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US 2004/0201128 A1Published application
Method of increasing output of poly(vinyl chloride) compounds blended from dry-blended powders
OwnerPeter W. Krause, Roman B. Hawrylkoinventors
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Abstract
Dry-blended powders of poly(vinyl chloride) can be extruded as much as 30% faster by replacing a poly(vinyl chloride) powder with another poly(vinyl chloride) powder with an Inherent Viscosity of about 3-35% higher. Unexpectedly, the reduction in bulk density of the product made by the replacement formulation is manageably small, less than about 8%. Poly(vinyl chloride) compounds from such replacement formulations so extruded at such higher speeds can save time, energy, and money for the polymer engineer.
Claims10
A method of increasing output of poly(vinyl chloride) compounds blended from dry-blended powders, comprising the steps of:
- (a) selecting a conventional dry blend formulation of poly(vinyl chloride) compound that comprises at least one poly(vinyl chloride) polymer in powder form and additives;
- (b) replacing, in that conventional dry blend formulation, one poly(vinyl chloride) polymer powder of a given Inherent Viscosity with a replacement poly(vinyl chloride) polymer powder having an Inherent Viscosity about 3 to about 35 percent higher to provide a replacement dry blend formulation;
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- (c) extruding the replacement dry blend formulation through a profile die at a speed of as much as about thirty percent (30%) faster than the extrusion speed for the conventional dry blend formulation.
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