JP2017177372A - Producing method of plant fiber reinforced resin - Google Patents

Producing method of plant fiber reinforced resin Download PDF

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JP2017177372A
JP2017177372A JP2016064006A JP2016064006A JP2017177372A JP 2017177372 A JP2017177372 A JP 2017177372A JP 2016064006 A JP2016064006 A JP 2016064006A JP 2016064006 A JP2016064006 A JP 2016064006A JP 2017177372 A JP2017177372 A JP 2017177372A
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resin
additive
fiber reinforced
reinforced resin
vegetable fiber
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JP6544773B2 (en
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晶文 伊藤
Masafumi Ito
晶文 伊藤
淳平 石原
Jumpei ISHIHARA
淳平 石原
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NIPPON PIGMENT CO Ltd
Toyota Auto Body Co Ltd
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NIPPON PIGMENT CO Ltd
Toyota Auto Body Co Ltd
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Priority to PCT/JP2016/083647 priority patent/WO2017168819A1/en
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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
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/40—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft
    • B29B7/42—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with single shaft with screw or helix
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • 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
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives
    • B29B7/90—Fillers or reinforcements, e.g. fibres
    • B29B7/92—Wood chips or wood fibres

Abstract

PROBLEM TO BE SOLVED: To provide plant fiber reinforced resin having a high-quality and a high concentration by realizing mixing at a temperature or less where wood flour is not deteriorated even if a standard mixing machine is used.SOLUTION: The present invention is a producing method for plant fiber reinforced resin, in which a predetermined volume of resin, wood flour of the maximum volume which may be mixed with the resin and an additive of a volume determined based on the volume of the resin and wood flour are supplied to a mixing machine, and mixing is carried out under a state where the resin is melted to produce plant fiber reinforced resin. The resin has a property that it is melted at a temperature lower than a temperature where deterioration of wood flour is initiated. The additive contains first additive having a melting temperature lower than a temperature at which the resin is melted and second additive solidified at a temperature at which the resin is melted. A weight ratio of the resin and the first additive relatively to a total weight is designed at 60% or more.SELECTED DRAWING: Figure 5

Description

本発明は、樹脂と、前記樹脂に対して混練が可能な最大量の木粉と、前記樹脂と木粉との量に応じた添加剤とを混練機に供給し、混練により植物繊維強化樹脂を製造する植物繊維強化樹脂の製造方法に関する。   The present invention supplies a resin, a maximum amount of wood flour that can be kneaded to the resin, and an additive according to the amount of the resin and wood flour to a kneader, and the plant fiber reinforced resin by kneading The present invention relates to a method for producing a plant fiber reinforced resin.

例えば、自動車用の樹脂部品を製造する場合、前記樹脂部品の強度や耐熱性を向上させるため、樹脂に植物繊維、例えば、木粉を加えることが行なわれている。さらに、例えば、エンジンルーム内で使用される樹脂部品等では、燃焼防止や熱による樹脂の劣化防止の観点から樹脂に種々の添加剤が添加されている。樹脂に対して木粉及び添加剤を加える場合には、一般的に、押出混練機が使用される。即ち、押出混練機において樹脂を溶融させた状態で木粉及び添加剤を加え、スクリュー等により混練することが行なわれる。ここで、押出混練機では、規定量の樹脂に対して混練が可能な最大量の木粉を供給し、さらに必要量の添加剤を供給して混練を行なう。   For example, when manufacturing resin parts for automobiles, plant fibers such as wood flour are added to the resin in order to improve the strength and heat resistance of the resin parts. Furthermore, for example, in resin parts and the like used in an engine room, various additives are added to the resin from the viewpoint of preventing combustion and preventing deterioration of the resin due to heat. When adding wood flour and additives to the resin, an extrusion kneader is generally used. That is, wood flour and additives are added in a state where the resin is melted in an extrusion kneader, and kneading is performed using a screw or the like. Here, in the extrusion kneader, the maximum amount of wood flour that can be kneaded is supplied to a specified amount of resin, and the necessary amount of additives is further supplied for kneading.

混練により得られた高濃度の植物繊維強化樹脂はペレットの形状に成形され、後工程で樹脂のペレットと所定比率で混合される。即ち、植物繊維強化樹脂のペレットは樹脂のペレットによって希釈される。そして、樹脂のペレットによって希釈された植物繊維強化樹脂のペレットが射出成形機に供給されて樹脂部品が成形される。このように、押出混練機で高濃度の植物繊維強化樹脂を製造し、後工程で高濃度の植物繊維強化樹脂を樹脂により希釈する方法のため、押出混練機の能力を最大限に利用することができ、低コスト化を図ることができる。   The high-concentration plant fiber reinforced resin obtained by kneading is formed into a pellet shape, and is mixed with the resin pellet at a predetermined ratio in a subsequent step. That is, the vegetable fiber reinforced resin pellets are diluted with resin pellets. Then, the vegetable fiber reinforced resin pellets diluted with the resin pellets are supplied to the injection molding machine to mold the resin parts. In this way, a high-concentration vegetable fiber reinforced resin is produced by an extrusion kneader, and the high-concentration vegetable fiber reinforced resin is diluted with the resin in a subsequent process, so that the ability of the extrusion kneader is utilized to the maximum. Therefore, cost reduction can be achieved.

前記押出混練機において、規定量の樹脂に対して混練が可能な最大量の木粉を供給し、さらに必要量の添加剤を供給して混練を行なう際、溶融している樹脂に対して固形分の重量比率が40％を超えると、混練時に摩擦熱の発生が大きくなり、樹脂温度が混練機の設定温度である200℃を超えて上昇する。樹脂温度が例えば220℃を超えると、木粉が熱による劣化を開始し、樹脂部品の性能低下の原因となる。また、熱によりガスが発生し、植物繊維強化樹脂のペレットが発泡して形状が不均一になり、後工程において樹脂のペレットとの混合が良好に行なえなくなる。この問題を解決するため、特許文献１に記載の連続混練機では、スクリューの形状を変えて、材料の送り力を弱め、材料の滞留時間を長くすることで、温度上昇を抑えるようにしている。   In the extrusion kneader, when supplying a maximum amount of wood flour that can be kneaded to a specified amount of resin and further supplying a necessary amount of additives, kneading is performed to solidify the molten resin. If the weight ratio of the minute exceeds 40%, the generation of frictional heat during kneading increases, and the resin temperature rises above 200 ° C., which is the preset temperature of the kneader. When the resin temperature exceeds, for example, 220 ° C., the wood powder starts to deteriorate due to heat, causing the performance of the resin component to deteriorate. Further, gas is generated by heat, the pellets of the plant fiber reinforced resin are foamed and the shape becomes non-uniform, and mixing with the resin pellets is not possible in the subsequent process. In order to solve this problem, in the continuous kneader described in Patent Document 1, the shape of the screw is changed, the feed force of the material is weakened, and the residence time of the material is lengthened to suppress the temperature rise. .

特開平６−２７０１４０号公報JP-A-6-270140

しかし、押出混練機において、材料の送り力を弱め、材料の滞留時間を長くして温度上昇を抑える方法では、押出混練機が特殊で汎用性に欠ける。   However, in the extrusion kneader, the extrusion kneader is special and lacks versatility in the method of suppressing the temperature rise by weakening the feed force of the material and extending the residence time of the material.

本発明は、上記問題点を解決するためになされたものであり、本発明が解決しようとする課題は、汎用の混練機を使用しても、木粉が劣化しない温度以下で混練を行なえるようにして、高品質の高濃度植物繊維強化樹脂を製造することである。   The present invention has been made to solve the above-mentioned problems, and the problem to be solved by the present invention is that kneading can be performed at a temperature below which wood powder does not deteriorate even when a general-purpose kneader is used. Thus, it is manufacturing high quality high concentration vegetable fiber reinforced resin.

上記した課題は、各請求項の発明によって解決される。請求項１の発明は、規定量の樹脂と、前記樹脂に対して混練が可能な最大量の木粉と、前記樹脂と木粉との量に応じて決められた量の添加剤とを混練機に供給し、前記樹脂を溶融させた状態で混練を行なうことにより植物繊維強化樹脂を製造する植物繊維強化樹脂の製造方法であって、前記樹脂は、前記木粉が劣化を開始する温度よりも低い温度で溶融可能な構成であり、前記添加剤は、前記樹脂が溶融する温度よりも低い温度で溶融する第１の添加剤と、前記樹脂が溶融する温度で固化している第２の添加剤とを備えており、全体に対する前記樹脂と第１の添加剤との重量比率が60％以上に設定されている。   The above-described problems are solved by the inventions of the claims. The invention of claim 1 kneads a specified amount of resin, a maximum amount of wood flour that can be kneaded with the resin, and an amount of additive determined according to the amount of the resin and wood flour. A plant fiber reinforced resin production method for producing a plant fiber reinforced resin by kneading in a state where the resin is melted in a state where the resin is melted, wherein the resin has a temperature higher than the temperature at which the wood flour starts to deteriorate. The additive can be melted at a low temperature, and the additive includes a first additive that melts at a temperature lower than a temperature at which the resin melts, and a second solidified at a temperature at which the resin melts. And a weight ratio of the resin and the first additive to the whole is set to 60% or more.

本発明によると、全体に対する樹脂と第１の添加剤との重量比率が60％以上に設定されている。ここで、第１の添加剤は、樹脂が溶融する温度よりも低い温度で溶融する。このため、第１の添加剤は、混練機による混練の際に、樹脂と共に溶融するようになる。このため、混練時に、溶融する材料（樹脂、第１の添加剤）の重量比率が60％以上となり、溶融しない固形成分である木粉と第２の添加剤との重量比率が40％以下となる。このように、混練の際、固形成分の重量比率が40％以下となるため、混練による摩擦熱が発生し難く、材料の温度上昇を抑えることができる。この結果、前記木粉の劣化が抑制され、高品質の高濃度植物繊維強化樹脂を製造できる。   According to the present invention, the weight ratio of the resin and the first additive to the whole is set to 60% or more. Here, the first additive melts at a temperature lower than the temperature at which the resin melts. For this reason, the 1st additive comes to melt with resin at the time of kneading with a kneader. For this reason, at the time of kneading, the weight ratio of the material to be melted (resin, first additive) is 60% or more, and the weight ratio of the wood powder, which is a solid component that does not melt, to the second additive is 40% or less. Become. Thus, since the weight ratio of the solid component is 40% or less during kneading, frictional heat due to kneading is hardly generated, and the temperature rise of the material can be suppressed. As a result, deterioration of the wood flour is suppressed, and a high-quality high-concentration plant fiber reinforced resin can be produced.

請求項２に係る発明によると、第１の添加剤の重量比率が第２の添加剤の重量比率よりも大きく設定されている。即ち、樹脂と共に溶融する添加剤の重量比率が大きくなる。   According to the invention which concerns on Claim 2, the weight ratio of the 1st additive is set larger than the weight ratio of the 2nd additive. That is, the weight ratio of the additive that melts together with the resin increases.

請求項３に係る発明によると、全体に対する第１の添加剤の重量比率が20％を超えている。即ち、第１の添加剤の重量比率が20％よりも多くなることで、樹脂と木粉との重量比率を変えずに、溶融する材料（樹脂、第１の添加剤）の重量比率を60％以上とすることができる。   According to the invention of claim 3, the weight ratio of the first additive to the whole exceeds 20%. That is, when the weight ratio of the first additive is more than 20%, the weight ratio of the material to be melted (resin, first additive) is changed to 60 without changing the weight ratio of the resin to the wood flour. % Or more.

請求項４に係る発明によると、第１の添加剤の比重は、樹脂の比重よりも大きく設定されており、前記第１の添加剤は、前記樹脂が混練機に供給された後で、前記混練機に供給される。このように、最初に樹脂が混練機に供給されるため、樹脂が下に溜った状態で溶融するようになる。次に、混練機に供給された第１の添加剤は溶融した樹脂に沈んだ状態で溶融するようになる。このため、樹脂のペレットが第１の添加剤に浮いた状態で溶けずに残るような不具合を防止できる。   According to the invention of claim 4, the specific gravity of the first additive is set to be larger than the specific gravity of the resin, and the first additive is added after the resin is supplied to the kneader. Supplied to the kneader. In this way, since the resin is first supplied to the kneader, the resin is melted in a state where the resin is accumulated below. Next, the first additive supplied to the kneader is melted in a state where it is submerged in the molten resin. For this reason, it is possible to prevent such a problem that the resin pellets remain undissolved in the state where they float on the first additive.

請求項５の発明によると、混練機は、一端側に入口部、他端側に出口部が設けられたシリンダ部と、前記シリンダ部の内側で軸心回りに回転可能に構成された混練用のスクリューとを備え、前記シリンダ部の出口部から混練後の製品が押出される構成であり、前記樹脂は前記シリンダ部の入口部から前記混練機に供給され、前記第１の添加剤は、前記シリンダ部の途中位置から前記混練機に供給される。このため、樹脂が確実に溶融した状態で第１の添加剤を混練機に供給できるようになる。   According to the invention of claim 5, the kneading machine comprises a cylinder part provided with an inlet part on one end side and an outlet part on the other end side, and a kneading machine configured to be rotatable around an axis inside the cylinder part. The product after kneading is extruded from the outlet portion of the cylinder portion, the resin is supplied from the inlet portion of the cylinder portion to the kneader, and the first additive is The kneading machine is supplied from an intermediate position of the cylinder part. For this reason, it becomes possible to supply the first additive to the kneader while the resin is reliably melted.

請求項６の発明によると、木粉は、シリンダ部の途中位置から混練機に供給される。このため、混練機内の木粉の滞留時間を短くでき、木粉の劣化を極力抑えることができる。   According to invention of Claim 6, wood flour is supplied to a kneading machine from the middle position of a cylinder part. For this reason, the residence time of the wood flour in the kneader can be shortened, and deterioration of the wood flour can be suppressed as much as possible.

請求項７の発明によると、木粉は、杉材の粉末である。   According to the invention of claim 7, the wood powder is a cedar powder.

本発明によると、木粉が劣化しない温度以下で混練を行なえるようになり、高品質の高濃度の植物繊維強化樹脂を製造できる。   According to the present invention, kneading can be performed at a temperature below which wood powder does not deteriorate, and a high-quality and high-concentration plant fiber reinforced resin can be produced.

本発明の実施形態１に係る植物繊維強化樹脂の製造方法を表わす模式図である。It is a schematic diagram showing the manufacturing method of the vegetable fiber reinforced resin which concerns on Embodiment 1 of this invention. 前記植物繊維強化樹脂のペレットと樹脂のペレットとを混合させる様子を表す模式図である。It is a schematic diagram showing a mode that the pellet of the said vegetable fiber reinforced resin and the pellet of resin are mixed. 前記植物繊維強化樹脂のペレットと樹脂のペレットとを混合させたブレンド品を使用して樹脂製品を成形する様子を表す模式図である。It is a schematic diagram showing a mode that a resin product is shape | molded using the blend goods which mixed the pellet of the said vegetable fiber reinforced resin, and the pellet of resin. 前記植物繊維強化樹脂の製造方法において使用される混練機の模式側面図である。It is a model side view of the kneader used in the manufacturing method of the said vegetable fiber reinforced resin. 前記植物繊維強化樹脂の材料配合の重量比率を表わす円グラフである。It is a pie chart showing the weight ratio of the material mixing | blending of the said vegetable fiber reinforced resin. 前記植物繊維強化樹脂の材料配合表である。It is a material compounding table | surface of the said vegetable fiber reinforced resin.

［実施形態１］
以下、図１から図６に基づいて本発明の実施形態１に係る植物繊維強化樹脂の製造方法と、植物繊維強化樹脂を用いて実際の自動車用の樹脂部品を製造する手順について説明する。ここで、前記自動車用の樹脂部品は、例えば、エンジンルーム内で使用されるワイヤーハーネス、あるいはフォグランプ等のブラケットである。 [Embodiment 1]
Hereinafter, the manufacturing method of the vegetable fiber reinforced resin which concerns on Embodiment 1 of this invention based on FIGS. 1-6, and the procedure which manufactures the resin component for actual vehicles using a vegetable fiber reinforced resin are demonstrated. Here, the resin component for automobiles is, for example, a wire harness used in an engine room or a bracket such as a fog lamp.

＜自動車用の樹脂部品の製造方法概要について＞
前記ワイヤーハーネス等の樹脂部品Ｗの材料としては、成形性に優れた熱可塑性樹脂であるポリプロピレン１２が好適に使用される。また、前記ワイヤーハーネス等の樹脂部品Ｗは、エンジンルーム内の高温環境下で使用されるため、強度や耐熱性に加えて、難燃性も要求される。このため、前記ポリプロピレン樹脂１２（以下、樹脂１２という）には、植物繊維としての木粉１４と難燃材等の添加剤１６とが加えられる。樹脂１２に対して木粉１４と難燃材等の添加剤１６とを加える場合には、図１に示すように、押出混練機２０が使用される。即ち、押出混練機２０では、樹脂１２を200℃程度に加熱して溶融させた状態で木粉１４等と混練する。ここで、木粉１４は、樹脂１２の温度が220℃を超えて上昇すると劣化するため、後記するように、混練時における添加剤１６の固形成分の重量比率を下げることで摩擦熱に起因する温度上昇を抑えている。 <Outline of manufacturing method of resin parts for automobiles>
As a material of the resin component W such as the wire harness, polypropylene 12 which is a thermoplastic resin excellent in moldability is preferably used. Moreover, since the resin parts W such as the wire harness are used in a high temperature environment in the engine room, in addition to strength and heat resistance, flame resistance is also required. For this reason, to the said polypropylene resin 12 (henceforth resin 12), the wood powder 14 as plant fiber and additives 16, such as a flame retardant, are added. When the wood powder 14 and the additive 16 such as a flame retardant are added to the resin 12, an extrusion kneader 20 is used as shown in FIG. That is, in the extrusion kneader 20, the resin 12 is kneaded with the wood flour 14 and the like in a state where the resin 12 is heated to about 200 ° C. and melted. Here, since the wood powder 14 deteriorates when the temperature of the resin 12 rises above 220 ° C., as described later, it is caused by frictional heat by reducing the weight ratio of the solid component of the additive 16 at the time of kneading. Temperature rise is suppressed.

押出混練機２０は、規定量の樹脂１２に対して混練が可能な最大量の木粉１４を加え、さらに必要量の添加剤１６を添加して混練を行なうことで、高濃度の植物繊維強化樹脂１８を製造する。そして、押出混練機２０で混練された高濃度の植物繊維強化樹脂１８は所定サイズのペレットに成形される。次に、高濃度の植物繊維強化樹脂１８のペレットは、図２に示すように、樹脂１２のペレットと予め決められた比率で混合される。即ち、植物繊維強化樹脂１８のペレットは、樹脂部品Ｗに応じて予め決められた比率になるように、樹脂１２のペレットによって希釈される。そして、植物繊維強化樹脂１８のペレットと樹脂１２のペレットとのブレンド品１９が、図３に示すように、射出成形機に供給されて樹脂部品Ｗが成形される。このように、押出混練機２０で高濃度の植物繊維強化樹脂１８を製造し、後工程で高濃度の植物繊維強化樹脂１８を樹脂１２により希釈して使用する方法のため、押出混練機２０の能力を最大限に利用でき、低コスト化を図ることができる。   The extrusion kneader 20 adds a maximum amount of wood flour 14 that can be kneaded to a specified amount of resin 12, and further adds a necessary amount of additive 16 to perform kneading, thereby reinforcing a high concentration of vegetable fiber. Resin 18 is manufactured. And the high concentration vegetable fiber reinforced resin 18 kneaded by the extrusion kneader 20 is formed into pellets of a predetermined size. Next, the pellets of the high-concentration plant fiber reinforced resin 18 are mixed with the pellets of the resin 12 at a predetermined ratio as shown in FIG. That is, the pellets of the plant fiber reinforced resin 18 are diluted with the pellets of the resin 12 so as to have a predetermined ratio according to the resin part W. Then, the blended product 19 of the pellets of the vegetable fiber reinforced resin 18 and the pellets of the resin 12 is supplied to an injection molding machine as shown in FIG. As described above, the extrusion kneader 20 is used to produce the high concentration vegetable fiber reinforced resin 18 and dilute the high concentration plant fiber reinforced resin 18 with the resin 12 in the subsequent process. Capability can be utilized to the maximum and cost can be reduced.

＜押出混練機２０について＞
押出混練機２０は、樹脂１２等を溶融させた状態で木粉１４、及び添加剤１６と混練させて、植物繊維強化樹脂１８を製造する機械である。押出混練機２０は、図４に示すように、混練機本体２００と、混練機本体２００から押出された植物繊維強化樹脂１８の軟化棒状体１８ｊを水冷する冷却槽２３と、冷却後の軟化棒状体１８ｊをペレットのサイズに切断するカッタ２５とを備えている。 <About the extrusion kneader 20>
The extrusion kneader 20 is a machine for producing the plant fiber reinforced resin 18 by kneading the wood powder 14 and the additive 16 with the resin 12 and the like melted. As shown in FIG. 4, the extrusion kneader 20 includes a kneader main body 200, a cooling bath 23 for water-cooling the softened rod-shaped body 18j of the plant fiber reinforced resin 18 extruded from the kneader main body 200, and a softened rod shape after cooling. And a cutter 25 for cutting the body 18j into a pellet size.

混練機本体２００は、図４に示すように、一端側（左側）に入口部２０１ｅ、他端側（右側）に出口部２０１ｐが設けられた円筒形のシリンダ部２０１と、そのシリンダ部２０１内に同軸に収納された螺旋状のスクリュー２０３とを備えている。そして、シリンダ部２０１の周囲には、シリンダ部２０１内を加熱するためのヒータ２０２が設けられている。また、シリンダ部２０１の下側には、そのシリンダ部２０１に沿って冷却装置２０４が設けられている。これにより、混練機本体２００は、シリンダ部２０１内の温度が約200℃に制御される。   As shown in FIG. 4, the kneading machine main body 200 includes a cylindrical cylinder portion 201 provided with an inlet portion 201 e on one end side (left side) and an outlet portion 201 p on the other end side (right side), and the inside of the cylinder portion 201. And a spiral screw 203 accommodated coaxially. A heater 202 for heating the inside of the cylinder unit 201 is provided around the cylinder unit 201. A cooling device 204 is provided below the cylinder portion 201 along the cylinder portion 201. Thereby, as for the kneading machine main body 200, the temperature in the cylinder part 201 is controlled to about 200 degreeC.

また、混練機本体２００は、シリンダ部２０１の入口部２０１ｅ側にモータ等を備える駆動装置２０５が設けられており、駆動装置２０５の減速機２０５ｗの出力軸（図示省略）がスクリュー２０３に同軸に連結されている。このため、駆動装置２０５が駆動されることで、スクリュー２０３がシリンダ部２０１内で軸心回りに回転し、混練が行なわれる。さらに、混練機本体２００は、シリンダ部２０１の入口部２０１ｅに樹脂１２のペレット等を供給する第１ホッパー２０７と、シリンダ部２０１の途中位置に木粉１４及び難燃材等の添加剤１６を供給する第２ホッパー２０８とを備えている。   Further, the kneader body 200 is provided with a driving device 205 including a motor or the like on the inlet portion 201e side of the cylinder portion 201, and the output shaft (not shown) of the speed reducer 205w of the driving device 205 is coaxial with the screw 203. It is connected. For this reason, when the driving device 205 is driven, the screw 203 rotates around the axis in the cylinder portion 201, and kneading is performed. Furthermore, the kneader main body 200 includes a first hopper 207 that supplies pellets of the resin 12 to the inlet portion 201e of the cylinder portion 201, and an additive 16 such as wood powder 14 and a flame retardant at an intermediate position of the cylinder portion 201. And a second hopper 208 to be supplied.

＜高濃度の植物繊維強化樹脂１８の材料配合について＞
高濃度の植物繊維強化樹脂１８の材料としては、図５、図６に示すように、ポリプロピレン樹脂１２（融点165℃、比重0.9、分子量265000 図６参照）が使用される。ここで、全体に対する樹脂１２の重量比率は40.2％に設定されている。さらに、樹脂部品Ｗの強度と耐熱性とを向上させるため、木粉１４が添加される。ここで、木粉１４の重量比率は、全体の31.7％に設定されており、混練が可能な最大値である。なお、木粉１４には杉の間伐材の粉末が使用される。 <About the material composition of the high concentration plant fiber reinforced resin 18>
As a material of the high-concentration plant fiber reinforced resin 18, as shown in FIGS. 5 and 6, polypropylene resin 12 (melting point 165 ° C., specific gravity 0.9, molecular weight 265000, see FIG. 6) is used. Here, the weight ratio of the resin 12 to the whole is set to 40.2%. Furthermore, in order to improve the strength and heat resistance of the resin part W, the wood powder 14 is added. Here, the weight ratio of the wood flour 14 is set to 31.7% of the whole, which is the maximum value capable of kneading. The wood powder 14 is cedar thinned wood powder.

また、樹脂部品Ｗの難燃性を向上させるための添加剤１６として、難燃材が重量比率で13.5％、難燃材の働きを促進させる難燃助剤が重量比率で6.8％添加される。ここで、難燃材としてはジブロモプロピルエーテル（融点95〜115℃、比重1.1、分子量1580）、難燃助剤としては三酸化アンチモン（融点656℃、比重5.2、分子量291.5）が使用される。さらに、添加剤１６として樹脂１２（ポリポロピレン（PP））の耐熱劣化を防止するための酸化防止剤が重量比率で5.8％添加される。ここで、酸化防止剤としては、Pentaerythritol Tetrakis（融点110〜125℃、比重1.15、分子量1178）が使用される。   Further, as an additive 16 for improving the flame retardancy of the resin component W, a flame retardant is added by 13.5% by weight, and a flame retardant assistant that promotes the function of the flame retardant is added by 6.8% by weight. . Here, dibromopropyl ether (melting point 95 to 115 ° C., specific gravity 1.1, molecular weight 1580) is used as the flame retardant, and antimony trioxide (melting point 656 ° C., specific gravity 5.2, molecular weight 291.5) is used as the flame retardant aid. Further, as an additive 16, an antioxidant for preventing the heat resistance deterioration of the resin 12 (polypropylene (PP)) is added by 5.8% by weight. Here, Pentaerythritol Tetrakis (melting point: 110 to 125 ° C., specific gravity: 1.15, molecular weight: 1178) is used as the antioxidant.

その他の添加剤１６として、樹脂１２と難燃材等とを混ざり易くするための相溶化剤、例えば、MAPP（Maleic anhydride-modified polypropylene ）（融点160℃、比重0.9）が重量比率で1.4％添加される。また、電線に使用される銅に対する銅害防止材（融点225〜227℃）が重量比率で0.6％添加される。ここで、前記押出混練機２０では、シリンダ部２０１内の温度が約200℃に温度制御されている。このため、上記した植物繊維強化樹脂１８の材料の中で、融点が200℃よりも低い材料、即ち、樹脂１２（融点165℃）（40.2％）、難燃材（融点95〜115℃）（13.5％）、酸化防止剤（融点110〜125℃）（5.8％）、相溶化剤（融点160℃）（1.4％）が押出混練機２０のシリンダ部２０１内で溶融するようになる。   As other additives 16, a compatibilizer for easily mixing the resin 12 and the flame retardant, for example, MAPP (Maleic anhydride-modified polypropylene) (melting point 160 ° C., specific gravity 0.9) is added by 1.4% by weight. Is done. Moreover, the copper damage prevention material (melting | fusing point 225-227 degreeC) with respect to the copper used for an electric wire is added 0.6% by weight ratio. Here, in the extrusion kneader 20, the temperature in the cylinder part 201 is controlled to about 200 ° C. For this reason, among the materials of the above-described plant fiber reinforced resin 18, a material having a melting point lower than 200 ° C., that is, resin 12 (melting point 165 ° C.) (40.2%), flame retardant (melting point 95 to 115 ° C.) ( 13.5%), an antioxidant (melting point 110 to 125 ° C.) (5.8%), and a compatibilizer (melting point 160 ° C.) (1.4%) are melted in the cylinder part 201 of the extrusion kneader 20.

さらに、融点が200℃よりも低い材料であっても、樹脂１２は融点165℃で、分子量265000であるのに対し、難燃材は融点95〜115℃で分子量1580、酸化防止剤は融点110〜125℃で分子量1178であるため、難燃材及び酸化防止剤は樹脂１２に対して格段に溶融し易くなる。さらに、樹脂１２の比重が0.9に対して、難燃材の比重が1.1、酸化防止剤の比重が1.15であるため、樹脂１２は、難燃材及び酸化防止剤に対して浮き易くなる。また、相溶化剤は融点160℃であるため、樹脂１２よりも溶融し易くなる。なお、相溶化剤の比重は0.9で樹脂１２と等しいため、相溶化剤は難燃材及び酸化防止剤に対して浮き易くなる。   Furthermore, even if the melting point is lower than 200 ° C., the resin 12 has a melting point of 165 ° C. and a molecular weight of 265,000, whereas the flame retardant has a melting point of 95 to 115 ° C. and a molecular weight of 1580, and the antioxidant has a melting point of 110 Since the molecular weight is 1178 at ˜125 ° C., the flame retardant and the antioxidant are much more easily melted with respect to the resin 12. Furthermore, since the specific gravity of the resin 12 is 0.9, the specific gravity of the flame retardant is 1.1, and the specific gravity of the antioxidant is 1.15, the resin 12 easily floats against the flame retardant and the antioxidant. Further, since the compatibilizing agent has a melting point of 160 ° C., it becomes easier to melt than the resin 12. In addition, since the specific gravity of the compatibilizer is 0.9, which is equal to the resin 12, the compatibilizer tends to float with respect to the flame retardant and the antioxidant.

即ち、難燃材、酸化防止剤、及び相溶化剤が本発明における樹脂が溶融する温度よりも低い温度で溶融する第１の添加剤に相当する。前述のように、樹脂１２の重量比率は40.2％であり、第１の添加剤の重量比率、即ち、（難燃材の重量比率13.5％）＋（酸化防止剤の重量比率5.8％）＋（相溶化剤の重量比率1.4％）が20.7％であるため、混練時に溶融する材料の比率は全体の60.9％になる。   That is, the flame retardant, the antioxidant, and the compatibilizer correspond to the first additive that melts at a temperature lower than the temperature at which the resin in the present invention melts. As described above, the weight ratio of the resin 12 is 40.2%, and the weight ratio of the first additive, that is, (weight ratio of flame retardant 13.5%) + (weight ratio of antioxidant 5.8%) + ( Since the compatibilizer weight ratio (1.4%) is 20.7%, the ratio of the material that melts during kneading is 60.9% of the total.

また、上記した植物繊維強化樹脂１８の材料の中で、木粉１４と、融点が200℃よりも高い難燃助剤（融点656℃、比重5.2、分子量291.5）、及び銅害防止材（融点225〜227℃）は、押出混練機２０のシリンダ部２０１内で固形成分として残される。即ち、難燃助剤と銅害防止材とが本発明における樹脂が溶融する温度で固化している第２の添加剤に相当する。前述のように、木粉１４の重量比率は31.7％であり、第２の添加剤の重量比率、即ち、（難燃助剤の重量比率6.8％）＋（銅害防止材の重量比率0.6％）が7.4％であるため、混練時の固形成分の重量比率が全体の39.1％になる。   Among the materials of the above-mentioned plant fiber reinforced resin 18, wood powder 14, a flame retardant aid having a melting point higher than 200 ° C. (melting point 656 ° C., specific gravity 5.2, molecular weight 291.5), and copper damage prevention material (melting point) 225-227 ° C.) remains as a solid component in the cylinder part 201 of the extrusion kneader 20. That is, the flame retardant aid and the copper damage prevention material correspond to the second additive solidified at a temperature at which the resin in the present invention melts. As described above, the weight ratio of the wood flour 14 is 31.7%, and the weight ratio of the second additive, that is, (weight ratio of flame retardant aid 6.8%) + (weight ratio of copper damage prevention material 0.6%) ) Is 7.4%, the weight ratio of solid components during kneading is 39.1% of the total.

＜押出混練機２０に対する材料供給手順について＞
上記したように、第１の添加剤である難燃材（融点95〜115℃、分子量1580、比重1.1）、酸化防止剤（融点110〜125℃、分子量1178、比重1.15）は、樹脂１２（融点165℃、分子量265000、比重0.9）に対して溶融し易く、さらに比重が大きい。このため、仮に、樹脂１２と、難燃材、及び酸化防止剤とを同時に押出混練機２０に供給すると、溶融した難燃材、酸化防止剤に対して樹脂１２のペレットが浮き上がり、樹脂１２が溶融し難くなる。これにより、樹脂１２の一部が固形成分のまま残留し、混練が良好に行なわれなくなる。 <About the material supply procedure to the extrusion kneader 20>
As described above, the flame retardant (melting point: 95 to 115 ° C., molecular weight: 1580, specific gravity: 1.1) and antioxidant (melting point: 110 to 125 ° C., molecular weight: 1178, specific gravity: 1.15), which are the first additives, are resin 12 ( It has a melting point of 165 ° C, a molecular weight of 265000, and a specific gravity of 0.9), which is easy to melt and has a higher specific gravity. For this reason, if the resin 12, the flame retardant, and the antioxidant are simultaneously supplied to the extrusion kneader 20, pellets of the resin 12 are lifted with respect to the molten flame retardant and the antioxidant, and the resin 12 It becomes difficult to melt. Thereby, a part of the resin 12 remains as a solid component, and kneading is not performed well.

この問題を解決するため、本実施形態に係る植物繊維強化樹脂１８の製造方法では、樹脂１２と、前記樹脂１２と比重が等しい相溶化剤（第１の添加剤）とを第１ホッパー２０７から混練機本体２００（シリンダ部２０１）の入口部２０１ｅに供給するようにしている。そして、難燃材と酸化防止剤（第１の添加剤）を第２ホッパー２０８からシリンダ部２０１の途中位置に供給するようにしている。これにより、樹脂１２のペレット等がシリンダ部２０１の入口部２０１ｅからシリンダ部２０１の途中位置まで移動する間に完全に溶融する。そして、溶融した樹脂１２に対してシリンダ部２０１の途中位置から溶け易い難燃材と酸化防止剤（第１の添加剤）が加えられる。これにより、比重の大きな難燃材と酸化防止剤（第１の添加剤）とが溶融した樹脂１２に沈んだ状態で溶融するようになる。したがって、樹脂１２等の溶け残りを防止できる。   In order to solve this problem, in the method for producing the vegetable fiber reinforced resin 18 according to the present embodiment, the resin 12 and the compatibilizer (first additive) having the same specific gravity as the resin 12 are removed from the first hopper 207. The kneading machine main body 200 (cylinder part 201) is supplied to the inlet part 201e. Then, the flame retardant and the antioxidant (first additive) are supplied from the second hopper 208 to the midway position of the cylinder part 201. Accordingly, the pellets of the resin 12 are completely melted while moving from the inlet portion 201e of the cylinder portion 201 to the midway position of the cylinder portion 201. Then, a flame-retardant material and an antioxidant (first additive) that are easily melted from the middle position of the cylinder portion 201 are added to the molten resin 12. Thereby, the flame retardant having a large specific gravity and the antioxidant (first additive) are melted in a state where they are submerged in the melted resin 12. Accordingly, it is possible to prevent the resin 12 and the like from being melted.

また、他の材料、即ち、難燃助剤、銅害防止剤（第２の添加剤）、及び木粉１４が第２ホッパー２０８からシリンダ部２０１の途中位置に供給される。このため、完全に溶けた状態の樹脂１２、及び相溶化剤、難燃材、酸化防止剤（第１の添加剤）に対して固形成分である難燃助剤、銅害防止剤（第２の添加剤）、及び木粉１４が加えられる混練が行なわれる。上記したように、混練時の溶融成分（樹脂１２＋第１の添加剤）の重量比率が60.9％で、固形成分（木粉１４＋第２の添加剤）の重量比率が39.1％である。即ち、固形成分（木粉１４＋第２の添加剤）の重量比率が40％以下であるため、混練時の摩擦熱に起因する温度上昇を抑えることができる。このため、混練機本体２００のシリンダ部２０１内における樹脂１２の温度を約200℃に保持することができ、木粉１４の劣化やガスの発生を抑えることができる。さらに、木粉１４を第２ホッパー２０８からシリンダ部２０１の途中位置に供給するため、木粉１４の混練機本体２００（シリンダ部２０１）内の滞留時間が短くなり、木粉１４の劣化をさらに抑えることができる。   In addition, other materials, that is, a flame retardant aid, a copper damage prevention agent (second additive), and the wood powder 14 are supplied from the second hopper 208 to the midway position of the cylinder portion 201. Therefore, the resin 12 in a completely dissolved state, the compatibilizer, the flame retardant, and the antioxidant (first additive) are solid flame retardant assistants and copper damage inhibitors (second Kneading in which the wood additive 14 and the wood flour 14 are added. As described above, the weight ratio of the molten component (resin 12 + first additive) during kneading is 60.9%, and the weight ratio of the solid component (wood flour 14 + second additive) is 39.1%. That is, since the weight ratio of the solid component (wood powder 14 + second additive) is 40% or less, it is possible to suppress an increase in temperature due to frictional heat during kneading. For this reason, the temperature of the resin 12 in the cylinder part 201 of the kneader main body 200 can be maintained at about 200 ° C., and deterioration of the wood flour 14 and generation of gas can be suppressed. Furthermore, since the wood powder 14 is supplied from the second hopper 208 to the midway position of the cylinder part 201, the residence time of the wood powder 14 in the kneader main body 200 (cylinder part 201) is shortened, and the wood powder 14 is further deteriorated. Can be suppressed.

＜本実施形態に係る植物繊維強化樹脂の製造方法の長所＞
本実施形態に係る植物繊維強化樹脂の製造方法によると、全体に対する樹脂１２と第１の添加剤１６との重量比率が60％以上に設定されている。ここで、第１の添加剤１６は、樹脂１２が溶融する温度よりも低い温度で溶融する。このため、第１の添加剤１６は、押出混練機２０による混練の際に、樹脂１２と共に溶融するようになる。このため、混練時に、溶融する樹脂１２と第１の添加剤１６とが重量比率で60％以上となり、溶融しない固形成分である木粉１４と第２の添加剤１６とが重量比率で40％以下となる。このように、混練の際、固形成分が重量比率で40％以下となるため、混練による摩擦熱が発生し難く、材料の温度上昇を抑えることができる。この結果、木粉１４の劣化が抑制され、高品質の高濃度植物繊維強化樹脂１８を製造できる。 <Advantages of the manufacturing method of the vegetable fiber reinforced resin which concerns on this embodiment>
According to the method for producing a vegetable fiber reinforced resin according to the present embodiment, the weight ratio of the resin 12 and the first additive 16 to the whole is set to 60% or more. Here, the first additive 16 melts at a temperature lower than the temperature at which the resin 12 melts. For this reason, the first additive 16 is melted together with the resin 12 during kneading by the extrusion kneader 20. For this reason, at the time of kneading, the melting resin 12 and the first additive 16 are 60% or more by weight, and the solid component that is not melted and the second additive 16 are 40% by weight. It becomes as follows. Thus, during kneading, since the solid component is 40% or less by weight, frictional heat due to kneading hardly occurs, and the temperature rise of the material can be suppressed. As a result, deterioration of the wood powder 14 is suppressed, and a high-quality high-concentration plant fiber reinforced resin 18 can be produced.

また、第１の添加剤１６の重量比率を20％よりも多くすることで、樹脂１２と木粉１４との重量比率を変えずに、溶融する材料（樹脂１２、第１の添加剤１６）の重量比率を60％以上とすることができる。さらに、樹脂１２はシリンダ部２０１の入口部２０１ｅから押出混練機２０に供給され、第１の添加剤１６（難燃材、酸化防止剤）は、シリンダ部２０１の途中位置から押出混練機２０に供給される。このため、樹脂１２が確実に溶融した状態で第１の添加剤１６（難燃材、酸化防止剤）を押出混練機２０に供給できる。このため、樹脂１２のペレットが難燃材、酸化防止剤に浮いた状態で溶けずに残るような不具合を防止できる。また、木粉１４は、シリンダ部２０１の途中位置から押出混練機２０に供給されるため、押出混練機２０内の木粉１４の滞留時間を短くでき、木粉１４の劣化を極力抑えることができる。   Further, by increasing the weight ratio of the first additive 16 to more than 20%, the material that melts without changing the weight ratio of the resin 12 and the wood powder 14 (resin 12, first additive 16). The weight ratio can be 60% or more. Further, the resin 12 is supplied to the extrusion kneader 20 from the inlet portion 201e of the cylinder portion 201, and the first additive 16 (a flame retardant, an antioxidant) is fed from the middle position of the cylinder portion 201 to the extrusion kneader 20. Supplied. For this reason, the first additive 16 (a flame retardant, an antioxidant) can be supplied to the extrusion kneader 20 in a state where the resin 12 is reliably melted. For this reason, the malfunction that the pellet of the resin 12 remains without being melted in a state where it floats on the flame retardant and the antioxidant can be prevented. Moreover, since the wood powder 14 is supplied to the extrusion kneader 20 from the middle position of the cylinder part 201, the residence time of the wood powder 14 in the extrusion kneader 20 can be shortened, and deterioration of the wood powder 14 can be suppressed as much as possible. it can.

＜変更例＞
なお、本発明は上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲における変更が可能である。例えば、本実施形態では、樹脂１２としてポリプロピレンを例示したが、ポリプロピレン以外の樹脂に本発明を適用することも可能である。また、本実施形態では、第２ホッパー２０８から難燃材と酸化防止剤（第１の添加剤）、難燃助剤、銅害防止剤（第２の添加剤）、及び木粉１４を押出混練機２０のシリンダ部２０１の途中位置に供給する例を示した。しかし、第１ホッパー２０７と第２ホッパー２０８との間に第３ホッパー等を設け、第３ホッパー等から難燃材と酸化防止剤（第１の添加剤）を木粉１４等よりも先にシリンダ部２０１の途中位置に供給することも可能である。 <Example of change>
In addition, this invention is not limited to the said embodiment, The change in the range which does not deviate from the summary of this invention is possible. For example, in the present embodiment, polypropylene is exemplified as the resin 12, but the present invention can also be applied to resins other than polypropylene. Further, in the present embodiment, the flame retardant, the antioxidant (first additive), the flame retardant aid, the copper damage inhibitor (second additive), and the wood powder 14 are extruded from the second hopper 208. The example which supplies to the middle position of the cylinder part 201 of the kneading machine 20 was shown. However, a third hopper or the like is provided between the first hopper 207 and the second hopper 208, and the flame retardant and the antioxidant (first additive) are supplied from the third hopper or the like before the wood flour 14 or the like. It is also possible to supply to the middle position of the cylinder part 201.

１２・・・・樹脂（ポリプロピレン）
１４・・・・木粉
１６・・・・添加剤（第１の添加剤、第２の添加剤）
１８・・・・植物繊維強化樹脂
２０・・・・押出混練機
２００・・・混練機本体
２０１・・・シリンダ部
２０１ｅ・・入口部
２０１ｐ・・出口部
２０３・・・スクリュー
Ｗ・・・・・樹脂部品
12 ... Resin (polypropylene)
14 ... Wood flour 16 ... Additives (first additive, second additive)
18 ... Plant fiber reinforced resin 20 ... Extrusion kneader 200 ... Kneader main body 201 ... Cylinder part 201e ... Entrance part 201p ... Outlet part 203 ... Screw W ...・ Resin parts

Claims (7)

規定量の樹脂と、前記樹脂に対して混練が可能な最大量の木粉と、前記樹脂と木粉との量に応じて決められた量の添加剤とを混練機に供給し、前記樹脂を溶融させた状態で混練を行なうことにより植物繊維強化樹脂を製造する植物繊維強化樹脂の製造方法であって、
前記樹脂は、前記木粉が劣化を開始する温度よりも低い温度で溶融可能な構成であり、
前記添加剤は、前記樹脂が溶融する温度よりも低い温度で溶融する第１の添加剤と、前記樹脂が溶融する温度で固化している第２の添加剤とを備えており、
全体に対する前記樹脂と前記第１の添加剤との重量比率が60％以上に設定されている植物繊維強化樹脂の製造方法。 A specified amount of resin, a maximum amount of wood flour that can be kneaded with the resin, and an amount of additive determined according to the amount of the resin and wood flour are supplied to the kneader, and the resin A method for producing a vegetable fiber reinforced resin by producing a plant fiber reinforced resin by kneading in a molten state,
The resin is configured to be meltable at a temperature lower than a temperature at which the wood powder starts to deteriorate,
The additive includes a first additive that melts at a temperature lower than a temperature at which the resin melts, and a second additive that is solidified at a temperature at which the resin melts,
A method for producing a vegetable fiber reinforced resin, wherein a weight ratio of the resin and the first additive to the whole is set to 60% or more. 請求項１に記載された植物繊維強化樹脂の製造方法であって、
前記第１の添加剤の重量比率が前記第２の添加剤の重量比率よりも大きく設定されている植物繊維強化樹脂の製造方法。 A method for producing a plant fiber reinforced resin according to claim 1,
The manufacturing method of the vegetable fiber reinforced resin by which the weight ratio of the said 1st additive is set larger than the weight ratio of the said 2nd additive. 請求項２に記載された植物繊維強化樹脂の製造方法であって、
全体に対する前記第１の添加剤の重量比率が20％を超えている植物繊維強化樹脂の製造方法。 A method for producing a vegetable fiber reinforced resin according to claim 2,
The manufacturing method of the vegetable fiber reinforced resin whose weight ratio of the said 1st additive with respect to the whole exceeds 20%. 請求項１から請求項３のいずれかに記載された植物繊維強化樹脂の製造方法であって、
前記第１の添加剤の比重は、前記樹脂の比重よりも大きく設定されており、
前記第１の添加剤は、前記樹脂が混練機に供給された後で、前記混練機に供給される植物繊維強化樹脂の製造方法。 A method for producing a vegetable fiber reinforced resin according to any one of claims 1 to 3,
The specific gravity of the first additive is set larger than the specific gravity of the resin,
The first additive is a method for producing a vegetable fiber reinforced resin supplied to the kneader after the resin is supplied to the kneader. 請求項４に記載された植物繊維強化樹脂の製造方法であって、
前記混練機は、一端側に入口部、他端側に出口部が設けられたシリンダ部と、前記シリンダ部の内側で軸心回りに回転可能に構成された混練用のスクリューとを備え、前記シリンダ部の出口部から混練後の製品が押出される構成であり、
前記樹脂は前記シリンダ部の入口部から前記混練機に供給され、前記第１の添加剤は、前記シリンダ部の途中位置から前記混練機に供給される植物繊維強化樹脂の製造方法。 It is a manufacturing method of the vegetable fiber reinforced resin described in Claim 4,
The kneading machine includes a cylinder part provided with an inlet part on one end side and an outlet part on the other end side, and a kneading screw configured to be rotatable around an axis inside the cylinder part, The product after kneading is extruded from the outlet of the cylinder part,
The said resin is supplied to the said kneader from the inlet part of the said cylinder part, and the said 1st additive is a manufacturing method of the vegetable fiber reinforced resin supplied to the said kneader from the middle position of the said cylinder part. 請求項５に記載された植物繊維強化樹脂の製造方法であって、
前記木粉は、前記シリンダ部の途中位置から前記混練機に供給される植物繊維強化樹脂の製造方法。 A method for producing a vegetable fiber reinforced resin according to claim 5,
The said wood flour is a manufacturing method of the vegetable fiber reinforced resin supplied to the said kneading machine from the middle position of the said cylinder part. 請求項１から請求項６のいずれかに記載された植物繊維強化樹脂の製造方法であって、
前記木粉は、杉材の粉末である植物繊維強化樹脂の製造方法。
A method for producing a plant fiber reinforced resin according to any one of claims 1 to 6,
The said wood flour is a manufacturing method of the vegetable fiber reinforced resin which is powder of cedar.
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