Infusion bag.

摘要

An odorless and tasteless, stable and strong and sufficiently porous (even when wet) infusion bag for particulate food products such as tea, coffee and the like comprises a coextruded multilayer pertorated thermoplastic film (11) having a heat resistant outer layer (21) of film forming resing and an inner layer (22) of a somewhat less heat resistant film forming resin and having a multiplicity of minute substantially iniform holes (23) each of which is sufficiently small to prevent the migration of the particulate product therethrough and which are sufficiently large to permit adequate fluid flow therethrough. The heat resistant outer layer (21) of the film (11) forms the outside of the bag and the less heat resistant layer (22) of the film forms the inside of the bag.