Roll for treating webs, preferably webs of paper

Details Roll for treating webs, preferably webs of paper Roll for treating webs, preferably webs of paper

1985-07-29

1987-02-03

Goldberg, Howard N.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

291215, 29124, 29126, 29130, B21B 1302, B30B 300

Patent

active

046399909

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention relates to paper presses and more particularly to a web processing roll for the paper fabrication industry. In rolls of this type a roll shell is divided along its length or in other words along the roll axis into several zones. For operational considerations, it is required to control the temperature in each zone of the roll shell independently of the temperature in the other zones. This can produce a temperature profile over the length of the roll shell which is either very constant are or one in which the temperatures are deliberately different to produce a desired temperature profile.


PRIOR ART

FIG. 2 of German DE-AS No. 12 54 336 shows a stationary core supported via several annular partitions and, bearing annular seals located, on the inside of the roll shell. This suggested construction is not, in applicant's opinion, implementable because, due to the weight of the core, high frictional forces occur at the places where the partitions touch the roll shell during the rotation of the roll shell. Accordingly, the surfaces which slide on one another will wear out and locally occuring frictional heat will create zones with higher temperatures, which is undesirable. This effect is further aggravated if the roll shell experiences deflection, e.g. under its own weight or when loaded by a counter roll.
Other known roll designs avoid foregoing disadvantages by a core for supplying the heating medium which is rotating with the roll shell. Then, however, a complicated rotary head is required to couple the heating medium to the core (see FIG. 1 of German DE-AS No. 12 54 336).
From FIG. 9 of German DE-OS No. 31 28 722 illustrates another roll, with a shell provided with zone controllable temperatures. The stationary core of this roll is only supported at both its ends (in support stands not shown). The bearings for the roll shell are disposed on the core. With the cooperation of a counter roll, a press nip is provided (see FIGS. 2 and 8), through which a web of paper, moves in order to smooth it. The axes of the two rolls and the press nip lie in a so-called press plane. This roll is known as a so-called deflection-controllable roll, in which the stationary core is constructed as a heavy, massive deflecting support. On both sides of the press plane it bears a longitudinal seal which divides the annular space (between the core and the roll shell) into two semi-circular chambers. According to FIG. 9 of the above document, the semi-circular chamber associated with the counter roll is divided by means of several peripheral seals into several semi-circular chamber sections lying one behind the other in the direction of the roll axis. These chamber sections are acted upon by varying fluid pressures in order to achieve a specific deflection of the roll shell. The fluid pressures are used to control the loading pressure profile in the press nip (along the length of the roll shell). For treating a web of paper the web should be subjected to a specific caliber pressure cross directional profile, usually as uniform as possible.
According to FIG. 7 the other semi-circular chamber can also be divided into several chambers in a similar manner. In all known embodiments the peripheral seals have to be formed from circular segments. i.e. each peripheral seal can only extend from one longitudinal seal to the other or only around half the periphery of the roll. The peripheral seals are displaceable relative to the core perpendicular to the roll axis so that the deflection of the core and the deflection of the roll shell can differ from one another.
The fluid supplied to the individual chamber sections can be heated or cooled to different degrees. The intent is to impose different temperatures upon the roll shell in the various zones so as to change the external diameter of the roll shell in each zone by small amounts, in magnitudes of 1/1000 to 1/100 mm. This method is an attempt to control the profile of the loading pressure in the press nip along the length of the roll shell and consequently the c

REFERENCES:
patent: 3182587 (1965-05-01), Woodhall
patent: 3362055 (1968-01-01), Bryce
patent: 3643344 (1972-02-01), Strube
European Patent Application, 43119, 6-1981.

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