42 



Hardwood Record — Veneer & Panel Section 



August 10, 1921 



'OOD 



STERLING 



^iLfleld 



M^ 



HIGH GRADE 



PLYWOOD 



Tops Fronts 



Backs Bottoms 



Stock Pane 

 Trunk Stock & Hangers 



REPRESENTED: 

 GRAND RAPIDS. MICH. . .F. K. TINKHAM 



CHICAGO, ILL G. M. PALMER 



ROCKFORD, ILL K. E. KNUTSON 



Send us your inquiries 



Rod^s Lumber & Veneer Co. 



27 Years at Marshfield, Wis. 



PURCELL^ 





Are You Interested in the 



Following Exceptional Values 



in High Grade Walnut? 



ls&2s, ail6 &7 long. . . 

 4 4,5/4 &6 4 



Is «& 2s, all 8' & 9 long 



4 4, 5 4, 6 4 & 8/4 



Selects 4 4, 5 4, 6 4, 8 4 



No. 1 Com 3 8, 1 2, 5 8, 

 3 4, 4 4, 5 4, 6 4 & 8 4 



No. 2 Common 



4 4, 5 4, 64&84 



ALL STEAMED AND 10 

 MONTHS ON STICKS 



M=IIs and 

 Offices 



FRANK PURCELL 

 Kansas WALNUT LUMBER CO. 



City, 

 Kansas 



A Ranking Name in Wainut 

 for Many Years 



WALNUT: 



How Much Steam for Your Dry Kiln? 



One seldom hears the word economical applied to dry kilns and 

 their operation. Today the cry is for greater and still greater 

 efficiency — kilns that will dry the lumber in the least possible 

 time: methods and schedules that will reduce warping, checking 

 and similar troubles to an irreducible minimum. When these 

 desirable features have been secured, every one, from the factory 

 owner or manager down, pats himself on the back and appears 

 to be well-satisfied. 



It is only natural to suppose that efficiency and economy go 



hand in hand that when efficiency has been secured the kiln is 



on an economical basis. If results are the criterion, or we judge 

 solely from the time required to reduce the moisture content, the 

 quality and condition of the stock as it comes out, a moment's 

 thought will be sufficient to convince one that this need not be 

 so. A kiln might be operated so as to secure almost ideal results, 

 yet n^ight be consuming twice the quantity of steam that it would 

 require if properly constructed and equipped and the equipment 

 all working satisfactorily. In dry kiln operation we are all too 

 prone to judge solely by results and forget all about costs. 



Steam engineers have established the figure $1.75 as the basic 

 cost of 1,000 lbs. of steam. Of course this figure will vary in 

 different plants, due to varying conditions, and in many instances 

 will be found to be much too low. If a drykiln consumes, say 

 75,000 lbs. of steam per day, where 35,000 lbs. could and should 

 give the same effectiveness, then, regardless of the results secured, 

 it can hardly be said to be on an efficiency basis, and certainly 

 not on an economical one, for on the above basis over $50 worth 

 of steam is consumed daily from which no return at all is secured. 

 How much steam is your drykiln consuming? 



In this article 1 will not touch on the operation of the kiln, or 

 the fact that a careless or ignorant operator may leave a run in 

 for hours and even days longer than is necessary. I will also 

 disregard the time factor in loading and unloading, for considerable 

 time and money may be sa^d or lost in this simple operation, and 

 will deal briefly with certain factors that reflect directly on the 

 steam consumption per day or run. Steam losses or excessive 

 steam consumption may be due to a number of causes, such as 

 loss of heat from radiation or poor construction, or to the fact 

 that the steam may be rushing through the kiln without giving 

 up its heat. 



In the modern double-walled brick or hollow-tile drykiln the 

 loss of heat by radiation need not be considered, but one often 

 finds kilns of wood construction where the walls are single-ply 

 sheathing, with an odd knot-hole to aid in its ventilation. In such 

 a kiln — and there are many such — the loss of heat by radiation 

 is a considerable item. It should be remembered that this loss is 

 going on steadily, night and day, as long as the kiln is in operation, 

 and that this attempt to heat the surrounding atmosphere is costing 

 hard-earned money. In constructing or remodeling any type of 

 kiln, every effort should be made to insulate the walls and roof 

 so that all the heat generated may be kept at work removing the 

 moisture from the lumber. The saving thus effected will amply 

 repay for any time and expenditure involved. 



Another source of heat loss is the method of ventilation — the 



size and location of the ventilators and air-ducts. To entirely 



too many, a drykiln is merely a room or rectangular building with 



a few pipes on the floor or along the walls, and perhaps a ventilator 



\ Ciuit intirii 0)1 piiijc 46t 



