block of balsa a series of pairsv of heated and pressure rollers Wood, showing a, knife in the act of cutting a 65 I8, and during the passage of these slices between 2,409,785 3. these pairs of rollers the slices are combined into plywood and impregnated with the adhesive. By the aforesaid method the plywood surfaces acquire the same smooth, satin-like ñnish as in the instance of the single balsa slices. While we have designated balsa as the wood to be treated in the manner hereinbefore set forth, other “soft” woods, such for example as bass, sugar pine, etc., may be included in the same 4 We claim: The method of producing thin, straight, ñat slices of balsa wood having smooth, satin-like surfaces, for use in the manufacture of toy and model articles, which consists in cutting said slices from a dry block of balsa by verticaI knife action, whereby each slice acquires a concavo convex contour whereof the convex side has crev ices developed therein, and then progressively category, provided their characteristics enable 10 subjecting each slice, while continually moving, to the following steps: ñrst passing each slice them to respond to the treatment and thus ac between rollers to straighten it, then passing each quire the stated smooth, satin-like iinish capable slice with its creviced side over an adhesive gath of receiving imposed delineations for the desired ering roller, and finally passing each slice be purpose. Variations within the spirit and scope of our 15 tween heated pressure rollers. DAVID NEWMARK. invention are equally comprehended by the fore WILLIAM KRAMER. going disclosure.