Paperboard Hydrocarbon Extraction and LC-GC-FID Analysis Protocols
Paperboard LC-GC-FID testing requires ethanol swelling, mCPBA epoxidation, and accurate UCM baseline integration to verify MOSH and MOAH migration compliance.
Squalene Removal
Chemical Filtration
Chemical purification involves the reduction of lipid-derived compounds from reclaimed paper pulp stocks to maintain structural integrity and visual cleanliness. Squalene removal targets these specific hydrocarbon chains to prevent yellowing and adhesive failure during secondary processing. High levels of these unsaturated oils interfere with the bonding strength of sizing agents and starch coatings.
Specialized washing stages effectively extract these hydrophobic molecules before the fiber mats enter the final bleaching sequence.
Process Mechanics
Mechanical separation relies upon the differential solubility of long-chain hydrocarbons within surfactant-rich aqueous solutions. Squalene removal utilizes temperature-controlled froth flotation cells where air bubbles carry the non-polar contaminants to the surface for skimming. Increasing the dwell time in these flotation zones enhances the recovery rates of stubborn residues trapped between cellulose fibrils.
Constant monitoring of surface tension allows operators to adjust dosing rates for optimal contaminant extraction.
Production Consequences
Persistent organic residues inhibit the uniform application of barrier coatings on recycled linerboards or food-grade folding cartons. Squalene removal serves as the gatekeeper for sheet smoothness and prevents the formation of translucent grease spots that degrade overall print quality. These invisible defects frequently emerge during high-speed heat-set printing when latent lipids liquefy and disrupt ink film formation.
Achieving consistent reduction thresholds remains necessary for high-value packaging applications.