Product category:
Moulding materials
News Release from: Dow Corning | Subject: "in situ"-mixing extrusion system
Edited by the Manufacturingtalk Editorial
Team on 17 December 2001
In-situ-mixing extrusion fine-tunes
compounds
Dow Corning's system helps to fine tune compounds with fillers, processing aids, colorants in one step on one extrusion machine, to reduce costs and delivery times.
In-situ-mixing extrusion increases productivity Dow Corning's system helps to fine tune compounds with fillers, processing aids, colorants in one step on one extrusion machine, to reduce costs and delivery times In partnership with Colmec, Italy, Dow Corning has developed a patented "in situ"-mixing extrusion system that allows users to mix then extrude uncolored, Silastic brand high consistency silicone rubber compounds with color masterbatches, or various additives, fillers, and processing aids in a single step on one piece of equipment
This article was originally published on Manufacturingtalk on 17 Jun 2002 at 8.00am (UK)
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Versus conventional practices, the system allows fabricators to increase processing flexibility by reducing raw material inventories since precolored masterbatches no longer need to be purchased, as color can be added on-the-fly.
The system also can shorten production times and lower costs by up to 15% annually, while at the same time yielding excellent mixing and a very consistent product.
These benefits make it easier to compress delivery times to customers and react faster to changing market demands.
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The "in situ"-mixing extrusion system can be used either with conventional peroxide-cure silicone chemistry, or with increasingly popular platinum-catalyzed systems.
Benefits of switching to addition-cure platinum catalysts include: * Elimination of 2,4 DCIBP cure by-products for environmental and health benefits.
* Elimination of post-cure treatment for non-food applications, since cure is more complete with this chemistry.
* Easy, on-the-fly changes of cure speed to meet varying processing requirements.
* No compromise to stability and shelf life for the silicone compounds.
The new extrusion technology will be of interest to fabricators using high-consistency silicone rubber products for the wire and cable, building and construction, and automotive industries, as well as for extruding tubing and hose.
Two machine options are available for users wishing to implement the "in situ"-mixing extrusion technology.
In Option 1, for customers already using a Colmec extruder, purchase of a second, 45mm Colmec extruder with a 2:1 L/D ratio, an additional screw, and an adapter with mix zone and extruder head would complete the system.
In Option 2, for customers who do not already use Colmec equipment, purchase of two Colmec extruders - e g, one 45mm and one 90mm - plus the adapter with mix zone and extruder head would complete the system.
Furthermore, it is possible to modify existing Colmec extruders to function like this new system.
Dow Corning holds a global patent on the machine concepts and the process.
Colmec produces, sells, jointly markets, and services the equipment.
For more information about the "in situ"-mixing extruder, call our Dow Corning expertise center in Spain, at +0034-93-363.69.10.
Colmec has been a leading manufacturer of rubber extrusion lines for the European marketplace for the past 30 years.
Headquartered in Milan, Italy, the company can be contacted at www.colmec.it, or by writing to: 20020 Vanzaghello, Milano, Italy, phone: +39.0331.306.600, fax: +39.0331.306.280, and e-mail: colmec@colmec.it.
Dow Corning, which develops, manufactures, and markets diverse silicon-based products, currently offers more than 7,000 products and services to customers around the world.
Dow Corning is a global leader in silicon-based materials with shares equally owned by the Dow Chemical Company and Corning Incorporated.
More than half of Dow Corning's sales are outside the United States.
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