Filtration of flux contaminants

Details Filtration of flux contaminants Filtration of flux contaminants

B - Operations, Transporting

23

K

B23K 3/08 (2006.01) B23K 1/008 (2006.01) H05K 13/04 (2006.01)

Patent

CA 2476123

A two-stage filtration system is coupled with an oven, such as a solder reflow oven, to remove a vapor stream from the oven and to remove organic compounds that have volatilized from a solder flux and other contaminants from the vapor stream. The filtration system includes a first stage for trapping larger particles and a second stage including a packed bed of wettable media, such as steel balls, for trapping smaller particles and serving as a nucleation site for condensed organic compounds. The first stage can be a centrifugal self- cleaning element in the form of a mesh strainer coupled with a rotary motor for spinning the mesh strainer.

L'invention concerne un système de filtration à deux étages couplé à un four tel qu'un four de refusion, afin d'extraire un courant de vapeur du four et d'extraire les composés organiques qui se sont volatilisés à partir d'un flux de soudage, ainsi que d'autres contaminants de ce courant de vapeur. Ce système de filtration contient un premier étage servant à piéger les grandes particules et un second étage comprenant une colonne à garnissage qui contient une matière mouillable tel que des billes d'acier, permettant de piéger les petites particules et servant de site de nucléation pour les composés organiques condensés. Le premier étage peut être un élément autonettoyant centrifuge sous forme de tamis à mailles, couplé à un moteur rotatif permettant d'entraîner le tamis à mailles en rotation.

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