- For larger scale brewing, drawdown should occupy 25-30% of the total contact time.
- For single cup brewing, the necessity of keeping the slurry temperature sufficiently hot to promote good extraction yields needs to take precedence over the drawdown time profiling.
- Spray heads with insufficient streams promote wells in the coffee bed.
- 01 sized flat-bed brewers promote even extraction but can trap grinds in the fluted edges.
- Filter papers are fabricated with wet strength agents that create ionic bonds between the cellulose to make them stronger.
- Wet lay machines are used in the fabrication process to facilitate extra wet strength.
- Creping of the paper surface promotes faster flow and helps counteract the muddying effect which can reduce flow rates.
Creping A method of increasing the pour availability of filter papers by bunching up the paper into a creped texture.
First crack The sudden expansion of the coffee cell walls brought on by a build-up of steam pressure inside a coffee bean.
Fluted edges The wave-shaped creases pressed into a filter paper, intended to increase the strength of the walls.
Muddying The caking of fine particles onto the surface of a filter paper, which has the effect of reducing the flow rate of liquid through the filter.
Wet lay machine A machine used in the fabrication of coffee filter papers