Machinery maker Bekum Packaging has added two models to its current packaging machine series with a patented and proven C-frame closing unit for electrical and hydraulic closing actuators. The “multi-cavity” twin station machines of the hydraulic Hyblow series were manufactured for the high-capacity production of milk containers for a Peruvian customer.
For the range expansion, Bekum delivered a Hyblow 407 DL machine for a 12-fold production of 200ml containers with an 860mm mould width, and a Hyblow 607 DL for a nine-fold production of 1000ml containers with a 1000mm mould width.
A new screw geometry enabled the optimised processing of viscous HDPE with titanium oxide. The new design of grooved bushing, feeding zone and barrier geometry allows a 20% increase in the output, with improved service life and lower wear due to the uniform load distribution over the entire screw length. This improves the homogeneity of the compound without an additional and costly mixing component.
Around 70 to 80% of the energy used in a blow moulding machine is consumed in melting and cooling the plastic required for processing. The optimised extruder screw lowers the energy consumption required to melt the HDPE to 200 watts an hour/kg. At the same time, the drive train of the extruder is optimised so that the motor runs with the highest efficiency at a nearly optimal operating point.
In addition to the energy benefits, the machines also provide improved handling, with trouble-free production start-up, uniform extrusion of the nine-fold and 12-fold parisons, as well as reproducible article quality in terms of wall thickness distribution and weight. The aluminium moulds used by Bekum are designed for the shortest cooling times and high piece counts. Using modern, high-speed and precision article measurement technology, an immediate feedback can be given to the processing engineers and the mould maker. The efficient organisation of the interfaces between customer, mould maker and Bekum made a decisive contribution to the success of the project in Peru.