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GB2196637A - Microwave treatment of rubber scrap - Google Patents

Microwave treatment of rubber scrap Download PDF

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Publication number
GB2196637A
GB2196637A GB8624362A GB8624362A GB2196637A GB 2196637 A GB2196637 A GB 2196637A GB 8624362 A GB8624362 A GB 8624362A GB 8624362 A GB8624362 A GB 8624362A GB 2196637 A GB2196637 A GB 2196637A
Authority
GB
United Kingdom
Prior art keywords
article
rubber
irradiation
oven
product
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.)
Withdrawn
Application number
GB8624362A
Other versions
GB8624362D0 (en
Inventor
Kenneth Michael Holland
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB8624362A priority Critical patent/GB2196637A/en
Publication of GB8624362D0 publication Critical patent/GB8624362D0/en
Publication of GB2196637A publication Critical patent/GB2196637A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2030/00—Pneumatic or solid tyres or parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processing Of Solid Wastes (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

Waste products are subjected to microwave or like irradiation so as to break down the molecular structure thereof and then subjected to compressive force to break down the structural integrity of the article. Typically, rubber tyres are treated in a microwave oven, evolved gases being removed, and transferred to an hydraulic press.

Description

SPECIFICATION Disposition of rubber tyres This invention relates to a method of, and apparatus for, disposing of waste products, particularly waste products make principally of rubber. The invention is concerned primarily with the disposition of rubber tyres.
The disposal of used rubber tyres is a major problem in all industrialised countries. One of the main methods of disposition is landfill in either mines, quarries or large holes dug specially in the ground. Another method is to shred or strip the tyres and then to burn them. Both these methods are extremely costly, and both are open to objection on environmental grounds.
The present invention provides a method of disposing of a waste product made principally of rubber, the method comprising the steps of subjecting the product to microwave radiation of a predetermined wavelength at a predetermined power for a predetermined time, and then subjecting the irradiated product to a predetermined compressive force.
Preferably, the irradiation step is carried out inside a closed space having a limited air supply.
During the irradiation step, gases are given off from the product at a rapid rate. Advantageously, therefore, the method further comprises the steps of removing the gases, and of cleaning/scrubbing the gases.
The invention also provides apparatus for disposing a waste product article made principally of rubber, the apparatus comprising a microwave oven large enough to contain the article and having a power output sufficient to modify the structure of the article, and means for applying a compressive force to the article after irradiation in the oven.
Advantageously, the oven is provided with means for extracting gases given off during irradiation of the article. Preferably, the apparatus further comprises means for cleaning and/or scrubbing the extracted gases.
In a preferred embodiment, a hydraulic press constitutes the means for applying a compressive force.
The following example illustrates the invention. A section of a used motor vehicle tyre was placed in an industrial microwave oven having a power rating of 1 kilowatt. The oven was turned on, and the tyre section irradiated for 5 minutes. During this time, a copious amount of grey gas produced by the heating action of the microwaves on the tyre section.
This gas was removed from the oven by an extractor fan, and passed to a cleaning/ scrubbing apparatus. Following irradiation, the tyre section was removed from the oven, and compressed using a small hydraulic press. The compression step reduced the irradiated tyre section to a fine black powder having the particle size of talcum powder. The metal strips contained in the tyre section were recovered intact.
It is envisaged that there will be no difficulty in scaling up the process (by using a speciallyconstructed large industrial microwave oven and a large hydraulic press) so that entire tyres can be treated in bulk. Obviously, the power of the microwave oven used, the wavelength of the microwaves, and the duration of the irradiation step will depend upon the mass of rubber tyres to be treated.
The advantages of the method are that rubber tyres can easily and safely be disposed of without substantial risk of environmental damage, and that all the products of the disposed process are of commercial value. In this connection, it is thought that the cleaned and scrubbed gases will be commercially valuable, that the metal strips will be capable of being recycled, and that the black powder residue will find many commercial uses, for example in making asphalt for roads, as a building material for adding to a cement/sand/water mixture, and in the chemical industry.
Although the invention is primarily concerned with the disposal of rubber tyres, it is believed that this method could be used to dispose of other degradable waste products.
It is also believed that other forms of high frequency heating (such as radio frequency heating) can be used instead of microwave heating.
1. A method of disposal of a waste product principally comprising rubber, which comprises the steps of subjecting said waste product to microwave irradiation so as to cause degradation of said product, and subjecting the irradiated product to a predetermined compressive force do as to break down the structural integrity of said product.
2. A method according to claim 1, in which the irradiation is carried out inside a close space having a limited air supply.
3. A method according to claim 1 or 2, which further comprises the steps of removing and either cleaning or scrubbing gases evolved by said microwave irradiation.
4. A method according to any of claims 1 to 3, in which the compressive force is applied by means of a hydraulic press.
5. A method according to any of claims 1 to 4, in which said waste product comprises waste rubber tyres.
6. A method according to any of claims 1 to 5, in which said tyres are substantially whole.
7. Apparatus for disposal of a bulk waste product article principally made of rubber, which comprises a microwave oven which is large enough to contain said article and which has a power output sufficient to irradiate said article to induce degradation thereof; and
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (11)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Disposition of rubber tyres This invention relates to a method of, and apparatus for, disposing of waste products, particularly waste products make principally of rubber. The invention is concerned primarily with the disposition of rubber tyres. The disposal of used rubber tyres is a major problem in all industrialised countries. One of the main methods of disposition is landfill in either mines, quarries or large holes dug specially in the ground. Another method is to shred or strip the tyres and then to burn them. Both these methods are extremely costly, and both are open to objection on environmental grounds. The present invention provides a method of disposing of a waste product made principally of rubber, the method comprising the steps of subjecting the product to microwave radiation of a predetermined wavelength at a predetermined power for a predetermined time, and then subjecting the irradiated product to a predetermined compressive force. Preferably, the irradiation step is carried out inside a closed space having a limited air supply. During the irradiation step, gases are given off from the product at a rapid rate. Advantageously, therefore, the method further comprises the steps of removing the gases, and of cleaning/scrubbing the gases. The invention also provides apparatus for disposing a waste product article made principally of rubber, the apparatus comprising a microwave oven large enough to contain the article and having a power output sufficient to modify the structure of the article, and means for applying a compressive force to the article after irradiation in the oven. Advantageously, the oven is provided with means for extracting gases given off during irradiation of the article. Preferably, the apparatus further comprises means for cleaning and/or scrubbing the extracted gases. In a preferred embodiment, a hydraulic press constitutes the means for applying a compressive force. The following example illustrates the invention. A section of a used motor vehicle tyre was placed in an industrial microwave oven having a power rating of 1 kilowatt. The oven was turned on, and the tyre section irradiated for 5 minutes. During this time, a copious amount of grey gas produced by the heating action of the microwaves on the tyre section. This gas was removed from the oven by an extractor fan, and passed to a cleaning/ scrubbing apparatus. Following irradiation, the tyre section was removed from the oven, and compressed using a small hydraulic press. The compression step reduced the irradiated tyre section to a fine black powder having the particle size of talcum powder. The metal strips contained in the tyre section were recovered intact. It is envisaged that there will be no difficulty in scaling up the process (by using a speciallyconstructed large industrial microwave oven and a large hydraulic press) so that entire tyres can be treated in bulk. Obviously, the power of the microwave oven used, the wavelength of the microwaves, and the duration of the irradiation step will depend upon the mass of rubber tyres to be treated. The advantages of the method are that rubber tyres can easily and safely be disposed of without substantial risk of environmental damage, and that all the products of the disposed process are of commercial value. In this connection, it is thought that the cleaned and scrubbed gases will be commercially valuable, that the metal strips will be capable of being recycled, and that the black powder residue will find many commercial uses, for example in making asphalt for roads, as a building material for adding to a cement/sand/water mixture, and in the chemical industry. Although the invention is primarily concerned with the disposal of rubber tyres, it is believed that this method could be used to dispose of other degradable waste products. It is also believed that other forms of high frequency heating (such as radio frequency heating) can be used instead of microwave heating. CLAIMS
1. A method of disposal of a waste product principally comprising rubber, which comprises the steps of subjecting said waste product to microwave irradiation so as to cause degradation of said product, and subjecting the irradiated product to a predetermined compressive force do as to break down the structural integrity of said product.
2. A method according to claim 1, in which the irradiation is carried out inside a close space having a limited air supply.
3. A method according to claim 1 or 2, which further comprises the steps of removing and either cleaning or scrubbing gases evolved by said microwave irradiation.
4. A method according to any of claims 1 to 3, in which the compressive force is applied by means of a hydraulic press.
5. A method according to any of claims 1 to 4, in which said waste product comprises waste rubber tyres.
6. A method according to any of claims 1 to 5, in which said tyres are substantially whole.
7. Apparatus for disposal of a bulk waste product article principally made of rubber, which comprises a microwave oven which is large enough to contain said article and which has a power output sufficient to irradiate said article to induce degradation thereof; and means for applying a compressive force to the article after said article has been irradiated in the oven.
8. Apparatus according to claim 7, which is further provided with means for extracting gases evolved during irradiation of the article.
9. Apparatus according to claim 7, in which said apparatus further comprises means for cleaning and/or scrubbing extracted gases.
10. Apparatus according to any of claims 6 to 8, in which said means for applying a compressive force is a hydraulic press.
11. A method according to claim 1 substantially as described herein with reference to the foregoing example.
GB8624362A 1986-10-10 1986-10-10 Microwave treatment of rubber scrap Withdrawn GB2196637A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8624362A GB2196637A (en) 1986-10-10 1986-10-10 Microwave treatment of rubber scrap

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8624362A GB2196637A (en) 1986-10-10 1986-10-10 Microwave treatment of rubber scrap

Publications (2)

Publication Number Publication Date
GB8624362D0 GB8624362D0 (en) 1986-11-12
GB2196637A true GB2196637A (en) 1988-05-05

Family

ID=10605557

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8624362A Withdrawn GB2196637A (en) 1986-10-10 1986-10-10 Microwave treatment of rubber scrap

Country Status (1)

Country Link
GB (1) GB2196637A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997005995A1 (en) * 1995-08-08 1997-02-20 Finansovo Investitsionnaya Kor Method of shredding worn out tyre casings and a device for applying the method
WO1997044171A1 (en) * 1996-05-20 1997-11-27 Jury Stepanovich Podzirei Device for destroying tires with metallic cord

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1333450A (en) * 1970-11-06 1973-10-10 Raffinage Cie Francaise Device for welding together sheets or strips of a material capable of absorbing ultra high-frequency waves
GB1513695A (en) * 1975-08-15 1978-06-07 Air Prod & Chem Process for reclaiming rubber metal and fabric from tyre scrap
US4104205A (en) * 1976-01-06 1978-08-01 The Goodyear Tire & Rubber Company Microwave devulcanization of rubber
US4129768A (en) * 1977-01-07 1978-12-12 Gerling Moore, Inc. Method and apparatus for microwave heating of flowable material
GB2071970A (en) * 1980-03-12 1981-09-23 Doryokuro Kakunenryo Heat treating method and apparatus using microwaves
US4469817A (en) * 1981-11-19 1984-09-04 Toyoda Gosei Co., Ltd. Method for reclamation of vulcanized rubber

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1333450A (en) * 1970-11-06 1973-10-10 Raffinage Cie Francaise Device for welding together sheets or strips of a material capable of absorbing ultra high-frequency waves
GB1513695A (en) * 1975-08-15 1978-06-07 Air Prod & Chem Process for reclaiming rubber metal and fabric from tyre scrap
US4104205A (en) * 1976-01-06 1978-08-01 The Goodyear Tire & Rubber Company Microwave devulcanization of rubber
US4129768A (en) * 1977-01-07 1978-12-12 Gerling Moore, Inc. Method and apparatus for microwave heating of flowable material
GB2071970A (en) * 1980-03-12 1981-09-23 Doryokuro Kakunenryo Heat treating method and apparatus using microwaves
US4469817A (en) * 1981-11-19 1984-09-04 Toyoda Gosei Co., Ltd. Method for reclamation of vulcanized rubber

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997005995A1 (en) * 1995-08-08 1997-02-20 Finansovo Investitsionnaya Kor Method of shredding worn out tyre casings and a device for applying the method
US6056216A (en) * 1995-08-08 2000-05-02 Obschestvo S Ogranichennoi Otvetstvennostju "Explotekh" Method of shredding worn out tire casings and a device for applying the method
AU722283B2 (en) * 1995-08-08 2000-07-27 Alexandr Andreevich Nabok Method and device for shredding wornout tire cases
WO1997044171A1 (en) * 1996-05-20 1997-11-27 Jury Stepanovich Podzirei Device for destroying tires with metallic cord

Also Published As

Publication number Publication date
GB8624362D0 (en) 1986-11-12

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)