JP2021030440A - Manufacturing method of foamed resin molded products - Google Patents
Manufacturing method of foamed resin molded products Download PDFInfo
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- JP2021030440A JP2021030440A JP2019148376A JP2019148376A JP2021030440A JP 2021030440 A JP2021030440 A JP 2021030440A JP 2019148376 A JP2019148376 A JP 2019148376A JP 2019148376 A JP2019148376 A JP 2019148376A JP 2021030440 A JP2021030440 A JP 2021030440A
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- 239000011347 resin Substances 0.000 title claims abstract description 72
- 229920005989 resin Polymers 0.000 title claims abstract description 72
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 31
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 4
- 238000005187 foaming Methods 0.000 abstract 1
- 210000000497 foam cell Anatomy 0.000 description 8
- 239000011324 bead Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000010097 foam moulding Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
Description
本発明は、表面にスキン層を有する発泡樹脂成形品を一対の金型内において一体的に成形することができる発泡樹脂成形品の製造方法に関するものである。 The present invention relates to a method for producing a foamed resin molded product, which can integrally mold a foamed resin molded product having a skin layer on the surface in a pair of molds.
従来から、発泡樹脂成形品の表面の強度を増加して、耐衝撃性や耐摩擦性等の性能を高めるためにスキン層と称される同一樹脂による硬質層を設けたものが知られている。このような表面にスキン層を有する発泡樹脂成形品は、軽量性、断熱性、防音性等の発泡樹脂製品の優れた特性に加えて、スキン層による表面強度や耐衝撃性や耐摩擦性等の向上を図ることができるため、断熱材や防音材等の建材、精密機械等の保護部材、自動車用の床材やエンジンカバー部材等、種々の用途への適用が図られている。 Conventionally, it has been known that a hard layer made of the same resin called a skin layer is provided in order to increase the surface strength of the foamed resin molded product and enhance the performance such as impact resistance and abrasion resistance. .. Such a foamed resin molded product having a skin layer on the surface has excellent properties of the foamed resin product such as light weight, heat insulation, and soundproofing, as well as surface strength, impact resistance, and friction resistance due to the skin layer. Therefore, it is applied to various applications such as building materials such as heat insulating materials and soundproofing materials, protective members such as precision machinery, flooring materials for automobiles and engine cover members.
しかしながら、従来のスキン層を有する発泡樹脂成形品の製造方法は、発泡樹脂成形品とスキン層を別々に成形しておき、接着剤を介して両者を一体化する方法であった。このため製作に時間がかかるという問題や、また、接着剤を均等に塗布することが難しく接着不良の箇所が生じるという問題もあった。仮に同じ型内でスチーム発泡成形し、更にオイルヒータまたは電熱ヒータによりスキン層をするとしても、加熱昇温時間が極めて長くかかることから、スキン層の厚みが不均一であり均一な厚みの成形品を得ることが難しいとか、スキン層が溶けて陥没しやすい等から、製品として形状が成り立たないという問題があった。 However, the conventional method for producing a foamed resin molded product having a skin layer is a method in which the foamed resin molded product and the skin layer are separately molded and integrated with each other via an adhesive. For this reason, there is a problem that it takes a long time to manufacture, and there is also a problem that it is difficult to apply the adhesive evenly and a portion of poor adhesion occurs. Even if steam foam molding is performed in the same mold and the skin layer is further formed by an oil heater or an electric heater, the heating temperature rise time is extremely long, so that the thickness of the skin layer is uneven and the molded product has a uniform thickness. There was a problem that the shape of the product could not be established because it was difficult to obtain the product and the skin layer was easily melted and depressed.
一方、特許文献１に示されるように、２色射出成型工法を利用して発泡樹脂成形体の表面にスキン層を一体成形する方法が提案されているが、射出成型機を用いるものであり、発泡ビーズ原料を充填後、スチーム加熱により発泡融着して発泡樹脂成形品を製造する発泡樹脂成形品の製造方法とは技術分野を異にするものであった。 On the other hand, as shown in Patent Document 1, a method of integrally molding a skin layer on the surface of a foamed resin molded body by using a two-color injection molding method has been proposed, but it uses an injection molding machine. The technical field was different from the method for producing a foamed resin molded product, in which the foamed bead raw material was filled and then foamed and fused by steam heating to produce a foamed resin molded product.
本発明は上記のような従来の問題点を解決して、表面にスキン層を有する発泡樹脂成形品を金型内において一体的に成形することができる発泡樹脂成形品の製造方法を提供することを目的とするものである。また、電磁誘導加熱を組み合わせてスキン層を生成する新たな製造方法を提供すること、更には、スキン層を任意の厚みに生成することができる発泡樹脂成形品の製造方法を提供することを目的とするものである。 The present invention solves the above-mentioned conventional problems and provides a method for producing a foamed resin molded product capable of integrally molding a foamed resin molded product having a skin layer on the surface in a mold. Is the purpose. Another object of the present invention is to provide a new manufacturing method for forming a skin layer by combining electromagnetic induction heating, and further to provide a manufacturing method for a foamed resin molded product capable of forming a skin layer to an arbitrary thickness. Is to be.
上記課題を解決するためになされた本発明の発泡樹脂成形品の製造方法は、接離自在な一対の金型で形成されるキャビティ内に発泡樹脂原料を充填する工程と、
スチームにより前記金型を加熱する工程と、
更に加熱して原料を発泡融着させ発泡樹脂成形品とする工程と、
次いで、電磁誘導加熱により金型を更に昇温し、この昇温した金型に接している発泡樹脂成形品の表面を溶融してスキン層を生成する工程と、
前記金型を冷却した後に、金型を開いて発泡樹脂成形品を取り出す工程とからなることを特徴とするものであり、これを請求項１に係る発明とする。
The method for producing a foamed resin molded product of the present invention, which has been made to solve the above problems, includes a step of filling a foamed resin raw material into a cavity formed by a pair of molds that can be brought into contact with each other.
The process of heating the mold with steam and
The process of further heating to foam-fuse the raw material into a foamed resin molded product,
Next, a step of further raising the temperature of the mold by electromagnetic induction heating and melting the surface of the foamed resin molded product in contact with the raised mold to form a skin layer.
The invention comprises the step of opening the mold and taking out the foamed resin molded product after cooling the mold, and this is the invention according to claim 1.
好ましい実施形態によれば、スキン層を生成する工程において、スキン層を成形する面の反対側の面から駒金型により発泡樹脂成形品を押圧し、昇温した金型面に押し付けた部位にスキン層を生成するようにしたものが好ましく、これを請求項２に係る発明とする。 According to a preferred embodiment, in the step of forming the skin layer, the foamed resin molded product is pressed by the piece mold from the surface opposite to the surface on which the skin layer is molded, and pressed against the heated mold surface. It is preferable that a skin layer is generated, and this is the invention according to claim 2.
また、その他の好ましい実施形態によれば、生成するスキン層の厚みを、発泡樹脂成形品を押圧する力具合により調整するようにするのが好ましく、これを請求項３に係る発明とする。 Further, according to another preferred embodiment, it is preferable to adjust the thickness of the skin layer to be formed by the force of pressing the foamed resin molded product, which is the invention according to claim 3.
請求項１に係る発明では、接離自在な一対の金型で形成されるキャビティ内に発泡樹脂原料を充填する工程と、スチームにより前記金型を加熱する工程と、に加熱して原料を発泡融着させ発泡樹脂成形品とする工程と、次いで、電磁誘導加熱により金型を更に昇温し、この昇温した金型に接している発泡樹脂成形品の表面を溶融してスキン層を生成する工程と、前記金型を冷却した後に、金型を開いて発泡樹脂を取り出す工程とからなるものとしたので、金型温度を電磁誘導加熱によって短時間に昇温可能となり、表面にスキン層を有する発泡樹脂成形品を一対の金型内において連続的、かつ一体的に成形することができる。 In the invention according to claim 1, the raw material is foamed by heating in a step of filling a foamed resin raw material in a cavity formed by a pair of molds that can be brought into contact with each other and a step of heating the mold with steam. A step of fusing to obtain a foamed resin molded product, and then the mold is further heated by electromagnetic induction heating, and the surface of the foamed resin molded product in contact with the heated mold is melted to form a skin layer. Since the process consists of the process of cooling the mold and the process of opening the mold and taking out the foamed resin, the mold temperature can be raised in a short time by electromagnetic induction heating, and a skin layer is formed on the surface. The foamed resin molded product having the above can be continuously and integrally molded in a pair of molds.
また、請求項２に係る発明では、スキン層を生成する工程において、スキン層を成形する面の反対側の面から駒金型により発泡樹脂成形品を押圧し、昇温した金型面に押し付けた部位にスキン層を生成するようにしたので、表面の発泡ビーズ原料が加熱溶融されてソリッド化するとともに、更に駒金型により押圧されて脱気脱泡し薄くて均一なスキン層を生成することができる。 Further, in the invention according to claim 2, in the step of forming the skin layer, the foamed resin molded product is pressed by the piece mold from the surface opposite to the surface on which the skin layer is molded, and pressed against the heated mold surface. Since the skin layer is formed on the part where the skin is formed, the foamed bead material on the surface is heated and melted to solidify, and is further pressed by the piece mold to degas and defoam to generate a thin and uniform skin layer. be able to.
また、請求項３に係る発明では、生成するスキン層の厚みを、発泡樹脂成形品を押圧する力具合により調整するようにしたので、所望の厚みのスキン層を生成することが可能となり、ニーズに合わせた様々な厚みのスキン層付きの発泡樹脂成形品を提供することができる。 Further, in the invention according to claim 3, since the thickness of the skin layer to be produced is adjusted by the force of pressing the foamed resin molded product, it is possible to generate a skin layer having a desired thickness, which is a need. It is possible to provide a foamed resin molded product with a skin layer having various thicknesses according to the above.
以下に、図面を参照しつつ本発明の好ましい実施の形態を示す。
図１は、本発明の実施に用いる金型の一例を示す概略断面図で、図において、１は接離自在な一対の金型の移動型、２は固定型であり、一般的な発泡成形機と基本構造は同じである。図示のものでは、移動型１に設けられた駒金型１ａと、固定型２に設けられた凹型２ａとでキャビティが形成されており、このキャビティ内に原料充填機３から発泡樹脂原料が充填される構造である。また、前記駒金型１ａは、モータ４の駆動によりシャフト５が下降し凹型２ａ側へ押し込み移動可能となっている。
なお、前記駒金型１ａは凹型２ａの開口部全面を覆うように構成されているが、凹型２ａの開口部の一部のみで押し込み移動する構造とすることもできる。
Hereinafter, preferred embodiments of the present invention will be shown with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an example of a mold used in carrying out the present invention. In the figure, 1 is a movable mold of a pair of molds that can be attached and detached, and 2 is a fixed mold, which is a general foam molding. The basic structure is the same as the machine. In the illustrated one, a cavity is formed by a piece mold 1a provided in the mobile mold 1 and a concave mold 2a provided in the fixed mold 2, and the foamed resin raw material is filled in the cavity from the raw material filling machine 3. It is a structure to be made. Further, in the piece mold 1a, the shaft 5 is lowered by the drive of the motor 4, and the piece mold 1a can be pushed and moved toward the concave mold 2a side.
Although the piece mold 1a is configured to cover the entire opening of the concave mold 2a, it may be configured to be pushed and moved only by a part of the opening of the concave mold 2a.
前記固定型２の下面には、磁性体でないトッププレート６が敷設されており、このトッププレート６の下部には誘導加熱用のコイル７が取り付けられている。このコイル７は、ＩＨ（Induction Heating 誘導加熱）の原理を利用して金型の特定部位を加熱するものである。即ち、図２に示されるように、コイル７に電流が流れると、コイル７を取り巻くように磁力線が発生し、更に、この磁力線により磁性体である凹型２の底面にうず電流と呼ばれる多数の電流が発生する。凹型２の底面にうず電流が流れると、電気抵抗があるためジュール熱が発生して凹型２の底面が急激に加熱されることとなる。この結果、凹型２の底面に接している発泡樹脂成形品の表面が溶融され、スキン層を生成することとなる。なお、図において２０は発泡樹脂成形品、２１は表面に生成されたスキン層である。 A non-magnetic top plate 6 is laid on the lower surface of the fixed mold 2, and a coil 7 for induction heating is attached to the lower portion of the top plate 6. The coil 7 heats a specific part of the mold by utilizing the principle of IH (Induction Heating). That is, as shown in FIG. 2, when a current flows through the coil 7, magnetic field lines are generated so as to surround the coil 7, and further, a large number of currents called eddy currents are generated on the bottom surface of the concave mold 2 which is a magnetic material due to the magnetic field lines. Occurs. When a vortex current flows through the bottom surface of the concave mold 2, Joule heat is generated due to electrical resistance, and the bottom surface of the concave mold 2 is rapidly heated. As a result, the surface of the foamed resin molded product in contact with the bottom surface of the concave mold 2 is melted to form a skin layer. In the figure, 20 is a foamed resin molded product, and 21 is a skin layer formed on the surface.
次に、本発明の製造方法について以下に説明する。
先ず、駒金型１ａと凹型２ａで形成されるキャビティ内に、原料充填機３より発泡樹脂原料を充填した後、駒金型１ａと凹型２ａを覆うチャンバー内に加熱用スチームを投入して前記金型を加熱する。更に加熱を継続して、発泡樹脂原料が膨張するとともに、表面が溶融して隣接する発泡樹脂原料を互いに融着させ、キャビティの内形状に沿った発泡樹脂成形品とする。以上の工程は、従来のスチーム加熱による発泡樹脂成形品の製造方法と基本的に同じである。
Next, the production method of the present invention will be described below.
First, the foamed resin raw material is filled from the raw material filling machine 3 into the cavity formed by the piece mold 1a and the concave mold 2a, and then the heating steam is put into the chamber covering the piece mold 1a and the concave mold 2a. Heat the mold. Further heating is continued, the foamed resin raw material expands, the surface melts, and the adjacent foamed resin raw materials are fused to each other to obtain a foamed resin molded product that follows the inner shape of the cavity. The above steps are basically the same as the conventional method for manufacturing a foamed resin molded product by steam heating.
次いで、コイル７に電流を流して電磁誘導加熱により凹型２の底面を更に昇温する。電磁誘導による加熱では、うず電流の発生により磁性体である金型を急激に昇温することができ、この結果、金型に接している発泡樹脂成形品の表面は発泡樹脂構造が溶けて液状化し、その後、溶融した樹脂は固まって薄いしてスキン層２１を生成することになる。
このように、電磁誘導加熱を利用して短時間に金型温度を上昇して、そこに接触している発泡樹脂成形品の表面にスキン層を形成することは業界において初めての試みであり、本発明の製造方法によってスキン層を有する発泡樹脂成形品を一対の金型内において連続的、かつ一体的に成形可能となった。
Next, an electric current is passed through the coil 7 to further raise the temperature of the bottom surface of the concave mold 2 by electromagnetic induction heating. In heating by electromagnetic induction, the temperature of the mold, which is a magnetic material, can be rapidly raised by the generation of eddy current. As a result, the foamed resin structure is melted and liquid on the surface of the foamed resin molded product in contact with the mold. After that, the molten resin solidifies and becomes thin to form the skin layer 21.
In this way, it is the first attempt in the industry to raise the mold temperature in a short time by using electromagnetic induction heating to form a skin layer on the surface of the foamed resin molded product in contact with the mold temperature. According to the production method of the present invention, a foamed resin molded product having a skin layer can be molded continuously and integrally in a pair of molds.
その後、前記金型を冷却した後に、金型を開いて発泡樹脂成形品２０を取り出し、一連の製造工程は終了するが、この冷却工程と取り出し工程は、従来のスチーム加熱による発泡樹脂成形品の製造方法と基本的に同じである。 After that, after cooling the mold, the mold is opened and the foamed resin molded product 20 is taken out, and a series of manufacturing steps is completed. In this cooling step and taking out step, the foamed resin molded product by conventional steam heating is performed. It is basically the same as the manufacturing method.
前記スキン層２１を生成する工程において、スキン層２１を成形する面の反対側の面から駒金型１ａにより発泡樹脂成形品を押圧し、昇温した金型面に押し付けた部位にスキン層２１を生成するようにするのが好ましい。これにより、電磁誘導加熱で加熱溶融されてソリッド化した発泡ビーズ原料が、駒金型１ａに押圧されて脱気脱泡するので、この結果、薄くて均一なスキン層が生成されることとなる。 In the step of forming the skin layer 21, the foamed resin molded product is pressed by the piece mold 1a from the surface opposite to the surface on which the skin layer 21 is molded, and the skin layer 21 is pressed against the heated mold surface. It is preferable to generate. As a result, the foamed bead raw material that has been heated and melted by electromagnetic induction heating and solidified is pressed by the piece mold 1a to degas and defoam, and as a result, a thin and uniform skin layer is generated. ..
また、生成するスキン層２１の厚みは、発泡樹脂成形品を押圧する駒金型１ａの力具合により調整することが可能であり、駒金型１ａを強く深く押し込めば厚いスキン層２１となり、駒金型１ａを弱く浅く押し込めば薄いスキン層２１となり、発泡樹脂成形品の用途に応じて任意の厚みのスキン層２１を生成することができる。 Further, the thickness of the skin layer 21 to be generated can be adjusted by adjusting the force of the piece mold 1a that presses the foamed resin molded product, and if the piece mold 1a is pushed strongly and deeply, the skin layer 21 becomes thick and the piece becomes a piece. When the mold 1a is pushed in weakly and shallowly, it becomes a thin skin layer 21, and a skin layer 21 having an arbitrary thickness can be generated depending on the use of the foamed resin molded product.
以上の工程を経て成形された発泡樹脂成形品の構造について説明する。
図３は、本発明で得られる発泡樹脂成形品２０の要部を示す拡大断面図であり、表面には薄くて均一なスキン層２１が一体的に形成されている。２２は原料ビーズを発泡した発泡セルであり、隣り合う発泡セル２２、２２の表面同士が溶融接着して結合されているとともに、発泡セル２２、２２・・・の間には三次元連通気孔２３が形成された構造となっている。
The structure of the foamed resin molded product molded through the above steps will be described.
FIG. 3 is an enlarged cross-sectional view showing a main part of the foamed resin molded product 20 obtained in the present invention, in which a thin and uniform skin layer 21 is integrally formed on the surface. Reference numeral 22 denotes a foam cell in which raw material beads are foamed, and the surfaces of adjacent foam cells 22, 22 are melt-bonded and bonded to each other, and three-dimensional continuous ventilation holes 23 are provided between the foam cells 22, 22 ... Has a formed structure.
前記スキン層２１は、電磁誘導加熱により金型を発泡セル２２の融点以上に昇温した際に、金型面に密着している前記発泡セル２２が溶融して生成されるものである。このスキン層２１は、従来技術のように別々に成形したものを接着剤で貼り合わせたものではなく、成形金型内で一連、かつ一体的に生成されるものであり、発泡セル２２が溶けて液状化した状態のものと、液状化に至ってない状態のものとが混在した状態にある中間傾斜層２４を介し、前記スキン層２１と発泡セル２２とが強固に接着一体化した構造となっていると考えられる。
このように、電磁誘導加熱を利用して短時間に金型温度を上昇し、そこに接触している発泡樹脂成形品の表面にスキン層を形成するという技術は、本件発明者が試行錯誤の結果、初めて想到することができたものであり、また、これにより、スキン層を有する発泡樹脂成形品を一対の金型内において連続的、かつ一体的に成形可能となった。
The skin layer 21 is formed by melting the foam cell 22 that is in close contact with the mold surface when the mold is heated to a temperature equal to or higher than the melting point of the foam cell 22 by electromagnetic induction heating. The skin layer 21 is not formed by bonding separately molded ones with an adhesive as in the prior art, but is formed in a series and integrally in a molding die, and the foam cell 22 is melted. The skin layer 21 and the foam cell 22 are firmly adhered and integrated with each other via an intermediate inclined layer 24 in which a liquefied state and a non-liquefied state are mixed. It is thought that it is.
In this way, the technique of raising the mold temperature in a short time by using electromagnetic induction heating and forming a skin layer on the surface of the foamed resin molded product in contact with the mold is developed by the present inventor by trial and error. As a result, it was possible to come up with this for the first time, and this made it possible to continuously and integrally mold a foamed resin molded product having a skin layer in a pair of molds.
以上の説明からも明らかなように、本発明は電磁誘導加熱により金型を昇温し、この昇温した金型に接している発泡樹脂成形品の表面を溶融してスキン層を生成する工程を組み込んだ点に特徴的構成を有するものであり、これにより、表面にスキン層を有する発泡樹脂成形品を金型内において一体的に成形することが可能となり、また、スキン層を任意の厚みに生成することができるという利点もある。 As is clear from the above description, the present invention raises the temperature of the mold by electromagnetic induction heating and melts the surface of the foamed resin molded product in contact with the heated mold to form a skin layer. It has a characteristic structure in that it incorporates the above, which makes it possible to integrally mold a foamed resin molded product having a skin layer on the surface in a mold, and also to make the skin layer an arbitrary thickness. It also has the advantage that it can be generated in.
１ 移動型
１ａ 駒金型
２ 固定型
２ａ 凹型
３ 原料充填機
４ モータ
５ シャフト
６ トッププレート
７ コイル
２０ 発泡樹脂成形品
２１ スキン層
２２ 発泡セル
２３ 三次元連通気孔
２４ 中間傾斜層
1 Mobile type 1a Piece mold 2 Fixed type 2a Concave type 3 Raw material filling machine 4 Motor 5 Shaft 6 Top plate 7 Coil 20 Foam resin molded product 21 Skin layer 22 Foam cell 23 Three-dimensional continuous ventilation hole 24 Intermediate inclined layer
Claims (3)
スチームにより前記金型を加熱する工程と、
更に加熱して原料を発泡融着させ発泡樹脂成形品とする工程と、
次いで、電磁誘導加熱により金型を更に昇温し、この昇温した金型に接している発泡樹脂成形品の表面を溶融してスキン層を生成する工程と、
前記金型を冷却した後に、金型を開いて発泡樹脂成形品を取り出す工程とからなることを特徴とする発泡樹脂成形品の製造方法。 A process of filling a foamed resin raw material into a cavity formed by a pair of molds that can be attached and detached,
The process of heating the mold with steam and
The process of further heating to foam-fuse the raw material into a foamed resin molded product,
Next, a step of further raising the temperature of the mold by electromagnetic induction heating and melting the surface of the foamed resin molded product in contact with the raised mold to form a skin layer.
A method for producing a foamed resin molded product, which comprises a step of opening the mold and taking out the foamed resin molded product after cooling the mold.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11138575A (en) * | 1997-11-06 | 1999-05-25 | Mitsubishi Kagaku Basf Kk | Manufacture of molding with high density skin layer |
| JP2003181866A (en) * | 2001-12-14 | 2003-07-02 | Toho Kogyo Kk | Method for manufacturing foamed molded panel and foamed molded panel manufactured by the same |
| JP2007268916A (en) * | 2006-03-31 | 2007-10-18 | Kaneka Corp | Manufacturing method of resin molded product and roller manufacturing method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11138575A (en) * | 1997-11-06 | 1999-05-25 | Mitsubishi Kagaku Basf Kk | Manufacture of molding with high density skin layer |
| JP2003181866A (en) * | 2001-12-14 | 2003-07-02 | Toho Kogyo Kk | Method for manufacturing foamed molded panel and foamed molded panel manufactured by the same |
| JP2007268916A (en) * | 2006-03-31 | 2007-10-18 | Kaneka Corp | Manufacturing method of resin molded product and roller manufacturing method |
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