Methods for manufacturing paper products
AssigneePaper Chemistry Laboratory, Inc.
InventorsJohn G. Penniman, Maria S. Reichlin
Life of this patent
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Abstract
Novel pulp, paper and paperboard manufacturing methods utilizing water-insoluble organic hydrocarbons. These hydrocarbons can be introduced into the pressing operation of the pulp, paper, or paperboard making machine or can be substituted for water at any point prior to the end of the press section. The result is a significant saving in dryer energy which can be translated to greater productivity in dryer-limited processes. The result is a significant saving in dryer energy which can be translated to greater productivity in dryer limited systems. Functional chemical additives may be dissolved, dispersed or emulsified in the hydrocarbon and thereby introduced into the web. Much less functional chemical additive is required than with wet end addition.
Claims15
A method for improving the rate of water removal of a paper product during its manufacture which comprises applying a solution consisting essentially of at least one water-insoluble liquid hydrocarbon at any point on a papermaking machine prior to the end of the press section in an amount sufficient to at least partially replace interstitial water in the web;
- and pressing the web in the press section to obtain a pressed web wherein some of the water has been replaced by hydrocarbon in order to improve water removal efficiency during the manufacture of the paper product.
In a paper produce manufacturing method on a papermaking machine which includes the steps of depositing pulp upon a screen to form a web of paper fiber, removing a portion of the water from the deposited web by pressing the web in press means having a press felt surface, and drying the pressed web;
- the improvement which comprises applying to the press felt prior to its passing through a press nip a sufficient amount of a solution consisting essentially of at least one water-insoluble liquid hydrocarbon for transfer to the web to at least partially wet the web so that on exiting said press nip a pressed web is obtained whereby some of the water therein has been replaced by hydrocarbon in order to improve the water removal efficiency during the manufacture of the paper product.
A method for increasing productivity of a press or dryer section limited papermaking machine by increasing the efficiency of water removal from a web of a paper product during one of pressing and drying which comprises applying a solution consisting essentially of at least one water-insoluble liquid hydrocarbon at any point on a papermaking machine prior to the end of the press section in an amount sufficient to at least partially replace interstitial water in the web;
- and pressing the web in the press section to obtain a pressed web wherein some of the water has been replaced by hydrocarbon in order to improve water removal efficiency during the manufacture of the paper product.
A method for improving at least one physical property of a final paper product which comprises applying a solution, dispersion or emulsion consisting essentially of a least one functional chemical additive incorporated in a water-insoluble liquid hydrocarbon at any point on a papermaking machine prior to drying in an amount such that after the web passes through a press nip of a press section, said additive and hydrocarbon have replaced at least some of the water in the web, and drying the web to obtain a paper product having at least one physical property which is improved by said additive.
A method for increasing the efficiency of transfer of a functional chemical additive to a web which comprises applying a solution, dispersion or emulsion consisting essentially of at least one functional chemical additive incorporated in a water-insoluble liquid hydrocarbon at any point on a papermaking machine prior to drying, in an amount such that after the web passes through a press nip of a press section, said additive and hydrocarbon have replaced at least some of the water in the web with the efficiency of transfer of said additive to said web being increased compared to a web which is not treated with hydrocarbon;
- and drying the web to obtain a paper product having at least one physical property which is improved by said additive.
Dependencies are inferred from the claim text.