Folding boxboard

Recycled board

Solid board


Which paperboard is guaranteed for blisters or skin pack?

A blister pack is a semirigid clear PVC packaging that can take several different shapes and is heatwelded on a paperboard base. Blister packing is done applying a PVC valve to the paperboard through heat sealing. The product to be packed is set between the paperboard and the valve. On the market very few are the paperboard guaranteed for blister packing: only experience and expertise can guarantee successful blisters.

Which low-price paperboards are glossy on both sides?

Usually the paperboards on the market that are glossy on both sides are made with pure cellulose. If you are looking for a cheap paperboard glossy on both sides you are looking for an old product that Italian paper mills no longer produce, which was obtained through matching two recycled paperboards. We have one type of paperboard that is glossy on both sides, but it is available only in stocked pallet of size 72x102cm.

What’s the importance of the fiber orientation when designing a box?

When the paperboard is being produced, the fibers are preferentially aligned with the production direction of the paper machine (i.e. longitudinal direction). This means that the paperboard is stiffer and more resilient when it comes to the longitudinal direction. When the paperboard is cut long grain (longitudinal direction) the printing machine operates on a direction that is at right-angles to the production direction. For what concerns the creasing, it’s better to have a crease at right-angles to the production direction rather than in the same direction.

Is it possible for the paperboard to come into contact with moist or fatty food?

Even though a paperboard can be suitable for packing moist, dry or fat foodstuffs according to the certification issued by the paper mill it comes from, it is recommended that a functional barrier is placed between the food itself and the paperboard when packing moist of fat food.

Still, it’s a customer responsibility to use safely and as by law enacted the paperboard.

What is REACH?

The REACH regulation imposes that only the registered materials can be produced or imported within the European Union. Every producer or importer of materials must provide the ECHA (European Chemicals Agency) with a registration. Under this regulation, paper is not a material, but an article, that is “an object which during production is given a special shape, surface or design which determines its function to a greater degree than its chemical composition”.

More information can be found in our REACH declaration that is published in the form area of this website.

How is the paperboard classified? What do the acronyms mean?

According to DIN 19303, any paperboard can be described by a combined code of two letters or two letters and one figure. The first letter describes the type of surface treatment (A = cast-coated; G = pigment-coated; U = uncoated), the second letter stands for the main furnish (Z = bleached chemical pulp; N = unbleached chemical pulp; C = mechanical pulp; T = secondary fibre pulp with white, cream or brown reverse; D = secondary-fibre pulp with grey reverse) and the figure defines the colour of the reverse side (1 = white; 2 = cream; 3 = brown) with the exception of recycled paperboards, for which the figure describes the bulk of the paperboard (1 = ≥ 1.45cm3/g; 2 = between 1.3cm3/g and 1.45cm3/g; 3 = ≤ 1.3cm3/g).

Which paperboards for food meet the Italian law MD 21.03.73?

Not all the paperboards suitable for food meet the Ministerial Decree 21.03.73, as this law is more restrictive than EC regulations n. 1935/2004 and 2023/2006. For what concerns the suitability to hold food, the packaging needs to play all its characteristic roles – i.e. to contain, protect, carry, inform and promote – without modifying or interfering with the organoleptic properties of the food, without altering them.

In particular, for what concerns the MD 21.03.73 (and following amendments) those materials that are used to make packaging that comes in contact with food must have the chemical, physical and structural characteristics that guarantee

1. sanitary compatibility between the material itself and the food for what concerns inertia and transfer of products from the raw material;

2. a barrier towards gas (such as air, oxygen, carbon dioxide), water vapor, microbes, volatile substances as solvents for printing ink or glue;

3. absence of remaining scents.

According to the MD 26.4.73, we can divide food into two categories: this classification is based on the need of testing the transfer of toxic substances from the packaging to the food itself.

To the first group (A: food that need the migration test) belong, among others, food such as: fresh pasta, fresh pastries, melted cocoa, fresh fish, cut beef not packed, take-away pizza, cold cuts.

To the second group (B: food that don’t need the migration test) belong, among others, food such as: fresh fruit or cooled fruit, fresh vegetables, dry pasta, bread, cereals.

The paperboard packaging meant to hold them are to be produced according to the following principle: for the first group, paperboard to be used are made of at least 75% virgin fibre (raw fibrous materials), 10% top of charge substances, and 15% top of additional substances (not fibrous raw materials); for the second group, paperboard to be used are made of at least 60% virgin fibre, 25% top of charge substances, and 15% top of additional substances.

Is there any paperboard certified for microwave or freezer usage?

Some paper mills have tested and certified their product for particular use, such as for microwave cooking and freezer storage. For what concerns Korsnas products, certifications that prove the security of using the paperboard in the microwave (up till 150°C) and in the freezer (up till -30°C).

Ask for more information to our sales office.