Blocked shrink bundling film

A process for making a blocked shrink film, the process comprising the steps of

• extruding three or more extrudable materials through a die to form a molten tubular film, wherein at least a first extrudable material comprises low density polyethylene, high density polyethylene, metallocene polyethylene, linear low density polyethylene, or a combination thereof and is configured to form at least a first layer of the molten tubular film, wherein at least a second extrudable material comprises very low density polyethylene, ultra-low density polyethylene, ethylene-vinyl acetate, or a combination thereof and is configured to form at least a second layer of the molten tubular film, wherein at least a third extrudable material comprises linear low density polyethylene, high density polyethylene, low density polyethylene, calcium carbonate, or a combination thereof and is configured to form at least a third layer of the molten tubular film, and wherein the third layer is disposed between the first layer and the second layer,
• injecting the molten tubular film with air to form a film bubble, wherein an interior surface of the film bubble is provided by the second layer of the molten tubular film,
• drawing the film bubble away from the die, and
• collapsing the film bubble upon itself, such that a first interior surface of the film bubble adheres to an adjacent second interior surface of the film bubble via blocking, thereby forming the blocked shrink film.

A process for making a blocked, five-layered shrink film, the process comprising the steps of

• extruding three extrudable materials through a die to form a molten tubular film, wherein a first extrudable material comprises low density polyethylene, high density polyethylene, metallocene polyethylene, linear low density polyethylene, or a combination thereof and is configured to form a first layer and a fifth layer of the molten tubular film, wherein a second extrudable material comprises a very low density polyethylene or ethylene-vinyl acetate and is configured to form a second layer of the molten tubular film, wherein a third extrudable material comprises linear low density polyethylene, high density polyethylene, low density polyethylene, calcium carbonate, or a combination thereof and is configured to form a third layer and a fourth layer of the molten tubular film, wherein the third layer is disposed between the first layer and the second layer, and wherein the fourth layer is disposed between the second layer and the fifth layer,
• injecting air into an interior of the molten tubular film through the die to form a film bubble, wherein an interior surface of the film bubble is provided by the second layer of the molten tubular film,
• drawing the film bubble away from the die, thereby imparting orientation to the molten tubular film,
• cooling an exterior surface and/or the interior surface of the air bubble with blown air,
• collapsing the film bubble upon itself, such that a first interior surface of the film bubble adheres to an adjacent second interior surface of the film bubble via blocking, thereby forming the blocked, five-layered shrink film.