Bow and twist is somewhat inevitable in the fast-moving consumer products market, and the ability to adjust for warpage
on-the-fly, while also accommodating larger products, is central to a dynamic, successful and profitable operation.
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
In the present research the largest deformations caused by warpage
in PCBs were found by using the following approaches: due to complexity of geometry warpage
the strain in PCBs was experimentally measured by flattening the warped PCBs with an assumption that flattened board sustains the same strain as produced by this warpage
but with opposite sign; the highest strain appears in the place with largest curvature.
problem is compounded with high-shrink, semicrystalline materials.
KEYWORDS: Injection moulding warpage
analysis moldflow software taguchi method experimental validation 1.0 INTRODUCTION
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.
"ForTii drastically improves warpage
yield loss and is outperforming any other polyamide as well as PPS and LCP.
The company Moldflow, according to their website, "develops products to optimize, automate and control every phase of the injection molding design-to-manufacturing process." This text combines three of their design guide documents for practicing engineers: Moldflow Design Principles, Warpage
Design Principles, and the C-MOLD Design Guide.
Its shrinkage at the time of setting is substantially lower than that of Karenz AOI, causing no substrate warpage
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.