(19)
(11) EP 0 448 524 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.11.1991 Bulletin 1991/46

(43) Date of publication A2:
25.09.1991 Bulletin 1991/39

(21) Application number: 91830089.8

(22) Date of filing: 12.03.1991
(51) International Patent Classification (IPC)5: B31F 1/00, B31B 1/00, B65D 3/02
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR LI NL SE

(30) Priority: 19.03.1990 IT 1971590

(71) Applicant: IMBALLAGGI INVERNIZZI S.R.L.
I-20127 Milano (IT)

(72) Inventor:
  • Invernizzi, Francesco
    I-20127 Milano (IT)

(74) Representative: Cicogna, Franco 
Ufficio Internazionale Brevetti Dott.Prof. Franco Cicogna Via Visconti di Modrone, 14/A
20122 Milano
20122 Milano (IT)


(56) References cited: : 
   
       


    (54) Method for making fibre box-like containers and related covers, and containers made thereby


    (57) The present invention relates to a method for making fibre-box like containers and related covers, which comprises the steps of making a tubular body, (1) including superimposed sheets of a paper material, and stretching this tubular body by rollers (2) arranged at corner portions thereof, in order to cause the tubular body to assume a substantially parallelepipedal shape.
    The main feature of the invention is that the method further comprises the steps of: deforming, by a mold, (11,21) an axial end of the tubular body, so as to provide a substantially parallel edge band recessed with respect to the side surface of the tubular body, inwardly bending the corner regions in order to remove the material excess and, finally forming a cover having the same peripheral extension as the box-like body.






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