JPH0725129B2 - Blow molding method - Google Patents
Blow molding methodInfo
- Publication number
- JPH0725129B2 JPH0725129B2 JP63075304A JP7530488A JPH0725129B2 JP H0725129 B2 JPH0725129 B2 JP H0725129B2 JP 63075304 A JP63075304 A JP 63075304A JP 7530488 A JP7530488 A JP 7530488A JP H0725129 B2 JPH0725129 B2 JP H0725129B2
- Authority
- JP
- Japan
- Prior art keywords
- parison
- die
- molding
- molding die
- guide member
- 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
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
- B29C49/4242—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
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
- B29C2049/4805—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity by closing the mould halves
-
- 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
- B29C49/42452—The mould opening plane being horizontal
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】 産業上の利用分野 本発明は、ドーナツ形の中空樹脂成形品の成形を目的と
したブロー成形法に関する。TECHNICAL FIELD The present invention relates to a blow molding method for molding a donut-shaped hollow resin molded product.
従来の技術 ブロー成形は、例えば昭和53年５月30日，日刊工業新聞
社発行「プラスチック成形加工入門」第71頁に示されて
いるように、割型構成した左右一対の成形型をブロー成
形機のパリソン射出方向と直交する横方向に相対峙して
配置し、ブロー成形機のダイ（口金）からパリソンを型
開きした左右一対の成形型間に射出し、左右一対の成形
型を型締めするとともにダイからパリソン内に空気を吹
き込んで、パリソンを膨張させて成形型の製品空間部壁
面に押さえつけて冷却固化させる成形法である。Conventional technology Blow molding is, for example, blow molding of a pair of left and right molding dies configured as split molds, as shown on page 71 of "Introduction to plastic molding" issued by Nikkan Kogyo Shimbun on May 30, 1978. The parison of the machine is placed in the transverse direction orthogonal to the injection direction, and the parison is injected from the die of the blow molding machine between the pair of left and right molds opened, and the pair of left and right molds is clamped. At the same time, air is blown into the parison from the die to expand the parison and press it against the wall of the product space of the molding die to cool and solidify it.
ところで、自動車部品のうちでブロー成形品としての燃
料タンクの中には、設置場所の関係から第12,13図に示
すように、タンク本体１に中抜孔２を設け、この中抜孔
２に配管のような機能部品を通すというように、中抜孔
２を他の機能部品の設置に利用するようにした形状のも
のがある。By the way, in the fuel tank as a blow molded product among the automobile parts, as shown in FIGS. 12 and 13, a hollow hole 2 is provided in the tank body 1 due to the installation location, and a pipe is provided in the hollow hole 2. There is a shape in which the hollow hole 2 is used for installing other functional components such as through such functional components.
発明が解決しようとする課題 前述の中抜孔２を有する燃料タンクのように、所謂ドー
ナツ形の中空樹脂成形品をブロー成形するには、左右一
対の成形型の型締め方向がブロー成形機のパリソン射出
方向と直交する横方向であるので、第11図に示すように
タンク本体１の内側と外側とにバリ3,4を有する一次成
形品５を図外のパリソンからブロー成形し、この一次成
形品５のバリ3,4を第11図に一点鎖線で示すラインl1,l2
で切除し、第12,13図に示す完成品を得ている。このた
め、タンク本体１の内外２ケ所のバリ3,4を除去するこ
とから、その作業が面倒であった。また、第12,13図に
示す完成品についてみると、内外のピンチオフ部6,7は
重合面が互いに溶着しているので、その結合度合の弱い
所が存在して強度むらを生じ易い。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In blow molding a so-called doughnut-shaped hollow resin molded product such as the fuel tank having the hollow hole 2 described above, the pair of left and right molds are clamped in a parison of a blow molding machine. Since it is a transverse direction orthogonal to the injection direction, a primary molded product 5 having burrs 3 and 4 on the inside and outside of the tank body 1 as shown in FIG. 11 is blow molded from a parison outside the drawing, and this primary molding is performed. Lines l 1 and l 2 indicated by the alternate long and short dash line in FIG. 11 for burrs 3 and 4 of product 5
It was excised at to obtain the finished product shown in Figs. For this reason, since the burrs 3 and 4 at two places inside and outside the tank body 1 are removed, the work is troublesome. Further, regarding the finished product shown in FIGS. 12 and 13, since the inner and outer pinch-off portions 6 and 7 have their superposed surfaces welded to each other, there are places where the bonding degree is weak and uneven strength is likely to occur.
そこで本発明は作業性と品質信頼性とを向上することが
できるブロー成形法を提供するものである。Therefore, the present invention provides a blow molding method capable of improving workability and quality reliability.
課題を解決するための手段 本願発明は、成形上型と成形下型とをブロー成形機のパ
リソン射出方向に相対峙して配置し、ブロー成形機のダ
イからパリソンを成形上型の中央を通して成形下型に向
けて射出するとともに、この射出されたパリソンを成形
下型に上下動可能に設けられたガイド部材で案内したが
ら該パリソンの下縁を成形下型に着地させ、パリソンの
下縁が成形下型に着地した後に、ガイド部材を下降させ
てその成形下型とガイド部材との間にパリソンの下縁を
クランプするとともに、ダイからパリソン内に空気を吹
き込みながら成形上型と成形下型とをパリソンの射出方
向と同方向に型締めしてドーナツ形の中空樹脂成形品を
成形する。MEANS FOR SOLVING THE PROBLEMS The present invention has a molding upper die and a molding lower die which are arranged relatively in the parison injection direction of a blow molding machine, and a parison is molded from a die of a blow molding machine through the center of the molding upper die. While injecting toward the lower mold, the injected parison is guided by a guide member that is vertically movable in the molding lower mold, and the lower edge of the parison is landed on the molding lower mold so that the lower edge of the parison is After landing on the lower molding die, lower the guide member to clamp the lower edge of the parison between the lower molding die and the guide member, and blow air into the parison from the die to form the upper molding die and the lower molding die. And are clamped in the same direction as the injection direction of the parison to form a donut-shaped hollow resin molded product.
実施例 以下、本発明の実施例を図面にもとづいて詳述する。Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
第１実施例（第１〜７図参照） 先ず、第１図に示すように、割型構成した成形上型10と
成形下型11とをブロー成形機の矢印Ｘで示すパリソン射
出方向に相対峙して配置する。この開型状態において、
ブロー成形機のダイ12は成形上型10の製品空間用凹部13
よりも内側の略中央部に上下方向に貫設した挿通孔14に
嵌装させてある。First Embodiment (Refer to FIGS. 1 to 7) First, as shown in FIG. 1, a molding upper mold 10 and a molding lower mold 11 which are split molds are aligned in a parison injection direction indicated by an arrow X of a blow molding machine. Place them facing each other. In this open state,
The die 12 of the blow molding machine is a recess 13 for the product space of the upper molding die 10.
It is fitted in an insertion hole 14 which is vertically provided so as to penetrate in a substantially central portion on the inner side.
そして、上端に爪30を形成した複数本のガイド部材31を
成形下型11に上下動可能に組み付けてある。これらのガ
イド部材31は、成形下型11の製品空間用凹部17よりも内
側部分に周方向に離間して、爪30が軸心に向けて上動す
るように、斜めに上下動する構造になっている。また、
これらのガイド部材31は図外のシリンダのようなアクチ
ュエータにより、成形下型11に対して上下動されるとと
もに、成形下型11と同期して上下動されるようにもなっ
ている。Then, a plurality of guide members 31 having claws 30 formed on the upper end are assembled to the lower molding die 11 so as to be vertically movable. These guide members 31 are separated from each other in the inner side of the product space recess 17 of the lower molding die 11 in the circumferential direction, and have a structure in which they move up and down diagonally so that the claw 30 moves upward toward the axis. Has become. Also,
These guide members 31 are moved up and down with respect to the lower molding die 11 by an actuator such as a cylinder (not shown), and are also moved up and down in synchronization with the lower molding die 11.
次に、前述の開型状態のままで、パリソン16の射出前に
第１図に示すようにガイド部材31を成形下型11からダイ
12側へ向けて突出させ、爪30をダイ12の成形材料噴出口
15の内側近傍に配置させておく。Next, in the open state as described above, before the parison 16 is injected, the guide member 31 is moved from the lower molding die 11 to the die as shown in FIG.
12 toward the 12 side, the claw 30 ejects the molding material of the die 12
Place it near the inside of 15.
この後、第２図に示すように、ダイ12の成形材料噴出口
15からパリソン16を成形上型10を通して成形下型11に向
けて射出し、パリソン16の下縁を成形下型11の製品空間
用凹部17よりも内側部分に着地させる。After this, as shown in FIG. 2, the molding material ejection port of the die 12
The parison 16 is injected from 15 through the upper molding die 10 toward the lower molding die 11, and the lower edge of the parison 16 is landed on the inner side of the product space recess 17 of the lower molding die 11.
このとき、パリソン16の径はパリソン16の射出圧によっ
てコントロールされる一方、パリソン16の下縁がガイド
部材31の斜めになった外側面に案内されながら下動して
成形下型11に着地する。。At this time, the diameter of the parison 16 is controlled by the injection pressure of the parison 16, while the lower edge of the parison 16 is guided downward by the slanted outer surface of the guide member 31 to land on the lower molding die 11. . .
さらに、第３図に示すようにガイド部材31を下動させ、
パリソン16の下縁を爪30と成形下型11とで挟持し、この
挟持を維持したまま第3,4図に示すように、ダイ12のエ
ア噴出孔18から空気19をパリソン16内に吹き込みなが
ら、成形上型10と成形下型11とをパリソン16の射出方向
Ｘと同方向に型締めをする。Further, as shown in FIG. 3, the guide member 31 is moved downward,
The lower edge of the parison 16 is clamped by the claw 30 and the lower molding die 11, and air 19 is blown into the parison 16 from the air ejection holes 18 of the die 12 while maintaining this clamping as shown in FIGS. Meanwhile, the upper mold 10 and the lower mold 11 are clamped in the same direction as the injection direction X of the parison 16.
ここで、この実施例における型締めに際しては、第３図
に矢印Ｙで示すように、ダイ12と成形上型10とを静止し
たまま、成形下型11をパリソン16の射出方向Ｘと同方向
で逆向きに上動して型締めを行っている。また、型締め
の過程において、パリソン16がその内部に吹き込まれた
空気19と成形下型11の上動とによって第3,4図に示すよ
うに外側に膨張し、成形上型10の製品空間用凹部13と成
形下型11の製品空間用凹部17とによって隔成される製品
空間部20内にかかえ込まれるのであるが、このとき、膨
張したパリソン16の外側部分が製品空間部20よりも外側
に膨出して外側ピンチオフ部が形成されないように、パ
リソン16を構成する成形材料の噴出量と空気19の吹き出
し量とをコントロールする。Here, at the time of mold clamping in this embodiment, as shown by an arrow Y in FIG. 3, the molding lower mold 11 is moved in the same direction as the injection direction X of the parison 16 while keeping the die 12 and the molding upper mold 10 stationary. And moving upward in the opposite direction to perform mold clamping. Further, in the process of mold clamping, the parison 16 expands outward as shown in FIGS. 3 and 4 by the air 19 blown into the parison 16 and the upward movement of the molding lower mold 11, and the product space of the molding upper mold 10. It is held in the product space 20 defined by the product recess 13 and the product space recess 17 of the lower molding die 11. At this time, the outer part of the expanded parison 16 is more than the product space 20. The ejection amount of the molding material forming the parison 16 and the ejection amount of the air 19 are controlled so as to prevent the outer pinch-off portion from being bulged outward.
また、第４図に示すように成形上型10と成形下型11とが
全閉した状態において、仮想線で示すように製品空間部
20内にかかえ込まれたパリソン16内に、成形上型10と成
形下型11との外側よりピン21を差し込んで図外の貫通孔
を形成して前述とは別の空気を吹き込んで、パリソン16
を製品空間部20の壁面に押し付けるとともに固化させて
もよい。なお、前期貫通孔は成形品を燃料タンクに構成
する場合には、フィーラチューブ連結用孔に使用するの
で、第４図示以外の部位に形成されることもある。Further, as shown in FIG. 4, when the upper molding die 10 and the lower molding die 11 are fully closed, the product space portion is indicated by a phantom line.
Insert the pin 21 from the outside of the upper molding die 10 and the lower molding die 11 into the parison 16 held in the inside 20 to form a through hole (not shown) and blow air different from the above to 16
May be pressed against the wall surface of the product space portion 20 and solidified. Since the through holes are used as the feeler tube connecting holes when the molded product is formed into a fuel tank, they may be formed in a portion other than the fourth drawing.
そして、前述のように型締めしてパリソン16が固化した
後に、成形下型11を下動させて、開型を行い、ダイ12よ
り第５図に示す一次成形品22を取り出し、この一次成形
品22の中抜き孔側のバリ23を第５図の一点鎖線で示すラ
インl3で切除し、第6,7図に示すように中抜き孔２を有
するドーナツ形の中空樹脂成形品としての完成品24を得
る。After the parison 16 is solidified by the mold clamping as described above, the lower molding die 11 is moved downward to open the die, and the primary molded product 22 shown in FIG. The burr 23 on the side of the hollow hole of the product 22 is cut off along the line l 3 shown by the alternate long and short dash line in FIG. 5 to form a donut-shaped hollow resin molded product having the hollow hole 2 as shown in FIGS. Obtain the finished product 24.
以上の実施例によれば、第4,5図から明らかなように成
形時に外側のバリが出ないようにすることができるの
で、一次成形品22でのバリ取り作業が容易になる。しか
も完成品24の外壁部はピンチオフ部が存在しないでパリ
ソン16そのままで形成されているので、溶着による強度
むらも生じることはない。According to the above-described embodiment, it is possible to prevent the outer burrs from coming out during the molding as is clear from FIGS. 4 and 5, so that the deburring work of the primary molded product 22 becomes easy. Moreover, since the outer wall portion of the finished product 24 is formed by the parison 16 as it is without any pinch-off portion, uneven strength due to welding does not occur.
また、この実施例によれば、ダイ12から射出されるパリ
ソン16をガイド部材31で案内するので、パリソン16下縁
が成形下型11に着地する場所を常に正確なものとするこ
とができる。しかもパリソン16下縁を爪30と成形下型11
とで複数点挟持するので、ダイ12からパリソン16内に吹
き込まれた空気19がパリソン16下縁と成形下型11の重合
面間から逃げる割合を低減することができる。Further, according to this embodiment, since the parison 16 ejected from the die 12 is guided by the guide member 31, the place where the lower edge of the parison 16 lands on the lower molding die 11 can always be accurate. Moreover, the lower edge of the parison 16 is the nail 30 and the molding lower mold 11
Since a plurality of points are sandwiched by and, it is possible to reduce the rate at which the air 19 blown from the die 12 into the parison 16 escapes from between the lower edge of the parison 16 and the overlapping surface of the lower molding die 11.
第２実施例（第8,9図） 第8,9図に示すように、上端に板状の爪体40を有するガ
イド部材41を、成形下型11の製品空間用凹部17よりも内
側部分に上下動可能に組み付けてある。このガイド部材
41は、図外のシリンダのようなアクチュエータにより、
成形下型11に対して上下動されるとともに、成形下型11
と同期して上下動されるようにもなっている。Second Embodiment (FIGS. 8 and 9) As shown in FIGS. 8 and 9, a guide member 41 having a plate-like claw 40 at the upper end is provided inside the product space recess 17 of the lower molding die 11. It is mounted so that it can move up and down. This guide member
41 is a cylinder-like actuator (not shown)
The lower mold 11 is moved up and down with respect to the lower mold 11.
It is also designed to be moved up and down in synchronization with.
この実施例によれば、ガイド部材41を前述の第１実施例
と同様に作動させ、成形下型11に着地したパリソン16の
下縁全周を爪体40と成形下型11とで挟持して、ダイ12か
らパリソン16内に吹き込まれた空気19がパリソン16下縁
と成形下型11との重合面間から逃げる割合をより一層低
減させることができる。According to this embodiment, the guide member 41 is operated in the same manner as in the first embodiment described above, and the entire lower edge of the parison 16 landed on the lower molding die 11 is clamped by the claw 40 and the lower molding die 11. Thus, the rate at which the air 19 blown into the parison 16 from the die 12 escapes from between the overlapping surfaces of the lower edge of the parison 16 and the lower molding die 11 can be further reduced.
第３実施例（第10図参照） 第10図に示すように、成形下型11の製品空間用凹部17の
内周に沿って周方向へ離間配置する複数本のガイド部材
50は、前述の第１実施例と同様に、成形下型11に斜めに
上下動可能に組み付けてあり、図外のアクチュエータに
より、成形下型11に対して上下動されるとともに、成形
下型11と同期して上下動されるようにもなっている。複
数本のガイド部材50の上端には単板状の爪体51を長穴52
とピン53とで連結してある。爪体51は、成形下型11の成
形空間用凹部17の内径よりも小さな相似形に形成されて
いる。Third Embodiment (Refer to FIG. 10) As shown in FIG. 10, a plurality of guide members circumferentially spaced along the inner circumference of the product space recess 17 of the lower molding die 11.
Like the above-described first embodiment, 50 is obliquely assembled to the lower molding die 11 so as to be vertically movable, and is moved up and down with respect to the lower molding die 11 by an actuator (not shown). It is also designed to move up and down in synchronization with 11. A single plate-shaped claw body 51 is provided at the upper end of the plurality of guide members 50 with an elongated hole 52.
It is connected with the pin 53. The claw body 51 is formed in a similar shape smaller than the inner diameter of the molding space recess 17 of the lower molding die 11.
この実施例によれば、ダイ12から射出されるパリソン16
をガイド部材50で案内して、パリソン16下縁が成形下型
11に着地する場所を正確なものとすることができるとと
もに、成形下型11に着地したパリソン16の下縁全周を爪
体51と成形下型11とで挟持して、パリソン16内に吹き込
まれた空気19の逃げを抑えることもできる。According to this embodiment, the parison 16 ejected from the die 12
Guide member 50 to guide the lower edge of parison 16
The location of landing on 11 can be made precise, and the entire lower edge of the parison 16 landed on the molding lower die 11 is sandwiched between the claw 51 and the molding lower die 11 and blown into the parison 16. It is also possible to suppress the escape of the trapped air 19.
発明の効果 以上のように本発明によれば、型締め時にパリソンの外
形が成形上型と成形下型との製品空間部よりも外側に膨
張しないようにコントロールすることによって、一次成
形品の外側にバリが発生するのを省略することができ
る。この結果、一次成形品からドーナツ形の完成品を得
るに際して、内側のバリだけを除去すればよいので、バ
リ除去作業が容易になり、しかも、完成品にあっては、
ピンチオフ部が内側にだけしか存在しないので、その品
質信頼性をも向上させることができる。EFFECTS OF THE INVENTION As described above, according to the present invention, by controlling the outer shape of the parison so that it does not expand outside the product space between the upper molding die and the lower molding die during mold clamping, the outside of the primary molded product is controlled. Burr can be omitted. As a result, when obtaining a doughnut-shaped finished product from the primary molded product, it is only necessary to remove the burrs on the inner side, which facilitates the burr removal work and, in the finished product,
Since the pinch-off portion exists only inside, it is possible to improve the quality reliability.
また、射出されたパリソンをガイド部材で案内するとと
もに、そのパリソンの下縁を成形下型上において該成形
下型とガイド部材とで挾持してクランプすることによ
り、下型上でのパリソンの姿勢および位置が安定化して
成形品質が向上するのと併せて、バリとなる領域が少な
くなって材料歩留りよくなるという効果がある。In addition, the injected parison is guided by a guide member, and the lower edge of the parison is clamped by the lower molding die and the guide member on the lower molding die to clamp the parison. Further, the position is stabilized and the molding quality is improved, and at the same time, there is an effect that the region which becomes a burr is reduced and the material yield is improved.
第１図は本発明の第１実施例の開型状態を示す断面図、
第２図は同第１実施例のパリソンが成形下型に着地した
状態を示す断面図、第３図は同第１実施例の型締め途中
を示す断面図、第４図は同第１実施例の全閉状態を示す
断面図、第５図は同第１実施例の一次成形品を示す斜視
図、第６図は同第１実施例の完成品を示す斜視図、第７
図は第６図に示すVII−VII線断面図、第８図は本発明の
第２実施例のパリソンが成形下型に着地した状態を示す
断面図、第９図は同第２実施例の型締め途中を示す断面
図、第10図は本発明の第３実施例のパリソンが成形下型
に着地した状態を示す断面図、第11図は従来のブロー成
形による一次成形品を示す斜視図、第12図は同従来の完
成品を示す斜視図、第13図は第12図に示すXV−XV線断面
図である。 10……成形上型、11……成形下型、12……ダイ、16……
パリソン、19……空気、31,41,50……ガイド部材、Ｘ…
…射出方向、Ｙ……型締め方向。FIG. 1 is a sectional view showing a first embodiment of the present invention in an open mold state,
FIG. 2 is a sectional view showing a state in which the parison of the first embodiment is landed on the lower molding die, FIG. 3 is a sectional view showing the mold clamping process of the first embodiment, and FIG. 4 is the first embodiment. FIG. 5 is a sectional view showing a fully closed state of the example, FIG. 5 is a perspective view showing a primary molded product of the first embodiment, and FIG. 6 is a perspective view showing a finished product of the first embodiment.
FIG. 7 is a sectional view taken along line VII-VII shown in FIG. 6, FIG. 8 is a sectional view showing a state in which the parison of the second embodiment of the present invention has landed on the lower molding die, and FIG. 9 is a sectional view of the second embodiment. FIG. 10 is a sectional view showing the middle of mold clamping, FIG. 10 is a sectional view showing a state in which the parison of the third embodiment of the present invention has landed on the lower molding die, and FIG. 11 is a perspective view showing a primary molded product by conventional blow molding. FIG. 12 is a perspective view showing the conventional finished product, and FIG. 13 is a sectional view taken along line XV-XV shown in FIG. 10 …… Molding upper mold, 11 …… Molding lower mold, 12 …… Die, 16 ……
Parison, 19 ... Air, 31,41,50 ... Guide member, X ...
… Injection direction, Y… Mold clamping direction.
Claims (1)
リソン射出方向に相対峙して配置し、 ブロー成形機のダイからパリソンを成形上型の中央を通
して成形下型に向けて射出するとともに、この射出され
たパリソンを成形下型に上下動可能に設けられたガイド
部材で案内しながら該パリソンの下縁を成形下型に着地
させ、 パリソンの下縁が成形下型に着地した後に、ガイド部材
を下降させてその成形下型とガイド部材との間にパリソ
ンの下縁をクランプするとともに、ダイからパリソン内
に空気を吹き込みながら成形上型と成形下型とをパリソ
ンの射出方向と同方向に型締めしてドーナツ形の中空樹
脂成形品を成形することを特徴とするブロー成形法。1. A molding upper die and a molding lower die are arranged relative to each other in a parison injection direction of a blow molding machine, and a parison is injected from a die of the blow molding machine through a center of the molding upper die toward a molding lower die. The lower edge of the parison is landed on the lower molding die while guiding the injected parison with the guide member that is vertically movable on the lower molding die, and the lower edge of the parison is landed on the lower molding die. After that, the guide member is lowered to clamp the lower edge of the parison between the lower molding die and the guide member, and the upper molding die and the lower molding die are blown into the parison while the air is blown into the parison from the die. The blow molding method is characterized in that a donut-shaped hollow resin molded product is molded by clamping in the same direction as.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63075304A JPH0725129B2 (en) | 1988-03-29 | 1988-03-29 | Blow molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63075304A JPH0725129B2 (en) | 1988-03-29 | 1988-03-29 | Blow molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01247134A JPH01247134A (en) | 1989-10-03 |
| JPH0725129B2 true JPH0725129B2 (en) | 1995-03-22 |
Family
ID=13572381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63075304A Expired - Lifetime JPH0725129B2 (en) | 1988-03-29 | 1988-03-29 | Blow molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0725129B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6916167B2 (en) * | 2001-08-13 | 2005-07-12 | David Johnson | Method and apparatus for extrusion blow molding of shapes with an even wall thickness and varying radii |
| CN106346754A (en) * | 2016-09-07 | 2017-01-25 | 深圳市捷创新材料有限公司 | Base product extrusion blow molding process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5845335B2 (en) * | 1976-07-27 | 1983-10-08 | キヨ−ラク株式会社 | Manufacturing method of circular hollow product |
-
1988
- 1988-03-29 JP JP63075304A patent/JPH0725129B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01247134A (en) | 1989-10-03 |
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