Paper making and fiber liberation – Processes and products – Multi-layer waterlaid webs or sheets
Patent
1992-05-01
1992-12-08
Chin, Peter
Paper making and fiber liberation
Processes and products
Multi-layer waterlaid webs or sheets
162 9, 162125, D21H 2738
Patent
active
051694964
ABSTRACT:
The stiffness of multi-ply paper and board products is increased by dewatering the base ply on the papermaking machine to a consistency of at least about 8% prior to application of the next ply. The desired laminating consistency is more readily achieved through the use of pulp which has been subjected to a heat treatment process comprising heating the pulp at a temperature in the range of 170.degree. C. to 250.degree. in the presence of water for at least about 0.1 minutes, which reduces the water retention valve of the pulp. The heat treated pulp also produces a stiffer multi-ply product in its own right, which augments the stiffness advantage connected with attainment of higher laminating consistencies.
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Nelli Leo N.
Wagle Dinkar G.
Yasnovsky Vacheslav
Chin Peter
International Paper Company
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