EP0946347A1 - Procede et dispositif de production d'un element en matiere plastique multicouche - Google Patents

Procede et dispositif de production d'un element en matiere plastique multicouche

Info

Publication number
EP0946347A1
EP0946347A1 EP97952702A EP97952702A EP0946347A1 EP 0946347 A1 EP0946347 A1 EP 0946347A1 EP 97952702 A EP97952702 A EP 97952702A EP 97952702 A EP97952702 A EP 97952702A EP 0946347 A1 EP0946347 A1 EP 0946347A1
Authority
EP
European Patent Office
Prior art keywords
injection molding
plastic part
plastic
component
tool
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Withdrawn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
EP97952702A
Other languages
German (de)
English (en)
Inventor
Norbert VÄTH
Egbert Forstmeyer
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.)
Petri AG
Original Assignee
Petri AG
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 Petri AG filed Critical Petri AG
Publication of EP0946347A1 publication Critical patent/EP0946347A1/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Withdrawn legal-status Critical Current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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/03—Injection moulding apparatus
    • B29C45/04—Injection moulding apparatus using movable moulds or mould halves
    • B29C45/06—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction
    • B29C45/062—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction carrying mould halves co-operating with fixed mould halves
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1615—The materials being injected at different moulding stations
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1679—Making multilayered or multicoloured articles applying surface layers onto injection-moulded substrates inside the mould cavity, e.g. in-mould coating [IMC]
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C2045/1689—Making multilayered or multicoloured articles injecting layers having identical injection cycle times
    • 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
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material

Definitions

  • the invention relates to a method for producing a multilayer plastic part according to the preamble of claim 1 and an apparatus for performing the method.
  • Multi-component plastic technology for producing a plastic part from different materials.
  • the part is first manufactured in its basic structure by introducing a component, which ensures the necessary rigidity and strength of the component. Then a part of the tool is changed so that a cavity is present in the tool on one side of the component, into which the further components can be introduced, which give the part a required surface quality.
  • the invention is therefore based on the object of simplifying the production of a composite part made of plastic and 2-component thermoset. According to the invention this is achieved according to the features of claims 1, 4 and 5.
  • the plastic part and the layer of two-component thermoset are successively injection-molded in the same mold in a cycle-synchronized manner.
  • the plastic body is preferably first injected, and after changing the tool to produce a cavity in the tool corresponding to the thickness of the layer of the 2-component thermoset, the 2-component thermoset is introduced.
  • the cycle synchronization is preferably achieved by adapting the reaction time of the 2-component thermoset to the time for the injection molding of the plastic part. As a rule, a shorter time is required for the injection molding of a plastic part than for the production of a part from two-component thermosetting plastic, so that its reaction time must be shortened.
  • the method is preferably intended for applying a layer of polyurethane to a plastic part.
  • a device for producing a multi-layer plastic part using an injection molding machine is characterized according to the invention in that a RIM device is provided in the injection molding machine for introducing a 2-component thermoset into a multi-component injection molding tool.
  • This device represents a special device for performing the method.
  • the process can also be carried out using a plastic injection molding machine and a RIM system, i.e. Can be carried out with two separate machines that are commercially available. The production takes place in two tools that are linked together.
  • a movable device is provided with at least two injection molding tools, with an injection molding tool of at least one injection nozzle of the injection molding machine and a second injection molding tool of at least one mixing nozzle of the RIM system or the RIM device in the working position Injection molding machine is assigned.
  • the movable device is preferably designed as a rotatable device. If two identical tools are arranged, each tool is alternately connected to the spray nozzle and the mixing nozzle.
  • a handling device and a common control system are expediently provided for linking the injection molding machine and the RIM system.
  • the multi-component cavities of the injection molding machine and the RIM system can be assigned with the handling device.
  • the injection molds have the same mold halves, to which matrices of different depths are assigned on the spray nozzle and on the mixing nozzle, with a space with the dimensions of the plastic part being present between the mold nozzle assigned to the spray nozzle and the respective mold half
  • a free space with the dimensions of the plastic part provided with a foam layer is provided between the die assigned to the mixing nozzle and the respective tool half.
  • the multi-component injection molding tool is preferably made of metal. It is furthermore expedient for the multi-component injection molding tool to have a hidden parting plane in order to avoid burr formation on the visible surface of the parts produced.
  • Figure 1 is a schematic representation of two pivotally arranged tools with parts manufactured therein and with an associated spray and mixing nozzle.
  • Fig. 2 shows the device of FIG. 1 before a spray or. Coating process
  • FIG. 3 shows the device according to FIG. 2 after the end of the spraying or coating process
  • 4a, b show a section of a tool with a hidden parting plane in section; 5 shows a schematic illustration of a device with two tools and handling device;
  • Fig. 6 shows the course of the process over time.
  • each tool half has a base plate 1 which carries two identical tool halves 2, 3 and is rotatably mounted about an axis la.
  • Each tool half is provided with an ejector 4 or 5, each of which has two ejector pins 6, 7 and 8, 9.
  • a die 10 of an injection molding machine 11 and a die 12 of a RIM device 13 are provided opposite the tool halves 2, 3.
  • the die 10 is assigned a spray nozzle 14 and the RIM device 13 a mixing nozzle 15.
  • the die 10 assigned to the injection molding machine 11 has such a profile of its surface 16 that when the die 10 is placed on the patrix there is a free space between the two which corresponds to the thickness of a plastic part 17 to be injection molded.
  • the die 12 assigned to the RIM device 13 has such a profile of its surface 18 that when the die 12 is placed on the patrix there is a free space between the two which corresponds to the thickness of the plastic part 17 provided with a foam layer 19.
  • the base plate 1 can be moved relative to the matrices 10, 12.
  • the tools are shown in the open position, in which the injection molded and provided with a layer 19 of 2-component thermosetting plastic part 17 using the ejector pins 6, 7 the tool half 2 can be removed.
  • the plastic part 17 in the mold half 3 remains there.
  • the base plate 1 After removing the part from the tool half 2, the base plate 1 is rotated by 180 °, so that the tool half 3 with the plastic part 17 now faces the die 12 and the empty tool half 2 faces the die 10, as shown in FIG. 2 .
  • the base plate 1 is moved in the direction of the dies in such a way that the tool half 2 rests on the die 10 and the tool half 3 rests on the die 12 and the tools are thus closed.
  • the plastic part 17 can be produced simultaneously by means of the injection nozzle 14 in the injection molding process and in the other tool the plastic part 17 can be provided with a thermoset layer via the nozzle 15, as shown in FIG. 3.
  • FIGS. 4a and b A special embodiment of the tool is shown in FIGS. 4a and b, in which a concealed division is provided.
  • the tool halves 2, 3, on the one hand, and the dies 10, 12, on the other hand have two dividing planes 20, 21 arranged offset from one another.
  • 4a shows the tool half 2 or 3 and the associated die 10 for the production of the plastic part 17.
  • thermoset layer 19 The following tool for applying the thermoset layer 19 to the plastic part 17 using the Die 12 has identical dividing planes 20, 21 offset by dimension a, as shown in FIG. 4b.
  • the outside of the coated part is burr-free.
  • the burr that appears on the edge is less annoying and may not need to be removed.
  • FIGS. 1 to 3 While an injection molding machine with an integrated RIM device is shown in the embodiment of FIGS. 1 to 3, an injection molding machine 22 and a RIM system 23 are provided in the embodiment of FIG. 5, which are commercially available. These are linked together by a handling device 24, which is only shown in principle, the actuating arm of which can be moved and swiveled both transversely and perpendicularly to the machines placed next to one another, and have a common control.
  • the process sequence is shown again in FIG. 6.
  • plastic is injected into the first tool at a pressure of 800-1000 bar for 2.5 seconds at a temperature of 230 ° C. via the spray nozzle 14.
  • a pressure of 400 bar is then applied over a period of 10 seconds. This is followed by a cooling time of 25 seconds.
  • the manufacturing process of the plastic part 17 is thus completed.
  • the cavity is changed by rotating the base plate 1. This process takes about 6 seconds.
  • the second plastic part 17 is then produced synchronously under the aforementioned conditions and the first plastic part 17 is coated with the foam layer 19 made of polyurethane.
  • the coating is carried out in such a way that two high-pressure pumps, not shown liquid components are poured into the mold via the mixing nozzle 15 at a pressure of 170 to 230 bar in a predetermined mixing ratio within 2.5 seconds. After a reaction time of 30 seconds at a mold temperature of 50 to 70 ° C, the entire first plastic part is removed from the tool.
  • the time-synchronously produced second plastic part is then rotated into the area of the die 12 by rotating the base plate 1 for coating with the foam layer 19.
  • the time-synchronous process described is now repeated, as is also shown in FIG. 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé et un dispositif de production d'un élément en matière plastique multicouche, procédé dans lequel un élément en matière plastique moulé par injection est revêtu d'au moins une couche de matière plastique thermodurcissable à deux composants. Selon le procédé de l'invention, l'élément en matière plastique et la couche à deux composants sont moulés par injection, successivement et en synchronisation de cycle, dans un même outil, et le temps de réaction du plastique thermodurcissable à deux composants est adapté au temps requis pour l'injection de l'élément en matière plastique. Un dispositif de production d'un élément en matière plastique multicouche, avec utilisation d'une presse d'injection est caractérisé en ce qu'il est prévu, dans la presse d'injection (11), un dispositif de moulage réactif par injection (dispositif RIM) (13) pour introduire un plastique thermodurcissable à deux composants dans un outil de moulage par injection multicomposant. Il est ainsi possible d'effectuer simultanément la production d'éléments en matière plastique multicouches, en utilisant plusieurs outils, à savoir, en effectuant, dans un outil, le revêtement d'un élément en matière plastique préalablement produit, cependant que, dans un deuxième outil, on procède déjà au moulage par injection de l'élément suivant.
EP97952702A 1996-11-27 1997-11-25 Procede et dispositif de production d'un element en matiere plastique multicouche Withdrawn EP0946347A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19650854A DE19650854C1 (de) 1996-11-27 1996-11-27 Verfahren und Vorrichtung zur Herstellung eines Mehrschicht-Kunststoffteils
DE19650854 1996-11-27
PCT/DE1997/002824 WO1998023431A1 (fr) 1996-11-27 1997-11-25 Procede et dispositif de production d'un element en matiere plastique multicouche

Publications (1)

Publication Number Publication Date
EP0946347A1 true EP0946347A1 (fr) 1999-10-06

Family

ID=7813961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97952702A Withdrawn EP0946347A1 (fr) 1996-11-27 1997-11-25 Procede et dispositif de production d'un element en matiere plastique multicouche

Country Status (5)

Country Link
EP (1) EP0946347A1 (fr)
JP (1) JP2000516168A (fr)
BR (1) BR9713550A (fr)
DE (1) DE19650854C1 (fr)
WO (1) WO1998023431A1 (fr)

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JP2000516168A (ja) 2000-12-05
DE19650854C1 (de) 1998-03-12
BR9713550A (pt) 2000-01-25
WO1998023431A1 (fr) 1998-06-04

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