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
  • B29C45/1679—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
  • 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
• • 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
  • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
• • 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
  • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
  • B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
  • B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
  • B29C37/0032—In-mould coating, e.g. by introducing the coating material into the mould after forming the article the coating being applied upon the mould surface before introducing the moulding compound, e.g. applying a gelcoat
• • 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
  • B29C45/1628—The materials being injected at different moulding stations using a mould carrier rotatable about an axis perpendicular to the opening and closing axis of the 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
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/26—Moulds
  • B29C45/27—Sprue channels ; Runner channels or runner nozzles
  • B29C45/30—Flow control means disposed within the sprue channel, e.g. "torpedo" construction
• • 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
• • 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
  • B29C45/1615—The materials being injected at different moulding stations
  • B29C45/1628—The materials being injected at different moulding stations using a mould carrier rotatable about an axis perpendicular to the opening and closing axis of the moulding stations
  • B29C2045/1631—The materials being injected at different moulding stations using a mould carrier rotatable about an axis perpendicular to the opening and closing axis of the moulding stations turrets fixed with regard to the machine frame
• • 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
  • B29C2045/1685—Making multilayered or multicoloured articles mounting of the additional injection unit
• • 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
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/26—Moulds
  • B29C45/27—Sprue channels ; Runner channels or runner nozzles
  • B29C45/2701—Details not specific to hot or cold runner channels
  • B29C45/2708—Gates
  • B29C2045/2709—Gates with a plurality of mould cavity inlets in close proximity
• • 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
  • B29C45/0441—Injection moulding apparatus using movable moulds or mould halves involving a rotational movement
  • B29C45/045—Injection moulding apparatus using movable moulds or mould halves involving a rotational movement mounted on the circumference of a rotating support having a rotating axis perpendicular to the mould opening, closing or clamping direction
• • 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
  • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
  • B29C45/1639—Removable partitions between adjacent mould cavity portions
• • 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
• • 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
  • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
  • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
  • B29K2995/002—Coloured
  • B29K2995/0021—Multi-coloured

Definitions

• the present invention relates to an apparatus and a method for producing multi-component plastic parts according to the preambles of claims 1 and 9 or 16.
• a molded part in particular a plastic molded part
• a method is also already used according to which the molded part is inserted into an enlarged cavity, so that a free space is formed between the cavity wall and the inserted molded part.
• a polyurethane material is filled to coat the inserted plastic part. After crosslinking and curing of the polyurethane material, the mold forming the enlarged cavity can be opened and the coated product removed.
• the object of the present invention is to provide an integrated system with which a thermoplastic molding can be coated with at least two different polyurethane materials.
• a closing unit is associated with at least two polyurethane units, each of which can fill its own, separate mold cavities formed by the closing unit, the reactive material provided by them.
• a mold cavity is formed by the closing unit, in which polyurethane material with different material properties can be filled into different partial cavities. The design necessary for this will be described in more detail below.
• Two polyurethane units can be completely separated or use different parts of the system together.
• a switching unit via a single metering machine.
• a component "inline" can be gassed in order to achieve a foam effect.
• “Inline fumigation” can be carried out by means of a CO2 gas.
• a CO2 gas a gas that is used, for example, in a door inner module for a motor vehicle to form the lower area in a thin-walled and compact manner with a first color and to foam the upper parapet area and make it soft with a different color. If only one PUR unit is used, the propellant can be fed separately for each shot.
• the closing unit is also assigned to a plasticizing and injecting device, which can bring the thermoplastic melt in an associated mold.
• the thermoplastic molded body in a first cycle step, can be formed, which is then coated in the subsequent steps with at least two polyurethane materials with different material properties.
• two or more plasticizing and injecting devices are used.
• a closing unit which is particularly suitable for this method, is equipped with a rotatable insert, wherein the insert cooperates with at least two platens. Between the clamping plates and the intermediate insert each forming tools are arranged. Of course, three, four or more platens may be disposed around the insert. For this purpose, the insert must of course be provided with a corresponding number of surfaces for receiving the respective mold parts.
• a particular advantage is given when compared to the mold for the plasticizing and injection unit, a further mold is arranged, so that the closing unit can close both molds in the manner of a sandwich process. If the insert is cube-shaped, identical mold halves can be arranged on all four sides, of which at least two cooperate with mold halves arranged on the clamping plates. In this case, the enlarged cavity or the enlarged cavities would each result in a subsequent transfer step by closing with another mold half on a backing plate.
• this can be introduced into an enlarged cavity, which either has at least two partial cavities which are separated or in which different partial cavities are successively formed by pulling out a drawer or a core pull. Even with this procedure, advantageously, the plasticizing and injection unit can already be integrated into the system. Moreover, it is also possible to use a turning plate closing unit.
• a separating device for the separation of different partial cavities, then this can preferably be formed retractable.
• the retraction may possibly also be done with already closed mold. Especially in the latter case, it is possible to completely fill a partial cavity, so that after opening the mold no free space remains, in which the separator was added.
• a particular advantage when using a plurality of partial cavities is the use of a polyurethane unit which can discharge at least two polyurethane materials with different properties in succession. For this purpose, switching mechanisms are necessary which, for example, provide different material additives (eg different color and / or a gassing of the components, such as CO 2 ) depending on the shot selected.
• the separating device may preferably also be designed such that the switchable flow paths into the various cavity spaces can be realized with it.
• the closing unit with a turntable, a sliding table or an index plate arrangement.
• the individual components are known per se and need not be explained in detail in the present case.
• Figure 1 is a schematic diagram of a first embodiment of a system according to the invention
• Figure 2 is a schematic diagram of a second embodiment of a system according to the invention
• Figure 3 is an enlarged detail cross-sectional view of a mold with switchable flow path.
• FIG. 1 shows a schematic plan view of a first embodiment of a system according to the invention.
• a closing unit 10 is centrally provided, of the present case, however, only platens 12, 14 and 16 and a rotatable about a vertical axis insert 18 are shown.
• traction-transmitting elements such as spars or drives for opening and closing the clamping unit and for applying a closing pressure.
• these design elements are well known in the art and can be presumed for the present invention.
• the insert 18 is present translationally fixed and only rotatable.
• the platens 12, 14 and 16 are respectively slidable in the direction of the insert 18 and in the opposite direction.
• a mold 20, 22 and 24 is arranged between each platen 12, 14 and 16 and the insert 18, a mold 20, 22 and 24 is arranged.
• Each of these molds consists of two mold halves 20 ', 20 “and 22', 22" and 24 ', 24 ", of which the mold halves 20', 22 'and 24' on the insert and the mold halves 20", 22 "and 24 are attached to the platens 12, 14 and 16.
• the mold halves 20 ', 22', 24 'and 25' are identical.
• Kavmaschinesshadow Kavmaschine
• the platen 12 is assigned a plasticizing and injection unit 26 (shown only very schematically), into which a thermoplastic starting material is introduced via a hopper 30.
• a drive 28 the plasticizing and injecting device 26 is driven, thereby melting the starting material and injected in a conventional manner in the cavity of the mold 20.
• the plasticizing and injection unit 26 is shown in the back process state in Figure 1.
• the plasticizing and injecting device 26 is moved forward, so that its injection nozzle adjoins the sprue of the mold 20 for introducing the melt.
• the platen 16 is associated with a first polyurethane unit 32 comprising a mixing head 34 with an outlet tube.
• the mixing head 34 can, as indicated by the double arrow, be moved in the direction of the platen 16 and opposite it. As a result, the mixing head with its outlet pipe can be coupled to a sprue area of the molding tool 24.
• the mixing head 34 is connected via component supply lines 46 and 48 with two containers 38 and 40, in which the two polyurethane components isocyanate and polyol are included. These two components are supplied by means of pumps under high pressure to the mixing head 34.
• the mixing head 34 is connected via a feed line 52 to a paint container 50, from which a first color material is supplied to the mixing head 34.
• the polyurethane components and the coloring material are mixed together in the mixing head and via the outlet pipe discharged.
• the individual metering systems and polyurethane subunits are shown in FIG. 1 only very schematically. In practice, these systems are made somewhat more complex, but the skilled person is sufficiently known due to the diverse state of the art.
• the platen 14 is associated with a second polyurethane unit 32 ', which also comprises a mixing head, which in turn, according to the double arrow, in the direction of the platen 14 and in the opposite direction thereof is movable.
• a mixing head which in turn, according to the double arrow, in the direction of the platen 14 and in the opposite direction thereof is movable.
• the drive for this - as well as the facial expressions is again not shown.
• the mixing head 36 can couple with its outlet pipe to a sprue of the mold 22 so as to be able to transfer the polyurethane mixture in the mold cavity of the mold 22 can.
• the mixing head 36 is in turn coupled to the containers 38 and 40 via the component supply lines 42 and 44 and receives from these via the pumps the components isocyanate and polyol. Of course, separate containers could be provided. Again via a supply line 56, the mixing head 36 is connected to a container 54 for a second color component.
• a plastic melt is produced by means of the plasticizing and injection unit 26 and injected into the cavity of the tool 20.
• the platen 12 is moved away from the insert 12, and after opening the remaining platen 14 and 16, the insert can be rotated 90 ° counterclockwise ( Figure 1).
• the thermoplastic product produced in the previous step is held in the mold half 20 'and carried along accordingly.
• clamping plates 12, 14 and 16 are closed and locked again, which forms an enlarged cavity due to a corresponding shape in the mold 22. This is between the cavity wall of the Forming tool half 22 "and the product formed a space in which now by means of the approached mixing head 36, a polyurethane material is injected.
• a further closing of the platens 12, 14 and 16 a further enlarged cavity is formed in the mold 24 with appropriate formation of the mold half 24 ", in the after approaching the mixing head 34, another polyurethane material with a different material property, eg. a different color, can be injected.
• thermoplastic part coated with different polyurethane materials can thus be produced. If, after the opening of the clamping plates 12, 14 and 16, the turning plate 18 is again rotated by 90 °, then the finished product can be removed at the lower picture position in FIG.
• the two molds 22 and 24 can be assigned injection devices for introducing a release agent onto the cavity surface of the mold halves 22 "and 24". Furthermore, it is possible to provide a removal robot or a robotics for inserting a part.
• FIG. 2 shows a somewhat modified embodiment of a present system according to the invention compared to the illustration in FIG. Now, as compared to Figure 1, the platen 14 as well as the second Polyurethane unit 32 'omitted.
• the mixing head 34 ' is provided in a modified form. Namely, the mixing head 34 'is now adapted for switching the supply of an additive or additive, which can be added to the polyurethane components polyol and isocyanate.
• the mixing head 34 ' is connected via the supply line 56' to a container 54 ', from which the second color can be supplied to the mixing head 34'.
• the mixing head 34 ' now mixes either the first color component or the second color component with the two reaction components polyol and isocyanate and injects this different mixture into partial cavities of the enlarged cavity in the mold 24.
• FIG. 3 shows a schematic detail sectional view of a molding tool, as it can be installed as a molding tool 24 in FIG. 3 includes a first mold half 60 'and a second mold half 60 ", and the first mold half 60' may be attached to the insert.
• a cavity is formed, in which a thermoplastic molded body 68 is already arranged. Between the thermoplastic body 68 and the cavity wall of the mold half 60", a cavity with two partial cavities 66' is provided in an enlarged cavity. The two partial cavities 66 'and 66 "are separated by a separating ruler 70, so that they have no connection to one another.
• the separating ruler 70 is fixed to the mold half 60 "and extends in a closed manner with the mold closed to the thermoplastic molding 68th
• a channel system is formed, wherein - starting from the sprue 62 - a main channel extends to a junction and from there into two sub-channels 62 'and 62" splits. These sub-channels in turn lead into the sub-cavities 66 'and 66 ".
• a switching device in The circuit is indicated by the double arrow Depending on the switching position, the flow path is either from the sprue 62 to the partial cavity 66 'or from the sprue 62 to Generalkavtician 66 "realized.
• a first polyurethane material having a first material property can now be filled into the partial cavity 66'.
• the deflecting flap is switched over and a polyurethane material filled with a second material property in the second Operakavtician.
• the tool 60 ' can be opened and the finished part removed.
• the addition substances can be changed so that the haptics, for example, the softness or hardness of the material changes, also different structures can be created in this way.
• the haptics for example, the softness or hardness of the material changes
• the present invention enables a versatile coating of a thermoplastic material or generally a liner with at least two or more polyurethane materials having different material properties. LIST OF REFERENCE NUMBERS

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=37946350

Family Applications (1)

Country Status (7)

Families Citing this family (13)

Family Cites Families (32)

• 2006
  • 2006-03-07 DE DE102006010310A patent/DE102006010310A1/de not_active Withdrawn
• 2007
  • 2007-01-25 CA CA002643490A patent/CA2643490A1/en not_active Abandoned
  • 2007-01-25 WO PCT/EP2007/050734 patent/WO2007101747A1/de active Application Filing
  • 2007-01-25 EP EP07704130A patent/EP1993803A1/de not_active Withdrawn
  • 2007-01-25 KR KR1020087024376A patent/KR20080109824A/ko not_active Application Discontinuation
  • 2007-01-25 CN CNA2007800035456A patent/CN101374646A/zh active Pending
• 2008
  • 2008-09-05 US US12/204,952 patent/US20090218726A1/en not_active Abandoned

Non-Patent Citations (1)

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