JP6028910B2 - Nozzle tip - Google Patents
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- JP6028910B2 JP6028910B2 JP2012194712A JP2012194712A JP6028910B2 JP 6028910 B2 JP6028910 B2 JP 6028910B2 JP 2012194712 A JP2012194712 A JP 2012194712A JP 2012194712 A JP2012194712 A JP 2012194712A JP 6028910 B2 JP6028910 B2 JP 6028910B2
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Description
本発明は、塗装対象物に塗料組成物を噴き付けるためのスプレーガンのノズルチップに関し、特に分散媒の少なくとも一部を超臨界状態の二酸化炭素で代替した、塗料組成物に適したノズルチップに関するものである。 The present invention relates to a nozzle tip of a spray gun for spraying a coating composition onto a coating object, and more particularly to a nozzle tip suitable for a coating composition in which at least a part of a dispersion medium is replaced with carbon dioxide in a supercritical state. Is.
スプレーガンを用いて塗装を行うには、塗料の基材となる高分子化合物を溶解する有機溶媒を分散媒として用いたり、水を分散媒とした塗料組成物のエマルションを用いたりするのが一般的である。これに対し、例えば特許文献１および２には、超臨界状態の二酸化炭素を、分散媒または希釈溶剤の一部または全部として用いる、二酸化炭素塗装方法が開示されている。 In order to perform coating using a spray gun, it is common to use an organic solvent that dissolves the polymer compound that is the base material of the paint as a dispersion medium, or an emulsion of a paint composition that uses water as the dispersion medium. Is. On the other hand, for example, Patent Documents 1 and 2 disclose a carbon dioxide coating method using supercritical carbon dioxide as a part or all of a dispersion medium or a diluent solvent.
これによれば、ＶＯＣ発生を大幅に抑えることができる低環境負荷型の塗装方法であり、エアスプレー法やエアレススプレー法では困難な薄膜かつ平滑性の高い塗膜を形成できるとしている。 According to this, it is said that it is a low environmental load type coating method which can suppress VOC generation | occurrence | production significantly, and can form the thin film and highly smooth coating film which are difficult with the air spray method or the airless spray method.
そして、二酸化炭素塗装方法では、超臨界状態を得るために、例えば７〜１５ＭＰａの高圧噴霧が必要で、さらに高品質な塗膜を得るために例えば１５〜５０ｇ／ｍｉｎの微少な質量流量を安定して維持する必要があるため、エアレスタイプの高圧噴霧ノズルが使用される。噴霧圧力、噴霧流量、噴霧パターンの最終的な制御は、このノズルに装着されるノズルチップの開口径（相当径）とその形状に依存するため、ノズルチップの開口部の形状を維持することは極めて重要である。 In the carbon dioxide coating method, high pressure spraying of, for example, 7 to 15 MPa is necessary to obtain a supercritical state, and a small mass flow rate of, for example, 15 to 50 g / min is stabilized to obtain a high-quality coating film. Therefore, an airless type high pressure spray nozzle is used. Since the final control of the spray pressure, spray flow rate, and spray pattern depends on the nozzle tip opening diameter (equivalent diameter) and the shape of the nozzle tip attached to this nozzle, it is not possible to maintain the shape of the nozzle tip opening. Very important.
図４は、エアレススプレーなどで用いる、従来の高圧塗装用ノズルチップの一例の内側の形状を示す図で、図４（ａ）は、側面の断面、図４（ｂ）は正面図である。図４に示した例は、導入流路から設けられた溝の先端２０とノズルチップ前面より設ける溝底部２１が交差して流路２２が形成される。上記ノズルチップ構造において、導入流路からの高圧液流は先端の流路２２に向かって流れて衝突し、扇状膜となって高速で噴射され微細な粒子となって塗装対象物に塗料を付着させる。 4A and 4B are diagrams showing an inner shape of an example of a conventional nozzle tip for high-pressure coating used in airless spraying, etc. FIG. 4A is a side cross-sectional view, and FIG. 4B is a front view. In the example shown in FIG. 4, the flow path 22 is formed by intersecting the groove tip 20 provided from the introduction flow path and the groove bottom 21 provided from the front surface of the nozzle chip. In the nozzle tip structure, the high-pressure liquid flow from the introduction flow channel flows toward and collides with the flow channel 22 at the tip, becomes a fan-like film, and is sprayed at high speed to form fine particles and attach the paint to the object to be coated. Let
前記公知のノズルチップを高圧二酸化炭素塗装方法のような高圧かつ微少流量を噴射する塗装方法に適用する場合、以下のような現象が発生する。つまり、ノズルチップの流路の縁２３が鋭く尖る構造であるため、流路の縁２３の摩耗が急速に進行し流路２２が拡がる。この現象が発生すると、高圧二酸化炭素塗装方法において、高品質な塗膜を得るのに不可欠である微少流量を安定して維持することができないため、塗装品質を安定して保てないという課題がある。 When the known nozzle tip is applied to a coating method for spraying a high pressure and a minute flow rate such as a high pressure carbon dioxide coating method, the following phenomenon occurs. That is, since the edge 23 of the flow path of the nozzle tip is sharply pointed, the wear of the flow path edge 23 rapidly proceeds and the flow path 22 expands. When this phenomenon occurs, in the high-pressure carbon dioxide coating method, the minute flow rate that is indispensable for obtaining a high-quality coating film cannot be stably maintained. is there.
従って、本発明の課題は、高圧を要する塗装方法、例えば高圧かつ微少流量での噴射を必要とする高圧二酸化炭素塗装方法において、塗装品質を安定して保つ塗装用ガンのノズルチップを提供することである。 Accordingly, an object of the present invention is to provide a nozzle tip for a coating gun that keeps the coating quality stable in a coating method that requires high pressure, for example, a high-pressure carbon dioxide coating method that requires high-pressure injection at a minute flow rate. It is.
本発明は、前記課題に鑑み、前記流路の縁の摩耗に対処する方法を、鋭意検討した結果なされたものである。 This invention is made | formed as a result of earnestly examining the method of dealing with the abrasion of the edge of the said flow path in view of the said subject.
即ち、本発明は、塗料組成物が流出する流路が、前記塗料組成物の出口側から形成されてなる溝の底部と、前記塗料組成物の導入流路側から形成されてなる有底孔の先端とが重なる部分によって形成されてなる、塗装対象物に前記塗料組成物を付着させるための塗装用ガンのノズルチップであって、前記流路は、塗料の流出方向の長さが０．００１ｍｍ〜０．０５０ｍｍであり、前記流路の塗料の流出方向と直交する最小断面は、面積が直径が０．０３ｍｍ〜０．２０ｍｍの円と同等であり、短軸長さと長軸長さとの比が１：１〜１：３０であることを特徴とするノズルチップである。 That is, according to the present invention, the flow path through which the coating composition flows out is the bottom of the groove formed from the outlet side of the coating composition and the bottomed hole formed from the introduction flow path side of the coating composition. A nozzle tip of a coating gun for adhering the coating composition to a coating object formed by a portion overlapping with a tip, wherein the flow path has a length of 0.001 mm in the outflow direction of the coating. The minimum cross-section perpendicular to the flow direction of the paint in the flow path is equivalent to a circle having an area of 0.03 mm to 0.20 mm in diameter, and the ratio of the short axis length to the long axis length Is a nozzle tip characterized by being 1: 1 to 1:30.
また、本発明は、前記有底孔の形状が塗料の流出方向に狭まる溝であることを特徴とする、前記のノズルチップである。 Further, the present invention provides the nozzle tip as described above, wherein the shape of the bottomed hole is a groove that narrows in the outflow direction of the paint.
また、本発明は、前記有底孔の形状が角柱または円柱の少なくともいずれかであることを特徴とする、前記のノズルチップである Further, the present invention provides the nozzle tip as described above, wherein the shape of the bottomed hole is at least one of a prism or a cylinder.
本発明によれば、塗料組成物の出口側から形成されてなる溝の底部と、前記塗料組成物の導入流路側から形成されてなる有底孔の先端とが、重なる部分によって形成されてなる流路の塗料流出方向の長さが０．００１ｍｍ〜０．０５０ｍｍの範囲内で制御され、前記流路の塗料の流出方向と直交する最小断面積が直径０．０３ｍｍ〜０．２０ｍｍの円と同等の面積に制御されることによって、微少流量を安定して維持できる。さらに、望ましい噴霧パターンを得るために、前記流路の最小断面の短軸長さと長軸長さの比が、１：１〜１：３０に制御される。これにより二酸化炭素塗装方法の特徴である薄膜でありながら表面が極めて平滑性の高い塗膜を安定して得ることができる。 According to the present invention, the bottom part of the groove formed from the outlet side of the coating composition and the tip of the bottomed hole formed from the introduction channel side of the coating composition are formed by overlapping portions. The length of the flow direction of the paint in the flow path is controlled within a range of 0.001 mm to 0.050 mm, and the minimum cross-sectional area orthogonal to the flow direction of the paint in the flow path is a circle having a diameter of 0.03 mm to 0.20 mm. By controlling to the same area, a minute flow rate can be stably maintained. Furthermore, in order to obtain a desired spray pattern, the ratio of the short axis length to the long axis length of the minimum cross section of the flow path is controlled to 1: 1 to 1:30. This makes it possible to stably obtain a coating film having a very smooth surface while being a thin film that is a feature of the carbon dioxide coating method.
図３は、本発明の実施の形態に係る塗装設備の一例を模式的に示した図である。図３において、１３は塗料組成物タンク、１４は二酸化炭素ボンベ、１５塗料組成物用ポンプ、１６は二酸化炭素用ポンプ、１７は混合装置、１８は噴霧ガン、１９は塗装対象物である。この図に示した装置は、高圧二酸化炭素塗装装置であって、高圧で二酸化炭素と塗料組成物を均一に混合できる混合機１７を備え、二酸化炭素と塗料の混合を、例えば６〜１０ＭＰａの範囲で十分な二酸化炭素溶解量を保ちながら、一相状態を保持して行うことが可能で、かつ一相状態を保持しつつ、噴霧ノズルに供給できる。 FIG. 3 is a diagram schematically showing an example of a painting facility according to the embodiment of the present invention. In FIG. 3, 13 is a coating composition tank, 14 is a carbon dioxide cylinder, 15 is a coating composition pump, 16 is a carbon dioxide pump, 17 is a mixing device, 18 is a spray gun, and 19 is a coating object. The apparatus shown in this figure is a high-pressure carbon dioxide coating apparatus, and includes a mixer 17 that can uniformly mix carbon dioxide and a coating composition at a high pressure. Thus, it is possible to carry out while maintaining a one-phase state while maintaining a sufficient amount of dissolved carbon dioxide, and to supply to the spray nozzle while maintaining a one-phase state.
図１は本発明に係るノズルチップの一例を示す図で、図１（ａ）は側面の断面図、図１（ｂ）は正面図である。この例は、塗料組成物の導入流路側と、塗料組成物の出口側の両方から溝を形成した例である。 1A and 1B are diagrams showing an example of a nozzle chip according to the present invention. FIG. 1A is a side sectional view and FIG. 1B is a front view. In this example, grooves are formed from both the introduction flow path side of the coating composition and the outlet side of the coating composition.
このノズルチップは、スプレーガンなどに予め設けられたノズルチップホルダーに嵌合、装着して使用される。ノズルチップの導入流路の溝の先端１とノズルチップ前面より設ける溝底部２が交差して形成される流路の縁３に微細な追加工を施すことで、塗料流出方向に長さ４、つまり図１にｔ１なる寸法を示した部分が形成される。 This nozzle tip is used by fitting and mounting on a nozzle tip holder provided in advance in a spray gun or the like. By applying a fine additional process to the edge 3 of the flow path formed by intersecting the groove tip 2 provided from the nozzle chip front surface and the groove tip 2 of the nozzle chip introduction flow path, the length 4 in the paint outflow direction is obtained. That is, a portion having a dimension t 1 in FIG. 1 is formed.
ノズルチップの導入流路の溝の先端１とノズルチップ前面より設ける溝底部２が交差して形成される流路の塗料流出方向の長さｔ１は０．００１ｍｍ〜０．０５０ｍｍの範囲内で高精度に制御される。さらに、微少流量を得るために前記流路の塗料の流出方向と直交する最小断面５の投影面積Ｓは直径０．０３ｍｍ〜０．２０ｍｍの円と同等の面積に制御される。この投影面積Ｓは、ノズルチップの導入流路の溝の先端１とノズルチップ前面より設ける溝底部２が交差して形成される流路の縁３に微細な追加工を施すことで形成される塗料流出方向の長さ４により安定に維持され、よって微少流量を維持できる。さらに、望ましい噴霧パターンを得るために、前記流路の塗料の流出方向と直交する最小断面５の投影面短軸長さＡと長袖長さＢの比が、１：１〜１：３０に制御される。これにより二酸化炭素塗装方法の特徴である薄膜でありながら表面が極めて平滑性の高い塗膜を安定して得ることができる。 The length t 1 in the paint outflow direction of the flow path formed by intersecting the groove tip 2 of the nozzle chip introduction flow path and the groove bottom 2 provided from the front surface of the nozzle chip is in the range of 0.001 mm to 0.050 mm. It is controlled with high accuracy. Further, in order to obtain a minute flow rate, the projected area S of the minimum cross section 5 orthogonal to the flow direction of the paint in the flow path is controlled to an area equivalent to a circle having a diameter of 0.03 mm to 0.20 mm. The projected area S is formed by performing a fine additional process on the edge 3 of the flow path formed by intersecting the groove tip portion 1 provided from the front surface of the nozzle chip and the groove tip 2 of the nozzle chip introduction flow path. It is stably maintained by the length 4 in the paint outflow direction, so that a minute flow rate can be maintained. Further, in order to obtain a desired spray pattern, the ratio of the short-axis length A and the long-sleeve length B of the minimum cross section 5 orthogonal to the flow direction of the paint in the flow path is controlled to 1: 1 to 1:30. Is done. This makes it possible to stably obtain a coating film having a very smooth surface while being a thin film that is a feature of the carbon dioxide coating method.
図２は、本発明に係るノズルチップの他の例を示す図で、図２（ａ）は側面の断面図、図２（ｂ）は正面図である。この例は、塗料組成物の導入流路側に円柱形状の有底孔を設けた例で、ノズルチップの導入流路の溝の先端７とノズルチップ前面より設ける溝８が交差して形成される流路の縁９に微細な追加工を施すことで、塗料流出方向に長さ１０、つまり図１にｔ２なる寸法を示した部分が形成される。 2A and 2B are diagrams showing another example of the nozzle tip according to the present invention. FIG. 2A is a side sectional view, and FIG. 2B is a front view. This example is an example in which a cylindrical bottomed hole is provided on the introduction flow path side of the coating composition, and the tip 7 of the groove of the introduction flow path of the nozzle tip and the groove 8 provided from the front surface of the nozzle chip are formed to intersect. By applying a minute additional process to the edge 9 of the flow path, a length 10 in the paint outflow direction, that is, a portion having a dimension of t 2 in FIG. 1 is formed.
ノズルチップの導入流路の溝の先端７とノズルチップ前面より設ける溝８が交差して形成される流路の塗料流出方向の長さｔ２は０．００１ｍｍ〜０．０５０ｍｍの範囲内で高精度に制御される。さらに、微少流量を得るために前記流路の塗料の流出方向と直交する最小断面１１の投影面積Ｓは直径０．０３ｍｍ〜０．２０ｍｍの円と同等の面積に制御される。この投影面積Ｓは、ノズルチップの導入流路の溝の先端７とノズルチップ前面より設ける溝８が交差して形成される流路の縁９に微細な追加工を施すことで形成される塗料流出方向の長さ１０により安定に維持され、よって微少流量を維持できる。さらに、望ましい噴霧パターンを得るために、前記流路の塗料の流出方向と直交する最小断面１１の投影面短軸長さＡと長袖長さＢの比が、１：１〜１：３０に制御される。これにより二酸化炭素塗装方法の特徴である薄膜でありながら表面が極めて平滑性の高い塗膜を安定して得ることができる。 The length t 2 in the paint outflow direction of the flow path formed by intersecting the groove tip 8 of the nozzle chip introduction flow path and the groove 8 provided from the front surface of the nozzle chip is high within a range of 0.001 mm to 0.050 mm. Controlled with precision. Further, in order to obtain a minute flow rate, the projected area S of the minimum cross section 11 orthogonal to the paint outflow direction of the flow path is controlled to an area equivalent to a circle having a diameter of 0.03 mm to 0.20 mm. This projected area S is a coating formed by applying a fine additional process to the edge 9 of the flow path formed by intersecting the groove 7 provided from the front surface of the nozzle chip and the groove tip 7 of the nozzle chip introduction flow path. It is stably maintained by the length 10 in the outflow direction, so that a minute flow rate can be maintained. Further, in order to obtain a desired spray pattern, the ratio of the short axis length A and the long sleeve length B of the minimum cross section 11 perpendicular to the flow direction of the paint in the flow path is controlled to 1: 1 to 1:30. Is done. This makes it possible to stably obtain a coating film having a very smooth surface while being a thin film that is a feature of the carbon dioxide coating method.
以上に説明したように、本発明によれば、二酸化炭素塗装方法の適したノズルチップを提供することができ、品質の高い塗膜を安定的に得ることができる。なお、本発明は、以上の実施形態に限定されるものではなく、その特徴事項から逸脱することなく、他のいろいろな形態で実施することができる。そのため、前述の実施の形態はあらゆる点て単なる例示に過ぎず、限定的に解釈されてはならない。本発明の範囲は、特許請求の範囲によって示すものであって、明細書本文には、何ら拘束されない。さらに、特許請求の範囲の均等範囲に属する変形や変更は、すべて本発明の範囲内のものである。 As described above, according to the present invention, a nozzle tip suitable for a carbon dioxide coating method can be provided, and a high-quality coating film can be stably obtained. In addition, this invention is not limited to the above embodiment, It can implement with other various forms, without deviating from the characteristic matter. For this reason, the above-described embodiment is merely an example in all respects, and should not be interpreted in a limited manner. The scope of the present invention is shown by the scope of claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.
１，２０ ・・・導入流路の溝の先端 ２，８，２１ ・・・ ノズルチップ前面より設ける溝
３，６，２３ ・・・ 流路の縁 ５，１１，２２ ・・・ 流路
１３ ・・・ 塗料組成物タンク １４ ・・・ 二酸化炭素ボンベ
１５ ・・・ 塗料組成物用ポンプ １６ ・・・ 二酸化炭素用ポンプ
１７ ・・・ 混合装置 １８ ・・・ 噴霧ガン １９ ・・・ 塗装対象物
1, 20 ... Leading edge of groove of introduction flow path 2, 8, 21 ... Groove 3, 6, 23 provided from front surface of nozzle chip ... Edge of flow path 5, 11, 22 ... Flow path 13 ... Coating composition tank 14 ... Carbon dioxide cylinder 15 ... Coating composition pump 16 ... Carbon dioxide pump 17 ... Mixing device 18 ... Spray gun 19 ... Painting object
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| JP2012194712A JP6028910B2 (en) | 2012-09-05 | 2012-09-05 | Nozzle tip |
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| JP2012194712A JP6028910B2 (en) | 2012-09-05 | 2012-09-05 | Nozzle tip |
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| JP6028910B2 true JP6028910B2 (en) | 2016-11-24 |
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| JP5913712B1 (en) * | 2015-10-06 | 2016-04-27 | 昭和電工ガスプロダクツ株式会社 | Painting equipment |
| JP5898367B1 (en) * | 2015-10-06 | 2016-04-06 | 昭和電工ガスプロダクツ株式会社 | Painting equipment |
| JP5913713B1 (en) * | 2015-10-06 | 2016-04-27 | 昭和電工ガスプロダクツ株式会社 | Painting equipment |
| JP6006448B1 (en) * | 2016-03-28 | 2016-10-12 | 長瀬産業株式会社 | Painting equipment |
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| JPS585711B2 (en) * | 1979-06-06 | 1983-02-01 | 旭ダイヤモンド工業株式会社 | Ultra-high pressure liquid jet nozzle for drilling or cutting |
| JP3801778B2 (en) * | 1998-05-20 | 2006-07-26 | 株式会社いけうち | spray nozzle |
| JP5608864B2 (en) * | 2010-10-19 | 2014-10-15 | 独立行政法人産業技術総合研究所 | Carbon dioxide coating method and apparatus |
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