JPS5695650A - Controller for extrusionnblow molding - Google Patents

Controller for extrusionnblow molding

Info

Publication number
JPS5695650A
JPS5695650A JP13784580A JP13784580A JPS5695650A JP S5695650 A JPS5695650 A JP S5695650A JP 13784580 A JP13784580 A JP 13784580A JP 13784580 A JP13784580 A JP 13784580A JP S5695650 A JPS5695650 A JP S5695650A
Authority
JP
Japan
Prior art keywords
preform
mold
extrusionnblow
molding
controller
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.)
Granted
Application number
JP13784580A
Other languages
English (en)
Other versions
JPS6353931B2 (ja
Inventor
Daubenbiyutsuhieru Buaanaa
Hetsusu Deiitaa
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.)
Kautex Maschinenbau GmbH
Original Assignee
Kautex Maschinenbau GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6082800&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=JPS5695650(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kautex Maschinenbau GmbH filed Critical Kautex Maschinenbau GmbH
Publication of JPS5695650A publication Critical patent/JPS5695650A/ja
Publication of JPS6353931B2 publication Critical patent/JPS6353931B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D5/00—Control of dimensions of material
    • G05D5/02—Control of dimensions of material of thickness, e.g. of rolled material
    • G05D5/03—Control of dimensions of material of thickness, e.g. of rolled material characterised by the use of electric 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
    • 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
    • B29C48/03—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
    • 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
    • B29C48/25—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
    • 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
    • B29C49/78—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
    • 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
    • B29C49/78—Measuring, controlling or regulating
    • B29C2049/7874—Preform or article shape, weight, defect or presence
    • 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
    • B29C2948/92114—Dimensions
    • B29C2948/92142—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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/9218—Weight
    • 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
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular 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
    • B29C2948/92504—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
    • 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
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92657—Volume or quantity
    • 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
    • B29C2948/92676—Weight
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Artificial Filaments (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
JP13784580A 1979-10-05 1980-10-03 Controller for extrusionnblow molding Granted JPS5695650A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792940418 DE2940418A1 (de) 1979-10-05 1979-10-05 Vorrichtung zur beeinflussung des gewichtes eines im extrusionsblasverfahren hergestellten hohlkoerpers aus thermoplastischem kunststoff

Publications (2)

Publication Number Publication Date
JPS5695650A true JPS5695650A (en) 1981-08-03
JPS6353931B2 JPS6353931B2 (ja) 1988-10-26

Family

ID=6082800

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13784580A Granted JPS5695650A (en) 1979-10-05 1980-10-03 Controller for extrusionnblow molding

Country Status (5)

Country Link
US (1) US4382761A (ja)
EP (1) EP0026828B1 (ja)
JP (1) JPS5695650A (ja)
AT (1) ATE7120T1 (ja)
DE (2) DE2940418A1 (ja)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3304865A1 (de) * 1983-02-12 1984-08-16 Battenfeld Extrusionstechnik GmbH, 4970 Bad Oeynhausen Verfahren und vorrichtung zum konstanthalten der wandstaerke beim extrudieren von blasfolien, rohren oder rohrfoermigen straengen aus kunststoff
IT1211208B (it) * 1987-07-14 1989-10-12 Ages Spa Procedimento per la produzione continua di un profilato estruso avente dimensioni di sezione trasversale varianti in funzione della lunghezza del profilato stesso
DE3809856A1 (de) * 1988-03-24 1989-10-05 Philips Patentverwaltung Blasformmaschine zum blasformen von hohlkoerpern mit wartezeitregelung
DE3809857A1 (de) * 1988-03-24 1989-10-05 Philips Patentverwaltung Blasformmaschine zum blasformen von hohlkoerpern mit polsterregelung
US5256346A (en) * 1988-05-12 1993-10-26 Harald Feuerherm Method of extrusion blow-molding hollow thermoplastic bodies
DE3816273C3 (de) * 1988-05-12 1996-03-21 Harald Feuerherm Verfahren zum Extrusionsblasformen eines Hohlkörpers und Vorrichtung zur Durchführung des Verfahrens
US4877564A (en) * 1988-07-25 1989-10-31 Mobil Oil Corporation Method and apparatus for measuring and controlling blow-up of a foam sheet in a thermoformer oven
US4897230A (en) * 1988-07-25 1990-01-30 Mobil Oil Corp. Method of and apparatus for measuring and controlling blow-up of a foam sheet in a thermoformer oven
DE3922883A1 (de) * 1989-07-12 1991-01-24 Kautex Maschinenbau Gmbh Verfahren und vorrichtung zum herstellen von hohlkoerpern aus thermoplastischem kunststoff
DE3935338A1 (de) * 1989-10-24 1991-05-02 Motech Gmbh Computergestuetzte Verfahren zur gewichtsabhaengigen regelung des grundspaltes an extrusionsblasmaschinen
DE4029023C1 (en) * 1989-10-24 1992-03-12 Motech Gmbh Computergestuetzte Systemloesungen, 6940 Weinheim, De Regulating gap in an extrusion moulding machine - by comparing actual value with threshold value of blank wt., varying width, measuring cycle time and determining material throughput
DE3936301A1 (de) * 1989-11-01 1991-05-02 Kautex Maschinenbau Gmbh Verfahren zum herstellen von hohlkoerpern aus thermoplastischen kunststoff
ATE128406T1 (de) * 1991-10-10 1995-10-15 Motech Gmbh Computergestuetzte Verfahren zur gewichtsabhängigen regelung des grundspaltes an extrusionsblasmaschinen.
US5399302A (en) * 1991-12-27 1995-03-21 Kao Corpoation Parison length control method for blow molding machine
DE4224514A1 (de) * 1992-07-24 1994-01-27 Wilhelm Hegler Vorrichtung zum Herstellen eines Kunststoff-Rohres mit Querprofilierung
US5718852A (en) * 1994-05-10 1998-02-17 The Clorox Company Process controlling a blow molding machine
ES2161801T3 (es) 1994-06-03 2001-12-16 Harald Feuerherm Procedimiento para el moldeado por extrusion y soplado de piezas huecas de material sintetico termoplastico.
DE4421171C1 (de) 1994-06-20 1996-01-04 Harald Feuerherm Verfahren zum Extrusionsblasformen von Hohlkörpern aus thermoplastischem Kunststoff
DE4419460C1 (de) * 1994-06-03 1995-05-11 Harald Feuerherm Verfahren zum Extrusionsblasformen von Hohlkörpern aus termoplastischem Kunststoff
DE19813668C2 (de) * 1998-03-27 2003-04-30 Ossberger Gmbh & Co Herstellvorrichtung mit Kontrolleinrichtungen für einen Kunststoff-Hohlkörper
US6441321B1 (en) * 2000-06-02 2002-08-27 Creative Automation, Inc. Method for controlling weight of divided portions
EP1378336A1 (en) * 2002-07-02 2004-01-07 ATOFINA Research Polymer processability evaluation through on-line processing
KR101949661B1 (ko) * 2011-09-06 2019-02-19 코허-플라스틱 마쉬넨바우 게엠베하 용기 제품의 지정된 특성들의 존재를 설정하기 위한 방법 및 상기 방법을 수행하기 위한 디바이스
WO2013034255A2 (de) * 2011-09-06 2013-03-14 Kocher-Plastik Maschinenbau Gmbh Verfahren zur feststellung des vorliegens von vorgegebenen eigenschaften eines behältererzeugnisses und vorrichtung zur durchführung des verfahrens
US10098355B2 (en) 2014-11-19 2018-10-16 Bakery Systems, Inc. System and method for weighing items

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5084779A (ja) * 1973-12-03 1975-07-08

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1704791B2 (de) * 1968-03-18 1976-07-29 Kautex Werke Reinold Hagen Gmbh, 5300 Bonn-Holzlar Vorrichtung zum herstellen von im querschnitt ringfoermigen koerpern aus thermoplastischem kunststoff
BE731522A (ja) * 1968-04-26 1969-09-15
US3795719A (en) * 1971-09-09 1974-03-05 Baychem Corp Method of controlling the blow molding of hollow shaped plastic articles
US3759648A (en) * 1971-09-15 1973-09-18 Hunker Instr Dev Labor Inc Extruder control system
DE2261225A1 (de) * 1972-12-14 1974-06-27 4 P Verpackungen Gmbh Verfahren und vorrichtung zur herstellung von formlingen aus thermoplasten
US3943214A (en) * 1974-08-08 1976-03-09 Monsanto Company Method improvements for controlling parison length
DE2544171C3 (de) * 1975-10-03 1978-10-26 Kautex Werke Reinold Hagen Gmbh, 5300 Bonn-Holzlar Vorrichtung zum Steuern der Bewegung der Blasform und der Teile derselben beim Herstellen von Hohlkörpern aus thermoplastischem Kunststoff
DE2544609C3 (de) * 1975-10-06 1984-11-08 Kautex Werke Reinold Hagen Gmbh, 5300 Bonn Einrichtung zum Beeinflussen der Länge eines Vorformlings aus thermoplastischem Kunststoff
DE2608551A1 (de) * 1976-03-02 1977-09-08 Peddinghaus Rolf Verfahren und einrichtung zum herstellen von gewichts- oder volumengenauen halbzeug-, insbesondere knueppelabschnitten fuer kalt- oder warmverformung
US4088721A (en) * 1976-09-24 1978-05-09 The Goodyear Tire & Rubber Company Method and apparatus for controlling the thickness of extruded stock
US4097566A (en) * 1977-06-01 1978-06-27 Nucleonics Data Systems Extrusion line control system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5084779A (ja) * 1973-12-03 1975-07-08

Also Published As

Publication number Publication date
DE3067545D1 (en) 1984-05-24
JPS6353931B2 (ja) 1988-10-26
EP0026828A1 (de) 1981-04-15
DE2940418A1 (de) 1981-04-16
ATE7120T1 (de) 1984-05-15
US4382761A (en) 1983-05-10
EP0026828B1 (de) 1984-04-18

Similar Documents

Publication Publication Date Title
JPS5695650A (en) Controller for extrusionnblow molding
GB2074496B (en) Installation for the manufacture of hollow bodies by thermal treatment and then blowing of preforms of plastics material
GB1387806A (en) Method of and apparatus for blow moulding plastics containers
EP0345474A3 (de) Verfahren und Vorrichtung zum Extrusionsblasformen eines Hohlkörpers
ES445287A1 (es) Procedimiento de fabricacion de cuerpos huecos de material termoplastico.
ES8202722A1 (es) Procedimiento para la fabricacion de cuerpos huecos
SE8602466L (sv) Blasformingsmetod
ES2179144T3 (es) Procedimiento para moldear por soplado cuerpos huecos de material termoplastico.
GB1200794A (en) Container forming method and apparatus
JPS52144060A (en) Hollow thermoplastic article extrusion blow molding method and device for trapping parison into blow molding mold
GB953652A (en) Improvements in or relating to methods and apparatus for trimming flash from hollow plastic articles
JPS5525380A (en) Method of molding hollow molded article inserted with predetermined parts internally
GB747434A (en) Improvements in or relating to the production of hollow bodies from organic plastic materials
GB1060399A (en) Method and apparatus of manufacturing a hollow moulded article
ES8607105A1 (es) Una unidad para producir un cuerpo hueco por extrusion y soplado de material plastico
JPS5695659A (en) Production of head rest or the like
JPS5569423A (en) Production of hollow molding having thermal insulator on surface
JPS57201632A (en) Manufacture of blow molded article
DE59509654D1 (de) Verfahren zum Extrusionsblasformen von Hohlkörpern aus thermoplastischem Kunststoff
GB1493453A (en) Method and apparatus for manufacturing a hollow plastics article
SE8403166L (sv) Sett och anordning for att tillverka en ihalig plastprodukt med olika diametrar
GB1114270A (en) Improvements in the process for production of blown hollow bodies from soft polyethylene
JPS5477668A (en) Blow molding of plastic product with flat body
JPS5569422A (en) Parison control method
GB1461758A (en) Apparatus for fabricating hollow articles from thermoplastics material