CARTON BOARD

• US 20170182740A1
• Filed: 06/08/2015
• Published: 06/29/2017
• Est. Priority Date: 06/09/2014
• Status: Active Grant

• Current Assignee: BillerudKorsnas AB
• Original Assignee: BillerudKorsnas AB
• Inventors: Reuterhage, ke, Gsste, Anders, Byman, Johan, Bergstrm, Peter
• Granted Patent: US 10,086,585 B2
• Time in Patent Office: Days
• CPC Class Codes: B32B 2250/26 All layers being made of paper or paperboard
• CPC Class Codes: B32B 2255/12 on paper layer
• CPC Class Codes: B32B 2307/50 having particular mechanical properties
• CPC Class Codes: B32B 2307/51 Elastic
• CPC Class Codes: B32B 2307/54 Yield strength; Tensile strength
• CPC Class Codes: B32B 2307/546 Flexural strength; Flexion stiffness
• CPC Class Codes: B32B 2307/75 Printability
• CPC Class Codes: B32B 2439/62 Boxes, cartons, cases
• CPC Class Codes: B32B 29/005 next to another layer of paper or cardboard layer
• CPC Class Codes: B32B 29/06 specially treated, e.g. surfaced, parchmentised
• CPC Class Codes: B32B 7/022 Mechanical properties
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B32B 9/06 of paper or cardboard
• CPC Class Codes: B65D 5/4212 Information or decoration elements, e.g. content indicators, or for mailing B65D5/522 takes precedence
• CPC Class Codes: B65D 65/40 Applications of laminates for particular packaging purposes B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or
• CPC Class Codes: D21H 11/08 Mechanical or thermomechanical pulp
• CPC Class Codes: D21H 21/38 Corrosion-inhibiting agents or anti-oxidants

Abstract

A paper laminate comprising a first stretchable paper layer, a second stretchable paper layer and an intermediate paper layer arranged between the first and the second stretchable paper layer, characterized in that the stretchability (ISO 1924/3) of the first and the second stretchable paper layer is at least 5% in both the machine direction (MD) and the cross direction (CD) and the stretchability (ISO 1924/3) of the intermediate paper layer is less than 4% in the MD and/or the CD.

Claims

1. A paper laminate comprising a first stretchable paper layer, a second stretchable paper layer and an intermediate paper layer arranged between the first arid the second stretchable paper layer, characterized in that the stretchability (ISO 1924/3) of the first and the second stretchable paper layer is at least 5% in both the machine direction (MD) and the cross direction (CD) and the stretchability (ISO 1924/3) of the intermediate paper layer is less than 4% in the MD and/or the CD.

2. The paper laminate according to claim 1, wherein the stretchability of the first and the second stretchable paper layer is at least 6 or 7% in both the MD and the CD.

3. The paper laminate according to claim 1, wherein the density (ISO 534) of the intermediate paper layer is less than 0.8 g/cm³.

4. The paper laminate according to claim 1, wherein, the grammage (ISO 536) of the intermediate paper layer is between 75 and 500 g/m², such as between 100 and 400 g/m², such as between 150 and 350 g/m².

5. The paper laminate according to claim 1, wherein the intermediate layer is at least partly formed from pulp comprising mechanical pulp, thermomechanical pulp (TMP) or chemithermomechanical pulp (CTMP).

6. The paper laminate according to claim 1, wherein the internal bond, strength (Tappi 569) the first and the second stretchable paper layer is at least 400 J/m², such as at least 500 J/m², such as at least 600 J/m².

7. The paper laminate according to claim 1, wherein the geometric bending resistance (ISO 2493, bending angle=15°

, test span length=50 mm) of the intermediate layer is at least 40 mN, such as at least 50 mN.

8. The paper laminate according to claim 1, having a thickness (ISO 534) of 300-800 μ

m, such as 400-800 μ

m, and/or a grammage (ISO

     536) of 300-700 g/m², such as 350-600 g/m².

9. A blank provided with folding lines, which blank is composed of the paper laminate according to claim 1.

10. A package or part thereof comprising at least one wall composed of the paper laminate according to claim 1.

11. A package or part thereof comprising at least two walls composed of the paper laminate according to claim 1, which walls are joined by an edge defined by a folding lines formed in the paper laminate.

12. The paper laminate, blank or package according to claim 1 comprising a bulge or relief formed by stretching a portion of the paper laminate.

13. The paper laminate, blank or package according to claim 12, wherein the maximum height or the maximum depth of the bulge or relief is at least the same as the thickness of the paper laminate, such as at least 1.5 times the thickness of the paper laminate, such as at least 2 times the thickness of the paper laminate.

14. A box or part thereof comprising a bottom wall and at least two side wails composed of the paper laminate according to claim 1, wherein at least one of the side walls comprises a bulge or relief formed by stretching a portion of the paper laminate.

15. A lid comprising a top wall and at least three side walls composed of the paper, laminate according to claim 1, wherein the top wall comprises a bulge or relief formed by stretching a portion of the paper laminate.