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Rediscovering structural foams in injection moulding

The influence of processing conditions on the aesthetical, morphological and me...

The production of large plastic parts, in small series and at low cost, requires the development of alternative tools and materials. Structural foams (SF) are a good solution, when the production of thicker parts with good properties is the specification. They allow obtaining lightweight parts with high stiffness and good dimensional stability, due to their sandwich-like structure constituted by a cellular core...

Studies on the mouldability of structural foams in hybrid moulds

In the context of the research project Hybridmould 21, studies on the mouldability of structural foams using hybrid moulds have been carried out. Hybrid injection moulds are an increasingly considered alternative for prototype series or short production runs of large dimension parts. In this solution for injection moulds the moulding elements (blocks or other inserts) are manufactured in alternative metallic ma...

Semi-automatic laboratory equipment for reactive injection molding

Traditional melt processing techniques limit in shape and thickness the parts of fiber-reinforced thermoplastic composites. Producing of thermoplastic hybrid composites through melt intercalation often results in heterogeneous products due to micron-scale agglomerations with a negative effect on the mechanical properties. The in-situ polymerization processes to form the matrix in polymer composites have proved ...

Morphological characterization of injection molded parts in Ren Shape 5166 poly...

The Rapid Tooling techniques have been emerging to produce rapid moulds for injecting plas-tics parts. Among the current solutions, material removal by milling machining of polymeric resin or poly-meric composites is an attractive alternative for manufacturing moulds for injecting short series of products. This work assesses the morphology of parts injected in mould cavities manufactured by a polyurethane resin...

Rapid prototyping and tooling in the manufacture of mould elements for large parts

In the last two decades the advances in rapid prototyping and tooling (RPT) technologies made possible the use of materials alternative to steel in some mould components. They also have allowed novel fabrication strategies and new ways of thinking on the production of injection moulds for short series of plas-tics parts. These technologies induced a new generation of toolmaking techniques. In the scope of the d...

Effect of the micromoulding process conditions on polymer flow behavior within ...

Fast time to market along with high level of automation and versatility made microinjection moulding, by far, a favorite technique for the mass production of microplastic components. In the microimpressions, very high shear rates develop, eventually leading to excessive shear heating and consequently to less predictable flow behaviour comparing to conventional injection moulding. In this study, the flow behavio...

Study of the processing and properties of mixtures of recycled plastics for out...

There is an industrial need for the study of the mechanical and physical properties of recycled polyolefins mixed with cellulose fibres from diapers, wood and packaging containing aluminium. The recycling of thermoplastic based residues is economically very interesting for the easy reprocessing of these materials and flexible shaping using conventional moulding processes as injection moulding or intrusion. Va...

Making an impact with nanocomposites

Nanoclays can improve the performance of injection-molded polypropylene components likely to be subjected to impact in service

Is there any chance for polypropylene/clay nanocomposites in injection molding?