Roll-to-roll substrates transferring unit and method of processing substrates using the substrates transferring unit

A substrates transferring unit configured for transferring in-process flexible substrates during roll-to-roll processing of a sheet having such substrates defined as monolithically integrated portions of the sheet, the substrates transferring unit comprising:

• a plurality of first transferring rolls disposed for making contact with a first surface of a pre-specified, supplied and to-be-advanced substrates-conveying sheet having flexible and in-process substrates provided thereon or therein as monolithically integrated portions of the sheet, each of the first transferring rolls including a respective first central portion that can be charged with electric charge of a first polarity and including a respective electrically insulative first outer portion surrounding the first central portion;
• wherein the first surface of the supplied substrates-conveying sheet is spaced apart from respective to-be-processed working surfaces of its monolithically integrated substrates;
• wherein the first surface of the pre-specified, supplied substrates-conveying sheet is electrically insulative and capable of retaining electrostatically-induced charge thereon;
• and
• wherein the substrates transferring unit is configured to not directly engage with the to-be-processed working surfaces of the pre-specified, supplied substrates-conveying sheet;
• a plurality of second transferring rolls disposed for making contact with the first surface of the to-be-advanced substrates-conveying sheet and disposed spaced apart from the first transferring rolls, each of the second transferring rolls including a respective second central portion that can be charged with electric charge of a second polarity opposite to the first polarity and a respective electrically insulative second outer portion surrounding the second central portion, wherein two of the first transferring rolls and two of the second transferring rolls are alternately disposed with each other.