Which seaming tool does not make contact with thermoplastic adhesive on carpet seaming tape?

The vacuum cooling tool is the correct choice because it operates by facilitating the cooling of the seam area without engaging directly with the thermoplastic adhesive. This tool is designed to help manage the temperature of the seam, leading to more effective adhesion and preventing overheating or damage to the carpet fibers. By not coming into contact with the adhesive itself, it allows for cooling to occur without disrupting the integrity of the adhesive bond.

In contrast, other tools, such as the iron, the radio frequency seaming unit, and the seam roller, directly interact with the thermoplastic adhesive. The iron applies heat to activate the adhesive, while the radio frequency seaming unit uses electromagnetic waves to bond the seam. The seam roller, on the other hand, helps to press the carpet pieces together after the adhesive has been applied, ensuring a tight and even bond but does so in contact with the adhesive.