Concept

Compression molding

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Robotic tow placement for local reinforcement of glass mat thermoplastics (GMTs)

Pierre-Etienne Bourban, Martyn Douglas Wakeman

A process has been developed where multiple yarns of commingled glass and polypropylene are heated and placed to a desired geometry. The placed unidirectional (UD) tow is then encapsulated by over-moulding with glass mat thermoplastics (GMTs). The effects ...

2002

The role of fiber bundle interaction forces in non-isothermal compression molding of thermoplastic composites

The non-isothermal flow during compression molding of thermoplastic-based composites having a planar, randomly oriented fiber structure has been investigated. Local interactions at the bundle-bundle level were measured and a constitutive equation was deriv ...

2001

The parameters affecting the packing stress of fiber mats for melt impregnation, resin transfer molding and compression molding are systematically investigated. An analytical equation based on local bending of fibers, which was previously derived for non-i ...

2001

Impregnation of compressible fiber mats with a thermoplastic resin, Part II: Experiments

Véronique Michaud

transverse direction is investigated with application to the Glass Mat reinforced Thermoplastics (GMT) lamination process in a double belt press.Amodel proposed in Part I to simulate the kinetics of impregnation and the evolution of the fiber volume fracti ...

2001

Warp-knit laminates for stampable sandwich preforms

Pierre-Etienne Bourban

Thermoforming of doubly-curved sandwich components will oer new design possibilities and cost-eective manufacturing routes. However, the occurrence of folds and wrinkles in face sheets is directly linked to the fabric architecture and constitutes a proce ...

2001

Non-isothermal process rheology of thermoplastic composites for compression flow moulding

Paul Sunderland

The non-isothermal flow rheology of a glass mat reinforced polypropylene composite for compression flow moulding has been investigated experimentally and numerically. The influence of the processing conditions on the macroscopic flow of the material was st ...

2000

The influence of the fiber mat structure and the matrix rheology on the squeeze flow behavior of thermoplastic composites for compression flow molding has been investigated. An analytical model for isothermal squeeze flow has been developed and experimenta ...

2000

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A set of new technologies to fabricate microchannels using photosensitive polymer materials is presented. They are based on the use of polymers, hereafter called photopolymers, that are cured with UV light under a mask exposure. The basic material is ail e ...

2000

The co-moulding of random-reinforced GMTs with commingled E-glass and polypropylene fabrics was investigated in a series of experiments which were designed statistically. Materials were heated in an infra-red oven prior to non-isothermal compression mouldi ...

1999

High-pressure injection molding (nominal pressure 500 MPa) is known to substantially improve the mechanical properties of high-density polyethylene of a high molecular weight (HMWPE). This work shows that if the mold is equipped with an exit cavity, the te ...

1983