JP4002408B2 - Joints for papermaking canvas - Google Patents
Joints for papermaking canvas Download PDFInfo
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- JP4002408B2 JP4002408B2 JP2001163128A JP2001163128A JP4002408B2 JP 4002408 B2 JP4002408 B2 JP 4002408B2 JP 2001163128 A JP2001163128 A JP 2001163128A JP 2001163128 A JP2001163128 A JP 2001163128A JP 4002408 B2 JP4002408 B2 JP 4002408B2
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- canvas
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- weft
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Description
【０００１】
【発明が属する技術分野】
本発明は抄紙機械における紙の搬送用ベルトに用いられる製紙用カンバスの継手部に関する。
【０００２】
【従来の技術】
製紙用カンバスは接紙面を表面平滑な斜文織にして紙面への当たりを滑らかにして紙質の向上を図っているが、継手部分においても紙面への当たりを少なくして紙質の向上を図る必要がある。実開昭６０−１７７９９９号には経糸ループの緯糸を除外し、さらに接紙面側の先端緯糸の断面積を他の緯糸よりも大きくして、経糸ループの接紙面にたいする当たりを軽減し紙面に継ぎ手のマークがつくことを防止している。
【０００３】
【発明が解決すべき課題】
製紙用カンバスは高温、高湿で使用されるためとくにポリエステルカンバスの場合は湿熱による劣化がその寿命に直接かかわっているとされてきた。もちろん紙面、ロールとの接触によるカンバスの摩耗もあるが湿熱による劣化にくらべるとその程度は小さかった。しかし近年シングルラン方式による製紙機械の高速化がすすみ、摩耗によるカンバスの劣化は湿熱による劣化を上回るようになってきた。特に継手部にその傾向が著しくループ破損事故の原因になっている。
【０００４】
これまで多く使われているコンベンショナルランの場合は各シリンダーの間にカンバスと紙が接触しないいわゆるフリーランの状態があり、紙の乾燥、収縮は主にこのフリーラン部で起こっている。シングルランの場合は紙はつねにカンバスに拘束された状態で走行するので乾燥、収縮もこの状態のままで起こる。紙の収縮によりカンバスと摩擦があり、カンバスを摩滅させることになる。またシングルランの場合は紙はカンバスの内側を通る場合と外側を通る場合とで周速差を生じるのでここでも摩擦が起こりカンバスを摩滅させることになる。継手部の経糸は紙面側の盛り上がるため特に摩滅されやすい状態にある。
【０００５】
【課題を解決する手段】
本発明は上記の欠点を解消した継手部に関する。すなわち、二重織り以上の多重織りで接紙面側が斜文織で、接紙面側の経糸にかかる緯糸の数が機械面側の経糸にかかる緯糸の数より多い製紙用カンバスにおいて、カンバスの両端部の経糸の一部は接紙面側の最先端緯糸と機械面側の最先端緯糸の間を通って延長し接合用経糸ループを形成して折り返し、再び接紙面側の最先端緯糸と機械面側の最先端緯糸の間を通ってカンバスの多重織り組織内に織り込まれ緯糸と組織しており、接合用経糸ループの頂部はカンバスの接紙面より低いものであることを特徴とする製紙用カンバスの継手部である。
【０００６】
本発明の好ましい態様は、上記製紙用カンバスの継手部は接紙面側の最先端緯糸は多数の微細繊維の撚り糸を使用するものである。
【０００７】
さらに本発明の好ましい態様は、前記製紙用カンバスの継手部は接合用経糸ループは断面が偏平形状のモノフィラメントを使用するものである。
【０００８】
【発明の実施の態様】
上記本発明に係るカンバスは接紙面側が斜紋織りである。斜紋織りは表面が他の織り方よりも平滑で紙面との摩擦が少なく、特にシングルラン方式の場合に効果的である。経糸の一部は接合用のループとするため接紙面側の最先端緯糸と機械面側の最先端緯糸の間を通って延長し接合用経糸ループを形成して折り返し、再び接紙面側の最先端緯糸と機械面の最先端緯糸の間を通ってカンバスの多重織り組織内に織り込まれ緯糸と組織している。
【０００９】
図１に示すように接紙面が斜紋織りの場合接合用の経糸ループとなる経糸（２）は接紙面側の最先端緯糸（３）の下側と機械面側の最先端緯糸（４）の上側を通り接合用経糸ループ（１）を作って折り返し再び機械面側の最先端緯糸（４）の上側と接紙面側の最先端緯糸（３）の下側の間を通ってカンバスの織り組織内に織り込まれている。このとき本来の斜紋織り組織ではループを作って折り返した経糸は接紙面側の最先端緯糸（３）の上側を通って組織の外にでるべきであるが本発明の継手部は下側を通ることを特徴とする。
【００１０】
接合用経糸ループの頂部はカンバスの接紙面より低いものであるがその高さは接紙面より０．１ｍｍ以上低いものであることが好ましい。
【００１１】
また接紙面側の最先端緯糸である多数の微細繊維の撚り糸はマルチフィラメント糸、紡績糸、１本のもしくは複数本のフィラメントを芯にしてその周囲をスパン糸で被覆した複合紡績糸等の中から選ぶことができる。
【００１２】
このような構造をもつ本発明の製紙用カンバスの継手部は接合用ループ部の頂部（５）はカンバスの接紙面（Ａ）より低く位置するものになるのである。これは接紙面側と機械面側の最先端緯糸の間でループが押さえ付けられることによるものである。もちろん過大にループを大きなものにすればループ部の頂部はカンバスの接紙面より高くなるが、ループとして適切な大きさのものであればループはカンバスの厚さより薄くでき、接合用経糸ループの頂部（５）は接紙面の高さより低いものになる。ループの適切な大きさとは、カンバス長さ方向のループの長さがカンバスの厚さの０．５〜３倍程度である。好ましい頂部の高さはカンバス接紙面より０．１ｍｍ以上低い高さである。より好ましくは０．３ｍｍ以上低い高さ、さらに好ましくは０．４ｍｍ以上低い高さである。
【００１３】
またカンバス両端部のループを直接組み合わせず、スパイラル線を介在させて両端部を接合する方式の継手部においても同様である。この場合も図２に示すように接合用の経糸ループとなる経糸（２）は斜紋織りの組織の通り接紙面側の最先端緯糸（３）の下側と機械面側の最先端緯糸（４）の上側を通り接合用経糸ループ（１）を作って折り返し再び機械面側の最先端緯糸（４）の上側と接紙面側の最先端緯糸（３）の下側の間を通ってカンバスの織り組織内に織り込まれている。別に用意するスパイラル線（６）は直接接合用経糸ループに係合するか、あるいは図２にあるように芯線（７）により接合用経糸ループと係合する。
【００１４】
カンバスの経糸は断面形状が偏平なモノフィラメントが好ましい。偏平の度合いはタテ／ヨコの比が０．６７〜０．９０のものが好ましい。また繊度は２０００〜５０００デシテックス、より好ましくは２９７０〜５０００デシテックスである。
【００１５】
【実施例】
経糸にポリエステルモノフィラメントの偏平糸（タテ０．４４ｍｍ、幅０．６ｍｍ）、緯糸にポリエステルモノフィラメント（直径０．６５ｍｍ）を用いて片面（接紙面）が斜紋織りのカンバス（経糸４８本／２５ｍｍ，緯糸３６本／２５ｍｍ）を製造した。両端部において緯糸を除去して経糸を延長し、一部を最先端緯糸の位置で折り返して隣接する経糸の組織に織り込んだ。隣接する経糸はあらかじめ折り返し経糸の長さ分を除去しておきその部分に折り返し経糸を織り込むので元の組織のとおりのものになる。また他の一部を接合用のループを作って折り返し隣接する経糸の位置に織り込んだ。これもあらかじめ隣接する経糸を折り返し経糸の長さ分を除去してそのあとに織り込むので元の組織のとおりのものになる。カンバスの厚さは１．８ｍｍ、ループのカンバス長手方向の長さは２．５ｍｍであった。またループ部の頂部はカンバスの接紙面より０．３ｍｍ低いものであった。
接合用のループを作る経糸は接紙面側の最先端緯糸の下側と機械面側の最先端緯糸の上側を通り、ループを作って折り返し再び機械面側の最先端緯糸の上側と接紙面側の最先端緯糸の下側の間を通ってカンバスの織り組織内に織り込まれている。
【００１６】
【発明の効果】
上記実施例の接合用経糸ループ部の頂部はカンバスの接紙面より０．３ｍｍ低くこの結果走行中に接合用経糸ループは紙面に接触することが少ないので紙面への継ぎ手マークの解消の効果があった。また紙面との間の摩擦による継ぎ手ループの破損が少なくカンバスの使用時間を長くすることができた。
【図面の簡単な説明】
【図１】 本発明の製紙用カンバスの継手部の一例を示す側方の断面図である。
【図２】 本発明の製紙用カンバスの継手部の一例を示す側方の断面図である。
【符号の説明】
１．接合用経糸ループ
２．接合用経糸ループとなる経糸
３．接紙面側の最先端緯糸
４．機械面側の最先端緯糸
５．接合用経糸ループの頂部
６．スパイラル線
７．芯線[0001]
[Technical field to which the invention belongs]
The present invention relates to a joint portion of a papermaking canvas used for a paper conveying belt in a papermaking machine.
[0002]
[Prior art]
The canvas for papermaking is designed to improve the paper quality by making the paper contact surface smooth and textured so that the contact with the paper surface is smooth, but it is also necessary to improve the paper quality by reducing the contact with the paper surface even at the joints. There is. In Japanese Utility Model Publication No. 60-177999, the weft of the warp loop is excluded, and the cross-sectional area of the leading weft on the paper contact surface side is made larger than that of other wefts to reduce the contact with the paper contact surface of the warp loop and to the paper surface. This prevents the mark from being attached.
[0003]
[Problems to be Solved by the Invention]
Since paper canvas is used at high temperature and high humidity, it has been said that deterioration due to wet heat is directly related to its life, especially in the case of polyester canvas. Of course, there was canvas wear due to contact with the paper surface and rolls, but the degree was small compared to deterioration due to wet heat. However, in recent years, the speed of paper machines using the single run method has been increased, and the deterioration of the canvas due to wear has come to exceed the deterioration due to wet heat. This tendency is particularly noticeable at the joints, causing a loop breakage accident.
[0004]
In the conventional run that has been used so far, there is a so-called free run state in which the canvas and the paper do not contact each cylinder, and the drying and shrinkage of the paper mainly occurs in this free run portion. In the case of a single run, the paper always travels in a state of being restrained by the canvas, so that drying and shrinkage also occur in this state. The shrinkage of the paper causes friction with the canvas and wears the canvas. In the case of a single run, the paper causes a difference in peripheral speed between when it passes through the inside of the canvas and when it passes through the outside of the canvas, so friction also occurs here and wears the canvas. Since the warp of the joint is raised on the paper surface side, it is particularly easily worn away.
[0005]
[Means for solving the problems]
The present invention relates to a joint part in which the above-mentioned drawbacks are eliminated. That is, in a canvas for papermaking where the number of wefts applied to the warp on the paper surface side is greater than the number of wefts applied to the warp on the machine surface side , the both ends of the canvas A part of the warp yarn extends between the cutting edge weft on the paper contact surface side and the cutting edge weft on the machine surface side to form a joining warp loop and folds back again. The cutting edge weft on the paper contact surface side and the machine surface side again Of the canvas for papermaking, characterized in that the top part of the warp loop for joining is lower than the paper contact surface of the canvas. It is a joint part.
[0006]
In a preferred embodiment of the present invention, the joint portion of the papermaking canvas uses a plurality of fine fiber twisted yarns as the cutting edge weft on the paper contact surface side.
[0007]
Furthermore, in a preferred embodiment of the present invention, the joint part of the papermaking canvas uses a monofilament with a flat cross-section as the joining warp loop.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
In the canvas according to the present invention, the paper contact surface side is a diagonal weave. The oblique pattern weave is smoother than other weaving methods and has less friction with the paper surface, and is particularly effective in the case of the single run method. Since a part of the warp is used as a joining loop, it extends between the cutting edge weft on the paper contact side and the cutting edge weft on the machine side, forms a joining warp loop, turns it back, and again returns to the cutting edge on the paper contact side. It passes between the leading weft and the most advanced weft on the machine surface and is woven into the multi-weave structure of the canvas to form the weft.
[0009]
As shown in FIG. 1, when the paper contact surface is a diagonal weave, the warp yarn (2) that becomes the warp loop for joining is the lower side of the cutting edge weft (3) on the paper contact surface side and the cutting edge weft (4) on the machine surface side. Weave warp loop (1) that passes through the upper side and folds it back again, passing between the upper side of the cutting edge weft (4) on the machine side and the lower side of the cutting edge weft (3) on the paper-contacting side. It is woven in. At this time, in the original oblique weave structure, the warp yarn that has been looped and turned should pass out of the structure through the upper side of the cutting edge weft (3) on the paper contact surface side, but the joint portion of the present invention passes the lower side. It is characterized by that.
[0010]
The top of the joining warp loop is lower than the paper contact surface of the canvas, but the height is preferably 0.1 mm or more lower than the paper contact surface.
[0011]
In addition, many fine fiber twist yarns, which are the most advanced wefts on the paper-contacting surface side, are multifilament yarns, spun yarns, composite spun yarns with one or more filaments as the core, and the surroundings covered with spun yarns, etc. You can choose from.
[0012]
In the joint part of the paper canvas of the present invention having such a structure, the top part (5) of the joining loop part is positioned lower than the paper contact surface (A) of the canvas. This is because the loop is pressed between the leading edge weft on the paper contact side and the machine side. Of course, if the loop is made too large, the top of the loop will be higher than the paper contact surface of the canvas, but if the loop is of an appropriate size, the loop can be made thinner than the canvas, and the top of the warp loop for joining (5) is lower than the height of the paper contact surface. The appropriate size of the loop means that the length of the loop in the canvas length direction is about 0.5 to 3 times the thickness of the canvas. A preferable height of the top is 0.1 mm or more lower than the canvas paper contact surface. More preferably, the height is 0.3 mm or more lower, and still more preferably 0.4 mm or more.
[0013]
The same applies to a joint portion in which both ends are joined by interposing a spiral wire without directly combining loops at both ends of the canvas. In this case as well, as shown in FIG. 2, the warp (2), which becomes a warp loop for joining, is under the cutting edge weft (3) on the paper contact surface side and the cutting edge weft (4 ) To make a joining warp loop (1) and turn it back again between the upper side of the cutting edge weft (4) on the machine surface side and the lower side of the cutting edge weft (3) on the paper contact side. It is woven into the woven tissue. A separately prepared spiral wire (6) is directly engaged with the joining warp loop, or is engaged with the joining warp loop by the core wire (7) as shown in FIG.
[0014]
The canvas warp is preferably a monofilament having a flat cross-sectional shape. The degree of flatness is preferably that having a vertical / horizontal ratio of 0.67 to 0.90. The fineness is 2000 to 5000 dtex, more preferably 2970 to 5000 dtex.
[0015]
【Example】
Polyester monofilament flat warp (vertical 0.44mm, width 0.6mm) for warp, polyester monofilament (diameter 0.65mm) for weft, and one side (paper contact surface) with a diagonal pattern weave (48 warps / 25mm, weft) 36/25 mm). The wefts were removed at both ends to extend the warp, and a part was folded at the position of the most advanced weft and woven into the adjacent warp structure. Adjacent warps are removed in advance for the length of the folded warp and the folded warp is woven into that portion, so that the original structure is obtained. In addition, the other part was made into a loop for joining and folded back and woven into the position of the adjacent warp. This is also the same as the original structure because the adjacent warp is folded in advance and the length of the warp is removed and then weaved. The thickness of the canvas was 1.8 mm, and the length of the loop in the longitudinal direction of the canvas was 2.5 mm. The top of the loop part was 0.3 mm lower than the paper contact surface of the canvas.
The warp that makes the loop for joining passes through the lower side of the cutting edge of the weft on the paper-contacting side and the upper side of the cutting edge of the weft on the machine side. Is woven into the canvas weave through the underside of the cutting edge weft.
[0016]
【The invention's effect】
The top part of the warp loop part for joining in the above example is 0.3 mm lower than the paper contact surface of the canvas. As a result, the joint warp loop is less likely to come into contact with the paper surface during running, so that the joint mark on the paper surface is eliminated. It was. In addition, the joint loop was less damaged by friction with the paper surface, and the usage time of the canvas could be extended.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an example of a joint portion of a papermaking canvas according to the present invention.
FIG. 2 is a side sectional view showing an example of a joint portion of a papermaking canvas according to the present invention.
[Explanation of symbols]
1. 1. Warp loop for joining 2. Warp to be a warp loop for joining 3. Cutting edge weft on the paper-contacting side 4. Cutting edge weft on the
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001163128A JP4002408B2 (en) | 2001-05-30 | 2001-05-30 | Joints for papermaking canvas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001163128A JP4002408B2 (en) | 2001-05-30 | 2001-05-30 | Joints for papermaking canvas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002348795A JP2002348795A (en) | 2002-12-04 |
| JP4002408B2 true JP4002408B2 (en) | 2007-10-31 |
Family
ID=19006154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001163128A Expired - Fee Related JP4002408B2 (en) | 2001-05-30 | 2001-05-30 | Joints for papermaking canvas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4002408B2 (en) |
-
2001
- 2001-05-30 JP JP2001163128A patent/JP4002408B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002348795A (en) | 2002-12-04 |
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