ES374058A1 - Improved method for extruding difficult-to-process polymers - Google Patents

Improved method for extruding difficult-to-process polymers

Info

Publication number
ES374058A1
ES374058A1 ES374058A ES374058A ES374058A1 ES 374058 A1 ES374058 A1 ES 374058A1 ES 374058 A ES374058 A ES 374058A ES 374058 A ES374058 A ES 374058A ES 374058 A1 ES374058 A1 ES 374058A1
Authority
ES
Spain
Prior art keywords
molecular weight
polymer
die
weight greater
screw
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
ES374058A
Other languages
Spanish (es)
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.)
Sunoco Inc
Original Assignee
Sun Oil 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 Sun Oil Co filed Critical Sun Oil Co
Publication of ES374058A1 publication Critical patent/ES374058A1/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
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/33—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles with parts rotatable relative to each other
    • 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
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/832—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
    • B29C48/78—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
    • B29C48/03—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

Landscapes

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

Abstract

In the extrusion moulding of rods or tubes of high molecular weight thermoplastic polymers, i.e. polymers having no measurable melt index under the conditions of ASTM Method D 1238-65T, such a polymer is transported to the die of the extruder as discrete particles at a temperature below the melting point of the polymer, the polymer is heated and fused under pressure within the die to form a homogeneous molten mass at a temperature below the thermal degradation temperature of the polymer and subsequently, prior to extrusion, the polymer is cooled to a temperature below the melting point of the polymer. The polymers listed as having no measurable melt index under theabovementioned test conditions are polyethylene of molecular weight greater than 500,000, polypropylene of molecular weight greater than 400,000, polystyrene of molecular weight greater than 50,000, a polyester of molecular weight greater than 70,000, a polyamide of molecular weight greater than 90,000 and PVC of molecular weight greater than 50,000. The extrusion apparatus, which as shown forms a tubular extrudate 26, comprises up to the vicinity of the die 29 a screw 22 of constant diameter core, a heater 27 and a cooler 28, the screw preferably being chromium plated and the die being preferably chromium plated or coated with a fluorocarbon polymer. Some heating is effected by the mechanical work on the particles by the screw, but the particles are not melted prior to entry into die 29. The compression ratio between the screw and die is preferably within the range 0À2-0À9. Various tables of results are given.
ES374058A 1968-11-20 1969-11-19 Improved method for extruding difficult-to-process polymers Expired ES374058A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77740668A 1968-11-20 1968-11-20

Publications (1)

Publication Number Publication Date
ES374058A1 true ES374058A1 (en) 1972-02-16

Family

ID=25110169

Family Applications (1)

Application Number Title Priority Date Filing Date
ES374058A Expired ES374058A1 (en) 1968-11-20 1969-11-19 Improved method for extruding difficult-to-process polymers

Country Status (9)

Country Link
AT (1) AT316111B (en)
BE (1) BE741942A (en)
BR (1) BR6914139D0 (en)
DE (1) DE1955720A1 (en)
ES (1) ES374058A1 (en)
FR (1) FR2023703A1 (en)
GB (1) GB1248642A (en)
NL (1) NL6916631A (en)
SE (1) SE374306B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU8973882A (en) * 1981-10-29 1983-05-05 Union Carbide Corporation Polyethylene extrusion
NO173690C (en) * 1983-03-29 1994-01-19 Mitsui Toatsu Chemicals Procedure for producing tubes by extrusion molding of a thermosetting resin
DD230826A1 (en) * 1984-03-05 1985-12-11 Univ Dresden Tech METHOD AND EXTRUSION DEVICE FOR FORMING FLOW-PROOF MASSES
GB9019217D0 (en) * 1990-08-23 1990-10-17 Atomic Energy Authority Uk Plastics extrusion
FR2832667B1 (en) * 2001-11-27 2006-10-13 Claude Ailleau PROCESS AND INSTALLATION FOR MANUFACTURING POROUS PARTS THROUGH AGGLOMERATION OF PELLETS IN THERMOPLASTIC MATERIAL
CN115158997B (en) * 2022-07-16 2023-09-12 西安强盛耐磨机械有限公司 Double-metal liquid composite casting spiral auger and manufacturing method thereof

Also Published As

Publication number Publication date
BR6914139D0 (en) 1973-01-11
FR2023703A1 (en) 1970-08-21
SE374306B (en) 1975-03-03
AT316111B (en) 1974-06-25
GB1248642A (en) 1971-10-06
BE741942A (en) 1970-05-19
NL6916631A (en) 1970-05-22
DE1955720A1 (en) 1970-06-11

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