Efficient grinding of cellulosic fibers for use as plastics fillers

Book · Sun Oct 01 04:00:00 EDT 1995

OSTI ID:109730

Moelder, T; Trass, O ^[1]

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1. Univ. of Toronto, Ontario (Canada). Dept. of Chemical Engineering and Applied Chemistry

Grinding of waste paper and rice hulls for use as reinforcing plastics fillers was studied using the proprietary Szego Mill in open circuit grinding as well as in combination with a high capacity classifier. Newsprint, office paper and glossy magazine paper have been used. Some test specimens were prepared with and without coupling agent and their properties measured. The importance of filler particle size on the mechanical properties of the product depends on the means used to compound paper and the plastic. In order to ensure good handling characteristics of the paper fibers during storage, feeding and subsequent molding, it is necessary to control both particle shape and top size. The Szego Mill product is relatively easy to feed and handle along with good size range control. Particle size distribution and bulk density of the products were determined after grinding and classifying under different operating conditions. Mill capacity and specific energy consumption depend strongly on particle size distribution of the feed and the desired top size of the product. For a rough estimate of mill and classifier performance, a production rate of 220 kg/h was reached while reducing newsprint particle size from 3,000 {micro}m to < 425 {micro}m in the SM-320 mill. Specific energy consumption was typically around 80 kWh/t.

• OSTI ID: 109730
• Report Number(s): CONF-950521--; ISBN 1-56676-313-4
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
36 MATERIALS SCIENCE
BULK DENSITY
ENERGY CONSUMPTION
EXPERIMENTAL DATA
FABRICATION
FILLERS
GRINDING
PAPER
PARTICLE SIZE
RECYCLING
REINFORCED PLASTICS
TENSILE PROPERTIES
WASTE PRODUCT UTILIZATION