Paper making and fiber liberation – Processes and products – Running or indefinite length work forming and/or treating...
Reexamination Certificate
1998-09-08
2001-03-20
Silverman, Stanley S. (Department: 1731)
Paper making and fiber liberation
Processes and products
Running or indefinite length work forming and/or treating...
C162S217000, C162S363000, C162S364000, C162S368000, C162S357000, C492S048000, C492S020000, C492S007000, C029S895230
Reexamination Certificate
active
06203666
ABSTRACT:
BACKGROUND ART
1. Technical Field of the Invention
The present invention relates to the manufacture of sheet form articles having paper webs, such as paper or wet non woven cloths or the like, and in particular, relates to a method and device for the manufacture of paper webs, and further relates to an exchange method for forming wires and the like.
2. Background Art
In conventional paper web manufacturing methods, various types of specialized formers were employed using fourdriniers and cylinder formers as a base, such as on-top formers, twin wire formers, inclined wire formers, suction cylinder formers, and the like. Furthermore, in conventional cylinder formers, as the speed increased, centrifugal force tended to operate, and the paper web formation became disordered, so that it was necessary to either apply a suction force to the inner surface of a cylinder mold or to apply a pressurizing force to the outer surface of the cylinder mold in order to reach a balance with the centrifugal force. For this reason, various types of suction, pressurization, and depressurized or pressurized cylinder formers have been developed.
In all of these depressurized or pressurized cylinder molds a backing wire (commonly having a mesh within a range of 8-16) and a face wire (commonly having a mesh within a range of 50-80) are wound and affixed using silver solder to the outer circumference of a cylinder having a suction roll structure; however, fibers present in the paper stock, resin, sizing agent, filler and the like tend to be deposited in the gaps in the wires. Accordingly, particularly during times when paper stock is employed to which is added a large amount of filler (titanium dioxide, talc, calcium carbonate), the filler is the source of blockages in the openings of the wire or the suction roll, so that it is necessary to repeatedly stop the machinery and to clean the wire or the suction roll, or to exchange the wire, so that this creates a problem in that the operational efficiency declines. In particular, when suction rolls are employed, it is necessary to remove the roll cell, and to open the blockages in the opening one by one by inserting a hand-operated drill into the holes of the roll cell, so that the operational efficiency declines dramatically. For this reason, cylinder formers normally employ almost no filler, and are employed in the making of paper such as tissue paper, paper board, filter paper, or paper for electrolytic condensers.
However, in the case of paper for certificates, various types of paper for gold notes, paper for bank notes, and the like, there are limits to the expressive power of watermarks formed by suction box parts, or dandy rolls on a fourdrinier, so that it is still the case that watermarks produced by methods employing cylinder formers are employed.
However, when a method using a cylinder former to make watermarked papers is employed, the surfaces must always be kept perfectly circular, and the structure must be strong, so that both the face wire and backing wire are completely silver soldered to both end parts of the cylinder mold or the main body of the dandy roll, and removal thereof is difficult. Accordingly, it is difficult to prepare a plurality of varied cylinder molds or dandy rolls corresponding to the finished dimensions of the watermark design or the sheets, to exchange the cylinder molds with each respreading, and in order to maintain cleanliness, to store these in a storehouse or the like, and as a result, it is not merely the case that the exchange of the cylinder molds or the dandy rolls is a time consuming process, but the efficiency of use of the cylinder molds or dandy rolls is low, and there is also a problem in that a large amount of space is required for the storage of the cylinder molds or the dandy rolls.
SUMMARY OF THE INVENTION
In order to solve the problems described above, the present inventors have conducted investigations into methods and devices for paper web manufacturing for cylindrical face wires or dandy rolls or suction rolls in which, by means of appropriately detaching an outer sleeve and altering the diameter of the cylinder molds or dandy rolls, it becomes possible to remove the face wire of the cylinder mold or dandy roll and exchange it for a different face wire, and as a result, instantaneous responses are possible to changes in the production conditions, such as the type or freeness of the pulp, the temperature, the density, fillers, the amount of chemical additives, the type or weight of the paper, the watermark pattern or dimensions, or the speed of production.
As a result, in the process of production using a fiber suspension supplied in a flat film shape while rotating a cylindrical suction cylinder by gradually promoting dehydration using natural dehydration, pressurized dehydration, or suction dehydration and forming a paper web, and then moving the paper web to an endless felt by means of a suction couch roll, by detaching a tapered suction roll sleeve having an inner surface with the same inclination as the outer circumference of the tapered suction roll cell and having a cylindrical outer peripheral surface, it is a simple matter to execute the attachment and detachment of a variety of wires, and this solves the problems described above.
BRIEF DESCRIPTION OF THE DIAGRAMS
FIG. 1
is a side view and partial vertical cross-sectional view of a paper web manufacturing device in accordance with the present invention.
FIG. 2
is a cross-sectional view taken along the line X
1
—X
1
in
FIG. 1
of a paper web manufacturing device in accordance with the present invention.
FIG. 3A
is a cross-sectional view taken along the line X
4
—X
4
in
FIG. 3B
showing an example of a tapered suction roll sleeve in accordance with the present invention.
FIG. 3B
is a partial horizontal cross-sectional view showing an example of a tapered suction roll sleeve in accordance with the present invention.
FIG. 4A
is a side view and a partial vertical cross-sectional view showing an example of a tapered suction roll sleeve in accordance with the present invention.
FIG. 4B
is a partial horizontal cross-sectional view showing an example of a tapered suction roll sleeve in accordance with the present invention. Within the cylinder, an expanded view of the tapered hole and the connecting pins is shown.
FIG. 5A
is a partial horizontal view showing an example of the structure of the connecting parts of the ring of a tapered suction roll sleeve in accordance with the present invention.
FIG. 5B
is a partial vertical cross-sectional view showing an example of the structure of the connecting parts of the ring of a tapered suction roll sleeve in accordance with the present invention.
FIG. 6A
is a partial horizontal view showing an example of the structure of the connecting parts of the ring of a tapered suction roll sleeve in accordance with the present invention.
FIG. 6B
is a partial vertical cross-sectional view showing an example of the structure of the connecting parts of the ring of a tapered suction roll sleeve in accordance with the present invention.
FIG. 7A
is a side view and a partial vertical cross-sectional view showing an example of a tapered suction roll sleeve in accordance with the present invention.
FIG. 7B
is a partial horizontal cross-sectional view showing an example of a tapered suction roll sleeve in accordance with the present invention.
FIG. 8A
is a side view and a partial vertical cross-sectional view showing an example of a tapered suction roll sleeve in accordance with the present invention.
FIG. 8B
is a partial horizontal cross-sectional view showing an example of a tapered suction roll sleeve in accordance with the present invention.
FIG. 9
is a side view and a partial vertical cross-sectional view showing another example of a wire support method using a tapered suction roll sleeve embodying the method of the present invention.
FIG. 10
is a side view showing an example of a removal device for the tapered suction roll sleeve in accordance with the present invention.
FIG. 11
is a front view showin
Dilworth & Barrese
Halpern Mark
Silverman Stanley S.
Tokushu Paper Mfg. Co., Ltd.
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