Envision Plastics Expert Announces Part Nine in the Series: How to Design Plastic Enclosures Using NMR Technology

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NMR Technology (No Molds Required) is a technology Envision Plastics and Design uses to manufacture custom plastic electronic enclosures with no tooling or molds. Since it’s a unique plastic fabrication process, some forethought goes into the design criteria to make an economical plastic enclosure.

The last entry created in this series focused on cosmetic issues such as radii and solvent welding to hold such radii on plastic enclosures or bezels. This entry will also involve cosmetics with respect to the final appearance and assembly of the enclosure.

Most, if not all, of the plastic enclosures Envision manufactures with NMR Technology use a tongue and groove method in some manner in which the intent is to snap fit or slide together enclosure components. This could apply to UU Enclosures, L-Slide Enclosures, and even some removable cover enclosures in which the cover slide on and off.

Sometimes, the tongue and groove is limited to the enclosure construction itself – used solely on the main wrapper and end caps of the plastic housing. In this instance, a cover would be mechanically fastened to the 5 –sided housing. This mechanical fastening can happen in a couple different ways. The most common way is to design in an internal perimeter “shelf” or frame that gets solvent welded on to the interior walls of the housing. This frame would have holes in it, securing brass inserts that would receive the screws for the cover.

At times, due to customer requirements, the plastic enclosure is designed as a UU Snap Together box but needs a little more “integrity” when it comes to drop tests or other forms of impact testing. When this is needed, we solvent weld a tab with a brass insert to one of the “U” pieces and the other “U” component has a hole for a screw to secure both of the U’s together.

It is often required that an enclosure be constructed to be water resistant or water proof. Our next article in this series will describe how we can make this type of plastic enclosure.

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Brian DuFresne
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