GB1349301A - Method of continuously forming moulded foamed bodies and apparatus therefor - Google Patents
Method of continuously forming moulded foamed bodies and apparatus thereforInfo
- Publication number
- GB1349301A GB1349301A GB1797571A GB1797571A GB1349301A GB 1349301 A GB1349301 A GB 1349301A GB 1797571 A GB1797571 A GB 1797571A GB 1797571 A GB1797571 A GB 1797571A GB 1349301 A GB1349301 A GB 1349301A
- Authority
- GB
- United Kingdom
- Prior art keywords
- moulding
- foam
- foamed
- elements
- moulded
- 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
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
- B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
- B29C44/30—Expanding the moulding material between endless belts or rollers
-
- 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
- B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
- B29C44/22—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length consisting of at least two parts of chemically or physically different materials, e.g. having different densities
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
1349301 Extruding foamed materials COSDEN OIL & CHEMICAL CO 28 May 1971 [8 June 1970] 17975/71 Heading B5A [Also in Division C3] An apparatus for continuously forming moulded foamed bodies from a thermoplastic polymer, comprises an extruder having a mixing chamber with means for mixing thermoplastic polymer and a foaming agent and extruding the mixture therefrom, means for heating the mixing chamber, means for introducing a foaming agent into the heated mixture in said chamber, and an outlet nozzle through which the mixture can be extruded to expand as a foamed extrudate, the apparatus further comprising a moulding device comprising upper and lower moulding elements spaced apart, the outlet nozzle being positioned between the moulding elements so as to be able to receive the extruded foam, means for actuating the moulding elements to compress the foam between the moulding elements to form a compressed moulded foamed product, and means for cooling the moulding elements to set the thermoplastic foam therebetween in its compressed moulded shape. Moulded foamed bodies, are continuously made by heating and extruding a mixture of a thermoplastic polymer with a foaming agent to form a homogeneous plastic foam by expanding the foam directly into a moulding device and then compressing the extruded softened plastic foam between moulding surfaces to continuously shape the foam to the desired form and density while retaining its foamy internal structure, and then finally cooling to set the moulded thermoplastic polymer while it is between the mould surfaces. Figs. 1-3 show a track moulding device and a track mould respectively in which polymer particles are fed via 10 to chamber 13 where they are foamed by means of foaming agent fed under pressure from 24 and extruded from nozzle 26 as sheet 28 which is passed between track mould having moulding elements 30, 32 mounted on continuous belts 34, 36. Refrigerant is fed via 50 and withdrawn at 52 to cool jacket 48, and elements 30, 32 may be heated by 54, e.g. with steam. Sheet 28 can be cut into sections 29 by die 62.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4443370A | 1970-06-08 | 1970-06-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1349301A true GB1349301A (en) | 1974-04-03 |
Family
ID=21932360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1797571A Expired GB1349301A (en) | 1970-06-08 | 1971-05-28 | Method of continuously forming moulded foamed bodies and apparatus therefor |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE768168A (en) |
| FR (1) | FR2094111B1 (en) |
| GB (1) | GB1349301A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1175296A1 (en) * | 2000-02-03 | 2002-01-30 | Pactiv Corporation | Polymer foam plank with densified skin, method and apparatus for producing the same |
| CN113352533A (en) * | 2021-04-25 | 2021-09-07 | 章明 | Demoulding method for trimming latex mattress before demoulding |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2529826A1 (en) * | 1982-07-09 | 1984-01-13 | Elf Isolation | Continuous process for the moulding of panels or of cellular plates from pre-expanded granules of thermoplastic material and device for the implementation of the said process. |
-
1971
- 1971-05-28 GB GB1797571A patent/GB1349301A/en not_active Expired
- 1971-06-07 BE BE768168A patent/BE768168A/en unknown
- 1971-06-08 FR FR7120662A patent/FR2094111B1/fr not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1175296A1 (en) * | 2000-02-03 | 2002-01-30 | Pactiv Corporation | Polymer foam plank with densified skin, method and apparatus for producing the same |
| EP1175296A4 (en) * | 2000-02-03 | 2004-05-12 | Pactiv Corp | Polymer foam plank with densified skin, method and apparatus for producing the same |
| US7201958B2 (en) | 2000-02-03 | 2007-04-10 | Pregis Innovative Packaging Inc. | Polymer foam plank with densified skin, method and apparatus for producing a densified skin on a foam plank |
| CN113352533A (en) * | 2021-04-25 | 2021-09-07 | 章明 | Demoulding method for trimming latex mattress before demoulding |
Also Published As
| Publication number | Publication date |
|---|---|
| BE768168A (en) | 1971-11-03 |
| FR2094111A1 (en) | 1972-02-04 |
| FR2094111B1 (en) | 1975-02-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLE | Entries relating assignments, transmissions, licences in the register of patents | ||
| PCNP | Patent ceased through non-payment of renewal fee |