EP0969954A2 - Method at the manufacturing of a recyclable product material - Google Patents

Method at the manufacturing of a recyclable product material

Info

Publication number
EP0969954A2
EP0969954A2 EP19960931324 EP96931324A EP0969954A2 EP 0969954 A2 EP0969954 A2 EP 0969954A2 EP 19960931324 EP19960931324 EP 19960931324 EP 96931324 A EP96931324 A EP 96931324A EP 0969954 A2 EP0969954 A2 EP 0969954A2
Authority
EP
European Patent Office
Prior art keywords
fibre
product material
matrix
moduli
materials
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Withdrawn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
EP19960931324
Other languages
German (de)
French (fr)
Inventor
Leif Jilken
Stig Nilsson
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.)
Polyplank AB
Original Assignee
Polyplank AB
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 Polyplank AB filed Critical Polyplank AB
Publication of EP0969954A2 publication Critical patent/EP0969954A2/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Withdrawn legal-status Critical Current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
    • B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
    • 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 present invention relates to a method for the manufacture of a recyclable product material, comprising at least one matrix material and at least one fibre material in order to achieve a predetermined strength within a predetermined strain rate interval in the product material.
  • the object of the present invention is to achieve a predetermined strength for a predetermined strain rate interval in a recyclable product material of the said type, in order to thereby eliminate or at least reduce the effect of the said disadvantages associated with earlier manufacture of recyclable product material. To do this it is necessary to produce the greatest internal microstresses possible in the product material.
  • This is achieved according to the invention in that in different volume elements ofthe product material the matrix and fibre materials are selected so that the values for their moduli of elasticity, shear moduli and Poisson's ratios assume a discontinuous distribution, and that a continuous distribution of a display curve defining the fibre size ofthe product material exhibits symmetry.
  • the form factor of the fibre material/the mixed fibre materials exhibits a dispersion by means of which a majority of fibres can be made to bridge islands of inhomogeneities which would otherwise give rise to defective adhesion between the fibres.
  • the said distributions are preferably so great that the fact that one or more ofthe matrix/fibre materials is contaminated does not have a detrimental effect on the strength of the product material.
  • the respective form factors of the said fibre material are such that the particle size ofthe contaminations is exceeded, that is to say the fact one or more ofthe matrix fibre materials is contaminated does not have a detrimental effect on the strength ofthe product material.
  • fig.l is an example of a display curve in the method according to the invention.
  • Fig.2 shows various volume elements in a product material.
  • the manufacture of a recyclable product material by the method according to the invention is done using equipment of conventional type familiar to the person skilled in the art, supplemented by measuring devices for checking the moduli of elasticity and moduli in shear of the matrix and fibre materials, together with the Poisson's ratios calculated from these values. Should the discontinuous distribution of the above-mentioned quantities characteristic ofthe invention not be obtained, a manual or automatic correction is performed, whereupon that material in which the quantities did not attain the discontinuous distribution is fed back into the process, that is to say the material passes through the process one more time.
  • the display curve defining the fibre size ofthe product material reference is made to the example in fig.1.
  • the agglomerate/granulate has a maximum diameter of 4mm.
  • the majority of the fibres have here been chosen with lengths of about 2mm with a dispersion according to the curve.
  • Fig.2 is intended to show a specimen 1 of a recyclable product material manufactured by the method according to the invention.
  • Agglomerate/granulate have been combined as N volume elements lal, la2 ... with different preferred alignments of the fibres, which are included in the various volume elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforced Plastic Materials (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Processing Of Solid Wastes (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a method for the manufacture of a recyclable product material in order to achieve a predetermined strength within a predetermined strain rate interval. The product material comprises at least one matrix material and at least one fibre material. The matrix and fibre materials are chosen so that the values of their moduli of elasticity (Eij), moduli in shear (Gij) and the Poisson's ratios (ωij) assume a discontinuous distribution of the said matrix and fibre material quantities within different volume elements of the product material. It is further intended that a display curve defining a continuous distribution of a fibre size of the product material should exhibit symmetry in different volume elements of the product material.

Description

Method at the manufacturing of a recyclable product material
The present invention relates to a method for the manufacture of a recyclable product material, comprising at least one matrix material and at least one fibre material in order to achieve a predetermined strength within a predetermined strain rate interval in the product material.
Only recently has the handling of returnable plastic for recycling the latter assumed the priority which is desirable with regard, among other things, to environmental aspects, economic use of energy etc. People have begun, with some success, for example, to collect packaging film from agriculture and industry in order to manufacture granulate from the returned film.
WO 93/25609 and WO 94/09959, for example, are already known in this field. These publications describe methods and appliances for recycling returnable plastic and fibres.
One problem with this is the degree of contamination and the large number of different types of plastic with different melt indices exhibited by the returnable plastic, as a result of which the manufactured product material does not achieve the predetermined strength. The problem is related to the fact that the granulate nozzle and filtering equipment become clogged, which gives a very inhomogeneous final product.
In the above-mentioned publications there was no indication of any solution to this strength problem.
The object of the present invention is to achieve a predetermined strength for a predetermined strain rate interval in a recyclable product material of the said type, in order to thereby eliminate or at least reduce the effect of the said disadvantages associated with earlier manufacture of recyclable product material. To do this it is necessary to produce the greatest internal microstresses possible in the product material. This is achieved according to the invention in that in different volume elements ofthe product material the matrix and fibre materials are selected so that the values for their moduli of elasticity, shear moduli and Poisson's ratios assume a discontinuous distribution, and that a continuous distribution of a display curve defining the fibre size ofthe product material exhibits symmetry.
According to another special characteristic ofthe invention the form factor of the fibre material/the mixed fibre materials, that is the ratio of fibre length to fibre diameter, exhibits a dispersion by means of which a majority of fibres can be made to bridge islands of inhomogeneities which would otherwise give rise to defective adhesion between the fibres.
As will be appreciated from a further special characteristic ofthe invention, the said distributions are preferably so great that the fact that one or more ofthe matrix/fibre materials is contaminated does not have a detrimental effect on the strength of the product material.
According to further characteristics ofthe invention the respective form factors of the said fibre material are such that the particle size ofthe contaminations is exceeded, that is to say the fact one or more ofthe matrix fibre materials is contaminated does not have a detrimental effect on the strength ofthe product material.
Further advantages ofthe invention will be evident from the following description of this, referring to the drawing in which fig.l is an example of a display curve in the method according to the invention. Fig.2 shows various volume elements in a product material.
The manufacture of a recyclable product material by the method according to the invention is done using equipment of conventional type familiar to the person skilled in the art, supplemented by measuring devices for checking the moduli of elasticity and moduli in shear of the matrix and fibre materials, together with the Poisson's ratios calculated from these values. Should the discontinuous distribution of the above-mentioned quantities characteristic ofthe invention not be obtained, a manual or automatic correction is performed, whereupon that material in which the quantities did not attain the discontinuous distribution is fed back into the process, that is to say the material passes through the process one more time.
With regard to the display curve defining the fibre size ofthe product material, reference is made to the example in fig.1. In this display curve it is assumed that the agglomerate/granulate has a maximum diameter of 4mm. The majority of the fibres have here been chosen with lengths of about 2mm with a dispersion according to the curve.
Fig.2 is intended to show a specimen 1 of a recyclable product material manufactured by the method according to the invention. Agglomerate/granulate have been combined as N volume elements lal, la2 ... with different preferred alignments of the fibres, which are included in the various volume elements. This consequently means, according to the invention, that for each such volume element the values of the modulus of elasticity (Eυ), the modulus in shear (G,j) and the Poisson's ratio (υ.j) will differ from the values of similar quantities for adjacent volume elements. This confers great internal couple stresses.

Claims

Claims.
1. Method for the manufacture of a recyclable product material, comprising at least one matrix material and at least one fibre material in order to achieve a predetermined strength within a predetermined strain rate interval in the product material, characterised in that in different volume elements ofthe product material the matrix and fibre materials are selected in such a way that the values of their moduli of elasticity (E(J), the moduli in shear (GtJ) and the Poisson's ratios (υυ) assume a discontinuous distribution and that a display curve defining a continuous distribution of fibre size of the product material exhibits symmetry.
2. Method according to claim 1, characterised in that through the choice of a fibre material or mixture of at least two fibre materials it is ensured that the display curve of the fibre material/the mixed fibre materials is approximately symmetrical about a predetermined mean value.
3. Method according to claim 1, characterised in that the form factor ofthe fibre material/the mixed fibre materials, that is the ratio of fibre length to fibre diameter, exhibits dispersion.
4. Method according to claim 3, characterised in that the respective form factors of the said fibre materials are such that the particle size ofthe contaminations is exceeded, that is to say that the fact that one or more of the matrix/fibre materials is contaminated does not have a detrimental effect on the strength of the product material.
EP19960931324 1995-09-14 1996-09-10 Method at the manufacturing of a recyclable product material Withdrawn EP0969954A2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9503190 1995-09-14
SE9503190A SE504882C2 (en) 1995-09-14 1995-09-14 Method of producing a recyclable product material
PCT/SE1996/001124 WO1997010935A1 (en) 1995-09-14 1996-09-10 Method at the manufacturing of a recyclable product material

Publications (1)

Publication Number Publication Date
EP0969954A2 true EP0969954A2 (en) 2000-01-12

Family

ID=20399487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960931324 Withdrawn EP0969954A2 (en) 1995-09-14 1996-09-10 Method at the manufacturing of a recyclable product material

Country Status (8)

Country Link
EP (1) EP0969954A2 (en)
JP (1) JP2000500167A (en)
AU (1) AU700632B2 (en)
CA (1) CA2231811A1 (en)
NO (1) NO981060D0 (en)
PL (1) PL325465A1 (en)
SE (1) SE504882C2 (en)
WO (1) WO1997010935A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11360130B2 (en) 2019-06-20 2022-06-14 Schneider Electric USA, Inc. Distributed electrical energy meter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL105950A0 (en) * 1992-06-09 1993-10-20 Baker Richard D Recycled fibre reinforced resin containing product and method and apparatus therefor
DE4236446A1 (en) * 1992-10-28 1994-05-05 Herfeld Gmbh & Co Kg Dr Process for the production of a recyclable agglomerate from plastic waste

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9710935A1 *

Also Published As

Publication number Publication date
JP2000500167A (en) 2000-01-11
AU7003896A (en) 1997-04-09
CA2231811A1 (en) 1997-03-27
SE9503190D0 (en) 1995-09-14
SE9503190L (en) 1997-03-15
AU700632B2 (en) 1999-01-07
SE504882C2 (en) 1997-05-20
PL325465A1 (en) 1998-07-20
NO981060L (en) 1998-03-11
NO981060D0 (en) 1998-03-11
WO1997010935A1 (en) 1997-03-27

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