FR2360408A1 - Continuously prefoaming expandable plastics - by preheating and treating in rising hot gas stream (NL 6.2.78) - Google Patents
Continuously prefoaming expandable plastics - by preheating and treating in rising hot gas stream (NL 6.2.78)Info
- Publication number
- FR2360408A1 FR2360408A1 FR7623567A FR7623567A FR2360408A1 FR 2360408 A1 FR2360408 A1 FR 2360408A1 FR 7623567 A FR7623567 A FR 7623567A FR 7623567 A FR7623567 A FR 7623567A FR 2360408 A1 FR2360408 A1 FR 2360408A1
- Authority
- FR
- France
- Prior art keywords
- hot gas
- beads
- preheating
- treating
- continuously
- 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.)
- Granted
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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3461—Making or treating expandable particles
Abstract
Prefoaming of expandable plastics, e.g. polystyrene, in bead form by pre-heating and then subjecting them to an ascending ring-shaped stream of hot gas, the temp. and flow rate of which is controlled to lift and move the beads, and heat them to their softening temp. The pre-expanded beads are used directly for moulding, without intermediate storage for drying or re-absorption of gas . Pre-expanded beads of good quality, with wt. of 8-25 kg/m2 and ready for immediate use, are obtd. by a simple continuous process. MAterial loss by handling is reduced, and the beads are smoother and stronger than those of equal density expanded in steam.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7623567A FR2360408A1 (en) | 1976-08-02 | 1976-08-02 | Continuously prefoaming expandable plastics - by preheating and treating in rising hot gas stream (NL 6.2.78) |
GB3115077A GB1560768A (en) | 1976-08-02 | 1977-07-25 | Prefoaming process for expansible materials |
CS506877A CS200522B2 (en) | 1976-08-02 | 1977-08-01 | Method of previous foaming the balls from expandable plastic materils and device for making the same |
JP9245777A JPS5317663A (en) | 1976-08-02 | 1977-08-01 | Process and device for preliminary foaming of expandable plastic material |
ES461248A ES461248A1 (en) | 1976-08-02 | 1977-08-01 | Prefoaming process for expansible materials |
IT6878077A IT1083447B (en) | 1976-08-02 | 1977-08-01 | PROCEDURE AND DEVICE FOR THE PRESCHIUMATURA OF THE EXPANDABLE PLASTIC MATERIALS |
NL7708504A NL7708504A (en) | 1976-08-02 | 1977-08-01 | METHOD AND DEVICE FOR PRE-FOAMING EXPAN-PERMANIBLE PLASTICS. |
PL20000077A PL200000A1 (en) | 1976-08-02 | 1977-08-01 | METHOD AND DEVICE FOR FROSTING PLASTIC VARIABLE MATERIALS, ESPECIALLY OF STYRENE COPOLYMERS |
SU772507514A SU680628A3 (en) | 1976-08-02 | 1977-08-02 | Method and apparatus for manufacturing articles from foam plastic |
DE19772734834 DE2734834A1 (en) | 1976-08-02 | 1977-08-02 | METHOD AND DEVICE FOR PRE-FOAMING EXTENSIBLE PLASTICS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7623567A FR2360408A1 (en) | 1976-08-02 | 1976-08-02 | Continuously prefoaming expandable plastics - by preheating and treating in rising hot gas stream (NL 6.2.78) |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2360408A1 true FR2360408A1 (en) | 1978-03-03 |
FR2360408B1 FR2360408B1 (en) | 1979-03-02 |
Family
ID=9176458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7623567A Granted FR2360408A1 (en) | 1976-08-02 | 1976-08-02 | Continuously prefoaming expandable plastics - by preheating and treating in rising hot gas stream (NL 6.2.78) |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2360408A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2497814A1 (en) * | 1981-01-13 | 1982-07-16 | Gerard Aye | Producing expanded polystyrene beads with shock fused surfaces - to eliminate extended maturation periods |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3252228A (en) * | 1962-04-23 | 1966-05-24 | Lodge & Shipley Co | Expander for polymeric material |
-
1976
- 1976-08-02 FR FR7623567A patent/FR2360408A1/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3252228A (en) * | 1962-04-23 | 1966-05-24 | Lodge & Shipley Co | Expander for polymeric material |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2497814A1 (en) * | 1981-01-13 | 1982-07-16 | Gerard Aye | Producing expanded polystyrene beads with shock fused surfaces - to eliminate extended maturation periods |
Also Published As
Publication number | Publication date |
---|---|
FR2360408B1 (en) | 1979-03-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
GC | Lien (pledge) constituted | ||
TP | Transmission of property | ||
ST | Notification of lapse | ||
AR | Application made for restoration | ||
CL | Concession to grant licences | ||
BR | Restoration of rights | ||
ST | Notification of lapse |