JPH10109058A - Continuous drying method of belt-like material - Google Patents

Continuous drying method of belt-like material

Info

Publication number
JPH10109058A
JPH10109058A JP26410696A JP26410696A JPH10109058A JP H10109058 A JPH10109058 A JP H10109058A JP 26410696 A JP26410696 A JP 26410696A JP 26410696 A JP26410696 A JP 26410696A JP H10109058 A JPH10109058 A JP H10109058A
Authority
JP
Japan
Prior art keywords
floater
floating
catenary
front row
nozzle group
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
JP26410696A
Other languages
Japanese (ja)
Other versions
JP3684002B2 (en
Inventor
Yasuo Matsuura
泰夫 松浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP26410696A priority Critical patent/JP3684002B2/en
Publication of JPH10109058A publication Critical patent/JPH10109058A/en
Application granted granted Critical
Publication of JP3684002B2 publication Critical patent/JP3684002B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Drying Of Solid Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent a steel strip from coming into contact with a floater nozzle group at the lower part of the front row and to enable stabilized floating transportation by specifying the floating power of the floater nozzle group at the lower part of the front row in the lower part floater nozzles by a specific equation. SOLUTION: A floating zone B consists of the floater nozzle group 4 at the lower part of the front row, the lower part floater nozzles 5 and upper part floater nozzles 6 utilizing a floater nozzle jetting high pressure gas from plural slit-shaped blow-out ports provided on e.g. a nozzle plate. On the assumption that the floating force F floats the steel plate empty weight F' at the floater nozzle group 4 side at the lower part of the front row from the lowest point (a), the floating force is expressed by F>=t.B.(L.γ-(2H.T.γ)<1/2> ). Here t:thickness of the belt-like body, B: width of the belt-like body, L: span, γ = specific density of the belt-like body, T: tension of the belt-like body, H: height of a fulcrum of a catenary part.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、例えば鋼板などの
帯状体の塗装ラインにおいて、乾燥炉の炉内の前段部に
カテナリー方式を後段部にフローティング方式を採用し
た帯状体の連続式乾燥方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous drying method for a strip, for example, in a coating line for strips such as a steel plate, in which a catenary method is used in a front part of a drying furnace and a floating method is used in a latter part. .

【0002】[0002]

【従来の技術】鋼板などの塗装ラインにおける乾燥炉
は、その搬送方式から「カテナリー方式」、「フローテ
ィング方式」及び「カテナリー+フローティング方式」
に分類される。「カテナリー+フローティング方式」で
は、鋼板表面に塗装された塗膜が乾燥するまでをカテナ
リー方式とし乾燥段階の塗膜表面に衝突する熱風の風速
を制限して、塗膜表面に「風紋」とよばれる塗膜欠陥が
生じるのを防ぐように配慮されており、フローティング
ゾーンでは、乾燥が完了した塗膜をフローター(浮上搬
送装置)で浮上搬送しながら効率よく焼付けを行う方式
としている。
2. Description of the Related Art Drying furnaces for coating lines for steel sheets and the like use a "catenary system", a "floating system" or a "catenary + floating system" because of their transport system.
are categorized. The “catenary + floating method” uses a catenary method until the paint film coated on the steel sheet dries, restricts the velocity of hot air that collides with the paint film surface in the drying stage, and calls the “wind ripple” on the paint film surface. Care has been taken to prevent the occurrence of coating film defects, and in the floating zone, the baking is performed efficiently while the dried coating film is levitated and transported by a floater (floating transport device).

【0003】[0003]

【発明が解決しようとする課題】このような従来の「カ
テナリー+フローティング方式」乾燥炉においては、通
板張力が変化した場合に、カテナリー最下点の位置及び
カテナリー量が変化するため、鋼板を安定して通板する
ことができないという問題があった。すなわち、通板張
力が急に低下した場合は、カテナリー最下点の位置が炉
内の入側方向に移り、かつ、カテナリー量が大きくなる
ため、フローティング入口部で鋼板と下部フローターノ
ズルが接触し鋼板塗装面に疵が入るという問題が発生し
ていた。さらに、カテナリー部を通過した鋼板には、C
反りと呼ばれる板幅方向の湾曲が生じる傾向があり、フ
ローティング開始部において鋼板が平坦な状態ではない
ために最前列下部フローターノズル群に部分的に接触し
易いという問題があった。
In such a conventional "catenary + floating method" drying furnace, when the threading tension changes, the position of the catenary lowermost point and the amount of catenary change, so that the steel plate cannot be used. There was a problem that it was not possible to pass the sheet stably. In other words, when the threading tension suddenly drops, the position of the lowest point of the catenary moves toward the inlet side of the furnace, and the amount of catenary increases, so that the steel plate and the lower floater nozzle come into contact at the floating entrance. There has been a problem that the painted surface of the steel sheet has a flaw. Furthermore, the steel sheet that has passed through the catenary part has C
There is a tendency that a curvature called a warp occurs in the width direction of the plate, and the steel plate is not flat at the floating start portion, so that there is a problem that it is likely to partially contact the lowermost floater nozzle group in the front row.

【0004】特に、従来の「カテナリー+フローティン
グ方式」乾燥炉においては、最前列下部フローターノズ
ル群の高さ位置が、後面に設けられた下部フローターノ
ズルと同一レベルにあるため、カテナリー最下点から最
前列下部フローターノズル群までの鋼板自重を最前列下
部フローターノズル群だけで負担して浮上支持すること
になることから接触の虞れは非常に高く、成品歩留り悪
化の原因となっていた。接触を防止するために下部フロ
ーター及び最前列下部フローターノズル群の浮上力を大
きくすることは、従来は浮上力を最適に決定することが
できなかったため浮上力を過大に設定せざるを得ず、エ
ネルギーコストの面で非常に高価になり、また、鋼板の
C反りを助長する虞れが高くなることから、実用的では
なかった。したがって、従来の「カテナリー+フローテ
ィング方式」を採用した乾燥炉では、カテナリー最下点
位置がフローティングゾーン内に位置するように設計さ
れており、カテナリー支持点高さ(図2におけるH)を
大きくせざるを得ず、乾燥炉の炉高が高くなるという欠
点を有していた。
In particular, in the conventional "catenary + floating type" drying furnace, the height position of the lowermost floater nozzle group in the front row is at the same level as the lower floater nozzle provided on the rear surface, so Since the steel sheet itself up to the front row lower floater nozzle group is borne and supported by the front row lower floater nozzle group alone, the risk of contact is extremely high, which has caused a deterioration in product yield. Increasing the levitation force of the lower floater and the front row lower floater nozzle group in order to prevent contact has to set the levitation force excessively because the levitation force could not be optimally determined conventionally, It is not practical because it is very expensive in terms of energy cost and increases the possibility of promoting C warpage of the steel sheet. Therefore, in a drying furnace employing the conventional “catenary + floating method”, the lowermost point of the catenary is designed to be located in the floating zone, and the height of the catenary support point (H in FIG. 2) is increased. There was a disadvantage that the oven height of the drying oven had to be increased.

【0005】[0005]

【課題を解決するための手段】本発明は係る課題を解決
するためになされたもので、乾燥炉内の前段部にカテナ
リー方式を採用したカテナリーゾーン(A)とを形成
し、後段部にフローティング方式を採用したフローティ
ングゾーン(B)を有する帯状体の乾燥方法において、
前記フローティングゾーン(B)における複数の上下フ
ローターノズルのうち下部フローターノズルの最前列下
部フローターノズル群の浮上力Fを下記(1)式を満足
するようにしたことを特徴とする帯状体の連続式乾燥方
法である。
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems. A catenary zone (A) employing a catenary system is formed in a front part of a drying furnace, and a floating part is formed in a rear part. In a method for drying a band having a floating zone (B) employing a method,
A continuous belt-shaped body, wherein the floating force F of the lowermost floater nozzle group in the front row of the lower floater nozzles among the plurality of upper and lower floater nozzles in the floating zone (B) is set to satisfy the following expression (1). It is a drying method.

【0006】[0006]

【数2】 (Equation 2)

【0007】 但し、F:最前列下部フローターノズル群の浮上力 t:帯状体の厚み B:帯状体の幅 L:スパン γ:帯状体の比重量 H:カテナリー部支点高さ T:帯状体の張力[0007] Here, F: floating force of the lowermost floater nozzle group in the front row t: thickness of the band B: width of the band L: span γ: specific weight of the band H: catenary fulcrum height T: band of the band tension

【0008】[0008]

【発明の実施の形態】図3は、コーティングロール2と
ロール7によって支持されるカテナリーゾーン(A)に
おける鋼板のカテナリー量を示すが、図3に示すような
両端をコーティングロール2及びロール7によって支持
されるカテナリーゾーンにおいて最下点aとコーティン
グロール間のカテナリー量hは近似的に h=(2l)2 ・γ/(8・T) ・・・・・(2)で
表すことができ、 γ:帯状体の比重量 l:コーティングロール2とa点間の距離 T:帯状体の張力 また、最下点aはカテナリーゾーンの内側にあるから H≦h ・・・・・・・・・・・・・・・・(3)
の関係がある。 H:カテナリー部支点高さ h:a点のカテナリー量
FIG. 3 shows the catenary amount of a steel sheet in a catenary zone (A) supported by a coating roll 2 and a roll 7, and both ends are coated by the coating roll 2 and the roll 7 as shown in FIG. The catenary amount h between the lowest point a and the coating roll in the supported catenary zone can be approximately expressed by h = (2l) 2 · γ / (8 · T) (2), γ: Specific weight of the strip 1: Distance between the coating roll 2 and the point a T: Tension of the strip Also, since the lowest point a is inside the catenary zone, H ≦ h...・ ・ ・ ・ ・ ・ ・ (3)
There is a relationship. H: Catenary part fulcrum height h: Catenary amount at point a

【0009】一方、図2において浮上力Fを最下点aよ
り最前列下部フローターノズル群4側の鋼板自重分F′
を浮上させると仮定すると F≧F′≧t・B・(L−l)・γ ・・・(4) と
表すことができる。 F:最前列下部フローターノズル群の浮上力 t:帯状体の厚み B:帯状体の幅 L:スパン 上記(2)、(3)式より
On the other hand, in FIG. 2, the levitation force F is increased by the weight of the steel sheet F 'on the lowermost floater nozzle group 4 side of the front row from the lowest point a.
F ≧ F ′ ≧ t · B · (L−1) · γ (4) F: Floating force of the front row lower floater nozzle group t: Thickness of the strip B: Width of the strip L: Span From the above formulas (2) and (3)

【0010】[0010]

【数3】 (Equation 3)

【0011】と仮定、近似することができるものであ
る。発明者らはこの仮定、近似式が実用上利用できるこ
とを種々の実験結果より確かめることによって、(1)
式を導いたものである。最前列下部フローターノズル群
の浮上力Fを(請求項1)における(1)式を満足する
ようにすることで鋼板と最前列下部フローターノズル群
の接触を防止する。
It can be assumed and approximated. The present inventors have confirmed from various experimental results that this assumption and the approximation formula can be used for practical purposes.
It is a formula. By setting the floating force F of the front row lower floater nozzle group to satisfy the expression (1) in claim 1, contact between the steel plate and the front row lower floater nozzle group is prevented.

【0012】[0012]

【実施例】図1は、本発明による帯状体の連続式乾燥方
法の実施例を示す。鋼帯1は、コーティングロール2で
表面に塗装され、乾燥炉3にて乾燥、焼付けされる。乾
燥炉3の炉内前段部はカテナリー方式を採用したカテナ
リーゾーン(A)であり、炉内後段側はフローティング
方式を採用したフローティングゾーン(B)としてい
る。フローティングゾーン(B)は、例えばノズルプレ
ートに設けた複数のスリット状の吹き出し口から高圧気
体を噴射させるフローターノズルを利用した最前列下部
フローターノズル群4、下部フローターノズル5及び上
部フローターノズル6から構成されている。最前列下部
フローターノズル群4は、たとえば二組ないし五組のス
リット状の吹き出し口により構成されている。
FIG. 1 shows an embodiment of a continuous drying method for a strip according to the present invention. The steel strip 1 is coated on the surface with a coating roll 2, dried and baked in a drying furnace 3. The former part of the drying furnace 3 is a catenary zone (A) employing a catenary system, and the latter part thereof is a floating zone (B) employing a floating method. The floating zone (B) includes, for example, a lowermost floater nozzle group 4, a lower floater nozzle 5, and an upper floater nozzle 6 in the front row using a floater nozzle for ejecting high-pressure gas from a plurality of slit-shaped outlets provided in a nozzle plate. Have been. The lowermost floater nozzle group 4 in the front row includes, for example, two to five sets of slit-shaped outlets.

【0013】図2は、カテナリーゾーン(A)における
カテナリー量と最前列下部フローターノズル群4の位置
関係を示す説明図である。a点はカテナリー最下点を示
す。例えば、帯状体の厚みt=0.3mm,帯状体の幅
B=1000mm,スパンL=20m,帯状体の比重量
γ=7.85×10-6kg/mm3 ,カテナリー部支点
高さ量H=600mm,帯状体の張力T=2.0kg/
mm2 のとき、最前列下部フローターノズル群の浮上力
Fは(1)式によりF≧5.92kgとなるように設定
する。
FIG. 2 is an explanatory view showing the positional relationship between the amount of catenary and the lowermost floater nozzle group 4 in the front row in the catenary zone (A). Point a indicates the catenary lowest point. For example, the thickness t of the band is 0.3 mm, the width B of the band is 1000 mm, the span L is 20 m, the specific weight of the band is γ = 7.85 × 10 −6 kg / mm 3 , and the height of the catenary support point H = 600 mm, tension of the band T = 2.0 kg /
In the case of mm 2 , the floating force F of the lowermost floater nozzle group in the front row is set so as to satisfy F ≧ 5.92 kg by the equation (1).

【0014】[0014]

【発明の効果】本発明によれば、通板張力が急激に低下
した場合、最前列下部フローターノズル群4の浮上力F
を(請求項1)に示す(1)式の関係を満足するように
設定することで鋼帯1と最前列下部フローターノズル群
4の接触を防止しながらC反り発生を助長することもな
く安定した浮上搬送を可能にすることができ、しかも、
最前列下部フローターノズル群4及び下部フローターノ
ズル5のフロート力を必要以上に大きくする必要がなく
なるからエネルギーコストを抑制することが可能にな
る。
According to the present invention, the floating force F of the lowermost floater nozzle group 4 in the front row can be reduced when the threading force drops rapidly.
Is set so as to satisfy the relation of the expression (1) shown in (claim 1), thereby preventing contact between the steel strip 1 and the lowermost floater nozzle group 4 in the front row and stabilizing without promoting C warpage. Levitation transport is possible, and moreover,
Since it is not necessary to increase the float force of the lowermost floater nozzle group 4 and the lower floater nozzle 5 in the front row more than necessary, energy costs can be reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係わる帯状体の連続式乾燥方法の実施
例を示す図である。
FIG. 1 is a view showing an embodiment of a continuous drying method for a belt-like body according to the present invention.

【図2】カテナリーゾーン(A)におけるカテナリー量
と最前列下部フローターノズル群の位置関係を示す説明
図である。
FIG. 2 is an explanatory diagram showing a positional relationship between a catenary amount and a front row lower floater nozzle group in a catenary zone (A).

【図3】コーティングロールとロールによって支持され
るカテナリーゾーンのカテナリー量を示す説明図であ
る。
FIG. 3 is an explanatory diagram showing a coating roll and a catenary amount of a catenary zone supported by the roll.

【符号の説明】[Explanation of symbols]

1 鋼帯 2 コーティングロール 3 乾燥炉 4 最前列下部フローターノズル群 5 下部フローターノズル 6 上部フローターノズル 7 ロール DESCRIPTION OF SYMBOLS 1 Steel strip 2 Coating roll 3 Drying furnace 4 Front row lower floater nozzle group 5 Lower floater nozzle 6 Upper floater nozzle 7 Roll

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 乾燥炉内の前段部にカテナリー方式を採
用したカテナリーゾーン(A)と、後段部にフローティ
ング方式を採用したフローティングゾーン(B)を有す
る帯状体乾燥方法において、前記フローティングゾーン
(B)における複数の上下フローターノズルのうち下部
フローターノズルの最前列下部フローターノズル群の浮
上力Fを 【数1】 としたことを特徴とする帯状体の連続式乾燥方法。 但し、F:最前列下部フローターノズル群の浮上力 t:帯状体の厚み B:帯状体の幅 L:スパン γ:帯状体の比重量 H:カテナリー部支点高さ T:帯状体の張力
1. A method for drying a strip having a catenary zone (A) adopting a catenary system in a front part of a drying furnace and a floating zone (B) adopting a floating method in a rear part of the drying furnace, wherein the floating zone (B) is provided. ), The floating force F of the lowermost floater nozzle group in the front row of the lower floater nozzle among the plurality of upper and lower floater nozzles is A continuous drying method for a strip-shaped body, characterized in that: Here, F: the lifting force of the lowermost floater nozzle group in the front row t: the thickness of the strip B: the width of the strip L: span γ: the specific weight of the strip H: the height of the catenary fulcrum T: the tension of the strip
JP26410696A 1996-10-04 1996-10-04 Continuous drying method for strips Expired - Fee Related JP3684002B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26410696A JP3684002B2 (en) 1996-10-04 1996-10-04 Continuous drying method for strips

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26410696A JP3684002B2 (en) 1996-10-04 1996-10-04 Continuous drying method for strips

Publications (2)

Publication Number Publication Date
JPH10109058A true JPH10109058A (en) 1998-04-28
JP3684002B2 JP3684002B2 (en) 2005-08-17

Family

ID=17398596

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26410696A Expired - Fee Related JP3684002B2 (en) 1996-10-04 1996-10-04 Continuous drying method for strips

Country Status (1)

Country Link
JP (1) JP3684002B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011106772A (en) * 2009-11-19 2011-06-02 Hirano Tecseed Co Ltd Heat treatment device
CN102380467A (en) * 2011-09-29 2012-03-21 深圳市赢合科技股份有限公司 Oven of coating machine
WO2012091439A2 (en) * 2010-12-28 2012-07-05 Oh Moon Keun Automatic mechanical transmission

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011106772A (en) * 2009-11-19 2011-06-02 Hirano Tecseed Co Ltd Heat treatment device
WO2012091439A2 (en) * 2010-12-28 2012-07-05 Oh Moon Keun Automatic mechanical transmission
WO2012091439A3 (en) * 2010-12-28 2012-12-06 Oh Moon Keun Automatic mechanical transmission
CN102380467A (en) * 2011-09-29 2012-03-21 深圳市赢合科技股份有限公司 Oven of coating machine

Also Published As

Publication number Publication date
JP3684002B2 (en) 2005-08-17

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