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.
The
warpage 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 problem.
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.