Side entry In Mold Labeling System In-mold labeling, or IML, is an innovative technology that opens new horizons in the labeling process used for all types of injection-molded, blow-molded, and thermoformed plastic containers or parts.The IML process allows you to fuse in-mold labels (high-quality graphic images) to plastic in a single step when molding your plastic containers or parts.Your brand image is permanently protected with durable plastic properties that resist the elements.