Contact person
Mats G Westin
Forsknings- och utvecklingsingenjör
Contact Mats G
Analysis of wood chips for pulp & paper production
The quality of the wood chips is critical to the production of pulp, and at RISE we offer several different analyses to ensure the quality of the wood chips. By carefully examining and evaluating various properties, we can identify any defects or deviations that may affect the production process and the quality of the resulting pulp.
Purpose
We analyse several key parameters in wood chips, including bark content, moisture content, bulk density and dimensions, to ensure high quality pulp production:
- Bark content: Affects pulp quality by introducing impurities; measurement indicates how well the chips have been cleaned.
- Bulk Density: Reflects the packing density of the chips and affects flowability and absorption of cooking chemicals.
- Size and thickness: Consistent size distribution and optimum thickness are essential for effective impregnation, chemical absorption and uniform cooking quality.
Together, these parameters optimise the process and improve pulp quality and uniformity.
Methods
- Dry content SCAN-CM 39:94 Determination of bark content in wood chips for the production of chemical and mechanical pulps. It is applicable for the determination of wood grade chips, preferably in conjunction with the method of chip size distribution described in SCAN-CM 40.
- Size distribution SCAN-CM 40:01 Classification of wood chips intended for the production of chemical and mechanical pulps and is applicable in determining the quality of wood chips in terms of chip size and fineness.
- Bark content SCAN-CM 42:06 Determination of bark content in wood chips for the production of chemical and mechanical masses.
Dry-Crude Density or Bulk Density SCAN-CM 46:92 Method for determining the bulk density of wood chips intended for the production of chemical or mechanical pulps. It is also possible to measure the bulk volume of wood chips, i.e. the volume of loosely packed chips. - Thickness and thickness distribution SCAN-CM 47:92 The method is applicable in determining the quality of wood chips.
Length and length distribution, width and width distribution SCAN-CM 48:01 Determination of mean length and length distribution of wood chips intended for the production of chemical or mechanical pulps (accepted chips). - Wood content in bark fraction SCAN-CM 53:94 Determination of the wood content of the bark fraction from a bark drum or from other debarking machinery. The method is applicable in the determination of wood losses in the debarking process. The total timber loss also includes breakage.
- Dry-raw density SCAN-CM 43:95 Determination of the basic density of wood chips for production of chemical and mechanical pulps.
- Metals
- Extractives
- Carbohydrates
- Ash content
Delivery
RISE provides a report containing data in Excel format and relevant images and graphs. It is carefully compiled using standard methods for the analyses carried out. The report also includes an assessment of measurement uncertainty to ensure the reliability of the results presented.
