JP2658590B2 - Blow molding method - Google Patents

Blow molding method

Info

Publication number
JP2658590B2
JP2658590B2 JP3009586A JP958691A JP2658590B2 JP 2658590 B2 JP2658590 B2 JP 2658590B2 JP 3009586 A JP3009586 A JP 3009586A JP 958691 A JP958691 A JP 958691A JP 2658590 B2 JP2658590 B2 JP 2658590B2
Authority
JP
Japan
Prior art keywords
parison
main body
molded article
mold
hollow molded
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 - Lifetime
Application number
JP3009586A
Other languages
Japanese (ja)
Other versions
JPH04244828A (en
Inventor
立志 石井
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.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor 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 Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP3009586A priority Critical patent/JP2658590B2/en
Publication of JPH04244828A publication Critical patent/JPH04244828A/en
Application granted granted Critical
Publication of JP2658590B2 publication Critical patent/JP2658590B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • 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
    • B29C49/4242—Means for deforming the parison prior to the blowing operation
    • B29C49/4247—Means for deforming the parison prior to the blowing operation using spreading or extending means
    • 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
    • B29C49/48—Moulds
    • 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
    • B29C49/48—Moulds
    • B29C49/48185—Moulds with more than one separate mould cavity
    • 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
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2008—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements inside the article
    • 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
    • B29C49/20—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor of articles having inserts or reinforcements ; Handling of inserts or reinforcements
    • B29C2049/2021—Inserts characterised by the material or type
    • B29C2049/2047—Tubular inserts, e.g. tubes
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0063—Cutting longitudinally
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0081—Shaping techniques involving a cutting or machining operation before shaping
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0017—Combinations of extrusion moulding with other shaping operations combined with blow-moulding or thermoforming
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • 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
    • B29C49/42454—The mould opening plane being vertical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7172—Fuel tanks, jerry cans

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)

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、主として中空容器の成
形に用いられるブロー成形法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding method mainly used for molding a hollow container.

【０００２】[0002]

【従来の技術】車両に用いられる合成樹脂製の燃料タン
クの中には、図５および図６に示すように、中空成形品
本体たるタンク本体１と、このタンク本体１から延長す
る別部材たる単数または複数のフィラーチューブ２とを
備えているものがある。2. Description of the Related Art In a synthetic resin fuel tank used for a vehicle, as shown in FIGS. 5 and 6, a tank body 1 as a hollow molded article body and a separate member extending from the tank body 1 are provided. Some include one or more filler tubes 2.

【０００３】図３および図４は、上記燃料タンクの成形
に用いられるブロー成形法を示すものである。このブロ
ー成形法は、タンク本体形成部３，４とこのタンク本体
形成部３，４から延長する膨出部たるパイプ形成部５，
６とを有する左右一対の金型間７，８に、予備成形され
たパリソンＰをドローダウンし、このパリソンＰの内部
にエクスパンダノズル９とブローノズル１０とを挿入
し、このパリソンＰをエクスパンダノズル９から噴射さ
れる空気で筒状に形状保持しつつ、このパリソンＰを一
対の金型７，８により挟み込んで、パリソンＰ内部を完
全密封とした上で、ブローノズル１０からパリソンＰ内
部に空気を吹き込むことにより、タンク本体１とフィラ
ーチューブ２と一体成形する。FIGS. 3 and 4 show a blow molding method used for molding the fuel tank. This blow molding method includes a tank body forming portion 3 and 4 and a pipe forming portion 5 which is a bulging portion extending from the tank body forming portion 3 and 4.
6, the preformed parison P is drawn down between the pair of right and left molds 7 and 8 having the mold 6 and the expander nozzle 9 and the blow nozzle 10 are inserted into the parison P. The parison P is sandwiched between a pair of molds 7 and 8 to completely seal the inside of the parison P while holding the shape of the parison P in a cylindrical shape with the air injected from the panda nozzle 9. The tank body 1 and the filler tube 2 are integrally formed by blowing air into the tank.

【０００４】[0004]

【発明が解決しようとする課題】しかし、前述のブロー
成形法では、タンク本体１からフィラーチューブ２を延
長するために、パイプ形成部がタンク本体形成部３から
金型７，８の型閉め方向に急角度に膨出している。この
ため、金型７，８でパリソンＰを挟み込んでパリソンＰ
内部を完全密封する過程において、パリソンＰの一部が
パイプ形成部５に引っ張られ、パリソンＰのタンク本体
形成部３とパイプ形成部５との間に位置する部分が薄肉
になり易いことが指摘されている。However, in the blow molding method described above, in order to extend the filler tube 2 from the tank main body 1, the pipe forming portion is moved from the tank main body forming portion 3 to the mold closing direction of the dies 7, 8. Bulging at a steep angle. Therefore, the parison P is sandwiched between the molds 7 and 8 and
In the process of completely sealing the inside, it is pointed out that a part of the parison P is pulled by the pipe forming part 5 and the part of the parison P located between the tank body forming part 3 and the pipe forming part 5 tends to be thin. Have been.

【０００５】しかも、上記薄肉部分の発生した燃料タン
クをそのまま使用した場合には、燃料タンクの強度低下
や燃料透過という問題が発生するので、上記のような薄
肉部分の発生した燃料タンクを不良品として破棄してい
るのが現状である。In addition, if the fuel tank having the thin portion is used as it is, problems such as a decrease in the strength of the fuel tank and fuel permeation occur. Therefore, the fuel tank having the thin portion is defective. It is currently discarded as.

【０００６】[0006]

【課題を解決するための手段】そこで本発明にあって
は、中空成形品本体形成部とこの中空成形品本体形成部
から型閉め方向に膨出された膨出部とを有する左右一対
の金型間に、予備成形されたパリソンをドローダウン
し、このパリソンの内部にエクスパンダノズルとブロー
ノズルとを挿入し、このパリソンを前記一対の金型によ
り挟み込んで、パリソン内部を完全密封とした上で、ブ
ローノズルからパリソン内部に空気を吹き込むことによ
り、中空成形品とこの中空成形品から延長する別部材と
を一体成形するブロー成形法において、前記ドローダウ
ンするパリソンの金型による挟み込み開始までの間に、
前記パリソンの金型による挟み込みに伴って成形品本体
形成部と膨出部との間で薄肉となる部分に、ドローダウ
ン方向に沿った切り込みを入れることを特徴とする。Accordingly, in the present invention, a pair of left and right gold members having a hollow molded article main body forming portion and a swelling portion protruding from the hollow molded article main body forming portion in the mold closing direction are provided. Between the molds, the preformed parison is drawn down, an expander nozzle and a blow nozzle are inserted into the parison, and the parison is sandwiched between the pair of molds to completely seal the inside of the parison. By blowing air from the blow nozzle into the parison inside, in the blow molding method of integrally molding the hollow molded product and another member extending from the hollow molded product, the blow-down parison until the start of sandwiching by the mold of the parison. Between,
It is characterized in that a cut is made along the draw-down direction in a thin portion between the molded article main body forming portion and the bulging portion as the parison is sandwiched by the mold.

【０００７】[0007]

【作用】ドローダウン方向に沿った切り込みにより、パ
リソンの金型による挟み込み過程において、パリソンの
一部が引っ張られることなく、パリソンの切り込みで分
割された中空成形品本体部分とパイプ部分それぞれが、
金型の中空成形品本体形成部と膨出部とに対応配置され
る。[Action] By cutting along the drawdown direction, in the process of sandwiching the parison with the mold, the part of the parison is not pulled and the hollow molded article main body portion and the pipe portion divided by the parison notch are each formed.
It is arranged corresponding to the hollow molded article main body forming portion and the bulging portion of the mold.

【０００８】[0008]

【実施例】以下、本発明の一実施例を前述した従来例と
同一部分に同一符号を付して詳述する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail with the same reference numerals being given to the same parts as those of the above-mentioned conventional example.

【０００９】図１および図２は、タンク本体１と別部材
たる単数のフィラーチューブ２とからなる燃料タンクの
成形に用いられるブロー成形法を示すものである。この
ブロー成形法では、左右一対の金型７Ａ，８Ａが、タン
ク本体形成部３，４とこのタンク本体形成部３，４から
型閉め方向に膨出された膨出部たるパイプ形成部５，６
とを有している。この金型７Ａ，８Ａのタンク本体形成
部３，４とパイプ形成部５，６との連設隅部には、金型
７Ａ，８Ａの型閉め方向に貫通するガイド孔１１，１２
が形成してある。この一方の金型７Ａのガイド孔１１か
ら他方の金型８Ａのガイド孔１２に、パリソンＰと非溶
着性の有る金属やガラスのような材料からなる線状部材
１３を貫通してある。この線状部材１３は、パリソンＰ
のドローダウン方向から見て、エクスパンダノズル９と
ブローノズル１０との間に位置している。FIGS. 1 and 2 show a blow molding method used for molding a fuel tank comprising a tank body 1 and a single filler tube 2 as a separate member. In this blow molding method, a pair of left and right dies 7A, 8A are formed into tank body forming portions 3, 4 and pipe forming portions 5, which are bulging portions bulging from the tank body forming portions 3, 4 in the mold closing direction. 6
And Guide holes 11, 12 penetrating in the mold closing direction of the dies 7A, 8A are provided at the corners where the tank body forming portions 3, 4 and the pipe forming portions 5, 6 of the dies 7A, 8A are connected.
Is formed. From the guide hole 11 of the one mold 7A to the guide hole 12 of the other mold 8A, a linear member 13 made of a material such as a metal or glass which is not weldable to the parison P is penetrated. This linear member 13 is a parison P
Is located between the expander nozzle 9 and the blow nozzle 10 when viewed from the drawdown direction.

【００１０】そして、タンク本体１とフィラーチューブ
２とを有する燃料タンクをブロー成形するには、図１に
示すように、左右一対の金型７Ａ，８Ａを型開きした状
態において、この金型７Ａ，８Ａ間に、予備成形された
パリソンＰをドローダウンする。In order to blow-mold a fuel tank having a tank body 1 and a filler tube 2, as shown in FIG. 1, a pair of left and right dies 7A, 8A are opened and the dies 7A are opened. , 8A, draw down the preformed parison P.

【００１１】すると、図２に示すように、上記ドローダ
ウンに伴って、パリソンＰのタンク本体形成部３，４と
パイプ形成部５，６との間で薄肉となる部分に、切り込
み１５がドローダウン方向に沿って入る。これと並行し
て、この切り込み１５で分割されたタンク本体形成部側
パリソン部分Ｐ１の内部には、エクスパンダノズル９を
挿入し、上記切り込み１５で分割されたパイプ形成部側
パリソン部分Ｐ２内部には、ブローノズル１０を挿入
し、エクスパンダノズル９から噴射される空気で筒状に
形状保持しておく。Then, as shown in FIG. 2, a cut 15 is made in the thin portion between the tank body forming portions 3, 4 and the pipe forming portions 5, 6 of the parison P with the drawdown. Enter along the down direction. In parallel with this, an expander nozzle 9 is inserted into the inside of the tank body forming part side parison part P1 divided by the notch 15, and the inside of the pipe forming part side parison part P2 divided by the notch 15 is inserted. Inserts the blow nozzle 10 and keeps it in a cylindrical shape with the air injected from the expander nozzle 9.

【００１２】引き続き、金型７Ａ，８Ａを型閉めする
と、金型７Ａ，８Ａのガイド孔１１，１２が線状部材１
３に沿って線状部材１３をそのままの状態にしつつ移動
し、閉型する金型７Ａ，８Ａが、分割されたパリソン部
分Ｐ１，Ｐ２を含むパリソンＰを挟み込み、パリソンＰ
内部を完全密封とするとともに、エクスパンダノズル９
を分割されたパリソン部分Ｐ１から引き抜き、ブローノ
ズル１０をパイプ形成部５，６の凹部で分割されたパリ
ソン部分Ｐ２を介して挟み込む。この状態において、ブ
ローノズル１０からパリソンＰ内部に図外の圧力調整手
段で圧力調整されたブロー成形用の空気を吹き込む。こ
れにより、上記分割されたパリソン部分Ｐ１，Ｐ２を含
むパリソンＰが金型７Ａ，８Ａのタンク形成部３，４と
パイプ形成部５，６との壁面に押し付けられて、タンク
本体１とフィータチューブ２との一体成形された燃料タ
ンクが成形される。Subsequently, when the dies 7A and 8A are closed, the guide holes 11 and 12 of the dies 7A and 8A are
The metal molds 7A and 8A that move while keeping the linear member 13 as it is along the third member 3 sandwich the parison P including the divided parison portions P1 and P2, and
While completely sealing the inside, the expander nozzle 9
Is drawn out of the divided parison part P1, and the blow nozzle 10 is sandwiched between the divided parison parts P2 by the recesses of the pipe forming parts 5, 6. In this state, blow molding air whose pressure has been adjusted by a pressure adjusting means (not shown) is blown into the parison P from the blow nozzle 10. As a result, the parison P including the divided parison portions P1 and P2 is pressed against the wall surfaces of the tank forming portions 3 and 4 and the pipe forming portions 5 and 6 of the dies 7A and 8A, and the tank body 1 and the feeder A fuel tank integrally formed with the tube 2 is formed.

【００１３】次に、成形された燃料タンクの冷却固化を
待って、ブローノズル１０からの空気の吹き込みを停止
した後、金型７Ａ，８Ａを開型し、ブローノズル１０を
フィラーチューブ２から引き抜くとともに、上記冷却固
化された燃料タンクを金型７Ａ，８Ａから離型する。こ
れにより、図５に示すタンク本体１と単数のフィラーチ
ューブ２とからなる燃料タンクを成形するブロー成形の
１サイクルが終了する。Next, after the formed fuel tank is cooled and solidified, the blowing of air from the blow nozzle 10 is stopped, and then the molds 7A and 8A are opened, and the blow nozzle 10 is pulled out of the filler tube 2. At the same time, the cooled and solidified fuel tank is released from the molds 7A and 8A. Thereby, one cycle of the blow molding for molding the fuel tank including the tank body 1 and the single filler tube 2 shown in FIG. 5 is completed.

【００１４】なお、本発明は、前記実施例に限定される
ものではなく、図示は省略するが、例えば、切り込み１
５を入れる線状部材１３を適当な温度に加熱したり、線
状部材１３の代わりにレーザ光のような光エネルギーを
利用して切り込み１５を入れることも可能である。ま
た、切り込み１５を入れる時期は、パリソンＰのドロー
ダウンから金型７Ａ，８Ａの型閉め開始までの間であれ
ば適用できる。The present invention is not limited to the above-described embodiment.
It is also possible to heat the linear member 13 in which 5 is inserted to an appropriate temperature, or to make the cut 15 using light energy such as laser light instead of the linear member 13. The cut 15 can be made as long as it is between the drawdown of the parison P and the start of closing the molds 7A and 8A.

【００１５】また、金型７Ａ，８Ａにパイプ形成部５，
６を複数設けることより、図６に示すように、タンク本
体１に複数のフィラーチューブ２を有する燃料タンクを
成形することも可能である。この場合、図６に仮想線で
示すように、複数のフィラーチューブ２を互いに逆向き
に延長しても良い。さらに、パリソンＰに切り込み１５
を複数本入れることも可能である。Further, pipe forming portions 5, 5 are provided on the molds 7A, 8A.
By providing a plurality of the fuel tanks 6, it is also possible to form a fuel tank having a plurality of filler tubes 2 in the tank body 1, as shown in FIG. In this case, as shown by a virtual line in FIG. 6, the plurality of filler tubes 2 may be extended in mutually opposite directions. Furthermore, cut 15 in parison P
It is also possible to put a plurality of.

【００１６】[0016]

【発明の効果】以上のように本発明によれば、ドローダ
ウンするパリソンの金型による挟み込み開始までの間
に、パリソンの金型による挟み込みに伴って成形品本体
形成部と膨出部との間で薄肉となる部分に、ドローダウ
ン方向に沿った切り込みを入れるので、金型でパリソン
を挟み込んでパリソン内部を完全密封する過程におい
て、金型の中空成形品形成部と膨出部との間に位置する
パリソンの部分が引っ張られて薄肉となることなく、パ
リソンの切り込みで分割された中空成形品本体部分と別
部材それぞれが金型の中空成形品本体形成部と膨出部と
に対応配置され、成形品本体とこれから延長される別部
材とを有する肉厚さの均一な成形品を得ることができ、
もってブロー成形の歩留まりも良くなり、コストダウン
も図れる。As described above, according to the present invention, the molded article main body forming portion and the bulging portion are caused by the parison being pinched by the mold before the drawdown of the parison is pinched by the die. Since a cut is made along the drawdown direction in the part that becomes thinner between the parts, in the process of sandwiching the parison with the mold and completely sealing the inside of the parison, the gap between the hollow molded product forming part of the mold and the bulging part The part of the parison that is located at is not pulled down and becomes thinner, and the hollow molded product main part divided by the parison cut and the separate members are arranged corresponding to the hollow molded product main body forming part and the bulging part of the mold It is possible to obtain a molded article having a uniform thickness having a molded article body and another member extended therefrom,
As a result, the yield of blow molding is improved, and the cost can be reduced.

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

【図１】本発明の一実施例のブロー成形法を説明するた
めの斜視図。FIG. 1 is a perspective view for explaining a blow molding method according to one embodiment of the present invention.

【図２】同一実施例のパリソンに切り込みが入った状態
を示す斜視図。FIG. 2 is a perspective view showing a state in which the parison of the embodiment is cut.

【図３】従来のブロー成形法を説明するための斜視図。FIG. 3 is a perspective view for explaining a conventional blow molding method.

【図４】同従来例の作用説明図。FIG. 4 is an operation explanatory view of the conventional example.

【図５】ブロー成形された燃料タンクを示す斜視図。FIG. 5 is a perspective view showing a blow-molded fuel tank.

【図６】ブロー成形された燃料タンクを示す斜視図。FIG. 6 is a perspective view showing a blow-molded fuel tank.

【符号の説明】[Explanation of symbols]

１…タンク本体（中空成形品本体） ２…フィラーチューブ（別部材） ３，４…タンク本体形成部（中空成形品本体形成部） ５，６…パイプ形成部（膨出部） ７Ａ，８Ａ…金型 １３…線状部材 １５…切り込み Ｐ…パリソン DESCRIPTION OF SYMBOLS 1 ... Tank main body (hollow molded product main body) 2 ... Filler tube (separate member) 3, 4 ... Tank main body forming part (hollow molded product main body forming part) 5, 6 ... Pipe forming part (bulging part) 7A, 8A ... Mold 13: Linear member 15: Notch P: Parison

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 中空成形品本体形成部とこの中空成形品
本体形成部から型閉め方向に膨出された膨出部とを有す
る左右一対の金型間に、予備成形されたパリソンをドロ
ーダウンし、このパリソンの内部にエクスパンダノズル
とブローノズルとを挿入し、このパリソンを前記一対の
金型により挟み込んで、パリソン内部を完全密封とした
上で、ブローノズルからパリソン内部に空気を吹き込む
ことにより、中空成形品本体とこの中空成形品本体から
延長する別部材とを一体成形するブロー成形法におい
て、前記ドローダウンするパリソンの金型による挟み込
み開始までの間に、前記パリソンの金型による挟み込み
に伴って成形品本体形成部と膨出部との間で薄肉となる
部分に、ドローダウン方向に沿った切り込みを入れるこ
とを特徴とするブロー成形法。1. A preformed parison is drawn down between a pair of left and right molds having a hollow molded article main body forming part and a bulging part bulging from the hollow molded article main body forming part in a mold closing direction. Then, an expander nozzle and a blow nozzle are inserted into the inside of the parison, the parison is sandwiched between the pair of molds, and the inside of the parison is completely sealed, and air is blown into the inside of the parison from the blow nozzle. Thus, in the blow molding method for integrally molding the hollow molded article main body and another member extending from the hollow molded article main body, the parison is sandwiched by the mold until the start of the sandwiching of the parison to be drawn down by the mold. Characterized in that a cut is made along the drawdown direction in a thin portion between the molded article main body forming portion and the bulging portion in accordance with Molding method.
JP3009586A 1991-01-30 1991-01-30 Blow molding method Expired - Lifetime JP2658590B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3009586A JP2658590B2 (en) 1991-01-30 1991-01-30 Blow molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3009586A JP2658590B2 (en) 1991-01-30 1991-01-30 Blow molding method

Publications (2)

Publication Number Publication Date
JPH04244828A JPH04244828A (en) 1992-09-01
JP2658590B2 true JP2658590B2 (en) 1997-09-30

Family

ID=11724429

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3009586A Expired - Lifetime JP2658590B2 (en) 1991-01-30 1991-01-30 Blow molding method

Country Status (1)

Country Link
JP (1) JP2658590B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1013191A3 (en) 1999-12-22 2001-10-02 Solvay Method for producing hollow plastic material.

Also Published As

Publication number Publication date
JPH04244828A (en) 1992-09-01

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