GB1396538A - Method and device for adjusting the wall thickness of plastics articles - Google Patents

Method and device for adjusting the wall thickness of plastics articles

Info

Publication number
GB1396538A
GB1396538A GB3243272A GB3243272A GB1396538A GB 1396538 A GB1396538 A GB 1396538A GB 3243272 A GB3243272 A GB 3243272A GB 3243272 A GB3243272 A GB 3243272A GB 1396538 A GB1396538 A GB 1396538A
Authority
GB
United Kingdom
Prior art keywords
switches
tube
opened
wall thickness
thickness
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
GB3243272A
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.)
Industriele Onderneming Wavin NV
Wavin BV
Original Assignee
Industriele Onderneming Wavin NV
Wavin BV
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 Industriele Onderneming Wavin NV, Wavin BV filed Critical Industriele Onderneming Wavin NV
Publication of GB1396538A publication Critical patent/GB1396538A/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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/87—Cooling
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the 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
    • 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
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
    • B29C48/865—Heating
    • 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
    • B29C2948/92085—Velocity
    • B29C2948/92095—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
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92152—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
    • B29C2948/92009—Measured parameter
    • B29C2948/92209—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92952—Drive section, e.g. gearbox, motor or drive fluids
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

1396538 Controlling extruded tube wall thickness INDUSTRIELE ONDERNEMING WAVIN NV 11 July 1972 [16 July 1971] 32432/72 Heading B5A [Also in Division G3] The wall thickness of an extruded plastics tube is controlled by selectively switching auxiliary heaters around the circumference of the extruder head in response to devices which sense the thickness at corresponding points around the tube. The sensors 10 comprise twelve equally spaced switches, each consisting of a flat metal plate guided in a plastics support and urged outwards against the extruded tube within a sizing die 9 by an air filled "balloon". Each plate has projections at both ends which complete a circuit through "fixed contacts" when the thickness is a desired minimum. Short term fluctuations are ignored because these influence the contacts at one end only of each plate at a time. The heaters are in the form of plugs 26 in the extruder casing 3 and/or wires embedded in slots in both the casing and the core 2, and each is turned off (by a relay) when its corresponding switch is opened. Opening of a switch also causes cooling air to pass through a corresponding channel 30 for a finite time, e.g. 10 seconds, determined by a single timer. This arrangement is to eliminate eccentricity, which results in a number of switches being opened in sequence; the single timer shuts all the air ducts off together and thus the sector whose switch opened first receives cooling air for the longest time. Four switches at 90 degrees to each other also control a motor drive (Fig. 8, not shown) which draws the extruded tube. Initially, this drive gradually decelerates, causing thickening of the tube wall; when this is detected by simultaneous opening of the four spaced switches a servomotor causes the drive to gradually accelerate until the four switches again close and the cycle is repeated.
GB3243272A 1971-07-16 1972-07-11 Method and device for adjusting the wall thickness of plastics articles Expired GB1396538A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7109900A NL7109900A (en) 1971-07-16 1971-07-16

Publications (1)

Publication Number Publication Date
GB1396538A true GB1396538A (en) 1975-06-04

Family

ID=19813634

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3243272A Expired GB1396538A (en) 1971-07-16 1972-07-11 Method and device for adjusting the wall thickness of plastics articles

Country Status (3)

Country Link
DE (1) DE2234876A1 (en)
GB (1) GB1396538A (en)
NL (1) NL7109900A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674440A (en) * 1995-05-05 1997-10-07 Graham Engineering Corporation Die head with adjustable mandrel and method
CN103492154A (en) * 2011-04-18 2014-01-01 格瑞纳模具技术股份有限公司 Extrusion device and method for influencing wall thicknesses of an extruded plastic profile

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2553069C3 (en) * 1974-11-27 1981-05-27 Teijin Ltd., Osaka Slot nozzle for producing a polymer film of uniform thickness
CA1068061A (en) * 1975-07-28 1979-12-18 Thomas J. Bond Plastics extrusion die head improvement
DE2706085C2 (en) * 1977-02-12 1984-02-02 Reifenhäuser KG, 5210 Troisdorf Device for extruding pipes made of thermoplastic material
DE3014989C2 (en) * 1980-04-18 1991-01-24 Windmöller & Hölscher, 4540 Lengerich Method for controlling the film thickness on a blown film extruder
US4332543A (en) * 1980-09-15 1982-06-01 Monsanto Company Extrusion die with melt flow control
US4548570A (en) * 1983-05-12 1985-10-22 Cosden Technology, Inc. Extrusion apparatus for producing thermoplastic pipe
US4512943A (en) * 1983-05-20 1985-04-23 Cosden Technology, Inc. Extrusion process for producing thermoplastic pipe
NL8304451A (en) * 1983-12-27 1985-07-16 Wavin Bv METHOD AND APPARATUS FOR CONTROLLING THE WALL THICKNESS OF EXTRUDED PLASTIC TUBE.
EP0180571A3 (en) * 1984-09-11 1986-11-26 Erwin Hartl Extrusion die arrangement and automatic centering extrusion method
US4882104A (en) * 1987-04-03 1989-11-21 Cincinnati Milacron, Inc. Method of controlling the thickness of an extruded plastic article
AT401031B (en) * 1988-11-18 1996-05-28 Cincinnati Milacron Austria DEVICE FOR REGULATING THE WALL THICKNESS
DE9301353U1 (en) * 1992-10-28 1993-12-16 Windmoeller & Hoelscher Foil die head
DE102006039553A1 (en) * 2006-08-23 2008-02-28 Groß, Heinz, Dr. Ing. Targeted determination of exact position of a point on a surface of a component integrated into a unit or unit component relative to a defined point in the unit, by mounting distance sensor in an exactly defined position within the unit
DE102012208677B4 (en) * 2012-05-23 2018-08-02 Battenfeld-Cincinnati Germany Gmbh Method and device for tempering plastic plastic material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674440A (en) * 1995-05-05 1997-10-07 Graham Engineering Corporation Die head with adjustable mandrel and method
CN103492154A (en) * 2011-04-18 2014-01-01 格瑞纳模具技术股份有限公司 Extrusion device and method for influencing wall thicknesses of an extruded plastic profile
CN103492154B (en) * 2011-04-18 2016-01-27 格瑞纳模具技术股份有限公司 For the extrusion device that has an impact to the wall thickness of the plastic material extruded and method
US9636861B2 (en) 2011-04-18 2017-05-02 Greiner Tool.Tec Gmbh Extrusion device and method for influencing wall thicknesses of an extruded plastic profile

Also Published As

Publication number Publication date
DE2234876A1 (en) 1973-01-25
NL7109900A (en) 1973-01-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees