CA2079209A1 - Process for preparing rubber-containing waste for further treatment - Google Patents
Process for preparing rubber-containing waste for further treatmentInfo
- Publication number
- CA2079209A1 CA2079209A1 CA 2079209 CA2079209A CA2079209A1 CA 2079209 A1 CA2079209 A1 CA 2079209A1 CA 2079209 CA2079209 CA 2079209 CA 2079209 A CA2079209 A CA 2079209A CA 2079209 A1 CA2079209 A1 CA 2079209A1
- Authority
- CA
- Canada
- Prior art keywords
- screw press
- wastes
- rubber
- cooling
- waste
- 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.)
- Abandoned
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
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B17/0404—Disintegrating plastics, e.g. by milling to powder
- B29B17/0408—Disintegrating plastics, e.g. by milling to powder using cryogenic systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
- B02C19/186—Use of cold or heat for disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/22—Crushing mills with screw-shaped crushing means
-
- 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
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
- F25D3/11—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air with conveyors carrying articles to be cooled through the cooling space
-
- 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
- B29B2017/0424—Specific disintegrating techniques; devices therefor
- B29B2017/046—Extruder as pressing tool with calibrated die openings for forming and disintegrating pasty or melted material
-
- 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)
- Food Science & Technology (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
(57) Abstract The description relates to a process for preparing rubber-containing waste for further treatment by making use of the brit-leness of individual components of the waste by cooling the waste, in which the rubber-containing wastes is milled in a worm-drive press, cooled at least in the press and possibly more finely divided before insertion in the press. Liquid nitrogen or water is added for cooling purposes. This process uses less power and less coolant like nitrogen or the like is needed.
Description
~079209 PROCESS FOR PREPARING RUBBER-CONTAINING WASTE
FOR FURTHER TREATMENT
Description The invention concerns a process for preparing rubber-containing waste for further treatment.
Rubber-containing wastes, such as old rubber, automobile tires, rein-forced rubber seals, for instance for windows and doors, in particular for automobiles, :~ hoses, such as oil-hoses or the like, at present are generally more or less pre-com-minuted for subsequent further processing and further use. Thereafter the wastes are further processed in part, the attempt being made to separate the individual com-. ponents of these waste materials. For example, metals such as iron, steel or iron wires, plastics, fibers, formed fabrics or the like may be present in addition to the rubber components.
It is already known to grind or smash rubber-containing wastes in mills, these wastes having been previously or simultaneously cooled or deep-cooled in order to exploit the brittleness of the cold rubber and especially to avoid rubber vulcanization or melting of any plastic. Cooling the wastes also increases the brit-tleness especially of the rubber, and accordingly, it can be separated more easily from any metallic components. In particular, the metallic components are released andseparated from the rubber and other components. Depending on the required temperature, cooling is carried out by adding cold water or liquid nitrogen or the like.
Thereupon the mixture of individual components which are discharged from the mill can be separated. For example, iron parts may be pulled out using a - , . .,, :
.
.
.,, ~.
.. . .
20792~9 magnet. Fibers or the like may be sucked out where called for. The mixture of individual components also may be separated by sifting.
However, the mills take up much space at the work site and conse-quently large quantities of coolants such as liquid nitrogen must be added.
Accordingly, it is the object of the present invention to employ a process for preparing rubber-containing waste for further treatment, said process being more energy-conseIving and requiring less coolant such as nitrogen or the like.
This problem is solved by the process defined in claim 1. In this process preparing rubber-containing wastes for further treatment, the rubber-con-taining wastes are milled in a screw press, are compressed at a pressure up to 100 bars, and the wastes are cooled at least in said press.
The process of the invention lowers the consumption of liquid nitrogen -.~
~, or other coolants to well below 50 % of the quantities required in the procedures known heretofore, such as grinding in mills or the like, because the free volume between the waste particles in the screw press is much reduced and is decreased even to a few percent by volume. In particular, the metal components are released from the other components in the screw press. Moreover, the rubber is gro~md and pressed so hard that the plastic and/or fiber components separate from it.
In a first embodiment of the process of the invention, liquid nitrogen is added to the waste for purposes of cooling. The boiling point of nitrogen is -195.8C. When using liquid nitrogen, the waste material can be cooled down to about -120C. It is discharged from the screw press at a temperature of about 50C.
SUBSTITUTE SHEET
, .
:, , :: . ~ : :. ., .. ,, .: : :-: . :
FOR FURTHER TREATMENT
Description The invention concerns a process for preparing rubber-containing waste for further treatment.
Rubber-containing wastes, such as old rubber, automobile tires, rein-forced rubber seals, for instance for windows and doors, in particular for automobiles, :~ hoses, such as oil-hoses or the like, at present are generally more or less pre-com-minuted for subsequent further processing and further use. Thereafter the wastes are further processed in part, the attempt being made to separate the individual com-. ponents of these waste materials. For example, metals such as iron, steel or iron wires, plastics, fibers, formed fabrics or the like may be present in addition to the rubber components.
It is already known to grind or smash rubber-containing wastes in mills, these wastes having been previously or simultaneously cooled or deep-cooled in order to exploit the brittleness of the cold rubber and especially to avoid rubber vulcanization or melting of any plastic. Cooling the wastes also increases the brit-tleness especially of the rubber, and accordingly, it can be separated more easily from any metallic components. In particular, the metallic components are released andseparated from the rubber and other components. Depending on the required temperature, cooling is carried out by adding cold water or liquid nitrogen or the like.
Thereupon the mixture of individual components which are discharged from the mill can be separated. For example, iron parts may be pulled out using a - , . .,, :
.
.
.,, ~.
.. . .
20792~9 magnet. Fibers or the like may be sucked out where called for. The mixture of individual components also may be separated by sifting.
However, the mills take up much space at the work site and conse-quently large quantities of coolants such as liquid nitrogen must be added.
Accordingly, it is the object of the present invention to employ a process for preparing rubber-containing waste for further treatment, said process being more energy-conseIving and requiring less coolant such as nitrogen or the like.
This problem is solved by the process defined in claim 1. In this process preparing rubber-containing wastes for further treatment, the rubber-con-taining wastes are milled in a screw press, are compressed at a pressure up to 100 bars, and the wastes are cooled at least in said press.
The process of the invention lowers the consumption of liquid nitrogen -.~
~, or other coolants to well below 50 % of the quantities required in the procedures known heretofore, such as grinding in mills or the like, because the free volume between the waste particles in the screw press is much reduced and is decreased even to a few percent by volume. In particular, the metal components are released from the other components in the screw press. Moreover, the rubber is gro~md and pressed so hard that the plastic and/or fiber components separate from it.
In a first embodiment of the process of the invention, liquid nitrogen is added to the waste for purposes of cooling. The boiling point of nitrogen is -195.8C. When using liquid nitrogen, the waste material can be cooled down to about -120C. It is discharged from the screw press at a temperature of about 50C.
SUBSTITUTE SHEET
, .
:, , :: . ~ : :. ., .. ,, .: : :-: . :
2~792~
3 ;
In another embodiment of the process of the invention, relating to higher acceptable temperatures, for instance when preparing old tires containing rubber which is already more brittle, cold water can be added for cooling.
The coolant can be admixed with the wastes before same are fed into the screw press, as a result of which thorough mixing of waste particles and coolant leads to optimal cooling of the waste particles.
The special cooling furthermore precludes vulcanization or post-vul-' canization when grinding the wastes in a screw press.
,. .
Part of the coolant, such as liquid nitrogen or water, evaporates in the screw press during grinding. Following discharge from the screw press, the residual liquid is separated from the solid parts.
Preferably, the solid wastes are pre-comminuted before being fed to the screw press, the rubber-containing wastes being fed to the screw press in, for example, granulated form. Thereby the wastes are more easily fed into the screw press, and moreover, the smaller particles can be cooled more rapidly and easily. In addition, the components issuing from the screw press are more easily separated. The granulate from the rubber-containing wastes, such as old tires, may evince diameters of 10 to 40 mm. As a result, the metallic components are present in smaller sizes, allowing easier separation from the other components by magnetism or sifting.
The pressure exerted on the wastes in the screw press may be up to 100 bars.
SUBSTITUTE SHEET
.. . . : . : - - . :, .. .: '.. ~: - : . -20~92~9 In a preferred embodiment of the process, the air present between the granulates, which is generally warm environmental air, is removed from the wastes that will be fed to the screw press. If air were present in the screw press, the temperature would rise in it excessively, and hence more coolant would have to be 5 admixed.
Because of higher heat in the screw press, liquids such as water or liquid nitrogen will evaporate. Advantageously, this evaporated liquid shall be collected and cooled again.
~,' Preferably, the constituent parts of the screw press, for instance the ' 10case, the screw or the like, shall be cooled by liquid nitrogen, cold water or the like passing through cooling ducts, so that both cooling is improved and the coolant can be used again without purification being required.
The mixture of the individual waste components discharged from the screw press is thereafter subjected to separation such as sifting, magnetic removal of 15 metallic parts or the like.
The design of the screw press may be such as ls disclosed for instance in WO A 83/03,999, German patent documents A 3,714,508; A 3,714,509 and A
3,714,518. This is a screw press with two mutually parallel screws. However, other scre~ presses also may be used.
. ~ ~ . ................... : . ,. , ........... -. .,. ~ ~ . .. .
.. , - ~ . :
In another embodiment of the process of the invention, relating to higher acceptable temperatures, for instance when preparing old tires containing rubber which is already more brittle, cold water can be added for cooling.
The coolant can be admixed with the wastes before same are fed into the screw press, as a result of which thorough mixing of waste particles and coolant leads to optimal cooling of the waste particles.
The special cooling furthermore precludes vulcanization or post-vul-' canization when grinding the wastes in a screw press.
,. .
Part of the coolant, such as liquid nitrogen or water, evaporates in the screw press during grinding. Following discharge from the screw press, the residual liquid is separated from the solid parts.
Preferably, the solid wastes are pre-comminuted before being fed to the screw press, the rubber-containing wastes being fed to the screw press in, for example, granulated form. Thereby the wastes are more easily fed into the screw press, and moreover, the smaller particles can be cooled more rapidly and easily. In addition, the components issuing from the screw press are more easily separated. The granulate from the rubber-containing wastes, such as old tires, may evince diameters of 10 to 40 mm. As a result, the metallic components are present in smaller sizes, allowing easier separation from the other components by magnetism or sifting.
The pressure exerted on the wastes in the screw press may be up to 100 bars.
SUBSTITUTE SHEET
.. . . : . : - - . :, .. .: '.. ~: - : . -20~92~9 In a preferred embodiment of the process, the air present between the granulates, which is generally warm environmental air, is removed from the wastes that will be fed to the screw press. If air were present in the screw press, the temperature would rise in it excessively, and hence more coolant would have to be 5 admixed.
Because of higher heat in the screw press, liquids such as water or liquid nitrogen will evaporate. Advantageously, this evaporated liquid shall be collected and cooled again.
~,' Preferably, the constituent parts of the screw press, for instance the ' 10case, the screw or the like, shall be cooled by liquid nitrogen, cold water or the like passing through cooling ducts, so that both cooling is improved and the coolant can be used again without purification being required.
The mixture of the individual waste components discharged from the screw press is thereafter subjected to separation such as sifting, magnetic removal of 15 metallic parts or the like.
The design of the screw press may be such as ls disclosed for instance in WO A 83/03,999, German patent documents A 3,714,508; A 3,714,509 and A
3,714,518. This is a screw press with two mutually parallel screws. However, other scre~ presses also may be used.
. ~ ~ . ................... : . ,. , ........... -. .,. ~ ~ . .. .
.. , - ~ . :
Claims (7)
1. A process for preparing rubber-containing wastes for further treatment by exploiting the brittleness of individual waste-components by cooling the wastes to be prepared, characterized in that the rubber-containing wastes are milled in a screw press, are compressed at a pressure of up to 100 bars, are cooled at least in the screw press and, optionally are pre-com-minuted before being fed to the screw press.
2. Process defined in claim 1, characterized in that liquid nitrogen is admixed to the wastes for cooling.
3. Process defined in claim 1, characterized in that water is admixed to the wastes for cooling.
4. Process defined in one of the above claims, characterized in that the rubber-containing wastes are introduced as granules into the screw press.
5. Process defined in one of the above claims, characterized in that the air present between the granulates of the wastes to be fed into the screw press is removed.
6. Process defined in one of the above claims, characterized in that the constituent parts of the screw press, for instance the case, the screw or the like are cooled by liquid nitrogen, cold water or the like.
7. Process defined in one of the above claims, characterized in that the mixture of individual waste-components discharging from the screw press is subjected to separation such as sifting, magnetic removal of metallic parts or the like.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4009902.4 | 1990-03-28 | ||
| DE19904009902 DE4009902A1 (en) | 1990-03-28 | 1990-03-28 | METHOD FOR PROCESSING RUBBER-BASED WASTE FOR PROCESSING |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2079209A1 true CA2079209A1 (en) | 1991-09-29 |
Family
ID=6403210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2079209 Abandoned CA2079209A1 (en) | 1990-03-28 | 1991-03-26 | Process for preparing rubber-containing waste for further treatment |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0528808A1 (en) |
| JP (1) | JPH05505773A (en) |
| CA (1) | CA2079209A1 (en) |
| DE (1) | DE4009902A1 (en) |
| WO (1) | WO1991014552A1 (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5395055A (en) * | 1992-11-03 | 1995-03-07 | Illinois Institute Of Technology | Solid state shear extrusion pulverization |
| US5397065A (en) * | 1992-11-03 | 1995-03-14 | Illinois Institute Of Technology | Solid state shear extrusion pulverization |
| ATE156410T1 (en) * | 1992-11-03 | 1997-08-15 | Illinois Technology Inst | EXTRUSION OF SOLID STATE POLYMERS TO PRODUCE POWDER |
| US5415354A (en) * | 1992-11-03 | 1995-05-16 | Illinois Institute Of Technology | Solid state shear extrusion pulverization |
| US5743471A (en) * | 1993-08-02 | 1998-04-28 | Illinois Institute Of Technology | Solid state shear extrusion pulverization |
| US5704555A (en) * | 1993-08-02 | 1998-01-06 | Illinois Institute Of Technology | Single-screw extruder for solid state shear extrusion pulverization and method |
| US5883140A (en) * | 1993-12-06 | 1999-03-16 | National Rubber L.L.C. | Process for regeneration of rubber |
| DE19611951A1 (en) * | 1996-03-26 | 1997-10-02 | Werner Trapp | Reducing plastics and rubber waste |
| US5992335A (en) | 1996-09-13 | 1999-11-30 | Nkk Corporation | Method of blowing synthetic resin into furnace and apparatus therefor |
| DE10050295A1 (en) * | 2000-10-10 | 2002-04-11 | Buehler Ag | Multi-shaft extruder for processing rubber compounds with fillers and additives has a specified gap between the shaft kneading blocks and barrel wall |
| WO2004050320A1 (en) | 2002-12-02 | 2004-06-17 | Pirelli & C. S.P.A. | Extrusion pulverization process of a vulcanized rubber material |
| DE10357968B4 (en) * | 2003-07-02 | 2008-04-03 | Bernd Zenker | Recycling plant and method for cold comminution of rubber products, steel-rubber composites and steel cord |
| DE102006028563A1 (en) * | 2006-06-22 | 2007-12-27 | Phoenix Conveyor Belt Systems Gmbh | Recycling of rubber and metal from steel-reinforced rubber wastes, pre-comminutes coarsely, embrittles rubber in cold chamber and breaks rubber away using deflection rollers |
| DE102021112308A1 (en) | 2021-05-11 | 2022-11-17 | Harburg-Freudenberger Maschinenbau Gmbh | Method and device for pressing |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2412586A (en) * | 1943-08-20 | 1946-12-17 | Boston Woven Hose & Rubber Com | Grinding of rubber scrap |
| CA954103A (en) * | 1970-09-14 | 1974-09-03 | Rudolph H. Kohler | Process for cryogenically reclaiming scrap rubber |
| US4041115A (en) * | 1975-05-12 | 1977-08-09 | E. I. Du Pont De Nemours And Company | Continuous process for preparing particulate microporous, open-celled polymer structures in a screw-type extruder |
| DE3714509A1 (en) * | 1987-04-30 | 1988-11-10 | Wilfried Schraufstetter | Screw press having two screws, in particular for disintegrating materials |
| DE8901206U1 (en) * | 1989-02-03 | 1989-03-23 | IGS Dosiertechnik Schmittinger Handels- und Vertriebs GmbH, 86459 Gessertshausen | Screw conveyor |
-
1990
- 1990-03-28 DE DE19904009902 patent/DE4009902A1/en not_active Withdrawn
-
1991
- 1991-03-26 CA CA 2079209 patent/CA2079209A1/en not_active Abandoned
- 1991-03-26 EP EP91906707A patent/EP0528808A1/en not_active Withdrawn
- 1991-03-26 JP JP91506809A patent/JPH05505773A/en active Pending
- 1991-03-26 WO PCT/EP1991/000583 patent/WO1991014552A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05505773A (en) | 1993-08-26 |
| DE4009902A1 (en) | 1991-10-02 |
| WO1991014552A1 (en) | 1991-10-03 |
| EP0528808A1 (en) | 1993-03-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |