JPH0356167B2 - - Google Patents

Info

Publication number
JPH0356167B2
JPH0356167B2 JP58056330A JP5633083A JPH0356167B2 JP H0356167 B2 JPH0356167 B2 JP H0356167B2 JP 58056330 A JP58056330 A JP 58056330A JP 5633083 A JP5633083 A JP 5633083A JP H0356167 B2 JPH0356167 B2 JP H0356167B2
Authority
JP
Japan
Prior art keywords
parison
temperature
mold
temperature control
polypropylene
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.)
Expired
Application number
JP58056330A
Other languages
Japanese (ja)
Other versions
JPS59179318A (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP58056330A priority Critical patent/JPS59179318A/en
Priority to AU26197/84A priority patent/AU569067B2/en
Priority to FR8404897A priority patent/FR2543483B1/en
Priority to GB08408076A priority patent/GB2139551B/en
Priority to ES531193A priority patent/ES531193A0/en
Priority to IT67316/84A priority patent/IT1180016B/en
Priority to DE19843411905 priority patent/DE3411905A1/en
Publication of JPS59179318A publication Critical patent/JPS59179318A/en
Publication of JPH0356167B2 publication Critical patent/JPH0356167B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/18—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6472—Heating or cooling preforms, parisons or blown articles in several stages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3032—Preforms or parisons made of several components having components being injected
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/02—Thermal shrinking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 この発明はパリソンの射出成形から２軸配向さ
れたびんなどの中空品の成形を連続的に行うポリ
プロピレンの２軸延伸吹込成形方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for biaxial stretch blow molding of polypropylene, in which injection molding of a parison and molding of a biaxially oriented hollow article such as a bottle are carried out continuously.

ポリプロピレンは結晶性の樹脂で、成形に用い
られるペレツトは白く、結晶の状態にある。この
ポリプロピレンの成形可能な温度は、190°〜260
℃の範囲で、ブロー成形やインジエクシヨンブロ
ー成形などで、びんなどの中空品を成形する場合
には、可能な限り高温側に設定されることが望ま
しいとされている。 Polypropylene is a crystalline resin, and the pellets used for molding are white and in a crystalline state. The moldable temperature of this polypropylene is 190°~260°
When molding a hollow product such as a bottle by blow molding or injection blow molding, it is said that it is desirable to set the temperature as high as possible within the temperature range of °C.

ブロー成形またはインジエクシヨンブローで
は、成形されたパリソンを、直ちに中空品にブロ
ー成形していることから、そこに生ずる中空品の
すべては透明性の悪いものであり、白濁化してい
る。 In blow molding or injection blowing, the molded parison is immediately blow molded into hollow products, so all of the resulting hollow products have poor transparency and are cloudy.

この不透明なポリプロピレンの中空品を透明化
するには、ポリエチレンテレフタレートの透明な
中空品を得るために、一般に実施されている２軸
延伸吹込成形を採用することである。 To make this opaque polypropylene hollow article transparent, biaxial stretch blow molding, which is commonly practiced to obtain transparent polyethylene terephthalate hollow articles, is employed.

しかしながら、パリソンの射出成形から中空品
の延伸吹込成形を連続的に行う２軸延伸吹込成
形、即ち一般にホツトパリソン方式と称されてい
る手段に従つて、ポリプロピレンの中空品の成形
を行うと、パリソン温度を成形に最も適した温度
に調整した場合であつても、延伸吹込成形中にパ
リソンが破損し易く、また中空品が得られても、
その中空品の肉厚は不均一で透明性にもむらがあ
り、満足すべき中空品を得ることができなかつ
た。 However, when polypropylene hollow articles are molded by biaxial stretch blow molding, in which the process of parison injection molding and hollow article stretch blow molding are carried out continuously, that is, the method generally referred to as the hot parison method, the parison temperature Even when the temperature is adjusted to the most suitable temperature for molding, the parison is easily damaged during stretch blow molding, and even if a hollow product is obtained,
The wall thickness of the hollow article was uneven and the transparency was also uneven, making it impossible to obtain a satisfactory hollow article.

上記中空品の不透明性は、溶融状態から冷却過
程において生ずる結晶によるものとされ、また未
晶質の内の結晶質の寸法及び程度によつて透明性
に差が生ずるとされている。したがつて、パリソ
ンの射出成形から中空品の延伸吹込成形に至る工
程をきわめて短時間にて行えば、透明性に優れ、
また肉厚が均一な中空品を得ることができるかも
しれないが、現在使用されている装置では、その
ようなことは不可能であり、今だ２軸配向による
透明で光沢を有し、肉厚が均一なポリプロピレン
の中空品は得られていない。 The opacity of the hollow article is said to be due to crystals generated during the cooling process from the molten state, and it is said that the transparency varies depending on the size and degree of crystallinity within the amorphous state. Therefore, if the process from injection molding of parisons to stretch blow molding of hollow products can be carried out in a very short time, it will be possible to produce products with excellent transparency.
It may also be possible to obtain hollow products with uniform wall thickness, but this is not possible with the equipment currently in use, and it is still possible to obtain hollow products with a transparent, glossy, and fleshy surface due to biaxial orientation. Polypropylene hollow articles with uniform thickness have not been obtained.

この発明の目的は、透明で光沢があり、しかも
全体的に肉厚が均一の美麗なポリプロピレンによ
るびんなどの中空品を、２軸延伸吹込により成形
せんとすることにある。 An object of the present invention is to mold a beautiful hollow product such as a bottle made of polypropylene which is transparent, glossy, and has a uniform wall thickness throughout, by biaxial stretching blowing.

またこの発明の他の目的は、ポリエチレンテレ
フタレートなどの射出延伸吹込成形に使用されて
いる装置をもつて、容易に成形することのできる
ポリプロピレンの２軸延伸吹込成形を提供するこ
とにある。 Another object of the present invention is to provide biaxial stretch blow molding of polypropylene which can be easily molded using equipment used for injection stretch blow molding of polyethylene terephthalate and the like.

上記目的によるこの発明は、射出シリンダ内の
溶融したポリプロピレンを、金型に注入する前に
充分に混練し、溶融状態にある材料中の結晶質を
完全に除去することを１つの特徴とする。 One feature of the present invention for the above-mentioned purpose is that the molten polypropylene in the injection cylinder is sufficiently kneaded before being injected into the mold to completely remove the crystalline material in the molten material.

一般的にパリソンの成形はペレツトを加熱され
た射出シリンダ内にて、射出スクリユの回転によ
り溶融し、射出スクリユの先端に計量された溶融
材料を、射出スクリユの前進移動をもつて金型に
注入することによる。通常の射出成形では、射出
スクリユの回転によつてペレツトが完全に溶融す
るように設計され、計量完了時に完全に溶融して
いるものとされており、溶融状態までは詳しく管
理されていない。 Generally, parison molding involves melting pellets in a heated injection cylinder by rotating an injection screw, and then injecting the molten material measured at the tip of the injection screw into a mold by moving the injection screw forward. By doing. Normal injection molding is designed so that the pellets are completely melted by the rotation of the injection screw, and it is assumed that the pellets are completely melted by the time measurement is completed, and the melting state is not controlled in detail.

ポリプロピレンのような結晶性の樹脂では、溶
融の程度によつて未晶質と結晶質とが存在し、射
出スクリユによる溶融によつて、パリソンの射出
成形が可能であつても、結晶質が存在する場合が
あり得るのである。そして溶融状態のポリプロピ
レンが、非晶質と結晶質とからなる限り、透明で
光沢のある２軸配向の中空品を、パリソンの延伸
吹込をもつて得ることができないことを見出した
のである。 Crystalline resins such as polypropylene can be either amorphous or crystalline depending on the degree of melting, and even if a parison can be injection molded by melting with an injection screw, crystalline resins may exist There may be cases where this is the case. They discovered that as long as the polypropylene in the molten state is composed of amorphous and crystalline materials, it is not possible to obtain a transparent, shiny, biaxially oriented hollow article by stretch blowing a parison.

また射出スクリユの先端に計量された材料に
は、すべてが溶融状態あつても、温度むらがある
ものと思われる。そしてその温度むらは溶融材料
を金型に注入した際にも受け継がれ、パリソンに
おける温度むらの１つの原因となる。パリソン温
度の不均一性は、延伸吹込成形前に実施されてい
る温調によつて均一に修正可能であるが、それは
冷却された金型により生じた外的な温度むらであ
つて、パリソン成形前に生じている内的な温度む
らまでをも、短時間の温調によつて均一化するこ
とは困難である。そしてその温度むらが延伸吹込
成形時のパリソンの冷却速度に差を生じさせ、伸
長し易い部分とし難い部分が生ずる結果、破損が
発生するのであり、また透明性にむらが生ずるの
である。 Furthermore, even if all of the material measured at the tip of the injection screw is molten, there is likely to be unevenness in temperature. This temperature unevenness is inherited even when the molten material is injected into the mold, and is one of the causes of temperature unevenness in the parison. Non-uniformity in parison temperature can be corrected uniformly by temperature control performed before stretch blow molding, but this is due to external temperature unevenness caused by the cooled mold. It is difficult to even out the internal temperature unevenness that has previously occurred through short-term temperature control. This temperature unevenness causes a difference in the cooling rate of the parison during stretch-blow molding, creating parts that are easy to stretch and others that are difficult to stretch, resulting in breakage and uneven transparency.

この発明における上記混練は、計量後におい
て、溶融状態のポリプロピレンの非晶質と結晶質
とを、射出スクリユの回転をもつて混ぜ合わせる
ことをいうのであり、これにより結晶質を除くと
同時に、温度の均一化をも図り、パリソンにおけ
る内的な温度の不均一性を除去するものである。
事実、混練を行つたのちに成形したパリソンと、
通常に成形したパリソンの温度とを測定した結果
では、前者の方が温度むらが少く、また透明性も
前者の方が良く、後者は前者よりも著しく白濁化
している。 The above-mentioned kneading in this invention refers to mixing the amorphous and crystalline polypropylene in the molten state with the rotation of the injection screw after weighing, thereby removing the crystalline and at the same time This also aims to make the temperature uniform and eliminate internal temperature non-uniformity in the parison.
In fact, the parison formed after kneading,
The results of measuring the temperature of a conventionally molded parison show that the former has less temperature unevenness and better transparency, while the latter is significantly more cloudy than the former.

この発明において、パリソンの成形に当つて
は、射出、冷却時間は出来る丈短くして、パリソ
ン内・外表面に薄皮を形成させ、金型よりパリソ
ンが離型出来る限界に冷却をとどめる。 In this invention, when molding the parison, the injection and cooling times are kept as short as possible to form a thin skin on the inner and outer surfaces of the parison, and the cooling is kept to a limit that allows the parison to be released from the mold.

金型より取り出された直後のパリソンは、その
内・外表面の薄皮が結晶化して、わずかに白濁し
ているが、パリソン内部には未結晶の高温部分が
残つており、その保有熱量により、内・外表面の
薄皮が溶け、しばらくするとパリソンはしだいに
透明度を増し、すき通つてくる。 Immediately after being taken out of the mold, the parison has crystallized thin skins on its inner and outer surfaces, making it slightly cloudy, but there are still uncrystallized high-temperature parts inside the parison, and the amount of heat it retains The thin skin on the inner and outer surfaces melts, and after a while the parison gradually becomes more transparent and passes through.

金型から離型したホツトパリソンは、直ちに熱
交換式の温調装置により成形温度に調整する。こ
の温調は本発明者が先に発明した温調方法（特願
昭57−130862号、特願昭57−166377号）に開示し
た手段を用いて行う。この温調により、パリソン
に残つている僅かな温度むらも短時間で均一化さ
れる。また温調に用いる温調型の寸法は、パリソ
ンの寸法に対して、面積比にて約1.4〜２倍程度
にし、且つ、温調終了後、パリソンは再び原形に
復元しようとして、収縮する温度範囲にてコント
ロールする。 The hot parison released from the mold is immediately adjusted to the molding temperature using a heat exchange type temperature control device. This temperature control is carried out using the means disclosed in the temperature control method previously invented by the present inventor (Japanese Patent Application No. 130862/1982, Japanese Patent Application No. 166377/1987). Due to this temperature control, even slight temperature irregularities remaining in the parison can be uniformized in a short time. In addition, the dimensions of the temperature control mold used for temperature control should be approximately 1.4 to 2 times the area ratio of the parison. Control within range.

温調ブローされたパリソンは、非晶質状態にあ
り、透明にすき通つている。 The temperature-controlled parison is in an amorphous state and transparent.

この状態にて急速に延伸ブローし、急冷してや
ることにより透明性に優れた２軸配向の中空品が
延伸吹込成形される。 In this state, the product is rapidly stretch-blown and rapidly cooled to produce a biaxially oriented hollow product with excellent transparency.

次に実施例について詳細に説明する。なお成形
は特公昭53−22096号に開示された装置を用いて
行つた。 Next, examples will be described in detail. The molding was carried out using the apparatus disclosed in Japanese Patent Publication No. 53-22096.

実施例 １ 220℃に加熱された射出シリンダ内にて、射出
スクリユの回転によりポリプロピレンペレツト
（三菱化成6200E）を加熱、溶融して計量を行い、
計量後に更に射出スクリユを回転して、混練を短
時間行つた。混練後に12゜〜15℃に冷却した金型
に溶融材料を注入して、下記寸法の有底のホツト
パリソンを成形した。Example 1 In an injection cylinder heated to 220°C, polypropylene pellets (Mitsubishi Kasei 6200E) were heated and melted by rotating the injection screw, and then weighed.
After weighing, the injection screw was further rotated to perform kneading for a short time. After kneading, the molten material was poured into a mold that had been cooled to 12° to 15°C to form a bottomed hot parison having the following dimensions.

外径 22mm 内径 15mm 肉厚 3.5mm 全長 128mm 首下長さ 110mm 上記ホツトパリソンを、離型可能な状態で、出
来るだけ高温のうちに金型より取出し、特願昭57
−151175号に開示された温調型を有する熱交換式
の温調装置に移送して、直ちに温調を行つた。こ
の場合のホツトパリソンの温度は100゜〜103℃で
あり、下記条件により温調が行われた。 Outer diameter 22mm Inner diameter 15mm Wall thickness 3.5mm Overall length 128mm Length under neck 110mm The above hot parison was taken out of the mold while still removable and as hot as possible.
It was transferred to a heat exchange type temperature control device having a temperature control type disclosed in No. 151175, and the temperature was immediately controlled. The temperature of the hot parison in this case was 100° to 103°C, and the temperature was controlled under the following conditions.

温調型内型 36mm 同 深さ 137mm 同 温度 120〜130℃ 温調時間 ６〜7sec 空気圧 １〜２Kg/cm2 温調は、温調型内にて、まずホツトパリソンに
伸長ロツドを挿入して、ホツトパリソンを温調型
内底面まで軸方向に伸長してのち、ホツトパリソ
ン内に空気を６〜７秒間吹込んで膨脹させ、ホツ
トパリソンの外表面を、温調型の内表面に密着し
て行つた。温調の完了は、パリソンを加圧してい
る伸長ロツドと空気圧とを除去した際に生ずるパ
リソンの収縮をもつて行う。このため温調型から
引き出した温調パリソンの寸法は、外径31〜32
mm、首下長さ130mmとなり、温調前よりも大きく
なつている。またパリソン温度も113゜〜120℃と
高くなつている。 Temperature control mold inner mold 36mm Same depth 137mm Same Temperature 120~130℃ Temperature control time 6~7sec Air pressure 1~2Kg/cm 2 To control the temperature, first insert the extension rod into the hot parison inside the temperature control mold. After the hot parison was extended in the axial direction to the inner bottom surface of the temperature control mold, air was blown into the hot parison for 6 to 7 seconds to expand it, and the outer surface of the hot parison was brought into close contact with the inner surface of the temperature control mold. Temperature control is completed when the parison contracts when the extension rod and air pressure pressurizing the parison are removed. For this reason, the dimensions of the temperature control parison pulled out from the temperature control mold are 31 to 32 mm in outer diameter.
mm, and the length under the neck is 130 mm, which is larger than before the temperature control. Also, the parison temperature is as high as 113° to 120°C.

温調完了後のパリソンは、直ちに吹込金型の位
置に移送し、通常の手段によつて下記寸法の600
mlバイエルボトルに延伸吹込成形された。なおこ
のときの吹込圧力は８〜10Kg/cm2、時間３〜
5.5secであつた。 Immediately after the temperature control is completed, the parison is transferred to the blow mold location and molded into a 600mm
Stretch blow molded into a ml Bayer bottle. In addition, the blowing pressure at this time is 8 to 10 Kg/cm 2 and the time is 3 to
It was 5.5 seconds.

ボトル外径（楕円形） 80×60mm 肉厚 0.4mm 全長 198mm 首下長さ 180mm 重量 22.2ｇ 上記成形品は透明で白濁が見られず、また光沢
があり、肉厚も均一であつた。 Bottle outer diameter (elliptical) 80 x 60 mm Wall thickness 0.4 mm Total length 198 mm Length under neck 180 mm Weight 22.2 g The molded product was transparent with no clouding, was glossy, and had a uniform wall thickness.

実施例 ２ この実施例は700mlのオイルボトルを実施例１
の場合と同様な工程によつて成形した場合であ
る。したがつて、下記に成形条件のみを記載す
る。Example 2 This example uses a 700ml oil bottle as Example 1.
This is a case of molding using the same process as in the case of . Therefore, only the molding conditions will be described below.

パリソン寸法 外径 28mm 内径 20.6mm 肉厚 3.7mm 全長 130mm 首下長さ 118mm 金型温度 15〜22℃ パリソン温度 100℃ 温調型 内径 40mm 深さ 122mm 温度 90゜〜100℃ 空気圧 ８Kg/cm2 温調時間 0.5〜1sec 温調パリソン 外径 33mm 首下長さ 119mm 温度 115℃ オイルボトル（成形品） 外 径 φ70mm（Maxφ77mm） 全 長 225mm 肉 厚 0.4mm 首下長さ 213mm 重 量 29.6ｇ 上記成形品もまた透明性に優れ、光沢があり、
肉厚分布も均一であつた。 Parison dimensions Outer diameter 28mm Inner diameter 20.6mm Wall thickness 3.7mm Total length 130mm Length under neck 118mm Mold temperature 15~22℃ Parison temperature 100℃ Temperature control type Inner diameter 40mm Depth 122mm Temperature 90°~100℃ Air pressure 8Kg/cm 2 temperature Adjustment time 0.5~1sec Temperature control parison Outer diameter 33mm Length under neck 119mm Temperature 115℃ Oil bottle (molded product) Outer diameter φ70mm (Maxφ77mm) Total length 225mm Wall thickness 0.4mm Length under neck 213mm Weight 29.6g Above molded product It also has excellent transparency and shine,
The wall thickness distribution was also uniform.

Claims (1)

【特許請求の範囲】[Claims] １ 射出シリンダ内の溶融したポリプロピレン
を、金型に注入する前に充分に混練し、溶融ポリ
プロピレン中の結晶質を完全に除去した状態にて
パリソンの成形を行い、そのパリソンを出来るだ
け高温のうちに離型して、熱交換式温調装置によ
り温調し、その温調パリソンを直ちに吹込金型内
にて延伸吹込成形して、２軸延伸された所望の透
明な中空品を得ることを特徴とするポリプロピレ
ンの２軸延伸吹込成形方法。1 The molten polypropylene in the injection cylinder is thoroughly kneaded before being injected into the mold, and the crystalline material in the molten polypropylene is completely removed before molding into a parison, and the parison is heated at as high a temperature as possible. The mold is released, the temperature is controlled using a heat exchange type temperature control device, and the temperature control parison is immediately stretch blow molded in a blow mold to obtain the desired biaxially stretched transparent hollow product. Characteristic biaxial stretch blow molding method for polypropylene.
JP58056330A 1983-03-31 1983-03-31 Biaxial orientation blow molding method of polypropylene Granted JPS59179318A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP58056330A JPS59179318A (en) 1983-03-31 1983-03-31 Biaxial orientation blow molding method of polypropylene
AU26197/84A AU569067B2 (en) 1983-03-31 1984-03-28 Preform preparation
FR8404897A FR2543483B1 (en) 1983-03-31 1984-03-29 BLOW MOLDING PROCESS WITH BIAXIAL STRETCHING OF POLYPROPYLENE
GB08408076A GB2139551B (en) 1983-03-31 1984-03-29 Method of making a hollow article of polypropylene by biaxial stretch blow moulding
ES531193A ES531193A0 (en) 1983-03-31 1984-03-30 A METHOD TO MOLD BY BLOWING
IT67316/84A IT1180016B (en) 1983-03-31 1984-03-30 BLOWING MOLDING PROCESS WITH BI-AXIAL STRETCHING OF POLYPROPYLENE
DE19843411905 DE3411905A1 (en) 1983-03-31 1984-03-30 METHOD FOR PRODUCING HOLLOW BODIES FROM BIAXIAL RETURNED POLYPROPYLENE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58056330A JPS59179318A (en) 1983-03-31 1983-03-31 Biaxial orientation blow molding method of polypropylene

Publications (2)

Publication Number Publication Date
JPS59179318A JPS59179318A (en) 1984-10-11
JPH0356167B2 true JPH0356167B2 (en) 1991-08-27

Family

ID=13024175

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58056330A Granted JPS59179318A (en) 1983-03-31 1983-03-31 Biaxial orientation blow molding method of polypropylene

Country Status (7)

Country Link
JP (1) JPS59179318A (en)
AU (1) AU569067B2 (en)
DE (1) DE3411905A1 (en)
ES (1) ES531193A0 (en)
FR (1) FR2543483B1 (en)
GB (1) GB2139551B (en)
IT (1) IT1180016B (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2550990B1 (en) * 1983-08-22 1987-01-30 Colgate Palmolive Co METHOD FOR MANUFACTURING A HOLLOW BODY BY EXTRUSION AND BLOWING OF PLASTIC MATERIAL AND INSTALLATION FOR CARRYING OUT SAID METHOD
JPS60125626A (en) * 1983-12-13 1985-07-04 Mitsui Toatsu Chem Inc Blow-molded container made of polypropylene
EP0309138A3 (en) * 1987-09-21 1991-08-07 Exxon Chemical Patents Inc. Random copolymer polypropylene container and method for producing the same
AU640997B2 (en) * 1990-03-30 1993-09-09 A. K. Technical Laboratory, Inc. Injection orientation blow molding method
DE4105403C3 (en) * 1991-02-21 1998-08-20 Bekum Maschf Gmbh Process for the production of blown hollow bodies made of polypropylene
JP3294019B2 (en) * 1994-09-26 2002-06-17 株式会社青木固研究所 Stretch blow molding method for large containers
IT1282942B1 (en) * 1995-09-15 1998-04-02 Montell North America Inc STRETCH BLOW MOLDING PROCESS FOR THE PREPARATION OF POLYPROPYLENE CONTAINERS
MXPA04003914A (en) * 2001-10-24 2004-06-21 Pechiney Emballage Flexible Eu Polypropylene container and process for making it.
BRPI0406793A (en) * 2003-01-16 2006-02-07 Ian Orde Michael Jacobs Process for the manufacture of flexible thin-walled articles, polymeric blend, and, use of nanoparticles
AU2012206982B2 (en) * 2003-01-16 2013-12-05 Viva Healthcare Packaging Limited Methods, compositions and blends for forming articles having improved environmental stress crack resistance
DE10342742A1 (en) 2003-09-16 2005-05-12 Braun Melsungen Ag Container for infusion fluids
WO2022190077A1 (en) * 2021-03-12 2022-09-15 Nexe Innovations Inc. Thermoplastic article forming and annealing apparatus

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3944643A (en) * 1970-07-10 1976-03-16 Showa Denko K.K. Method for manufacturing shaped articles by injection-blow molding
DE2339019A1 (en) * 1973-08-01 1975-02-13 4 P Verpackungen Gmbh METHOD AND APPARATUS FOR MANUFACTURING HOLLOW BODIES BY INFLATING PREFORMES
DE2400951A1 (en) * 1974-01-09 1975-07-17 4 P Verpackungen Gmbh METHOD AND DEVICE FOR THE MANUFACTURING OF PLASTIC BOTTLES
US4054629A (en) * 1976-01-22 1977-10-18 American Can Company Transfer blow molding technique
FR2389479B1 (en) * 1977-05-06 1980-12-12 Carnaud Total Interplastic
JPS5949182B2 (en) * 1977-07-25 1984-12-01 住友化学工業株式会社 Polypropylene blow molding method
DE2953869C1 (en) * 1979-10-09 1989-06-08 Yoshino Kogyosho Co Ltd Process for making a polypropylene bottle
JPS56105935A (en) * 1980-01-26 1981-08-22 Mitsubishi Plastics Ind Ltd Forming of plastic bottle
US4356142A (en) * 1980-08-27 1982-10-26 Wheaton Industries Injection blow molding pet products
JPS5753326A (en) * 1980-09-17 1982-03-30 Dainippon Printing Co Ltd Manufacture of biaxially stretching blow molded vessel of saturated polyester
CA1220911A (en) * 1982-07-27 1987-04-28 Katashi Aoki Method for the temperature control of parison in injection stretching blow molding method

Also Published As

Publication number Publication date
DE3411905C2 (en) 1989-04-27
JPS59179318A (en) 1984-10-11
AU569067B2 (en) 1988-01-21
ES8503553A1 (en) 1985-03-01
AU2619784A (en) 1984-10-04
DE3411905A1 (en) 1984-10-04
IT1180016B (en) 1987-09-23
IT8467316A1 (en) 1985-09-30
FR2543483B1 (en) 1987-06-19
GB2139551A (en) 1984-11-14
FR2543483A1 (en) 1984-10-05
GB2139551B (en) 1986-09-10
ES531193A0 (en) 1985-03-01
IT8467316A0 (en) 1984-03-30
GB8408076D0 (en) 1984-05-10

Similar Documents

Publication Publication Date Title
RU2376328C2 (en) Container with walls from foamed material and method of its making
RU2060889C1 (en) Method of injection orientation blow moulding
JPH0356167B2 (en)
EP0908292A4 (en) Method and apparatus for producing a blow molded article
JPS6139223B2 (en)
JPH0952277A (en) Injection molding and stretch blow molding method for preform of polyester resin
EP0725722B1 (en) Method of forming molecularly oriented preforms
GB1530305A (en) Manufacture of hollow amorphous bi-oriented bodies
JP2931428B2 (en) Injection stretch blow molding method
CA1157611A (en) Injection stretching and blow holding process
MXPA04000960A (en) Methods for making polyethylene terephthalate (pet) preforms and containers such as food bottles, containers and intermediate preforms obtained.
US5498390A (en) Production of hollow articles from thermoplastics
GB2117698A (en) Making a two-layer parison by injection moulding
JPH09504240A (en) Molding method for molecularly oriented preform
US3655848A (en) Surface treatment of interior of parison preform
FR2097571A5 (en) Blow moulding thermoplastics - from injection moulded parisons
JPH0427520A (en) Injection orientation blow molding method
JPS6061228A (en) Molding method of plastic bottle
JPH06315959A (en) Injection molding method of polyethylene terephthalate
CN115181402B (en) Copolyester composition easy to extrude and blow and preparation method thereof
JP2592670B2 (en) Manufacturing method of polyester bottle
JPS63296921A (en) Injection orientation blow molding method for transparent polypropylene vessel
JPH04151227A (en) Manufacturing device for heat-resistant crystallized polyester resin vessel
US20110189417A1 (en) Process for preparing container having a foamed wall
ATE286454T1 (en) BLOW MOLDING PROCESS