Segen, vacuum tends to be effective with porous mold plates up to 4 in.
Processors also benefit from the unusual self-cooling effect of porous molds. The vacuum pulls air in through the sides of the mold to carry away heat from the plastic.
Cost reductions and improvements in productivity and product quality are benefits that can be achieved through use of the porous mold
The commercially available PC particle (AD-5503) was purchased from Teijin Kasei America, USA), dewatered by putting into a vacuum oven at 60[degrees]C for more than 72 h before use AAO (anodized alumina oxide membranes) membranes (Whatman, UK) were used as ordered porous mold
containing nanochannels, without any surface modification.
The explicit filling methodology described earlier and used in finite-element-control volume techniques for the resin filling inside a porous mold cavity involves only the continuity equation given by [Nabla][center dot] u = 0, based on an incompressible resin and the velocity field approximated using Darcy's approximation.
As discussed earlier, the objective of the polymer resin transfer mold-filling analysis is the conservation of the resin mass at any instant of time flowing through a porous mold cavity.
Overview: StarCast is based on the computational continuum mechanics approach and simulates liquid, solid and gaseous phases of casting, including conjugate heat transfer, a sharp resolution of the filling front, free-surface fragmentation, motion of trapped gas bubbles in melt, forced and natural convection in the melt and gas flow through porous molds
In an article (9) it has been shown that the low processing temperature has a beneficial effect on the structure of the porous molded parts.
In this work (1), mechanical indices of solid and porous molded parts from polypropylene with 0.5 to 2% addition or Hydrocerol CF40 blowing agent, obtained at different injection pressure and mold temperature were evaluated.