Analysis of Wood Chips for Paper Production and 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, influencing flowability and the absorption of cooking chemicals.
• Dimensions and thickness: Consistent size distribution and optimal thickness are crucial for effective impregnation, chemical absorption, and uniform cooking quality.

These parameters collectively optimise the process and enhance the quality and uniformity of the pulp.

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 offers a report that includes data in Excel format and relevant images and diagrams. It is carefully compiled using standard methods for the conducted analyses. The report also includes an assessment of measurement uncertainty to ensure the reliability of the presented results.