(19)
(11) EP 0 145 499 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.12.1986 Bulletin 1986/52

(43) Date of publication A2:
19.06.1985 Bulletin 1985/25

(21) Application number: 84308718

(22) Date of filing: 14.12.1984
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 15.12.1983 US 561825
15.12.1983 US 561916
15.12.1983 US 561823

(71) Applicant: ETHYL CORPORATION
 ()

(72) Inventors:
  • Ray, Carl Douglas
     ()
  • Pollock, John Francis
     ()
  • Dinius, Richard Lee
     ()
  • Francis, Michael Allen
     ()
  • Raley, Garland Eugene
     ()

   


(54) Infusion bag


(57) 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 perforated thermoplastic film (11) having a heat resistant outer layer (21) of film forming res- ing 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.






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