JPH0734000U - Paper making dryer canvas - Google Patents

Abstract

(57) [Summary] [Purpose] Due to the difference in thermal characteristics and dry heat shrinkage between the two types of monofilaments that form warp and weft, there is a problem of non-uniform shrinkage in the papermaking dryer canvas after heat setting. To prevent the occurrence of heat, and to make products that could not be made in the past into products.As a result, heat deterioration of the ears is prevented, life is improved and the surface smoothness of the canvas is also improved. Improve. [Constitution] Polyphenylene sulfide (P) is used as a part of the main forming material of the ear of the papermaking dryer canvas (1).
PS) multifilament (6A) (6B) draw yarn, plied yarn, or any one of the sheath core yarn containing the above multifilament as a sheath component, or a warp yarn (6) or a combination yarn thereof. Use weft (5 ').

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dryer canvas for papermaking, and more particularly to a means for preventing thermal deterioration of the ears of a dryer canvas for papermaking.

[0002]

[Prior art]

 Synthetic fiber yarns such as polyethylene terephthalate (PET) and polypropylene (PP) are usually used for a papermaking dryer canvas used in the dryer part of a paper machine. By the way, recently, along with the speeding up of paper machines and the promotion of energy saving measures, the trend of total sealing of hoods and high dew point operation has become stronger, and the conditions of the dryer part have become more severe. More specifically, as the vapor pressure of the dryer part is set higher due to the higher speed of the paper machine, the dryer canvas for papermaking is thermally deteriorated in a relatively short time by being exposed to high temperature steam. There is a problem that is progressing. In particular, since both ends of the dryer canvas are directly exposed to high-temperature steam, it is unavoidable that the rate of progress of heat deterioration will be much faster than in the central part where the wet paper is present on the surface. Therefore, the forming material of the ear part of the dryer canvas, which does not have a wet paper on the surface and is in direct contact with the surface of the heated dryer, is made of polyethylene terephthalate (PET) or polypropylene (PP), which is more heat and moisture resistant. It has been proposed to consist of monofilament yarns such as high aromatic aramid fibers or polyphenylene sulfide (PPS) fibers. For example, Japanese Utility Model Laid-Open No. 63-60499 discloses a high heat resistant synthetic resin such as polyphenylene sulfide (PPS) or polyethylene ether ketone (PEEK) on at least a part of the warp forming the ear of a dryer canvas for papermaking. It is described to use monofilaments of.

[0003]

[Problems to be solved by the device]

 As described in the publication of the above-mentioned prior application, polyphenylene sulfide (PPS) monofilament yarn is used only in the ear portion of the papermaking dryer canvas, and polypropylene (PP) or polyethylene tere By using monofilament yarn of phthalate (PET), the dryer canvas for papermaking can be manufactured by increasing the moist heat resistance to a predetermined level and at the same time reducing the amount of monofilament yarn such as polyphenylene sulfide (PPS) used. It is possible to keep the rise in manufacturing costs to a minimum.

By the way, when polyphenylene sulfide (PPS) monofilament yarn as a reinforcing component is aligned or plied into a monofilament or multifilament of a synthetic fiber which is a constituent of a warp to produce a canvas body, polyphenylene sulfide (PPS) is used. Since the monofilament yarn of) has lower raw yarn strength than the monofilament or multifilament of the main body of the dryer canvas, as shown in Fig. 7, the strength of only the ears decreases when finished as a dryer canvas. was there.

[0005]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention relates to a dryer canvas for papermaking that uses a monofilament or a multifilament of synthetic fiber for a warp, and at least a part of the selvage warp is aligned with a polyphenylene sulfide multifilament, The present invention provides a dryer canvas for papermaking, which is characterized in that it is composed of a ply-twisted yarn, or any one of a sheath-core yarn containing the above-mentioned multifilament as a sheath component, or a combination yarn thereof. Further, the present invention relates to a dryer canvas for papermaking, which uses synthetic fiber monofilaments or multifilaments for warp and weft, in which at least a part of the weft is aligned with polyphenylene sulfide multifilament, or a plied yarn. Or a sheath core yarn containing any of the above-mentioned multifilaments as a sheath component, or a combination yarn thereof, to provide a dryer canvas for papermaking. Further, the present invention provides a dryer canvas for papermaking that uses a monofilament or multifilament made of synthetic fiber for both warp and weft, and at least a part of the selvage warp or at least a part of the weft, or both. The warp yarn and the weft yarn are composed of either an aligned yarn with polyphenylene sulfide multifilament, a plied yarn, or a sheath core yarn containing the above multifilament as a sheath component, or a combination yarn thereof. A web of high heat-resistant fiber selected from the group consisting of aramid fiber, polyphenylene sulfide fiber, polyether ether ketone fiber or a mixture of these fibers was needling on the base fabric for dryer canvas obtained by weaving. A characteristic dry paper canvas for papermaking It is intended to provide.

[0006]

[Action]

 At least a part of the warp yarns or at least a part of the weft yarns or both of the weft yarns used in the selvages of the papermaking dryer canvas are aligned with a multifilament yarn of polyphenylene sulfide (PPS), a plied yarn, or the above multifilament. It is possible to make the dryer canvas as a product without deteriorating the initial strength by constructing it from any one of the sheath-core-yarn having the ment yarn as the sheath component, or a combination of these yarns. Prevents thermal deterioration of parts and improves the service life. In addition, a web of high heat-resistant fibers may be needling on the base fabric for a dryer canvas obtained by weaving the above warp and weft to improve the smoothness with the paper.

[0007]

【Example】

 Several embodiments of the present invention will be described below with reference to FIGS. 1 to 6 and 8 to 14.

In the papermaking dryer canvas (1) shown in FIG. 1, the central portion (2) in the width direction is made of polypropylene (PP) monofilaments (4) and polypropylene (PP) monofilaments. With (5), the ears (3) at both ends are warps (4) consisting of polypropylene (PP) monofilaments, and polypropylene (PP) monofilaments and polyphenylene sulfide (PPS) multifilaments (6A). The warp yarns (6) made of aligned yarns and the weft yarns (5) made of polypropylene (PP) monofilaments are woven in a triple weave design as shown in FIG. The warp yarn (6) used for the selvage part (3) is made of polyphenylene sulfide (PPS) multifilament (6A), in addition to the above-mentioned aligned yarn, from the viewpoint of improving the heat and moisture resistance. It is formed from a single aligned yarn, a plied yarn, or a sheath core yarn containing the multifilament (6A) as a sheath component.

In FIG. 1, polypropylene (PP) is used for the warp yarn (4) and the weft yarn (5) of the widthwise central portion (2), but other synthetic fibers are used. Alternatively, a multifilament may be used instead of the monofilament. At this time, the same applies to the warp threads (6) of the selvage (3) as to the same constituent threads as the warp threads (4) of the central portion (2) in the width direction.

FIG. 2 is a cross-sectional view of the selvage portion (3) of FIG. 1 in the warp direction. In this papermaking dryer canvas (1), the constituent yarn of the selvage portion (3) is polypropylene (PP). A warp (4) made of a monofilament, and a warp (6) made of a polypropylene (PP) monofilament yarn (4 ') and a polyphenylene sulfide (PPS) multifilament (6A). Is used. Incidentally, the polyphenylene sulfide (PPS) multifilament (6A) can be used as a warp (6) for reinforcing the selvage (3) even in a shape other than the aligned yarn. Fig. 3 shows this specific example, in which the multifilament (6B) of polyphenylene sulfide (PPS) is provided on the warp (6) of the selvage of the paper making dryer canvas (1) woven in the double woven structure. It is used as a covering component for compound yarns or sheath core yarns. When used as a sheath core yarn, as shown in FIG. 6, for example, the polyphenylene sulfide (PPS) multifilament (6B) is covered around the core yarn (12) made of polyester monofilament (13). By winding as a (sheath component), the warp (6) for reinforcing the ears can be formed.

2 and 3, the warp yarn (6) of the selvage portion (3) of the dryer canvas for papermaking (6) has a multifilament yarn (6A) or (6B) of polyphenylene sulfide (PPS), Although an example using a twisted yarn or a sheath core yarn is shown, the weft yarn (5) of the selvage (3), which is in direct contact with the surface of the heated dryer, is similar to the above warp yarn (6). A thermal deterioration phenomenon occurs. Since the weft (5) is driven with a predetermined weaving density over the entire width of the warp row of the papermaking dryer canvas (1), the above polyphenylene sulfide (PPS) multifilament is used as a conventional weft, for example, polypropylene (PP). When the weft yarn (5) consisting of the monofilament is used instead of the weft yarn (5), at least a part of the weft yarn (5) is composed of polyphenylene sulfide (PPS) multifilament (5 '). More specifically, all of the wefts (5) may be composed of polyphenylene sulfide (PPS) multifilaments (5 ′), but in order to reduce the manufacturing cost, polypropylene (PP) is formed at a predetermined interval. Of polyphenylene sulfide (PPS) multifilaments (5 ') to the warp rows (4) and (6) so that the polyphenylene sulfide (PPS) multifilaments (5') are scattered in the weft row of Adjust the driving position and the number of driving. When polyphenylene sulfide (PPS) multifilaments (5 ') are used as the constituent filaments of the weft (5), as with the warp (6) shown in Figs. It is used in the form of twisted yarn or sheath component of sheath core yarn.

The blending amount of the multifilament made of polyphenylene sulfide (PPS) depends on the wet heat resistance and the strength / elongation property required for the warp and the weft forming the selvage (3). Adjust the ratio of the number of warp and weft threads appropriately.

When the use conditions of the papermaking dryer canvas (1) are severe and particularly high resistance to moist heat is required, the warp forming the selvage (3) and all the wefts driven into the warp row are set to the above. It is composed of polyphenylene sulfide (PPS) multifilaments. In addition, the warp (6) and the weft (5 ′) are not aligned yarns, plied yarns, or sheath core yarns of polypropylene (PP) monofilament yarns and polyphenylene sulfide (PPS) multifilaments, and are made of polyphenylene. You may use what was comprised only with the multifilament of sulfide (PPS).

On the other hand, FIG. 4 and FIG. 5 show another embodiment of the present invention in which most of the warp threads (6) forming the selvage (3) and at least a part of the weft thread (5). A double woven base fabric (11) using polyphenylene sulfide (PPS) multifilaments (5 ′) (6A) is used, and a web is kneaded on both the front and back surfaces or the surface of the base fabric (11). A ringed papermaking dryer canvas (10) is illustrated. In FIG. 4, the core yarn (7) is woven in the base fabric (11) of the dryer canvas (10) woven in the double woven structure, and the core surface (7) is woven into the dryer canvas (10) and the dryer. On the paper-contacting side of the, high heat resistant fibers such as aramid fiber, polyphenylene sulfide fiber, polyether ether ketone fiber, or a web of high heat resistant fiber (8A) (8B) made of a mixture of these fibers. Are laminated and are integrated with the above-mentioned base cloth by needling. On the other hand, in the papermaking dryer canvas (10) shown in FIG. 5, the web (8A) of the high heat resistant fiber is kneaded only on the papermaking side in order to improve the smoothness of the papermaking. The thickness dimension and the fiber lamination density of the web layer made of the high heat resistant fiber are appropriately adjusted according to the smoothness of the paper to be produced and the temperature condition of the dryer.

FIGS. 8 to 14 show a concrete embodiment of the present invention. First, FIG. 8 shows a case of a double weave drier canvas, in which the warp threads (6) of the selvage (3) are formed. Part of the (warp order 1, 3, 4, 6), a twisted yarn (S twist, 9.0T / 2.54cm) of polyphenylene sulfide multifilament (PPS200D / 5 filaments) and polyester monofilament (TM040) Use the same polyester monofilament (TM040) as the warp of the main body (center, the same below) for the other warp, and use polyester monofilament (TM050) for the weft (5) for both the selvage and the main body. is doing. The specific specifications are as shown in FIG.

FIG. 9 shows a case of a dryer canvas having a triple weave design, and most of the warp threads (6) of the selvage portion (3) (warp order 1, 6, 2, 7, 3, 3, 8, 4, 9). In addition, using polyphenylene sulfide multifilament (PPS200D / 2/3, lower twist S: 11.0, upper twist Z: 6.0, T / 2.54cm) and polypropylene monofilament (PM050) aligned yarn, In addition, the reinforcing core yarns (5) and (10) are inserted along the warp direction in the center portion of the selvage (3) and the triple weave fabric of the main body, and the polypropylene monofilament (PM050 ), Polypropylene monofilament (PMO60) is used as the wefts for the surface layer and the back layer, and polyester threads (T10S / 3) are used as the wefts for the middle layer. , Twist S: 4.5T / 2.54cm) is used. The specific specifications are as shown in Fig. 9.

FIG. 10 shows a case of a dryer canvas having a double woven structure, in which the warp (6) of the selvage (3) is entirely made of polyester multifilament (T250D / 3) and polyphenylene sulfide multifilament (PPS200D / 1) with a twisted yarn (three twisted yarn, lower twist S: 7.0, Z4.0, upper twist Z: 7.0S4.0, T / 2 2.54 cm), and polyester as the warp of the main body Using yarn (T250D / 4/3, lower twist: S, Z7.0, upper twist: Z, S4.0, T / 2.54 cm), polyester monofilament (TM050 ) And polyester multifilament (T1500D / 1 + T1500D / 1) twisted yarn (SS230T / M) is used as the back weft and polyester monofilament Twisted yarn (ZZ350T / M) of Toru (TM050), Elder (Toray Industries Inc., trade name of nylon-based heat-adhesive fiber: ELD300D / 1) and acrylic multifilament (ACK3.5S / 1 + ACK3.5S / 1) Are using. The specific specifications are as shown in FIG.

FIG. 11 shows a case of a dryer canvas having a double weave structure, and the following five combinations are collectively described. 1) Ear warp: PPS200D / 3/3 weft: PPS200D / 7/4 2) Ear warp: PPS200D / 3/3 weft: (PPS200D / 3 + D800D / 1) / 4 3) Ear warp: (D200D / 1 + PPS200D / 2) / 3 weft: PPS200D / 7/4 4 ) Ear warp: (D200D / 1 + PPS200D / 2) / 3 weft yarn: (PPS200D / 3 + D800D / 1) / 4 5) Ear warp: (D200D / 1 + PPS200D / 2) / 3 weft yarn: (PO045 + PPS1500D / 1 + PPS1500D / 1) However, D: Delaron; a trade name of Bayer AG, acrylic fiber, and other symbols are the same as described above. The configurations of the five main body portions of the canvas are as shown in FIG. Since the weft in this case is the same as the weft of FIG. 11, only the structure of the warp is shown. Specific specifications are as shown in FIGS. 11 and 12.

FIG. 13 shows the case of a dryer dryer for papermaking with a triple weave design, in which polyphenylene sulfide multifilament (PPS200D / 6/3) is used for a part of the warp yarns of the selvage (warp sequence 4, 8). , The other warps in the selvage (the warp order 1, 2, 3, 5, 7) are twisted yarns of the Delaron multifilament and the polyester multifilament {(D800D / 1 + T250D / 1) / 3} is used as the weft yarns for the surface layer and the back layer of the ears and the main body, and twisted yarns of acrylic, polyester and nylon multifilaments {(ACK200D / 2 + T250D / 2 + N210D / 2) / 4 }, And a polyester yarn (T10S / 5) is used as the weft yarn of the middle layer. The specific specifications are as shown in FIG.

FIG. 14 shows an example of a needle canvas in which 100% of Nomex (NOX: brand name: aramid fiber) webs are laminated on both sides of a base fabric having a double woven structure as shown in FIG. In this case, polyphenylene sulfide multifilament (PPS200D / 2/3) is used for a part of the warp threads of the base cloth in this case, and polypropylene monofilament (PPS200D / 2/3) is used for the other warp threads as in the case of the main body. M050) and polypropylene monofilament (PM046) is used as the core yarn in the warp direction for the main body and the ears. Polypropylene monofilament (PM060) is used for the weft thread in the main body and the selvage. However, as a reinforcing specification for the polyphenylene sulfide multifilament used for a part of the above-mentioned warp of the selvage, the warp indicated by the circles in the order shown in the figure can be replaced, and the warp of other selvages can be replaced. It is similar to the main body. The specific specifications are as shown in FIG.

[0021]

[Effect of device]

 The ear (3) of the papermaking dryer canvas (1) that is in direct contact with the surface of the high-temperature dryer has the warp (6) and the weft (5) whose main component is polyphenylene sulfide (PPS) multifilament (6A) (6B). By forming it with '), a remarkable effect is exhibited in the improvement of the moisture heat resistance of the dryer canvas (1). Further, when weaving the dryer canvas for papermaking (1), the forming material of the warp and the weft is composed of monofilament or multifilament of synthetic fiber and multifilament (5 ') (6A) (6B) of polyphenylene sulfide (PPS). As a result, heat deterioration of the ears can be prevented, and the service life is improved.

Further, by stacking a web of high heat-resistant fibers on the surface of the papermaking dryer canvas (1) and performing a needling process, heat energy can be easily transferred to the papermaking machine and productivity can be improved. Also, a remarkable effect is exhibited for improving the smoothness of the surface of the papermaking paper.

[Brief description of drawings]

FIG. 1 is a plan view of a dryer canvas for papermaking.

FIG. 2 is a longitudinal cross-sectional view in the warp direction of a paper making dryer canvas selvage woven in a triple weave design.

FIG. 3 is a longitudinal cross-sectional view in the warp direction of a papermaking dryer canvas selvage portion having a double woven structure.

FIG. 4 is a longitudinal cross-sectional view in the warp direction of the ear portion of a dryer for papermaking in which webs of high heat-resistant fibers are needling laminated on both front and back surfaces.

FIG. 5 is a longitudinal cross-sectional view in the warp direction of the ear portion of a dryer for papermaking in which a web of high heat-resistant fibers is needling laminated on the paper contact surface side.

FIG. 6 is a sectional view of a sheath core yarn.

FIG. 7 is a structural explanatory view showing a conventional technique.

FIG. 8 is a structural diagram of the double-woven canvas of the present invention.

FIG. 9 is a structural diagram of a triple-woven canvas of the present invention.

FIG. 10 is a structural diagram of the double-woven canvas of the present invention.

FIG. 11 is a structural diagram of five ways of reinforcing the ear warp and the weft of the double-woven canvas of the present invention.

FIG. 12 is a structural diagram of the main body of the five canvases in FIG.

FIG. 13 is a structural diagram of the triple-woven canvas of the present invention.

FIG. 14 is a structural diagram of the needle canvas of the present invention.

[Explanation of symbols]

1 Dryer canvas for papermaking 2 Central part of dryer canvas 3 Ear of dryer canvas 4 Warp yarn made of polypropylene monofilament 5 Weft yarn made of polypropylene monofilament 5'Weft yarn made of multifilament of polyphenylene sulfide 6 Warp yarn 6A Polyphenylene sulfide multifilament 6B Polyphenylene sulfide Multifilament 7 Warp for reinforcement 8A Web of high heat resistant fiber 8B Web of high heat resistant fiber 10 Dryer canvas for papermaking 11 Base cloth PPS Polyphenylene sulfide PP polypropylene

Claims (3)

[Scope of utility model registration request] 1. A dryer canvas for papermaking, which comprises a synthetic monofilament or multifilament as a warp, wherein at least a part of the selvage warp is aligned with a polyphenylene sulfide multifilament, a plied yarn, or the above multifilament. A dryer canvas for papermaking, characterized in that it is composed of any one of a sheath, core and yarn having a filament as a sheath component, or a combination yarn thereof. 2. A dryer canvas for papermaking using monofilaments or multifilaments of synthetic fibers as warp and weft, wherein at least a part of the weft is aligned with a multifilament of polyphenylene sulfide, a plied yarn, or the above. 2. The papermaking dryer canvas according to claim 1, which is composed of any one of sheath-core yarns having a multifilament as a sheath component, or a combination yarn thereof. 3. In a dryer canvas for papermaking, which uses a monofilament or multifilament of synthetic fiber for both the warp and both the warp and the weft, at least a part of the selvage warp or at least a part of the weft is used.
Alternatively, the warp yarn and the weft yarn are composed of either an aligned yarn with a polyphenylene sulfide multifilament, a plied yarn, or a sheath core yarn containing the multifilament as a sheath component, or a combination yarn thereof. The base fabric for the dryer canvas obtained by weaving, aramid fiber, polyphenylene sulfide fiber,
The dryer canvas for papermaking according to claim 1 or 2, wherein a web of high heat-resistant fibers selected from the group of polyether ether ketone fibers or a mixture of these fibers is needling.