Extruded polypropylene

Honeycombs are structures with hexagonal or cylindrical cells made from thin sheets of aluminium, aramid (Nomex), paper or extruded polypropylene. The dimensions of the cells are generally in the range of 5 mm to 10 mm. The two faces are covered with a firmly adherent composite (or sometimes metal) skin. 

Figure 6.12 shows an example of a sandwich panel made from an extruded polypropylene honeycomb core (from Tubulam, Bagneux, France). 

Brookfield, Ct., 2002, Session I, p.1-8. 27cm, 012 LOW DENSITY EXTRUDED POLYPROPYLENE FOAMS - ONE OF THE FINAL FRONTIERS Folland R Reichelt N Stadlbauer M Borealis Polymers NV Borealis GmbH (SPE,Thermoplastic Materials Foams Div. ... 

Antec 96. Volume II. Conference proceedings. Indianapolis, 5th-10th May 1996, p.1941-7. 012 EFFECT OF BRANCHED STRUCTURE ON THE CELL MORPHOLOGY OF EXTRUDED POLYPROPYLENE FOAMS. I. CELL NUCLEATION... 

TABLE 1. Effect of Selected Additives on Crystallinity and Haze of Extruded Polypropylene... 

FIGURE 3.65 Modulus versus deformation ratio for hydrostatically extruded polypropylene. (From Williams, T. / Mater. ScL, 1973, 8, 59. With permission.)... 

Macauley NJ, Harkin-Jones EMA, Murphy WR (1997) The influence of regranulated material on the mechanical properties and thermoformabiUty of extruded polypropylene sheet. J Plast Film Sheeting 13 126-141... 

For example, if an intermeshing co-rotating twin-screw extruder extrudes polypropylene resin at a specific energy of 600 J g , and the measured discharge temperature of the polypropylene melt is 260 C, then about 120 J g must have been transferred out through the barrel wall as an energy flux. 

Draw resonance n. A phenomenon occurring in film and filament extrusion in which the extrudate is drawn into a quenching bath at a certain critical speed that creates a cyclic pulsation in the cross-sectional area of the extrudate. The pulsation increases with rising drawing speed until the filament or film eventually breaks at the bath surface. Draw resonance has been observed while extruding polypropylene, polyethylene, and polystyrene. 

Being a general-purpose plastic, polypropylene has found applications in almost every field in which plastics are used. Polypropylene has found wide use in the textile industry, where it is successfully competing with rayon and other synthetic fibers as well as the natural fibers. This is particularly true in the carpet industry. The largest use of extruded polypropylene is in thin-film packaging. 

Akay, M. and Barkley, D. (1983) On-line characterization in the quality control of extruded polypropylene film. Proceedings of the 3rd International Conference on Polypropylene Fibers and Textiles III, York, October 1983, Plastics and Rubber Institute, London, 14-1-11. 

Cabrera N O, Alcock B and Peijs T (2008) Design and manufacture of all-PP sandwich panels based on co-extruded polypropylene tapes. Compos Part S 39 1183-1195. 

L. Zhu and M. Xanthos, Effects of process conditions and mixing protocols on structure of extruded polypropylene nanocomposites. Journal of Applied Polymer Science, 93 (2004), 1891-9. 

SK Satija, CH Wang. Polarized Raman scattering studies of chain orientation in hydrostatically extruded polypropylene. J Chem Phys 69 2739-2744, 1978. 

CH Wang, DB Cavanaugh. Effects of chain orientation of Raman and Brillouin scattering spectra of hydrostatically extruded polypropylene. J Appl Phys 52 6003-6007, 1981. 

Figure 6.10 The variation in phase angle with distance along a polyethylene monofilament for transmission of sound waves at 3000 Hz. (Reproduced from Chan, O.K., Chen, F.C., Choy, C.L, et al. (1978) The elastic constants of extruded polypropylene and polyethylene terephthalate ]. Phys. D, 11, 617. Copyright (1978) Institute of Physics.)...

Influence of cooling rate on the weathering resistance of extruded polypropylene plate [591]... 

An extruded polypropylene film is stretched first in the machine direction, followed by a second stretching in the transverse direction. The resulting material shows highly orientated crystallites and no, or very little, spherulitic superstructure, which results in the film having both a higher Young s modulus and transparency. 

Naguib, H. E., C. B. Park, and N. Reichelt. 2004. Fundamental foaming mechanisms governing the volume expansion of extruded polypropylene foams. J Appl Polym Sci 91 2661-8. 

Extrusions Extruded polyethylene Extruded polypropylene Extruded polystyrene Extruded PVC Hot knife welding... 

Van Gheluwe, P., B. D. Favis and J.-P. Chalifoux. 1988. Morphological and Mechanical Properties of Extruded Polypropylene/Nylon-6 Blends. J. Mater. Sci., 23, 3910-... 

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