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2013 | Technology review

Improved low level dosing

Maguire introduced a new carousel valve dispensing device for use with its WSB range of gravimetric blenders, designed to improve the dosing of diffi cult-to-handle materials at very low addition levels. The carousel valve mimics the action of a vibratory feeder, making it possible to dispense low addition levels of master- batch and additives from the hopper into the weigh chamber at rates of less than one gram a second. In common with all of

Maguire’s range of more than 50 dispense devices, the unit features a modular interface that enables it to be exchanged between or fi tted to any WSB model in the company’s range. 

Battenfeld demonstrates structural foam moulding with quality surfaces

Wittmann Battenfeld showed production of structural foam injection moulded parts with a high quality surface fi nish using the combination of its Cellmould system with a variotherm heat-cool moulding cycle and its HiP high precision opening function. The system, which was running on a 240 tonne all-electric EcoPower machine with Wittmann W822 part removal robot, resulted in a 30% reduction in weight while producing a part with a good foam distribution and a surface that matches compact mouldings. It was developed in partnership with Schaumform of Germany. Traditional physical gas structural foam moulding

results in a highly striated surface due to freezing of the expanding melt on the cold mould surface. The variotherm moulding cycle allows injection into a warm mould. Once the cavity is fi lled the temperature is lowered and the HiP high precision opening function initiated, allowing the polymer to expand into the enlarged

mould space. The mould temperature is then lowered to normal processing levels. According to Wittmann

Battenfeld, the combination of physical gas injection, variotherm cooling and HiP results in parts with a surface suitable for visible automotive and electrical parts 

Engel shows 700 tonne Duo for composites

Engel’s interest in lightweight technologies has seen the company look beyond its traditional injection moulding base. It showed a new vertical version of its Duo machine design confi gured for polyure- thane RTM (resin transfer moulding) at K. The company demonstrated

automated production of a composite RTM latch cover for use on the frameless wind- screen on the KTM X-Bow GT high performance sports car. The 700 tonne Engel v-Duo machine was equipped with a

50 INJECTION WORLD | January/February 2014

Viper 20 linear robot and used a linear guide mould carriage to enable simple loading of the

hybrid carbon fi bre reinforce- ment preform and unloading of the fi nished part.

Engel worked with German

composite parts maker Wethje in development of the part, which used a hybrid reinforce- ment structure of carbon fi bre surface layers around a glass fabric clutch core and a fast curing PU resin. The two platen Duo machine design is said to be well suited to the production of vertical moulding presses due to its compact mechanicals, which keeps the overall height down, and ease of access to the platen area for automation. 

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