Patent ID: 11873149
Assignee: SOFRESH, INC.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 3:
4. A method for manufacturing the film of claim 1, comprising:
combining a molten transmission polymer, a molten barrier polymer, and a molten sealant polymer in a feedblock;
co-extruding the molten transmission polymer, the molten barrier polymer, and the molten sealant polymer from the feedblock through an annular die to form a multi-layered extruded melt, wherein:
the molten transmission polymer is extruded as a transmission layer on the inside of the multi-layered extruded melt,
the molten sealant polymer is extruded as a sealant layer on the outside of the multi-layered extruded melt, and
the molten barrier polymer is extruded as a barrier layer in between the transmission layer and the sealant layer of the multi-layered extruded melt;

injecting an inert gas through a hole in the center of the annular die to cause the multi-layered extruded melt to expand into a bubble,
pulling the bubble continuously from the annular die;
dispensing at least one active agent in the interior of the bubble using an atomizer,
ablating one side of the interior of the bubble using a laser, and
collapsing the ablated bubble by pulling the bubble between a pair of nip rollers, wherein the bubble self-adheres to form the film.