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What is the difference between heat shoes and heat rollers on a roll laminator?

Heat shoes are an electrically-heated cylinder-shaped “shoe” with a heating element inside, which the film is pulled across and the rollers apply pressure.

Heated rollers utilize a heating element which is embedded in the center of two nip rollers; the film is heated as it comes around the nip roller.
The rollers apply both heat and pressure to the film.   Heated-rollers typically offer a slightly better bond than heat shoes.  Heat rollers will often increase the bond strength on digital prints.