Linear substrate infusion compartment

A linear substrate infusion system for infusing one or more components of an infusion liquid into a linear substrate, the linear substrate infusion system comprising:

• a processing barrel including an outer processing vessel and an inner processing vessel, the outer processing vessel having an outer wall having opposing ends, the inner processing vessel and the outer processing vessel forming a nested arrangement along a longitudinal length of the processing barrel with at least a portion of an infusion chamber defined therebetween, the processing barrel also having a linear substrate inlet having an inlet seal and defining an inlet opening into the infusion chamber and also a linear substrate outlet with an outlet seal and defining an outlet out of the infusion chamber,
• an exposure gap defined between the linear substrate inlet and the linear substrate outlet,
• the processing barrel further including portions defining an infusion liquid inlet and an infusion liquid outlet in liquid communication with the infusion chamber,
• at least one of the inlet and outlet seals being moveably coupled to the outer wall and being moveable with respect to each other between a plurality of relative positions, each of the relative positions defining a different length of the exposure gap,
• in a first relative position, the one of the inlet and outlet seals being in a first position located between the opposing ends of the outer wall, and in a second relative position, the one of the inlet and outlet being in a second position that is different from the first position,
• in the first relative position, the exposure gap having a first length that is greater than zero and the exposure gap being in liquid communication with the infusion chamber, and in the second relative position, the exposure gap having a second length that is less than the first length;
• and
• a first liquid loop fluidically connecting the infusion liquid inlet and the infusion liquid outlet.