Method of manufacturing food packaging plastic films and food packaging plastic films thus produced

A method of manufacturing a detectable thermoplastic food packaging film, which thermoplastic film comprises detectable particles incorporated therein,

• wherein the method comprises the following steps:
• (i) a first step of introducing detectable particles into a molten plastic resin to produce a mixture comprising the molten plastic resin and the detectable particles,
• wherein the detectable particles are magnetic and comprise a surface-modification being at least one of protective against oxygen and protective against oxidation, and
• wherein the detectable particles are introduced into the molten plastic resin in the form of a particulate compounded mixture comprising the detectable particles together with and distributed in a carrier plastic resin, wherein the particulate compounded mixture comprises the detectable particles in amounts in the range of from 10 to 80 wt. %, based on the particulate compounded mixture;
• (ii) followed by a second step of extruding the mixture comprising the molten plastic resin and the detectable particles, so as to obtain a thermoplastic food packaging film comprising the detectable particles incorporated therein in homogeneous distribution.