Maximum Wood Yield

A typical example for practical cutting problems is the problem of minimizing waste in sawmills, where boards of different grades and different dimensions are cut from logs.

Production of Construction Timber in the Timber Industry

In the production of construction timber, the raw product undergoes various processing and refinement stages, which end in its being broken down into ready-to-sale products.

Technological, geometric and monetary aspects have to be taken into account for this process. It is not always possible to convert the blank completely into products, but rather to produce unusable waste, which must be minimized.

The raw material efficiency of a sawmill depends largely on the cutting patterns used. Because:

  • In log cutting, good cutting patterns guarantee optimum utilisation of the logs cut.
  • During the compilation and cutting of stock goods according to individual customer requirements good cutting patterns reduce the quantity of unusable remnants (waste).

In addition, as in many other manufacturing companies, bottleneck resources must also be optimally allocated. Depending on the additional finishing steps to be carried out, drying chambers and presses can also be bottlenecks.

When loading drying chambers and presses, the focus is on optimum sequences for minimizing set-up times and optimum packaging for maximizing production volume.

 

Software Helps with Production Planning

We have developed software tools for our customers in the timber industry that support them in their daily production planning.

  1. One component calculates different, alternative cutting patterns for round timber cutting. The software interprets the cutting problem as a multi-criteria optimization problem and considers both technical and commercial aspects.
  2. A second component optimizes the processes in gluelam plants and calculates optimal production sequences, press allocations and minimum waste picking orders.