JP6087228B2 - Manufacturing method of foam molded article - Google Patents
Manufacturing method of foam molded article Download PDFInfo
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- JP6087228B2 JP6087228B2 JP2013140628A JP2013140628A JP6087228B2 JP 6087228 B2 JP6087228 B2 JP 6087228B2 JP 2013140628 A JP2013140628 A JP 2013140628A JP 2013140628 A JP2013140628 A JP 2013140628A JP 6087228 B2 JP6087228 B2 JP 6087228B2
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Description
本発明は、発泡成形品の製造方法に関し、詳しくは、ポリオールを主とするポリウレタンフォーム原料に炭酸ガスを混入して発泡する低密度発泡工法において、ポリウレタン原料の炭酸ガス溶存濃度を測定する工程に関するものである。 The present invention relates to a method for producing a foam-molded article, and more particularly, to a process for measuring the concentration of carbon dioxide dissolved in a polyurethane raw material in a low-density foaming method in which carbon foam is mixed into a polyurethane foam raw material mainly composed of polyol and foamed. Is.
従来、溶存炭酸ガス濃度表示機は、浴槽内または炭酸水製造装置で生成された炭酸水の溶存炭酸ガス濃度を測定表示するもの（特開２０１２−２３７６８９号公報）、溶存ガスを減圧により析出して、析出した溶存ガスの体積により、溶存ガス濃度を計測するものがある（特開２０１２−２３７６９０号公報）。これらは、溶存ガスを直接析出して、析出した溶存ガスにより、溶存ガス濃度を計測するものである。
ところで、車両用シートを構成するパッド材は、一例として、低密度発泡工法により製造されており、この低密度発泡工法では、ポリウレタンフォーム原料内に、発泡ガスとしての炭酸ガスを強制混入させて、炭酸ガスの膨張力を利用しながら発泡させ、ポリウレタンフォームが製造されている。
Conventionally, a dissolved carbon dioxide concentration indicator is a device that measures and displays the dissolved carbon dioxide concentration in carbonated water generated in a bath or a carbonated water production apparatus (Japanese Patent Laid-Open No. 2012-237789), and deposits dissolved gas under reduced pressure. In some cases, the dissolved gas concentration is measured based on the volume of the precipitated dissolved gas (Japanese Patent Laid-Open No. 2012-237690). In these methods, dissolved gas is directly deposited, and the dissolved gas concentration is measured by the deposited dissolved gas.
By the way, the pad material constituting the vehicle seat is manufactured by a low density foaming method as an example, and in this low density foaming method, carbon dioxide as foaming gas is forcibly mixed in the polyurethane foam raw material, Polyurethane foam is produced by foaming while utilizing the expansion force of carbon dioxide gas.
このように、従来の技術では、ポリウレタンフォーム原料内に、炭酸ガスを強制混入させて、炭酸ガスの膨張力を利用しながら発泡させ、発泡成形品であるポリウレタンフォームが製造されているが、炭酸ガスの溶存濃度を管理しないと、発泡倍率が変化し、製品管理、製品の大きさなどに影響し、初期目的の製品で製造できない。炭酸ガスである発泡ガスの溶存濃度管理ができれば、安定的に発泡倍率が管理でき、発泡成形品は目的通りの体積膨張にすることができ好適である。 As described above, in the conventional technology, a polyurethane foam, which is a foam-molded product, is produced by forcibly mixing carbon dioxide gas into a polyurethane foam raw material and foaming it using the expansion force of the carbon dioxide gas. If the dissolved concentration of gas is not managed, the expansion ratio changes, which affects product management, product size, etc., and cannot be manufactured with the initial product. If the dissolved concentration of the foaming gas, which is carbon dioxide gas, can be controlled, the foaming ratio can be controlled stably, and the foamed molded article can be suitably expanded in volume as desired.
本発明は、発泡ガスの溶存濃度管理ができ、安定的に発泡倍率が管理できる発泡成形品の製造方法を提供することを目的とする。 An object of this invention is to provide the manufacturing method of the foaming molded product which can manage the dissolved density | concentration of foaming gas and can manage foaming ratio stably.
かかる目的を達成すべく、本発明に係る発泡成形品の製造方法は、炭酸ガスからなる発泡ガスが混入されたポリウレタンフォーム原料から、発泡成形品を形成する発泡成形品の製造方法において、
ポリウレタンフォーム原料内に液化した状態の炭酸ガスが混入される工程と、炭酸ガスが混入されたポリウレタンフォーム原料を炭酸ガスが気化される圧力まで減圧できる減圧容器内に取り入れる工程と、前記減圧容器内の減圧による炭酸ガスの気化により泡化したポリウレタンフォーム原料の体積膨張率を測定することにより、混入された炭酸ガスの濃度を検出する工程を備えたことを特徴とする。
In order to achieve this object, a method for producing a foam molded article according to the present invention is a method for producing a foam molded article from a polyurethane foam raw material mixed with a foaming gas comprising carbon dioxide gas .
A step of carbon dioxide a liquefied state into the polyurethane foam in the raw material Ru is mixed, a step of Ru incorporated vacuum vessel a polyurethane foam raw material carbon dioxide gas is mixed can be depressurized to a pressure carbon dioxide is vaporized, the vacuum container It is characterized by comprising a step of detecting the concentration of the mixed carbon dioxide gas by measuring the volume expansion coefficient of the polyurethane foam raw material foamed by vaporizing the carbon dioxide gas by the reduced pressure inside .
かかる発泡成形品の製造方法では、発泡ガスが溶存するポリウレタンフォーム原料には、主としてポリオールが含まれており、その粘度が２０℃で５００乃至２０００（ｃｐｓ）で、このポリオールを含むポリウレタンフォーム原料を減圧容器内に取り入れると、減圧された発泡ガスが気化しようとし、その時に、ポリウレタンフォーム原料自体が泡化して体積が膨張する。この泡の体積膨張率を測定することにより、ポリウレタンフォーム原料の溶存発泡ガス濃度が測定でき、発泡ガスの溶存濃度管理ができて安定的に発泡倍率が管理できるので、発泡成形品を目的通りの体積膨張にすることができる。 In such a method for producing a foamed molded product, the polyurethane foam raw material in which the foaming gas is dissolved mainly contains a polyol, and the viscosity thereof is 500 to 2000 (cps) at 20 ° C. When taken into the decompression vessel, the decompressed foaming gas tends to vaporize, and at that time, the polyurethane foam raw material itself foams and the volume expands. By measuring the volume expansion rate of the foam, the dissolved foaming gas concentration of the polyurethane foam raw material can be measured, the dissolved gas concentration can be controlled, and the foaming ratio can be controlled stably. Volume expansion can be achieved.
前記発泡ガスは炭酸ガスであることが好ましい。炭酸ガスであれば、オゾン層保護や地球温暖化防止の環境保護の点から好適である The foaming gas is preferably carbon dioxide. Carbon dioxide gas is suitable for protecting the ozone layer and protecting the environment from global warming.
本発明によれば、発泡ガスの溶存濃度管理ができ、安定的に発泡倍率が管理できる発泡成形品の製造方法が得られる。 ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the foaming molded product which can manage the dissolved density | concentration of foaming gas and can manage foaming ratio stably is obtained.
本発明の一実施形態につき、図1乃至図３に基づき説明する。
本発明に係る発泡成形品の製造方法は、図１に示すように、ポリオールを主とするポリウレタンフォーム原料内に発泡ガスとして炭酸ガスを混入して発泡する低密度発泡工法の場合につき説明する。
An embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the method for producing a foamed molded product according to the present invention will be described in the case of a low density foaming method in which carbon foam is mixed as a foaming gas into a polyurethane foam raw material mainly composed of polyol and foamed.
ポリオールを主とするポリウレタンフォーム原料１は、原料用タンク２内に注入され、炭酸ガス用タンク３から炭酸ガスが混入されるミキシング用タンク４に炭酸ガスとともに原料用タンク２からポリウレタンフォーム原料が注入される。炭酸ガスが混入したポリウレタンフォーム原料はブレンド用タンク５内に注入され、別ルートからの添加剤などが注入されている別タンク６との素材とミキシングされて製品素材となる。 Polyurethane foam raw material 1 mainly composed of polyol is injected into raw material tank 2, and polyurethane foam raw material is injected from raw material tank 2 together with carbon dioxide into mixing tank 4 where carbon dioxide gas is mixed from carbon dioxide gas tank 3. Is done. The polyurethane foam raw material mixed with carbon dioxide gas is injected into the blending tank 5 and mixed with a material with another tank 6 into which additives from another route are injected to become a product material.
溶存炭酸ガス濃度検出器１０は、図２、３に示すように、ブレンド用タンク５からのポリウレタンフォーム原料を取り入れて、ポリウレタンフォーム原料を減圧できる減圧用測定器である減圧用タンク７に設けられている。減圧用タンク７は、ブレンド用タンク５内よりもその圧力が減圧、例えば５０％減圧されており、ブレンド用タンク５からのポリウレタンフォーム原料は、主として粘度が２０℃で５００乃至２０００（ｃｐｓ）のポリオールを含むので、減圧により炭酸ガスが気化しようとする。この時、ポリウレタンフォーム原料に粘度があるので、泡化して体積が膨張する。溶存炭酸ガス濃度検出器１０は、この泡化して体積が膨張するので、体積膨張度合いを非接触式のレベルセンサー８用いて、既定の高さまで膨張する時間を測定することにより、ポリウレタンフォーム原料内の溶存炭酸ガス濃度を測定する。そして、この炭酸ガス濃度が規定値を超えたり、規定値に達しない場合には、警報音により作業者に警告し、規定値となるべく、炭酸ガス用タンク３から炭酸ガスが混入されるミキシング用タンク４への炭酸ガス濃度を調整する。 As shown in FIGS. 2 and 3, the dissolved carbon dioxide concentration detector 10 is provided in a decompression tank 7 which is a measuring instrument for decompression that can take in the polyurethane foam material from the blending tank 5 and depressurize the polyurethane foam material. ing. The pressure reduction tank 7 has a pressure lower than that in the blending tank 5, for example, 50%, and the polyurethane foam raw material from the blending tank 5 mainly has a viscosity of 500 to 2000 (cps) at 20 ° C. Since it contains a polyol, carbon dioxide tends to vaporize under reduced pressure. At this time, since the polyurethane foam raw material has viscosity, it foams and the volume expands. Since the dissolved carbon dioxide concentration detector 10 foams and expands its volume, the volume expansion degree is measured by using a non-contact type level sensor 8 to measure the time during which the volume expands to a predetermined height. Measure the concentration of dissolved carbon dioxide. When the carbon dioxide concentration exceeds the specified value or does not reach the specified value, the operator is warned with an audible alarm, and the mixing gas in which the carbon dioxide gas is mixed from the carbon dioxide gas tank 3 to reach the specified value. The carbon dioxide gas concentration to the tank 4 is adjusted.
その結果、ポリウレタンフォーム原料内の溶存炭酸ガス濃度を随時測定することができるので、ミキシング用タンク４への炭酸ガスの混入量の調節ができ、初期目的のポリウレタンフォームが製造できる。すなわち、安定的に発泡倍率が管理できる発泡成形品が得られる。
この溶存炭酸ガス濃度検出器１０は、図３に示すように、ポリウレタンフォーム原料に粘度があるので、泡化して体積が膨張するという特性を利用して、体積膨張度合いを非接触式のレベルセンサー８を用いて、既定の高さまで膨張する時間を測定することにより、ポリウレタンフォーム原料内の溶存炭酸ガス濃度を測定することができるので、溶存ガス濃度の測定が簡単である。しかも、非接触式レベルセンサー８より、溶存炭酸ガス濃度が測定できるので、溶存炭酸ガス濃度検出器１０の構造が簡単化でき、安価な溶存炭酸ガス濃度検出器１０により、発泡倍率が管理できる発泡成形品が得られる。
As a result, since the dissolved carbon dioxide concentration in the polyurethane foam raw material can be measured at any time, the amount of carbon dioxide mixed into the mixing tank 4 can be adjusted, and the initial purpose polyurethane foam can be produced. That is, it is possible to obtain a foamed molded product that can stably manage the foaming ratio.
As shown in FIG. 3, the dissolved carbon dioxide concentration detector 10 uses a characteristic that the polyurethane foam raw material has a viscosity, so that the volume expands due to foaming, and the degree of volume expansion is a non-contact type level sensor. Since the concentration of dissolved carbon dioxide in the polyurethane foam raw material can be measured by measuring the time of expansion to a predetermined height using 8, the measurement of the dissolved gas concentration is simple. In addition, since the dissolved carbon dioxide concentration can be measured by the non-contact type level sensor 8, the structure of the dissolved carbon dioxide concentration detector 10 can be simplified, and the foaming ratio can be controlled by the inexpensive dissolved carbon dioxide concentration detector 10. A molded product is obtained.
上記では溶存炭酸ガス濃度検出器１０は溶存炭酸ガス濃度を測定する場合につき説明しているが、この溶存炭酸ガス濃度検出器１０の溶存炭酸ガス濃度により、ミキシング用タンク４への炭酸ガスの混入量の調節ができるように、制御装置９に接続することができることは言うまでもない。
また、発泡ガスとして炭酸ガスを用いた場合につき説明したが、発泡ガスは炭酸ガスに限られるものではない。
In the above, the case where the dissolved carbon dioxide concentration detector 10 measures the dissolved carbon dioxide concentration has been described, but the mixing of the carbon dioxide gas into the mixing tank 4 by the dissolved carbon dioxide concentration of the dissolved carbon dioxide concentration detector 10. It goes without saying that it can be connected to the control device 9 so that the amount can be adjusted.
Moreover, although the case where carbon dioxide gas was used as foaming gas was demonstrated, foaming gas is not restricted to carbon dioxide gas.
１０は溶存炭酸ガス濃度検出器である。
Reference numeral 10 denotes a dissolved carbon dioxide concentration detector.
Claims (1)
ポリウレタンフォーム原料内に液化した状態の炭酸ガスが混入される工程と、炭酸ガスが混入されたポリウレタンフォーム原料を炭酸ガスが気化される圧力まで減圧できる減圧容器内に取り入れる工程と、前記減圧容器内の減圧による炭酸ガスの気化により泡化したポリウレタンフォーム原料の体積膨張率を測定することにより、混入された炭酸ガスの濃度を検出する工程を備えたことを特徴とする発泡成形品の製造方法。 From the polyurethane foam raw material mixed with the foaming gas consisting of carbon dioxide gas , in the foam molded product manufacturing method for forming the foam molded product,
A step of carbon dioxide a liquefied state into the polyurethane foam in the raw material Ru is mixed, a step of Ru incorporated vacuum vessel a polyurethane foam raw material carbon dioxide gas is mixed can be depressurized to a pressure carbon dioxide is vaporized, the vacuum container A method for producing a foam molded article comprising a step of detecting the concentration of mixed carbon dioxide gas by measuring a volume expansion coefficient of a polyurethane foam raw material foamed by vaporization of carbon dioxide gas under reduced pressure inside .
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| JP2013140628A JP6087228B2 (en) | 2013-07-04 | 2013-07-04 | Manufacturing method of foam molded article |
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| JP2013140628A JP6087228B2 (en) | 2013-07-04 | 2013-07-04 | Manufacturing method of foam molded article |
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| JP2015013931A JP2015013931A (en) | 2015-01-22 |
| JP6087228B2 true JP6087228B2 (en) | 2017-03-01 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05247164A (en) * | 1992-02-28 | 1993-09-24 | Mitsui Toatsu Chem Inc | Production of low-density soft polyurethane foam |
| JP3383949B2 (en) * | 1994-12-06 | 2003-03-10 | 京都電子工業株式会社 | Measurement method of dissolved gas amount of fluid |
| JP4119233B2 (en) * | 2002-12-10 | 2008-07-16 | 東洋ゴム工業株式会社 | Method for producing fine cell resin foam |
| JP2006124579A (en) * | 2004-10-29 | 2006-05-18 | Inoac Corp | Polyurethane foam and method for producing the same |
| JP2006321969A (en) * | 2005-04-20 | 2006-11-30 | Toray Ind Inc | Method for molding polyurethane foam |
| US20120145955A1 (en) * | 2009-07-27 | 2012-06-14 | Arkema Inc. | COMPOSITION OF HCFO-1233zd AND POLYOL BLENDS FOR USE IN POLYURETHANE FOAM |
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