JPH074924A - On-line measuring apparatus of sheet thickness - Google Patents
On-line measuring apparatus of sheet thicknessInfo
- Publication number
- JPH074924A JPH074924A JP15422991A JP15422991A JPH074924A JP H074924 A JPH074924 A JP H074924A JP 15422991 A JP15422991 A JP 15422991A JP 15422991 A JP15422991 A JP 15422991A JP H074924 A JPH074924 A JP H074924A
- Authority
- JP
- Japan
- Prior art keywords
- roll
- sheet
- laser beam
- measuring
- shaft
- 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
Links
- 238000006073 displacement reaction Methods 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims description 20
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000006355 external stress Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はシート厚みのオンライン
計測装置に関するものであり、詳しくは、合成樹脂シー
トの他、非導電性シートやフィルム等の厚みをリアルタ
イム方式で測定する厚み計測装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet thickness on-line measuring device, and more particularly to a thickness measuring device for measuring the thickness of a non-conductive sheet, a film or the like in real time in addition to a synthetic resin sheet. Is.
【０００２】[0002]
【従来の技術】一般に合成樹脂シートの製造は、ホッパ
内に投入された合成樹脂ペレットをスクリューフィーダ
で圧送する間にヒータで加熱して溶融させ、Ｔダイのス
リットからエアナイフ上に未硬化のシートとして送出し
た後、冷却硬化させつつ巻取りローラ上に巻き取られ
る。この巻取りローラ上に巻取られる直前または、製造
工程中に、図３に示すように、計測シャフト又はロール
（１）上でシート（２）の厚さをレーザビーム型計測器
（３）によって計測している。このレーザビーム型計測
器（３）は、計測シャフト又はロール（１）を跨いで両
側に投光器（３ａ）と受光器（３ｂ）とを対設し、か
つ、これら投受光器（３ａ）（３ｂ）間に設置したナイ
フエッジ（３ｃ）でレーザビーム（４）の上部を遮光し
て基準点を設定し、このナイフエッジ（３ｃ）から計測
シャフト又はロール（１）の上面までの距離の変化を検
出することにより、シート（２）の厚さを検出するもの
である。具体的に説明すると、投光器（３ａ）が発射す
るレーザビーム（４）の初期長さをＣ、ナイフエッジ
（３ｃ）と計測シャフト又はロール（１）の上面までの
距離をＡ、ナイフエッジ（３ｃ）とシート（２）の上面
までの距離をＢとすると、シート（２）の厚さＤは、Ｄ
＝Ａ−Ｂで表わされる。尚、レーザビーム型計測器
（３）は、ボールねじにより計測シャフト又はロール
（１）の軸方向に平行に配置されたガイド軸に沿って移
動せしめられることによって、シート（２）の幅方向全
長の厚さＤを計測する。この計測値が許容範囲になけれ
ば、Ｔダイのスリット間隔を調整し、所定の厚さＤに調
整される。この計測装置によれば、印刷、色彩の有無に
関係なく非接触で損傷させることなくシートもしくはフ
ィルムの厚みを計測することができる利点がある。2. Description of the Related Art In general, a synthetic resin sheet is manufactured by heating a synthetic resin pellet put into a hopper with a heater to melt it while pressure-fed by a screw feeder, and uncuring the sheet on an air knife through a slit of a T-die. Then, it is wound on a winding roller while being cooled and cured. Immediately before being wound on the winding roller or during the manufacturing process, as shown in FIG. 3, the thickness of the sheet (2) is measured by a laser beam measuring instrument (3) on a measuring shaft or roll (1). I am measuring. This laser beam type measuring device (3) has a light emitter (3a) and a light receiver (3b) provided on opposite sides of the measuring shaft or roll (1) in a pair, and the light emitter and light receiver (3a) (3b). The upper part of the laser beam (4) is blocked by the knife edge (3c) installed between the two) to set the reference point, and the change in the distance from this knife edge (3c) to the upper surface of the measuring shaft or roll (1) is adjusted. By detecting, the thickness of the sheet (2) is detected. Specifically, the initial length of the laser beam (4) emitted by the light projector (3a) is C, the distance between the knife edge (3c) and the upper surface of the measuring shaft or roll (1) is A, and the knife edge (3c). ) And the upper surface of the sheet (2) is B, the thickness D of the sheet (2) is D
= AB. The laser beam measuring instrument (3) is moved by a ball screw along a measuring shaft or a guide axis arranged in parallel to the axial direction of the roll (1), so that the entire length of the seat (2) in the width direction is measured. The thickness D of is measured. If this measured value is not within the allowable range, the slit interval of the T die is adjusted to a predetermined thickness D. According to this measuring device, there is an advantage that the thickness of the sheet or the film can be measured in a non-contact manner without damage regardless of the presence or absence of printing or color.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の計測装置
は、シート（２）の製造に先立って、予め、シート
（２）がない状態でレーザビーム型計測器（３）を計測
シャフト又はロール（１）の一端から他端へ１往復させ
て、そのときのナイフエッジ（３ｃ）から計測シャフト
又はロール（１）の上面までの距離Ａを刻々と計測記憶
させておき、これに基づいて、シート（２）の製造開始
時の距離Ｂを計測することにより、シート（２）の厚さ
Ｄを、Ｄ＝Ａ−Ｂとして求めるものである。SUMMARY OF THE INVENTION In the conventional measuring device described above, the laser beam type measuring instrument (3) is set in advance in the absence of the sheet (2) before the sheet (2) is manufactured. 1) One reciprocation from one end to the other end, the distance A from the knife edge (3c) to the upper surface of the measuring shaft or roll (1) at that time is measured and stored moment by moment, and based on this, the sheet The thickness D of the sheet (2) is determined as D = A-B by measuring the distance B at the start of manufacturing (2).
【０００４】しかし、このような計測方式では、次のよ
うな原因により計測誤差が発生する欠点がある。先ず、
計測シャフト又はロール（１）はシート（２）と接触し
ていることによって、熱変形やテンション等の外力によ
る変形を生じる。同様に、レーザビーム型計測器（３）
の移動ガイド軸やボールねじも熱変形や外力による変形
を生じるため、基準となるＡ寸法に誤差が発生する。さ
らに、移動ガイド軸及び計測シャフト又はロール（１）
に高精度が必要となり、これらの加工及び組付け精度を
向上させなければならず、コストアップを招く欠点があ
る。However, such a measurement method has a drawback that a measurement error occurs due to the following causes. First,
The measurement shaft or the roll (1) is in contact with the sheet (2), so that the measurement shaft or the roll (1) is deformed by an external force such as thermal deformation or tension. Similarly, laser beam measuring instrument (3)
Since the movement guide shaft and the ball screw also undergo thermal deformation and deformation due to external force, an error occurs in the reference A dimension. Furthermore, the movement guide shaft and the measuring shaft or roll (1)
Therefore, high precision is required, and the processing and assembling precisions of these components must be improved, which has a drawback of increasing cost.
【０００５】本発明は、従来の計測装置の上記欠点に鑑
みて開発されたもので、その目的とするところは、簡単
な手段により、熱変形や外部応力等の影響を少なくし、
コストダウンも可能なシート厚みのオンライン計測装置
を提供しようとするものである。The present invention was developed in view of the above-mentioned drawbacks of conventional measuring devices. The purpose of the present invention is to reduce the influence of thermal deformation, external stress, etc. by a simple means.
The present invention aims to provide an online measuring device for sheet thickness, which can reduce cost.
【０００６】[0006]
【課題を解決するための手段】上記課題の解決手段とし
て本発明は、シートの走行方向に直交して配置された計
測シャフト又はロールの上面にシートを接触走行させ、
この計測シャフト又はロールを跨いで両側に対設された
投光器と受光器からなるレーザビーム型計測器により、
シートの厚さをレーザビームの遮光量で計測するシート
厚みのオンライン計測装置において、レーザビーム型計
測器の投光器と受光器間の計測シャフト又はロールの軸
線上方に、この計測シャフト又はロールの上面との距離
の変化を検出する渦電流型変位センサを設置し、かつ、
この渦電流型変位センサをレーザビームの上端を規制す
るナイフエッジと兼用させたものである。As a means for solving the above-mentioned problems, the present invention allows a sheet to travel in contact with the upper surface of a measuring shaft or roll arranged orthogonal to the traveling direction of the sheet,
With a laser beam type measuring device consisting of a light emitter and a light receiver that are oppositely placed on both sides across this measuring shaft or roll,
In the sheet thickness online measuring device that measures the sheet thickness by the amount of light shielded by the laser beam, the upper surface of the measuring shaft or roll is located above the measuring shaft or roll axis between the transmitter and the receiver of the laser beam type measuring instrument. An eddy current type displacement sensor that detects changes in the distance between
This eddy current displacement sensor is also used as a knife edge that regulates the upper end of the laser beam.
【０００７】[0007]
【作用】渦電流型変位センサは、下方に向けて高周波磁
界を発生しており、この高周波磁界内に鉄などの金属で
できた計測シャフト又はロールが存在することによっ
て、電磁誘導により、上記計測シャフト又はロールの上
面との間の距離に応じた渦電流が発生し、この渦電流
は、それ自身を生起させた磁界と逆方向の磁界を発生さ
せ、その結果、もとの磁界が相殺されて弱くなり、この
磁界の変化を計測することにより距離を検出することが
できる。この作用は、シートの有無に関係がないため、
シートの厚みは、投受光器のレーザビームの遮光量の変
化で計測しながら、同時に、ナイフエッジと計測シャフ
ト又はロール上面との間の距離を測定しているため、熱
変形の影響をなくして誤差のない正確な計測が可能とな
る。特に、渦電流型変位センサの検出位置は、レーザビ
ーム型計測器の検出位置と同一線上となっており、高精
度の計測が可能となる。このように、渦電流型変位セン
サによるナイフエッジと計測シャフト又はロールの上面
との距離の計測と、レーザビーム型計測器によるナイフ
エッジとシート上面との距離の計測とを同時に同一位置
で実施することによって、極論すれば、移動ガイド軸や
計測シャフト又はロール等がうねりや撓み等をもってい
たとしても、これらは計測値への影響が少なく、これら
の加工精度や組付け精度が従来に比べてラフであっても
問題がない利点がある。The eddy current displacement sensor generates a high-frequency magnetic field downward, and the measurement shaft or roll made of metal such as iron is present in the high-frequency magnetic field, so that the above-mentioned measurement is performed by electromagnetic induction. An eddy current is generated depending on the distance between the shaft and the upper surface of the roll, and this eddy current generates a magnetic field in a direction opposite to that of the magnetic field which generated itself, and as a result, the original magnetic field is canceled out. The distance can be detected by measuring the change in the magnetic field. This effect has nothing to do with the presence or absence of seats,
The thickness of the sheet is measured by the change in the light shielding amount of the laser beam of the light emitter / receiver, and at the same time, the distance between the knife edge and the measurement shaft or the upper surface of the roll is measured. Accurate measurement without error is possible. In particular, the detection position of the eddy current type displacement sensor is on the same line as the detection position of the laser beam type measuring device, which enables highly accurate measurement. Thus, the measurement of the distance between the knife edge and the upper surface of the measuring shaft or roll by the eddy current displacement sensor and the measurement of the distance between the knife edge and the upper surface of the sheet by the laser beam measuring instrument are simultaneously performed at the same position. Therefore, if it is put to the extreme theory, even if the movement guide shaft, the measurement shaft, the roll, etc. have undulations or deflections, these have little effect on the measured values, and the machining accuracy and assembly accuracy of these are rougher than in the past. Even there is an advantage that there is no problem.
【０００８】[0008]
【実施例】図１は本発明に係るシート厚みのオンライン
計測装置の要部概略側面図、図２はその正面図を示して
おり、同図において、（１）は計測シャフト又はロー
ル、（２）はシート、（３）はレーザビーム型計測器、
（４）はレーザビーム、（５）はナイフエッジ兼渦電流
型変位センサである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic side view of an essential part of an online sheet thickness measuring device according to the present invention, and FIG. 2 is a front view thereof, in which (1) is a measuring shaft or roll, and (2) ) Is a sheet, (3) is a laser beam type measuring instrument,
(4) is a laser beam, and (5) is a knife edge / eddy current displacement sensor.
【０００９】計測シャフト又はロール（１）は、鉄など
の金属製とされ、その有効長はシート（２）の最大幅よ
り長くされ、シート（２）の走行方向に直交して固定又
は回転自在に配置される。The measuring shaft or roll (1) is made of metal such as iron, and its effective length is longer than the maximum width of the seat (2) and is fixed or rotatable orthogonal to the traveling direction of the seat (2). Is located in.
【００１０】シート（２）は、計測シャフト又はロール
（１）の上面に山形に接触して走行するように案内され
る。The seat (2) is guided so as to travel in contact with the upper surface of the measuring shaft or the roll (1) in a chevron shape.
【００１１】レーザビーム型計測器（３）は、計測シャ
フト又はロール（１）を跨いで両側に対設された投光器
（３ａ）と受光器（３ｂ）を有し、この投光器（３ａ）
から発射されるレーザビーム（４）は縦長スリット状で
あって、初期長さＣであり、下部が計測シャフト又はロ
ール（１）の上面及びシート（２）の上面に遮光される
ように配置される。The laser beam type measuring instrument (3) has a light emitter (3a) and a light receiver (3b) which are opposed to each other across the measuring shaft or the roll (1). The light emitter (3a).
The laser beam (4) emitted from is in the form of a vertically elongated slit, has an initial length C, and is arranged such that the lower part is shielded from the upper surface of the measuring shaft or roll (1) and the upper surface of the sheet (2). It
【００１２】ナイフエイジ兼渦電流型変位センサ（５）
は、計測シャフト又はロール（１）の軸線上方で、投光
器（３ａ）と受光器（３ｂ）との間のレーザビーム型計
測器（３）の一部に設置され、計測シャフト又はロール
（１）の上面との距離Ａの寸法変化を検出するものであ
り、同時に、レーザビーム（４）の上端を規制するナイ
フエイジを兼用させている。Knife age and eddy current type displacement sensor (5)
Is installed in a part of the laser beam type measuring device (3) between the light emitter (3a) and the light receiving device (3b) above the axis of the measuring shaft or roll (1). ) Detects the dimensional change of the distance A from the upper surface of (1) and also serves as a knife age for regulating the upper end of the laser beam (4).
【００１３】渦電流型変位センサ（５）の計測原理は、
下方に向けて発生した高周波磁界の強さが、計測シャフ
ト又はロール（１）までの距離に比例して増減すること
を利用するものであって、例えば、図２に示す様に、計
測シャフト又はロール（１）の一端（例えば、始端）で
距離Ａのゼロ点補正を毎回又は適宜行わせるものであ
る。このようにすると、渦電流型変位センサ（５）の温
度特性の変化を補正させることができる。The measurement principle of the eddy current displacement sensor (5) is as follows.
The strength of the high frequency magnetic field generated downward is increased / decreased in proportion to the distance to the measuring shaft or the roll (1). For example, as shown in FIG. The zero point correction of the distance A is performed at one end (for example, the start end) of the roll (1) every time or as appropriate. By doing so, it is possible to correct the change in the temperature characteristic of the eddy current displacement sensor (5).
【００１４】渦電流型変位センサ（５）と一体的にレー
ザビーム型計測器（３）は、計測シャフト又はロール
（１）と平行に配置された移動ガイド軸（図示省略）に
沿ってボールねじ等の送り手段（図示省略）により移動
可能とされている。The laser beam type measuring device (3) integrally with the eddy current type displacement sensor (5) has a ball screw along a moving guide shaft (not shown) arranged parallel to the measuring shaft or the roll (1). It can be moved by a feeding means (not shown) such as.
【００１５】本発明は以上の構成からなり、次に、その
動作を説明する。The present invention has the above-mentioned structure, and its operation will be described below.
【００１６】レーザビーム型計測器（３）及び渦電流型
変位センサ（５）は定位置に停止したまま、或いは、計
測シャフト又はロール（１）の軸方向に移動しながらシ
ート（２）の厚さＤを計測する。この計測は、先ず、渦
電流型変位センサ（５）によって計測シャフト又はロー
ル（１）の上面までの距離Ａを磁界の変化で検出し、同
時に、投光器（３ａ）から発射されるレーザビーム
（４）が受光器（３ｂ）に入射する縦長方向の間隔、即
ち、渦電流型変位センサ（５）の下面からシート（２）
の上面までの距離Ｂをレーザビームの遮光量の変化で検
出し、これらからＤ＝Ａ−Ｂとして、シート（２）の厚
さを検出させるものである。この検出値は、マイコン内
蔵の演算制御部に送信され、夫々の値を計測シャフト又
はロール（１）の軸方向各位置に対応させたシート
（２）の厚さの実測値としてディスプレイ画面に表示
し、かつ、記録し、さらにプリントアウト可能とされ
る。The laser beam type measuring device (3) and the eddy current type displacement sensor (5) are stopped at fixed positions, or while moving in the axial direction of the measuring shaft or roll (1), the thickness of the sheet (2) is increased. Measure D. In this measurement, first, the eddy current displacement sensor (5) detects the distance A to the upper surface of the measurement shaft or roll (1) by the change of the magnetic field, and at the same time, the laser beam (4) emitted from the projector (3a) is detected. ) Is incident on the light receiver (3b) in the longitudinal direction, that is, from the lower surface of the eddy current displacement sensor (5) to the sheet (2).
The distance B to the upper surface of the sheet (2) is detected by the change in the light shielding amount of the laser beam, and the thickness of the sheet (2) is detected by setting D = AB. This detected value is transmitted to the arithmetic control unit with a built-in microcomputer, and is displayed on the display screen as an actual measurement value of the thickness of the sheet (2) in which each value is associated with each axial position of the measuring shaft or roll (1). In addition, it is possible to record and print out.
【００１７】[0017]
【発明の効果】本発明によれば、ナイフエッジとシート
上面との距離をレーザビーム型計測器のレーザビームの
遮光量変化で検出すると同時に、ナイフエッジと計測シ
ャフト又はロールの上面との距離を渦電流型変位センサ
の磁界変化で検出させることができるため、熱変形等に
影響されることなくシートの厚みを正確に検出すること
ができる。特に、渦電流型変位センサとナイフエッジを
兼用させたことにより、レーザビーム型計測器の計測位
置と同一位置で渦電流型変位センサの計測を行わせたか
ら、高精度の計測が可能となる。しかも、計測シャフト
又はロールや移動ガイド軸の加工及び組付け精度が従来
に比べてラフであっても影響力が非常に少ないため、装
置のコストダウンも可能となる。According to the present invention, the distance between the knife edge and the upper surface of the sheet is detected by the change in the light shielding amount of the laser beam of the laser beam type measuring device, and at the same time, the distance between the knife edge and the upper surface of the measuring shaft or roll is measured. Since it can be detected by the magnetic field change of the eddy current displacement sensor, the thickness of the sheet can be accurately detected without being affected by thermal deformation or the like. In particular, since the eddy current displacement sensor is also used as the knife edge, the eddy current displacement sensor is measured at the same position as the measurement position of the laser beam type measuring instrument, which enables highly accurate measurement. In addition, even if the processing and assembly accuracy of the measurement shaft or roll or the movement guide shaft is rougher than in the conventional case, the influence is very small, so that the cost of the device can be reduced.
【図１】本発明に係るシート厚みのオンライン計測装置
の要部概略側面図FIG. 1 is a schematic side view of a main portion of an online sheet thickness measuring device according to the present invention.
【図２】その正面図[Figure 2] Front view
【図３】従来装置の要部概略側面図FIG. 3 is a schematic side view of a main part of a conventional device.
１ 計測シャフト又はロール ２ シート ３ レーザビーム型計測器 ３ａ 投光器 ３ｂ 受光器 ４ レーザビーム ５ ナイフエッジ兼渦電流型変位センサ 1 Measuring Shaft or Roll 2 Sheet 3 Laser Beam Type Measuring Instrument 3a Emitter 3b Photodetector 4 Laser Beam 5 Knife Edge and Eddy Current Type Displacement Sensor
Claims (1)
計測シャフト又はロールの上面にシートを接触走行さ
せ、この計測シャフト又はロールを跨いで両側に対設さ
れた投光器と受光器からなるレーザビーム型計測器によ
り、シートの厚さをレーザビームの遮光量で計測するシ
ート厚みのオンライン計測装置において、 レーザビーム型計測器の投光器と受光器間の計測シャフ
ト又はロールの軸線上方に、この計測シャフト又はロー
ルの上面との距離の変化を検出する渦電流型変位センサ
を設置し、かつ、この渦電流型変位センサをレーザビー
ムの上端を規制するナイフエッジと兼用させたことを特
徴とするシート厚みのオンライン計測装置。1. A laser comprising a light emitter and a light receiver arranged on both sides of the measuring shaft or roll, the sheet being brought into contact with the upper surface of a measuring shaft or roll arranged orthogonally to the traveling direction of the sheet. In an online sheet thickness measurement device that measures the sheet thickness by the beam-shielding amount of the laser beam using a beam type measuring device, the sheet thickness is measured above the axis of the measuring shaft or roll between the transmitter and the receiver of the laser beam type measuring device. An eddy current type displacement sensor for detecting a change in the distance from the measurement shaft or the upper surface of the roll is installed, and this eddy current type displacement sensor is also used as a knife edge for regulating the upper end of the laser beam. Sheet thickness online measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3154229A JPH0830647B2 (en) | 1991-06-26 | 1991-06-26 | Sheet thickness online measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3154229A JPH0830647B2 (en) | 1991-06-26 | 1991-06-26 | Sheet thickness online measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH074924A true JPH074924A (en) | 1995-01-10 |
| JPH0830647B2 JPH0830647B2 (en) | 1996-03-27 |
Family
ID=15579675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3154229A Expired - Fee Related JPH0830647B2 (en) | 1991-06-26 | 1991-06-26 | Sheet thickness online measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0830647B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003114108A (en) * | 2001-10-02 | 2003-04-18 | Fuji Photo Film Co Ltd | Thickness measuring method for thickening treatment part and thickening treatment method for web |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5381151A (en) * | 1976-12-27 | 1978-07-18 | Oki Electric Ind Co Ltd | Surface film thickness detector |
| JPS5550106A (en) * | 1978-10-04 | 1980-04-11 | Dow Chemical Co | Method and device for measuring quantity of paint on body |
| JPS5644803A (en) * | 1979-09-21 | 1981-04-24 | Bridgestone Corp | System measuring for thickness of nonmetallic sheet like object |
-
1991
- 1991-06-26 JP JP3154229A patent/JPH0830647B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5381151A (en) * | 1976-12-27 | 1978-07-18 | Oki Electric Ind Co Ltd | Surface film thickness detector |
| JPS5550106A (en) * | 1978-10-04 | 1980-04-11 | Dow Chemical Co | Method and device for measuring quantity of paint on body |
| JPS5644803A (en) * | 1979-09-21 | 1981-04-24 | Bridgestone Corp | System measuring for thickness of nonmetallic sheet like object |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003114108A (en) * | 2001-10-02 | 2003-04-18 | Fuji Photo Film Co Ltd | Thickness measuring method for thickening treatment part and thickening treatment method for web |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0830647B2 (en) | 1996-03-27 |
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