Manufacturing Technologies for Turbine Power Blades - Hybrid Anisotropic Materials for Wind Power Turbine Blades - page 94

Fiber with polymer resin

Area without polymer resin

Rod section of the large rotorblade

FIGURE 4.3
Setup. for. resin. infusion. test. of. a. root. end. section. of. a. large. rotoblade. at. L.. M.. Glasiber,.
Lunderskov,.Denmark.

Generally,.it.is.normal.to.use.a.vacuum.infusion.technique.where.all.the.
dry.ibers.are.covered.with.a.polymer.ilm.sealed.to.the.edge.of.a.mold.and.
held.in.place.against.the.mold.by.a.vacuum.pulled.underneath.the.polymer.
ilm.(Figure 4.3).
If.the.resin.line.is.opened,.we.could.pull.resin.into.the.dry.package.with.
the.vacuum..When.all.the.ibers.are.wetted,.the.resin.line.is.closed,.and.the.
vacuum.sucks.out.surplus.resin.into.a.resin.trap..The.atmospheric.pressure.
outside.the.polymer.ilm.consolidates.the.laminate.toward.the.mold.surface,.
and.the.resin.is.allowed.to.cure..The.two.airfoils.and.the.webs.are.manufac-
tured.separately,.and.all.parts.are.adhesively.bonded.to.complete.the.blade.
in.a.subsequent.process.
Siemens.Wind.Power.in.Demark.has.developed.a.special.iber.placement.
and.resin.infusion.technology.for.the.company's.40-m-long.blade,.where.the.
ibers.for.the.entire.blade,.including.airfoil,.spars,.and.webs.are.placed.inside.
a.mold.cavity.and.the.resin.is.infused.to.complete.the.blade.in.one.pass. 11
The. advantages. of. resin. infusion. technologies,. compared. with. those. of.
hand.lay-up,.are.the.same.as.mentioned.for.the.prepreg.technology,.except.
for.easier.process.control..The.challenge.is.to.control.the.resin.low.to.avoid.
spots.with.dry.ibers.in.the.inished.product.

4.6 Out-of-AutoclaveCompositePrepregProcess

4.6.1 Introduction

Lightweight.composite.materials.have.been.widely.used.in.the.production.of.
wind.turbine.blade.structures..The.airframes.of.aircraft,.such.as.the.F22,.F35,.
and.F18,.could.be.designed.from.reinforced.composites..The.F35.and.others.