Mandrel velocity

Mandrel Speed Manipulation The speed of the mandrel determines the rate of fiber lay down. To control angular velocity, a proportional control algorithm was programmed... 

PU LS Em AN REF is the position of the mandrel at the start of each carriage pass. RPM is the angular velocity of the mandrel. 

Cross-file patent searches, 18 243-244 CrossFire Beilstein, 6 19 Cross-flow filtration, 11 383 15 827, 829 in porous pipes, 11 387-388 with rotating elements, 11 383-387 Cross flow model, 21 706 Cross-flow packed scrubber, 26 687-688 Crossflow plates, 6 762-763 Cross-flow screens, 22 282 Cross-flow velocity, 15 725 Crosshead mandrel, in VDC film extrusion, 25 732-733 Cross-lapping, 17 501 Cross-linkable epoxy thermoplastic system (CET), 10 436... 

It is possible to avoid the contact of Cl with the heated surface of the mandrel if it, or its solution in PI, is poured off on the inner surface of the hose at a velocity similar to the extrusion rate from the height of the polymer setting line [78]. It appears that the hydrostatic pressure of the draining liquid is much less than the hose strength at any height of its feeding, so the liquid will not break the hose. The Cl flow velocity correlated with the extrusion depends on its viscosity, density and adhesion to the hose in the viscous-flow state. 

It is not always possible to elevate the liquid level fed to the extrusion head mandrel and escape high hydrostatic pressure (see Fig. 2.5e) lest the hose should rupture. To avoid this, the Cl is applied on the hose wall during rotation [98]. The liquid vortex formed this way promotes the required level of the liquid on the mandrel near the hose surface, making use of a minimum amount of Cl and changing the rotation velocity of the hose. The dynamic interaction of the hose and the Cl intensifies its diffusion into the polymer material, breaks the vapor jacket at the inhibitor-hose interface and facilitates the uniform distribution of Cl pressure, minimizing the probability of hose rupture. 

This process has been studied for some time and the effect of viscoelasticity on bubble shape, velocity, and stress are still being explored. Some simulation of the flow in the spiral mandrel has also been performed. ... 

To evaluate the braided materials properties three references have been investigated, Ref-55, Ref-45 and Ref-35. The structure was braided layer by layer upon a tubular mandrel with a 50-mm diameter. Four layers were braided on the same mandrel for each reference. The spools rotational velocity was held constant during braiding. As the braid was made of several layers, the thickness of each layer increases the apparent diameter on which the next layer will be braided. For this reason, the take-up speed was adjusted in order to keep the same braid angle from one layer to the next. According to the yam count, tubular mandrel geometry and braiding parameters, the cover factor [40] obtained is close to 100%. 

In Fig. 7.2 a thermoplastic filament winding process consisting of a material rack, a tension controller, a preheating zone, a main heater, a consolidation roller and a mandrel is shown schematically. Beside the material used, the most adjustable process parameters are winding velocity (which is defined by mandrel rotation and crosshead movement), roving tension, temperature, winding angle and mandrel/liner (material and temperature control). 

Relevant quality factors for components made out of fiber reinforced plastics are consolidation degree, void content, residual stress, degradation, fiber breaks and inhomogeneous fiber matrix distribution. These factors are influenced by the winding velocity, heating, tension, mandrel material, cooling rate and the number of layers, that is, application thickness. ... 

The filament winding technology was used to produce flat or cylindrical composite structures. The flat panels were produced using a flat mandrel with a 25 pm MELINEX film inserted at half-thickness to generate the starter crack needed for ENF tests. Pipes for low velocity impact tests were produced using a more conventional tubular mandrel. For each of the above mentioned composite structures three types of raw-materials were used a conventional glass polyester system,... 

---