Patent ID: 8231918

Claim:
A method for delivering a coffee extract of 25 to 40 grams from a capsule containing ground coffee within a flow time of 20 seconds or less by injection of water under pressure within the capsule, which comprises: providing a ground coffee containing capsule for extraction in a coffee extraction device where water is injected into the capsule under pressure to deliver the coffee extract, the capsule having a delivery membrane and filled with a bed of ground coffee; wherein the delivery membrane initially retains the ground coffee therein until the coffee beverage is released through the delivery membrane of the capsule with engaging means engaging in or against the membrane to provide an exit for the coffee beverage; and reducing pressure loss at the interface of the membrane and engaging means by providing a membrane having a puncture resistance of between 1.1 and 3.5 mJ, and by providing in the capsule ground coffee having an average particle size of less than 300 microns, and a controlled percentage of fines (F) depending on the average particle size (D4,3) within the following limits: F is between 14 and 18% when D4,3 is between 250 and 299 microns, F is between 17 and 21% when D4,3 is measured between 200 and 249 microns, and F is between 22 and 28% when D4,3 is measured between 150 and 199 microns.