An apparatus for delivering product carriers, in particular L boards, to a conveying line for food products comprises a store for the product carriers and a conveying device for conveying the product carriers, in particular isolated product carriers, along a conveying direction to the conveying line, wherein each product carrier has at least one base section and at least one cover section connected to the base section; and wherein the apparatus comprises a pre-treatment device for the product carriers that is configured to pre-treat the cover section of a product carrier with respect to its base section.