Winding – tensioning – or guiding – Wound storage package – Convolute coil
Reexamination Certificate
1998-08-31
2001-01-30
Nguyen, John Q. (Department: 3653)
Winding, tensioning, or guiding
Wound storage package
Convolute coil
C242S520000, C242S532300
Reexamination Certificate
active
06179235
ABSTRACT:
FIELD OF THE INVENTION
This invention generally relates to the field of paper making, and more specifically, to paper rolls.
BACKGROUND
Generally, center feed rolls are used to dispense sheet material, such as paper hand towels or toilet tissues. Desirably, center feed rolls dispense material from their center rather than their periphery, as opposed to conventional rolls. During dispensing, the roll housed in a dispenser may be stationary as material is removed from its core.
Unfortunately, sometimes a center feed roll collapses inward towards its core during dispensing. In some cases, the collapsed material clogs the dispenser opening and prevents further dispensing. As a result, the dispenser is inoperable until the collapsed roll, which often must be disposed, is replaced.
Accordingly, there is a need for a center feed roll that resists core collapse thereby improving operability and reducing waste.
DEFINITIONS
As used herein, the term “comprises” refers to a part or parts of a whole, but does not exclude other parts. That is, the term “comprises” is open language that requires the presence of the recited element or structure or its equivalent, but does not exclude the presence of other elements or structures. The term “comprises” has the same meaning and is interchangeable with the terms “includes” and “has”.
The term “machine direction” as used herein refers to the direction of travel of the forming surface onto which fibers are deposited during formation of a material.
The term “cross-machine direction” as used herein refers to the direction, which is perpendicular and in the same plane as the machine direction.
As used herein, the term “cellulose” refers to a natural carbohydrate high polymer (polysaccharide) having the chemical formula (C
5
H
10
O
5
)
n
and consisting of anhydroglucose units joined by an oxygen linkage to form long molecular chains that are essentially linear. Natural sources of cellulose include deciduous and coniferous trees, cotton, flax, esparto grass, milkweed, straw, jute, hemp, and bagasse.
As used herein, the term “pulp” refers to processed cellulose by such treatments as, for example, thermal, chemical and/or mechanical treatments.
As used herein, the term “nonwoven web” refers to a web that has a structure of individual fibers which are interlaid forming a matrix, but not in an identifiable repeating manner. Nonwoven webs have been, in the past, formed by a variety of processes known to those skilled in the art such as, for example, meltblowing, spunbonding, wet-forming and various bonded carded web processes.
As used herein, the term “moisture” refers to a liquid, desirably aqueous, diffused or condensed in a relatively small quantity.
As used herein, the term “basis weight” (hereinafter may be referred to as “BW”) is the weight per unit area of a sample and may be reported as gram per meter squared and abbreviated “gsm”.
As used herein, the term “roll core” refers to the hollow region at the axis of a center feed roll. This region increases in size as sheet material is dispensed from the roll.
SUMMARY OF THE INVENTION
The problems and needs described above are addressed by the present invention, which provides a center feed roll. The center feed roll may include a wound sheet material having lessened wound tension due to exposure to moisture. This exposure may prevent the inward collapse of sheet material into the core of the center feed roll. Furthermore, the center feed roll may be exposed to humidity thereby increasing the moisture in the center feed roll. Moreover, the moisture may be applied by spraying a liquid. In addition, the liquid may be water, a starch solution, or an adhesive solution. Also, an effective amount of water may be added to the center feed roll for preventing the roll from collapsing inward.
A further embodiment of the present invention is a process for making a center feed roll collapse resistant. The process may include the steps of providing a center feed roll having rolled sheet material and exposing the rolled sheet material to moisture. Afterwards, the sheet material may release wound potential energy thereby lessening tension within the center feed roll and preventing the collapsing of the center feed roll during dispensing. Furthermore, exposing the rolled sheet material to moisture may further include spraying liquid on at least one end of the center feed roll. Moreover, both ends of the center feed roll may be sprayed with liquid. Also, the liquid may be water, a starch solution, or an adhesive solution. What is more, an effective amount of water may be sprayed on each end of the center feed roll. Alternatively, moisture may be added to the center feed roll by exposing the roll to humidity. Still a further alternative, moisture may be added to the center feed roll during winding of the sheet material. Optionally, the moisture may be sprayed onto the edges of the sheet material while being formed into a center feed roll.
REFERENCES:
patent: 3823887 (1974-07-01), Gerstein
patent: 3853279 (1974-12-01), Gerstein
patent: 4487378 (1984-12-01), Kobayashi
patent: 5271575 (1993-12-01), Weinert
patent: 5281386 (1994-01-01), Weinert
patent: 5453070 (1995-09-01), Moody
patent: 5467936 (1995-11-01), Moody
patent: 5518200 (1996-05-01), Kaji et al.
patent: 5620148 (1997-04-01), Mitchell
patent: 5722608 (1998-03-01), Yamazaki
patent: 5746379 (1998-05-01), Shimizu
patent: 5849357 (1998-12-01), Andersson
Kimberly-Clark Limited
Nguyen John Q.
Sidor Karl V.
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