US 12,186,691 B2
Bag for pressure leaf filter
Marilene Amaral Leite Manoel, Contagem (BR); Rafael de Felipe Zica, Belo Horizonte (BR); Siterzany Fonseca, Belo Horizonte (BR); Wallace Farias Bacelar, Congonhas (BR); and Thiago Pavan, Belo Horizonte (BR)
Assigned to Valmet Technologies Oy, Espoo (FI)
Filed by Valmet Technologies Oy, Espoo (FI)
Filed on May 18, 2021, as Appl. No. 17/323,071.
Claims priority of application No. 20205502 (FI), filed on May 19, 2020.
Prior Publication US 2021/0362084 A1, Nov. 25, 2021
Int. Cl. B01D 46/00 (2022.01); B01D 46/02 (2006.01)
CPC B01D 46/0004 (2013.01) [B01D 46/001 (2013.01); B01D 46/023 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A leaf filter bag for a leaf of a pressure leaf filter, the leaf filter bag comprising:
a first sheet portion;
a second sheet portion adjacent to the first sheet portion, and connected to the first sheet portion along a first edge, a second edge and a third edge to define an enclosure for a leaf, wherein an openable and closable edge is defined by the first sheet portion and the second sheet portion between the first edge and the second edge which defines an opening for the reception into the enclosure of a frame of the leaf in an open position;
a closure comprising a zipper and a hook-and-loop fastener, wherein the zipper is positioned at the openable and closable edge for closing the openable and closable edge after the frame of the leaf is received within the enclosure defining a closed position of the leaf filter bag, wherein the zipper is placed along the length of the openable and closable edge of the leaf filter bag, and wherein the hook-and-loop fastener is fixed to the filter bag along the length of the openable and closable edge; and
a pipe flap which extends outwardly from the first sheet portion and the second sheet portion, and wherein the zipper has two parts, one secured to each of the first sheet portion and the second sheet portion beneath an outlet pipe of a leaf enclosed within the leaf filter bag and which extend upwardly and outwardly onto the pipe flap, such that when the zipper is zipped closed the pipe flap is formed into an encircling tube which can extend around the outlet pipe.