03/20/04 Created By: Jared Beland

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Weatherproofing

Vermont Technical College

2003 Senior Projects I

Technical Topic Presentation

03/20/04 Created By: Jared Beland

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Uses for Weatherproofing

A way to keep liquids or particles from entering or exiting through joints of any structure/machine.

Helps reinforce structures.

Makes structure more aesthetically pleasing depending on applications.

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03/20/04 Created By: Jared Beland

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Types of Weatherproofing

GasketsAdhesivesOvermoldingUltrasonic Welding

03/20/04 Created By: Jared Beland

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Gasket DescriptionMainly used for engine applications.

Very cost effective.

Used to prevent fluid or gas leaks by providing a barrier between two mating surfaces.

Common materials: Rubber, Graphite, Teflon, Copper, and Silicone.

Can withstand high temperatures and pressure.

03/20/04 Created By: Jared Beland

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Gaskets

03/20/04 Created By: Jared Beland

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Adhesive DescriptionWorks like a gasket but starts in a liquid form.

Cheap and easy to use.

Protective coating that seals porous surfaces, fine cracks and voids.

Self curing and hardens to a ceramic like, non porous, impermeable film.

Can withstand tons of hydrostatic pressure.

03/20/04 Created By: Jared Beland

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Adhesives

                               

03/20/04 Created By: Jared Beland

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Overmolding DescriptionA process whereby two different plastic materials are molded together to produce a unique part. Allows designers to create a strong structural product with a weather protective cover.

More often used if large quantities are being produced. (costly)

Seamlessly integrated and joined.

03/20/04 Created By: Jared Beland

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Overmolding

                            

                                            

                     

                                          

03/20/04 Created By: Jared Beland

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Ultrasonic Welding Description

The process of generating melt at the mating surfaces of two thermoplastic parts through use of high frequency sound energy.Frequencies of 20, 30 or 40kHz. Weld times are typically less than 1 second. Best suited for mass production.Resultant joint strength approaches that of the parent material.

03/20/04 Created By: Jared Beland

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Ultrasonic Welding

03/20/04 Created By: Jared Beland

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Pros and Cons Matrix

Seal CostEasy to Apply

Wear Rate

Aesthetically Pleasing

Total

Gaskets 4 5 5 3 4 21

Adhesives 3 4 4 3 3 17

Overmolding 5 2 2 5 5 19

Ultrasonic Welding

5 2 2 5 5 19