Capsule with flow control and filtering member
View Patent ↗A sealed capsule contains a beverage ingredient in powder form, in particular, ground coffee. The capsule comprises a base body ( 4 ) and a foil member ( 5 ) tightly attached to the base body ( 4 ), the foil member ( 5 ) being made from a material allowing the production of a multitude of perforations in the foil member ( 5 ) when the foil member ( 5 ) is thrust, via the pressure caused by injecting a liquid or a liquid/gas mix into the capsule, against a relief plate of a beverage production machine, wherein the capsule is provided with a flow control porous member ( 80 ), the flow control porous member ( 80 ) being positioned between at least a portion of ingredients ( 3 ) and the foil member ( 5 ). The flow control porous member provides a faster and more consistent flow of the liquid extract through the capsule and significantly reduces the resurgence of non-soluble solids.
1. A capsule for use in a beverage production machine, the beverage production machine comprising a member that perforates an inlet side of a body of the capsule opposed to a foil member and a flange-like rim and injects a liquid or a liquid/gas mix into the capsule; and a relief plate having a multitude of relief elements, the relief plate is positioned in the machine such that injection pressure urges the foil member against the relief plate; and the capsule comprising:
a base body sealed off by the foil member tightly attached to the flange-like rim of the base body, the foil member (i) having a thickness between 15 and 45 microns, (ii) being constructed from a material selected from the group consisting of aluminum, aluminum alloy, a laminate of aluminum and a polymer, a laminate of aluminum alloy and a polymer, and combinations thereof, and (iii) when perforated by the relief plate, forms a multitude of openings when the pressure of the injected liquid or liquid/gas mixture reaches a value of at least 4 bar, wherein the base body contains ground coffee having a particle size between 190 and 400 microns; and
a flow control porous member positioned between at least a portion of ingredients in the capsule and the foil member, the flow control porous member having a pore size of between 0.4 and 2 microns,
wherein the porous member is made of at least one thin polymeric membrane having a thickness between 0.4 microns and 1.0 mm, and is made of a material selected from the group consisting of polypropylene, polyethylene, PBT, Nylon, polycarbonate, poly(4-methyl pentene-), polyurethane, PET, polyethersulfone, polyamide, resin bonded-glass fibers and combinations thereof.
2. The capsule of claim 1 , wherein a thickness ratio of the flow control porous member to the foil member is between 5:1 and 20:1.
3. The capsule of claim 1 , wherein the flow control porous member is thicker than the foil member.
4. The capsule of claim 1 , wherein the flow control porous member comprises essentially polymeric fiber-containing material and is made from a woven and/or non-woven material.
5. The capsule of claim 1 , wherein the flow control porous member is adjacent to the foil member.
6. The capsule of claim 5 , wherein the foil member and the flow control porous member form a multilayer laminate.
7. The capsule of claim 1 , wherein the flow control porous member has a shape selected from the group consisting of square and rectangular.
8. The capsule of claim 1 , wherein the flow control porous member comprises microfibres of a diameter less than 20 microns.
9. The capsule of claim 1 , wherein the base body is made from a material selected from the group consisting of aluminum, aluminum alloy, a laminate of aluminum and a polymer, a laminate of aluminum alloy and a polymer, and combinations thereof.