Parkinson Technologies

Importance of Tension in an Unwind Stand - Part 1 Braking System

Many web processing applications need a way to unwind web material into a subsequent operation. Whether used inline in an extrusion laminating process or offline in a slitting and rewinding operation, an unwind stand must deliver the material into the process while maintaining the proper web tension to ensure reliable web transport. It’s the tension control requirements that can complicate the simple act of unwinding the material. 

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The Key Aspects of a Machine Direction Orienter - Part 2 Process Conditions

As mentioned previously in Part 1, to orient material we need to heat and apply a longitudinal stretching force using a series of rollers running at increasing surface speeds. Depending on the application, the MDO will be designed using a single or multi-stage stretching section. However, we need to first understand the critical process conditions: mainly how the stretch rate, stretch ratio, and the line speed influence one another and ultimately affect the results of the material being oriented.

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