JP2016221964A - 中空体、特に燃料タンクを製造する方法 - Google Patents
中空体、特に燃料タンクを製造する方法 Download PDFInfo
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Abstract
Description
‐パリソンの形態にあるプレフォームのキャビティ中への導入のステップ、
‐パリソンの内側へのコアの導入のステップであって、コアは最初にインサートにぴったり合わせられている、導入のステップ、
‐成形型の閉止であって、それによってキャビティがコアと漏れの無い接触状態になる、閉止のステップ、
‐コアを通じたブロー及び/又はキャビティの後ろからの真空の適用による、キャビティに対するパリソンの押圧のステップ、
を備える。
使用されることが多い1つのコポリマは、エチレン‐ビニルアルコール(EVOH)コポリマである。ポリマ又はコポリマの混合物もまた使用することができ、同様に、例えば、それらに限定されるわけではないが、炭素、塩、及び他の無機誘導体、及び天然繊維又は高分子繊維のような、無機、有機、及び/又は天然フィラーを有するポリマ材料の化合物を使用することができる。また、上述したポリマ又はコポリマの少なくとも1つを備える、互いに固定された積み重ねられた層から成る多層構造を使用することもできる。そのような多層構造は、共押し出しヘッドによって、又は1つ以上の他の層で基材層を完全に又は部分的に被覆する技術によって、得ることができる。この被覆技術の例は、スプレーガンを使用した、基材層上へのプラスティックのスプレーである。使用されることが多い1つのポリマはポリエチレンである。優れた結果が、高密度ポリエチレン(HDPE)で得られた。
より好ましくは、0.5バール<P1−P2<2バールである。
同時に、差圧は、インサートのつぶれ、及び特に管22のつぶれが回避されるように、高すぎることはない。
そのような実施形態は、圧力の供給を、特別な制御手段を有さなくても同期させることができるという利点を有する。減圧手段60は、例えば流量拡大器(flow expander)、比例弁、目盛り付きリーク(calibrated leak)とすることができる。
10 鋳型キャビティ
12、14 シート
15 インサート
16 コア
18 逆止弁
20 弁部材
22 管
24 内部ポート
25 領域
26 移動手段
28、30 シートの端部
32、34 膨張針
42、46 副管
44 主管
47 戻り管
52 副弁
54 主弁
60 減圧手段
70 ベンチュリ装置
P 圧力
P1 第1の圧力
P2 第2の圧力
P1’ 主圧力
P2’ 副圧力
Claims (15)
- 中空体、典型的には、タンクを、プラスティック材料から製造する方法であって、該方法が、
‐成形型内で、プレフォームをシェルに成形するステップと、
‐インサートを前記シェルのうちの一方のシェルの内面に接合するステップであって、前記インサートは前記中空体内に形成される副容積を画定する、ステップと、
‐前記シェルを共に接合して前記成形型を閉止することによって前記中空体を形成するステップ、及び前記シェルによって取り囲まれた主容積に主圧力(P1’)を加えるステップであって、前記主圧力(P1’)を前記主容積に加えつつ、前記副容積に副圧力(P2’)を、前記主容積と前記副容積との間の差圧が、0.20バールより大きく(P1’−P2’>0.20バール)、3.00バールより小さく(P1’−P2’<3.00バール)なるように加える、ステップと、
を備える方法。 - 前記主容積と前記副容積との間の前記差圧が、2.00バールより小さい(P1’−P2’<2.00バール)ことを特徴とする請求項1に記載の方法。
- 前記主容積と前記副容積との間の前記差圧が、0.5バールより大きい(0.5<P1’−P2’)ことを特徴とする請求項1又は2に記載の方法。
- 前記一方のインサートの前記シェルの前記内面への接合は、
前記インサートを前記シェルの中に、前記内面に対して配置するステップ及びコアが前記シェル間に挿入された状態で前記成形型を閉じるステップと、
第1の圧力(P1)を前記シェル及び前記コアによって取り囲まれた主容積に加え、前記副容積に第2の圧力(P2)を加えるステップと、
を備えることを特徴とする請求項1〜3のいずれか一項に記載の方法。 - 前記第1の圧力と前記第2の圧力との間の差圧は、0.20バールより大きく(P1−P2>0.20バール)、3.00バールより小さい(P1−P2<3.00バール)ことを特徴とする請求項4に記載の方法。
- 前記成形型は、2つのキャビティとコアとを備え、前記プレフォームをシェルに成形するステップは、
パリソンの形態にあるプレフォームを、前記キャビティへ導入するステップ;
コアを前記パリソンの内側へ導入するステップであって、前記コアはインサートとぴったり合っている、導入するステップと、
前記キャビティが前記コアと漏れない接触状態になるように前記成形型を閉じるステップと、
前記パリソンを、前記コアを通じてブローすることによって、及び/又はキャビティの後ろを真空にひくことによって、前記キャビティに対して前記パリソンを押圧するステップと、
を備えることを特徴とする請求項1〜5のいずれか一項に記載の方法。 - インサートを前記シェルの内面に接合する前記ステップが、前記コアに取り付けられた装置を使用して、前記インサートを前記パリソンの内壁に設置するステップを備え、前記方法が、前記鋳型を開けて、前記シェルを接合するステップの前に前記コアを引き抜くステップをさらに備えることを特徴とする請求項6に記載の方法。
- 前記主圧力(P1’) 及び前記副圧力(P2’)を加えるステップが、主管と、該主管とは異なる副管と、をそれぞれ使用して行われることを特徴とする請求項1〜7のいずれか一項に記載の方法。
- 前記主管には主弁が設けられ、前記副管には副弁が設けられ、前記方法は、前記主容積及び前記副容積に圧力を加えることを同期するために、前記主弁及び前記副弁を制御するステップをさらに備えることを特徴とする請求項8に記載の方法。
- 前記主圧力(P1’) 及び前記副圧力(P2’)を加えるステップが、主管と、該主管に接続された副管と、をそれぞれ使用して行われ、前記副管には減圧手段が設けられることを特徴とする請求項1〜7のいずれか一項に記載の方法。
- 前記主圧力(P1’) 及び/又は前記副圧力(P2’)を加えるステップが膨張針を通じて行われ、該膨張針によって前記シェルの壁が穿孔されていることを特徴とする請求項1〜10のいずれか一項に記載の方法。
- 前記主圧力(P1’)は、4バールより高く、好ましくは7バールより高いことを特徴とする請求項1〜11のいずれか一項に記載の方法。
- 前記成形型内で、プレフォームをシェルに成形する前記ステップは、前記主圧力(P1’)より低い圧力(P)で行われることを特徴とする請求項1〜12のいずれか一項に記載の方法。
- 前記インサートは通気アセンブリであることを特徴とする請求項1〜13のいずれか一項に記載の方法。
- 請求項1〜14のいずれか一項に記載の方法に従って製造された中空体であって、前記中空体が好ましくは燃料タンクであることを特徴とする、中空体。
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CA993165A (en) | 1971-11-22 | 1976-07-20 | Peter T. Schurman | Plastic article and blow molding method and apparatus |
DE2541765A1 (de) | 1975-09-19 | 1977-03-24 | Kurz Hessental Kg K | Aus kunststoff bestehender hohlkoerper und verfahren zu seiner herstellung |
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