WO1999041055A1 - Process for the production of rubber products - Google Patents
Process for the production of rubber products Download PDFInfo
- Publication number
- WO1999041055A1 WO1999041055A1 PCT/GB1999/000489 GB9900489W WO9941055A1 WO 1999041055 A1 WO1999041055 A1 WO 1999041055A1 GB 9900489 W GB9900489 W GB 9900489W WO 9941055 A1 WO9941055 A1 WO 9941055A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- process according
- moulding material
- range
- moulding
- pressure
- Prior art date
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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; 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
- 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
- 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
- B29K2021/00—Use of unspecified rubbers as moulding 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
- B29K2105/251—Particles, powder or granules
-
- 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
- B29K2105/26—Scrap or recycled material
Definitions
- This invention relates to a process for the production of rubber products.
- a process for the production of a rubber product comprising forming a moulding material from a first ingredient comprising powdered rubber and a second ingredient comprising sulphur, and compressing the moulding material in a mould to form said rubber product.
- the moulding material may be compressed in said mould to a pressure of up to substantially 6.8 tons force per square inch.
- the moulding material is desirably compressed to a pressure in the range of substantially 32 pounds force per square inch (psi) to substantially 6.8 tons per square inch, preferably substantially 129psi to substantially 6.8 tons per square inch, more preferably substantially 129psi to substantially 1270psi, and in one embodiment is compressed to an initial pressure in the range of substantially 380psi to substantially 1270psi.
- the pressure of the moulding may increase during the moulding stage.
- the temperature of the moulding material may be elevated during compression. Desirably, the temperature of the moulding material is elevated to be above 100°C, desirably in the range of substantially 100°C to substantially 170°C during compression. Preferably the temperature is elevated to be in the range of substantially 120°C to substantially 170°C , more preferably substantially 140°C to substantially 170°C . The temperature of the moulding material may be elevated to be in the range of substantially 160°C to substantially 170°C during compression.
- the moulding material may be compressed for over 10 minutes to allow the moulding material to cure. Desirably, the moulding material is compressed for a period of time of between substantially 10 minutes to substantially 2 hours or substantially 3 hours.
- the moulding material is compressed for a period of time of between 10 minutes and substantially 60 minutes. More preferably the moulding material is compressed for a period of time of between substantially 20 minutes and substantially 60 minutes. In one embodiment, the moulding material may be compressed for a period of time of between substantially 40 minutes and substantially 60 minutes.
- the amount of sulphur in the moulding material may be in the range of substantially 0.5% w/w to substantially 25% w/w with respect to the weight of the first ingredient, preferably in the range of substantially 0.5% to substantially 10% w/w, more preferably in the range of substantially 0.5% w/w to substantially 5% w/w.
- the amount of sulphur in the moulding material is substantially 0.5% w/w, substantially 1% w/w, or substantially 5% w/w.
- the sulphur is in a powder form.
- sulphur powder may have a size of substantially 300 mesh or finer.
- the sulphur and rubber are preferably thoroughly mixed to form a substantially uniform mixture.
- the powdered rubber may have a particle size in the range of substantially 16 mesh to substantially 300 mesh, preferably in the range of substantially 16 mesh to substantially 50 mesh, more preferably substantially 40 mesh.
- the first ingredient may comprise up to 100% powdered rubber, or may include other matter, for example fibrous matter.
- the second ingredient may comprise powdered sulphur in a carrier, which may be a mineral oil.
- a carrier which may be a mineral oil.
- the second ingredient is a 300 mesh sulphur/mineral oil mix.
- An example of such a mix is manufactured by Hays Chemicals under the designation UNI350 5MI/226/S/97 GB/246S.
- the process may involve a pre-compacting step before applying said compression step above.
- the pre-compacting step may involve applying a pressure of the range of above substantially 64psi, desirably above substantially 129psi.
- the pre-compacting step is carried out at a pressure in the range of substantially 64psi to substantially 1935psi, more preferably in the range of substantially 129psi to substantially 1905psi.
- the pre-compacting step is carried out at a pressure of substantially 1905psi or substantially 1935psi.
- a first ingredient comprising a 40 mesh powdered rubber formed, for example, as a waste product (known as rubber dust) from the production of tyre remoulds is graded and mixed with a second ingredient or mixture, comprising a 300 mesh sulphur/mineral oil mix to form a moulding material.
- the amount of the second ingredient in the moulding material is selected to provide an amount of sulphur of 1% w/w with respect to the weight of the first ingredient.
- the moulding material is then thoroughly mixed, by any means known in the art, and then added to a mould.
- the material is compressed in the mould up to a pressure of substantially 400 psi, and heated to a temperature in the range of 130°C to 160°C.
- the pressure and heat are applied to the moulding material for a period of about 40 minutes, during which time, the moulding material cures to form a cohesive solid moulding.
- the first ingredient may comprise a mix of powdered rubber and a powdered fibrous material.
- the mixing equipment used to prepare each mixture comprised an electric Hobart food type mixer fitted with an open whisk and 5 litre mixing basin.
- Each mix was prepared by weighing out 500g of rubber dust and then adding the appropriate amount of sulphur to it.
- the sulphur was sieved prior to its addition, using a 300 mesh sieve, in order to remove any lumps.
- the mixture was then loaded in to the mixing chamber, the whisk raised and the mixer set to a speed of 270 rpm, and allowed to mix for a period of 20 minutes.
- the mixed batch was regarded to be satisfactory if it had uniform colour and was free from undispersed lumps.
- the mixed material was then placed into a clean polythene bag and labelled prior to moulding.
- the tooling used for moulding of plaques is a mould 10 which comprises a bottom plate 12 with a cavity 14.
- the cavity has a size of 119.4 mm diameter x 30.5 mm depth.
- the mould 10 also includes a top plate in the form of a piston 16.
- the piston has a diameter of 119 mm and depth of 18.3 mm, which gave a final cavity size of 119.4 mm diameter x 12.2 mm height.
- mouldings were then carried out using this quantity of mixture, at pre-compaction pressures ranging from 1905 lb/sq in. down to 64 lb/sq in. and moulding conditions set at 40 minutes at 160°C, with final moulding pressure set at 129 lb/sq in. in each case.
- the mouldings were checked for hardness and sectioned to check the level of compaction.
- the mould 10 is preheated up to the required moulding temperature in an electrically heated hydraulic press (not shown).
- the mould 10 is then taken from the press and the piston 16 removed.
- the cavity 14 is then completely filled with the moulding material or mixture 18, the piston 16 repositioned, and pressed down by hand.
- the piston 16 is removed and refilled with mixture and the piston 16 replaced. Then the mould 10 is placed in the press and the platens closed just enough to compact the mixture 18 further into the cavity 14.
- the mould 10 is again removed from the press, the piston 16 removed and the remainder of the mixture 18 placed into the cavity 14.
- the mould 10 is reassembled, placed back into the press and subjected to an initial moulding pressure of approximately 1935 lb/sq in. to compact the mixture 18.
- the pressure is then immediately reduced to the requisite moulding pressure for the stated cure time.
- the arrow P represents the application of pressure to the mixture 18 via the piston 16.
- the mould 10 On completion of the cure cycle, the mould 10 is removed from the press and the piston 16 removed.
- the moulded product or plaque is removed from the cavity 14 and allowed to cool to room temperature.
- the moulding pressure used to form the moulded plaques was calculated from the following formula.:
- TFO represents the compacted rubber dust containing no additional sulphur. ** Due to expansion on curing, a range of moulding pressure is quoted. *** Slit to examine consistency.
- Moulding trails were then carried out to cover a range of "low”, medium” and “high” pressures, at a variety of moulding times and temperatures.
- the moulding pressure was set at 1291b/sq in. (Low pressure) and mouldings were carried out at the cure times and cure 10
- the hardness of each material was determined in general accordance with BS903 Part A26 Normal Hardness Method: 1995. Each material was placed into a Wallace Normal hardness apparatus calibrated to the requirements of the specification, five hardness readings were taken on the moulded surface, and the median calculated.
- ATF1 Mixture containing 0.5% added sulphur
- ATF2 Mixture containing 1.0% added sulphur
- ATF3 Mixture containing 5.0% added sulphur
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU44810/99A AU4481099A (en) | 1998-02-17 | 1999-02-15 | Process for the production of rubber products |
EP99932483A EP1034069A1 (en) | 1998-02-17 | 1999-02-15 | Process for the production of rubber products |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9803353.3A GB9803353D0 (en) | 1998-02-17 | 1998-02-17 | Process for the production of rubber products |
GB9803353.3 | 1998-02-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999041055A1 true WO1999041055A1 (en) | 1999-08-19 |
Family
ID=10827141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1999/000489 WO1999041055A1 (en) | 1998-02-17 | 1999-02-15 | Process for the production of rubber products |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1034069A1 (en) |
AU (1) | AU4481099A (en) |
GB (1) | GB9803353D0 (en) |
WO (1) | WO1999041055A1 (en) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR628368A (en) * | 1926-02-02 | 1927-10-22 | Rissik Fraser & Company Ltd | Improvements in the manufacture of ebonite objects |
FR668737A (en) * | 1928-05-11 | 1929-11-06 | H F De Poix Et Cie | Preparation process for molded rubber parts |
US3297662A (en) * | 1965-08-16 | 1967-01-10 | Walter O Farrell | Method of preparing hard rubber crumb |
FR2198831A1 (en) * | 1972-09-07 | 1974-04-05 | Lab Himmelheber Gmbh Co | Moulding material formed by grinding used vehicle tyres - to fine powder in which the rubber and textile particles are indistinguishable to the eye |
US4244841A (en) * | 1980-03-24 | 1981-01-13 | Frankland Enterprises, Inc. | Method for recycling rubber and recycled rubber product |
JPS6067117A (en) * | 1983-09-24 | 1985-04-17 | Matsushita Electric Works Ltd | Manufacture of reclaimed rubber plate |
JPH04110326A (en) * | 1990-08-31 | 1992-04-10 | Kinugawa Rubber Ind Co Ltd | Vulcanized rubber chip molding |
JPH06256002A (en) * | 1993-02-26 | 1994-09-13 | Sanshin Chem Ind Co Ltd | Production of granulated material of insoluble sulfur |
JPH0780866A (en) * | 1993-09-14 | 1995-03-28 | Kunio Hasegawa | Method for producing new stock from worn tire |
-
1998
- 1998-02-17 GB GBGB9803353.3A patent/GB9803353D0/en not_active Ceased
-
1999
- 1999-02-15 WO PCT/GB1999/000489 patent/WO1999041055A1/en not_active Application Discontinuation
- 1999-02-15 AU AU44810/99A patent/AU4481099A/en not_active Abandoned
- 1999-02-15 EP EP99932483A patent/EP1034069A1/en not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR628368A (en) * | 1926-02-02 | 1927-10-22 | Rissik Fraser & Company Ltd | Improvements in the manufacture of ebonite objects |
FR668737A (en) * | 1928-05-11 | 1929-11-06 | H F De Poix Et Cie | Preparation process for molded rubber parts |
US3297662A (en) * | 1965-08-16 | 1967-01-10 | Walter O Farrell | Method of preparing hard rubber crumb |
FR2198831A1 (en) * | 1972-09-07 | 1974-04-05 | Lab Himmelheber Gmbh Co | Moulding material formed by grinding used vehicle tyres - to fine powder in which the rubber and textile particles are indistinguishable to the eye |
US4244841A (en) * | 1980-03-24 | 1981-01-13 | Frankland Enterprises, Inc. | Method for recycling rubber and recycled rubber product |
JPS6067117A (en) * | 1983-09-24 | 1985-04-17 | Matsushita Electric Works Ltd | Manufacture of reclaimed rubber plate |
JPH04110326A (en) * | 1990-08-31 | 1992-04-10 | Kinugawa Rubber Ind Co Ltd | Vulcanized rubber chip molding |
JPH06256002A (en) * | 1993-02-26 | 1994-09-13 | Sanshin Chem Ind Co Ltd | Production of granulated material of insoluble sulfur |
JPH0780866A (en) * | 1993-09-14 | 1995-03-28 | Kunio Hasegawa | Method for producing new stock from worn tire |
Non-Patent Citations (4)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 009, no. 206 (M - 406) 23 August 1985 (1985-08-23) * |
PATENT ABSTRACTS OF JAPAN vol. 016, no. 358 (C - 0970) 4 August 1992 (1992-08-04) * |
PATENT ABSTRACTS OF JAPAN vol. 018, no. 651 (C - 1285) 9 December 1994 (1994-12-09) * |
PATENT ABSTRACTS OF JAPAN vol. 095, no. 006 31 July 1995 (1995-07-31) * |
Also Published As
Publication number | Publication date |
---|---|
AU4481099A (en) | 1999-08-30 |
EP1034069A1 (en) | 2000-09-13 |
GB9803353D0 (en) | 1998-04-15 |
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