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Epoxy resin infusion systems for wind blade manufacturing
Date: 2009-10-12    Hits: 478    Fontsize:14 12 10    

For specific and high technological niches, Cannon engineered dedicated mixing heads and dosing equipment able to pour not only polyurethane formulations but also other type of mixture with different physical properties such epoxy resins.

In the fast growing market of renewable energies, wind energy is one of the most important and significant sector. In this field, epoxy resins are used for the vacuum infusion of wind blades that are part of a wind turbine.

Cannon has recently engineered a new and dedicated range of units to meter and mix significant quantities of epoxy resins that have to be dosed at low output in a quite long infusion process.

The giant blades that catch the wind and propel the electric generators are built with a combination of technologies, mainly by impregnating light mats of glass fiber with bi-component resins, mainly liquid Polyesters and Epoxies.

These reacting formulations require metering and mixing devices to dispense tons of material into the enormous moulds where the blades are shaped.

The new Cannon Epoxy Infusion machines are compact, transportable, fullyelectric dosing units equipped with closed-loop control of output and ratio.

This guarantees a continuous control over the injection of these liquid resins in the vacuumised moulds that contain various layers of glass reinforcement.

The infusion process can proceed for 2-3 hours up to even more, and the flow of material varies according to the level of filling requested.

A medium-output beginning phase is followed by a progressively reduction of flow, due to the resistance and friction created in the mould - as well as the wetting of the mass of reinforcement.

The need of filling the most extreme portion of the long blades with the same proportion of resin over the reinforcement raises the problem of a continuous change of injection rate, thus the necessity of a closed-loop control of the output of both components.

Keeping a precise mixing ratio is a fundamental precaution to avoid emissions of non-reacted chemicals at the end of the process.

The most common models of Cannon machines for Epoxies are able to dose from 5 up to 80 kg/min of resins working in a range of mixing ratios, using a long static mixer attached to a dedicated mixing head.

The machines can also be directly fed by a standard IBC (Intermediate Bulk Containers) or connected to the central chemicals' storage.

All available models are equipped with a "Touch Screen" color panel to monitor and control the machine functions in real time.

Origin of the Article:Cannon   return     print  
   
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