machinery feature | Extruder developments Trelleborg first saw the technology in action at a
KraussMaffei open house event, and signed the purchase order for the two lines at K2013. The reason for its investment was to reduce operating costs in the energy-intensive vulcanization process. “In view of the results – in terms of productivity and quality – we decided to opt for this solution to further increase our vulcanization productivity,” said Joakim Hansson, purchasing manager at Trelleborg. Four microwave channel modules are each equipped with a generator of 6kW magnetron power. A circulator integrated into the energy supply transfers any energy not absorbed by the product to the connected water load, to improve magnetron service life. The channel has a total installed magnetron power
Tien Phong will become the first Vietnam- ese company to make 2,000mm PE pipe when its Battenfeld- Cincinnati line begins next year
designed to be more compact – as we had to take the limited ceiling height into account.” The extruder is coated with thermoplastics and
additives, which must be melted on the front part of the 50-D-long processing unit. A side feeder meters the wood flour that is not pre-dried. Two degassing units extract the humidity – which can reach up to 12%. Together with atmospheric degassing, a water ring pump ensures that high steam levels are dissipated. Combined with the high level of free screw volume, the 6-D-long venting port with special WPC inserts ensure that humidity is removed effectively. KraussMaffei Berstorff has installed three produc- tion lines with co-extruder combinations for WPC processing – combined with tools and downstream units supplied by Greiner Extrusion. “We are using two co-ex combinations with a KMD 90-32/WPC main extruder and a KME 38-30 B/R co-extruder, which were designed on columns as it is easier to position and more flexible to handle with the main extruder,” said Peter Oswald, head of product management at KraussMaffei Berstorff in Munich. This combination produces the main window profile,
while additional profiles are produced on a third combina- tion consisting of a KMD 75-26/WPC and a KME 38-30 B/R. The window profile is later encased in a thin layer of aluminium on the inside and outside, which makes the window resistant to extreme weather conditions.
Microwaved seal Trelleborg, a Swedish producer of sealing profiles for the automotive and building industries, has begun using two EcoLine microwave channels from KraussMaffei Berstorff.
20 PIPE & PROFILE EXTRUSION | October 2014
of 24kW. The microwave generators are arranged above and below the conveyor belt. The microwave coupling system is designed to ensure a homogeneous field distribution. Both the microwave power and conveyor belt speed can be continuously adjusted. The microwave channel has an effective cross-section of 280mm width and 150mm height. A central control panel ensures that system settings
can be selected with ease. A process-oriented user interface helps to reduce set-up times during material changes.
“Special features of the EcoLine microwave channel
are reduced waste gas losses and the energy-optimised switched-mode power supplies,” said Helmut Lüders, product manager for rubber profile production lines at KraussMaffei Berstorff. “Closed circulation of the process air provides maximum cost savings, as 90% of the energy-intensive hot air remains in the system.” Another new feature is improved thermal insulation of the process chambers, he said.
Vietnam debut Tien Phong is to become the first company in Vietnam to make PE pipe with external diameters of up to 2,000mm. The state-owned company, based in Haiphong,
makes PVC, HDPE and PP-R pipe. Early next year, it will start making the new large pipes on a line supplied by Battenfeld-Cincinnati. “Our pipes are manufactured to international
standards, which is why we pay special attention to the quality of our production lines: we are already operating several lines from Battenfeld-Cincinnati,” said Nguyen Quoc Truong, Tien Phong’s general director. The main components of the new line – which will
make pipes of 630-2,000mm diameter – are a SolEx single screw extruder, Helix VSI-T+ pipe die and EAC drying system. With their processing length of 40 D, SolEx extruders
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