- Practical Guide -
Page 108 of 153
Extrusion or co-extrusion coating
: Process by which a molten polymeric material is forced
(extruded) through a die positioned immediately above the nip between a supporting roll and
chill roll and drawn down into this nip, where the molten film comes in contact with the
moving web of the substrate. The polymer is solidified by cooling in the nip and remains
tightly bonded to the substrate. When two or more polymeric materials are melted in two or
more separate machines (extruders) and the melts are forced through one single die the
process is called co-extrusion coating.
ot melt coating
: Process by which a molten mixture of waxes, polymers or other film
forming materials is applied by means of rollers or dies onto the moving web of the substrate,
where it is solidified by cooling and remains tightly bonded to the substrate.
Hot melt coated paper or board does not come within the field of application of Directive 2002/72/EC.
Paraffin or wax coating
: Process by which a molten paraffin or wax is applied by rollers or
curtain onto the moving web of the substrate, where it is solidified by cooling.
Note: Paraffin or wax coated paper or board does not come within the field of application of Directive
: Process by which a layer of mineral or artificial pigments, together with
binders and other additives, is applied in the form of a slurry (coating slip) onto the moving
web of the substrate.
Note 1: This process is commonly used during paper or board production and is usually described as 'paper
Note 2: This type of coated paper or board does not come within the field of application of Directive
2002/72/EC and therefore is not seen as a polymeric coated material.
2.2.2 Laminating: Process by which two or more layers are joined together by a layer with an
adhesive function to form a multi-layer structure.
Note 1: In the case of paper and board the adhesive layer can be, for example, a dispersion or solvent based or a
solvent free adhesive, an extruded polymer, a hot melt, a wax, or a paraffin.
Note 2: In some countries the laminating process is called lining, when a surface layer of paper, plastics film,
metal foil or any other material is pasted with an adhesive onto one or both sides of paper or board.
2.2.3 Impregnation: Process by which a moving web of an absorptive substrate is immersed in a
liquid, which penetrates into the substrate. This can either be molten wax or paraffins or a
dispersion of waxes, paraffins or polymeric materials.
Note: Film forming does not usually occur. Impregnated paper and board does not come within the field of
application of Directive 2002/72/EC.
2.3.1 Coated product: Two or more layers of different materials produced by means of a coating
process as mentioned under 2.2.1.
2.3.2 Coated paper or board: Coated product (2.3.1) in which at least one layer is paper or board.
(See Note 126.96.36.199)