JP4511875B2 - Bottomed box sandwich product - Google Patents
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- JP4511875B2 JP4511875B2 JP2004157918A JP2004157918A JP4511875B2 JP 4511875 B2 JP4511875 B2 JP 4511875B2 JP 2004157918 A JP2004157918 A JP 2004157918A JP 2004157918 A JP2004157918 A JP 2004157918A JP 4511875 B2 JP4511875 B2 JP 4511875B2
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Description
本発明は、コンテナ等の有底箱型をしたサンドイッチ成形品に関する。 The present invention relates to a sandwich molded product having a bottomed box shape such as a container.
プラスチック材料のリサイクルを図るために、サンドイッチ成形品のコア層にリサイクル材を用いることが既に提案されている（たとえば、非特許文献１参照）。
すなわち、外部に露出するスキン層をバージンの樹脂で形成し、スキン層によって隠蔽されるコア層にリサイクル材を用いるようにしている。
In order to recycle the plastic material, it has already been proposed to use a recycled material for the core layer of the sandwich molded product (see, for example, Non-Patent Document 1).
That is, the skin layer exposed to the outside is formed of a virgin resin, and the recycled material is used for the core layer concealed by the skin layer.
しかし、従来のサンドイッチ成形方法を用いて、底面が略長方形や正方形をしたコンテナ等の有底箱型サンドイッチ成形品を得ようとした場合、以下の理由によりコア層形成樹脂の充填量をあまり増やすことができないという問題がある。
すなわち、有底箱型サンドイッチ成形品の場合、底面の中央にゲートが設けられているため、充填が遅れるコーナー部では、後から射出されるコア層形成樹脂の多くが短辺側に流れ短辺側でスキン層樹脂を突き破る現象が見られる。さらに、底面が長方形の有底箱型サンドイッチ成形品においては、長辺側と短辺側とでも樹脂の到達時間が異なるため、コーナー部以外に充填が遅れる短辺側でもコア層形成樹脂がスキン層樹脂を突き破るという問題がある。
However, when a conventional sandwich molding method is used to obtain a bottomed box-type sandwich molded product such as a container having a substantially rectangular or square bottom, the filling amount of the core layer forming resin is increased too much for the following reason. There is a problem that can not be.
That is, in the case of a bottomed box-type sandwich molded product, since the gate is provided in the center of the bottom surface, in the corner portion where filling is delayed, most of the core layer forming resin injected later flows to the short side and the short side There is a phenomenon that breaks through the skin layer resin on the side. In addition, in bottomed box sandwich products with a rectangular bottom, the arrival time of the resin is different on the long side and the short side, so the core layer forming resin is skinned on the short side where filling is delayed in addition to the corner. There is a problem of breaking through the layer resin.
本発明は、上記事情に鑑みて、従来に比べ、コア層樹脂の充填量が多く、しかも、コア層樹脂によるスキン層の突き破りがない、外観良好な有底箱型サンドイッチ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 provides a bottomed box-type sandwich molded article having a good appearance and having a larger filling amount of the core layer resin than the conventional one, and further, the skin layer does not break through the core layer resin. It is an object.
上記目的を達成するために、本発明の有底箱型サンドイッチ成形品は、底が少なくとも略長方形の底板部を備え、スキン層樹脂及びコア層樹脂が底形成部の中心点に設けたゲートからキャビティ内に射出されて得られる有底箱型サンドイッチ成形品において、底板部の長辺と、この長辺の両端と底板部の中心点とを結ぶ線分とで囲まれる三角形領域内の底板の体積をＶ１、底板部の短辺と、この短辺の両端と底板部の中心点とを結ぶ線分とで囲まれる三角形領域内の底板の体積をＶ２、（底板部の長辺長さ）／（底板部の短辺長さ）をＲ（１．３５≦Ｒ≦２）としたとき、Ｖ２＞Ｖ１、０．８４Ｒ≦Ｖ２／Ｖ１≦０．９５Ｒ、および、（底板部の長辺から立ち上がる長側壁の肉厚）＜（底板部の短辺から立ち上がる短側壁の肉厚）を満足するとともに、底板部のコーナーを結ぶ２つの対角線に対して各対角線を両側から挟むように各対角線から等間隔位置で対角線に平行に引かれた２組の仮想平行線によって囲まれたＸ字状部分の底板部の肉厚が、底板部の残部の肉厚より厚いことを特徴としている。
In order to achieve the above object, the bottomed box-type sandwich molded product of the present invention comprises a bottom plate portion having a bottom that is at least substantially rectangular, and a gate provided with a skin layer resin and a core layer resin at the center point of the bottom forming portion. In a bottomed box sandwich molded product obtained by being injected into a cavity, the bottom plate in a triangular region surrounded by the long side of the bottom plate portion and the line segment connecting both ends of the long side and the center point of the bottom plate portion. The volume is V 1 , the volume of the bottom plate in the triangular area surrounded by the short side of the bottom plate portion and the line segment connecting both ends of the short side and the center point of the bottom plate portion is V 2 , (the long side length of the bottom plate portion S) / (Short side length of bottom plate portion) is R (1.35 ≦ R ≦ 2) , V 2 > V 1 , 0.84R ≦ V 2 / V 1 ≦ 0.95R, and ( Thickness of the long side wall rising from the long side of the bottom plate part) <(Thickness of the short side wall rising from the short side of the bottom plate part) X character surrounded by two sets of virtual parallel lines drawn parallel to the diagonal lines at equal intervals from each diagonal so as to sandwich the diagonal lines from both sides with respect to the two diagonal lines connecting the corners of the bottom plate portion. The thickness of the bottom plate portion of the shaped portion is characterized by being thicker than the thickness of the remaining portion of the bottom plate portion .
本発明のサンドイッチ成形品において、底は、板状の底板部のみで形成されている場合、底板部に沿って補強リブが設けられている場合がある。そして、底の体積とは、底板部に沿って補強リブが設けられている場合、底板部のみの体積ではなく、底板部の体積と補強リブの体積との合計である。
なお、略長方形とは、コーナー部が直角ではなく、アール状になったものも含む。
In the sandwich molded product of the present invention , when the bottom is formed only by a plate-like bottom plate portion, reinforcing ribs may be provided along the bottom plate portion. And the volume of a bottom is not the volume of only a bottom plate part but the sum of the volume of a bottom plate part, and the volume of a reinforcement rib, when the reinforcement rib is provided along the bottom plate part.
In addition, the substantially rectangular shape includes those in which the corner portion is not a right angle but a round shape.
また、Ｖ2／Ｖ1が０．８４Ｒ未満であると、短辺側のスキン層樹脂の充填が遅れ、短辺側でコア層樹脂によるスキン層樹脂の突き破りが低いコア比率で発生する恐れがあり、０．９５Ｒを超えると、長辺側のスキン層樹脂の充填が遅れ、長辺側でコア層樹脂によるスキン層樹脂の突き破りが低いコア比率で発生する恐れがある。
なお、Ｖ2／Ｖ1は、Ｒが１＜Ｒ≦１．４の場合、０．９２Ｒ〜０．９５Ｒが好ましく、Ｒが１．４＜Ｒ≦１．７の場合、０．８８Ｒ〜０．９１Ｒが好ましく、Ｒが１．７＜Ｒ≦２の場合、０．８４Ｒ〜０．８７Ｒが好ましい。
Further, when V 2 / V 1 is less than 0.84R, filling of the skin layer resin on the short side is delayed, and there is a possibility that the skin layer resin is broken through by the core layer resin on the short side at a low core ratio. If it exceeds 0.95R, filling of the skin layer resin on the long side is delayed, and there is a possibility that the skin layer resin is broken through by the core layer resin on the long side with a low core ratio.
V 2 / V 1 is preferably 0.92R to 0.95R when R is 1 <R ≦ 1.4, and is 0.88R to 0 when R is 1.4 <R ≦ 1.7. .91R is preferable, and when R is 1.7 <R ≦ 2, 0.84R to 0.87R is preferable.
さらに、（底板部の長辺から立ち上がる長側壁の肉厚）／底板部の短辺から立ち上がる短側壁の肉厚）をＴとしたとき、Ｔは、０．７６Ｒ≦Ｔ≦０．９２Ｒを満足することが好ましい。
すなわち、Ｔが０．７６Ｒ未満であると、長側壁側へのスキン層樹脂の充填が遅れ、長
側壁でコア層樹脂によるスキン層樹脂の突き破りが低いコア比率で発生する恐れがあり、０．９２Ｒを超えると、短側壁側へのスキン層樹脂の充填が遅れ、短側壁でコア層樹脂によるスキン層樹脂の突き破りが低いコア比率で発生する恐れがある。
Furthermore, when T is (thickness of the long side wall rising from the long side of the bottom plate part) / thickness of the short side wall rising from the short side of the bottom plate part), T satisfies 0.76R ≦ T ≦ 0.92R. It is preferable to do.
That is, when T is less than 0.76R, the filling of the skin layer resin on the long side wall side is delayed, and the skin layer resin may break through the core layer resin on the long side wall at a low core ratio. When it exceeds 92R, the filling of the skin layer resin on the short side wall side is delayed, and there is a possibility that the skin layer resin breakthrough by the core layer resin occurs at the short side wall at a low core ratio.
加えて、本発明の有底箱型サンドイッチ成形品は、底板部のコーナーを結ぶ２つの対角線に対して各対角線を両側から挟むように各対角線から等間隔位置で対角線に平行に引かれた２組の仮想平行線によって囲まれたＸ字状部分の底板部の肉厚が、底板部の残部の肉厚より厚いことを特徴としている。 In addition, a bottomed box-sandwich molded article of the present invention, a diagonal drawn parallel to the equally spaced positions from each diagonal so as to sandwich the respective diagonal lines from both sides of the two diagonal lines joining the corners of the bottom plate portion The thickness of the bottom plate portion of the X-shaped portion surrounded by two sets of virtual parallel lines is characterized by being thicker than the thickness of the remaining portion of the bottom plate portion.
また、本発明のサンドイッチ成形品において、Ｘ字状部分の面積は、特に限定されないが、底板部の面積の１／５〜１／３程度が好ましい。
すなわち、Ｘ字状部分の面積が、底板部の面積の１／５未満であると、厚肉部の肉厚が厚くなって冷却時間が延び、生産性が低下する恐れがあり、１／３を超えると、厚肉部の肉厚と残部の肉厚差が小さくなり、効果が得られなくなる恐れがある。
In the sandwich molded product of the present invention , the area of the X-shaped part is not particularly limited, but is preferably about 1/5 to 1/3 of the area of the bottom plate part.
That is, if the area of the X-shaped part is less than 1/5 of the area of the bottom plate part, the thickness of the thick part becomes thick, the cooling time may be extended, and the productivity may be lowered. If it exceeds, the difference in thickness between the thick part and the remaining part will be small, and the effect may not be obtained.
また、本発明にかかる有底箱型サンドイッチ成形品において、コア層およびスキン層を形成する樹脂としては、特に限定されないが、ポリエチレンやポリプロピレン等のポリオレフィン系樹脂が好適に使用される。また、コア層を形成する樹脂としては、リサイクル材が好ましいが、バージンの樹脂を用いても構わない。 In the bottomed box sandwich product according to the present invention, the resin for forming the core layer and the skin layer is not particularly limited, but polyolefin resins such as polyethylene and polypropylene are preferably used. The resin for forming the core layer is preferably a recycled material, but a virgin resin may be used.
本発明のサンドイッチ成形品は、以上のように、底が少なくとも略長方形の底板部を備え、底板部の長辺と、この長辺の両端と底板部の中心点とを結ぶ線分とで囲まれる三角形領域内の底板の体積をＶ1、底板部の短辺と、この短辺の両端と底板部の中心点とを結ぶ線分とで囲まれる三角形領域内の底板の体積をＶ2、（底板部の長辺長さ）／（底板部の短辺長さ）をＲとしたとき、Ｖ2＞Ｖ1、０．８４Ｒ≦Ｖ2／Ｖ1≦０．９５Ｒ、および、（底板部の長辺から立ち上がる長側壁の肉厚）＜（底板部の短辺から立ち上がる短側壁の肉厚）を満足するので、ゲートから短辺側への樹脂流路が長辺側への樹脂流路に比べて樹脂が流れやすくなる。すなわち、スキン層を形成するスキン層樹脂がスムーズに短辺側へ素早く流れる。したがって、コア層樹脂の充填量を増やしてもコア層樹脂がスキン層樹脂を突き破ることがなくなり、リサイクル材を多量に消費することができる。 Sa sandwiches molded article of the present invention, as described above, the bottom comprises a bottom plate portion of at least substantially rectangular, the long sides of the bottom plate portion, with a line connecting the center points of both ends and the bottom plate portion of the long side The volume of the bottom plate in the enclosed triangular region is V1, and the volume of the bottom plate in the triangular region enclosed by the short side of the bottom plate portion and the line segment connecting both ends of the short side and the center point of the bottom plate portion is V2, ( When R is the long side length of the bottom plate portion / (short side length of the bottom plate portion), V2> V1, 0.84R ≦ V2 / V1 ≦ 0.95R, and (rise from the long side of the bottom plate portion) (Thickness of the long side wall) <(thickness of the short side wall rising from the short side of the bottom plate)), the resin flow path from the gate to the short side is more resin than the resin flow path to the long side. It becomes easy to flow. That is, the skin layer resin forming the skin layer smoothly flows quickly to the short side. Therefore, even if the filling amount of the core layer resin is increased, the core layer resin does not break through the skin layer resin, and a large amount of recycled material can be consumed.
加えて、底板部のコーナーを結ぶ２つの対角線に対して各対角線を両側から挟むように各対角線から等間隔位置で対角線に平行に引かれた２組の仮想平行線によって囲まれたＸ字状部分の底板部の肉厚が、底板部の残部の肉厚より厚い構成とすることで、より効率よくコア層樹脂の充填量を増やすことができる。
In addition, an X-shape surrounded by two sets of virtual parallel lines drawn parallel to the diagonal lines at equal intervals from each diagonal line so as to sandwich the diagonal lines from both sides with respect to the two diagonal lines connecting the corners of the bottom plate portion By making the thickness of the bottom plate portion of the portion thicker than the thickness of the remaining portion of the bottom plate portion, the filling amount of the core layer resin can be increased more efficiently.
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および図２は、本発明にかかる有底箱型サンドイッチ成形品の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 and 2 show a container which is one embodiment of a bottomed box sandwich 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、スキン層がバージンのポリオレフィン樹脂、コア層がポリオレフィン樹脂のリサイクル材で形成されているサンドイッチ成形品であって、その底２ａが、コーナー部をアール形状に面取りされた略長方形の底板部３ａと底板部３ａの下面に沿って設けられた格子状の補強リブ４ａとを備え、図３に示すように、底板部３ａの中心点３１にゲート（図示せず）が設けられている。
また、底板部３ａの長辺３２から長側壁５１が立ち上がり、短辺３３から短側壁５２が立ち上がっている。
As shown in FIGS. 1 and 2, this
Further, the
また、底２ａは、図３に示すように、底板部３ａの長辺３２、および、底板部３ａの中
心点３１と長辺３２の両端とを結ぶ２つの線分３４ａ，３４ｂとによって囲まれる三角形領域内の部分３５ａの体積をＶ1、底板部３ａの短辺３３、および、中心点３１と短辺３
３の両端とを結ぶ２つの線分３４ａ，３４ｂとによって囲まれる三角形領域内の部分３５ｂの体積をＶ2、（底板部３ａの長辺長さＬ1）／（底板部３ａの短辺長さＬ2）をＲとし
、（長側壁５１の肉厚）／短側壁５２の肉厚）をＴとしたときたとき、Ｖ2＞Ｖ1、０．８４Ｒ≦Ｖ2／Ｖ1≦０．９５Ｒ、０．７６Ｒ≦Ｔ≦０．９２Ｒを満足するように成形されている。
Further, as shown in FIG. 3, the
3, the volume of the
図４および図５は、本発明にかかる有底箱型サンドイッチ成形品の他の実施の形態であるコンテナをあらわしている。
図４および図５に示すように、このコンテナ１ｂは、スキン層がバージンのポリオレフィン樹脂、コア層がポリオレフィン樹脂のリサイクル材で形成されているサンドイッチ成形品であって、その底２ｂがコーナー部をアール形状に面取りされた略正方形の底板部３ｂと底板部３ｂに設けられた格子状の補強リブ４ｂとを備え、図６に示すように底板部３ｂの中心点３６にゲート（図示せず）が設けられている。
4 and 5 show a container which is another embodiment of a bottomed box sandwich product according to the present invention.
As shown in FIGS. 4 and 5, the
また、図６に示すように、底２ｂは、底板部３ｂのコーナーと底板部３ｂのコーナーとを結ぶ２つの対角線６を挟んで所定幅で対角線６に平行に引かれた４本の仮想平行線３８に囲まれる部分３９ａの底板部３ｂの肉厚が、底板部３ｂの残部３９ｂの肉厚より厚くなっている。
なお、図４〜図６中、５３は側壁である。
Further, as shown in FIG. 6, the
4 to 6, 53 is a side wall.
以下に、本発明の具体的な実施例を比較例と対比させて説明する。 Specific examples of the present invention will be described below in comparison with comparative examples.
（実施例１）
底板部の長辺長さＬ1が５００ｍｍ、短辺長さＬ2が３００ｍｍ、Ｒ（Ｌ1／Ｌ2）＝１．６７、側壁の高さが２００ｍｍ、底板部に補強リブ（リブ幅２ｍｍ、リブピッチ２０ｍｍ）が設けられ、Ｖ1部の体積、Ｖ1部の底板部肉厚、Ｖ2部の体積、Ｖ2部の底板部肉厚、長側壁の肉厚、短側壁の肉厚、Ｖ2部の体積／Ｖ1部の体積比（表１ではＶ2／Ｖ1と示す）が以下の表１に示すとおりである図１〜図３に示すような形状のコンテナ（実験例１〜実験例８）を、それぞれ５重量％ずつコア層樹脂の充填比率を増やして作製し、コア層がスキン層を突き破らないコア層樹脂の最大充填比率およびコア層樹脂の充填比率を４０重量％とした場合のスキン層の破れ発生箇所を調べ、その結果を併せて表１に示した。なお、実験例４，６の場合、底板部のコーナーを結ぶ２つの対角線を中心に所定間隔で対角線に平行に引かれた２組の仮想平行線によって囲まれたＸ字状部分（底板部の１／４の面積）の底板部の肉厚を、表１に示すように、底板部の残部の肉厚より厚くした。また、補強リブの高さは、底板部の肉厚が３ｍｍの部分は２ｍｍ、底板部の肉厚が３ｍｍより厚い部分は、｛２−（底板部の厚み−３）｝ｍｍ、底板部の肉厚が３ｍｍより薄い部分は、｛２＋（３−底板部の厚み）｝ｍｍとして、コンテナとその設置面との間に隙間が生じないようにした。
Example 1
The long side length L 1 of the bottom plate portion is 500 mm, the short side length L 2 is 300 mm, R (L 1 / L 2 ) = 1.67, the height of the side wall is 200 mm, and the reinforcing rib (rib width 2 mm) is provided on the bottom plate portion. Rib pitch 20 mm), V 1 part volume, V 1 part bottom plate thickness, V 2 part volume, V 2 part bottom plate thickness, long side wall thickness, short side wall thickness, the volume ratio of the volume / V 1 part of V 2 parts 1-3 are shown such a shape container (experimental example 1 (shown in Table 1, V 2 / V 1) are as shown in Table 1 below ~ Experimental Example 8) were prepared by increasing the filling ratio of the core layer resin by 5% by weight, respectively, and the maximum filling ratio of the core layer resin and the filling ratio of the core layer resin that the core layer did not break through the skin layer were 40 weights. The occurrence of tearing of the skin layer in the case of% was investigated, and the results are also shown in Table 1. In the case of Experimental Examples 4 and 6, the X-shaped portion (the bottom plate portion of the bottom plate portion) surrounded by two sets of virtual parallel lines drawn in parallel with the diagonal line at a predetermined interval around the two diagonal lines connecting the corners of the bottom plate portion. As shown in Table 1, the thickness of the bottom plate portion (1/4 area) was thicker than the remaining thickness of the bottom plate portion. In addition, the height of the reinforcing rib is 2 mm when the thickness of the bottom plate portion is 3 mm, and {2- (the thickness of the bottom plate portion -3)} mm when the thickness of the bottom plate portion is greater than 3 mm. The portion where the wall thickness is less than 3 mm is set as {2+ (3-thickness of the bottom plate portion)} mm so that no gap is generated between the container and its installation surface.
上記表1から、以下のようなことがわかる。すなわち、実験例２〜４、７、８に示すよ
うにＶ2＞Ｖ1にすれば、あるいは、実験例４、６のように、Ｘ字状部分の底板部の肉厚を、底板部の残部の肉厚より厚くすれば、Ｖ2＝Ｖ1である実験例１に比べ、コア層樹脂の充
填量を増やすことができる。また、実験例５のようにＶ2＝Ｖ1であれば、長側壁の肉厚より短側壁の肉厚を厚くしても、その効果はないが、実験例３のようにＶ2＞Ｖ1であれば、長側壁の肉厚より短側壁の肉厚を厚くすると、より充填量を増やすことができる。
From Table 1 above, the following can be seen. That is, if V 2 > V 1 as shown in Experimental Examples 2 to 4, 7, and 8, or as in Experimental Examples 4 and 6, the thickness of the bottom plate portion of the X-shaped portion is If it is thicker than the remaining thickness, the filling amount of the core layer resin can be increased as compared with Experimental Example 1 in which V 2 = V 1 . Further, if V 2 = V 1 as in Experimental Example 5, even if the thickness of the short side wall is made larger than the thickness of the long side wall, there is no effect, but V 2 > V as in Experimental Example 3 If it is 1 , if the thickness of the short side wall is made larger than the thickness of the long side wall, the filling amount can be increased.
（実施例２）
底板部の長辺長さＬ1が８００ｍｍ、短辺長さＬ2が４００ｍｍ、Ｒ（Ｌ1／Ｌ2）＝２、側壁の高さが２００ｍｍ、底板部に補強リブ（リブ幅２ｍｍ、リブピッチ２０ｍｍ）が設けられ、Ｖ1部の体積、Ｖ1部の底板部肉厚、Ｖ2部の体積、Ｖ2部の底板部肉厚、長側壁の肉厚、短側壁の肉厚、Ｖ2部の体積／Ｖ1部の体積比（表２ではＶ2／Ｖ1と示す）が以下の表２に示すとおりである図１〜図３に示すような形状のコンテナ（実験例９〜実験例１６）を、それぞれ５重量％ずつコア層樹脂の充填比率を増やして作製し、コア層がスキン層を突き破らないコア層樹脂の最大充填比率およびコア層樹脂の充填比率を４０重量％とした場合のスキン層の破れ発生箇所を調べ、その結果を併せて表２に示した。なお、実験例１２，１４の場合、底板部のコーナーを結ぶ２つの対角線を中心に所定間隔で対角線に平行に引かれた２組の仮想平行線によって囲まれたＸ字状部分（底板部の１／６の面積）の底板部の肉厚を、表２に示すように、底板部の残部の肉厚より厚くした。また、補強リブの高さは、底板部の肉厚が３ｍｍの部分は２ｍｍ、底板部の肉厚が３ｍｍより厚い部分は、｛２−（底板部の厚み−３）｝ｍｍ、底板部の肉厚が３ｍｍより薄い部分は、｛２＋（３−底板部の厚み）｝ｍｍとして、コンテナとその設置面との間に隙間が生じないようにした。
(Example 2)
The long side length L 1 of the bottom plate part is 800 mm, the short side length L 2 is 400 mm, R (L 1 / L 2 ) = 2, the side wall height is 200 mm, and the reinforcing ribs (rib width 2 mm, rib pitch) on the bottom plate part 20 mm), V 1 part volume, V 1 part bottom plate part thickness, V 2 part volume, V 2 part bottom plate part thickness, long side wall thickness, short side wall thickness, V 2 1 to FIG. 3 in which the volume ratio of parts / volume of V 1 (shown as V 2 / V 1 in Table 2) is as shown in Table 2 below (Experimental Examples 9 to Example 16) was prepared by increasing the core layer resin filling ratio by 5% by weight, respectively, and the core layer resin maximum filling ratio and core layer resin filling ratio at which the core layer did not penetrate the skin layer were 40% by weight. The occurrence of the tearing of the skin layer was investigated, and the results are also shown in Table 2. In the case of Experimental Examples 12 and 14 , an X-shaped portion (the bottom plate portion of the bottom plate portion) surrounded by two sets of virtual parallel lines drawn in parallel with the diagonal line at a predetermined interval around two diagonal lines connecting the corners of the bottom plate portion. As shown in Table 2, the thickness of the bottom plate portion (1/6 area) was made thicker than the thickness of the remaining portion of the bottom plate portion. In addition, the height of the reinforcing rib is 2 mm when the thickness of the bottom plate portion is 3 mm, and {2- (the thickness of the bottom plate portion -3)} mm when the thickness of the bottom plate portion is greater than 3 mm. The portion where the wall thickness is less than 3 mm is set as {2+ (3-thickness of the bottom plate portion)} mm so that no gap is generated between the container and its installation surface.
上記表２から、以下のようなことがわかる。すなわち、実験例１０〜１２、１４〜１６に示すようにＶ2＞Ｖ1にすれば、あるいは、実験例１２、１４のように、Ｘ字状部分の底板部の肉厚を、底板部の残部の肉厚より厚くすれば、Ｖ2＝Ｖ1である実験例９に比べ、コ
ア層樹脂の充填量を増やすことができる。また、実験例１３のようにＶ2＝Ｖ1であれば、長側壁の肉厚より短側壁の肉厚を厚くしても、その効果はないが、実験例１２、１４のようにＶ2＞Ｖ1であれば、長側壁の肉厚より短側壁の肉厚を厚くすると、より充填量を増やすことができる。
From Table 2 above, the following can be seen. That is, if V 2 > V 1 as shown in Experimental Examples 10 to 12 and 14 to 16, or as in Experimental Examples 12 and 14, the thickness of the bottom plate portion of the X-shaped part is If it is thicker than the remaining thickness, the filling amount of the core layer resin can be increased as compared with Experimental Example 9 in which V 2 = V 1 . Further, if V 2 = V 1 as in Experimental Example 13, even if the thickness of the short side wall is made larger than the thickness of the long side wall, there is no effect, but as in Experimental Examples 12 and 14, V 2 If> V 1 , the filling amount can be increased by increasing the thickness of the short side wall from the thickness of the long side wall.
（実施例３）
底板部の長辺長さＬ1が３６４ｍｍ、短辺長さＬ2が２７０ｍｍ、Ｒ（Ｌ1／Ｌ2）＝１．３５、側壁の高さが１２５ｍｍ、底板部に、Ｖ1部の体積、Ｖ1部の底板部肉厚、Ｖ2部の
体積、Ｖ2部の底板部肉厚、長側壁の肉厚、短側壁の肉厚、Ｖ2部の体積／Ｖ1部の体積比
（表３ではＶ2／Ｖ1と示す）が以下の表３に示すとおりである図１〜図３に示すようなコンテナ（実験例１７〜実験例２４）を、それぞれ５重量％ずつコア層樹脂の充填比率を増やして作製し、コア層がスキン層を突き破らないコア層樹脂の最大充填比率およびコア層樹脂の充填比率を４０重量％とした場合のスキン層の破れ発生箇所を調べ、その結果を併せて表３に示した。なお、実験例２０，２２の場合、底板部のコーナーを結ぶ２つの対角線を中心に所定間隔で対角線に平行に引かれた２組の仮想平行線によって囲まれたＸ字状部分（底板部の１／４の面積）の底板部の肉厚を、表３に示すように、底板部の残部の肉厚より厚くした。
(Example 3)
The long side length L 1 of the bottom plate part is 364 mm, the short side length L 2 is 270 mm, R (L 1 / L 2 ) = 1.35, the height of the side wall is 125 mm, and the volume of the V 1 part is in the bottom plate part. , V 1 part bottom plate thickness, V 2 part volume, V 2 part bottom plate thickness, long side wall thickness, short side wall thickness, V 2 part volume / V 1 part volume ratio ( The containers (Experimental Example 17 to Experimental Example 24) as shown in FIGS. 1 to 3 in which V 2 / V 1 in Table 3 are as shown in Table 3 below are each 5% by weight of the core layer resin. The core layer is not broken through the skin layer and the core layer resin has a maximum filling ratio and the core layer resin filling ratio is 40% by weight. The results are also shown in Table 3. In the case of Experimental Examples 20 and 22 , the X-shaped portion (the bottom plate portion of the bottom plate portion) surrounded by two sets of virtual parallel lines drawn in parallel with the diagonal line at a predetermined interval around two diagonal lines connecting the corners of the bottom plate portion. As shown in Table 3, the thickness of the bottom plate portion (1/4 area) was thicker than the thickness of the remaining portion of the bottom plate portion.
上記表３から、以下のようなことがわかる。すなわち、実験例１８〜２０、２２〜２４に示すようにＶ2＞Ｖ1にすれば、あるいは、実験例２０、２２のように、Ｘ字状部分の底板部の肉厚を、底板部の残部の肉厚より厚くすれば、Ｖ2＝Ｖ1である実験例１７に比べ、
コア層樹脂の充填量を増やすことができる。また、実験例２１のようにＶ2＝Ｖ1であれば、長側壁の肉厚より短側壁の肉厚を厚くしても、その効果はないが、実験例１９、２０のようにＶ2＞Ｖ1であれば、長側壁の肉厚より短側壁の肉厚を厚くすると、より充填量を増やすことができる。
From Table 3 above, the following can be seen. That is, if V 2 > V 1 as shown in Experimental Examples 18 to 20, 22 to 24, or as in Experimental Examples 20 and 22, the thickness of the bottom plate portion of the X-shaped portion is If it is thicker than the remaining thickness, compared to Experimental Example 17 where V 2 = V 1 ,
The filling amount of the core layer resin can be increased. Further, as long as V 2 = V 1 as in Experimental Example 21, even if the thickness of the short side wall is made larger than the thickness of the long side wall, there is no effect, but V 2 as in Experimental Examples 19 and 20. If> V 1 , the filling amount can be increased by increasing the thickness of the short side wall from the thickness of the long side wall.
１ａ，１ｂ コンテナ（有底箱型サンドイッチ成形品）
２ａ，２ｂ 底
３ａ，３ｂ 底板部
３１，３６ 中心点
３２ 長辺
３３ 短辺
３４ａ，３４ｂ 線分
３５ａ，３５ｂ 三角形領域内の部分
３８ 仮想平行線
３９ａ Ｘ字形部分
３９ｂ 残部
４ａ，４ｂ 補強リブ
６ 対角線
５１ 長側壁
５２ 短側壁
1a, 1b container (bottom box type sandwich molded product)
2a,
Claims (1)
底板部の長辺と、この長辺の両端と底板部の中心点とを結ぶ線分とで囲まれる三角形領域内の底板の体積をＶ１、底板部の短辺と、この短辺の両端と底板部の中心点とを結ぶ線分とで囲まれる三角形領域内の底板の体積をＶ２、（底板部の長辺長さ）／（底板部の短辺長さ）をＲ（１．３５≦Ｒ≦２）としたとき、Ｖ２＞Ｖ１、０．８４Ｒ≦Ｖ２／Ｖ１≦０．９５Ｒ、および、（底板部の長辺から立ち上がる長側壁の肉厚）＜（底板部の短辺から立ち上がる短側壁の肉厚）を満足するとともに、底板部のコーナーを結ぶ２つの対角線に対して各対角線を両側から挟むように各対角線から等間隔位置で対角線に平行に引かれた２組の仮想平行線によって囲まれたＸ字状部分の底板部の肉厚が、底板部の残部の肉厚より厚い
ことを特徴とする有底箱型サンドイッチ成形品。 In the bottomed box-type sandwich molded product obtained by injecting the skin layer resin and the core layer resin into the cavity from the gate provided at the center point of the bottom forming portion with a bottom plate portion having at least a substantially rectangular bottom.
The volume of the bottom plate in the triangular region surrounded by the long side of the bottom plate portion and the line segment connecting both ends of the long side and the center point of the bottom plate portion is V 1 , the short side of the bottom plate portion, and both ends of the short side V 2 , (long side length of bottom plate part) / (short side length of bottom plate part) R 2 (1. 35 ≦ R ≦ 2) , V 2 > V 1 , 0.84R ≦ V 2 / V 1 ≦ 0.95R, and (thickness of the long side wall rising from the long side of the bottom plate portion) <(bottom plate portion) (Thickness of the short side wall rising from the short side) of the bottom plate and the two diagonal lines connecting the corners of the bottom plate portion were drawn parallel to the diagonal lines at equal intervals from each diagonal line so that each diagonal line was sandwiched from both sides The thickness of the bottom plate portion of the X-shaped portion surrounded by two sets of virtual parallel lines is thicker than the thickness of the remaining portion of the bottom plate portion. A bottomed box sandwich product.
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