JP7291109B2 - 紙ウェブの測定装置及び方法 - Google Patents
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Description
本発明は、移動する紙ウェブの測定装置及び方法に関する。
紙ウェブの特定の物理的性質を光学的に評価する試みがなされてきた。しかしながら、紙ウェブからのいくつかの物理的性質の組み合わせの光学測定は失敗したか、又はあまりにも信頼性が低いと判明した。
本発明は、改善された測定を提供することを目的とする。本発明は、独立請求項によって定義される。実施形態は、従属請求項において定義される。
以下の実施形態は単なる例である。本明細書はいくつかの場所で「1つの」実施形態を参照する場合があるが、これは、そのような参照のそれぞれが同じ実施形態(複数可)を指すこと、又は特徴が単一の実施形態にのみ適用されることを必ずしも意味しない。異なる実施形態の単一の特徴を組み合わせて、他の実施形態を提供することもできる。さらに、「comprising」及び「including」という言葉は、説明された実施形態を限定して、言及された特徴のみからなるものとして理解されるべきであり、そのような実施形態は、具体的に言及されていない特徴/構造も含有し得る。実施形態のすべての組み合わせは、それらの組み合わせが構造的又は論理的矛盾を引き起こさない場合に可能であると見なされる。
802 方向づけるステップ
804 散乱させるステップ
806 受け取るステップ
808 決定するステップ
Claims (13)
- 移動する紙ウェブの測定装置であって、
当該測定装置は、当該測定装置の散乱要素(104)に向けて光放射を出力するように構成された光放射源(102)を含み、
前記散乱要素(104)は、前記光放射を散乱するように構成され、前記散乱要素(104)の透過面(104A)は、前記光放射を前記移動する紙ウェブ(100)に向けて散乱するように方向付けるように構成され、
前記散乱要素(104)の前記透過面(104A)と前記紙ウェブ(100)の表面との間の距離(D)は既知であり、前記透過面(104A)及び当該測定装置の検出器(106)の間に、前記紙ウェブ(100)があり、
前記検出器は、前記移動する紙ウェブ(100)の標的領域(100A)から側方散乱される前記光放射の少なくとも一部を受け取り、且つ前記移動する紙ウェブ(100)を介して散乱することなく直接通過した前記光放射を拒絶するように構成され、前記散乱要素(104)は、前記光放射を前記標的領域(100A)に散乱させるように構成され、前記側方散乱される光放射は、前記紙ウェブ(100)の法線の方向から少なくとも所定の角度だけ逸脱し、
前記検出器(106)は、受け取った光放射に関するスペクトル情報及び前記既知の距離(D)に基づいて、前記紙ウェブ(100)の水分値及び乾燥重量を決定するように構成される、測定装置。 - 前記検出器(106)は、前記紙ウェブ(100)の法線(N1)の方向から少なくとも所定の量だけ逸脱する方向からのみ前記側方散乱される光放射を受け取るように構成される、請求項1に記載の測定装置。
- 前記検出器(106)は前記側方散乱される光放射の光線を受け取るように構成され、前記検出器に入射する光線の方向が、前記紙ウェブ(100)の法線(N1)の方向から、前方散乱される光放射(110)の角度偏差(ND)に対応する少なくとも角度だけ逸脱する、請求項1に記載の測定装置。
- 前記検出器(106)は前記側方散乱される光放射の光線を受け取るように構成され、前記検出器に入射する光線の方向が、前記紙ウェブ(100)の前記法線(N1)の方向から少なくとも8°ずれている、請求項1に記載の測定装置。
- 当該測定装置は距離配置(200)を含み、前記距離配置(200)は、前記散乱要素(104)の透過面(104A)と前記紙ウェブ(100)の表面との間の距離を一定に保つように構成される、請求項1に記載の測定装置。
- 前記散乱要素(104)の前記透過面(104A)と前記紙ウェブ(100)とが互いに接触するように構成される、請求項1又は4に記載の測定装置。
- 当該測定装置は距離測定ユニット(204)を含み、前記距離測定ユニット(204)は、前記散乱要素(104)の透過面(104A)と前記紙ウェブ(100)の表面との間の前記距離(D)を測定するように構成され、前記検出器(106)は、前記紙ウェブ(100)の水分値及び乾燥重量の決定における前記距離(D)の変動の影響を補償するように構成される、請求項1に記載の測定装置。
- 前記距離測定ユニット(204)は、前記散乱要素(104)の透過面(104A)と前記紙ウェブ(100)の表面との間の傾斜を測定するように構成され、前記検出器(106)は、前記紙ウェブ(100)の水分値及び乾燥重量の決定における前記傾斜の影響を補償するように構成される、請求項7に記載の測定装置。
- 前記散乱要素(104)は、空気又はガスを前記検出器(106)に向けて出力するための第1の開口部(222)を含む、請求項1に記載の測定装置。
- 前記検出器(106)は、空気又はガスを前記散乱要素(104)に向けて出力するための第2の開口部(232)を含む、請求項1に記載の測定装置。
- 前記散乱要素(104)の前記透過面(104A)の法線(N2)が、前記紙ウェブ(100)の法線(N1)に平行である、請求項1に記載の測定装置。
- 前記検出器(106)は、1つ以上のプロセッサ(700)、及びコンピュータプログラムコードを包含する1つ以上のメモリ(702)を含み、
前記1つ以上のメモリ(702)及び前記コンピュータプログラムコードは、前記1つ以上のプロセッサ(700)を用いて、当該測定装置に、少なくとも、受け取った光放射に関するスペクトル情報に基づいて前記紙ウェブ(100)の水分値及び乾燥重量の決定を行わせるように構成される、請求項1に記載の測定装置。 - 移動する紙ウェブ(100)を測定する方法であって、
光放射源(102)によって光放射を散乱要素(104)に向けて出力すること(800)、
前記散乱要素(104)によって前記光放射を散乱すること(802)、
前記散乱要素(104)の透過面(104A)によって、前記光放射を前記移動する紙ウェブ(100)の標的領域(100A)に向かって散乱するように方向付けること(804)であって、前記散乱要素(104)の前記透過面(104A)と前記紙ウェブ(100)の表面との間の距離は既知であり、前記透過面(104A)及び装置の検出器(106)の間に、前記紙ウェブ(100)がある、こと、
前記検出器(106)によって、前記移動する紙ウェブ(100)の前記標的領域(100A)から側方散乱される前記光放射の少なくとも一部を受け取ること、及び前記移動する紙ウェブ(100)を介して散乱することなく直接通過した前記光放射を拒絶することであって、前記側方散乱される光放射は、前記紙ウェブ(100)の法線の方向から少なくとも所定の角度だけ逸脱する、こと、並びに
受けとった光放射に関するスペクトル情報及び前記既知の距離に基づいて、前記紙ウェブ(100)の水分値及び乾燥重量を前記検出器(106)によって決定すること(808)、を行う、測定する方法。
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FI20195795A FI130248B (en) | 2019-09-23 | 2019-09-23 | Measuring device and method for a paper web |
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JP2016011920A (ja) | 2014-06-30 | 2016-01-21 | 横河電機株式会社 | 赤外線水分計 |
US20160122946A1 (en) | 2013-05-29 | 2016-05-05 | Valmet Automation Oy | Measurement of web |
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JPS6246358U (ja) * | 1985-09-04 | 1987-03-20 | ||
US8975586B2 (en) | 2011-06-06 | 2015-03-10 | Honeywell Asca Inc. | Diffusing measurement window for near and mid IR multichannel sensor |
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US20150136993A1 (en) | 2012-05-25 | 2015-05-21 | Metso Automation Oy | Sheet measurement |
US20160122946A1 (en) | 2013-05-29 | 2016-05-05 | Valmet Automation Oy | Measurement of web |
JP2016011920A (ja) | 2014-06-30 | 2016-01-21 | 横河電機株式会社 | 赤外線水分計 |
US20160282277A1 (en) | 2015-03-24 | 2016-09-29 | Honeywell Asca Inc. | Spectroscopic Sensor for Thickness or Weight Measurement of Thin Plastic Films |
WO2019173900A1 (en) | 2018-03-14 | 2019-09-19 | Honeywell Limited | Scanning caliper and basis weight sensor for sheet product using terahertz |
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JP2021051071A (ja) | 2021-04-01 |
US20210088500A1 (en) | 2021-03-25 |
CN112540049A (zh) | 2021-03-23 |
DE102020122393A1 (de) | 2021-03-25 |
FI20195795A1 (en) | 2021-03-24 |
FI130248B (en) | 2023-05-08 |
US11841357B2 (en) | 2023-12-12 |
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