Plastic wrap with cling layer

This invention describes a method for making a three-layer plastic wrap designed for food storage. The method involves co-extruding specific polyolefins: polypropylene for the release layer, which uses an anti-blocking agent for easy dispensing, and HDPE, LDPE, or LLDPE for the core layer. A separate cling layer is formed from a base resin and tackifier to provide adhesion to various surfaces.

Why it matters: Since 2003, advancements in polymer science have yielded new polyolefin grades with enhanced properties like improved strength or clarity, potentially optimizing the wrap's performance. Additionally, co-extrusion and lamination technologies have become more precise, enabling thinner, stronger, or more cost-effective multi-layer films.

Status: ExpiredProtection ended and was never renewed
How hard to build: SpecializedIndustrial extruders, lamination, material science

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