WO1995030525A1 - Particules de plastique - Google Patents

Particules de plastique Download PDF

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Publication number
WO1995030525A1
WO1995030525A1 PCT/GB1995/001028 GB9501028W WO9530525A1 WO 1995030525 A1 WO1995030525 A1 WO 1995030525A1 GB 9501028 W GB9501028 W GB 9501028W WO 9530525 A1 WO9530525 A1 WO 9530525A1
Authority
WO
WIPO (PCT)
Prior art keywords
filament
less
powder
plastics material
particles
Prior art date
Application number
PCT/GB1995/001028
Other languages
English (en)
Inventor
Kenneth Craine
Original Assignee
Creaco Limited
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 Creaco Limited filed Critical Creaco Limited
Publication of WO1995030525A1 publication Critical patent/WO1995030525A1/fr

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
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion

Definitions

  • This invention relates to plastics particles and particularly, although not exclusively, relates to a method of manufacturing fine plastics particles which may be used in, for example, the powder coating of metal or glass.
  • Powder coating of metal or glass is well-known. In powder coating, a fine powder is sprayed onto a substrate and then modified in order to produce a thin coating on the substrate.
  • a first class comprises thermoplastic materials, for example Surlyn (Trade Mark) .
  • Surlyn is supplied by the manufacturer in the form of pellets which may be generally cylindrical or cube-shaped and having a maximum diameter or sides of the order of 3mm to 5mm.
  • the pellets are fragmented by grinding.
  • significant heat is released in the grinding process.
  • the material is cooled, usually using liquid nitrogen.
  • a coolant such as liquid nitrogen adds significantly to the cost of manufacturing fine powders of thermoplastic materials and, consequently, the grinding process may only be used to produce particles having a diameter of the order of 100 to 200 ⁇ m.
  • the resulting coating may have a thickness of the order of 400 ⁇ m. This may be thicker than required and, accordingly, a greater quantity of plastics material is used than absolutely necessary. There is, therefore, a need for a method of manufacturing finer thermoplastic particles in a cost-effective manner.
  • thermosetting plastics materials A second class of plastics used in powder coating applications comprises thermosetting plastics materials.
  • the material To prepare fine powder from a thermosetting plastics material, the material is extruded in order to form a thin (about 3mm) sheet. The sheet is then fragmented in order to form chips having an ar ⁇ of the order cf l-2cm 2 . These chips are then further fragmented by grinding. Although heat is generated in the grinding process, there is, in this case, no need to cool the plastics material and, consequently, the material may be ground to form a powder having particles of a diameter of the order of 25 ⁇ m. This powder may be used in powder coating to produce coatings having a thickness of the order of 50 ⁇ m.
  • thermosetting plastics materials are advantageous in some respects over thermoplastic materials, the latter material tends to be cheaper than the former materials and is, therefore, preferentially used in many applications.
  • a method of manufacturing particles of a plastics material including the step of fragmenting a filament, having a diameter of 1000 ⁇ m or less, of the plastics material.
  • the plastics material may be any material that can be formed into a filament.
  • the plastics material is preferably suitable for use in powder coating of a substrate.
  • the plastics material is suitable for use in powder coating utilising an electrostatic process.
  • the plastics material may be a thermoplastic material or a thermosetting material.
  • the material is a thsrmoplastic material.
  • the method may be used for manufacturing particles of a material that has a relatively low melting point, such that the material would melt if subjected to a grinding process and not cooled.
  • a material that has a relatively low melting point
  • Surlyn is an ionomer resin and the invention is of particular interest in relation to such resins.
  • the ionomer resin is a copolymer of c?n optionally substituted alkylene moiety, for example ethylene, with a moiety comprising vinyl monomer having an acid group, for example methacrylic acid.
  • the filament may have any suitable cross-section, for example, square, rectangular, circular or oval-shaped.
  • the term "diameter” as used above refers to the maximum width of the cross-section of a filament.
  • the filament has a circular cross-section.
  • the filament may be made by any suitable means.
  • the filament is manufactured by extrusion.
  • the extrudate is drawn in order to reduce its diameter.
  • the filament may have a diameter of less than 500 ⁇ m.
  • the filament has a diameter of less than 100 ⁇ m. More preferably, the filament has a diameter of less than 60 ⁇ m.
  • the filament preferably has a diameter of at least 5 ⁇ m and, more preferably, at least 10 ⁇ m.
  • Fragmentation of the filament may be carried out using a fragmentation means.
  • Said fragmentation means may be arranged to fragment the filament by any suitable means, for example, by cutting or by crushing at a reduced temperature.
  • fragmentation is carried out by cutting.
  • said Iragmentation means is suitably a blade and may be a rotating or reciprocating blade.
  • Movement means is preferably provided for moving the filament relative to the fragmentation means.
  • Speed * control means may be provided for controlling the speed of the relative movement of the filament relative to the fragmentation means.
  • the filament may be fragmented in order to produce particles having a length of less than 10000 ⁇ m.
  • the filament is fragmented in order to produce particles having a length of less than 1000 ⁇ m. More preferably, the filament is fragmented in order to produce particles having a length of less then 100 ⁇ m. Especially preferred is the case wherein the length is less than 60 ⁇ m.
  • the method is carried out on a bundle of filaments.
  • the diameter of each filament in the bundle may be approximately the same.
  • the diameters of filaments in the bundle may vary.
  • the method is preferably used for manufacturing a powder, being a multiplicity of particles as described above.
  • the size distribution of particles of said powder may vary.
  • the mean particle size (i.e. the maximum dimension of the particle in one direction) of particles of said powder may be less than 500 ⁇ m.
  • the mean particle size of particles of said powder is preferably less than 200 ⁇ m and, more preferably, is less than 100 ⁇ m.
  • the mean particle size may be at least 10 ⁇ m and, preferably, is at least 20 ⁇ m.
  • the invention extends to a method of manufacturing a powder of a plastics material having a mean particle size of less than 500 ⁇ m, the method including the step of fragmenting a filament of the plastics material.
  • the method may be as described in any statement herein.
  • the invention extends to a particle of a plastics material for use in powder coating of a substrate, the particle having a regular cross-section along its length, wherein the diameter of the particle is less than 1000 ⁇ m and the length of the particle is less than 1000 ⁇ m.
  • the particle may be as described in any statement herein.
  • the invention extends to a powder for use in powder coating of a substrate comprising a multiplicity of particles of a plastics material as described above whose mean particle size is less than 500 ⁇ m.
  • the powder may be as described in any statement herein.
  • the invention extends to a method of coating a substrate, the method comprising directing a powder as described above at the substrate. Specific embodiments of the invention will now be described, by way of example.
  • the relative speed of rotation of the receiver and the speed of passage of extrudate from the extruder nozzles may be adjusted in order to vary the diameters of the filaments produced. It is possible to produce filaments having a diameter of lO ⁇ m or even less. In some applications it may be desirable to produce a multiplicity of filaments of substantially identical diameters or, alternatively, filaments having a range of diameters may be produced.
  • the filaments are fragmented by a suitable means, for example, a sheaf of filaments may be presented to a rotating or reciprocating blade which may cut the filaments into fragments having a length of lO ⁇ m or greater.
  • the filaments may be fragmented by firstly chilling them using liquid nitrogen and then crushing the brittle chilled fragments.
  • the above-described method may be used for producing powders from any material that can be drawn into filaments; for example, it may be used for powdering both thermoplastic and thermosetting materials.
  • cutting of the filaments to very short lengths may not readily be possible, since the heat generated during cutting may cause the material to melt.
  • the filaments may be cut to longer lengths, for example of the order of lmm, with the generation of less heat.
  • the longer lengths may then be ground to a very fine powder in a known manner using liquid nitrogen as a coolant. It should be appreciated that this method will use less energy (and will therefore be cheaper) than simply grinding pellets to produce a powder.
  • a powder prepared as described above may be used in any powder coating technology, for example, in coating glass bottles or metal structures, for example garden furniture. Since the powder is very fine, a coating formed using an electrostatic coating process may be relatively thin, for example, of the order of 50-100 ⁇ m.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paints Or Removers (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

Procédé de fabrication de particules fines de plastique consistant à fragmenter un faisceau de filaments allongés de matière plastique, par exemple, en le coupant. Ces filaments peuvent posséder un diamètre égal ou inférieur à 10 νm et peuvent être découpés en fragments égaux ou supérieurs à 10 νm. On peut utiliser ces particules de plastique dans toute technique de revêtement en poudre, par exemple, de revêtement de bouteilles en verre ou de structures métalliques, notamment des meubles de jardin. Etant donné que la poudre obtenue est très fine, le revêtement réalisé au moyen d'un procédé électrostatique peut être relativement fin, par exemple, de l'ordre de 50 à 100 νm.
PCT/GB1995/001028 1994-05-06 1995-05-05 Particules de plastique WO1995030525A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9409193A GB9409193D0 (en) 1994-05-06 1994-05-06 Plastics particles
GB9409193.1 1994-05-06

Publications (1)

Publication Number Publication Date
WO1995030525A1 true WO1995030525A1 (fr) 1995-11-16

Family

ID=10754799

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/001028 WO1995030525A1 (fr) 1994-05-06 1995-05-05 Particules de plastique

Country Status (2)

Country Link
GB (1) GB9409193D0 (fr)
WO (1) WO1995030525A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1069830A (en) * 1965-05-07 1967-05-24 Knapsack Ag Plastic powders for use in heat fusion processes
FR1530320A (fr) * 1967-07-06 1968-06-21 Huels Chemische Werke Ag Procédé de fabrication des poudres de polyamide appropriées pour le revêtement en lit fluidisé
JPS57197119A (en) * 1981-05-29 1982-12-03 Badische Yuka Co Ltd Manufacture of fine particle of ethylene resin
JPS6118428A (ja) * 1984-07-06 1986-01-27 Kao Corp 球状粒子の製造方法
CA2030646A1 (fr) * 1989-12-27 1991-06-28 Richard Brian Allen Procede de fabrication de microparticules thermoplastiques dilatables
EP0489361A2 (fr) * 1990-12-03 1992-06-10 The Dow Chemical Company Granules de polycarbonate à distribution uniforme
JPH07100826A (ja) * 1993-10-06 1995-04-18 Nakata Kooteingu:Kk プラスチック成形用微細ペレットおよび微細ペレットの製造方法と装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1069830A (en) * 1965-05-07 1967-05-24 Knapsack Ag Plastic powders for use in heat fusion processes
FR1530320A (fr) * 1967-07-06 1968-06-21 Huels Chemische Werke Ag Procédé de fabrication des poudres de polyamide appropriées pour le revêtement en lit fluidisé
JPS57197119A (en) * 1981-05-29 1982-12-03 Badische Yuka Co Ltd Manufacture of fine particle of ethylene resin
JPS6118428A (ja) * 1984-07-06 1986-01-27 Kao Corp 球状粒子の製造方法
CA2030646A1 (fr) * 1989-12-27 1991-06-28 Richard Brian Allen Procede de fabrication de microparticules thermoplastiques dilatables
EP0489361A2 (fr) * 1990-12-03 1992-06-10 The Dow Chemical Company Granules de polycarbonate à distribution uniforme
JPH07100826A (ja) * 1993-10-06 1995-04-18 Nakata Kooteingu:Kk プラスチック成形用微細ペレットおよび微細ペレットの製造方法と装置

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8303, Derwent World Patents Index; Class ACG, AN 83-05800K C03! *
DATABASE WPI Section Ch Week 8610, Derwent World Patents Index; Class ABS, AN 86-066050 C10! *
DATABASE WPI Section Ch Week 9136, Derwent World Patents Index; Class ABS, AN 91-260328 C36! *
DATABASE WPI Section Ch Week 9524, Derwent World Patents Index; Class AMB, AN 95-182462 C24! *

Also Published As

Publication number Publication date
GB9409193D0 (en) 1994-06-29

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