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NL7701816A - Extrusion of plastic pipe - using temp. variation of extruded pipe to automatically control wall thickness - Google Patents

Extrusion of plastic pipe - using temp. variation of extruded pipe to automatically control wall thickness

Info

Publication number
NL7701816A
NL7701816A NL7701816A NL7701816A NL7701816A NL 7701816 A NL7701816 A NL 7701816A NL 7701816 A NL7701816 A NL 7701816A NL 7701816 A NL7701816 A NL 7701816A NL 7701816 A NL7701816 A NL 7701816A
Authority
NL
Netherlands
Prior art keywords
pipe
temp
extruded
variation
wall thickness
Prior art date
Application number
NL7701816A
Other languages
Dutch (nl)
Original Assignee
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 Wavin Bv filed Critical Wavin Bv
Priority to NL7701816A priority Critical patent/NL7701816A/en
Publication of NL7701816A publication Critical patent/NL7701816A/en

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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • 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
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • 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
    • B29C2948/92114—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
    • B29C2948/92323—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
    • B29C2948/92647—Thickness

Landscapes

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

Abstract

An extrusion process is described in which the variation in cooling of an extruded plastic pipe due to variations in wall thickness is measured and the measurement is used to control the extrusion process. The pipe is extruded through a nozzle, passes through a cooler in which an even flow of coolant around the walls of the pipe is guaranteed and thence through a measuring ring. As more heat is retained in thicker wall sections than in the thinner sections, the pipe surface at the thicker section will recover to a higher temp. than that at the thinner section. The variations in temp. are detected by series thermocouples around the circumference of the pipe. The signals transmitted are used to increase or reduce the feed rate and to position the central former of the nozzle. Existing methods for attaining correct and even wall thicknesses in extruded plastic tubes are complex and expensive. This process is simple but still enables an accurate tube to be formed so that the minimum of material is used.
NL7701816A 1977-02-21 1977-02-21 Extrusion of plastic pipe - using temp. variation of extruded pipe to automatically control wall thickness NL7701816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL7701816A NL7701816A (en) 1977-02-21 1977-02-21 Extrusion of plastic pipe - using temp. variation of extruded pipe to automatically control wall thickness

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7701816A NL7701816A (en) 1977-02-21 1977-02-21 Extrusion of plastic pipe - using temp. variation of extruded pipe to automatically control wall thickness

Publications (1)

Publication Number Publication Date
NL7701816A true NL7701816A (en) 1978-08-23

Family

ID=19828019

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7701816A NL7701816A (en) 1977-02-21 1977-02-21 Extrusion of plastic pipe - using temp. variation of extruded pipe to automatically control wall thickness

Country Status (1)

Country Link
NL (1) NL7701816A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711747A (en) * 1985-05-21 1987-12-08 Reifenhauser Gmbh & Co. Method of producing blown thermoplastic foil with low thickness tolerances
EP1749638A1 (en) * 2005-08-03 2007-02-07 Zumbach Electronic Ag Device for measuring the thickness of extruded tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711747A (en) * 1985-05-21 1987-12-08 Reifenhauser Gmbh & Co. Method of producing blown thermoplastic foil with low thickness tolerances
EP1749638A1 (en) * 2005-08-03 2007-02-07 Zumbach Electronic Ag Device for measuring the thickness of extruded tubes

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Legal Events

Date Code Title Description
BV The patent application has lapsed