Hardwood Record — Veneer & Panel Section 



August 10, 1917 







"EASIMOOV" 



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 having served its purpose, without be- 

 ing sanded. Saves time and expense. 



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IDEAL COATED PAPER CO. 



The Veneer Tape Specialists 



MAIN OFFICE AND ^3ILLS, BROOKFIELD, MASS. 



Mixed Wood in Built-up Work 



Generally speaking, the experienced glue room man or the 

 student of panel making and built-up -work will argue that where 

 practical it is better to build up a panel all of the same kind of 

 wood. They will explain, of course, that this is not always done 

 for the reason that some of the face \voods are too expensive to 

 use for cores, and the difference in cost outweighs in a commercial 

 way advantages offered in making built-up stock all of the same 

 kind of wood. 



In contrast \^'ith this we have some of the authorities w^ho have 

 experimented with built-up blocks for aeroplane work asserting 

 that the best results are obtained by mixing the wood, by making 

 built-up work of different kinds of wood. For example, there is a 

 combination of spruce, mahogany and ash which it is claimed gives 

 better results than to use any one of the woods exclusively. 



The main reason why the glue room man contends that using 

 the same wood for cores as for faces is that it is of the same struc- 

 tural nature. Consequently, the glue will adhere evenly to each 

 surface, and the same glue will spread and penetrate to the same 

 extent on both sides of the joint. On the other hand, if the face 

 wood is very dense and the core wood open and porous, a thin glue 

 w^hich will penetrate the face w^ood will be absorbed into the porous 

 w^ood of the core so freely as to starve the joint. In reverse order, 

 if the glue is made thick and heavy to fit the porous wood in the 

 core it will not penetrate and adhere as it should to the face %vood 

 of finer texture. The points in favor of using the same or similar 

 woods are for the sake of getting better glue results. It is prac- 

 tical to get the glue results by other means, however. Wood that 

 is open and porous can be sized, or a compromise glue mixture 

 can be devised and difficulties of inequality mi the nature of the 

 w^oods used can be overcome. It takes more skill, care and thought- 

 ful attention, that is all. 



We have not had. so far, a very definite presentation of the 

 points in favor of mixing woods in built-up work; that is, the struc- 

 tural or mechanical points. In general, the main reason for mix- 

 ing goods in ordinary built-up work are those of commercial econ- 

 omy. Often much cheaper w^oods are available for fillers and 

 backs than it is desired to use for the face work and this has b~en 

 the dominant factor in the mixing of woods in built-up work. 



Sometimes other factors have entered. In heavy work, like 

 doors, if there is to be tenoning and mortising of the frame, the 

 softer woods give better satisfaction structurally than the hard- 

 woods. In the general run of built-up work, however, there have 

 entered so far only the two phases for consideration. One is the 

 comparative cheapness of the w^ood available for the filler and 

 cores making the mixture. The other is in the desire for uniform- 

 ity in the glue-absorbing qualities of the woods used, to simplify 

 and make safer the w^ork of gluing up. There is some indication, 

 however, that we are going into new phases of this matter soon 

 and will have as a factor in the future a study of the structural 

 advantages which may be obtained by the use of various combi- 

 nations of wood in making built-up work. It is an interesting field 

 for experiments, especially in the development of built-up lumber 

 for box panels and for many purposes involving a combination 

 of the greatest strength with the lightest weight. 



The Rudolph Veneer & Products Company is manufacturing 

 baskets and veneers at Denver, Colo. 



At Nicholson, Miss., the State Line Veneer Company has been 

 incorporated at $10,000. 



Getting help in the woods is quite a problem this year with 

 the farms and munitions factories paying all sorts of wages and 

 needing more help than is available. 



Walnut not only continues in high favor as a furniture wood 

 but it is helping to popularize the brown tones in staining other 

 woods for furniture finish. 



AH Three of Us Will Be Benefited if You Mention HARDWOOD RECORD 



