JP4177211B2 - Sandwich injection molded products - Google Patents
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- JP4177211B2 JP4177211B2 JP2003312861A JP2003312861A JP4177211B2 JP 4177211 B2 JP4177211 B2 JP 4177211B2 JP 2003312861 A JP2003312861 A JP 2003312861A JP 2003312861 A JP2003312861 A JP 2003312861A JP 4177211 B2 JP4177211 B2 JP 4177211B2
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- 238000002347 injection Methods 0.000 title claims description 15
- 239000007924 injection Substances 0.000 title claims description 15
- 230000003014 reinforcing effect Effects 0.000 claims description 79
- 238000000465 moulding Methods 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 2
- 239000011347 resin Substances 0.000 description 56
- 229920005989 resin Polymers 0.000 description 56
- 239000011162 core material Substances 0.000 description 28
- 239000004743 Polypropylene Substances 0.000 description 6
- -1 polypropylene Polymers 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000012792 core layer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
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- Containers Having Bodies Formed In One Piece (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
本発明は、サンドイッチ射出成形品に関する。 The present invention relates to a sandwich injection molded article.
石油資源の枯渇化やこれ以上の地球環境の悪化を招かないように、昨今は、不要になった樹脂成形品をそのまま焼却処分するのではなくできるだけリサイクルするように努力されている。 In order to prevent the depletion of petroleum resources and further deterioration of the global environment, efforts are now being made to recycle plastic molded products that are no longer needed rather than incinerating them as they are.
そこで、本発明の発明者らは、たとえば、小さな商品などをまとめて収容するとともに、収容状態で積み上げた状態で搬送できる通い容器として一般に使用されているコンテナと称される樹脂成形品を、サンドイッチ成形法（特許文献１，２等参照）を用いて成形すれば樹脂のリサイクル化が図れるのではないかと考えた。
すなわち、サンドイッチ成形法によれば、表面材として用いることができないリサイクル樹脂材料をコア材として用い、表面となるスキン材をバージンの樹脂等を用いればよいと考えた。
Accordingly, the inventors of the present invention, for example, sandwiched a resin molded product called a container that is generally used as a returnable container that can accommodate small products and the like and can be transported in a stacked state. It was thought that the resin could be recycled by molding using a molding method (see Patent Documents 1 and 2, etc.).
That is, according to the sandwich molding method, it was considered that a recycled resin material that cannot be used as a surface material should be used as a core material, and a virgin resin or the like as a surface skin material.
しかしながら、このサンドイッチ成形方法を用いて、コンテナのような有底箱型容器を成形しようとした場合、つぎのような問題があることがわかった。
すなわち、図７に示すように、コンテナ１００は、底面２００の中央に設けたゲート２１０から樹脂が金型内に射出充填されるようになっているとともにコンテナ１００の縦と横との寸法が異なることが多いが、縦と横との寸法が異なると、ゲート２１０からの距離が近い長側壁３００側の端末の方が、ゲート２１０からの距離が遠い短側壁４００側の端末に比べ、金型内に射出された樹脂が速く到達する。
However, it has been found that there is the following problem when trying to form a bottomed box-type container such as a container using this sandwich molding method.
That is, as shown in FIG. 7, the container 100 is configured such that the resin is injected and filled into the mold from the gate 210 provided in the center of the bottom surface 200, and the vertical and horizontal dimensions of the container 100 are different. In many cases, however, when the vertical and horizontal dimensions are different, the end on the long side wall 300 side that is closer to the gate 210 has a mold than the end on the short side wall 400 side that is far from the gate 210. The resin injected inside reaches quickly.
したがって、図８に示すように、コア層を形成するコア樹脂５００も長側壁３００の中央部の端末まで速く到達してしまうため、リサイクル性を高めようとしてコア樹脂５００の充填割合を増やそうとすると、端末まで速く到達したコア樹脂５００がスキン樹脂６００の層を突き破って表面に露出してしまう。すなわち、外観不良が生じる。
そこで、上記のような問題を解決するために、目的とする成形品形状の主キャビティに隣接してスキン樹脂の逃げとなる副キャビティを設ける方法が既に提案されている（特許文献１，２等参照）。
Therefore, as shown in FIG. 8, since the core resin 500 forming the core layer also reaches the terminal at the center of the long side wall 300 quickly, an attempt is made to increase the filling ratio of the core resin 500 in order to improve recyclability. The core resin 500 that reaches the terminal quickly breaks through the layer of the skin resin 600 and is exposed on the surface. That is, an appearance defect occurs.
Therefore, in order to solve the above-described problems, a method has been proposed in which a sub-cavity for escaping the skin resin is provided adjacent to the main cavity of the target molded product shape (Patent Documents 1, 2, etc.). reference).
しかしながら、上記特許文献１，２に記載された方法では、得ようとする成形品以外に副キャビティ部分に入り込んだスキン樹脂のみからなる無駄な派生品が発生するという新たな問題が生じる。 However, in the methods described in Patent Documents 1 and 2, there is a new problem that a useless derivative product including only the skin resin entering the subcavity portion is generated in addition to the molded product to be obtained.
本発明は、上記事情に鑑みて、略矩形の底と、４つの側壁を有し、底面の中央に１つのゲートが配置されるとともに、底面が、格子状に設けられた底面の長辺に平行な複数の長手底面補強リブと、底面の短辺に平行な複数の底面補強リブとによって補強されている有底箱型をしたサンドイッチ射出成形品であって、無駄な派生品を発生することなく、コア樹脂の充填量を増やしても、最終充填部でのコア樹脂によるスキン樹脂の突き破りを防止できるサンドイッチ射出成形品を提供することを目的としている。 In view of the above circumstances, the present invention has a substantially rectangular bottom and four side walls, one gate is arranged at the center of the bottom surface, and the bottom surface is on the long side of the bottom surface provided in a lattice shape. Sandwich injection molded product with a bottomed box shape that is reinforced by a plurality of parallel long longitudinal bottom reinforcing ribs and a plurality of bottom reinforcing ribs parallel to the short side of the bottom surface, generating wasteful derivatives In addition, an object of the present invention is to provide a sandwich injection molded product that can prevent the skin resin from being pierced by the core resin in the final filling portion even when the filling amount of the core resin is increased.
上記目的を達成するために、本発明にかかるサンドイッチ射出成形品は、略矩形の底と、４つの側壁を有し、底面の中央に１つのゲートが配置されるとともに、底面が、格子状に設けられた底面の長辺に平行な複数の長手底面補強リブと、底面の短辺に平行な複数の短手底面補強リブとによって補強されている有底箱型をしたサンドイッチ射出成形品であって、短手底面補強リブの端末が連結され、短手底面補強リブの幅より幅広で、その高さが短手底面補強リブの高さ以下の厚肉リブもしくは厚肉部を底面の長辺側の端縁に沿って備えていること、
あるいは、長手底面補強リブの端末が底面と同じ高さになるように徐々にその高さが低くなっていること、
あるいは、短手底面補強リブの端末が連結され、短手底面補強リブの幅より幅広で、その高さが短手底面補強リブの高さ以下の厚肉リブもしくは厚肉部を底面の長辺側の端縁に沿って備え、長手底面補強リブの端末が底面と同じ高さになるように徐々にその高さが低くなっていることを特徴としている。
In order to achieve the above object, a sandwich injection molded product according to the present invention has a substantially rectangular bottom and four side walls, one gate is arranged at the center of the bottom surface, and the bottom surface has a lattice shape. A sandwich injection molded product having a bottomed box shape reinforced by a plurality of long bottom surface reinforcing ribs parallel to the long side of the bottom surface and a plurality of short bottom surface reinforcing ribs parallel to the short side of the bottom surface. The end of the short bottom reinforcing rib is connected and wider than the width of the short bottom reinforcing rib, the height of which is equal to or less than the height of the short bottom reinforcing rib. Provided along the side edge,
Alternatively, the height of the longitudinal bottom reinforcing rib is gradually lowered so that the end of the rib is the same height as the bottom,
Alternatively, the end of the short bottom reinforcing rib is connected, and is wider than the width of the short bottom reinforcing rib, and the height is equal to or less than the height of the short bottom reinforcing rib. It is provided along the edge of the side, and the height of the longitudinal bottom reinforcing rib is gradually lowered so that the end of the longitudinal bottom reinforcing rib has the same height as the bottom surface.
また、本発明のサンドイッチ射出成形品は、側壁の外壁面に沿って底に直交する方向の側壁補強リブを有し、側壁補強リブと、短手底面補強リブおよび長手底面補強リブとが、幅方向にずれて設けられている構成としてもよい。 The sandwich injection-molded product of the present invention has a side wall reinforcing rib in a direction perpendicular to the bottom along the outer wall surface of the side wall, and the side wall reinforcing rib, the short bottom surface reinforcing rib, and the long bottom surface reinforcing rib have a width. It is good also as a structure shifted | deviated in the direction.
本発明にかかるサンドイッチ射出成形品は、以上のように、短手底面補強リブの端末が連結され、短手底面補強リブの幅より幅広で、その高さが短手底面補強リブの高さ以下の厚肉リブを底面の長辺側の端縁に沿って備えている構成としたので、フローリーダーとなる短手底面補強リブ形成部を長側壁側に流れた樹脂が厚肉リブ部分形成部に入り込み、一旦貯められたのち、キャビティの長側壁形成部に流入する。すなわち、長側壁形成部に流入する樹脂と短側壁形成部に流入する樹脂の流入タイミングが近づく。しかも、樹脂が長側壁形成部の幅方向全体に拡がる。したがって、無駄な派生品を発生することなく、コア樹脂の充填量を増やしても、最終充填部でのコア樹脂によるスキン樹脂の突き破りを防止できる。 As described above, the sandwich injection-molded product according to the present invention is connected to the ends of the short bottom reinforcing ribs and is wider than the width of the short bottom reinforcing ribs, and the height is equal to or less than the height of the short bottom reinforcing ribs. Since the thick ribs are provided along the edge of the long side of the bottom surface, the resin that has flowed to the long side wall of the short bottom reinforcing rib forming portion serving as a flow leader is the thick rib portion forming portion. After entering and once stored, it flows into the long side wall forming portion of the cavity. That is, the inflow timings of the resin flowing into the long side wall forming part and the resin flowing into the short side wall forming part approach. And resin spreads to the whole width direction of a long side wall formation part. Therefore, even if the filling amount of the core resin is increased without generating unnecessary derivatives, it is possible to prevent the skin resin from being pierced by the core resin in the final filling portion.
また、長手底面補強リブの端末が底面と同じ高さになるように徐々にその高さが低くなっているので、キャビティの短側壁形成部の下端まで達した樹脂は滞留することなく、スムーズに流入する。すなわち、長側壁形成部に流入する樹脂と短側壁形成部に流入する樹脂の流入タイミングが近づく。したがって、無駄な派生品を発生することなく、コア樹脂の充填量を増やしても、最終充填部でのコア樹脂によるスキン樹脂の突き破りを防止できる。 In addition, since the height of the longitudinal bottom reinforcing rib is gradually lowered so that the end of the rib becomes the same height as the bottom, the resin reaching the lower end of the short side wall forming portion of the cavity does not stay and smoothly Inflow. That is, the inflow timings of the resin flowing into the long side wall forming part and the resin flowing into the short side wall forming part approach. Therefore, even if the filling amount of the core resin is increased without generating unnecessary derivatives, it is possible to prevent the skin resin from being pierced by the core resin in the final filling portion.
さらに、側壁補強リブと、短手底面補強リブおよび長手底面補強リブとが、幅方向にずれて設けられている構成とすれば、キャビティの側壁形成部にコア樹脂が流れ込んだとき、コア樹脂が側面リブ形成部の根元部分に集中的に流れないので、均一充填が乱れることがない。したがって、コア樹脂の充填量を増やしても、最終充填部でのコア樹脂によるスキン樹脂の突き破りを防止できる。 Furthermore, if the side wall reinforcing rib, the short bottom surface reinforcing rib, and the long bottom surface reinforcing rib are configured to be shifted in the width direction, the core resin flows into the side wall forming portion of the cavity. Since it does not flow intensively at the root portion of the side rib forming portion, uniform filling is not disturbed. Therefore, even if the filling amount of the core resin is increased, the skin resin can be prevented from being broken by the core resin in the final filling portion.
以下に、本発明を、その実施の形態をあらわす図面を参照しつつ詳しく説明する。
図１〜図３は、本発明にかかるサンドイッチ射出成形品の１つの実施の形態であるコンテナをあらわしている。
Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 to 3 show a container which is one embodiment of a sandwich injection-molded product according to the present invention.
図１および図２に示すように、このコンテナ１ａは、長辺と短辺とを備える略矩形の底
２と、底２の長辺側から立設する２つの長側壁３と、底２の短辺側から立設する２つの短側壁４とを備える有底箱型をしていて、サンドイッチ射出成形によって成形されている。
そして、長側壁３と短側壁４とのコーナー部近傍には、側壁補強リブ５が底２に対して垂直に設けられている。
As shown in FIGS. 1 and 2, the container 1 a includes a substantially rectangular bottom 2 having a long side and a short side, two long side walls 3 erected from the long side of the bottom 2, and a bottom 2 It has a bottomed box shape including two short side walls 4 erected from the short side, and is formed by sandwich injection molding.
Side wall reinforcing ribs 5 are provided perpendicular to the bottom 2 in the vicinity of the corners of the long side wall 3 and the short side wall 4.
底２は、その底面２１の中央に１つのゲート２２を備えるとともに、底面２１が、格子状に設けられた底面２１の長辺に平行な複数の長手底面補強リブ２３と、底面２１の短辺に平行な複数の短手底面補強リブ２４とによって補強されている。
短手底面補強リブ２４は、短手底面補強リブ２４の幅より幅広で、その高さが短手底面補強リブ２４の高さ以下の底面２１の長辺側の端縁に沿って設けられた厚肉リブ２５に連結されている。
The bottom 2 includes one gate 22 at the center of the bottom surface 21, and the bottom surface 21 has a plurality of long bottom surface reinforcing ribs 23 parallel to the long sides of the bottom surface 21 provided in a lattice shape, and the short side of the bottom surface 21. Are reinforced by a plurality of short bottom surface reinforcing ribs 24 parallel to each other.
The short bottom surface reinforcing rib 24 is wider than the width of the short bottom surface reinforcing rib 24, and the height thereof is provided along the edge of the long side of the bottom surface 21 which is equal to or less than the height of the short bottom surface reinforcing rib 24. It is connected to the thick rib 25.
長手底面補強リブ２３は、図１〜図３に示すように、その端末が底面２１と同じ高さになるように徐々にその高さが低くなっている。
また、側壁補強リブ５は、図１に示すように、短手底面補強リブ２４および長手底面補強リブ２３と、その軸がずれた位置に形成されている。
As shown in FIGS. 1 to 3, the longitudinal bottom reinforcing rib 23 gradually decreases in height so that the end of the longitudinal bottom reinforcing rib 23 has the same height as the bottom surface 21.
Further, as shown in FIG. 1, the side wall reinforcing rib 5 is formed at a position where the short bottom reinforcing rib 24 and the long bottom reinforcing rib 23 and their axes are shifted.
このコンテナ１ａは、以上のように、底面の長辺側の端縁に沿って厚肉リブ２５を設け、短手底面補強リブ２４の端末をこの厚肉リブ２５に連結させるようにしたので、長側壁形成部に流入する樹脂と短側壁形成部に流入する樹脂の流入タイミングが近づく。しかも、樹脂が長側壁形成部の幅方向全体に拡がる。
また、長手底面補強リブ２３の端末を底面２１と同じ高さになるように徐々にその高さが低くなるようにしたので、キャビティの短側壁形成部の下端まで達した樹脂は滞留することなく、スムーズに短側壁形成部へ流入する。
As described above, the container 1a is provided with the thick rib 25 along the edge on the long side of the bottom surface, and the end of the short bottom reinforcing rib 24 is connected to the thick rib 25. The inflow timing of the resin flowing into the long side wall forming portion and the resin flowing into the short side wall forming portion approaches. And resin spreads to the whole width direction of a long side wall formation part.
Further, since the end of the longitudinal bottom reinforcing rib 23 is gradually lowered so as to be the same height as the bottom surface 21, the resin reaching the lower end of the short side wall forming portion of the cavity does not stay. Smoothly flows into the short side wall forming part.
さらに、側壁補強リブ５と、短手底面補強リブ２４および長手底面補強リブ２３とが、幅方向にずれて設けられているので、キャビティの側壁形成部にコア樹脂が流れ込んだとき、コア樹脂が側面リブ形成部の根元部分に集中的に流れず、均一充填が乱れることがない。
したがって、コア樹脂の充填量を増やしても、最終充填部でのコア樹脂によるスキン樹脂の突き破りを防止できる。すなわち、コア樹脂としてリサイクル材を多量に使用することができるようになり、コストダウンを図れるとともに、環境配慮商品（グリーン商品、エコ商品）とすることができる。
Further, since the side wall reinforcing rib 5, the short bottom surface reinforcing rib 24 and the long bottom surface reinforcing rib 23 are provided shifted in the width direction, when the core resin flows into the side wall forming portion of the cavity, the core resin It does not flow intensively at the base part of the side rib forming part, and uniform filling is not disturbed.
Therefore, even if the filling amount of the core resin is increased, the skin resin can be prevented from being broken by the core resin in the final filling portion. In other words, a large amount of recycled material can be used as the core resin, which can reduce costs and make environmentally friendly products (green products, eco products).
なお、本発明にかかるサンドイッチ射出成形品は、上記の実施の形態に限定されない。たとえば、上記の実施の形態では、短手底面補強リブ２４が厚肉リブ２５に連結され、長手底面補強リブ２３の端部が底面２１と一致するようになっていたが、いずれか一方の構造のみでも構わない。また、底の長辺と短辺の長さの差が５０ｍｍ未満の場合、長手底面補強リブ２３の端部も厚肉リブに連結される構造としたり、長手底面補強リブ２３の端部も底面２１と一致するようにしても構わない。 The sandwich injection molded product according to the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the short bottom reinforcing rib 24 is connected to the thick rib 25 and the end of the long bottom reinforcing rib 23 coincides with the bottom 21. It does n’t matter. Further, when the difference between the bottom long side and the short side length is less than 50 mm, the end of the longitudinal bottom reinforcing rib 23 is connected to the thick rib, or the end of the longitudinal bottom reinforcing rib 23 is also connected to the bottom. 21 may be matched.
図４に示すように、短手底面補強リブ２４の端末が底面２１の長側壁３側の端縁に沿って設けられた厚肉リブ２５に連結され、長手底面補強リブ２３の端末が底面２１の短側壁４側の端縁に沿って設けられた薄肉リブ２７に連結されているとともに、側壁補強リブ５と、短手底面補強リブ２４および長手底面補強リブ２３とがその軸を略一致した状態に配置されている以外は、図１のコンテナ１ａと同様に短手底面補強リブ２４の端末が底面２１の長側壁３側の端縁に沿って設けられた厚肉リブ２５に連結され、各部の寸法が以下の通りのコンテナ１ｂを以下の条件でサンドイッチ射出成形した。 As shown in FIG. 4, the end of the short bottom reinforcing rib 24 is connected to a thick rib 25 provided along the edge of the bottom wall 21 on the long side wall 3 side, and the terminal of the long bottom reinforcing rib 23 is connected to the bottom 21. The side wall reinforcing rib 5, the short bottom surface reinforcing rib 24, and the long bottom surface reinforcing rib 23 have substantially the same axis. Except for being arranged in the state, the end of the short bottom reinforcing rib 24 is connected to the thick rib 25 provided along the edge on the long side wall 3 side of the bottom surface 21 as in the container 1a of FIG. A container 1b having dimensions as follows was sandwich injection molded under the following conditions.
［各部寸法］
大きさ：５００ｍｍ×４００ｍｍ×Ｈ１５０ｍｍ
底面の基本肉厚（リブ以外の部分の肉厚）：１．８ｍｍ
Ｌ1およびＬ2：１４ｍｍ
Ｌ3およびＬ4：２．５ｍｍ
Ｌ5：３ｍｍ
側壁の肉厚：２．５ｍｍ
側面リブ幅：３．５ｍｍ
側面リブ高さ：２０ｍｍ
側面リブ本数：１６本
Ｌ6：１０ｍｍ
Ｌ7：２ｍｍ
[Dimensions of each part]
Size: 500mm x 400mm x H150mm
Basic thickness at the bottom (thickness other than ribs): 1.8mm
L 1 and L 2 : 14 mm
L 3 and L 4 : 2.5 mm
L 5 : 3 mm
Side wall thickness: 2.5mm
Side rib width: 3.5mm
Side rib height: 20mm
Number of side ribs: 16 L 6 : 10 mm
L 7 : 2 mm
［成形条件］
スキン樹脂：ブロック共重合ポリプロピレン（日本ポリケム社製ＢＣ０３Ｂ）
コア樹脂： リサイクルポリプロピレン
ゲート：底面中央１点
コア樹脂充填量：成形品全体の２５重量％
[Molding condition]
Skin resin: Block copolymerized polypropylene (BC03B manufactured by Nippon Polychem)
Core resin: Recycled polypropylene Gate: One point at the bottom center Core resin filling amount: 25% by weight of the entire molded product
図５に示すように、短手底面補強リブ２４の端末を厚肉リブに代えて薄肉リブ２８に連結させるとともに、側壁補強リブ５と、短手底面補強リブ２４および長手底面補強リブ２３とがその軸を略一致した状態に設けた以外は、図１のコンテナ１ａと同様に長手底面補強リブ２３の端末が底面２１と同じ高さになるように徐々にその高さが低くなっていて、各部の寸法が以下の通りのコンテナ１ｃを以下の条件でサンドイッチ射出成形した。 As shown in FIG. 5, the ends of the short bottom reinforcing ribs 24 are connected to the thin ribs 28 instead of the thick ribs, and the side wall reinforcing ribs 5, the short bottom reinforcing ribs 24, and the long bottom reinforcing ribs 23 are provided. Except for providing the axes in a substantially coincident state, the height of the longitudinal bottom reinforcing ribs 23 is gradually lowered so that the ends of the longitudinal bottom reinforcing ribs 23 are at the same height as the bottom 21 as in the container 1a of FIG. A container 1c having dimensions as follows was sandwich injection molded under the following conditions.
［各部寸法］
大きさ：５００ｍｍ×４００ｍｍ×Ｈ１５０ｍｍ
底面の基本肉厚（リブ以外の部分の肉厚）：１．８ｍｍ
Ｌ11およびＬ12：１４ｍｍ
Ｌ13およびＬ14：２．５ｍｍ
Ｌ15：３ｍｍ
側壁の肉厚：２．５ｍｍ
側面リブ幅：３．５ｍｍ
側面リブ高さ：２０ｍｍ
側面リブ本数：１６本
Ｌ16：１２ｍｍ
Ｌ17：２ｍｍ
[Dimensions of each part]
Size: 500mm x 400mm x H150mm
Basic thickness at the bottom (thickness other than ribs): 1.8mm
L 11 and L 12 : 14 mm
L 13 and L 14 : 2.5 mm
L 15 : 3 mm
Side wall thickness: 2.5mm
Side rib width: 3.5mm
Side rib height: 20mm
Number of side ribs: 16 L 16 : 12mm
L 17 : 2 mm
［成形条件］
スキン樹脂：ブロック共重合ポリプロピレン（日本ポリケム社製ＢＣ０３Ｂ）
コア樹脂： リサイクルポリプロピレン
ゲート：底面中央１点
コア樹脂充填量：成形品全体の２５重量％
[Molding condition]
Skin resin: Block copolymerized polypropylene (BC03B manufactured by Nippon Polychem)
Core resin: Recycled polypropylene Gate: One point at the bottom center Core resin filling amount: 25% by weight of the entire molded product
図６に示すように、側壁補強リブ５と、短手底面補強リブ２４および長手底面補強リブ２３とがその軸をずらせて形成した以外は、図５のコンテナ１ｃと各部の寸法がすべて同様のコンテナ１ｄを以下の条件でサンドイッチ射出成形した。 As shown in FIG. 6, the dimensions of each part are the same as those of the container 1c of FIG. 5 except that the side wall reinforcing rib 5, the short bottom reinforcing rib 24 and the long bottom reinforcing rib 23 are formed by shifting their axes. The container 1d was subjected to sandwich injection molding under the following conditions.
［成形条件］
スキン樹脂：ブロック共重合ポリプロピレン（日本ポリケム社製ＢＣ０３Ｂ）
コア樹脂： リサイクルポリプロピレン
ゲート：底面中央１点
コア樹脂充填量：成形品全体の３３重量％
上記実施例１〜３で得られたコンテナ１ｂ，１ｃ，１ｄは、いずれも表面へのコア樹脂の飛び出しがなく、表面形状の優れたものであった。
[Molding condition]
Skin resin: Block copolymerized polypropylene (BC03B manufactured by Nippon Polychem)
Core resin: Recycled polypropylene Gate: One point at the bottom center Core resin filling amount: 33% by weight of the entire molded product
The containers 1b, 1c, and 1d obtained in Examples 1 to 3 were all excellent in surface shape, with no core resin jumping out to the surface.
一方、比較のために、底面周縁部の全周にわたって幅２ｍｍの薄肉リブを設け、短手底面補強リブ２４および長手底面補強リブ２３のそれぞれの端末をこの薄肉リブに連結するようにした以外は、実施例１と同じ形状および寸法の図７に示すような従来タイプのコンテナを、コア樹脂の充填量２５重量％でサンドイッチ射出成形したところ、コア樹脂がスキン樹脂を突き破り、成形品表面に飛び出した部分が生じ、外観的に問題があった。 On the other hand, for comparison, except that a thin rib having a width of 2 mm is provided over the entire circumference of the bottom peripheral edge, and each end of the short bottom reinforcing rib 24 and the long bottom reinforcing rib 23 is connected to the thin rib. When a conventional container of the same shape and dimensions as in Example 1 as shown in FIG. 7 is sandwich injection molded with a core resin filling amount of 25% by weight, the core resin breaks through the skin resin and jumps to the surface of the molded product. There was a problem in appearance.
１ａ，１ｂ，１ｃ，１ｄ コンテナ（サンドイッチ射出成形品）
２ 底
２１ 底面
２２ ゲート
２３ 長手底面補強リブ
２４ 短手底面補強リブ
２５ 厚肉リブ
３ 長側壁
４ 短側壁
５ 側壁補強リブ
1a, 1b, 1c, 1d Container (sandwich injection molded product)
2 bottom 21 bottom 22 gate 23 long bottom reinforcing rib 24 short bottom reinforcing rib 25 thick rib 3 long side wall 4 short side wall 5 side wall reinforcing rib
Claims (4)
2. A side wall reinforcing rib in a direction orthogonal to the bottom along the outer wall surface of the side wall, wherein the side wall reinforcing rib, the short bottom surface reinforcing rib, and the long bottom surface reinforcing rib are shifted in the width direction. The sandwich injection-molded article according to any one of claims 3 to 4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003312861A JP4177211B2 (en) | 2003-09-04 | 2003-09-04 | Sandwich injection molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003312861A JP4177211B2 (en) | 2003-09-04 | 2003-09-04 | Sandwich injection molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2005081562A JP2005081562A (en) | 2005-03-31 |
| JP4177211B2 true JP4177211B2 (en) | 2008-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2003312861A Expired - Fee Related JP4177211B2 (en) | 2003-09-04 | 2003-09-04 | Sandwich injection molded products |
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| US8491290B2 (en) * | 2011-10-21 | 2013-07-23 | Kortec, Inc. | Apparatus for producing non-symmetric multiple layer injection molded products |
| JP5928323B2 (en) * | 2012-12-17 | 2016-06-01 | 日本ポリプロ株式会社 | Polypropylene resin molded product |
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| JPS59193129U (en) * | 1983-06-09 | 1984-12-21 | 矢崎化工株式会社 | Synthetic resin packaging containers |
| JP2701157B2 (en) * | 1989-01-13 | 1998-01-21 | 旭化成工業株式会社 | Crystalline thermoplastic resin plate-like structure |
| JPH0665151U (en) * | 1993-02-24 | 1994-09-13 | 豊田合成株式会社 | Steering column cover |
| JP3540060B2 (en) * | 1995-07-24 | 2004-07-07 | 昭和電工株式会社 | Air cleaner case |
| JPH1161868A (en) * | 1997-08-13 | 1999-03-05 | Kobe Steel Ltd | Manhole cover made of fiber-reinforced resin |
| JP4079344B2 (en) * | 2001-06-27 | 2008-04-23 | 株式会社明治ゴム化成 | Plastic pallet |
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