Web Converting & Roll Handling Equipment
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Web Converting & Roll Handling Equipment FAQs:
Q: What is a Load Cell?
A: A load cell is a sensor that detects a force (the load) and outputs an electrical signal. A strain gauge or multiple strain gauges are attached to the object for which load will be detected. As the object is subjected to stress by a load, it deforms, causing the strain gauge to deform with it. The deformation (strain) changes the electrical resistance of the strain gauge. The load cell has the gauge in a Wheatstone bridge configuration (four resistors arranged into two parallel branches each having two resistors in series). A load cell may use a strain gauge as each of the four resistors in the bridge or as only two (half bridge) or one (quarter bridge) of the resistors. The bridge is balanced (no output voltage) when the ratio of the resistances in one branch equal the ratio of the resistances in the other branch. Read More
Q: What is a Safety Chuck?
A: A safety chuck is a specialized quick coupling used for web handling operations. In order to maintain the desired tension in a web, a shaft from which a roll is being unwound must be subject to a constant level of torque from a tension brake. Similarly, a shaft onto which a roll is being wound must be subject to a constant level of torque from a motor via a slip / tension clutch. A safety chuck provides a means to transmit torque to a roll shaft as well as the ability to switch roll shafts quickly and conveniently. Unlike most couplings, a safety chuck does not require loosening and tightening of screws or moving any component other than the shaft and the chuck itself. Tension brakes, clutches, and motors need not be moved or dismounted. Read More
Q: What is a Tension Controller?
A: A tension controller is a controller device which monitors and adjusts web tension to maintain desired operating conditions. Monitoring is done via load cells, and adjustment is achieved through brakes, motors, and clutches. The load cells, brakes, motors, and clutches are attached to the shafts which guide, wind, or unwind the web. Read More