Sheet thermoplastic composites

Obtain specific properties using, for example, a self-lubricating composite insert. Discontinuous fibre reinforced thermoplastic composites can also be overmoulded onto GMT sheets. 

Recendy, storm doors have been constmcted of advanced thermoplastic composites. Stampable, glass-mat reinforced polypropylene sheet is used to create a high strength outer skin. These compression molded skins are welded together using a friction or ultrasonic process then injection molded with a polyurethane foam core to produce an insulated structure. New technology for window frames incorporate the pultrusion of frame channels to produce a thermoset composite channel that can be filled with fiber glass for further insulation enhancement (12,31,33,34,48,49,54—56,60—67). 

Mineralorganic material-filled thermoplast compositions are used in production of linoleum floor covering [12] sheets for filling cooling tower sprayers [79] technical casings, furniture fittings, etc. 

Use Acetate fiber, lacquers, protective-coating solution, photographic film, transparent sheeting, thermoplastic molding composition, cigarette filters, magnetic tapes, osmotic-cell membrane. 

Coffin, D.W. Pipes, R.B. Flange wrinkling. In The Forming of Thermoplastic Composite Sheets, AIP Conference Proceedings, Materials Processing and Design, 2004. 

In addition to the common applications of PVC in flooring and floor tiles, there are also applications of PU (coatings for flooring), polyamide (PA) (woven carpets and rugs), linoleum (manufactured by oxidising linseed oil mixed with pine resin and wood flour in the form of sheets on jute backing), wood/thermoset composites (thermosets like PE, UF, polyisocyanates used as veneers, in plywood, particleboard, fibreboard, laminates), wood fibre/thermoplastic composites (for industrial flooring with PE). 

Laminar composites are combinations of several layers of composite sheets that are bonded together. Polyolefin sandwich structures are a laminar composite. They are composed of two or more layers of polyolefin with a different material in between the layer (long fiber mat or short fiber). Sandwich panel and laminar composites are common methods for thermoset resins and thermoplastic composites. This simple method can be applied to natural fiber-reinforced thermoplastic composites using the hot press method. The addition of a reinforcement material between polyolefin layers does not require extrusion or injection molding and minimizes fiber degradation [35, 36]. 

A method of manufacturing thermoplastic composite materials by a modified film stacking process was patented [131] involving sandwiching sheets of unidirectional carbon... 

A series of works has been done in this field of growing interest for the purposes of improving the dispersibility of nanoparticles in solvents and their compatibility in polymers [25]. Mostly, the graft polymerization is conducted via two routes (1) monomers are polymerized from active compounds (initiators or comonomers). PMMA is a commonly used thermoplastic matrix for fibers, sheets, and particles. There have been several studies on PMMA-fiber composites prepared by in situ polymerization [26], solution mixing [27], or melt blending [28]. The last one is already an industrial process for fabricating carbon fiber-reinforced thermoplastic composites. 

M Ostgathe, Ch Mayer, M Neitzel. Thermoplastic Composite Sheets from Powder. Kunststoffe Plast Europe 86 13-15, 1996. 

This process has been developed specifically for thermoplastic composite plate materials. But it is also well suited for commingled fabrics, especially when they are pre-consolidated by the use of a double belt press into continuous organic sheets [8]. Further details about the thermoforming procedure are described in the chapter Thermoforming of fiber reinforced composite sheets. 

Under the general description of thermoplastic composite sheet, a number of material options exist with various forms of fibers (e.g. unidirectional, mat, knitted, woven, chopped strand, etc.) reinforcing a thermoplastic pol)oner matrix. Further to the differences in their... 

Thermoplastic composites have even more superior resistance than thermosets, sheet moulding compounds and metals (Vaidya, 2011). 

Flat laminates can be produced using the processes described in other chapters of this handbook. For example, a double belt press or compression moulding can produce the precursor laminate. Figure 5.3a shows thermoplastic composites with unidirectional fibres in each layer consolidated into a laminate with a picture frame mould. A picture frame mould goes into a hot press or autoclave and turns composite lamina into a fused precursor. To some extent, sheet forming adds cost to a final structure because a manufacturer creates two components the flat precursor and the formed structure. 

The matched die method, which appears in Fig. 5.6, can produce the highest quality parts because precision machined dies act on both surfaces of a thermoplastic composite sheet. The reader should note that there is no requirement for both - or either - of the tool surfaces to be a precision shape. The designer has two surfaces available to control forming and can use them as needed to fabricate the component. 

McGuinness, G. and OBradaigh, C. (1995), Effect of preform shape on buckling of qua-si-isotropic thermoplastic composite laminates during sheet forming . Composites... 

Okine, R. (1989), Analysis of forming parts from advanced thermoplastic composite sheet materials . Journal of Thermoplastic Composite Materials, 2, 50-76. 

Zampaloni, M., Pourboghrat, F. and Yu, W. (2004), Stamp thermo-hydroforming A new method for processing fibre-reinforced thermoplastic composite sheets . Journal of Thermoplastic Composite Materials, 17, 31-50. DOI 10.1177/0892705704038219. 

Lim T C, Ramakrishna S and Shang S M (2000) Strain field of deep drawn knitted fabric reinforced thermoplastic composite sheets, J Mater Process Technol 97 95 99. 

---