CN1172055C

CN1172055C - Felt

Info

Publication number: CN1172055C
Application number: CNB011296372A
Authority: CN
Inventors: С��ԭ��־; 小林靖彦
Original assignee: Ichikawa Woolen Textile Co Ltd
Current assignee: Ichikawa Woolen Textile Co Ltd
Priority date: 2000-06-27
Filing date: 2001-06-25
Publication date: 2004-10-20
Anticipated expiration: 2021-06-25
Also published as: CA2351743A1; JP2002013088A; EP1167623A1; CN1246524C; CN1330184A; CN1566522A; US20020060047A1

Abstract

A papermaking felt comprises a woven ground fabric layer and a fibrous web accumulated on one side or on both sides of the ground fabric layer. The ground fabric and the fibrous web are intertwined and made integral by needling. To maintain the three dimensional structure of the felt against the pressure to which the papermaking felt is continually subjected in a high speed papermaking machine, and thereby retain the felt's water-squeezing function over a long period of time, all yarns of the warp or weft, or a part of the distributed yarns of the warp or weft which composes the ground fabric layer, are replaced by straight yarns S so that the warp or weft themselves maintain the felt's dimensional stability. Alternatively, straight yarns may be additionally and evenly inserted along the warp or weft of the ground fabric layer.

Description

Felt

Technical field

The present invention relates to a kind of felt of squeezing the water out from a paper web of in papermaking operation, being used for.The invention particularly relates to a kind of felt that in use can reduce that has along the change in size of MD and CMD direction.Term " MD " refers to the felt traffic direction." CMD " refers to and the rectangular direction of MD direction.

Background technology

In paper-making process, need woollen blanket can more effectively extrude moisture in the wet web.It also is important keeping the press for extracting juice outlet capacity of woollen blanket for a long time after the first use of woollen blanket.The origin of these demands is that woollen blanket is pushed repeatedly in a paper machine, and therefore, the function of pressing water progressively worsens.Like this, final, woollen blanket must be replaced by a new woollen blanket.And want to prolong service life of woollen blanket, the ability that keeps having in the woollen blanket enough press for extracting juice water before woollen blanket is replaced also is important.In operation, Wen Dingxing maintenance is one of most popular characteristic of felt.

In order to squeeze the water out from paper web, woollen blanket is adapted to pass through the pressure section of paper machine.It also must be by the pressure section of a cleaning device.The woollen blanket per pass is pressed section, all is extruded.Although press section to impose on woollen blanket pressure,, need to keep the elasticity of woollen blanket in order to keep its seepage of water.

For the high speed paper machine of present introducing, woollen blanket presses section to become to the time span of next passage of pressing section by first of paper machine quite to lack (being approximately 1 second).As a result, the time that allows woollen blanket to revert to its three-dimensional structure owing to woollen blanket self elasticity becomes very short.Because above-mentioned condition, the variation of woollen blanket size becomes unavoidably, and detrimental effect to be woollen blanket lost when operation stability, even and expect to be approximately 40 days its service life, it also demonstrated the deterioration of press for extracting juice outlet capacity in several days.

Summary of the invention

Main purpose of the present invention is to address the above problem, and provides a kind of even also can keep the felt of its three-dimensional character in high speed paper machine, and wherein woollen blanket is pushed at short notice repeatedly.

Felt of the present invention comprises a fiber web of a bottom cloth layer of being made up of a woven fabric and at least one side that is placed on this bottom cloth layer, and bottom cloth layer and fiber web integrally weave by acupuncture, and bottom cloth layer has a warp thread and weft yarn.In the first embodiment of the present invention, the warp thread of base fabric and weft yarn comprise distributed yarn, are made up of straight yarn to the distributed yarn of small part warp thread or weft yarn.Therefore, the warp thread or the weft yarn itself of formation bottom cloth layer can keep high DIMENSIONAL STABILITY.

In a second embodiment, bottom cloth layer is made up of the coiling yarn, and additional straight yarn is inserted equably along the warp thread or the weft yarn of base fabric.Insert the straight yarn that adds by warp thread or weft yarn, can keep high DIMENSIONAL STABILITY along bottom cloth layer.

According to a kind of felt of the present invention, comprise the bottom cloth layer of forming by a woven fabric, with the fiber web at least one side that is arranged on this bottom cloth layer, this bottom cloth layer and fiber web integrally weave by acupuncture, and this bottom cloth layer comprises a warp thread and weft yarn, a kind of yarn in warp thread and the weft yarn is made up of the coiling yarn, wherein is made up of straight yarn to the warp thread of this bottom cloth layer of small part or the another kind of yarn in the weft yarn.

Description of drawings

The drawing of Figure of description is described as follows.

Fig. 1 (a) is the schematic cross-section of amplification of the woollen blanket of one embodiment of the present of invention, comprises the bottom cloth layer that a pair of is knitted, and part warp thread or weft yarn are substituted by straight yarn.

Fig. 1 (b) is the similar view of another embodiment, and wherein the structure of bottom cloth layer is changed.

Fig. 2 (a) is the schematic cross-section of the amplification of the present invention's one woollen blanket, comprises the bottom cloth layer of knitting more, and wherein part warp thread or weft yarn are substituted by straight yarn.

Fig. 2 (b) is the similar view of another embodiment, and wherein the structure of bottom cloth layer is changed.

Fig. 3 (a) is the schematic cross-section of amplification of another embodiment of woollen blanket of the present invention, comprises a woven bottom cloth layer, and wherein straight yarn is added in warp thread or the weft yarn.

Fig. 3 (b) is the similar view of another embodiment, and wherein the structure of bottom cloth layer is changed.

The specific embodiment

In brief, among Fig. 1 (a) and Fig. 1 (b), the bottom cloth layer of woollen blanket is two woven fabric of knitting structure, and part warp thread or weft yarn are made up of straight yarn.Equally, knitting in the structure shown in Fig. 2 (a) and Fig. 2 (b), part warp thread or weft yarn are by rectilinear(-al) more.Among Fig. 3 (a) and Fig. 3 (b), straight yarn adds in the warp thread or weft yarn of bottom cloth layer.

Woollen blanket 1 of the present invention comprises the fiber web 3 that accumulates on the bottom cloth layer 2, and this bottom cloth layer 2 is made up of a woven fabric.One fiber web 3 can only be arranged on a side of bottom cloth layer 2, or, be arranged on the upside and the downside of bottom cloth layer alternatively.Fiber web or fleece weave together by acupuncture and bottom cloth layer, become one with bottom cloth layer thus.Acupuncture is handled the sign that is produced and is not illustrated in the accompanying drawings.

Straight yarn S keeps the press for extracting juice water function of woollen blanket thus in order to keep the three-dimensional structure of bottom cloth layer in the bottom cloth layer 2.Can there be dual mode to use straight yarn S.A kind of mode is to substitute the warp thread 2a of part or the distributed yarn of weft yarn 2b with straight yarn S, and warp thread 2a or weft yarn 2b form bottom cloth layer 2, or substitutes whole warp thread 2a or weft yarn 2b with straight yarn S.Remaining yarn is coiling yarn K, shown in Fig. 1 (a), 1 (b) and Fig. 2 (a), 2 (b).The another kind of mode of using straight yarn S provides a bottom cloth layer 2 of being made up of coiling yarn K, and interpolation straight yarn S, and this straight yarn S distributes equably along warp thread 2a or weft yarn 2b, shown in Fig. 3 (a) and 3 (b)." distribute equably " about the term of the distribution of straight yarn S and to mean that straight yarn relative volume winding yarns K is with arrangements such as 1: 1,1: 2 or 2: 1.For the height of the three-dimensional structure that improves bottom cloth layer 2, preferably the proportioning of straight yarn S and coiling yarn K is at least 40%.

If straight yarn S is the yarn that adds, shown in Fig. 3 (a), 3 (b), rather than the substitute of some coiling yarn K, they can be arranged along warp thread 2a in the bottom cloth layer 2 or weft yarn 2b, and bottom cloth layer just is not made up of coiling yarn K.Also can with heat-sealing (promptly passing through lamination) or with a bonding agent with the pellet module of predetermined orientation subsides straight yarn S to a bottom cloth layer 2, wherein, bottom cloth layer is made up of coiling yarn K.

In the accompanying drawing, two circles refer to the straight yarn along warp-wise, and single circle refers to the coiling yarn along warp-wise.The pair of parallel line refers to the straight yarn along broadwise, and a pair of parallel lines that have a little between them refer to the coiling yarn along broadwise.

In the bottom cloth layer 2 in the accompanying drawings, straight yarn S is all arranged along warp-wise and broadwise.Therefore, on both direction, promptly can obtain DIMENSIONAL STABILITY along MD direction and CMD direction.But,, promptly, much less, also can obtain similar DIMENSIONAL STABILITY only at warp-wise or only in the broadwise use even straight yarn is only in one direction.For example, when with straight yarn S when broadwise is inserted bottom cloth layer 2, the modulus of broadwise has improved, result, heat setting in manufacture process and the dimension reduction amount that causes is less.Straight yarn S suppresses the increase of the width of generation in use and the reduction of thickness, and lateral dimensions is stable as a result.

When bottom cloth layer 2 was made up of a weft yarn bilayer or weft yarn treble cloths, straight yarn S inserted along warp-wise, and when bottom cloth layer 2 was made up of a warp thread bilayer or warp triple layer fabric, straight yarn S inserted along broadwise.The product of verified production like this in use warp-wise and broadwise size is all stable.This felt structure is useful especially for the DIMENSIONAL STABILITY that improves the felt that uses in the high speed paper machine of introducing recently.

" straight yarn " S comprises being exactly straight yarn originally, as PET (polyethylene terephthalate) monofilament." straight yarn " comprises that also those relative volume winding yarns K is " straight " yarn.For example, K is flexible when the coiling yarn, flexible yarn, and during as nylon, straight yarn can be selected the monofilament or the PBT of less bending so, PPS, NYLON610, nylon 612, nylon 12, semi-aromatic nylon (MXD6), or aromatic multifilament.Equally, aforesaid, owing to can relatively determine " directly ", therefore, it is those straight yarns that straight yarn need not be defined as, but the result as fibre structure constitutes comprises those yarns that almost become straight.

In the situation of Fig. 1 (a), 1 (b) and Fig. 2 (a), 2 (b), " coiling " yarn K has referred to fixing or the straight yarn S effect of fluctuating up and down relatively.In the situation of Fig. 3 (a) and 3 (b), coiling yarn K is the main yarn that constitutes base fabric structure.

In order to summarize the advantage of invention, as mentioned above, the present invention is a felt, comprises a bottom cloth layer and a fiber web that is arranged at least one side of described bottom cloth layer of a woven fabric, and bottom cloth layer and fiber web weave, and make one with acupuncture.

According to an aspect of the present invention, woollen blanket is characterised in that the warp thread of formation bottom cloth layer or all yarns of weft yarn are straight yarns, or the distributed yarn of part warp thread or weft yarn is a straight yarn.Because the DIMENSIONAL STABILITY of the warp thread of formation bottom cloth layer or the straight yarn of weft yarn has improved along the modulus that inserts the straight yarn direction.Therefore, the width reduction that takes place in the heat setting stage of manufacture process has reduced, and uses the increase of width in the process of woollen blanket and the reduction of thickness to be suppressed on paper machine.Therefore, the present invention helps the stability of the woollen blanket in paper machine when running, reduced its longitudinally with the extension of side direction.Felt of the present invention can be realized it as a felt desired function long period satisfactorily, and this is quite desirable and favourable result.

According to a further aspect in the invention, felt is characterised in that bottom cloth layer is made up of the coiling yarn, and straight yarn is by additional and insert along the warp-wise or the broadwise of base fabric yarn equably.Because straight yarn can be strengthened bottom cloth layer, the DIMENSIONAL STABILITY of bottom cloth layer can relatively easily obtain, and this also is quite desirable and favourable result.

Claims

1. felt, comprise the bottom cloth layer of forming by a woven fabric, with the fiber web at least one side that is arranged on this bottom cloth layer, this bottom cloth layer and fiber web integrally weave by acupuncture, and this bottom cloth layer comprises a warp thread and weft yarn, a kind of yarn in warp thread and the weft yarn is made up of the coiling yarn, wherein is made up of straight yarn to the warp thread of this bottom cloth layer of small part or the another kind of yarn in the weft yarn.

2. felt according to claim 1, wherein the quantity of this straight yarn is at least 40% of this coiling number of yarns.