Small Moulding

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Large Moulding

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Mould Making Stage 3

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Mould Making Stage 2

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Mould Making stage 1

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Pure, yet another woven polypropylene sheet product

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From the website of Lankhorst Pure Composites Bv:

PURE® is a patented 100% polypropylene composite material, thus a mono material concept which is fully recyclable. The PURE® tapes are co-extruded and consist of a highly oriented, high strength and high modulus core and a specially formulated skin on both sides for welding the tapes together in a compaction process using a hot-press or continuous belt press.

The picture above shows schematic the processing step of PURE®. This process of co-extrusion and tape welding has enormous advantages over conventional sealing processes because of the large sealing window (130-180 °C) without loss of material properties.

The tape can be woven into fabric and subsequently sheets can be made from this fabric by sealing them together. Parts can be produced by thermoforming from sheets or directly from fabric.

The properties of PURE®

PURE® material has a high stiffness and low density (0.78 g/cm3; for comparison: GMT 30% glass is 1.1 g/cm3). The combination of these two properties makes PURE® an interesting option for construction, automotive and consumer products.

PURE® material gives excellent properties with respect to impact resistance, even at very low temperatures. The material shows a “soft” (safer) crash behaviour. PURE® does not splinter but fails in a more ductile manner. Such a “soft” crash behaviour is of significant interest for various applications, since it will lead to safer products. Also in blast-protection PURE® shows an excellent behaviour.

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Alternative Samsonite construction

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I came across this older Samsonite case that had a very different form of construction in that the two moulded halves had mating profiles, i.e. a male and a female side. The owner of this case thought it was about 10 to 12 years old, and it is the only suitcase I have seen whose construction is different to that with zips and fabric hinge.

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