Pulp Identification
Microscopic examination of paper pulp remains necessary to verify the species, refining state and manufacturing process of the wood fibers used in the substrate. This standard procedure is iso 9184 fiber analysis, which provides the method for identifying the composition of the paper. Utilizing this standard helps converters verify that recycled or alternative fibers do not exceed specified limits.
Staining Method
The testing method employs specific chemical stains, such as the Herzberg or Graff C stain, to color the fibers according to their cooking process. Unbleached chemical pulp, bleached chemical pulp and mechanical pulp react differently, turning distinct shades of blue, red or yellow. Analysts can then count the different fibers under a light microscope to calculate the percentage of each pulp type present.
Fiber Classification
Determining the exact fiber mix is necessary for verifying compliance with trade regulations and environmental certifications like FSC or PEFC. Since mechanical pulp is cheaper and weaker than chemical pulp, iso 9184 fiber analysis protects buyers from paying premium prices for substandard board. It also identifies the presence of unauthorized softwood or hardwood species in the paperboard, ensuring that the supply chain remains transparent.
This verification process operates as a formal auditing tool in dispute resolution between mills and packaging buyers.
