GB744895A - Improvements in the extrusion-moulding of plastics - Google Patents

Improvements in the extrusion-moulding of plastics

Info

Publication number
GB744895A
GB744895A GB23743/51A GB2374351A GB744895A GB 744895 A GB744895 A GB 744895A GB 23743/51 A GB23743/51 A GB 23743/51A GB 2374351 A GB2374351 A GB 2374351A GB 744895 A GB744895 A GB 744895A
Authority
GB
United Kingdom
Prior art keywords
tube
die
core
extruder
mould
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
GB23743/51A
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.)
Injection Molding Co
Original Assignee
Injection Molding Co
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 Injection Molding Co filed Critical Injection Molding Co
Publication of GB744895A publication Critical patent/GB744895A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/695Flow dividers, e.g. breaker plates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion 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
    • B29C48/09Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/30Extrusion nozzles or dies
    • B29C48/32Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/325Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles being adjustable, i.e. having adjustable exit sections
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/30Extrusion nozzles or dies
    • B29C48/32Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/335Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/30Extrusion nozzles or dies
    • B29C48/32Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion 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
    • B29C48/09Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/30Extrusion nozzles or dies
    • B29C48/32Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/30Extrusion nozzles or dies
    • B29C48/345Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

744,895. Extrusion machines, e.g. for blowmoulding containers. INJECTION MOLDING CO. Oct. 11, 1951 [Oct. 19, 1950], No. 23743/51. Class 87 (2). [Also in Group XVII] A machine for moulding containers or other articles comprises a plurality of die heads 21, 22, Fig. 1, and an extruder 11 having a plurality of outlet ducts connected with the die heads by means of valves 23 and 24 and passages 14, 15. The extruder is screw-operated, and by feeding each die head in turn the screw can be kept turning continuously. Thus, the valve 23 may be closed, the extruder supplying only the die head 21 through valve 24 and passage 15; then the valve 24 may be closed and valve 23 opened, whereby die head 22 is supplied via passage 14. 'As shown, there is a second extruder 12 similarly connected to the die heads through valves 25, 26 and passages 17, 18, and the two screws turn continuously together to supply each die head from both sides, each die head being supplied in turn. The valves 23 ... 26 are controlled by a timer 40a via air pressure tubes 23a, 24a, 25a, 26a. The plastic delivered by extruder 12 may differ in colour or type from that delivered by extruder 11; thus, the extruder 11 alone may first supply plastic to a die-head to form the lower part of a container, and then the extruder 12 alone may supply plastic of a different type to form the upper part of the container. More than two extruders may be used. The invention is described in connection with the blow-moulding of containers, which may be filled during moulding. Fig. 2 shows the die 22 in association with a two-part mould 42, 43. The die includes a central core 32 and a nozzle 39 formed of a plurality of rings, and the material may be extruded in tubular form between these two parts. The thickness of the extruded tube may be altered by raising or lowering the core 32, this being effected by movement of a rack 54 meshing with a nut 51 threaded on the core, the core being constrained to move vertically by a spline 35. A spring 56 tends to hold the core up. In operation a tube is extruded between the open mould halves, the halves close on the tube to seal the end of the tube, and compressed air is blown into the tube through conduits 40 and 37 to expand the tube against the mould walls. In a modified method the core is raised to such a height that a solid mass of material is extruded to form the base of the container, then the core is lowered to form a tube, then the tube is blown. The movement of the core may be such as to produce a tube of the form shown in dotted lines in Fig. 2, this tube having thickened central portions 44 which are thinned by subsequent blowing. The movement of the rack is controlled by pneumatic, hydraulic or electrical mechanism in synchronism with the operation of valve. 23 and the opening and closing of the mould halves 42, 43. A transparent printed sheet 91 may be applied to the article by. initially placing it on the wall of the mould or in a recess in the wall. A modified die is described, Fig. 3 (not shown, in which a tube extends through the compressed air conduit 37, this tube being used to fill the blown container with liquid; the mould is then opened and the upper end of the container sealed by a solid slug of plastic or by twisting or welding. Fig. 4 shows another modified die in which the movement of the core is effected by a cam 262 and spring 256. Reference has been directed by the Controller to Specification 700,984, [Group XVII].
GB23743/51A 1950-10-19 1951-10-11 Improvements in the extrusion-moulding of plastics Expired GB744895A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US744895XA 1950-10-19 1950-10-19

Publications (1)

Publication Number Publication Date
GB744895A true GB744895A (en) 1956-02-15

Family

ID=22119829

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23743/51A Expired GB744895A (en) 1950-10-19 1951-10-11 Improvements in the extrusion-moulding of plastics

Country Status (1)

Country Link
GB (1) GB744895A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178197B (en) * 1959-03-05 1964-09-17 Metal Box Co Ltd Method and device for extrusion of a tubular intermediate product made of thermoplastic material and having different wall thicknesses over its length
DE1207606B (en) * 1961-08-03 1965-12-23 Rastatter Kunststoffwerk G M B Device for pressing out a hose of different wall thicknesses from thermoplastics
CN107635744A (en) * 2015-04-30 2018-01-26 帝斯克玛股份有限公司 Liquid blow molding apparatus and liquid blow molding method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178197B (en) * 1959-03-05 1964-09-17 Metal Box Co Ltd Method and device for extrusion of a tubular intermediate product made of thermoplastic material and having different wall thicknesses over its length
DE1207606B (en) * 1961-08-03 1965-12-23 Rastatter Kunststoffwerk G M B Device for pressing out a hose of different wall thicknesses from thermoplastics
CN107635744A (en) * 2015-04-30 2018-01-26 帝斯克玛股份有限公司 Liquid blow molding apparatus and liquid blow molding method

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