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Inverform

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Formable Solid Bleached Board

Inverform is a multi-layered product (solid bleached board, SBB), entirely based on fresh fibres. Specific fibre compositions are used for the various layers in the construction to optimise performance. The outer layers are dominated by hardwood fibres to promote smoothness and printability. The middle layer consists of softwood fibres for strength, flexibility and formability.

Product description

Inverform was specially developed for ready-made food packaging. It has exceptional formability, product consistency and unique stretch properties that make it ideal for the deep drawing technology used to shape trays and other packaging. Inverform is an uncoated substrate that can be coated, extruded or laminated. It is made from pure cellulose fibres sourced from sustainably managed forests and complies with FDA and other food hygiene packaging regulations.

End use

The specific properties of the product allow it to be used in the following areas.

Certifications Invercote & Inverform

Product related

ECF

PEFC credit material

FSC® Mix FSC-C110018

Food contact

Toy safety

Archiving
   

2778 PEFC

TUEV-COC-000232

EC 1935/2004,
EC 2023/20061),
American FDA,
German BfR

EN 71 Part 3,
ISO 8124-3:2010

ISO 9706
 

All fibres from sustainable and controlled sources in compliance with the EU Timber Regulation EC 995/2010.

Mill related

ISO 14001

ISO 9001

FSC® C. o. C.

PEFC C. o. C.

    
 

EcoVadis Platinum Standard2)
 

1) the GMP regulation, extended with CEPI GMP

2) EcoVadis Platinum Medal awarded in 2020 (top 1 procent of all companies assessed)

Our mills and products are certified according to a number of standards, ISO and forestry. These standards are indicated on each specification sheet, as well as if they are compliant with application specific standards such as food contact, toy and archive. For more detailed information about our certificates, visit iggesund.com/certificates.

Sheet grain direction

Grain results from the fact that fibers flowing onto the paper machine wire align themselves predominantly in the direction of their flow and the moving wire. The direction that is parallel to the flow of fibers on the wire is called the Machine Direction (MD). Direction perpendicular to the machine direction, or across the paper machine wire, is called the Cross Machine Direction (CD). Grain direction is called long-grain (or grain-long) when the longer sheet dimension is the same as, or parallel to, the machine direction. Shortgrain paperboard has its shorter sheet dimension parallel to machine direction. A diagram of each is below:

Inverform properties - both sides

Tolerances Methods/Remarks
Grammage (g/m²) 290-380 +/-6% ISO 536
ISO Brightness R457 - PS (%) 85 - ISO 2470-1
Moisture content (%) 8 +/-1.5 ISO 287
Cobb - PS (g/m²) 30 - ISO 535
Ply bond (J/m²) 160 ≥110 Tappi 569

Last updated 21 Jun 2021

Grammage dependent properties

Tolerances Methods/Remarks
Grammage (g/m²) 290 330 380 +/-6% ISO 536
Thickness (µm) 400 440 530 +/-6% ISO 534
Caliper (pt) 15.7 17.3 20.9 +/-5% ISO 534
Bending resistance L&W 15° - MD (mN) 400 570 800 -25% ISO 2493
Bending resistance L&W 15° - CD (mN) 160 210 320 -25% ISO 2493
Surface roughness Bendtsen - PS (ml/min) 400 400 700 - ISO 8791-2
Surface roughness Bendtsen - RS (ml/min) 600 600 800 - ISO 8791-2

Last updated 21 Jun 2021