What's more, the new flat glass products are said to help thwart warpage
(differential shrinkage and residual stress relaxation) of a plastic or composite part after demolding.
However, when observing from the side face, the slight warpage
could still be observed (Fig.
Caption: Figure 5--comparison between the warpage
prediction and the experimental result
problem is compounded with high-shrink, semicrystalline materials.
KEYWORDS: Injection moulding warpage
analysis moldflow software taguchi method experimental validation 1.
The standard is both educational about the general topic of PCB warpage
measurement and specific in its guidelines for how such measurement should be done.
Choi and Im  employed the numerical analysis of shrinkage and warpage
of injection-molded parts made of amorphous polymers.
Ticona says that in-house testing and customer trials have shown less warpage
of intricately designed connectors out of the mould and after reflow soldering, compared to parts moulded with other commercially available LCP grades and high temperature nylons.
These molded parts are designed to eliminate expansion/contraction, warpage
, and cracking over a wide range of temperatures.
There is also described the flow and warpage
analysis of the injection process of the new composite.
The new resin also produces parts with lower warpage
for better part alignment and increased soldering yields.
bottom boards--Bottom boards minimize warpage
as the binder finishes curing.