Mandrel rotation

Multiple passes of carriage necessary to cover mandrel. Programmed relationship between carriage motion and mandrel rotation necessary. Reversal of carriage must be timed precisely with mandrel rotation. Dwell at each end of... 

Figure 13.6 Multiaxis winder with dual carriages. Axes of motion include 1. mandrel rotation 2. carriage traverse 3. radial motion 4. vertical motion 5. eye rotation and 6. yaw (pitches the wind eye in a 90-degree plane) (courtesy of Engineering Technology, Inc. ENTEC )...

This type of winding (Figure 21.60) is used to wind most axial fibers for domed pressure vessels. The arm rotates about a vertical axis and can be set to different angles of tilt. Gearing provides mandrel rotation relative to the arm. 

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). 

The number of axes used has grown over the past years. At the beginning two axes (mandrel rotation and winding head) were sufficient for a winding process. Nowadays six and even more axes are used to enable a highly accurate winding and allow the winding of more complex shapes, for example a pipe T-joint. 

Third axis Z Distance between the payout eye and the mandrel rotation... 

In the tumble-type winder (Fig. 22), the mandrel is tumbled end over end during a polar wind, whereas the feed eye is traversed and the mandrel rotated in the normal lathe-type fashion for helical or circumferential winds. This type is widely used for high volume commercial products such as water-softener tanks and pool filter tanks. 

Mandrel rotational speed TowpiegN liil- PCTs ipin 30... 

Different mandrel rotational speeds, consolidation pressures, and preheating and consolidation temperatures were used to manufacture pipes from towpregs and to verify the influence of these processing parameters on the mechanical properties. The circumferential tensile strength of the pipes was tested in an Instron 4505 machine using the split disk test method according to ASTM 2290 at a crosshead speed of 1 mm/min. 

Figure 14. Influence of mandrel rotational speed on pipe strength for various preheating temperatures (tow tension = 10 N consolidation temp. = 300 °C consolidation pressure = 200 kPa).

We seek to produce a multilayered film of two polymers from a coextrusion blown film apparatus. The die is of the annular type with the mandrel rotating (see Fig. 6.31a) and its dimensions are kR = 4.8 cm, R = 5.0 cm, and L = 15 cm. The two polymers, which are presented in the schematic by black and white colors, have the same Newtonian viscosity, fj, = 500 Pa-s, at the extrusion temperature. The pressure drop in the die is AP = 3.45 MPa (500 psi) and the total volumetric flow rate is Q = 9.43 cm /s. The feedport system consists of 20 equal-size ports in total, 10 for the first polymer (black) and the other 10 for the second polymer (white). A similar feedport system with 16 ports in total is shown in... 

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