Yarn Tensioning

Step 1: Understand the mechanism described. The setup involves two plates: a fixed baseplate and a movable "weighing" plate. The yarn runs between them. The weighing plate applies pressure to the yarn, creating tension.

Step 2: Analyze the types of tensioners.
- Multiplicative type tensioner (disc tensioner): This type works by pressing the yarn between two surfaces (discs or plates). The tension is controlled by the pressure applied. The description of a baseplate and a weighing plate fits this category. The tension applied is a function of the incoming tension multiplied by a factor related to the friction and wrap angle.
- Additive type tensioner: This type adds tension by deflecting the yarn path using weighted pulleys or arms.
- Electronic tensioner: This is a broad category that can use various mechanical means but is controlled electronically to maintain constant tension.
- Roller tensioner: This type uses rollers to control tension, often by creating a specific yarn path or using braking systems on the rollers. The plate system described is the classic design of a multiplicative or disc-type tensioner.