Mechanical Refining Impact on Multi Ply Boxboard Z Direction Tensile Development
Controlled low energy refining of middle ply mechanical pulp yields superior Z direction tensile development without caliper loss in multi ply boxboard.
Double Sided Tape Rheology
Deformation Science
Viscoelastic properties of pressure sensitive adhesives govern how bonding agents respond to applied forces over time. Understanding double sided tape rheology is necessary for predicting how a splice will behave under the high tension of a web offset press or a flexographic printer. The study focuses on the liquid flow and elastic recovery.
Flow Characteristic
Adhesives must flow into the microscopic valleys of the paper surface to create a strong mechanical bond. If double sided tape rheology favors high viscosity, the material might fail to wet the surface properly during a high speed flying splice. Shear thinning behavior allows the adhesive to become less resistant to flow when the tape is pressed against the substrate, only to regain its firmness once the pressure is removed.
The recovery ensures that the adhesive does not ooze out from the edges of the reel during storage or transport. Modern formulations use synthetic polymers to tune these flow curves for specific environmental conditions like heat and humidity. Quality control teams use rheometers to map these properties before a product is approved for use on a production line.
Storage Impact
Temperature changes alter the internal structure of the adhesive layer. Cold conditions make the tape brittle, while excessive heat leads to softening and premature failure of the bond. Testing verifies that the rheological profile remains stable across the expected shipping window.