US 6,884,206 B2Granted

Method of producing a packaging material

AssigneeTetra Laval Holdings & Finance S.A.

InventorsRolf Lasson, Nils Toft

Life of this patent

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Abstract

A method of producing a packaging laminate (10) in which a web is provided with through-going holes (2) which are covered on one side with a first outer layer (3) on the one side of the web and with a second outer layer (4) on the other side of the web in such a manner that the first and second outer layers (3 and 4) are permanently sealed to one another within the regions of the opening contour of the through-going holes. In order to ensure the permanent seal between the two outer layers (3 and 4), the web is subjected, after application of the first outer layer but prior to application of the second outer layer, to so-called flame-treating whereby accessible parts of the first outer layer within the regions of the through-going holes (2) are activated or polarized by means of one or more gas flames directed at the other side of the web.

Claims14

Dependent claims

A method of producing a packaging laminate for a packaging container comprising a wall and an emptying opening including a through-hole penetrating the wall, the through-hole being covered on the outside of the container by a first outer layer of thermoplastic and on the inside of the container by a second outer layer comprising aluminum foil and a layer of thermoplastic, the first outer layer and second outer layer being releasably sealed to each other within the region of the opening contour of the through-hole by a pull or opening strip on the outside of the wall, the method comprising:

providing a web of paper or paperboard with through-holes;
covering the through-holes on a first side of the web with a first outer layer of a thermoplastic;
and
then covering the through-holes on a second side of the web with a second outer layer comprising aluminum foil and a layer of thermoplastic such that the first outer layer and second outer layer are sealed to each other within the regions of the opening contours of the through-holes by a sealing- or lamination layer extruded between the first outer layer and second outer layer.

1 more element

A method of producing a packaging laminate comprising a core layer with through-going holes which are covered by a first outer layer applied on a first side of the core layer, and a second outer layer applied on a second side of the core layer, the first and second outer layers being sealed to one another within the regions of the through-going holes, the method comprising:

providing a web of a core layer with through-going holes,
coating the second side of the web with a second outer layer including an aluminum foil facing towards the web and an outermost layer applied on the surface of the aluminum foil facing away from the web, and
thereafter coating the first side of the web with a first outer layer such a that the first and second outer layers are sealed to one another within the regions of the opening contour of the through-going holes and the aluminum foil and the outermost layer are disposed within the regions of the through-going holes:
wherein the web with the through-going holes, after coating with the second outer layer but prior to coating with the first outer layer, is subjected to flame-treating during which the web is caused to pass one or more gas flames directed at the first side of the web and accessible parts of the second outer layer are, to promote adhesion, activated or polarized within the regions of the through-going holes.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 10/258,969Filed 7 May 2001
Priority: SE 00016778 May 2000
Published: US 2003/0144123 A131 Jul 2003
Granted: 26 Apr 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

B32B 38/04
Ancillary operations in connection with laminating processes: punching, slitting or perforating
B65D 5/4279
Details of containers or of foldable or erectable container blanks: joints, seams, leakproof joints or corners, special connections between panels
B65D 5/72
Details of containers or of foldable or erectable container blanks: contents-dispensing means
B32B 37/153
With at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and…: at…