JPH0549018B2 - - Google Patents
Info
- Publication number
- JPH0549018B2 JPH0549018B2 JP63051008A JP5100888A JPH0549018B2 JP H0549018 B2 JPH0549018 B2 JP H0549018B2 JP 63051008 A JP63051008 A JP 63051008A JP 5100888 A JP5100888 A JP 5100888A JP H0549018 B2 JPH0549018 B2 JP H0549018B2
- Authority
- JP
- Japan
- Prior art keywords
- parison
- guide piece
- convex portion
- mold
- side wall
- 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
- 238000000071 blow moulding Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 description 11
- 210000004209 hair Anatomy 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
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
- B29C49/48—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
- B29C49/02—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
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、偏肉防止機構を備えたブロー成形装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a blow molding apparatus equipped with a thickness unevenness prevention mechanism.
（従来の技術）
一般に、第６図に示すような中空合成樹脂の成
形品１、すなわち、側壁２に凸状部３を有するも
のはブロー成形によつて形成することが多い。こ
の場合、ブロー成形装置としては、第７図に示す
ように、金型５の上記側壁２を形成するキヤビテ
イ面６に凹状部７を形成し、パリソン８の膨張に
ともない凹状部７によつて成形品１の凸状部３を
形成している。この際、パリソン８は金型５の型
閉時または初期膨張時に側壁２用のキヤビテイ面
６に接触して、凹状部７に対する部分８ａが浮い
た状態となり、この浮いた部分８ａがパリソン８
内へのエアブローＰによつて凹状部７に沿つて延
び、凸状部３となる。(Prior Art) Generally, a hollow synthetic resin molded article 1 as shown in FIG. 6, that is, one having a convex portion 3 on the side wall 2, is often formed by blow molding. In this case, as shown in FIG. 7, the blow molding apparatus has a concave portion 7 formed in the cavity surface 6 forming the side wall 2 of the mold 5, and as the parison 8 expands, the concave portion 7 The convex portion 3 of the molded product 1 is formed. At this time, the parison 8 comes into contact with the cavity surface 6 for the side wall 2 when the mold 5 closes or initially expands, and the part 8a relative to the recessed part 7 is in a floating state, and this floating part 8a is the part of the parison 8.
Due to the inward air blow P, it extends along the concave portion 7 and becomes the convex portion 3 .
この場合、パリソン８はエアブローによつて膨
張して部分８ａが流さＸから長さＹに伸張するこ
とにより、部分８ａの肉厚ａが肉厚ｂとなり、す
なわち、ａ＞ｂとなつて成形品１に偏肉を生じ
る。 In this case, the parison 8 is expanded by air blowing, and the portion 8a extends from the flow X to the length Y, so that the wall thickness a of the portion 8a becomes the wall thickness b, that is, a>b, and the molded product 1 causes uneven thickness.
このようなことから、たとえば、特公昭56−
13609号公報に示されるように、予備成形型と本
成形型とを用い、まず、予備成形型により、成形
品の外方への凸状部となる部分を反対に内方への
凹状部として成形し、ついで、本成形型により、
エアブローとともに内方への凹状部でもつて外方
への凸状部を成形し、凸状部に偏肉が生じるのを
防止する成形方法が提案されている。 For this reason, for example,
As shown in Publication No. 13609, using a preforming mold and a main mold, first, the part of the molded product that will become an outward convex part is turned into an inward concave part by using the preforming mold. Molding, then using the main mold,
A molding method has been proposed in which an outward convex portion is formed using an inward concave portion along with air blowing to prevent uneven thickness from occurring in the convex portion.
しかし、この成形方法によると、成形品の凸状
部の偏肉防止のため、予備成形を行なわなければ
ならず、設備、工数が多くなつてコスト高とな
る。 However, according to this molding method, in order to prevent uneven thickness of the convex portion of the molded product, preliminary molding must be performed, which increases equipment and man-hours, resulting in high costs.
また、特公昭61−48412号公報に示されるよう
に、成形品の凸状部を形成する凹状部を有する成
形型において、その内面のパリソン初期当接部位
に弾性細毛を有する断熱材を設け、パリソンの壁
部を弾性細毛に当接させて、成形品の凸状部への
パリソンの移動をスムーズに行なわせ、偏肉を防
止するようにした成形方法も知られている。 Furthermore, as shown in Japanese Patent Publication No. 61-48412, in a mold having a concave portion forming a convex portion of a molded product, a heat insulating material having elastic fine hairs is provided at the initial contact portion of the parison on the inner surface thereof, A molding method is also known in which the walls of the parison are brought into contact with elastic hairs to smoothly move the parison to the convex portion of the molded product, thereby preventing uneven thickness.
しかし、この成形方法によると、パリソンは弾
性細毛に当接していて、エアブロー圧は弾性細毛
の植設方向にもかかるので、パリソンの大きな移
動は期待できず、また、成形品の表面に細毛跡が
形成され、成形品の表面を損なうことがある。 However, according to this molding method, the parison is in contact with the elastic fine hairs, and the air blow pressure is also applied in the direction in which the elastic hairs are planted, so large movements of the parison cannot be expected, and there are no traces of fine hairs on the surface of the molded product. may be formed and damage the surface of the molded product.
（発明が解決しようとする課題）
上記のように、従来の成形方法によると、な
お、設備、仕上り等に問題がある。(Problems to be Solved by the Invention) As described above, the conventional molding method still has problems with equipment, finishing, etc.
本発明は、金型に比較的簡単な偏肉防止機構を
設けることにより、凸状部において偏肉のない、
かつ、仕上りのよい成形品を得ることができるよ
うにすることを目的とするものである。 The present invention provides a mold with a relatively simple thickness unevenness prevention mechanism, thereby eliminating uneven thickness in the convex portion.
Moreover, it is an object of the present invention to make it possible to obtain a molded product with a good finish.
（課題を解決するための手段）
本発明は、側壁に凸状部を有する成形品をブロ
ー成形により形成するブロー成形装置であつて、
上記成形品の側壁を形成するキヤビテイ面に上記
凸状部を形成する凹状部を設けた金型と、上記凹
状部の縁部に出没自在に設けられ、キヤビテイ内
方に突出してパリソンの膨張時に上記側壁を形成
するキヤビテイ面より先にパリソンが接触すると
ともに上記凸状部を形成する凹状部へのパリソン
の侵入時に後退するガイド片とを備えたものであ
る。
(Means for Solving the Problems) The present invention is a blow molding apparatus for forming a molded product having a convex portion on a side wall by blow molding,
A mold is provided with a concave part forming the convex part on the cavity surface forming the side wall of the molded product, and a mold is provided on the edge of the concave part so as to be freely protrusive and retractable, and protrudes inward of the cavity when the parison expands. The guide piece is provided with a guide piece that the parison comes into contact with before the cavity surface forming the side wall and that retreats when the parison enters the concave portion forming the convex portion.
（作用）
本発明では、成形にあたつては、金型１１を型
開きし、かつ、各ガイド片２１をキヤビテイ内方
に突出させておく。(Function) In the present invention, during molding, the mold 11 is opened and each guide piece 21 is made to protrude inward from the cavity.
そして、パリソン１８を金型１１内に吐出し、
金型１１を型閉してパリソン１８の上下端部を挾
持し、パリソン１８内にエアブローしてパリソン
１８を膨張させる。この型閉時またはパリソン１
８の初期膨張時に、パリソン１８の凹状部１６に
対する部分１８ａでは、パリソン１８が側壁２の
キヤビテイ面１４に接触するより先に各ガイド片
２１の先端に接触係止され、この各ガイド片２１
の先端間に係止されたパリソン１８の部分１８ａ
は十分に大きい長さX1に設定される。 Then, the parison 18 is discharged into the mold 11,
The mold 11 is closed, the upper and lower ends of the parison 18 are clamped, and air is blown into the parison 18 to expand the parison 18. When this mold is closed or parison 1
8, the portion 18a of the parison 18 relative to the concave portion 16 contacts and locks with the tip of each guide piece 21 before the parison 18 contacts the cavity surface 14 of the side wall 2, and each guide piece 21
The portion 18a of the parison 18 is locked between the tips of the parison 18.
is set to a sufficiently large length x 1 .
ついで、パリソン１８内へのエアブローにより
パリソン１８が膨張し、パリソン１８がキヤビテ
イ面１４，１５に接触するとともに、凹状部１６
へも侵入を開始する。これとともに、各ガイド片
２１を後退させると、パリソン１８が膨張するに
したがつて、パリソン１８の部分１８ａで凸状部
３を形成し、側壁２に凸状部３を有する成形品１
を得る。 Next, the parison 18 is expanded by air blowing into the parison 18, and the parison 18 comes into contact with the cavity surfaces 14 and 15, and the concave portion 16
They also start invading. At the same time, when each guide piece 21 is retreated, as the parison 18 expands, a convex portion 3 is formed in the portion 18a of the parison 18, and a molded product 1 having the convex portion 3 on the side wall 2 is formed.
get.
（実施例）
以下、本発明の一実施例を図面を参照して説明
する。(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図において、１１は金型で、この金型１１
は接離自在の一対の成形型１２，１３からなり、
この一対の成形型１２，１３の内側に上記成形品
１の側壁２を含む部分を形成するキヤビテイ面１
４，１５が形成され、この一方の成形型１２の側
壁２を形成するキヤビテイ面１４の一部に上記凸
状部３を形成する凹状部１６が形成されている。
また、上記一対の成形型１２，１３間の上部にノ
ズル１７が設けられ、このノズル１７から円筒状
のパリソン１８が導出される。 In FIG. 1, 11 is a mold, and this mold 11
consists of a pair of molds 12 and 13 that can be freely moved into and out of contact with each other,
A cavity surface 1 forming a portion including the side wall 2 of the molded product 1 inside the pair of molds 12 and 13
4 and 15 are formed, and a concave portion 16 forming the convex portion 3 is formed in a part of the cavity surface 14 forming the side wall 2 of one of the molds 12.
Further, a nozzle 17 is provided above the pair of molds 12 and 13, and a cylindrical parison 18 is drawn out from this nozzle 17.
また、上記一方の成形型１２のキヤビテイ面１
４における凹状部１６の上下縁部にガイド片２１
が出没自在に設けられている。 Furthermore, the cavity surface 1 of the one mold 12 is
A guide piece 21 is attached to the upper and lower edges of the concave portion 16 at 4.
is set up so that you can come and go as you like.
この各ガイド片２１は、第２図に示すように取
付けられている。すなわち、上記一方の成形型１
２のキヤビテイ面１４において凹状部１６の上下
縁部に凹段部２２が設けられ、この凹段部２２に
上記ガイド片２１が基部を支軸２３により回動自
在に取付けられている。 Each guide piece 21 is attached as shown in FIG. That is, one of the molds 1
A recessed step portion 22 is provided at the upper and lower edges of the recessed portion 16 on the cavity surface 14 of No. 2, and the guide piece 21 is rotatably attached to the recessed step portion 22 at its base by a support shaft 23.
また、上記凹段部２２の内側に穴部２４が形成
され、この穴部２４の内端にエアシリンダ２５の
基部が支軸２６により回動自在に取付けられ、こ
のエアシリンダ２５から突出したピストンロツド
２７の先端部が上記ガイド片２１の中間部に連結
軸２８で回動自在に連結されている。そして、エ
アシリンダ２５の作動によりピストンロツド２７
を進退し、ガイド片２１をキヤビテイ内に所定角
度で突出した状態から凹段部２２内に位置する状
態へ回動するようになつている。 Further, a hole 24 is formed inside the recessed step 22, and the base of an air cylinder 25 is rotatably attached to the inner end of the hole 24 by a support shaft 26, and a piston rod protrudes from the air cylinder 25. The distal end portion of the guide piece 27 is rotatably connected to the intermediate portion of the guide piece 21 by a connecting shaft 28. Then, due to the operation of the air cylinder 25, the piston rod 27
The guide piece 21 is rotated from a state in which it protrudes into the cavity at a predetermined angle to a state in which it is located in the recessed step 22.
つぎに、作動を説明する。 Next, the operation will be explained.
成形にあたつては、第１図のように、金型１１
の一対の成形型１２，１３を型開きし、かつ、各
ガイド片２１をキヤビテイ内方に所定角度で突出
させておく。 During molding, as shown in Figure 1, a mold 11 is used.
The pair of molds 12 and 13 are opened, and each guide piece 21 is made to protrude inward of the cavity at a predetermined angle.
そして、ノズル１７からパリソン１８を吐出し
て一対の成形型１２，１３間に介在させ、必要に
応じてパリソン１８内にプリエアブローして、パ
リソン１８をやや膨張させる。 Then, the parison 18 is discharged from the nozzle 17 and interposed between the pair of molds 12 and 13, and if necessary, pre-air is blown into the parison 18 to slightly expand the parison 18.
ついで、一対の成形型１２，１３を型閉してパ
リソン１８の上下端部を挾持し、パリソン１８内
にエアブローしてパリソン１８を膨張させる。こ
の型閉時またはパリソン１８の初期膨張時に、第
３図のように、パリソン１８の凹状部１６に対す
る部分１８ａでは、パリソン１８が一般のキヤビ
テイ面１４に接触するより先に各ガイド片２１の
先端に接触係止され、この各ガイド片２１の先端
間に係止されたパリソン１８の部分１８ａは前記
第７図の部分８ａの長さＸより大きい長さX1に
設定される。 Next, the pair of molds 12 and 13 are closed to sandwich the upper and lower ends of the parison 18, and air is blown into the parison 18 to expand the parison 18. When the mold is closed or when the parison 18 initially expands, as shown in FIG. The portion 18a of the parison 18 that is contacted and locked between the ends of each guide piece 21 is set to have a length X1 larger than the length X of the portion 8a shown in FIG.
ついで、パリソン１８内へのエアブローにより
パリソン１８が膨張し、パリソン１８がキヤビテ
イ面１４，１５に接触するとともに、凹状部１６
へも侵入を開始する。これとともに、所定のタイ
ミングにより、たとえば、パリソン１８内にエア
ブローされた後、0.5〜1.5秒後に、各ガイド片２
１をエアシリンダ２５の作動により凹段部２２側
に回動させると、パリソン１８が膨張するにした
がつて、各ガイド片２１の先端がパリソン１８の
部分１８ａを引つぱりながら凹状部１６側へ回動
して行き、第４図のように、パリソン１８の部分
１８ａで凸状部３を形成し、第６図のような、側
壁２に凸状部３を有する成形品１を得る。 Next, the parison 18 is expanded by air blowing into the parison 18, and the parison 18 comes into contact with the cavity surfaces 14 and 15, and the concave portion 16
They also start invading. At the same time, at a predetermined timing, for example, 0.5 to 1.5 seconds after air is blown into the parison 18, each guide piece 2
1 is rotated toward the concave step 22 side by the operation of the air cylinder 25, as the parison 18 expands, the tips of each guide piece 21 pull the portion 18a of the parison 18 toward the concave section 16 side. As shown in FIG. 4, a convex portion 3 is formed in the portion 18a of the parison 18, and a molded product 1 having a convex portion 3 on the side wall 2 as shown in FIG. 6 is obtained.
その後、一対の成形型１２，１３を型開きして
成形品１を取出す。 Thereafter, the pair of molds 12 and 13 are opened and the molded product 1 is taken out.
このように、成形品１の側壁２の凸状部３を形
成する部分のパリソン１８を、キヤビテイ面１４
に突出したガイド片２１によつていつたん係止
し、つづいてガイド片２１を後退させて凹状部１
６により凸状部３を形成することにより、凸状部
３に対して必要かつ十分なパリソン１８が供給さ
れ、肉厚の均一な成形品１を得ることができる。 In this way, the part of the parison 18 forming the convex portion 3 of the side wall 2 of the molded product 1 is removed from the cavity surface 14.
The guide piece 21 that protrudes from the side is temporarily locked, and then the guide piece 21 is moved back and the concave part 1 is locked.
By forming the convex part 3 with the convex part 6, a necessary and sufficient parison 18 is supplied to the convex part 3, and a molded product 1 with a uniform wall thickness can be obtained.
また、上記実施例では、ガイド片２１をエアシ
リンダ２５によつて強制的に回動するようにして
いるが、第５図に示すように、ガイド片２１に対
して支軸２３部にばね３０を設け、このばね３０
によりガイド片２１をキヤビテイ内に所定角度で
突出する方向に付勢するとともに、ばね３０の力
をパリソン１８内へのエアブロー圧より小さく設
定し、ガイド片２１はばね３０の力により常時所
定の傾斜角まで起立しているが、成形時にエアブ
ロー圧によりパリソン１８の膨張にともない自動
的に回動後退されるようにしてもよい。 Further, in the above embodiment, the guide piece 21 is forcibly rotated by the air cylinder 25, but as shown in FIG. and this spring 30
The guide piece 21 is biased in the direction of protruding into the cavity at a predetermined angle, and the force of the spring 30 is set to be smaller than the air blow pressure into the parison 18, so that the guide piece 21 is always kept at a predetermined inclination by the force of the spring 30. Although it stands up to the corner, it may be configured to automatically rotate and retreat as the parison 18 expands due to air blow pressure during molding.
なお、ガイド片２１は凹状部１６の上下縁部に
対して設けるほか、凹状部１６の両側縁部、ある
いは、上下縁部と両側縁部の両方に対して設けて
もよく、少なくとも凹状部１６の縦横方向の幅広
方向に設けるのがよい。 In addition to providing the guide pieces 21 on the upper and lower edges of the recessed portion 16, the guide pieces 21 may be provided on both side edges of the recessed portion 16, or both the upper and lower edges and both side edges. It is preferable to provide it in the wide direction in the vertical and horizontal directions.
本発明によれば、成形品の側壁の凸状部を形成
する部分のパリソンを、キヤビテイ面に突出した
ガイド片によつていつたん係止し、つづいてガイ
ド片を後退させて凹状部により凸状部を形成する
ことにより、凸状部に対して必要かつ十分なパリ
ソンが供給され、肉厚の均一な、かつ、仕上りの
よい成形品を得ることができる。
According to the present invention, the portion of the parison that forms the convex portion of the side wall of the molded product is once locked by the guide piece protruding from the cavity surface, and then the guide piece is moved back and the parison forms the convex portion. By forming the convex portion, a necessary and sufficient parison is supplied to the convex portion, and a molded product having a uniform wall thickness and a good finish can be obtained.
また、金型に対しては、ガイド片を出没自在に
設ければよいので、機構も簡単にでき、コスト高
となることもない。 In addition, since the guide piece can be provided in the mold so that it can move in and out, the mechanism can be simplified and the cost will not be high.
第１図は本発明の装置の一実施例を示す断面
図、第２図はその一部の断面図、第３図および第
４図は成形状態を示す一部の断面図、第５図は他
の実施例を示す一部の断面図、第６図は成形品の
断面図、第７図は従来の装置の断面図である。
１……成形品、２……側壁、３……凸状部、１
１……金型、１４，１５……キヤビテイ面、１６
……凹状部、１８……パリソン、２１……ガイド
片。
FIG. 1 is a cross-sectional view showing one embodiment of the apparatus of the present invention, FIG. 2 is a partial cross-sectional view, FIGS. 3 and 4 are partial cross-sectional views showing the molding state, and FIG. A partial sectional view showing another embodiment, FIG. 6 is a sectional view of a molded product, and FIG. 7 is a sectional view of a conventional device. 1... Molded product, 2... Side wall, 3... Convex portion, 1
1... Mold, 14, 15... Cavity surface, 16
...Concave portion, 18...Parison, 21...Guide piece.
Claims (1)
より形成するブロー成形装置であつて、 上記成形品の側壁を形成するキヤビテイ面に上
記凸状部を形成する凹状部を設けた金型と、 上記凹状部の縁部に出没自在に設けられ、キヤ
ビテイ内方に突出してパリソンの膨張時に上記側
壁を形成するキヤビテイ面より先にパリソンが接
触するとともに上記凸状部を形成する凹状部への
パリソンの侵入時に後退するガイド片と、 を備えたことを特徴とするブロー成形装置。[Scope of Claims] 1. A blow molding device for forming a molded article having a convex portion on a side wall by blow molding, wherein a concave portion forming the convex portion is formed on a cavity surface forming the side wall of the molded article. The mold provided thereon and the parison come into contact with each other before the cavity surface which is provided on the edge of the concave portion so as to be freely protrusive and retractable and which protrudes inward of the cavity and forms the side wall when the parison expands, and forms the convex portion. A blow molding device comprising: a guide piece that retreats when a parison enters a concave portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63051008A JPH01225529A (en) | 1988-03-04 | 1988-03-04 | Blow molding apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63051008A JPH01225529A (en) | 1988-03-04 | 1988-03-04 | Blow molding apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01225529A JPH01225529A (en) | 1989-09-08 |
| JPH0549018B2 true JPH0549018B2 (en) | 1993-07-23 |
Family
ID=12874748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63051008A Granted JPH01225529A (en) | 1988-03-04 | 1988-03-04 | Blow molding apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01225529A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996016874A1 (en) * | 1994-12-01 | 1996-06-06 | Stoner Theodore A | Interlocking drink containers and related packaging |
| JP5159166B2 (en) * | 2007-05-16 | 2013-03-06 | みのる化成株式会社 | Blow molding method and blow molding die |
-
1988
- 1988-03-04 JP JP63051008A patent/JPH01225529A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01225529A (en) | 1989-09-08 |
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