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Title: Potential for yield improvement in combined rip-first and crosscut-first rough mill processing
Author: Thomas, Ed; Buehlmann, Urs.;
Source: BioResources 11(1): 1477-1493.
Publication Series: Scientific Journal (JRNL)
Description: Traditionally, lumber cutting systems in rough mills have either first ripped lumber into wide strips and then crosscut the resulting strips into component lengths (rip-first), or first crosscut the lumber into component lengths, then ripped the segments to the required widths (crosscut-first). Each method has its advantages and disadvantages. Crosscut-first typically works best for the production of wider components, while rip-first favors the production of narrower and longer components. Thus, whichever type of processing method is selected for a given rough mill usually depends on the characteristics of the cutting bills the mill expects to process. There is a third option, a dual-line mill that contains both ripfirst and crosscut-first processing streams. To date, such mills have been rare for a variety of reasons, complexity and cost being among them. However, dual-line systems allow the mill to respond to varying cutting bill size demands as well as to board characteristics that favor one method (rip-first or crosscut-first) over the other. Using the Rough Mill Simulator (ROMI 4), this paper examines the yield improvement potential of dual-line processing over single-system processing (i.e., rip-first or crosscut-first processing alone) for a variety of cutting bills and lumber grade mixes.
Keywords: Rough mill lumber yield, Cut-up systems, Rip-first, Crosscut-first, Performance
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Thomas, R. Edward; Buehlmann, Urs. 2016. Potential for yield improvement in combined rip-first and crosscut-first rough mill processing. BioResources. 11(1): 1477-1493.
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