JP6201135B2 - Sandwich molding method for plastic molded products - Google Patents
Sandwich molding method for plastic molded products Download PDFInfo
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- JP6201135B2 JP6201135B2 JP2012063871A JP2012063871A JP6201135B2 JP 6201135 B2 JP6201135 B2 JP 6201135B2 JP 2012063871 A JP2012063871 A JP 2012063871A JP 2012063871 A JP2012063871 A JP 2012063871A JP 6201135 B2 JP6201135 B2 JP 6201135B2
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- 238000000465 moulding Methods 0.000 title claims description 30
- 238000000034 method Methods 0.000 title claims description 29
- 229920003023 plastic Polymers 0.000 title claims description 27
- 239000004033 plastic Substances 0.000 title claims description 27
- 239000011342 resin composition Substances 0.000 claims description 37
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 36
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 36
- 241001330002 Bambuseae Species 0.000 claims description 36
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 36
- 239000011425 bamboo Substances 0.000 claims description 36
- 239000000835 fiber Substances 0.000 claims description 34
- 239000012792 core layer Substances 0.000 claims description 26
- 239000010410 layer Substances 0.000 claims description 26
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 23
- 239000004626 polylactic acid Substances 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000010137 moulding (plastic) Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000011511 Diospyros Nutrition 0.000 description 2
- 244000236655 Diospyros kaki Species 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- -1 or if necessary Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 240000000491 Corchorus aestuans Species 0.000 description 1
- 235000011777 Corchorus aestuans Nutrition 0.000 description 1
- 235000010862 Corchorus capsularis Nutrition 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000013076 target substance Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Description
本発明は、スキン層とコア層とを有するプラスチック成形品のサンドイッチ成形方法に関する。 The present invention relates to a sandwich molding method for a plastic molded article having a skin layer and a core layer.
近年、竹林の拡大とそれに伴う森林の荒廃が問題となる中で、全国各地で竹林の整備や拡大・侵入防止策、また竹林や竹材の有効利用についての様々な取り組みが行われているが、整備後などに生ずる竹廃材の有効な利用策が講じられていないのが実情である。また、石油資源の枯渇が予想される状況下、プラスチック材料を焼却廃棄する際の有害ガスの発生を抑制する観点から、石油資源を原料とするプラスチック材料の使用量も、できるだけ減らす必要がある。 In recent years, the expansion of bamboo forests and the accompanying devastation of forests has become a problem. The actual situation is that no effective measures have been taken for the waste bamboo material generated after maintenance. In addition, in a situation where petroleum resources are expected to be exhausted, it is necessary to reduce as much as possible the amount of plastic material used as a raw material for petroleum resources, from the viewpoint of suppressing the generation of harmful gases when plastic materials are incinerated and discarded.
下記特許文献１では、同一スプルーを経てスキン層となる樹脂と、コア層となる樹脂をキャビティ内に連続的に射出するサンドイッチ成形方法が記載されている。しかしながら、かかる特許文献では成形品のキャビティ面のゲート正面部に対応するスキン層の肉厚を十分に確保するため、コア層となる樹脂として流れの良好なものを使用する必要があり、竹繊維などの非溶融物をコア層に含有する成形品を製造するための条件検討はされていない。 In Patent Document 1 described below, a sandwich molding method is described in which a resin serving as a skin layer and a resin serving as a core layer are continuously injected into a cavity through the same sprue. However, in such a patent document, in order to ensure a sufficient thickness of the skin layer corresponding to the gate front portion of the cavity surface of the molded product, it is necessary to use a resin having a good flow as the resin serving as the core layer. The conditions for producing a molded product containing a non-melted material such as the above in the core layer have not been studied.
なお、下記特許文献２では、竹繊維を含有する繊維層と樹脂層とを有する食器が記載されているが、かかる食器をサンドイッチ成形方法にて製造する技術が記載されているわけではない。 In addition, although the following patent document 2 describes the tableware which has a fiber layer containing a bamboo fiber and a resin layer, the technique which manufactures this tableware by a sandwich molding method is not described.
本発明は上記実情に鑑みてなされたものであり、その目的は、廃棄の際にも環境に優しく、かつ竹資源の有効活用が可能で、美観に優れ、耐久性に優れたプラスチック成形品のサンドイッチ成形方法を提供することにある。 The present invention has been made in view of the above circumstances, and its purpose is to produce a plastic molded product that is environmentally friendly even when disposed of, can effectively use bamboo resources, has good aesthetics, and has excellent durability. It is to provide a sandwich molding method.
上記目的は、下記の如き本発明により達成できる。即ち本発明は、スキン層とコア層とを有するプラスチック成形品のサンドイッチ成形方法であって、ポリ乳酸を主成分として含有する第１樹脂組成物をキャビティ内に射出して前記スキン層を形成する第１工程と、竹繊維とポリ乳酸とを含有する第２樹脂組成物を前記キャビティ内に射出して前記コア層を形成する第２工程とを少なくとも有することを特徴とするプラスチック成形品のサンドイッチ成形方法、に関する。 The above object can be achieved by the present invention as described below. That is, the present invention is a sandwich molding method of a plastic molded article having a skin layer and a core layer, and the skin layer is formed by injecting a first resin composition containing polylactic acid as a main component into a cavity. A plastic molded article sandwich comprising at least a first step and a second step of injecting a second resin composition containing bamboo fiber and polylactic acid into the cavity to form the core layer The present invention relates to a molding method.
上記成形方法においては、サンドイッチ成形方法により、竹繊維とポリ乳酸とを含有するコア層を、ポリ乳酸を主成分とするスキン層により包み込んだプラスチック成形品を製造する。竹繊維およびポリ乳酸のいずれもカーボンニュートラルな原料であって、地球温暖化の原因とされる二酸化炭素の量を増やすことがない。さらに、竹繊維とポリ乳酸とを含有するコア層がポリ乳酸を主成分とするスキン層により確実に覆い隠されるため、例えばプラスチック成形品が水と接触する場合でも竹繊維の膨潤・劣化を防止し、かつ微小な竹繊維が突出することや成形時の熱履歴による竹繊維の焼け、分解に伴う外観不良も低減することができる。 In the molding method described above, a plastic molded article in which a core layer containing bamboo fibers and polylactic acid is wrapped with a skin layer containing polylactic acid as a main component is manufactured by a sandwich molding method. Both bamboo fiber and polylactic acid are carbon-neutral raw materials and do not increase the amount of carbon dioxide that causes global warming. In addition, the core layer containing bamboo fiber and polylactic acid is surely covered with a skin layer mainly composed of polylactic acid, so that swelling and deterioration of bamboo fiber are prevented even when plastic molded products come into contact with water, for example. In addition, it is possible to reduce appearance defects due to the protrusion of minute bamboo fibers and the burning and decomposition of bamboo fibers due to the heat history during molding.
なお、スキン層とコア層とを有するプラスチック成形品において、コア層の露出をより確実に防止する方法として、プラスチック成形品を塗装する方法が挙げられるが、かかる塗装工程を設ける場合は、塗装の剥離に起因した安全性の問題や、塗装の耐熱性に限界があること、さらには塗装によるコストアップなどの問題がある。しかしながら、本発明に係る成形方法により得られたプラスチック成形品では、竹繊維とポリ乳酸とを含有するコア層が、ポリ乳酸を主成分とするスキン層により、確実に覆い隠されるため、塗装の省略、あるいは塗装量の低減が可能となる。その結果、耐熱性に優れ、コスト低減が可能であって、かつ安全性に優れたプラスチック成形品が得られる。 In addition, in a plastic molded product having a skin layer and a core layer, as a method for more reliably preventing the exposure of the core layer, there is a method of coating the plastic molded product. There are safety problems due to peeling, limited heat resistance of coating, and problems such as cost increase due to coating. However, in the plastic molded product obtained by the molding method according to the present invention, the core layer containing bamboo fiber and polylactic acid is surely covered by the skin layer containing polylactic acid as a main component. Omission or reduction of coating amount is possible. As a result, a plastic molded article having excellent heat resistance, cost reduction, and excellent safety can be obtained.
上記成形方法において、前記第２樹脂組成物中の前記竹繊維の含有量が、５１重量％以上であることが好ましい。かかる構成によれば、プラスチック成形品中の竹繊維の含有量がより多くなるため、竹資源のさらなる有効活用が可能となる。 In the molding method, the bamboo fiber content in the second resin composition is preferably 51% by weight or more. According to such a configuration, the content of bamboo fiber in the plastic molded product is increased, so that more effective utilization of bamboo resources is possible.
上記成形方法において、前記プラスチック成形品が食器であることが好ましい。一般に、食器は製品厚みが薄く、かつ水と接する機会も多いが、上記成形方法によれば、製品厚みが薄くても竹繊維の露出量を著しく低減できるため、耐水性などの耐久性がさらに向上し、かつ美観に優れる。 In the molding method, the plastic molded product is preferably tableware. In general, tableware has a thin product thickness and many opportunities to come into contact with water. However, according to the above molding method, the exposed amount of bamboo fiber can be significantly reduced even if the product thickness is thin. Improves and is aesthetically pleasing.
上記成形方法において、前記キャビティ内での前記第１樹脂組成物と前記第２樹脂組成物との充填比率が、容積換算で１：０．２〜１：２．０であることが好ましい。スキン層を形成する第１樹脂組成物と、コア層を形成し、竹繊維を含有することにより流動性が低下した第２樹脂組成物とを、かかる充填比率に設定することにより、コア層がスキン層を突き破るブレイクスルー現象を生じることなく、より多くの竹繊維を充てんさせたプラスチック成形品を製造することができる。 In the molding method, it is preferable that a filling ratio of the first resin composition and the second resin composition in the cavity is 1: 0.2 to 1: 2.0 in terms of volume. By setting the first resin composition forming the skin layer and the second resin composition forming the core layer and having the fluidity lowered by containing bamboo fibers, the core layer is A plastic molded article filled with more bamboo fibers can be produced without causing a breakthrough phenomenon that breaks through the skin layer.
上記成形方法において、前記キャビティ内への射出開始から、前記第１樹脂組成物の充填時間が０．３〜４．０秒であり、前記第２樹脂組成物の充填時間が０．３〜３．０秒であることが好ましい。各々の充填時間をかかる範囲内に設定することにより、スキン層の硬化タイミングとコア層の冷却固化タイミングとを最適化することができ、コア層がスキン層を突き破るブレイクスルー現象を生じることなく、より多くの竹繊維を充てんさせたプラスチック成形品を製造することができる。 In the molding method, the filling time of the first resin composition is 0.3 to 4.0 seconds from the start of injection into the cavity, and the filling time of the second resin composition is 0.3 to 3 0.0 second is preferable. By setting each filling time within such a range, the hardening timing of the skin layer and the cooling and solidification timing of the core layer can be optimized, without causing a breakthrough phenomenon that the core layer breaks through the skin layer, A plastic molded article filled with more bamboo fibers can be produced.
本発明のプラスチック成形品のサンドイッチ成形方法は、第１樹脂組成物をキャビティ内に射出してスキン層を形成する第１工程と、第２樹脂組成物をキャビティ内に射出してコア層を形成する第２工程とを少なくとも有する。 The plastic molding product sandwich molding method of the present invention includes a first step in which a first resin composition is injected into a cavity to form a skin layer, and a second resin composition is injected into the cavity to form a core layer. And at least a second step.
第１樹脂組成物は、ポリ乳酸を主成分として含有し、具体的にはポリ乳酸を９０重量％以上含有し、好ましくは９５％以上含有し、より好ましくは９９％以上含有する。必要に応じて、第１樹脂組成物中に酸化チタンなどの着色剤や、カーボンブラックなどの充填剤、さらにはポリ乳酸と共に射出成形可能な各種プラスチック材料を配合することができる。 The first resin composition contains polylactic acid as a main component. Specifically, the first resin composition contains 90% by weight or more, preferably 95% or more, and more preferably 99% or more. If necessary, a colorant such as titanium oxide, a filler such as carbon black, and various plastic materials that can be injection-molded together with polylactic acid can be blended in the first resin composition.
第２樹脂組成物は、竹繊維とポリ乳酸とを含有し、具体的には竹繊維を３０％以上含有し、好ましくは５１％以上含有する。竹繊維以外の成分として、全てをポリ乳酸としても良く、あるいは必要に応じて、酸化チタンなどの着色剤や、カーボンブラックなどの充填剤、さらにはポリ乳酸と共に射出成形可能な各種プラスチック材料を配合することができる。 The second resin composition contains bamboo fiber and polylactic acid, specifically contains bamboo fiber at 30% or more, preferably 51% or more. As components other than bamboo fiber, all may be polylactic acid, or if necessary, colorants such as titanium oxide, fillers such as carbon black, and various plastic materials that can be injection molded with polylactic acid. can do.
竹繊維は、竹を原料として当業者に公知の手法、例えば爆砕処理などにより得ることができる。爆砕処理によって得られた竹繊維は、ジュート繊維等に比べ、ヤング率が熱影響を受けにくいという特徴を有するので、例えば給食用食器のように食器洗い機で長時間高温に晒される用途においては特に好ましい。ここで「爆砕」は、高温高圧水蒸気下に対象物質を一定時間保持した後、圧力を瞬時に解放することにより物質成分を分解する手段をいう。例えば、竹繊維を含有する食器を成型した場合、竹繊維はポーラスであり、かつ繊維間の空隙に含まれる空気で成形後も多数の気泡が形成されるため、断熱性を高めることができ、例えば竹繊維を含有する食器とした場合、高い保温性を有する。また、この断熱性から、食器に盛った食品温度に応じて食器（特に縁部分）が極端に熱くなったり冷たくなることもなく、持ち運びも容易となる。 Bamboo fiber can be obtained from bamboo as a raw material by a method known to those skilled in the art, for example, explosion treatment. Bamboo fiber obtained by blasting treatment has a feature that Young's modulus is less susceptible to heat compared to jute fiber, etc., especially in applications that are exposed to high temperatures for a long time in a dishwasher, such as a tableware for lunch preferable. Here, “explosion” refers to means for decomposing a substance component by holding the target substance under high-temperature and high-pressure steam for a certain period of time and then immediately releasing the pressure. For example, when molding tableware containing bamboo fiber, the bamboo fiber is porous, and a large number of bubbles are formed after molding with air contained in the gaps between the fibers, so that the heat insulation can be improved, For example, when it is set as the tableware containing a bamboo fiber, it has high heat retention. In addition, because of this heat insulating property, the tableware (particularly the edge portion) does not become extremely hot or cold according to the food temperature accumulated in the tableware, and is easy to carry.
本発明において、成形可能なプラスチック成形品の形状は、任意の厚み・大きさに設計可能であり、具体的には例えば、食器、玩具、厨房備品、家庭用品などが挙げられる。特に本発明は、製品厚みが薄くても竹繊維の露出量が著しく低減されたプラスチック成形品が製造可能であるため、製品厚みが薄く（例えば１〜５ｍｍ、より好ましくは２〜４ｍｍ）、かつ水と接する機会が多い食器のサンドイッチ成形方法として特に有用である。また、竹繊維とポリ乳酸とを主成分とする食器は、軽量でありながら十分な強度を備え、耐衝撃性に富み、かつ廃棄処分時の環境負荷も小さい。以下に、プラスチック成形品として、食器を例に挙げてサンドイッチ成形方法について説明する。 In the present invention, the shape of the plastic molded product that can be molded can be designed to have an arbitrary thickness and size. Specific examples include tableware, toys, kitchen equipment, and household items. In particular, since the present invention can produce a plastic molded product in which the exposed amount of bamboo fiber is significantly reduced even if the product thickness is thin, the product thickness is thin (for example, 1 to 5 mm, more preferably 2 to 4 mm), and It is particularly useful as a sandwich molding method for tableware that often comes in contact with water. In addition, the tableware mainly composed of bamboo fiber and polylactic acid is light in weight, has sufficient strength, has high impact resistance, and has a small environmental load at the time of disposal. Hereinafter, a sandwich molding method will be described by taking tableware as an example of a plastic molded product.
図１では、食器の形状に対応するキャビティを有する金型１内に、第１樹脂組成物および第２樹脂組成物を連続的に射出して食器を製造する例を示す。この例ではポリ乳酸を主成分として含有する第１樹脂組成物がシリンダ２に投入され、竹繊維とポリ乳酸とを含有する第２樹脂組成物がシリンダ３に投入されている。 FIG. 1 shows an example in which tableware is manufactured by continuously injecting a first resin composition and a second resin composition into a mold 1 having a cavity corresponding to the shape of tableware. In this example, a first resin composition containing polylactic acid as a main component is put into the cylinder 2, and a second resin composition containing bamboo fiber and polylactic acid is put into the cylinder 3.
まず、スプルーを通って第１樹脂組成物が金型１内のキャビティ内に射出されることで、食器のスキン層が形成される（第１工程）。続いて、連続的に、第２樹脂組成物がスプルーを通って金型１内のキャビティ内に射出されることでコア層が形成される（第２工程）。必要に応じて、第２工程の後に第１樹脂組成物をさらに射出することで、スキン層によりコア層をさらに確実に覆い隠すことができる（第３工程）。 First, a skin layer of tableware is formed by injecting the first resin composition into a cavity in the mold 1 through a sprue (first step). Subsequently, the core layer is formed by continuously injecting the second resin composition into the cavity in the mold 1 through the sprue (second step). If necessary, the core layer can be more reliably covered by the skin layer by further injecting the first resin composition after the second step (third step).
第２工程（または第３工程）後に適宜金型１を冷却し、型開き・製品取り出しを行うことで、食器が得られる。必要に応じて、食器を塗装しても良い。塗装する場合であっても、本発明に係るサンドイッチ成形方法により得られた食器では、スキン層によりコア層が確実に覆い隠されているため、塗装量を最小限に抑えることができ、さらに塗膜強度も著しく向上し、塗膜剥離の問題も解決することができる。 Tableware is obtained by appropriately cooling the mold 1 after the second step (or the third step), and performing mold opening and product removal. If necessary, you may paint tableware. Even in the case of painting, in the tableware obtained by the sandwich molding method according to the present invention, the core layer is reliably covered by the skin layer, so that the amount of painting can be minimized, and further, The film strength is also significantly improved, and the problem of coating film peeling can be solved.
後述する実施例を参照しても明らかなとおり、スキン層によりコア層をより均一に覆い隠すためには、キャビティ内での第１樹脂組成物と第２樹脂組成物との充填比率が、容積換算で１：０．２〜１：２．０であることが好ましく、１：０．５〜１：１．２であることがより好ましく、１：０．６〜１：１であることが特に好ましい。さらに、スキン層の冷却固化タイミングとコア層の冷却固化タイミングとを最適化し、スキン層によりコア層をより均一に覆い隠すためには、キャビティ内への射出開始から、第１樹脂組成物の充填時間が０．３〜４．０秒であり、第２樹脂組成物の充填時間が０．３〜３．０秒であることが好ましく、第１樹脂組成物の充填時間が０．８〜２．０秒であり、第２樹脂組成物の充填時間が０．５〜１．０秒であることがより好ましい。 As is apparent from the examples described later, in order to more uniformly cover the core layer with the skin layer, the filling ratio of the first resin composition and the second resin composition in the cavity is set to a volume. It is preferably 1: 0.2 to 1: 2.0, more preferably 1: 0.5 to 1: 1.2, and 1: 0.6 to 1: 1. Particularly preferred. Furthermore, in order to optimize the cooling and solidification timing of the skin layer and the cooling and solidification timing of the core layer and more uniformly cover the core layer with the skin layer, the filling of the first resin composition is started from the start of injection into the cavity. The time is 0.3 to 4.0 seconds, the filling time of the second resin composition is preferably 0.3 to 3.0 seconds, and the filling time of the first resin composition is 0.8 to 2 0.02 seconds, and the filling time of the second resin composition is more preferably 0.5 to 1.0 seconds.
図１に記載の成形機（日精樹脂工業ＦＮ１０００ １２ＡＤ）を使用し、第１樹脂組成物としてポリ乳酸（「テラマックＴＥ−８００３Ｗ」、ユニチカ社製）１００重量％、第２樹脂組成物として、竹繊維５１重量％、ポリ乳酸（「テラマックＴＥ−８００３Ｗ」、ユニチカ社製）４９重量％を含有するペレットを使用した。表１に実施例１〜６の各食器をサンドイッチ成形した際の成形条件を示す。なお、実施例１では大椀（１４５×６０ｍｍ、厚み１．０〜３．０ｍｍ）、実施例２では小椀（１２８×５５ｍｍ、厚み１．０〜３．０ｍｍ）、実施例３では深皿（１７０×３５ｍｍ、厚み１．０〜３．０ｍｍ）、実施例４では小皿（１４５×３４ｍｍ、厚み１．０〜３．０ｍｍ）、実施例５ではフルーツ皿（１２０×３４ｍｍ、厚み１．０〜３．０ｍｍ）、実施例６ではパン皿（１７０×２５ｍｍ、厚み１．０〜３．０ｍｍ）を製造した例を示す。 Using the molding machine shown in FIG. 1 (Nissei Resin Industry FN1000 12AD), polylactic acid ("Terramac TE-8003W", manufactured by Unitika Ltd.) 100 wt% as the first resin composition, bamboo as the second resin composition Pellets containing 51% by weight of fibers and 49% by weight of polylactic acid (“Terramac TE-8003W”, manufactured by Unitika) were used. Table 1 shows molding conditions when each tableware of Examples 1 to 6 is sandwich-molded. In Example 1, a large bowl (145 × 60 mm, thickness 1.0-3.0 mm), in Example 2, a small bowl (128 × 55 mm, thickness 1.0-3.0 mm), and in Example 3, a deep dish (170 × 35 mm, thickness 1.0-3.0 mm), Example 4 small dish (145 × 34 mm, thickness 1.0-3.0 mm), Example 5 fruit dish (120 × 34 mm, thickness 1.0) -3.0 mm), Example 6 shows an example of producing a pan (170 × 25 mm, thickness 1.0-3.0 mm).
得られた大椀、小椀、深皿、小皿、フルーツ皿およびパン皿のいずれも、竹繊維とポリ乳酸とを含有するコア層が、ポリ乳酸を主成分として含有するスキン層によって、確実に覆い隠されているため、美観に優れ、耐水性などの耐久性にも優れ、コア層がスキン層を突き破るブレイクスルー現象を生じることなく、より多くの竹繊維を充てんさせることができた。 All of the obtained large persimmon, small persimmon, deep dish, small dish, fruit dish and bread dish ensure that the core layer containing bamboo fiber and polylactic acid is a skin layer containing polylactic acid as a main component. Since it is covered and covered, it has excellent aesthetics and durability such as water resistance, and more bamboo fibers can be filled without causing a breakthrough phenomenon in which the core layer breaks through the skin layer.
Claims (4)
ポリ乳酸を主成分として含有する第１樹脂組成物をキャビティ内に射出して前記スキン層を形成する第１工程と、竹繊維とポリ乳酸とを含有する第２樹脂組成物を前記キャビティ内に射出して前記コア層を形成する第２工程とを少なくとも有し、
前記第２樹脂組成物中の前記竹繊維の含有量が、５１重量％以上であることを特徴とするプラスチック成形品のサンドイッチ成形方法。 A sandwich molding method for a plastic molded article having a skin layer and a core layer,
A first step of injecting a first resin composition containing polylactic acid as a main component into the cavity to form the skin layer; and a second resin composition containing bamboo fiber and polylactic acid in the cavity injection to at least have a second step of forming the core layer,
The method for sandwich molding a plastic molded product, wherein the content of the bamboo fiber in the second resin composition is 51% by weight or more .
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