JP7372083B2 - Expanded particle manufacturing device and manufacturing method - Google Patents

Expanded particle manufacturing device and manufacturing method Download PDF

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JP7372083B2
JP7372083B2 JP2019158794A JP2019158794A JP7372083B2 JP 7372083 B2 JP7372083 B2 JP 7372083B2 JP 2019158794 A JP2019158794 A JP 2019158794A JP 2019158794 A JP2019158794 A JP 2019158794A JP 7372083 B2 JP7372083 B2 JP 7372083B2
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temperature
steam
foaming tank
pressure
valve
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JP2021037635A (en
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昌英 戎井
経宣 福田
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Kaneka Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Molding Of Porous Articles (AREA)
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  • Control Of Temperature (AREA)

Description

本発明は、発泡粒子の製造装置および製造方法に関する。 The present invention relates to an expanded particle manufacturing apparatus and manufacturing method.

熱可塑性樹脂からなる発泡粒子は、発泡槽内で分散剤を含む水中に熱可塑性樹脂粒子を分散させ、ついで揮発性発泡剤を添加し、高温高圧下に保って揮発性発泡剤を含浸させたのち、低圧雰囲気下に放出する方法（以下、除圧発泡法）により製造されることは知られている。 Expanded particles made of thermoplastic resin are obtained by dispersing thermoplastic resin particles in water containing a dispersant in a foaming tank, then adding a volatile blowing agent, and keeping the mixture under high temperature and pressure to impregnate the volatile blowing agent. It is known that the material is manufactured by a method in which the material is subsequently released into a low-pressure atmosphere (hereinafter referred to as a depressurized foaming method).

このような発泡粒子の製造方法である除圧発泡法では、各生産バッチでの発泡粒子の発泡倍率のバラツキを小さくするために、生産バッチ間での発泡槽内温バラツキを小さくすること、およびバッチ内での発泡槽の温度制御の精度が高いこと（±０．１℃レベル）が必要である。このため、発泡槽内の温度は、昇温から発泡終了までの間で精密に調節されている。図５は、発泡槽１内の温度を調節する従来の温調制御部の概略構成を模式的に示した図である。 In the depressurized foaming method, which is a method for manufacturing such foamed particles, in order to reduce the variation in the expansion ratio of the foamed particles in each production batch, it is necessary to reduce the variation in the temperature inside the foaming tank between production batches, and It is necessary that the temperature control of the foaming tank within a batch be highly accurate (±0.1°C level). For this reason, the temperature within the foaming tank is precisely regulated from the temperature rise until the end of foaming. FIG. 5 is a diagram schematically showing a schematic configuration of a conventional temperature control section that adjusts the temperature inside the foaming tank 1. As shown in FIG.

図５に示されるように、従来の発泡粒子の製造装置は、発泡槽１と温調制御部１００と、を備えている。発泡槽１には、その外周部を取り囲むように、ジャケット部２が設けられている。従来の温調制御部１００は、ジャケット部２に対して蒸気を供給する蒸気供給管路１１１を備えている。そして、蒸気供給管路１１１には、蒸気供給源から蒸気が供給される上流側から下流側（ジャケット部２側）へ向けて、減圧弁１１２、開閉弁１１３、および制御弁１１４がこの順に設けられている。減圧弁１１２は、蒸気供給源から流れる高圧の蒸気を減圧して、ジャケット部２へ供給する蒸気圧を一定に保つ。また、制御弁１１４は、上流側から流れる蒸気を所定の流量に調節し下流側へ送る。制御弁１１４は、温度指示調節器（ＴＩＣ）に接続されている。当該温度指示調節器は、発泡槽１内の温度の信号を受け、当該信号に基づいてＰＩＤ制御などのプロセス制御方式を用いて制御弁１１４の弁開度を調節する。これによって、蒸気供給管路１１１を流れる蒸気の流量が調節される。このように、従来の構成では、発泡槽１の昇温から発泡終了までの間、一定口径（呼び径）の蒸気供給管路１１１を用いて、ジャケット部２へ一定圧力の蒸気を供給するようになっている。そして、この一定圧力の蒸気の供給量を制御弁１１４により調節することによって、発泡槽１内の温度が調節される。 As shown in FIG. 5, the conventional foamed particle manufacturing apparatus includes a foaming tank 1 and a temperature control section 100. A jacket part 2 is provided in the foaming tank 1 so as to surround the outer periphery thereof. The conventional temperature control section 100 includes a steam supply pipe 111 that supplies steam to the jacket section 2 . The steam supply pipe 111 is provided with a pressure reducing valve 112, an on-off valve 113, and a control valve 114 in this order from the upstream side where steam is supplied from the steam supply source to the downstream side (jacket portion 2 side). It is being The pressure reducing valve 112 reduces the pressure of high-pressure steam flowing from a steam supply source and keeps the steam pressure supplied to the jacket portion 2 constant. Further, the control valve 114 adjusts the steam flowing from the upstream side to a predetermined flow rate and sends it to the downstream side. Control valve 114 is connected to a temperature indicating controller (TIC). The temperature indicating regulator receives a signal of the temperature inside the foaming tank 1, and adjusts the valve opening degree of the control valve 114 based on the signal using a process control method such as PID control. Thereby, the flow rate of steam flowing through the steam supply pipe 111 is adjusted. In this way, in the conventional configuration, steam at a constant pressure is supplied to the jacket part 2 using the steam supply pipe 111 having a constant diameter (nominal diameter) from the time when the temperature of the foaming tank 1 increases until the end of foaming. It has become. The temperature inside the foaming tank 1 is adjusted by adjusting the supply amount of this constant pressure steam using the control valve 114.

各生産バッチで発泡倍率バラツキが小さい発泡粒子を製造する上で、発泡槽内の温度を精密に制御することは重要である。発泡槽１の内部は最大１６０℃へ加熱する必要があるため、ジャケット部２へ蒸気を供給して加熱する。そのため、（ａ）加熱のみ（冷却しない）の温度制御となること、（ｂ）発泡槽１の熱容量が大きいことから、温調制御部１００による発泡槽１の内温測定値の応答遅れ時間が長く、精度良く内温を制御することは難しい。図５に示された従来の装置では、発泡槽１内の温度を精密に制御する点において、改善の余地がある。 Precise control of the temperature in the foaming tank is important in producing foamed particles with small variations in expansion ratio in each production batch. Since the inside of the foaming tank 1 needs to be heated to a maximum of 160° C., steam is supplied to the jacket portion 2 to heat it. Therefore, (a) the temperature control is only heating (not cooling), and (b) the heat capacity of the foaming tank 1 is large, so the response delay of the internal temperature measurement value of the foaming tank 1 by the temperature control unit 100 is It is difficult to control the internal temperature with high precision over a long period of time. The conventional device shown in FIG. 5 has room for improvement in terms of precisely controlling the temperature inside the foaming tank 1.

本発明の一態様は、発泡槽内の温度を精密に制御することが可能な発泡粒子の製造装置および製造方法を実現することを目的とする。 An object of one aspect of the present invention is to realize a foamed particle manufacturing apparatus and manufacturing method that can precisely control the temperature within a foaming tank.

上記の課題を解決するために、本発明の一態様に係る発泡粒子の製造装置は、発泡槽と、前記発泡槽の外周部に設けられたジャケット部と、前記ジャケット部へ蒸気を供給する供給管を有し、前記発泡槽内の温度を調節する温調制御部と、を備え、前記温調制御部は、前記ジャケット部へ供給される蒸気の圧力を一定に保つ第１の減圧弁と、前記第１の減圧弁の下流側から分岐し、蒸気供給量が互いに異なる複数の分岐管と、前記複数の分岐管の開閉切替を制御するための切替制御部と、前記複数の分岐管の少なくとも１つに設けられ、当該分岐管での蒸気量を調節する第１の制御弁と、を備えたことを特徴としている。 In order to solve the above problems, an apparatus for manufacturing expanded particles according to one aspect of the present invention includes a foaming tank, a jacket part provided on the outer periphery of the foaming tank, and a supply supply for supplying steam to the jacket part. a temperature control section that has a pipe and adjusts the temperature within the foaming tank, and the temperature control section includes a first pressure reducing valve that maintains a constant pressure of the steam supplied to the jacket section. , a plurality of branch pipes branching from the downstream side of the first pressure reducing valve and having different steam supply amounts; a switching control unit for controlling opening/closing switching of the plurality of branch pipes; and a switching control unit for controlling switching of the plurality of branch pipes. The branch pipe is characterized in that it includes a first control valve provided in at least one of the branch pipes to adjust the amount of steam in the branch pipe.

また、上記の課題を解決するために、本発明の一態様に係る発泡粒子の製造装置は、発泡槽と、前記発泡槽の外周部に設けられたジャケット部と、前記ジャケット部へ蒸気を供給する供給管を有し、前記発泡槽内の温度を調節する温調制御部と、を備え、前記温調制御部は、前記供給管に設けられ、上流側の蒸気供給源から送られる蒸気の圧力を減圧して、下流側へ送る第２の減圧弁と、前記供給管における前記第２の減圧弁の下流側に設けられ、前記ジャケット部への蒸気流量を調節する第２の制御弁と、前記第２の減圧弁を制御し、前記供給管を流れる蒸気の圧力を上昇または降下させる減圧弁圧力制御部と、を備えたことを特徴としている。 Furthermore, in order to solve the above problems, an apparatus for manufacturing expanded particles according to one aspect of the present invention includes a foaming tank, a jacket part provided on the outer periphery of the foaming tank, and supplying steam to the jacket part. a temperature control section that is provided in the supply pipe and that controls the temperature of the steam sent from the upstream steam supply source. a second pressure reducing valve that reduces the pressure and sends it to the downstream side; a second control valve that is provided downstream of the second pressure reducing valve in the supply pipe and adjusts the flow rate of steam to the jacket portion; , a pressure reducing valve pressure control section that controls the second pressure reducing valve and increases or decreases the pressure of steam flowing through the supply pipe.

また、上記の課題を解決するために、本発明の一態様に係る発泡粒子の製造方法は、発泡槽と、前記発泡槽の周囲に設けられたジャケット部と、前記ジャケット部へ蒸気を供給する供給管を有し、前記発泡槽内の温度を調節する温調制御部と、を備え、前記温調制御部は、前記ジャケット部へ供給される蒸気の圧力を一定に保つ第１の減圧弁と、前記第１の減圧弁の下流側から分岐し、蒸気供給量が互いに異なる複数の分岐管と、前記複数の分岐管の少なくとも１つに設けられた第１の制御弁と、を備えた製造装置を用いた発泡粒子の製造方法において、前記複数の分岐管の開閉切替を制御するとともに、当該分岐管での蒸気量を前記第１の制御弁により調節することを特徴としている。 Furthermore, in order to solve the above problems, a method for manufacturing expanded particles according to one aspect of the present invention includes a foaming tank, a jacket part provided around the foaming tank, and supplying steam to the jacket part. a temperature control section that has a supply pipe and adjusts the temperature within the foaming tank; the temperature control section includes a first pressure reducing valve that maintains a constant pressure of the steam supplied to the jacket section; and a plurality of branch pipes branching from the downstream side of the first pressure reducing valve and having mutually different steam supply amounts, and a first control valve provided in at least one of the plurality of branch pipes. The method for manufacturing expanded particles using a manufacturing apparatus is characterized in that opening and closing switching of the plurality of branch pipes is controlled, and the amount of steam in the branch pipes is adjusted by the first control valve.

また、上記の課題を解決するために、本発明の一態様に係る発泡粒子の製造方法は、発泡槽と、前記発泡槽の周囲に設けられたジャケット部と、前記ジャケット部へ蒸気を供給する供給管を有し、前記発泡槽内の温度を調節する温調制御部と、を備え、前記温調制御部は、前記供給管に設けられ、上流側の蒸気供給源から送られる蒸気の圧力を減圧して、下流側へ送る第２の減圧弁と、前記供給管における前記第２の減圧弁の下流側に設けられた第２の制御弁と、を備えた製造装置を用いた発泡粒子の製造方法において、前記第２の減圧弁を制御し、前記供給管を流れる蒸気の圧力を上昇または降下させるとともに、前記ジャケット部への蒸気流量を前記第２の制御弁により調節することを特徴としている。 Furthermore, in order to solve the above problems, a method for manufacturing expanded particles according to one aspect of the present invention includes a foaming tank, a jacket part provided around the foaming tank, and supplying steam to the jacket part. a temperature control section that has a supply pipe and adjusts the temperature in the foaming tank, and the temperature control section is provided in the supply pipe and controls the pressure of steam sent from an upstream steam supply source. Foamed particles using a production device including a second pressure reducing valve that reduces the pressure and sends it to the downstream side, and a second control valve provided on the downstream side of the second pressure reducing valve in the supply pipe. In the manufacturing method, the second pressure reducing valve is controlled to increase or decrease the pressure of steam flowing through the supply pipe, and the flow rate of steam to the jacket portion is adjusted by the second control valve. It is said that

本発明の一態様によれば、発泡槽内の温度を精密に制御することができる。 According to one aspect of the present invention, the temperature within the foaming tank can be precisely controlled.

本発明の実施形態１に係る発泡粒子の製造装置の概略構成を模式的に示した図である。1 is a diagram schematically showing a schematic configuration of an expanded particle manufacturing apparatus according to Embodiment 1 of the present invention. 発泡工程中の発泡槽の内温設定の一例、および当該内温設定に対応した実施形態１に係る製造装置における複数の分岐管の切替制御を示すグラフである。It is a graph which shows an example of the internal temperature setting of the foaming tank during a foaming process, and the switching control of the several branch pipe in the manufacturing apparatus based on Embodiment 1 corresponding to the said internal temperature setting. 本発明の実施形態２に係る発泡粒子の製造装置の概略構成を模式的に示した図である。FIG. 2 is a diagram schematically showing a schematic configuration of an expanded particle manufacturing apparatus according to Embodiment 2 of the present invention. 発泡工程中の発泡槽の内温設定の一例、および当該内温設定に対応した実施形態２に係る製造装置における複数の分岐管の切替制御を示すグラフである。It is a graph which shows an example of the internal temperature setting of the foaming tank during a foaming process, and the switching control of the several branch pipe in the manufacturing apparatus based on Embodiment 2 corresponding to the said internal temperature setting. 従来の発泡粒子の製造装置の概略構成を模式的に示した図である。1 is a diagram schematically showing a schematic configuration of a conventional foamed particle manufacturing apparatus.

〔実施形態１〕
以下、本発明の一実施形態について、詳細に説明する。図１は、本実施形態に係る発泡粒子の製造装置の概略構成を模式的に示した図である。 [Embodiment 1]
Hereinafter, one embodiment of the present invention will be described in detail. FIG. 1 is a diagram schematically showing a schematic configuration of an expanded particle manufacturing apparatus according to the present embodiment.

図１に示されるように、本実施形態に係る発泡粒子の製造装置は、発泡槽１と、ジャケット部２と、温調制御部１０と、を備えている。発泡槽１は、発泡粒子の製造に使用される従来公知のものであれば、特に限定されない。ジャケット部２は、発泡槽１と離間するように、発泡槽１の外周部を覆うように設けられている。 As shown in FIG. 1, the expanded particle manufacturing apparatus according to the present embodiment includes a foaming tank 1, a jacket section 2, and a temperature control section 10. The foaming tank 1 is not particularly limited as long as it is a conventionally known foaming tank used for producing foamed particles. The jacket part 2 is provided so as to cover the outer peripheral part of the foaming tank 1 so as to be spaced apart from the foaming tank 1.

温調制御部１０は、ジャケット部２に蒸気を供給する供給管１１を有している。供給管１１から供給される蒸気は、発泡槽１とジャケット部２との間の空間に満たされる。そして、この蒸気によって、発泡槽１の内部は加熱される。温調制御部１０は、ジャケット部２へ供給される蒸気量を調節することによって、発泡槽１内の温度を調節する。なお、本実施形態では、供給管１１を流れる加熱媒体として蒸気を用いている。しかし、供給管１１を流れる加熱媒体は、これに限定されるものではなく、発泡槽１に投入される熱可塑性樹脂の種類に応じて他の加熱媒体、例えば、オイル、加熱空気、蒸気と加熱空気との混合媒体などを用いることができる。 The temperature control section 10 has a supply pipe 11 that supplies steam to the jacket section 2 . Steam supplied from the supply pipe 11 fills the space between the foaming tank 1 and the jacket part 2. The inside of the foaming tank 1 is heated by this steam. The temperature control section 10 regulates the temperature within the foaming tank 1 by regulating the amount of steam supplied to the jacket section 2 . Note that in this embodiment, steam is used as the heating medium flowing through the supply pipe 11. However, the heating medium flowing through the supply pipe 11 is not limited to this, and depending on the type of thermoplastic resin introduced into the foaming tank 1, other heating media may be used, such as oil, heated air, steam, or heating medium. A mixed medium with air can be used.

温調制御部１０は、供給管１１と、減圧弁１２（第１の減圧弁）と、開閉弁１３ａ～１３ｃと、制御弁１４ｂおよび１４ｃ（第１の制御弁）と、を備えている。減圧弁１２は、上流側の蒸気供給源から送られる高圧蒸気の圧力を最適圧力に減圧する弁であり、ジャケット部２へ供給される蒸気の圧力を一定に保つ。 The temperature control unit 10 includes a supply pipe 11, a pressure reducing valve 12 (first pressure reducing valve), on-off valves 13a to 13c, and control valves 14b and 14c (first control valves). The pressure reducing valve 12 is a valve that reduces the pressure of high-pressure steam sent from an upstream steam supply source to an optimal pressure, and keeps the pressure of the steam supplied to the jacket portion 2 constant.

分岐管１１ａ～１１ｃは、供給管１１における減圧弁１２の下流側から分岐している。分岐管１１ａ～１１ｃはそれぞれ、蒸気供給量が異なるように構成されている。分岐管１１ａ～１１ｃは、この順で蒸気供給量が大きくなるように構成されている。図１に示される構成において、例えば、発泡槽１の容量２～４ｍ３に対して、分岐管１１ａは、呼び径５０Ａ（外径：６０．５ｍｍ）であり、分岐管１１ｂは、呼び径２５Ａ（外径：３４．０ｍｍ）であり、分岐管１１ｃは、呼び径１５Ａ（外径：２１．７ｍｍ）である。 The branch pipes 11a to 11c are branched from the supply pipe 11 downstream of the pressure reducing valve 12. The branch pipes 11a to 11c are configured to supply different amounts of steam, respectively. The branch pipes 11a to 11c are configured so that the amount of steam supplied increases in this order. In the configuration shown in FIG. 1, for example, for a capacity of 2 to 4 m 3 of the foaming tank 1, the branch pipe 11a has a nominal diameter of 50 A (outer diameter: 60.5 mm), and the branch pipe 11b has a nominal diameter of 25 A. (outer diameter: 34.0 mm), and the branch pipe 11c has a nominal diameter of 15A (outer diameter: 21.7 mm).

開閉弁１３ａ～１３ｃはそれぞれ、分岐管１１ａ～１１ｃの開閉を切替える弁である。本実施形態に係る製造装置では、供給管１１における減圧弁１２の下流側で、蒸気供給量が異なる３つの分岐管に分岐されている。そして、開閉弁１３ａ～１３ｃにより、分岐管１１ａ～１１ｃそれぞれの開閉が切り替えられるようになっている。 The on-off valves 13a to 13c are valves that open and close the branch pipes 11a to 11c, respectively. In the manufacturing apparatus according to this embodiment, the supply pipe 11 is branched into three branch pipes with different amounts of steam supplied on the downstream side of the pressure reducing valve 12. Opening and closing of the branch pipes 11a to 11c can be switched by the on-off valves 13a to 13c.

本実施形態に係る製造装置では、分岐管１１ａ～１１ｃそれぞれにおいて、蒸気供給量が調節されるようになっている。制御弁１４ｂおよび１４ｃはそれぞれ、分岐管１１ｂおよび１１ｃの呼び径に対応した接続径を有し、分岐管１１ｂおよび１１ｃに接続されている。制御弁１４ｂは、分岐管１１ｂでの蒸気量を調節する弁であり、制御弁１４ｃは、分岐管１１ｃでの蒸気量を調節する弁である。制御弁１４ｂおよび１４ｃには、発泡槽１またはジャケット部２内の温度の測定値等がフィードバック制御される。制御弁１４ｂおよび１４ｃはそれぞれ、フィードバックされた前記測定値等に基づいて、分岐管１１ｂおよび１１ｃを流れる蒸気量を調節する。具体的には、制御弁１４ｂおよび１４ｃはそれぞれ、温度指示調節器（ＴＩＣ）に接続されている。当該温度指示調節器は、発泡槽１内の設定温度のデータが与えられ、発泡槽１内の温度データを測定し、設定温度データおよび測定温度データの両信号からＰＩＤ制御等のプロセス制御方式によって、発泡槽１内の温度が前記設定温度になるように、制御弁１４ｂおよび／または１４ｃの弁開度を制御する。これによって、分岐管１１ｂおよび／または１１ｃを流れる蒸気の流量が調節される。また、蒸気供給量が最も大きい分岐管１１ａには、制御弁が設けられていない。 In the manufacturing apparatus according to this embodiment, the amount of steam supplied is adjusted in each of the branch pipes 11a to 11c. The control valves 14b and 14c each have a connection diameter corresponding to the nominal diameter of the branch pipes 11b and 11c, and are connected to the branch pipes 11b and 11c. The control valve 14b is a valve that adjusts the amount of steam in the branch pipe 11b, and the control valve 14c is a valve that adjusts the amount of steam in the branch pipe 11c. The control valves 14b and 14c are feedback-controlled with the measured value of the temperature inside the foaming tank 1 or the jacket section 2, and the like. The control valves 14b and 14c respectively adjust the amount of steam flowing through the branch pipes 11b and 11c based on the fed-back measurement values and the like. Specifically, control valves 14b and 14c are each connected to a temperature indicating controller (TIC). The temperature indicating regulator is given data on the set temperature in the foaming tank 1, measures the temperature data in the foaming tank 1, and uses a process control method such as PID control based on both signals of the set temperature data and measured temperature data. The valve opening degrees of the control valves 14b and/or 14c are controlled so that the temperature inside the foaming tank 1 reaches the set temperature. This adjusts the flow rate of steam flowing through the branch pipes 11b and/or 11c. Further, the branch pipe 11a that supplies the largest amount of steam is not provided with a control valve.

本実施形態に係る製造装置は、開閉弁切替制御部２１（切替制御部）を備えている。開閉弁切替制御部２１は、開閉弁１３ａ～１３ｃの開閉切替を制御するためのものである。開閉弁切替制御部２１は、発泡工程中の発泡槽１内の温度に応じて、開閉弁１３ａ～１３ｃの開閉切替を制御する。開閉弁切替制御部２１によって分岐管１１ａ～１１ｃの開閉が切り替えられるので、この切り替えに応じて、ジャケット部２へ供給される蒸気量は変化する。 The manufacturing apparatus according to this embodiment includes an on-off valve switching control section 21 (switching control section). The on-off valve switching control section 21 is for controlling the on-off switching of the on-off valves 13a to 13c. The on-off valve switching control section 21 controls the on-off switching of the on-off valves 13a to 13c according to the temperature inside the foaming tank 1 during the foaming process. Since the opening/closing of the branch pipes 11a to 11c is switched by the on-off valve switching control section 21, the amount of steam supplied to the jacket section 2 changes in accordance with this switching.

（開閉弁切替制御部２１による蒸気供給量の制御）
本実施形態に係る製造装置では、ジャケット部２への蒸気供給量の範囲は、開閉弁切替制御部２１によって制御されている。また、本実施形態に係る発泡粒子の製造方法は、図１に示した製造装置を用いた方法であり、複数の分岐管１１ａ～１１ｃの開閉切替を制御するとともに、分岐管１１ｂおよび１１ｃでの蒸気量を制御弁１４ｂおよび１４ｃにより調節する。そして、このような制御方式により、発泡工程中の発泡槽１内の昇温から発泡終了までの発泡槽１内の温度が精密に制御され得る。 (Control of steam supply amount by on-off valve switching control unit 21)
In the manufacturing apparatus according to this embodiment, the range of the amount of steam supplied to the jacket section 2 is controlled by the on-off valve switching control section 21. Further, the method for manufacturing expanded particles according to the present embodiment is a method using the manufacturing apparatus shown in FIG. The amount of steam is adjusted by control valves 14b and 14c. With such a control system, the temperature inside the foaming tank 1 from the temperature increase in the foaming tank 1 during the foaming process until the end of foaming can be precisely controlled.

開閉弁切替制御部２１による蒸気供給量の制御について、図２を参照して説明する。図２は、発泡工程中の発泡槽１の内温設定の一例、および当該内温設定に対応した分岐管１１ａ～１１ｃの切替制御を示すグラフである。なお、図２においては、分岐管１１ａの口径をＤ１とし、分岐管１１ｂの口径をＤ２とし、分岐管１１ｃの口径をＤ３としている。そして、口径Ｄ１～Ｄ３の大きさは、Ｄ１＞Ｄ２＞Ｄ３となっている。 Control of the amount of steam supplied by the on-off valve switching control section 21 will be explained with reference to FIG. 2. FIG. 2 is a graph showing an example of the internal temperature setting of the foaming tank 1 during the foaming process and switching control of the branch pipes 11a to 11c corresponding to the internal temperature setting. In addition, in FIG. 2, the diameter of the branch pipe 11a is set to D1, the diameter of the branch pipe 11b is set to D2, and the diameter of the branch pipe 11c is set to D3. The sizes of the apertures D1 to D3 are such that D1>D2>D3.

まず、開閉弁切替制御部２１は、開閉弁１３ａのみを開放して発泡槽１の昇温をスタートさせる。これにより、分岐管１１ａのみを通過して蒸気がジャケット部２へ流れる。このとき、分岐管１１ａの口径Ｄ１は、分岐管１１ａ～１１ｃの口径の中で最も大きい口径である。それゆえ、ジャケット部２への蒸気供給量が最も大きくなる。このため、ジャケット部２には分岐管１１ａを介して最大量の蒸気が供給され続ける。これにより、発泡槽１内の温度を速く上昇させることができる（発泡槽１の内温上昇速度：傾きＳ１）。 First, the on-off valve switching control section 21 opens only the on-off valve 13a and starts raising the temperature of the foaming tank 1. Thereby, the steam flows to the jacket part 2 passing only through the branch pipe 11a. At this time, the diameter D1 of the branch pipe 11a is the largest diameter among the diameters of the branch pipes 11a to 11c. Therefore, the amount of steam supplied to the jacket portion 2 is the largest. Therefore, the maximum amount of steam continues to be supplied to the jacket portion 2 via the branch pipe 11a. Thereby, the temperature inside the foaming tank 1 can be quickly raised (rate of increase in internal temperature of the foaming tank 1: slope S1).

次いで、発泡槽１内の温度が所定の設定温度Ｔ１に到達した後、所定のタイミングで、開閉弁切替制御部２１は、開閉弁１３ａを閉じ開閉弁１３ｂのみを開放するように制御する。このとき、分岐管１１ｂのみを通過した蒸気がジャケット部２へ流れる。温度指示調節器（ＴＩＣ）は、発泡槽１内の温度が設定温度Ｔ１から設定温度Ｔ２へ到達するように、制御弁１４ｂの弁開度を調節する。この制御弁１４ｂの調節により、ジャケット部２への蒸気供給量が調節される。分岐管１１ｂの口径Ｄ２が分岐管１１ａの口径Ｄ１よりも小さいので、ジャケット部２への蒸気供給速度は減少する。このような蒸気供給速度が減少した状態で、発泡槽１内の温度を設定温度Ｔ２へオーバーシュートせずに到達させるために、温度指示調節器（ＴＩＣ）には、内温上昇速度が異なる２本の折れ線（発泡槽１の内温上昇速度：傾きＳ２、Ｓ２’、傾きの大きさ：Ｓ２＞Ｓ２’）として発泡槽１内の温度の設定値が与えられる。また、温度指示調節器（ＴＩＣ）は、発泡槽１内の温度測定値に基づいて、発泡槽１内の温度が前記折れ線の設定値に沿うように、制御弁１４ｂの開弁度を調節し、これによりジャケット部２への蒸気供給量が調節される。このような蒸気供給量の調節により、発泡槽１内の温度を設定温度Ｔ１からゆるやかに上昇させて、目標の設定温度Ｔ２に到達させることができる。 Next, after the temperature in the bubbling tank 1 reaches a predetermined set temperature T1, the on-off valve switching control section 21 controls the on-off valve 13a to close and only the on-off valve 13b to open at a predetermined timing. At this time, the steam that has passed only through the branch pipe 11b flows to the jacket portion 2. The temperature indication controller (TIC) adjusts the valve opening degree of the control valve 14b so that the temperature in the foaming tank 1 reaches the set temperature T2 from the set temperature T1. By adjusting the control valve 14b, the amount of steam supplied to the jacket portion 2 is adjusted. Since the diameter D2 of the branch pipe 11b is smaller than the diameter D1 of the branch pipe 11a, the rate of steam supply to the jacket portion 2 is reduced. In order to make the temperature in the foaming tank 1 reach the set temperature T2 without overshooting under such a reduced steam supply rate, the temperature indication controller (TIC) is equipped with two controllers with different internal temperature rise rates. The set value of the temperature inside the foaming tank 1 is given as a polygonal line (rate of increase in internal temperature of the foaming tank 1: slope S2, S2', magnitude of slope: S2>S2'). Further, the temperature indication controller (TIC) adjusts the degree of opening of the control valve 14b based on the measured temperature value in the foaming tank 1 so that the temperature in the foaming tank 1 follows the set value of the polygonal line. , whereby the amount of steam supplied to the jacket section 2 is adjusted. By adjusting the amount of steam supplied in this manner, the temperature in the foaming tank 1 can be gradually raised from the set temperature T1 to reach the target set temperature T2.

さらに、発泡槽１内の温度が設定温度Ｔ２に到達した後、所定のタイミングで、開閉弁切替制御部２１は、開閉弁１３ｂを閉じ開閉弁１３ｃのみを開放するように制御する。このとき、分岐管１１ｃのみを通過して蒸気がジャケット部２へ流れる。温度指示調節器（ＴＩＣ）は、発泡槽１内の温度が設定温度Ｔ２から設定温度Ｔ３へ到達するように、制御弁１４ｃの弁開度を調節する。この制御弁１４ｃの調節により、ジャケット部２への蒸気供給量が調節される。分岐管１１ｃの口径Ｄ３は、分岐管１１ｂの口径Ｄ２よりも小さので、ジャケット部２への蒸気供給速度はさらに減少する。このような蒸気供給速度が減少した状態で、発泡槽１内の温度を目標の設定温度Ｔ３へオーバーシュートせずに到達させるために、温度指示調節器（ＴＩＣ）には、設定温度Ｔ２から設定温度Ｔ３へ向かう直線として発泡槽１内の温度の設定値が与えられる。また、温度指示調節器（ＴＩＣ）は、発泡槽１内の温度測定値に基づいて、発泡槽１内の温度が設定温度Ｔ２から目標の設定温度Ｔ３への設定値の直線に沿うように、制御弁１４ｃの弁開度を調節し、これにより、ジャケット部２への蒸気供給量が調節される。このような蒸気供給量の調節により、発泡槽１内の温度を目標の設定温度Ｔ３に到達させることができる（発泡槽１の内温上昇速度：傾きＳ３）。 Furthermore, after the temperature in the foaming tank 1 reaches the set temperature T2, the on-off valve switching control section 21 controls the on-off valve 13b to close and only the on-off valve 13c to open at a predetermined timing. At this time, the steam flows to the jacket portion 2 through only the branch pipe 11c. The temperature indication controller (TIC) adjusts the valve opening degree of the control valve 14c so that the temperature in the foaming tank 1 reaches the set temperature T3 from the set temperature T2. By adjusting the control valve 14c, the amount of steam supplied to the jacket portion 2 is adjusted. Since the diameter D3 of the branch pipe 11c is smaller than the diameter D2 of the branch pipe 11b, the steam supply speed to the jacket portion 2 is further reduced. In order to make the temperature in the foaming tank 1 reach the target set temperature T3 without overshooting under such a reduced steam supply rate, the temperature indicating controller (TIC) has a setting temperature from the set temperature T2. The set value of the temperature in the foaming tank 1 is given as a straight line heading towards the temperature T3. Further, the temperature indication controller (TIC) is configured to adjust the temperature in the foaming tank 1 based on the measured temperature value in the foaming tank 1 so that the temperature in the foaming tank 1 follows a straight line from the set temperature T2 to the target set temperature T3. The valve opening degree of the control valve 14c is adjusted, and thereby the amount of steam supplied to the jacket portion 2 is adjusted. By adjusting the amount of steam supplied in this manner, the temperature inside the foaming tank 1 can be made to reach the target set temperature T3 (rate of increase in internal temperature of the foaming tank 1: slope S3).

このように開閉弁切替制御部２１は、蒸気供給量が最も大きい分岐管１１ａから蒸気供給量が最も小さい分岐管１１ｃへ順に、開閉を切替えるように構成されている。これにより、発泡槽１内の温度は、設定温度Ｔ１から設定温度Ｔ３へと、精密にかつ再現性を高めて調節できる。本実施形態に係る製造装置によれば、発泡槽１内の温度を最大１６０℃で±０．１℃以内に精密に制御することができる。 In this way, the on-off valve switching control unit 21 is configured to switch opening and closing in order from the branch pipe 11a with the largest amount of steam supply to the branch pipe 11c with the smallest amount of steam supply. Thereby, the temperature in the foaming tank 1 can be adjusted from the set temperature T1 to the set temperature T3 with precision and improved reproducibility. According to the manufacturing apparatus according to this embodiment, the temperature inside the foaming tank 1 can be precisely controlled to within ±0.1°C at a maximum of 160°C.

このように、本実施形態に係る製造装置では、開閉弁切替制御部２１による開閉弁１３ａ～１３ｃの切替制御により、発泡槽１内の温度を、設定温度Ｔ１、Ｔ２およびＴ３に３段階で制御することができる。それゆえ、本実施形態に係る製造装置によれば、従来の製造装置と比較して、精密にかつ再現性を高めて発泡槽１内の温度を制御することができる。 As described above, in the manufacturing apparatus according to the present embodiment, the temperature in the foaming tank 1 is controlled in three stages to set temperatures T1, T2, and T3 by switching control of the on-off valves 13a to 13c by the on-off valve switching control section 21. can do. Therefore, according to the manufacturing apparatus according to the present embodiment, the temperature inside the foaming tank 1 can be controlled more precisely and with improved reproducibility compared to conventional manufacturing apparatuses.

図１に示される構成では、供給管１１は３つの分岐管１１ａ～１１ｃを有していた。しかし、本実施形態に係る製造装置において、分岐管の数は、複数であればよく、発泡槽１の寸法（容量）または発泡工程中の発泡槽１内の温度制御の方法や精度に応じて適宜設定可能である。また、分岐管１１ａ～１１ｃの蒸気供給量を規定する呼び径も、図１に示される構成に限定されず、発泡槽１の寸法または発泡工程中の発泡槽１内の温度制御の精度に応じて適宜設定可能である。 In the configuration shown in FIG. 1, the supply pipe 11 had three branch pipes 11a to 11c. However, in the manufacturing apparatus according to the present embodiment, the number of branch pipes may be plural and may vary depending on the dimensions (capacity) of the foaming tank 1 or the method and accuracy of temperature control in the foaming tank 1 during the foaming process. It can be set as appropriate. Further, the nominal diameter that defines the steam supply amount of the branch pipes 11a to 11c is not limited to the configuration shown in FIG. It can be set as appropriate.

本実施形態における制御弁は、分岐管１１ａ～１１ｃの少なくとも１つに設けられていればよい。例えば、発泡槽１内の昇温初期に使用される分岐管１１ａには、制御弁が設けられていてもよいし、図１に示すように制御弁が設けられていなくてもよい。制御弁の設置の有無は、分岐管の構成または発泡槽１内の温度制御動作に応じて適宜設定することができる。また、制御弁１４ｂおよび１４ｃは、従来公知の制御弁であればよい。制御弁１４ｂおよび１４ｃは、発泡槽１内の温度測定値のデータをフィードバックする構成に限定されない。 The control valve in this embodiment may be provided in at least one of the branch pipes 11a to 11c. For example, the branch pipe 11a used in the initial stage of temperature rise in the foaming tank 1 may be provided with a control valve, or may not be provided with a control valve as shown in FIG. Whether or not to install a control valve can be determined as appropriate depending on the configuration of the branch pipe or the temperature control operation within the foaming tank 1. Further, the control valves 14b and 14c may be any conventionally known control valves. The control valves 14b and 14c are not limited to a configuration that feeds back data of the temperature measurement value within the foaming tank 1.

また、開閉弁切替制御部２１は、開閉弁１３ａ～１３ｃの開閉切替を制御するためのものである。開閉弁切替制御部２１の切り替え動作は、分岐管１１ａから分岐管１１ｃへ順に、開閉を切替える動作に限定されない。例えば、開閉弁切替制御部２１は、開閉弁１３ａ～１３ｃのうち、２つの開閉弁を開くと共に、残りの開閉弁を閉じるように制御してもよい。この場合、開閉弁切替制御部２１は、前記２つの開閉弁について開放度合いを変えて制御してもよい。例えば、一方の開閉弁が１００％開放する一方、他方の開閉弁は２５％開放するように、開閉弁切替制御部２１は、前記２つの開閉弁を制御してもよい。 Further, the on-off valve switching control section 21 is for controlling the on-off switching of the on-off valves 13a to 13c. The switching operation of the on-off valve switching control section 21 is not limited to the operation of sequentially switching opening and closing from the branch pipe 11a to the branch pipe 11c. For example, the on-off valve switching control section 21 may control to open two on-off valves among the on-off valves 13a to 13c, and close the remaining on-off valves. In this case, the on-off valve switching control section 21 may control the two on-off valves by changing the degree of opening. For example, the on-off valve switching control unit 21 may control the two on-off valves so that one on-off valve opens 100% while the other on-off valve opens 25%.

また、開閉弁切替制御部２１は、開閉弁１３ａ～１３ｃの開閉切替を制御することができる要素または部材で構成されていればよい。例えば、開閉弁切替制御部２１は、発泡槽１内の温度を測定する測定機能と、測定温度が所定温度（例えば設定温度Ｔ１、Ｔ２またはＴ３）を超える、あるいは下回ったときに発泡槽１内の温度を前記所定温度に制御する制御機能と、発泡槽１内の温度が前記所定温度に到達したことを使用者に通知する通知機能と、を備えた構成であってもよい。 Further, the on-off valve switching control section 21 may be composed of any element or member that can control the on-off switching of the on-off valves 13a to 13c. For example, the on-off valve switching control unit 21 has a measurement function that measures the temperature inside the foaming tank 1, and a function that measures the temperature inside the foaming tank 1 when the measured temperature exceeds or falls below a predetermined temperature (for example, set temperature T1, T2, or T3). The foaming tank 1 may be configured to include a control function for controlling the temperature within the foaming tank 1 to the predetermined temperature, and a notification function for notifying the user that the temperature within the foaming tank 1 has reached the predetermined temperature.

また、開閉弁切替制御部２１は、集積回路（ＩＣチップ）等に形成された論理回路（ハードウェア）によって実現してもよいし、ＣＰＵ（Central Processing Unit）を用いてソフトウェアによって実現してもよい。このような開閉弁切替制御部２１を備えたことによって、開閉弁１３ａ～１３ｃの開閉切替制御の自動化を実現することができる。 Further, the on-off valve switching control section 21 may be realized by a logic circuit (hardware) formed on an integrated circuit (IC chip) or the like, or may be realized by software using a CPU (Central Processing Unit). good. By providing such an on-off valve switching control section 21, automation of on-off switching control of the on-off valves 13a to 13c can be realized.

この場合、本実施形態に係る製造装置は、各機能を実現するソフトウェアであるプログラムの命令を実行するＣＰＵ、上記プログラムおよび各種データがコンピュータ（またはＣＰＵ）で読み取り可能に記録されたＲＯＭ（Read Only Memory）または記憶装置（これらを「記録媒体」と称する）、上記プログラムを展開するＲＡＭ（Random Access Memory）などを備えている。そして、コンピュータ（またはＣＰＵ）が上記プログラムを上記記録媒体から読み取って実行することにより、本開示の目的が達成される。上記記録媒体としては、「一時的でない有形の媒体」、例えば、テープ、ディスク、カード、半導体メモリ、プログラマブルな論理回路などを用いることができる。また、上記プログラムは、該プログラムを伝送可能な任意の伝送媒体（通信ネットワークや放送波等）を介して上記コンピュータに供給されてもよい。なお、本発明は、上記プログラムが電子的な伝送によって具現化された、搬送波に埋め込まれたデータ信号の形態でも実現され得る。 In this case, the manufacturing apparatus according to the present embodiment includes a CPU that executes instructions of a program that is software that implements each function, a ROM (Read Only memory) or a storage device (these are referred to as a "recording medium"), a RAM (Random Access Memory) for expanding the above program, and the like. Then, the object of the present disclosure is achieved by the computer (or CPU) reading the program from the recording medium and executing it. As the recording medium, a "non-temporary tangible medium" such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, etc. can be used. Furthermore, the program may be supplied to the computer via any transmission medium (communication network, broadcast waves, etc.) that can transmit the program. Note that the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

〔実施形態２〕
本発明の他の実施形態について、以下に説明する。なお、説明の便宜上、上記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を繰り返さない。図３は、本実施形態に係る発泡粒子の製造装置の概略構成を模式的に示した図である。 [Embodiment 2]
Other embodiments of the invention will be described below. For convenience of explanation, members having the same functions as the members described in the above embodiment are given the same reference numerals, and the description thereof will not be repeated. FIG. 3 is a diagram schematically showing a schematic configuration of an expanded particle manufacturing apparatus according to the present embodiment.

図３に示されるように、本実施形態に係る製造装置は、ジャケット部２へ蒸気を供給する供給管が分岐されていない点が前記実施形態１と異なる。当該製造装置では、温調制御部１０Ａは、ただ１つの供給管１１ｄを備えている。供給管１１ｄの呼び径は、８０Ａ（外径：８９．１ｍｍ）である。 As shown in FIG. 3, the manufacturing apparatus according to the present embodiment differs from the first embodiment in that the supply pipe that supplies steam to the jacket portion 2 is not branched. In the manufacturing apparatus, the temperature control section 10A includes only one supply pipe 11d. The nominal diameter of the supply pipe 11d is 80A (outer diameter: 89.1 mm).

温調制御部１０Ａは、減圧弁１５（第２の減圧弁）と、開閉弁１３ｄと、制御弁１４ｄ（第２の制御弁）と、を備えている。供給管１１ｄには、蒸気供給源がある上流側から下流側（ジャケット部２側）へ向かって、減圧弁１５、開閉弁１３ｄ、および制御弁１４ｄがこの順に設けられている。減圧弁１５は、上流側の蒸気供給源から送られる蒸気の圧力を減圧して、下流側へ送る弁である。また、開閉弁１３ｄは、供給管１１ｄを開閉するための弁である。 The temperature adjustment control unit 10A includes a pressure reducing valve 15 (second pressure reducing valve), an on-off valve 13d, and a control valve 14d (second control valve). The supply pipe 11d is provided with a pressure reducing valve 15, an on-off valve 13d, and a control valve 14d in this order from the upstream side where the steam supply source is located to the downstream side (jacket portion 2 side). The pressure reducing valve 15 is a valve that reduces the pressure of steam sent from an upstream steam supply source and sends it downstream. Moreover, the on-off valve 13d is a valve for opening and closing the supply pipe 11d.

また、制御弁１４ｄは、供給管１１ｄにおける減圧弁１５の下流側に設けられ、ジャケット部２への蒸気流量を調節するための弁である。制御弁１４ｄによって、発泡槽１またはジャケット部２内の温度の測定値等がフィードバック制御される。制御弁１４ｄは、フィードバックされた前記測定値等に基づいて、供給管１１ｄを流れる蒸気量を調節する。具体的には、制御弁１４ｄは、温度指示調節器（ＴＩＣ）に接続されている。当該温度指示調節器は、発泡槽１内の設定温度のデータが与えられ、発泡槽１内の温度データを測定し、設定温度データおよび測定温度データの両信号からＰＩＤ制御等のプロセス制御方式によって、発泡槽１内の温度が前記設定温度になるように、制御弁１４ｄの弁開度を制御する。これによって、供給管１１ｄを流れる蒸気の流量が調節される。 Further, the control valve 14d is provided on the downstream side of the pressure reducing valve 15 in the supply pipe 11d, and is a valve for adjusting the flow rate of steam to the jacket portion 2. The control valve 14d performs feedback control on the measured temperature inside the foaming tank 1 or the jacket section 2, and the like. The control valve 14d adjusts the amount of steam flowing through the supply pipe 11d based on the feedback measurement value and the like. Specifically, the control valve 14d is connected to a temperature indication controller (TIC). The temperature indicating regulator is given data on the set temperature in the foaming tank 1, measures the temperature data in the foaming tank 1, and uses a process control method such as PID control based on both signals of the set temperature data and measured temperature data. The opening degree of the control valve 14d is controlled so that the temperature inside the foaming tank 1 reaches the set temperature. This adjusts the flow rate of steam flowing through the supply pipe 11d.

本実施形態に係る製造装置は、減圧弁圧力制御部２２を備えている。減圧弁圧力制御部２２は、減圧弁１５を制御し、供給管１１ｄを流れる蒸気の圧力を上昇または降下させる。この減圧弁圧力制御部２２によって、ジャケット部２への蒸気の供給速度が変化する。そして、この変化に応じて、ジャケット部２へ供給される蒸気量は変化する。 The manufacturing apparatus according to this embodiment includes a pressure reducing valve pressure control section 22. The pressure reducing valve pressure control unit 22 controls the pressure reducing valve 15 to increase or decrease the pressure of steam flowing through the supply pipe 11d. This pressure reducing valve pressure control section 22 changes the supply speed of steam to the jacket section 2. According to this change, the amount of steam supplied to the jacket section 2 changes.

（減圧弁圧力制御部２２による蒸気供給量の制御）
本実施形態に係る製造装置では、ジャケット部２への蒸気供給圧力は、減圧弁圧力制御部２２によって制御されている。また、本実施形態に係る発泡粒子の製造方法は、図３に示した製造装置を用いた方法であり、減圧弁１５にて圧力設定し、供給管１１ｄを流れる蒸気の圧力を上昇または降下させるとともに、ジャケット部２への蒸気流量を制御弁１４ｄにより調節する。そして、このような制御により、発泡工程中の発泡槽１内の温度制御が精密に制御され得る。 (Control of steam supply amount by pressure reducing valve pressure control unit 22)
In the manufacturing apparatus according to this embodiment, the steam supply pressure to the jacket section 2 is controlled by a pressure reducing valve pressure control section 22. Further, the method for manufacturing expanded particles according to this embodiment is a method using the manufacturing apparatus shown in FIG. At the same time, the flow rate of steam to the jacket portion 2 is adjusted by the control valve 14d. Through such control, the temperature inside the foaming tank 1 during the foaming process can be precisely controlled.

減圧弁圧力制御部２２による蒸気供給量の制御について、図４を参照して説明する。図４は、発泡工程中の発泡槽１内の内温の時間的変化の一例、および当該時間的変化に対応した減圧弁１５の設定圧力切替制御を示す図である。なお、図４においては、減圧弁圧力制御部２２は、減圧弁１５の設定圧力をＰ１、Ｐ２、Ｐ３の３つの圧力に設定する。そして、設定圧力Ｐ１～Ｐ３の大きさは、Ｐ１＞Ｐ２＞Ｐ３となっている。 Control of the amount of steam supplied by the pressure reducing valve pressure control section 22 will be explained with reference to FIG. 4. FIG. 4 is a diagram showing an example of a temporal change in the internal temperature in the foaming tank 1 during the foaming process, and a setting pressure switching control of the pressure reducing valve 15 corresponding to the temporal change. In addition, in FIG. 4, the pressure reducing valve pressure control unit 22 sets the set pressures of the pressure reducing valve 15 to three pressures, P1, P2, and P3. The magnitudes of the set pressures P1 to P3 are such that P1>P2>P3.

まず、減圧弁圧力制御部２２は、供給管１１ｄを流れる蒸気の圧力が設定圧力Ｐ１となるように減圧弁１５を制御する。これにより、設定圧力Ｐ１の蒸気が供給管１１ｄを通過してジャケット部２へ流れる。このとき、ジャケット部２には設定圧力Ｐ１の蒸気が供され続け、発泡槽１内の温度は設定温度Ｔ１へ昇温される（発泡槽１の内温上昇速度：傾きＳ１）。 First, the pressure reducing valve pressure control unit 22 controls the pressure reducing valve 15 so that the pressure of steam flowing through the supply pipe 11d becomes the set pressure P1. As a result, steam at the set pressure P1 passes through the supply pipe 11d and flows to the jacket portion 2. At this time, steam at the set pressure P1 continues to be supplied to the jacket part 2, and the temperature inside the foaming tank 1 is raised to the set temperature T1 (rate of increase in internal temperature of the foaming tank 1: slope S1).

次いで、発泡槽１内の温度が所定の設定温度Ｔ１に到達した後、所定のタイミングで、減圧弁圧力制御部２２は、供給管１１ｄを流れる蒸気の圧力が設定圧力Ｐ１よりも低い設定圧力Ｐ２になるように、減圧弁１５を制御する。温度指示調節器（ＴＩＣ）は、発泡槽１内の温度が設定温度Ｔ１から設定温度Ｔ２へ到達するように、制御弁１４ｄの弁開度を調節する。この制御弁１４ｄの調節により、ジャケット部２への蒸気供給量が調節される。このとき、ジャケット部２へ供給される蒸気の圧力は、設定圧力Ｐ１よりも低い設定圧力Ｐ２となるので、ジャケット部２への蒸気供給速度は減少する。このような蒸気供給速度が減少した状態で、発泡槽１内の温度を設定温度Ｔ２へオーバーシュートせずに到達させるために、温度指示調節器（ＴＩＣ）には、内温上昇速度が異なる２本の折れ線（発泡槽１の内温上昇速度：傾きＳ２、Ｓ２’、傾きの大きさ：Ｓ２＞Ｓ２’）として発泡槽１内の温度の設定値が与えられる。また、温度指示調節器（ＴＩＣ）は、発泡槽１内の温度測定値に基づいて、発泡槽１内の温度が前記折れ線の設定値に沿うように、制御弁１４ｄの開弁度を調節し、これによりジャケット部２への蒸気供給量が調節される。このような蒸気供給量の調節により、発泡槽１内の温度を設定温度Ｔ１からゆるやかに上昇させて、目標の設定温度Ｔ２に到達させることができる。 Next, after the temperature in the foaming tank 1 reaches a predetermined set temperature T1, at a predetermined timing, the pressure reducing valve pressure control unit 22 sets the pressure of the steam flowing through the supply pipe 11d to a set pressure P2 lower than the set pressure P1. The pressure reducing valve 15 is controlled so that The temperature indication controller (TIC) adjusts the valve opening degree of the control valve 14d so that the temperature in the foaming tank 1 reaches the set temperature T2 from the set temperature T1. By adjusting the control valve 14d, the amount of steam supplied to the jacket portion 2 is adjusted. At this time, the pressure of the steam supplied to the jacket section 2 becomes a set pressure P2 lower than the set pressure P1, so the speed of steam supply to the jacket section 2 decreases. In order to make the temperature in the foaming tank 1 reach the set temperature T2 without overshooting under such a reduced steam supply rate, the temperature indication controller (TIC) is equipped with two controllers with different internal temperature rise rates. The set value of the temperature inside the foaming tank 1 is given as a polygonal line (rate of increase in internal temperature of the foaming tank 1: slope S2, S2', magnitude of slope: S2>S2'). Further, the temperature indication controller (TIC) adjusts the degree of opening of the control valve 14d based on the measured temperature value in the foaming tank 1 so that the temperature in the foaming tank 1 follows the set value of the polygonal line. , whereby the amount of steam supplied to the jacket section 2 is adjusted. By adjusting the amount of steam supplied in this manner, the temperature in the foaming tank 1 can be gradually raised from the set temperature T1 to reach the target set temperature T2.

さらに、発泡槽１内の温度が設定温度Ｔ２に到達した後、所定のタイミングで、減圧弁圧力制御部２２は、供給管１１ｄを流れる蒸気の圧力が設定圧力Ｐ２よりも低い設定圧力Ｐ３になるように、減圧弁１５を制御する。温度指示調節器（ＴＩＣ）は、発泡槽１内の温度が設定温度Ｔ２から設定温度Ｔ３へ到達するように、制御弁１４ｄの弁開度を調節する。この制御弁１４ｄの調節により、ジャケット部２への蒸気供給量が調節される。このとき、ジャケット部２へ供給される蒸気の圧力は、設定圧力Ｐ２よりも低い設定圧力Ｐ３となるので、ジャケット部２への蒸気供給速度はさらに減少する。このような蒸気供給速度が減少した状態で、発泡槽１内の温度を設定温度Ｔ３へオーバーシュートせずに到達させるために、温度指示調節器（ＴＩＣ）には、設定温度Ｔ２から設定温度Ｔ３へ向かう直線として発泡槽１内の温度の設定値が与えられる。また、温度指示調節器（ＴＩＣ）は、発泡槽１内の温度測定値に基づいて、発泡槽１内の温度が設定温度Ｔ２から目標の設定温度Ｔ３への設定値の直線に沿うように、制御弁１４ｃの弁開度を調節し、これにより、ジャケット部２への蒸気供給量が調節される。このような蒸気供給量の調節により、発泡槽１内の温度を目標の設定温度Ｔ３に到達させることができる（発泡槽１の内温上昇速度：傾きＳ３）。 Furthermore, after the temperature in the foaming tank 1 reaches the set temperature T2, at a predetermined timing, the pressure reducing valve pressure control unit 22 sets the pressure of the steam flowing through the supply pipe 11d to a set pressure P3 lower than the set pressure P2. The pressure reducing valve 15 is controlled as follows. The temperature indication controller (TIC) adjusts the valve opening degree of the control valve 14d so that the temperature in the foaming tank 1 reaches the set temperature T3 from the set temperature T2. By adjusting the control valve 14d, the amount of steam supplied to the jacket portion 2 is adjusted. At this time, the pressure of the steam supplied to the jacket section 2 becomes a set pressure P3 lower than the set pressure P2, so the speed of steam supply to the jacket section 2 further decreases. In order to make the temperature in the foaming tank 1 reach the set temperature T3 without overshooting under such a reduced steam supply rate, the temperature indicating controller (TIC) has a temperature indicator that changes the temperature from the set temperature T2 to the set temperature T3. The set value of the temperature in the foaming tank 1 is given as a straight line heading toward . Further, the temperature indication controller (TIC) is configured to adjust the temperature in the foaming tank 1 based on the measured temperature value in the foaming tank 1 so that the temperature in the foaming tank 1 follows a straight line from the set temperature T2 to the target set temperature T3. The valve opening degree of the control valve 14c is adjusted, and thereby the amount of steam supplied to the jacket portion 2 is adjusted. By adjusting the amount of steam supplied in this manner, the temperature inside the foaming tank 1 can be made to reach the target set temperature T3 (rate of increase in internal temperature of the foaming tank 1: slope S3).

このように減圧弁圧力制御部２２は、設定圧力Ｐ１からＰ３へ順に、段階的に蒸気圧が減少するように構成されている。これにより、発泡槽１内の設定温度の傾きをＳ１、Ｓ２、Ｓ２’、およびＳ３を与え、発泡槽１内の温度をＴ１、Ｔ２およびＴ３に３段階で昇温させることができる。それゆえ、本実施形態に係る製造装置によれば、従来の製造装置と比較して、精密にかつ再現性を高めて発泡槽１内の温度を制御することができる。 In this way, the pressure reducing valve pressure control section 22 is configured so that the steam pressure decreases in stages from the set pressure P1 to P3. Thereby, the slope of the set temperature in the foaming tank 1 is given as S1, S2, S2', and S3, and the temperature in the foaming tank 1 can be raised in three steps to T1, T2, and T3. Therefore, according to the manufacturing apparatus according to the present embodiment, the temperature inside the foaming tank 1 can be controlled more precisely and with improved reproducibility compared to conventional manufacturing apparatuses.

また、制御弁１４ｄは、従来公知の制御弁であればよい。制御弁１４ｂおよび１４ｃは、発泡槽１内の温度測定値のデータをフィードバックする構成に限定されない。また、減圧弁圧力制御の変更段数は限定されないし、連続的に変更しても良い。発泡槽１内の設定温度およびその傾きも限定されない。 Further, the control valve 14d may be any conventionally known control valve. The control valves 14b and 14c are not limited to a configuration that feeds back data of the temperature measurement value within the foaming tank 1. Further, the number of change steps in the pressure reducing valve pressure control is not limited, and may be changed continuously. The set temperature in the foaming tank 1 and its slope are also not limited.

また、減圧弁圧力制御部２２は、減圧弁１５を制御するためのものである。それゆえ、減圧弁圧力制御部２２は、減圧弁１５を制御することができる要素または部材で構成されていればよい。例えば、減圧弁圧力制御部２２は、供給管１１ｄの圧力を測定する測定機能と、測定圧力が所定圧力（例えば設定圧力Ｐ１、Ｐ２またはＰ３）を超える、あるいは下回ったときに供給管１１ｄの圧力を前記所定圧力に制御する制御機能と、供給管１１ｄの圧力が前記所定圧力に到達したことを使用者に通知する通知機能と、を備えた構成であってもよい。 Further, the pressure reducing valve pressure control section 22 is for controlling the pressure reducing valve 15. Therefore, the pressure reducing valve pressure control section 22 only needs to be composed of an element or member that can control the pressure reducing valve 15. For example, the pressure reducing valve pressure control unit 22 has a measurement function of measuring the pressure of the supply pipe 11d, and a function of measuring the pressure of the supply pipe 11d when the measured pressure exceeds or falls below a predetermined pressure (for example, set pressure P1, P2, or P3). The configuration may include a control function to control the pressure to the predetermined pressure, and a notification function to notify the user that the pressure of the supply pipe 11d has reached the predetermined pressure.

また、減圧弁圧力制御部２２は、集積回路（ＩＣチップ）等に形成された論理回路（ハードウェア）によって実現してもよいし、ＣＰＵ（Central Processing Unit）を用いてソフトウェアによって実現してもよい。このような減圧弁圧力制御部２２を備えたことによって、減圧弁１５の自動制御を実現することができる。 Further, the pressure reducing valve pressure control section 22 may be realized by a logic circuit (hardware) formed on an integrated circuit (IC chip) or the like, or may be realized by software using a CPU (Central Processing Unit). good. By providing such a pressure reducing valve pressure control section 22, automatic control of the pressure reducing valve 15 can be realized.

この場合、本実施形態に係る製造装置は、各機能を実現するソフトウェアであるプログラムの命令を実行するＣＰＵ、上記プログラムおよび各種データがコンピュータ（またはＣＰＵ）で読み取り可能に記録されたＲＯＭ（Read Only Memory）または記憶装置（これらを「記録媒体」と称する）、上記プログラムを展開するＲＡＭ（Random Access Memory）などを備えている。そして、コンピュータ（またはＣＰＵ）が上記プログラムを上記記録媒体から読み取って実行することにより、本開示の目的が達成される。上記記録媒体としては、「一時的でない有形の媒体」、例えば、テープ、ディスク、カード、半導体メモリ、プログラマブルな論理回路などを用いることができる。また、上記プログラムは、該プログラムを伝送可能な任意の伝送媒体（通信ネットワークや放送波等）を介して上記コンピュータに供給されてもよい。なお、本発明は、上記プログラムが電子的な伝送によって具現化された、搬送波に埋め込まれたデータ信号の形態でも実現され得る。 In this case, the manufacturing apparatus according to the present embodiment includes a CPU that executes instructions of a program that is software that implements each function, a ROM (Read Only memory) or a storage device (these are referred to as a "recording medium"), a RAM (Random Access Memory) for expanding the above program, and the like. Then, the object of the present disclosure is achieved by the computer (or CPU) reading the program from the recording medium and executing it. As the recording medium, a "non-temporary tangible medium" such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, etc. can be used. Furthermore, the program may be supplied to the computer via any transmission medium (communication network, broadcast waves, etc.) that can transmit the program. Note that the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

供給管１１ｄの蒸気供給量を規定する呼び径は、図３に示される構成に限定されず、発泡槽１の寸法または発泡工程中の発泡槽１内の温度制御に応じて適宜設定可能である。 The nominal diameter that defines the steam supply amount of the supply pipe 11d is not limited to the configuration shown in FIG. 3, and can be set as appropriate depending on the dimensions of the foaming tank 1 or the temperature control inside the foaming tank 1 during the foaming process. .

本発明は上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。 The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. are also included within the technical scope of the present invention.

〔まとめ〕
本発明の態様１に係る発泡粒子の製造装置は、発泡槽１と、前記発泡槽１の外周部に設けられたジャケット部２と、前記ジャケット部２へ蒸気を供給する供給管１１を有し、前記発泡槽１内の温度を調節する温調制御部１０と、を備え、前記温調制御部１０は、前記ジャケット部２へ供給される蒸気の圧力を一定に保つ第１の減圧弁（減圧弁１２）と、前記第１の減圧弁の下流側から分岐し、蒸気供給量が互いに異なる複数の分岐管１１ａ～１１ｃと、前記複数の分岐管１１ａ～１１ｃの開閉切替を制御するための切替制御部（開閉弁切替制御部２１）と、前記複数の分岐管１１ａ～１１ｃの少なくとも１つに設けられ、当該分岐管での蒸気量を調節する第１の制御弁（制御弁１４ｂおよび１４ｃ）と、を備えた構成である。 〔summary〕
The expanded particle manufacturing apparatus according to aspect 1 of the present invention includes a foaming tank 1, a jacket section 2 provided on the outer periphery of the foaming tank 1, and a supply pipe 11 for supplying steam to the jacket section 2. , a temperature control section 10 that adjusts the temperature inside the foaming tank 1, and the temperature control section 10 includes a first pressure reducing valve ( a pressure reducing valve 12), a plurality of branch pipes 11a to 11c branching from the downstream side of the first pressure reducing valve and having mutually different steam supply amounts, and a system for controlling opening/closing switching of the plurality of branch pipes 11a to 11c. A switching control section (on-off valve switching control section 21), a first control valve (control valves 14b and 14c) that is provided in at least one of the plurality of branch pipes 11a to 11c and that adjusts the amount of steam in the branch pipe. ).

また、本発明の態様２に係る発泡粒子の製造装置は、態様１において、蒸気供給量が最も大きい分岐管１１ａには、前記第１の制御弁が設けられていない構成である。 Furthermore, the expanded particle manufacturing apparatus according to the second aspect of the present invention has a configuration in which the first control valve is not provided in the branch pipe 11a that supplies the largest amount of steam in the first aspect.

また、本発明の態様３に係る発泡粒子の製造装置は、態様１または２において、前記切替制御部（開閉弁切替制御部２１）は、蒸気供給量が最も大きい分岐管１１ａから蒸気供給量が最も小さい分岐管１１ｃへ順に、開閉を切替えるように構成されている構成である。 Further, in the expanded particle manufacturing apparatus according to aspect 3 of the present invention, in aspect 1 or 2, the switching control section (on-off valve switching control section 21) controls the amount of steam supplied from the branch pipe 11a having the largest amount of steam supplied. This configuration is configured to switch opening and closing in order to the smallest branch pipe 11c.

本発明の態様４に係る発泡粒子の製造装置は、発泡槽１と、前記発泡槽１の外周部に設けられたジャケット部２と、前記ジャケット部２へ蒸気を供給する供給管１１ｄを有し、前記発泡槽内の温度を調節する温調制御部１０Ａと、を備え、前記温調制御部１０Ａは、前記供給管１１ｄに設けられ、上流側の蒸気供給源から送られる蒸気の圧力を減圧して、下流側へ送る第２の減圧弁（減圧弁１５）と、前記供給管１１ｄにおける前記第２の減圧弁の下流側に設けられ、前記ジャケット部２への蒸気流量を調節する第２の制御弁（制御弁１４ｄ）と、前記第２の減圧弁を制御し、前記供給管を流れる蒸気の圧力を上昇または降下させる減圧弁圧力制御部２２と、を備えた構成である。 The expanded particle manufacturing apparatus according to aspect 4 of the present invention includes a foaming tank 1, a jacket section 2 provided on the outer periphery of the foaming tank 1, and a supply pipe 11d for supplying steam to the jacket section 2. , a temperature control control section 10A that adjusts the temperature in the foaming tank, and the temperature control control section 10A is provided in the supply pipe 11d and reduces the pressure of steam sent from an upstream steam supply source. and a second pressure reducing valve (pressure reducing valve 15) for sending the steam to the downstream side, and a second pressure reducing valve that is provided downstream of the second pressure reducing valve in the supply pipe 11d and that adjusts the flow rate of steam to the jacket section 2. (control valve 14d), and a pressure reducing valve pressure control section 22 that controls the second pressure reducing valve and increases or decreases the pressure of the steam flowing through the supply pipe.

本発明の態様５に係る発泡粒子の製造方法は、発泡槽１と、前記発泡槽１の外周部に設けられたジャケット部２と、前記ジャケット部２へ蒸気を供給する供給管１１を有し、前記発泡槽１内の温度を調節する温調制御部１０と、を備え、前記温調制御部１０は、前記ジャケット部２へ供給される蒸気の圧力を一定に保つ第１の減圧弁（減圧弁１２）と、前記第１の減圧弁の下流側から分岐し、蒸気供給量が互いに異なる複数の分岐管１１ａ～１１ｃと、前記複数の分岐管１１ａ～１１ｃの少なくとも１つに設けられた第１の制御弁（制御弁１４ｂおよび１４ｃ）と、を備えた製造装置を用いた発泡粒子の製造方法において、前記複数の分岐管１１ａ～１１ｃの開閉切替を制御するとともに、当該分岐管１１ｂおよび１１ｃでの蒸気量を前記第１の制御弁により調節する。 A method for manufacturing expanded particles according to aspect 5 of the present invention includes a foaming tank 1, a jacket part 2 provided on the outer periphery of the foaming tank 1, and a supply pipe 11 for supplying steam to the jacket part 2. , a temperature control section 10 that adjusts the temperature inside the foaming tank 1, and the temperature control section 10 includes a first pressure reducing valve ( A pressure reducing valve 12), a plurality of branch pipes 11a to 11c branching from the downstream side of the first pressure reducing valve and having mutually different steam supply amounts, and a plurality of branch pipes 11a to 11c provided in at least one of the plurality of branch pipes 11a to 11c. In a method for manufacturing expanded particles using a manufacturing apparatus equipped with a first control valve (control valves 14b and 14c), opening and closing switching of the plurality of branch pipes 11a to 11c is controlled, and the branch pipes 11b and 14c are controlled to open and close. The amount of steam at 11c is adjusted by the first control valve.

本発明の態様６に係る発泡粒子の製造方法は、発泡槽１と、前記発泡槽１の外周部に設けられたジャケット部２と、前記ジャケット部２へ蒸気を供給する供給管１１ｄを有し、前記発泡槽１内の温度を調節する温調制御部１０Ａと、を備え、前記温調制御部１０Ａは、前記供給管１１ｄに設けられ、上流側の蒸気供給源から送られる蒸気の圧力を減圧して、下流側へ送る第２の減圧弁（減圧弁１５）と、前記供給管１１ｄにおける前記第２の減圧弁の下流側に設けられた第２の制御弁と、を備えた製造装置を用いた発泡粒子の製造方法において、前記第２の減圧弁を制御し、前記供給管１１ｄを流れる蒸気の圧力を上昇または降下させるとともに、前記ジャケット部２への蒸気流量を前記第２の制御弁により調節する。 A method for manufacturing expanded particles according to aspect 6 of the present invention includes a foaming tank 1, a jacket part 2 provided on the outer periphery of the foaming tank 1, and a supply pipe 11d for supplying steam to the jacket part 2. , a temperature control section 10A that adjusts the temperature inside the foaming tank 1, and the temperature control section 10A is provided in the supply pipe 11d and controls the pressure of the steam sent from the upstream steam supply source. A manufacturing device comprising a second pressure reducing valve (pressure reducing valve 15) that reduces the pressure and sends it to the downstream side, and a second control valve provided on the downstream side of the second pressure reducing valve in the supply pipe 11d. In the method for manufacturing expanded particles using the method, the second pressure reducing valve is controlled to increase or decrease the pressure of the steam flowing through the supply pipe 11d, and the flow rate of steam to the jacket part 2 is controlled by the second control. Adjusted by valve.

１ 発泡槽
２ ジャケット部
１０、１０Ａ 温調制御部
１１、１１ｄ 供給管
１１ａ、１１ｂ、１１ｃ 分岐管
１２ 減圧弁（第１の減圧弁）
１５ 減圧弁（第２の減圧弁）
１３ａ、１３ｂ、１３ｃ、１３ｄ 開閉弁
１４ｂ、１４ｃ 制御弁（第１の制御弁）
１４ｄ 制御弁（第２の制御弁）
２１ 開閉弁切替制御部（切替制御部）
２２ 減圧弁圧力制御部 1 Foaming tank 2 Jacket section 10, 10A Temperature control section 11, 11d Supply pipe 11a, 11b, 11c Branch pipe 12 Pressure reducing valve (first pressure reducing valve)
15 Pressure reducing valve (second pressure reducing valve)
13a, 13b, 13c, 13d On-off valve 14b, 14c Control valve (first control valve)
14d Control valve (second control valve)
21 Open/close valve switching control section (switching control section)
22 Pressure reducing valve pressure control section

Claims (4)

発泡槽と、
前記発泡槽の外周部に設けられたジャケット部と、
前記ジャケット部へ蒸気を供給する供給管を有し、前記発泡槽内の温度を調節する温調制御部と、を備え、
前記温調制御部は、
上流側の蒸気供給源から送られる高圧蒸気の圧力を最適圧力に減圧する弁であって、前記ジャケット部へ供給される蒸気の圧力を一定に保つ第１の減圧弁と、
前記第１の減圧弁の下流側から分岐し、蒸気供給量が互いに異なる複数の分岐管と、
前記複数の分岐管の開閉切替を制御するための切替制御部と、
前記複数の分岐管の少なくとも１つに設けられ、当該分岐管での蒸気量を調節する第１の制御弁と、を備え、
前記複数の分岐管は、口径が異なる第１～第３の分岐管から構成され、これら分岐管の口径は、第１の分岐管＞第２の分岐管＞第３の分岐管であり、
前記第１の制御弁は、前記第１の分岐管に設けられておらず、
前記切替制御部は、
（１）前記第１の分岐管のみを開放して前記発泡槽の昇温をスタートし、
（２）前記発泡槽内の温度が第１の設定温度に到達した後、前記第２の分岐管のみを開放し、
（３）前記発泡槽内の温度が第１の設定温度から第２の設定温度に到達した後、第３の分岐管のみを開放し、前記発泡槽内の温度を目標の第３の設定温度に到達させる、発泡粒子の製造装置。 A foaming tank,
a jacket part provided on the outer periphery of the foaming tank;
a temperature control section that has a supply pipe that supplies steam to the jacket section and adjusts the temperature within the foaming tank;
The temperature control section includes:
a first pressure reducing valve that reduces the pressure of high-pressure steam sent from an upstream steam supply source to an optimal pressure, and maintains a constant pressure of the steam supplied to the jacket portion;
a plurality of branch pipes that branch from the downstream side of the first pressure reducing valve and have mutually different steam supply amounts;
a switching control unit for controlling opening/closing switching of the plurality of branch pipes;
a first control valve that is provided in at least one of the plurality of branch pipes and adjusts the amount of steam in the branch pipe ;
The plurality of branch pipes are composed of first to third branch pipes having different diameters, and the diameters of these branch pipes are first branch pipe>second branch pipe>third branch pipe,
The first control valve is not provided in the first branch pipe,
The switching control section includes:
(1) Start raising the temperature of the foaming tank by opening only the first branch pipe,
(2) After the temperature in the foaming tank reaches the first set temperature, only the second branch pipe is opened;
(3) After the temperature in the foaming tank reaches the second set temperature from the first set temperature, only the third branch pipe is opened, and the temperature in the foaming tank is adjusted to the target third set temperature. A device for producing expanded particles that achieves 発泡槽と、
前記発泡槽の外周部に設けられたジャケット部と、
前記ジャケット部へ蒸気を供給する供給管を有し、前記発泡槽内の温度を調節する温調制御部と、を備え、
前記温調制御部は、
前記供給管に設けられ、上流側の蒸気供給源から送られる蒸気の圧力を減圧して、下流側へ送る第２の減圧弁と、
前記供給管における前記第２の減圧弁の下流側に設けられ、前記ジャケット部への蒸気流量を調節する第２の制御弁と、
前記第２の減圧弁を制御し、前記供給管を流れる蒸気の圧力を上昇または降下させることにより、ジャケット部への蒸気の供給速度を変化させる減圧弁圧力制御部と、を備えた、発泡粒子の製造装置。 A foaming tank,
a jacket part provided on the outer periphery of the foaming tank;
a temperature control section that has a supply pipe that supplies steam to the jacket section and adjusts the temperature within the foaming tank;
The temperature control section includes:
a second pressure reducing valve provided in the supply pipe to reduce the pressure of steam sent from an upstream steam supply source and send it to the downstream side;
a second control valve that is provided downstream of the second pressure reducing valve in the supply pipe and adjusts the flow rate of steam to the jacket part;
a pressure reducing valve pressure control section that controls the second pressure reducing valve and increases or decreases the pressure of the steam flowing through the supply pipe to change the supply speed of steam to the jacket section. manufacturing equipment. 発泡槽と、
前記発泡槽の外周部に設けられたジャケット部と、
前記ジャケット部へ蒸気を供給する供給管を有し、前記発泡槽内の温度を調節する温調制御部と、を備え、
前記温調制御部は、
上流側の蒸気供給源から送られる高圧蒸気の圧力を最適圧力に減圧する弁であって、前記ジャケット部へ供給される蒸気の圧力を一定に保つ第１の減圧弁と、
前記第１の減圧弁の下流側から分岐し、蒸気供給量が互いに異なる複数の分岐管と、
前記複数の分岐管の少なくとも１つに設けられた第１の制御弁と、を備えた製造装置を用いた発泡粒子の製造方法において、
前記複数の分岐管の開閉切替を制御するとともに、当該分岐管での蒸気量を前記第１の制御弁により調節し、
前記複数の分岐管は、口径が異なる第１～第３の分岐管から構成され、これら分岐管の口径は、第１の分岐管＞第２の分岐管＞第３の分岐管であり、
前記第１の制御弁は、前記第１の分岐管に設けられておらず、
前記開閉切替の制御において、
（１）前記第１の分岐管のみを開放して前記発泡槽の昇温をスタートし、
（２）前記発泡槽内の温度が第１の設定温度に到達した後、前記第２の分岐管のみを開放し、
（３）前記発泡槽内の温度が第１の設定温度から第２の設定温度に到達した後、第３の分岐管のみを開放し、前記発泡槽内の温度を目標の第３の設定温度に到達させる、発泡粒子の製造方法。 A foaming tank,
a jacket part provided on the outer periphery of the foaming tank;
a temperature control section that has a supply pipe that supplies steam to the jacket section and adjusts the temperature within the foaming tank;
The temperature control section includes:
a first pressure reducing valve that reduces the pressure of high-pressure steam sent from an upstream steam supply source to an optimal pressure, and maintains a constant pressure of the steam supplied to the jacket portion;
a plurality of branch pipes that branch from the downstream side of the first pressure reducing valve and have mutually different steam supply amounts;
a first control valve provided in at least one of the plurality of branch pipes;
controlling the opening and closing switching of the plurality of branch pipes, and adjusting the amount of steam in the branch pipes by the first control valve;
The plurality of branch pipes are composed of first to third branch pipes having different diameters, and the diameters of these branch pipes are first branch pipe>second branch pipe>third branch pipe,
The first control valve is not provided in the first branch pipe,
In the control of the opening/closing switching,
(1) Start raising the temperature of the foaming tank by opening only the first branch pipe,
(2) After the temperature in the foaming tank reaches the first set temperature, only the second branch pipe is opened;
(3) After the temperature in the foaming tank reaches the second set temperature from the first set temperature, only the third branch pipe is opened, and the temperature in the foaming tank is adjusted to the target third set temperature. A method for producing expanded particles that achieves . 発泡槽と、
前記発泡槽の外周部に設けられたジャケット部と、
前記ジャケット部へ蒸気を供給する供給管を有し、前記発泡槽内の温度を調節する温調制御部と、を備え、
前記温調制御部は、
前記供給管に設けられ、上流側の蒸気供給源から送られる蒸気の圧力を減圧して、下流側へ送る第２の減圧弁と、
前記供給管における前記第２の減圧弁の下流側に設けられた第２の制御弁と、を備えた製造装置を用いた発泡粒子の製造方法において、
前記第２の減圧弁を制御し、前記供給管を流れる蒸気の圧力を上昇または降下させることにより、ジャケット部への蒸気の供給速度を変化させるとともに、前記ジャケット部への蒸気流量を前記第２の制御弁により調節する、発泡粒子の製造方法。 A foaming tank,
a jacket part provided on the outer periphery of the foaming tank;
a temperature control section that has a supply pipe that supplies steam to the jacket section and adjusts the temperature within the foaming tank;
The temperature control section includes:
a second pressure reducing valve provided in the supply pipe to reduce the pressure of steam sent from an upstream steam supply source and send it to the downstream side;
a second control valve provided downstream of the second pressure reducing valve in the supply pipe;
By controlling the second pressure reducing valve and increasing or decreasing the pressure of the steam flowing through the supply pipe, the supply speed of steam to the jacket section is changed, and the flow rate of steam to the jacket section is increased or decreased by increasing or decreasing the pressure of the steam flowing through the supply pipe. A method for producing expanded particles, which is controlled by a control valve.
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