EP1057532A1 - Zerkleinerungs- oder Fibrillierungsverfahren - Google Patents

Zerkleinerungs- oder Fibrillierungsverfahren Download PDF

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Publication number
EP1057532A1
EP1057532A1 EP00303980A EP00303980A EP1057532A1 EP 1057532 A1 EP1057532 A1 EP 1057532A1 EP 00303980 A EP00303980 A EP 00303980A EP 00303980 A EP00303980 A EP 00303980A EP 1057532 A1 EP1057532 A1 EP 1057532A1
Authority
EP
European Patent Office
Prior art keywords
fibrillating
sheet material
tension
members
spacer
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Withdrawn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
EP00303980A
Other languages
English (en)
French (fr)
Inventor
designation of the inventor has not yet been filed The
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
Publication of EP1057532A1 publication Critical patent/EP1057532A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/0007—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating documents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
    • B02C18/148—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers specially adapted for disintegrating plastics, e.g. cinematographic films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/0007—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating documents
    • B02C2018/0069—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating documents with stripping devices

Definitions

  • the present invention relates to a shredding or fibrillating method and in particular to a shredding or fibrillating method suitable for shredding or fibrillating plastics materials.
  • Shredding or fibrillating machines generally work by the action of two sets of inter-digitating cutters and spacers, which rotate thereby drawing the material to be shredded or fibrillated towards and through a shredder/fibrillation head which in turn divides the material into filaments.
  • the rotation of the inter-digitating cutters and spacers causes friction which can act upon the film (particularly when the film finds its way in between the cutters and spacers). This friction can cause the plastics film to heat up (and even melt) causing the shredder/fibrillation head to jam.
  • an apparatus for shredding or fibrillating sheet material such as plastics film, comprising a plurality of interdigitating fibrillating members and spacers, each said spacer being generally elongate having a concave arcuate portion extending rearwardly from the leading end thereof.
  • the invention also extends to a spacer for use in such apparatus, and a method of shredding or fibrillating sheet material comprising drawing said sheet material past a plurality of fibrillating members and spacers as defined above.
  • Each elongate spacer preferably comprises two longitudinally extending edges with, preferably, an end portion of a first longitudinally extending edge comprising an acute angled leading end.
  • the concave arcuate portion preferably terminates at a portion of the second longitudinally extending edge which is opposite and (in use) above the acute-angled leading end.
  • spacers there is a plurality of such spacers disposed in a spaced array (preferably being substantially equispaced).
  • spacers of the nature described above helps to ensure that the film can be drawn past the fibrillating members with minimised risk of wrapping around the fibrillating members so as to cause clogging or jamming.
  • the material to be shredded or fibrillated is preferably drawn past a series of inter-digitating fibrillating members and spacers which are at a first tension, and when fibrillation has commenced, the series of inter-digitating fibrillating members and/or the series of spacers are adjusted to a second tension less than the first tension.
  • the invention extends to apparatus for carrying out this method.
  • the spacers according to the second aspect of the invention are generally elongate and comprise a concave arcuate portion, extending rearwardly from the leading end, as defined above.
  • the fibrillating members are preferably provided in a head which is locked into position following adjustment to the second tension.
  • the locking is advantageously carried out with the aid of a locking nut.
  • the plastics film typically comprises a linear, substantially non-cross-linked polymer, such as polyolefin, polyamide, polyethersulphone, polyetherketone (PEEK).
  • Preferred polymers include polypropylene, polyvinyl chloride and polyester.
  • At least a part of the plastics film may be metal-coated. It is preferred that at least one surface of the plastics film is metal-coated and further preferably that both surfaces of the film are metal-coated.
  • a preferred metal is aluminium although other suitable metals include, by way of example, copper, nickel, cobalt, zinc, cadmium, gold and platinum.
  • the term "metal-coated” as used herein is taken to encompass alloy-coated, metal oxide coated and pure metal coated films.
  • the metal coating may be applied to plastics films to a thickness of up to 500 Angstroms which generally gives an optical density in excess of 2.5. Conventional techniques, such as vacuum metallising or sputter coating techniques may be used to apply the metal coating.
  • the shredding or fibrillating method according to the present invention can advantageously shred or fibrillate sheet-like material having a thickness of less than 30 microns. Further advantageously, the plastics film, may be shredded into fibrillar elements of width typically of the order of 1mm, possibly with widths as low as 0.05 to 0.1mm.
  • Figure 1 is a diagrammatic representation of a spacer as used in a method of shredding or fibrillating plastics film, in which there is shown an elongate spacer 1 having an acute-angled leading end 2 and, extending rearwardly from the leading end 2, a concave arcuate portion 3, terminating at an elongate edge 4 of the spacer.
  • a plurality of the spacers as shown in Figure 1 are disposed in an interdigitating manner with intervening fibrillating members (which may be blades needles or the like).
  • the plastics film is drawn towards a shredder/fibrillation head which divides the film into filaments.
  • the width of the filaments can be varied as required by varying spacing between successive fibrillating members.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP00303980A 1999-05-11 2000-05-11 Zerkleinerungs- oder Fibrillierungsverfahren Withdrawn EP1057532A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9910884 1999-05-11
GBGB9910884.7A GB9910884D0 (en) 1999-05-11 1999-05-11 Shredding or fibrillation method

Publications (1)

Publication Number Publication Date
EP1057532A1 true EP1057532A1 (de) 2000-12-06

Family

ID=10853213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00303980A Withdrawn EP1057532A1 (de) 1999-05-11 2000-05-11 Zerkleinerungs- oder Fibrillierungsverfahren

Country Status (2)

Country Link
EP (1) EP1057532A1 (de)
GB (1) GB9910884D0 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960335A (en) * 1971-12-24 1976-06-01 Wilhelm Haberle Comminution device for scrap plastics
DE2526109A1 (de) * 1975-06-11 1976-12-16 Schleicher Co Feinwerktech Schneidwerk einer vorrichtung zum vernichten von blattfoermigem material
DE2749482A1 (de) * 1977-11-04 1979-05-10 Schleicher Co Feinwerktech Schneidwalze eines reisswerkes
GB2061128A (en) * 1979-10-20 1981-05-13 Ofrex Group Ltd Document shredding machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960335A (en) * 1971-12-24 1976-06-01 Wilhelm Haberle Comminution device for scrap plastics
DE2526109A1 (de) * 1975-06-11 1976-12-16 Schleicher Co Feinwerktech Schneidwerk einer vorrichtung zum vernichten von blattfoermigem material
DE2749482A1 (de) * 1977-11-04 1979-05-10 Schleicher Co Feinwerktech Schneidwalze eines reisswerkes
GB2061128A (en) * 1979-10-20 1981-05-13 Ofrex Group Ltd Document shredding machines

Also Published As

Publication number Publication date
GB9910884D0 (en) 1999-07-07

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