In a new process, a metal insert is partially premolded and then overmolded using conventional technology with traditional plastics used for housings. In the premolding ptocess, conductive paths are affixed in place, and are also tightly sealed in one step. Application targets are sophisticated automotive mechatronic parts such as transmission and brake controls, sensors and plug-in connectors. A key new material is a nonreinforced copolyamide that overmolds the electrical conductive paths in electronic components, ensuring there is no contact with moisture or oil. According to a technical expert at BASF, the material’s developer, the polymer adheres very well to either metals or plastics. To compensate, other sealing methods, such a silicon adhesives or hot melts, were used. Some engineers even precoated metals to improve adhesion
At IMTS last week, Stratasys introduced two new multi-materials PolyJet 3D printers, plus a new UV-resistant material for its FDM production 3D printers. They can be used in making jigs and fixtures, as well as prototypes and small runs of production parts.
Plastic bags can become useful as either raw materials for plastics or feedstock for fuel. It's when they're not recycled that they become a major problem. That's what California's bag ban will prevent.
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