Coform filter media having increased particle loading capacity

Details Coform filter media having increased particle loading capacity Coform filter media having increased particle loading capacity

B - Operations, Transporting

01

D

B01D 39/18 (2006.01) B01D 39/16 (2006.01)

Patent

CA 2482407

Disclosed is a filter medium having at least a first layer containing a stabilized matrix of thermoplastic filaments and at least one secondary material; and a second layer having a stabilized matrix of thermoplastic filaments and optionally of at least one secondary material. Each of the layer of the filter medium has a different compositional ratio of the components to result in a gradient structure. The compositional gradient for the layers of the coform results in a filter having improved capacity, which extends the life of the filter medium, as compared to a filter without the compositional gradient. The present invention also provides a method of removing particles from a fluid containing particles. The method of the present invention includes contacting the fluid containing particles with the filter medium of having the two layers described above in a manner such that the fluid containing particles is passed through the first layer of the filter medium before the second layer.

Cette invention a trait à un milieu filtrant comportant au moins une première couche, contenant une matrice stabilisée de filaments thermoplastiques et au moins un second matériau, et une seconde couche contenant une matrice stabilisée de filaments thermoplastiques et, éventuellement, au moins un second matériau. Chaque couche du milieu filtrant a un rapport de composition des composants tel qu'il donne lieu à une structure à gradient. Le gradient de composition des couches du type coform permet d'obtenir un filtre aux capacités améliorées, ce qui prolonge la durée de vie du milieu filtrant par rapport à un filtre dépourvu de gradient de composition. Cette invention porte également sur un procédé d'extraction de particules d'un fluide. Le procédé consiste à mettre en contact le fluide contenant des particules avec le milieu filtrant à deux couches susmentionné, de façon que ledit fluide traverse d'abord la première couche avant de traverser la seconde.

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