Method for Manufacturing Reduced-Weight Paper, Thin Cardboard and Cardboard, and Compounds Obtained Therewith
AssigneeLecce Pen Company S.r.l.
InventorClemente Nicolucci
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Abstract
The invention concerns a compound for manufacturing paper or cardboard, comprising a mixture of cellulose fibres and heat-expandable substances suited to generate closed microbubbles, in water dispersion, and wherein the mixture also contains additive substances like bonding agents, mineral fillers, coatin starches.
Claims18
1) Water dispersion for manufacturing paper or cardboard of reduced specific weight comprising cellulose fibres, thermally expandable thermoplastic microspheres in an amount of 4.1% to 20.1% by weight and a cohesion agent.
9) Method for manufacturing paper or cardboard of reduced specific weight with the following steps:
- a) preparing a water dispersion of a mixture of cellulose fibres and thermally expandable thermoplastic microspheres in an amount of 4.1% to 20.1% by weight,
- b) addition of a cohesion agent to the water dispersion,
- c) drying of the water dispersion to form a a paper or cardboard panel at a temperature above 110° C.
18) Use of thermally expandable thermoplastic microspheres as substitution for cellulose fibres and/or to reduce weight in paper or cardboard.
Dependencies are inferred from the claim text.