CN1440480A - Method for producing thin tissue paper by improved traditional wet press - Google Patents

Abstract

A tissue sheet is made using a modified wet pressing machine in a modified wet pressing process employing an integrally sealed air press. After initial formation and conventional vacuum dewatering, the wet web is conformed to the surface contour of a relatively coarse fabric to give the web a textured surface. By creating a pressure differential across the web of at least 30 inches of mercury and an air stream through the web of at least 500 SCFM/in<2>, the air press noncompressively dewaters the wet web to a consistency of about 30 to about 40 percent prior to a heated drying cylinder. The web is dried to substantially preserve its three-dimensional, throughdried-like texture. The process provides a web having an exceptionally high degree of bulk and absorbency not expected in wet-pressed products.

Description

On improved conventional wet press, make the method for tissue-towel

Technical field

Present invention relates in general to make the method for paper product.Particularly relate to a kind of method of on improved conventional wet press, making the cellulose paper web (cellulosic web) of high bulk density and high absorbent capacity.

Background technology

Usually there are two kinds of diverse ways to be used for making bottom (base sheet) as the paper product of paper handkerchief, napkin paper, tissue-towel, cleansing tissue and analog.These methods are commonly referred to wetpressing and impingement drying method.Although these two kinds of methods may be identical in the front-end and back-end of operation, after initial the shaping, but there is difference significantly in the mode that water is removed from wet web.

More specifically, in wetpressing, the new wet web that is shaped is sent on the woollen blanket (felt) of paper grade (stock) usually, when it is still supported by woollen blanket, presses steam heating type and raises on the surface of base (Yankee) drier then.When paper web is sent to when raising basic dryer surface, water squeezes out from paper web and is absorbed by woollen blanket.Then, the paper web that the took off water drying on the hot surface of Yang Keshi drier that has about 40% denseness usually.Then, paper web is creased with the softness that becomes, and final paper is produced stretch (stretch).A shortcoming of wetpressing is: the squeezing step increases the density of paper web, thereby has reduced the bulk density and the absorbability of paper.The step of creasing subsequently can only partly be recovered these paper performances that needs.

In the impingement drying method, the new paper web that is shaped is at first used vacuum dehydration, is sent to then on the paper web band of a relative porous, and makes hot-air pass paper web so that non-extruding ground is dry.Then, consequent paper web is sent to raise on the basic drier being used to and creases.Because paper web is being sent to when raising basic drier substantially dry, so the density of paper web can significantly not increase owing to transmission.And the density of the dry paper that penetrates is original just lower, and this is because dry when paper web is bearing in the through-air-drying fabric band.The shortcoming of impingement drying method is: the work capacity loss is higher, and the fund cost relevant with thru dryers is higher.

Because most existing paper machines adopt old wet compression, therefore, for the manufacturer, this is extremely important, that is: find the approach that improves existing wet press,, do not need to be used for the improvement expenses of the costliness of existing machine simultaneously with the satisfied low density products of prosumer.Certainly, wet press might be transformed into the impingement drying structure again, but this is not used because cost is too high usually.Be supply thru dryers and relevant device thereof, many complexity and expensive variation are necessary.In addition, the length of through-air drying paper machine is bigger, just needs other building or building is transformed.In some occasion, be unactual or impossible to building transformation, perhaps since influence other existing equipments or the influence in the useful restricted area in this place, expense very the costliness and be under an embargo.Therefore, people cherish great interest and manage under the prerequisite that does not significantly change Machinery Design to make great efforts to improve existing wet press.

In some cases, the press sections of improving the wet pressing paper machine is than improving the convenient economy of wet end, particularly under wet end and head box (headbox) situation in shape.In addition, old wet press can have the existing equipment relevant with the running of bottom woollen blanket, and they can easily be used for other purposes, thereby makes that transformation is simpler, even saves cost more.The invention discloses the simple method of transforming wet press, so that make the low density products of the consumer satisfaction that improves.

Special case as another form of implementation of the present invention, because many existing crescent formers (crescent-former) paper machine is arranged, they can use improved method to make the low density products of consumer satisfaction and acquire benefit the therefore special method that needs to transform the crescent former paper machine.Many old crescent former paper machines are provided with lower woollen blanket running (felt run), and it can be easily as other fabric running, to satisfy the needs of some embodiment of the present invention.The invention discloses the simple method that is used to transform the crescent former paper machine.

People such as Andersson in the United States Patent (USP) of announcing on July 27th, 1,993 5,230,776, described a kind of by improving wet press to produce the straightforward procedure of the paper handkerchief more soft, that bulk density is higher.This patent disclosure bring the replacement woollen blanket with the perforation of net type, and paper web (web) is clipped in forming net and between this perforated tape of pressure roller.This patent also discloses additional dewater unit, for example steam-line blowing, mouth of blast pipe and/or independent press felt, they can be placed in the scope of sandwich structure, so that further increase dry solids content (drysolid content) before raising basic drier (Yankee dryer).It is said that these additional drying devices allow this machine to equal the speed operation of impingement drying machine at least substantially.

Reduce the water capacity enter the paper web of raising basic drier, with the speed that keeps machine and prevent that paper web from bubbling or lack adhesiveness, this is very important.With reference to United States Patent (USP) 5,230,776, wherein use a kind of independent press felt, yet, the density of fabric is increased.Like this, because the density that independent press felt causes increases, will have a negative impact to paper web (web) bulk density and absorbability.

And being used to make the air-spray of fabric dehydration is not effective in removing moisture or energy efficiency aspect originally.Blowing air on paper is known to make it drying in the art, and can be used in the hood of raising basic drier so that convection stoving.Yet in raising the hood of basic drier, most air of nozzle ejection can not penetrate paper web.Like this, if be not heated to very high-temperature, most of air will be wasted, and not be used for effectively removing moisture.In raising the hood of basic drier, air is heated to 900 Fahrenheit temperature, and allows to be detained to finish drying for a long time.

Like this, lack in the art and what need is to utilize a kind of improved conventional wet press to make and compare with the impingement drying paper to have the practical approach of opening than the thin paper of high bulk density and higher absorption ability.

Summary of the invention

Have now found that, when keeping rational machine productivity, can produce and have and the same bulk density of similar impingement drying product and the wet pressing paper handkerchief of absorbability performance.Particularly, wet pressing cellulose paper web can be made like this, that is: by about 30% denseness is at the most arrived in wet web vacuum dehydration, then, use the integral sealing pneumatic shuttle to be dewatered to 30% to 40% denseness with making the non-extruding of paper.Then, preferably wet web is sent on " molded " webbing that replaces traditional wet pressing woollen blanket,, perhaps makes wet web have three-dimensional character so that give more multiform shape of wet web.Then, wet web preferably presses and raises basic drier in by molded webbing supporting and drying.The wet-bulk of the product of making thus and absorbability be than the wet-bulk and the absorbability height of traditional wet pressing towel and paper handkerchief, and identical with the wet-bulk and the absorbability of existing impingement drying product.

Here employed " non-extruding dehydration " and " non-extruding drying " refer to remove the dehydration or the drying means of water respectively from the cellulose paper web, it does not relate to compression clamping (compressive nip), or causes the density of part paper web significantly to increase or compress other step of a part of paper web during dry or dehydration.

Wet web is through molded three-dimensional character and the absorbability to improve paper web of wet method in this technology.The paper handkerchief of " wet method is molded " as used herein is meant: about 30% to about 40% denseness, consistent with the surface profile of molded webbing, then before optional additional drying device, by with come the dry paper handkerchief of making like this such as the opposite hot conductive drying device of other drying device of impingement drying machine and so on, as using heated drying cylinder.

Suitable the object of the invention " molded webbing ' comprise the papermaking fabric band without limitation, this papermaking fabric band presents tangible open area or three-dimensional surface profile, and it is enough to make paper web to have bigger deflection in the Z direction.This webbing comprises individual layer, multilayer or compound permeable structure.Preferred webbing has at least some features in the following characteristics: (1) contacts a side of (end face) with wet web at molded webbing, the per inch machine is (MD) strand number (order number) from 10 to 200 (every centimetre 3.94 to 78.74) vertically, and the strand number (number) of per inch transverse machine (CD) also is from 10 to 200 (every centimetres 3.94 to 78.74).The strand diameter is usually less than 0.050 inch (1.27mm); (2) at end face, the distance between the peak that the peak and the CD of MD joint save is from about 0.001 to about 0.02 or 0.03 inch (0.025mm is to about 0.508mm or 0.762mm).Between these two peaks, has the joint that forms by MD strand or CD strand, so that in the molded step of wet method, make paper form the configuration of three-dimensional peak/paddy outward appearance; (3) at end face, the length of MD joint is equal to or greater than the length of CD joint; (4) if webbing is a sandwich construction, so preferably bottom has thinner mesh than top layer, so that the degree of depth that the control paper web penetrates, and make the fiber of reservation maximum; (5) webbing is presented and make some joyful geometrical pattern of vision, this pattern is able to repetition every 2 to 50 warp thread usually.

Therefore, on the one hand, the present invention relates to be used for making the method for cellulose paper web, the step of this method comprises: (a) water slurry with paper fibre is deposited on first webbing of circulation, to form wet web; (b) wet web is dewatered to about 10% to about 30% denseness; (c) wet web is sent to second webbing of circulation; (d) wet web is clipped between second webbing and the supports fabrics band, and adopt non-extruding dewater unit that wet web is dewatered to about 30% or bigger denseness, because this non-extruding dewater unit and wet web form integral sealing, so it is fit to make pressure fluid mobile through paper web basically with about 5 pounds/square inch or bigger pressure (gauge); (e) paper web that took off water is pressed against on the dryer surface of heating, so that to the small part dry-web; (f) make the wet web that took off water be dried to final drying.

On the other hand, the present invention relates to make the method for cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre on first webbing of circulation, to form wet web, wherein this paper web; (b) wet web is sent to second webbing of circulation; (c) wet web is clipped between second webbing and the supports fabrics band, and wet web is dewatered to denseness up to about 30%; (d) use pneumatic shuttle that wet web is dewatered to about 30% to about 40% denseness additionally, because pressure fluid is mobile through fabric basically with about 5 pounds/square inch or bigger pressure; (e) second webbing is configured to like this: can provide less than the not supported paper cornerite of 90 wet webs that took off water of spending around pressure roller; (f) paper web that took off water is pressed against on the dryer surface of heating, so that took off the wet web of water to the small part drying; (g) make the wet web that took off water be dried to final drying.

On the other hand, the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre on first webbing of circulation, to form wet web; (b) wet web is dewatered to denseness up to about 10%; (c) wet web is sent to second webbing of circulation; (d) wet web is clipped between second webbing and the supports fabrics band; (e) second webbing of utilization between wet web and gathering-device, make the wet web that is clipped between second webbing and the supports fabrics band by between gas boosting chamber and the gathering-device, this gas boosting chamber and gathering-device operatively associate, and be applicable to produce pass wet web, about 30 inches of mercury or bigger pressure reduction, and pass wet web, about per square inch 10 standard cubic foots of per minute or bigger flow of pressurized fluid; (f) use flow of pressurized fluid wet web to be dewatered to about 30% to about 40% denseness; (g) by second fabric paper web that took off water is pressed against on the dryer surface of heating; (h) make the wet web that took off water be dried to final drying.

On the other hand, the present invention relates to improving one's methods of a kind of conventional wet press with at least one woollen blanket and squeeze dehydration unit, this method comprises: (a) replace at least one woollen blanket with at least one webbing; (b) replace squeeze dehydration unit with extruding dewater unit non-heat, non-.Wet pressing processing and the equipment described in the people's such as Tapio that announce on February 13rd, 1979 the United States Patent (USP) 4,139,410, at this by with reference to incorporated.

On the other hand, the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre on first webbing of circulation, to form wet web; (b) wet web is dewatered to about 10% to about 30% denseness; (c) wet web is sent to second webbing of circulation; (d) wet web is clipped between second webbing and the supports fabrics band, use non-extruding dewater unit that wet web is dewatered to denseness greater than about 30%, wherein this device because and wet web form integral sealing, pass this wet web so be suitable for making the pressure fluid of about 5 pounds/square inch or bigger pressure to flow basically; (e) the wet web transmission is turned back to second webbing; (f) wet web that will take off water is pressed against on the surface of heated drying cylinder, thus dry at least in part wet web; (g) make the wet web that took off water be dried to final drying.

On the other hand, the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre on first webbing of circulation, to form wet web; (b) wet web is sent to second webbing of circulation; (c) wet web is clipped between second webbing and the supports fabrics band, and wet web is dewatered to about 30% denseness; (d) use pneumatic shuttle further wet web to be dewatered to greater than about denseness of 30% to 40%, owing between gas boosting chamber and gathering-device, form integral sealing,, this pneumatic shuttle passes this wet web so being suitable for making the pressure fluid of about 5 pounds/square inch or bigger pressure to flow basically; (e) the wet web transmission is turned back to second webbing, so that the paper cornerite of wet web on pressure roller is less than 90 °; (f) wet web that will take off water is pressed against on the surface of heated drying cylinder, thus dry at least in part high wet web; (g) make the wet web that took off water be dried to final drying.

On the other hand, the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre on first webbing of circulation, to form wet web; (b) wet web is dewatered to about 10% to about 30% denseness; (c) wet web is sent to another webbing; (d) wet web is clipped between second webbing and the supports fabrics band, two kinds of one of them utilizations of webbing were used in the operating space of bottom woollen blanket and the parts of flax squeezing wet press (tow press wet pressmachine) originally; (e) use pneumatic shuttle further wet web to be dewatered to greater than about denseness of 30% to 40%, owing between gas boosting chamber and gathering-device, form integral sealing,, this pneumatic shuttle passes this wet web so being suitable for making the pressure fluid of about 5 pounds/square inch or bigger pressure to flow basically; (f) the wet web transmission is turned back to second webbing; (f) wet web that will take off water is pressed against on the surface of heated drying cylinder, thus dry at least in part this wet web; (g) make this paper web be dried to final drying.

On the other hand, the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre on first webbing of circulation, makes wet web (wet web) to form wet web (wet web); (b) wet web is sent to second webbing of circulation; (c) wet web is clipped between second webbing and the supports fabrics band, and wet web is dewatered to about 10% to about 30% denseness; (d) use pneumatic shuttle further wet web to be dewatered to greater than about denseness of 30% to 40%, owing to form integral sealing between gas boosting chamber and gathering-device, this pneumatic shuttle is suitable for making mobile basically this wet web that passes of pressure fluid of about 5 pounds of/square inch pressure; (e) wet web transmitted turn back to second webbing, thus make this paper web have about 8 cubic centimetres/gram or bigger bulk density; (f) wet web that will take off water with webbing is pressed against on the surface of heated drying cylinder, with keep about 8 cubic centimetres/gram or bigger bulk density; (g) make this wet web be dried to final drying.

On the other hand, the present invention relates to make the method for cellulosic fabric, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre on first webbing of circulation, to form wet web; (b) wet web is sent to second webbing of circulation; (c) wet web is clipped between second webbing and the supports fabrics band; (d) make second webbing and supports fabrics band with being clipped in therebetween wet web by between pneumatic shuttle and the gathering-device, and second webbing is between wet web and gathering-device, this pneumatic shuttle and gathering-device operatively associate, and be suitable for producing about 30 inches of mercury of crossing wet web or the more pressure reduction of high pressure and about per square inch 10 standard cubic foots of per minute or the bigger flow of pressurized fluid of passing wet web; (e) utilize this flow of pressurized fluid to make the dehydration of this wet web to about 30% or higher denseness; (e) wet web is pressed against on the dryer surface of heating by second webbing; (f) make this paper web be dried to final drying.

Therefore, another embodiment of the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre between second webbing of first webbing of circulation and circulation to form wet web, and wherein wet web is clipped between first webbing and second webbing; (b) use non-extruding dewater unit that wet web is dewatered to about 30% or bigger denseness, because this non-extruding dewater unit and wet web form integral sealing, so it is suitable for making mobile basically this wet web that passes of pressure fluid of about 5 pounds/square inch or bigger pressure; (c) wet web that will take off water is pressed against on the surface of heated drying cylinder, thus the dry at least in part wet web that took off water; (d) make the wet web that took off water be dried to final drying.

On the other hand, the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre between second webbing of first webbing of circulation and circulation to form wet web, and wherein wet web is clipped between first webbing and second webbing;

(b) wet web is dewatered to about 10% to about 30% denseness; (c) use pneumatic shuttle that wet web is dewatered to greater than about denseness of 30% to 40% additionally, owing between gas boosting chamber and gathering-device, form integral sealing, pass this wet web so this pneumatic shuttle is suitable for making the pressure fluid of about 5 pounds/square inch or bigger pressure to flow basically, thus make this paper web have about 8 cubic centimetres/gram or bigger bulk density; (d) wet web that will take off water by webbing is pressed against on the surface of heated drying cylinder, with keep about 8 cubic centimetres/gram or bigger bulk density; (e) make the wet web that took off water be dried to final drying.

On the other hand, the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre between second webbing of first webbing of circulation and circulation to form wet web, and wherein wet web is clipped between first webbing and second webbing; (b) make the wet web that is clipped between first webbing and second webbing by between pneumatic shuttle and the gathering-device, and second webbing is between wet web and gathering-device, this pneumatic shuttle and gathering-device operatively associate, and be suitable for producing about 30 inches of mercury of crossing wet web or the more pressure reduction of high pressure and about per square inch 10 standard cubic foots of per minute or the bigger flow of pressurized fluid of passing wet web; (c) use flow of pressurized fluid to make this wet web be dewatered to about 30% or higher denseness; (d) wet web is pressed against on the dryer surface of heating by second webbing; (e) make the paper web of this dehydration be dried to final drying.

On the other hand, what the present invention relates to a kind of traditional crescent former with at least one woollen blanket and squeeze dehydration unit makes improving one's methods of paper napkin machine, and this method comprises: (a) replace at least one woollen blanket with at least one webbing; (b) replace squeeze dehydration unit with extruding dewater unit non-heat, non-.Crescent forming technology and the equipment described in the United States Patent (USP) 3,224,928 of the Lee that announces in December 21 nineteen sixty-five etc., at this by with reference to incorporated.

On the other hand, the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre between second webbing of first webbing of circulation and circulation to form wet web; (b) use combination, wet web is dewatered to about 10% or bigger denseness around the centrifugal force and the webbing tension force of forming rolls; (c) adopt non-extruding dewater unit, because this non-extruding dewater unit forms integral sealing with wet web, so it is fit to make pressure fluid mobile through paper web basically with about 5 pounds/square inch or bigger pressure reduction; (d) the wet web transmission is returned or remained on second webbing; (e) paper web that took off water is pressed against on the dryer surface of heating, so that to dry this wet web of small part; (f) make wet web be dried to final drying.

On the other hand, the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre between second webbing of first webbing of circulation and circulation to form wet web; (b) use combination, wet web is dewatered to about 10% or bigger denseness around the centrifugal force and the webbing tension force of forming rolls; (c) further wet web is dewatered to 10% to about 30% denseness; (d) use pneumatic shuttle that wet web is replenished and be dewatered to about 30% to about 40% denseness, owing to form whole sealing between gas boosting chamber and gathering-device, so this pneumatic shuttle is fit to make pressure fluid to see through wet web basically with about 5 pounds/square inch or bigger pressure to flow; (e) the wet web transmission is returned or remained on second webbing; (f) paper web that took off water is pressed against on the dryer surface of heating, so that to dry this wet web of small part; (g) make wet web be dried to final drying.

On the other hand, the present invention relates to a kind of method of making the cellulose paper web, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre between second webbing of first webbing of circulation and circulation to form wet web; (b) wet web is dewatered to about 10% to about 30% denseness; (c) use pneumatic shuttle that paper web is replenished and be dewatered to about 30% to about 40% denseness, owing to form whole sealing between gas boosting chamber and gathering-device, so this pneumatic shuttle is fit to make pressure fluid to see through wet web basically with about 5 pounds/square inch or bigger pressure to flow; (d) wet web is transmitted return or remain on second webbing, thus make this wet web have about 8 cubic centimetres/gram or bigger bulk density; (e) wet web that will take off water by webbing is pressed against on the surface of heated drying cylinder, with keep about 8 cubic centimetres/gram or bigger bulk density; (f) make wet web be dried to final drying.

Another aspect, the present invention relates to make the method for cellulosic fabric, this method comprises the steps: that (a) is deposited on the water slurry of paper fibre between second webbing of first webbing of circulation and circulation to form wet web, and wherein the webbing of at least one circulation is three-dimensional molded webbing; (b) first webbing and second webbing are passed through between air pressure pumping chamber (airplenum) and gathering-device with the wet web that is clipped in therebetween, and molded webbing that should three-dimensional is between wet web and gathering-device, this air pressure pumping chamber and gathering-device operatively associate, and be suitable for producing about 30 inches of mercury of crossing wet web or the more pressure reduction of high pressure and about per square inch 10 standard cubic foots of per minute or the bigger flow of pressurized fluid of passing wet web; (d) use this flow of pressurized fluid that wet web is dewatered to about 30% or bigger denseness; (e) wet web that will take off water by webbing is pressed against on the surface of heated drying cylinder; (f) make this wet web be dried to final drying.

Here employed term " first webbing " is meant: any webbing in the manufacturing paper handkerchief process that be known in the art or as described herein, it includes, but not limited to be used in shaping, molded and other supports fabrics bands in the paper handkerchief manufacturing.Yet first webbing is the forming fabric band preferably.Term " second webbing " is meant as used herein: any webbing in the manufacturing paper handkerchief process that be known in the art or as described herein, it includes, but not limited to be used in shaping, molded and other supports fabrics bands in the paper handkerchief manufacturing.Yet, second webbing molded webbing preferably as described herein.At this second webbing is molded webbing, and the paper web that the result obtains is molded paper web.Here employed term " supports fabrics band " is meant: any webbing in the manufacturing paper handkerchief process that be known in the art or as described herein, it includes, but not limited to be used in shaping, molded and other supports fabrics bands in the paper handkerchief manufacturing.

The finger of employed here term " integral sealing " and " integral sealing is crossed ": the relation between gas boosting chamber and wet web, gas boosting chamber and fabric operatively associate and mediate contact, therefore, when the gas boosting chamber exists on the paper web two sides when working under about 30 inches of mercury or the bigger pressure reduction, in the air of supply gas pumping chamber about 85% or more air see through paper web and flow; And the relation between gas boosting chamber and gathering-device, gas boosting chamber and paper web and gathering-device operatively associate and mediate contact, therefore, when gas boosting chamber and gathering-device exist on the paper web two sides when working under about 30 inches of mercury or the bigger pressure reduction, in the air of supply gas pumping chamber about 85% or more air see through paper web and flow in the gathering-device.

Mainly be that therefore, pneumatic shuttle can make wet web be dewatered to very high denseness owing to the air-flow that sees through paper web that has produced very high pressure reduction on the paper web two sides and formed thus.For example, in specific embodiment, pneumatic shuttle can make the denseness of paper web increase about 3% or bigger, and particularly about 5% or bigger, 5% to about 20%, more especially about 7% or bigger according to appointment, and more particularly still about 7% or bigger, for example from about 7% to 20%.Like this, the denseness of leaving the wet web of pneumatic shuttle can be about 25% or bigger, about 26% or bigger, about 27% or bigger, about 28% or bigger, about 29% or bigger, and preferably about 30% or bigger, particularly about 31% or bigger, more especially about 32% or bigger, as from about 32% to about 42%, particularly about 33% or bigger, even more especially about 34% or bigger, as from about 34% to about 42%, also have more especially about 35% or bigger.

By making this method increase the dehydration of the pneumatic shuttle of integral sealing, can obtain to surpass the remarkable improvement of aforementioned existing method.At first and the most important thing is, can obtain sufficiently high denseness, like this, this method can be with industrial operating speed operation.Here employed " high speed operation " or " industrial operating speed " of making paper napkin machine refer to the feet per minute clock be unit at least with following value or scope in any one identical machine speed: 1,000; 1,500; 2,000; 2,500; 3,000; 3,500; 4,000; 4,500; 5,000; 5,500; 6,000; 6,500; 7,000; 8,000; 9,000; 10,000 and be a scope of upper and lower bound with above-mentioned arbitrary value.And, significantly improve paper at high-consistency lower mould paper and kept the ability of its three-dimensional, and also significantly improved the final thickness of paper like this.As used herein, be used for webbing, woollen blanket or not the term on the surface of calendering paper web " textured " or " three-dimensional " be meant: the rough basically or coplane not in this surface.In addition, this machine construction is applicable to transfer step rapidly, and with respect to existing wetpressing, this step causes the remarkable increase of bulk density and absorbability once more.

Before pneumatic shuttle, can use selectable steam jet ejector or analog, to increase horizontal (cross-machine direction) humidity outline line of back pneumatic shuttle denseness and/or improvement paper web.And, when machine speed is longer than the holdup time slow and in pneumatic shuttle, can obtain higher denseness.

The pressure reduction on the wet web two sides that is provided by pneumatic shuttle can be 25 inches of mercury or higher, for example from about 25 to about 120 inches of mercury, particularly about 35 inches of mercury or higher, for example from about 35 to about 60 inches of mercury, and more especially from about 40 to about 50 inch of mercury height.Gas boosting chamber by pneumatic shuttle keeps greater than 0 to about 60 pounds/square inch (psig) fluid pressure of wet web one side, particularly greater than 0 to about 30psig, more especially about 5psig or bigger, for example about 5 to about 30psig, and more especially from about 5 to about 20psig, thereby can partly obtain above-mentioned pressure reduction.The gathering-device of pneumatic shuttle is preferably as vacuum tank, this vacuum tank 0 to about 29 inch of mercury vacuum, particularly 0 to about 25 inch of mercury vacuum, particularly greater than 0 to about 25 inch of mercury vacuum, and more especially, work under for example about 15 inch of mercury vacuum from about 10 to about 20 inch of mercury vacuum.In some cases, the gathering-device of pneumatic shuttle can be worked under 30 inch of mercury vacuum or higher vacuum.Gathering-device preferably but be not must form integral sealing with the gas boosting chamber and be evacuated so that it is as the gathering-device of air and liquid.Stress level in gas boosting chamber and gathering-device is felt better and monitor and can be controlled to predeterminated level most.

Obviously, pressure fluid that uses in pneumatic shuttle and outside air sealing separate, and to produce the air-flow that passes paper web basically, this air-flow causes the huge water separation capability of pneumatic shuttle.Through the flow of pressurized fluid of pneumatic shuttle suitably the open area per square inch from about 5 to about 500 scfm (SCFM), about per square inch 10SCFM of open area or bigger particularly, for example from the open area about per square inch 10 to about 200SCFM, about per square inch 40SCFM of open area or bigger more particularly, for example from the open area about per square inch 40 to about 120SCFM.It is desirable to, in the pressure fluid of supply gas pumping chamber, 70% or bigger, particularly 80% or bigger, more particularly 90% or bigger pressure fluid be extracted in the vacuum tank through wet web.For the object of the invention, term " scfm " refers to: 14.7 pounds/square inch absolute values and 60 degree Fahrenheit temperature (°F) under the cubic foot per minute number that records.

Here the term that is used interchangeably " air " and " pressure fluid " refer to: be used in any gaseous matter that makes the wet web dehydration in the pneumatic shuttle.Gaseous matter comprises air, steam or analog suitably.Best, pressure fluid comprises the air with ambient temperature, and perhaps heated air, this heated air are that only the method by pressurization raises the temperature to about 300 °F or littler, particularly about 150 or less gas.

Wet web preferably is attached to the surface of raising basic drier or other heated drying cylinder (heateddrying cylinder) as follows, that is: keep particularly passing through the molded texture that forms on the three dimensional fabric band owing to anticipate the essential part of the texture of formation.Being used for the conventional method that the production wet pressing plays crepe paper is not suitable for this purpose, because in this conventional method, pressure roller is used for making the paper web dehydration, and paper web is evenly squeezed fine and close and smooth state.For the purpose of the present invention, traditional essentially smooth press felt by the band texture material such as porose webbing and preferably through-air-drying fabric bring replacement.For another aspect of the present invention, traditional essentially smooth press felt that traditional crescent former is made paper napkin machine by the material of band texture such as porose webbing and preferably through-air-drying fabric bring replacement.The paper handkerchief paper web that the method according to this invention is made on the three dimensional fabric band molded after, preferably has about 8 cubic centimetres/gram (cc/g) or bigger, particularly about 10cc/g or bigger, and more especially about 12cc/g or bigger bulk density, and use after the fabric guipure have texture is pressed onto it on heated drying cylinder, keep this bulk density.

Best result is, compares with traditional paper handkerchief manufacture method, can use the squeeze pressure that significantly reduces.Best, when crossing fifty-fifty when surrounding maximum pressure point any 1 square inch regional, the peak load zone that is applied on the paper web should be about 400psi or littler, particularly about 350psi or littler, more especially about 150psi or littler, for example about 2 and about 50psi between, and the most about 30psi or littler.The maximum pressure point measurement be that the squeeze pressure of unit is preferably about 400pli or still less with pound/linear inch (pli), and particularly about 350pl or still less.With low pressure three-dimensional paper web structure is applied to and helps in dry-web to keep basic density uniformly on the heated drying cylinder.With raise before basic drier is connected, by using non-extruding device that paper web is dewatered effectively, and pass through to select porose webbing so that paper web contacts against drying machine, this will help paper web to obtain basic density uniformly, and this drying machine can not apply high, the rigidity ledge of high local pressure comparatively speaking to paper web.Webbing is preferably handled through the webbing antitack agent of effective dose, so that impel paper web to separate with webbing when in a single day paper web conflicts the drying machine surface.

The absorbability of paper handkerchief can be characterized by its absorbability and its absorption rate.As used herein, " absorbability " is the maximum of the absorbable distilled water of paper, is expressed as the gram number/sample paper gram of water.More particularly, the absorbability of sample paper can multiply by sample 4 inches (101.6 take advantage of 101.6mm), that weight is accurate to the dry paper of (nearest) 0.01 gram and measures with cutting into 4 inches.This sample drops to and is on the wet distilled water flume surface in chamber, and stops 3 minutes in groove.Use pliers or tweezers to take sample away then, and with trident clip vertical hanging it to drain redundant moisture.Each sample can draining 3 minutes.Then by weighing pan is placed under the sample, and unclamp three jaws, thereby sample is placed on the weighing pan.Wet sample weight is accurate to (nearest) 0.01 gram.Absorbability is that the sample wet weight deducts dry weight (water yield that is absorbed), and the dry weight divided by sample obtains again.Can measure at least 5 representative samples of every kind of product and ask its result's mean value.

" absorption rate " is: product is the drenched fully time that is spent in distilled water.Determining this absorption rate, this paper washer is 2.5 inches and multiply by 2.5 inches (63.5 multiply by 63.5mm) paper and form through measuring every by 20 on the water surface of the distillation tank by paper washer being dropped to have 30 ℃ of temperature.The moment of running into water in second from sample is an absorption rate up to the time that its drenched fully (being determined by vision) is experienced.

This method is applicable to makes various absorption products, comprises face-cloth, bathes with paper handkerchief, towel, napkin or wiping cloth or similar products.According to purpose of the present invention, term " paper handkerchief " or " tissue products " are commonly used to describe the structure of this product, and term " cellulose paper web " is used for making a general reference the paper web that comprises or be made of cellulose fibre under the situation of not considering the finished product structure.

The present invention can adopt many fiber types, comprises hardwood or cork, straw (straw), fiber crops, milkweed (milkweed) seed suede fiber, abaca (abaca), hemp (hemp), kenaf (kenaf), bagasse (bagasse), cotton, reed or similar material.Can use all known paper fibres to comprise bleaching or unbleached fiber, the fiber of natural formation (comprises xylon and other cellulose fibre, cellulose derivative and chemical method sclerosis or cross filament), or synthetic fiber (synthesize paper fibre and comprise polypropylene, acrylic acid (acrylic), aromatic polyamides (aramids), the fiber of some form that acetate (acetates) and analog are made), original and regeneration or recycled fiber, hardwood and cork, make paper pulp (as ground wood pulp (groundwood)) with mechanical means, make paper pulp (including but are not limited to brown paper (kraft) slurry method for making and sulphite slurrying dregs of rice method) with chemical method, make paper pulp with thermomechanical method, make the fiber that paper pulp or similar approach are made paper pulp with the chemi thermo mechanical method.Can use the mixing of any subclass of the fiber of above-mentioned or related specy.The favorable method preparation that fiber can multiplely be known in the art.The process useful of preparation fiber comprises and disperses to make its bending and improve its drying property, the United States Patent (USP) 5,348 that it was announced in for example on September 20th, 1994, the United States Patent (USP) of announcing with on March 26th, 1996 in 620 5, open in 501,768, these two patents all are people such as M.A.Hermans.

Also can use chemical addition agent, and this chemical addition agent can be added in pristine fibre, the fibre mass suspension, or at production period or add on the paper web afterwards.This additive comprises opacifying agent (opacifiers), pigment (pigments), wet strength agent (wet strength agents), dry strength agent (dry strength agents), softening agent (softeners), lubricant (emollients), humectant (humectants), virucide (viricides), bactericide (bactericides), buffer (buffers), wax (waxes), house fluoropolymer (fluoropolymers), odour controlling materials (odor control materials) and deodorant (deodorants), zeolite (zeolites), dyestuff (dyes), fluorescent dye (fluorescent dyes) or bleaching agent (whiteners), spices (perfumes), release agent (debonders), plant and mineral oil, humectant, adhesive (sizingagents), hypersorption agent (superabsorbents), surfactant (surfactants), water-repellent agent (moisturizers), ultraviolet ray retarding agent (UV blockers), antibiotic agent (antibioticagents), washing agent (lotions), fungicide (fungicides), preservative agent (preservatives), aloe extract (aloe-vera extract), vitamin e or similar additive.Chemical addition agent needn't evenly add, but can change to opposite side at diverse location with from a side of paper handkerchief.Be deposited on the performance that hydrophobic material (hydrophobic material) on the paper web part surface can be used to strengthen paper web.

Head box (headbox) can layering, produces sandwich construction thereby can be in the sheet forming process be sprayed by single stream vanning.In specific embodiment, paper web is made by the head box of layering or stratification so that improve flexibility at the preferential deposit staple fibre of a side of paper web, then the opposite side of paper web or for three layers or more multi-layered paper web at the long fiber of internal layer deposit.Paper web is preferably on the circulation loop of porose forming fabric band and is shaped, and allows fluid to discharge and the paper web partial dehydration on this loop.

Can know from the following description and see many characteristics of the present invention and advantage.In the following description, with reference to description of drawings the preferred embodiments of the present invention.These embodiment do not represent four corner of the present invention.Therefore, the claims here are considered to express whole protection domain of the present invention.

Description of drawings

Fig. 1 represents the process flow diagram according to the method for the cellulose paper web that is used to make high bulk density and high absorbent capacity of the present invention typically.

Fig. 2 represents the process flow diagram according to another kind of method of the present invention typically.

Fig. 3 represents to be used for the amplification end view of the pneumatic shuttle in the method for Fig. 1-2 typically, and the gas boosting chamber sealing device of pneumatic shuttle is positioned at raised position with respect to warm fabric and vacuum tank.

Fig. 4 is the side view of the pneumatic shuttle of presentation graphs 3 typically.

Fig. 5 represents usually the profile of the amplification of cutting open of 6-6 line in Fig. 3 typically, loads but the sealing device among the figure heads on webbing.

Fig. 6 represent typically usually in Fig. 3 the 7-7 line cut open with the similar amplification profile of Fig. 5.

Fig. 7 represents to be arranged to against the perspective view of several parts of the gas boosting chamber sealing device of webbing typically, and for purpose of explanation, part is cut open and represented with the cross section.

Fig. 8 represents to be used for the amplification profile of another kind of hermetically-sealed construction of the pneumatic shuttle of Fig. 3 typically.

Fig. 9 is the enlarged diagram of the hermetic unit of the pneumatic shuttle of presentation graphs 3 typically.

Figure 10 represents the process flow diagram according to the method for the cellulose paper web that is used to make high bulk density and high absorbent capacity of the present invention typically.

Figure 11 represents the process flow diagram according to another kind of method of the present invention typically.

Figure 12 represents typically according to the another kind of process flow diagram of replacing implementation method of the present invention.

The specific embodiment

With reference now to attached enclosing, describe the present invention in detail, wherein in different accompanying drawings to identical

Element is adopted and is denoted by like references.For the sake of simplicity, schematically shown the different tensioning rods that are used for limiting several webbing running routes, but do not given numbering.Transmit, crease and to use different traditional paper making equipment and operation for feedstock production, head box, forming fabric band, paper web with dry.However, can represent concrete legacy device among the figure for the background introduction of various embodiments of the present invention use in order to provide.

Can implement method of the present invention on device shown in Figure 1, this device is obtained by the transformation of typical wet pressing papermaking towel machine.The elementary wet web (embryonic wet web) 10 that forms the paper fibre slurries is deposited on the circulation loop of first webbing 14 from head box (headbox) 12.Notice that form of implementation also may be used such as the such building mortion of two net forming machines as an alternative, and does not change the function of this transformation.The denseness of slurries and flow velocity have determined the basic weight (basic weight) of dried paper web, this basic weight be preferably about 5 and about 80 the gram/square metre (gsm) between, be more preferably about 8 and about 40gsm between.

When elementary wet web 10 carried on first webbing 14, the natural drainage by usually relevant with first webbing 14 and forming rolls 52 made this elementary wet web 10 partial dehydrations.Can carry out additional dehydration by any dewater unit or equipment such as vacuum tank 46 and so on.In case finish the partial dehydration step, by using or not using vacuum slide rail (vacuum shoe) 50 and wet web 10 is sent to or remains on second webbing 24.One of them can be the forming fabric band at least in the webbing 14 and 24, preferably first webbing 14.In addition, one of them can be molded webbing at least in the webbing 14 and 24, preferably second webbing 24.

The present invention runs up in order to realize, the traditional paper handkerchief dewatering before the drying cylinder 30 of heating may not fully be removed moisture, so just needs the additional dehydration device.As the scheme that can select, use vacuum tank 47 to dewater further to wet web.In the illustrated embodiment, pneumatic shuttle 16 is used for making paper web 10 non-extruding dehydrations.Shown in pneumatic shuttle 16 comprise: be arranged in forced air gas boosting chamber 18 device on the wet web 10; Be expressed as the water and the fluid collection device 20 of vacuum tank form, this gathering-device is arranged in below the supports fabrics band 14, and with the gas boosting chamber 18 and second webbing, 24 operatively associates of forced air.(in other alternative embodiment, fluid collection device 20 can be provided with second webbing, 24 adjacency, keep operatively associates with the gas boosting chamber 18 of forced air and supports fabrics band 22).When passing pneumatic shuttle 16, wet web 10 is sandwiched between second webbing 24 and the supporting fabrics band 22, so that hermetically against wet web 10, and can not damage wet web 10.

The basic rate that pneumatic shuttle 16 provides moisture to break away from can make paper web obtain exceeding 30% degree of drying before on being attached to as the drying cylinder 30 of raising basic drier and so on, does not preferably need basic extrusion dehydration.Several embodiment of pneumatic shuttle 16 can be described below in more detail.It is 08/647 that other suitable embodiment is disclosed in Application No., in 508 the document, this patent document is that people such as M.A.Hermans applied on May 14th, 1996, and name is called " making the method and apparatus in the soft paper ", and this patent documentation is incorporated as a reference at this.

After pneumatic shuttle 16, transmit under the help of slide rail 26 or do not have under it helps passing on the vacuum at station place, wet web 10 further is clipped between second webbing 24 and the supports fabrics band 22 operation, is transmitted up to wet web 10 and returns arrival preferably with second webbing 24 of texture fabric band.

Second webbing 24 can comprise three-dimensional through-air-drying fabric band, for example, this through-air-drying fabric band is at the people's such as K.F.Chiu of announcement on July 4 nineteen ninety-five United States Patent (USP) 5,429, open in 686, as the reference combination, perhaps second webbing 24 can comprise fabric or bondedfibre fabric band other weaving, the band texture to this patent at this.Second webbing 24 can with the webbing antitack agent for example the mixture of silicon or hydrocarbon handle so that wet web 10 is separated with second webbing 24.The webbing antitack agent can be sprayed on second webbing 24 before grasping paper web.In case be arranged on second webbing 24, although during grasping, transmitting slide rail 26 places at least because vacuum power carries out molded, can molded fully wet web 10, but wet web 10 can also lean against on second webbing 24 by further molded by utilizing vacuum pressure or light pressure (not shown).

Then, be pressed against on the drying cylinder 30 of heating by pressure roller 32 at the wet web 10 on second webbing 24.The drying cylinder 30 of heating is equipped with vapour hood or raises basic drier cover 34.This cover 34 utilizes usually and is in about 300 °F or higher, particularly about 400 °F or higher, more especially about 500 °F or higher, and the jet that adds hot-air under the most about 700 or the higher temperature, jet direction is crossed flow device from nozzle or other and is directly pointed to wet web 10, like this, in hood 34, gas jet has the maximal rate or the part average speed of one of following level: about 10 meter per seconds (m/s) or bigger, about 50m/s or bigger, about 100m/s or bigger, about 250m/s or bigger.

Wet web has about 30% or bigger fiber consistency suitably when being attached on the heated drying cylinder 30, is in particular about 35% or bigger, for example between about 35% and about 50%, and is more preferably about 38% or bigger fiber consistency.When heated drying cylinder 30 is removed, the aridity of wet web 10 is increased to about 60% or bigger, and particularly about 70% or bigger, more especially about 80% or bigger, more specifically 90% or bigger, most particularly between about 90% and about 98%.But part dry wet paper web on heated drying cylinder 30, and about 40% to about 80% denseness wet creasing, dry then (back is dry) is to about 95% or bigger denseness.Can use unconventional cover and impact system as substitute or the additives of raising basic drier cover 34, to strengthen the aridity of wet web.Additional heated drying cylinder 30 or other drying equipment are non-extruding drying machine especially, can use after first heated drying cylinder 30.Suitable back drying equipment comprises one or more heated drying cylinders 30, as raises basic drier and slack tank drying machine, impingement drying machine or any other commercial efficient drying equipment.Form of implementation as an alternative, if second webbing 24 is molded fabrics, can be so molded wet web 10 can be on heated drying cylinder 30 bone dry and dry creped.Aridity on heated drying cylinder 30 depends on these factors, as the speed of wet web 10, the size of heated drying cylinder 30, the amount of wetness of wet web 10 etc.

The dry fabric 36 that is produced is for example pulled out or is spread out of from heated drying cylinder by creping blade 28, and it is wound on the roller 38 then.Illustrated Interface Control mixture 40, is ejected into from spray line 42 with Sprayable on the surface of heated drying cylinder 30 of rotation with before heated cylinder surfaces contacts at wet web 10.As the heated drying cylinder 30 lip-deep alternative that are sprayed directly on rotation, Interface Control mixture 40 can be applied directly on wet web 10 or the heated cylinder surfaces 30 by photogravure (gravure print), perhaps can be incorporated in the aqueous fibre mass suspension in the green end of paper machine.When being positioned at heated drying cylinder 30 surfaces, the also available chemical method of wet web 10 is handled, and for example by printing on dry-web 10 or direct spray solution, comprises and adds solvent to impel from the separation on heated drying cylinder 30 surfaces.

Interface Control mixture 40 can comprise traditional drying machine antitack agent that creases adhesive and/or be used for wet pressing and crease and operate.Also can use following such Interface Control mixture to remove wet web 10 from heated drying cylinder 30 surfaces, and do not crease, that such mixture is applied on the same day in people such as F.G.Druecke and the application, application number is unknown and name is called in the U.S. Patent application of " method (Method ofproducing low density resilient webs) of producing the low density resilient webs width of cloth " openly, provide as a reference at this.

Fig. 2 has represented another alternative embodiment, and except these following differences, it is similar to Fig. 1.The operation roller 55 of supports fabrics band 22 is positioned to change the direction of second webbing 24, supports fabrics band 22 and wet web 10, so that wet web 10 be sent to raise basic drier or other heated drying cylinders 30 before, it seldom may separate with suction press roll 32.Roller 55 has reduced not support the paper wrap angle sigma, thereby will its chance of separating with second webbing 24 be reduced to minimum before wet web 10 is sent to heated drying cylinder 30.The elementary wet web 10 that forms the paper fibre slurry is deposited on the circulation loop of first webbing 14 from head box 12.One of them can be the forming fabric band at least in the webbing 14 and 24, preferably first webbing 14.In addition, one of them can be molded webbing at least in the webbing 14 and 24, preferably second webbing 24.

When elementary wet web 10 carries, make its partial dehydration by usually relevant natural drainage with first webbing 14 and forming rolls 52 on first webbing 14.On first webbing 14, in the carrying, can carry out further to wet web 10 dehydrations by selectable vacuum tank 46 or other suitable dehydration equipments.In case finish the partial dehydration step, by using or not using vacuum slide rail 50 and wet web 10 is sent on second webbing 24.Wet web 10 is clipped between second webbing 24 and the supports fabrics band 22, and selectively, when it is clipped between second webbing 24 and the supports fabrics band 22, comes further by vacuum tank 47 or other suitable dehydration papermaking and to dewater.

When wet web 10 was clipped between second webbing 24 and the supports fabrics band 22, pneumatic shuttle 16 was used for making paper web 10 non-extruding dehydrations.Shown in pneumatic shuttle 16 comprise: the device that is arranged to operationally the forced air gas boosting chamber 18 that interrelates with vacuum tank 20.When it passed through pneumatic shuttle 16, wet web 10 was clipped between second webbing 24 and the supports fabrics band 22, and supports fabrics band 22 is between wet web 10 and vacuum tank 20.(in other alternative embodiment, second webbing 24 can be arranged between wet web 10 and the vacuum tank 20).

Then, under the help of vacuum slide rail 26 or do not have under the situation of its help, wet web 10 is further transmitted turns back to second webbing 24.Afterwards, the wet web 10 on second webbing 24 by pressure roller 32 preferably so that the mode that does not support paper wrap angle sigma angle minimum on the pressure roller 32 be pressed against on the drying cylinder 30.Do not support the paper wrap angle sigma angular range can from 0 to about 90 the degree, from 0 to about 45 the degree, and from 0 to about 10 the degree.In addition, less do not support the size that the paper wrap angle sigma has reduced the region of no pressure that needs, reduced in pressure roller, producing the required energy of vacuum thus.When wet web 10 is sent on the drying cylinder 30, be not defined as the circumferential section (the expenditure numerical table shows) that pressure roller 32 is twined by wet web 10 with supporting the paper wrap angle sigma, this part from wet web 10 at the first make contact on the pressure roller 32 to the last contact point of wet web 10 on pressure roller 32.

Heated drying cylinder 30 is equipped with vapour hood or raises basic drier cover 34.The dry-web 36 that the result obtains is drawn out or spreads out of from drying cylinder 30, and does not remove with not creasing, is wound up into afterwards on the roller 38.The angle of the dry-web 36 of pulling out from the surface of heated drying cylinder 30 is 0 to spend about 100 degree suitably, and measures along the tangent line on heated drying cylinder 30 surfaces at burble point, although it can be according to different running speeds and different.

Interface Control mixture 40 is sprayed onto from spray line 42 with Sprayable on the surface of heated drying cylinder 30 of rotation.For example, Interface Control mixture 40 can comprise polyvinyl alcohol, the mixture of D-sorbite (sorbitol) and He Gelisi (Hercules) M1336 polyglycols, this mixture adding has in the aqueous solution that is less than 5% solid, the dosage between 50 and 75 milligrams/square metre by weight percentage.The consumption that adheres to compound and antitack agent must be balanced adhering to wet web 10, thereby it can not rise and enters in the cover and allow the paper web 36 of drying is pulled out and do not creased from drying cylinder 30.

Fig. 3-6 expression is used for making the pneumatic shuttle 200 of wet web 10 dehydrations.Pneumatic shuttle 200 generally includes a upper gas pumping chamber 202, and it combines with the bottom gathering-device 204 with vacuum tank form.When wet web 10 is clipped in when moving between upper support webbing 206 and the lower support webbing 208, this wet web 10 between gas boosting chamber 202 and vacuum tank 204 longitudinally (macbine direction) 205 move.Gas boosting chamber 202 and vacuum tank 204 operationally are coupled to each other, and the pressure fluid of supply gas pumping chamber 202 passes wet web 10 and advances like this, and remove or discharge through vacuum tank 204.

Each continuous webbing 206 and 208 advances on a series of roller (not shown)s, so that guide, drive and strain webbing 206 and 208 in mode as known in the art.The stretching of webbing is set to predetermined value, and is suitable for about 10 to about 60 pounds/linear inch (pli), particularly from about 30 to about 50pli, and preferably from about 35 to about 45p11.The webbing that can be used for transmitting through pneumatic shuttle 200 wet webs 10 comprises the almost webbing of any fluid penetrable, Albany International94M for example, APPleton Mills2164B or analog.

Fig. 3 represents the end-view across the pneumatic shuttle 200 of the width of wet web 10, and Fig. 4 represents longitudinally the inverted view of 205 pneumatic shuttle.In this two width of cloth Fig. 3 and Fig. 4, several parts of gas boosting chamber 202 are illustrated in the position of rising or bouncing back with respect to wet web 10 and vacuum tank 204.At advanced position, pressure fluid can not effectively seal.For the purposes of the present invention, " advanced position " of pneumatic shuttle 200 means that the parts of gas boosting chamber 202 do not collide wet web 10 and supporting fabrics band 206 and 208.

Illustrated gas boosting chamber 202 and vacuum tank 204 are installed in the suitable frame structure 210.Shown in frame structure 210 comprise by a plurality of vertically towards the upper and lower supporting plate 211 that separates of support strip 212.Gas boosting chamber 202 defines a booster cavity 214 (Fig. 6) that is fit to admit pressure fluid, and this pressure fluid passes the one or more suitable air hose 215 that is operably connected with the source of pressurised fluid (not shown) and supplies with.Correspondingly, vacuum tank 204 defines a plurality of vacuum chambers (describing below in conjunction with Fig. 6), and this vacuum chamber preferably is operably connected with low and deep vacuum source (not shown) by suitable fluid conduit systems 217 and 218 (Fig. 4,5 and 6) respectively.Then, the moisture of removing from wet web 10 separates from air-flow.The various securing members of parts that are used for installing pneumatic shuttle 200 are at Fig. 4, express in 5 and 6, but label not.

The amplification profile of Fig. 5 and 6 expression pneumatic shuttles 200.In these Fig. 5 and 6, shown in pneumatic shuttle 200 be in the operating position, wherein the parts of gas boosting chamber 202 are reduced to the relations that keep with wet web 10 and supporting fabrics band 206 and 208 bumps.Therefore the degree that has been found that bump causes pressure fluid with minimum contact force appropriate seal, and reduces hereinafter the webbing wearing and tearing (reduced) with more detailed description.

Gas boosting chamber 202 comprises stationary parts 220 and sealing device 260, and this stationary parts is fixedly installed on the frame structure 210, and the sealing device is installed movably with respect to frame structure 210 and wet web 10.Form of implementation as an alternative, whole gas boosting chamber 202 can be installed movably with respect to frame structure 210.

With particular reference to Fig. 6, the stationary parts 220 of gas boosting chamber 202 comprises a pair of upper support device 222, and these two upper support devices are separated from one another and be arranged under the upper bearing plate 211.Upper support device 222 defines the surface of facing 224, and they and define booster cavity 214 toward each other betwixt.Upper support device 222 also defines the bottom surface 226 towards vacuum tank 204.In described embodiment, each bottom surface 226 defines an elongated recess part 228, goes up pneumatic loaded tubes 230 fixed installations therein.Go up pneumatic loaded tubes 230 and be positioned at the laterally center of (cross-machine direction) suitably, and be preferably on the whole width of wet web 10 and extend.

The stationary parts 220 of gas boosting chamber 202 also comprises a pair of lower support device 240, this to lower support device 240 separated from one another and with 222 vertical separating of upper support device.The surface 244 that lower support device 240 defines end face 242 and faces.End face 242 is direct towards the bottom surface 226 of upper support device 222, and as shown in the figure, defines elongated recess part 246, and following pneumatic loaded tubes 248 fixed installations therein.Down pneumatic loaded tubes 248 is positioned at the laterally center of (cross-machine direction) suitably, and extend beyond suitably wet web width about 50% to 100%.In the illustrated embodiment, apart transverse support plates 250 is permanently connected with the surface of facing 244 of lower support device 240, and is used for making the vertical mobile more stable of sealing device 260.

Referring to Fig. 7, sealing device 260 comprises in addition: the transverse seal of a pair of CD of being called seal 262 (Fig. 5-7), and this transverse seal is separated mutually; A plurality of carriages 263 (Fig. 7) that are connected with CD seal 262; With a pair of longitudinal sealing spare, this longitudinal sealing spare is called as MD seal 264 (jail 5 and 7).CD seal 262 can vertically move with respect to stationary parts 220.Can select but desirable carriage 263 is fixedly connected on the CD seal 262,, like this, can vertically move with CD seal 262 so that structure support to be provided.Along the longitudinal 205, MD seal 264 is arranged between the upper support device 222 and between the CD seal 262.As described in detail below such, the some parts of MD seal 264 can vertically move with respect to stationary parts 220.Transversely, MD seal 264 is arranged near the edge of wet web 10.In a certain embodiments, in order to adapt to the possible excursion of deckle width, MD seal 264 is removable in the horizontal.

Illustrated CD seal 262 comprises: upright main wall part 266; From the top 270 outwardly directed lateral flange 268 of wall part, with the diaphragm seal 272 (Fig. 6) on the relative bottom 274 that is installed in wall part 266.Like this, outwardly directed flange 268 forms the relative upper and lower control surface 276 and 278 of the moving direction that is substantially perpendicular to sealing device 260.Wall part 266 and flange 268 can comprise separated components or separate part as shown in the figure.

As mentioned above, the parts of sealing device 260 can be between the advanced position shown in Fig. 3 and 4 and the operating position shown in Fig. 5 and 6 vertical moving.Particularly, the wall part 266 of CD seal 262 is arranged in the position control plate 250, and can slide with respect to it.Vertical amount of movement is determined by the ability that lateral flange 268 moves between the end face 242 of the bottom surface 226 of upper support device 222 and lower support device 240.

The upright position of the upright position of lateral flange 268 and CD seal 262 is controlled by opening pneumatic loaded tubes 230 and 248.Loaded tubes 230 operationally is connected with the control system (not shown) of pneumatic source and pneumatic shuttle with 248.Loaded tubes 230 can produce the downward power on the last control surface 276 that acts on CD seal 262 in the startup, thereby cause flange 268 to move downward up to till the end face 242 of lower support device 240 contacts, perhaps stop motion under the upward force effect that loaded tubes 248 or webbing tension force down produce.By starting following loaded tubes 248 and making loaded tubes 230 invalid, can realize the retraction of CD seal 262.In this case, following loaded tubes 248 upwards exerts pressure on the control surface 278, and flange 268 is moved towards the bottom surface of upper support device 222.Certainly, upper and lower loaded tubes 230 and 248 can be operated under different pressures, so that CD seal 262 moves.The other device that is used for controlling 262 vertical motions of CD seal can comprise other forms such as cylinder, hydraulic cylinder, bolt, jack (jacks), mechanical fastener or other appropriate device and be connected.Kent, the Seal Master company of Ohio can provide suitable loaded tubes 230 and 248.

As shown in Figure 6, a pair of spanning plate 279 strides across the gap between upper support device 222 and the CD seal 262, escapes to prevent pressure fluid.Like this, spanning plate 279 defines the part of booster cavity 214.Spanning plate 279 can be fixedly mounted on the opposed face 224 of upper support device 222, and can slide with respect to the inner surface of CD seal, and vice versa.Spanning plate 279 can for example Rec mulberry (LEXAN), metallic plate or analog be made by the semirigid low-friction material of fluid penetrable.

The function that the further feature of diaphragm seal 272 and pneumatic shuttle 200 combines is: pressure fluid is escaped between gas boosting chamber 202 and wet web 10 along the longitudinal be reduced to minimum.In addition, diaphragm seal 272 preferably is shaped in the mode that reduces the webbing wear extent.In specific embodiment, diaphragm seal 272 is made by elastoplast compound, pottery, coating metal substrate or analog.

Referring to Fig. 5 and 7, MD seal 264 is spaced from each other especially, and is fit to prevent that pressure fluid runs off along the side of pneumatic shuttle 200.Fig. 5 and 7 represents a MD seal 264 respectively, and MD seal 264 is along the edge of lateral arrangement at close wet web 10.As shown in the figure, each MD seal 264 comprises: lateral support member 280; End deckle band 282, this end deckle band operationally is connected with lateral support member 280; Driver 284, this driver are used for making end deckle band 282 to move with respect to lateral support member 280.Lateral support member 280 is arranged near the side of wet web 10 usually, and is usually located between the CD seal 262.As shown in the figure, each lateral support member 280 defines a passage 281 (Fig. 7) under the sensing, and end deckle band 282 wherein is installed.In addition, each lateral support member 280 defines looping pit 283, and driver 284 is installed in the looping pit.

Because the effect of air cylinder driven device 284, end deckle band 282 can move with respect to lateral support member 280.Connecting piece 285 (Fig. 5) will be held the output shaft coupling of deckle band 282 and air cylinder driven device 284.Connecting piece 285 can comprise one or more anti-T shape bars, therefore holds deckle band 282 to slide in passage 281, for example in order to change.

As shown in Figure 7, lateral support member 280 and end deckle band 282 define slit, to hold fluid impermeable sealing strip 286, and 0 shape loop material or analog for example.Sealing strip 286 helps the booster cavity 214 of blanket gas pressure device 200 to prevent to reveal.Sealing strip 286 is preferably widened at the interface place of slit between lateral support member 280 and end deckle band 282 wherein, so that adapt to relatively moving between these parts.

Spanning plate 287 (Fig. 5) is arranged between MD seal 264 and the upper bearing plate 211, and is fixedly mounted on the upper bearing plate 211.The lateral part of booster cavity 214 (Fig. 6) is limited by spanning plate 287.For example the sealing device that forms of the gasket material of fluid impermeable preferably is arranged between spanning plate 287 and the MD seal 264, allowing relatively moving between them, and can prevent the loss of pressure fluid.

Irrelevant with the upright position of CD seal 262, driver 284 provides controlled loading and the unloading of end deckle band 282 against upper support webbing 206 suitably.Load can accurately be controlled, to meet necessary sealing force.When not needing to eliminate whole end deckle bands and webbing wearing and tearing, end deckle band 282 regractings.Suitable driver can be provided by Bimba company.Perhaps, but use spring (end expression) to make end deckle band 282 be held against upper support webbing 206, although may sacrifice the ability of control end deckle band 282 positions.

Referring to Fig. 5, each end deckle band 282 has: near the end face or the limit 290 of connecting piece 285 layouts; Opposed bottom surface or limit 292, this bottom surface or limit 292 are arranged to contact with webbing 206 in use; With side surface or limit 294, this side surface or limit 294 next-door neighbour CD seals 262.The shape of bottom surface 292 is fit to cooperate with the bending of vacuum tank 204 suitably.In the position of CD seal 262 collision webbings 206 and 208, the shape of bottom surface 292 preferably meets the curvature of webbing collision.Like this, bottom surface 292 has core 296, and it is gone up at vertical (machine direction) and is laterally surrounded by separated end 298.The shape of core 296 is usually consistent with the shape of vacuum tank, simultaneously, and the webbing 206 that causes by CD seal 262 of adaptation and 208 the skew usually of the shape of end 298.For end 298 wearing and tearing that prevent to give prominence to, before CD seal 262 retractions, the 282 preferably withdrawals of end deckle band.End deckle band 282 is preferably made by the impermeable material of gas, and this material can make the wearing and tearing of webbing reduce to minimum.The concrete material that is fit to end deckle band 282 comprises polyethylene, nylon or analog.

MD seal 264 preferably can so preferably slidably be arranged to against CD seal 262 laterally moving.In illustrated embodiment, moving by leading screw or bolt 305 of MD seal 264 in the horizontal controlled, and leading screw or bolt 305 are by carriage 306 fix in position (Fig. 7).Leading screw 305 passes a screwed hole in the lateral support member 280, and the rotation of leading screw makes MD seal 264 move along axle.Also can use and be used for other device that the MD seal is moved, for example pneumatic means or analog in the horizontal.In an alternative embodiment, MD seal 264 are fixedly mounted on the CD seal 262, and therefore, whole sealing device 260 rises and the decline (not shown) together.In another alternative embodiment, lateral support member 280 is fixedly mounted on the CD seal 262, and end deckle band 282 is fit to not rely on CD seal 262 (not shown)s to move.

Vacuum tank 204 comprises a vacuum tank lid 300, and this lid 300 has end face 302, and lower support webbing 208 moves on this end face.Vacuum tank lid 300 and sealing device 260 are preferably slight curving, so that paper web control.Illustrated vacuum tank lid 300 forms like this: longitudinally 205 from leading edge to back edge be provided with sealing slide rail 313 in the first external seal slide rail 311, the first sealed vacuum district 312, first, sealing slide rail 321, the second sealed vacuum district 322 and the second external seal slide rails 323 (Fig. 6) in a series of totally four high vacuum region 314,316,318 and 320, the second of surrounding three inner slide rails 315,317 and 319.These sealing slide rails 315,317 and 319 and region of no pressure 314,316,318 and 320 in each be preferably in the overall with of transversely crossing over paper web and stretch.Each slide rail 315,317 and 319 comprises the best end face of being made by ceramic material, so that settle against lower support webbing 208, and can not cause significant webbing wearing and tearing.Suitable vacuum tank lid and slide rail can be made by plastics, nylon, coating steel or analog, and can be obtained by JWI company or IBS company.

Four high vacuum region 314,316,318 and 320 are the passages in the lid 300, and they operationally are connected with one or more vacuum source (not shown)s, thereby are evacuated to higher relatively level of vacuum.For example, can work to the vacuum of about 25 inches of mercury 0 in high region of no pressure 314,316,318 and 320, and particularly about 10 work to the vacuum of about 25 inches of mercury.Replace form of implementation as one of diagram passage, lid 300 can limit some holes or other shaped aperture (not shown), and they are connected with vacuum source, pass the flow of pressurized fluid of paper web with generation.In one embodiment, high region of no pressure 314,316,318 and 320 comprises some slits, and through measuring, each slit is of a size of 0.375 inch in the vertical, and this slit extends across the overall with of wet web.Any set point on paper web is exposed to the holdup time in the flow of pressurized fluid, it in illustrated embodiment the time on slit 314,316,318 and 320, suitable be about 10 milliseconds or still less, particularly about 7.5 milliseconds or still less, more particularly 5 milliseconds or still less, for example about 3 milliseconds or still less, even be about 1 millisecond or still less.The speed decision holdup time of high pressure vacuum slit 314,316,318 and 320 quantity and width and machine.The holdup time of selecting is depended on the fiber type that comprises in the wet web and the dehydrating amount of needs.

Can adopt the first and second sealed vacuum districts 312 and 322 to reduce the loss that pressure fluid flows out from pneumatic shuttle 200 as far as possible. Sealed vacuum district 312 and 322 is the passages in the lid 300, and it can be operably connected with one or more vacuum source (not shown)s, compares with four high vacuum region 314,316,318 and 320, and this vacuum source is desirable is evacuated to relatively low vacuum.Particularly, the ideal vacuum degree in sealed vacuum district is 0 to about 100 inches of water(in H vacuum.

The structure of pneumatic shuttle 200 preferably is arranged in CD seal 262 in sealed vacuum district 312 and 322.Specifically, be arranged in along the longitudinal in the first external seal slide rail 311 and first between the sealing slide rail 313 at the diaphragm seal 272 of the CD seal 262 of the front side of pneumatic shuttle 200, particularly the central authorities between them.The back diaphragm seal 272 of CD seal 262 similar arrangements along the longitudinal seals in second between the slide rail 321 and the second external seal slide rail 323, particularly the central authorities between them.As a result, sealing device 260 can descend, thereby CD seal 262 has departed from the normal running orbit of wet web 10 and webbing 206 and 208 towards vacuum tank 204, in order to illustrate, represents with the ratio of amplifying a little in Fig. 6.

Sealed vacuum district 312 and 322 effect are to reduce from the loss across the width of wet web 10 of the pressure fluid of pneumatic shuttle 200 as far as possible.Vacuum in sealed vacuum district 312 and 322 is 202 suction pressure fluids and from pneumatic shuttle 200 external suction ambient atmos from the gas boosting chamber.As a result, air-flow is introduced sealed vacuum district 312 and 322 from the outside of pneumatic shuttle 200, rather than pressure fluid is revealed in the opposite direction.Because high vacuum region 314,316,318 and 320 and sealed vacuum district 312 and 322 between the vacuum relative mistake, most pressure fluids from gas boosting chamber 202 flow into high vacuum region 314,316,318 and 320, rather than sealed vacuum district 312 and 322.

In another alternative embodiment that Fig. 8 partly represents, any in the sealed vacuum district 312 and 322 or two are not evacuated.On the contrary, in seal area 312 and 322 (only having represented 322), arrange deformable sealing deckle band 330, to prevent pressure fluid leakage in the vertical.In this case, pneumatic shuttle 200 vertically by collision webbing 206 with 208 with the diaphragm seal 272 of wet web 10 and the webbing 206 that is arranged to be close to or to contact deformable seal deckle band 330 and 208 and wet web 10 seal.CD seal 262 collision webbings 206 with 208 with wet web 10 and CD seal 262 by deformable seal deckle band 330 be positioned at webbing 206 with 208 with wet web 10 relative sides on this structure, have been found that to form the sealing of special effective gas pumping chamber.

Deformable sealing deckle band 330 preferably extends across the overall with of wet web 10.All seal with the front end of blanket gas pressure device 200 or rear end or the two.When deformable seal deckle band 330 strode across the extension of paper web overall with, sealed vacuum district 312 and 322 can break away from vacuum source and be connected.Adopt in the situation of an overall with deformable seal deckle band 330 in the rear end of pneumatic shuttle 200, vacuum plant or blow box can be adopted in downstream at pneumatic shuttle 200, when 208 separate, paper web 10 is remained on one of them webbing 206 or 208 with convenient webbing 206.

Deformable sealing deckle band 330 preferably includes such two kinds of materials: a kind of material is the material with respect to webbing 208 preferential wear, this means when using webbing 208 and this material, this fret wear and tangible wearing and tearing can not take place webbing, another kind of material is flexible, along with its collision webbing 208 can depart from.Under any situation, preferably gas is impermeable for deformable sealing deckle band 330, and preferably includes the material with high useless volume, for example Feng Bi mesh foam (cell foam) or analog.In a certain embodiments, deformable seal deckle band comprises and records the mesh foam that thickness is 0.25 inch sealing.Best is that deformable seal deckle band 330 itself weares and teares to cooperate the path of webbing 206 and 208.Deformable seal deckle band 330 is preferably subsidiary backing plate 332, is used for structure support, for example the aluminium bar.

In the embodiment that does not use overall with sealing deckle band, paper web laterally needs the sealing device of some kinds.Above-mentioned deformable seal deckle band 330 or other suitable device as known in the art can be used for hindering pressure fluid and pass the outside that webbing 206 and 208 laterally flows to wet web 10.

In order to produce effective sealing of crossing paper web, have been found that: it is an important factor that CD seal 262 collision upper support webbings 206 evenly cross the interior degree of wet web 10 width.Also find: essential collision degree is the pressure reduction and the function in the gap between the pressure reduction between booster cavity 214 and sealed vacuum district 312 and 322, CD seal 262 and vacuum tank lid 300 in this case on maximum tension, the paper web two sides of upper and lower supporting fabrics band 206 and 208.

In addition referring to the schematic diagram of the back hermetic unit of pneumatic shuttle shown in Figure 9 200,262 collisions of CD seal enter in the upper support webbing 206 the smallest ideal impact momentum, i.e. h (min) is found by following equation and represents: $h\left(\min \right)=\frac{T}{W}(\cosh \left(\frac{\mathrm{Wd}}{T}\right)-1);$

Wherein, T is to be the tension force of the webbing of measuring of unit with pound/inch;

W is to be the pressure reduction on the unit paper web two sides of measuring with psi; With

D be with inch unit measure vertically on the gap.

Fig. 9 represents that back CD seal 262 makes the side-play amount of upper support webbing 206, with arrow " h " expression.Upper and lower supporting fabrics band 206 and 208 maximum tension are by arrow " T " expression, and webbing tension force is measured by standard tensometer or other suitable method that Huyck company provides.The gap between the sealing slide rail 321 is represented by arrow " d " in the diaphragm seal 272 of the 205 CD seals of measuring 262 and second along the longitudinal.The gap " d " that is used for determining the collision degree is the gap on higher differential pressure one side of diaphragm seal 272, i.e. gap on booster cavity 214, this be because the pressure reduction on this side webbing 206 and 208 and the position of paper web 10 have maximum influence.Best, the gap between the diaphragm seal 272 and second external slide rail 323 is almost identical even littler with gap " d ".

Upright position to the aforesaid minimum collision degree of regulating CD seal 262 is the decisive factor of CD sealing effectiveness.When determining the effect of sealing, be applied to loading force on the sealing device 260 and play a part lessly, and only need it is adjusted to the amount that needs, to keep essential collision degree.Certainly, the webbing wear extent will be used the commerce of pneumatic shuttle 200 and bring adverse effect.Webbing can not wear and tear basically in order to reach effective seal, and the collision degree preferably equals or is slightly larger than above-mentioned minimum collision degree.In order to reduce the variation of the webbing degree of wear of crossing its width, the power on the webbing of being applied to is preferably in and transversely keeps constant as far as possible.This can be by the 262 controlled and uniform loadings of CD seal or CD seal 262 in check positions and CD seal 262 the even geometric shape of collision realized.

In use, control system makes the sealing device 260 of gas boosting chamber 202 drop to work firmly to put.At first, CD seal 262 descends, thereby diaphragm seal 272 collision upper support webbings 206 are to above-mentioned degree.Particularly, the pressure in upper and lower loaded tubes 230 and 248 is conditioned, thereby CD seal 262 is moved downward, thus up to by lateral flange 268 with till lower support device 240 contacts stop motion, perhaps till passing through the webbing equalization of strain.The second, the end deckle band 282 of MD seal 264 drops to upper support webbing 206 and contacts or be close to.As a result, gas boosting chamber 202 and vacuum tank 204 all against the wet web sealing, go out to prevent flow of pressurized fluid.

Then, start pneumatic shuttle 200, thereby pressure fluid fills up gas boosting chamber 202, and form the air-flow that sees through paper web 10.In the embodiment shown in fig. 6, high vacuum and low vacuum act on high vacuum region 314,316,318 and 320 and sealed vacuum district 312 and 322 on so that gas flow, sealing and remove moisture.In the embodiment of Fig. 8, pressure fluid flows to high vacuum region 314,316,318 and 320 from gas boosting chamber 202, and deformable seal deckle band 330 is blanket gas pressure device 200 in the horizontal.Resultant pressure reduction that passes wet web 10 and the air-flow that sees through paper web 10 effectively dewater paper web 10.

Many structures of pneumatic shuttle 200 and work characteristics only help to allow pressure fluid seldom to escape, and and the less wearing and tearing of webbing combine.Collision webbings 206 and 208 and the CD seal 262 of wet web 10 are used in beginning, pneumatic shuttle 200.Determine the collision degree so that make the best results of CD sealing.In one embodiment, pneumatic shuttle 200 utilizes sealed vacuum district 312 and 322, crosses wet web 10 width with generation and flows into outside air in the pneumatic shuttle 200.In another embodiment, deformable seal part 330 is arranged in the sealed vacuum district 312 and 322 relative with CD seal 262.Under any situation, for the needs that the matching surface that reduces between gas boosting chamber 202 and vacuum tank 204 accurately aligns as far as possible, CD seal 262 preferably is arranged to be positioned to small part the passage of vacuum tank lid 300.And sealing device 260 can be against stationary parts, and for example the lower support device 240 that is connected with frame structure 210 loads.

As a result, the loading force of pneumatic shuttle 200 is independent of the pressure fluid pressure in the gas boosting chamber 202.Owing to use low webbing lost material and lubricating system, the webbing wearing and tearing are reduced to minimum.The proper lubrication system can comprise chemical lubricants, for example oil emulsion, release agent or other similar chemicals, or water.The using method of typical lubricants comprises: spray the lubricant of dilution in the horizontal in even mode, the atomized soln of water (hydraulically) or gas, the woollen blanket wiping of the solution that concentration is higher, perhaps known method in other spraying system is used.

Observation shows: the ability of pumping chamber's pressure operation depends on the ability revealed of preventing under elevated pressures.By with respect in the past or the distribution of the operating noise of the mistakes air flow that occurs of the operation of expection, increase, moisture and under extreme case, comprise regular or irregular defective in the wet web of hole and line etc., existence that can detection of leaks.Seal member by calibration or adjusting pneumatic shuttle can keep in repair to avoid leakage.

In pneumatic shuttle 200, the even dehydration that paper web 10 is provided that uniform airflow in the horizontal can be desirable.Flow uniformity transversely for example can be used the such mechanism of convergent pipeline on pressure and vacuum side and improve, and can utilize the hydrodynamic model of calculating to design its shape.Because paper web basic weight and moisture content can not be even in the horizontal, preferably adopt attachment device so that obtain uniform airflow in the horizontal, for example: be provided with the independent control area of buffer at pressure or inlet side, thereby make variations in flow according to sheet properties; One baffle plate, it is used for obtaining significant pressure drop before the wet web in air-flow; Or other guider.The control CD inhomogeneity other replacement method of dewatering also can comprise external device (ED), such as: zonal control steam jet ejector, for example Dublin.Devronizer steam jet ejector or similar device that the Honeywell-Measurex Systems company of 0hio provides.

On the device that is transformed into by typical crescent former paper handkerchief paper machine shown in Figure 10, can finish the technical process of other embodiment of the present invention.The elementary wet web 410 that forms paper fibre slurry is deposited between the circulation loop of the circulation loop of first webbing 414 and second webbing 424 from head box 412.Woollen blanket in the crescent former paper handkerchief paper machine of second webbing, 424 common replacement standards.The denseness of this slurry and flow velocity are determined the basic weight of dried paper web, and ideally, it is about 5 to about 80 gram/square metre (gsm), be better about 8 to arrive about 40gsm.One of them can be the forming fabric band at least in the webbing 414 and 424, preferably first webbing 414.In addition, one of them can be molded webbing at least in the webbing 414 and 424, preferably second webbing 424.

When elementary wet web 410 transmitted between first webbing 414 and second webbing 424, the action of centrifugal force that produces when walking around forming rolls 452 owing to the tension force on first webbing 414 and its made this elementary wet web 410 partial dehydrations.In case finish the partial dehydration step, by using or do not use vacuum slide rail 450, and wet web 410 be sent to or remain on second webbing 424.

The present invention runs up in order to realize, the traditional paper handkerchief dewatering before the drying cylinder 430 of heating may not fully be removed moisture, so just needs the additional dehydration device.In the illustrated embodiment, pneumatic shuttle 416 is used for making paper web 410 non-extruding dehydrations.Shown in pneumatic shuttle 416 comprise: be arranged in forced air gas boosting chamber 418 device on the wet web 410; Be expressed as the fluid collection device 420 of vacuum tank form, this gathering-device is arranged in below the supports fabrics band 422, and with the gas boosting chamber 418 and second webbing, 424 operatively associates of forced air.(in other alternative embodiment, fluid collection device 20 can be provided with second webbing, 424 adjacency, keep operatively associates with the gas boosting chamber 418 of forced air and supports fabrics band 422).When passing pneumatic shuttle 416, wet web 410 is sandwiched between second webbing 424 and the supporting fabrics band 422, so that hermetically against wet web 410, and can not damage wet web 410.

The basic rate that pneumatic shuttle 416 provides moisture to break away from can make paper web obtain being higher than 30% degree of drying before on being attached to as the drying cylinder 430 of raising basic drier and so on, does not preferably need basic extrusion dehydration.Several embodiment of pneumatic shuttle 416 can be described hereinafter in more detail.It is 08/647 that other suitable embodiment is disclosed in Application No., in 4508 the document, this patent document is people such as M.A.Hermans in the application on May 14th, 1996, and name is called " making the method and apparatus in the soft paper ", and this patent documentation is incorporated as a reference at this.

After pneumatic shuttle 416, wet web 410 is further with second webbing 424 and 422 operations of supports fabrics band, transmit under the help of slide rail 426 or do not have it to help passing on the vacuum at station place, return arrival preferably with second webbing 424 of the webbing of texture up to transmission.

Second webbing 424 can comprise three-dimensional through-air-drying fabric band, for example, this through-air-drying fabric band is at the people's such as K.F.Chiu of announcement on July 4 nineteen ninety-five United States Patent (USP) 5,429, open in 686, as the reference combination, perhaps second webbing 424 can comprise fabric or bondedfibre fabric band other weaving, the band texture to this patent at this.Second webbing 424 can with the webbing antitack agent for example the mixture of silicon or hydrocarbon handle so that wet web 410 is separated with second webbing 424.The webbing antitack agent can be sprayed on second webbing 424 before grasping paper web.In case be sprayed on second webbing 424, although during grasping, transmitting slide rail 426 places at least because vacuum power carries out molded, can molded fully wet web 410, but wet web 410 can also lean against on second webbing 424 by further molded by utilizing vacuum pressure or light pressure (not shown).

Then, be pressed against on the drying cylinder 430 of heating by pressure roller 432 at the wet web 410 on second webbing 424.Drying cylinder 430 is equipped with vapour hood or raises basic drier cover 434.This cover 434 utilizes usually and is in about 300 °F or higher, particularly about 400 °F or higher, more especially about 500 °F or higher, and the jet that adds hot-air under the most about 700 or the higher temperature, jet direction is crossed flow device from nozzle or other and is directly pointed to tissue web 410, like this, in hood 434, gas jet has the maximal rate or the part average speed of one of following level: about 10 meter per seconds (m/s) or bigger, about 50m/s or bigger, about 100m/s or bigger, about 250m/s or bigger.

Wet web has about 30% or bigger fiber consistency suitably when being attached on the heated drying cylinder 430, is in particular about 35% or bigger, for example between about 35% and about 50%, and is more preferably about 38% or bigger fiber consistency.When heated drying cylinder 430 is removed, the aridity of wet web 410 is increased to about 60% or bigger, and particularly about 70% or bigger, more especially about 80% or bigger, more specifically 90% or bigger, most particularly between about 90% and about 98%.But part dry wet paper web 410 on heated drying cylinder 430, and about 40% to about 80% denseness wet creasing, dry then (back is dry) is to about 95% or bigger denseness.Can use unconventional cover and impact system as substitute or the additives of raising basic drier cover 434, to strengthen the aridity of wet web 410.Additional heated drying cylinder 430 or other drying equipment are non-extruding drying machine especially, can use after first heated drying cylinder 430.Suitable back drying equipment comprises one or more heated drying cylinders 430, as raises basic drier and slack tank drying machine, impingement drying machine or any other commercial efficient drying equipment.Form of implementation as an alternative, if second webbing 424 is molded webbings, can be so molded wet web 410 can be on heated drying cylinder 430 bone dry and dry creped.Aridity on heated drying cylinder 430 depends on these factors, as: the size of the speed of wet web 410, heated drying cylinder 430, the amount of wetness of wet web 410 etc.

The dry fabric 436 that is produced is for example pulled out or is spread out of from heated drying cylinder 430 by creping blade 428, and it is wound on the roller 438 then.Illustrated Interface Control mixture 440 before wet web 410 and heated drying cylinder 430 surfaces contact, is ejected into from spray line 442 with Sprayable on the surface of heated drying cylinder 430 of rotation.As the heated drying cylinder 430 lip-deep alternative that are sprayed directly on rotation, Interface Control mixture 440 can be applied directly on wet web 410 or the heated cylinder surfaces 430 by photogravure, perhaps can be incorporated in the aqueous fibre mass suspension in the green end of paper machine.When being positioned at heated drying cylinder 430 surfaces, the also available chemical method of wet web 410 is handled, and for example by printing on dry-web 410 or direct spray solution, comprises and adds solvent to impel from the separation on heated drying cylinder 430 surfaces.

Interface Control mixture 440 can comprise traditional drying machine antitack agent that creases adhesive and/or be used for wet pressing and crease and operate.Also can use following such Interface Control mixture 440 to remove dried paper web 436 from heated drying cylinder 430 surfaces, and do not crease, that such mixture is applied on the same day in people such as F.G.Druecke and the application, application number is unknown and name is called in the U.S. Patent application of " method of producing the low density resilient webs width of cloth " openly, provide as a reference at this.

Figure 11 shows another alternative embodiment, and at this, the elementary wet web 510 that forms paper fibre slurry is deposited between the circulation loop of the circulation loop of first webbing 514 and second webbing 524 from head box 512.Woollen blanket in the crescent former paper handkerchief paper machine of second webbing, 524 common replacement standards.One of them can be the forming fabric band at least in the webbing 514 and 524, preferably first webbing 514.In addition, one of them can be molded webbing at least in the webbing 514 and 524, preferably second webbing 524.

When elementary wet web 510 transmitted between first webbing 514 and second webbing 524, the action of centrifugal force that produces when walking around forming rolls 552 owing to the tension force on first webbing 514 and its made this elementary wet web 510 partial dehydrations.In case finish the partial dehydration step, when its between first webbing 514 and second webbing 524 time, can selectively further dewater by vacuum tank 546 or other suitable devices, by using or do not use vacuum slide rail 550, and wet web 510 is sent to or remains on second webbing 524.

When wet web 510 was clipped between second webbing 524 and the supports fabrics band 522, pneumatic shuttle 516 was used for making paper web 510 non-extruding dehydrations.Shown in pneumatic shuttle 516 comprise: the device that is arranged to operationally the forced air gas boosting chamber 518 that interrelates with vacuum tank 520.When it passed through pneumatic shuttle 516, wet web 510 was clipped between second webbing 524 and the supports fabrics band 522, and supports fabrics band 522 is between wet web 510 and vacuum tank 520.(in other alternative embodiment, second webbing 524 can be arranged between wet web 510 and the vacuum tank 520).

Then, under the help of vacuum slide rail 526 or do not have under the situation of its help, wet web 510 is further transmitted turns back to second webbing 524.The roller 555 of the operation of supports fabrics band 522 is positioned to change the direction of second webbing 524, supports fabrics band 522 and wet web 510, so that wet web 410 be sent to raise basic drier or other heated drying cylinders 530 before, its very little may separation with suction press roll 532.Roller 555 has reduced not support the paper wrap angle sigma, thereby wet web 510 its chance of separating with second webbing 524 before being sent to heated drying cylinder 530 is reduced to minimum.

Afterwards, the wet web 5 10 on second webbing 524 presses against on the drying cylinder 530 by pressure roller 532.Wet web 510 on second webbing 524 by pressure roller 532 preferably so that the mode that does not support paper wrap angle sigma angle minimum on the pressure roller 532 be pressed against on the drying cylinder 530.Do not support the paper wrap angle sigma angular range can from 0 to about 90 the degree, from 0 to about 45 the degree, from 0 to about 10 the degree.In addition, less do not support the size that the paper wrap angle sigma has reduced the region of no pressure that needs, reduced in pressure roller, producing the required energy of vacuum thus.When wet web 510 is sent on the drying cylinder 530, be not defined as the circumferential section (the expenditure numerical table shows) that pressure roller 532 is twined by wet web 510 with supporting the paper wrap angle sigma, this part from wet web 510 at the first make contact on the pressure roller 532 to the last contact point of wet web 510 on pressure roller 532.

Heated drying cylinder 530 is equipped with vapour hood or raises basic drier cover 534.The dry-web 536 that the result obtains is drawn out or spreads out of from drying cylinder 530, and does not remove with not creasing, is wound up into afterwards on the roller 538.Measure along the tangent line on heated drying cylinder 530 surfaces at burble point, the angle of the dry-web 536 of pulling out from the surface of heated drying cylinder 530 is spent about 100 degree for about 80 suitably, although it can be according to different running speeds and different.

Interface Control mixture 540 is sprayed onto from spray line (spray boom) 542 with Sprayable on the surface of heated drying cylinder 530 of rotation.For example, Interface Control mixture 540 can comprise the mixture of polyvinyl alcohol, D-sorbite and He Gelisi (Hercules) M1336 polyglycols, and this mixture adding has in the aqueous solution that is less than 5% solid, the dosage between 50 and 75 milligrams/square metre by weight percentage.The consumption that adheres to compound and antitack agent must be balanced adhering to wet web 510, thereby it can not rise and enters in the cover, and allows the paper web 536 of drying is pulled out and do not creased from drying cylinder 530.

Figure 12 illustrates another alternative embodiment.Except first webbing 614 extends as the supports fabrics 522 shown in Figure 11, the embodiment of this embodiment and Figure 11 is similar.Owing to improve the minimizing of the required webbing quantity of this technology, it is provided at the possibility of capital cost and the reduction of running cost aspect.In the embodiment show in figure 12, the elementary wet web 610 that forms paper fibre slurry is deposited between the circulation loop of the circulation loop of first webbing 614 and second webbing 624 from head box 612.Woollen blanket in the crescent former paper handkerchief paper machine of second webbing, 624 common replacement standards.One of them can be the forming fabric band at least in the webbing 614 and 624, preferably first webbing 614.In addition, one of them can be molded webbing at least in the webbing 614 and 624, preferably second webbing 624.

Elementary wet web 610 is between first webbing 614 and second webbing 624 time, because the action of centrifugal force that produces when the tension force on first webbing 614 and its are walked around forming rolls 652, make this elementary wet web 610 partial dehydrations, and further dewater by selectable vacuum tank 646 or other suitable devices.When wet web 610 was clipped between first webbing 614 and second webbing 624, pneumatic shuttle 616 was used for making paper web 610 non-extruding dehydrations.Shown in pneumatic shuttle 616 comprise: the device that is arranged to operationally the forced air gas boosting chamber 618 that interrelates with vacuum tank 620.When it passed through pneumatic shuttle 616, wet web 610 was clipped between second webbing 624 and the supports fabrics band 622, and supports fabrics band 622 is between wet web 610 and vacuum tank 620.(in other alternative embodiment, second webbing 624 can be arranged between wet web 610 and the vacuum tank 620).

Then, under the help of vacuum slide rail 626 or do not have under the situation of its help, wet web 610 is further transmitted turns back to second webbing 624.Wet web 610 on second webbing 624 presses against on the drying cylinder 630 by pressure roller 632.Heated drying cylinder 630 is equipped with vapour hood or raises basic drier cover 634.The dry-web 636 that the result obtains is drawn out or spreads out of from drying cylinder 630, and does not remove with not creasing, is wound up into afterwards on the roller 638.Measure along the tangent line on heated drying cylinder 630 surfaces at burble point, the angle of the dry-web 636 of pulling out from the surface of heated drying cylinder 630 is spent about 100 degree for about 80 suitably, although it can be according to different running speeds and different.

Interface Control mixture 640 is sprayed onto from spray line 642 with Sprayable on the surface of heated drying cylinder 630 of rotation.For example, Interface Control mixture 640 can comprise the mixture of polyvinyl alcohol, D-sorbite and He Gelisi (Hercules) M1336 polyglycols, and this mixture adding has in the aqueous solution that is less than 5% solid, the dosage between 50 and 75 milligrams/square metre by weight percentage.The consumption that adheres to compound and antitack agent must be balanced adhering to wet web 610, thereby it can not rise and enters in the cover 634, but allows the paper web 636 of drying is pulled out and do not creased from drying cylinder 630.

As mentioned above, the pneumatic shuttle 200 that makes wet web 410,510 or 610 dehydrations has been described in Fig. 3-6.Can be used in Figure 10,11 with the equipment shown in 12 on sealing device and superincumbent Fig. 7,8 and 9 in the sealing device 260 of explanation the same.

[example]

Following example helps to understand in more detail the present invention.Specific content, ratio, component and parameter all are exemplary, are not in order to limit the scope of the invention particularly.

Example 1

Make 12 inches wide paper handkerchiefs of manufacturing on the paper napkin machine a experiment with 22 inches wide webbings, this paper handkerchief is made by fiber slurry, and this fiber pulp comprises the brown paper northern softwood fiber (kraftnorthern softwood fibers) of bleaching and unpurified 50: 50 fibre blend of brown paper eucalyptus fiber (kraft eucalyptusfibers) of bleaching.Utilize layering, three layers of head box, by from these slurries of each layer deposit, have the mixing paper of 19gsm nominal basis weight, thereby paper handkerchief be shaped with formation.Two woodss that head box is ejected into slurries in the two net shaped portions with suction roll former are matched between net (Lindsay Wire) the 2164B forming fabric bands.In order to control intensity, before forming process, the speed with 1000 ml/min in raw material is added the Parez 631NC that contains 6% solid.

When between two forming fabric bands during with the speed deposit of 1000 feet per minute clocks (fpm), elementary wet web transmits on four vacuum tanks, and these four vacuum tanks are worked under the vacuum pressure near 11,14,13 and 19 inch of mercury vacuum respectively.And being included in elementary wet web between two forming fabric bands through pneumatic shuttle, this pneumatic shuttle comprises and operationally interkniting and a gas boosting chamber and a collecting box of integral sealing mutually.With air pressurized to 15 pound/square inch, and collecting box is worked under about 11 inch of mercury vacuum under about 150 Fahrenheit temperature in the gas boosting chamber.Wet web is exposed under the final pressure reduction of about 41.5 inches of mercury, and is being that 7.5 milliseconds, each slit length are 3/8 through the holdup time on four slits " condition under, be exposed under the air-flow of 68 SCFM/ square inches.Just the denseness of wet web is about 30% before pneumatic shuttle, and the denseness when leaving pneumatic shuttle is about 39%.

Utilize the vacuum pick slide rail to transmit the wet web that took off water then, this vacuum pick slide rail is being worked on the three dimensional fabric band of elite stand match net (Lindsay Wire) T-216-3 TAD fabric under about 10 inch of mercury vacuum.Just before transmitting, a kind of silicon latex in the water is sprayed onto on paper one side of this T-216-3 webbing, raises on the basic drier so that be ultimately delivered to from the forming fabric band.Organic siliconresin applies with the flow velocity of 400 ml/min under the condition that contains 1.0% solid.Then, this TAD webbing presses the surface of raising basic drier, and traditional pressure roller that utilization has with the maximum squeeze pressure work of 350pli squeezes.This webbing twines about 39 inches by transfer roller raising on the surface of basic drier, and this transfer roller can unload or remove a little from raising basic drier.

Using the adhesive mixture that wet web is adhered to raises on the basic drier, this adhesive mixture is to be added in the water by the polyvinyl alcohol AIRVOL 523 of Air Products and Chemical company manufacturing and D-sorbite to make, under about 0.4 gallon/flow velocity of fair clock (gpm) and the operating condition of about 40psig, in water, add by four #6501 nozzles making by Spraying Systems company.Spraying has about by weight percentage 0.5% solid concentration.Dried paper web creases when basic drier takes off from raising, and has the final aridity of about 92% denseness, and is wrapped on the fuse.Use standard technique to convert product to 2 layers of bathroom paper handkerchief then.The result of example 1 represents in the following Table 1.

Table 1

Test	Unit	Example 1 the present invention (creasing)	Example 2 the present invention (not creasing)	Example 3 (Comparative Examples)	Example 4 (Comparative Examples)
						The hardness of volume	????0.0 ?01″	????104	????140	????134	????178
The diameter of volume	????mm	????126	????128	????125	????125
						The paper number		????253	????180	????280	????198
Fuse external diameter (core 0D)	????mm	????40	????40	????46	????46
						The thickness of paper (2kPa, 8 layers)	Micron	????1667	????2402	????1288	????1719
MD intensity	????g/3 ??″	????1739	????1911	????2285	????1719
						MD extends	????％	????14	????13	????22	????15

Rate
						CD intensity	????g/3 ??″	????972	????1408	????718	????700
????GMT	????g/3 ??″	????1300	????1640	????1281	????1097
						The volume that parches is heavy	????G	????133	????95	????158	????106
The basic weight that parches	????g/m ??2	????19.1	????18.8	????20.6	????20.4
						Absorbability	????G	????97.4	????117.2	????79.0	????97.0
Absorbability	G water)/g (fiber)	????11.8	????14.1	????10.8	????11.0

Example 2

Make 12 inches wide paper handkerchiefs of manufacturing on the paper napkin machine a experiment with 22 inches wide webbings, made by fiber slurry in this paper, this fiber pulp comprises unpurified 50: 50 fibre blend of the brown paper eucalyptus fiber of the brown paper northern softwood fiber of bleaching and bleaching.Utilize layering, three layers of head box, by from these slurries of each layer deposit, have the mixing paper of 19gsm nominal basis weight with formation.Head box slurries are ejected in the two net shaped portions with suction roll former two woodss match net (Lindsay Wire) 2164B forming fabric bands between.In order to control intensity, before forming process, the speed with 1000 ml/min in raw material is added Parez 631 NC that contain 6% solid.

When between two forming fabric bands and with the speed deposit of 1000 feet per minute clocks (fpm), elementary wet web transmits on four vacuum tanks, and these four vacuum tanks are worked under the vacuum pressure near 11,14,13 and 19 inch of mercury vacuum respectively.And still being included in elementary wet web between two forming fabric bands through pneumatic shuttle, this pneumatic shuttle comprises and operationally interkniting and a gas boosting chamber and a collecting box of integral sealing mutually.With air pressurized to 15 pound/square inch, and collecting box is worked under about 11 inch of mercury vacuum under about 150 Fahrenheit temperature in the gas boosting chamber.Wet web is exposed under the final pressure reduction of about 41.5 inches of mercury, and is being that to be 3/8 " under the condition of (inch), be exposed under the air-flow of 68 SCFM/ square inches for 7.5 milliseconds, each slit length through the holdup time on four slits.Just the denseness of wet web is about 30% before pneumatic shuttle, and the denseness when leaving pneumatic shuttle is about 39%.

Utilize the vacuum pick slide rail to transmit the wet web that took off water then, this vacuum pick slide rail is being worked on the three dimensional fabric band of elite stand match net (Lindsay Wire) T-216-3 TAD fabric under about 10 inch of mercury vacuum, and its transfer rate is than forming fabric band slow 20%.Just before transmitting, a kind of silicon latex in the water is sprayed onto on paper one side of this T-216-3 webbing, raises on the basic drier so that be ultimately delivered to from the forming fabric band.Then, this TAD webbing presses the surface of raising basic drier, and traditional pressure roller that utilization has with the maximum squeeze pressure work of 350pli squeezes.This webbing twines about 39 inches by transfer roller raising on the surface of basic drier, and this transfer roller can unload or remove a little from raising basic drier.

Wet web utilizes the Interface Control mixture to adhere in check mode and raises on the basic drier, this Interface Control mixture is that unit comprises: about 26% polyvinyl alcohol with the active solid degree, 46% D-sorbite and 28% He Gelisi (Hercules) M1336 polyglycols, these compositions are with 50 and 75mg/m ²Between dosage add.Mixture is prepared into by weight percentage the aqueous solution less than 5% solid.Wet web is dried to about 90% denseness raising on the basic drier, " peel off " paper by applying enough winding tensions on the basic drier from raising then, so that just in time removed dry paper before creping blade.Paper is wrapped on the fuse and need not adds squeezing then.Use standard technique to convert product to 2 layers of bathroom paper handkerchief then.Expression in the superincumbent table 1 of the result of example 2.

Example 3 (Comparative Examples)

Paper is that the brown paper northern softwood of 50: 40: 10 bleaching, the brown paper eucalyptus of bleaching and the mixture of cork BCTMP fiber form by mixed proportion, and it is to utilize fourdrinier board forming machine (Fourdrinier former) to be shaped under the operating condition of approximate 3500fpm.The wet web that resultant basic weight is about 20gsm is sent to standard wet pressing woollen blanket (use couch roll) from the forming fabric band.Use standard method that wet web is transported on the basic drier of 15 feet raise, and be sent to this and raise on the basic drier.Use standard technology to make wet web raise drying on the basic drier, and paper is removed from drying machine under about 95% denseness with creping blade.

In order further to increase thickness, this paper web is sent to second through open draw and raises basic drier (this drying machine turns round) under the condition of no common guard shield, and uses a kind of latex adhesive (Latexadhesive) that it is adhered to and raise on the basic drier.Then, dried paper web creases and is wrapped on the fuse.Use standard technique that product is changed system into 2 layers of bathroom paper handkerchief then.Used method is called as independent recurrence wrinkle method in this example, and this method can be referring to English figure patent documentation GB 2179949B, GB2152961A and GB 2179953B, and they are incorporated as a reference at this.Expression in the superincumbent table 1 of the result of example 3.

Example 4 (Comparative Examples)

Wet web is that the mixture of the brown paper eucalyptus fiber of 65: 35 the brown paper northern softwood of bleaching and bleaching forms by mixed proportion.Use two net forming machines to form the wet web of hierarchy, and the eucalyptus fiber is in the wet web outside (air side).Utilize traditional vacuum dehydration technology, wet web is dewatered to denseness near 27%, use the denseness of standard technique impingement drying to nearly 90% then.Then wet web is sent to and raises basic drier, use PVA to adhere to, and be dried to 97% denseness as adhesive.Wet web is rolled onto on the fuse then.Use standard technique that product is changed system into two-layer bathroom paper handkerchief then.Expression in the superincumbent table 1 of the result of example 4.

The data of table 1 clearly illustrate that, utilize the present invention can obtain the improvement of paper/volume performance.In the form of creasing (example 1), adopt additional recurrence crape step to compare with special with the thickness of controlling (example 3) for the bulk density that increases control, the bathroom tissue products that the present invention produces has bigger paper sheet thickness, and its thickness ratio is 1288 microns of 1667 microns ratios.If should not recur the crape step, its difference in thickness will be bigger, because recurrence crape step increases about thickness more than 30% usually.From the viewpoint of performance of volume, when keeping identical coil diameter, this additional thickness allows to remove 27 paper (counting from 280 to 253).In fact, although number of paper reduces, the coil paper that is to use the present invention to produce more solid under identical coil diameter (104 to 134, the less bigger hardness of number representative).Consider that from integral body when forming good coil paper performance, the weight that the present invention allows to roll up reduces to 133 grams (16%) from 158 grams.

When considering the example (example 2) that does not crease, the improvement of the performance of volume even more remarkable.Here, in diameter that keeps volume and hardness, the paper number reduces to 180 (contrasts therewith, the paper number is 280 under the control situation).In this case, the weight of volume has reduced 40%.

In addition, product of the present invention can be compared with the example 4 described impingement drying products that crease.Obviously, has about equally performance at this products of aspect such as coil paper bulk densitys.In fact, the example of impingement drying demonstrates lower hardness, and this shows product of the present invention even better than the product of impingement drying method.

Example 5

Wet web is that the fibre blend of 50: 30: 20 southern BK bleached kraft pine, BK bleached kraft northern softwood and BK bleached kraft eucalyptus is shaped making on the paper napkin machine with the experiment of about 50fpm running by mixed proportion.The basic weight that the result obtains be about 41 the gram/square metre wet web on the forming fabric band, transport, be sent to then on the molded webbing of T-216-3.Transmitting point, elementary fabric passes pneumatic shuttle, and this pneumatic shuttle comprises and operationally connecting each other and the gas boosting chamber and the collecting box of (integral body) sealing mutually.At this point, wet web is dewatered to the denseness of 32-45% from approximate 10% denseness of postforming.Wet web is transported to one then and raises basic drier, it is sent to this at this and raises on the basic drier, this is raised basic drier and uses the polyvinyl alcohol that sprays through calibrating nozzle to adhere to wet web, and is dried to 55% denseness.Then, wet web is sent to back drier (afterdriers) so that final dry and be wound on the fuse.The dried paper web that obtains afterwards uses the butterfly embossed pattern to carry out embossing, to obtain final single-part stationery towel products.Expression in result's table 2 below of example 5.

Example 6

Utilization is with the long tube of the modified form forming machine (Fourdrinier styleformer) of 250fpm machine speed running, and making mixed proportion is the brown paper southern softwood and the cork BCTMP fibre blend formation wet web of 65: 35 bleaching.Basic weight near 50 grams/square metre final wet web be sent to standard wet pressing woollen blanket, and be transported to and raise basic drier.At the pressure roll nip place, use standard wet pressing technology that wet web is sent to and raise basic drier.Use polyvinyl alcohol that wet web is adhered to drying machine, and under approximate 55% denseness, crease.Dried then paper web is transported to a series of slack tank drying machines through open draw, is dried to approximate 95% denseness and is wrapped on the fuse at this wet web.Use standard technique that product is changed system into one deck paper towel then.Expression in result's table 2 below of example 6.

Table 2 clearly shows the intrinsic product advantage of the present invention.Although basic weight has reduced 19%, the paper towel that utilizes the present invention to produce is compared with the extensive wet control of creasing has superiority aspect thickness and the absorbability.

Table 2

Test	Unit	Example 5 the present invention	Example 4 (Comparative Examples)
				The hardness of volume	Inch	????0.191	?????0.277
The diameter of volume	Inch	????5.3	?????5.0
				The paper number		????80	?????85
Fuse external diameter (core OD)	????mm	????42	?????37
				The thickness (10 of paper	Inch	????0.252	?????0.195

Layer)
				MD intensity	????g/3″	????2934	????2750
The MD percentage elongation	????％	????13.2	????7.8
				CD intensity	????g/3″	????1420	????1086
The CD percentage elongation	????％	????8.1	????7.3
				????GMT	????g/3″	????2041	????1728
Basic weight	????g/m 2	????41.3	????50.9
				Absorbability	????G	????2.56	????1.73
Absorbability	G (water)/g (fiber)	????5.86	????3.84

In addition, product of the present invention has higher CD percentage elongation, and so in use it can increase " toughness " to paper towel.As final product, the coil paper that utilizes the present invention to produce has than major diameter (5.3 inches ratios 5.0) and bigger hardness (0.191 to 0.277).Meanwhile, because paper size and number are fixed, the weight of coil paper has reduced 19%.

Example 7

Utilize as example 1 described former and structure, making mixed proportion is that 50: 50 BK bleached kraft northern softwood and the fibre blend of BK bleached kraft eucalyptus form wet web.In this case, machine speed is 2500fpm.Basic weight is near 20 pounds/2880ft ²Final wet web, passing four respectively is respectively the vacuum tank of 19.8,19.8,22.6 and 23.6 inches of mercury.The wet web that finally obtains then transmits through the additional integral sealing dewatering system of also describing in example 1.Set pneumatic shuttle so that at the indoor maintenance 15psig of gas boosting pressure, and before utilizing and back air pressure sample is measured denseness.Expression in result's table 3 below of example 7.

Example 8

This time, except pneumatic shuttle re-constructed into the gas boosting chamber and the integral sealing between the relevant collecting box of cancellation pneumatic shuttle, it repeated the test of example 7.Specifically, make seal load and the therefore collision minimizing of the transverse sealing sheet of generation, till the leakage between pumping chamber and the collecting box obviously.In this, the arrangement sets of pneumatic shuttle gas boosting chamber/collecting box becomes 0.1 inch gap of nominal, although can not the actual space of seeing between pumping chamber and the collecting box, because it is occupied by webbing and wet web.The air-flow of inflow gas pumping chamber is increased to the maximum airflow that can obtain from compressor, and adopt the dehydration denseness sample of back.Expression in result's table 3 below of example 8.

Table 3

Test	Unit	Example 7	Example 8 (Comparative Examples)
				Back dehydration denseness	????％	?????34.2	?????32.1
Preceding dehydration denseness	????％	?????26.8	?????26.8
				The moisture of sloughing	1b. water/1b. fiber	?????0.81	?????0.61

As shown in table 3, any reduction of integral sealing degree causes the remarkable loss of the water separation capability of pneumatic shuttle.Particularly, when losing integral sealing,, still have near the water below 25% and slough (0.61 pound of/pound ratio 0.81) even the gas boosting chamber still obviously contacts with webbing with collecting box.In back dehydration denseness relevant 2% loss will be transformed into machine speed near 10% reduction, because dry this machine speed that limits is restricted.Wish to carry out this restriction being transformed on the wet press of structure of the present invention.

The test of front attempt to illustrate technique known that use is for example described in the United States Patent (USP) 5,230,776 of Valmet Corporation can getable maximum possible the result.In actual applications, seal the air-spray that dehydration equipment produces owing to the excessive noise that can produce at duration of test with by non-integral, equipment can not be worked as mentioned above.Although do not particularly point out, in actual applications, can consider United States Patent (USP) 5,230, the equipment of describing in 776 is operated under 1 inch or bigger gap condition, and under this condition, dehydration significantly reduces, and will cause bigger air consumption.In fact, this invalid meeting causes more additional-energy to expend and the speed reduction, and therefore this technology is not suitable for business equipment.

Example 9

As described in example 1, when turning round with 2000fpm speed, using mixed proportion is 50: 50 brown paper northern softwood of bleaching and the fibre blend of BK bleached kraft eucalyptus, forms the wet web of 20gsm.Then, use makes wet web vacuum dehydration near 4 vacuum tanks of 18,18,17 and 21 inches vacuum levels respectively.Gather vacuum tank denseness sample.The result represents in table 4.

Example 10

Repeat the test of example 9, but adding steam " blows case " (Devronizer), thereby increase water separation capability.Steam chest and vacuum tank do not have integral sealing, and wish that disclosed device is similar in it and the United States Patent (USP) 5,230,776.Flow to the steam approximate per hour (300 pounds) of Devronizer.And gather the denseness sample, so that determine because additional steam blows the increase that case causes.The result represents in table 4.

Example 11

Repeat the test of example 8, but the integral sealing pneumatic shuttle of example 1 is increased in this technology.Pneumatic shuttle is operated under the vacuum level of the 15psig boost pressure and 17 inches of mercury.And, gather the denseness sample, so that determine because the increase that additional integral sealing pneumatic shuttle causes.The result represents in table 4.

Table 4

Sequence number	Denseness %
		Example 9	????24.2
Example 10	????24.8
		Example 11	????33.3

The data of table 4 clearly illustrate: use the integral sealing pneumatic shuttle to blow case than use steam and bring bigger denseness to increase.Blow case and make denseness increase by 0.6%, and the integral sealing pneumatic shuttle blows at steam and makes on the basis that denseness that case causes increases that denseness is extra to increase by 8.5%.Because wet web has been dewatered to 24.2% denseness (example 9) through four vacuum tanks, therefore, increases enough vacuum and/or steam and blows case so that denseness is brought up to the level that can reach commericially feasible speed, this does not gear to actual circumstances.But, add integral sealing pneumatic shuttle (example 11), the level that denseness is brought up to utilize improved wet pressing to design accessible commercial speed.

Preceding detailed description is for illustrative purposes.Like this, under the prerequisite that does not exceed the spirit and scope of the present invention, the present invention can do many improvement and variation.For example, the alternative or optional characteristic as the part of an example can be used to form other embodiment.In addition, but the part of the parts TYP structure of two names.And, can use different alternative techniques and equipment structure, for example, particularly feedstock production, head box, forming fabric band, fabric conveyer, crease and dry.Therefore, the present invention should not be subjected to the restriction of described specific embodiment, and only should be subjected to the restriction of claims and equivalent scope thereof.

Claims (109)

1, a kind of method of making the cellulose paper web, the step of this method comprises:

(a) water slurry with paper fibre is deposited on first webbing of circulation, to form wet web;

(b) wet web is dewatered to about 10% to about 30% denseness;

(c) wet web is sent to second webbing of circulation;

(d) wet web is clipped between second webbing and the supports fabrics band, and adopt non-extruding dewater unit that wet web is dewatered to denseness greater than 30%, because this non-extruding dewater unit and wet web form integral sealing, so it is fit to make pressure fluid mobile through paper web basically with about 5 pounds/square inch or bigger pressure;

(e) wet web that took off water is pressed against on the dryer surface of heating, so that to small part dry wet paper web; With

(f) make the wet web that took off water be dried to final drying.

2, a kind of method of making cellulosic fabric, this method comprises the steps:

(a) water slurry with paper fibre is deposited on first webbing of circulation, to form wet web, wherein this wet web;

(b) wet web is sent to second webbing of circulation;

(c) wet web is clipped between second webbing and the supports fabrics band, and wet web is dewatered to denseness up to about 30%;

(d) use pneumatic shuttle that wet web is replenished and be dewatered to about 30% to about 40% denseness, owing to form whole sealing between gas boosting chamber and gathering-device, so this pneumatic shuttle is fit to make pressure fluid to see through fabric basically with about 5 pounds/square inch or bigger pressure to flow;

(e) second webbing is configured to like this: the wet web that took off water is spent less than 90 around the not supported paper cornerite of pressure roller;

(f) wet web that took off water is pressed against on the dryer surface of heating, so that the dry at least in part wet web that took off water; With

(g) make the wet web that took off water be dried to final drying.

3, a kind of method of making cellulosic fabric, this method comprises the steps:

(a) water slurry with paper fibre is deposited on first webbing of circulation, to form wet web;

(b) wet web is dewatered to denseness up to about 10%;

(c) wet web is sent to second webbing of circulation;

(d) wet web is clipped between second webbing and the supports fabrics band;

(e) by second webbing between wet web and gathering-device, make the wet web that is clipped between second webbing and the supports fabrics band by between gas boosting chamber and the gathering-device, this gas boosting chamber and gathering-device operatively associate, and be applicable to produce pass wet web, about 30 inches of mercury or bigger pressure reduction and pass wet web, about per square inch 10 standard cubic foots of per minute or bigger flow of pressurized fluid;

(f) use flow of pressurized fluid wet web to be dewatered to about 30% to about 40% denseness;

(g) by second fabric paper web that took off water is pressed against on the dryer surface of heating; With

(h) make the wet web that took off water be dried to final drying.

4, the method for claim 1 is characterized in that, non-extruding dewater unit improves about 5% to about 20% with the denseness of wet web.

5, method as claimed in claim 2 is characterized in that, this wet web is replenished be dewatered to about 32% or higher denseness.

6, method as claimed in claim 5 is characterized in that, this wet web is replenished be dewatered to about 34% or higher denseness.

As claim 1,2 or 3 described methods, it is characterized in that 7, the pressure reduction that crosses wet web is about 30 inches of mercury or bigger.

8, method as claimed in claim 7 is characterized in that, the pressure reduction that crosses wet web is that about 35 inches of mercury are to about 60 inches of mercury.

9, as claim 1,2 or 3 described methods, it is characterized in that, pressure fluid is pressurized to about 5 to about 30 pounds of/square inch pressure.

10, as claim 1,2 or 3 described methods, it is characterized in that this gathering-device is made of vacuum tank, this vacuum tank is pumped into greater than 0 vacuum to about 25 inches of mercury.

As claim 2 or 3 described methods, it is characterized in that 11, the holdup time in pneumatic shuttle is about 10 milliseconds or still less.

12, method as claimed in claim 11 is characterized in that, the holdup time in pneumatic shuttle is about 7.5 milliseconds or still less.

As claim 2 or 3 described methods, it is characterized in that 13, wet web advances with about 1000 feet per minute clocks or faster speed, and leave this pneumatic shuttle from entering into, the denseness of wet web increases about 5% or more.

As claim 2 or 3 described methods, it is characterized in that 14, wet web advances with about 2000 feet per minute clocks or faster speed, and leave this pneumatic shuttle from entering into, the denseness of wet web increases about 5% or more.

15, method as claimed in claim 1 or 2 is characterized in that, wet web advances with about 2000 feet per minute clocks or faster speed.

As claim 2 or 3 described methods, it is characterized in that 16, about 85% or the more pressure fluid of supplying with this gas boosting chamber pass this wet web and flow.

17, method as claimed in claim 16 is characterized in that, about 90% or the more pressure fluid of supplying with this gas boosting chamber pass this wet web and flow.

As claim 1,2 or 3 described methods, it is characterized in that 18, the temperature of pressure fluid is 300 ℃ or lower approximately Celsius.

19, method as claimed in claim 18 is characterized in that, the temperature of pressure fluid is 150 ℃ or lower approximately Celsius.

20, as claim 2 or 3 described methods, it is characterized in that heated drying cylinder comprises the drier hood, before wet web entered the drier hood, this second webbing and the drier hood that are pressed against on this drying cylinder separated.

As claim 2 or 3 described methods, it is characterized in that 21, this second webbing that is pressed against on this drying cylinder is wrapped on the drying cylinder, whole distances that it keeps in touch less than this paper web and drying cylinder.

22, as claim 1,2 or 3 described methods, it is characterized in that the wet web that uses a pair of transfer roller will take off water is sent on the heated drying cylinder, this twines the extension that transfer roller forms predetermined span.

23, method as claimed in claim 22 is characterized in that, these two transfer rollers or one of them do not load heated drying cylinder.

24, method as claimed in claim 22 is characterized in that, these two transfer rollers or one of them lean against on the heated drying cylinder and load.

25, method as claimed in claim 1 or 2 is characterized in that, with about 350 pounds/linear inch or littler pressure the wet web that took off water is pressed against on the drying cylinder.

26, as claim 2 or 3 described methods, it is characterized in that, antitack agent is added on second webbing, and this second webbing is pressed against on the heated drying cylinder, so that took off the transmission of the wet web of water.

27, method as claimed in claim 1 or 2 is characterized in that, the wet web that will take off water that flows of pressure fluid is sent to second webbing.

28, method as claimed in claim 1 or 2 is characterized in that, the wet web that will take off water is sent to second webbing fast.

29, as claim 2 or 3 described methods, it is characterized in that, the paper web of drying is not removed from heated drying cylinder with not creasing.

As claim 1,2 or 3 described methods, it is characterized in that 30, the wet web that will take off water is dried to about 95% denseness or bigger denseness, creases then.

As claim 1,2 or 3 described methods, it is characterized in that 31, the wet web that will take off water on the surface of heated drying cylinder partly is dried to from about denseness of 40% to 80%, wet creasing, and finally be dried to about 95% or bigger denseness afterwards.

32, adopt claim 1,2 or 3 described methods to make absorbent tissue-towel.

33, method as claimed in claim 1 or 2 is characterized in that, further comprises: before using non-squeezing dehydration device, this wet web is sent to second webbing, and this wet web is clipped between second webbing and the supports fabrics band.

As claim 1,2 or 3 described methods, it is characterized in that 34, this device is that paper napkin machine is made in improved wet pressing.

As claim 1,2 or 3 described methods, it is characterized in that 35, this second webbing has replaced in traditional wet pressing makes woollen blanket on the paper napkin machine.

As claim 1,2 or 3 described methods, it is characterized in that 36, this gas boosting chamber is positioned at the loop of second webbing of circulation.

37, method as claimed in claim 1 or 2 is characterized in that, this gas boosting chamber is positioned at the loop of supports fabrics band.

As claim 1,2 or 3 described methods, it is characterized in that 38, before the wet web that took off water was sent to heated drying cylinder, the wet web that the vacuum slide rail will take off water was sent on second webbing.

As claim 1,2 or 3 described methods, it is characterized in that 39, first webbing is the forming fabric band.

As claim 1,2 or 3 described methods, it is characterized in that 40, second webbing is molded webbing.

As claim 1,2 or 3 described methods, it is characterized in that 41, this gas boosting chamber is positioned at the press sections that paper napkin machine is made in improved wet pressing.

42, as claim 1 or 3 described methods, it is characterized in that, further comprise: second webbing is configured to like this, that is: make the wet web that took off water around the cornerite that does not support paper of pressure roller for less than 90 °.

43, method as claimed in claim 2 is characterized in that, the wet web that took off water around the cornerite that does not support paper of pressure roller for less than 45 °.

44, method as claimed in claim 42 is characterized in that, the wet web that took off water around the cornerite that does not support paper of pressure roller for less than 45 °.

45, method as claimed in claim 2 is characterized in that, the wet web that took off water around the cornerite that does not support paper of pressure roller for less than 10 °.

46, method as claimed in claim 42 is characterized in that, the wet web that took off water around the cornerite that does not support paper of pressure roller for less than 10 °.

47, the method for claim 1 is characterized in that, non-extruding dewater unit is made up of gas boosting chamber and gathering-device.

48, as claim 2,3 or 47 described methods, it is characterized in that, further comprise: the transverse sealing positioning parts is become to make the course of wet web, first and second webbings towards the gathering-device deflection.

49, method as claimed in claim 48 is characterized in that, the minimum impact momentum h (min) that the collision of transverse sealing parts enters in this supporting fabrics band is determined by following equation: $h\left(\min \right)=\frac{T}{W}(\cosh \left(\frac{\mathrm{Wd}}{T}\right)-1);$

Wherein, T is to be the tension force of first and second webbings of measuring of unit with pound/inch; W is to be the pressure reduction that crosses paper web that unit measures with pound/square inch; D is vertical gap of going up between diaphragm seal and the gathering-device of measuring with inch unit.

50, improving one's methods of a kind of conventional wet press with at least one woollen blanket and squeeze dehydration unit, this method comprises:

(a) replace at least one woollen blanket with at least one webbing;

(b) replace squeeze dehydration unit with extruding dewater unit non-heat, non-.

51, method as claimed in claim 50 is characterized in that, this webbing comes free first webbing, second webbing, supports fabrics band and their group in conjunction with formation.

52, method as claimed in claim 50 is characterized in that, replaces at least two woollen blankets with first webbing and second webbing.

53, method as claimed in claim 50 is characterized in that, replaces at least two woollen blankets with first webbing and supports fabrics band.

54, method as claimed in claim 50 is characterized in that, replaces at least two woollen blankets with second webbing and supports fabrics band.

55, method as claimed in claim 50 is characterized in that, replaces at least two woollen blankets with first webbing and supports fabrics band.

56, method as claimed in claim 50 is characterized in that, the non-extruding dewater unit of non-heat is selected from following group: the non-extruding pressure roller of vacuum tank, pneumatic shuttle, non-heat, perhaps their combination.

57, a kind of method of making the cellulose paper web, this method comprises the steps:

(a) water slurry of paper fibre is deposited between second webbing of first webbing of circulation and circulation to form wet web, wherein wet web is clipped between first webbing and second webbing;

(b) use non-extruding dewater unit that wet web is dewatered to about 30% or bigger denseness, because this non-extruding dewater unit and wet web form integral sealing, so that it is suitable for making the pressure fluid of about 5 pounds/square inch or bigger pressure to pass this wet web basically is mobile;

(c) wet web that will take off water is pressed against on the surface of heated drying cylinder, thus the dry at least in part wet web that took off water;

(d) make the wet web that took off water be dried to final drying.

58, a kind of method of making the cellulose paper web, this method comprises the steps:

(a) water slurry of paper fibre is deposited between second webbing of first webbing of circulation and circulation to form wet web, wherein wet web is clipped between first webbing and second webbing;

(b) wet web is dewatered to about 10% to about 30% denseness;

(c) use pneumatic shuttle that wet web is replenished and be dewatered to about denseness of 30% to 40%, owing between gas boosting chamber and gathering-device, form integral sealing, so this pneumatic shuttle is suitable for making the pressure fluid of about 5 pounds/square inch or bigger pressure to pass this wet web basically and flows, thus make this paper web have about 8 cubic centimetres/gram or bigger bulk density;

(d) wet web that will take off water by webbing is pressed against on the surface of heated drying cylinder, with keep about 8 cubic centimetres/gram or bigger bulk density;

(e) make the wet web that took off water be dried to final drying.

59, a kind of method of making the cellulose paper web, this method comprises the steps:

(a) water slurry of paper fibre is deposited between second webbing of first webbing of circulation and circulation to form wet web, wherein wet web is clipped between first webbing and second webbing;

(b) make the wet web that is clipped between first webbing and second webbing by between pneumatic shuttle and the gathering-device by second webbing, wherein second webbing is between wet web and gathering-device, this pneumatic shuttle and gathering-device operatively associate, and be suitable for producing about 30 inches of mercury of crossing wet web or the more pressure reduction of high pressure and about per square inch 10 scfm or the bigger flow of pressurized fluid of passing wet web;

(c) use flow of pressurized fluid to make this wet web be dewatered to about 30% or higher denseness;

(d) wet web is pressed against on the dryer surface of heating by second webbing; With

(e) make the wet web that took off water be dried to final drying.

60, method as claimed in claim 57 is characterized in that, non-extruding dewater unit can improve the denseness of wet web about 5% to about 20%.

61, method as claimed in claim 58 is characterized in that, wet web is replenished be dewatered to about 32% or higher denseness.

62, method as claimed in claim 61 is characterized in that, wet web is replenished be dewatered to about 34% or higher denseness.

As claim 57,58 or 59 described methods, it is characterized in that 63, the pressure reduction that crosses wet web is about 30 inches of mercury or bigger.

As the described method of claim 63, it is characterized in that 64, the pressure reduction that crosses wet web is about 35 to about 60 inches of mercury or bigger.

65, as claim 57,58 or 59 described methods, it is characterized in that, pressure fluid is pressurized to about 5 to about 30 pounds/square inch pressure.

66, as claim 57 or 58 described methods, it is characterized in that this gathering-device comprises vacuum tank, this vacuum tank is pumped into greater than 0 vacuum to about 25 inches of mercury.

As claim 58 or 59 described methods, it is characterized in that 67, the holdup time in pneumatic shuttle is about 10 milliseconds or still less.

As the described method of claim 67, it is characterized in that 68, the holdup time in pneumatic shuttle is about 7.5 milliseconds or still less.

As claim 58 or 59 described methods, it is characterized in that 69, wet web advances with about 1000 feet per minute clocks or faster speed, and increase about 5% or more from entering into the denseness of leaving this pneumatic shuttle wet web.

As claim 58 or 59 described methods, it is characterized in that 70, wet web advances with about 2000 feet per minute clocks or faster speed, and increase about 5% or more from entering into the denseness of leaving this pneumatic shuttle wet web.

As claim 57 or 58 described methods, it is characterized in that 71, wet web advances with about 2000 feet per minute clocks or faster speed.

As claim 58 or 59 described methods, it is characterized in that 72, about 85% or the more pressure fluid of supplying with this gas boosting chamber pass this wet web and flow.

As the described method of claim 72, it is characterized in that 73, about 90% or the more pressure fluid of supplying with this gas boosting chamber pass this wet web and flow.

As claim 57,58 or 59 described methods, it is characterized in that 74, the temperature of pressure fluid is 300 ℃ or lower approximately Celsius.

As the described method of claim 74, it is characterized in that 75, the temperature of pressure fluid is 150 ℃ or lower approximately Celsius.

76, as claim 58 or 59 described methods, it is characterized in that heated drying cylinder comprises the drier hood, before the wet web that took off water entered the drier hood, this second webbing and the drier hood that are pressed against on this drying cylinder separated.

As claim 58 or 59 described methods, it is characterized in that 77, this second webbing that is pressed against on this drying cylinder is wrapped on the drying cylinder, so that the whole distances that keep in touch less than this paper web and drying cylinder.

78, as claim 57,58 or 59 described methods, it is characterized in that the wet web that uses a pair of transfer roller will take off water is sent on the heated drying cylinder, this twines the extension that transfer roller forms predetermined span.

As the described method of claim 78, it is characterized in that 79, these two transfer rollers or one of them do not load heated drying cylinder.

As the described method of claim 78, it is characterized in that 80, these two transfer rollers or one of them lean against on the heated drying cylinder and load.

As claim 57 or 58 described methods, it is characterized in that 81, the wet web that will take off water with about 350 pounds/linear inch or littler pressure is pressed against on the drying cylinder.

82, as claim 58 or 59 described methods, it is characterized in that, antitack agent is added on second webbing that is pressed against on the heated drying cylinder, so that took off the transmission of the wet web of water.

As claim 57 or 58 described methods, it is characterized in that 83, the wet web that flow of pressurized fluid will be taken off water is sent to second webbing.

84, as claim 58 or 59 described methods, it is characterized in that, will take off the wet web of water and from heated drying cylinder, not remove with not creasing.

As claim 57,58 or 59 described methods, it is characterized in that 85, the wet web that will take off water is dried to about 95% denseness or bigger denseness, creases then.

86, as claim 57,58 or 59 described methods, it is characterized in that, the wet web that will take off water on the surface of heated drying cylinder partly is dried to from about denseness of 40% to 80%, wet creasing, and finally be dried to about 95% or bigger denseness afterwards.

87, adopt claim 57,58 or 59 described methods to make absorbent tissue-towel.

88, as claim 57 or 58 described methods, it is characterized in that, further comprise: before using non-squeezing dehydration device, this wet web is sent to second webbing, and this wet web is clipped between second webbing and the supports fabrics band.

As claim 57,58 or 59 described methods, it is characterized in that 89, this device is that improved crescent former is made paper napkin machine.

As claim 57,58 or 59 described methods, it is characterized in that 90, this second webbing is substituted in crescent former and makes woollen blanket on the paper napkin machine.

As claim 57,58 or 59 described methods, it is characterized in that 91, this gas boosting chamber is positioned at the loop of second webbing of circulation.

92, as claim 57 or 58 described methods, it is characterized in that this gas boosting chamber is positioned at the loop of supports fabrics band.

93, method as claimed in claim 59 is characterized in that, this gas boosting chamber is positioned at the loop of first webbing of circulation.

As claim 57,58 or 59 described methods, it is characterized in that 94, before the wet web that took off water was sent to heated drying cylinder, the wet web that the vacuum slide rail will take off water was sent on second webbing.

As claim 57,58 or 59 described methods, it is characterized in that 95, first webbing is the forming fabric band.

As claim 57,58 or 59 described methods, it is characterized in that 96, second webbing is molded webbing.

97, method as claimed in claim 57 is characterized in that, non-extruding dewater unit is made up of gas boosting chamber and gathering-device.

98, as claim 58,59 or 97 described methods, it is characterized in that, further comprise: the transverse sealing positioning parts is become to make the course of wet web, first and second webbings towards the gathering-device deflection.

As the described method of claim 98, it is characterized in that 99, the minimum impact momentum h (min) that the collision of transverse sealing parts enters in this supporting fabrics band is determined by following equation: $h\left(\min \right)=\frac{T}{W}(\cosh \left(\frac{\mathrm{Wd}}{T}\right)-1);$

Wherein, T is to be the tension force of first and second webbings of measuring of unit with pound/inch; W is to be the pressure reduction that crosses paper web that unit measures with pound/square inch; D is vertical gap of going up between diaphragm seal and the gathering-device of measuring with inch unit.

100, as claim 57,58 or 59 described methods, it is characterized in that, further comprise: second webbing is configured to like this, promptly provide around the cornerite that does not support paper of the wet web that took off water of pressure roller for less than 90 °.

101, as the described method of claim 100, it is characterized in that, around the cornerite that does not support paper of the wet web that took off water of pressure roller for less than 45 °.

102, as the described method of claim 100, around the cornerite that does not support paper of the wet web that took off water of pressure roller for less than 10 °.

103, a kind of traditional crescent former with at least one woollen blanket and squeeze dehydration unit is made improving one's methods of paper napkin machine, and this method comprises:

(a) replace at least one woollen blanket with at least one webbing;

(b) replace squeeze dehydration unit with extruding dewater unit non-heat, non-.

As the described method of claim 103, it is characterized in that 104, this webbing comes free first webbing, second webbing, supports fabrics band and their group in conjunction with formation.

105, as the described method of claim 103, it is characterized in that, replace at least two woollen blankets with first webbing and second webbing.

106, as the described method of claim 103, it is characterized in that, replace at least two woollen blankets with first webbing and supports fabrics band.

107, as the described method of claim 103, it is characterized in that, replace at least two woollen blankets with second webbing and supports fabrics band.

108, as the described method of claim 103, it is characterized in that, replace at least two woollen blankets with first webbing and supports fabrics band.

As the described method of claim 103, it is characterized in that 109, the non-extruding dewater unit of non-heat is selected from following group: the non-extruding pressure roller of vacuum tank, pneumatic shuttle, non-heat, perhaps their combination.

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