CN101484635A - Papermaking felt - Google Patents
Papermaking felt Download PDFInfo
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- CN101484635A CN101484635A CNA2007800254063A CN200780025406A CN101484635A CN 101484635 A CN101484635 A CN 101484635A CN A2007800254063 A CNA2007800254063 A CN A2007800254063A CN 200780025406 A CN200780025406 A CN 200780025406A CN 101484635 A CN101484635 A CN 101484635A
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Images
Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
- D21F7/083—Multi-layer felts
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- Paper (AREA)
Abstract
A papermaking felt (100) obtained by: superposing two or more bases of the same or different kinds together with a layer of bat fibers comprising core-sheath composite fibers, the bat-fiber layer being disposed on one or each side of each base; and uniting them by entangling through needling. At least one of the bases includes, as warps or wefts, a soft twist yarn comprising core-sheath composite fibers. This felt attains satisfactory water removal and excellent wet-web smoothness. It is satisfactory in compressability by pressing, recovery, and retention of recovery and, in particular, has excellent unsusceptibility to fiber shedding. It is hence suitable for use in high-speed papermaking machines.
Description
Technical field
The present invention relates to be used for the papermaking felt (hereinafter referred to as " felted terxture ") of paper machine, more specifically, relate to the papermaking felt that will be applied in pressure at the pressurised zone of paper machine, to squeeze out the water in the wet web (paper web).
Background technology
The pressurised zone use felted terxture of paper technology squeezes out the water in the wet web.Especially, being used for removing the paper machine that anhydrates from wet web and having three zones, promptly form the zone, anhydrates thereby remove from wet web in papermaking process in pressurised zone and arid region.In each zone, from wet web, remove continuously and anhydrate.The papermaking instrument with water separation capability is used in each zone.
Fig. 5 is the schematic diagram of pressue device.
As shown in Figure 5, pressue device comprises a pair of pressure roller Pa, Pa and a pair of felted terxture 11a, 11a, sandwiches wet web Wa therebetween.When pressure roller Pa, Pa (its constitute supercharging mechanism) exerted pressure to felted terxture 11a, 11a and wet web Wa, water was squeezed out wet web Wa and is absorbed by felted terxture 11a, 11a.
Suction box (suction box) FSB that the water that is absorbed by felted terxture 11a, 11a passes through separately aspirates and discharges.The water that is absorbed by felted terxture is not tangential in the outlet of forcing press on the direction of lower pressure roller Pa and discharges with the liquid SP that splashes.
Each felted terxture has the basic function that a plurality of needs are performed.These functions comprise the water squeeze function so that water is squeezed out wet web, and smoothing function is sent into function to send into wet web with the smoothness and the wet web that increase wet web.Felted terxture must have all these functions evenly.
In these felted terxture functions, following function (water squeeze function) of carrying out water is squeezed out wet web: when wet web and felted terxture through between the pressure roller time, wet web and felted terxture are at pressure lower edge thickness direction by compression.The water that extruding is come out from wet web is transferred to felted terxture.
Discharge at the water back side from felted terxture under pressure that is transferred to felted terxture, perhaps by suction of the suction box of paper machine and discharge felted terxture system.Therefore, importantly have water permeability for felted terxture, and the function of recovering from compressive state during by step-down when felted terxture (be compressed and the ability recovered and continue such ability that is compressed and recovers).
When felted terxture passed through suction box, felted terxture was because friction is worn, and some fibre wherein is tending towards extracting out.Therefore, be to continue above-mentioned functions for the felted terxture key, comprise the function that the opposing fiber shifted out from the starting stage of its use.
Thereby papermaking felt also should have the important function (smoothing function) that is compressed into smooth surface under pressure make wet web level and smooth.
For example Japan's publication announcement in advance No.08-302584 discloses a kind of felted terxture with such function, and it has core-skin (core-in-sheath) structure of being made by bicomponent material.Especially, this bicomponent material comprises having low-melting leather material and have dystectic core material, and it has constituted the yarn of base fabric and the fiber of bat (batt) layer.When the heating felted terxture, the softening matrix that forms in the bat fibrage of leather material, thereby the dehydration and the water discharging performance of raising felted terxture, and strengthen resistance against compression.
Fig. 1 is the sectional view according to the common felted terxture of paper grade (stock) of background technology.The structure of common felted terxture is described hereinafter with reference to Fig. 1.
Papermaking felt 10 is endless structure, it comprise with the base material 20 of woven fabric or similar type and with base material 20 by the punch bat fibrage 30 of whole twisted of acupuncture.
In recent years, along with the service speed of paper machine becomes higher, thereby at the used pressure of the pressurised zone big paper productive rate that improves that becomes, papermaking felt has been used in more and more under the exacting terms.In other words, nearest trend is to improve productive rate towards the paper machine of fair speed in paper technology.
At pressurised zone, increasing roller or shoe press plate (shoe press) can apply higher pressure.Therefore, under high pressure be tending towards being driven plain, thereby reduced its water permeability and its ability that is compressed and recovers at the felted terxture of pressurised zone.
Because paper machine has higher service speed, the bat fiber of felted terxture is tending towards because of rubbing by heavy wear and being moved out of.As a result, be easy to occur various troubles, comprise that irregular paper quality and impressionability lack.
Comprise lasting water extrusion capability for the basic performance requirement of felted terxture, lasting smoothing capability and the anti-fiber that continues shift out ability.Especially, water extrusion capability, smoothing capability and the anti-fiber that requires nearest high speed paper machine to have high sustainable level shifts out ability.
Various structures have been proposed so far as the means that satisfy above-mentioned requirements.For example, proposed to improve the ratio of base material so that the felted terxture water permeable.Shifting to an earlier date publication in Japan announces among the No.2003-13385 and discloses a kind of method that improves the base material ratio.According to the method that proposes, overlapping a plurality of woven fabric for no reason, for example hollow weavy grain (weave) (perhaps having the woven fabric for no reason that the end of the woven fabric of end is arranged (ended) structure makes) by connection.Piled up thereon after the bat fiber, by the whole twisted of needle point method they.
Japan's publication in advance announces that No.08-302584 has disclosed a kind of felted terxture that comprises the bat layer of being made by bicomponent material.The heating felted terxture makes it enter the cross section of bat fiber and base material with the softening low-melting material that is included in the bicomponent material.Thereafter, the sclerosis bicomponent material shows resistance to compression to form matrix thereby this matrix strengthens base material.
Patent document 1: Japan's publication in advance announces No.08-302584
Patent document 2: Japan's publication in advance announces No.2003-13385
But, Japan shift to an earlier date publication announce No.08-302584 and Japan in advance publication announce that the problem of disclosed felted terxture among the No.2003-13385 is that when by pressue device during to their repeated compression, it is subject to the influence of compression fatigue.
In addition, announce that disclosed felted terxture is relatively poor in the pressure lower compression among the No.08-302584, so its smoothing capability and water extrusion capability are poor owing to shift to an earlier date publication in Japan.
Consider that above problem made the present invention.A target of the present invention provides a kind of papermaking felt, it has good water extrusion capability, fabulous wet web smoothing capability, fabulous anti-fiber and shifts out ability, fabulous durability, and its fabulous anti-fiber that has the high-speed papermaking machines of being suitable for especially shifts out ability.
Summary of the invention
As in order to finish the result that above-mentioned target is studied the felted terxture structure, felted terxture according to the present invention comprises two or more base materials that pile up (first base material and second base material).At least one base material is formed by the weak twist warp thread or the weft yarn that comprise core-skin composite fiber.
Described yarn is tending towards flattening easily.The low-melting component of the low-melting component of the fusion of the bat fiber by comprising core-skin composite fiber and the fusion of yarn comes the gap between the closed yarn.Have been found that the felted terxture of structure can be realized above-mentioned target thus.
" gap between the yarn " is meant in the gap in the gap between the row of warp thread or weft yarn (gap between yarn and yarn) and the yarn (gap between the sub-thread (strand) at twisted yarn).
Especially, in papermaking felt according to the present invention, the bat fiber that comprises core-skin composite fiber is stacked on one or two surface of a type or dissimilar two or more base materials, and by needle point method with its whole twisted.
At least one base material is formed by weak twist warp thread that comprises core-skin composite fiber (MD yarn) or weft yarn (CD yarn).
Preferably, in papermaking felt according to the present invention, base material is formed by warp thread and weft yarn, and has end structure is arranged.With rolls around repeatedly becoming the base material that piles up.The weak twist warp thread (MD yarn) or the weft yarn (CD yarn) that comprise the core-skin composite fiber that piles up base material are flat.The low-melting component of the low-melting component of the fusion of the bat fiber by comprising core-skin composite fiber and the fusion of yarn comes the gap between the closed yarn.
Preferably, base material comprises the multilayer woven fabric that is woven at least one double-deck weavy grain.The weak twist warp thread or the weft yarn that comprise the core-skin composite fiber of multilayer woven fabric are flat.The low-melting component of the low-melting component of the fusion of the bat fiber by comprising core-skin composite fiber and the fusion of yarn comes the gap between the closed yarn.
According to the present invention, the warp thread of base material or weft yarn comprise the yarn that contains core-skin composite fiber (preferred soft twist yarn), and are added and be twisted as the long filament (filaments) that fineness is 50 to 400 dtexs (dtex).
In addition, be made into flatly according to the yarn of base material of the present invention, this is because described base material is formed by the yarn of certain fineness.Use soft twist yarn can more effectively allow it become more flat.Soft twist yarn has 30 to 100 the final twist for every meter, and the number of the initial twist is 1.2 to 1.4 with the ratio of the number of the final twist.
Because twisted yarn is a soft twist yarn, twisted yarn is easy to make in base material flat, so it has the function that increases the base material smoothing capability.
If the number of the initial twist of twisted yarn (and/or final twist) then adds twisted filament and becomes crepe twist yarn, and be not easy to flatten in base material not in the scope of every meter 30 to 100 twist.
If the ratio of (number of the initial twist)/(number of the final twist) falls into 1.2 to 1.4 scope, then the twisted yarn in the base material is easy to flatten, and is the stable soft twist yarn of not kink and loose sub-thread.If in 1.2 to 1.4 scope, then the twisted yarn in the base material does not limpen the ratio of the number of the twist (initial)/(number of the final twist), is not evenly flat.
Comprise the pencil long filament that contains core-skin composite fiber according to soft twist yarn of the present invention (twisted yarn).The ratio of the long filament in core-skin composite fiber should be preferably twisted yarn long filament total number 25% to 75%.
First reason that adopts aforementioned proportion be if the ratio of the long filament in core-skin composite fiber less than 25%, then they can not be fixed to the bat fiber that comprises core-skin composite fiber well when fusion, and have the relatively poor function that twisted yarn is flattened.
Second reason that adopts aforementioned proportion is if the ratio of the long filament in core-skin composite fiber surpasses 75%, and then yarn becomes peaceful, and is fixed to the bat fiber that comprises core-skin composite fiber when fusion too doughtily, and this makes that the water extrusion capability of felted terxture is relatively poor.
According to soft twist yarn of the present invention can be to comprise that fineness is the spun yarn (spun yarn) of the staple fibre yarn (staple yarn) of 6 to 50 dtexs, and it comprises core-skin composite fiber.
Felted terxture according to the present invention has fabulous wet web smoothing capability and fabulous anti-fiber shifts out ability, and this is because the soft twist yarn of base material is flat, and the gap between yarn is closed.For making the yarn of base material be easier to flatten, felted terxture comprises the base material that is formed by warp thread and weft yarn, and has end structure is arranged.
Thereby with rolls around repeatedly it being stacked into the base material that piles up.Because in the soft twist yarn than the upper strata was arranged to be embedded in gap between the twisted yarn of lower level, therefore the layer of the base material that piles up was fine and close.
The bat fiber and the whole twisted of the base material that piles up that will comprise core-skin composite fiber by needle point method.Comprise that the low-melting component of bat fiber of core-skin composite fiber and the low-melting component of yarn merge through heating, be easy to the gap between the yarn of the base material that closure piles up.
According to another specific embodiments, soft twist yarn is made into flat, and gap therebetween is easy to closure.According to another specific embodiments, base material comprises the multilayer woven fabric that is woven at least one double-deck weavy grain.The soft twist yarn of multilayer woven fabric is flat.
For the base material that piles up that end structure is arranged, when fusion comprises the low-melting component of the low-melting component of bat fiber of core-skin composite fiber and yarn, be easy to the gap between the soft twist yarn of closed multilayer woven fabric.
The number of the twisted point between warp thread of base material (MD yarn) and the weft yarn (CD yarn) is less to be effectively, thereby makes that yarn is easy to flatten when yarn constitutes base material, makes that also the gap between the soft twist yarn is easy to closure.
For this reason, with warp thread (MD yarn) and the weft yarn (CD yarn) of solvent soluble long filament (particularly water-soluble long filament), and be woven into woven fabric as base material.Then, by the acupuncture punching bat fiber is implanted in the woven fabric.Afterwards, dissolve the sub-thread of woven fabric so that the gap between yarn is easy to be closed.
Though the solvent soluble long filament can be got by polyvinyl alcohol, acrylic resin or polyester, they are especially preferably made by water-soluble poval.
Except water-soluble poval, the twisted yarn of base material and sub-thread are got by nylon or polyester.Especially, preferred nylon yarn is because they have fabulous intensity and durability.
In felted terxture according to the present invention, will comprise that the bat fiber of core-skin composite fiber and one or two surface of base material carry out whole twisted.Therefore according to the present invention, when heating and melting, the low-melting component of the core-skin composite fiber in the bat fiber can be fastened to each other with the low-melting component of the yarn of the base material that comprises core-skin composite fiber.As a result, improved the interfibrous bond strength of base material and bat, made felted terxture have fabulous anti-fiber and shift out ability.
Especially, comprise that the bat fiber of core-skin composite fiber preferably is used in the bat layer of base material front (l Water Paper breadth).
The percentage composition of the core-skin composite fiber in the bat layer on the base material front should be preferably 25% to 75%.First reason that adopts this percentage composition be if the percentage composition of core-skin composite fiber less than 25%, then the interfibrous bond strength of base material and bat a little less than, cause poor anti-fiber to shift out ability.Second reason is that if the percentage composition of core-skin composite fiber surpasses 75% then the fibrolaminar ability that is compressed and recovers of bat reduces, and felted terxture has poor water extrusion capability.
Bat layer in the base material front can be a sandwich construction, and the percentage composition of core-skin composite fiber can progressively be raise towards wet web by the front of base material.
The nylon of the core component of core-skin composite fiber is nylon 6, nylon 66, nylon 46, NYLON610 or nylon 612 preferably.Especially, the nylon that polycondensation by nylon salt makes is preferred, the polycondensation (nylon 66), 1 of for example polymerization of epsilon-caprolactams (nylon 6), hexamethylene diamine adipate, the polycondensation (nylon 612) of the polycondensation (nylon 46) of 4-butanediamine adipate, the polycondensation (NYLON610) of hexamethylene diamine sebacate or dodecanedioic acid salt.Especially, having enumerated the fusing point that is recorded by DSC (differential scanning calorimetry) is 200 ℃ or higher aliphatic nylon.
The nylon of the skin component of core-skin composite fiber should be preferably the nylon that its fusing point is lower than core component.Described nylon can be bipolymer nylon or terpolymer nylon.
Bipolymer nylon can be nylon 6/12, nylon 6/610, nylon 66/6, nylon 66/12, nylon 66/610 or analog.Terpolymer nylon can be nylon 6/66/12, nylon 6/66/610 or analog.
Be known that these copolymer nylon have the fusing point that can change according to composition (the weight % of copolymer component).Can be used for copolymer nylon of the present invention is limited in those fusing points and is at most 180 ℃ nylon.
Preferably, the base material that piles up of papermaking felt comprises one of at least the soft twist yarn that contains core-skin composite fiber.When yarn constituted base material, yarn flattened, and comprised that the low-melting component of bat fiber of core-skin composite fiber and the low-melting component of yarn are melted with the gap between the closed yarn.As a result, papermaking felt has fabulous water extrusion capability, fabulous wet web smoothing capability and fabulous anti-fiber and shifts out ability.
According to the present invention of arrangement like this, provide a kind of have fabulously be compressed with recovery capability and have the felted terxture that fabulous anti-fiber shifts out ability.If felted terxture is as papermaking felt, then when being exerted pressure by roller or shoe press plate in paper technology, it has excellent compression and compares and fabulous recovery ratio.
Do not lose the wet web smoothing capability according to felted terxture of the present invention, stoped fiber to be moved out of, have good water extrusion capability, and make the water plasticating capacity keep high level for a long time.Described felted terxture also has high-performance, is fit to fair speed operation and its elevated pressures that applies at pressurised zone of paper machine in recent years.
Description of drawings
Fig. 1 is the sectional view according to the common felted terxture of paper grade (stock) of background technology;
Fig. 2 is the sectional view according to the papermaking felt of inventive embodiments 1 to 4 of the present invention;
Fig. 3 is the sectional view according to the papermaking felt of comparing embodiment 1 of the present invention;
Fig. 4 is the figure according to experimental provision of the present invention; And
Fig. 5 is the schematic diagram of pressue device.
The specific embodiment
Papermaking felt according to specific embodiments of the present invention will be described as shown in Figure 2.Fig. 2 is the sectional view according to the papermaking felt of specific embodiments of the present invention.
As shown in Figure 2, papermaking felt 100 according to the present invention comprises substrate layer 200 and bat fibrage 300.By the acupuncture punching bat fiber (staple fibre) and substrate layer 200 whole twisteds are made bat fibrage 300.
Substrate layer 200 comprises two base materials (i.e. first base material 210 and second base material 220) that pile up.In substrate layer 200, the first single base material 210 is as giving the medium of mechanical strength for felted terxture 100.First base material 210 is not defined as specific material, but can be made up of arbitrary material of multiple enough strong material.For example, first base material 210 can comprise by warp thread (MD yarn) 212 and weft yarn (CD yarn) 211 woven fabric that form.
In felted terxture shown in Figure 2 100, first base material 210 piles up mutually with second base material 220 (they are different types).But, satisfying in the scope of requirement of the present invention at second base material 220, first base material 210 can be identical type with second base material 220.
According to a kind of distortion, can form by warp thread (MD yarn) and weft yarn (CD yarn) than felted terxture to be finished 100 narrow woven fabric.Afterwards, can the screw winding woven fabric, thus and the woven fabric of preparation that the limit of adjacent woven fabric bar can be linked together as the connection of first base material 210.
According to another distortion, can be with the coaxial base material that is used as first base material 210 that is wound into of base material that has same widths and form with felted terxture 100 to be finished by warp thread (MD yarn) and weft yarn (CD yarn).
According to another distortion, with the woven base material of its use, not as the base material that uses the base material that forms by the warp thread that combines by adhesive (MD yarn) or form by the warp thread (MD yarn) and the weft yarn (CD yarn) of non-woven stack as first base material 210.
According to the present invention, second base material 220 also additionally is stacked on first base material 210, and this has constituted substrate layer 200 on the whole.Second base material 220 comprises by warp thread (MD yarn) 222 and weft yarn (CD yarn) 221 woven fabric that form.
Especially, warp thread 222 or weft yarn 221 comprise contain core-skin composite fiber soft twist yarn its be that the long filament of 50 to 400 dtexs is formed by fineness.Other warp thread 222 and weft yarn 221 comprise the woven fabric that is formed by the long filament of 50 to 600 dtexs or solvent soluble long filament.
In felted terxture shown in Figure 2 100, by two the surface whole twisteds of acupuncture punching with bat fiber and substrate layer 200.Comprise that the bat fibrage 300 of core-skin composite fiber is placed on the front (l Water Paper breadth) of second base material 220 as bat.When the low-melting component of the low-melting component of the bat fiber that comprises core-skin composite fiber and yarn was melted, they were tending towards the gap between the closed yarn.
According to the present invention, in felted terxture preparation technology's heat treatment step, the low-melting component (skin component) that is included in the low-melting component (skin component) of the core-skin composite fiber (staple fibre) in the bat fibrage 300 and is included in the core-skin composite fiber (long filament) in the soft twist yarn is melted and link together.
Inventive embodiments:
Hereinafter will specifically describe the present invention by a plurality of inventive embodiments.
In each inventive embodiments, second base material 220 (perhaps second base material 230,240 or 250) with feature of the present invention is stacked on first base material 210, and this has constituted whole substrate layer 200.In all inventive embodiments, first base material 210 comprises the base material with following structure:
(inventive embodiments 1)
The structure of first base material 210:
(1) MD yarn and CD yarn: MD yarn and CD yarn all comprise twisted yarn as described below.
(2) twisting condition: " 2/2/220 "
Twisted yarn representation [" // "] in quotation marks above is meant [(number of the sub-thread bundle of initial twisting when they are finally twisted)/(number of single sub-thread bundle when they are initially twisted)/(single yarn fineness=dtex)].
(3) initial twisting: the 250S-twist/rice
(4) final twisting: the 160Z-twist/rice
Because yarn is initially twisted greater than 150 times/meter, finally twisted, so they are crepe twist yarns greater than 150 times/meter." the S-twist " is meant that the sub-thread in the twisting of yarn surface extends to the right downwards, and " the Z-twist " is meant that the sub-thread of twisting extends to the left side downwards on the yarn surface.
(5) twist than (initial/final): 1.56
(6) weave:
First base material (woven fabric) 210 is by the MD yarn: 120 yarns/5 centimetre and CD yarn: 40 yarns/5 centimetre, and weave with the double-deck weavy grain of 3/1,1/3 hollow warp thread and to form.
As shown in Figure 2, felted terxture 100 is prepared as and wherein bat fibrage 300 is stacked on the substrate layer 200 that is made of first base material 210 and second base material 220 that piles up thereon.
The structure of second base material 220:
(1) MD yarn: they comprise following twisted yarn:
(a) twisting condition: " 2/2/220 "
(b) ratio of the long filament in core-skin composite fiber: yarn comprises a long filament (25%).
(c) initial twisting: the 42S-twist/rice
(d) final twisting: the 30Z-twist/rice
(e) twist than (initial/final): 1.40
(2) CD yarn: single yarn (diameters of 330 dtexs)
(3) weave:
Second base material (woven fabric) 220 is by the MD yarn: 40 yarns/5 centimetre and CD yarn: 34 yarns/5 centimetre, and weave with 3/1 flat hollow individual layer weavy grain and to form.
(4) form bat fibrage 300:
On the upper surface of second base material 220, form the bat fibrage 300 that comprises core-skin composite fiber.The percentage composition of core-skin composite fiber is 25%.
(inventive embodiments 2)
Preparation method according to the felted terxture 100 of inventive embodiments 2 is: pile up base material as mentioned below 230 as second base material to replace according to inventive embodiments 1 described base material 220.Especially, pile up base material 220 in second base material, 230 alternate figures 2.
The structure of second base material 230:
(1) MD yarn: they comprise following twisted yarn:
(a) twisting condition: " 2/2/220 "
(b) ratio of the long filament in core-skin composite fiber: yarn comprises two long filaments (50%).
(c) initial twisting: the 42S-twist/rice
(d) final twisting: the 30Z-twist/rice
(e) twist than (initial/final): 1.40
(2) CD yarn: single yarn (diameters of 330 dtexs)
(3) weave:
Second base material (woven fabric) 230 of stacked structure makes by the method that woven fabric is wound into two stack layers, and described woven fabric is by the MD yarn: 40 yarns/5 centimetre and CD yarn: 34 yarns/5 centimetre have end structure 3/1 flat individual layer weavy grain to weave to form to have.
(4) form bat fibrage 300: it is identical with inventive embodiments 1.
(inventive embodiments 3)
Preparation method according to the felted terxture 100 of inventive embodiments 3 is: pile up base material as mentioned below 240 as second base material to replace according to inventive embodiments 1 described base material 220.Especially, pile up base material 220 in second base material, 240 alternate figures 2.
The structure of second base material 240:
(1) MD yarn: they comprise following twisted yarn:
(a) twisting condition: " 2/2/220 "
(b) ratio of the long filament in core-skin composite fiber: yarn comprises two long filaments (50%).
(c) initial twisting: the 70S-twist/rice
(d) final twisting: the 50Z-twist/rice
(e) twist than (initial/final): 1.40
(2) CD yarn: single yarn (diameters of 330 dtexs)
(3) weave:
Second base material (woven fabric) 240 of stacked structure makes by the method that woven fabric is wound into two stack layers, and described woven fabric is by the MD yarn: 40 yarns/5 centimetre and CD yarn: 34 yarns/5 centimetre have end structure 3/1 flat individual layer weavy grain to weave to form to have.
(4) form bat fibrage 300:
On the upper surface of second base material 240, form the bat fibrage 300 that comprises core-skin composite fiber.The percentage composition of core-skin composite fiber is 50%.
(inventive embodiments 4)
Preparation method according to the felted terxture 100 of inventive embodiments 4 is: pile up base material as mentioned below 250 as second base material to replace according to inventive embodiments 1 described base material 220.Especially, pile up base material 220 in second base material, 250 alternate figures 2.
The structure of second base material 250:
(1) MD yarn: they comprise following twisted yarn:
(a) twisting condition: " 2/2/220 "
(b) ratio of the long filament in core-skin composite fiber: yarn comprises three long filaments (75%).
(c) initial twisting: the 120S-twist/rice
(d) final twisting: the 100Z-twist/rice
(e) twist than (initial/final): 1.20
(2) CD yarn: the long filament of the polyvinyl alcohol resin of 400 dtexs (water-soluble).
(3) weave:
Second base material (woven fabric) 250 is by the MD yarn: 90 yarns/5 centimetre and CD yarn: 30 yarns/5 centimetre, and weave with the double-deck weavy grain of 3/1,1/3 hollow warp thread and to form.
(4) form bat fibrage 300:
On the upper surface of second base material 250, form the bat fibrage 300 that comprises core-skin composite fiber.The percentage composition of core-skin composite fiber is 75%.
(5) hot water washes away:
After forming bat fibrage 300, wash away in the hot water that technology is immersed in this assembly 40 ℃ 30 minutes with dissolving CD yarn according to hot water.Then, on first base material 210, form the base material 250 that only constitutes by the MD yarn.
(comparing embodiment 1)
Fig. 3 is the sectional view according to the papermaking felt 100a of comparing embodiment 1.
As shown in Figure 3, comprise first base material 210 according to the felted terxture 100a of comparing embodiment 1 and have same structure with first base material 210 and be stacked on base material 210 on first base material 210.First base material 210 and base material 210 constitute substrate layer 260.Bat fibrage 300 is stacked on the substrate layer 260, and has identical structure with inventive embodiments 1.
Felted terxture according to inventive embodiments 1 to 4 and comparing embodiment 1 rotates with 2 meters/minute speed circulation around pair of rolls, and is heated under 180 ℃ by hot-air.Then, be that the pressure roller of 160 ℃ heating is applied to the bat layer on felted terxture surface with surface temperature, thereby make papermaking felt.
Adopt the bat fibrage 300 of same amounts (basic weight: gram/square metre) to be prepared according to all felted terxtures of inventive embodiments and comparing embodiment, and the ability of assessing the level and smooth index of its paper web, be compressed and recover by following method, keep the ability and the anti-fiber that are compressed with recovery capability and shift out ability:
(1) the level and smooth index of paper web: it is represented by the inverse according to the determined numerical value of variance of the adjacent peak of the surface irregularity of JIS B061-1982 (surface irregularity) papermaking felt and the distance between the paddy.When the level and smooth index of paper web was higher, the variance of the distance between the surface irregularity was less, and smoothing capability is higher.
(2) be compressed and the ability recovered and keep the ability that is compressed with recovery capability:
Make felted terxture 100,100a pass through experimental provision as shown in Figure 4.By sensor measure at first not to felted terxture 100 respectively, when 100a exerts pressure, by the pressure roller compression they the time and after they are released pressure the thickness of felted terxture 100,100a.Calculate the compression ratio of felted terxture 100,100a and recover ratio according to following equation, assess felted terxture 100 thus, 100a is compressed and the ability recovered and keep the ability that is compressed with recovery capability:
Compression ratio (%)=(thickness of felted terxture when felted terxture is compressed)/(thickness of felted terxture when felted terxture not being exerted pressure at first) * 100
Recovery is than (%)=(the directly thickness of felted terxture after felted terxture is released pressure)/(thickness of felted terxture when felted terxture is compressed) * 100
Experimental provision has a pair of pressure roller PR, and a plurality of deflector roll GR are with in constant-tension lower support felted terxture 100,100a and first sensor and the second sensor (not shown).
First sensor measure when by pressure roller PR to felted terxture 100, the thickness of felted terxture 100,100a when 100a exerts pressure.Directly at felted terxture 100,100a by the thickness of the second sensor measurement felted terxture 100,100a behind pressure roller PR release pressure.
Finish drilling in following condition and to make experimental provision: double centner/centimetre pressure press down felted terxture, and with 1,000 meter/minute speed Continuous Drive felted terxture 120 hours.
Based on the compression that obtains by above-mentioned measurement with recover ratio, adopt relative evaluation point assessment and felted terxture 100 is kept in expression, 100a is compressed and the ability of recovery capability.
The numerical value of inventive embodiments 1 is considered to evaluation point " 3 ", used as the criterion evaluation point.If numerical value overgauge evaluation point " 3 ", then they are judged as " well ".If numerical value is less than criterion evaluation point " 3 ", then they are judged as " bad ".Therefore, numerical value is high more, and evaluation point is high more.The result (relatively) who keeps ability is shown in table 1.
(3) anti-fiber shifts out ability: shift out JIS1023-1992 in the ability experiment based on anti-fiber, use Taber abrasion tester to measure the amount that shifts out fiber from felted terxture.
The following operation of tester: the disc sample is placed on the revolving-turret, props up (held against) sample to measure the fibre weight that in sample, shifts out with high resistant rotation roller.In experiment, rotate the fibre weight that measurement is shifted out after 5,000 times at turntable.
By with the fibre weight that shifts out in the felted terxture that is made as " 100 " according to comparing embodiment 1 relatively assess the fibre weight that shifts out.The result of the amount of the fiber that shifts out (relatively) is shown in table 1.
[table 1]
In papermaking felt 100 according to the present invention, one of base material that piles up is formed by the soft twist yarn that comprises core-skin composite fiber.This yarn (twisted yarn) is flat, and the low-melting component institute that gap therebetween is melted is closed.
By the result shown in the table 1 as can be seen, papermaking felt 100 according to the present invention have good paper web smoothing capability, good be compressed to be compressed with the ability of recovery capability and good anti-fiber with recovery capability, good keeping shift out ability.
In the felted terxture 100a according to comparing embodiment 1, two first base materials 210 pile up mutually.Each is identical with another by first base material 210 of MD yarn and CD weaving yarns.Have keeping to be compressed and shifting out ability of being compressed of poor paper web smoothing capability, difference and recovery capability, difference according to the felted terxture 100a of comparing embodiment 1 with the ability of recovery capability and the anti-fiber of difference.
Specific embodiments of the present invention described above (comprising distortion and inventive embodiments).The present invention is not limited to above-mentioned specific embodiments, can carry out various changes and interpolation to specific embodiments within the scope of the invention.
Same reference numerals is in the drawings represented identical or corresponding part.
Industrial applicability
Papermaking felt according to the present invention is suitable as felted terxture, and it is in the pressurization of paper machine Thereby the zone can be applied in pressure and push water outlet in wet web.
Claims (6)
1, a kind of papermaking felt, it comprises one type or dissimilar two or more base materials and comprises core-skin composite fiber and by a surface of needle point method and base material or the bat fiber of two whole twisteds in surface,
Wherein, at least one base material is by comprising that the weak twist warp thread that contains core-skin composite fiber or the twisted yarn of weft yarn form.
2, papermaking felt according to claim 1,
Wherein said base material is formed by warp thread and weft yarn, and has end structure is arranged,
Described base material is reeled repeatedly forms the base material that piles up, and
The weak twist warp thread or the weft yarn that comprise the described core-skin composite fiber of the described base material that piles up are flat, and the gap between the yarn is comprised the low-melting component closure of the fusion of the low-melting component of fusion of described bat fiber of core-skin composite fiber and described yarn.
3, papermaking felt according to claim 1,
Wherein, described base material comprises the multilayer woven fabric that is woven at least one double-deck weavy grain, and
The weak twist warp thread or the weft yarn that comprise the described core-skin composite fiber of described multilayer woven fabric are flat, and the gap between the yarn is comprised the low-melting component closure of the fusion of the low-melting component of fusion of described bat fiber of core-skin composite fiber and described yarn.
4, according to each described papermaking felt in the claim 1 to 3,
The described warp thread or the described weft yarn of wherein said base material comprise the yarn that contains core-skin composite fiber, and are twisted as the long filament that fineness is 50 to 400 dtexs by being added.
5, according to each described papermaking felt in the claim 1 to 4,
Wherein said soft twist yarn has 30 to 100 the final twist for every meter, and the ratio of the number of the initial twist and the number of the final twist is 1.2 to 1.4.
6, according to each described papermaking felt in the claim 1 to 3, the described warp thread or the described weft yarn of wherein said base material comprise the solvent soluble long filament.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006186296A JP4958491B2 (en) | 2006-07-06 | 2006-07-06 | Felt for papermaking |
| JP186296/2006 | 2006-07-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101484635A true CN101484635A (en) | 2009-07-15 |
Family
ID=38894589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800254063A Pending CN101484635A (en) | 2006-07-06 | 2007-07-05 | Papermaking felt |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2042653A1 (en) |
| JP (1) | JP4958491B2 (en) |
| KR (1) | KR20090034832A (en) |
| CN (1) | CN101484635A (en) |
| CA (1) | CA2656889A1 (en) |
| WO (1) | WO2008004622A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010196206A (en) * | 2009-02-26 | 2010-09-09 | Ichikawa Co Ltd | Felt for making paper |
| JP5571403B2 (en) * | 2010-02-09 | 2014-08-13 | 日本フエルト株式会社 | Papermaking felt and method for producing the same |
| US8961742B2 (en) | 2011-07-22 | 2015-02-24 | Astenjohnson, Inc. | Multiaxial press felt base fabric including cabled monofilaments |
| CN105121719B (en) | 2013-02-06 | 2017-09-26 | 艾斯登强生股份有限公司 | The press felt substrate fabric for reducing interference is presented |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03104995A (en) * | 1989-09-19 | 1991-05-01 | Daiwabo Co Ltd | Needle felt for paper making |
| US5549967A (en) | 1995-05-04 | 1996-08-27 | Huyck Licensco, Inc. | Papermakers' press fabric with increased contact area |
| JP3269601B2 (en) * | 1996-01-29 | 2002-03-25 | 市川毛織株式会社 | Needle felt for papermaking |
| WO1998012371A1 (en) * | 1996-09-18 | 1998-03-26 | Albany International Corp. | Yarns of covered high modulus material and fabrics formed therefrom |
| JP3415787B2 (en) * | 1999-03-24 | 2003-06-09 | 市川毛織株式会社 | Press felt for papermaking |
| JP2002161492A (en) * | 2000-11-30 | 2002-06-04 | Nippon Felt Co Ltd | Composite fabric for paper making |
| JP4081293B2 (en) | 2001-04-27 | 2008-04-23 | 日本フエルト株式会社 | Papermaking felt |
| JP4565625B2 (en) * | 2003-12-15 | 2010-10-20 | イチカワ株式会社 | Papermaking press felt and papermaking press |
-
2006
- 2006-07-06 JP JP2006186296A patent/JP4958491B2/en active Active
-
2007
- 2007-07-05 KR KR1020087031942A patent/KR20090034832A/en not_active Application Discontinuation
- 2007-07-05 EP EP07768211A patent/EP2042653A1/en not_active Withdrawn
- 2007-07-05 WO PCT/JP2007/063462 patent/WO2008004622A1/en active Application Filing
- 2007-07-05 CA CA002656889A patent/CA2656889A1/en not_active Abandoned
- 2007-07-05 CN CNA2007800254063A patent/CN101484635A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP4958491B2 (en) | 2012-06-20 |
| KR20090034832A (en) | 2009-04-08 |
| EP2042653A1 (en) | 2009-04-01 |
| WO2008004622A1 (en) | 2008-01-10 |
| CA2656889A1 (en) | 2008-01-10 |
| JP2008013878A (en) | 2008-01-24 |
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