JPH05293880A - Blow molding method of resin container - Google Patents
Blow molding method of resin containerInfo
- Publication number
- JPH05293880A JPH05293880A JP12800992A JP12800992A JPH05293880A JP H05293880 A JPH05293880 A JP H05293880A JP 12800992 A JP12800992 A JP 12800992A JP 12800992 A JP12800992 A JP 12800992A JP H05293880 A JPH05293880 A JP H05293880A
- Authority
- JP
- Japan
- Prior art keywords
- elastic sheet
- parison
- mold
- blow molding
- molding method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、樹脂容器のブロー成形
方法に関し、とくに均一な厚さに成形することのできる
ブロー成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding method for a resin container, and more particularly to a blow molding method capable of molding to a uniform thickness.
【０００２】[0002]
【従来の技術】従来の樹脂容器のブロー成形では、容器
全体にわたって肉厚を均一化することは難しく、たとえ
ばボトル容器では、底部の角部の厚みが減少してしま
う。このような肉厚不均一が生じる理由は次の通りであ
る。ブロー成形では、溶融樹脂パリソンは金型に接触し
つつ膨張する。いったん型に接触した部分のパリソン
は、それ以上伸張せず、自由部分が膨張を続ける。従っ
て、初期接触部は厚肉となり、コーナ部等の後期接触部
は薄肉となる（図１４参照）。2. Description of the Related Art In conventional blow molding of a resin container, it is difficult to make the wall thickness uniform over the entire container. For example, in a bottle container, the thickness of the bottom corner is reduced. The reason why such uneven thickness occurs is as follows. In blow molding, the molten resin parison expands while contacting the mold. Once the parison is in contact with the mold, the parison does not stretch anymore and the free part continues to expand. Therefore, the initial contact portion becomes thick and the late contact portion such as the corner portion becomes thin (see FIG. 14).
【０００３】このようなコーナ部の肉厚減少を軽減する
ために、従来のブロー成形では、次のような対策がとら
れていた（たとえば、「プラスチック加工技術便覧」、
株式会社日刊工業新聞社、初版発行昭和４４年１２月５
日、第３１０−３１３頁）。In order to reduce such a decrease in the wall thickness of the corner portion, the following measures have been taken in the conventional blow molding (for example, "Handbook of Plastic Processing Technology",
First edition published by Nikkan Kogyo Shimbun Co., Ltd. December 5, 1969
Sun, pp. 310-313).
【０００４】従来技術１： ボトル容器でもっとも大き
な膨張率を示す底部のラウンド部の肉厚を所定厚さに確
保するために、ネック部を含みパリソン全体の厚さを増
す。 従来技術２： 可動マンドレル付ダイスを用いてブロー
成形を行い、パリソンの肉厚を部分的に可変とすること
によって、角部の厚さを局部的に増す。Prior Art 1: In order to secure a predetermined thickness for the bottom round portion which exhibits the largest expansion coefficient in a bottle container, the thickness of the entire parison including the neck portion is increased. Prior Art 2: Blow molding is performed using a die with a movable mandrel, and the thickness of the corner is locally increased by partially varying the wall thickness of the parison.
【０００５】[0005]
【発明が解決しようとする課題】しかし、上記従来技術
１、２には次の問題がある。従来技術１には、不必要な
厚肉部が発生し、重量増加、冷却時間の延長によるサイ
クルタイムの増大、外形寸法の制限された自動車用ガソ
リンタンクにおいては内容積の減少という問題がある。However, the above-mentioned prior arts 1 and 2 have the following problems. Prior art 1 has a problem that an unnecessary thick portion is generated, an increase in weight, an increase in cycle time due to an extension of cooling time, and a decrease in internal volume in an automobile gasoline tank having a limited external dimension.
【０００６】従来技術２には、押出し機構造が複雑とな
り、設備コストが高いという問題がある。また、樹脂の
流動特性が大きく作用するため、所望の部位の肉厚を制
御するには、試行錯誤で最適条件を見つける必要があ
り、調整工数が大である。The prior art 2 has a problem that the extruder structure is complicated and the equipment cost is high. Further, since the flow characteristics of the resin have a great effect, it is necessary to find the optimum conditions by trial and error to control the wall thickness of a desired portion, and the adjustment man-hour is large.
【０００７】本発明の目的は、不必要な厚肉部を生じさ
せることなく、型の複雑化を伴なうことなく、均一な厚
さに成形できる樹脂容器のブロー成形方法を提供するこ
とにある。An object of the present invention is to provide a blow molding method for a resin container which can be molded into a uniform thickness without causing unnecessary thick portions and without complicating the mold. is there.
【０００８】[0008]
【課題を解決するための手段】上記目的は、本発明によ
れば、次の樹脂容器のブロー成形方法によって達成され
る。すなわち、弾性シートを該弾性シートの周辺部で分
割型に固定しておき、押し出された溶融樹脂パリソン内
にガスを吹き込みパリソンを伸長させてパリソンを弾性
シートに添着させ、型閉じ完了後、ガス圧を上げて本成
形を行い、パリソンの冷却、固化により成形品を得、型
を開き成形品を弾性シートから剥離させて型から取り出
す、樹脂容器のブロー成形方法。According to the present invention, the above object can be achieved by the following blow molding method for a resin container. That is, the elastic sheet is fixed to a split mold at the peripheral portion of the elastic sheet, gas is blown into the extruded molten resin parison to extend the parison, and the parison is attached to the elastic sheet. A blow molding method for a resin container, in which main molding is performed by increasing pressure, a parison is cooled and solidified to obtain a molded product, a mold is opened, the molded product is separated from an elastic sheet, and taken out from the mold.
【０００９】[0009]
【作用】上記ブロー成形方法においては、予備伸長時、
パリソンと一体化した弾性シートは、型面と弾性シート
間にすべりを伴って、その弾性特性により型面のどの部
分においても均一な伸長率をもって伸長するため、それ
に一体化されているパリソンも均一な伸長率で伸長し、
パリソン肉厚も全域にわたって均一化される。In the blow molding method described above,
The elastic sheet integrated with the parison is accompanied by a slip between the mold surface and the elastic sheet, and due to its elastic properties, it expands at a uniform elongation rate in any part of the mold surface, so the parison integrated with it is also uniform. Grows at
The parison thickness is also made uniform over the entire area.
【００１０】また、型から成形品を取り出す際、弾性シ
ートの復元力により、弾性シートと成形品とは容易に剥
離し、成形品を容易に型から取り出せ、成形品の変形、
傷付きを防止できる。Further, when the molded product is taken out from the mold, the elastic sheet and the molded product are easily separated from each other by the restoring force of the elastic sheet, and the molded product can be easily taken out from the mold to deform the molded product.
Can prevent scratches.
【００１１】[0011]
【実施例】以下に、本発明に係る樹脂容器のブロー成形
方法の望ましい実施例を図面を参照して説明する。図１
−図７は、本発明の第１実施例に係わり、ボトル容器の
ブロー成形を示している。図８−図１４は、本発明の第
２実施例に係わり、自動車用ガソリンタンクのブロー成
形を従来法の場合との比較も入れて示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a blow molding method for a resin container according to the present invention will be described below with reference to the drawings. Figure 1
FIG. 7 relates to the first embodiment of the present invention and shows blow molding of a bottle container. FIG. 8 to FIG. 14 relate to the second embodiment of the present invention and show the blow molding of a gasoline tank for automobiles in comparison with the conventional method.
【００１２】はじめに各実施例に共通な方法の構成を、
たとえば第１実施例を参照して、説明する。ただし、各
実施例において、互いに準じる部材には同一の符号を付
してある。First, the configuration of the method common to each embodiment will be described.
For example, description will be made with reference to the first embodiment. However, in each example, the same reference numerals are given to members that are similar to each other.
【００１３】第１の工程では、図１に示すように、従来
のブロー成形装置に準じる装置に、弾性を有するシート
（以下、弾性シートという）５を固定する。弾性シート
５以外の装置部分は、従来公知であり、パリソン押し出
し機１、閉開可能な分割型２、３、ガス吹き込みノズル
４から成る。弾性シート５は、各型２、３にそれぞれ設
けられ、各弾性シート５は、各型２、３に弾性シート５
の周辺部で固定される。弾性シート５の周辺部以外の部
分は型２、３から離れている。In the first step, as shown in FIG. 1, an elastic sheet (hereinafter referred to as an elastic sheet) 5 is fixed to an apparatus conforming to the conventional blow molding apparatus. The parts of the apparatus other than the elastic sheet 5 are conventionally known and include a parison extruder 1, split molds 2 and 3 which can be opened and closed, and a gas blowing nozzle 4. The elastic sheet 5 is provided on each of the molds 2 and 3, and each elastic sheet 5 is provided on each of the molds 2 and 3.
Fixed around the perimeter. The parts other than the peripheral part of the elastic sheet 5 are separated from the molds 2 and 3.
【００１４】第２の工程では、図２に示すように、押し
出し機１から押し出された筒状の溶融樹脂パリソン６の
開放下端部をピンチ板７で挟んでパリソン内を外部から
遮断し、ガス吹き込みノズル４からパリソン６内にガス
（通常はエア）を吹き込む。この時のガス圧は比較的低
圧で２ｋｇｆ／ｃｍ2 （１９６ｋＰａ）程度である。こ
れによって、パリソン６の予備伸長が行われ、膨張され
たパリソン６は、その溶融粘着性のため、弾性シート５
に粘着し、弾性シート５と一体になったパリソン６はさ
らに型キャビティ２´、３´に突入していく。この予備
伸長時に、ガスのパリソン内への吹き込みと同時に、型
２、３が閉じられていく。In the second step, as shown in FIG. 2, the open lower end of the cylindrical molten resin parison 6 extruded from the extruder 1 is sandwiched by a pinch plate 7 to shut off the inside of the parison from the outside. Gas (usually air) is blown into the parison 6 from the blowing nozzle 4. The gas pressure at this time is about 2 kgf / cm 2 (196 kPa) at a relatively low pressure. As a result, pre-expansion of the parison 6 is performed, and the expanded parison 6 has a melt adhesive property, so that the elastic sheet 5 is
The parison 6 which is adhered to and integrated with the elastic sheet 5 further penetrates into the mold cavities 2'and 3 '. At the time of this preliminary extension, the molds 2 and 3 are closed at the same time as the gas is blown into the parison.
【００１５】第３の工程では、図３に示すように、型
２、３閉じが完了した後、ガス圧を上げ、本成形を行
う。ガス圧は、たとえば３−２０ｋｇｆ／ｃｍ2 （２９
４−１９６０ｋＰａ）程度に高められる。この時、パリ
ソン６と一体化した弾性シート５は、弾性特性により張
力が全域に均一に伝わり、型２、３の表面のどの部分に
おいても均一な膨張率で伸長、膨満する。この時弾性シ
ート５と型２、３の表面はすべるが、このすべりを自在
とするために、型表面と弾性シート表面の少なくとも何
れか一方に潤滑剤を塗布したり、真空成形で用いられる
エアクッション法の様に型２、３と弾性シート５間にガ
スを供給したりしてもよい。In the third step, as shown in FIG. 3, after the molds 2 and 3 are closed, the gas pressure is increased to carry out the main molding. The gas pressure is, for example, 3-20 kgf / cm 2 (29
4-1960 kPa). At this time, in the elastic sheet 5 integrated with the parison 6, the tension is uniformly transmitted to the entire area due to the elastic property, and the elastic sheet 5 expands and expands at a uniform expansion rate in any part of the surfaces of the molds 2 and 3. At this time, the surfaces of the elastic sheet 5 and the molds 2 and 3 slip, but in order to allow this slip freely, a lubricant is applied to at least one of the mold surface and the elastic sheet surface, or the air used in vacuum forming is used. Gas may be supplied between the molds 2 and 3 and the elastic sheet 5 as in the cushion method.
【００１６】弾性シート５が均一な膨張をするために、
弾性シート５と一体とされたパリソン６も均一な膨張を
示し、その結果、パリソン６の厚みは全体にわたって均
一化する。In order for the elastic sheet 5 to expand uniformly,
The parison 6 integrated with the elastic sheet 5 also shows uniform expansion, and as a result, the thickness of the parison 6 becomes uniform throughout.
【００１７】第４の工程では、図４に示すように、パリ
ソン６の冷却、固化によって、成形品８を得る。型２、
３は温調水で１５°Ｃ程度に調温されており、型表面に
押し付けられたパリソン６は弾性シート５を介して冷却
され、固化する。In the fourth step, a molded product 8 is obtained by cooling and solidifying the parison 6 as shown in FIG. Mold 2,
3 is temperature-controlled with temperature controlled water at about 15 ° C., and the parison 6 pressed against the mold surface is cooled through the elastic sheet 5 and solidified.
【００１８】第５の工程では、図５に示すように、型
２、３を開き、成形品８を取り出す。この時、樹脂は十
分に固化しているため、かつ弾性シート５が復元力で元
の形に復元するとき弾性シート５と成形品８の表面との
間にすべりが生じるため、成形品８を弾性シート５から
容易に剥離させて型から取り出すことができる。また、
弾性シート５は元の形に復元し、その耐久性の範囲内で
繰返し使用できる。In the fifth step, the molds 2 and 3 are opened and the molded product 8 is taken out, as shown in FIG. At this time, the resin is sufficiently solidified, and slippage occurs between the elastic sheet 5 and the surface of the molded product 8 when the elastic sheet 5 is restored to its original shape by the restoring force. It can be easily peeled from the elastic sheet 5 and taken out from the mold. Also,
The elastic sheet 5 is restored to its original shape and can be used repeatedly within the range of its durability.
【００１９】弾性シート５の材質としては、パリソン温
度（樹脂が高密度ポリエチレンの場合、２００〜２３０
°Ｃ）と型温度（１５°Ｃ）の間で十分な伸長度を長期
間保持し、固化した樹脂からの剥離性の良好なものがよ
い。たとえば、樹脂が高分子量ポリエチレンの場合、架
橋型シリコンゴムがよい。The material of the elastic sheet 5 is a parison temperature (200 to 230 when the resin is high density polyethylene).
It is preferable that the resin composition retains a sufficient degree of elongation between the temperature (° C) and the mold temperature (15 ° C) for a long period of time and has good releasability from the solidified resin. For example, when the resin is high molecular weight polyethylene, crosslinked silicone rubber is preferable.
【００２０】また、弾性シート５がキャビティ２´、３
´内に膨満する時の、弾性シート５と型面とのすべりを
よくするために、弾性シート５と型面との少なくとも何
れか一方に塗布される潤滑剤としては、金属石鹸のパウ
ダ状滑剤あるいはグリス等の液状滑剤を用いることがで
きる。Further, the elastic sheet 5 has cavities 2'and 3
As a lubricant applied to at least one of the elastic sheet 5 and the mold surface in order to improve the slippage between the elastic sheet 5 and the mold surface when swelling in the inside, the powdery lubricant of metal soap is used. Alternatively, a liquid lubricant such as grease can be used.
【００２１】つぎに、各実施例に特有な事項について説
明する。第一実施例の箱形（３００×３００×２００、
底部に半径２０ｍｍのＲどり）容器のブロー成形による
肉厚均一化の効果を確認する試験を行った。パリソン樹
脂は高分子量ポリエチレン（昭和電工製ショーレックス
４５５１Ｈ）であり、箱形１８リットル容器を成形し
た。使用した弾性シートは、架橋型シリコンゴム（富士
高分子製３ＦＬ）で厚さ１ｍｍであった。図６に示すよ
うに、容器の中心部を側面から底面にかけて１ｃｍピッ
チで順に、、・・・とし、各部の厚さを測定した。Next, items peculiar to each embodiment will be described. Box shape of the first embodiment (300 × 300 × 200,
A test was conducted to confirm the effect of uniforming the wall thickness by blow molding of a container having a radius of 20 mm at the bottom. The parison resin was high molecular weight polyethylene (Showlex 4551H manufactured by Showa Denko), and a box-shaped 18 liter container was molded. The elastic sheet used was a crosslinked silicone rubber (3FL manufactured by Fuji Polymer Co., Ltd.) and had a thickness of 1 mm. As shown in FIG. 6, the thickness of each part was measured by sequentially setting the center part of the container from the side surface to the bottom surface at a pitch of 1 cm.
【００２２】測定結果は図１５に示す通りである。測定
結果を整理すると、標準偏差の点では、弾性シートなし
の場合が０．４５、弾性シート有りの場合が０．２２、
肉厚の最大／最小比の点では、弾性シートなしの場合が
２．５、弾性シート有りの場合が１．５であることがわ
かった。上に示すように、弾性シートなしの場合（従来
法）に比べて、弾性シートありの場合（本発明）は、大
幅な肉厚の均一化が得られる。The measurement results are as shown in FIG. When the measurement results are sorted out, in terms of standard deviation, 0.45 without the elastic sheet, 0.22 with the elastic sheet,
Regarding the maximum / minimum ratio of the wall thickness, it was found that the case without the elastic sheet was 2.5, and the case with the elastic sheet was 1.5. As shown above, compared to the case without the elastic sheet (conventional method), the case with the elastic sheet (the present invention) achieves a significant uniformization of the wall thickness.
【００２３】また、容器形状を種々に変えて試験した結
果、下記条件に合致する形状を有する成形品において、
良好な肉厚均一化が得られることが判明した。すなわ
ち、型の半分を示した図７において、パリソン６の上下
端は型に挟まれて拘束される。この拘束点を９、１０で
示す。拘束点９と型コーナ部１１を結ぶ型面が水平面と
なす仰角θ1 が０°−４５°で、かつ、コーナ部１１を
挟む型の２面のなす角度θ2 が１８０°未満である場合
に、良好な肉厚均一化が得られた。Further, as a result of testing variously changing the container shape, in a molded product having a shape that meets the following conditions,
It was found that good thickness uniformity can be obtained. That is, in FIG. 7 showing a half of the mold, the upper and lower ends of the parison 6 are sandwiched and constrained by the mold. This constraint point is shown by 9 and 10. When the elevation angle θ 1 formed by the mold surface connecting the constraint point 9 and the mold corner portion 11 with the horizontal plane is 0 ° -45 °, and the angle θ 2 formed by the two surfaces of the mold sandwiching the corner portion 11 is less than 180 ° In addition, good thickness uniformity was obtained.
【００２４】第２実施例では、自動車用ガソリンタンク
が、車両搭載状態では上下方向となる方向を水平方向に
して、ブロー成形が実施される。ここで、図８が弾性シ
ート５の張設の第１工程に対応し、図９がパリソン６の
予備伸長を行う第２工程に対応し、図１０が本成形を行
う第３工程に対応し、図１１がパリソンの冷却、固化が
行われる第４工程に対応し、図１２が成形品の取り出し
を行う第５工程に対応する。In the second embodiment, the blow molding is carried out with the gasoline tank for automobiles being horizontal when the vehicle is mounted in the vertical direction. Here, FIG. 8 corresponds to the first step of stretching the elastic sheet 5, FIG. 9 corresponds to the second step of pre-expanding the parison 6, and FIG. 10 corresponds to the third step of main forming. 11 corresponds to the fourth step in which the parison is cooled and solidified, and FIG. 12 corresponds to the fifth step in which the molded product is taken out.
【００２５】第２工程では、図２と同様にピンチ板でパ
リソン下端を挟んで予備伸長した後（図示せず）、図９
に示すように、型閉めして引き続きガス圧を上げて本成
形が行われる。In the second step, the lower end of the parison is sandwiched between pinch plates and pre-stretched (not shown) as in FIG.
As shown in, the mold is closed and the gas pressure is subsequently increased to perform the main molding.
【００２６】図１０の本成形において、コーナ部（図１
０で円Ａで囲んだ部分）の肉厚均一化が、弾性シート５
がある場合（本発明）とない場合（従来）とで、どのよ
うな差異が生じるかを、図１３（弾性シートありの場
合）と図１４（弾性シートなしの場合）に示してある。In the main forming of FIG. 10, the corner portion (see FIG.
The thickness of the portion surrounded by the circle A (0) is equalized by the elastic sheet 5
FIG. 13 (in the case where the elastic sheet is provided) and FIG. 14 (in the case where the elastic sheet is not provided) are shown in FIG.
【００２７】弾性シートがない場合には、図１４に示す
ように、型に粘着したパリソン６´は、そこで膨張する
ことなく固化するため、コーナの奥へ肉を寄せることが
できず、コーナの奥にいくに従って肉厚が薄くなる。When the elastic sheet is not provided, as shown in FIG. 14, the parison 6'adhered to the mold is solidified without expanding there, so that the meat cannot be pushed to the inside of the corner and the corner of the corner cannot be pulled. The wall thickness decreases as you go further.
【００２８】これに対し、本発明では、図１３に示すよ
うに、弾性シート５と型面との間はすべることができる
ため、弾性シート５はその弾性によって全体にわたって
均一な張力がかかり、均一な膨張率で伸長する。溶融し
たパリソン６も、弾性シート５と一体化されているた
め、均等に引き伸ばされるため、パリソン肉厚が均一化
する。On the other hand, according to the present invention, as shown in FIG. 13, since the elastic sheet 5 and the mold surface can slide, the elastic sheet 5 is uniformly tensioned by its elasticity, so that the elastic sheet 5 has a uniform tension. It expands at a high expansion rate. Since the melted parison 6 is also integrated with the elastic sheet 5, the parison 6 is evenly stretched, so that the parison thickness becomes uniform.
【００２９】[0029]
【発明の効果】本発明によれば次の効果を得る。 （イ） 型に弾性シートを張設して、溶融樹脂パリソン
にガスを吹き込みパリソンを予備伸長させて弾性シート
に添着させ、ガス圧を上げて本成形を行うようにしたの
で、弾性シートが均一な伸長率で伸長するとき、弾性シ
ートに一体化したパリソンも均一な伸長率で伸長、膨満
し、肉厚を均一化できる。According to the present invention, the following effects are obtained. (A) An elastic sheet is stretched on the mold, gas is blown into the molten resin parison to pre-expand the parison, and the parison is attached to the elastic sheet, and the gas pressure is increased to perform the main molding, so that the elastic sheet is uniform. When stretched at a constant stretch rate, the parison integrated with the elastic sheet also stretches and expands at a uniform stretch rate, and the wall thickness can be made uniform.
【００３０】（ロ） この肉厚均一な成形により、成形
品に不必要な厚肉部を生じさせることがなくなり、しか
も、型の複雑化を伴なうことなく肉厚均一化を達成でき
る。(B) By forming with this uniform wall thickness, unnecessary thick wall portions are not created in the molded product, and moreover, uniform wall thickness can be achieved without complicating the mold.
【００３１】（ハ） 型から成形品を取り出す際、弾性
シートの復元力により成形品が弾性シートから容易に剥
離し、成形品を型から取り出す際に成形品の変形、傷つ
きを防止できる。(C) When the molded product is taken out of the mold, the molded product is easily separated from the elastic sheet due to the restoring force of the elastic sheet, and deformation and damage of the molded product can be prevented when the molded product is taken out of the mold.
【図１】本発明の第１実施例に係る樹脂容器のブロー成
形方法の第１工程を示す断面図である。FIG. 1 is a sectional view showing a first step of a blow molding method for a resin container according to a first embodiment of the present invention.
【図２】本発明の第１実施例に係る樹脂容器のブロー成
形方法の第２工程を示す断面図である。FIG. 2 is a cross-sectional view showing a second step of the blow molding method for a resin container according to the first embodiment of the present invention.
【図３】本発明の第１実施例に係る樹脂容器のブロー成
形方法の第３工程を示す断面図である。FIG. 3 is a cross-sectional view showing a third step of the blow molding method for a resin container according to the first embodiment of the present invention.
【図４】本発明の第１実施例に係る樹脂容器のブロー成
形方法の第４工程を示す断面図である。FIG. 4 is a sectional view showing a fourth step of the blow molding method for a resin container according to the first embodiment of the present invention.
【図５】本発明の第１実施例に係る樹脂容器のブロー成
形方法の第５工程を示す断面図である。FIG. 5 is a cross-sectional view showing a fifth step of the blow molding method for a resin container according to the first embodiment of the present invention.
【図６】本発明の第１実施例に係る樹脂容器のブロー成
形方法の肉厚均一化確認試験における容器の肉厚測定部
位を示す断面図である。FIG. 6 is a cross-sectional view showing the wall thickness measurement portion of the container in the wall thickness uniformity confirmation test of the blow molding method for the resin container according to the first embodiment of the present invention.
【図７】本発明の第１実施例における良好な結果を得る
ための条件を示す容器形状図である。FIG. 7 is a container shape diagram showing conditions for obtaining good results in the first embodiment of the present invention.
【図８】本発明の第２実施例に係る樹脂容器のブロー成
形方法の第１工程を示す断面図である。FIG. 8 is a sectional view showing a first step of a blow molding method for a resin container according to a second embodiment of the present invention.
【図９】本発明の第２実施例に係る樹脂容器のブロー成
形方法の第３工程のうち（パリンの伸長段階）を示す断
面図である。FIG. 9 is a cross-sectional view showing (Parin extension step) in the third step of the resin container blow molding method according to the second embodiment of the present invention.
【図１０】本発明の第２実施例に係る樹脂容器のブロー
成形方法の第３工程のうちパリソンの膨満完了時を示す
断面図である。FIG. 10 is a cross-sectional view showing the completion of the expansion of the parison in the third step of the blow molding method for the resin container according to the second embodiment of the present invention.
【図１１】本発明の第２実施例に係る樹脂容器のブロー
成形方法の第４工程を示す断面図である。FIG. 11 is a cross-sectional view showing a fourth step of the blow molding method for a resin container according to the second embodiment of the present invention.
【図１２】本発明の第２実施例に係る樹脂容器のブロー
成形方法の第５工程を示す断面図である。FIG. 12 is a sectional view showing a fifth step of the blow molding method for a resin container according to the second embodiment of the present invention.
【図１３】図１０のＡ部分の拡大断面図である。13 is an enlarged cross-sectional view of a portion A of FIG.
【図１４】弾性シートなしの場合の図１３に対応する部
分の断面図である。FIG. 14 is a sectional view of a portion corresponding to FIG. 13 in the case where an elastic sheet is not used.
【図１５】図６の容器の試験結果を示す、弾性シート有
りの場合と弾性シートなしの場合の容器肉厚分布図であ
る。15 is a container thickness distribution chart showing the test results of the container of FIG. 6 with and without an elastic sheet.
１ パリソン押し出し機 ２ 型 ３ 型 ４ ガス吹き込みノズル ５ 弾性シート ６ パリソン ７ ピンチ板 ８ 成形品 1 parison extruder 2 type 3 type 4 gas blowing nozzle 5 elastic sheet 6 parison 7 pinch plate 8 molded product
フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ２９Ｌ 22:00 4Ｆ Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display area // B29L 22:00 4F
Claims (1)
辺部で分割型に固定しておき、 押し出された溶融樹脂パリソン内にガスを吹き込みパリ
ソンを伸長させてパリソンを前記弾性シートに添着さ
せ、 型閉じ完了後、ガス圧を上げて本成形を行い、 パリソンの冷却、固化により成形品を得、 型を開き成形品を前記弾性シートから剥離させて型から
取り出す、ことを特徴とする樹脂容器のブロー成形方
法。1. An elastic sheet is fixed in a split mold at a peripheral portion of the elastic sheet, gas is blown into the extruded molten resin parison to extend the parison, and the parison is attached to the elastic sheet. After completion of mold closing, the gas pressure is increased to perform main molding, a molded product is obtained by cooling and solidifying the parison, the mold is opened, the molded product is separated from the elastic sheet, and taken out from the mold. Blow molding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12800992A JP3026333B2 (en) | 1992-04-22 | 1992-04-22 | Blow molding method for resin container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12800992A JP3026333B2 (en) | 1992-04-22 | 1992-04-22 | Blow molding method for resin container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05293880A true JPH05293880A (en) | 1993-11-09 |
| JP3026333B2 JP3026333B2 (en) | 2000-03-27 |
Family
ID=14974221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12800992A Expired - Lifetime JP3026333B2 (en) | 1992-04-22 | 1992-04-22 | Blow molding method for resin container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3026333B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100296379B1 (en) * | 1999-04-29 | 2001-07-03 | 윤성태 | Method for preventing side cubical expansion phenomenon in the production of square plastic container for improving productivity |
-
1992
- 1992-04-22 JP JP12800992A patent/JP3026333B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100296379B1 (en) * | 1999-04-29 | 2001-07-03 | 윤성태 | Method for preventing side cubical expansion phenomenon in the production of square plastic container for improving productivity |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3026333B2 (en) | 2000-03-27 |
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