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Mechanical process of building a laminate by bonding repeated
laminations, or layers, of material onto one another. If the layers have
a grain, such as in wood, they are often bonded with their grains at
different angles to achieve greater strength in the finished material.
Laminating processes can be classified according to the type of
bonding agent used to produce the laminates:
- In wet lamination the bonding agent is still in a liquid state
when the webs are joined together. It is commonly used to produce a
paper-aluminium foil laminate that is widely used in flexible
packaging
- In dry lamination, the bonding agent, dissolved into a solvent, is
applied on to the less porous and more heatsealable web, before being
evaporated in the drying oven. Then the adhesive coated web is
laminated to the other web under a strong pressure by means of heated
rollers to improve the bond strength of the laminate
- In wax lamination the bonding agent, wax or hot melt, is applied
in a molten state onto one of the two substrates. This process enables
to produce paper-paper or paper-aluminium foil laminates that are
widely used for packaging biscuits and bakery products in general
- Solventless lamination is a process where the adhesives used do
not contain solvents.
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Molding
- The guide to polymer processing technology,
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