Modelling paste provides rugged models
A
Huntsman Advanced Materials product story
Edited by the Engineeringtalk editorial team
Feb 1, 2008
RenPaste 4666 offers good temperature resistance, is durable enough for repeated demoulding and gives a high-quality finish
RenPaste 4666 has been used by El-Bo Produktion for the scale model of a new 12m sailing boat.
El-Bo Produktion worked from CAD data and used its computer-controlled CNC cutting facility to produce a 1:12 scale model of the boat's substructure from a block of lightweight expanded polyurethane foam.
RenPaste 4666 modelling paste was then applied by machine using computer-controlled extrusion technology in a 20mm layer over the foam substructure.
Once cured at room temperature, the paste model was then milled back to 8mm using a five-axis CNC milling machine to give a final smooth surface finish.
The model was then field tested, prior to full customer approval.
"We use RenPaste materials for a range of applications from small scale models like this to full size parts for automotive, marine and wing energy applications", said Bo Vinter Poulson, Managing Director at El-Bo Produktion.
"Each paste is able to provide just the right set of characteristics to meet our requirements".
"The new RenPaste 4666 proved suitable for this marine concept model as it offers good temperature resistance, is durable enough for repeated demoulding and gives a high-quality finish, so the model can be used for customer approval".
"RenPaste materials generally are also easy to handle and machine and help keep milling waste to a minimum".
RenPaste 4666 has been designed for use with the most modern automated rapid manufacturing systems, such as those used at El-Bo Produktion, as well as hand modelling.
This has been achieved through a chemical thixotrophy developed by Huntsman that enables the user to alter the SMP rheology by simply changing the mixing parameters.
This programmable paste rheology (PPR) changes the SMP's characteristics from a fluid that can be applied to a depth of 10mm to a viscous material capable of up to 40mm thick application.
The user can select the paste rheology required for individual jobs, from high-speed automated application to thick hand application.
For easy, rapid assessment of the mix quality, there are different component and mixed paste colours.
The high-quality results reduce the need for additional repairs or re-working of the model and the fine surface quality reduces any further finishing time.
RenPaste 4666 also exhibits excellent dimensional stability and low shrinkage on precision models.
In addition to its variable viscosity, RenPaste 4666 offers excellent adhesion to polystyrene, often used as a lightweight and cost-effective substrate for SMP models.
It cures rapidly at room temperatures and is heat resistant up to 80C after a suitable post cure.
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