JP5103247B2 - Molding device for stretch blow of container having mouth at upper corner - Google Patents

Molding device for stretch blow of container having mouth at upper corner Download PDF

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JP5103247B2
JP5103247B2 JP2008091196A JP2008091196A JP5103247B2 JP 5103247 B2 JP5103247 B2 JP 5103247B2 JP 2008091196 A JP2008091196 A JP 2008091196A JP 2008091196 A JP2008091196 A JP 2008091196A JP 5103247 B2 JP5103247 B2 JP 5103247B2
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rod
preform
blow
mold
tip
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JP2009241429A (en
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剛一 望月
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Aoki Technical Laboratory Inc
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この発明は、上隅部に口部を有する容器の延伸ブロー成形に用いられる金型装置に関するものである。   The present invention relates to a mold apparatus used for stretch blow molding of a container having a mouth at an upper corner.

偏心首部付きボトルの延伸ブロー成形手段として、プリフォームの胴部を後加工により傾斜形成し、そのプリフォームをブロー型のキャビティにネック型により保持して、ブローコアに斜めに挿通した延伸ロッドにより胴部をキャビティの片側に斜めに延伸することが行われている。
特表２００３−５２３２８９号公報 As a means for stretch blow molding of bottles with an eccentric neck, the preform body is inclined by post-processing, the preform is held by a neck mold in a blow mold cavity, and the body is formed by a stretch rod inserted obliquely through the blow core. The part is obliquely extended to one side of the cavity.
Special table 2003-523289 gazette

上記従来技術の延伸ブロー成形手段では、ブローコアに延伸ロッドの挿通孔を穿設しており、その挿通孔をブローエアの通路に兼用していることから、挿通孔の孔径が延伸ロッドの軸径よりも必然的に大径となる。このためロッド周囲のエア通路となる間隙が延伸ロッドの遊びとなって延伸ロッドが横に振れ、これによりロッド先端に位置ずれが生じ易くなって、プリフォームの内底面への当接が設定通りに行えず、容器の片側のコーナ部位が薄肉化したり、延伸途中で胴部下側が破損することがある。またブローコアに延伸ロッドを挿通しているので、傾斜角度の変更を要する場合には、ブローコアと共に交換することになり、交換ごとにブローコアとネック型との嵌合調整を行う必要がある。   In the above-described stretch blow molding means of the prior art, an insertion hole for a stretching rod is formed in the blow core, and the insertion hole is also used as a blow air passage, so that the hole diameter of the insertion hole is larger than the shaft diameter of the stretching rod. Inevitably becomes a large diameter. For this reason, the gap that forms the air passage around the rod becomes play of the stretching rod, and the stretching rod swings sideways, which tends to cause displacement of the rod tip, and the contact with the inner bottom surface of the preform is as set. The corner portion on one side of the container may be thinned, or the lower part of the trunk may be damaged during stretching. In addition, since the extending rod is inserted through the blow core, when the inclination angle needs to be changed, it is replaced together with the blow core, and it is necessary to adjust fitting between the blow core and the neck type for each replacement.

この発明は上記従来の課題を解決するために考えられたものであって、その目的は、ガイドブッシュの採用によりエア通路と延伸ロッドのガイド孔の両方をブローコア内に形成し、それにより延伸ロッドの横振れによるロッド先端の位置ずれを防止して、プリフォームの胴部を傾斜形成することなく、真っすぐな状態で上隅部に口部を有する容器の成形が可能な延伸ブロー用金型装置を提供することにある。   The present invention has been conceived in order to solve the above-described conventional problems. The purpose of the present invention is to form both the air passage and the guide hole of the extension rod in the blow core by adopting the guide bush, thereby extending the extension rod. Stretch blow mold apparatus capable of forming a container having a mouth at the upper corner in a straight state without preventing the position of the rod tip from being displaced due to lateral vibration of the preform, and without forming the preform body at an inclination. Is to provide.

上記目的によるこの発明は、キャビティの中心線に対して成形面を傾斜形成し、プリフォームの挿入穴を中心線上に設けたブロー金型と、
その挿入穴上に嵌合してブロー金型と型閉し、射出成形した真っすぐなプリフォームを挿入穴からキャビティの中心線Ａ−Ａ上に保持するネック型と、
円筒形で先端部を上記ネック型との嵌合段部に形成したブローコアと、
そのブローコアに斜めに挿通した延伸ロッドとからなり、
上記ブローコア内に、長軸でガイド孔を上記キャビティの傾斜成形面と同方向に、かつ延伸ロッドの軸心線Ｂ−Ｂがキャビティ内の垂直なプリフォームの内底面の偏心部位に位置する角度に斜設したガイドブッシュを、ブッシュ周囲と先端とにエア通路となる間隙を空けて同心円に嵌装し、そのガイドブッシュに上記延伸ロッドを挿通して、押圧端子を取付けたロッド先端をプリフォーム内底面の偏心部位に臨ませてなるというものであり、上記ガイド孔の傾斜角度は、プリフォームのネック部口径と胴部長さにより設定される、というものである。 The present invention according to the above object has a blow mold in which a molding surface is inclined with respect to the center line of the cavity, and a preform insertion hole is provided on the center line.
A neck mold that fits on the insertion hole, closes the blow mold, and holds the injection-molded straight preform on the center line AA of the cavity from the insertion hole;
A blow core having a cylindrical shape and a tip formed at a fitting step with the neck type,
It consists of a stretch rod inserted diagonally through the blow core,
In the blow core, an angle at which the guide hole with the long axis is in the same direction as the inclined molding surface of the cavity, and the axial line BB of the stretching rod is located at the eccentric portion of the inner bottom surface of the vertical preform in the cavity The guide bush that is obliquely mounted on the guide bush is fitted into a concentric circle with a gap as an air passage between the bush periphery and the tip, the extension rod is inserted into the guide bush, and the tip of the rod to which the pressing terminal is attached is preformed. The guide hole faces the eccentric portion of the inner bottom surface, and the inclination angle of the guide hole is set by the neck diameter and the trunk length of the preform.

また上記押圧端子の下面は、垂直に保持された上記プリフォームの内底面の半部とコーナー部とにわたる曲面と対応する押圧面に形成され、上面のコーナー部側の偏心部位をロッド先端に取付けてなる、というものである。   The lower surface of the pressing terminal is formed on a pressing surface corresponding to a curved surface extending between the half of the inner bottom surface and the corner portion of the preform held vertically, and an eccentric portion on the corner portion side of the upper surface is attached to the rod end. It is to become.

上記構成では、延伸ロッドのガイド孔を斜設したガイドブッシュの嵌装によりエア通路を形成したので、ガイド孔の孔径が延伸ロッドが摺動する直径で済み、ロッド周囲に余分な間隙がないことから、伸長作動時のロッド振れが起こらず、ロッド先端によるプリフォーム内底面の押圧位置が常に一定となるので、ロッド先端の横ずれによる胴部下部への干渉も生じないから、プリフォームの胴部を予め屈曲することなく真っすぐな状態で延伸ブロー成形することができる。したがって、上隅部に口部を有する容器を中央に口部がある通常の容器と同様に延伸ブロー成形することができる。   In the above configuration, since the air passage is formed by fitting the guide bush with the guide rod of the extension rod obliquely installed, the diameter of the guide hole is the diameter that the extension rod slides, and there is no extra gap around the rod. Therefore, there is no rod deflection at the time of extension operation, and the pressing position of the inner bottom surface of the preform by the rod tip is always constant, so there is no interference with the trunk lower part due to lateral displacement of the rod tip. Can be stretch blow molded in a straight state without being bent in advance. Therefore, a container having a mouth at the upper corner can be stretch blow molded in the same manner as a normal container having a mouth at the center.

またガイドブッシュのガイド孔の孔径も、ガイド孔をエア通路に兼用する場合よりも小さくなることから、ガイドブッシュが限られた平断面積のものであっても、必要とされる傾斜角度を設定することかでき、傾斜角度の変更を要する容器の成形の場合には、ブローコアはそのままにしてガイドブッシュを、変更角度に適合したガイド孔を穿設したものに交換するだけで済むので、交換後にネック型とブローコアの嵌合調整を行う必要もなくなる。   The diameter of the guide bush guide hole is also smaller than when the guide hole is also used as an air passage, so the required inclination angle is set even if the guide bush has a limited cross-sectional area. In the case of molding a container that requires a change in the inclination angle, it is only necessary to replace the guide bush with a guide hole adapted to the change angle without changing the blow core. There is no need to adjust the fitting between the neck mold and the blow core.

図中１は機台上面に設置した一対の割型によブロー金型で、内部に容器成形用のキャビティ１０を有する。このキャビティ１０は、図４に示すような縦断面形状が四辺形で四隅部が傾斜し、上部の一隅部にネック部を一体形成した容器２０をブロー形成するキャビティで、キャビティ中心線Ａ−Ａに対し上下成形面１０ａ，１０ａと両側成形面１０ｂ，１０ｂ′を傾斜形成して対角線上の上下隅部を中心線Ａ−Ａ上に位置させ、その上隅部にネック型３が嵌合して型閉する凹所が形成してある。   In the figure, reference numeral 1 denotes a pair of split molds installed on the upper surface of the machine base, and has a cavity 10 for forming a container inside. This cavity 10 is a cavity that blows and forms a container 20 in which the longitudinal cross-sectional shape shown in FIG. 4 is a quadrilateral, the four corners are inclined, and a neck part is integrally formed at one corner of the upper part. On the other hand, the upper and lower molding surfaces 10a and 10a and the both side molding surfaces 10b and 10b 'are inclined so that the upper and lower corners on the diagonal are positioned on the center line AA, and the neck mold 3 is fitted to the upper corner. A recess that closes the mold is formed.

上記ネック型３は、機台上部の昇降自在な基盤４の下側に可動自在に取付けた移送板５の開口部位の下面に、水平方向（図面では前後方向）に開閉自在に取付けた一対の割型からなる周知構造のもので、予め射出成形されたプリフォーム２のネックを保持して、該プリフォーム２を垂直に保持している。このネック型３にはブローコア６が基盤４の上から、該基盤４のブロー金型上の部位に穿設した開口４ａと、該開口と重合した移送板５の開口５ａを通して挿入される。   The neck mold 3 is a pair of lower and opener plates attached to the lower surface of the opening portion of the transfer plate 5 that is movably attached to the lower side of the base 4 that can be raised and lowered. It has a known structure consisting of a split mold, holds the neck of a preform 2 preformed by injection molding, and holds the preform 2 vertically. A blow core 6 is inserted into the neck mold 3 from above the base 4 through an opening 4a formed in a portion of the base 4 on the blow mold and an opening 5a of the transfer plate 5 overlapped with the opening.

上記ブローコア６は、円筒形で先端部をネック型３との嵌合段部に形成して、先端をプリフォーム２のネック内に気密に嵌合できるようにしてある。また内部には長軸のガイドブッシュ７が上端開口から、先端部内までブッシュ周囲と先端とにエア通路８となる間隙を空けて、後端周囲のフランジがガイドブッシュ７の段部と嵌合するところまで嵌め込んで同心円に装着してある。   The blow core 6 has a cylindrical shape and a tip portion formed at a fitting step portion with the neck mold 3 so that the tip can be hermetically fitted into the neck of the preform 2. Inside, a long shaft guide bush 7 is provided with an air passage 8 between the bushing and the tip from the opening at the upper end to the inside of the tip, and a flange around the rear end is fitted to the step portion of the guide bush 7. It is fitted so far as to be installed concentrically.

このガイドブッシュ７には、延伸ロッド９のガイド孔１１が、上記キャビティ１０の傾斜成形面１１ｂと同方向に、かつ延伸ロッドの軸心線Ｂ−Ｂがキャビティ内の垂直な上記プリフォーム２の内底面の偏心部位に位置する角度に斜めに穿設してあり、その先端開口の内周囲にはガスケット１２が取付けてある。上記延伸ロッド９はガイドブッシュ７の上方から先端をガイド孔１１に差込み、ガスケット１２を通して先端部がブローコア６から突出するところまでガイドブッシュ７に挿通してある。   In the guide bush 7, the guide hole 11 of the extending rod 9 is in the same direction as the inclined molding surface 11 b of the cavity 10, and the axis 2 of the extending rod is perpendicular to the preform 2 in the cavity. It is drilled obliquely at an angle located at an eccentric portion of the inner bottom surface, and a gasket 12 is attached to the inner periphery of the tip opening. The extension rod 9 is inserted into the guide bush 7 from the upper side of the guide bush 7 to the guide hole 11 through the gasket 12 until the tip protrudes from the blow core 6.

また延伸ロッド９の傾斜角度は、プリフォーム２のネック部口径と胴部長さとにより設定される上記ガイド孔１１の傾斜角度により定められ、傾斜角度の変更を要する場合には、ガイドブッシュ７を変更角度に適合したガイド孔１１を穿設したガイドブッシュに交換するだけで済むようになる。   The inclination angle of the stretching rod 9 is determined by the inclination angle of the guide hole 11 set by the neck diameter and the trunk length of the preform 2, and the guide bush 7 is changed when the inclination angle needs to be changed. It is only necessary to replace the guide bush with the guide hole 11 adapted to the angle.

またガイド孔１１の孔径は延伸ロッド９が摺動できる直径でよいので、ロッド周囲の間隙をエア通路とする場合よりも小径となり、ガイドブッシュ７の平断面積における孔径が占める面積も小さくなることから、伸長作動時にロッド振れの原因となるロッド周囲の余分な間隙がなくなり、ロッド先端によるプリフォーム内底面の押圧位置が常に一定となる。これによりロッド先端の横ずれによる胴部への干渉で生じがちな延伸途中での破損も生じなくなる。   The guide hole 11 may have a diameter that allows the extending rod 9 to slide, so that the guide hole 11 has a smaller diameter than the air passage around the rod, and the area occupied by the hole diameter in the plane cross-sectional area of the guide bush 7 is also reduced. Therefore, there is no extra space around the rod that causes rod deflection during the extension operation, and the pressing position of the inner bottom surface of the preform by the rod tip is always constant. As a result, breakage during stretching, which tends to occur due to interference with the body due to lateral displacement of the rod tip, is prevented.

上記延伸ロッド９は、ロッド先端にプリフォーム２の内底面を押圧する端子１３を備え、その押圧端子１３は延伸ロッド９をガイドブッシュ７に挿通したのちに、ロッド先端にねじ着して取付けている。またロッド後端には上面を曲面に形成した係合子１４が一体形成してある。   The extending rod 9 is provided with a terminal 13 that presses the inner bottom surface of the preform 2 at the tip of the rod, and the pressing terminal 13 is inserted into the guide bush 7 and then screwed onto the rod end. Yes. An engaging element 14 having a curved upper surface is integrally formed at the rear end of the rod.

上記押圧端子１３は、平面形状が円形で下面が押圧面に形成されており、その押圧面は垂直に保持されたプリフォームの内底面の半部とコーナー部とにわたる曲面と対応する曲面に形成してある。また上面は平坦面でその上面のコーナー部側の偏心部位をロッド先端に取付けて、押圧端子１３がプリフォーム６の内底面の半部を押圧するようにしてある。   The pressing terminal 13 has a circular planar shape and a lower surface formed on the pressing surface, and the pressing surface is formed in a curved surface corresponding to a curved surface extending between the half portion and the corner portion of the inner bottom surface of the preform held vertically. It is. The upper surface is a flat surface, and an eccentric part on the corner portion side of the upper surface is attached to the tip of the rod so that the pressing terminal 13 presses the half of the inner bottom surface of the preform 6.

上記ブローコア６とガイドブッシュ７は、上記基盤４の上面に立設した周知の延伸駆動機構１５（例えば、特開２００４−２６２０５２号参照）の下位の保持板１６に、ガイドブッシュ７の後端部周囲をエア流入孔８ａを穿設したホルダー１７により保持して取付けてある。また上記延伸ロッド９は上位のロッド取付板１８に、後端の係合子１４を取付板下側の嵌合部材１９に横スライド自在に嵌合して取付けてある。これにより延伸ロッド９はロッド取付板１８と共に移動して、降下時には後端のブローコア６の先端から伸長し、上昇時には嵌合子１４が嵌合部材１９により引っ張られて、ブローコア６の先端元の位置に戻るようになる。   The blow core 6 and the guide bush 7 are connected to a rear end portion of the guide bush 7 on a lower holding plate 16 of a known stretching drive mechanism 15 (for example, see Japanese Patent Application Laid-Open No. 2004-262052) standing on the upper surface of the base 4. The periphery is attached by being held by a holder 17 having an air inflow hole 8a. The extending rod 9 is attached to the upper rod attaching plate 18 by fitting the rear end engaging member 14 to the fitting member 19 on the lower side of the attaching plate so as to be slidable laterally. As a result, the extending rod 9 moves together with the rod mounting plate 18 and extends from the front end of the blow core 6 at the rear end when lowered, and the fitting 14 is pulled by the fitting member 19 at the time of ascent, so To return to.

上記構成では、上記移送板５によりプリフォーム２を垂直に保持したネック型３が型開したブロー金型１の中央に移動してきて停止すると、基盤４が移送板５と共に降下して、ブロー金型１と移送板下面のネック型３とが型閉する。   In the above configuration, when the neck mold 3 holding the preform 2 vertically by the transfer plate 5 moves to the center of the opened blow mold 1 and stops, the base 4 is lowered together with the transfer plate 5 to blow the blow mold. The mold 1 and the neck mold 3 on the lower surface of the transfer plate are closed.

この型閉後に、延伸駆動機構１５の下位の保持板９と上位のロッド取付板１８とが一緒に降下して、延伸ロッド９を斜めに挿通したブローコア６が開口４ａ，５ａからネック型３に挿入され、先端部がネック型内の段部と気密に嵌合する。またコア先端がプリフォーム２のネック開口内に挿入されて、その開口を気密にシールする。   After closing the mold, the lower holding plate 9 and the upper rod mounting plate 18 of the extension drive mechanism 15 are lowered together, and the blow core 6 inserted obliquely through the extension rod 9 is moved from the openings 4a and 5a to the neck mold 3. Inserted, the tip end fits airtightly with the step in the neck mold. The tip of the core is inserted into the neck opening of the preform 2 and hermetically seals the opening.

このブローコア６によるネック型内の気密シールと同時に、ブローコア６の先端から斜めに突出している延伸ロッド９の先端部が、上記ガイド孔１１によって真っすぐなプリフォーム２に対し斜めに、かつロッド先端の押圧端子１３がプリフォーム２の内底面の偏心部位に達するところまで挿入される。   Simultaneously with the airtight seal in the neck mold by the blow core 6, the end portion of the extending rod 9 projecting obliquely from the front end of the blow core 6 is slanted with respect to the straight preform 2 by the guide hole 11 and the end of the rod end. The pressing terminal 13 is inserted until it reaches the eccentric portion of the inner bottom surface of the preform 2.

上記ネック型３とブローコア６の嵌合及び延伸ロッド９のプリフォーム内への挿入が完了すると、上位のロッド取付板１８が降下しながら延伸ロッド９の後端を圧迫して押し下げる。これにより延伸ロッド９の先端部がブローコア６から長くキャビティ底面へと斜めに伸長する。この伸長に伴なうロッド後端の高さ位置の変化に応じてロッド後端が横スライドするので、延伸ロッド９が傾斜していてもロッド取付板１８による押下げ力によりスムーズに伸長し、プリフォーム２の底面を偏心位置の上記押圧端子１３により押圧してゆく。   When the fitting of the neck mold 3 and the blow core 6 and the insertion of the extending rod 9 into the preform are completed, the upper rod mounting plate 18 descends and presses and pushes down the rear end of the extending rod 9. Thereby, the front-end | tip part of the extending | stretching rod 9 is extended diagonally from the blow core 6 to the cavity bottom face. Since the rear end of the rod slides sideways in accordance with the change in the height position of the rear end of the rod accompanying this extension, even if the extension rod 9 is inclined, it is smoothly extended by the pressing force of the rod mounting plate 18, The bottom surface of the preform 2 is pressed by the pressing terminal 13 at an eccentric position.

上記伸長作動と同時又は若干遅れてブローコア６からプリフォーム内にエアがブローされる。ブローエアはホルダー１７のエア流入孔８ａから、ブローコア６とガイドブッシュ７との間に形成したエア通路８を経て、コア開口からプリフォーム内に圧入され、プリフォーム胴部を上下及び左右両側の成形面１０ａ，１０ａ，１０ｂ，１０ｂ′まで上部から膨張してゆく。この際、ブローエアはガイドブッシュ７に穿設したガイド孔１１とエア通路８が、ガイド孔１１の先端開口内に設けたガスケット１２により遮断されているので、ガイド孔１１からガス漏れとなって流出することはない。   Air is blown from the blow core 6 into the preform at the same time as or slightly after the extension operation. Blow air is pressed into the preform from the air opening 8a of the holder 17 through the air passage 8 formed between the blow core 6 and the guide bush 7, and the preform body is formed on both the upper and lower sides and the left and right sides. The surfaces 10a, 10a, 10b, and 10b 'expand from the top. At this time, the blow air flows out as a gas leak from the guide hole 11 because the guide hole 11 formed in the guide bush 7 and the air passage 8 are blocked by the gasket 12 provided in the front end opening of the guide hole 11. Never do.

また押圧端子１３は、偏心部位をロッド先端に取付けて延伸ロッド９に設けられていることと、下面がプリフォーム内底面の半部とコーナー部とにわたる曲面と対応する押圧面に形成されていることから、プリフォーム２は図３の鎖線で示すように、延伸ロッド９の傾斜方向に引っ張られて胴部が斜めに延伸されてゆくようになる。   Further, the pressing terminal 13 is formed on the pressing surface corresponding to the curved surface extending from the half portion of the preform inner bottom surface to the corner portion, with the eccentric portion attached to the rod tip and provided on the extending rod 9. For this reason, as shown by the chain line in FIG. 3, the preform 2 is pulled in the tilting direction of the stretching rod 9 and the body portion is stretched obliquely.

この延伸によりプリフォーム２の胴部が底部とともに、キャビティ中心線Ａ−Ａよりも遠い側の成形面１０ｂ′の方に、延伸ロッド９の傾斜角度分だけ片寄せられてゆき、キャビティ中心線Ａ−Ａからの反対側の成形面１０ｂとの距離差が小さくなって、エアブローによる胴部の伸び代の差も小さくなる。このためキャビティ中心線Ａ−Ａからの距離差による胴部やコーナ部分の偏肉が減少し、特に胴下部の薄肉化が防止されて全体的に肉厚分布が均一なものとなる。   By this stretching, the body portion of the preform 2 together with the bottom portion is shifted toward the molding surface 10b ′ farther from the cavity center line AA by the inclination angle of the stretching rod 9, and the cavity center line A The difference in distance from the molding surface 10b on the opposite side from -A is reduced, and the difference in the allowance for expansion of the body due to air blow is also reduced. For this reason, the uneven thickness of the body part and the corner part due to the difference in distance from the cavity center line A-A is reduced.

これによりプリフォーム２のネック部が上隅部に残って口部２０′となった容器２０の延伸ブロー成形を、通常の容器の場合と同様にプリフォーム２を垂直に保持して真っすぐな状態で行い得るので、これまでのようにプリフォームの胴部を傾斜形成したり、成形前に二次加工により屈曲形成したりする必要がなくなり、成形工程の簡素化ともなる。   As a result, the stretch blow molding of the container 20 in which the neck portion of the preform 2 remains in the upper corner portion and becomes the mouth portion 20 'is straightened while the preform 2 is held vertically as in the case of a normal container. Therefore, there is no need to form the body of the preform in an inclined manner or bend it by secondary processing before molding as in the past, and the molding process can be simplified.

この発明に係わる延伸ブロー成形用金型装置の型開時の縦断面図である。It is a longitudinal cross-sectional view at the time of mold opening of the mold apparatus for stretch blow molding concerning this invention. 同じく型閉時の縦断面図である。It is a longitudinal section similarly at the time of mold closing. 同じく延伸ブロー成形時の縦断面図である。It is the longitudinal cross-sectional view at the time of stretch blow molding similarly. この発明に係わる延伸ブロー成形用金型装置により成形した上隅部に口部を有する容器の正面図ある。It is a front view of the container which has a mouth part in the upper corner part shape | molded with the mold apparatus for stretch blow molding concerning this invention.

符号の説明Explanation of symbols

１ ブロー金型
２ プリフォーム
３ ネック型
４ 基盤
５ 移送板
６ ブローコア
７ ガイドブッシュ
８ エア通路
８ａ エア流入口
９ 延伸ロッド
１０ キャビティ
１０ａ，１０ｂ 成形面
１１ ガイド孔
１２ ガスケット
１３ 押圧端子
１４ 係合子
２０ 容器
２０′ 口部 DESCRIPTION OF SYMBOLS 1 Blow mold 2 Preform 3 Neck type 4 Base 5 Transfer plate 6 Blow core 7 Guide bush 8 Air passage 8a Air inlet 9 Stretching rod 10 Cavity 10a, 10b Molding surface 11 Guide hole 12 Gasket 13 Press terminal 14 Engagement 20 Container 20 'mouth

Claims (3)

キャビティの中心線に対して成形面を傾斜形成し、プリフォームの挿入穴を中心線上に設けたブロー金型と、
その挿入穴上に嵌合してブロー金型と型閉し、射出成形した真っすぐなプリフォームを挿入穴からキャビティの中心線Ａ−Ａ上に保持するネック型と、
円筒形で先端部を上記ネック型との嵌合段部に形成したブローコアと、
そのブローコアに斜めに挿通した延伸ロッドとからなり、
上記ブローコア内に、長軸でガイド孔を上記キャビティの傾斜成形面と同方向に、かつ延伸ロッドの軸心線Ｂ−Ｂがキャビティ内の垂直なプリフォームの内底面の偏心部位に位置する角度に斜設したガイドブッシュを、ブッシュ周囲と先端とにエア通路となる間隙を空けて同心円に嵌装し、そのガイドブッシュに上記延伸ロッドを挿通して、押圧端子を取付けたロッド先端をプリフォーム内底面の偏心部位に臨ませてなることを特徴とする上隅部に口部を有する容器の延伸ブロー成形用金型装置。 A blow mold in which a molding surface is inclined with respect to the center line of the cavity, and a preform insertion hole is provided on the center line;
A neck mold that fits on the insertion hole, closes the blow mold, and holds the injection-molded straight preform on the center line AA of the cavity from the insertion hole;
A blow core having a cylindrical shape and a tip formed at a fitting step with the neck type,
It consists of a stretch rod inserted diagonally through the blow core,
In the blow core, an angle at which the guide hole with the long axis is in the same direction as the inclined molding surface of the cavity, and the axial line BB of the stretching rod is located at the eccentric portion of the inner bottom surface of the vertical preform in the cavity The guide bush that is obliquely mounted on the guide bush is fitted into a concentric circle with a gap as an air passage between the bush periphery and the tip, the extension rod is inserted into the guide bush, and the tip of the rod to which the pressing terminal is attached is preformed. A mold apparatus for stretch blow molding of a container having a mouth portion at an upper corner portion, facing an eccentric portion of an inner bottom surface. 上記ガイド孔の傾斜角度は、プリフォームのネック部口径と胴部長さにより設定されることを特徴とする請求項１記載の上隅部に口部を有する容器の延伸ブロー成形用金型装置。   2. The mold apparatus for stretch blow molding of a container having a mouth portion at an upper corner portion according to claim 1, wherein the inclination angle of the guide hole is set by a neck diameter and a body length of the preform. 上記押圧端子の下面は、垂直に保持された上記プリフォームの内底面の半部とコーナー部とにわたる曲面と対応する押圧面に形成され、上面のコーナー部側の偏心部位をロッド先端に取付けてなることを特徴とする請求項１記載の上隅部に口部を有する容器の延伸ブロー成形用金型装置。   The lower surface of the pressing terminal is formed on a pressing surface corresponding to a curved surface extending between the half of the inner bottom surface and the corner portion of the preform held vertically, and an eccentric portion on the corner portion side of the upper surface is attached to the rod tip. 2. A mold apparatus for stretch blow molding of a container having a mouth at the upper corner of claim 1.
JP2008091196A 2008-03-31 2008-03-31 Molding device for stretch blow of container having mouth at upper corner Expired - Fee Related JP5103247B2 (en)

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