Pin Adhesion Test

Manufacturing Calibration

Corrugator operators monitor this result to optimize starch consumption and heat transfer during the formation of the board. High bonding values correspond to deep penetration into the fibrous matrix of the linerboard, whereas low values indicate a starved glue line or premature drying. Variations in moisture content within the medium alter the tackiness of the applied adhesive during the instant of flute formation.

Production lines adjust the pressure exerted by the pressure roll to ensure uniform contact across the entire width of the web. Maintaining consistent settings prevents board separation during subsequent converting operations like die cutting or folding.

Performance Expectation

Structural performance of packaging relies upon the uniform distribution of loads across the flute structure, and this requires consistent bonding at every connection point. Failure at the bond interface allows the flute to collapse under external compression, which decreases the stacking strength of the finished container significantly. A corrugated board that retains high adhesion levels throughout its shelf life supports weight more effectively than a poorly bonded sheet.

Increased speed on the corrugator often puts pressure on the drying cycle, which can reduce the depth of the starch bond if the heat is insufficient for the speed of the run. Substrate selection impacts this adhesion, because porous liners absorb starch differently than coated or high density options. Proper testing of these bonds provides a quantitative limit for assessing the quality of incoming raw materials or the consistency of the converting process.