436 JOURNAL OF FORESTRY 



Waste can best be handled as it is to the ordinary lath mill — by 

 arranging for the refuse conveyer to pass through the mill and from 

 it to pick off and sort over the waste w^hich is desired. Planing-mill 

 waste, if used, can be brought in on trucks or by a conveyor, as is 

 convenient. 



One disadvantage of this arrangement is that all material must 

 pass through the slasher, and thus often be cut to very poor advantage. 

 To obviate this a special arrangement, adapted to mills not cutting 

 more than 35 M, is in use. The slasher is entirely done away with — 

 in its place is set a table onto which refuse from the slasher is deposited. 

 A jump saw operates across this table. From it lead two conveyors, 

 one to the burner and the other to the by-products factory. Two men 

 operate this- saw and are supposed to cut into convenient sizes all 

 waste which is suitable for by-products and slash up the rest, so 

 that it will easily pass through the refuse conveyor to the burner. 

 Trimmer waste passes directly onto the waste conveyors. 



When the burner and the by-products mill are situated on the same 

 side of the plant the two conveyors can run through the latter side 

 by side so that any material wrongly classified can easily be transferred 

 from one to the other. A conveyor can carry trimmer waste direct to 

 the by-products mill. 



Since two men cannot handle the waste from a mill of more than 

 35 M, this use of a trim saw, in place of a slasher, cannot be adopted 

 in mills exceeding that capacity, without modifications permitting the 

 use of more than one saw. By lengthening the live rolls from the 

 band mill past the chains running from the edger, a second saw could 

 be added and the use of a slasher thus be dispensed with in large mills. 



At the factory, stock is sorted from the lengthwise conveyor. Stock 

 of inferior grade or wood is placed on the lath conveyor. Slabs go 

 to the carriage bolter, short boards or edgings to the rip saw or bolter. 

 The carriage bolter rips slabs into short boards or edgings, as desired ; 

 they then go to the rip saw, or the bolter, and finally to the trim saws, 

 after which they are graded and sorted and sent to the yard to season, 

 generally under cover. This seasoning process requires from 60 to 90* 

 days. Material is then ready for shiprnent to factories, although, if 

 the plant is run in conjunction to a planing mill, short boards may be 

 resawed for veneer or box shook stock or any other product requiring 

 thin pieces. 



One very great advantage of this form of waste utilization is that 

 it does not necessarily require planing-mill or dry-kiln equipment, 



