JP2013199008A - Method for manufacturing recycled resin molding - Google Patents
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- JP2013199008A JP2013199008A JP2012067259A JP2012067259A JP2013199008A JP 2013199008 A JP2013199008 A JP 2013199008A JP 2012067259 A JP2012067259 A JP 2012067259A JP 2012067259 A JP2012067259 A JP 2012067259A JP 2013199008 A JP2013199008 A JP 2013199008A
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Abstract
Description
本発明は、再生ポリオレフィン系、ポリスチレン系樹脂組成物を用いた再生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 recycled resin molded article using a recycled polyolefin-based or polystyrene-based resin composition.
現在市販されている冷蔵庫、エアコン、テレビ、洗濯機といった家電製品や、プリンター、スキャナー、複合機といったＯＡ機器の筐体、および内部部品には、ポリオレフィン系、ポリスチレン系の熱可塑性樹脂が一般的に用いられている。これら製品が廃棄される場合、その多くは、焼却や埋め立て、燃料として処理されてきた。 Polyolefin-based and polystyrene-based thermoplastic resins are generally used for housings and internal parts of household appliances such as refrigerators, air conditioners, TVs, washing machines, and office automation equipment such as printers, scanners, and multifunction devices. It is used. When these products are discarded, many of them have been incinerated, landfilled and processed as fuel.
しかしながら、近年、焼却、埋め立てによる環境汚染、あるいは埋め立ての処分場の不足が社会的問題となっている。そして、このような状況を受けて、２００１年４月に施行された特定家庭用機器再商品化法（家電リサイクル法）により、冷蔵庫、エアコン、テレビ、洗濯機の家庭用電気機器４品目には、リサイクル（再商品化）が義務付けられた。 However, in recent years, incineration, environmental pollution caused by landfill, or a shortage of landfill disposal sites has become a social problem. In response to this situation, the household electrical appliances 4 items such as refrigerators, air conditioners, TVs, and washing machines are categorized in accordance with the Act on the Recycling of Specified Household Appliances (the Home Appliance Recycling Law), which took effect in April 2001. Recycling (re-commercialization) was obliged.
これら家電製品に用いられる樹脂のリサイクル方法には、燃焼させて熱エネルギーを回収するサーマルリサイクル、燃焼または熱分解させて無機充填剤、オイル成分、プラスチック原料などの有価物を回収するケミカルリサイクル、そのまま粉砕して再溶融して各種成形品に加工するマテリアルリサイクルなどがある。 The recycling method for resins used in these home appliances includes thermal recycling to recover thermal energy by burning, chemical recycling to recover valuable materials such as inorganic fillers, oil components, and plastic raw materials by burning or thermal decomposition. There is material recycling that pulverizes, remelts and processes into various molded products.
環境負荷低減や資源の有効活用の観点からは、そのまま粉砕して再溶融して各種成形品に加工するマテリアルリサイクルが推進されており、よりマテリアルリサイクルしやすい樹脂への転換が望まれている。 From the viewpoint of reducing environmental burdens and effectively using resources, material recycling is being promoted by crushing, remelting and processing into various molded products, and there is a demand for conversion to resins that are easier to recycle materials.
使用済み家電製品やＯＡ機器から回収される使用済みプラスチックの中で、手解体で回収できないプラスチック残さ（シュレッダーダスト）は、異種樹脂の混合物であり、かつシリコンゴム、ウレタンゴム、ブタジエンゴム等のいわゆる異物が混入していることにより、そのまま使用することはできない。 Among used plastics collected from used home appliances and OA equipment, plastic residue (shredder dust) that cannot be collected by manual dismantling is a mixture of different types of resins, and so-called silicon rubber, urethane rubber, butadiene rubber, etc. It cannot be used as it is due to the presence of foreign matter.
これらプラスチック残さは、ポリオレフィン系（ＰＰ：Ｐｏｌｙｐｒｏｐｙｌｅｎｅ、ＰＥ：Ｐｏｌｙｅｔｈｙｌｅｎｅ）樹脂、あるいはポリスチレン系（ＨＩＰＳ：Ｈｉｇｈ Ｉｍｐａｃｔ Ｐｏｌｙｓｔｙｒｅｎｅ、ＧＰＰＳ：Ｇｅｎｅｒａｌ Ｐｕｒｐｏｓｅ Ｐｏｌｙｓｔｙｒｅｎｅ、ＡＢＳ：Ａｃｒｙｌｏｎｉｔｒｉｌｅ−Ｂｕｔａｄｉｅｎｅ−Ｓｔｙｒｅｎｅ、ＡＳ：Ａｃｒｙｌｏｎｉｔｒｉｌｅ−Ｓｔｙｒｅｎｅ）樹脂が約７０％を占めており、プラスチック残さを有効に利用するためには、これらの樹脂を純度よく効率的に選別回収する必要がある。 These plastic residues are polyolefin (PP: Polypropylene, PE: Polyethylene) resin, or polystyrene (HIPS: High Impurity Polystyrene: APS). In order to effectively use the plastic residue, it is necessary to sort and recover these resins with high purity and efficiency.
この中で、水に浮くポリオレフィン系樹脂は、比重差による分別回収が進められており、他の樹脂に比べて、分別回収しやすい。一方、ポリスチレン系樹脂の選別回収については、比重が水とほぼ同じため、比重差による選別は難しいとされているが、静電選別による分離方法も研究されており、純度の高いポリスチレン係樹脂の選別が行われている。 Among these, the polyolefin-based resin floating in water is being collected separately by specific gravity difference, and is easier to separate and collect than other resins. On the other hand, the sorting and recovery of polystyrene resin is considered to be difficult to sort by specific gravity difference because the specific gravity is almost the same as that of water, but the separation method by electrostatic sorting has also been studied, and the high purity polystyrene related resin has been studied. Sorting is done.
しかしながら、選別で取りきれなかった異物が微量ながら混入しているため、再生樹脂を用いた製品製造においては、混入異物による外観不良が発生する。このため、再生樹脂の適用製品が限定されるという問題がある。 However, since a small amount of foreign matter that could not be removed by the sorting is included, in the production of products using recycled resin, appearance defects due to the mixed foreign matter occur. For this reason, there exists a problem that the application product of recycled resin is limited.
このような問題に対して、少量の異物を含んだ状態でも、異物の視認性を低下させる方法が考えられている（例えば、特許文献１、２参照）。特許文献１では、廃プラスチックに光遮蔽製成分を混合することで、異物の視認性を低下させる方法が記載されている。 In order to solve such a problem, a method of reducing the visibility of a foreign substance even in a state including a small amount of the foreign substance has been considered (see, for example, Patent Documents 1 and 2). Patent Document 1 describes a method of reducing the visibility of foreign matter by mixing a light shielding component with waste plastic.
また、特許文献２では、再生樹脂に光反射性顔料と光吸収性顔料を添加することで異物をマスキングして、異物の存在を隠蔽して目立ちにくくする方法が記載されている。 Patent Document 2 describes a method of masking foreign matter by adding a light-reflecting pigment and a light-absorbing pigment to the recycled resin so as to conceal the presence of the foreign matter and make it less noticeable.
しかしながら、従来技術には、以下のような課題がある。
少量の異物を含んだ再生樹脂に、異物の視認性を低下させる添加剤を加える方法としては、再生樹脂の溶融混練時に添加する方法があるが、この溶融混練工程では少量の異物を除去する目的で金属メッシュが使用されており、添加剤も除去される可能性がある。これを回避するため、溶融混練を２回に分けて行う方法もあるが、この場合、樹脂自体の熱劣化および工程増加による価格増が懸念される。また、添加剤自体に高価なものが多く、必然的に再生樹脂も高価になってしまう。
However, the prior art has the following problems.
As a method of adding an additive that reduces the visibility of foreign matter to a recycled resin containing a small amount of foreign matter, there is a method of adding at the time of melt-kneading of the recycled resin. Metal mesh is used and additives may be removed. In order to avoid this, there is a method in which the melt-kneading is performed in two steps, but in this case, there is a concern that the resin itself is thermally deteriorated and the price is increased due to an increase in processes. In addition, many additives are expensive, and the recycled resin is inevitably expensive.
本発明は、上記のような問題点を解決するためになされたものであり、追加の溶融混練や、添加剤の使用なしに、再生樹脂成形品中の異物の視認性を低下させることのできる再生樹脂成形品の製造方法を得ることを目的とする。 The present invention has been made to solve the above-described problems, and can reduce the visibility of foreign matters in a recycled resin molded article without additional melt-kneading and use of additives. It aims at obtaining the manufacturing method of a recycled resin molded product.
本発明に係る再生樹脂成形品の製造方法は、異物を含んだ再生樹脂を用いた再生樹脂成形品の製造方法であって、金型を用いて成形対象となる成形品表面に微細な凹凸形状を転写させることで異物の露出を低減させる転写ステップを備え、転写ステップにより成型品表面に形成された微細な凹凸形状は、Ｖ字形状を有し、Ｖ字形状の底辺の長さＬ（μｍ）と高さＨ（μｍ）の関係がＨ＞５０μｍ、かつＨ≧Ｌである。 The method for producing a recycled resin molded product according to the present invention is a method for producing a recycled resin molded product using a recycled resin containing foreign matter, and has a fine uneven shape on the surface of the molded product to be molded using a mold. A transfer step that reduces the exposure of foreign matter by transferring the surface, and the fine uneven shape formed on the surface of the molded product by the transfer step has a V-shape, and the length L (μm of the bottom of the V-shape ) And height H (μm) are H> 50 μm and H ≧ L.
本発明によれば、所定の数値条件を満たすような微細な凹凸形状を成形品表面に転写し、再生樹脂中に含まれる異物の成形品表面への露出を低減させることにより、追加の溶融混練や、添加剤の使用なしに、再生樹脂成形品中の異物の視認性を低下させることのできる再生樹脂成形品の製造方法を得ることができる。 According to the present invention, an additional melt-kneading is performed by transferring a fine concavo-convex shape that satisfies a predetermined numerical condition to the surface of the molded product, and reducing the exposure of foreign matter contained in the recycled resin to the surface of the molded product. In addition, a method for producing a recycled resin molded product that can reduce the visibility of foreign matters in the recycled resin molded product without using an additive can be obtained.
以下、本発明の再生樹脂成形品の製造方法の好適な実施の形態につき図面を用いて説明する。また、以下の説明においては、まず、実施の形態１〜６として、成型品表面に転写される微細な凹凸形状の種類について説明し、その後、実施の形態１〜６に対応した具体的な実施例１〜６と、比較例１〜１７とを対比させながら、本発明で規定する所定の数値条件により、顕著な効果が得られることを説明する。 Hereinafter, preferred embodiments of a method for producing a recycled resin molded product according to the present invention will be described with reference to the drawings. In the following description, first, as Embodiments 1 to 6, the types of fine uneven shapes transferred to the surface of the molded product will be described, and then specific implementation corresponding to Embodiments 1 to 6 will be described. While comparing Examples 1 to 6 with Comparative Examples 1 to 17, it will be described that a remarkable effect can be obtained by a predetermined numerical condition defined in the present invention.
実施の形態１．
図１は、本発明の実施の形態１に係る成形品表面形状の断面図である。成形品表面には、Ｖ字の凹凸が付与されている。Ｖ形状の底辺の長さＬ（μｍ）と、高さＨ（μｍ）が、下式（１）の関係を有する場合には、異物が成形品表面に露出することを防止でき、異物の視認性を低下させることができることを、後述する実施例１、および比較例１〜３の結果から導出した。
Ｈ＞５０μｍ かつ Ｈ≧Ｌ （１）
Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of the surface shape of a molded product according to Embodiment 1 of the present invention. V-shaped irregularities are provided on the surface of the molded product. When the length L (μm) of the base of the V shape and the height H (μm) have the relationship of the following formula (1), it is possible to prevent the foreign matter from being exposed to the surface of the molded product and It was derived from the results of Example 1 and Comparative Examples 1 to 3 that will be described later.
H> 50 μm and H ≧ L (1)
実施の形態２．
図２は、本発明の実施の形態２に係る成形品表面形状の上面図である。また、図３は、本発明の実施の形態２に係る図２の成形品表面形状のａａ’断面図である。成形品表面には、三角錐形状の突起（凹凸）が付与されている。三角錐底面の三角形の長辺に対する頂点から長辺に下ろした垂線の長さＬ（μｍ）と、三角錐の高さＨ（μｍ）が、下式（２）の関係を有する場合には、異物が成形品表面に露出することを防止でき、異物の視認性を低下させることができることを、後述する実施例２、および比較例４〜６の結果から導出した。
Ｈ＞５０μｍ かつ Ｈ≧Ｌ （２）
Embodiment 2. FIG.
FIG. 2 is a top view of the surface shape of the molded product according to Embodiment 2 of the present invention. FIG. 3 is a cross-sectional view of the surface shape of the molded product of FIG. 2 according to Embodiment 2 of the present invention. Triangular pyramidal protrusions (irregularities) are provided on the surface of the molded product. When the length L (μm) of the perpendicular line dropped from the apex to the long side of the triangle on the bottom of the triangular pyramid and the height H (μm) of the triangular pyramid have the relationship of the following formula (2): It was derived from the results of Example 2 and Comparative Examples 4 to 6, which will be described later, that foreign matter can be prevented from being exposed on the surface of the molded product and visibility of the foreign matter can be reduced.
H> 50 μm and H ≧ L (2)
実施の形態３．
図４は、本発明の実施の形態３に係る成形品表面形状の上面図である。また、図５は、本発明の実施の形態３に係る図４の成形品表面形状のａａ’断面図である。成形品表面には、四角錘形状の突起（凹凸）が付与されている。四角錘底面の四角形の２本の対角線の内、長い方の対角線の長さＬ（μｍ）と、四角錘の高さＨ（μｍ）が、下式（３）の関係を有する場合には、異物が成形品表面に露出することを防止でき、異物の視認性を低下させることができることを、後述する実施例３、および比較例７〜９の結果から導出した。
Ｈ＞５０μｍ かつ Ｈ≧Ｌ （３）
Embodiment 3 FIG.
FIG. 4 is a top view of the surface shape of the molded product according to Embodiment 3 of the present invention. FIG. 5 is a cross-sectional view taken along the line aa ′ of the surface shape of the molded product of FIG. 4 according to Embodiment 3 of the present invention. The surface of the molded product is provided with quadrangular pyramid-shaped protrusions (irregularities). When the length L (μm) of the longer diagonal line of the two square diagonal lines on the bottom surface of the square weight and the height H (μm) of the square weight have the relationship of the following formula (3): It was derived from the results of Example 3 and Comparative Examples 7 to 9, which will be described later, that foreign matter can be prevented from being exposed to the surface of the molded product and visibility of the foreign matter can be reduced.
H> 50 μm and H ≧ L (3)
実施の形態４．
図６は、本発明の実施の形態４に係る成形品表面形状の断面図である。成形品表面には、矩形上の突起（凹凸）が付与されている。矩形形状の長さＬ（μｍ）と、平坦部の長さＬ’（μｍ）と、矩形の高さＨ（μｍ）が、下式（４）の関係を有する場合には、異物が成形品表面に露出することを防止でき、異物の視認性を低下させることができることを、後述する実施例４、および比較例１０〜１２の結果から導出した。
Ｈ＞５０μｍ かつ Ｈ≧Ｌ かつ Ｌ’＜５０μｍ （４）
Embodiment 4 FIG.
FIG. 6 is a cross-sectional view of the surface shape of the molded product according to Embodiment 4 of the present invention. On the surface of the molded product, rectangular protrusions (irregularities) are provided. When the length L (μm) of the rectangular shape, the length L ′ (μm) of the flat portion, and the height H (μm) of the rectangle have the relationship of the following formula (4), the foreign matter is a molded product. It was derived from the results of Example 4 and Comparative Examples 10 to 12 described later that exposure to the surface can be prevented and the visibility of foreign matter can be reduced.
H> 50 μm and H ≧ L and L ′ <50 μm (4)
実施の形態５．
図７は、本発明の実施の形態５に係る成形品表面形状の斜視図である。成形品表面には、矩形上の突起（凹凸）が２次元的に分布している。矩形側面に沿った方向の矩形形状の長さＬ（μｍ）、平坦部の長さＬ’（μｍ）、矩形側面に沿った方向と垂直方向の矩形形状長さＭ（μｍ）、平坦部の長さＭ’（μｍ）、矩形の高さＨ（μｍ）が、下式（５）の関係を有する場合には、異物が成形品表面に露出することを防止でき、異物の視認性を低下させることができることを、後述する実施例５、および比較例１３〜１５の結果から導出した。
Ｈ＞５０μｍ かつ Ｈ≧Ｌ、Ｍ かつ Ｌ’、Ｍ’＜５０μｍ （５）
Embodiment 5 FIG.
FIG. 7 is a perspective view of the surface shape of the molded product according to Embodiment 5 of the present invention. On the surface of the molded article, rectangular projections (unevenness) are two-dimensionally distributed. The length L (μm) of the rectangular shape in the direction along the rectangular side surface, the length L ′ (μm) of the flat portion, the rectangular shape length M (μm) in the direction perpendicular to the direction along the rectangular side surface, When the length M ′ (μm) and the height H (μm) of the rectangle have the relationship of the following formula (5), it is possible to prevent the foreign matter from being exposed to the surface of the molded product and to reduce the visibility of the foreign matter. It was derived from the results of Example 5 and Comparative Examples 13 to 15 described later.
H> 50 μm and H ≧ L, M and L ′, M ′ <50 μm (5)
実施の形態６．
上述した実施の形態１〜５は、いずれも定型の凹凸形状を有する場合について説明した。これに対して、本実施の形態６では、不定形の凹凸形状（シボ形状）を有する場合にも同様の効果が得られることを説明する。
Embodiment 6 FIG.
Embodiments 1 to 5 described above have been described with respect to the case of having a regular uneven shape. On the other hand, in the sixth embodiment, it will be described that the same effect can be obtained even when an irregular concavo-convex shape (texture shape) is provided.
図８は、本発明の実施の形態６に係る成形品表面の凹凸形状測定結果の模式図であり、シボ形状に対して表面形状測定を行い、凹凸形状の高さを測定した結果を模式的に示した図である。さらに、図９は、本発明の実施の形態６に係る成形品表面の凹凸形状測定データのフーリエ変換結果の模式図であり、先の図８の測定データに対してフーリエ変換を行い、凹凸形状データを波数変換した結果を模式的に示した図である。 FIG. 8 is a schematic diagram of the uneven shape measurement result on the surface of the molded article according to Embodiment 6 of the present invention. The surface shape measurement is performed on the embossed shape, and the result of measuring the height of the uneven shape is schematically shown. It is the figure shown in. Furthermore, FIG. 9 is a schematic diagram of a Fourier transform result of the uneven shape measurement data on the surface of the molded article according to Embodiment 6 of the present invention, and Fourier transform is performed on the measurement data of FIG. It is the figure which showed typically the result of having carried out wave number conversion of data.
フーリエ変換を行った結果として、横軸が波数Ｋ（ｍ−１）、縦軸が振幅の二乗Ｈ（μｍ２）として、図９に示すようなスペクトルが得られる。そして、得られたスペクトルにおいて、Ｋ＞２．５ｍ−１の波数に、Ｔ＞５０μｍ２のピークがある場合には、凹凸が十分に微細かつ高いため、異物が成形品表面に露出することを防止でき、異物の視認性を低下させることができることを、後述する実施例６、および比較例１６、１７の結果から導出した。 As a result of the Fourier transform, a spectrum as shown in FIG. 9 is obtained with the horizontal axis representing the wave number K (m −1 ) and the vertical axis representing the square of the amplitude H (μm 2 ). In the obtained spectrum, when there is a peak of T> 50 μm 2 at a wave number of K> 2.5 m −1 , the unevenness is sufficiently fine and high, so that the foreign matter is exposed on the surface of the molded product. That it can prevent and the visibility of a foreign material can be reduced was derived from the results of Example 6 and Comparative Examples 16 and 17 described later.
なお、上述した実施の形態１〜６における成形品を得る方法は、射出成形、圧縮成形等の一般的な成形方法が用いられる。射出成形においては、射出圧縮成形を用い、金型形状の転写性を向上させてもよい。また、使用する金型は、成形品の表面寸法が実施の形態１〜６で記載した範囲に入れば何でもよく、材質、寸法等、特に規定はない。好ましくは、急加熱急冷却金型装置を用い、金型形状の転写性を向上させるほうがよい。 In addition, as a method for obtaining the molded product in Embodiments 1 to 6 described above, a general molding method such as injection molding or compression molding is used. In injection molding, injection compression molding may be used to improve mold shape transferability. Moreover, the metal mold | die to be used may be anything as long as the surface dimension of the molded product falls within the range described in the first to sixth embodiments, and there are no particular restrictions on the material, dimensions, and the like. Preferably, it is better to improve the transferability of the mold shape by using a rapid heating and rapid cooling mold apparatus.
また、使用する樹脂は、再生樹脂であれば何でもよく、特に限定しない。成形条件は、各樹脂種で汎用的に用いられる条件が使用できるが、樹脂温度、金型温度については、好ましくは、汎用条件よりも２０〜３０℃高い条件がよい。また、射出速度、保圧については、好ましくは、汎用条件のそれぞれ４〜６倍、１.２〜２倍がよい。 The resin used is not particularly limited as long as it is a recycled resin. As the molding conditions, the conditions generally used for each resin type can be used, but the resin temperature and mold temperature are preferably higher by 20 to 30 ° C. than the general conditions. In addition, the injection speed and pressure holding are preferably 4 to 6 times and 1.2 to 2 times the general-purpose conditions, respectively.
次に、本発明を、実施例１〜６および比較例１〜１７を用いて、詳しく説明する。ただし、本発明は、これらの実施例に限定されるものではなく、上述した実施の形態１〜６の中で示した数値条件を満足すれば、同様の効果を得ることができ、特許請求の範囲の記載と均等の意味および範囲内でのすべての変更が含まれるものである。 Next, this invention is demonstrated in detail using Examples 1-6 and Comparative Examples 1-17. However, the present invention is not limited to these examples, and the same effect can be obtained as long as the numerical conditions shown in the first to sixth embodiments are satisfied. It is intended to include all modifications within the meaning and range equivalent to the description of the range.
（実施例１）
少量の異物を含む再生ポリプロピレン樹脂を用い、Ｖ字形状の突起を設けた成形品を作製した。このとき、Ｖ字形状のＶ字底辺の長さは、Ｌ＝５１μｍ、高さは、Ｈ＝５１μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、１個であった。
Example 1
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with V-shaped protrusions was produced. At this time, the length of the V-shaped bottom of the V-shape was L = 51 μm and the height was H = 51 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was one.
（比較例１）
少量の異物を含む再生ポリプロピレン樹脂を用い、Ｖ字形状の突起を設けた成形品を作製した。このとき、Ｖ字形状のＶ字底辺の長さは、Ｌ＝４９μｍ、高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、５個であった。
(Comparative Example 1)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with V-shaped protrusions was produced. At this time, the length of the V-shaped V-shaped base was L = 49 μm, and the height was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was five.
（比較例２）
少量の異物を含む再生ポリプロピレン樹脂を用い、Ｖ字形状の突起を設けた成形品を作製した。このとき、Ｖ字形状のＶ字底辺の長さは、Ｌ＝５２μｍ、高さは、Ｈ＝５１μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、８個であった。
(Comparative Example 2)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with V-shaped protrusions was produced. At this time, the length of the V-shaped V-shaped base was L = 52 μm, and the height was H = 51 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was eight.
（比較例３）
少量の異物を含む再生ポリプロピレン樹脂を用い、Ｖ字形状の突起を設けた成形品を作製した。このとき、Ｖ字形状のＶ字底辺の長さは、Ｌ＝５１μｍ、高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、１０個であった。
(Comparative Example 3)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with V-shaped protrusions was produced. At this time, the length of the V-shaped V-shaped base was L = 51 μm, and the height was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was 10.
（実施例２）
少量の異物を含む再生ポリプロピレン樹脂を用い、三角錐形状の突起を設けた成形品を作製した。このとき、三角錐底面の三角形の長辺に対する頂点から長辺に下ろした垂線の長さは、Ｌ＝５１μｍ、三角錐の高さは、Ｈ＝５１μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、２個であった。
(Example 2)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with triangular pyramid-shaped protrusions was produced. At this time, the length of the perpendicular line extending from the apex to the long side of the triangle on the bottom of the triangular pyramid was L = 51 μm, and the height of the triangular pyramid was H = 51 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was two.
（比較例４）
少量の異物を含む再生ポリプロピレン樹脂を用い、三角錐形状の突起を設けた成形品を作製した。このとき、三角錐底面の三角形の長辺に対する頂点から長辺に下ろした垂線の長さは、Ｌ＝４９μｍ、三角錐の高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、５個であった。
(Comparative Example 4)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with triangular pyramid-shaped protrusions was produced. At this time, the length of the perpendicular line extending from the apex to the long side of the triangle on the bottom of the triangular pyramid was L = 49 μm, and the height of the triangular pyramid was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was five.
（比較例５）
少量の異物を含む再生ポリプロピレン樹脂を用い、三角錐形状の突起を設けた成形品を作製した。このとき、三角錐底面の三角形の長辺に対する頂点から長辺に下ろした垂線の長さは、Ｌ＝５２μｍ、三角錐の高さは、Ｈ＝５１μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、７個であった。
(Comparative Example 5)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with triangular pyramid-shaped protrusions was produced. At this time, the length of the perpendicular line extending from the apex to the long side of the triangular pyramid bottom was L = 52 μm, and the height of the triangular pyramid was H = 51 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was seven.
（比較例６）
少量の異物を含む再生ポリプロピレン樹脂を用い、三角錐形状の突起を設けた成形品を作製した。このとき、三角錐底面の三角形の長辺に対する頂点から長辺に下ろした垂線の長さは、Ｌ＝５１μｍ、三角錐の高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、１２個であった。
(Comparative Example 6)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with triangular pyramid-shaped protrusions was produced. At this time, the length of the perpendicular line extending from the apex to the long side of the triangle at the bottom of the triangular pyramid was L = 51 μm, and the height of the triangular pyramid was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was 12.
（実施例３）
少量の異物を含む再生ポリプロピレン樹脂を用い、四角錘形状の突起を設けた成形品を作製した。このとき、四角錘底面の四角形の２本の対角線の内、長い方の対角線の長さは、Ｌ＝５１μｍ、四角錘の高さは、Ｈ＝５１μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、２個であった。
(Example 3)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with quadrangular pyramid-shaped protrusions was produced. At this time, the length of the longer diagonal line out of the two diagonal lines on the square pyramidal bottom surface was L = 51 μm, and the height of the square weight was H = 51 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was two.
（比較例７）
少量の異物を含む再生ポリプロピレン樹脂を用い、四角錘形状の突起を設けた成形品を作製した。このとき、四角錘底面の四角形の２本の対角線の内、長い方の対角線の長さは、Ｌ＝４９μｍ、四角錘の高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、６個であった。
(Comparative Example 7)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with quadrangular pyramid-shaped protrusions was produced. At this time, the length of the longer diagonal line out of the two diagonal lines on the square pyramidal bottom surface was L = 49 μm, and the height of the square weight was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was six.
（比較例８）
少量の異物を含む再生ポリプロピレン樹脂を用い、四角錘形状の突起を設けた成形品を作製した。このとき、四角錘底面の四角形の２本の対角線の内、長い方の対角線の長さは、Ｌ＝５２μｍ、四角錘の高さは、Ｈ＝５１μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、７個であった。
(Comparative Example 8)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with quadrangular pyramid-shaped protrusions was produced. At this time, the length of the longer diagonal line of the two diagonal lines on the bottom of the square weight was L = 52 μm, and the height of the square weight was H = 51 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was seven.
（比較例９）
少量の異物を含む再生ポリプロピレン樹脂を用い、四角錘形状の突起を設けた成形品を作製した。このとき、四角錘底面の四角形の２本の対角線の内、長い方の対角線の長さは、Ｌ＝５１μｍ、四角錘の高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、９個であった。
(Comparative Example 9)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with quadrangular pyramid-shaped protrusions was produced. At this time, the length of the longer diagonal line out of the two diagonal lines on the bottom of the quadrangular pyramid was L = 51 μm, and the height of the quadrangular pyramid was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was nine.
（実施例４）
少量の異物を含む再生ポリプロピレン樹脂を用い、矩形形状の突起を設けた成形品を作製した。このとき、矩形形状の長さは、Ｌ＝５１μｍ、平坦部の長さは、Ｌ’＝４９μｍ、矩形の高さは、Ｈ＝５１μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、０個であった。
Example 4
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with rectangular protrusions was produced. At this time, the length of the rectangular shape was L = 51 μm, the length of the flat portion was L ′ = 49 μm, and the height of the rectangle was H = 51 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was zero.
（比較例１０）
少量の異物を含む再生ポリプロピレン樹脂を用い、矩形形状の突起を設けた成形品を作製した。このとき、矩形形状の長さは、Ｌ＝５０μｍ、平坦部の長さは、Ｌ’＝４９μｍ、矩形の高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、６個であった。
(Comparative Example 10)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with rectangular protrusions was produced. At this time, the length of the rectangular shape was L = 50 μm, the length of the flat portion was L ′ = 49 μm, and the height of the rectangle was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was six.
（比較例１１）
少量の異物を含む再生ポリプロピレン樹脂を用い、矩形形状の突起を設けた成形品を作製した。このとき、矩形形状の長さは、Ｌ＝５１μｍ、平坦部の長さは、Ｌ’＝４９μｍ、矩形の高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、７個であった。
(Comparative Example 11)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with rectangular protrusions was produced. At this time, the length of the rectangular shape was L = 51 μm, the length of the flat portion was L ′ = 49 μm, and the height of the rectangle was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was seven.
（比較例１２）
少量の異物を含む再生ポリプロピレン樹脂を用い、矩形形状の突起を設けた成形品を作製した。このとき、矩形形状の長さは、Ｌ＝５１μｍ、平坦部の長さは、Ｌ’＝５０μｍ、矩形の高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、１２個であった。
(Comparative Example 12)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product provided with rectangular protrusions was produced. At this time, the length of the rectangular shape was L = 51 μm, the length of the flat portion was L ′ = 50 μm, and the height of the rectangle was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was 12.
（実施例５）
少量の異物を含む再生ポリプロピレン樹脂を用い、表面に２次元的に矩形形状の突起を設けた成形品を作製した。このとき、矩形側面に沿った方向の矩形形状の長さは、Ｌ＝５１μｍ、平坦部の長さは、Ｌ’＝４９μｍ、矩形側面に沿った方向と垂直方向の矩形形状長さは、Ｍ＝５１μｍ、平坦部の長さは、Ｍ’＝４９μｍ、矩形の高さは、Ｈ＝５１μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、０個であった。
(Example 5)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product having a two-dimensional rectangular projection on the surface was produced. At this time, the length of the rectangular shape in the direction along the rectangular side surface is L = 51 μm, the length of the flat portion is L ′ = 49 μm, and the length of the rectangular shape in the direction perpendicular to the direction along the rectangular side surface is M = 51 μm, the length of the flat part was M ′ = 49 μm, and the height of the rectangle was H = 51 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was zero.
（比較例１３）
少量の異物を含む再生ポリプロピレン樹脂を用い、表面に２次元的に矩形形状の突起を設けた成形品を作製した。このとき、矩形側面に沿った方向の矩形形状の長さは、Ｌ＝４９μｍ、平坦部の長さは、Ｌ’＝４９μｍ、矩形側面に沿った方向と垂直方向の矩形形状長さは、Ｍ＝４９μｍ、平坦部の長さは、Ｍ’＝４９μｍ、矩形の高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、５個であった。
(Comparative Example 13)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product having a two-dimensional rectangular projection on the surface was produced. At this time, the length of the rectangular shape in the direction along the rectangular side surface is L = 49 μm, the length of the flat portion is L ′ = 49 μm, and the rectangular shape length in the direction perpendicular to the direction along the rectangular side surface is M = 49 μm, the length of the flat part was M ′ = 49 μm, and the height of the rectangle was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was five.
（比較例１４）
少量の異物を含む再生ポリプロピレン樹脂を用い、表面に２次元的に矩形形状の突起を設けた成形品を作製した。このとき、矩形側面に沿った方向の矩形形状の長さは、Ｌ＝５２μｍ、平坦部の長さは、Ｌ’＝５０μｍ、矩形側面に沿った方向と垂直方向の矩形形状長さは、Ｍ＝５１μｍ、平坦部の長さは、Ｍ’＝４９μｍ、矩形の高さは、Ｈ＝５１μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、９個であった。
(Comparative Example 14)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product having a two-dimensional rectangular projection on the surface was produced. At this time, the length of the rectangular shape in the direction along the rectangular side surface is L = 52 μm, the length of the flat portion is L ′ = 50 μm, and the rectangular shape length in the direction perpendicular to the direction along the rectangular side surface is M = 51 μm, the length of the flat part was M ′ = 49 μm, and the height of the rectangle was H = 51 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was nine.
（比較例１５）
少量の異物を含む再生ポリプロピレン樹脂を用い、表面に２次元的に矩形形状の突起を設けた成形品を作製した。このとき、矩形側面に沿った方向の矩形形状の長さは、Ｌ＝５２μｍ、平坦部の長さは、Ｌ’＝５０μｍ、矩形側面に沿った方向と垂直方向の矩形形状長さは、Ｍ＝５２μｍ、平坦部の長さは、Ｍ’＝５０μｍ、矩形の高さは、Ｈ＝５０μｍであった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、１３個であった。
(Comparative Example 15)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product having a two-dimensional rectangular projection on the surface was produced. At this time, the length of the rectangular shape in the direction along the rectangular side surface is L = 52 μm, the length of the flat portion is L ′ = 50 μm, and the rectangular shape length in the direction perpendicular to the direction along the rectangular side surface is M = 52 μm, the length of the flat portion was M ′ = 50 μm, and the height of the rectangle was H = 50 μm. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was 13.
（実施例６）
少量の異物を含む再生ポリプロピレン樹脂を用い、表面にシボ形状を設けた成形品を作製した。このとき、表面形状測定データのフーリエ変換を行った結果、波数Ｋ＝２.６において、高さＴ＝５１μｍのピークが見られた。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、２個であった。
(Example 6)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product having a textured shape on the surface was produced. At this time, as a result of Fourier transform of the surface shape measurement data, a peak with a height T = 51 μm was observed at a wave number K = 2.6. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was two.
（比較例１６）
少量の異物を含む再生ポリプロピレン樹脂を用い、表面にシボ形状を設けた成形品を作製した。このとき、表面形状測定データのフーリエ変換を行った結果、波数Ｋ＝２.４において、高さＴ＝５１μｍのピークが見られた。また、それ以上の波数には、高さ５０を超えるピークが見られなかった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、６個であった。
(Comparative Example 16)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product having a textured shape on the surface was produced. At this time, as a result of performing Fourier transform of the surface shape measurement data, a peak with a height T = 51 μm was observed at a wave number K = 2.4. Further, no peak exceeding the height of 50 was observed at higher wave numbers. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was six.
（比較例１７）
少量の異物を含む再生ポリプロピレン樹脂を用い、表面にシボ形状を設けた成形品を作製した。このとき、表面形状測定データのフーリエ変換を行った結果、高さ５０μｍを超えるピークが見られなかった。得られた成形品の表面目視観察を行い、表面から視認できる異物数を測定した結果、５０ｃｍ四方に含まれる異物数は、９個であった。
(Comparative Example 17)
Using a recycled polypropylene resin containing a small amount of foreign matter, a molded product having a textured shape on the surface was produced. At this time, as a result of Fourier transform of the surface shape measurement data, no peak exceeding 50 μm in height was observed. As a result of visual observation of the surface of the obtained molded product and measuring the number of foreign matters visible from the surface, the number of foreign matters contained in a 50 cm square was nine.
表１は、本発明の実施の形態１における実施例１〜６および比較例１〜１７の結果をまとめた一覧表である。 Table 1 is a list summarizing the results of Examples 1 to 6 and Comparative Examples 1 to 17 in Embodiment 1 of the present invention.
表１から分かるように、５０ｃｍ四方に含まれる異物数が、実施例１〜６の条件においては２個以内に収まっているのに対し、比較例１〜１７の条件においては５個以上となっている。この結果、実施例１〜６に示した条件設定とすることで、異物の視認性を低下させることが可能となることがわかる。 As can be seen from Table 1, the number of foreign matters contained in a 50 cm square is within 2 in the conditions of Examples 1 to 6, whereas it is 5 or more in the conditions of Comparative Examples 1 to 17. ing. As a result, it can be seen that the visibility of the foreign matter can be reduced by setting the conditions shown in Examples 1 to 6.
以上のように、実施の形態１〜６によれば、成形品表面に、所定の数値条件を満たすような微細な凹凸形状を転写することにより、再生樹脂中に含まれる異物の成形品表面への露出を低減することができる。この結果、追加の溶融混練や、添加剤の使用なしに、再生樹脂成形品中の異物の視認性を低下させることのできる再生樹脂成形品を得ることができる。 As described above, according to the first to sixth embodiments, by transferring a fine uneven shape that satisfies a predetermined numerical condition to the surface of the molded product, the surface of the foreign matter contained in the recycled resin is transferred. Exposure can be reduced. As a result, it is possible to obtain a recycled resin molded product that can reduce the visibility of foreign matters in the recycled resin molded product without additional melt-kneading or using additives.
Claims (6)
金型を用いて成形対象となる成形品表面に微細な凹凸形状を転写させることで異物の露出を低減させる転写ステップを備え、
前記転写ステップにより前記成型品表面に形成された微細な凹凸形状は、Ｖ字形状を有し、前記Ｖ字形状の底辺の長さＬ（μｍ）と高さＨ（μｍ）の関係が
Ｈ＞５０μｍ、かつＨ≧Ｌ
である
ことを特徴とする再生樹脂成形品の製造方法。 A method for producing a recycled resin molded article using a recycled resin containing foreign matter,
With a transfer step that reduces the exposure of foreign matter by transferring fine irregularities on the surface of the molded product to be molded using a mold,
The fine concavo-convex shape formed on the surface of the molded product by the transfer step has a V shape, and the relationship between the length L (μm) and the height H (μm) of the bottom of the V shape is H> 50 μm and H ≧ L
A method for producing a recycled resin molded product, characterized in that
金型を用いて成形対象となる成形品表面に微細な凹凸形状を転写させることで異物の露出を低減させる転写ステップを備え、
前記転写ステップにより前記成型品表面に形成された微細な凹凸形状は、三角錐形状を有し、前記三角錐底面の三角形の長辺に対する頂点から長辺に下ろした垂線の長さＬ（μｍ）と三角錐の高さＨ（μｍ）の関係が
Ｈ＞５０μｍ、かつＨ≧Ｌ
である
ことを特徴とする再生樹脂成形品の製造方法。 A method for producing a recycled resin molded article using a recycled resin containing foreign matter,
With a transfer step that reduces the exposure of foreign matter by transferring fine irregularities on the surface of the molded product to be molded using a mold,
The fine concavo-convex shape formed on the surface of the molded product by the transfer step has a triangular pyramid shape, and the length L (μm) of a perpendicular line extending from the apex to the long side of the triangular pyramid base on the long side. And the height H (μm) of the triangular pyramid is H> 50 μm and H ≧ L
A method for producing a recycled resin molded product, characterized in that
金型を用いて成形対象となる成形品表面に微細な凹凸形状を転写させることで異物の露出を低減させる転写ステップを備え、
前記転写ステップにより前記成型品表面に形成された微細な凹凸形状は、四角錐形状を有し、前記四角錘底面の四角形の２本の対角線の内、長い方の対角線の長さＬ（μｍ）と四角錘の高さＨ（μｍ）の関係が
Ｈ＞５０μｍ、かつＨ≧Ｌ
である
ことを特徴とする再生樹脂成形品の製造方法。 A method for producing a recycled resin molded article using a recycled resin containing foreign matter,
With a transfer step that reduces the exposure of foreign matter by transferring fine irregularities on the surface of the molded product to be molded using a mold,
The fine concavo-convex shape formed on the surface of the molded product by the transfer step has a quadrangular pyramid shape, and the length L (μm) of the longer diagonal line out of the two diagonal lines on the square pyramid bottom surface. And the height H (μm) of the square pyramid is H> 50 μm and H ≧ L
A method for producing a recycled resin molded product, characterized in that
金型を用いて成形対象となる成形品表面に微細な凹凸形状を転写させることで異物の露出を低減させる転写ステップを備え、
前記転写ステップにより前記成型品表面に形成された微細な凹凸形状は、矩形形状を有し、前記矩形形状の長さＬ（μｍ）と平坦部の長さＬ’（μｍ）と矩形の高さＨ（μｍ）の関係が
Ｈ＞５０μｍ、かつＨ≧Ｌ、かつ Ｌ’＜５０μｍ
である
ことを特徴とする再生樹脂成形品の製造方法。 A method for producing a recycled resin molded article using a recycled resin containing foreign matter,
With a transfer step that reduces the exposure of foreign matter by transferring fine irregularities on the surface of the molded product to be molded using a mold,
The fine concavo-convex shape formed on the surface of the molded product by the transfer step has a rectangular shape, the length L (μm) of the rectangular shape, the length L ′ (μm) of the flat portion, and the height of the rectangle. The relationship of H (μm) is H> 50 μm, H ≧ L, and L ′ <50 μm
A method for producing a recycled resin molded product, characterized in that
金型を用いて成形対象となる成形品表面に微細な凹凸形状を転写させることで異物の露出を低減させる転写ステップを備え、
前記転写ステップにより前記成型品表面に形成された微細な凹凸形状は、矩形形状突起が二次元的に分布した形状を有し、矩形側面に沿った方向の前記矩形形状の長さＬ（μｍ）と平坦部の長さＬ’（μｍ）、前記矩形側面に沿った方向と垂直方向の矩形形状の長さＭ（μｍ）と平坦部の長さＭ’（μｍ）、矩形の高さＨ（μｍ）の関係が
Ｈ＞５０μｍ、かつＨ≧Ｌ、Ｍ、かつ Ｌ’、Ｍ’＜５０μｍ
である
ことを特徴とする再生樹脂成形品の製造方法。 A method for producing a recycled resin molded article using a recycled resin containing foreign matter,
With a transfer step that reduces the exposure of foreign matter by transferring fine irregularities on the surface of the molded product to be molded using a mold,
The fine concavo-convex shape formed on the surface of the molded product by the transfer step has a shape in which rectangular protrusions are two-dimensionally distributed, and the length L (μm) of the rectangular shape in the direction along the rectangular side surface. And the length L ′ (μm) of the flat portion, the length M (μm) of the rectangular shape in the direction perpendicular to the rectangular side surface, the length M ′ (μm) of the flat portion, and the height H ( μm) is H> 50 μm, and H ≧ L, M, and L ′, M ′ <50 μm
A method for producing a recycled resin molded product, characterized in that
金型を用いて成形対象となる成形品表面に微細な凹凸形状を転写させることで異物の露出を低減させる転写ステップを備え、
前記転写ステップにより前記成型品表面に形成された微細な凹凸形状は、不定形のシボ形状を有し、成形品表面形状測定値のフーリエ変換より得られる横軸が波数Ｋ（ｍ−１）、縦軸が振幅の二乗Ｈ（μｍ２）のスペクトルにおいて、Ｋ＞２．５ｍ−１の波数にＨ＞５０μｍ２のピークを有する
ことを特徴とする再生樹脂成形品の製造方法。 A method for producing a recycled resin molded article using a recycled resin containing foreign matter,
With a transfer step that reduces the exposure of foreign matter by transferring fine irregularities on the surface of the molded product to be molded using a mold,
The fine concavo-convex shape formed on the surface of the molded product by the transfer step has an irregular shape, and the horizontal axis obtained from the Fourier transform of the measured value of the molded product surface shape has a wavenumber K (m −1 ), A method for producing a recycled resin molded article, wherein the vertical axis has a peak of H> 50 μm 2 at a wave number of K> 2.5 m −1 in a spectrum of amplitude squared H (μm 2 ).
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