JPS6328766B2 - - Google Patents
Info
- Publication number
- JPS6328766B2 JPS6328766B2 JP55140012A JP14001280A JPS6328766B2 JP S6328766 B2 JPS6328766 B2 JP S6328766B2 JP 55140012 A JP55140012 A JP 55140012A JP 14001280 A JP14001280 A JP 14001280A JP S6328766 B2 JPS6328766 B2 JP S6328766B2
- Authority
- JP
- Japan
- Prior art keywords
- parison
- nozzle
- wall thickness
- slice lip
- mandrel
- 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
Links
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000000071 blow moulding Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 10
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/325—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
-
- 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
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/302—Extrusion nozzles or dies being adjustable, i.e. having adjustable exit sections
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92647—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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
【発明の詳細な説明】
本発明はブロー成形機において、ノズルとマン
ドレルの間から押出されるパリソンの肉厚を周方
向に変化させ、且つパリソンの長手方向各位置に
おいても任意の周方向位置で肉厚を変化させるこ
とができるようにしたパリソンの肉厚制御装置に
関する。Detailed Description of the Invention The present invention is a blow molding machine in which the thickness of the parison extruded from between the nozzle and the mandrel is varied in the circumferential direction, and the thickness of the parison is changed at any circumferential position at each longitudinal position of the parison. This invention relates to a parison wall thickness control device that can change the wall thickness.
従来より種々の方式にてパリソンの肉厚制御を
行うようにしているが夫々次に示すような問題点
を有していた。 Conventionally, various methods have been used to control the thickness of the parison, but each method has had the following problems.
(a) ノズル・マンドレルのパリソン出口部の一部
を削るダイシエービング方式があるが、この方
式においては周方向所定の位置でしか肉厚を変
化させることができずしかもパリソンの長手方
向には一様の肉厚とすることしかできない。(a) There is a die shaving method in which a part of the parison exit part of the nozzle mandrel is shaved off, but with this method, the wall thickness can only be changed at a predetermined position in the circumferential direction, and in the longitudinal direction of the parison. It is only possible to make the wall thickness uniform.
(b) 従来一般に行われているマンドレル又はノズ
ルを上下させるようにしたパリソンの肉厚制御
方式においては、本質的に周方向には肉厚が均
一のままであり、パリソンの周方向任意の位置
の肉厚を制御することができず、肉厚、形状が
周方向に非対称な製品を成形するには無駄な厚
肉部分が生じ、製品精度の低下、コストの上昇
をまねいていた。(b) In the conventional parison wall thickness control method in which the mandrel or nozzle is moved up and down, the wall thickness essentially remains uniform in the circumferential direction, and the thickness can be controlled at any position in the circumferential direction of the parison. It is not possible to control the wall thickness of the product, and when molding a product with asymmetric wall thickness and shape in the circumferential direction, unnecessary thick parts are created, leading to a decrease in product precision and an increase in cost.
(c) ノズルリングを水平に動かすようにしたサー
ボ式の肉厚制御方式があるが、この方式におい
てはパリソンの周方向任意の個所の肉厚をある
程度制御できるが、ノズルリング全体を動かす
ために一側の肉厚が厚くなれば円周上反対側の
肉厚は薄くなるという本質的な欠点がある。ま
た大型のブロー成形機になると、前記ノズルリ
ングを動かすための過大の動力が必要である。(c) There is a servo-type wall thickness control method that moves the nozzle ring horizontally. In this method, the wall thickness at any point in the circumferential direction of the parison can be controlled to some extent, but in order to move the entire nozzle ring, An essential drawback is that if the wall thickness on one side becomes thicker, the wall thickness on the opposite circumferential side becomes thinner. Moreover, in the case of a large-sized blow molding machine, an excessive amount of power is required to move the nozzle ring.
(d) ノズルをフレキシブルなリングで構成し、周
方向の複数個所で押し引きするようにしたサー
ボ式の肉厚制御方式があるが、フレキシブルリ
ングの周方向長さが一定であるため、周方向の
一個所のみ肉厚を薄くして他はそのままという
ことはできず、例えば押して薄くした部分の左
右が厚くなるという欠点がある。また大型のブ
ロー成形機になるとフレキシブルなリング状ノ
ズルの製作コストが非常に高くなるという欠点
を有していた。(d) There is a servo thickness control method in which the nozzle is made up of a flexible ring that is pushed and pulled at multiple points in the circumferential direction, but since the circumferential length of the flexible ring is constant, It is not possible to reduce the wall thickness in one area and leave the rest as it is; for example, there is a drawback that the left and right sides of the area that was made thinner by pressing become thicker. Moreover, when a large-sized blow molding machine is used, the manufacturing cost of a flexible ring-shaped nozzle becomes extremely high.
本発明は上記各従来方式のもつ欠点を排斥すべ
くなしたもので、ブロー成形機におけるマンドレ
ルとノズルにて環状のパリソン押出しスリツト部
を形成し、前記ノズル下端の周方向所定個所に、
ノズル内径より曲率半径の大きい先端部を有する
スライスリツプを、先端部の前記スリツト部内に
対する突出量を調整可能に取付けたことを特徴と
するパリソンの肉厚制御装置、に係るものであ
る。 The present invention has been made to eliminate the drawbacks of the above-mentioned conventional methods, and includes forming an annular parison extrusion slit portion using a mandrel and a nozzle in a blow molding machine, and at a predetermined position in the circumferential direction at the lower end of the nozzle.
This invention relates to a parison wall thickness control device, characterized in that a slice lip having a tip having a radius of curvature larger than the inner diameter of the nozzle is attached such that the amount of protrusion of the tip into the slit portion can be adjusted.
以下本発明の実施例を図面を参照して説明す
る。 Embodiments of the present invention will be described below with reference to the drawings.
第１図及び第２図は本発明の一例を示すもの
で、マンドレル１の外周を所定の間隔を有して包
囲するヘツドボデー２の下端に、前記間隔からの
樹脂３の厚みを前記マンドレル１の下端との間で
絞つて所定肉厚のパリソン４を成形するノズル５
をクランプ具６により取付けている。 1 and 2 show an example of the present invention, in which a resin 3 is applied to the lower end of a head body 2 that surrounds the outer periphery of a mandrel 1 at a predetermined interval, and the thickness of the resin 3 from the above-mentioned interval is applied to the mandrel 1. A nozzle 5 that squeezes between the lower end and forms a parison 4 of a predetermined thickness.
is attached with a clamp tool 6.
上記ノズル５の下端部周方向所定個所に、水平
方向にスライドして前記マンドレル１の下端部と
の間のパリソン４押し出しスリツトＳのスリツト
間隔Ｓ１を狭める調整を行えるようにしたスライ
スリツプ７を、支持ブロツク８を介してスライド
自在に取付ける。前記支持ブロツク８は前記スラ
イスリツプ７を貫通してノズル５下面に螺合する
複数の取付ボルト９にてノズル５に固定されるよ
うになつているが、スライスリツプ７における前
記取付ボルト９の貫通部にはスライスリツプ７を
スライドさせる方向に長孔１０を形成しているの
で、スライスリツプ７のスライド作動は阻害され
ない。更に上記スライスリツプ７のスライド駆動
を行うためのシリンダ装置１１をブラケツト１２
を介して前記ノズル５の外周に固定し、前記シリ
ンダ装置１１の作動ロツド１３を前記スライスリ
ツプ７にピン１４連結する。図中１５は前記シリ
ンダ装置１１の作動位置検出器である。 At a predetermined position in the circumferential direction of the lower end of the nozzle 5, there is provided a slice lip 7 which can be slid horizontally to narrow the slit interval S1 of the extrusion slit S of the parison 4 between the lower end of the mandrel 1 and the lower end of the mandrel 1. It is slidably attached via a support block 8. The support block 8 is fixed to the nozzle 5 with a plurality of mounting bolts 9 that pass through the slice lip 7 and are screwed onto the lower surface of the nozzle 5. Since the elongated hole 10 is formed in the section in the direction in which the slice lip 7 is slid, the sliding operation of the slice lip 7 is not hindered. Furthermore, a cylinder device 11 for slidingly driving the slice lip 7 is mounted on a bracket 12.
The actuating rod 13 of the cylinder device 11 is connected to the slice lip 7 by a pin 14. In the figure, 15 is an operating position detector of the cylinder device 11.
マンドレル１とヘツドボデー２の間に圧入され
た樹脂３は、マンドレル１とノズル５の下端部に
形成されるスリツトＳからパリソン４として押し
出される。 The resin 3 press-fitted between the mandrel 1 and the head body 2 is extruded as a parison 4 through a slit S formed at the lower end of the mandrel 1 and the nozzle 5.
この状態において、シリンダ装置１１を伸長作
動させてスライスリツプ７を前進させることによ
り前記スリツト部Ｓの内部にその先端部を突出さ
せ、他の部分のスリツト間隔Ｓ１に比較して間隔
がＳ２のように狭くなる如く変更する。これに伴
ない、前記スリツトＳの間隔の変化に比例してパ
リソン４の肉厚も他の部分が（t1）であるのに対
し前記スライスリツプ７でスリツト間隔を狭めら
れた個所は（t2）のように変化する。前記スライ
スリツプ７のスライド作動はシリンダ装置１１を
サーボバルブ等により移動量を位置検出器１５で
検出しつつ行い、且つその作動パターンは従来マ
ンドレルを上下させて肉厚制御を行う際に実施し
ているように予めピンボード等に設定しておくよ
うにする。また前記スライスリツプ７の先端部形
状は成形したいパリソン４の形によつて任意に決
定される。 In this state, the cylinder device 11 is extended and the slice lip 7 is moved forward, so that its tip protrudes into the inside of the slit portion S, and the slit spacing becomes S2 compared to the slit spacing S1 in other portions. Change it so that it becomes narrower. Along with this, in proportion to the change in the spacing between the slits S, the wall thickness of the parison 4 is (t 1 ) in other parts, whereas it is (t 1 ) in the part where the slit spacing is narrowed by the slice lip 7. 2 ) It changes like this. The sliding operation of the slice lip 7 is performed while the displacement of the cylinder device 11 is detected by a position detector 15 using a servo valve or the like, and the operation pattern is similar to that conventionally performed when controlling the wall thickness by moving the mandrel up and down. Make sure to set it on a pinboard etc. in advance so that it will be displayed. Further, the shape of the tip of the slice lip 7 is arbitrarily determined depending on the shape of the parison 4 to be formed.
上記により、自動車用ガソリンタンク、太陽熱
コレクター等のような非対称な肉厚をもつ複雑な
形状の成形品を容易に成形することができる。 As a result of the above, it is possible to easily mold molded products having complex shapes with asymmetrical wall thicknesses, such as automobile gasoline tanks, solar collectors, and the like.
尚、上記実施例においてはスライスリツプを一
個所に設けた場合について説明したが、複数個所
に設けることにより周方向複数個所において肉厚
を変化させることができること、スライスリツプ
のスライド作動は水平方向に限らず、スリツト間
隔の調整を行えるならば斜めに、又は垂直にスラ
イドさせるようにしてもよいこと、必要ならばス
ライスリツプをマンドレルの下端側に設けること
も可能であること、従来のマンドレルを上下させ
ることによる肉厚制御方式と組み合わせることに
より更に広範な制御が可能であること、スライス
リツプの厚さ寸法は薄い程圧力抵抗が少なく望ま
しいがパリソンの粘弾性的な記憶効果を考慮して
適宜選定し得ること、スライスリツプの先端部に
おける樹脂流路に対する角度も樹脂の圧力降下、
肌荒れ等を考慮して適宜選定し得ること、その他
本発明の要旨を逸脱しない範囲内において種々変
更を加え得ること、等は勿論である。 In the above embodiment, the case where the slice lip is provided at one location has been explained, but by providing it at multiple locations, the wall thickness can be changed at multiple locations in the circumferential direction, and the sliding operation of the slice lip can be performed in the horizontal direction. However, if the slit spacing can be adjusted, it may be possible to slide the slit diagonally or vertically, and if necessary, it is also possible to provide a slicing lip on the lower end of the mandrel. A wider range of control is possible when combined with a wall thickness control method based on the thickness of the slice lip.The thinner the slice lip is, the less pressure resistance it is desirable to have, but the thickness should be selected appropriately, taking into account the viscoelastic memory effect of the parison. It is possible that the angle at the tip of the slice lip with respect to the resin flow path also affects the pressure drop of the resin,
It goes without saying that it can be appropriately selected in consideration of rough skin, etc., and that various other changes can be made without departing from the gist of the present invention.
上記した本発明のパリソンの肉厚制御装置によ
れば、次のような優れた効果を奏し得る。 According to the parison wall thickness control device of the present invention described above, the following excellent effects can be achieved.
(i) スライスリツプをパリソン押し出しスリツト
部の周方向任意の個所に適数個設けていること
により、周方向に非対称な任意の肉厚分布を有
し、長さ方向に肉厚が変化したパリソンを容易
に成形することができる。(i) By providing an appropriate number of slicing lips at arbitrary circumferential locations of the parison extrusion slit portion, a parison with an arbitrary thickness distribution that is asymmetrical in the circumferential direction and whose wall thickness changes in the length direction is created. can be easily molded.
(ii) パリソンの押し出しスリツトをスライスリツ
プにより直接狭めたり広げたりするようにして
いるので、スライスリツプの受圧面積が極めて
小さく、スライスリツプに大きな力が作用する
ことがないのでスライド作動を行うシリンダ装
置を小型化でき、スリツト間隔の調整を容易に
行うことができる。(ii) Since the extrusion slit of the parison is directly narrowed or widened by the slice lip, the pressure-receiving area of the slice lip is extremely small, and no large force is applied to the slice lip, so the cylinder device performs sliding operation. can be made smaller, and the slit interval can be easily adjusted.
(iii) 既存の設備に容易に適用できる。(iii) can be easily adapted to existing equipment;
(iv) スライスリツプを作動する動力が小さくて済
み特別なノズル構造も必要としないので、簡単
な構造で安価に実施することができる。(iv) Since the power required to operate the slice lip is small and no special nozzle structure is required, it can be implemented at a simple structure and at low cost.
(v) マンドレルを上下することによる肉厚の制御
方式と組み合わせて実施することにより更に広
範な制御が可能である。(v) A wider range of control is possible by combining this with a wall thickness control method by moving the mandrel up and down.
(iv) ノズル内径より曲率半径の大きい先端部を有
するスライスリツプをノズル下端に設けている
ので、凹凸や筋目がなく肉厚が滑らかに減少す
るパリソンを製造することができる。(iv) Since a slice lip having a tip having a radius of curvature larger than the inner diameter of the nozzle is provided at the lower end of the nozzle, it is possible to manufacture a parison whose wall thickness decreases smoothly without unevenness or streaks.
第１図は本発明の一実施例を示す切断正面図、
第２図は第１図の方向矢視図である。
１はマンドレル、２はヘツドボデー、４はパリ
ソン、５はノズル、７はスライスリツプ、１１は
シリンダ装置、１５は位置検出器、Ｓはパリソン
押し出しスリツトを示す。
FIG. 1 is a cutaway front view showing an embodiment of the present invention;
FIG. 2 is a directional view of FIG. 1. 1 is a mandrel, 2 is a head body, 4 is a parison, 5 is a nozzle, 7 is a slice lip, 11 is a cylinder device, 15 is a position detector, and S is a parison extrusion slit.
Claims (1)
て環状のパリソン押出しスリツト部を形成し、前
記ノズル下端の周方向所定個所に、ノズル内径よ
り曲率半径の大きい先端部を有するスライスリツ
プを、先端部の前記スリツト部内に対する突出量
を調整可能に取付けたことを特徴とするパリソン
の肉厚制御装置。1. A mandrel and a nozzle in a blow molding machine form an annular parison extrusion slit, and a slice lip having a tip having a radius of curvature larger than the inner diameter of the nozzle is placed at a predetermined position in the circumferential direction of the lower end of the nozzle, and the slice lip is inserted into the slit at the tip. A parison wall thickness control device characterized by being installed so that the amount of protrusion relative to the inside of the parison can be adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55140012A JPS5764524A (en) | 1980-10-07 | 1980-10-07 | Device for controlling thickness of parison |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55140012A JPS5764524A (en) | 1980-10-07 | 1980-10-07 | Device for controlling thickness of parison |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5764524A JPS5764524A (en) | 1982-04-19 |
| JPS6328766B2 true JPS6328766B2 (en) | 1988-06-09 |
Family
ID=15258874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55140012A Granted JPS5764524A (en) | 1980-10-07 | 1980-10-07 | Device for controlling thickness of parison |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5764524A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1159953B (en) * | 1983-01-06 | 1987-03-04 | Saiag Spa | SEAL FOR MOTOR VEHICLE BODIES AND EXTRUSION HEAD TO CREATE SUCH SEAL |
| JPS59140032A (en) * | 1983-02-01 | 1984-08-11 | Ishikawajima Harima Heavy Ind Co Ltd | Regulator for thickness of parison in blow molding machine |
| JPS6230020A (en) * | 1985-08-01 | 1987-02-09 | Ishikawajima Harima Heavy Ind Co Ltd | Plastic blow molding process |
| EP2578379A1 (en) * | 2011-10-05 | 2013-04-10 | Sumika Polymer Compounds (France) SA | Solar thermal solutions using blow moulding technologies |
| FR3085616B1 (en) * | 2018-09-06 | 2022-05-06 | Pinard Emballages | METHOD FOR MANUFACTURING A THICK WALL PLASTIC CONTAINER, EXTRUSION BLOW MOLDING MACHINE AND THICK WALL PLASTIC CONTAINER |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52115870A (en) * | 1976-03-13 | 1977-09-28 | Elbatainer Kunststoff | Method and device for producing hollow article from thermoplastic synthetic resin |
-
1980
- 1980-10-07 JP JP55140012A patent/JPS5764524A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52115870A (en) * | 1976-03-13 | 1977-09-28 | Elbatainer Kunststoff | Method and device for producing hollow article from thermoplastic synthetic resin |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5764524A (en) | 1982-04-19 |
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