GB572425A - Improvements in or relating to the moulding of thermo-setting plastics - Google Patents
Improvements in or relating to the moulding of thermo-setting plasticsInfo
- Publication number
- GB572425A GB572425A GB16680/43A GB1668043A GB572425A GB 572425 A GB572425 A GB 572425A GB 16680/43 A GB16680/43 A GB 16680/43A GB 1668043 A GB1668043 A GB 1668043A GB 572425 A GB572425 A GB 572425A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- frequency
- condenser
- heated
- heating
- 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
- 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
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/52—Heating or cooling
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/46—Dielectric heating
- H05B6/48—Circuits
- H05B6/50—Circuits for monitoring or control
-
- 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
- B29C2791/00—Shaping characteristics in general
- B29C2791/001—Shaping in several steps
-
- 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
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
-
- 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
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
- B29K2101/10—Thermosetting resins
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
572,425. Dielectric heating thermosetting plastic. BAKELITE, Ltd. Oct. 12, 1943, No. 16680. Convention date, Dec. 11, 1942. [Class 39 (iii)] [Also in Groups V and XXXV] A method of moulding a thermo, setting plastic comprises the steps of (a) inducing heat within the plastic mass by subjecting it to the action of a high frequency electrostatic field, energy being supplied to the field at such a rate that a hardening temperature is reached within the mass before a degree of hardening interfering with plastic flow is obtained, (b) shaping the mass in a mould by pressure and (c) heathardening the. shaped mass. Preforms or sheets which are to be pressure-moulded may be heated between plates operating as a condenser and then quickly transferred to a hot mould which may be heated either by H.F. electrostatic field or in the usual manner, A number of preforms may be heated simultaneously by the field, e.g., by being carried between condenser plates by a movable belt, and enclosures may be provided for supplementary conduction or radiation-heating. Alternatively and as shown in Fig. 2, a condenser unit may be built into the mould and moulding powder or a preform, pre-heated by H.F. electrostatic field, is placed in the mould and simultaneously heated and pressed therein. The mould shown comprises top and bottom forces 42, 43 keyed at 47 to a top plate 46, and a chase 41 keyed at 45 to a bottom plate 44. These parts are made of insulating material such as mica-filled ceramic material. The forces are lined with non-ferrous metal (brass,. copper, bronze) sheets 53, 54 to form electrodes. Leads 48, 49 from a highfrequency generator terminate in contacts 50, 51. The mould may be placed between the platens of a press; the plates 44, 46 may be fixed to the lower and upper platens. Fig. 1 shows a circuit for generating high-frequency oscillations, in which plate electrodes 1 are fed from a 220-volt A.C. supply through an auto-transformer 15, power-transformer 17, two half-wave mercury arc rectifier tubes 18, 19, audio-frequency filter choke 33, radio-frequency choke 36, tank coil 6, radio-frequency coil 5 and tuning condensers 2, 3, 4. The operating frequency is determined largely by the sizes of the coil 6 and its associated plate condenser 7, which are connected to the plates of oscillator tubes 8, 9 operating in push-pull. The plate current can be varied over a large range by a small adjustment of the condenser 4. The Specification as open to inspection under Sect. 91 states that the heating of the material may be carried out partly by high-frequency and partly by heating in an oven, to a point below that at which hardening is initiated, heating being continued by means of a H.F. electrostatic field. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US572425XA | 1942-12-11 | 1942-12-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB572425A true GB572425A (en) | 1945-10-08 |
Family
ID=22009388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB16680/43A Expired GB572425A (en) | 1942-12-11 | 1943-10-12 | Improvements in or relating to the moulding of thermo-setting plastics |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB572425A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4699578A (en) * | 1984-11-28 | 1987-10-13 | Apsley Metals Limited | Tire mold and apparatus for vulcanizing a tire by means of electromagnetically induced heat |
US5139407A (en) * | 1989-09-01 | 1992-08-18 | General Electric Company | Apparatus for reducing thermoplastic material compression mold cycle time |
US5176839A (en) * | 1991-03-28 | 1993-01-05 | General Electric Company | Multilayered mold structure for hot surface molding in a short cycle time |
EP3206851B1 (en) * | 2014-10-13 | 2022-03-23 | Steffen Autenrieth | Temperature-control device |
-
1943
- 1943-10-12 GB GB16680/43A patent/GB572425A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4699578A (en) * | 1984-11-28 | 1987-10-13 | Apsley Metals Limited | Tire mold and apparatus for vulcanizing a tire by means of electromagnetically induced heat |
US5139407A (en) * | 1989-09-01 | 1992-08-18 | General Electric Company | Apparatus for reducing thermoplastic material compression mold cycle time |
US5176839A (en) * | 1991-03-28 | 1993-01-05 | General Electric Company | Multilayered mold structure for hot surface molding in a short cycle time |
EP3206851B1 (en) * | 2014-10-13 | 2022-03-23 | Steffen Autenrieth | Temperature-control device |
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