Process for internally strengthening paper and board products an

Details Process for internally strengthening paper and board products an Process for internally strengthening paper and board products an

1987-11-05

1989-09-12

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

162183, D21H 344

Patent

active

048656917

ABSTRACT:
A new method for internally strengthening products formed from fibrous materials and the resulting products are provided. The method is characterized by the use of a wet-end additive and specifically a particular grade of polyvinyl alcohol which is super-hydrolyzed and which is substantially insoluble in water maintained at 130 degrees Fahrenheit. In addition, the polyvinyl alcohol particles have an extremely high hydrated bulk volume so that they form a highly stable suspension in water and which aids in achieving high retention of the particles in the web of the resulting product. The products formed by the method as described exhibit substantial improvements in strength properties.

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