WO2020054574A1 - Inspection method and inspection device - Google Patents

Inspection method and inspection device Download PDF

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Publication number
WO2020054574A1
WO2020054574A1 PCT/JP2019/034996 JP2019034996W WO2020054574A1 WO 2020054574 A1 WO2020054574 A1 WO 2020054574A1 JP 2019034996 W JP2019034996 W JP 2019034996W WO 2020054574 A1 WO2020054574 A1 WO 2020054574A1
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Prior art keywords
crumb
temperature
polymer
excess moisture
detected
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PCT/JP2019/034996
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French (fr)
Japanese (ja)
Inventor
祐介 河津
諒 難波
誠 野瀬
俊文 藤岡
浩之 物部
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宇部興産株式会社
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Priority to JP2020545970A priority Critical patent/JP6982281B2/en
Priority to KR1020217004833A priority patent/KR102516475B1/en
Priority to CN201980053751.0A priority patent/CN112585466A/en
Publication of WO2020054574A1 publication Critical patent/WO2020054574A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/44—Resins; Plastics; Rubber; Leather
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention is a technique for inspecting the presence or absence of moisture in a crumb-like polymer supplied and transferred.
  • a butadiene solution as a raw material is prepared, a catalyst is added, and polymerization is performed to obtain a polymer solution (polymerization step).
  • the obtained polymer solution is subjected to steam treatment, and a polymer in the form of a crumb slurry is recovered (solvent removing step).
  • the polymer containing water is dehydrated by an extruder, and dried by hot air or the like to form a dry crumb (dehydration / drying step).
  • the crumb-shaped polymer is compressed and molded (molding step).
  • grains having a particle size of about 3 to 10 mm generated in the process of producing synthetic rubber are called crumbs.
  • the present invention relates to a molding process.
  • the molding process will be described in more detail.
  • a crumb-shaped or powdered semi-finished product is a press-formed product (usually referred to as a veil, hereinafter referred to as a veil) having a rectangular parallelepiped shape by a press molding machine (usually referred to as a baler, hereinafter referred to as a baler). ).
  • the crumb-shaped polymer is automatically weighed and adjusted to the specified weight range. It is molded into a bale in the specified weight range, the weight is checked, and the rubber veil is covered with a thin film wrapper such as polyethylene film or polystyrene film, and a plurality of containers are stored in storage containers such as containers and shipped to users. You.
  • the bale is melted or dissolved, vulcanized and processed on the user side.
  • Patent Literature 1 by using an infrared transmitting transparent plate having a smooth surface and pressing rubber while irradiating infrared light to the sample rubber through the transparent plate, the water content of the sample rubber can be reduced in a short time, and Techniques that can measure accurately have been proposed.
  • the inventor of the present application has studied the mechanism of excess moisture remaining, and as a result, it is difficult to predict whether excess moisture remains or not, and it is difficult to predict that the moisture content of the sample rubber is equal to or less than a predetermined value. On the basis, it can be difficult to conclude that the product veil does not contain excess moisture.
  • the present invention has been made in view of the above problems, and has as its object to provide an inspection technique capable of detecting excess moisture after a dehydration / drying step and before molding.
  • the present invention for solving the above-mentioned problems is an inspection method for continuously supplying a crumb-like polymer that has been polymerized and dehydrated and dried, and detects crumbs containing excess moisture in the crumb-like polymer.
  • the temperature of the crumb-like polymer is measured, and the crumb containing excess moisture is detected based on the temperature difference.
  • the temperature at each measurement point is measured, the average temperature of a plurality of measurement points is obtained, and the crumb corresponding to the measurement point having a temperature lower than the average temperature is obtained. Is detected.
  • a crumb corresponding to a measurement point having a temperature difference from the average temperature of 9.5 ° C. or more is detected.
  • the average temperature of the polymer when the dehydrated and dried crumb-like polymer is supplied is 40 to 70 ° C.
  • the crumb containing excess moisture is in a lump.
  • the crumb containing excess moisture has a moisture content of 1% by mass or more.
  • the present invention for solving the above-mentioned problems is a supply means for continuously supplying a polymerized, dehydrated and dried crumb-shaped polymer, a temperature measuring means for measuring the temperature of the crumb-shaped polymer supplied from the supply means, A determination means for calculating a temperature difference from the average temperature using the temperature measurement means and detecting a crumb containing excess moisture based on the temperature difference.
  • the excess moisture inspection means is a thermographic camera.
  • the present invention can detect excess moisture after the dehydration / drying step and before molding.
  • FIG. 1 is a system configuration diagram according to an embodiment of the present invention.
  • 4 is a verification test result that is a basis for the basic concept of the present invention. It is a detection example concerning one embodiment of the present invention.
  • FIG. 1 is a system configuration diagram according to an embodiment of the present invention.
  • the system includes a continuous supply unit, an excess moisture inspection unit, a bale-equivalent weight measuring unit, a bale forming unit, a carrying-out unit, and a control unit, and performs a series of operations.
  • the continuous supply means is, for example, the vibration feeder 1. After the polymerization, the vibration feeder 1 continuously supplies the crumb-shaped polymer 2 that has undergone the dehydration / drying step 8 to the system.
  • the excess moisture inspection means is, for example, a thermographic camera 3.
  • the thermographic camera 3 is provided on the vibrating feeder 1 and detects excess moisture by detecting temperature rise due to insufficiently dried crumbs (described later in detail).
  • the veil-equivalent weight measuring means is, for example, a weighing device 6 having a hopper.
  • the hopper is provided between the continuous feeding means and the bale forming means.
  • the hopper has an upper hopper and a lower hopper. The operations of the upper hopper and the lower hopper are controlled, and the weight of the crumb-like polymer accumulated in the hopper by the weighing device 6 is measured to measure the weight of the crumb-like polymer equivalent to the veil.
  • the bale forming means is, for example, a pressure forming machine (baler) 7.
  • the crumb-shaped polymer measured by the bale-equivalent weight measuring means is supplied and pressed to form a veil.
  • the unloading means is, for example, the conveyor 14.
  • a weight measuring device 15 is provided in the middle of the conveyor 14.
  • the control device 30 inputs the excess moisture inspection information from the excess moisture inspection means 3 and the bale weight information from the weight measuring device 15 and performs sorting control. In other words, no excess moisture is detected, and a bale having a weight in a normal range is carried out to the next step (packing step) 9 as a regular product 12, and a veil in which excess moisture is detected and / or a weight outside the normal range is removed. It is removed as a nonstandard product 13 and sent to another process 10 (reprocessing).
  • FIG. 2 shows verification test results that are the basis of the basic concept of the present invention.
  • the vertical axis in FIG. 2 is the moisture content (mass%) of crumb, and the horizontal axis is a numerical value obtained from [(WP surface temperature) ⁇ (average crumb temperature)].
  • the WP surface temperature is a measured temperature of a portion of the crumb that is assumed to contain excess moisture
  • the crumb average temperature is an average temperature of a plurality of measurement points.
  • the average temperature of the crumb-like polymer continuously supplied to the molding step via the dehydration / drying step is 40 to 70 ° C. More specifically, in a verification test performed in winter, the average temperature of the crumb-shaped polymer was 48.8 ° C., whereas in a verification test performed in summer, the average temperature of the crumb-shaped polymer was 60.80 ° C. 7 ° C.
  • the average outside temperature in winter at the verification test site is around 6 ° C, and the average outside temperature in summer is around 26 ° C.
  • the average temperature of the crumb-like polymer after the dehydration / drying step is affected by the ambient temperature.
  • crumbs containing excess water tended to form lumps.
  • the portion of the mass containing excess moisture was defined as WET POINT (WP). While the crumb after the dehydration / drying step is relatively hot, crumbs containing excess moisture take away the heat of the crumb when the moisture evaporates, or the temperature is less likely to rise due to the addition of excess moisture. It is supposed to be.
  • the crumb surface temperature is 48.8 ° C and the WP is 35.4 ° C (the temperature difference between the crumb surface temperature and the WP is 13.4 ° C) in winter, and the crumb surface temperature is 60.7 ° C and WP47. 4 ° C. (13.3 ° C. between the crumb surface temperature and the WP).
  • ⁇ Detection of crumb (WET POINT) containing excess water ⁇ WET POINT is detected based on the temperature difference. More specifically, a WET POINT can be detected by determining an average temperature of a plurality of measurement points of the crumb and setting a measurement point having a temperature lower than the average temperature as a WET POINT.
  • WET POINT By setting a measurement point portion having a difference from the average temperature of 9.5 ° C. or more as WET POINT, WET POINT can be detected with higher accuracy.
  • the average temperature of a pea crumb can be determined, for example, by the following method.
  • Fig. 3 shows an example of temperature measurement.
  • the temperature measuring means is a thermographic camera. Imaging at 30 frames / sec is possible.
  • thermographic camera 3 for example, CPA-L25B manufactured by Chino can be used.
  • the crumb is photographed and imaged by a thermographic camera, and the temperature of each image in each image is measured in a pixel range (dotted line in the drawing) corresponding to a predetermined range (eg, 600 mm ⁇ 500 mm).
  • the average temperature of the crumb can be obtained from the measured temperature of each pixel.
  • the measuring point is preferably 100 to 100,000, more preferably 1,000 to 100,000, and particularly preferably 10,000 to 100,000.
  • WET POINT can be detected with high accuracy.
  • WET @ POINT is detected by extracting a low-temperature pixel having a temperature lower than a predetermined value (for example, 9.5 ° C.) from the average temperature.
  • Small pieces containing water may be peeled off by some kind of cutting, and mixed into crumbs supplied to the next step (molding step).
  • the present application is suitable for detecting WET POINT, the present invention is not limited to crumb lumps but can be applied to crumbs.
  • the general crumb particle size is 3 to 10 mm.
  • a particle size of 20 mm or more is called a crumb lump.
  • the excess moisture can be detected after the dehydration / drying step and before bale molding. As a result, excess moisture inside the bale can also be detected.
  • the crumb-shaped polymer has tackiness, and the particles tend to stick to each other. As a result, the particle size becomes uneven and the behavior is hard to predict. A complicated mechanism is required to remove the crumb-like polymer containing excess moisture in the falling trajectory to the baler. On the other hand, if the veil containing excess moisture is removed after bale molding, it can be easily and reliably removed.
  • thermographic camera no configuration or process other than the thermographic camera and simple control is required. Excess moisture can be easily and reliably detected without adding a new configuration or a new process to an existing manufacturing process. It does not affect product quality.
  • the crumb-like polymer to be veiled is a vulcanizable rubber such as natural rubber (NR), isoprene rubber (IR), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), butyl rubber (IIR), nitrile rubber (NBR), ethylene / propylene rubber (EPM, EPDM), chlorosulfonated polyethylene rubber (CSM), acrylic rubber (ACM), urethane rubber (U), silicone rubber (VMQ) , PVMQ, FVMQ), fluoro rubber (FKM), polysulfide rubber (T) and the like.
  • the present invention is most suitably applied to butadiene rubber (BR). In the verification test, butadiene rubber was used.
  • the average temperature of the crumb-like polymer continuously supplied to the molding step via the dehydration / drying step is 40 to 70 ° C.
  • the average temperature was 48.8 ° C.
  • the average temperature was 60.7 ° C.
  • the water content of the crumb-like polymer was examined. Crumbs near or above average have very low moisture content.
  • the temperature of the crumb was lower than the average, especially when the temperature difference from the average temperature was 9.5 ° C. or more, the water content was remarkably high.
  • the temperature of the mass of the crumb containing excess moisture was 35.4 ° C.

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Abstract

Provided is an inspection technology capable of detecting excessive moisture prior to molding after a dehydration/drying step. This method for inspecting crumb-like polymers is characterized by comprising: continuously supplying a crumb-like polymer that has been polymerized, dehydrated, and dried; and detecting crumbs containing excessive moisture in the crumb-like polymer.

Description

検査方法および検査装置Inspection method and inspection device
　本発明は、供給移送されるクラム状のポリマー中の水分の有無を検査する技術である。 The present invention is a technique for inspecting the presence or absence of moisture in a crumb-like polymer supplied and transferred.
　クラム状のポリマーの製造プロセスの一例として、ブタジエンゴム等の合成ゴムの製造プロセスについて簡単に説明する。 As an example of a process for producing a crumb-shaped polymer, a process for producing a synthetic rubber such as butadiene rubber will be briefly described.
　原料であるブタジエン溶液を調製し触媒を添加して重合しポリマー溶液とする（重合工程）。得られたポリマー溶液をスチーム処理し、クラムスラリー状のポリマーを回収する（脱溶剤工程）。水分を含んだポリマーを押し出し機により脱水し、熱風等により乾燥させ、乾燥クラム状にする（脱水／乾燥工程）。クラム状のポリマーを圧縮して成型する（成型工程）。なお、一般的には、合成ゴムの製造過程において生成される粒径３～１０ｍｍ程度の粒をクラムと呼ぶ。 (4) A butadiene solution as a raw material is prepared, a catalyst is added, and polymerization is performed to obtain a polymer solution (polymerization step). The obtained polymer solution is subjected to steam treatment, and a polymer in the form of a crumb slurry is recovered (solvent removing step). The polymer containing water is dehydrated by an extruder, and dried by hot air or the like to form a dry crumb (dehydration / drying step). The crumb-shaped polymer is compressed and molded (molding step). Generally, grains having a particle size of about 3 to 10 mm generated in the process of producing synthetic rubber are called crumbs.
　本願発明は成型工程に係るものである。成型工程についてもう少し詳しく説明する。 発 明 The present invention relates to a molding process. The molding process will be described in more detail.
　クラム状又は粉末状の半製品は、プレス成型機（通常ベーラーと称されており、以下ベーラーと言う）で直六面体の形状を有するプレス成型品（通常ベールと称されており、以下ベールと言う）にプレス成型される。 A crumb-shaped or powdered semi-finished product is a press-formed product (usually referred to as a veil, hereinafter referred to as a veil) having a rectangular parallelepiped shape by a press molding machine (usually referred to as a baler, hereinafter referred to as a baler). ).
　その際、自動的にクラム状のポリマーは計量され、規定重量範囲に調整される。規定重量範囲のベールに成型され、重量をチェックされ、ゴムベールはポリエチレンフイルム、ポリスチレンフイルムなどの薄膜包袋により被覆され、コンテナーなどの収納用容器に複数個を収納されて、ユーザーに向けて出荷される。 At that time, the crumb-shaped polymer is automatically weighed and adjusted to the specified weight range. It is molded into a bale in the specified weight range, the weight is checked, and the rubber veil is covered with a thin film wrapper such as polyethylene film or polystyrene film, and a plurality of containers are stored in storage containers such as containers and shipped to users. You.
　なお、ユーザー側においてベールは溶融又は溶解され、加硫され、加工される。 The bale is melted or dissolved, vulcanized and processed on the user side.
　以上のように、合成ゴムの製造プロセスでは、必ず水分が用いられるため、脱水／乾燥工程において水分を除去している。しかしながら、実際には、脱水／乾燥工程において除去しきれなかった水分が残存する。過剰水分を含むベールでは、外観上の不具合が生じたり、ユーザー側で不具合が生じたりするおそれがある。 As described above, since water is always used in the synthetic rubber manufacturing process, water is removed in the dehydration / drying step. However, actually, water that cannot be completely removed in the dehydration / drying process remains. A veil containing excessive moisture may cause a defect in appearance or a problem on the user side.
　これに対し、従来の一般的な成型工程では、ベール成型後搬出前に、監視員による外観目視検査により、過剰水分を含むベールを検出している。しかしながら、ベール内部の過剰水分については、監視員は検出できない。また、監視員の負担も大きい。 On the other hand, in the conventional general molding process, a veil containing excess moisture is detected by visual inspection by a monitoring person before the carry-out after bale molding. However, the observer cannot detect the excess moisture inside the bale. Also, the burden on the guards is heavy.
　特許文献１では、平滑面を有する赤外線透過透明板を用いて、ゴムを押圧しながら、透明板を介して試料ゴムに赤外線を照射することにより、試料ゴムの水分含有率を短時間に、しかも精度よく測定できる技術が提案されている。 In Patent Literature 1, by using an infrared transmitting transparent plate having a smooth surface and pressing rubber while irradiating infrared light to the sample rubber through the transparent plate, the water content of the sample rubber can be reduced in a short time, and Techniques that can measure accurately have been proposed.
特開２００４－０２０１９２号公報JP 2004-020192 A
　特許文献１に係る技術によれば、試料ゴムの水分含有率を測定し、所定値以下であることを確認することにより、製品となるベールも過剰水分が含まれていないと推測できる。 According to the technique disclosed in Patent Document 1, by measuring the moisture content of the sample rubber and confirming that the moisture content is equal to or less than a predetermined value, it can be estimated that the veil serving as a product does not contain excess moisture.
　しかしながら、本願発明者は、過剰水分が残存するメカニズムについて検討した結果、過剰水分が残存するか否かは規則性が低く、予測が難しく、試料ゴムの水分含有率が所定値以下であることを根拠に、製品となるベールにも過剰水分が含まれていないと断定するのは難しいと考えられる。 However, the inventor of the present application has studied the mechanism of excess moisture remaining, and as a result, it is difficult to predict whether excess moisture remains or not, and it is difficult to predict that the moisture content of the sample rubber is equal to or less than a predetermined value. On the basis, it can be difficult to conclude that the product veil does not contain excess moisture.
　本発明は、上記問題点に鑑みてなされたものであり、脱水／乾燥工程の後、成型前に過剰水分を検出できる検査技術を提供することを目的とする。 The present invention has been made in view of the above problems, and has as its object to provide an inspection technique capable of detecting excess moisture after a dehydration / drying step and before molding.
　上記課題を解決する本発明は、重合し脱水乾燥したクラム状のポリマーを連続的に供給し、前記クラム状のポリマー内の過剰水分を含むクラムを検出する検査方法である。 The present invention for solving the above-mentioned problems is an inspection method for continuously supplying a crumb-like polymer that has been polymerized and dehydrated and dried, and detects crumbs containing excess moisture in the crumb-like polymer.
　ベール成型前のクラム状において過剰水分を含むクラムを検出することで、従来検知できなかったベール内部に含まれる過剰水分を検出できる。 By detecting crumbs containing excess moisture in a crumb shape before bale molding, excess moisture contained inside the veil, which could not be detected conventionally, can be detected.
　上記発明において好ましくは、前記クラム状のポリマーの温度を測定し、温度差に基づいて過剰水分を含むクラムを検出する。 In the above invention, preferably, the temperature of the crumb-like polymer is measured, and the crumb containing excess moisture is detected based on the temperature difference.
　上記発明において好ましくは、連続的に供給されるクラム状のポリマーに対し、測点ごとの温度を測定し、複数の測点の平均温度を求め、平均温度より低い温度の測点に対応するクラムを検出する。 In the above invention, preferably, for the crumb-shaped polymer supplied continuously, the temperature at each measurement point is measured, the average temperature of a plurality of measurement points is obtained, and the crumb corresponding to the measurement point having a temperature lower than the average temperature is obtained. Is detected.
　上記発明において好ましくは、前記平均温度との温度差が９．５℃以上の測点に対応するクラムを検出する。 In the above invention, preferably, a crumb corresponding to a measurement point having a temperature difference from the average temperature of 9.5 ° C. or more is detected.
　これにより、過剰水分の気化影響、あるいは温度上昇しにくい影響による低温部を検出できる。 This makes it possible to detect a low-temperature portion due to the vaporization effect of excess moisture or the effect of the temperature not rising easily.
　上記発明において好ましくは、前記脱水乾燥したクラム状のポリマーが供給されるときのポリマーの平均温度は４０～７０℃である。 In the above invention, preferably, the average temperature of the polymer when the dehydrated and dried crumb-like polymer is supplied is 40 to 70 ° C.
　これにより、過剰水分による上記影響が顕在化しやすくなる。 This makes it easier for the above effects due to excess moisture to become apparent.
　上記発明において好ましくは、前記過剰水分を含むクラムは塊状である。 に お い て In the above invention, preferably, the crumb containing excess moisture is in a lump.
　過剰水分を含むクラムは塊になりやすい。また、塊状であると気化、あるいは温度上昇しにくい影響を検出しやすい。 ク Crumbs with excess moisture tend to clump. In addition, when it is a lump, it is easy to detect the effect of being difficult to evaporate or raise the temperature.
　上記発明において好ましくは、過剰水分を含むクラムは、含水率が１質量％以上である。 に お い て In the above invention, preferably, the crumb containing excess moisture has a moisture content of 1% by mass or more.
　上記課題を解決する本発明は、重合し脱水乾燥したクラム状のポリマーを連続的に供給する供給手段と、前記供給手段より供給されたクラム状のポリマーの温度を測定する温度測定手段と、前記温度測定手段を用いて平均温度との温度差を算出し、温度差に基づいて過剰水分を含むクラムを検出する判断手段と、を備える検査装置である。 The present invention for solving the above-mentioned problems is a supply means for continuously supplying a polymerized, dehydrated and dried crumb-shaped polymer, a temperature measuring means for measuring the temperature of the crumb-shaped polymer supplied from the supply means, A determination means for calculating a temperature difference from the average temperature using the temperature measurement means and detecting a crumb containing excess moisture based on the temperature difference.
　上記発明において好ましくは、前記過剰水分検査手段は、サーモグラフカメラである。 に お い て In the above invention, preferably, the excess moisture inspection means is a thermographic camera.
　本発明は、脱水／乾燥工程の後、成型前に過剰水分を検出できる。 The present invention can detect excess moisture after the dehydration / drying step and before molding.
本発明の一実施形態に係るシステム構成図である。FIG. 1 is a system configuration diagram according to an embodiment of the present invention. 本発明の基本概念の根拠となる検証試験結果である。4 is a verification test result that is a basis for the basic concept of the present invention. 本発明の一実施形態に係る検出例である。It is a detection example concerning one embodiment of the present invention.
　～システム構成～ ～ System configuration ～
　図１は、本発明の一実施形態に係るシステム構成図である。 FIG. 1 is a system configuration diagram according to an embodiment of the present invention.
　システムは、連続供給手段と、過剰水分検査手段と、ベール相当重量計測手段と、ベール成型手段と、搬出手段と、制御手段とを備え、一連の動作をおこなう。 The system includes a continuous supply unit, an excess moisture inspection unit, a bale-equivalent weight measuring unit, a bale forming unit, a carrying-out unit, and a control unit, and performs a series of operations.
　連続供給手段は、例えば、振動フィーダ１である。振動フィーダ１は、重合後、脱水／乾燥工程８を経たクラム状のポリマー２を連続的にシステムに供給する。 The continuous supply means is, for example, the vibration feeder 1. After the polymerization, the vibration feeder 1 continuously supplies the crumb-shaped polymer 2 that has undergone the dehydration / drying step 8 to the system.
　過剰水分検査手段は、例えば、サーモグラフカメラ３である。サーモグラフカメラ３は、振動フィーダ１上に設けられ、乾燥不十分なクラムによる温度未上昇を検知することにより、過剰水分を検出する（詳細後述）。 The excess moisture inspection means is, for example, a thermographic camera 3. The thermographic camera 3 is provided on the vibrating feeder 1 and detects excess moisture by detecting temperature rise due to insufficiently dried crumbs (described later in detail).
　ベール相当重量計測手段は、例えば、ホッパーを有する計量装置６である。ホッパーは連続供給手段とベール成型手段との間に設けられる。ホッパーは上ホッパーと下ホッパーを有する。上ホッパーと下ホッパーの動作が制御され、計量装置６によりホッパー内に蓄積されたクラム状のポリマーの重量を計量することで、ベール相当のクラム状のポリマーの重量を計測する。 The veil-equivalent weight measuring means is, for example, a weighing device 6 having a hopper. The hopper is provided between the continuous feeding means and the bale forming means. The hopper has an upper hopper and a lower hopper. The operations of the upper hopper and the lower hopper are controlled, and the weight of the crumb-like polymer accumulated in the hopper by the weighing device 6 is measured to measure the weight of the crumb-like polymer equivalent to the veil.
　ベール成型手段は、例えば、加圧成型機（ベーラー）７である。ベール相当重量計測手段により計量された分のクラム状のポリマーが供給され、加圧成型され、ベールとなる。 The bale forming means is, for example, a pressure forming machine (baler) 7. The crumb-shaped polymer measured by the bale-equivalent weight measuring means is supplied and pressed to form a veil.
　搬出手段は、例えば、コンベア１４である。コンベア１４の途中には重量計測装置１５が設けられている。 The unloading means is, for example, the conveyor 14. A weight measuring device 15 is provided in the middle of the conveyor 14.
　制御装置３０は、過剰水分検査手段３から過剰水分検査情報を、重量計測装置１５からベール重量情報を入力し、仕分け制御をおこなう。すなわち、過剰水分が検出されず、正規範囲の重量のベールを正規品１２として次工程（包装工程）９へ搬出し、過剰水分が検出されたか、または／および、正規範囲外の重量のベールを規格外品１３として取り除き、別工程１０（再処理）へ送る。 (4) The control device 30 inputs the excess moisture inspection information from the excess moisture inspection means 3 and the bale weight information from the weight measuring device 15 and performs sorting control. In other words, no excess moisture is detected, and a bale having a weight in a normal range is carried out to the next step (packing step) 9 as a regular product 12, and a veil in which excess moisture is detected and / or a weight outside the normal range is removed. It is removed as a nonstandard product 13 and sent to another process 10 (reprocessing).
　過剰水分は、実質的な瑕疵で無く、過剰水分を含むクラム状のポリマーを再処理することで、材料として再利用できる。 Excess moisture is not a substantial defect and can be reused as a material by reprocessing a crumb-like polymer containing excess moisture.
　～本願基本概念～
　本願発明は、過剰水分による温度差に着目したものである。図２は、本発明の基本概念の根拠となる検証試験結果である。図２の縦軸は、クラムの含水率（質量％）であり、横軸は、［（ＷＰ表面温度）－（クラムの平均温度）］から求めた数値である。ここで、ＷＰ表面温度とは、クラムにおいて過剰水分を含んでいると想定した部分の測定温度であり、クラム平均温度とは複数の測点の平均温度である。 ～ Basic concept of the present application ～
The present invention focuses on the temperature difference due to excess moisture. FIG. 2 shows verification test results that are the basis of the basic concept of the present invention. The vertical axis in FIG. 2 is the moisture content (mass%) of crumb, and the horizontal axis is a numerical value obtained from [(WP surface temperature) − (average crumb temperature)]. Here, the WP surface temperature is a measured temperature of a portion of the crumb that is assumed to contain excess moisture, and the crumb average temperature is an average temperature of a plurality of measurement points.
　重合後、脱水／乾燥工程を経て成型工程に連続的に供給されるクラム状のポリマーの平均温度は４０～７０℃である。さらに詳しくみると、冬季に行なった検証試験では、クラム状のポリマーの平均温度は４８．８℃であったのに対し、夏季に行なった検証試験では、クラム状のポリマーの平均温度は６０．７℃であった。 ク After the polymerization, the average temperature of the crumb-like polymer continuously supplied to the molding step via the dehydration / drying step is 40 to 70 ° C. More specifically, in a verification test performed in winter, the average temperature of the crumb-shaped polymer was 48.8 ° C., whereas in a verification test performed in summer, the average temperature of the crumb-shaped polymer was 60.80 ° C. 7 ° C.
　なお、検証試験場所での冬季の平均外気温は６℃前後であり、夏季の平均外気温は２６℃程度である。脱水／乾燥工程後のクラム状のポリマーの平均温度は外気温の影響を受ける。 The average outside temperature in winter at the verification test site is around 6 ° C, and the average outside temperature in summer is around 26 ° C. The average temperature of the crumb-like polymer after the dehydration / drying step is affected by the ambient temperature.
　夏季および冬季とも、クラム状のポリマーの温度は、平均値を中心に－２０℃～＋１５℃にバラついた。このときのクラム状のポリマーの含水率を調べた。 と も In both summer and winter, the temperature of the crumb-like polymer varied from −20 ° C. to + 15 ° C. around the average value. At this time, the water content of the crumb-like polymer was examined.
　図２の結果より、以下のことが分かる。ＷＰ表面温度がクラム平均温度付近やクラム平均温度より高温のクラムでは、極めて低い含水率であった。一方、ＷＰ表面温度が平均温度より低温のクラムでは、高い含水率であった。特に、ＷＰ表面温度とクラム平均温度との温度差が９．５℃以上の場合、クラムの含水率は非常に高かった。 以下 The following can be seen from the results of FIG. The crumb whose WP surface temperature was near the crumb average temperature or higher than the crumb average temperature had an extremely low moisture content. On the other hand, a crumb whose WP surface temperature was lower than the average temperature had a high water content. In particular, when the temperature difference between the WP surface temperature and the crumb average temperature was 9.5 ° C. or more, the water content of the crumb was very high.
　また、過剰水分を含むクラムは塊になりやすい傾向がみられた。当該塊において過剰水分を含む部分をWET POINT（WP）と定義した。脱水／乾燥工程後のクラムは比較的高温であるのに対し、過剰水分を含むクラムでは、水分が気化する際クラムの熱を奪うもの、あるいは、過剰水分が加わる分、温度が上昇されにくくなるものと推測される。 ク Also, crumbs containing excess water tended to form lumps. The portion of the mass containing excess moisture was defined as WET POINT (WP). While the crumb after the dehydration / drying step is relatively hot, crumbs containing excess moisture take away the heat of the crumb when the moisture evaporates, or the temperature is less likely to rise due to the addition of excess moisture. It is supposed to be.
　夏季および冬季とも同様な傾向がみられた。試験の一例では、冬季は、クラム表面温度４８．８℃、WP３５．４℃（クラム表面温度とＷＰの温度差１３．４℃）であり、夏季は、クラム表面温度６０．７℃、WP４７．４℃（クラム表面温度とＷＰの温度差１３．３℃）であった。 同 様 A similar trend was observed in the summer and winter. In an example of the test, the crumb surface temperature is 48.8 ° C and the WP is 35.4 ° C (the temperature difference between the crumb surface temperature and the WP is 13.4 ° C) in winter, and the crumb surface temperature is 60.7 ° C and WP47. 4 ° C. (13.3 ° C. between the crumb surface temperature and the WP).
　この結果から、クラム状のポリマーの温度を測定して、過剰水分を含むクラムを検出でき、特に、温度差に着目することにより、外気温度に依存せず、確実にWET POINTを検出可能であると判断した。特に、過剰水分を１質量％以上含むクラムのWET POINTを検出することが出来る。 From this result, it is possible to detect the crumb containing excess moisture by measuring the temperature of the crumb-shaped polymer.In particular, by focusing on the temperature difference, it is possible to reliably detect WET POINT regardless of the outside air temperature Was determined. In particular, it is possible to detect wet crumbs containing 1% by mass or more of excess moisture.
　～過剰水分を含むクラム（WET POINT）の検出～
　WET POINTは、温度差に基づいて検出される。より具体的には、クラムの複数の測点の平均温度を求め、平均温度より低い温度の測点部分をWET POINTとして設定することで、WET POINTを検出することができる。 ～ Detection of crumb (WET POINT) containing excess water ～
WET POINT is detected based on the temperature difference. More specifically, a WET POINT can be detected by determining an average temperature of a plurality of measurement points of the crumb and setting a measurement point having a temperature lower than the average temperature as a WET POINT.
　前記平均温度との差が９．５℃以上の測点部分をWET POINTと設定することで、より高精度にWET POINTを検出することができる。 W By setting a measurement point portion having a difference from the average temperature of 9.5 ° C. or more as WET POINT, WET POINT can be detected with higher accuracy.
　クラムの平均温度は、例えば、以下の方法により求めることができる。 The average temperature of a pea crumb can be determined, for example, by the following method.
　図３は、温度測定の一例である。温度測定手段はサーモグラフカメラである。３０フレーム／秒の撮像が可能である。サーモグラフカメラ３は、例えば、チノー社製CPA-L25Bを用いることができる。 Fig. 3 shows an example of temperature measurement. The temperature measuring means is a thermographic camera. Imaging at 30 frames / sec is possible. As the thermographic camera 3, for example, CPA-L25B manufactured by Chino can be used.
　サーモグラフカメラでクラムを撮影・画像化し、各画像において所定範囲（たとえば、６００ｍｍ×５００ｍｍ）に対応する画像範囲（図示点線）の画素単位の温度を測定する。各画素の測定温度からクラムの平均温度を求めることができる。 (4) The crumb is photographed and imaged by a thermographic camera, and the temperature of each image in each image is measured in a pixel range (dotted line in the drawing) corresponding to a predetermined range (eg, 600 mm × 500 mm). The average temperature of the crumb can be obtained from the measured temperature of each pixel.
　平均温度を求める際は、測点は１００～１００，０００が好ましく、１，０００～１００，０００がより好ましく、１０，０００～１００，０００が特に好ましい。高精度にWET POINTを検出することができる。 (4) When determining the average temperature, the measuring point is preferably 100 to 100,000, more preferably 1,000 to 100,000, and particularly preferably 10,000 to 100,000. WET POINT can be detected with high accuracy.
　さらに、平均温度より所定値以下（例えば９．５℃）の低温の画素を抽出することで、WET POINTを検出する。 (4) Further, WET @ POINT is detected by extracting a low-temperature pixel having a temperature lower than a predetermined value (for example, 9.5 ° C.) from the average temperature.
　～過剰水分発生メカニズム推定～
　脱水／乾燥工程を経ることにより、過剰水分を有するクラムは発生しないのが前提である。にもかかわらず、実際には、過剰水分を有するクラムが発生する。そのメカニズムについて考察した。 -Estimation of excess moisture generation mechanism-
It is premised that crumbs having excessive moisture do not occur through the dehydration / drying step. Nevertheless, in practice crumbs with excess moisture are generated. The mechanism was discussed.
　脱水／乾燥工程において、水分を外部に排出している。その際、小片が排出部内壁面にこびり付く。小片は、外部に排出される水分の一部を吸収する。 水分 Water is discharged to the outside in the dehydration / drying process. At that time, the small pieces stick to the inner wall surface of the discharge unit. The small pieces absorb a part of the water discharged to the outside.
　水分を含んだ小片が何かしらの切っ掛けにより剥離し、次工程（成型工程）に供給されるクラムに混入するおそれがある。 Small pieces containing water may be peeled off by some kind of cutting, and mixed into crumbs supplied to the next step (molding step).
　したがって、過剰水分を有するクラム発生を予測することは非常に困難である。 Therefore, it is very difficult to predict the occurrence of crumbs with excess moisture.
　～クラム塊について～
　クラムの特徴として、クラムに粘着性があり、互いにくっつきやすく、クラム塊になりやすいと推測される。過剰水分を含むクラム塊が混入することにより、WET POINTが発生するものと推測される。 ～ About crumb lump ～
As a characteristic of the crumb, it is presumed that the crumb is sticky, easily adheres to each other, and easily forms a crumb mass. It is presumed that WET POINT is generated due to the inclusion of crumb lumps containing excess moisture.
　一方、過剰水分がまとまって存在すると、気化の影響等が顕在化しやすく、低温部を検出しやすい（図３参照）。 On the other hand, if excessive moisture is present in a lump, the effects of vaporization and the like are likely to become apparent, and low-temperature parts are easily detected (see FIG. 3).
　したがって、本願はWET POINTの検出に好適であるが、クラム塊に限定されず、クラムにも適用可能である。 Thus, although the present application is suitable for detecting WET POINT, the present invention is not limited to crumb lumps but can be applied to crumbs.
　なお、一般的なクラム粒径は３～１０ｍｍである。本願では、粒径２０ｍｍ以上をクラム塊と呼ぶ。 The general crumb particle size is 3 to 10 mm. In the present application, a particle size of 20 mm or more is called a crumb lump.
　～効果～
　上記により、脱水／乾燥工程の後、ベール成型前に過剰水分を検出できる。その結果、ベール内部の過剰水分も検出できる。 ~ Effect ~
As described above, the excess moisture can be detected after the dehydration / drying step and before bale molding. As a result, excess moisture inside the bale can also be detected.
　なお、ベール成型前に過剰水分を検出できるため、たとえば、ベーラーへの落下軌道において、過剰水分を含むクラム状のポリマーを取り除ける可能性もある。 た め Because excess moisture can be detected before bale molding, for example, there is a possibility that a crumb-like polymer containing excess moisture can be removed on a falling trajectory to a baler.
　ところで、クラム状のポリマーは粘着性を有し、粒同士がお互いくっつきやすい結果、粒度不均一となり挙動が予測しにくい。ベーラーへの落下軌道において、過剰水分を含むクラム状のポリマーを取り除く場合、複雑な機構が必要となる。一方で、ベール成型後、過剰水分を含むベールを除去すれば、容易に確実に除去できる。 By the way, the crumb-shaped polymer has tackiness, and the particles tend to stick to each other. As a result, the particle size becomes uneven and the behavior is hard to predict. A complicated mechanism is required to remove the crumb-like polymer containing excess moisture in the falling trajectory to the baler. On the other hand, if the veil containing excess moisture is removed after bale molding, it can be easily and reliably removed.
　上記では、サーモグラフカメラと簡単な制御以外の構成や工程は不要である。既存の製造プロセスに新たな構成や新たな工程を追加することなく、簡易に確実に過剰水分を検出できる。製品の品質に影響を与えることもない。 In the above, no configuration or process other than the thermographic camera and simple control is required. Excess moisture can be easily and reliably detected without adding a new configuration or a new process to an existing manufacturing process. It does not affect product quality.
　また、温度差に着目することにより、外気温度に依存せず、確実に検出可能である。 Furthermore, by focusing on the temperature difference, it is possible to reliably detect the temperature difference without depending on the outside air temperature.
～対象のクラム状のポリマー～
　ベールにされる対象のクラム状のポリマーとしては、加硫可能なゴムであって、例えば天然ゴム（NR）、イソプレンゴム（IR）、スチレンブタジエンゴム（SBR）、ブタジエンゴム（BR）、クロロプレンゴム（CR）、ブチルゴム（IIR）、ニトリルゴム（NBR）、エチレン・プロピレンゴム（EPM、EPDM）、クロロスルホン化ポリエチレンゴム（CSM）、アクリルゴム（ACM）、ウレタンゴム（U）、シリコーンゴム（VMQ、PVMQ、FVMQ）、フッ素ゴム（FKM）、多硫化ゴム（T）等が挙げられる。特に、本発明に関しては、ブタジエンゴム（BR）への適用が最適である。検証試験ではブタジエンゴムを用いた。 ~ Clam-like polymer of interest ~
The crumb-like polymer to be veiled is a vulcanizable rubber such as natural rubber (NR), isoprene rubber (IR), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), butyl rubber (IIR), nitrile rubber (NBR), ethylene / propylene rubber (EPM, EPDM), chlorosulfonated polyethylene rubber (CSM), acrylic rubber (ACM), urethane rubber (U), silicone rubber (VMQ) , PVMQ, FVMQ), fluoro rubber (FKM), polysulfide rubber (T) and the like. In particular, the present invention is most suitably applied to butadiene rubber (BR). In the verification test, butadiene rubber was used.
～まとめ～
　脱水／乾燥工程を経て成型工程に連続的に供給されるクラム状のポリマーの平均温度は４０～７０℃である。たとえば、冬季に行なった検証試験では、平均温度４８．８℃であったのに対し、夏季に行なった検証試験では、平均温度６０．７℃であった。このときのクラム状のポリマーの含水率を調べた。平均値付近や平均より高温のクラムでは、極めて低い含水率である。一方、平均より低温のクラム、特に、平均温度との温度差が９．５℃以上の場合、顕著に高い含水率であった。一例として過剰水分を含むクラムは塊の温度を測定すると、冬季３５．４℃（温度差１３．４℃）、夏季４７．４℃（温度差１３．３℃）であった。この結果から、クラム状のポリマーの温度を測定して、温度差に着目することにより、外気温に依存せず、確実に過剰水分を含むクラムを検出可能である。 ~ Summary ~
The average temperature of the crumb-like polymer continuously supplied to the molding step via the dehydration / drying step is 40 to 70 ° C. For example, in a verification test performed in winter, the average temperature was 48.8 ° C., whereas in a verification test performed in summer, the average temperature was 60.7 ° C. At this time, the water content of the crumb-like polymer was examined. Crumbs near or above average have very low moisture content. On the other hand, when the temperature of the crumb was lower than the average, especially when the temperature difference from the average temperature was 9.5 ° C. or more, the water content was remarkably high. As an example, the temperature of the mass of the crumb containing excess moisture was 35.4 ° C. in winter (temperature difference 13.4 ° C.) and 47.4 ° C. in summer (temperature difference 13.3 ° C.). From this result, by measuring the temperature of the crumb-shaped polymer and paying attention to the temperature difference, it is possible to reliably detect the crumb containing excess moisture without depending on the outside air temperature.
　　１　振動フィーダ
　　２　ゴムクラム
　　３　サーモグラフカメラ
　　６　ホッパー付計量装置
　　７　ベーラー（加圧成型機）
　　８　脱水／乾燥工程
　　９　包装工程
　１０　再処理工程
　１１　異常検知信号
　１２　正規品（製品）
　１３　規格外品
　１４　コンベア
　１５　重量計測装置
　３０　制御装置 DESCRIPTION OF SYMBOLS 1 Vibration feeder 2 Rubber crumb 3 Thermograph camera 6 Measuring device with hopper 7 Baler (Pressure molding machine)
8 Dehydration / drying process 9 Packaging process 10 Reprocessing process 11 Abnormality detection signal 12 Regular product (product)
13 Nonstandard product 14 Conveyor 15 Weight measuring device 30 Control device

Claims (9)

  1. 　重合し脱水乾燥したクラム状のポリマーを連続的に供給し、
    　前記クラム状のポリマー内の過剰水分を含むクラムを検出する
    　ことを特徴とする検査方法。     Continuous supply of crumb-like polymer that has been polymerized and dehydrated and dried,
    An inspection method, wherein a crumb containing excess moisture in the crumb-like polymer is detected.
  2. 　前記クラム状のポリマーの温度を測定し、
    　温度差に基づいて過剰水分を含むクラムを検出する
    　ことを特徴とする請求項１記載の検査方法。     Measuring the temperature of the crumb-like polymer,
    The inspection method according to claim 1, wherein a crumb containing excess moisture is detected based on the temperature difference.
  3. 　連続的に供給されるクラム状のポリマーに対し、測点ごとの温度を測定し、
    　複数の測点の平均温度を求め、
    　平均温度より低い温度の測点に対応するクラムを検出する
    　ことを特徴とする請求項２記載の検査方法。     For crumb-like polymer supplied continuously, measure the temperature at each measurement point,
    Find the average temperature of multiple measurement points,
    The inspection method according to claim 2, wherein a crumb corresponding to a measurement point at a temperature lower than the average temperature is detected.
  4. 　前記平均温度との温度差が９．５℃以上の測点に対応するクラムを検出する
    　ことを特徴とする請求項３記載の検査方法。     The inspection method according to claim 3, wherein a crumb corresponding to a measurement point having a temperature difference from the average temperature of 9.5 ° C or more is detected.
  5. 　前記脱水乾燥したクラム状のポリマーが供給されるときのポリマーの平均温度は４０～７０℃である
    　ことを特徴とする請求項１～４いずれか記載の検査方法。     The inspection method according to any one of claims 1 to 4, wherein an average temperature of the dehydrated and dried crumb-shaped polymer is 40 to 70 ° C.
  6. 　前記過剰水分を含むクラムは塊状である
    　ことを特徴とする請求項１～５いずれか記載の検査方法。     The inspection method according to any one of claims 1 to 5, wherein the crumb containing excess moisture is a lump.
  7. 　過剰水分を含むクラムは、含水率が１質量％以上である
    ことを特徴とする請求項１～６いずれか記載の検査方法。     The inspection method according to any one of claims 1 to 6, wherein the crumb containing excess moisture has a moisture content of 1% by mass or more.
  8. 　重合し脱水乾燥したクラム状のポリマーを連続的に供給する供給手段と、
    　前記供給手段より供給されたクラム状のポリマーの温度を測定する温度測定手段と、
    　前記温度測定手段を用いて平均温度との温度差を算出し、温度差に基づいて過剰水分を含むクラムを検出する判断手段と、
    　を備えることを特徴とする検査装置。     Supply means for continuously supplying a polymerized and dehydrated and dried crumb-like polymer,
    Temperature measuring means for measuring the temperature of the crumb-like polymer supplied from the supplying means,
    Calculating the temperature difference from the average temperature using the temperature measuring means, determining means for detecting a crumb containing excess moisture based on the temperature difference,
    An inspection apparatus comprising:
  9. 　前記温度測定手段はサーモグラフカメラである
    　ことを特徴とする請求項８記載の検査装置。     The inspection device according to claim 8, wherein the temperature measuring means is a thermographic camera.
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