Product category:
Handling and automation equipment
News Release from: Krauss-Maffei (UK) | Subject: Twin piston metering system for plastics material
Edited by the Manufacturingtalk Editorial
Team on 16 February 2007
Twin piston system meters filled
plastics
A twin piston metering system for plastics material bearing abrasive fillers feeds at highly uniform rate to the mixing head, maintaining a constant polyol/isocyanate mixing ratio.
Fillers, flame inhibitors and reinforcing fibres give polyurethane materials the properties required to meet product specifications At the same time, abrasive additives cause a wear problem for the metering systems
This article was originally published on Manufacturingtalk on 11 Jun 2001 at 8.00am (UK)
Related stories
Large moulds changed in 15 min
A quick mould change system from Krauss-Maffei is helping automotive components moulder R-TEK to keep ahead of the demanding requirements of its major OEM customers.
Moulds changed automatically in under 15 min
A quick mould change system from Krauss-Maffei is helping automotive components supplier, R-TEK, to keep ahead of the demanding requirements of its customers.
It is not feasible to deliver the PUR component/abrasive material mix to the mixing head via a conventional pump metering system, because of the enormous wear on pump components.
Piston metering systems are less subject to wear, but single-piston metering systems have a serious disadvantage in that the material flow is not constant.
On the other hand, constant flow is often essential, e g, for high productivity, in applications requiring protracted shot times, or to supply several mixing heads.
Further reading
Delicate materials integrated in moulds
Krauss-Maffei's low pressure back injection compression process offers benefits in costs and design for automotive interior moulding.
All-electric injection moulders to be shown
Krauss-Maffei is choosing K01 in Dusseldorf this October to launch its first-ever range of electric injection moulding machines.
Krauss-Maffei's Tandem Hybrid PUR metering machine provides a good way out of this dilemma.
In this new system, the abrasive component is fed by two pistons operating in tandem.
The pistons move anticyclically, ie, while one is discharging the other is filling.
A sophisticated control system ensures that material flow remains constant even during piston switchover.
The pistons are actuated by servomotor spindle drives.
Electric drives have several advantages compared with hydraulic drives.
System start-up is very much simpler.
The spindle drive supports high-precision piston movements.
As a result, the filled component is fed at highly uniform rate to the mixing head, maintaining a constant polyol/isocyanate mixing ratio.
The end result is consistently high product quality.
Krauss-Maffei's Tandem Hybrid PUR metering machine is the right solution for many different application areas - from processing glassfibre (RRIM) and abrasive flame inhibitors to fillers and reinforcing materials, such as wollastonite, barite or chalk.
* About Krauss-Maffei company - worldwide Krauss-Maffei is a premium partner for plastics processing industries.
Krauss-Maffei machines and systems are used wherever plastics are converted into products.
Our know-how covers every aspect - from the product idea to the customer-specific system solution.
Krauss-Maffei is the only company in the market with expertise in the three major machine technologies for plastics processing: injection moulding technology, extrusion technology and reaction process machinery.
We integrate the three technologies to generate synergies in processes and machinery for plastics.
As an international company, Krauss-Maffei has a presence in all important global markets and in the major plastics processing industries.
Our sales and service network currently comprises 23 subsidiaries and 40 agencies.
Krauss-Maffei employs around 2,450 people worldwide.
In the 2004/2005 business year (closing date September 30, 2005) consolidated sales for the Krauss-Maffei Group totalled EUR 551.1 million.
• Krauss-Maffei (UK): contact details and other news
• Email this article to a colleague
• Register for the free Manufacturingtalk email newsletter
• Manufacturingtalk Home Page
Search the Pro-Talk network of sites
