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 coolingInfo
- 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- Withdrawn
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.
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)
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)
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 |
-
1978
- 1978-11-21 FR FR7832833A patent/FR2442126A1/en not_active Withdrawn
Patent Citations (2)
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)
Title |
---|
EXRV/75-76 * |
Cited By (1)
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 |