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Injection moulding from a single source, for parts from 0.02 to 1,500 g.
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New technology
A plastic carabiner strong enough to hold its own next to aluminium. Inside, a bent carbon reinforcement carries the tensile load, the plastic provides the shape.
The carabiner is a two-component part made of short-fibre-reinforced polyamide. Embedded in it are bent profiles of continuous-fibre-reinforced plastic: a round profile in the highly loaded core, a flat profile at the edge.
Unidirectional carbon rovings and a thermoplastic matrix are formed into wire-shaped semi-finished products.
Local heating and cooling combined with machine wire forming turn the semi-finished products into three-dimensional rebars.
The reinforcement sits in the injection mould of the carabiner, exactly along the load path.
The plastic encloses the reinforcement, protects it and turns it into a load-bearing part. The filling study shows it step by step.
Twice the load capacity of unreinforced plastic, around 1,400 N in simulation.
1,400 NMaximum load with Rebar, instead of 680 N without
Simulation, same design
Twice the load capacity of unreinforced plastic, around two thirds of the aluminium load capacity at roughly half the weight.
K-Zeitung presents the carabiner demonstrator: in simulation, the reinforcement doubles the maximum load and cuts the displacement to a quarter. Ronald Müller explains why a carabiner forgives no design errors and where replacing metal saves weight and CO₂.
Read the article in K-Zeitung (German) (opens in a new tab)
