JP2015071489A - Conveyer belt - Google Patents
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Abstract
Description
本発明は、コンベヤベルトに関し、更に詳しくは、上面カバーゴム層と下面カバーゴム層との厚さの違いに起因するカッピングを防止することを可能にしたコンベヤベルトに関する。 The present invention relates to a conveyor belt, and more particularly, to a conveyor belt that can prevent cupping due to a difference in thickness between an upper cover rubber layer and a lower cover rubber layer.
芯体補強層の上下にカバーゴム層を積層した一般的なコンベヤベルトでは、搬送物が載置される上面カバーゴム層は、搬送物の投下、積載、搬送の繰り返しによって摩耗することを考慮して層厚が設定されている。これに伴い、ベルトコンベヤ装置の支持ローラに当接する下面カバーゴム層よりも上面カバーゴム層は厚くなっている（例えば、特許文献１を参照）。 In a general conveyor belt in which cover rubber layers are laminated on the top and bottom of the core reinforcing layer, the top cover rubber layer on which the transported material is placed is considered to wear due to repeated dropping, loading, and transporting of the transported material. The layer thickness is set. Accordingly, the upper cover rubber layer is thicker than the lower cover rubber layer in contact with the support roller of the belt conveyor device (see, for example, Patent Document 1).
そのため、プレス加硫後、コンベヤベルトが外気に触れて冷える際に、ゴム量の多い上面カバーゴム層の収縮量が、下面カバーゴム層の収縮量よりも大きくなり、コンベヤベルト幅方向両端部が上向きになるような反りが生じる所謂カッピングが生じることがある。 Therefore, after press vulcanization, when the conveyor belt cools down by touching the outside air, the shrinkage amount of the upper cover rubber layer with a large amount of rubber becomes larger than the shrinkage amount of the lower cover rubber layer, and both ends in the conveyor belt width direction are So-called cupping may occur that causes warping to be upward.
このカッピングが生じると、外観品質が低下し、また、ベルトコンベヤ装置に装着した際に、付属設備に干渉する等の不具合に発展することもある。 When this cupping occurs, the quality of the appearance deteriorates, and when it is attached to the belt conveyor device, it may develop into a problem such as interference with the attached equipment.
本発明の目的は、上面カバーゴム層と下面カバーゴム層との厚さの違いに起因するカッピングを防止することを可能にしたコンベヤベルトを提供することにある。 An object of the present invention is to provide a conveyor belt capable of preventing cupping due to a difference in thickness between an upper cover rubber layer and a lower cover rubber layer.
上記目的を達成するための本発明のコンベヤベルトは、下面カバーゴム層と該下面カバーゴム層よりも厚い上面カバーゴム層との間に芯体補強層を積層したコンベヤベルトにおいて、前記芯体補強層の幅方向両外側に配置された耳ゴム部の密度が、前記上面カバーゴム層及び前記下面カバーゴム層を構成するゴムの密度よりも高く設定されていることを特徴とする。 In order to achieve the above object, the conveyor belt of the present invention is a conveyor belt in which a core reinforcing layer is laminated between a lower cover rubber layer and an upper cover rubber layer thicker than the lower cover rubber layer. The density of the ear rubber portions arranged on both outer sides in the width direction of the layer is set to be higher than the density of the rubber constituting the upper surface cover rubber layer and the lower surface cover rubber layer.
本発明のコンベヤベルトは、耳ゴム部が上面カバーゴム層及び下面カバーゴム層を構成するゴムに比して高密度に設定されているので、上面カバーゴム層が下面カバーゴム層に比して厚くて、加硫後にゴムが冷える際にコンベヤベルト幅方向両端部が上方に反ろうとする動きが生じても、耳ゴム部の重さによって抑制される。これにより、カッピングの発生が防止される。また、高密度のゴムは硬度も高いので、耳ゴム部による芯体補強層の保護効果を期待することができる。更に、コンベヤベルトの幅方向両側が重くなるため、コンベヤベルト走行時の蛇行が防止されて、安定性の向上を期待することができる。 In the conveyor belt of the present invention, the ear rubber part is set at a higher density than the rubber constituting the upper cover rubber layer and the lower cover rubber layer, so the upper cover rubber layer is lower than the lower cover rubber layer. Even when the rubber is cooled after vulcanization and the both ends of the conveyor belt width direction are warped upward, the movement is suppressed by the weight of the ear rubber portion. This prevents the occurrence of cupping. In addition, since the high-density rubber has high hardness, it can be expected that the core reinforcing layer is protected by the ear rubber part. Furthermore, since both sides of the conveyor belt in the width direction become heavy, meandering during traveling of the conveyor belt is prevented, and improvement in stability can be expected.
耳ゴム部の密度は、例えば、２．８ｔｏｎ／ｍ3 〜３．８ｔｏｎ／ｍ3に設定する。これにより、効果的にカッピングを防止することができる。 The density of the ear rubber part is set to, for example, 2.8 ton / m 3 to 3.8 ton / m 3 . Thereby, cupping can be effectively prevented.
耳ゴム部を、フェライトゴムにより構成することもできる。フェライトゴムはフェライト磁石粉末をゴムに混合して得られるので、フェライト磁石粉末の配合量を変えるだけで、容易に密度を調整できる。 The ear rubber part can also be made of ferrite rubber. Since ferrite rubber is obtained by mixing ferrite magnet powder with rubber, the density can be easily adjusted only by changing the blending amount of ferrite magnet powder.
耳ゴム部の幅寸法が、下面カバーゴム層から上面カバーゴム層に向かうにつれて大きくなっている仕様にすることもできる。このように、ゴムの収縮量の大きい上面カバーゴム層側により多くの耳ゴム部が存在するようにすることで、よりカッピングを防止し易くなる。 It is also possible to make the specification that the width dimension of the ear rubber part increases as it goes from the lower cover rubber layer to the upper cover rubber layer. Thus, it becomes easier to prevent cupping by allowing more ear rubber portions to be present on the upper cover rubber layer side where the amount of rubber shrinkage is large.
耳ゴム部の幅寸法は、例えば、５ｍｍ〜１５ｍｍに設定する。この幅寸法の範囲に設定することにより、コストを抑えながらも、芯体補強層を保護しつつ、カッピングを防止することができる。 The width dimension of the ear rubber part is set to 5 mm to 15 mm, for example. By setting the width within this range, cupping can be prevented while the cost is reduced and the core reinforcing layer is protected.
以下、本発明について添付の図面を参照しながら詳細に説明する。 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
図１に例示するように、本発明のコンベヤベルト１は、芯体補強層２を挟んで上下にそれぞれ上面カバーゴム層３、下面カバーゴム層４が配置されている。即ち、上面カバーゴム層３と下面カバーゴム層４との層間にベルト長手方向に延びる芯体補強層２が埋設されている。また、芯体補強層２の幅方向両外側には、ベルト長手方向に延びる耳ゴム部５が配置されている。 As illustrated in FIG. 1, the conveyor belt 1 of the present invention has an upper surface cover rubber layer 3 and a lower surface cover rubber layer 4 disposed above and below with a core reinforcing layer 2 interposed therebetween. That is, the core reinforcing layer 2 extending in the belt longitudinal direction is embedded between the upper cover rubber layer 3 and the lower cover rubber layer 4. Further, ear rubber portions 5 extending in the belt longitudinal direction are arranged on both outer sides in the width direction of the core body reinforcing layer 2.
芯体補強層２は、コンベヤベルト１を張設した際のテンションを負担する心体であり、例えば、帆布等の繊維補強層を複数積層して構成されている。繊維補強層の表面は接着ゴムにより被覆されている。芯体補強層２は、帆布等の繊維補強層に限らず、スチールコード層により構成することもできる。芯体補強層２の材質や積層数はコンベヤベルト１に対する要求性能（剛性、伸び等）により決定される。 The core reinforcing layer 2 is a core that bears the tension when the conveyor belt 1 is stretched, and is configured by, for example, laminating a plurality of fiber reinforcing layers such as canvas. The surface of the fiber reinforcing layer is covered with an adhesive rubber. The core reinforcing layer 2 is not limited to a fiber reinforcing layer such as a canvas, but can also be composed of a steel cord layer. The material and the number of layers of the core reinforcing layer 2 are determined by the required performance (rigidity, elongation, etc.) for the conveyor belt 1.
コンベヤベルト１は、ベルトコンベヤ装置６のプーリの間に張設され、図２に例示するように、支持ローラ７ａ，７ｂ，７ｃにより支持された状態で使用される。図２の実施形態では、中央の支持ローラ７ａは水平に配置され、両側の支持ローラ７ｂ，７ｃは所定の角度で傾斜して配置されている。これら支持ローラ７ａ，７ｂ，７ｃに沿うようにコンベヤベルト１が変形して、ベルト幅方向断面がトラフ形状になるように支持ローラ７ａ，７ｂ，７ｃによって保持される。このようなトラフ形状にすることで、搬送物の積載量を増加させる。 The conveyor belt 1 is stretched between pulleys of the belt conveyor device 6 and is used in a state of being supported by support rollers 7a, 7b, and 7c as illustrated in FIG. In the embodiment of FIG. 2, the central support roller 7a is disposed horizontally, and the support rollers 7b and 7c on both sides are disposed at a predetermined angle. The conveyor belt 1 is deformed along the support rollers 7a, 7b, and 7c, and is held by the support rollers 7a, 7b, and 7c so that the cross section in the belt width direction becomes a trough shape. By using such a trough shape, the load amount of the conveyed product is increased.
上面カバーゴム層３及び下面カバーゴム層４は、例えば、天然ゴムを含むジエン系ゴムからなり、カーボンブラックなどによって耐摩耗性を良好にしたゴム組成物が用いられる。そして、搬送物が積載される上面カバーゴム層３は、搬送物の投下、積載、搬送の繰り返しによって摩耗するため、支持ローラ７ａ，７ｂ，７ｃに当接する下面カバーゴム層４よりも層厚が厚く設定されている。例えば、１．５ｍｍの下面カバーゴム層４の層厚に対して上面カバーゴム層３の層厚が３．０ｍｍ〜５．０ｍｍに設定される。或いは、３．０ｍｍの下面カバーゴム層４の層厚に対して上面カバーゴム層３の層厚が６．０ｍｍに設定される。 The upper cover rubber layer 3 and the lower cover rubber layer 4 are made of, for example, a diene rubber containing natural rubber, and a rubber composition having good wear resistance with carbon black or the like is used. Since the upper cover rubber layer 3 on which the conveyed product is loaded is worn by repeated dropping, loading and conveying of the conveyed product, the layer thickness of the upper cover rubber layer 3 is smaller than that of the lower cover rubber layer 4 contacting the support rollers 7a, 7b and 7c. It is set thick. For example, the layer thickness of the upper cover rubber layer 3 is set to 3.0 mm to 5.0 mm with respect to the layer thickness of the lower cover rubber layer 4 of 1.5 mm. Alternatively, the layer thickness of the upper cover rubber layer 3 is set to 6.0 mm with respect to the layer thickness of the lower cover rubber layer 4 of 3.0 mm.
耳ゴム部５は、芯体補強層２を構成するコード等の端部を保護するためのものであり、上面カバーゴム層３及び下面カバーゴム層４を構成するゴムとは異なる種類のゴムが使用されている。本発明では、この耳ゴム部５の密度が、上面カバーゴム層３及び下面カバーゴム層４を構成するゴムの密度よりも高く設定されている。尚、上面カバーゴム層３及び下面カバーゴム層４を構成するゴムの密度は、通常、０．９ｔｏｎ／ｍ3 〜１．２ｔｏｎ／ｍ3 （９００ｋｇ／ｍ3 〜１２００ｋｇ／ｍ3 ）程度である。換言すると、本発明では耳ゴム部５を上面カバーゴム層３及び下面カバーゴム層４を構成するゴムよりも高比重にしている。 The ear rubber part 5 is for protecting the end part of the cord or the like constituting the core body reinforcing layer 2, and a rubber of a different type from the rubber constituting the upper surface cover rubber layer 3 and the lower surface cover rubber layer 4 is used. It is used. In the present invention, the density of the ear rubber part 5 is set to be higher than the density of the rubber constituting the upper cover rubber layer 3 and the lower cover rubber layer 4. The density of the rubber constituting the upper cover rubber layer 3 and the lower cover rubber layer 4 is usually about 0.9 ton / m 3 to 1.2 ton / m 3 (900 kg / m 3 to 1200 kg / m 3 ). . In other words, in the present invention, the ear rubber part 5 has a higher specific gravity than the rubber constituting the upper cover rubber layer 3 and the lower cover rubber layer 4.
上述のように、上面カバーゴム層３は層厚が厚く設定されているので、従来のコンベヤベルトでは、プレス加硫後、コンベヤベルト１が外気に触れて冷える際に、ゴム量の多い上面カバーゴム層３の収縮量が、下面カバーゴム層４の収縮量よりも大きくなり、コンベヤベルト１の幅方向両端部が上向きになるような反りが生じる所謂カッピングが生じることがある。ところが、本発明のコンベヤベルト１は、耳ゴム部５が上面カバーゴム層３及び下面カバーゴム層４を構成するゴムに比して高密度に設定されているので、上面カバーゴム層３が下面カバーゴム層４に比して厚くて、加硫後にゴムが冷える際に、コンベヤベルト幅方向両端部が上方（上面カバーゴム層３側）に反ろうとする動きが生じても、この動きは耳ゴム部５の重さによって抑制される。これにより、カッピングの発生が防止される。また、高密度のゴムは硬度も高いので、耳ゴム部５による芯体補強層２の保護効果を期待することができる。更に、コンベヤベルト１の幅方向両側が重くなるため、コンベヤベルト１走行時の蛇行が防止されて、安定性の向上を期待することができる。また、コンベヤベルト１の幅方向両側が相対的に重くなるので、走行時の幅方向両端部のバタツキも抑えることができる。 As described above, since the upper cover rubber layer 3 is set to have a large layer thickness, in the conventional conveyor belt, after the press vulcanization, when the conveyor belt 1 is cooled by touching the outside air, the upper cover having a large amount of rubber is used. The shrinkage amount of the rubber layer 3 is larger than the shrinkage amount of the lower surface cover rubber layer 4, and so-called cupping may occur in which warpage occurs such that both end portions in the width direction of the conveyor belt 1 face upward. However, in the conveyor belt 1 of the present invention, the ear rubber part 5 is set at a higher density than the rubber constituting the upper cover rubber layer 3 and the lower cover rubber layer 4, so the upper cover rubber layer 3 is lower surface. It is thicker than the cover rubber layer 4, and when the rubber cools after vulcanization, even if the conveyor belt width direction both ends move upward (upper surface cover rubber layer 3 side), It is suppressed by the weight of the rubber part 5. This prevents the occurrence of cupping. Further, since the high-density rubber has a high hardness, the protection effect of the core reinforcing layer 2 by the ear rubber portion 5 can be expected. Furthermore, since both sides in the width direction of the conveyor belt 1 become heavy, meandering during traveling of the conveyor belt 1 is prevented, and improvement in stability can be expected. Moreover, since the both sides of the width direction of the conveyor belt 1 become relatively heavy, the fluttering of the width direction both ends at the time of driving | running | working can also be suppressed.
本発明は、上面カバーゴム層３の層厚が下面カバーゴム層４の層厚の３倍以上であるコンベヤベルトに好ましく適用される。即ち、このように上面カバーゴム層３と下面カバーゴム層４との層厚の差が大きい場合に、加硫後の上面カバーゴム層３と下面カバーゴム層４との収縮量の差が顕著になり、カッピングが発生し易くなるので、本発明の高密度の耳ゴム部５を適用することで、効果的にカッピングを防止することができる。 The present invention is preferably applied to a conveyor belt in which the layer thickness of the upper cover rubber layer 3 is three times or more the layer thickness of the lower cover rubber layer 4. That is, when the difference in layer thickness between the upper cover rubber layer 3 and the lower cover rubber layer 4 is large, the difference in shrinkage between the upper cover rubber layer 3 and the lower cover rubber layer 4 after vulcanization is significant. Since cupping is likely to occur, cupping can be effectively prevented by applying the high-density ear rubber portion 5 of the present invention.
耳ゴム部５の密度は、例えば、２．８ｔｏｎ／ｍ3 〜３．８ｔｏｎ／ｍ3 （２８００ｋｇ／ｍ3 〜３８００ｋｇ／ｍ3 ）の範囲に設定する。耳ゴム部５の密度が２．８ｔｏｎ／ｍ3 よりも小さいと、耳ゴム部５の重さが不足してコンベヤベルト１の反りを充分に抑制することができず、カッピングを防止する効果が限定的になる。耳ゴム部５の密度が３．８ｔｏｎ／ｍ3 よりも大きいと、コンベヤベルト１が重くなり過ぎるため、コンベヤベルト１を稼働させる際の消費エネルギーが増大する。従って、耳ゴム部５の密度をこの範囲に設定することで、効果的にカッピングを防止することができる。 The density of the ear rubber part 5 is set, for example, in a range of 2.8 ton / m 3 to 3.8 ton / m 3 (2800 kg / m 3 to 3800 kg / m 3 ). If the density of the ear rubber part 5 is smaller than 2.8 ton / m 3, the weight of the ear rubber part 5 is insufficient and the warp of the conveyor belt 1 cannot be sufficiently suppressed, and the effect of preventing cupping is obtained. Become limited. If the density of the ear rubber part 5 is larger than 3.8 ton / m 3 , the conveyor belt 1 becomes too heavy, so that energy consumption when the conveyor belt 1 is operated increases. Therefore, cupping can be effectively prevented by setting the density of the ear rubber portion 5 within this range.
耳ゴム部５の密度を上述の範囲に設定するには、例えば、耳ゴム部５を構成するゴムのポリマー量、カーボン量、オイル量、無機充填剤の種類や配合量等を調整する。 In order to set the density of the ear rubber part 5 within the above-mentioned range, for example, the amount of polymer of the rubber constituting the ear rubber part 5, the amount of carbon, the amount of oil, the kind and blending amount of the inorganic filler are adjusted.
例えば、耳ゴム部５を、フェライト磁石粉末をゴムと混合して得られたフェライトゴムにより構成された仕様にすることもできる。フェライトゴムは、フェライト磁石粉末をゴムに混合して成形するものであるので、フェライト磁石粉末の配合量によって、容易にゴムの密度を調整できる。そのため、カッピング防止には有利になる。フェライトゴムを用いる場合は、比較的少量のフェライト磁石粉末を混合するだけで、耳ゴム部５の密度を、３．６ｔｏｎ／ｍ3 〜３．８ｔｏｎ／ｍ3 の範囲の高い密度にすることができる。 For example, the ear rubber part 5 can be made of a ferrite rubber obtained by mixing ferrite magnet powder with rubber. Since the ferrite rubber is formed by mixing ferrite magnet powder with rubber, the density of the rubber can be easily adjusted by the blending amount of the ferrite magnet powder. This is advantageous for preventing cupping. When using a ferrite rubber is simply to mix the relatively small amount of ferrite magnet powder, the density of the ear rubber portion 5, be a high density in the range of 3.6ton / m 3 ~3.8ton / m 3 it can.
図３に例示するように、耳ゴム部５の幅寸法が、下面カバーゴム層４から上面カバーゴム層３に向かうにつれて大きくなっている仕様にすることもできる。換言すると、耳ゴム部５の横断面形状を、上面カバーゴム層３側が長辺で、下面カバーゴム層４側が短辺である台形状にした仕様にすることができる。このような仕様にすることで、加硫後の収縮の大きい上面カバーゴム層３側により多くの高密度ゴムを配置することができるので、カッピング防止には有利になる。また、全体を同幅にするよりも、下面カバーゴム層４側の量を削減できるので、高密度ゴムの使用量を抑えて、低コスト化を図ることができる。 As illustrated in FIG. 3, the width of the ear rubber part 5 may be increased as it goes from the lower cover rubber layer 4 to the upper cover rubber layer 3. In other words, the cross-sectional shape of the ear rubber part 5 can be a trapezoidal shape in which the upper surface cover rubber layer 3 side has a long side and the lower surface cover rubber layer 4 side has a short side. By adopting such a specification, more high-density rubber can be disposed on the side of the upper cover rubber layer 3 that has a large shrinkage after vulcanization, which is advantageous in preventing cupping. Moreover, since the amount on the lower surface cover rubber layer 4 side can be reduced rather than making the whole width the same, the amount of high-density rubber used can be suppressed and the cost can be reduced.
高密度の耳ゴム部５は低密度のゴムに比して硬度が高く、芯体補強層２の保護性能が優れるので、耳ゴム部５の幅寸法を小さくしても、芯体補強層２を充分に保護することができる。耳ゴム部５の幅寸法は、高コストである高密度ゴムの使用量を抑えるために、例えば、５ｍｍ〜１５ｍｍに設定する。耳ゴム部５の幅寸法が５ｍｍより小さいと、耳ゴム部５がコンベヤベルト１に占める割合が小さくなり、耳ゴム部５の重さが過小になる。それ故、コンベヤベルト１の反りを充分に抑制することができず、カッピングを防止する効果が限定的になる。耳ゴム部５の幅寸法が１５ｍｍより大きいと、耳ゴム部５（高密度ゴム）がコンベヤベルト１に占める割合が大きくなり、コンベヤベルト１の重量が増加する。これに伴い、コンベヤベルト１を稼働させる際の消費エネルギーが増大する。また、高密度ゴムの使用量が増加するためコスト高になる。 Since the high-density ear rubber part 5 has higher hardness than the low-density rubber and the protection performance of the core body reinforcing layer 2 is excellent, even if the width dimension of the ear rubber part 5 is reduced, the core body reinforcing layer 2 Can be sufficiently protected. The width dimension of the ear rubber part 5 is set to, for example, 5 mm to 15 mm in order to suppress the amount of high-density rubber that is expensive. When the width dimension of the ear rubber part 5 is smaller than 5 mm, the ratio of the ear rubber part 5 to the conveyor belt 1 becomes small, and the weight of the ear rubber part 5 becomes too small. Therefore, the warp of the conveyor belt 1 cannot be sufficiently suppressed, and the effect of preventing cupping is limited. When the width dimension of the ear rubber part 5 is larger than 15 mm, the ratio of the ear rubber part 5 (high density rubber) to the conveyor belt 1 increases, and the weight of the conveyor belt 1 increases. Along with this, energy consumption when the conveyor belt 1 is operated increases. In addition, the amount of high-density rubber used increases, resulting in high costs.
１ コンベヤベルト
２ 芯体補強層
３ 上面カバーゴム層
４ 下面カバーゴム層
５ 耳ゴム部
６ ベルトコンベヤ装置
７ａ，７ｂ，７ｃ 支持ローラ
DESCRIPTION OF SYMBOLS 1 Conveyor belt 2 Core body reinforcement layer 3 Upper surface cover rubber layer 4 Lower surface cover rubber layer 5 Ear rubber part 6 Belt conveyor apparatus 7a, 7b, 7c Support roller
Claims (5)
前記芯体補強層の幅方向両外側に配置された耳ゴム部の密度が、前記上面カバーゴム層及び前記下面カバーゴム層を構成するゴムの密度よりも高く設定されていることを特徴とするコンベヤベルト。 In the conveyor belt in which the core reinforcing layer is laminated between the lower cover rubber layer and the upper cover rubber layer thicker than the lower cover rubber layer,
The density of the ear rubber portions arranged on both outer sides in the width direction of the core body reinforcing layer is set to be higher than the density of rubber constituting the upper surface cover rubber layer and the lower surface cover rubber layer. Conveyor belt.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20190122153A (en) * | 2018-04-19 | 2019-10-29 | (주) 화승엑스윌 | Multi-functional composite conveyor belt and manufacturing method thereof |
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| JP2003146417A (en) * | 2001-11-15 | 2003-05-21 | Yokohama Rubber Co Ltd:The | Conveyor belt and manufacturing method of the same |
| US20040140180A1 (en) * | 2001-05-23 | 2004-07-22 | Wolfgang Kerwel | Conveyor belt with plastic covering |
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| JPS468191Y1 (en) * | 1966-11-15 | 1971-03-23 | ||
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| JP2000062927A (en) * | 1998-08-25 | 2000-02-29 | Bando Chem Ind Ltd | Air floating type carrying belt |
| US20040140180A1 (en) * | 2001-05-23 | 2004-07-22 | Wolfgang Kerwel | Conveyor belt with plastic covering |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20190122153A (en) * | 2018-04-19 | 2019-10-29 | (주) 화승엑스윌 | Multi-functional composite conveyor belt and manufacturing method thereof |
| KR102094352B1 (en) * | 2018-04-19 | 2020-03-30 | (주) 화승엑스윌 | Multi-functional composite conveyor belt and manufacturing method thereof |
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| JP6197550B2 (en) | 2017-09-20 |
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