Wrap tension

Figure 17 Material flow through an S -wrap tensioning device. This type of tensioning device may consist of two or more tension rolls, depending on the final tension requirements.

Embedded. Rectangular-cross-section aluminum fin which is wrapped under tension and mechanically embedded in a groove 0.25 0.05 mm (0.010 0.002 in) deep, spirally cut into the outside surface of a tube. 

Overlapped footed. L-shaped aluminum fin wrapped under tension over the outside surface or a tube, with the tube fully covered by the overlapped feet under and between the fins. 

A molecule of a liquid attracts the molecules that surround it, and, in its turn, it is attracted by them (Figure 1.2). For the molecules that are inside a liquid, the resultant of all these forces is neutral, and all of them are in equilibrium by reacting with each other. When these molecules are on the surface, they are attracted by the molecules below and by the lateral ones, but not toward the outside. The resultant is a force directed inside the liquid. In its turn, the cohesion among the molecules supplies a force tangential to the surface. So, a fluid surface behaves like an elastic membrane that wraps and compresses the liquid below. The surface tension expresses the force with which the surface molecules attract each other. It is common observation that, due to the surface tension, it takes some effort for some bugs to climb out of the water in lakes. On the contrary, other insects, such as the marsh treaders and water striders, exploit the surface tension to skate on the water without sinking (Figure 1.3). 

Hand Grenade and 12 blocks l A" by %" of 66.6/33.3—RDX/A1 compn, each wrapped in waxed paper. It could be used as an A/Tk Mine when fuzed with an armed grenade or as an A/P Mine or Booby Trap when armed with pull or tension detonator (p 219, Fig 165) Air-Strip Land Mine consisted of 31 100-kg bombs stacked around PA blocks in which electrical detonators were inserted. The ensemble was under a turf-covered piece of sheet iron that would close the circle and fire the charge if the iron were lifted or depressed. A clockwork was also inserted to fire the chge if the iron were not depressed (p 220, Fig 166, upper half)... 

The tension is clearly perennial. One approach to resolving this tension, at least for many textbook authors, has been the encyclopedic approach, in which modern material is wrapped around the old friends from the successful past. The decisions about what to include in a particular course can then be left to individual instructors. In this chapter I propose an alternative solution to the dilemma, in which recent advances provide the context within which the timeless fundamentals are developed, rather than becoming additional material through which both instructor and student must navigate. 

Wrapped cure - A vulcanizing process using a tensioned wrapper (usually fabric tape) to apply external pressure. 

Such a shape is derived from the curve obtained by the end of a string wrapped around the circumference of a stationary cylinder and being unwrapped under tension. 

Where still used, cold drawing consists essentially of removing the yam from the package prepared in the melt spinning operation and feeding it forward at a uniformly controlled rate under low tension. It is passed around a godet or roller that determines the supply rate and prevents slippage for nylon 66, it then is wrapped several times around a stationary... 

Wrapping. In [66] it was shown that the interface may wrap around the sphere when the surface tension of the interface is decreased sufficiently and/or the repulsive force is sufficiently strong that a separation distance D can be found satisfying... 

For y > yt. no wrapping distance D can be found and Do can be decreased below Dmax by advancing the stage. Thus the attractive component of I1(D) can be sampled in this case and a jump-in is observed. For higher surface tensions the jump-in is marked by the arrows on the curves in Figure 4.8 (right), but as the surface tension decreases and the... 

Stretch wrapping is the method of unitizing and protecting pallet loads or groupings of individual containers of product by applying layers of plastic film. The film is mechanically stretched to increase its yield and create a tension force around the load. 

---