JPH04244826A - Method and device for molding parison - Google Patents

Method and device for molding parison

Info

Publication number
JPH04244826A
JPH04244826A JP3029473A JP2947391A JPH04244826A JP H04244826 A JPH04244826 A JP H04244826A JP 3029473 A JP3029473 A JP 3029473A JP 2947391 A JP2947391 A JP 2947391A JP H04244826 A JPH04244826 A JP H04244826A
Authority
JP
Japan
Prior art keywords
parison
molding space
molding
lower opening
air
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
JP3029473A
Other languages
Japanese (ja)
Inventor
Mitsuyuki Urushibara
漆原　光之
Satoshi Araki
荒木　敏
Akira Tsuru
津留　昭
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.)
IHI Corp
Original Assignee
IHI Corp
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 IHI Corp filed Critical IHI Corp
Priority to JP3029473A priority Critical patent/JPH04244826A/en
Publication of JPH04244826A publication Critical patent/JPH04244826A/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
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • 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
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion blow-moulding
    • B29C49/0411—Means for defining the wall or layer thickness
    • B29C49/04114—Means for defining the wall or layer thickness for keeping constant thickness
    • 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
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • 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
    • B29C49/78—Measuring, controlling or regulating
    • B29C2049/787—Thickness
    • 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
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04—Extrusion 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
    • 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
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • B29C49/4244—Means for deforming the parison prior to the blowing operation during or after laying preform into the final mould
    • B29C49/4245—Means for deforming the parison prior to the blowing operation during or after laying preform into the final mould aided by air floating
    • 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
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • B29C49/4244—Means for deforming the parison prior to the blowing operation during or after laying preform into the final mould
    • B29C49/42454—The mould opening plane being vertical

Landscapes

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

Abstract

PURPOSE:To manufacture a product in uniform wall thickness. CONSTITUTION:A stopper 15 receiving the leading-out section of a parison 2 from the lower opening section 5a of a molding space 5 formed by a pair of molding dies 3, 4 is mounted into a suction pipe 6 connected to the lower opening section 5a of the molding space 5 in an approachable and separable manner to the lower opening section 5a of the molding space 5 by the forwarding-retreating movement of the piston rod 27 of a cylinder 26. The position of the parison 2 in the molding space 5 can be corrected by shifting the stopper 15, thus manufacturing products in uniform wall thickness.

Description

【発明の詳細な説明】[Detailed description of the invention]

【０００１】0001

【産業上の利用分野】本発明は、パリソン成形方法及び
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for forming a parison.

【０００２】0002

【従来の技術】三次元に変形した形状の各種樹脂製品を
ブロー成形するブロー成形設備としては、例えば図４に
示す如きものがある。2. Description of the Related Art An example of blow molding equipment for blow molding various resin products having three-dimensionally deformed shapes is shown in FIG.

【０００３】該ブロー成形設備は、ブロー成形機のパリ
ソンヘッド部分１の下端側に（パリソン押出側に）、パ
リソン２を成形する近接離反可能にして冷却ジャケット
を内装せる一対の成形用金型３，４が配設されており、
該一対の成形用金型３，４で形成される成形空間５の下
側開口部５ａに、成形空間５に外部への吸引作用を加え
ることにより、押出降下されたパリソン２を成形空間５
の下側開口部に導くための空気吸引装置の吸引管６が連
結されている。The blow molding equipment has a pair of molding molds 3 on the lower end side (on the parison extrusion side) of the parison head portion 1 of the blow molding machine, which are capable of approaching and separating the parison 2 and are equipped with a cooling jacket. , 4 are arranged,
By applying a suction action to the outside of the molding space 5 through the lower opening 5a of the molding space 5 formed by the pair of molding molds 3 and 4, the parison 2 that has been extruded and lowered is drawn into the molding space 5.
A suction tube 6 of an air suction device is connected to the lower opening of the air suction device.

【０００４】前記一対の成形用金型３，４の上面には、
成形空間５の上開口部５ｂにおいて上シャッタ７，８が
シリンダ９，１０により近接離反可能に設けられている
と共に、前記一対の成形用金型３，４の下面には、成形
空間５の下開口部５ａにおいて下シャッタ１１，１２が
シリンダ１３，１４により近接離反可能に設けられてお
り、前記吸引管６の空気吸引入口部分（成形空間５の下
開口部５ａとの連結部近傍部分）には網状のストッパ１
５が固着されており、更に該ストッパ１５又はその近辺
にパリソン２の先端が至ったことを検出する光学式パリ
ソン検出器１６が前記吸引管６に取付けられている。[0004] On the upper surface of the pair of molding molds 3 and 4,
Upper shutters 7 and 8 are provided in the upper opening 5b of the molding space 5 so as to be able to approach and separate from each other by means of cylinders 9 and 10. Lower shutters 11 and 12 are provided in the opening 5a so as to be able to approach and separate from each other by cylinders 13 and 14, and are provided at the air suction inlet portion of the suction pipe 6 (near the connecting portion with the lower opening 5a of the molding space 5). is a mesh stopper 1
Further, an optical parison detector 16 is attached to the suction tube 6 to detect when the tip of the parison 2 reaches the stopper 15 or its vicinity.

【０００５】上述のブロー成形設備においては下記の如
くして成形を行っていた。[0005] In the above-mentioned blow molding equipment, molding was performed in the following manner.

【０００６】即ち図示してない油圧シリンダ等の昇降用
アクチュエータで適宜コア１７を昇降することにより、
該コア１７のマンドレル部分１８と、パリソンヘッド本
体１９の下端に設置せるダイ２０との間の環状スリット
２１の隙間を調整し、油圧シリンダ等の押出用アクチュ
エータ２２でリングピストン２３を下降することにより
、リングアキュムレータ２４内に貯留された材料を環状
スリット２１から外部へ押出して所望肉厚のパリソン２
を押出す。このようにして押出されたパリソン２を、一
対の成形用金型３，４を近接移動し合着して形成した成
形空間５にその上開口部５ｂから挿入し、ブローピン２
５からパリソン２内に空気を吹込むと共に、吸引装置を
作動してその吸引管６から吸引作用を成形空間５内に生
ぜしめる。この吸引作用により成形空間５の上開口部５
ｂからパリソン２の外周面に沿い成形空間５の下開口部
５ａへ流れる気流が生じ、この気流によりパリソン２が
成形空間５内を屈曲しつつ挿通することになり、パリソ
ン２の先端が成形空間５の下開口部５ａから外部に導出
される。この導出されたパリソン２の導出端がストッパ
１５又はその近傍に至ると、パリソン２の導出端が光学
式パリソン検出器１６により検出されこの検出信号でパ
リソンヘッド部分１からのパリソン２の押出し、空気の
吹込み及び吸引が停止されると共に、上、下シャッタ７
，８，１１，１２の閉作動が行われる。即ちパリソン２
が成形空間５の下開口部５ａから適宜突出した状態でパ
リソン２の押出し、空気の吹込み及び吸引が停止され、
上シャッタ７，８により、コア１７のマンドレル部分１
８から突出しているブローピン２５の突出部外周面に位
置するパリソン２を挾着閉成すると共に、下シャッタ１
１，１２により、パリソン２の成形空間５の下開口部５
ａからの導出端開口を圧着閉成し、成形空間５内におけ
るパリソン２を密閉状態にしてブローピン２５からの空
気吹込み時の内圧を維持し得るようにする。しかる後に
ブローピン２５から空気を、成形空間５内におけるパリ
ソン２に吹込み該パリソン２を展張することにより、成
形用金型３，４の成形空間５内壁にパリソン２を密着せ
しめて内部が中空状の製品を製作していた。That is, by appropriately raising and lowering the core 17 using a lifting actuator such as a hydraulic cylinder (not shown),
By adjusting the gap of the annular slit 21 between the mandrel portion 18 of the core 17 and the die 20 installed at the lower end of the parison head body 19, and lowering the ring piston 23 with an extrusion actuator 22 such as a hydraulic cylinder. , the material stored in the ring accumulator 24 is extruded to the outside through the annular slit 21 to form a parison 2 with a desired wall thickness.
extrude. The parison 2 extruded in this way is inserted into the molding space 5 formed by moving the pair of molding molds 3 and 4 close to each other and joining them together, from the upper opening 5b.
At the same time, air is blown into the parison 2 from the molding space 5 through the suction tube 6 by operating the suction device. Due to this suction action, the upper opening 5 of the molding space 5
An air current flows from b to the lower opening 5a of the molding space 5 along the outer peripheral surface of the parison 2, and this air flow causes the parison 2 to pass through the molding space 5 while being bent, so that the tip of the parison 2 enters the molding space. 5 to the outside through the lower opening 5a. When the lead-out end of the parison 2 reaches the stopper 15 or its vicinity, the lead-out end of the parison 2 is detected by the optical parison detector 16, and this detection signal causes the parison 2 to be pushed out from the parison head portion 1 and the air to be drawn out. At the same time, the upper and lower shutters 7 are closed.
, 8, 11, and 12 are closed. That is parison 2
Extrusion of the parison 2, air blowing and suction are stopped in a state in which the parison 2 is appropriately protruded from the lower opening 5a of the molding space 5,
The mandrel portion 1 of the core 17 is removed by the upper shutters 7 and 8.
The parison 2 located on the outer peripheral surface of the protruding part of the blow pin 25 protruding from the lower shutter 1 is clamped and closed.
1 and 12, the lower opening 5 of the molding space 5 of the parison 2
The lead-out end opening from a is closed by crimping, and the parison 2 in the molding space 5 is sealed, so that the internal pressure when air is blown from the blow pin 25 can be maintained. Thereafter, air is blown from the blow pin 25 into the parison 2 in the molding space 5 to expand the parison 2, thereby bringing the parison 2 into close contact with the inner wall of the molding space 5 of the molding molds 3 and 4, making the inside hollow. was manufacturing products.

【０００７】[0007]

【発明が解決しようとする課題】しかしながら上述のブ
ロー成形設備にあっては、成形用金型３，４の成形空間
５の曲率の小さい部分（成形用金型３の３ａ部分、成形
用金型４の４ａ，４ｂ部分）にパリソン２が接触し、こ
のパリソン２の接触部分が成形用金型３，４により先に
冷却されるので、ブローアップした後にパリソン２の成
形用金型３，４との接触部分が伸ばされにくくなって他
の部分に比し肉厚が厚くなり、しかも図５に示す如く成
形空間５に対しパリソン２が片寄った状態にあるので、
パリソン２の成形用金型３，４の成形空間５内壁から離
れている部分は、パリソン２の成形用金型３，４の成形
空間５内壁から離れていない部分に比し一層膨張成形す
ることになってこの部分の肉厚が薄くなる。[Problems to be Solved by the Invention] However, in the above-mentioned blow molding equipment, the portions of the molding spaces 5 of the molding molds 3 and 4 having a small curvature (portion 3a of the molding mold 3, The parison 2 contacts the parts 4a and 4b of the parison 2, and the contact parts of the parison 2 are first cooled by the molding molds 3 and 4, so after blowing up, the molding molds 3 and 4 of the parison 2 Since the contact area with the mold is difficult to stretch and has a thicker wall thickness than other parts, and the parison 2 is in a biased state with respect to the molding space 5 as shown in FIG.
The parts of the molding molds 3 and 4 of the parison 2 that are away from the inner wall of the molding space 5 are subjected to more expansion molding than the parts of the molding molds 3 and 4 of the parison 2 that are not far from the inner wall of the molding space 5. The thickness of this part becomes thinner.

【０００８】従って均一な肉厚の中空状の製品を得るこ
とができず、製品品質にバラツキが生ずる不具合がある
。[0008] Therefore, it is impossible to obtain a hollow product with a uniform wall thickness, and there is a problem in that the quality of the product varies.

【０００９】本発明は、上記実情に鑑み均一な肉厚の製
品を製作できるパリソン成形方法及び装置を提供するこ
とを目的とするものである。SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a parison molding method and apparatus that can produce products with uniform wall thickness.

【００１０】0010

【課題を解決するための手段】本発明のパリソン成形方
法は、押出しパリソン内側に位置するようブローピンを
備えたパリソンヘッド部分からパリソンを、一対の成形
用金型により形成した成形空間に押出し降下させ、押出
し降下させたパリソン内にブローピンから空気を吹込む
と共に、前記成形空間の下開口部から空気を吸引してパ
リソンを成形空間の下開口部から導出せしめ、パリソン
の押出し、空気の吹込み及び吸引を停止し、次いで成形
空間の下開口部からのパリソンの導出部の一部を、成形
空間内へ押し戻して成形空間におけるパリソンの位置修
正を行い、しかる後にパリソンの成形空間の上下両開口
部からの突出部を閉塞してパリソン内にブローピンによ
り空気を吹込み成形するものである。[Means for Solving the Problems] The parison forming method of the present invention involves extruding a parison from a parison head portion equipped with a blow pin located inside the extruded parison and lowering the parison into a forming space formed by a pair of molding dies. , blowing air from a blow pin into the extruded and lowered parison, and sucking air from the lower opening of the molding space to lead out the parison from the lower opening of the molding space, extruding the parison, blowing air, and The suction is stopped, and then a part of the parison leading out from the lower opening of the molding space is pushed back into the molding space to correct the position of the parison in the molding space. The protrusion from the parison is closed and air is blown into the parison using a blow pin.

【００１１】又上記方法を実施するための装置は、押出
しパリソン内側に位置するようブローピンを備えたパリ
ソンヘッド部分の下側に、パリソンの成形空間を形成し
且つ該成形空間の上下両開口部においてパリソンを閉塞
するための上、下シャッタを備えた一対の成形用金型を
近接離反可能に配設し、前記成形空間の下開口部に吸引
装置の吸引管を連結し、該吸引管内に成形空間の下開口
部に対し近接離反可能にストッパを設けてなるものであ
る。[0011] Furthermore, the apparatus for carrying out the above method includes forming a parison molding space below the parison head portion provided with a blow pin located inside the extruded parison, and forming a parison molding space at both upper and lower openings of the molding space. A pair of molding molds equipped with upper and lower shutters for closing the parison are arranged so as to be able to approach and separate from each other, a suction pipe of a suction device is connected to the lower opening of the molding space, and molding is carried out within the suction pipe. A stopper is provided so as to be able to move toward and away from the lower opening of the space.

【００１２】0012

【作用】パリソンヘッド部分から押出し降下させて、パ
リソン内への空気吹込み及び成形空間への空気吸引によ
り成形空間の下開口部より導出したパリソンの一部を、
一対の成形用金型の成形空間内に押し戻す。この押し戻
しにより成形空間内におけるパリソンの位置修正が行わ
れ、一対の成形用金型の成形空間内壁とパリソンとの接
触をなくし得ると共に、成形空間の略中央部にパリソン
を位置せしめることができる。[Operation] A part of the parison is pushed out from the parison head part and guided out from the lower opening of the molding space by blowing air into the parison and suctioning air into the molding space.
It is pushed back into the molding space of a pair of molding molds. This pushing back corrects the position of the parison within the molding space, making it possible to eliminate contact between the parison and the inner wall of the molding space of the pair of molding dies, and to position the parison approximately in the center of the molding space.

【００１３】従ってパリソン内に空気を吹込み成形する
ことにより、均一な肉厚の製品を製作することができる
。[0013] Therefore, by blowing air into the parison, a product with uniform wall thickness can be manufactured.

【００１４】[0014]

【実施例】本発明の実施例を、図面に基づき説明する。[Embodiment] An embodiment of the present invention will be explained based on the drawings.

【００１５】図１〜図３は本発明の一実施例を示すもの
であり、基本的には前述の図４に示す従来のブロー成形
設備と同じであって、同一部分には同一符号を付してあ
り、説明は省略する。FIGS. 1 to 3 show an embodiment of the present invention, which is basically the same as the conventional blow molding equipment shown in FIG. The explanation will be omitted.

【００１６】以下、本発明の特有の構成について説明す
るに、網状のストッパ１５を吸引管６にその内壁に沿い
成形空間５の下開口部５ａに対し近接離反可能に配設す
ると共に、ストッパ１５にシリンダ２６のピストンロッ
ド２７の先端を連結してシリンダ２６のピストンロッド
２７の進退動によりストッパ１５の摺動を行い得るよう
にする。図中２８はパリソン２の位置を検出するパリソ
ン検出器を示す。The unique structure of the present invention will be described below. A net-like stopper 15 is disposed along the inner wall of the suction pipe 6 so as to be able to move toward and away from the lower opening 5a of the molding space 5. The tip of the piston rod 27 of the cylinder 26 is connected to the cylinder 26 so that the stopper 15 can be slid by moving the piston rod 27 of the cylinder 26 back and forth. In the figure, 28 indicates a parison detector that detects the position of the parison 2.

【００１７】以下、作用について説明する。The action will be explained below.

【００１８】パリソン２が成形空間５の下開口部５ａか
ら導出されその導出端がストッパ１５又はその近傍に至
ると光学式パリソン検出器１６により検出される。この
検出信号に基づきパリソン２の押出し、空気の吹込み及
び吸引を停止する。又シリンダ２６のピストンロッド２
７が適宜突出し、パリソン２の導出端を当接した状態で
ストッパ１５を成形空間５の下開口部５ａに近付ける方
向に移動する。上記ストッパ１５の移動により、パリソ
ン２の導出端の一部が成形空間５へ押し戻されることに
なる。即ち成形用金型３の３ａ部分、成形用金型４の４
ａ，４ｂ部分において、ストッパ１５を成形空間５の下
開口部５ａに近付く方向に移動することにより、パリソ
ン２が持ち上げられることになって該パリソン２が成形
用金型３，４の内壁から離れることになると共に、成形
用金型３の３ａ部分に対応する成形用金型４の凹部分、
該成形用金型４の４ａ，４ｂの部分に対応する成形用金
型３の凹部分においてパリソン２がより一層曲がり、パ
リソン２の成形空間５内における位置修正が行われて図
２及び図３に示す如く成形空間５の上開口部５ｂから下
開口部５ａに亘りパリソン２が略中央部に位置すること
になる。When the parison 2 is led out from the lower opening 5a of the molding space 5 and its leading end reaches the stopper 15 or its vicinity, it is detected by the optical parison detector 16. Based on this detection signal, extrusion of the parison 2, air blowing, and suction are stopped. Also, the piston rod 2 of the cylinder 26
7 protrudes as appropriate, and the stopper 15 is moved in the direction approaching the lower opening 5a of the molding space 5 while being brought into contact with the lead-out end of the parison 2. Due to the movement of the stopper 15, a part of the lead-out end of the parison 2 is pushed back into the molding space 5. That is, the 3a part of the molding die 3, the 4 part of the molding die 4
By moving the stopper 15 in the direction approaching the lower opening 5a of the molding space 5 at the portions a and 4b, the parison 2 is lifted and separated from the inner walls of the molding molds 3 and 4. In addition, a concave portion of the molding die 4 corresponding to the portion 3a of the molding die 3,
The parison 2 is further bent in the concave portion of the molding die 3 corresponding to the portions 4a and 4b of the molding die 4, and the position of the parison 2 within the molding space 5 is corrected, as shown in FIGS. 2 and 3. As shown in FIG. 2, the parison 2 is located approximately at the center of the molding space 5 from the upper opening 5b to the lower opening 5a.

【００１９】前記の如く適宜パリソン２を押し戻しパリ
ソン位置検出器２８でパリソン２の位置を確認する。上
記のようにしてパリソン位置検出器２８によるパリソン
２の位置検出信号に基づきシリンダ２６のピストンロッ
ド２７の突出量の調整を行う。次いで上シャッタ７，８
によりコア１７のマンドレル部分１８から突出している
ブローピン２５の突出部外周面に位置するパリソン２を
挾着閉成すると共に、下シャッタ１１，１２により、パ
リソン２の成形空間５からの導出端開口を圧着閉成し、
成形空間５内におけるパリソン２を気密状態にする。し
かる後にブローピン２５からパリソン２に空気を吹込む
が、その際にパリソン２は図２及び図３に示す如く成形
用金型３，４の成形空間５内壁より適宜離れ該成形空間
５の全域に亘り略中央部に位置しているので、ブローピ
ン２５の吹込み空気により、パリソン２は径方向に等し
く展張して成形用金型３，４の成形空間５内壁に密着す
ることになり、内部が中空状で略均一な肉厚の製品を製
作することができる。又ブロー成形するに際し、パリソ
ン２を押し戻すのでバリになる部分を少なくできて歩留
り向上を図り得る。As described above, the parison 2 is pushed back as appropriate and the position of the parison 2 is confirmed by the parison position detector 28. As described above, the amount of protrusion of the piston rod 27 of the cylinder 26 is adjusted based on the position detection signal of the parison 2 by the parison position detector 28. Next, upper shutters 7 and 8
The parison 2 located on the outer peripheral surface of the protrusion of the blow pin 25 protruding from the mandrel portion 18 of the core 17 is clamped and closed, and the opening of the lead-out end of the parison 2 from the molding space 5 is closed by the lower shutters 11 and 12. Crimp and close.
The parison 2 in the molding space 5 is made airtight. After that, air is blown into the parison 2 from the blow pin 25, but at that time, the parison 2 is appropriately separated from the inner wall of the molding space 5 of the molding molds 3 and 4 and spreads over the entire area of the molding space 5, as shown in FIGS. 2 and 3. Since it is located approximately in the center, the parison 2 is equally expanded in the radial direction by the air blown by the blow pin 25 and comes into close contact with the inner wall of the molding space 5 of the molding molds 3 and 4, so that the inside becomes It is possible to manufacture hollow products with approximately uniform wall thickness. Furthermore, since the parison 2 is pushed back during blow molding, the number of burrs can be reduced and the yield can be improved.

【００２０】尚本発明は、図示し説明した実施例にのみ
限定されることなく、例えばストッパの移動をモータ及
びスクリューロッドのアクチュエータにより行うこと、
ストッパの移動を作業員が手作業で行うこと等は任意で
あり、その他、本発明の要旨を逸脱しない限り種々の変
更を加え得ることは勿論である。The present invention is not limited to the illustrated and described embodiments; for example, the stopper may be moved by a motor and an actuator of a screw rod;
It is optional for an operator to manually move the stopper, and it goes without saying that various changes can be made without departing from the gist of the present invention.

【００２１】[0021]

【発明の効果】以上述べたように本発明のパリソン成形
方法及び装置によれば、いずれにおいてもパリソンに偏
肉が生ずることを略なくし得て均一な肉厚の中空状製品
を製作でき、製品品質の向上をなし得ると共に、パリソ
ンを成形空間に押し戻すことによりバリの量を少なくで
きて歩留りを向上でき、経済的である、等の種々の優れ
た効果を発揮する。As described above, according to the parison molding method and apparatus of the present invention, uneven thickness of the parison can be almost eliminated, hollow products with uniform wall thickness can be manufactured, and the In addition to improving quality, it also exhibits various excellent effects such as being able to reduce the amount of burrs by pushing the parison back into the molding space, improving yield, and being economical.

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

【図１】本発明のパリソン成形装置の構成要領を示す縦
断面図である。FIG. 1 is a longitudinal sectional view showing the configuration of a parison forming apparatus of the present invention.

【図２】本発明のパリソン成形装置によるパリソン成形
状態を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing a parison forming state by the parison forming apparatus of the present invention.

【図３】図２のＩＩＩ−ＩＩＩ方向矢視図である。FIG. 3 is a view taken along arrows III-III in FIG. 2;

【図４】従来のブロー成形設備の構成要領を示す縦断面
図である。FIG. 4 is a longitudinal sectional view showing the configuration of conventional blow molding equipment.

【図５】図４のＶ−Ｖ方向矢視図である。FIG. 5 is a view taken along the line V-V in FIG. 4;

【符号の説明】[Explanation of symbols]

１　　　　　　　　　　パリソンヘッド部分２　　　　
　　　　　　パリソン ３，３ａ，４，４ａ，４ｂ　　　　　　　　　　成形用
金型５　　　　　　　　　　成形空間 ５ａ　　　　　　　　下開口部 ５ｂ　　　　　　　　上開口部 ６　　　　　　　　　　吸引管 ７，８　　　　　　上シャッタ １１，１２　　下シャッタ １５　　　　　　　　ストッパ ２５　　　　　　　　ブローピン1 Parison head part 2
Parison 3, 3a, 4, 4a, 4b Molding mold 5 Molding space 5a Lower opening 5b Upper opening 6 Suction pipes 7, 8 Upper shutter 11, 12 Lower shutter 15 Stopper 25 Blow pin

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】　　押出しパリソン内側に位置するようブ
ローピンを備えたパリソンヘッド部分からパリソンを、
一対の成形用金型により形成した成形空間に押出し降下
させ、押出し降下させたパリソン内にブローピンから空
気を吹込むと共に、前記成形空間の下開口部から空気を
吸引してパリソンを成形空間の下開口部から導出せしめ
、パリソンの押出し、空気の吹込み及び吸引を停止し、
次いで成形空間の下開口部からのパリソンの導出部の一
部を、成形空間内へ押し戻して成形空間におけるパリソ
ンの位置修正を行い、しかる後にパリソンの成形空間の
上下両開口部からの突出部を閉塞してパリソン内にブロ
ーピンにより空気を吹込み成形することを特徴とするパ
リソン成形方法。[Claim 1] A parison is removed from a parison head portion provided with a blow pin to be located inside the extruded parison.
The parison is extruded and lowered into a molding space formed by a pair of molding molds, and air is blown into the extruded and lowered parison from a blow pin, and air is sucked from the lower opening of the molding space to move the parison below the molding space. the parison from the opening, extruding the parison, stopping air blowing and suction,
Next, a part of the parison leading out from the lower opening of the molding space is pushed back into the molding space to correct the position of the parison in the molding space, and then the protruding parts of the parison from both the upper and lower openings of the molding space are pushed back into the molding space. A parison forming method characterized by blowing air into the parison with a blow pin after closing the parison. 【請求項２】　　押出しパリソン内側に位置するようブ
ローピンを備えたパリソンヘッド部分の下側に、パリソ
ンの成形空間を形成し且つ該成形空間の上下両開口部に
おいてパリソンを閉塞するための上、下シャッタを備え
た一対の成形用金型を近接離反可能に配設し、前記成形
空間の下開口部に吸引装置の吸引管を連結し、該吸引管
内に成形空間の下開口部に対し近接離反可能にストッパ
を設けてなることを特徴とするパリソン成形装置。2. Upper and lower openings for forming a parison molding space and closing the parison at both upper and lower openings of the molding space are provided on the lower side of the parison head portion equipped with a blow pin located inside the extruded parison. A pair of molding molds equipped with shutters are arranged so as to be able to approach and separate from each other, a suction pipe of a suction device is connected to the lower opening of the molding space, and a suction pipe of a suction device is connected to the lower opening of the molding space so as to be able to approach and separate from each other. A parison forming device characterized by being provided with a stopper.
JP3029473A 1991-01-30 1991-01-30 Method and device for molding parison Pending JPH04244826A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3029473A JPH04244826A (en) 1991-01-30 1991-01-30 Method and device for molding parison

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3029473A JPH04244826A (en) 1991-01-30 1991-01-30 Method and device for molding parison

Publications (1)

Publication Number Publication Date
JPH04244826A true JPH04244826A (en) 1992-09-01

Family

ID=12277067

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3029473A Pending JPH04244826A (en) 1991-01-30 1991-01-30 Method and device for molding parison

Country Status (1)

Country Link
JP (1) JPH04244826A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1083038A2 (en) * 1999-09-07 2001-03-14 Fischer-W. Müller Blasformtechnik GmbH Blow moulding apparatus for producing hollow shaped articles
CN102267178A (en) * 2011-08-30 2011-12-07 扬州市华光双瑞实业有限公司 Forming head of pipe making machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1083038A2 (en) * 1999-09-07 2001-03-14 Fischer-W. Müller Blasformtechnik GmbH Blow moulding apparatus for producing hollow shaped articles
EP1083038A3 (en) * 1999-09-07 2003-02-05 SIG Kautex GmbH & Co. KG Blow moulding apparatus for producing hollow shaped articles
CN102267178A (en) * 2011-08-30 2011-12-07 扬州市华光双瑞实业有限公司 Forming head of pipe making machine
CN102267178B (en) * 2011-08-30 2014-07-30 扬州市华光双瑞实业有限公司 Forming head of pipe making machine

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