3564 Chapter 28 



These amounts are based on 1976 wood costs. For each dollar per ovendry ton 

 that wood costs exceed those in table 28-10, amounts will be reduced by $1 .24 to 

 $1 .36/MSF. For example, if wood costs are $15/ovendry ton higher than values 

 in table 28-10, spreads will be reduced $18.60 to $20.40/MSF. 



Assuming flakes can be purchased for the same price as chips, plants will 

 operate most profitably on residual flakes (fig. 18-102) such as those produced 

 on the equipment illustrated in figures 18-104ABCD and 18-152. A mixture of 

 flakes and chips will yield more profit than a mixture of chips and roundwood. 



All locations should accommodate profitable mills, but the south Georgia and 

 the Arkansas-Missouri locations appear to offer greatest profit potential. Al- 

 though West Virginia is adjacent to markets that should pay most for sheathing 

 (because of high freight costs from competing regions), manufacturing costs are 

 estimated to be somewhat higher than in other southern locations, and estimated 

 profit is therefore lower. 



Best board properties will be achieved through use of precisely manufactured 

 flakes (chapter 24). With present knowledge, precisely manufactured flakes 

 cannot be cut from ordinary pulp chips or even from maxi-chips; flakes derived 

 from such chips must therefore be used only in panel cores and not in faces. 



As previously explained, a small-capacity plant (37.5 MMSF/annum) might 

 be supplied completely by residual flakes from a pallet, crosstie, post, and stud 

 mill using a 9-foot shaping-lathe headrig operating three shifts (fig 18-104D). 



Plants of all sizes could be supplied with such flakes for use in faces, supple- 

 mented with maxi-chips to be ring-flaked and used in cores. Alternatively, 

 roundwood could be processed through disk or drum flakers to yield face flakes, 

 and maxi-chips could be ring-flaked for cores. (See sect. 1 8-25 for description of 

 these flakers). 



28-28 $31.6 to $49.2 MILLION— MANUFACTURE OF 

 COM-PLY JOISTS^" 



COM-PLY joists are structural composites with sandwich construction (fig. 

 24-58) designed to serve interchangeably in size and function with 2- by 8-inch 

 or 2- by 10-inch, nominal size, sawn joists in framing floors of houses. Joist 

 lengths of 12 feet for 2 by 8 's and 14 feet for 2 by lO's are proposed for the 

 enterprise because these lengths are most commonly used by builders; COM- 

 PLY joists can be made in any length, however. Net width and depth of the 

 composite joists are the same as for kiln-dry sawn and planed joists, i.e. , 1 Vi. by 

 71/4 inches for 2 by 8's and 1 Vi by 9!/4 inches for 2 by lO's. The composite joists 

 are comprised of an oriented flakeboard core platen-pressed to 1 '/2inch thickness 

 and then ripped to widths of 5.25 inches for 2 by 8's and 6.75 inches for 2 by 

 10' s. Four parallel-laminated veneer strips for 2 by 8's and five for 2 by lO's, 

 lAinch thick and 1 V2 inches wide, are then glued to top and bottom edges of the 

 composite joists to bring them to the standard sizes of 1 V2 by IVa inches and 1 Vi 

 by 91/4 inches. 



^^ Abstracted from Koenigshof (1981). 



