Thermofoil

Thermofoil is a heat-formed vinyl/PVC finish vacuum-pressed over engineered wood, typically MDF; in cabinet and millwork it is often called rigid thermofoil (RTF) on door and drawer fronts. The process yields a seamless, easy-clean surface in solid colors, gloss, matte, or faux-wood appearances, mimicking painted or framed cabinetry without separate edge banding.

On a CNC millwork line, MDF parts are routed to final profile with careful attention to edge geometry and corner radii. The substrate is cleaned, adhesive is applied, and a heated PVC/vinyl sheet is vacuum-pressed so the film drapes into routed details. To avoid bridging and spring-back, the panel stays under restraint during cool-down, with heat and vacuum settings matched to the film's stretch characteristics. The payoff is a wrapped, seamless face that eliminates edge banding, making thermofoil popular for cabinet doors, drawer fronts, and end panels. But the finish inherits every substrate flaw: rough machining, sharp edges, or uneven adhesive will show up as weak bonds. Because thermofoil is a thin polymer skin, process control around routing, adhesive coverage, heat, vacuum, and cooling determines whether a door survives years of kitchen service or blisters, peels, and whitens at the corners.

• ⚠️Routed edges too sharp: A tight corner radius makes the film stretch thin, causing whitening, edge lift, or cracking. The film bridges the corner instead of conforming, leaving a weak bond that opens after thermal cycling or door slams.
• ⚠️Substrate moisture or heat exposure: Steam, direct heat, or poor humidity control breaks the adhesive bond, so the vinyl peels, blisters, or delaminates. Cabinet fronts near dishwashers, ovens, or under-sink leaks show edge separation first.
• ⚠️Trapped dust or glue voids: A dust nib, adhesive starvation, or vacuum leak creates a non-bond area that appears as bubbles or soft spots. The panel passes initial inspection, but thermal cycling turns the void into a peel initiation point.