EP0981430A1 - Procede et appareil servant a former des articles en matiere plastique par chauffage de cette matiere plastique par vibrations ultrasoniques - Google Patents

Procede et appareil servant a former des articles en matiere plastique par chauffage de cette matiere plastique par vibrations ultrasoniques

Info

Publication number
EP0981430A1
EP0981430A1 EP99905130A EP99905130A EP0981430A1 EP 0981430 A1 EP0981430 A1 EP 0981430A1 EP 99905130 A EP99905130 A EP 99905130A EP 99905130 A EP99905130 A EP 99905130A EP 0981430 A1 EP0981430 A1 EP 0981430A1
Authority
EP
European Patent Office
Prior art keywords
mass
polymeric material
chamber
plastic
viscous
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Withdrawn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
EP99905130A
Other languages
German (de)
English (en)
Inventor
Giuliano Rivi
Erminio Diolaiti
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.)
DIOLAITI Luigi
Original Assignee
DIOLAITI Luigi
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 DIOLAITI Luigi filed Critical DIOLAITI Luigi
Publication of EP0981430A1 publication Critical patent/EP0981430A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/0261—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using ultrasonic or sonic vibrations
    • 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
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/022—Melting the material to be shaped
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/251—Particles, powder or granules

Definitions

  • the present invention relates to a method and an apparatus for forming items made of polymeric plastic material.
  • apparatuses that generally comprise a housing chamber for a mass of polymeric material - in general, fed in the form of powders or granular material - which is in connection with a mould or a nozzle for forming the item, where the plastic material is sent by means of compression imparted on the mass in said housing chamber, after said mass has been reduced to a plastic state suitable for forming.
  • a further excessive energy expenditure by prior art machines is due to the excessive use of compression force imparted on the plastic material in order to obtain, in contact with the pressing element, a honey-like state or viscous condition of the plastic material that favours the intervention of the heating means to bring the entire plastic mass into the fluid or plastic state suitable for the work process. Disclosure of Invention
  • An aim of the present invention is therefore to provide a method and an apparatus for forming an item made of polymeric plastic material wherein the fluidisation phase of the plastic mass to be formed is accomplished with low energy expenditure.
  • said electrical heating resistors in order to obtain an effective heating of the plastic mass, are positioned circumferentially in correspondence with said chamber for the compression and fluidisation of the polymeric material with the further drawback of occupying a certain amount of space which makes said apparatuses bulky and complex.
  • aims of the present invention therefore are those of providing an apparatus for forming an item made of polymeric plastic material that presents a simple, minimally sized and inexpensive structure.
  • the above is attained thanks to a method according to claim 1 and, in particular, through a method for forming items made of polymeric material, comprising the phases of bringing a mass of polymeric material to a pre-set viscous condition suitable for obtaining the plastic item, and of forming said mass of polymeric material according to the desired shape to obtain said item; the method being characterised in that, in order to bring said mass of polymeric material into the pre-set viscous condition, ultrasonic vibrations are sent on the mass itself.
  • the present invention further relates to an apparatus according to claim 5.
  • FIG. 1 shows a schematic and exemplifying view of a first preferred apparatus for the realisation of the present method for forming an item made of polymeric plastic material
  • - Figure 2 shows a schematic and exemplifying view of a second preferred apparatus for the realisation of the present method for forming an item made of polymeric plastic material.
  • a preferred embodiment of the apparatus 10 for the realisation of the method of the present invention comprises a hermetically sealed chamber 12 for housing a mass 14 of polymeric material presenting at least one opening or a nozzle 16, used for the exit from chamber 12 of said mass 14 made of polymeric material in a viscous condition suitable to obtain an item, indicated by the generic reference A in the figure.
  • the apparatus also comprises suitable means for feeding the plastic material into said chamber of the apparatus, exemplified in the present case by hopper T, whereon the plastic material is loaded in granular or powder form 18.
  • suitable means D Downstream of said feeding means are provided suitable means D for dosing the quantity of plastic material in granules to be introduced inside said chamber 12, which transfer to the chamber 12, through suitable one-way means 20 and a corresponding insertion opening 22 provided in the outer wall 23 contouring the chamber, the predetermined dose of load of plastic material to said chamber 12.
  • said forming means can comprise a suitably shaped nozzle 16 or an actual mould (not shown in the figure) within which said plastic material in fluid or viscous condition is introduced under pressure.
  • said fluid mass is compressed by suitable compression means, exemplified in the figure by the piston 24 able to slide longitudinally within said chamber 12.
  • Said piston 24 being able, if need be, to be also used to create inside the chamber a vacuum suitable for drawing a subsequent dose of replenishment plastic material 18 in granular form into the chamber itself.
  • the operations of actuating the compression means are performed thanks to suitable driving means M.
  • said means to bring said mass of polymeric material to the pre-set viscous condition comprise a source of ultrasound energy or sonotrode device S which sends energy in the form of ultrasonic vibrations to said mass 14 of polymeric material.
  • said source of ultrasonic vibrations S is positioned on the side of the chamber 12 that is opposite to the one occupied by said compression means 24.
  • said vibration source for instance on a side wall of the housing chamber 12, can be imagined.
  • the nozzle 16 for emitting the plastic in the viscous state is advantageously provided on the side wall of the chamber 12 in the vicinity of the surface of the vibrating element that is in contact with the plastic mass, where the polymeric material reaches its viscous condition.
  • the reference letter C indicates centralised control means preferably in the form of an electronic processing unit commanded with a program and, possibly, with the aid of suitable sensor means in appropriate areas of the machine.
  • control means C it is possible to co-ordinate the intervention times of the dosing means D, of the means M for driving the piston 24 and of the ultrasound emission source S to obtain the production of the plastic material items A.
  • FIG. 2 shows a second preferred embodiment 100 of the apparatus for realising the method of the present invention.
  • This second preferred embodiment presents most components that are wholly identical to those of the preceding first preferred realisation and hence are not commented again.
  • the present second preferred embodiment 100 is distinguished from the first in that the emission of the plastic material from the chamber 12 takes place through a conduit 160 that is obtained inside the sonotrode S. In this way a greater transfer of ultrasonic device to the plastic mass can be obtained, thereby increasing the work efficiency of the apparatus.
  • the plastic material that is preferably used is constituted by a thermoplastic plastic material.
  • other plastic materials can be used as well, provided they are suitable for the present work processes.
  • the method of the present invention could be applied to any kind of work process for the production of items made of plastic material, such as extrusion, compression moulding, injection moulding, transfer moulding, extrusion and blowing moulding and others .

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne un procédé et un appareil servant à former des articles (A) en matière polymère. Ce procédé consiste à amener une masse de matière polymère (14) à un état fluide ou visqueux défini qui permette d'obtenir l'article (A) plastique. Le procédé consiste ensuite à donner par moulage à ladite masse de matière polymère (14) une forme définie voulue. Pour amener ladite masse de matière polymère (14) à l'état visqueux défini, on lui envoie des vibrations ultrasoniques.
EP99905130A 1998-03-12 1999-03-10 Procede et appareil servant a former des articles en matiere plastique par chauffage de cette matiere plastique par vibrations ultrasoniques Withdrawn EP0981430A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT98BO000155A IT1299900B1 (it) 1998-03-12 1998-03-12 Procedimento ed apparecchio per la formatura con l'ausilio di ultrasuoni di articoli in materiale plastico.
ITBO980155 1998-03-12
PCT/IB1999/000389 WO1999046098A1 (fr) 1998-03-12 1999-03-10 Procede et appareil servant a former des articles en matiere plastique par chauffage de cette matiere plastique par vibrations ultrasoniques

Publications (1)

Publication Number Publication Date
EP0981430A1 true EP0981430A1 (fr) 2000-03-01

Family

ID=11343026

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99905130A Withdrawn EP0981430A1 (fr) 1998-03-12 1999-03-10 Procede et appareil servant a former des articles en matiere plastique par chauffage de cette matiere plastique par vibrations ultrasoniques

Country Status (6)

Country Link
EP (1) EP0981430A1 (fr)
CN (1) CN1258245A (fr)
AU (1) AU2541599A (fr)
CA (1) CA2290099A1 (fr)
IT (1) IT1299900B1 (fr)
WO (1) WO1999046098A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2471644A1 (fr) * 2010-12-31 2012-07-04 Fundació Privada Ascamm Système et procédé de moulage de micro et mini pièces en plastique
CN102490301A (zh) * 2011-12-16 2012-06-13 深圳大学 一种微零件粉末模压成型方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1805090A1 (de) * 1968-10-25 1970-05-21 Bosch Gmbh Robert Verfahren und Vorrichtung zum Herstellen von Gegenstaenden aus Kunststoff
EP0394958A3 (fr) * 1989-04-25 1991-11-13 Idemitsu Kosan Company Limited Procédé et dispositif de plastification de matériau à mouler
DE4106645A1 (de) * 1991-03-02 1992-09-03 Philips Patentverwaltung Vorrichtung zur ueberfuehrung von plastischen massen in einen zustand erniedrigter viskositaet

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9946098A1 *

Also Published As

Publication number Publication date
ITBO980155A0 (it) 1998-03-12
CN1258245A (zh) 2000-06-28
CA2290099A1 (fr) 1999-09-16
ITBO980155A1 (it) 1999-09-12
IT1299900B1 (it) 2000-04-04
AU2541599A (en) 1999-09-27
WO1999046098A1 (fr) 1999-09-16

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