Standards Development

Scope

This document identifies and defines terms, specifies a means of classification, and gives a nomenclature of components for machine-fed woody biomass chippers, grinders and shredders used in forestry. Its aim is to establish a uniform method of describing the various configurations of these types of forestry machines.

Machines covered by this document include:

drum chippers;

- disc chippers;

- screw chippers;

- horizontal grinders;

- tub grinders;

- slow (low) speed shredders (rotational speed less than 100 rpm).

Machines not covered by this document include:

- chippers that are manually-fed;

- high speed shredders (rotational speed greater than 100 rpm).

Purpose

Following the cancellation of two projects (ISO 21116 and ISO 21119), it was agreed at the TC 23/SC 15 Plenary (September 2020) that US experts would put together a new proposal that would combine the concepts covered in ISO 21116 and ISO 21119 into a single document. This document attempts to accomplish that task.