WO2000023236A1 - Method of dry separating paper and plastic film mixtures - Google Patents

Method of dry separating paper and plastic film mixtures Download PDF

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Publication number
WO2000023236A1
WO2000023236A1 PCT/NL1999/000642 NL9900642W WO0023236A1 WO 2000023236 A1 WO2000023236 A1 WO 2000023236A1 NL 9900642 W NL9900642 W NL 9900642W WO 0023236 A1 WO0023236 A1 WO 0023236A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic film
paper
differences
air stream
dry
Prior art date
Application number
PCT/NL1999/000642
Other languages
French (fr)
Inventor
Cornelis Verschut
Original Assignee
Nederlandse Organisatie Voor Toegepastnatuurwetenschappelijk Onderzoek Tno
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 Nederlandse Organisatie Voor Toegepastnatuurwetenschappelijk Onderzoek Tno filed Critical Nederlandse Organisatie Voor Toegepastnatuurwetenschappelijk Onderzoek Tno
Priority to AU63719/99A priority Critical patent/AU6371999A/en
Publication of WO2000023236A1 publication Critical patent/WO2000023236A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/02—Arrangement of air or material conditioning accessories
    • 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
    • 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
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/12—Paper, e.g. cardboard
    • 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
    • B29L2007/00—Flat articles, e.g. films or sheets
    • 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

Definitions

  • the invention relates to a method of dry separating paper and plastic film mixtures.
  • a first object of the present invention is therefore to provide a method of dry separating paper and plastic film mixtures, which method renders it possible to chiefly obtain pure paper and plastic film fractions.
  • the present invention is based on the surprising insight that the deformation and relaxation properties of paper and plastic film are strongly different from each other. For it has been found possible to mechanically deform, contract and relax again the mixture of paper and plastic film or a mixture containing paper and plastic film. After this treatment the plastic film fraction will nearly completely relax into the original form within a short period of time, while the paper shows little or no relaxation. Consequently, the dimension : weight ratio between the materials has changed such that thereupon separation thereof by existing techniques m which particles are separated or the basis of tne differences m falling behavior m an air stream is realizable.
  • the invention therefore relates to a method of dry separating paper and plastic film mixtures m which this mixture is subjected to a treatment m which the behavior properties, m a separation based on differences m falling behavior m an air stream, of the paper and the plastic film are changed with respect to each other and then the thus treated mixture is separated under the influence of these differences at a temperature around room temperature, at least at a temperature not exceeding 50°C.
  • the invention is therefore based on the feature that the ratio of the apparent volume to the weight of the paper is reduced with respect to the same ratio of the plastic film. As soon as this has been done, it will be possible to separate the mixture of paper and plastic film by wind sifting. The relatively light plastic film fraction will then be carried along with the air stream, while the relatively heavy paper fraction will not be carried along with the air stream, so that a separation between the two materials is effected .
  • the invention is applicable to the dry separation of all kinds of paper and plastic film mixtures, for instance mixtures originating from the sorting of household garbage, from industrial paper waste or from collected wastepaper.
  • collected wastepaper often also contains a fraction of plastic film.
  • the mixture is subjected to a mechanical treatment at room temperature, at least at a temperature not exceeding 50°C, at which, as stated, the behavior properties, in a separation based on differences m falling behavior m an air stream, of the paper and the plastic film are changed with respect to each other.
  • Such an apparatus may have different embodiments such as, rotating mixing bodies, eccentrically rotating cones or rollers, extruding or metering screws etc.
  • the household garbage can be separated into different fractions such as organic wet material, paper/plastic film mixtures, glass, rubble, cardboard, ferrous metals etc.
  • a wind sifting technique is often used in the form of a rising sifter (1) .
  • a suction channel Arranged above the household garbage is therefore a mostly vertically disposed suction channel (rising sifter) , through which the relatively light paper/plastic film fraction is carried along by the air stream in the suction channel and thereupon separated from the air stream by means of, for instance, a cyclone (4) .
  • an apparatus (2) with which the ratio of the apparent volume to the weight between paper and plastic film is changed a separation based on differences in falling behavior in an air stream can be carried out thereupon in a series-connected wind sifter (3) .
  • the discharge of the paper takes place via a rotating lock (5) disposed at the underside of the wind sifter.
  • the plastic film is separated from the air stream and then collected via a rotating lock (6) .
  • the apparatus (2) with which the ratio between the apparent volume and the weight of the individual paper and plastic film .fractions is changed consists, for instance, of a rotating mixing body placed in the suction channel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

The invention relates to a method of dry separating paper and plastic film mixtures, wherein a mixture containing paper and plastic film is subjected to a treatment in which the behavior properties, in a separation based on differences in falling behavior in an air stream, of the paper and the plastic film are changed with respect to each other and then the thus treated mixture can be dry separated under the influence of these differences into paper and plastic film fractions by means of, for instance, a wind sifter.

Description

Title. Method of dry separating paper and plastic film mixtures
The invention relates to a method of dry separating paper and plastic film mixtures.
When reprocessing waste, for instance fractions originating from the sorting of household garbage, packing wastes, and when recycling wastepaper, the problem often arises that dry mixtures of paper and plastic film can hardly, if at all, be separated by the conventional techniques. A problem with this separation is that the densities, size and form of the paper and the plastic film are generally highly similar. Consequently, conventional techniques based on the principle of separation on the basis of differences m density, size and form are not applicable. Such a separation technique is wind sifting m which particles are separated on the basis of the difference in falling behavior m an air stream. The falling behavior of particles in an air stream is particularly determined by the density, size and form of the particles.
A first object of the present invention is therefore to provide a method of dry separating paper and plastic film mixtures, which method renders it possible to chiefly obtain pure paper and plastic film fractions.
The present invention is based on the surprising insight that the deformation and relaxation properties of paper and plastic film are strongly different from each other. For it has been found possible to mechanically deform, contract and relax again the mixture of paper and plastic film or a mixture containing paper and plastic film. After this treatment the plastic film fraction will nearly completely relax into the original form within a short period of time, while the paper shows little or no relaxation. Consequently, the dimension : weight ratio between the materials has changed such that thereupon separation thereof by existing techniques m which particles are separated or the basis of tne differences m falling behavior m an air stream is realizable.
The invention therefore relates to a method of dry separating paper and plastic film mixtures m which this mixture is subjected to a treatment m which the behavior properties, m a separation based on differences m falling behavior m an air stream, of the paper and the plastic film are changed with respect to each other and then the thus treated mixture is separated under the influence of these differences at a temperature around room temperature, at least at a temperature not exceeding 50°C.
The invention is therefore based on the feature that the ratio of the apparent volume to the weight of the paper is reduced with respect to the same ratio of the plastic film. As soon as this has been done, it will be possible to separate the mixture of paper and plastic film by wind sifting. The relatively light plastic film fraction will then be carried along with the air stream, while the relatively heavy paper fraction will not be carried along with the air stream, so that a separation between the two materials is effected .
The invention is applicable to the dry separation of all kinds of paper and plastic film mixtures, for instance mixtures originating from the sorting of household garbage, from industrial paper waste or from collected wastepaper. In this connection it is observed that because of the often employed method of sending periodicals m plastic film, collected wastepaper often also contains a fraction of plastic film. To carry out the method of the invention, the mixture is subjected to a mechanical treatment at room temperature, at least at a temperature not exceeding 50°C, at which, as stated, the behavior properties, in a separation based on differences m falling behavior m an air stream, of the paper and the plastic film are changed with respect to each other. Such an apparatus may have different embodiments such as, rotating mixing bodies, eccentrically rotating cones or rollers, extruding or metering screws etc.
The invention will now be explained with reference to the figure which is a diagrammatic representation of the total system.
In household garbage sorting plants the household garbage can be separated into different fractions such as organic wet material, paper/plastic film mixtures, glass, rubble, cardboard, ferrous metals etc. To separate a relatively clean and dry paper/plastic film fraction, a wind sifting technique is often used in the form of a rising sifter (1) . Arranged above the household garbage is therefore a mostly vertically disposed suction channel (rising sifter) , through which the relatively light paper/plastic film fraction is carried along by the air stream in the suction channel and thereupon separated from the air stream by means of, for instance, a cyclone (4) . By including in this system an apparatus (2) with which the ratio of the apparent volume to the weight between paper and plastic film is changed a separation based on differences in falling behavior in an air stream can be carried out thereupon in a series-connected wind sifter (3) . The discharge of the paper takes place via a rotating lock (5) disposed at the underside of the wind sifter. In the cyclone (4) the plastic film is separated from the air stream and then collected via a rotating lock (6) . The apparatus (2) with which the ratio between the apparent volume and the weight of the individual paper and plastic film .fractions is changed consists, for instance, of a rotating mixing body placed in the suction channel.

Claims

Claims
1. A method of dry separating paper and plastic film mixtures, wherein a mixture containing paper and plastic film is subjected to a treatment in which the behavior properties, in a separation based on differences in falling behavior in an air stream, of the paper and the plastic film are changed with respect to each other and then the thus treated mixture can be dry separated under the influence of these differences into paper and plastic film fractions at a temperature not exceeding 50°C.
2. A method according to claim 1, wherein said separation based on differences in falling behavior in an air stream is realized by means of wind sifting or corresponding techniques .
3. A method according to claim 1 or 2 , wherein said treatment is carried out such that the ratio of the apparent volume to the weight of the paper is reduced with respect to the same ratio of the plastic film.
4. A method according to claims 1-3, wherein the mixture of paper and plastic originates from the sorting of household garbage, from industrial paper waste or from collected wastepaper .
PCT/NL1999/000642 1998-10-16 1999-10-18 Method of dry separating paper and plastic film mixtures WO2000023236A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63719/99A AU6371999A (en) 1998-10-16 1999-10-18 Method of dry separating paper and plastic film mixtures

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1010338 1998-10-16
NL1010338A NL1010338C2 (en) 1998-10-16 1998-10-16 Method for dry separation of paper and plastic film mixtures.

Publications (1)

Publication Number Publication Date
WO2000023236A1 true WO2000023236A1 (en) 2000-04-27

Family

ID=19767976

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1999/000642 WO2000023236A1 (en) 1998-10-16 1999-10-18 Method of dry separating paper and plastic film mixtures

Country Status (3)

Country Link
AU (1) AU6371999A (en)
NL (1) NL1010338C2 (en)
WO (1) WO2000023236A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103587004A (en) * 2013-10-15 2014-02-19 常州思宇环保材料科技有限公司 Device for sorting plastic in papermaking garbage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814240A (en) * 1972-09-13 1974-06-04 Us Agriculture Separation of thermoplastic film and wastepaper
GB1593220A (en) * 1977-05-31 1981-07-15 Esmil Bv Separation of a mixture of paper and plastics foil
EP0034382A2 (en) * 1980-02-08 1981-08-26 Esmil B.V. Method of separating paper and plastics pieces and separating means therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814240A (en) * 1972-09-13 1974-06-04 Us Agriculture Separation of thermoplastic film and wastepaper
GB1593220A (en) * 1977-05-31 1981-07-15 Esmil Bv Separation of a mixture of paper and plastics foil
EP0034382A2 (en) * 1980-02-08 1981-08-26 Esmil B.V. Method of separating paper and plastics pieces and separating means therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103587004A (en) * 2013-10-15 2014-02-19 常州思宇环保材料科技有限公司 Device for sorting plastic in papermaking garbage

Also Published As

Publication number Publication date
AU6371999A (en) 2000-05-08
NL1010338C2 (en) 2000-04-20

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