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Process for producing a wood pulp having reduced pitch content and process and reduced VOC-emissions

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  • Title:
    Process for producing a wood pulp having reduced pitch content and process and reduced VOC-emissions
  • Author: Speaks, Jerry R ; Campbell, Roger O ; Veal, Michael A
  • Description: The invention relates to a fibrous cellulosic pulp of reduced pitch and volatile organic compound content from which paper and absorbent products of reduced pitch content are produced. More particularly, according to the invention, wood particulates are subjected to a solvent extraction process that removes pitch, as well as other wood extractives, from the wood particulates that are then subjected to a pulping process to produce pulps of reduced pitch content. These pulps are processed into paper and absorbent products of reduced pitch content. The invention also relates to chemical and mechanical wood pulping processes for wood particulates that are virtually free of volatile organic compound emissions. Paper and absorbent products having reduced pitch content and enhanced properties, including increased tensile index, tear index, burst index, Scott Bond, smoothness, and stiffness. Further, pulps of the invention, although having slightly reduced brightness, are more responsive to bleach chemicals thereby permitting the use of less chemicals to achieve a specific brightness. The products are produced by a process that includes extracting wood particulates with a solvent for naturally-occurring volatile organic compounds and pitch. The extracted wood particulates are then pulped and formed into paper and absorbent products with enhanced properties. Due to the extraction of volatile organic compounds, the pulping and paperforming stages of the process are substantially free of emissions of volatile organic compounds that occur naturally in wood. Moreover, the extraction of pitch reduces or eliminates pitch fouling of equipment and permits the production of paper products of enhanced qualities.
  • Creation Date: 2002
  • Language: English
  • Source: USPTO Issued Patents
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