TDLC sensor - The patented TDLC sensor is the latest innovation for TapTone’s Compression machines and was designed specifically for containers with a f lexible plastic or foil seal. The squeezing action of the compression system increases the head space pressure in the container, causing the foil or plastic seal to dome upward. This doming allows for a force measurement directly from the seal using the TDLC assembly. This technology allows for even more accurate and reliable leak inspection of a variety of cups and containers with these flexible seals.