GB866299A - Method and apparatus for the manufacture of flexible sheets of heat cured foamed material - Google Patents
Method and apparatus for the manufacture of flexible sheets of heat cured foamed materialInfo
- Publication number
- GB866299A GB866299A GB38892/59A GB3889259A GB866299A GB 866299 A GB866299 A GB 866299A GB 38892/59 A GB38892/59 A GB 38892/59A GB 3889259 A GB3889259 A GB 3889259A GB 866299 A GB866299 A GB 866299A
- Authority
- GB
- United Kingdom
- Prior art keywords
- foam
- rim
- projections
- foamed material
- manufacture
- 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
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
- B29C44/583—Moulds for making articles with cavities
-
- 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
- B29C44/3415—Heating or 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/12—Dielectric heating
-
- 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
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
Foam rubber sheets are made using the apparatus of the parent Specification modified in that the projections on the former are of electrically conductive material instead of electrically insulating material. The electrostatic field set up by the high frequency source extends between the free ends of the projections and the electrode, thus raising the temperature of the portion of the foamed material overlying the projections. This overlying portion will gel first and stabilise the foam on the drum, thus preventing substantial movement of the foam relative to the drum surface. The rim on the former may also be electrically conductive, this distorting the electrostatic field, however, with the result that the depth of the foam within the field, and heated dielectrically thereby, becomes less the nearer the foam is to the rim and is zero at the rim. Under some circumstances this lack of rapid gelling at the edges of the material is acceptable.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR866299X | 1958-11-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB866299A true GB866299A (en) | 1961-04-26 |
Family
ID=9344846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB38892/59A Expired GB866299A (en) | 1958-11-27 | 1959-11-17 | Method and apparatus for the manufacture of flexible sheets of heat cured foamed material |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB866299A (en) |
-
1959
- 1959-11-17 GB GB38892/59A patent/GB866299A/en not_active Expired
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