JP5165268B2 - Method for producing hollow molded body and hollow molded body - Google Patents

Method for producing hollow molded body and hollow molded body Download PDF

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JP5165268B2
JP5165268B2 JP2007095945A JP2007095945A JP5165268B2 JP 5165268 B2 JP5165268 B2 JP 5165268B2 JP 2007095945 A JP2007095945 A JP 2007095945A JP 2007095945 A JP2007095945 A JP 2007095945A JP 5165268 B2 JP5165268 B2 JP 5165268B2
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hollow molded
molded body
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JP2008254226A (en
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健司 岩崎
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Kyoraku Co Ltd
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本発明は、ブロー成形およびシートブロー成形により形成される中空成形体の製造方法及び中空成形体に関するものである。 The present invention relates to a manufacturing method and a hollow molded body of the hollow molded body formed by blow molding and sheet Toburo molding.

従来、ノズルにより確実にエアの吹き込み孔または排出口を開口させるブロー成形方法が知られている。特開2006−192907公報(特許文献1)には、ノズルを回転させながらパリソンに突き刺すことでスムーズに開口孔を形成できることが開示されている。また、特開平9−813152公報(特許文献2)には、ピンチオフ部を屈曲形成し、ピンチオフ部によりノズルを突き刺す部位を囲むように構成することでノズルの突き刺しの際にパリソンが逃げることを防止して、確実にパリソンに開口を形成することができることが開示されている。
特開2006−192907公報 特開平9−813152公報
Conventionally, a blow molding method is known in which an air blowing hole or a discharge port is reliably opened by a nozzle. Japanese Unexamined Patent Publication No. 2006-192907 (Patent Document 1) discloses that an opening hole can be smoothly formed by piercing a parison while rotating a nozzle. Japanese Patent Application Laid-Open No. 9-813152 (Patent Document 2) prevents the parison from escaping when the nozzle is pierced by bending the pinch-off portion and surrounding the portion where the nozzle is pierced by the pinch-off portion. Thus, it is disclosed that the opening can be surely formed in the parison.
JP 2006-192907 A JP-A-9-813152

ところが、一般に吹込みノズルを突き刺した際に開口するまでにパリソンが引き伸ばされて、中空部内に突出した薄肉の突起が形成される。このため、図6に示すように、パリソンa内にエアを吹き込んだ後で、かつ分割金型b、bを型開きして中空成形体cを取り出す前に、内部のエアを排気すると薄肉の突起dが吹き込みノズルeにより形成した開口fを弁のように塞ぎ、排気不良を引き起こす原因となっていた。   However, in general, the parison is stretched until it is opened when the blowing nozzle is pierced, and a thin protrusion protruding into the hollow portion is formed. For this reason, as shown in FIG. 6, after air is blown into the parison a, and before the hollow molds c are taken out by opening the split molds b and b, the internal air is exhausted, so that the thin wall The projection d closed the opening f formed by the blowing nozzle e like a valve, causing exhaust failure.

本発明は、上記事情に鑑みてなされたものであり、排気不良の原因となる吹込み孔の引き伸ばしを好適に防止することが可能な中空成形体の製造方法及び中空成形体を提供することを目的とする。 This invention is made in view of the said situation, and provides the manufacturing method of a hollow molded object which can prevent suitably the expansion of the blowing hole which causes exhaust failure, and a hollow molded object Objective.

上記目的を達成するために、本発明は、以下の特徴を有する。In order to achieve the above object, the present invention has the following features.
本発明にかかる中空成形体の製造方法は、  The method for producing a hollow molded body according to the present invention includes:
溶融状態のパリソンを分割金型間に配置し、型閉じして前記パリソンの少なくとも一部を前記分割金型により挟持してピンチオフ部を形成した後、前記パリソン内に吹込みノズルから加圧流体を導入することにより中空成形体を形成する方法において、  A melted parison is disposed between the divided molds, the mold is closed, and at least a part of the parison is sandwiched between the divided molds to form a pinch-off portion, and then a pressurized fluid is injected from the blowing nozzle into the parison. In a method of forming a hollow molded body by introducing
前記分割金型のキャビティにより前記ピンチオフ部を介して一対の凹陥部を形成し、  Forming a pair of recesses through the pinch-off portion by the cavity of the split mold,
前記一対の凹陥部の間の前記ピンチオフ部に沿って形成された前記凹陥部の側壁と繋がる梁に、前記吹込みノズルを突き刺してパリソンに吹込み孔を形成する、ことを特徴とする。  The blow nozzle is pierced into a beam connected to the side wall of the recessed portion formed along the pinch-off portion between the pair of recessed portions, and a blowing hole is formed in the parison.

本発明にかかる中空成形体は、The hollow molded body according to the present invention is
分割金型のキャビティによりピンチオフ部を介して形成される一対の凹陥部を備え、A pair of recesses formed through the pinch-off part by the cavity of the split mold,
前記一対の凹陥部の間の前記ピンチオフ部に沿って形成された前記凹陥部の側壁と繋がる梁に吹込みノズルを突き刺して形成される吹込み孔を有する、ことを特徴とする。  It has a blowing hole formed by piercing a blowing nozzle into a beam connected to a side wall of the recessed portion formed along the pinch-off portion between the pair of recessed portions.

本発明によれば、排気不良の原因となる吹込み孔の引き伸ばしを好適に防止することができる。 According to the present invention, it is possible to suitably prevent expansion of the blow hole that causes exhaust failure.

図1は本発明の一実施の形態に係るブロー成形態様を示す要部の断面図、図2は同上ブロー成形された中空成形体の斜視図、図3は図2のA−A断面図、図4は他の実施の形態によるブロー成形された中空成形体の斜視図、図5はさらに他の実施の形態によるブロー成形された中空成形体の斜視図である。   1 is a cross-sectional view of a main part showing a blow molding aspect according to an embodiment of the present invention, FIG. 2 is a perspective view of a blow-molded hollow molded body, and FIG. 3 is a cross-sectional view taken along line AA in FIG. FIG. 4 is a perspective view of a blow molded hollow molded body according to another embodiment, and FIG. 5 is a perspective view of a blow molded hollow molded body according to still another embodiment.

図1において、1、1は分割金型、2、2はキャビティ、3はピンチオフ部であって、前記分割金型1、1のキャビティ2、2によりピンチオフ部3を介して一対の凹陥部4、4が形成される。5は吹き込みノズル、6はパリソン、7はバリ、8は中空成形体、9は中空部である。   In FIG. 1, reference numeral 1, 1 denotes a divided mold, 2, a cavity 2, and 3, a pinch-off portion. 4 are formed. 5 is a blowing nozzle, 6 is a parison, 7 is a burr, 8 is a hollow molded body, and 9 is a hollow part.

図1に示すように、溶融状態のパリソン6を分割金型1、1間に配置し、型閉じして前記パリソン6の少なくとも一部を前記分割金型1、1により挟持してピンチオフ部3を形成した後、パリソン6内に吹込みノズル5を突き刺して加圧流体を導入することにより中空成形体8をブロー形成する。   As shown in FIG. 1, the parison 6 in a molten state is disposed between the divided molds 1, 1, the mold is closed, and at least a part of the parison 6 is sandwiched between the divided molds 1, 1 to pinch off part 3 Then, the blow molded nozzle 8 is pierced into the parison 6 and a pressurized fluid is introduced to blow the hollow molded body 8.

前記のようにブロー成形される中空成形体8には、分割金型1、1のキャビティ2、2によりピンチオフ部3を介して一対の凹陥部4、4が形成されるとともに、一対の凹陥部4、4のうちの一方とピンチオフ部3の間には吹き込みノズル5を突き刺すことにより吹き込み孔10がピンチオフ部3に沿って形成される(図2、図3参照)。このため、凹陥部においてパリソンが保持されて吹き込みノズル5を突き刺す過程でパリソンが中空部側へ突出することが防止されるので、吹き込み孔10にはその中空成形体8の内部側にエア排気を妨げる薄肉の突起を生じさせることがなく、成形後に中空成形体8の排気不良を引き起こすことがない。   In the hollow molded body 8 that is blow-molded as described above, a pair of recessed portions 4, 4 are formed by the cavities 2, 2 of the split molds 1, 1 via the pinch-off portion 3, and a pair of recessed portions Between one of the pins 4 and 4 and the pinch-off portion 3, a blow-in nozzle 5 is pierced to form a blow hole 10 along the pinch-off portion 3 (see FIGS. 2 and 3). For this reason, since the parison is prevented from projecting toward the hollow portion in the process of holding the parison in the recessed portion and piercing the blow nozzle 5, air exhaust is introduced into the blow hole 10 toward the inside of the hollow molded body 8. It does not cause thin-walled projections to be hindered, and does not cause exhaust failure of the hollow molded body 8 after molding.

中空成形体8に形成する吹き込み孔10は、図4に示すように、一対の凹陥部4、4の間でかつ、ピンチオフ部3上に形成することができる。また、図示しないが吹き込みノズル5を突き刺す少なくとも一対の凹陥部4、4の間にシボなどの微細凹凸を形成してもよい。微細凹凸を形成するにはキャビティ2の対応する部位にサンドブラストなどの公知の処理を施す。これにより吹き込みノズル5を突き刺す部位の近傍に微細凹凸が形成され、キャビティ2とパリソン6の摩擦抵抗が大きくなり、パリソン6はキャビティ2に密着されて中空部側へ引き伸ばされて薄肉の突起が生じることを好適に防止することができる。   The blow hole 10 formed in the hollow molded body 8 can be formed between the pair of recessed portions 4 and 4 and on the pinch-off portion 3 as shown in FIG. Although not shown, fine irregularities such as wrinkles may be formed between at least the pair of recessed portions 4 and 4 that pierce the blowing nozzle 5. In order to form fine irregularities, a known process such as sandblasting is performed on the corresponding part of the cavity 2. As a result, fine irregularities are formed in the vicinity of the portion where the blowing nozzle 5 is pierced, the frictional resistance between the cavity 2 and the parison 6 is increased, and the parison 6 is brought into close contact with the cavity 2 and stretched toward the hollow portion to produce a thin projection. This can be suitably prevented.

図5に示す中空成形体8はダクトの例である。この中空成形体8においては、分割金型1、1を型開きし、中空成形体8を取り出した後に、中空成形体8のうち一対の凹陥部4、4および吹込み孔10を含む部分11を切除予定部12から切除することにより、中空成形体8の一部を開口させてダクトを形成する。   The hollow molded body 8 shown in FIG. 5 is an example of a duct. In this hollow molded body 8, after the divided molds 1, 1 are opened and the hollow molded body 8 is taken out, the portion 11 including the pair of recessed portions 4, 4 and the blow hole 10 in the hollow molded body 8. Is cut from the planned cutting portion 12 to open a part of the hollow molded body 8 to form a duct.

このように、本発明の方法は、ブロー成形によるダクト等の製造方法に好適であるが、パリソン6の引き伸ばしを防止するために形成される一対の凹陥部4、4は外観に影響するため、ダクト等の中空成形体8を形成した後にその一部を切除して開口させる部位に吹き込み孔を形成するものが好適である。   As described above, the method of the present invention is suitable for a method of manufacturing a duct or the like by blow molding, but the pair of recesses 4 and 4 formed to prevent the parison 6 from being stretched affects the appearance. What forms a blow hole in the site | part which cuts off the part after forming the hollow molded objects 8, such as a duct, and opens is suitable.

本発明の方法によりブロー成形される中空成形体8は、ポリエチレン、ポリプロピレン等のポリオレフィン系樹脂、ポリスチレン、ABS樹脂等のスチレン系樹脂、ポリエチレンテレフタート等のポリエステル系樹脂、ポリアミドおよびこれらの混合物などの熱可塑性樹脂で構成される。   The hollow molded body 8 blow-molded by the method of the present invention is a polyolefin resin such as polyethylene or polypropylene, a styrene resin such as polystyrene or ABS resin, a polyester resin such as polyethylene terephthalate, polyamide or a mixture thereof. It is composed of a thermoplastic resin.

さらに、本発明における中空成形体8は所謂発泡ブロー成形により形成されるものでもよい。発泡ブロー成形は窒素ガスまたは炭酸ガスなどの公知の物理発泡剤または化学発泡剤を熱可塑性樹脂と混練して押出すことにより、気泡セルからなる発泡状態とした中空成形品を得るものである。気泡セルの平均粒子径は300μm以下であることが好ましく、熱可塑性樹脂はメルトフローレートの異なる長鎖分岐構造を有するプロピレン単独重合体と直鎖構造を有するプロピレン単独重合体のブレンドを用いることが好適である。その際、ブレンドされたポリオレフィン系樹脂のうち50wt%以上より詳しくは50〜80wt%の範囲で直鎖構造のプロピレン単独重合体とするのが好ましい。   Furthermore, the hollow molded body 8 in the present invention may be formed by so-called foam blow molding. Foam blow molding is a method for obtaining a hollow molded article made of foam cells by kneading a known physical foaming agent such as nitrogen gas or carbon dioxide or a chemical foaming agent with a thermoplastic resin and extruding it. It is preferable that the average particle diameter of the cell is 300 μm or less, and the thermoplastic resin is a blend of a propylene homopolymer having a long-chain branched structure and a propylene homopolymer having a linear structure having different melt flow rates. Is preferred. At that time, it is preferable to use a propylene homopolymer having a linear structure in the range of 50 wt% or more, more specifically, 50 to 80 wt% of the blended polyolefin resin.

本発明の一実施の形態に係るブロー成形態様を示す要部の断面図である。It is sectional drawing of the principal part which shows the blow molding aspect which concerns on one embodiment of this invention. 同上ブロー成形された中空成形体の斜視図である。It is a perspective view of the hollow molded object blow-molded same as the above. 図2のA−A断面図である。It is AA sectional drawing of FIG. 本発明の他の実施の形態によるブロー成形された中空成形体の斜視図である。It is a perspective view of the blow-molded hollow molded object by other embodiment of this invention. 本発明のさらに他の実施の形態によるブロー成形された中空成形体の斜視図である。It is a perspective view of the blow molded hollow molded object by other embodiment of this invention. 従来例のブロー成形態様を示す要部の断面図である。It is sectional drawing of the principal part which shows the blow molding aspect of a prior art example.

符号の説明Explanation of symbols

1、1 分割金型
2、2 キャビティ
3 ピンチオフ部
4、4 一対の凹陥部
5 吹き込みノズル
6 パリソン
7 バリ
8 中空成形体
9 中空部
10 吹き込み孔
11 一対の凹陥部および吹込み孔を含む部分
12 切除予定部
DESCRIPTION OF SYMBOLS 1, 1 Split mold 2, 2 Cavity 3 Pinch-off part 4, 4 A pair of recessed part 5 Blowing nozzle 6 Parison 7 Burr 8 Hollow molded object 9 Hollow part 10 Blowing hole 11 A part containing a pair of recessed part and a blowing hole 12 Scheduled resection

Claims (6)

溶融状態のパリソンを分割金型間に配置し、型閉じして前記パリソンの少なくとも一部を前記分割金型により挟持してピンチオフ部を形成した後、前記パリソン内に吹込みノズルから加圧流体を導入することにより中空成形体を形成する方法において、
前記分割金型のキャビティにより前記ピンチオフ部を介して一対の凹陥部を形成し、
前記一対の凹陥部の間の前記ピンチオフ部に沿って形成された前記凹陥部の側壁と繋がる梁に、前記吹込みノズルを突き刺してパリソンに吹込み孔を形成することを特徴とする中空成形体の製造方法。
A melted parison is disposed between the divided molds, the mold is closed, and at least a part of the parison is sandwiched between the divided molds to form a pinch-off portion, and then a pressurized fluid is injected from the blowing nozzle into the parison. In a method of forming a hollow molded body by introducing
Forming a pair of recesses through the pinch-off portion by the cavity of the split mold ,
Blow molding of the beam connected to the sidewall of the recessed portion formed along the pinch-off portion between the pair of the recessed portions, forming a blow hole in the parison pierce the blowing seen nozzle, characterized in that Body manufacturing method.
前記吹込み孔は前記一対の凹陥部の間でかつ、
凹陥部の一方と前記ピンチオフ部の間に形成することを特徴とする請求項1記載の中空成形体の製造方法。
The blowing hole is between the pair of recessed portions, and
Formed between one and the pinch-off portion of the recessed portion, the production method of the hollow molded body according to claim 1, wherein a.
前記吹込み孔は前記一対の凹陥部の間でかつ、
前記ピンチオフ部上に形成することを特徴とする請求項1記載の中空成形体の製造方法。
The blowing hole is between the pair of recessed portions, and
Method for producing a hollow molded body according to claim 1, wherein the, formed on the pinch-off part.
前記吹込みノズルを突き刺す少なくとも一対の凹陥部の間にシボなどの微細凹凸を形成することを特徴とする請求項1から3の何れか1項に記載の中空成形体の製造方法。 The method for producing a hollow molded body according to any one of claims 1 to 3 , wherein fine irregularities such as a texture are formed between at least a pair of recessed portions that pierce the blowing nozzle. 前記分割金型を型開きして形成した前記中空成形体を取り出した後に、
前記中空成形体のうち前記一対の凹陥部および吹込み孔を含む部分を切除することにより、
前記中空成形体の一部を開口させることを特徴とする請求項1から4の何れか1項に記載の中空成形体の製造方法。
After taking out the hollow molded body formed by opening the split mold,
By excising the part including the pair of recesses and the blow hole in the hollow molded body,
Wherein to open a portion of the hollow molded body, method for manufacturing a hollow molded article according to claim 1, any one of 4, characterized in that.
分割金型のキャビティによりピンチオフ部を介して形成される一対の凹陥部を備え、A pair of recesses formed through the pinch-off part by the cavity of the split mold,
前記一対の凹陥部の間の前記ピンチオフ部に沿って形成された前記凹陥部の側壁と繋がる梁に吹込みノズルを突き刺して形成される吹込み孔を有する、ことを特徴とする中空成形体。  A hollow molded body having a blow hole formed by piercing a blow nozzle into a beam connected to a side wall of the concave portion formed along the pinch-off portion between the pair of concave portions.
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