JP4917811B2 - Stackable plastic containers - Google Patents

Stackable plastic containers Download PDF

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JP4917811B2
JP4917811B2 JP2006016698A JP2006016698A JP4917811B2 JP 4917811 B2 JP4917811 B2 JP 4917811B2 JP 2006016698 A JP2006016698 A JP 2006016698A JP 2006016698 A JP2006016698 A JP 2006016698A JP 4917811 B2 JP4917811 B2 JP 4917811B2
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container
weir
chemical solution
shoulder
mouth
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JP2007197040A5 (en
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真貴 塚田
浩正 山口
洋人 児玉
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Aicello Chemical Co Ltd
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Aicello Chemical Co Ltd
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Description

本発明は、集積回路や半導体や液晶を製造するための高純度の薬品や溶剤等の薬液を充填し貯蔵したり輸送したり、排出したりするに用いられるプラスチック容器に関するものである。   The present invention relates to a plastic container used for filling, storing, transporting, and discharging chemical solutions such as high-purity chemicals and solvents for manufacturing integrated circuits, semiconductors, and liquid crystals.

電子デバイスの急速な進歩に伴い、集積回路のような中間製品は、設計基準であるデザインルールに従い、微細化・精密化が進んでいる。そのため集積回路の製造に使用されるフォトレジストのような薬液は、高純度化、高性能化、多種類化し、高価格である。また、集積回路のみならず、半導体や液晶のような中間製品についても同様である。消費者は、それらを組み込んだ最終製品が高性能でかつ安価でなければ購入しない。そのためこれら中間製品の製造過程において、この高価格の薬液を無駄なく使用して、最終製品の価格を抑えなければならない。   With the rapid advancement of electronic devices, intermediate products such as integrated circuits are being miniaturized and refined according to design rules, which are design standards. Therefore, chemicals such as a photoresist used for manufacturing an integrated circuit have high purity, high performance, various types, and high price. The same applies to not only integrated circuits but also intermediate products such as semiconductors and liquid crystals. Consumers do not purchase unless the final product incorporating them is high performance and inexpensive. For this reason, in the manufacturing process of these intermediate products, it is necessary to use the high-priced chemical solution without waste to reduce the price of the final product.

このような薬液は、製造装置へ薬液を供給する装置に組み込まれる容器から供給される。容器に充填された薬液は、その容器の底まで挿入したディップチューブを介し、ポンプで汲み上げられたり、容器を密閉し清浄なガスを吹き込んで加圧して押し出されたりしている。このとき容器の隅々までディップチューブ先端が届かないので、薬液が残留してしまう。この残留薬液を無駄にしたり回収して面倒な廃棄処分をしたりすると、最終製品の価格上昇をもたらす。   Such a chemical solution is supplied from a container incorporated in a device that supplies the chemical solution to the manufacturing apparatus. The chemical solution filled in the container is pumped up by a pump through a dip tube inserted to the bottom of the container, or pushed out by being pressurized by blowing clean gas and sealing the container. At this time, since the tip of the dip tube does not reach every corner of the container, the chemical solution remains. If this residual chemical solution is wasted or collected, and the waste disposal is troublesome, the price of the final product increases.

そこで、容器の口部を下向きにして傾けながら、残留薬液を次の製造バッチで使用する薬液充填容器に継ぎ足している。その際に、できる限り残留薬液を移し替えることが必要である。   Therefore, the residual chemical solution is added to the chemical solution filling container used in the next manufacturing batch while tilting the container with the mouth portion facing downward. At that time, it is necessary to transfer the residual chemical as much as possible.

特許文献1には、口部を、天面の一方の端部に配し、突出上端を積み重ね時の受け部とする上方への突出部を、天面の所要位置に配し、突出部の口部側の側壁を、この側壁の上部が天面における口部側とは反対の端部側に位置するように高さ方向に対し大きい角度で傾斜させた携行缶が、開示されている。しかし、薬液供給装置への配置の都合上、または容器を重ねる際の強度強化の都合上、容器の中央寄りに口部を設けた容器が望まれている。   In Patent Document 1, the mouth portion is arranged at one end portion of the top surface, and the upward projecting portion having the projecting upper end as a receiving portion at the time of stacking is disposed at a required position on the top surface, A carrying can is disclosed in which a side wall on the mouth side is inclined at a large angle with respect to the height direction so that an upper portion of the side wall is located on an end side opposite to the mouth side on the top surface. However, a container having a mouth portion closer to the center of the container is desired for the convenience of arrangement in the chemical solution supply apparatus or for the purpose of enhancing the strength when the containers are stacked.

一方、図4に記載のように、口部を容器の天面の中央を走る溝の中程に設けた場合、口部を下向きにしながら傾けたとき、溝の両脇の肩部に残留薬液が溜まってしまう。この容器を何度も傾け直しても、揺すっても、残余薬液が他方の肩部に移動するだけで、移し替えられないまま残ってしまったり、勢い余って口部から洩れて飛び散り周囲を汚してしまったりする。   On the other hand, as shown in FIG. 4, when the mouth is provided in the middle of the groove running in the center of the top surface of the container, when the mouth is tilted downward, the residual chemical solution is placed on the shoulders on both sides of the groove. Will accumulate. Even if the container is tilted and shaken many times, the remaining drug solution will move to the other shoulder, leaving it untransferred, or spilling from the mouth and splashing around and contaminating the surroundings. I will.

容器胴体から口部にかけて先細りで肩部を有しない容器は、残留薬液をスムーズに排出できるが、積み重ねができず、保管や輸送のスペースをとってしまう上、輸送の際の耐衝撃強度が弱くなってしまう。   Containers that taper from the container body to the mouth and do not have shoulders can discharge residual chemicals smoothly, but they cannot be stacked, take up storage and transportation space, and have low impact resistance during transportation. turn into.

特開2001−130525公報JP 2001-130525 A

本発明は前記の課題を解決するためになされたもので、上向きに口部が設けられ、肩部によって容器同士の積み重ねが可能で十分な積み重ね強度を有し、さらに容器内の薬液を使用した後の残余薬液を完全に排出できるうえ、排出後に煩雑な後処理をしなくて済むプラスチック容器を提供することを目的とする。   The present invention has been made in order to solve the above-described problems, and has a mouth portion facing upward, and can be stacked between containers by a shoulder portion, has sufficient stacking strength, and further uses a chemical solution in the container. It is an object of the present invention to provide a plastic container that can completely discharge the remaining residual chemical solution and that does not require complicated post-processing after the discharge.

前記の目的を達成するためになされた特許請求の範囲の請求項1に記載のプラスチック容器は、薬液を充填する容器の天面の中央を走る溝の底面に、上向きの口部が開けられ、該溝の両脇で該天面のふちに沿って、別な容器を積み重ねる平坦な肩部が設けられ、該溝に沿う該底面のへりの少なくとも一方に、該底面よりも容器内空側へ凹んだ凹みを有する堰が設けられ、該口部が下向きになるように該容器を傾けた際に該肩部に残存していた該薬液が該堰を越えて該口部から排出できるように、該底面と該堰とがそれぞれ傾斜を有し又はテーパー状をなして傾いており、該堰の少なくとも一端が該肩部の端にまで至ったところで、該底面と同じ深さまで前記傾いていることによってそこで該凹みが無くなっていることを特徴とする。 The plastic container according to claim 1, which has been made to achieve the above object, has an upward mouth opened at the bottom of a groove running in the center of the top surface of the container filled with the chemical solution , A flat shoulder for stacking another container is provided along the edge of the top surface on both sides of the groove, and at least one of the bottom edges along the groove is closer to the inner side of the container than the bottom surface. provided weir that have a recessed depressions, drug solution remaining in the shoulder portion when the the mouth portion is tilted container so that the downward can be discharged from the mouth portion exceeds the weir As described above, the bottom surface and the weir are each inclined or tapered, and when the at least one end of the weir reaches the end of the shoulder , the bottom surface and the weir are inclined to the same depth as the bottom surface. Therefore, the dent is eliminated .

請求項2に記載のプラスチック容器は、請求項1に記載されているもので、前記堰が、該底面よりも4〜40mm凹んだ前記凹みを有していることを特徴とする。 A plastic container according to a second aspect is the plastic container according to the first aspect, wherein the weir has the dent recessed by 4 to 40 mm from the bottom surface.

請求項3に記載のプラスチック容器は、請求項1に記載されているもので、前記容器が単層のポリオレフィン樹脂製であり、及び/又は前記容器の最内層がポリオレフィン樹脂製であることを特徴とする。
A plastic container according to claim 3 is the plastic container according to claim 1, wherein the container is made of a single-layer polyolefin resin , and / or the innermost layer of the container is made of a polyolefin resin. And

請求項4に記載のプラスチック容器は、請求項3に記載されているもので、前記ポリオレフィン樹脂が、酸化防止剤無添加のポリエチレンであることを特徴とする。
請求項5に記載のプラスチック容器内の薬液の取り出し方法は、
薬液を充填する容器の天面の中央を走る溝の底面に、上向きの口部が開けられ、該溝の両脇で該天面のふちに沿って、別な容器を積み重ねる平坦な肩部が設けられ、該溝に沿う該底面のへりの少なくとも一方に、該底面よりも容器内空側へ凹んだ凹みを有する堰が設けられ、該口部が下向きになるように該容器を傾けた際に該肩部に残存していた該薬液が該堰を越えて該口部から排出できるように、該底面と該堰とがそれぞれ傾斜を有し又はテーパー状をなして傾いており、該堰の少なくとも一端が該肩部の端にまで至ったところで、該底面と同じ深さまで前記傾いていることによってそこで該凹みが無くなっているプラスチック容器に、薬液を充填する工程、
該薬液を吸引して凡そ排出する工程、
該口部を下向きにしたまま、該堰に沿った方向に該容器を傾け、その後、この堰と垂直な方向に該容器を傾け直すことによって、該肩部に残る該薬液が、該堰を越えて該口部から排出される工程
を有することを特徴とする。
A plastic container according to a fourth aspect is the plastic container according to the third aspect, wherein the polyolefin resin is polyethylene having no antioxidant added thereto.
The method for taking out the chemical solution from the plastic container according to claim 5 is:
An upward mouth is opened at the bottom of the groove running in the center of the top surface of the container filled with the chemical solution, and a flat shoulder for stacking another container is formed along the edge of the top surface on both sides of the groove. When a weir having a dent recessed toward the inner space of the container from the bottom surface is provided on at least one of the bottom edges along the groove, and the container is tilted so that the mouth portion faces downward The bottom surface and the weir are each inclined or tapered so that the chemical solution remaining on the shoulder can be discharged from the mouth over the weir. Filling at least one end of the shoulder to the end of the shoulder, and filling the chemical solution into the plastic container in which the recess is eliminated by tilting to the same depth as the bottom surface;
A step of sucking and discharging the chemical solution;
By tilting the container in a direction along the weir with the mouth facing downward, and then tilting the container in a direction perpendicular to the weir, the chemical solution remaining on the shoulder causes the weir to The process of being discharged from the mouth beyond
It is characterized by having.

本発明のプラスチック容器は、口部と肩部とを略同じ高さにすることができ、また天面の中央よりに口部を設けてもよいので、製造装置への薬液供給装置の容器として、汎用できる。しかも、十分な積み重ね強度を有し、多数の容器の積み重ねが可能であるので、危険物薬品の運送に関する国際連合勧告のUN試験に適合する。この容器によれば、薬液供給後の残余薬液を、完全に容器から排出して効率よく再使用できる。この容器は、排出後の煩雑な後処理を必要としない。   In the plastic container of the present invention, the mouth part and the shoulder part can be made substantially the same height, and since the mouth part may be provided from the center of the top surface, it is used as a container for a chemical supply device to a manufacturing apparatus. Can be general purpose. Moreover, it has sufficient stacking strength and can stack a large number of containers, so it conforms to the UN test of the United Nations recommendation on the transport of hazardous chemicals. According to this container, the remaining chemical solution after supplying the chemical solution can be completely discharged from the container and reused efficiently. This container does not require complicated post-processing after discharge.

以下、本発明の実施例を詳細に説明するが、本発明の範囲はこれらの実施例に限定されるものではない。本発明のプラスチック容器について、その実施の一態様を示す図1を参照して、詳細に説明する。   Examples of the present invention will be described in detail below, but the scope of the present invention is not limited to these examples. The plastic container of the present invention will be described in detail with reference to FIG. 1 showing one embodiment thereof.

このプラスチック容器1は、略円筒形で熱可塑性樹脂製である。その容器1の天面の中央を跨いで走る溝12が設けられている。溝の底部14の中程にキャップが螺合する螺旋溝を有する口部11が開いている。溝12の両脇で天面のふちに沿って、別な容器の積み重ねを可能にする平坦な肩部13が設けられている。溝12の底部14へ、溝12に沿って形成されている底面のへりを成す両辺の脇に、底面14よりも容器1の内空側へ凹んでいる堰15が設けられている。この堰15の両端が、夫々肩部13の端にまで至っている。   The plastic container 1 has a substantially cylindrical shape and is made of a thermoplastic resin. A groove 12 that runs across the center of the top surface of the container 1 is provided. The mouth portion 11 having a spiral groove into which the cap is screwed is opened in the middle of the bottom portion 14 of the groove. Flat shoulders 13 are provided on both sides of the groove 12 along the edge of the top surface to allow stacking of other containers. A weir 15 is provided on the bottom 14 of the groove 12, on both sides of the bottom edge formed along the groove 12. The weir 15 is recessed from the bottom 14 toward the inner space of the container 1. Both ends of the weir 15 reach the end of the shoulder portion 13 respectively.

なお、プラスチック容器1に用いられる熱可塑性樹脂は、溶融押出し成形が可能なものであれば特に限定されない。例えば、ポリエチレン、ポリプロピレン、ポリエステル、ポリ塩化ビニル、ポリアミド、エチレン−ポリビニルアルコール共重合樹脂が挙げられる。プラスチック容器1は、これらのうちの何れかの樹脂の単層からなっていてもよく、またはこれらのうちの異なる樹脂を用いた多層からなっていてもよい。プラスチック容器1は、例えばこれらの熱可塑性樹脂からなるパリソンを、ブロー成形方法して得られる。   In addition, the thermoplastic resin used for the plastic container 1 will not be specifically limited if melt extrusion molding is possible. Examples thereof include polyethylene, polypropylene, polyester, polyvinyl chloride, polyamide, and ethylene-polyvinyl alcohol copolymer resin. The plastic container 1 may consist of a single layer of any of these resins, or may consist of multiple layers using different resins of these. The plastic container 1 is obtained by blow molding a parison made of these thermoplastic resins, for example.

熱可塑性樹脂は、ポリエチレンであることが好ましい。ポリエチレンの好ましい特性は、その密度が0.940g/cm〜0.970g/cm、メルトフローレートが0.01g/10分〜10g/10分である。密度が0.940cm未満であると、プラスチック容器1の剛性が不足し、外圧によりこの容器1が座屈してしまう。一方、0.970cmよりも大きいと、耐ストレスクラッキング性が極端に低下するため、薬液の種類によっては容器が破壊されやすくなる。メルトフローレートが0.01g/10分未満のポリエチレンは非常に硬く、溶融成形には不適である。一方、10g/10分よりも大きなポリエチレンは軟らかく、溶融成形の場合にはドローダウンが激しく、成形が非常に困難であり、さらに耐ストレスクラッキング性が大幅に低下してしまう。薬液が容器からの異物や不純物の混入を嫌うような場合は、熱可塑性樹脂として酸化防止剤無添加のポリエチレンを使わなければならない。 The thermoplastic resin is preferably polyethylene. Preferred properties of polyethylene are a density of 0.940 g / cm 3 to 0.970 g / cm 3 and a melt flow rate of 0.01 g / 10 min to 10 g / 10 min. If the density is less than 0.940 cm 3 , the plastic container 1 has insufficient rigidity, and the container 1 buckles due to external pressure. On the other hand, when it is larger than 0.970 cm 3 , the stress cracking resistance is extremely lowered, so that the container is easily broken depending on the kind of the chemical solution. Polyethylene having a melt flow rate of less than 0.01 g / 10 min is very hard and is not suitable for melt molding. On the other hand, polyethylene larger than 10 g / 10 min is soft, and in the case of melt molding, the drawdown is severe, the molding is very difficult, and the stress cracking resistance is greatly lowered. If the chemical solution dislikes foreign matter or impurities from the container, polyethylene with no antioxidant must be used as the thermoplastic resin.

プラスチック容器1を成型するのに使用されるブロー成型機は、例えば一般に市販されているものであればその型式に制限されない。この容器1を適当な形状とするための成形条件として既知の方法を用いてもよいが、特に限定されるものではない。   If the blow molding machine used for shape | molding the plastic container 1 is generally marketed, for example, it will not be restrict | limited to the type. A known method may be used as a molding condition for making the container 1 into an appropriate shape, but it is not particularly limited.

溝12の底面14と、堰15とは、互いに水平であってもよく、傾斜を有したりテーパー状であったりしてもよい。堰15は底面12の一辺にのみ設けられていてもよく、堰15の一端のみが肩部13の端に至っていてもよい。堰15は、直線状であってもよく湾曲していてもよい。肩部13は円弧状であり溝12は略擂鉢状でその底面を略短冊状とするものであってもよい。肩部13は略半月状であり溝12は平坦な傾斜を有しその底面を略短冊状とするものであってもよい。溝12の両端は、容器1の外周と同様に湾曲していてもよい。容器1は、その側面に手を掛ける窪み16を有していてもよく、その天面に取手17を有していてもよい。容器1は円柱状、樽状、角柱状の何れであってもよいが、面取りされた円柱、直方体であることが好ましい。別な容器1を積み重ね易くずれ難くするため、肩部13に積み重ねられる容器の底部と係合する爪を有していてもよい。   The bottom surface 14 of the groove 12 and the weir 15 may be horizontal to each other, may be inclined, or may be tapered. The weir 15 may be provided only on one side of the bottom surface 12, and only one end of the weir 15 may reach the end of the shoulder portion 13. The weir 15 may be linear or curved. The shoulder portion 13 may have an arc shape, the groove 12 may have a substantially bowl shape, and the bottom surface thereof may have a substantially strip shape. The shoulder portion 13 may have a substantially half-moon shape, and the groove 12 may have a flat slope and its bottom surface may have a substantially strip shape. Both ends of the groove 12 may be curved similarly to the outer periphery of the container 1. The container 1 may have a recess 16 for placing a hand on its side surface, and may have a handle 17 on its top surface. The container 1 may be any of a columnar shape, a barrel shape, and a prismatic shape, but is preferably a chamfered cylinder or a rectangular parallelepiped. In order to make another container 1 easy to stack and difficult to slip, it may have a claw that engages with the bottom of the container stacked on the shoulder 13.

本発明を適用するプラスチック容器を試作した例を実施例1〜3に示し、本発明を適用外のプラスチック容器を試作した例を比較例に示す。   Examples of the plastic container to which the present invention is applied are shown in Examples 1 to 3, and examples of the plastic container to which the present invention is not applied are shown in Comparative Examples.

(実施例1)
単層からなるプラスチック容器の原料として、JIS K6760に従って測定した密度およびメルトフローレートHLMFRがそれぞれ0.956g/cmと8.0g/10分の物性を持つポリエチレンを使用した。これのパリソンを形成した後、ブロー成形して、図1とその平面図および部分断面図である図2とに示された形状で容量20Lのプラスチック容器を作製した。
Example 1
As a raw material for a plastic container composed of a single layer, polyethylene having physical properties of 0.956 g / cm 3 and 8.0 g / 10 min in density and melt flow rate HLMFR measured according to JIS K6760 was used. After forming this parison, it was blow-molded to produce a plastic container with a capacity of 20 L in the shape shown in FIG. 1 and its plan view and FIG. 2 which is a partial sectional view.

この容器の形状は、直径300mm、全高376mmの円筒形である。その容器の最も高い部分を形成する肩部の頂上から40mm下部に形成された口部土台となる溝の底面の中程に口内径Φ48mmの口部を有している。口部の両脇には溝の底面の底辺に沿ってその底面からさらに24mmの深さだけ容器内空側へ凹んだ堰を有している。堰の両端は肩部端面まで伸びている。   The container has a cylindrical shape with a diameter of 300 mm and a total height of 376 mm. A mouth having an inner diameter of Φ48 mm is provided in the middle of the bottom surface of the groove that becomes the mouth base formed 40 mm below the top of the shoulder forming the highest part of the container. On both sides of the mouth portion, there is a weir that is recessed along the bottom of the bottom surface of the groove from the bottom surface by a depth of 24 mm toward the inner side of the container. Both ends of the weir extend to the shoulder end face.

この容器に薬液として純水を充填した。容器に挿入したディップチューブを介しポンプで吸引しながら薬液を凡そ排出した。その際に排出されずに肩部に残った薬液を完全に排出するために、口部を下向きにしながら、容器内空側へ凹んだ堰に沿った方向に容器を傾けた後に、この堰と垂直な方向へ容器を傾けた。すると、肩部に残っていた薬液は全て堰を越え、口部から排出された。このとき、堰を再び越えて肩部に戻る薬液は全く無かった。その結果、容器に残る薬液は0mLであった。しかも薬液は全く容器周辺に飛び散らなかった。   This container was filled with pure water as a chemical solution. The chemical solution was roughly discharged while sucking with a pump through the dip tube inserted into the container. At this time, in order to completely discharge the chemical solution remaining on the shoulder without being discharged, after tilting the container in a direction along the weir recessed toward the inner side of the container with the mouth facing downward, The container was tilted in the vertical direction. Then, all the chemicals remaining on the shoulder crossed the weir and were discharged from the mouth. At this time, there was no chemical solution that crossed the weir again and returned to the shoulder. As a result, the chemical solution remaining in the container was 0 mL. Moreover, no chemical solution was scattered around the container.

(実施例2)
単層からなるプラスチック容器の原料として、JIS K6760に従って測定した密度およびメルトフローレートMFRがそれぞれ0.951g/cmと0.20g/10分の物性を持つポリエチレンを使用した。これのパリソンを形成した後、ブロー成形して、図3に示された形状で容量20Lのプラスチック容器を作製した。
(Example 2)
As a raw material for a plastic container composed of a single layer, polyethylene having physical properties of 0.951 g / cm 3 and 0.20 g / 10 min in density and melt flow rate MFR measured according to JIS K6760 was used. After forming this parison, it was blow- molded to produce a plastic container with a capacity of 20 L in the shape shown in FIG.

この容器の形状は、直径300mm、全高376mmの円筒形である。その容器の最も高い部分を形成する肩部の頂上から40mm下部に形成された口部土台となる溝の底面の中央から100mm程、容器の外周のふち側へずれた位置に、口内径Φ48mmの口部を有している。口部の片脇には溝の底面の底辺に沿って堰を有している。堰の一端は、溝の底面から30mmの深さだけ容器内空側へ凹み肩部の端に至っている。この一端から溝の底面と同じ深さにまで傾斜して形成された堰の他端は、肩部の他端に至ったところで凹みがなくなっている。   The container has a cylindrical shape with a diameter of 300 mm and a total height of 376 mm. 100 mm from the center of the bottom of the groove that forms the mouth base formed 40 mm below the top of the shoulder that forms the highest part of the container, with a mouth inner diameter of Φ48 mm at a position shifted to the outer edge of the container. Has a mouth. On one side of the mouth, there is a weir along the bottom of the bottom of the groove. One end of the weir is recessed from the bottom surface of the groove by a depth of 30 mm toward the inner side of the container and reaches the end of the shoulder. The other end of the weir formed so as to be inclined from the one end to the same depth as the bottom surface of the groove has no recess when it reaches the other end of the shoulder.

この容器に薬液として純水を充填した。容器に挿入したディップチューブを介しポンプで吸引しながら薬液を凡そ排出した。その際に排出されずに肩部に残った薬液を完全に排出するために、口部を下向きにしながら、容器内空側へ凹んだ堰に沿い堰が肩部の端に至って窪んでいる堰の一端への方向へ容器を傾けた後に、この堰と垂直な方向へ容器を傾けた。さらに、これと逆の方向へ容器を傾けた。すると、肩部に残っていた薬液は全て堰を越え、口部から排出された。このとき、堰を再び越えて肩部に戻る薬液は全く無かった。その結果、容器に残る薬液は0mLであった。しかも薬液は全く容器周辺に飛び散らなかった。   This container was filled with pure water as a chemical solution. The chemical solution was roughly discharged while sucking with a pump through the dip tube inserted into the container. In order to completely discharge the chemical solution remaining on the shoulder without being discharged at that time, the weir is recessed down to the end of the shoulder along the weir recessed toward the empty side of the container with the mouth facing downward After tilting the container in the direction toward one end of the container, the container was tilted in a direction perpendicular to the weir. Furthermore, the container was tilted in the opposite direction. Then, all the chemicals remaining on the shoulder crossed the weir and were discharged from the mouth. At this time, there was no chemical solution that crossed the weir again and returned to the shoulder. As a result, the chemical solution remaining in the container was 0 mL. Moreover, no chemical solution was scattered around the container.

(実施例3)
層からなるプラスチック容器の原料として、JIS K6760に従って測定した密度およびメルトフローレートMFRがそれぞれ0.951g/cmと0.20g/10分の物性を持つポリエチレンを最内層原料とし、同じく密度およびMFRがそれぞれ1.19g/cmと1.3g/10分の物性を持つポリ(エチレン−コ−ビニルアルコール)を中間層のバリア剤原料とし、同じく密度およびHLMFRがそれぞれ0.956g/cmと8.0g/10分の物性を持つポリエチレンを最外層原料とし、さらにバリア剤の中間層と、最内層および最外層の各ポリエチレン層とを接着する樹脂として同じく密度およびMFRがそれぞれ0.914g/cmと1.4g/10分の物性を持つポリエチレンに無水マレイン酸がグラフト重合されたポリマーを接着剤原料とした。これのパリソンを形成した後、ブロー成形して、単層にかえて多層としたこと以外は、実施例1と同様なプラスチック容器を作製した。
(Example 3)
As the raw material of the plastic container consisting of five layers, polyethylene having physical properties of 0.951 g / cm 3 and 0.20 g / 10 min measured according to JIS K6760 and the melt flow rate MFR is used as the innermost layer raw material, and the density and Poly (ethylene-co-vinyl alcohol) having physical properties of MFR of 1.19 g / cm 3 and 1.3 g / 10 min, respectively, was used as an intermediate layer barrier agent raw material, and the density and HLMFR were 0.956 g / cm 3 respectively. As the resin for bonding the intermediate layer of the barrier agent to the polyethylene layers of the innermost layer and the outermost layer, the density and MFR are 0.914 g, respectively. / cm 3 and polyethylene maleic anhydride Gras with 1.4 g / 10 min properties The door polymerized polymer was an adhesive material. After forming the parison, a plastic container similar to that of Example 1 was produced, except that it was blow-molded to form a multilayer instead of a single layer.

この容器に薬液として純水を充填し、実施例1と同様に排出させたところ、容器に残る薬液は0mLであり、薬液は全く容器周辺に飛び散らなかった。   When this container was filled with pure water as a chemical solution and discharged in the same manner as in Example 1, the chemical solution remaining in the container was 0 mL, and no chemical solution was scattered around the container.

(比較例)
単層からなるプラスチック容器の原料として、JIS K6760に従って測定した密度およびメルトフローレートHLMFRがそれぞれ0.956g/cmと8.0g/10分の物性を持つポリエチレンを使用した。これのパリソンを形成した後、ブロー成形して、堰を設けなかったこと以外は、実施例1と同様なプラスチック容器を作製した。
(Comparative example)
As a raw material for a plastic container composed of a single layer, polyethylene having physical properties of 0.956 g / cm 3 and 8.0 g / 10 min in density and melt flow rate HLMFR measured according to JIS K6760 was used. After forming this parison, a plastic container similar to that of Example 1 was produced except that blow molding was performed and no weir was provided.

この容器に薬液として純水を充填した。容器に挿入したディップチューブを介しポンプで吸引しながら薬液を凡そ排出した。その際に排出されずに肩部に残った薬液を完全に排出しようとして、口部を下向きにしながら、口部よりも、溝の片脇の肩部が上方となるように容器を傾けた。すると、肩部に残っていた薬液は僅かに口部から排出されたが大半は反対側の肩部に流れ込んでしまった。そこで逆に容器を傾け、これを相互に5回繰り返した。しかし、肩部に残っていた薬液は僅かに口部から排出されだけで、大半は容器内に残ったままであった。しかも、折角、僅かに排出された液の一部が、口部から容器周辺に飛び散ってしまった。   This container was filled with pure water as a chemical solution. The chemical solution was roughly discharged while sucking with a pump through the dip tube inserted into the container. At that time, in order to completely discharge the chemical solution remaining on the shoulder without being discharged, the container was tilted so that the shoulder on one side of the groove was above the mouth while the mouth was facing downward. Then, the chemical solution remaining on the shoulder was slightly discharged from the mouth, but most of it flowed into the opposite shoulder. Therefore, the container was tilted and this was repeated 5 times. However, the drug solution remaining on the shoulder was only slightly discharged from the mouth, and most remained in the container. In addition, a part of the liquid that was slightly discharged has been scattered around the container from the mouth.

本発明のプラスチック容器は、集積回路、半導体、液晶等を製造するための薬品や溶剤のような高純度薬液を充填したり収納したりでき、それらの製造に際してこの薬液を使用した後、容器内に残る薬液を効率よく綺麗に取り出すのに使用できる。取り出した残余薬液は、それらの別なロットの製造の際に、使用することができる。   The plastic container of the present invention can be filled and stored with high-purity chemicals such as chemicals and solvents for manufacturing integrated circuits, semiconductors, liquid crystals, etc. Can be used to efficiently and cleanly remove remaining chemicals. The removed chemical solution can be used in the production of these other lots.

本発明を適用する積み重ね可能なプラスチック容器で二つの堰を有するものの斜視図である。FIG. 3 is a perspective view of a stackable plastic container to which the present invention is applied and having two weirs.

本発明を適用するそのプラスチック容器の平面図および部分断面図である。It is the top view and the fragmentary sectional view of the plastic container to which the present invention is applied.

本発明を適用する別なプラスチック容器で一つの堰を有するものの平面図および部分断面図である。It is the top view and partial sectional view of what has one dam in another plastic container to which this invention is applied.

本発明を適用外のプラスチック容器で一つの堰を有するものの平面図および部分断面図である。It is the top view and partial sectional view of what has one weir in the plastic container which does not apply this invention.

符号の説明Explanation of symbols

1はプラスチック容器、11は口部、12は溝、13は肩部、14は底面、15は堰、16は窪み、17は取手である。   1 is a plastic container, 11 is a mouth, 12 is a groove, 13 is a shoulder, 14 is a bottom surface, 15 is a weir, 16 is a depression, and 17 is a handle.

Claims (5)

薬液を充填する容器の天面の中央を走る溝の底面に、上向きの口部が開けられ、該溝の両脇で該天面のふちに沿って、別な容器を積み重ねる平坦な肩部が設けられ、該溝に沿う該底面のへりの少なくとも一方に、該底面よりも容器内空側へ凹んだ凹みを有する堰が設けられ、該口部が下向きになるように該容器を傾けた際に該肩部に残存していた該薬液が該堰を越えて該口部から排出できるように、該底面と該堰とがそれぞれ傾斜を有し又はテーパー状をなして傾いており、該堰の少なくとも一端が該肩部の端にまで至ったところで、該底面と同じ深さまで前記傾いていることによってそこで該凹みが無くなっていることを特徴とするプラスチック容器。 An upward mouth is opened at the bottom of the groove running in the center of the top surface of the container filled with the chemical solution, and a flat shoulder for stacking another container is formed along the edge of the top surface on both sides of the groove. provided, on at least one of edge of the bottom surface along the groove, weirs that have a recess recessed into the barrel cavity side than the bottom surface is provided, inclined container to the mouth portion facing down The bottom surface and the weir are each inclined or tapered so that the chemical solution remaining on the shoulder can be discharged from the mouth over the weir, A plastic container characterized in that when the at least one end of the weir reaches the end of the shoulder, the dent is eliminated by the inclination to the same depth as the bottom surface . 前記堰が、該底面よりも4〜40mm凹んだ前記凹みを有していることを特徴とする請求項1に記載のプラスチック容器。 The plastic container according to claim 1, wherein the weir has the recess that is recessed by 4 to 40 mm from the bottom surface. 前記容器が単層のポリオレフィン樹脂製であり、及び/又は前記容器の最内層がポリオレフィン樹脂製であることを特徴とする請求項1に記載のプラスチック容器。 The plastic container according to claim 1, wherein the container is made of a single layer of polyolefin resin and / or the innermost layer of the container is made of polyolefin resin . 前記ポリオレフィン樹脂が、酸化防止剤無添加のポリエチレンであることを特徴とする請求項3に記載のプラスチック容器。   The plastic container according to claim 3, wherein the polyolefin resin is polyethylene having no antioxidant added thereto. 薬液を充填する容器の天面の中央を走る溝の底面に、上向きの口部が開けられ、該溝の両脇で該天面のふちに沿って、別な容器を積み重ねる平坦な肩部が設けられ、該溝に沿う該底面のへりの少なくとも一方に、該底面よりも容器内空側へ凹んだ凹みを有する堰が設けられ、該口部が下向きになるように該容器を傾けた際に該肩部に残存していた該薬液が該堰を越えて該口部から排出できるように、該底面と該堰とがそれぞれ傾斜を有し又はテーパー状をなして傾いており、該堰の少なくとも一端が該肩部の端にまで至ったところで、該底面と同じ深さまで前記傾いていることによってそこで該凹みが無くなっているプラスチック容器に、薬液を充填する工程、An upward mouth is opened at the bottom of the groove running in the center of the top surface of the container filled with the chemical solution, and a flat shoulder for stacking another container is formed along the edge of the top surface on both sides of the groove. When a weir having a dent recessed toward the inner space of the container from the bottom surface is provided on at least one of the bottom edges along the groove, and the container is tilted so that the mouth portion faces downward The bottom surface and the weir are each inclined or tapered so that the chemical solution remaining on the shoulder can be discharged from the mouth over the weir. Filling at least one end of the shoulder to the end of the shoulder, and filling the chemical solution into the plastic container in which the recess is eliminated by tilting to the same depth as the bottom surface;
該薬液を吸引して凡そ排出する工程、  A step of sucking and discharging the chemical solution;
該口部を下向きにしたまま、該堰に沿った方向に該容器を傾け、その後、この堰と垂直な方向に該容器を傾け直すことによって、該肩部に残る該薬液が、該堰を越えて該口部から排出される工程  By tilting the container in a direction along the weir with the mouth facing downward, and then tilting the container in a direction perpendicular to the weir, the chemical solution remaining on the shoulder causes the weir to The process of being discharged from the mouth beyond
を有することを特徴とするプラスチック容器内の薬液の取り出し方法。A method for taking out a chemical solution from a plastic container.
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