JP4851195B2 - Method for controlling the coating thickness of extruded coated cables - Google Patents

Method for controlling the coating thickness of extruded coated cables Download PDF

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JP4851195B2
JP4851195B2 JP2006034152A JP2006034152A JP4851195B2 JP 4851195 B2 JP4851195 B2 JP 4851195B2 JP 2006034152 A JP2006034152 A JP 2006034152A JP 2006034152 A JP2006034152 A JP 2006034152A JP 4851195 B2 JP4851195 B2 JP 4851195B2
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outer diameter
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coating thickness
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coating
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泰治 内山
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THE FURUKAW ELECTRIC CO., LTD.
Furukawa Automotive Systems Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92123—Diameter or circumference
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92438—Conveying, transporting or storage of articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92885—Screw or gear

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)

Description

本発明は、ケーブルコアに樹脂を押出被覆して押出被覆ケーブルを製造するラインでの被覆厚制御方法に関するものである。   The present invention relates to a coating thickness control method in a line for manufacturing an extrusion-coated cable by extrusion-coating a resin on a cable core.

押出被覆ケーブルの製造ラインでは通常、押出被覆ケーブルの外径制御が行われている。例えば特許文献１に開示されている押出被覆ケーブルの外径制御方法は、押出機の出口側に設置された補助冷却槽と本冷却槽の間で押出被覆ケーブルの外径を測定し、その測定値が予め設定された目標外径に近づくように押出被覆ケーブルの引取速度を制御する、というものである。   In the extrusion coated cable production line, the outer diameter of the extruded coated cable is usually controlled. For example, the outer diameter control method of the extrusion-coated cable disclosed in Patent Document 1 measures the outer diameter of the extrusion-coated cable between the auxiliary cooling tank installed on the outlet side of the extruder and the main cooling tank, and the measurement The take-up speed of the extruded coated cable is controlled so that the value approaches a preset target outer diameter.

特開平９−１０２２２９号公報JP-A-9-102229

しかし、押出被覆ケーブルの外径を制御する方法では、押出被覆を施す前のケーブルコアに外径変動があると、被覆の厚さが変動してしまうので、最低被覆厚を確保できない被覆厚不良が発生しやすい。例えば、撚線コアの外周に遮蔽テープを巻いて（又は編組を施して）ケーブルコアとし、このケーブルコアに押出被覆を施して遮蔽ケーブルを製造する場合には、ケーブルコアの外径変動が大きいため、被覆厚の変動も大きくなり、被覆厚不良が発生しやすくなる。ケーブルコアの外径変動があっても、被覆厚不良を出さないようにするためには、被覆外径を大きめに設定すればよいが、そうすると被覆目付が多くなり、コスト高になる。   However, in the method of controlling the outer diameter of the extrusion-coated cable, if the cable core before the extrusion coating has a variation in outer diameter, the coating thickness will fluctuate, so the minimum coating thickness cannot be secured. Is likely to occur. For example, when a shielded tape is wound around the outer periphery of a stranded wire core (or braided) to form a cable core, and the cable core is subjected to extrusion coating to produce a shielded cable, the outer diameter variation of the cable core is large. For this reason, the variation in the coating thickness also increases, and a coating thickness defect is likely to occur. Even if there is a change in the outer diameter of the cable core, in order to prevent a defective coating thickness from occurring, it is only necessary to set the outer diameter of the coating to be larger, but this increases the basis weight of the coating and increases the cost.

本発明の目的は、ケーブルコアに外径変動があっても被覆厚の変動を小さく抑えることができる押出被覆ケーブルの被覆厚制御方法を提供することにある。   An object of the present invention is to provide a method for controlling the coating thickness of an extrusion-coated cable that can suppress the variation in the coating thickness even if the cable core has a variation in the outer diameter.

上記目的を達成するため本発明は、ケーブルコアに樹脂を押出被覆する押出機と、押し出された被覆を冷却する冷却槽とを備えた押出被覆ケーブル製造ラインでの被覆厚制御方法において、
押出機に入る前のケーブルコアの外径測定する被覆前外径測定器と、押出機を出て冷却槽を通過した後の押出被覆ケーブルの外径を測定する冷却後外径測定器とを設置し、
走行するケーブルコアの同じ箇所での冷却後外径測定器の測定値Ｄ２から被覆前外径測定器の測定値Ｄ１を減算して被覆厚Ｔ１を求め、その被覆厚Ｔ１が目標被覆厚Ｔに近づくように押出機のスクリュー回転数を制御することを特徴とするものである。 In order to achieve the above object, the present invention provides a coating thickness control method in an extrusion-coated cable production line comprising an extruder for extrusion-coating a resin on a cable core and a cooling tank for cooling the extruded coating.
A pre-coating outer diameter measuring device for measuring the outer diameter of the cable core before entering the extruder, and a post-cooling outer diameter measuring device for measuring the outer diameter of the extruded coated cable after leaving the extruder and passing through the cooling tank. Install
The coating thickness T1 is obtained by subtracting the measured value D1 of the pre-coating outer diameter measuring device from the measured value D2 of the outer diameter measuring device after cooling at the same location of the traveling cable core, and the coating thickness T1 becomes the target coating thickness T. The screw speed of the extruder is controlled so as to approach.

本発明の被覆厚制御方法においては、前記被覆厚Ｔ１が、目標被覆厚Ｔより大きい場合は目標被覆厚Ｔに近づくようにスクリュー回転数を低下させ、目標被覆厚Ｔと同じ場合はスクリュー回転数をそのまま維持し、目標被覆厚Ｔより小さい場合は目標被覆厚Ｔに近づくようにスクリュー回転数を上昇させる制御を行うことが好ましい。   In the coating thickness control method of the present invention, when the coating thickness T1 is larger than the target coating thickness T, the screw rotational speed is decreased so as to approach the target coating thickness T. Is maintained as it is, and when it is smaller than the target coating thickness T, it is preferable to perform control to increase the screw rotation speed so as to approach the target coating thickness T.

本発明の被覆厚制御方法においては、押出機を出て冷却槽に入る前の押出被覆ケーブルの外径を測定する冷却前外径測定器をさらに設置し、
走行するケーブルの同じ箇所での冷却前外径測定器の測定値Ｄ３から冷却後外径測定器の測定値Ｄ２を減算して冷却による被覆の収縮厚Ｓ１を求め、その値から平均収縮厚Ave.Ｓ１を算出し、さらに、（被覆前外径測定器の測定値Ｄ１＋目標被覆厚Ｔ＋平均収縮厚Ave.Ｓ１）を演算して冷却前目標外径Ｄを求め、
冷却前外径測定器の測定値Ｄ３が、冷却前目標外径Ｄより大きい場合は冷却前目標外径Ｄに近づくようにスクリュー回転数を低下させ、冷却前目標外径Ｄと同じ場合はスクリュー回転数をそのまま維持し、冷却前目標外径Ｄより小さい場合は冷却前目標外径Ｄに近づくようにスクリュー回転数を上昇させる補正制御を行うことがさらに好ましい。 In the coating thickness control method of the present invention, further installed a pre-cooling outer diameter measuring device for measuring the outer diameter of the extruded coated cable before exiting the extruder and entering the cooling tank,
By subtracting the measured value D2 of the outer diameter measuring device after cooling from the measured value D3 of the outer diameter measuring device before cooling at the same location of the traveling cable, the shrinkage thickness S1 of the coating by cooling is obtained, and the average shrinkage thickness Ave is obtained from that value. .S1 is calculated, and (target value D1 before coating outer diameter measuring device + target coating thickness T + average shrinkage thickness Ave.S1) is calculated to obtain a target outer diameter D before cooling,
When the measured value D3 of the pre-cooling outer diameter measuring device is larger than the pre-cooling target outer diameter D, the screw rotational speed is decreased so as to approach the pre-cooling target outer diameter D. It is more preferable to perform correction control to increase the screw rotation speed so as to approach the target outer diameter D before cooling when the rotation speed is maintained as it is and smaller than the target outer diameter D before cooling.

本発明によれば、ケーブルコアの外径が変動しても、被覆厚が一定になるように制御を行うので、被覆厚の変動が少なくなり、被覆厚不良が少なくなって、製品歩留まりを向上させることができる。その結果、安定して安価な押出被覆ケーブルを製造することができる。   According to the present invention, even if the outer diameter of the cable core fluctuates, control is performed so that the coating thickness is constant, so that the variation in the coating thickness is reduced, the coating thickness defect is reduced, and the product yield is improved. Can be made. As a result, an inexpensive extrusion-coated cable can be manufactured stably.

図１は本発明の一実施形態を示す。この実施形態では、コア撚線１１に金属テープフォーミング装置１で遮蔽用金属テープを縦添え被覆してケーブルコア１２とし、このケーブルコア１２を押出機３に通して樹脂を押出被覆し、さらに冷却槽５に通して冷却した後、引取機７で引き取って押出被覆ケーブル１３を製造する。   FIG. 1 shows an embodiment of the present invention. In this embodiment, a core metal wire 11 is covered with a metal tape for shielding by a metal tape forming apparatus 1 to form a cable core 12, and the cable core 12 is passed through an extruder 3 to extrude resin and further cooled. After cooling through the tank 5, it is taken up by the take-up machine 7 to produce the extrusion-coated cable 13.

押出機３の手前にはケーブルコア１２の外径を測定する被覆前外径測定器２を設置し、押出機３と冷却槽５の間には冷却前の押出被覆ケーブル１３の外径を測定する冷却前外径測定器４を設置し、さらに、冷却槽５と引取機７の間には冷却後の押出被覆ケーブル１３の外径を測定する冷却後外径測定器６を設置する。   An uncoated outer diameter measuring device 2 for measuring the outer diameter of the cable core 12 is installed in front of the extruder 3, and the outer diameter of the extruded coated cable 13 before cooling is measured between the extruder 3 and the cooling bath 5. A pre-cooling outer diameter measuring instrument 4 is installed, and a post-cooling outer diameter measuring instrument 6 for measuring the outer diameter of the extruded coated cable 13 after cooling is installed between the cooling tank 5 and the take-up machine 7.

被覆前外径測定器２の測定値Ｄ１と冷却後外径測定器６の測定値Ｄ２は主制御部２１に入力される。主制御部２１では、入力された測定値Ｄ２から測定値Ｄ１を減算して被覆厚Ｔ１を求める。なお主制御部２１で被覆厚Ｔ１を演算するときは、製造ラインを走行するケーブルコアの同じ箇所での測定値Ｄ１、Ｄ２を使用する必要がある。そのためには例えば、被覆前外径測定器２の測定値Ｄ１を主制御部２１へ出力するタイミングを、ケーブルコア１２が被覆前外径測定器２から冷却後外径測定器６に達するまでの時間だけ遅らせればよい。あるいは、被覆前外径測定器２からは測定値Ｄ１をそのまま出力し、主制御部２１で被覆厚Ｔ１を演算するときに、ケーブルコア１２が被覆前外径測定器２から冷却後外径測定器６に達するまでの時間だけ遅らせた測定値Ｄ１を使用してもよい。   The measured value D1 of the outer diameter measuring instrument 2 before coating and the measured value D2 of the outer diameter measuring instrument 6 after cooling are input to the main control unit 21. The main control unit 21 subtracts the measurement value D1 from the input measurement value D2 to obtain the coating thickness T1. When the main control unit 21 calculates the coating thickness T1, it is necessary to use the measured values D1 and D2 at the same location of the cable core traveling on the production line. For this purpose, for example, the timing at which the measured value D1 of the pre-coating outer diameter measuring device 2 is output to the main control unit 21 until the cable core 12 reaches the post-cooling outer diameter measuring device 6 from the pre-coating outer diameter measuring device 2. You only have to delay by time. Alternatively, the measured value D1 is output as it is from the outer diameter measuring instrument 2 before coating, and the outer diameter measurement after the cable core 12 is cooled from the outer diameter measuring instrument 2 before coating when the main control unit 21 calculates the coating thickness T1. The measured value D1 delayed by the time to reach the vessel 6 may be used.

次に、上記のようにして求めた被覆厚Ｔ１と、予め設定されている目標被覆厚Ｔとを比較し、被覆厚Ｔ１が目標被覆厚Ｔより大きい場合は、被覆厚Ｔ１が目標被覆厚Ｔに近づくように押出機３のスクリュー回転数を低下させる制御を行い、被覆厚Ｔ１が目標被覆厚Ｔと同じ場合はスクリュー回転数をそのまま維持し、被覆厚Ｔ１が目標被覆厚Ｔより小さい場合は、被覆厚Ｔ１が目標被覆厚Ｔに近づくようにスクリュー回転数を上昇させる制御を行う。   Next, the coating thickness T1 obtained as described above is compared with a preset target coating thickness T. When the coating thickness T1 is larger than the target coating thickness T, the coating thickness T1 is the target coating thickness T. When the coating thickness T1 is the same as the target coating thickness T, the screw rotation number is maintained as it is, and when the coating thickness T1 is smaller than the target coating thickness T Then, control is performed to increase the screw rotational speed so that the coating thickness T1 approaches the target coating thickness T.

このようにすれば、ケーブルコア１２の外径に変動があっても、それに応じて押出機の吐出量が制御されるため、被覆厚がほぼ一定の押出被覆ケーブルを製造することができる。   In this way, even if the outer diameter of the cable core 12 varies, the discharge amount of the extruder is controlled accordingly, so that an extruded coated cable with a substantially constant coating thickness can be manufactured.

なお、スクリュー回転数の低下率、上昇率は、予め設定されている押出機吐出量、引取速度、被覆目付から求めればよい。   In addition, what is necessary is just to obtain | require the fall rate of a screw rotation speed, and a raise rate from the extruder discharge amount, taking-up speed, and covering fabric weight which were preset.

以上の被覆厚制御方法は、被覆前外径測定器２の測定値Ｄ１と冷却後外径測定器６の測定値Ｄ２から押出機スクリューの回転数を制御するものであるが、より精度の高い被覆厚制御を行うためには、押出機３と冷却槽５の間に冷却前外径測定器４を設置すると共に、補助制御部２２を設けて、次のような補正制御を行うとよい。   The above coating thickness control method controls the number of revolutions of the extruder screw from the measured value D1 of the pre-coating outer diameter measuring device 2 and the measured value D2 of the outer diameter measuring device 6 after cooling, but with higher accuracy. In order to perform the coating thickness control, it is preferable to install the pre-cooling outer diameter measuring device 4 between the extruder 3 and the cooling tank 5 and provide the auxiliary control unit 22 to perform the following correction control.

すなわち、補助制御部２２には、被覆前外径測定器２の測定値Ｄ１と、冷却前外径測定器４の測定値Ｄ３と、冷却後外径測定器６の測定値Ｄ２が入力される。補助制御部２２ではまず、冷却前外径測定器４の測定値Ｄ３から冷却後外径測定器６の測定値Ｄ２を減算して冷却による被覆の収縮厚Ｓ１を求め、さらに、その値から平均収縮厚Ave.Ｓ１（Ｓ１の単位長又は単位時間当たりの平均値）を算出する。次いで、（被覆前外径測定器の測定値Ｄ１＋目標被覆厚Ｔ＋平均収縮厚Ave.Ｓ１）を演算して冷却前目標外径Ｄを求める。   That is, the auxiliary control unit 22 receives the measured value D1 of the pre-coating outer diameter measuring device 2, the measured value D3 of the pre-cooling outer diameter measuring device 4, and the measured value D2 of the outer diameter measuring device 6 after cooling. . First, the auxiliary control unit 22 subtracts the measured value D2 of the outer diameter measuring device 6 after cooling from the measured value D3 of the outer diameter measuring device 4 before cooling to obtain the shrinkage thickness S1 of the coating due to cooling. The shrinkage thickness Ave.S1 (the unit length of S1 or the average value per unit time) is calculated. Next, (the measured value D1 of the pre-coating outer diameter measuring device + the target coating thickness T + the average shrinkage thickness Ave.S1) is calculated to obtain the target outer diameter D before cooling.

なお、補助制御部２２で、収縮厚Ｓ１を求める場合も、製造ラインを走行するケーブルの同じ箇所での測定値Ｄ３、Ｄ２を使用するため、ケーブル１３が冷却前外径測定器４から冷却後外径測定器６に達するまでの時間を考慮する点は、主制御部２１の場合と同様である。また冷却前目標外径Ｄを算出する場合も、ケーブルコア１２が被覆前外径測定器２から冷却前外径測定器４に達するまでの時間を考慮する必要がある。   In addition, also when calculating | requiring shrinkage | contraction thickness S1 in the auxiliary | assistant control part 22, since the measured value D3 and D2 in the same location of the cable which drive | works a manufacturing line are used, the cable 13 is cooled from the outer diameter measuring device 4 before cooling. The point of considering the time to reach the outer diameter measuring device 6 is the same as in the case of the main control unit 21. Also, when calculating the pre-cooling target outer diameter D, it is necessary to consider the time until the cable core 12 reaches the pre-cooling outer diameter measuring device 4 from the pre-coating outer diameter measuring device 2.

次に、上記のようにして求めた冷却前目標外径Ｄと、冷却前外径測定器４の測定値Ｄ３とを比較し、測定値Ｄ３が冷却前目標外径Ｄより大きい場合は、測定値Ｄ３が冷却前目標外径Ｄに近づくように押出機３のスクリュー回転数を低下させる補正制御を行い、冷却前目標外径Ｄと同じ場合はスクリュー回転数をそのまま維持し、測定値Ｄ３が冷却前目標外径Ｄより小さい場合は冷却前目標外径Ｄに近づくようにスクリュー回転数を上昇させる補正制御を行う。   Next, the pre-cooling target outer diameter D obtained as described above is compared with the measurement value D3 of the pre-cooling outer diameter measuring device 4, and if the measurement value D3 is larger than the pre-cooling target outer diameter D, the measurement is performed. Correction control is performed to reduce the screw rotation speed of the extruder 3 so that the value D3 approaches the pre-cooling target outer diameter D. When the value is the same as the pre-cooling target outer diameter D, the screw rotation speed is maintained as it is. When it is smaller than the pre-cooling target outer diameter D, correction control is performed to increase the screw rotation speed so as to approach the pre-cooling target outer diameter D.

このようにすれば、押出直後の段階で、冷却後のケーブル外径を予測し、スクリュー回転数の補正をかけることで、より精度の高い被覆厚制御を行うことができる。   In this way, it is possible to perform more accurate coating thickness control by predicting the outer diameter of the cable after cooling and correcting the screw rotation speed immediately after extrusion.

なお、補正制御の場合も、スクリュー回転数の低下率、上昇率は、予め設定されている押出機吐出量、引取速度、被覆目付から求めればよい。   In the case of correction control as well, the reduction rate and increase rate of the screw rotation speed may be obtained from a preset extruder discharge amount, take-up speed, and covering weight.

本発明に係る押出被覆ケーブルの被覆厚制御方法の一実施形態を示すブロック図。The block diagram which shows one Embodiment of the coating thickness control method of the extrusion covering cable which concerns on this invention.

符号の説明Explanation of symbols

１：金属テープフォーミング装置
２：被覆前外径測定器
３：押出機
４：冷却前外径測定器
５：冷却槽
６：冷却後外径測定器
７：引取機
１１：コア撚線
１２：ケーブルコア
１３：押出被覆ケーブル
２１：主制御部
２２：補助制御部 1: Metal tape forming device 2: Outer diameter measuring device before coating 3: Extruder 4: Outer diameter measuring device before cooling 5: Cooling tank 6: Outer diameter measuring device after cooling 7: Take-up device 11: Core twisted wire 12: Cable Core 13: Extruded coated cable 21: Main controller 22: Auxiliary controller

Claims (3)

ケーブルコアに樹脂を押出被覆する押出機と、押し出された被覆を冷却する冷却槽とを備えた押出被覆ケーブル製造ラインでの被覆厚制御方法において、
押出機に入る前のケーブルコアの外径測定する被覆前外径測定器と、押出機を出て冷却槽を通過した後の押出被覆ケーブルの外径を測定する冷却後外径測定器とを設置し、
走行するケーブルコアの同じ箇所での冷却後外径測定器の測定値Ｄ２から被覆前外径測定器の測定値Ｄ１を減算して被覆厚Ｔ１を求め、その被覆厚Ｔ１が目標被覆厚Ｔに近づくように押出機のスクリュー回転数を制御することを特徴とする押出被覆ケーブルの被覆厚制御方法。 In a coating thickness control method in an extrusion-coated cable production line comprising an extruder for extrusion-coating a resin on a cable core and a cooling tank for cooling the extruded coating,
A pre-coating outer diameter measuring device for measuring the outer diameter of the cable core before entering the extruder, and a post-cooling outer diameter measuring device for measuring the outer diameter of the extruded coated cable after leaving the extruder and passing through the cooling tank. Install
The coating thickness T1 is obtained by subtracting the measured value D1 of the pre-coating outer diameter measuring device from the measured value D2 of the outer diameter measuring device after cooling at the same location of the traveling cable core, and the coating thickness T1 becomes the target coating thickness T. A method for controlling a coating thickness of an extrusion-coated cable, wherein the screw rotation speed of the extruder is controlled so as to approach. 請求項１記載の被覆厚制御方法において、被覆厚Ｔ１が、目標被覆厚Ｔより大きい場合は目標被覆厚Ｔに近づくようにスクリュー回転数を低下させ、目標被覆厚Ｔと同じ場合はスクリュー回転数をそのまま維持し、目標被覆厚Ｔより小さい場合は目標被覆厚Ｔに近づくようにスクリュー回転数を上昇させる制御を行うことを特徴とする押出被覆ケーブルの被覆厚制御方法。   2. The coating thickness control method according to claim 1, wherein when the coating thickness T1 is larger than the target coating thickness T, the screw rotational speed is lowered so as to approach the target coating thickness T. Is maintained, and when the thickness is smaller than the target coating thickness T, control is performed to increase the screw rotation speed so as to approach the target coating thickness T. 請求項１又は２記載の被覆厚制御方法において、押出機を出て冷却槽に入る前の押出被覆ケーブルの外径を測定する冷却前外径測定器をさらに設置し、
走行するケーブルの同じ箇所での冷却前外径測定器の測定値Ｄ３から冷却後外径測定器の測定値Ｄ２を減算して冷却による被覆の収縮厚Ｓ１を求め、その値から平均収縮厚Ave.Ｓ１を算出し、さらに、（被覆前外径測定器の測定値Ｄ１＋目標被覆厚Ｔ＋平均収縮厚Ave.Ｓ１）を演算して冷却前目標外径Ｄを求め、
冷却前外径測定器の測定値Ｄ３が、冷却前目標外径Ｄより大きい場合は冷却前目標外径Ｄに近づくようにスクリュー回転数を低下させ、冷却前目標外径Ｄと同じ場合はスクリュー回転数をそのまま維持し、冷却前目標外径Ｄより小さい場合は冷却前目標外径Ｄに近づくようにスクリュー回転数を上昇させる補正制御を行うことを特徴とする押出被覆ケーブルの被覆厚制御方法。 The coating thickness control method according to claim 1 or 2, further comprising a pre-cooling outer diameter measuring device for measuring the outer diameter of the extruded coated cable before exiting the extruder and entering the cooling tank,
By subtracting the measured value D2 of the outer diameter measuring device after cooling from the measured value D3 of the outer diameter measuring device before cooling at the same location of the traveling cable, the shrinkage thickness S1 of the coating by cooling is obtained, and the average shrinkage thickness Ave is obtained from that value. .S1 is calculated, and (target value D1 before coating outer diameter measuring device + target coating thickness T + average shrinkage thickness Ave.S1) is calculated to obtain a target outer diameter D before cooling,
When the measured value D3 of the pre-cooling outer diameter measuring device is larger than the pre-cooling target outer diameter D, the screw rotational speed is decreased so as to approach the pre-cooling target outer diameter D. A method for controlling the coating thickness of an extrusion-coated cable, wherein the rotational speed is maintained as it is, and when it is smaller than the target outer diameter D before cooling, correction control is performed to increase the screw rotational speed so as to approach the target outer diameter D before cooling. .
JP2006034152A 2006-02-10 2006-02-10 Method for controlling the coating thickness of extruded coated cables Active JP4851195B2 (en)

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