JPS5934489B2 - Manufacturing method for hollow molded products - Google Patents

Manufacturing method for hollow molded products

Info

Publication number
JPS5934489B2
JPS5934489B2 JP57139623A JP13962382A JPS5934489B2 JP S5934489 B2 JPS5934489 B2 JP S5934489B2 JP 57139623 A JP57139623 A JP 57139623A JP 13962382 A JP13962382 A JP 13962382A JP S5934489 B2 JPS5934489 B2 JP S5934489B2
Authority
JP
Japan
Prior art keywords
parison
mold
time
cutter
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
Application number
JP57139623A
Other languages
Japanese (ja)
Other versions
JPS5929131A (en
Inventor
平和 黒岩
泰郎 大場
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.)
Kao Corp
Original Assignee
Kao Soap 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 Kao Soap Co Ltd filed Critical Kao Soap Co Ltd
Priority to JP57139623A priority Critical patent/JPS5934489B2/en
Publication of JPS5929131A publication Critical patent/JPS5929131A/en
Publication of JPS5934489B2 publication Critical patent/JPS5934489B2/en
Expired 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
    • 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
    • B29C2948/92009—Measured parameter
    • B29C2948/92085—Velocity
    • 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
    • B29C2948/92009—Measured parameter
    • B29C2948/92304—Presence or absence; Sequence; Counting
    • 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
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92428—Calibration, after-treatment, or cooling 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92638—Length
    • 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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 本発明は、ブロー成形装置において、押出機によつてパ
リソン（溶融樹脂）を押し出し、これを成形装置に取り
付けた金型内に喰え込ませてブロー成形する工程を繰り
返して行う場合に、金型内に把持されるパリソンの長さ
を一定に保つことにより肉厚異常のない中空成形品を製
造する方法に関する。DETAILED DESCRIPTION OF THE INVENTION In a blow molding device, the present invention repeatedly extrudes a parison (molten resin) using an extruder, inserts it into a mold attached to the molding device, and performs blow molding. The present invention relates to a method for manufacturing a hollow molded product without wall thickness abnormalities by keeping the length of the parison held in the mold constant.

通常のブロー成形工程は、次の如き過程から成る。A typical blow molding process consists of the following steps.

第１図に示すように、ブローステーションでブロー成形
が完了した後、即ち金型３、３’が開き、そこに把持さ
れていたパリソン内に空気を吹き込んでいたブローニー
ドル４が上昇して成形品６が取り出された後、金型３、
３’はブローステーションから押出機のヘッド１の直下
まで移動する。そして第２図の如く、押出機ヘッド１か
ら押し出されている筒状の溶融樹脂すなわちパリソン２
が金型３、３’間に把持され（型締）、直ちにカッター
７によつて切断される。その後、第３図に示す如く切断
されたパリソン２’を喰え込んだ金型３、３’はブロー
ステーションに移動し、ブローニードル４が金型３、３
’内に把持されたパリソン２’に打ち込まれ、ブローニ
ードル４から空気が吹き込まれることによつて、中空成
形品６が完成する。そして再び第１図の状態に戻り、こ
の工程が繰り返して行われることになるのである。従来
、このようなブロー成形工程においては、パリソンを押
し出す押出機と、パリソンを金型に把持しブロー成形を
行う成形機とは独立に動作するものであつて、この両者
の単なる組合せによつてブロー成形装置が成り立つてい
る。As shown in Fig. 1, after blow molding is completed at the blow station, that is, the molds 3 and 3' are opened, and the blow needle 4, which was blowing air into the parison held there, rises to form the parison. After the product 6 is taken out, the mold 3,
3' moves from the blow station to just below the head 1 of the extruder. As shown in FIG. 2, a cylindrical molten resin or parison 2 is extruded from the extruder head 1.
is held between the molds 3 and 3' (mold clamping) and immediately cut by the cutter 7. Thereafter, as shown in FIG. 3, the molds 3, 3' that have bitten the cut parison 2' are moved to the blow station, and the blow needle 4 is moved to the molds 3, 3'.
The hollow molded product 6 is completed by being driven into the parison 2 held within the parison 2 and blowing air from the blow needle 4. Then, the state shown in FIG. 1 is returned again, and this process is repeated. Conventionally, in such a blow molding process, an extruder that extrudes the parison and a molding machine that holds the parison in a mold and performs blow molding operate independently. Blow molding equipment is established.

そのため、再生品の混入率や樹脂温度の変動によつて押
出機からパリソンが押し出される速度が変化したり、油
温や油圧の変動によつて金型が移動する速度が変化した
りすると、金型内に把持されるパリソンの長さは変化し
てしまう。ところが、ポリエチレン等によつて容器をブ
ロー成形する場合、容器の肉厚分布を均一にするために
、パリソン肉厚調節装置を用いてパリソンに一定の肉厚
差を与えるのが通常であるから、パリソンの長さが変化
することは中空成形品の肉厚異常を発生せしめる原因と
なる。すなわち、例えば第４図ａに示す如く、パリソン
肉厚調節装置（図示せず）を用いて厚肉としたＰ部を有
するパリソン８と金型３，３′とが正常な位置関係にあ
れば、第４図ｂに断面が示されるように一定の肉厚を有
する中空成形品９が得られる。この場合のパリソン長さ
をＬ３とすれば、それよ・りも短いパリソン長Ｌ３′で
あつた場合には、第５図ａに示す如くパリソンの厚肉部
Ｐは上方にずれるため、成形された容器は第５図ｂのよ
うに巾広部Ｑが薄肉の不良品となる。また、パリソン長
がＬ３よりも長いＬ３！であつた場合には、第６図ａの
ように厚肉部Ｐが下方にずれるため、この場合にも成形
された容器は第６図ｂのように巾広部Ｑが薄肉の不良品
となる。このような不具合に鑑みて完成されたのが本発
明であつて、金型内に把持されるパリソン長が変化する
ことなく、従つて常に均一の肉厚を有する中空成形品を
得ることの出来る、中空成形品の製造方法を提供するも
のである。Therefore, if the speed at which the parison is extruded from the extruder changes due to fluctuations in the percentage of recycled products mixed in or resin temperature, or if the speed at which the mold moves changes due to fluctuations in oil temperature or hydraulic pressure, the mold The length of the parison held within the mold will vary. However, when blow molding containers from polyethylene or the like, it is common to use a parison wall thickness adjustment device to give a certain thickness difference to the parison in order to make the wall thickness distribution of the container uniform. Changes in the length of the parison cause wall thickness abnormalities in the hollow molded product. That is, as shown in FIG. 4a, for example, if the parison 8, which has a thickened P section using a parison thickness adjustment device (not shown), and the molds 3, 3' are in a normal positional relationship. A hollow molded product 9 having a constant wall thickness as shown in cross section in FIG. 4b is obtained. If the parison length in this case is L3, if the parison length is shorter than L3', the thick part P of the parison will shift upwards as shown in Figure 5a, so that it will not be formed. As shown in FIG. 5b, the container is defective because the wide portion Q is thin. Also, L3 has a longer parison length than L3! In this case, the thick part P shifts downward as shown in Fig. 6a, and the molded container in this case is also a defective product with a thin wide part Q as shown in Fig. 6b. Become. The present invention was completed in view of these problems, and it is possible to obtain a hollow molded product that always has a uniform wall thickness without changing the length of the parison held in the mold. , provides a method for manufacturing a hollow molded product.

即ち、本発明はパリソンを押し出す押出機と、押し出さ
れたパリソンを把持するためプローステーシヨンから押
出機のヘツド直下まで移動するブロー成形用金型と、金
型に把持されたパリソンを切断するカツタ一とを有する
成形機を用いてブロー成形により中空成形品を製造する
方法に於いて、パリソンの押し出し毎にパリソンの押出
速度および金型の移動開始よりパリソンが切断されるま
での所要時間を計測し、これらの計測値を用いてパリソ
ンが所定の長さに達する時刻に金型がパリソンを把持し
てパリソンをカツタ一が切断する様金型の作動を制御す
ることを特徴とする中空成形品の製造方法を提供するも
のである。That is, the present invention includes an extruder for extruding a parison, a blow molding mold that moves from a blowing station to just below the head of the extruder to grip the extruded parison, and a cutter for cutting the parison gripped by the mold. In a method of manufacturing hollow molded products by blow molding using a molding machine having A hollow molded product characterized in that, using these measured values, the operation of the mold is controlled so that the mold grips the parison and cuts the parison with a cutter when the parison reaches a predetermined length. A manufacturing method is provided.

以下本発明を実施例について説明する。第１図において
、金型３，３′間に把持されるべきパリソン２の長さを
Ｌ３とする。The present invention will be described below with reference to Examples. In FIG. 1, the length of the parison 2 to be held between the molds 3 and 3' is L3.

また金型３，３′と連動するパリソンカツター７から降
下するパリソンの通路上にセツトしたパリソン検出装置
５までの距離をＬ１とし、パリソン検出装置５からＬ３
に到るまでの距離をＬ２とする。このパリソン検出装置
５には、例えば光電管などが用いられる。ここで金型３
，３！がプローステーシヨンから押出機ヘツド１の直下
まで移動し、型を閉じてパリソン２を把持し、パリソン
カツター７がパソソン２を切断するまでに要する時間が
、例えばリミツトスイツチ１４，１５を用いて金型３，
３″とパリソンカツター７の作動を検出することにより
測定した結果Ｔ２であつたとする。またパリソンカツタ
ー７で切断されたパリソン２がさらに押出機ヘツド１か
ら押し出され、パリソン検出装置５に検出されるまでの
時間がＴ１であつたとする。このＴ１は例えばリミツト
スイツチ１５と、光電管の如きパリソン検出装置５によ
つて測定される。この結果、パリソンが押出機ヘツドか
ら押し出される速度はＬ１／Ｔ１と計算される。このこ
とから、パリソンがパリソン検出装置５を通過した後、
さらにＬ２だけ降下するのに要する時間はＬ２／（Ｌ１
／Ｔ１）と計算される。金型３，３″がＬ３の長さのパ
リソンを把持するためには、パリソン２がＬ３に達する
時刻よりＴ２だけ早く金型３，３′の作動を開始すれば
よいから、例えば金型の作動の制御の起点をパリソン２
がパリソン検出装置５を通過した時点にとれば、金型３
，３′の作動開始タイミングは次のようになる。即ち、
パリソンの押出速度はＬ１／Ｔ１であり、パリソン長Ｌ
３に達するのに要する時間、換言すればパリソンがＬ２
だけ降下するのに要する時間はＬ２／（Ｌ１／Ｔ１）で
ある。また、金型３，３５がプローステーシヨンから押
出機ヘツド１の直下まで移動し、型を閉じてパリソン２
を把持し、パリソンカツター７がパリソン２を切断する
までに要する時間は、前回の金型の作動実績からＴ２で
ある。従つて、金型３，３／の作動開始タイミングは、
パリソン２がパリソン検出装置５を通過した時点から、
Ｌ２／（Ｌ１／Ｔ１）−Ｔ２だけの時間が経過した時で
ある。すなわち、この時に金型３，３′がプローステー
シヨンから押出機ヘツド１の直下まで移動する動作を開
始させれば、金型３，ざに把持されるパリソンの長さは
常にＬ３となる。以上の制御事例を図示すれば、第７図
の如くである。またこの場合のフローチヤートを第８図
に示した。なお、Ｔ２は測定された時間をもとに演算を
行い、算出してもよい。上述の実施例は、金型３，３″
の作動開始の起点をパリソン検出装置５に検出された時
点とした場合であるが、この起点は他の時点でも良いこ
とは勿論である。Further, the distance from the parison cutter 7 that interlocks with the molds 3 and 3' to the parison detection device 5 set on the path of the descending parison is defined as L1, and from the parison detection device 5 to L3
Let the distance to reach L2 be L2. This parison detection device 5 uses, for example, a phototube. Here mold 3
,3! The time required for the parison cutter 7 to move from the protrusion station to just below the extruder head 1, close the mold, grip the parison 2, and cut the parison 2 using the limit switches 14 and 15, for example, 3,
3'' and the operation of the parison cutter 7 and the measurement result is T2. Furthermore, the parison 2 cut by the parison cutter 7 is further extruded from the extruder head 1 and detected by the parison detection device 5. Assume that the time taken for the parison to be extruded from the extruder head is T1. This T1 is measured by, for example, a limit switch 15 and a parison detection device 5 such as a phototube. As a result, the speed at which the parison is extruded from the extruder head is L1/T1. From this, after the parison passes through the parison detection device 5,
The time required to further descend by L2 is L2/(L1
/T1). In order for the molds 3, 3'' to grip a parison with a length of L3, it is only necessary to start the operation of the molds 3, 3' T2 earlier than the time when the parison 2 reaches L3. Parison 2 is the starting point for controlling the operation.
If it is taken at the time when it passes the parison detection device 5, the mold 3
, 3' start timing is as follows. That is,
The parison extrusion speed is L1/T1, and the parison length L
In other words, the time required for the parison to reach L2
The time required to descend by L2/(L1/T1) is L2/(L1/T1). Also, the molds 3 and 35 are moved from the protrusion station to just below the extruder head 1, and the molds are closed and the parison 2 is moved.
The time required for the parison cutter 7 to cut the parison 2 from the time it grips the parison 2 is T2 based on the previous operating performance of the mold. Therefore, the operation start timing of the molds 3, 3/ is as follows:
From the moment the parison 2 passes the parison detection device 5,
This is when a time period of L2/(L1/T1)-T2 has elapsed. That is, if the molds 3 and 3' start moving from the protrusion station to just below the extruder head 1 at this time, the length of the parison gripped between the molds 3 and 3 will always be L3. The above control example is illustrated in FIG. 7. A flowchart in this case is shown in FIG. Note that T2 may be calculated by performing an operation based on the measured time. In the above embodiment, the mold 3,3''
In this case, the starting point for starting the operation is the time when the parison detection device 5 detects the detection, but it goes without saying that this starting point may be at another time.

例えばパリソンカツター７がパリソンを切断した時点を
起点としても、同様の原理で金型の作動を制御できる。
また、上記の例では金型３，３１がプローステーシヨン
から押出機ヘツド１の直下へと移動を開始する動作を制
御しているが、他の金型の作動について制御を行つても
同様の結果が得られる。例えば押出機ヘツド１の直下ま
で移動した金型が、パリソンを把持するために型を閉じ
る動作を制御することが考えられる。以上、本発明の製
造方法によれば、繰り返し行われるブロー成形工程にお
いて毎工程ごとにパリソンの押出速度（降下速度）と金
型の作動時間が計測され、毎工程ごとに金型の作動が制
御されるため、パリソンの押出速度や金型の作動速度に
変化が生じても、常に一定のパリソン長が得られる。そ
のため第４図ａのようにパリソンに厚肉部が設けられて
いても、それが金型との関係において上下にずれること
はなく、第５図ｂ、第６図ｂに示すような巾広部が薄肉
の不良品が成形されてしまうことはない。従つて原料も
無駄になることがなく、本発明は極めて効率の良い中空
成形品の製造方法である。For example, the operation of the mold can be controlled using the same principle starting from the time when the parison cutter 7 cuts the parison.
In addition, in the above example, the operation of the molds 3 and 31 to start moving from the prosthesis station to directly below the extruder head 1 is controlled, but the same result can be obtained even if the operation of other molds is controlled. is obtained. For example, it is conceivable that the mold, which has been moved directly below the extruder head 1, controls the operation of closing the mold in order to grip the parison. As described above, according to the manufacturing method of the present invention, the extrusion speed (lowering speed) of the parison and the operating time of the mold are measured for each step in the repeated blow molding process, and the operation of the mold is controlled for each step. Therefore, a constant parison length can always be obtained even if the extrusion speed of the parison or the operating speed of the mold changes. Therefore, even if a thick part is provided in the parison as shown in Figure 4a, it will not shift vertically in relation to the mold, and the width will be increased as shown in Figures 5b and 6b. Defective products with thin sections will not be molded. Therefore, raw materials are not wasted, and the present invention is an extremely efficient method for producing blow molded products.

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

第１図から第３図は本発明の製造方法を実施するために
使用される成形機の動作の概略を示す斜視図、第４図か
ら第６図はそれぞれａはパリソンを把持した金型の断面
図、ｂは成形品の断面図である。 また第７図は本発明における実施例の制御事例をグラフ
を用いて示した図であり、第８図は実施例のフローチヤ
ートを示す。１・・・・・・押出機ヘツド、２・・・・
・・パリソン、３，３″・・・・・・金型、４・・・・
・・プロー[メ[ドル、５・・・・・・パリソン検出装置
、６・・・・・・成形品、７・・・・・・パリソンカツ
タ一 ８・・・・・・厚肉部を有するパリソン、９，１
０，１１・・・・・・成形品。Figures 1 to 3 are perspective views showing the outline of the operation of a molding machine used to carry out the manufacturing method of the present invention, and Figures 4 to 6 respectively show a mold holding a parison. Sectional view b is a cross-sectional view of the molded product. Further, FIG. 7 is a graph showing a control example of an embodiment of the present invention, and FIG. 8 is a flowchart of the embodiment. 1... Extruder head, 2...
...Parison, 3,3''...Mold, 4...
...Plow metal, 5...Parison detection device, 6...Molded product, 7...Parison cutter 8...Has a thick wall part parison, 9,1
0,11... Molded product.

Claims (1)

【特許請求の範囲】 １ パリソンを押し出す押出機と、押し出されたパリソ
ンを把持するためブローステーションから押出機のヘッ
ド直下まで移動するブロー成形用金型と、金型に把持さ
れたパリソンを切断するカッターとを有する成形機を用
いてブロー成形により中空成形品を製造する方法に於て
、パリソンの押し出し毎にパリソンの押出速度および金
型の移動開始よりパリソンが切断されるまでの所要時間
を計測し、これらの計測値を用いてパリソンが所定の長
さに達する時刻に金型がパリソンを把持してパリソンを
カッターが切断する様金型の作動を制御することを特徴
とする中空成形品の製造方法。 ２ パリソンがカッターで切断されてから、所定の長さ
に満たないある一定の長さに達するまでの時間を計測す
ることによりパリソンの押出速度を計測する特許請求の
範囲第１項の中空成形品の製造方法。[Scope of Claims] 1. An extruder that extrudes the parison, a blow molding mold that moves from a blow station to just below the head of the extruder to grip the extruded parison, and a blow molding mold that cuts the parison gripped by the mold. In a method of manufacturing hollow molded products by blow molding using a molding machine with a cutter, the extrusion speed of the parison and the time required from the start of movement of the mold until the parison is cut are measured each time the parison is extruded. The hollow molded product is characterized in that, using these measured values, the operation of the mold is controlled so that the mold grips the parison and a cutter cuts the parison at the time when the parison reaches a predetermined length. Production method. 2. The blow molded product of claim 1, wherein the extrusion speed of the parison is measured by measuring the time from when the parison is cut with a cutter until it reaches a certain length that is less than a predetermined length. manufacturing method.
JP57139623A 1982-08-11 1982-08-11 Manufacturing method for hollow molded products Expired JPS5934489B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57139623A JPS5934489B2 (en) 1982-08-11 1982-08-11 Manufacturing method for hollow molded products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57139623A JPS5934489B2 (en) 1982-08-11 1982-08-11 Manufacturing method for hollow molded products

Publications (2)

Publication Number Publication Date
JPS5929131A JPS5929131A (en) 1984-02-16
JPS5934489B2 true JPS5934489B2 (en) 1984-08-23

Family

ID=15249590

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57139623A Expired JPS5934489B2 (en) 1982-08-11 1982-08-11 Manufacturing method for hollow molded products

Country Status (1)

Country Link
JP (1) JPS5934489B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007296650A (en) * 2006-04-27 2007-11-15 Daisho Glass Kk Direct blow molding method of wide-mouthed container

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4520138Y1 (en) * 1967-10-25 1970-08-13
JPS5093245U (en) * 1974-12-27 1975-08-06
JPS5766514U (en) * 1980-10-08 1982-04-21

Also Published As

Publication number Publication date
JPS5929131A (en) 1984-02-16

Similar Documents

Publication Publication Date Title
EP0345474A3 (en) Method and apparatus for the extrusion blow moulding of a hollow article
JP4764565B2 (en) Method for producing hollow body made of thermoplastic plastic, and apparatus for producing the hollow body
GB2178361A (en) Blow moulding
WO1987004113A1 (en) Apparatus and method for the production of ribbed pipes
TWI402156B (en) Method and device for producing a tubular object from thermoplastic material
DE2623342A1 (en) METHOD FOR EXTRUSION BLOWING THERMOPLASTIC HOLLOW BODIES AND GRIPPER DEVICE FOR PULLING THE BLANK INTO THE BLOW MOLD
JPS5934489B2 (en) Manufacturing method for hollow molded products
US4150080A (en) Method for separation of waste material from a moulded article
JP2636040B2 (en) Hollow forming method of flat container having parts with greatly different wall thickness
USRE28600E (en) Extrusion die apparatus
CN114905702A (en) Forming structure and forming method for reducing shrinkage rate during injection molding of amorphous plastic
CA1068061A (en) Plastics extrusion die head improvement
GB1493453A (en) Method and apparatus for manufacturing a hollow plastics article
CA1070074A (en) Method and apparatus for manufacturing a plastic tube blank
CN211917680U (en) Blow mold with dislocation preventing function
JPS5521239A (en) Production method of slender, hollow synthetic resin having irregular curvature
CN116141645B (en) Automatic opening and closing die for hollow blow molding machine
JPH1058530A (en) Blow molding machine
US3289247A (en) Apparatus for forming hollow plastic articles
US4617166A (en) Method for blow molding articles with deeply recessed edges
BG62126B1 (en) Method and device for the production of cast plastic aricles
JPH0367014B2 (en)
JPH04299103A (en) Method and apparatus for controlling wall thickness of parison of blow molding machine
JPH01316234A (en) Molding method for compound material
SU1431951A1 (en) Collapsible mould for extrusion/blow-moulding of articles from thermoplastic material