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Fibrous product for binding particles
| Details |
Inventors: Hansen, Michael R.; Young, Sr., Richard H.;
Assignee: Weyerhaeuser Company (Tacoma, WA)
Primary Examiner: Czaja; Donald E.
Assistant Examiner: Nguyen; Dean T.
Attorney, Agent or Firm: Christensen O'Connor Johnson & Kindness PLLC
Binder is applied to fibers during the production of a web on a wet laid sheet manufacturing line. Particles are bound to fibrous material by a binder that has a volatility less than water, wherein the binder has a functional group capable of forming a hydrogen bond with the fibers, and a functional group that is capable of forming a hydrogen bond or a coordinate covalent bond with the particles. The binder may be activated or reactivated by addition of heat, liquid, or mechanical energy such that fibers treated with binder may be shipped to a distribution point before particles are bound to the fibers. The binder may be a polymeric binder selected from the group consisting of polyethylene glycol, polypropylene glycol, polyacrylic acid, polyamides and polyamines, and in which the polymeric binder has a hydrogen bonding functionality or coordinate covalent bond forming functionality on each repeating unit of the polymeric binder. Alternatively, the binder may be a non-polymeric organic binder that includes a functionality such as a carboxylic acid, an alcohol, an amino acid, an amide, and an amine, wherein there are at least two such functionalities on the molecule, which may be the same or different functionality. Particles attached to the fibers in this manner are firmly adhered and are not easily dislodged. Fibrous products produced by this method include fibers to which particles are bound and may also include other fibers. |
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DETAILED DESCRIPTION The foregoing and other objects are achieved by providing fibers in a wet laid sheet manufacturing line, such as cellulose fibers with or without synthetic or other fibers being wet laid into a web or sheet.
The fibers include those with hydrogen bonding functional sites, with or without other fibers, to which a binder is applied to the fibers on the wet laid sheet manufacturing line.
The binder has a volatility less than water.
The binder also has a functional group that forms a hydrogen bond with the fibers having the hydrogen bonding functional sites, and a functional group that is also capable of forming a hydrogen bond or a coordinate covalent bond with particles that have a hydrogen bonding or coordinate covalent bonding functionality.
The binder is capable of attaching the particles to the fibers with the hydrogen bonding functional sites, and forms a bond that has been found to be resistant to mechanical disruption.
These particles can be added to the fibers during manufacture of the fibrous sheet on the wet laid sheet manufacturing line.
However, preferably the particles are not added until the fibers are processed by an end user during the manufacture of products.
Consequently, dislodgement of particles from fibers during shipment of the bulk fibers is eliminated.
In addition, customization by the end user is enhanced as the end user can add its desired particles to the fibers at the time the fibers are used.
Possible degradation of particulates during shipment and the delay prior to incorporation into products are also minimized.
A significant advantage of these binders is that the binders can be present on fibers in an inactive state at the wet laid sheet manufacturing line, then later activated or reactivated at a remote location (e.
g.
at a user's plant) to bind particles to the fibers.
In this application, the term "wet laid sheet manufacturing line" means a manufacturing line wherein a sheet or mat of fibers is formed from a slurry of fibers.
Typically, the slurry is deposited on a wire from a source, such as a headbox, and the fiber sheet is dried on the line
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Manufacturing Materials 
