Device for the production of corrugated cardboard with a single flat surface

(19)

(11)

EP 0 976 540 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	17.01.2001 Bulletin 2001/03

(43)	Date of publication A2:
	02.02.2000 Bulletin 2000/05

(21)	Application number: 99202474.5

(22)	Date of filing: 28.07.1999

(51)	International Patent Classification (IPC)⁷: B31F 1/28

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

30.07.1998 IT MI981780

(71)	Applicant: Ingg. Terzaghi & De Castiglione Industriale S.p.A.
	20063 Cernusco Sul Naviglio (Milan) (IT)

(72)	Inventor:
	Torretta, Gabriele 20147 Milan (IT)

(74)	Representative: Fusina, Gerolamo et al
	Ing. Barzanò & Zanardo Milano S.p.A, Via Borgonuovo, 10 20121 Milano 20121 Milano (IT)

(54)	Device for the production of corrugated cardboard with a single flat surface

(57) A device for the production of corrugated cardboard with a single flat surface, wherein the marks of the junction lines of the crests of the first permanently corrugated cardboard ribbon (8) with the second flat cardboard ribbon (10) are invisible and the cardboard's mechanical strength within the same is not reduced, in which the corrugating cylinders (2, 3) corrugate and preheat the first cardboard ribbon (7) and overlay it on the flat cardboard ribbon (9). The first contact between the two ribbons occurs on the heating cylinder (4), keeping only the second ribbon in a stretched and heated condition while the first cardboard ribbon is not subjected to any pulling or stretching force capable of altering it. The coupling thus occurs without the application of any direct or indirect pressure during the gluing process, which is the source of the undesired phenomenon.

Search report