Product category:
Special purpose moulding machines and systems
News Release from: Krauss-Maffei (UK) | Subject: Mixing and metering systems - PUR
Edited by the Manufacturingtalk Editorial
Team on 14 April 2008
Mixing and metering systems boost
productivity
Krauss-Maffei said that many PUR applications, like sealing beads, require metering and mixing small volumes of material and a high pressure process offers higher productivity.
A lot of PUR applications require metering and mixing small volumes of material, said Krauss-Maffei Typical examples are sealing beads, adhesive systems or casting
This article was originally published on Manufacturingtalk on 11 Jun 2001 at 8.00am (UK)
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Output is sometimes under 10g/s.
Up to now, processing these very small volumes has only been possible with low-pressure processes.
* High pressure system - KraussMaffei offers a range of high-pressure mixing heads and metering systems for processing these very small throughput volumes.
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Previously, small-volume applications only used low-pressure PUR technology; now KraussMaffei is opening up the benefits with, e g, increased productivity, of PUR high-pressure technology.
The small-volume TwinComet metering system uses a metering piston instead of pumps.
The system offers high precision and constant component pressure even for very low throughput rates, said Krauss-Maffei to manufacturingtalk.
The metering system can handle a very wide viscosity range and is also suitable for abrasive materials.
The TwinComet metering system is works with the MK 3,5/5UL-2KVV microvolume mixing head, designed for super-efficient mixing of small component volumes (as low as 5g/s) and a steady, uniform pour of the PUR mix.
The TwinComet metering system can also be combined with other KraussMaffei mixing heads, opening up the option of spraying small PUR volumes, e g, for skins or coatings.
* Higher availability for lower investment - Krauss-Maffei said that a major advantage of high-pressure technology is the ability to process fast-reacting systems.
The PUR cures faster, so that there is no delay before the parts are ready for post-mould processing.
There's no need for the 'buffer zones' normally required to allow time for slow-reacting systems to cure.
This means a lower initial investment and tighter space planning for the production area.
With low-pressure systems, the mixing chamber needs to be cleaned regularly, generating waste that has to be disposed of and interrupting production.
System productivity drops.
High-pressure mixing heads, by contrast, are self-cleaning in every cycle; after each shot they're immediately ready for the next shot.
System productivity and flexibility are increased.
* Applications - KraussMaffei's new high-pressure systems are already in operation in two mass-production applications processing small PUR volumes.
One application involves gluing metal profile strips to glass panes, another glues an EPDM seal to a second element.
Other important applications for high-pressure, microvolume systems are automatic application of sealing beads (formed-in-place foam gaskets, FIPFG) and casting electronics components.
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