CN1069369C

CN1069369C - Papermakers fabric

Info

Publication number: CN1069369C
Application number: CN95194898A
Authority: CN
Inventors: M·霍德森
Original assignee: Voith Factory Haidenhaimu & Co Ltd GmbH
Current assignee: Voith Factory Haidenhaimu GmbH & Co., Ltd.
Priority date: 1994-09-03
Filing date: 1995-08-24
Publication date: 2001-08-08
Anticipated expiration: 2015-08-24
Also published as: DE69506118T2; KR100398475B1; TW360724B; WO1996007789A3; EP0778910B1; FI108740B; JPH10505138A; ES2126928T3; PL178196B1; AU686006B2; FI970826A0; DE69506118D1; GB9417720D0; ATE173519T1; PL318886A1; EP0778910A2; WO1996007789A2; KR970704934A; CN1157017A; FI970826A

Abstract

A papermakers fabric (10) is woven from machine direction yarns (11, 19, 20) and one or more layers of cross machine direction yarns (12-18). The cross machine direction yarns (12-18) in at least one of the layers comprise relatively large (12, 13, 16, 17) and small (14, 15, 18) yarns. The machine and cross machine direction yarns (11, 19, 20) are arranged such that the machine direction yarns (11, 19, 20) define outer floats or knuckles at the surfaces of the fabric and inner floats or knuckles in the body of the fabric around small cross machine direction yarns (14, 15, 18) provided in one of the cross machine direction yarn layers. The parts of the machine direction yarns provided at one surface defining the inner floats or knuckles do not extend to the plane of the obverse surface of the fabric.

Description

The fabric that paper machine is used

The present invention relates to the fabric that a kind of paper machine is used, specifically, relate to a kind of fabric for the use of drying section of paper machine branch, certainly, this does not get rid of other purposes yet.

In general, paper machine is made of three parts, and part, press sections and drying nest promptly are shaped.In each part, all adopt a kind of webbing that one continuous form is transmitted, make it by making the paper making equipment of this paper.Because each part of paper machine has different requirements, so the structure of the fabric that each part adopted is also different.For example; forming fabric has good penetration and surface property concurrently, and the former can provide required drainage, and the latter should be complementary with the type of institute processing fiber; article one, the press fabric band then must promptly absorb and discharge moisture, can protect the paper of new formation simultaneously again.Dry fabric should have heat resistance, and is durable in use under bad chemistry and physical condition, and permeance property wants good simultaneously.

Disclose the dry fabric that a kind of paper machine is used in patent application WO 91/19044, this fabric is formed by the flat yarn of warp-wise and the yarns interwoven of broadwise, during manufacturing, all should have some float on the upper and lower surface of fabric.These float provide a kind of level and smooth fabric face.The warp yarn system comprises upper and lower yarn, and in order to control the permeability of fabric, they vertically are arranged above and below.Warp yarn closely is woven in together mutually so that reduce the permeability of this fabric, and with these warp yarn to locking along warp-wise.

In paper machine, dry fabric passes from the top of dryer roll.Herein, fabric is subjected to heat-flash in a side of roller, and be subjected to the influence that steam penetrates degraded (but main be to result from a side of carrying paper), because the character that institute's papermaking is opened and/or the rust staining or the corrosion of felt roll, also will cause the wearing and tearing of fabric, the edge part degraded of band is a problem especially, because edge part contacts with the heat drying roller all the time.

The fabric that the object of the present invention is to provide a kind of paper machine to use, it can be resisted well because the degraded hot, that hydrolysis and wearing and tearing caused.

The invention provides the fabric that a kind of paper machine is used, it is interwoven by warp yarn and one or more layers weft yams, it is characterized in that one deck weft yams contains the different yarn of thickness at least, and, when these warp-wises and weft yams are arranged, should make warp yarn on a surface of fabric, limit outside float or knot (knucle), and, in one deck weft yams layer, below an above-mentioned surface, limit interior float or knot around thinner weft yams, wherein, that part of warp yarn of float or knot does not extend to the plane at fabric face place in a described lower face limits, and by air that they are spaced apart.

The yarn that preferably all weft yams layers all comprise slightly, carefully do not wait.And preferably above-mentioned two surfaces of fabric all have the float that is made of warp yarn, and all internal layer warp-wise float or knots all are positioned at fabric body, promptly between above-mentioned two surfaces of fabric.

Fabric of the present invention is particularly suitable for using as a dry fabric, but this does not get rid of other purposes yet.

Because the float or the knot of warp yarn do not extend to fabric face,, the opposed faces of yarn comes so just being completely cut off by the heat that air and dryer roll produced.Because the heat-insulating property of air is better than fabric, so paper machine of the present invention has good thermal degradation resistance with fabric, simultaneously, yarn has also improved it to the resistivity by the degradation property of wearing and tearing and hydrolysis generation apart from the increase of fabric face distance.This point, the most important for the drying nest of paper machine.

At the existing warp-wise float in a surface of fabric with at its positive existing warp-wise float can be identical materials, also can be different materials.Can adopt identical or different material to make the yarn of broadwise, these yarns are present in described surface of fabric and front thereof and/or are present within other broadwise layer.The material that is suitable as warp yarn comprises polyester, for example polyethylene terephthalate (PET) and PEN (PEN), polyamide, polyphenylene sulfide (PPS), polyether-ether-ketone (PEEK), perhaps PCTA (copolymer of cyclohexanedimethanol and terephthalic acid (TPA) and isophthalic acid).There is a kind of suitable fabric all to make by polyester (for example PET), another kind of then be the warp yarn that has polyester material at the back side of fabric, and have high performance warp yarn (for example PPS, PEN or PEEK) in its opposed faces.

Because a lip-deep warp yarn of fabric of dividing at drying section of paper machine does not contact with the opposed faces of fabric, will can not contact with drying roller in the warp yarn of fabric to the paper side, so it will can not bear high temperature.So, do not need yarn to have the degradation capability that good opposing is produced by heat or wearing and tearing.Can select the yarn of fabric opposed faces, so that make it to have the improved wear-resistant heat resistance energy that undermines.

Like this, make the warp yarn on two surfaces of fabric, the working life of fabric is improved by the material of selecting to be fit to.

Weft yarn generally adopt polyester (PEN for example, PCTA), PPS, PEEK or its composition are made.

Another novel part of the present invention has been to adopt the different combining forms of weft yams size, so that control its penetrating power.Typical weft yams is of a size of the diameter of 0.3mm, perhaps is 0.6mm, 0.4mm or 0.2mm.WO 91/19044 has realized the control to its penetrating power by the quantity of warp-wise line and weft yams in the change fabric.This practice is compared with the diameter that changes weft yams and is then had shortcoming, because it wants spended time that loom is readjusted.Some other method that is used for controlling penetrability comprises the filling yarn that inserts broadwise, changes the quantity of warp yarn, changes the density of weft yams and adopts non-circular or many broadwises and/or warp yarn.

As the weft yams different-diameter example that uses that combines can be 0.5mm and 0.7mm; 0.5mm with 0.8mm; 0.5mm with 0.9mm; And 0.4mm and 0.9mm.The vary in diameter scope of weft yams is preferably in 0.1mm between the 0.6mm.

In a preferred embodiment of the invention, this fabric comprises the yarn of two-layer at least broadwise.The thread layers of preferably all broadwises all comprises thick and than fine yarn.No matter in any one single broadwise layer, in the still vertically adjacent layer, thick, fine yarn preferably occurs with a kind of alternant.In a preferred embodiment of the present invention, also comprise " filling " weft yams (stuff), so that its permeability is controlled.It is to inweave in the fabric by the weft yams that will have high surface area to add wherein.The use of this additional yarn will reduce the penetrating power of fabric.These additional yarn preferably have the yarn of certain profile.

The monofilament that the yarn of warp-wise of the present invention is preferably flat, its aspect ratio be preferably in 2: 1～4: 1 scope in.Certainly, also can use the yarn (being that cross section is not for circular) of other configurations, for example the triangular-section yarn.The warp yarn of circular cross-section also can be used.Use " D " shape yarn especially suitable.When this yarn uses, should make its curved surface facing in the body of fabric.This curved surface can improve its resistance tocrocking and be easy to carry out the cleaning of yarn (adopting pressure-air/current).This fabric can contain the warp yarn of different section size and/or shape, for example, as a kind of mode of replacement, some yarn is not contacted with paper and/or dryer roll.

Preferably make the yarn of warp-wise float at least two weft yams that diameter is bigger, and therebetween any weft yams that diameter is less, a float formed thus.In a kind of multiply cloth, will in fabric, form below the yarn in broadwise at the knot that constitutes by warp yarn on the opposed faces of fabric.

For the ease of the understanding of the present invention, specific embodiments more of the present invention are described hereinafter with reference to accompanying drawing:

Fig. 1 is the side view of a kind of fabric of the present invention;

Fig. 2 is the side view of second kind of fabric of the present invention.

With reference to Fig. 1, fabric 10 comprises that one deck replaces the thread layers of arranging and constituting by weft yams thick, that carefully do not wait.One first warp yarn 11 extends beyond two thicker warp yarn 12,13, and surpasses a therebetween thinner weft yams 14, thereby forms a float.This yarn passes the below of a thinner weft yams 15 again, form a knot, and then pass through another top thicker weft yams 16,17, and the top of a thinner weft yams 18, the great majority of warp yarn 11 are positioned at the upper surface of fabric.That part of warp yarn 11 that forms knot does not extend to the lower surface of fabric, arranges by same mode in some other warp yarn 19 of the upper surface of fabric yet.Warp yarn 20 on the fabric lower surface floats on below two thicker warp yarn, and the below of a therebetween thinner weft yams.This yarn passes the top of a thinner weft yams again, forms a knot, and then passes the top of other two thicker weft yams and a therebetween thinner weft yams.Warp yarn on the lower surface of fabric does not extend to the upper surface of fabric.In use, this fabric is made band shape, paper supply is opened drying machine and is used.With supporting paper, they are generally by PPS at lip-deep yarn of fabric, PEN, and PEEK or PCTA make, and they have the ability of the degraded that good opposing produces by heat, steam and wearing and tearing.Generally by the polyester manufacturing, it has the ability of good anti-xeothermic degraded at another surperficial yarn of fabric.

Shown in Figure 2 is another kind of fabric 21 of the present invention, and it has the

yarn

22,23 of two-layer broadwise, and each layer all comprises the yarn of thicker and thinner broadwise, and they are alternately arranged.The yarn of two-layer broadwise is preferably heaped in the following manner, but also also nisi, promptly the yarn of a thinner broadwise is positioned at the top of a thicker weft yams, one than heavy filling/pick to yarn be positioned at one than the top of fine filling to yarn.

Warp yarn 24 was floated the top of two

thicker weft yams

25,26 of upper surface and a therebetween thinner weft yams 27.This yarn passes the below of a thinner weft yams 28 in the upper strata 22 again, and the below of a thinner weft yams 29 in the lower floor 23, passes the yarn that another root is arranged in the thinner broadwise in upper strata 30 again.This warp yarn 24 is again along tissue flower type more than the length direction repetition of fabric.Be positioned at the also similar arrangement of some other warp yarn 31 of upper surface.The arrangement mode of the

warp yarn

32,33 of lower surface becomes mirror with the upper strata weft yams.

As previously mentioned, the warp yarn that constitutes float in the bottom of fabric does not extend to its upper surface, and the warp yarn of fabric upper surface formation float does not extend to the lower surface of fabric yet.

Should be understood that above-described examples of implementation only are illustrative purposes.Can make many improvement and change to it.

Claims

1, the fabric that a kind of paper machine is used, it is made into by the yarn of warp-wise and the yarn of one or more layers broadwise, it is characterized in that in one deck weft yams, including at least thicker and thinner yarn, the arrangement mode of the yarn of warp-wise and broadwise is: on a face of fabric, the yarn of warp-wise limits outside float or knot, inner float or knot then are positioned at described below, yarn around broadwise thinner in the weft yams layer, wherein, the yarn that constitutes that part of warp-wise of inner float or knot below described does not extend to the plane at the positive place of this fabric, and by air that they are spaced apart.

2, paper machine fabric as claimed in claim 1 is characterized in that all weft yams layers all comprise thicker and thinner yarn.

3, paper machine fabric as claimed in claim 1 or 2 is characterized in that the float of the warp-wise on described of fabric and the warp-wise float of this fabric face make with identical materials.

4, paper machine fabric as claimed in claim 1 or 2 is characterized in that the float of the warp-wise on described of fabric is to make with different materials with the float of warp-wise on this fabric face.

5, paper machine fabric as claimed in claim 1 is characterized in that this fabric comprises the yarn of several layers broadwise, on described of fabric with its front on the yarn of broadwise adopt different materials to make.

6, paper machine fabric as claimed in claim 1 is characterized in that the float of the warp-wise on face of fabric comprises polyester, and comprises PPS at the warp-wise float of this fabric face, PEN or PEEK.

7, paper machine fabric as claimed in claim 2 is characterized in that thicker and thinner weft yams, and the scope of its diameter difference is 0.1mm～0.6mm.

8, papermaker's fabric as claimed in claim 2 is characterized in that the yarn of thicker and thinner broadwise occurs with alternant in any one deck weft yams layer.

9, paper machine fabric as claimed in claim 8 is characterized in that this fabric comprises not only one deck weft yams, and the yarn of thicker and thinner broadwise alternately occurs in the layer of vertical direction.

10, paper machine fabric as claimed in claim 1 is characterized in that this fabric also comprises the additional filling yarn of broadwise.

11, paper machine fabric as claimed in claim 10, the cross section that it is characterized in that this filling yarn is non-circular.

12, paper machine fabric as claimed in claim 1, the cross section that it is characterized in that the yarn of its warp-wise is non-circular.

13, paper machine fabric as claimed in claim 12, the yarn that it is characterized in that warp-wise is a flat monofilament, its aspect ratio is 2: 1～4: 1.

14, paper machine fabric as claimed in claim 12, the shape that it is characterized in that the yarn of warp-wise is " D ", its curved surface is in this fabric body.

15, paper machine fabric as claimed in claim 1 is characterized in that the size and/or the shape of its cross section of warp yarn that this fabric is contained is different.

16, paper machine fabric as claimed in claim 1 is characterized in that this fabric is a dry fabric.