38 



Hardwood Record — Veneer & Panel Section 



December 25, 1920 



J. J. NARTZIK 



INCOKPOHATED 



MILLS GENERAL OFFICES 



GRAND RAPIDS, MINN. '^'"^ MAUD AVENUE ^^D WAREHOUSE 



DBS ARK, ARKANSAS (^ JJ I G A G O CHICAGO, ILL. 



Rotary Cut Veneers 



and 



Panels 



CARLOAD LOTS OR L. C. L. SHIPMENTS 



Relative Merits of 1-4 Inch and 1-8 Inch 

 Veneer Stock 



In the interest of one of the readers of Hardwood 

 Record, who desires to get opinions on the relative 

 merits of !/4" and J/g" veneers, the question is being 

 presented herew^ith to the trade, with the hope that it 

 may elicit such discussion as will clearly establish which 

 thickness is most serviceable. 



The reader, who requested that his name not be pub- 

 lished, had the foUow^ing to say on the question: "We 

 are contemplating issuing a booklet in which we intend 

 to explain the merits of our veneered doors, their con- 

 struction, etc., and in view of the fact that it has been 

 said that J/^" veneers are better than ]/q" for veneered 

 work, we are taking the liberty of writing to you, and 

 ask if you will kindly give us your opinion of this matter, 

 as we rather doubt the correctness of the statement. In 

 fact, we have always contended that the very opposite 

 view is correct — that the thinner the veneer the less the 

 strain on the glue point. 



"We have before us the booklet of a company which 

 expresses our ideas fully, wherein it states: 'The thinner 

 the veneers the less pulling strain on the glue joint. The 

 comparison of the strains being in ratio to the cube of 

 their sections. One-quarter inch veneer has eight times 

 more pulling strain than one-eighth inch. Therefore, 

 sometimes one-quarter inch veneers break the glue joints 

 and come off in sheets.' 



"There are, no doubt, other merits one thickness of 

 veneer may have over the other, and it is with the thought 

 in view of learning the advantages one may have over 

 the other that we are asking for your opinion in the matter, 

 which we assure you we shall appreciate very much. " 



Believing that this letter opens up a broad technical 

 question that in fairness should be handled by the experts 

 who manufacture veneers and built up stock, Hardwood 

 Record secured permission from the writer of the letter 

 to submit the problem to the trade. 



The Editor of Hardwood Record expressed the opinion 

 that the logic of the case rests w^ith the writer of the 

 letter. He discussed the question in the following words: 

 "The plain advantage of veneer over solid work is the 

 elimination of warping, checking and other deteriorating 

 defects, due to the imposed thin sheets as against the 

 one solid thick piece of lumber. Obviously the nearer 

 veneer approaches a thick piece of lumber the greater 

 will be the tendency to take on the difficulties inherent 

 in solid work. Thus the potential tendency to check 

 and warp would be greater in '/4" stock than it would 

 in J/g" as the '/4" stock is just twice as thick as the other. 

 "Also, we believe that the scientific facts of the case 

 strictly support the claim for the thicker veneer. It is 

 perfectly obvious that so far as the stresses and strains 

 which would act to deteriorate the glue joints are con- 

 cerned, would be multiplied more in direct ratio to the 

 thickness." 



Making Airplane Propellers at Forest Products Laboratory, Madison, Wis. 



