CN1156196A - Single row type drying section for paper size expanding and contracting compensation - Google Patents
Single row type drying section for paper size expanding and contracting compensation Download PDFInfo
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- CN1156196A CN1156196A CN 96112779 CN96112779A CN1156196A CN 1156196 A CN1156196 A CN 1156196A CN 96112779 CN96112779 CN 96112779 CN 96112779 A CN96112779 A CN 96112779A CN 1156196 A CN1156196 A CN 1156196A
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Abstract
A drying section for a paper making machine includes a larger number of dryer sections, fewer dryers in each dryer section, and provisions for driving many of the dryers individually. The average number of dryers per dryer section is less than five and preferably less than four. By providing a small number of dryers per dryer section and driving many of the dryers individually, it is possible to more precisely compensate for stretching of the paper web in the initial stages of the drying process and to more precisely compensate for shrinkage of the paper web during the latter stages of the drying process.
Description
The present invention relates to the dryer section of paper machine, be specifically related to a kind of like this dryer section, it is in fact fully by tactic, and the single drier section that is covered by felt is formed above, and the drier number that can reduce comparatively significantly in each drier section compensates the flexible of paper web.
Here " dryer section " speech of using is meant the such part in the paper machine, and its receives the paper web of sending from squeeze section and extend to the paper web that dryer section is from then on sent always and reaches about 90～99% aridity.This paper web advances to several follow-up paper machine sections again from dryer section, and as calender, coating machine and back drier etc., as known to general, dryer section comprises son that several dryings that covered by felt jointly form section.In patent specification, " dryer group " or " drier section " speech is meant one group of drying that is coated with felt jointly, it is the situation exception of double drier section, here have the drier of top and bottom simultaneously, although they cover with felt respectively, in this technology, still regard as same " drier section ".
Describing in No. 53311672, United States Patent (USP) as this agent, in the dry run of paper web in the paper machine dryer section, is to stretch then promptly to shrink at first.This be because, though the Technology in Pressing of paper has had obvious improvement, the paper web of sending from squeeze section still only has 45% aridity approximately.Initial several dryings just are heated to paper web the temperature of moisture content start vaporizer gradually.In this initial period, paper web leaches its " Free water ", promptly is arranged in the water in sheet fiber gap, this paper web along with itself when machine direction advances to the downstream and stretch.After a while, the hydrone that will be present in the fiber itself along with dry run disengages, aforementioned process just conversely, and paper web begins to shrink gradually.
No. 5311672 patents of above-mentioned Voith company propose, the dryer section green end more nearby more do the forward running under power by between the drier section of upstream; And be than between those drier sections near least significant end that is dry end place what more lean on downstream part, then with the negative sense traction, just move with negative speed difference.
The inventor finds that above-mentioned prior art is not sufficient to the flexible of full remuneration paper web.Difficulty is because the drier section of this typical prior art is longer, generally comprises 6, the drier that covers with felt jointly more than 7 even 8 or 8.These are the speed operations of the common driers that cover of felt with identical unanimity, and the situation of single drier section be by single felt horizontal multiple thereon, be horizontal again on them in the situation of double dryer section with a pair of felt.No matter but be any situation, between any given drier section, it is consistent that the superficial velocity of all driers is actually, and is can't compensate paper web flexible within these drier ends itself.
All dryer section before this is noted that nineteen ninety are to be made of double drier section fully, and each drier section comprises 6 and more generally be to comprise 8 or 10 driers at least.This just makes each drier section on average at least about there being 7 and whenever can not be less than 6 driers.
After nineteen ninety, all double dryer section are as one man changed into the mixed form of single single drier section and/or single and double drier section.At present the overwhelming majority single drier sections of being installed each drier section comprise at least 5,6 or even 7, but be typically 6 driers the most.Under any situation in each drier section the average of drier still more than 5.What reflect this prior art state is No. 4934067, United States Patent (USP), and showing in its Fig. 1 has 6 respectively to contain 6 drier drier sections, promptly always has 36 driers.This part patent has reflected the level of mounted similar machine in actual machine that produces and the world wide.Similarly, the United States Patent (USP) of Voith company has shown a collection of single drier section by the felt covering for No. 5050317, and wherein the drier number in each drier section is 8 even nearly 10.The situation of relevant this respect also can be referring to No. 5177880, the United States Patent (USP) of Voith company.
In the situation that contains single drier section and double drier section with mixing, as in No. 5269074, the United States Patent (USP) reflect that each drier section still has 6 driers approximately.This part patent has reflected the layout of the drier in the dryer section of actual motion once more prevailingly.
Though also have some previous patent to describe the less drier section of super-dry device number, these patents belong to illustrative, do not reflect to require in the actual paper machine aridity of paper web is dried to 90～99% practicable Machinery Design from about 43%.To this, for example can be referring to No. 4982513, United States Patent (USP).
Like this, concerning current diameter is about 6 to 7 feet and the middle drying that the vacuum deflector roll arranged, when the length of paper web when any given drier Duan Zhongyuan surpasses 100 feet, can not in this dryer section, compensate it and stretch.The unique place that can carry out extend/retract compensation is the place, paper web transit zone between the drier section, and by tract being quickened or slow down, people just can make paper web eliminate it and relax and promptly stretched or compensate its contraction.But this is restricted equally again, promptly owing to be reluctant to emit the risk that increases the web breaks number of times, the drawing paper web that can not too exert oneself in the starting stage of drying.
For this reason, one object of the present invention is to provide a kind of like this dryer section, and it can compensate the flexible of paper web in the scope of each drier section itself.
Another object of the present invention is that a kind of like this dryer section is provided, it be according to for example use through the dryer section technology of practice test top coated with felt or the bottom coated with felt, or knockdown single drier section is configured to, and these drier section low prices and only need change profile and just can be used to compensate the flexible of paper web.
The above-mentioned purpose with other of the present invention can realize with the single drier section that felt covers by preferably including only top that according to the present invention wherein each drier section comprises that number needs the drying of much less.So just can the textural of dryer section and reduce must the felt number of periodic replacement on aspect two, do not go to consider that the drying one of trying hard to increase for cost saving traditionally reinstates the imagination of felt covering.
Opposite with the technology that has earlier, in dryer section provided by the invention, most dryer group comprise 3 and be at most 4 dryings.Each drier section has the horizontal felt separately that is overlying on the drying, and between each is to adjacent drier and the vacuum furnace under each drier, to provide continuous mutually top of arranging to be covered with the single drier section of felt, when paper web is wherein carried between section and section, basically can be owing to traction is interrupted in the adhesive transhipment.
The mean number of the drying in each drier section preferably 5 or still less, but the drying number in each drier section can be less to below 4 even 3.
Vacuum deflector roll of the present invention can be located at the utmost point neighbour near region of drying, for example only has 2～5 inches far away approximately from the surface of drying.But also this vacuum deflector roll can be located at apart from 1 foot of drying or farther place, at this moment should be located at a vacuum tank in the bag shape position that limits into drying and vacuum furnace.In addition, this vacuum furnace can be the sort of no interior arrangement the cellular type vacuum furnace arranged, vacuum wherein then is that the effect that vacuumizes that the vacuum tank by the vacuum furnace top that is positioned at these no interior arrangements provides produces.
Each drying of prior art in the same dryer group is to rotate with identical speed, and this is because they are to be covered and be driven by common felt together, or is mechanically connected to due to one or two driven tube goes up.The tangible difference of the present invention and prior art is, provide independently directly for the many dryer rolls in the drier section to drive, thus can not only between the drier section simultaneously can also within the drier section from a drier to the speed of regulating paper web another drier.
Another principle that the present invention proposes is from the number of green end towards the center of dryer section increase drying, then, to extend the number that reduces drying to its dry end along with dryer section in each drier section.Most importantly these characteristics can control the speed difference of drier to dryin-up point, and this starting stage and termination stage in dry run needs the most, need the degree of doing like this then less at dry selectively central area.
Other characteristics of the present invention and advantage can be by obtaining to understand to the description that the present invention did with reference to the accompanying drawings.
Fig. 1 schematically shows the first embodiment of the present invention.
Fig. 2 schematically shows the second embodiment of the present invention.
Fig. 3 shows the application of bright vacuum tank and along the situation of the evaporation paths of the length among Fig. 1 and Fig. 2 embodiment.
Fig. 4 shows the modification of the another kind of single row type dryer section of bright Fig. 1 and Fig. 2 embodiment.
Fig. 5 shows bright speed control from the drier to the drier.
Embodiments of the invention are described in detail in detail below.
Fig. 1 shows that bright dryer section 10 comprises nine the drier sections of numbering from I to IX, and each drier section I-IX has drying 12 and is located at vacuum furnace 12 between the drying 12 and below them, limits the single drier section that top is covered by felt.Each drier section I-IX horizontal stroke is coated with separately felt 16, and paper web 18 promptly has felt 16 to be pressed onto on the drying 12 in known mode with its bottom surface 20, simultaneously between the drier 12 and around guiding on vacuum furnace 14.The paper web 18 that last drier 22 is drawn from last drier section IX is looked other section that concrete condition directs into paper machine again, for example calender, coating machine, back drier and coiling machine or the like (not showing bright).
Notice that the drier number among the drier section I is 2; And the number of the drier 12 in all the other each section II-IX is respectively 3,4,5,6,5,4,3 and 2.In other words, the average of the drier in each section is 3.25.Secondly, paper web for the first time from squeeze section draw and with first drier, 12 joints of the first drier section I, the number of drier is minimum.The number of drier is cumulative towards the direction at dryer section 10 centers, reduces gradually then, make with dryer section 10 in the adjacent drier number of dry end be 2 or 3.
As indicated, this is obviously to be different from the promotion of imagining traditionally to be provided with rather than to be provided with less more drier in dryer section, to reduce the sort of practice of the number of felt 16, blanket roller 24 and other parts etc. in the dryer section.
In each drier section, on average include only 3.25 driers, dryer section 10 among Fig. 1 is different from and is that also it includes 9 drier sections in the prior art, is generally 4 or be at most 5 drier section and entirely for 6 drier sections in the single dryer section or be at most 7 drier section in this double dryer section that is proposed in the prior art.Should be noted that although the dryer section among Fig. 1 10 provides 3.25 driers of average out in each drier section, principle of the present invention is the average drier of those under 5.5 section of drier number that can be generalized in each drier section in general.
In dryer section 10 of the present invention, paper web 18 is heated at first, then start vaporizer process near the drier section I-IV of the more upstream of dryer section green end.At this, stretch when paper web is initial, thereby flexure, make it can not be suitably and fit on the outer surface of this felt securely on felt 16 crosses vacuum furnace 14 time.Will make like this that paper web breaks, paper web fold or damage the final mass of paper web with other form.
On the contrary, at the back of dry run several stages, for example when paper web carried out drying in drier section VI-IX, paper web at this moment may shrink.Must adapt to this contraction and prevent that paper web from breaking.
In order to compensate paper web stretching, extension and/or the fold and the breakage during the late stages of developmet of drying stage in early days, the present invention is also for many even provide drive unit separately for whole drier 12.These characteristics show as each drier 12 and are connected with separately driving mechanism 30, so just can provide the less velocity variations of drier to drier in same drier section.The driving mechanism 30 of drier itself is known in this technology, for example can from No. 5311672, the United States Patent (USP) of Voith company with No. 4820947 understand, the content in these two patents has been incorporated into this as a reference.
Though among Fig. 1 each drier 12 is shown bright its corresponding driving device that has, an independently drive unit is set for each drier.Exactly, importantly will take place to stretch or the contraction place is provided with this drive unit 30 assert, so that regulate and compensation is stretched and/or contraction.Should be noted that at this,, then this felt is stretched slightly, so just can eliminate relaxation, promptly eliminate the stretching, extension of paper web by the drier that quickens the downstream if felt 16 is fitted drying very tight.On the contrary, when the dry end of convergence dryer section, the drier because felt is being fitted tightly, felt itself is slightly stretched usually, downstream dryer is slowed down just might eliminate or loose paper web in certain stress, be used in combination several dryer group seldom and between these groups, do the negative sense traction, but the just contraction of full remuneration paper web.So just, be able on whole dryer section, realize the extend/retract character of paper web is carried out effectively and better control.
In this whole specification, comprise vacuum furnace when speaking of the driving of drier.Like this, no matter be drier or vacuum furnace or the two combination, can be driven and realize above-mentioned the be contraction of compensation paper web and/or the control that stretching, extension is done.
Fig. 5 shows bright a kind of dryer section 50, and the dryer section 10 among it and Fig. 1 is similar, comprises drying 12, vacuum furnace 14, each drier driver 30 and felt 16.Actual paper machine drive drier that section need use than shown in the figure more than 15, but Figure 15 has shown a kind of modification of dryer section of the present invention, wherein the drier number of each drier section is 2 or 3, and on average is about 2.5.Also note that each bar circuit 52 simultaneously, they are coupled to driver 30 on a central speed control or the adjuster 54, and principle according to the present invention is controlled the speed of each drier.
Similarly, Fig. 2 shows bright a kind of dryer section 60 with 11 numberings from I to X1 drier section, and each drier section includes felt 16, drier 12, vacuum furnace 14, blanket roller 24, driver 30, or the like.The dryer section 60 included drier hop counts that these 11 drier sections are formed are about 2 times even nearly 4 times of drier hop count seen in the common dryer section.
Fig. 3 shows that the present invention is not limited to shown in Fig. 1,2 and 5, vacuum furnace 14 is located at the neighbour place of drier 12.In other words, principle of the present invention is suitable for such vacuum furnace 62 and can realizes that these vacuum furnaces can be the vacuum furnaces of no interior arrangement with such vacuum furnace 62, and there is a suitable segment distance on the surface that they leave drying 12, for example 1～1.5 foot.The vacuum here is to be provided by vacuum tank 64, the vacuum that the latter provided make paper web at paper web-felt in fitting on the felt between the drier and around in service being held in of combining of vacuum furnace 62.
Equally, the present invention also be not limited to complete shown in Fig. 1,2 and 5 on top coated with the single row type drier section of felt.Specifically, can be as shown in Figure 4, Xu these drier sections can alternately be reversed mutually, make that the drier 12 in the box-shaped district 66 can be oriented among Fig. 2, allow drier among the 3rd dryer group III be arranged in the II group in the lower plane under the drier, and be positioned on these driers with vacuum furnace 14, as shown in the figure.The felt 16 here becomes a ring around drier by advancing below drier, caused a drier section that the bottom covers with felt, drier 12 in this section move towards rotation according to inhour, and the rotation that is covered with the clockwise trend of drying in the drier section of felt with top is opposite.
Although the present invention was described with respect to its special embodiment already, its many other modification and improved form and other purposes then are that the expert is cognoscible.Had better not be confined to particular content disclosed herein to the present invention for this reason, and only should limit its scope by the appended claim book.
Claims (20)
1. a kind of method of dry-web in the paper machine dryer section, the method comprises the steps:
Paper web was drawn dryer section with a collection of drier section, each drier section comprises a plurality of driers and is used for paper web is attached to corresponding felt on these driers, having the several at least driers in several these drier sections at least, is to have the mode of speed difference to come drive between making in the drier section from the drier to the drier; And
In these several speed of regulating between by the drier of drive from the drier to the drier, compensate the stretching, extension and/or the contraction of paper web.
2. paper web dry drying method as claimed in claim 1 is characterised in that: the method also is included in whole dryer section the stretching, extension and the contraction of paper web is controlled.
3. paper web dry drying method as claimed in claim 1 is characterised in that: have at least the included drier of certain a few drier section to be less than four.
4. paper web dry drying method as claimed in claim 1 is characterised in that: it also is included between the drier section regulates tractive force and compensates with further stretching, extension and/or the contraction to paper web.
5. paper web dry drying method as claimed in claim 1, be characterised in that: dryer section comprise one group near the green end that is positioned at it one group of drier section and be positioned near its dry end second group of drier section, the drier mean number in all these drier sections is less than five.
6. the dryer section used of paper machine, this dryer section comprises:
A collection of drier section, each drier section comprise that horizontal being layed onto of a collection of drier and at least one is used on these driers paper web is attached to felt on the drier;
Wherein the average drier number in each drier section is less than five.
7. dryer section as claimed in claim 6 is characterised in that: above-mentioned average drier number is less than four.
8. dryer section as claimed in claim 6 is characterised in that: above-mentioned average drier number is less than three.
9. dryer section as claimed in claim 6 is characterised in that: the number of the drier section in the whole dryer section is more than seven.
10. dryer section as claimed in claim 6 is characterised in that: the number of the drier section in the whole dryer section is more than nine.
11. dryer section as claimed in claim 6, be characterised in that: it also comprises a collection of independently drier driver, each drier driver and a corresponding driving device are coupled, also include simultaneously control described corresponding drivers rotating speed device, be used for producing from the drier to the drier velocity variations with the compensation paper web stretching, extension and/or contraction.
12. dryer section as claimed in claim 6, be characterised in that: this dryer section comprises near first group of drier section the green end that is located at it and is located near its second group of drier section of dry end, wherein along the machine direction of this dryer section, the drier number in the drier section one by one that described these driers Duan Zhongxiang continues increases in described first group of drier section and reduces in described second group of drier section.
13. dryer section as claimed in claim 6 is characterised in that: described drier section includes the vacuum furnace between the drier, limits the drier section that top is covered by felt.
14. dryer section as claimed in claim 6, be characterised in that: described drier section includes the vacuum furnace between drying, limit the drier section that top is covered by felt, vacuum furnace wherein is the vacuum furnace of inner no device and includes the external vacuum case and be used for the vacuum furnace of these no interior arrangements is vacuumized.
15. dryer section as claimed in claim 13 is characterised in that: it also includes adhesive transhipment structure and is used for transporting paper web between drier section and drier end.
16. dryer section as claimed in claim 13 is characterised in that: described vacuum furnace be inner no device the cellular type vacuum furnace arranged, it includes and is used for providing the vacuum tank of vacuum to vacuum furnace.
17. dryer section as claimed in claim 11 is characterised in that: last is that the rotating speed of all drier is all independently controlled by the drier driver to the drier section basically the most nearby to be arranged in this dryer section dry end.
18. dryer section as claimed in claim 6, be characterised in that: it also comprises a collection of vacuum furnace and a collection of independently vacuum furnace driver between drier, each vacuum furnace driver all is coupled with one of correspondence in these vacuum furnaces, also include the device that is used for controlling described corresponding vacuum furnace rotating speed simultaneously, compensate the stretching, extension of paper web or/and contraction to produce drier to the velocity variations of drier, wherein last is that the rotating speed of all drier is all independently controlled by the vacuum furnace driver to the drier section basically the most nearby being arranged in this dryer section dry end.
19. dryer section as claimed in claim 11 is characterised in that: in this dryer section dry end at least one group that contains last four drier sections the most nearby, be that the rotating speed of all drier is all controlled independently by the drier driver basically.
20. dryer section as claimed in claim 6, be characterised in that: it comprises and a collection ofly is located at the vacuum furnace between the drier and makes the corresponding one by one a collection of vacuum furnace driver that is coupled with this batch vacuum furnace, also include the device that is used for controlling described corresponding vacuum furnace rotating speed, compensate the stretching, extension and/or the contraction of paper web with the velocity transformation between producing from the drier to the drier, wherein in this dryer section dry end at least one group that contains last four dryer section the most nearby, basically the rotating speed that is all drier is all controlled independently by the vacuum furnace driver, makes the speed of these last four drier sections to descend or remains to the speed that is associated with the drier section of these four drier section fronts that is no more than.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96112779 CN1156196A (en) | 1995-10-18 | 1996-10-18 | Single row type drying section for paper size expanding and contracting compensation |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US544,710 | 1995-10-18 | ||
| CN 96112779 CN1156196A (en) | 1995-10-18 | 1996-10-18 | Single row type drying section for paper size expanding and contracting compensation |
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| Publication Number | Publication Date |
|---|---|
| CN1156196A true CN1156196A (en) | 1997-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96112779 Pending CN1156196A (en) | 1995-10-18 | 1996-10-18 | Single row type drying section for paper size expanding and contracting compensation |
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| Country | Link |
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| CN (1) | CN1156196A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102076906B (en) * | 2008-06-26 | 2012-07-11 | 西门子公司 | Determination of speed relations between driving groups of a paper machine |
| US9094832B2 (en) | 2010-02-02 | 2015-07-28 | Lg Electronics Inc. | Method of selectively applying a PDCP function in wireless communication system |
| CN108589409A (en) * | 2018-04-04 | 2018-09-28 | 陕西理工机电科技有限公司 | A kind of compound spraying method |
-
1996
- 1996-10-18 CN CN 96112779 patent/CN1156196A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102076906B (en) * | 2008-06-26 | 2012-07-11 | 西门子公司 | Determination of speed relations between driving groups of a paper machine |
| US9094832B2 (en) | 2010-02-02 | 2015-07-28 | Lg Electronics Inc. | Method of selectively applying a PDCP function in wireless communication system |
| US9456381B2 (en) | 2010-02-02 | 2016-09-27 | Lg Electronics Inc. | Method of selectively applying a PDCP function in wireless communication system |
| CN108589409A (en) * | 2018-04-04 | 2018-09-28 | 陕西理工机电科技有限公司 | A kind of compound spraying method |
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