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US5071675A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of applying liquid sizing of alkyl ketene dimer in ethanol to cellulose fibers entrained in a gas stream

Assignee: Weyerhaeuser Co
•
Filing: 1989-03-20
•
Granted: 1991-12-10
•
Expires: 2009-03-20
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Abstract

Abstract Cellulose fibers are entrained in a gaseous medium and sized while entrained with a sizing material. The sizing material may comprise a nonaqueous solution of alkyl ketene dimer or other sizing material. Also, immersions of fibers in such a nonaqueous sizing solution is another approach for sizing fibers.

Inventors

  • 👤 Maharaj K. Gupta
  • 👤 Amar N. Neogi
  • 👤 Richard H. Young, Sr.

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 16:51
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/17; D21H23/00; D21H23/02; D21H23/04

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 66 words
A method of sizing cellulose fibers comprising: entraining cellulose fibers in a gaseous medium with the gaseous medium transporting the fibers through a conduit in a fiber gas stream and at a velocity which is sufficient to avoid saltation of the fibers within the conduit; and applying a liquid sizing comprising alkyl ketene dimer in ethanol to the entrained cellulose fibers in the fiber gas stream.
Claim 2
Independent Claim 66 words
A method of sizing cellulose fibers comprising: entraining cellulose fibers in a gaseous medium with the gaseous medium transporting the fibers through a conduit in a fiber gas stream and at a velocity which is sufficient to avoid saltation of the fibers within the conduit; and applying a liquid sizing comprising alkyl ketene dimer in ethanol to the entrained cellulose fibers in the fiber gas stream.
Claim 3
Dependent Claim 13 words
A method according to claim 1 including the step of drying the fibers.
Claim 4
Dependent Claim 36 words
A method according to claim 1 in which the conduit is in the form of a loop and the fibers are recirculated through the loop a plurality of times for repeated application of the liquid sizing.
Claim 5
Independent Claim 30 words
A method of sizing cellulose fibers comprising: entraining cellulose fibers in a gaseous medium; and applying a nonaqueous solution of alkyl ketene dimer in ethanol to the entrained cellulose fibers.
Claim 6
Independent Claim 30 words
A method of sizing cellulose fibers comprising: entraining cellulose fibers in a gaseous medium; and applying a nonaqueous solution of alkyl ketene dimer in ethanol to the entrained cellulose fibers.
Claim 7
Dependent Claim 31 words
A method according to claim 4 in which the applying step comprises the step of coating the cellulose fibers with approximately one to twenty percent by dry weight alkyl ketene dimer.
Claim 8
Dependent Claim 29 words
A method according to claim 5 in which the applying step comprises the step of coating the cellulose fibers with approximately twenty percent by dry weight alkyl ketene dimer.
Claim 9
Independent Claim 32 words
A method of sizing cellulose fibers comprising: entraining cellulose fibers in a gaseous medium; and applying a nonaqueous liquid sizing material comprising alkyl ketene dimer in ethanol to the entrained cellulose fibers.
Claim 10
Independent Claim 32 words
A method of sizing cellulose fibers comprising: entraining cellulose fibers in a gaseous medium; and applying a nonaqueous liquid sizing material comprising alkyl ketene dimer in ethanol to the entrained cellulose fibers.
Claim 11
Independent Claim 23 words
A method of sizing cellulose fibers comprising the step of applying a solution of alkyl ketene dimer in ethanol to the cellulose fibers.
Claim 12
Independent Claim 23 words
A method of sizing cellulose fibers comprising the step of applying a solution of alkyl ketene dimer in ethanol to the cellulose fibers.

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-12-09 1995-06-10 1995-12-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-12-09 1999-06-10 1999-12-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-12-09 2003-06-10 2003-12-10 $7700.00 Window Closed / Lapsed

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