Model 1314 Internal Bond Tester, utilizes the Scott method to produce a high speed Z- direction rupture of paper and paperboard. It is a dynamic test that measures and defines strength in terms of energy absorption.
Correlation with real-world performance
Correlation with printing and converting fail ures due to impulses, impacts and shocks is excel lent. While static tests focus on the ultimate yield value of a sample, Model 1314 responds to the semi-elastic nature of paper and board, materials that are somewhat elastic and "give" during rup ture absorb more energy and exhibit "stronger" behavior in real-world situations.
Key to correlation is speed. Most printing and converting failures occur in fractions of a second. The Internal Bond test is dynamic. The test pen dulum falls at a speed more than 6500 times as fast as a typical static test.
Wide range of applications
Ideal for monitoring the effects of dry strength additives and to evaluate stock preparation and refining. Applications include prediction of blistering of coated offset grades, picking, manufacturers flap failures, delaminations, ply separations and other shock-induced failures.
In addition to correlations with customer complaints, in-mill processing trouble-spots are of growing interest. Examples of dry-end analysis are monitoring Z-direction strength deterioration due to calendering or the application of relatively brittle coatings.
The increasing use of recycled fiber and dry strength additives in both paper and board open even more applications and create economic value for the test today. At the product research and development level, sequential photographs of the ruptures can further enhance analysis and understanding.