Foil seal liners - Induction Heat Foil Seal liners -
There are 2 major types of induction seal liners. If the aluminum layer comes with a paper or foam backing it is a 2 piece foil seal liner. The side with paper (pulpboard) or foam backing layer will insert into the container closure. Foil seal liners without a backing layer would be 1 piece type. 1 pc and 2 pc liners have different typicality