CN1125278A - Method of seam closure for sheet transfer and other paper processing belts - Google Patents

Method of seam closure for sheet transfer and other paper processing belts Download PDF

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Publication number
CN1125278A
CN1125278A CN95107322A CN95107322A CN1125278A CN 1125278 A CN1125278 A CN 1125278A CN 95107322 A CN95107322 A CN 95107322A CN 95107322 A CN95107322 A CN 95107322A CN 1125278 A CN1125278 A CN 1125278A
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CN
China
Prior art keywords
band
fibula
seam
paper
resin material
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Granted
Application number
CN95107322A
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Chinese (zh)
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CN1042247C (en
Inventor
L·G·米勒
R·洛蒂-发斯纳特
H·M·库克
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Albany International Corp
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Albany International Corp
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Priority claimed from US08/257,565 external-priority patent/US5601877A/en
Application filed by Albany International Corp filed Critical Albany International Corp
Publication of CN1125278A publication Critical patent/CN1125278A/en
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Publication of CN1042247C publication Critical patent/CN1042247C/en
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/0209Wet presses with extended press nip
    • D21F3/0218Shoe presses
    • D21F3/0227Belts or sleeves therefor
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/0027Screen-cloths
    • D21F1/0054Seams thereof
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00Other details of machines for making continuous webs of paper
    • D21F7/08Felts
    • D21F7/10Seams thereof

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  • Paper (AREA)
  • Decoration By Transfer Pictures (AREA)
  • Lubricants (AREA)
  • Wrappers (AREA)
  • Making Paper Articles (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Cable Accessories (AREA)
  • Ropes Or Cables (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Coating Apparatus (AREA)
  • Package Frames And Binding Bands (AREA)

Abstract

A loop-and-pintle seaming method in a paper-processing belt having a polymeric-resin coating is disclosed.

Description

The sealing method that is used for the page transmission and the seam of the band of other page processing
The present invention is the U.S. Patent application SN08/257 of application on June 9th, 1994, and 565 part continues (CIP).
The present invention relates to a kind of page and handle band, it is used between each one or transmits page thereon between each of the paper machine press section of making as page between each member of same portion squeezes, and perhaps is used for page sent into other operation.Specifically, the present invention relates to one and transmit band, when it was installed on the paper machine, it can connect into the endless form that has a seam; And to so connect have seam to transmit the band coating after, the sealing method of seam region.
At present, have only commercially available this page to handle the transmission band of band.Designed transmission band not only carries page by paper machine part, so that eliminate the open draw by the paper machine; But also easily page is passed to another fabric in the position of some hope or is with.According to definition, so-called open draw be exactly page under the situation that does not have supporting from parts of paper machine by one greater than page the distance of cellulosic fiber lengths be passed to another parts, and page is easy to fracture.Eliminate open draw and mean the main cause of having eliminated irregular shutdown, promptly temporary transient not by the fracture of this position page of woollen blanket or the supporting of other page supporting mass.When the stream at paper pulp send in the process when disturbance takes place, the page that is supported is passed to the another location from a certain position in press section, or at press section last together when squeezing is passed to drying section, such sheet break may frequently take place.In these positions, page contains 59% water usually at least, so paper strength is very low, and is easy to fracture.Obviously, the existence of open draw will be limit the max speed that paper machine can move.
Successful page transmission band is in the effect that must carry out three keys on the paper machine: a) take out page from press fabric not producing under the page instability problem; B) in one or more nips and press fabric co-operate, to guarantee best dehydration and high-quality page; With c) page that page is passed to the following squeezing together of press section or multiple tracks squeezing from the squeezing of press section with the enclosed paper injection receives fabric or is with, or be passed on the dry paper injection fabric of drying section.
That the page transmission band of successfully carrying out these key effects is disclosed in is that on March 29th, 1994 published, in the U.S. Pat 5298124 of exercise question for " transmitting band ", the instruction of this patent is hereby incorporated by.Transmission therein has a surfac topography, it is characterized in that pressure-sensitive and recoverable roughness, therefore, when in nip, squeezing, roughness will reduce, thus, between transmission band and page, formed thin, a continuous moisture film, be with when discharging nip, page is bonded to transmission.When after discharging nip, recovering initial roughness, may be under the help of minimum vacuum, page is passed to permeable fabric such as dry paper injection fabric from transmitting band.
The page transmission band that discloses in that part patent comprises the reinforcement base material that has the paper and the back side, and polymer coating is arranged, and this coating comprises the balanced distribution with at least a polymer segment on paper.This balanced distribution is taked the form of polymer matrix, and described parent not only can comprise hydrophobic but also can comprise hydrophilic polymer segment.Polymer coating also can comprise a kind of filler of particle.This reinforcement base material is designed to prevent and transmits the distortion of band vertical and horizontal, and to strengthen base material can be woven fabric, in the time of on being installed in the paper machine for involution becomes endless form, but can also be for no reason or involution.In addition, strengthen base material and can contain textile material, and the fleeces bed course that can have one or more layers to connect on its back side by acupuncture.The textile material meaning is natural or synthetic fiber and the long filament that is used for making textiles.The back side also can and/or be coated with the polymeric material dipping.
Up to now, this page transmission band of producing for paper plant is an endless form, and just this transmission band has or be woven or with the reinforcement base material that is linked to be endless form before the polymeric material coating with endless form.For no reason the transmission band was both time-consuming yet install on the paper machine, and was very complicated again on the technology.When transmitting the band installation or changing, much less, the production of paper must suspend.Owing to can not therefore must insert by making with circuitous widely different each member that advances and pass and enclose paper winding machine from paper pusher side face.This need be more much more than the installation cost of beginning band time and labour intensity much bigger, this be because mechanism of paper spare as pressure roller when transmitting band and fill in space between them from the side, they must be erected.Need not, provide to reduce widely on the paper machine at the page transmission band of sewing up on the paper machine and install and required time and the labour intensity of tape swapping more.
The open WO93/17161 in the world that discloses International Application PCT/SE93/00173 discloses the attachable band that contains textiles, provides some thermoplastics in one side at least and the segment thickness at least that passes textiles.When thermoplastic, this thermoplastic will fill up the fabric construction of textiles at least in part.There is the connection mesh at the edge at these band two ends, and they are formed in the textiles, and by connecting the acting in conjunction of mesh, will connect similarly in the abutting end that mesh is formed at band, so that form dismountable connection.In order to make band can easily be mounted on the paper machine, and the join domain that provides band has the performance identical with other zone of band, textiles is not added any plastic filler, connecting the meaning is the mesh acting in conjunction that engages the textiles end along a zone, is equivalent to the scope of mesh at least from inside this regional width range that calculates of the ora terminalis of textiles.
It is that to stay what be similar to weft yarn on page be trace to seam region that but the difficulty that provides the transmission band beginning or involution to be produced is provided.Because page transmission band guiding page is by pressed zone, and directly contacts with page in pressed zone, therefore the slightest different of thickness, compressibility and the case hardness of this band seam region all will be left a trace on page.
Therefore, but main purpose of the present invention provides the page transmission band of involution and the sealing method of this seam region, and the performance of the performance of this seam region and these page transmission band other parts is basic identical thus, the result is that this seam region will not left a trace on page.
But another object of the present invention provides the page transmission band of involution, and the result is, reduced on the paper machine, install or change such with required time and labor.
But a further object of the present invention provides the page transmission band of involution, can more easily be modified to cause existing paper machine, or be suitable for introducing US5, and the page transmission band shown in 298,124 thus, can be eliminated open draw from the paper machine.
Therefore, the present invention is included in page transmission band after connecting into endless form again on the paper machine, for several sealing methods that the seam region of stitching band is arranged of coating.The objective of the invention is this seam of complete closed, simultaneously, under common nip load, this seam is had and the identical compression performance of being with of other parts.This sealing technique also disperses to concentrate on the crooked pressure at coating connecting line place.This has improved the warp resistance fatigability that connects.
Two kinds of methods are briefly arranged, on non-paper, fill the seam region of ready band with foamed polymer material.If necessary, the paper of band can be with identical or different polymeric material, but not necessarily must fill by foamed plastics.In one approach, utilize the band lamina membranacea and the thermal source of the demoulding medium that is fit to, the foaming compound is foamed and solidify.During heating operation, the foaming compound expands and fills all spaces, comprises the coating connecting line.After the curing, remove heater, and the ornamenting grinding is carried out on the surface of coating, to remove deburring.The geometrical configuration of the chemical of foam and heater lamina membranacea has been determined total compressibility of seam region in nip.
In other method, before being applied to seam region, polymeric material, and is cured by heating as above with its prefoam.
In another approach, can be with the solid foam bar of polymeric resin material, or with the topped seam region of the ribbon of fiber floc pad material.Every kind of bar can be with adhesives to seam region.
In also having another kind of method, the base fabric that the seam band is arranged of coating vertically can comprise the multiply yarn at it.During the preprocessing of seam, the multiply yarn that can cut off is listed in the paper place that seam band is arranged away from coating side by side, forming bat wool below seam, thereby substitutes the wadding heat that lacks in seam region.Then on the paper machine, carry out the involution operation, for example utilize spray adhesive the multiply yarn can be fixed on suitable position.
The band of coating can have a structure, and thus, endless loop is located in the centre of the structure below coating, on bottom; The band of coating can comprise the coating of needle punched fabric, foam of polymers, polymeric resin material of woven fabric, fibrous batts material or other non-woven constructions, than the more not squeezable material of the needle punched fabric of fibrous batts material or their any combination.
In addition, can get rid of bottom fully.Can utilize polymeric material preferably not foam, room-temperature-curable or heating can rapider curing the surface (paper) crossed of material involution coating.
More particularly, the page that is used for polymer resin coating is handled method of the present invention that the band seam sews up and is comprised the papermaking fabric that pin can be sewed up with fibula and connect into endless form, and with the outer surface (paper) of polymeric resin material coated textiles.Then solidify polymeric resin material, and carry out non-imposed surface finish, take out fibula, on seam, cut polymeric resin material, make the fabric of coating just now become the beginning form.Then this band is delivered to the paper mill,, it is connected into endless form again with fibula on the paper machine between installation period.Then, just go up topped seam with the encapsulating material of seam region at the uncoated face of band at inner surface (non-paper).Encapsulating material can be the viscosity slurry that comprises polymeric material and blowing agent.Gradually heat the temperature of seam then, thereby discharge gas, and form foam by the viscosity slurry to the blowing agent degraded.The space of this foam-filled seam, and the joint-cutting that forms can be passed in coating material and be cut open the time.And then the heating seam is to the solidification temperature of foam.It is closed that curing can make joint-cutting be bonded into, and perhaps available independent material is bonded into closed.
In addition, encapsulating material can be the prefoam polymeric material, wherein uses to the seam region at it, and this polymeric material is foamed.Prefoam can be finished by using in room temperature or near the blowing agent that room temperature takes place to degrade.The low density filler that comprises the thermoplastic microspheres of expansion can be used for substituting blowing agent.In case the polymeric material of prefoam is applied to seam region, just as above be cured, obtain identical result.
The ribbon that can use the solid foam bar of polymeric material or fibrous wadding hot material replaces the liquid envelope material as encapsulating material.Bar in both cases can be by adhesive to seam region, and that joint-cutting can utilize independent material to be bonded into is closed.
In addition, the base fabric that the seam band is arranged of coating vertically can include the multiply yarn at it.Can cut off the multiply yarn, and be arranged in seam below, forming bat wool there, thereby substitute the batts material that lacks.Can for example utilize spray adhesive that this bat wool is fixing in position.
The present invention also comprises the band that makes according to these methods.Although focus on the seam of page transmission band in the argumentation below, the present invention also can be applied to long nip press (LNP) or any other is used for the seam of the polymer-coated band of paper industry.
The invention enables compressibility,, or make the vestige that stays on the page in the nip reduce to minimum at least with the vestige that stays on the page in the elimination nip to those of skill in the art's energy control joint of machine clothing.Another advantage of the present invention be in seam region with the bottom surface on the distribution of foam or other material reduced the stress of coating junction.At last, coating being connected sealing can prevent from owing to the layering of coating the water of band to be permeated and possible too early damage.This band can also alleviate the vestige of the page that the connecting line by coating causes.
With reference to the accompanying drawing of often making of representing below, the present invention will be described in more detail.
Fig. 1 is illustrated in and eliminates open draw in the paper machine, comprises the representational squeezing layout of transmitting band.
Fig. 2 is illustrated in the page of a certain moment polymer resin coating of its manufacture process and handles the cross-sectional view of being with.
The page of polymer resin coating constantly subsequently that Fig. 3 is illustrated in during its manufacturing is handled the cross-sectional view of being with.
Fig. 4 illustrates a method, by this method, and after the page of polymer resin coating handled band being installed on the paper machine, can the involution seam, Fig. 4 is the cross-sectional view of band at that time.
Fig. 5 represents according to replacement embodiment of the present invention and the plane of the transmission band seam region of involution.
Fig. 6 is the side cross-sectional view of getting Fig. 5 line 6-6 '.
Fig. 7 represents to be used for a kind of replacement method of involution seam.
Fig. 8 represents the method for another kind of involution seam.
Fig. 9 represents the method for another involution seam.
Figure 10 represents the mutation of method shown in Figure 9.
Arrange in order common background technology to be described, to figure 1 illustrates the representational squeezing that is included in the transmission band of eliminating open draw in the paper machine.Arrow among Fig. 1 is represented the motion or the rotation direction of the parts shown in it.
In Fig. 1, the page 10 that is illustrated by the broken lines begins to move right below paper injection fabric 12, invites page 10 on the forming fabric that this paper injection fabric 12 always draws in advance.
Page 10 and paper injection fabric 12 advance towards the first vacuum delivery paper bowl 14, and page is around the transfer roller traction and facing to press fabric 16.Swabbing action in the first vacuum delivery paper bowl 14 is taken off page 10 and move on the press fabric 16 from paper injection fabric 12.Paper injection fabric 12 advances forward and around first corrector roll 18 from this transfer position then, and is back to the position that can receive page 10 once more from forming fabric by unillustrated auxiliary corrector roll.
Then, the page 10 that is carried by press fabric 16 advances towards the nip that forms between first pressure roller 22 and second pressure roller 24.As advising like that at the dotted line in the circle of expression second pressure roller 24 among Fig. 1 it can be to be with rill, to be provided in the nip 20 container of the water of removing from page 10.Transmission is with 26 around 22 motions of first pressure roller, and guides together by nip 20 with page 10 and press fabric 16.In nip 20, compression page 10 between press fabric 16 and transmission are with 26.
When nip 20 comes out, page 10 is bonded to the more smooth transmission of its surface ratio press fabric 16 with on 26 the surface, and the right from nip 20 towards figure moves on, and page 10 and transmission are with 26 to arrive the second vacuum delivery paper bowl 28.By second corrector roll, 30, the three corrector rolls 32 and the 4th corrector roll 34 guiding press fabrics 16, and be back to the first vacuum delivery paper bowl 14, press fabric 16 can receive the page 10 from paper injection fabric 12 once more there.At the second vacuum delivery paper bowl, 28 places, page 10 is passed near the dry fabric 36 of guiding the transfer roller.Dry fabric 36 carries page 10 and advances towards first drying cylinder of drying section.
Transmission is advanced to the right of figure away from the second vacuum delivery paper bowl 28 with 26, reach the 5th corrector roll 40, be led to the 6th corrector roll around this roller transmission band, the 7th corrector roll, the 8th corrector roll and the 9th corrector roll, finally be back to first pressure roller 22 and nip 20, transmitting band there can receive once more from the page of press fabric 16.
As Fig. 1 as can be seen, transmission has also been eliminated in the open draw shown in this squeezing layout with 26, particularly often appears at page 10 is passed to dry fabric 36 from press fabric 16 open draw.In all positions that page is arranged by squeezing shown in Figure 1, it is all supported by supporting mass.In addition, should also be noted that owing to be enough to hold page 10 that therefore, when nip 20 is discharged, page 10 is loaded in and transmits with below 26 at the moisture film of transmission on 26.
In order to produce the seam transmission band that has of the present invention, should set about obtaining various OMS (on the paper machine, can sew up) coated substrate, and it temporarily can be connected into endless form, so the inner surface of the endless loop that forms is the non-paper of transmission band.The view of the seam region of press fabric is included among Fig. 2 like this.
Now particularly with reference to figure 2, the suture ring 54 that the vertical yarn 56 that has the seam region 50 of seam OMS coated substrate 52 to be included in the widthwise edges place of beginning press fabric 52 forms.In the time such coated substrate 52 will being closed into endless form, two ends are flocked together, interlaced with each other forming path 58 at the suture ring 54 at two ends, and fibula 60 is passed path 58 so that suture ring 54 is locked together.As shown in Figure 2, fibula 60 can be a thick monofilament.In addition, fibula 60 can also be multifilament fibula or plied monofilament fibula.
Fig. 2 shows a kind of operable coated substrate 52.This coated substrate 52 comprises crosswise yam 62 and sews up by interweave fibrous batts material 64 in the base fabric 62 that forms of vertical yarn 56 and crosswise yam 62.In addition, except that fibrous batts material 64, the bottom of coated substrate 52 can also comprise, woven fabric, polymeric foam, the coating of polymeric resin material, with the identical or different material of material that uses on the paper of coated substrate 52, or other non-woven structure, than the more not squeezable material of the fabric of the fibrous batts material of making, or their any combination.The more not squeezable material of the fabric of the fibrous batts material that used ratio is made is to make the more squeezable substitute of seam, to obtain similar performance between seam region and page transmission band other parts.
In addition, can fully phase out bottom.In this case, when coating have seam band to be installed on the paper machine time, the surface of coating (paper) application of polymeric materials, the material involution that does not preferably foam; Described material can be in cold curing, or can rapider curing under heating.
As mentioned above, on the proper device of production plant, coated substrate 52 is temporarily connected into endless form, so the outer surface of the endless loop that forms is for transmitting the paper of band, the result is, this band can be placed being similar under the longitudinal tension force that supports when it moves on the paper machine.
Under such condition, use polymer coating 68 to be coated with the outer surface of the closed hoop that forms by coated substrate 52, this coating comprises the balanced distribution of the segment of at least a polymer, can comprise hydrophobic and the polymer matrix hydrophilic polymer segment thereby form.This polymer coating 68 can also comprise as at US5, disclosed granular filler 70 in 298,124.
Solidified coating 68 and grinding is with 72 to provide to transmit then, and this band includes seam region 50, has the surfac topography of homogeneous thickness and hope.
At this moment,, and can not produce any damage to it if the length and the width that transmit with 72 allow, can be with this band upset (the inside is changed into the outside).In addition, if the device that can provide the workman in closed hoop, to operate, and do not damage to transmit and be with 72, so, then the operation that will describe can carried out with the 72 closed hoop inside that form by transmission.
Under the two situation, as shown in Figure 3, all take out fibula 60, and folding the transmission is with 72 at seam region 50 places.That is to say, be in folding transmission of the such mode in folding the inside with coating 68 and be with 72.Folding effect is to take out suture ring 54 from staggered state, and makes it to become the suture ring 54 that is arranged in parallel with a determining deviation as two settings that will be described.Be the part 74 of coating 68 between two parallel suture rings, cut this part 74, thereby under to the situation of suture ring 54, make transmission be with 72 to be back to the beginning form without any damage by between two parallel suture rings 54, using sharpener.
Transmit in this state packing at beginning and to be with 72, and deliver to paper plant and be installed on the paper machine, for example can be as shown in Figure 1, install in the mode identical with the OMS press fabric.Here will be pointed out that once more, and transmit band among Fig. 1 and represent with reference number 26.
Now, return Fig. 1, the transmission that can sew up is with 72 to be installed on the paper machine, rather than has the transmission for no reason that is coated with face 68 towards outer polymer and be with 26.Can use than the more pliable and tougher yarn of thick monofilament fibula 60 as final fibula.Still need guarantee seam region 50 now, specifically make the 74 pairs of pages of on the paper machine, making 10 of part that transmit the polymer coating 68 that cuts with 72 beginnings not produce vestige.
With reference to figure 4, when fibula 76 is used for being with 72 to connect into endless form on the paper machine transmission, can sews up and transmit with the shown therein state of 72 seam region.Joint-cutting 78 is in the polymer coating 68 directly over being close to of suture ring 54, and less important is, in the fibrous batts 64 of crackle 80 under suture ring 54.The combination of ring and fibula makes seaming zone 50 slightly different with 72 other parts with the transmission that can sew up, and has produced a kind of possibility, and that is exactly that seaming zone 50 may make the page that will contact with it produce mark.
Fibula 76 can be thick monofilament fibula, multifilament fibula, plied multifilament fibula, plied monofilament fibula or the compound fibula that comprises these fibulas.
By liquid polymeric resin material and blowing agent being mixed forming the poly-material of viscosity, and heating and solidify the foam that this viscosity slurry produced and be used for filling and adhesive joints district 50 and joint-cutting 78.Solvent-free urethane composition as the Adiprene L-100 of Uniroya1, or can be used for this purpose based on the composition of polyether-type prepolymer.Be the example that can be used for the no-solvent polyurethane composition of this purpose below.
Component weight (%)
Polyethers/toluene di-isocyanate (T (TDI) polyurethane prepolymer (4.1%NCO) 76.9
The arylamine that is obstructed (equivalent-217) 15.4
Heat absorption nucleating agent (blowing agent) 7.7
In addition, can add as filler other components such as plasticizer and catalyst if necessary.With the time degraded of being heated to characteristic temperature almost being that the blowing agent that is generally solid particulate materials of instantaneous relase gas mixes with the liquid polymeric resin material.Activity when the activity of blowing agent is usually less than the polymeric resin material solidification temperature under this temperature.For example, the temperature during blowing agent degraded (or foaming) can be 115 ℃, and the temperature of polymeric resin material when solidifying can be 130 ℃; This is corresponding temperature for Adiprene L-100.Blowing agent makes the foaming of viscosity slurry, and expands, and fills up the space of seaming zone 50, even can pass joint-cutting 78.By this way, joint-cutting 78 can be bonded together, and the compressibility that can make seaming zone 50 and thickness and transmission are identical with 72 remainder.
The viscosity slurry that produces foam 82 preferably at first is applied on the non-paper or the inside of transmission with 72 seaming zones 50 in a certain moment on the approaching easily paper machine of the workman of paper plant.For example, the near zone that is included in the 7th corrector roll 44 among Fig. 1 can provide this approaching easily.Preferably regulate like this viscosity of the viscosity slurry that produces foam 82, can easily apply, and have nothing to do with the orientation of wanting coating surface (laterally, vertical direction, last is inferior) to cause it.
Preferably the viscosity slurry is applied at a certain distance in the seam both sides on the seam of transmitting with 72 non-paper, as 0.25 cun (0.64cm), can be to cause across seaming zone 50 distribution bending stresses, rather than concentrate on joint-cutting 78 places.
In case with the viscosity slurry topped after can sewing up the seaming zone 50 that transmits with 72 non-papers, can with the not bonding with it material of the foam 82 (being obtained by the viscosity slurry) of curing 84 is topped should the zone.Material 84 for example can be heat-resisting separate paper, the glass fiber tape of polytetrafluoroethylene (PTFE) coating and other material.
In addition, also can be coated with and can sew up the paper surface of transmitting with 72 seaming zones 50 with the viscosity slurry that produces foam 82, perhaps also can be with other polymerization coating material, as the material that is used to provide coating 68 is coated with, to fill up any crack in the joint-cutting 78.Similarly, in case by this dual mode be coated with can sew up the seaming zone 50 that transmits with 72 papers after, can be regional with the not bonding with it material 84 topped examinations of the foam 82 (obtaining) that solidifies or other polymerization coating material by the viscosity slurry.
Can use thermal source to make the foaming of viscosity slurry, and cured foam 82.For example, fire-bar 86 can be made by aluminium sheet, and the thickness of this aluminium sheet is generally 0.5 inch, and its width is enough to the seaming zone 50 of complete topped transmission tape running direction.Fire-bar 86 includes a heating element heater, whereby, and the temperature that fire-bar can be when room temperature rises to foam curing gradually and be higher than this temperature.
Two fire-bars 86 are compressed facing to the both sides of seaming zone 50, identical with the thickness that causes seaming zone 50 with the remainder that transmits with 72.Make fire-bar rise to blowing temperature at this device from room temperature, under this temperature, be included in the blowing agent degraded in the viscosity slurry, and slurry is foamed, force slurry to enter in the space of seaming zone 50, on this blowing temperature, continue to be heated to the solidification temperature of polymeric resin material, almost can instantaneously solidify at this material of this temperature.The preferred time that keeps this solidification temperature to be enough to guarantee to finish the examination solidification process for one.
Substitute two fire-bars 86 that use as mentioned above, the slide plate 100 that can draw heating is by seaming zone 50.As Fig. 5, across transmission with 72 width along seaming zone 50, being included in the blowing agent degraded in the viscosity slurry and making the slurry foaming forcing slurry to enter the space of seaming zone 50, and reach the solidification temperature of polymer resin and keep one section speed traction heating slide plate 100 that is enough to guarantee finish the time of solidification process.In this process, below seaming zone 50, preferably support, can compress seaming zone 50 to cause heating slide plate 100, can be identical with 72 remainder with the thickness that guarantees seaming zone 50 with transmission.
Fig. 6 is the side cross-sectional view of getting Fig. 5 line 6-6 '.Be with 72 along seaming zone 50 traction heating slide plates by a rope across transmission.Although the tension force that transmits with 72 can provide enough supportings to slide plate 100,, supporting mass 104 can be set below seaming zone 50, can compress facing to seaming zone 50 to cause heating slide plate 100.
Can use in room temperature to have the very viscosity slurry of long pot life, with cause across transmission with on seam also not exclusively be that this slurry can use step by step along seam under the situation of transversal thing.Long pot life makes slurry can keep changing for a long time and not its performance.If slurry has long working life, fire-bar 86 does not just need as transmission is with 72 wide, and it can heat slide plate 100 as using as mentioned above, use step by step along seam, thereby according to method of the present invention with the seam involution.
After the curing, remove the non-paper that is applied to seaming zone 50 and/or any material 84 of paper, and can make and transmit the band motion, so that seaming zone 50 is on the roller as Fig. 1 the 7th corrector roll 44.At this place, the sand milling by gently makes polymer coated 68 surface smoothing to remove any joint filler that protrudes in seam region.
In addition, can use other material to make joint-cutting bonding.Be the example that can be used as the prescription of other material below:
Component weight (%)
Polyethers/TDI polyurethane prepolymer (4.1%NCO) 76.9
The arylamine that is obstructed (equivalent-217) 15.4
Kaolin 7.7
As using the viscosity slurry mix with blowing agent by the liquid polymeric resin material as mentioned above and to obtain and this viscosity slurry being added to the replacement schemes that seaming zone 50 then forms foam 82, can substitute the viscosity slurry with the liquid polymeric resin material of prefoam.The meaning of " prefoam " is to be foamed before this material adds to seaming zone 50.This foaming can be finished by use the heat absorption nucleating agent (blowing agent) of degrading near room temperature or room temperature.These blowing agents be for those of ordinary skills obtain easily and know.
In the example of the no-solvent polyurethane composition that is used for filling above-mentioned seaming zone 50, can substitute such blowing agent with low density filler.Concrete low density filler is the thermoplastic microspheres shape of hydrocarbonaceous liquid.By these microballoons of heating while puffing, and they still keep expanded attitude when cooling.Even after expanded, they are still very small, and diameter is about one micron, and density is very low.Use various low-density fillers, make the professional can control the density that is applied to the seaming zone foam exactly.That is to say, can microballoon be added in this mixture, till the density value that reaches hope gradually.The example of such low density filler has ExpancelDE 551, and this product is used for the pre-expanded thermoplasticity hollow microsphere of " prefoam " polymeric material of topped seam and forms by being added into.
As another replacement scheme, as shown in Figure 7, can on seaming zone 50, apply solid foam bar 88.This solid foam bar 88 can be made by aforesaid what is called " prefoam " liquid polymeric resin material, or is made by the liquid polymeric resin material that comprises low density filler (microballoon).Solid foam bar 88 can be thermoplastic or heat cured, and this depends on the interactional mode of the end group of the curing agent that is included in the liquid polymeric resin material and polymer chain.When bar 88 is thermoplasticity, can it be bonded on the seaming zone 50 by thermal source such as fire-bar 86.In addition, can also bar 88 be bonded to seaming zone 50 by the adhesive that is used for bonding joint-cutting 78 as mentioned above; Adhesive can add on the bar 88 in advance.When bar 88 is thermosetting, can it be bonded to seaming zone 50 by the adhesive that is used for bonding joint-cutting 78 as mentioned above.At last, no matter be thermoplastic or heat cured, bar 88 can have the adhesive of the thermal activation that is bonded to seaming zone 50.Can be used for this purpose heat-activatable adhesive example for add as solvent cement and be anhydrous thermoplastic polyurethane (for example Estane resin).
As another kind of replacement scheme, as shown in Figure 8, the ribbon 90 of fibrous batts material can be substituted solid foam bars 88 and be bonded on the seaming zone 50.Adhesive can be the adhesive of bonding as mentioned above joint-cutting 78.
In each method of these alternative methods, the material that all available other material such as above-mentioned example provide comes bonding joint-cutting 78.At any liquid polymeric resin material 82, the solid bar 88 of prefoam or ribbon 90 add to and transmit with before the seaming zone on the non-paper, adhesive layer can be added to joint-cutting 78.
Also have a kind of replacement scheme to be illustrated in Fig. 9 and 10.In this two width of cloth figure, the multiply yarn is machine-direction oriented base fabric 66.This multiply yarn can be a multifilament, the multifilament of staple fibre yarn or distortion.
It should be noted in the fibrous batts material 64 in seaming zone 50 places, a gap 106 is arranged.In the preparation process of seaming zone 50, cut multiply yarn 108, and arrange away from polymer coating 68, below suture ring 54, form bat wool, to substitute the fibrous batts material 64 that in gap 106, lacks.As shown in Figures 9 and 10, multiply yarn 108 can preferably enroll the multiply yarn in the base fabric 66 in weaving process from the one or both sides of seaming zone 50, but they also can for example mend in the tufting process with pin after weaving.
After installing on the paper machine, can utilize that for example to spray quinoline adhesive such as commercially available acrylic acid aerosol adhesive fixing in position with multiply yarn 108.Use polymeric material, preferably also do not have the material of foaming, the joint-cutting 78 in can closed polymer coating 78.Can be used for this purpose at the polymeric material of room-temperature-curable and by heating the material that can quicken its curing.
In all aforesaid embodiment of the present invention, not only can use non-foaming polymeric materials by heating or cold curing, but also the non-foaming polymeric materials that can use general ultraviolet light and solidify by the known mode of those of ordinary skills.
What should understand is that the purpose of each of these replacement schemes mainly is to seal with the tight seam of loops, and the seam of sealing with the compression performance that transmits the band remainder is provided.The method of selecting under any situation about providing all will be the method that the millworker can carry out in the shortest time, and the time that makes installation machine thus rather than be used for papermaking becomes the shortest.
To above-mentioned improvement is conspicuous for those of ordinary skills, and these improvement do not make the present invention exceed the scope of claims.

Claims (61)

1. the page of a polymer resin coating is handled the method for closing of the seam of band, comprises the steps:
The papermaking fabric that provides pin to sew up, described fabric have paper, non-paper and at the suture ring at two widthwise edges places that form seam;
Utilize first fibula, by guide described first fibula pass by described suture ring at described two widthwise edges places determined passage when interlaced with each other, the papermaking fabric that described pin can be sewed up connects into endless form;
The one side of described papermaking fabric is coated with first polymeric resin material;
Solidify described first polymeric resin material, the page that produces described polymer resin coating is handled band;
Take out described first fibula;
Cut first polymeric resin material of described curing at described seam crossing, thereby place described band with the form at beginning;
Described band is installed on the paper machine;
Utilize second fibula, but by guide described second fibula pass by described suture ring at described two widthwise edges places of described pin seamed papermaking fabric determined passage when interlaced with each other, described band is connected into endless form, thus, described first polymeric resin material has the joint-cutting in abutting connection with described suture ring; With
Utilize encapsulating material, topped described seam on uncoated of described band, the compression performance with the other parts of described band is identical basically with the compression performance that causes described seam.
2. the method for claim 1, wherein the step of topped described seam comprises:
The viscosity that comprises second polymeric resin material and blowing agent slurry is provided;
Described viscosity slurry is applied on the described seam;
Make the described blowing agent in described viscosity slurry produce gas, described whereby viscosity slurry can become foam; With
Solidify said foam.
3. the method for claim 1, wherein the step of topped described seam comprises:
The liquid polymeric resin material of the prefoam that comprises second polymeric resin material is provided;
The liquid polymeric resin material of described prefoam is applied on the described seam; With
Solidify the liquid polymeric resin material of described prefoam.
4. method as claimed in claim 3, wherein, before being applied to described liquid polymeric resin material on the described seam, the degraded by the blowing agent that mixes with described second polymeric resin material and by prefoam.
5. method as claimed in claim 3, wherein, before being applied to described liquid polymeric resin material on the described seam, by described second polymeric resin material is mixed with low density filler by prefoam.
6. method as claimed in claim 5, wherein said low density filler comprises expanded thermoplastic microspheres.
7. the method for claim 1, wherein the step of topped described seam comprises:
The solid foam bar of second polymeric resin material is provided; With
Described solid foam bar is bonded on uncoated the described seam of described band.
8. method as claimed in claim 7 is wherein by the bonding described solid foam bar of thermal source.
9. method as claimed in claim 7 is wherein by the bonding described solid foam bar of adhesive.
10. the method for claim 1, wherein the step of topped described seam comprises:
The ribbon of fibrous batts material is provided; With
Described ribbon is bonded on uncoated the described seam of described band.
11. method as claimed in claim 10 is wherein by the bonding described ribbon of adhesive.
12. the papermaking fabric that the method for claim 1, wherein described pin can be sewed up vertically includes the multiply yarn at it; And wherein the step of topped described seam comprises:
On at least one widthwise edges of the papermaking fabric that described pin can be sewed up, cut off described multiply yarn; With
And the two ends of described multiply yarn are arranged on uncoated the described seam of described band.
13. method as claimed in claim 12 wherein is fixed on the described seam by the described two ends of spray adhesive with described multiply yarn.
14. method as claimed in claim 12, wherein said multiply yarn is a multifilament.
15. method as claimed in claim 12, wherein said multiply yarn is a staple fibre yarn.
16. method as claimed in claim 12, wherein said multiply yarn is the multifilament of distortion.
17. the method for claim 1, wherein said first fibula are thick monofilament fibula.
18. the method for claim 1, wherein said first fibula is the multifilament fibula.
19. the method for claim 1, wherein said first fibula is the plied monofilament fibula.
20. the method for claim 1, wherein said second fibula are thick monofilament fibula.
21. the method for claim 1, wherein said second fibula is the multifilament fibula.
22. the method for claim 1, wherein said second fibula is the plied monofilament fibula.
23. the method for claim 1, wherein said second fibula are the compound fibula that comprises thick monofilament fibula.
24. the method for claim 1, wherein said second fibula are the compound fibula that comprises the multifilament fibula.
25. the method for claim 1, wherein said second fibula are the compound fibula that comprises the plied monofilament fibula.
26. the method for claim 1, but wherein said application step on the paper of described pin seamed papermaking fabric, carry out, but but also comprise the step that the non-paper of described pin seamed papermaking fabric and fibrous batts material are sewed up.
27. the method for claim 1, but wherein said application step on the paper of described pin seamed papermaking fabric, carry out, but but also comprise the step that is coated with the described non-paper of said pin seamed papermaking fabric with described first polymeric resin material.
28. the method for claim 1, but wherein said application step on the paper of described pin seamed papermaking fabric, carry out, but but also comprise the step that is coated with the described non-paper of described pin seamed papermaking fabric with the trimerization resin material.
29. the method for claim 1, but wherein said application step is carried out on the paper of described pin seamed papermaking fabric, but but also comprises than the material adhesive of the more difficult compression of sewing up of the fiber material fabric step to the described non-paper of described pin seamed papermaking fabric.
30. the method for claim 1, but wherein said pin seamed papermaking fabric includes vertical yarn, and wherein said suture ring is formed by described vertical yarn.
31. the method for claim 1 also includes the step of grinding described first polymeric resin material behind described curing schedule, so that the paper processing tape thickness of described polymer resin coating is even, and give its desirable surface characteristic.
32. the method for claim 1 after encapsulating material is applied to the step of described seam, also includes the step of topped described encapsulating material.
33. method as claimed in claim 2 also comprises described viscosity slurry is applied on described the described seam of the described band with described first polymeric resin material coating.
34. method as claimed in claim 33 to the step of described seam, also comprises the step of topped described viscosity slurry at the described viscosity slurry that applies.
35. method as claimed in claim 2, wherein when compressing described seam, carry out described described blowing agent step that produces gas and the step of solidifying described foam of making, identical with thickness and/or the compression performance that causes described seam with the other parts of the page processing band of described polymer resin coating.
36. the method for claim 1, the page that also is included in the described polymer resin coating with described first polymeric resin material are handled described of band and are gone up and described seam is carried out frosted handle, so that described seam is level and smooth.
37. method as claimed in claim 2, wherein make described blowing agent produce gas and force described foam to enter in the described joint-cutting of described first polymeric resin material, and the step of solidifying described foam is bonded together described joint-cutting with the step of producing foam according to described viscosity slurry.
38. the method for claim 1, also comprise on two faces that at a certain distance described encapsulating material are applied to described seam with the zone on two faces of topped described seam and seam, the result is, the bending stress of handling in the band at the page of described polymer resin coating can be dispersed in than the wideer zone of described seam of eliminating described joint-cutting bending stress, equals the other parts of this band with the bending resistance in the zone that causes described seam.
39. the method for claim 1 also comprises with the step of the bonding described joint-cutting of trimerization resin material and the step of solidifying described trimerization resin material.
40. method as claimed in claim 39, the page that also is included in the described polymer resin coating with described first polymeric resin material are handled described of band and are gone up and described seam is carried out frosted handle, so that described seam is level and smooth.
41. the page of a polymer resin coating is handled band, contains:
The papermaking fabric that pin can be sewed up, described fabric has the suture ring that is formed by the vertical yarn at two widthwise edges place, and utilize fibula to pass and be connected to endless form with paper and non-paper by the staggered passage of determining of described suture ring, thus, described fibula and suture ring have constituted the seam of described band;
But the coating of first polymeric resin material on the described paper of described pin seamed papermaking fabric, described coating has a joint-cutting at described seam crossing; With
But the encapsulating material of topped described seam on the described non-paper of described pin seamed papermaking fabric.
42. band as claimed in claim 41, but wherein said encapsulating material is for being full of the foamed plastics of second polymeric resin material of described seam from the described non-paper of described pin seamed papermaking fabric.
43. band as claimed in claim 41, wherein said encapsulating material are the solid foam bar of second polymeric resin material, described solid foam bar is bonded on the described seam of non-paper of described band.
44. band as claimed in claim 41, wherein said encapsulating material are the ribbon of fibrous batts material, described ribbon is bonded on the described seam of non-paper of described band.
45. band as claimed in claim 42, wherein said foamed plastics also extends into described joint-cutting, and described joint-cutting involution is become closure state.
46. band as claimed in claim 41, but wherein said pin seamed papermaking fabric is vertically including the multiply yarn; And wherein said encapsulating material includes from the two ends of the described multiply yarn of at least one widthwise edges extension of described fabric, and the joint face of the described non-coated face of topped described band.
47. band as claimed in claim 46, the described two ends of wherein said multiply yarn are fixed on the described seam by spray adhesive.
48. band as claimed in claim 46, wherein said multiply yarn is a multifilament.
49. band as claimed in claim 46, wherein said multiply yarn is a staple fibre yarn.
50. band as claimed in claim 46, wherein said multiply yarn is the multifilament of distortion.
51. band as claimed in claim 41, but also comprise the interior fibrous batts material of described non-paper that sews up described pin seamed papermaking fabric.
Band as claimed in claim 41, but the coating of polymeric resin material on described pin seamed papermaking fabric, also contained.
53. band as claimed in claim 41, but also comprise woven fabric on the non-paper that is connected to described pin seamed papermaking fabric.
54. band as claimed in claim 41, but also comprise polymeric foam plastics on the non-paper that is connected to described pin seamed papermaking fabric.
55. band as claimed in claim 41, but also comprise material than the more difficult compression of serving textile of the fibrous batts material on the non-paper that is connected to described pin seamed papermaking fabric.
56. band as claimed in claim 41, wherein said fibula are the monofilament fibula.
57. band as claimed in claim 41, wherein said fibula is the monofilament fibula of plying.
58. band as claimed in claim 41, wherein said fibula is the multifilament fibula of plying.
59. band as claimed in claim 41, wherein said fibula are the compound fibula that comprises the monofilament fibula.
60. band as claimed in claim 41, wherein said fibula are the compound fibula that comprises the plied monofilament fibula.
61. band as claimed in claim 41, wherein said fibula are the compound fibula that comprises the plied multifilament fibula.
62. band as claimed in claim 41 wherein, becomes closure state with the trimerization resin material that solidifies with described joint-cutting involution.
CN95107322A 1994-06-09 1995-06-09 Method of seam closure for sheet transfer and other paper processing belts Expired - Fee Related CN1042247C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US257,565 1994-06-09
US08/257,565 US5601877A (en) 1994-06-09 1994-06-09 Method of seam closure for sheet transfer and other paper processing belts
US08/428,661 US5789052A (en) 1994-06-09 1995-04-25 Method of seam closure for sheet transfer and other paper processing belts
US428,661 1995-04-25

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CN1125278A true CN1125278A (en) 1996-06-26
CN1042247C CN1042247C (en) 1999-02-24

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JP (1) JP3511148B2 (en)
CN (1) CN1042247C (en)
AT (1) ATE276400T1 (en)
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BR (1) BR9502721A (en)
CA (1) CA2151329C (en)
DE (1) DE69533498T2 (en)
ES (1) ES2227539T3 (en)
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CN1042247C (en) 1999-02-24
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EP0695827B1 (en) 2004-09-15
DE69533498T2 (en) 2005-09-15
EP0695827A2 (en) 1996-02-07
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NO952277D0 (en) 1995-06-08
JP3511148B2 (en) 2004-03-29
FI952507A0 (en) 1995-05-23
JPH0860586A (en) 1996-03-05
FI111175B (en) 2003-06-13
AU2045695A (en) 1995-12-21
AU678899B2 (en) 1997-06-12
NZ272169A (en) 1997-06-24
NO952277L (en) 1995-12-11
CA2151329C (en) 2007-02-06
ATE276400T1 (en) 2004-10-15
NO312372B1 (en) 2002-04-29
BR9502721A (en) 1996-01-16

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