JPS585233A - Method of forming biaxially oriented bottle of synthetic resin - Google Patents

Method of forming biaxially oriented bottle of synthetic resin

Info

Publication number
JPS585233A
JPS585233A JP56103930A JP10393081A JPS585233A JP S585233 A JPS585233 A JP S585233A JP 56103930 A JP56103930 A JP 56103930A JP 10393081 A JP10393081 A JP 10393081A JP S585233 A JPS585233 A JP S585233A
Authority
JP
Japan
Prior art keywords
parison
rod
mold
bottle
stretching
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.)
Pending
Application number
JP56103930A
Other languages
Japanese (ja)
Inventor
Takuzo Takada
高田　卓三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yoshino Kogyosho Co Ltd
Original Assignee
Yoshino Kogyosho Co Ltd
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 by Yoshino Kogyosho Co Ltd filed Critical Yoshino Kogyosho Co Ltd
Priority to JP56103930A priority Critical patent/JPS585233A/en
Publication of JPS585233A publication Critical patent/JPS585233A/en
Pending 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
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods
    • 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
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods
    • B29C49/1208—Stretching rods using additional means to clamp the preform bottom while stretching the preform

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To form a bottle with the uniform thickness of the lower part, by clamping a heated parison in molds, pushing down the parison clamped between an orienting rod and a deviation preventing rod, and further biaxially orienting the parison transversely by compressed air. across it and at the same time forming a threaded section to the parison. CONSTITUTION:The upper end of the parison 7 is clamped between bottle neck forming section 1a, 1a of molds 1, 1 to depend the parison 7, the orienting rod 8 is inserted into the parison and at the same time the deviation preventing rod 4 is lifted up to clamp the parison bottom between the lower end surface of the orientating rod 8 and the top surface of the deviation preventing rod 4. With the parison bottom clamped between the rods, both the rods are lowered to orient the parison longitudinally. Further, compressed air is blown into the parison to orient it transversely.

Description

【発明の詳細な説明】 本発明は合成樹脂與二軸延伸壜の創造方法に関する。[Detailed description of the invention] The present invention relates to a method of creating a synthetic resin biaxially stretched bottle.

二軸延伸場は、極めて機械的強度が大で、近時注目全集
めているが、特にｌｌｌ入具以上比較的大形の肉薄壜の
場合、壜下部に肉厚の偏ｂｔ生じ易く、すると肉薄部分
の強度が低下する欠点があった。The biaxial stretching field has extremely high mechanical strength and has been attracting a lot of attention recently, but especially in the case of relatively large thin-walled bottles with 1/4 inch or more, the wall thickness tends to be uneven at the bottom of the bottle. There was a drawback that the strength of the thin parts was reduced.

本発明は上記欠点を除去して、下部がはソ均一な肉厚の
合成樹脂裂二軸延伸壜が得られるようにしたものであシ
、以下図面について説明する。The present invention eliminates the above-mentioned drawbacks and makes it possible to obtain a synthetic resin split biaxially stretched bottle having a uniform wall thickness at the lower part.The present invention will be described below with reference to the drawings.

１．１は吹込み成形用金型、２．２はその金型内面に設
けられた増成形用のキャビティで、３は壜の底壁部分成
形用金型である。金型１．１の少くとも一方は横方向に
移動し、型締めおよび型開きが可能である。1.1 is a mold for blow molding, 2.2 is a cavity provided on the inner surface of the mold for additional molding, and 3 is a mold for molding the bottom wall portion of the bottle. At least one of the molds 1.1 can be moved laterally and can be closed and opened.

金型３を貫通させて、金型１．ｌの型締めによってキャ
ピテイによシ形成される墳形状空間の中心軸線上を、棒
の中心軸線が通って該空間に対して出入可能に偏心防止
用棒４が突出させてあり、該棒は金型３下方に垂直に設
けられたガイド孔５内を上下動する保持部６により支持
させである。Penetrate the mold 3 and insert the mold 1. The center axis of the rod passes over the center axis of the mound-shaped space formed by the cavity by the mold clamping of l, and an eccentricity prevention rod 4 projects so as to be able to move in and out of the space. The mold 3 is supported by a holding part 6 that moves up and down in a guide hole 5 provided vertically below it.

二軸延伸壜の成形に際しては、上記金型のキャビティが
形成する空間内に、上端部を金型１．１の増目頚部形成
部分１ａ　、　ｌａにより挾持させてノ（リソン７全垂
下させ、そのパリソン内には延伸棒８を挿入させて該棒
下端をパリソンの底壁内面に当て、押下けることで縦軸
方向に延伸させるが、その押下げに先だち、既述偏心防
止棒の上端面と、延伸棒下端面との間でパリソン底部を
挾持させ、該挾持状態を保ったま＼、上記内棒を共に下
降させることで、第２図が示すように伸ばす。このよう
に伸ばした後、或いは内棒の下降時にパリソン内へ圧縮
空気を吹込み、横軸方向への延伸を行う。When forming a biaxially stretched bottle, the upper end portion is held between the widened neck forming portions 1a and 1a of the mold 1.1 in the space formed by the cavity of the mold. A stretching rod 8 is inserted into the parison, the lower end of the rod is pressed against the inner surface of the bottom wall of the parison, and the rod is stretched in the longitudinal axis direction by pressing down. , the bottom of the parison is clamped between the lower end surface of the stretching rod, and while maintaining this clamped state, the inner rod is lowered together to stretch it as shown in Figure 2. After stretching in this way, or When the inner rod descends, compressed air is blown into the parison to stretch it in the transverse direction.

パリノン底部の挟持を確実にするため、延伸棒下端面と
偏／し防止棒の上端面とは、互いに合致する形状の凸と
凹との球面状゛に形成するとよい。パリソン内への圧縮
空気の吹込みは、延伸棒を抜き出した後、或いは延伸棒
を挿入させたま＼の状態で、該延伸棒の外周面とパリソ
ン上端部内面との間から行ってもよいが、その延伸棒に
圧縮空気導入路９を設けておき、該導入路を利用して行
うことも出来る。In order to securely hold the bottom of the parinon, the lower end surface of the stretching rod and the upper end surface of the anti-biasing rod are preferably formed into spherical shapes with convexes and concavities that match each other. Compressed air may be blown into the parison from between the outer circumferential surface of the stretching rod and the inner surface of the upper end of the parison after the stretching rod is removed or while the stretching rod is inserted. It is also possible to provide a compressed air introduction path 9 in the elongated rod and use this introduction path.

本発明方法は、上記のようにキャビティが形成する墳形
状空間内へ垂下するパリソン内へ挿入された延伸棒下端
と、金型の１底壁形成部分中心を貫通させて、キャビテ
ィが型締め状態において形成する墳形状空間の中心軸線
上を棒の中心軸線が通って出入可能に設けた偏心防止用
棒上端との間で、上記パリソンの底壁を挾持させ、該挾
持状態を保ったま＼上記内棒を垂下させてパリノン縦軸
方向の延伸を行うから、延伸棒だけでパリソン底壁を押
下ける場合に比べて延伸棒がグラつき、そのためパリソ
ン底壁の中心が、キャピテイが形成する墳形状空間の中
心軸線上から外れることがなく、よってパリソン膨張に
際して壜下部の肉厚に偏Ｄｋ生ずることがなく、このよ
うにしてはソ均一な肉厚の合成樹脂與二軸延伸壜とする
ことが出来るものである。In the method of the present invention, the lower end of the drawing rod inserted into the parison that hangs down into the mound-shaped space formed by the cavity as described above is passed through the center of one bottom wall forming part of the mold, so that the cavity is in the mold-clamped state. The bottom wall of the above-mentioned parison is held between the upper end of the eccentricity prevention rod, which is provided so that the center axis of the rod passes over the center axis of the mound-shaped space formed in Since the inner rod is allowed to hang down to stretch the parison in the longitudinal axis direction, the drawer rod becomes wobbly compared to when the bottom wall of the parison is pushed down only with the drawer rod, and as a result, the center of the bottom wall of the parison is drawn into the shape of the mound formed by the capitei. Since it does not deviate from the center axis of the space, there is no unevenness Dk in the wall thickness at the bottom of the bottle when the parison expands, and in this way, it is possible to make a synthetic resin biaxially stretched bottle with a uniform wall thickness. It is possible.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、金型内にパリソンを垂下させ、該パリソン内
に挿入させた二軸延伸壜下端と金型下方から突出させた
偏心防止用棒上端とで）ζ１ノンン底壁を挾持させた状
態を示す断面図、第２図は、第１図の状態から、内棒を
下降させ、パリソンを縦軸方向に延伸させた状態での断
面図である。 １・・・金　　　型　　　　２・・・キャビティ４・・
・偏心防止用棒　　　７・・・ノクリソン８・・・延　
伸　棒　　　　９・・・圧縮空気導入路特許出願人　　
株式会社吉野工業所 ザ・ 代表者　百　野　弥太１ｃ・ ノIn Figure 1, a parison is suspended in a mold, and the bottom wall of the ζ1 nonn is sandwiched between the lower end of the biaxially stretched bottle inserted into the parison and the upper end of an eccentricity prevention rod protruding from below the mold. A cross-sectional view showing the state, FIG. 2, is a cross-sectional view of the state shown in FIG. 1 with the inner rod lowered and the parison stretched in the longitudinal direction. 1... Mold 2... Cavity 4...
・Eccentricity prevention rod 7... Noclison 8...
Extension rod 9... Compressed air introduction path patent applicant
Yoshino Industries Co., Ltd. Representative Yata Hyakuno 1c.

Claims (1)

【特許請求の範囲】[Claims] 増成形用金型のキャビティが型締め状態において形成す
る墳形状空間の中心軸線上を、棒の中心軸線が通って該
空間に対して出入可能に、該金型の１底壁形成部分中心
全貫通させて偏心防止用棒を設けた壜吹込み成形用金型
を用い、該金型の増目頚部形成部分により上端部を挾持
させて上記空間内にパリソンを垂設させ、該パリソン内
に延伸棒を挿入させ、該延伸棒下端面と上記偏心防止用
棒の上端面との間でパリソン底壁を挾持させ、該挾持状
態を保ったま＼上記内棒を共に下降させることで、上記
パリソンを縦軸方向に延伸させ、該延伸と同時或いは延
伸後、パリソン内に圧縮空気を吹込み二軸延伸壜全成形
させることを特徴とする合成樹脂久二軸延伸壜の創造方
法。The center axis of the rod passes over the center axis of the mound-shaped space formed by the cavity of the expansion mold in the mold-clamped state, and the entire center of one bottom wall forming part of the mold is moved in and out of the space. Using a mold for bottle blow molding which is penetrated and provided with a rod to prevent eccentricity, a parison is suspended in the space with the upper end held by the widened neck forming part of the mold, and the parison is placed inside the parison. By inserting a stretching rod, sandwiching the parison bottom wall between the lower end surface of the stretching rod and the upper end surface of the eccentric prevention rod, and lowering the inner rod together while maintaining the clamped state, the parison 1. A method for creating a biaxially stretched synthetic resin bottle, which comprises stretching a synthetic resin in the longitudinal axis direction, and blowing compressed air into the parison at the same time as or after the stretching to completely form the biaxially stretched bottle.
JP56103930A 1981-07-02 1981-07-02 Method of forming biaxially oriented bottle of synthetic resin Pending JPS585233A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56103930A JPS585233A (en) 1981-07-02 1981-07-02 Method of forming biaxially oriented bottle of synthetic resin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56103930A JPS585233A (en) 1981-07-02 1981-07-02 Method of forming biaxially oriented bottle of synthetic resin

Publications (1)

Publication Number Publication Date
JPS585233A true JPS585233A (en) 1983-01-12

Family

ID=14367144

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56103930A Pending JPS585233A (en) 1981-07-02 1981-07-02 Method of forming biaxially oriented bottle of synthetic resin

Country Status (1)

Country Link
JP (1) JPS585233A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5273966A (en) * 1975-12-17 1977-06-21 Toyo Seikan Kaisha Ltd Blow molded structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5273966A (en) * 1975-12-17 1977-06-21 Toyo Seikan Kaisha Ltd Blow molded structure

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