Improved filtering screen and support frame therefor

B - Operations – Transporting – 07 – B

Patent

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Details

B07B 1/46 (2006.01) B01D 29/01 (2006.01) B01D 33/00 (2006.01) B07B 1/48 (2006.01) B29C 33/40 (2006.01) B29C 45/14 (2006.01) B29C 70/56 (2006.01) B29C 70/70 (2006.01) B29C 70/82 (2006.01) B29C 70/88 (2006.01)

Patent

CA 2281098

A method of constructing a frame for a filtering screen from a polymer material is described in which a wire frame reinforcement is wholly encapsulated during the frame moulding process so that two parallel spaced apart wires extend through each of the intersecting orthogonal ribs which define the open area of the frame across which the wirecloths are stretched. The surfaces of the frame in which the wirecloths are embedded are formed with ridges and the crests of the latter extend to different heights. The crests are softened by heating during the manufacturing process and the wirecloths stretched over the frame are forced into the softened crests after which the assembly is allowed to cool and cure. The frame is re-usable by stripping wirecloths from the top of the frame and fitting fresh wirecloths over the plastics material and heating the regions which are to encapsulate the fresh wirecloth.

L'invention concerne un procédé de construction d'un châssis (10) pour tamis de filtrage réalisé à partir d'une matière polymère. Selon ce procédé, un renforcement métallique est entièrement enveloppé au cours du processus de moulage du châssis de manière que deux fils métalliques parallèles séparés s'étendent le long de chacune des nervures (14, 16) perpendicuaires qui s'entrecroisent et définissent la zone ouverte du châssis (10) au-dessus duquel sont étendues les toiles métalliques (158, 159). Les surfaces du châssis (10), dans lequel les toiles métalliques (158, 159) sont incorporées, sont dotées de côtes (22, 30, 32) dont les arêtes présentent différentes hauteurs. Les crêtes sont ramollies par chauffage au cours du processus de fabrication et les toiles métalliques (158, 159) sont étirées sur le châssis (10) et introduites par la force dans les crêtes ramollies, après quoi, l'ensemble est refroidi et polymérisé. On peut réutiliser le châssis (10) en retirant les toiles métalliques (158, 159) de la face supérieure du châssis (10), en disposant de nouvelles toiles sur la matière plastique et en chauffant les régions destinées à envelopper la nouvelle toile métallique.

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