FI116978B - Arrangement for cooling the edge area of a thermo roller - Google Patents

Description

Thermal roll peripheral cooling assembly

The present invention relates to fibrous web machines such as paper, board, pulp, tissue]. More particularly, the present invention relates to a cooling roll peripheral area cooling device for a fiber web pro: 5, which extends in a transverse direction of direction of the fiber web in the CD direction of the body: outside the web, and drill or brush; As used herein, the term "thermal roll" refers to a roll in a fiber web machine which, to exert a thermal effect, is heated on the inside of the thermal roll casing ull and / or by heating elements or ducts implemented in the casing.

15

Among other things, the problem with calendars thermo-rolls, especially soldering rolls; warming of the off-track area when the roll is heated to a fiber web, weft paper, pulp, cardboard, tissue or similar web. Warmer rad: The outer region, i.e. the peripheral region of the jacket, causes a change in diameter that starts at the end of the 20 rolls and extends in the direction of the length of the roll, also below the fiber web. oxbow phenomenon. The problem is now being addressed by pre-designing the internal structure and insulation of the roll. However, problems are not always • 1 ·, 1. · always eliminated by pre-planning.

Il • m • »» * # 1 '.: 25 It is not critical to eliminate uneven heating of the roll, and in particular to significantly increase the area outside the fibrous web, i.e., ················································ . Older calendars have an edge area • 1 with additional cooling to improve the situation, but the cooling effect of blowing it1 alone is not enough.

. . 30 * 1 · • · · 1 1. 1 It is also known to use water wetting, but to prevent water wetting ♦ · 2 edge wetting, which causes problems with the scroller.

It is an object of the present invention to eliminate or at least substantially reduce the known problems and their consequential effects, and another object of the present invention is to provide a novel arrangement for cooling the roll mantle 5 and thereby minimizing the formation of temperature differences in the roll mantle.

These and other objects related to the present invention have been achieved by an arrangement such as the one mentioned above, the specific features of which are set forth in the appended claim 10. Thus, the present invention is generally based on the basic idea of increasing the heat transfer surface area by selecting the depth and / or spacing of the recesses, bores or disks or the like.

The recesses increasing the heat transfer area, such as grooves or the like, are, according to the embodiment of the present invention, round-bottomed. According to the invention, it is advantageous to have at least one recess in the peripheral region, which is preferably a circumferential groove which extends in the peripheral region of the termc and rotates with respect to the geometric central axis of the thermal roll.

For other individual embodiments and advantageous features of the invention, the following specific part of the description of the invention and the dependent claims.

• »1 * .1.1 It is of particular importance both economically and in terms of the quality of the fiber web to be achieved. warming of the area outside the fiber web • 1! / ·· 25 control, calendar fiber profiling, because the error caused by calender i ·; 2: is smaller. In this case, the power of the profiling device can be concentrated ra <f1 · 1; profiling ti error management.

»1 • · 1 • 9 • 9 • 9 9

Among the advantages of the invention, it may be mentioned that even though the β · φ 30 cooling arrangement of the present invention alone and completely cannot eliminate the problems and consequent effects of the known cooling paths, the present invention can a. 1 shows a cooling arrangement according to a first embodiment of the invention; FIG.2 illustrates a cooling arrangement according to a second embodiment of the invention, FIG.3 illustrates a cooling arrangement according to a third embodiment of the invention, FIG.4 illustrates a cooling arrangement according to a fourth embodiment of the invention, FIG.4a shows a embodiment of a fourth embodiment of the invention FIG. 6 illustrates a cooling arrangement according to a sixth embodiment of the invention.

With reference to Figures 1,2,3,4,4a and 5, when the peripheral region 3 of the thermal roll 2 extends transversely to the direction of travel of the fiber web 10, i.e. the CD direction, outside the fibrous web web 3, a typical problem is excessive heating of the peripheral region 3. According to a primary aspect of the invention, in order to solve the problem, it is intended to cool the peripheral region 3 of the thermal roll 2 for processing the fibrous web 1 by a new arrangement to enhance the cooling.

15

1-5, the heat transfer surface area of the jacket end 4 and / or the jacket 2 of the thermo roll 2 is increased by a recess, drill or hook design 31, preferably by grooves, bores or the like, according to the general problem solution of the invention. area 3 and / or end 4 working with cooling enhancement means provided. Alternatively, a release ring may be mounted in the area of the sheath i β · # · β, the outer periphery and / or the end edge of which may be formed • · ».! * a similar recess, ridge, or drill design for which purpose o • ·· * is featured. . in accordance with the basic idea of the invention, add thermos when fitted to the periphery of the diaper • · ·

• M

* · The heat transfer area of the periphery of the jacket.

25 ♦ ♦ f »i« • l The heat transfer technique provides the advantage that depending on the width of the recesses, such as grooves 31, 32, 33, 34, bores, etc., in the periphery of the periphery of the jacket * · * ··· ' from their distance, the heat transfer area can be ** *! . * multiplies, which substantially enhances the cooling of the peripheral region 3 of the thermal roll 2.

:. ; 30 4

Referring to FIG. 1 illustrating a first preferred embodiment of the invention in an embodiment is in the peripheral peripheral region 3 and the end 4 of the jacket of the thermal roller 2: working: parallel circumferential and / or end recesses 31,41 which are preferably circumferential k and / or circumferential end grooves 41.

5

FIG. In the embodiment 1, the peripheral region 3 of the diaper has three cups 31; at the end is the main wall 41 one piece. It should be noted that, of course, the number of such circumferential grooves 31 as well as the number of ends 41 may vary considerably depending on e.g. the width of the peripheral region 3 and the size of the thermal roll 2, in particular the diameters 10

Referring to FIG. 2, another preferred embodiment of the invention is shown. In this embodiment, a plurality of circumferential recesses Rinn are machined to the peripheral peripheral region 3 of the diaper, preferably circumferential grooves 31 which rotate circumferentially or at intervals spaced apart from the peripheral edge 15 of the diaphragm 2, such as a circumferential groove 31. the thermal roller may be perpendicular or oblique to the central geometric axis.

In the embodiment of FIG. 2, the peripheral grooves 31 of the diaper 3 have circumferential grooves 31, and three cap ends 4 of the thermal roller 2 are not provided with specially machined cooling enhancements. , depending on eucalypts, e.g. 3 widths of the edge area,

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• ·· ·. . FIG. in the embodiment, the end of the jacket of the thermo roll 2 is not provided with • · 1 2 * 1 j recesses, which would of course be possible.

Refer to FIG. 3, which shows a third preferred embodiment of the invention. In the embodiment, the thermal roll 2 has no machined recesses in the peripheral region 3 of the jacket which could serve as means for enhancing the cooling of the peripheral region 3.

2 ·; a circumferential end groove is machined at the end of the outer peripheral region 3 of the diaper, the first groove of the mounting groove • «· v · 30 37. kehäreneas. The square 5 also passes through the outer periphery of the ionlca, whereby the end 4 of the thermo roll 2 is not provided at all with special cooling-enhanced means.

In addition, a second release ring 44 may be mounted on the end 4 of the thermal roller 2 having three circumferential end recesses 41 on its end face 5, delimited by four shear patterns. The head may be mounted either in the same end groove as the first release ring 37 or in the straight end as in FIG. When the end ring 44 is installed, the end grooves 44 may be omitted from the end recesses 44, which are concentric to each other and may be omitted from the end recesses 44, which are concentric to each other.

Reference is made to Figure F1G.3. To enhance cooling of the peripheral area 3 of the thermal roll 2, the desired number of recesses 15 are machined directly to the end of the thermal roll peripheral 3 as well as to the periphery, e.g., two end recesses 41 and three Kaj circumferential recesses 31.

You change, but the peripheral area 3 of the jacket of the thermal roller 2 is not equipped with special machining means for enhancing cooling. It is to be noted that, of course, the end grooves 41 '20 may differ considerably depending on the aforesaid numbers, in particular on the size of the thermal roll 2, Ki B # diameter.

• * · * ♦ • * *. . Referring to FIG. The edge region 3 of the diaper can be traced, preferably the position · · ·! ring elements, such as loose rings, provided with parallel circumferential and / or * *, 25 end recesses 31.41, which, like the periphery of the diaper, form a ke! \ * end recesses 31,41, fitted to the periphery of the diaper, preferably circumferential wed * 4 ***** and / or circumferential end wall 41. The circumferential recesses 31 ki of the peripheral region 3 of the diaper cover the diaphragm 2 of the thermo roll 2 at even intervals or at intervals * ♦ · • · 'The geometric level passing through such recess 31 can be achieved by cooling the geometric 44 «m λ 6 of the thermo roll 2 e.g. with suitable circumferential and / or end ring material The desired or optimum freezing power can also be achieved by using the cooling enhancement means spraying to form circular shapes on the periphery and / or end of the thermal roll. 5 especially metal spraying can completely or partially fill the peripherally machined peripheral and / or end cavities of the thermal roller for optimum cooling performance

Referring to FIGA, a fourth preferred embodiment of the invention is shown; in the embodiment, the peripheral region 3 of the diaper has a machined recess which is an advantage 10 a helical groove which spirally rotates the peripheral region 3 of the diaphragm 2, such that the tangent or angle of rotation of the thermo roll 2 with respect to the geometric angle.

In the embodiment of FIG. 4, the peripheral region 3 can be covered with only one spire 15 and an optional number of circumferentially extending recesses, such as the end groove 41, can be formed at the end of the thermo roll 2. FIG. 4 is illustrated with dashed one. depending on the aforesaid number, in particular, the size of the thermal roll 2, as it would split in]. Also, a plurality of spiral grooves 32 may be formed in the peripheral region 3

Referring to Figure 4a, which illustrates an alternative tot * · * * of the embodiment of Figure 4

In the embodiment of Figure 4a, a plurality of parallel and rotatable • «· \ · ψ are machined into the peripheral region 3. recesses 33, which are preferably helical grooves, which rotate or pass through the wave ♦ · *! circumferentially spaced or optionally spaced apart by a thermal roll 2 * ·. 25 edge regions 3. In this case, the tangent or rotation angle of each recess 33 with respect to the thermotube may be continuously constant or variable with respect to the central geometric axis.

Reference is made to Fig. 5, which shows a fifth preferred embodiment of the invention. In this embodiment, a plurality of rims are machined into the peripheral peripheral region 3 of the sheath of the thermal roll 2 * * ** ***** 30 SWinnvlfsiS intlra nvat wlulliepcti nitVittSicima loose lnilWirat iralintviietpn. 4a, also rotatable or wavy with respect to the geometric center axis of the thermo roll 2, wherein the longitudinal groove tan may be continuously constant or variable with respect to the geometric center axis of the thermo roll.

According to the invention, further cooling can be achieved by adjusting the thermotel; a separate peripheral area cooler 5, which is schematically illustrated in FIG. 1 dashed line. It should be noted that, to achieve equivalent operation, the implementations of the cooler 5 may differ significantly from one another. Thus, it is necessary for the cooling medium to direct the flow of the cooling medium only to either the peripheral area of the thermal roll 3 or the pi 10 to both the peripheral area 3 and the end.

It should be noted that what is relevant to the present invention is the heat transfer efficiency of what is selected for forming the heat transfer enhancement means, since a suitable machining method can be selected from the prior art such as milling, turning, drilling, etc., for the desired enhancement means.

The invention has been described above by way of example only, with the aid of some preferred embodiments thereof, and as will be appreciated by those skilled in the art, many alternatively functionally equivalent solutions and modifications are possible. within the scope defined by the appended claims.

I »I 4 · * · * · I« · \. Thus, the end 4 of the thermo roll may be directly or through the jacket 2 of the thermo roll 2 have a flow connection of heat transfer medium, e.g. cooled liquid or more preferably vaporous J 25 gaseous medium, to the periphery 3 of the jacket 2 of the thermo roll 2. enhancement means 31,32, 33, 34, such as grooves, bores, etc., for conducting heat transfer medium from the end of the thermo roll to the periphery of the thermo roll casing, thereby enhancing the cooling of the periphery of the thermo roll casing. Figure 6 hav; :. * cooling enhancement means provided by bore 35 boreholes 35, which are provided by * 7 ιγοιμπ Iranffn a. .. ;; ta ._____ .. - A - ~ ____ Λ 1 1

Claims (11)

A cooling arrangement for the peripheral region (3) of a thermal roll (2) for processing a fibrous web, the peripheral region of the jacket of the thermal roll extending in the transverse direction of the fibrous web (15) outside the fibrous web and having a heat transfer surface k recesses, bores or shafts which serve as cooling enhancement means (31, 32, 33, 34, 35, 36, 37, 41.44), characterized in that the heat transfer area is increased by recesses, bores or shafts (31,32,33). , 34.35, 3) 10 44) by selecting the depth, width and / or spacing. A cooling arrangement according to claim 1, characterized in that the depth (31, 32, 33, 33, 34,41), such as a groove or the like, is circular. Cooling arrangement according to Claim 1 and / or 2, characterized in that the periphery (3) of the jacket has at least one recess, preferably circumferentially 33), which runs along the periphery of the thermo roll (2) and rotates the geometry of the thermo roll. A cooling arrangement according to claim 3, characterized in that V, rotates helically with respect to the geometric center axis of the thermal roller (2) to form a spiral groove (32). • 1 · B • ♦ • · · • · · .. '.. I A refrigeration assembly according to claim 3, characterized in that there are a plurality of parallel recesses in the peripheral region of the tern • .e .. β.e 25 (2), preferably rinm # «\. I e threaded grooves (33) which rotate and cover at equal intervals or at optional intervals p £ • 1 circumferentially around the periphery (3) of the jacket of the thermal roll (2). «• ·« e · · '11 / Cooling arrangement according to one of Claims 3 to 5, characterized in that the plane or tangent passing through the 1 9 1 recess is perpendicular or oblique to the center axis of the thermal roller (2). Cooling adapter member a according to Claim 1 and / or 2, characterized in that the peripheral area (3) of the shell of the thermo roll (2) has a plurality of parallel recesses, <longitudinal grooves (34) extending straight and spaced apart or spaced apart circumferentially around the periphery (3) of the jacket of the thermal roll (2). Cooling arrangement according to Claim 7, characterized in that the geometrical plane i passing through the recesses 10, preferably the longitudinal groove (34) is parallel or at an angle to the central geometrical axis of the thermo roll (2). Cooling arrangement according to one of Claims 1 to 8, characterized in that the end (4) of the thermo roll (15) is in communication with the heat transfer means to the periphery (3) of the thermo roll casing via cooling enhancement means (31, 32, 33, 34, 37, 41, 44). A cooling arrangement according to any one of claims 1 to 9, characterized in that the heat transfer coefficient of the end ring (37,44) and / or the metal strip is high. · The heat transfer coefficient of the jacket of the thermal roller (2). * 1 1 • · • · 1.. A cooling arrangement according to any one of claims 1 to 10, characterized in that: the cooling of the peripheral region (3) of the thermal roll (2) is enhanced by a separate peripheral cooler (5) fitted to the end of the thermal roll (• · .. ..) • 1 «♦ ···« ♦ • · »• · 1 ·» 1 I * ·· • »mm ίο