WO2007043632A9 - Feutre de machine a papier et appareil de presse a sabot - Google Patents

Feutre de machine a papier et appareil de presse a sabot

Info

Publication number
WO2007043632A9
WO2007043632A9 PCT/JP2006/320426 JP2006320426W WO2007043632A9 WO 2007043632 A9 WO2007043632 A9 WO 2007043632A9 JP 2006320426 W JP2006320426 W JP 2006320426W WO 2007043632 A9 WO2007043632 A9 WO 2007043632A9
Authority
WO
WIPO (PCT)
Prior art keywords
layer
wet paper
shoe
fiber
papermaking
Prior art date
Application number
PCT/JP2006/320426
Other languages
English (en)
Other versions
WO2007043632A1 (fr
Inventor
Takashi Ouchi
Original Assignee
Ichikawa Co Ltd
Takashi Ouchi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ichikawa Co Ltd, Takashi Ouchi filed Critical Ichikawa Co Ltd
Priority to EP06811714A priority Critical patent/EP1957710A1/fr
Publication of WO2007043632A1 publication Critical patent/WO2007043632A1/fr
Publication of WO2007043632A9 publication Critical patent/WO2007043632A9/fr

Links

Classifications

    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip

Definitions

  • the present invention relates to a papermaking felt, especially for a shoe press, and a shoe press apparatus for a paper machine in which the papermaking felt is employed.
  • a press part of a shoe press type paper machine is provided with a press apparatus .
  • the press apparatus includes a plurality of press mechanisms aligned in series along a direction of carrying a wet paper.
  • Each press mechanism includes a pair of papermaking felts of an endless belt type, and a roll and a shoe (namely, a shoe press) arranged so as to face each other in a vertical direction and to interpose respective portions of the papermaking felts therebetween.
  • the wet paper is carried by the papermaking felts which travels in the same direction substantially at equal speed, and is pressed by the roll and the shoe with the papermaking felts, thereby squeezing out water from the wet paper so as to be absorbed to the papermaking felts.
  • a press zone of a press portion (namely, a nip) formed between the roll and the shoe can be widely provided in comparison with a more general press mechanism having a roll press ('namely, a press mechanism which employs a pair of rolls in place of a combination of a roll and a shoe) .
  • a press time period can be prolonged and therefore, the above-described press mechanism is further excellent in a water squeeze out performance .
  • JP-A-2004-143627 discloses a papermaking felt having a hydrophilic nonwoven cloth disposed inside a batt layer so as to suppress the occurrence of the re-wetting phenomenon batt layer.
  • the hydrophilic nonwoven cloth may be, for example, a cloth constituted by laminating fibers formed by melting and spinning a resin, such as a span bond nonwoven cloth constituted by laminating continuous filaments, or a sheet-like nonwoven cloth formed by stretching a melted polymer with hot wind so as to be formed into fine fibers.
  • the hydrophilic nonwoven cloth has a higher density and a lower permeability relative to batt fibers. Therefore, in a papermaking felt, it is difficult for water inside the batt layer arranged on a roll side (or a shoe side) of the hydrophilic nonwoven cloth to move to the batt layer on the the wet paper side or to the wet paper by permeating the hydrophilic nonwoven cloth. Therefore, by the hydrophilic nonwoven cloth, the water inside the batt fiber on the roll side (or the shoe side) is prevented from being returned to the wet paper. Further, a fineness of the hydrophilic nonwoven cloth is lower than a fineness of the batt layer. Therefore, it is easy for the water inside the batt layer arranged on the wet paper side of the hydrophilic nonwoven cloth to be shifted to the hydrophilic nonwoven cloth by the capillary phenomenon, thereby preventing the re-wetting phenomenon.
  • a shoe press apparatus for a paper machine in comparison with a roll press apparatus, water is squeezed out by applying a very large pressure on the papermaking felt at the press portion (namely, the nip) . Therefore, the papermaking felt easily becomes flattened, and result in having a high density.
  • stain specifically, components of an additive, a glue and the like included in the wet paper
  • the fallen-off fibers or the cut-off fibers are bolder and harder than fibers of the wet paper, there is a case where the paper is made with such fibers being adhered on the surface thereof, and a printing adaptability becomes inferior. More specifically, there is a case where a decoloration occurs when printing. In such way, the unhairing of fibers at the surface of the batt layer where the wet paper directly comes into contact deteriorates a quality of a paper product such as a printed matter. On the other hand, the surface of the batt layer constitutes a factor of significantly deteriorating a smoothness of a surface of the wet paper since the surface of the batt layer is roughened by the unhairing of fibers.
  • a papermaking felt of a press apparatus for a paper machine in which the paper making felt is disposed between a roll and a wet paper or between a shoe and the wet paper, the papermaking felt includes: a base layer; a first batt layer formed on the base layer on the wet paper side; and a contacting layer formed on the first batt layer on the wet paper side where the wet paper directly comes into contact.
  • the contacting layer includes a hydrophilic fiber, and the hydrophilic fiber is fibrillated when pressed by the roll and the shoe.
  • An amount of the hydrophilic fiber with respect to the contacting layer may be 15 % to 100 % by weight, and the rest of the contacting layer'may be formed by a nonhydrophilic fiber .
  • the papermaking felt may further include a hydrophilic nonwoven cloth layer between the base layer and the contacting layer .
  • the papermaking felt may further include a second batt layer formed on the base layer on the roll side or the shoe side .
  • a shoe press apparatus for a paper machine includes: a shoe; a pair of papermaking felts interposing a wet paper therebetween; and a roll disposed such that the pair of papermaking felts is interposed between the shoe and the roll.
  • At least one of the papermaking felts includes: a base layer; a first batt layer formed on the base layer on the wet paper side; and a contacting layer formed on the first batt layer on the wet paper side where the wet paper directly comes into contact.
  • the contacting layer includes a hydrophilic fiber, and the hydrophilic fiber is fibrillated when pressed by the roll and the shoe.
  • An amount of hydrophilic fiber with respect to the contacting layer may be between 15 % and 100 % by weight, and the rest of the contacting layer may be formed by a nonhydrophilic fiber.
  • At least one of the papermaking felts may further include a hydrophilic nonwoven cloth layer between the base layer and the contacting layer.
  • At least one of the papermaking felts may further include a second batt layer formed on the base layer on the roll side or the shoe side.
  • each press mechanism include: a shoe; a pair of papermaking felts interposing a wet paper therebetween; and a roll disposed such that the pair of papermaking felts is interposed between the shoe and the roll.
  • At least one of the papermaking felts includes: a base layer; a first batt layer formed on the base layer on the wet paper side; and a contacting layer formed on the first batt layer on the wet paper side where the wet paper directly comes into contact.
  • The' contacting layer includes a hydrophilic fiber, and the hydrophilic fiber is fibrillated when pressed by the roll and the shoe.
  • An amount of hydrophilic fiber with respect to the contacting layer may be between 15 % and 100 % by weight, and the rest of the contacting layer may be formed by a nonhydrophilic fiber.
  • At least one of the papermaking felts of the press mechanism aligned at downstream side along the direction of carrying the wet paper may further include a hydrophilic nonwoven cloth layer between the base layer and the contacting layer .
  • At least one of the papermaking felts may further include a second batt layer formed on the base layer on the roll side or the shoe side.
  • the contacting layer including the hydrophilic fiber fibrillated into micro fibers by being pressed by the shoe press is formed on the surface of the first batt layer on the wet paper side of the papermaking felt where the wet paper comes into contact. Therefore, when the contacting layer including the hydrophilic fiber which becomes a micro fiber having a extremely low fineness by being fibrillated is formed, a surface smoothness of the wet paper can be promoted.
  • stain specifically, a component of an additive, a glue or the like included in the wet paper
  • stain temporarily adhered to the papermaking felt is fallen off from the papermaking felt along with the micro fiber by a so-called unharing phenomenon of the micro fiber formed by fibrillating the hydrophilic fiber. Therefore, the stain is difficult to remain at the papermaking felt.
  • a micro fiber namely, the small fiber formed by fibrillating the hydrophilic fiber
  • the small fiber is extremely fine, quality of the wet paper is not deteriorated.
  • the stain does not effect any influence on the quality of the wet paper.
  • a surface of a paper fabricated by the shoe press type paper machine using the papermaking felt becomes extremely smooth, further, service life of the papermaking felt (namely, a time period capable of using the papermaking felt) is prolonged. Therefore, there can be reduced a frequency of maintenance of interchanging the papermaking felt by a new one or cleaning the papermaking felt in the midst of making paper or the like. Therefore, it is preferable that the hydrophilic fiber is included at least at a surface of the contacting layer brought into direct contact with the wet paper.
  • the fibrillation of the hydrophilic fiber of the contacting layer of the papermaking felt is carried out instantly in trial operation (namely, so-called running in operation) of the shoe press apparatus of the paper machine. Therefore, high quality paper can stably be fabricated from the beginning of paper making operation, and a time period until stabilizing the paper making operation can considerably be shortened.
  • the hydrophilic fiber used in the papermaking felt be a fiber fibrillated by being pressed by the shoe press, the fiber is not fibrillated but maintains a comparatively bold state at a carding step or a needling step during a process of manufacturing the papermaking felt.
  • a fiber block (namely, block of fiber) is easy to be produced.
  • the fiber block is implanted to the felt in the needling step to form recesses and projections at a surface of the papermaking felt. Therefore, a surface smoothness of the wet paper is deteriorated.
  • the contacting layer including the hydrophilic fiber fibrillated into a micro fiber by being pressed by the shoe press, such a drawback can be overcome.
  • the weight rate of the hydrophilic fiber is defined by "weight of hydrophilic fiber/ (weight of hydrophilic fiber + weight of nonhydrophilic fiber) x 100".
  • the nonhydrophilic fiber is a normal ordinary fiber which is not fibrillated even in the carding step or the needling step or even by being pressed by the shoe press (namely, roll and shoe) .
  • a surface smoothness and a water squeeze out property constituting properties requested for the papermaking felt are brought into an inversely proportional relationship, when a density of the papermaking felt is increased in order to promote the function of smoothing the surface of the wet paper, the water squeeze out property tends to be deteriorated.
  • functions which differ from each other delicately are requested for a plurality of the press mechanisms arranged from upstream to downstream of a direction of carrying the wet paper to be carried, the water squeeze out property is emphasized in the papermaking felt of the press mechanism arranged on the upstream side, further, a function of smoothing the surface of the wet paper is requested for the papermaking felt of the press mechanism arranged on the downstream side. Therefore, the papermaking felts can be provided with properties (surface smoothness, water squeeze out property or the like) optimum for the respective press mechanisms by pertinently changing the weight rate of the hydrophilic fiber.
  • the hydrophilic nonwoven cloth layer is provided between the base layer and the contacting layer and therefore, reshifting of moisture temporarily absorbed from the wet paper to the papermaking felt (namely, so-called re-wetting phenomenon) is hampered by the hydrophilic nonwoven cloth layer.
  • the shoe press apparatus is provided with the papermaking felt as described above. Therefore, excellent operation and effect are achieved as described above.
  • the arrangement is particularly preferable in view of squeezing out water efficiently from the wet paper. Namely, a large amount of water can effectively be squeezed out from the wet paper including much of the moisture, thereby, the papermaking felt can be provided with an excellent paper separating function in delivering the wet paper and therefore, the paper making operation can be carried out at high speed.
  • a water permeating function may slightly be deteriorated in comparison with those of the papermaking felts without the hydrophilic nonwoven cloth layer.
  • the press apparatus is particularly preferable in view of preventing the re-wetting phenomenon and preferable in view of smoothing the surface of the wet paper.
  • Fig.l is a vertical sectional view of a papermaking felt according to a first embodiment of the invention.
  • Fig.2 is a vertical sectional view of a papermaking felt according to a second embodiment of the invention.
  • Fig.3 is an outline view for explaining of a shoe press apparatus of a paper machine according to another embodiment the invention.
  • Fig.l is a vertical sectional view of a papermaking felt 100 according to the first embodiment of the invention
  • Fig.2 is a vertical sectional view of a papermaking felt 200 according to the second embodiment of the invention
  • Fig.3 is an outline view for explaining a shoe press apparatus of a paper machine according to another embodiment of the invention.
  • the papermaking felt 100 includes a base layer 11, a batt layer 13 (a first batt layer 13A and a second batt layer 13B), and a contacting layer 15. More specifically, the first batt layer 13A is formed on a surface of the base layer 11 on a wet paper side, the second batt layer 13B is formed on the other surface of the base layer 11 on a roll side or a shoe side, and the contacting layer 15 is formed on a surface' of the first batt layer 13A on the wet paper side where the wet paper comes into contact.
  • the base layer 11, the batt layer 13 (the first batt layer 13A and the second batt layer 13B) and the contacting layer 15 are entwined and integrated by needling.
  • the base layer 11 is for providing a strength to the papermaking felt 100.
  • a woven cloth or a nonwoven string material that are laminated together or formed into a film-like shape may be used.
  • a material thereof for example, a synthetic fiber such as nylon 6 and nylon 66 that are excellent in wear resistance, fatigue resistance, elongating property and stain proof, or a natural fiber such as wool.
  • a woven cloth is adopted as the base layer 11.
  • a basis weight of the base layer 11 is 550 g/m 2
  • a thickness of the base layer is 1.5 mm
  • a density of a fiber forming the base layer 11 is 0.367 g/cm 3 .
  • the batt layer 13 (the first batt layer 13A and the second batt layer 13B) is an ordinary fiber layer formed with staple fiber 17 having a fineness of 6 decitex (dtex) or more (generally, about 17 dtex) .
  • a basis weight of the batt layer 13 is 500 g/m 2 . More specifically, a basis weight of the first batt layer 13A is 400 g/m 2 , and a basis weight of the second batt layer 13B is 100 g/m 2 .
  • a thickness of the first batt layer 13A is 0.9 mm, and a density of staple fiber 17 forming the first batt layer 13A is 0.444 g/cm 3 .
  • a thickness of the second batt layer 13B is 0.4 mm, and a density of staple fiber 17 forming the second batt layer 13B is 0.250 g/cm 3 .
  • a material which forms the batt layer 13 a material similar to the base layer mat be used. Further, the second batt layer 13B may be omitted in accordance with a property requested for the papermaking felt 100.
  • the contacting layer 15 is made of a hydrophilic fiber (in other words, the amount of the hydrophilic fiber with respect to the contacting layer 15 is 100 % by weight) .
  • the hydrophilic fiber forming the contacting layer 15 is a fiber fibrillated into a plurality of small fibers by a press operation of a shoe press apparatus of the paper machine. It is preferable that a fineness of the hydrophilic fiber be 10 dtex or more. In the first embodiment, a fiber having a fineness of 6 dtex is used.
  • a main reason for using the hydrophilic fiber having the fineness of 10 dtex or more is to facilitate the forming of the contacting layer 15, more specifically, to form the contacting layer 15 such that the hydrophilic fiber is not fibrillated in a carding step or a needling step during the manufacturing process of the papermaking felt 100, and such that the hydrophilic fiber is fibrillated effectively by a press operation of a shoe press (the roll and the shoe) when the papermaking felt 100 is mounted on the press apparatus of the paper machine.
  • a basis weight of the contacting layer 15 is 100 g/m 2
  • a thickness of the contacting layer 15 is 0.20 mm
  • a density of the hydrophilic fiber forming the contacting layer 15 is 0.500 g/cm 3 .
  • an amount of the hydrophilic fiber with respect to the contacting layer 15 may be 15 % to 100 % by weight, while the rest of the contacting layer 15 is formed by a nonhydrophlic fiber.
  • the nonhydrophlic fiber is an ordinary fiber that does not fibrillate in the carding step or the needling step, further, even when pressed by the shoe press (namely, the roll and the shoe) .
  • a staple fiber having a fineness of, for example, 6 dtex (namely, the same fineness as the fineness of the hydrophilic fiber before being fibrillated) to 20 dtex be used as the ordinary fiber.
  • the fibrillation is a phenomenon in which a fibril (a micro fiber) inside a fiber emerges on a surface of the fiber and fluffs and splits finely by a friction.
  • the hydrophilic fiber a cellulose series fiber such as rayon, polynogic, cupro, cotton, hemp, silk or the like is preferable, among these, rayon is particularly preferable.
  • the hydrophilic means having at least one of a water attracting property or a water holding property.
  • a hydrophilic fiber there is a fiber having a hygroscopic property. In this case, when the fiber absorbs water, there is an affinity between the water and the fiber.
  • a standard moisture regain may be 4.0 % or more, preferably, 5.0 % or more.
  • the standard moisture regains of the above-mentioned hydrophilic fibers are, rayon 11.0 %, polynogic 11.0 %, cupro 11.0 %, cotton 8.5 %, hemp 12.0 %, silk 12.0 %.
  • the standard moisture regain is a numerical value calculated based on a calculating equation of "standard moisture regain" described in JIS L0105 (rule of physical test method of fiber product) .
  • a method of manufacturing the papermaking felt 100 will simply be explained.
  • the woven base layer 11 with the batt layers 13 integrated on each surfaces thereof with by needling is prepared.
  • the web sheet of the hydrophilic fiber, on which the carding is performed is mounted on a surface of the first batt layer 13A, the web sheet of the hydrophilic fiber, the batt layer 13 and the base layer 11 are penetrated by needles so as to be entwined and integrated so that the contacting layer 15 is formed.
  • a needle used for needling is provided with, for example, a boldness of 36 count, a barb number of 2 edges 6 barbs, a depth of the barb of substantially 0.1 mm, a diameter of a boldness of a tip of the needle of 0.04 mm, and by using the needle, needling is carried out by a needle depth of 7 to 16 mm with 650 needles/cm 2 .
  • the hydrophilic fiber can maintain the fineness of 6 dtex. Therefore, a fiber ' block which is produced when the carding is performed on a fibrillated fiber can be prevented. Further, The boldness of the needle tip portion (diameter of about 0.04 mm) and the depth of the barb (about 0.1 mm) are sufficiently larger relative to a diameter of the hydrophilic fiber of which is about 0.03 mm (a calculated value from the fineness of 6 dtex) , in other words, the hydrophilic fiber is very fine. Therefore, in piercing the needle in the needling step, the hydrophilic fiber is moved to escape from the needle tip and the needle is hardly pierced to the hydrophilic fiber.
  • the hydrophilic fiber which contacts with the barb, moves around the barb that is sufficiently larger relative to the boldness of the hydrophilic fiber, and is hardly fibrillated by the barb. Therefore, the contacting layer 15 (or the hydrophilic fiber) is not fibrillated even by the needling, and the contacting layer 15 having a smooth surface is provided while most of the fiber is kept in a bold state (6 dtex) .
  • a basis weight of the papermaking felt 100 manufactured in such way is 1150 g/m 2
  • a thickness of the papermaking felt 100 is 3.00 mm
  • a density of the fiber forming the papermaking felt 100 as a whole is 0.383 g/cm 3
  • a density of a total of fibers of plural layers excluding the contacting layer 15 is 0.375 g cm 3
  • basis weight thereof is 1050 g/m 2
  • a permeability of the papermaking felt 100 is 8 cc/cm 2 /sec (this is an average value of permeability measured by applying a pressure 125 Pa on a test piece of the papermaking felt 100 by a fragile method based on JIS L 1096) .
  • the contacting layer 15 is fibrillated into micro fibers by being pressed by the press operation of the roll and the shoe (shoe press) when mounted to the shoe press apparatus of the paper machine to travel .
  • the papermaking felt 100 having the contacting layer 15, a surface of which is smooth and covered with micro fibers, is formed.
  • the fibrillation be carried out in advance in a trial operation (so-called running in) of the shoe press apparatus of the paper maker such that the papermaking felt 100 is pressed by the roll and the shoe (the shoe press) while spraying water to the papermaking felt 100 with a shower (namely, cleaning means) and sucking the water soaked in the papermaking felt 100 by a suction box (namely, cleaning means) so that the fibrillation of the hydrophilic fiber is finished before actually making a paper.
  • a trial operation so-called running in of the shoe press apparatus of the paper maker such that the papermaking felt 100 is pressed by the roll and the shoe (the shoe press) while spraying water to the papermaking felt 100 with a shower (namely, cleaning means) and sucking the water soaked in the papermaking felt 100 by a suction box (namely, cleaning means) so that the fibrillation of the hydrophilic fiber is finished before actually making a paper.
  • kinds of respective fibers for the base layer 11, the batt layer 13, and the contacting layer 15 are pertinently selected in consideration of properties of the fiber alone or fibers combined together.
  • the papermaking felt 100 theremaybe a papermaking felt 100 having a contacting layer, in which an amount of a hydroph ' ilic fiber of 6 dtex is 50 % by weight and is the rest (namely, 50 % of the weight) is a nonhydrophlic fiber of 10 dtex.
  • an average boldness of the fibers forming the contacting layer becomes about 8 dtex.
  • the base layer 11 and the batt layer 13 are similar to those described above.
  • the papermaking felt 200 includes the base layer 11, the batt layer 13 (the first batt layer 13A and the second batt layer 13B) and the contacting layer 15, similarly to the papermaking felt 100.
  • the papermaking felt 200 differs from the papermaking felt 100 in that the papermaking felt 200 includes a hydrophilic nonwoven cloth layer 23 inside the first batt layer 13A provided between the base layer 11 and the contacting layer 15.
  • the second batt layer 13B is formed on the surface of the base layer 11 on the roll side or the shoe side
  • a first portion 13Aa of the first batt layer 13A is formed on the surface of the base layer 11 on the wet paper side
  • the hydrophilic nonwoven cloth layer 23 is formed on a surface of the first portion 13Aa of the first batt layer 13A on the wet paper side
  • a second portion 13Ab of the first batt layer 13A is formed on a surface of the hydrophilic nonwoven cloth layer 23 on the wet paper side
  • the contacting layer 15 is formed on a surface of the second portion 13Ab of the first batt layer 13A on the wet paper side so as to be brought into direct contact with the wet paper.
  • a basis weight of the papermaking felt 200 is 1350 g/m 2
  • a thickness of the papermaking felt 200 is 3.50 mm
  • a density of a total of fiber forming the papermaking felt 200 is 0.386 g/cm 3
  • a basis weight of the hydrophilic nonwoven cloth layer 23 is 50 g/m 2
  • a thickness of the hydrophilic nonwovoen cloth layer 23 is 0.1 mm
  • a density of a fiber forming the hydrophilic nonwoven cloth layer 23 is 0.500 g/cm 3 .
  • a density of total fibers of plural layers excluding the contacting layer 15 is 0.379 g/cm 3 , and the basis weight thereof is 1100 g/m 2 .
  • a permeability of the papermaking felt 200 formed in this way is 4 cc/cm 2 /sec (this value is an average value of permeability measured by applying a pressure of 125 Pa on a test piece of the papermaking felt 200 by a fragile method based on JIS L 1096) .
  • the contacting layer 15 may be formed on the surface of the hydrophilic nonwoven cloth layer 23 on the wet paper side without forming the second portion 13Ab of , the first batt layer 13A.
  • the hydrophilic nonwoven layer 23 is formed by a hydrophilic nonwoven cloth which is made to have a high density by laminating a fiber finer than a fiber forming the batt layer 13, for example, a fineness of 4 dtex or less.
  • the hydrophilic nonwoven cloth forming the hydrophilic nonwoven cloth layer 23 may be, for example, a span bond nonwoven cloth formed by laminating a fiber made by melting and spinning a resin such as nylon. Such fiber may be, for example, a continuous filament.
  • he hydrophilic nonwoven cloth forming the hydrophilic nonwoven cloth layer 23 may be a nonwoven cloth formed into a sheet-like shape by forming fine fiber. Such fine fiber may be made by elongating a polymer melted by hot wind.
  • the hydrophilic property of the hydrophilic nonwoven cloth layer 23 is set such that a contact angle of the hydrophilic nonwoven cloth layer 23 with respect to water becomes 30° or less when a moisture rate of the hydrophilic nonwoven cloth layer 23 is adjusted to be 30 % to 50 %.
  • the moisture rate of the hydrophilic nonwoven cloth layer 23 is calculated from (water weight/total weight of the hydrophilic nonwoven cloth layer 23) x 100.
  • a basis weight of papermaking felt is 1350 g/m 2
  • a thickness of the papermaking felt is 3.56 mm
  • a density of a total of fiber forming the papermaking felt is 0.379 g/cm 3
  • a basis weight of the base layer is 650 g/m 2
  • a thickness of the base layer is 1.7 mm
  • a density of a fiber forming the base layer is 0.382 g/cm 3
  • a basis weight of the batt layer formed by staple fiber 17 having a fineness of 3.3 dtex is 450 g/m 2 (more specifically, a basis weight of the first batt layer is 300 g/m 2 , and a basis weight of the second batt layer is 150 g/m 2 )
  • a thickness of the first batt layer is 0.8 mm
  • a density of staple fiber 17 forming the first batt layer is 0.375 g/cm 3
  • a density of total fibers of plural layers excluding the contacting layer is 0.359 g/cm 3 .
  • a permeability of the modified example of the papermaking felt 200 is 3 cc/cm 2 /sec.
  • a shoe press apparatus 300 of a paper machine mounted with the papermaking felt 100 and the papermaking felt 200, both formed in a shape of an endless belt (ring-like shape) .
  • the shoe press apparatus 300 of the paper machine is a press apparatus of a so-called closed draw type in which a first press mechanism 51 and a second press mechanism 53 are arranged in series along a direction of carrying wet paper W (along the direction of arrow A) .
  • the shoe press type paper machine of the closed draw type in which the wet paper W is carried and pressed in a state of being squeezed by a pair of the papermaking felts 100 and a pair of the papermaking felts 200, the wet paper W can stably be carried at high speed of, for example, 1200 m/min to 1400 m/min. Therefore, a paper can be made in an extremely high efficiency compared with, for example, a shoe press type paper machine of an open draw type.
  • the first press mechanism 51 includes a pair of the papermaking felts 100, and a first shoe 55 and a first roll 57 (in other words, a first shoe press) which are arranged so as to face each other so that a first nip (in other words, a first press portion) is formed therebetween.
  • the second press mechanism 53 includes a pair of the papermaking felts 200, and a second shoe 59 and a second roll 61 (in other words, a second shoe press) which are arranged so as to face each other so that a second nip (in other words, a second press portion) is formed therebetween .
  • the papermaking felts 100 may be adopted as the upper and the lower papermaking felts of the first press mechanism 51. However, the papermaking felt 100 may be adopted for one of the upper papermaking felt or the lower papermaking felt. When the papermaking felt 100 is employed as one of the upper papermaking felt or the lower papermaking felt of the first press mechanism 51, an arbitrary papermaking felt may be adopted for the other papermaking felt in accordance with a characteristic of a paper.
  • the papermaking felts 200 may be adopted as the upper and the lower papermaking felts of the second press mechanism 53.
  • the papermaking felt 200 may be adopted for one of the upper papermaking felt or the lower papermaking felt.
  • an arbitrary papermaking felt may be adopted for the other papermaking felt in accordance with a characteristic of the paper.
  • papermaking felts 100 or only the papermaking felts 200 may be adopted as the papermaking felts of both the first press mechanism 51 and the second press mechanism 53.
  • the papermaking felt 100 or only the papermaking felt 200 may be adopted as the papermaking felt of the second press mechanism 53.
  • an arbitrary papermaking felt may be adopted for the papermaking felt of the first press mechanism 51 in accordance with a characteristic of the paper.
  • the hydrophilic fibers of the contacting layer 15 of the papermaking felt 100 and the hydrophilic fibers of the contacting layer 15 of the papermaking felt 200 are fibrillated. That is, the respective contacting layers 15 (namely, the hydrophilic fibers) are fibrillated to become micro fibers by being pressed when passing between the first shoe 55 and the first roll 57, and further between the second shoe 59 and the second roll 61. Also, the surfaces of the papermaking felts 100, 200 on the wet paper side become smooth.
  • a pressing condition of the papermaking felt 100 by the first shoe 55 and the first roll 57 is 800 kN/m
  • a pressing condition of the paper carrying felt 200 by the second shoe 59 and the second roll 61 is 1050 kN/m
  • a shoe width is 10 inches both for the first shoe 55 and the second shoe 59, and respective traveling speeds of the papermaking felt 100 and the papermaking felt 200 are 1700 m/min.
  • the wet paper W carried out from a wire part (not illustrated) and delivered to the first press mechanism 51 is nipped' by the pair of papermaking felts 100 and carried, while water is squeezed out by pressing the wet paper W by the first shoe 55 and the first roll 57, and the squeezed-out water is absorbed by the papermaking felt 100.
  • the wet paper W is delivered to the second press mechanism 53 and nipped by the pair of papermaking felts 200 and carried, while water is further squeezed out by being pressed by the second shoe 59 and the second roll 61, and the squeezed-out water is absorbed by the papermaking felt 200.
  • a surface of the wet paper W brought into contact with the contacting layer 15 is smoothed, and the wet paper W is delivered to a drier part (not shown) to be dried.
  • the re-wetting phenomenon in which the water inside the papermaking felt 200 moves to the wet paper W side may occur.
  • the density of the hydrophilic nonwoven cloth layer 23 is higher than that of the batt layer 13, and a permeability thereof is lower than that of the batt layer 13. Therefore, the water contained in the second batt layer 13B arranged on the second shoe 59 side or the second roll 61 side of the hydrophilic nonwoven cloth layer 23 is difficult to be moved to the second portion 13Ab of the first batt layer 13A on the wet paper side by permeating the hydrophilic nonwoven cloth layer 23.
  • the re-wetting phenomenon is prevented from being brought about. Further, since the fineness of the hydrophilic nonwoven cloth layer 23 is lower than the fineness of the batt layer 13, the water contained in the second portion 13Ab of the first batt layer 13A arranged on the wet paper side of the hydrophilic nonwoven cloth layer 23 is moved to and held by the hydrophilic nonwoven cloth layer 23 by the capillary phenomenon. Therefore, the re-wettting phenomenon can effectively be prevented.
  • a press apparatus may include a single press mechanism or a press apparatus may include a plurality of press mechanisms aligned in series.
  • the contacting layer 15 including the hydrophilic fiber fibrillated into micro fibers by being pressed by the shoe presses namely, rolls (57; 61) and shoes (55; 59)
  • the shoe presses namely, rolls (57; 61) and shoes (55; 59)
  • the contacting layer 15 including the hydrophilic fiber of micro fibers having an extremely low fineness by being fibrillated the smoothness of the surface of the wet paper W can be promoted.
  • stain specifically, a component of an additive, a glue or the like included in the wet paper W adhered temporarily to the papermaking felt (100; 200) is fallen off by a so-called unhairing phenomenon of micro fibers formed fibrillation of the hydrophilic fiber from the papermaking felt (100; 200) along with the micro fibers . Therefore, the stain is difficult to remain in the papermaking felt (100; 200) . Even when micro fibers (namely, small fibers formed by fibrillation of the hydrophilic fiber) are more or less adhered to the surface of the wet paper W by being fallen off or cut off from the contacting layer 15, since the micro fibers are extremely fine, the micro fibers do not deteriorate the quality of the wet paper W.
  • micro fibers namely, small fibers formed by fibrillation of the hydrophilic fiber
  • the stain partially shifted to the wet paper by falling off of the micro fibers formed by the fibrillation is included inherently in the wet paper W as a component thereof. Therefore, the stain does not affect any influence on the quality of the wet paper W at all.
  • the surface of the paper fabricated by the shoe press type paper machine using the papermaking felt (100; 200) become extremely smooth, and a service life of the papermaking felt (100; 200), that is, a time period of capable of using the papermaking felt is prolonged. Therefore, there can be reduced a frequency of maintenance of interchanging the papermaking felt (100; 200) by a new one or cleaning the papermaking felt in the midst of making the paper or the like. Therefore, it is preferable that the hydrophilic fiber is included at at least the surface of the press paper contact fiber layer 15 where the wet paper W comes into contact.
  • the shoe press apparatus 300 of the paper machine when the papermaking felt 100 is arranged at the press mechanism 51 arranged on the upstream side in the direction A of carrying the wet paper W in the plurality of press mechanisms 51, 53, the arrangement is particularly preferable in view of squeezing out water efficiently from the wet paper W. That is, according to the shoe press apparatus 300 of the paper machine having such constitution, a large amount of water can effectively be squeezed out from the wet paper including much water, thereby, providing the papermaking felt (100; 200) with an excellent paper separating function in delivering the wet paper. Therefore, paper making operation can be carried out at high speed.
  • the hydrophilic nonwoven cloth layer 23 is provided between the base layer 11 and the contacting layer 15. Therefore, reshifting of the water absorbed temporarily from the wet paper W to the papermaking felt 200 (namely, so-called re-wetting phenomenon) is hampered by the hydrophilic nonwoven cloth layer 23.
  • the shoe press apparatus 300 of the paper machine when the papermaking felt 200 is arranged to the press mechanism 53 arranged on the downstream side in the direction A of carrying the wet paper W in the plurality of press mechanisms 51, 53, although there is conceivable a case in which a water permeating function becomes slightly lower than that of the papermaking felt 100, since the papermaking felt 200 is provided with not only the function of smoothing the surface of the wet paper but also function of highly preventing re-wetting, the papermaking felt 200 is particularly preferable in view of preventing the re-wetting phenomenon and in view of smoothing the surface of the wet paper .
  • the respective finenesses of the hydrophilic fibers before the fibrillation is 10 dtex more less, even when the fineness of' the hydrophilic fiber before fibrillation is ass ⁇ medly 10 dtex, the fineness of the small fiber formed by subjecting the hydrophilic fiber to fibrillation becomes smaller than 10 dtex. Therefore, when there is formed the contacting layer 15 including the hydrophilic fiber for constituting the micro fiber having the fineness as proximate to the fineness of the fiber of the wet paper W as possible, high quality paper excellent in surface smoothness can bemanufactured. It is further preferable when the respective finenesses of the hydrophilic fibers before the fibrillation is smaller such as 6 dtex.
  • the property of the papermaking felt (100; 200) can be changed by pertinently changing a weight rate of the hydrophilic fiber.
  • the weight rate of the hydrophilic fiber is defined by "weight of hydrophilic fiber/ (weight of hydrophilic fiber + weight of nonhydrophilic fiber) x 100".
  • the surface smoothness and the water squeeze out property which are properties required for the papermaking felt (100; 200) are in an inversely proportional relationship, and when a density of the papermaking felt (100; 200) is increased in order to promote the function of smoothing the surface of the wet paper W, the water squeeze out property tends to be deteriorated.
  • the press apparatus 300 of the shoe press type paper machine since the press apparatus 300 is the press apparatus of the closed draw type, the wet paper W is carried in the state of being squeezed by the pairs of the papermaking felts (100; 200) for the shoe presses. Thereby, the wet paper W is not elongated (under no draw) , and the wet paper W can be carried at an extremely high speed. Therefore, paper can be made efficiently.
  • the hydrophilic fiber used in the papermaking felt (100; 200) be a fiber that is fibrillated by being pressed by the shoe press, but not fibrillated and maintains a comparatively bold state in the carding step or the needling step during the manufacturing of the papermaking felt.
  • a fiber block is easy to be produced when the hydrophilic fiber which is fibrillated into micro fibers is assumedly carded in carding.
  • Such fiber block is implanted to the felt in the needling step and forms recesses and projections at the surface of the papermaking felt. Therefore, the surface smoothness of the wet paper is deteriorated.
  • Such a drawback can be overcome by using the contacting layer 15 including the hydrophilic fiber which is fibrillated into micro fibers by being pressed by the shoe press.
  • the invention is not limited to the embodiments and the modified examples but can pertinently be modified, improved or the like.
  • Materials, shapes, dimensions, numerical values, modes, numbers, arranging locations and the like of respective constituents elements in the embodiments and the modified examples are arbitrary and not limited so far as the invention can be achieved thereby.
  • the papermaking felt (100; 200) is mounted on a shoe press type paper machine of an open draw type having a portion in which a single one of the wet paper W is carrie ' d in the midst of carrying the wet paper W, the papermaking felt (100; 200) is similarly operated effectively .
  • the invention is not limited thereto, and the invention may be applied to a press apparatus of a roll press type paper machine having a pair of rolls for pressing the papermaking felt.
  • the present invention provides a papermaking felt from which stain is easy to fall off, and has an excellent function of smoothing a surface of wet paper and also an excellent paper separating function in delivering the wet paper, and further provides a shoe press apparatus of a paper machine having such papermakmg felt.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne un feutre de machine à papier (100) qui comprend une couche de support (11), une première couche de natte (13A) formée sur une surface de la couche de support sur un côté papier mouillé, et une couche de contact (15) incorporée formée sur une surface de la première couche de natte côté papier mouillé à l'endroit où le papier mouillé vient en contact avec elle. Selon l'invention, la couche de contact incorpore une fibre hydrophile, et la fibre hydrophile est fibrillée en étant pressée par un rouleau et un sabot.
PCT/JP2006/320426 2005-10-07 2006-10-06 Feutre de machine a papier et appareil de presse a sabot WO2007043632A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06811714A EP1957710A1 (fr) 2005-10-07 2006-10-06 Feutre de machine a papier et appareil de presse a sabot

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-295256 2005-10-07
JP2005295256A JP4712508B2 (ja) 2005-10-07 2005-10-07 シュープレス用の抄紙搬送フェルトおよび該抄紙搬送フェルトを備えたシュープレス型抄紙機のプレス装置

Publications (2)

Publication Number Publication Date
WO2007043632A1 WO2007043632A1 (fr) 2007-04-19
WO2007043632A9 true WO2007043632A9 (fr) 2007-06-07

Family

ID=37494396

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/320426 WO2007043632A1 (fr) 2005-10-07 2006-10-06 Feutre de machine a papier et appareil de presse a sabot

Country Status (5)

Country Link
EP (1) EP1957710A1 (fr)
JP (1) JP4712508B2 (fr)
CN (1) CN101268231A (fr)
TW (1) TW200728554A (fr)
WO (1) WO2007043632A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6095287B2 (ja) * 2012-07-02 2017-03-15 日本フエルト株式会社 製紙用プレスフェルトの製造方法
CN112176760A (zh) * 2020-10-14 2021-01-05 玖龙纸业（东莞）有限公司 一种成型机构、包装纸抄造系统及高档包装纸

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3187942B2 (ja) * 1992-05-23 2001-07-16 日本フエルト株式会社 抄紙用フエルト及びその製造方法
US5325837A (en) * 1992-11-19 1994-07-05 Robert Bosch Gmbh Fuel injection apparatus for internal combustion engines
GB9726722D0 (en) * 1997-12-18 1998-02-18 Scapa Group Plc Papermaking fabric surface structure
JP4102644B2 (ja) * 2002-10-24 2008-06-18 イチカワ株式会社 抄紙用プレスフェルト及び抄紙機用プレス装置
JP4480006B2 (ja) * 2004-08-10 2010-06-16 イチカワ株式会社 シュープレス用の抄紙搬送フェルトおよび該抄紙搬送フェルトを備えたシュープレス型抄紙機のプレス装置

Also Published As

Publication number Publication date
JP2007100277A (ja) 2007-04-19
WO2007043632A1 (fr) 2007-04-19
TW200728554A (en) 2007-08-01
JP4712508B2 (ja) 2011-06-29
EP1957710A1 (fr) 2008-08-20
CN101268231A (zh) 2008-09-17

Similar Documents

Publication Publication Date Title
JP3184927B2 (ja) 増大した接触面を有する製紙用ファブリック
US5232768A (en) Wet press fabric to be used in papermaking machine
EP2692921A1 (fr) Procédé de fabrication pour tissu non-tissé
JP4102644B2 (ja) 抄紙用プレスフェルト及び抄紙機用プレス装置
CN1854391A (zh) 脱水织物
US8262862B2 (en) Felt for papermaking
JP4627137B2 (ja) 湿紙搬送用ベルト
JP4524246B2 (ja) 湿紙搬送用ベルト
WO2007043632A9 (fr) Feutre de machine a papier et appareil de presse a sabot
EP2213788B1 (fr) Courroie de transfert pour bande de papier humide
US4882217A (en) Needled press felt
US20070240844A1 (en) Paper Transporting Felt and Press Apparatus of Paper Machine Having the Paper Transporting Felt
US20080073052A1 (en) Paper Transporting Felt for Shoe Press, and Press Apparatus of Shoe Press Type Paper Machine having the Paper Transporting Felt
KR20060055396A (ko) 초지반송펠트 및 상기 초지반송펠트를 구비한 초지기의프레스 장치
EP0987366A2 (fr) Feutre de presse à essorage amélioré
CA1317144C (fr) Feutre presseur aiguillete
EP3359379B1 (fr) Procédé de fabrication de tissus de nettoyage pour cylindres d'impression
JP6162464B2 (ja) 製紙用フェルトの製造方法
WO2000052263A1 (fr) Toile de transfert

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200680034167.3

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2006811714

Country of ref document: EP

NENP Non-entry into the national phase in:

Ref country code: DE