FR2442126A1 - Controlling crystallisation of injected thermoplastic materials - by the application of different pressure sequences during cooling - Google Patents

Controlling crystallisation of injected thermoplastic materials - by the application of different pressure sequences during cooling

Info

Publication number
FR2442126A1
FR2442126A1 FR7832833A FR7832833A FR2442126A1 FR 2442126 A1 FR2442126 A1 FR 2442126A1 FR 7832833 A FR7832833 A FR 7832833A FR 7832833 A FR7832833 A FR 7832833A FR 2442126 A1 FR2442126 A1 FR 2442126A1
Authority
FR
France
Prior art keywords
pressure
cooling
psi
application
instance
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.)
Withdrawn
Application number
FR7832833A
Other languages
French (fr)
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.)
OI Glass Inc
Original Assignee
Owens Illinois Inc
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 Owens Illinois Inc filed Critical Owens Illinois Inc
Priority to FR7832833A priority Critical patent/FR2442126A1/en
Publication of FR2442126A1 publication Critical patent/FR2442126A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; 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
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

A method for inhibiting or promoting crystallisation in freshly injected thermoplastic material such as polyethylene terephthalate, comprises in the first instance applying a first pressure (P1) during the initial phase of cooling, and then at a predetermined temp. above the Tg, applying a second pressure (P2) much greater than the first until the material has cooled below the Tg and in the second instance cooling the injected material first at a very high pressure (P1) and then as cooling progresses at a series of decreasing pressures (P2) much smaller than the first. By manipulating the pressures as above, in one case the formation of spherulites is inhibited, whilst in the second the formation is promoted. In the first instant (P1) may be 100 psi and (P2) 20,000 psi., and the predetermined temperature is 200-220 degrees C. In the second instance the first pressure is 20,000 psi and the pressure is reduced by about 300 psi for each degree of cooling after the spherulite growth rate has reached its maximum.
FR7832833A 1978-11-21 1978-11-21 Controlling crystallisation of injected thermoplastic materials - by the application of different pressure sequences during cooling Withdrawn FR2442126A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7832833A FR2442126A1 (en) 1978-11-21 1978-11-21 Controlling crystallisation of injected thermoplastic materials - by the application of different pressure sequences during cooling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7832833A FR2442126A1 (en) 1978-11-21 1978-11-21 Controlling crystallisation of injected thermoplastic materials - by the application of different pressure sequences during cooling

Publications (1)

Publication Number Publication Date
FR2442126A1 true FR2442126A1 (en) 1980-06-20

Family

ID=9215133

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7832833A Withdrawn FR2442126A1 (en) 1978-11-21 1978-11-21 Controlling crystallisation of injected thermoplastic materials - by the application of different pressure sequences during cooling

Country Status (1)

Country Link
FR (1) FR2442126A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2529507A1 (en) * 1982-07-05 1984-01-06 Cibie Projecteurs METHOD FOR MANUFACTURING INJECTION-MOLDING SHAPED ARTICLE AND ARTICLE OBTAINED

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR92045E (en) * 1966-04-04 1968-09-13 Dow Chemical Co Injection molding process, apparatus for its implementation and products obtained
FR2102127A1 (en) * 1970-08-07 1972-04-07 Sandoz Sa Hollow moulded crystalline articles - by injection blow moulding a polyethylene terephthalate of specified flow and crystalli

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR92045E (en) * 1966-04-04 1968-09-13 Dow Chemical Co Injection molding process, apparatus for its implementation and products obtained
FR2102127A1 (en) * 1970-08-07 1972-04-07 Sandoz Sa Hollow moulded crystalline articles - by injection blow moulding a polyethylene terephthalate of specified flow and crystalli

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXRV/75-76 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2529507A1 (en) * 1982-07-05 1984-01-06 Cibie Projecteurs METHOD FOR MANUFACTURING INJECTION-MOLDING SHAPED ARTICLE AND ARTICLE OBTAINED

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Legal Events

Date Code Title Description
ST Notification of lapse