WO2004085138A1 - Mischkopf für eine reaktionsgiessmaschine - Google Patents
Mischkopf für eine reaktionsgiessmaschine Download PDFInfo
- Publication number
- WO2004085138A1 WO2004085138A1 PCT/EP2004/002003 EP2004002003W WO2004085138A1 WO 2004085138 A1 WO2004085138 A1 WO 2004085138A1 EP 2004002003 W EP2004002003 W EP 2004002003W WO 2004085138 A1 WO2004085138 A1 WO 2004085138A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mixing head
- bore
- head according
- piston
- inoculation
- Prior art date
Links
Classifications
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- 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
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/76—Mixers with stream-impingement mixing head
- B29B7/7631—Parts; Accessories
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- 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
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7404—Mixing devices specially adapted for foamable substances
-
- 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
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/76—Mixers with stream-impingement mixing head
- B29B7/7615—Mixers with stream-impingement mixing head characterised by arrangements for controlling, measuring or regulating, e.g. for feeding or proportioning the components
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- 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
- 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 present invention relates to a mixing head of a reaction casting machine according to the preamble of patent claim 1
- deflecting mixing head in which a mixing chamber is arranged at a right angle to an outlet pipe for the finished mixture.
- a movable control piston is movably mounted in the mixing chamber and the reactive components are introduced into the mixing chamber at high pressure from the addition devices.
- the components mix, with the beam direction of the supplied components in particular also
- the control piston which is movably arranged in the mixing chamber, is designed in such a way that it has circuit grooves, which ensures that the addition devices for the reactive components are always under pressure, and in a so-called rest phase, that is to say if no mixing of the components is to take place, each Component can circulate back into the respective reservoir for the corresponding component via a circuit groove.
- Another known mixing head design is the so-called circular groove mixing head in connection with calming pens.
- a longitudinal axis of the mixing chamber is identical to the discharge direction, and several settling pins are arranged at the mixing chamber outlet, which ensure that the emerging reaction mixture does not have an inhomogeneous flow distribution.
- the reactive components are injected into the mixing chamber under high pressure during the mixing process, and are circulated back into the respective reservoirs via circuit grooves in a control piston during a resting phase.
- mixing heads are found, for example, in the plastic machine operator, publisher Dr.-Ing. Friedrich Johannaber, 3rd edition, described by Carl Hanser Verlag.
- the additional component is fed into the mixing chamber at the same time as the reactive components, the feed usually taking place via controllable valves, for example needle valves.
- the feed device for the additional component is provided in the wall of the mixing chamber at the same level as the feed device for the reactive components.
- Such an embodiment is known, for example, from DE 41 40 787 C1, in which the control of the valves of feed devices and addition devices takes place via a control disk arranged rotatably about the axis of the mixing chamber, which makes it possible to exactly synchronize the addition of the individual components.
- changes in the composition of the components fed in can only be carried out with great effort.
- mount the feed device in relation to the discharge direction in front of the addition devices for the reactive components, which ensures that the additional components are mixed very well in any case.
- the paint can be fed into the mixing chamber via one end of the control piston. In any case, the size of the mixing chamber limits the number of additional components that can be added.
- a mixing head for a reaction casting machine which has a mixing chamber with addition devices for at least two reactive components, in particular polyol and polyisocyanate, and at least one inoculation hole for the supply of at least one additional component, in particular a paint, is characterized according to the invention in that at least two supply devices for supplying different additional components, for example two different colors, and a movable connection unit are provided, which serves to connect the at least two supply devices optionally to the at least one inoculation bore, via which the respective additional component is fed into the mixing chamber of the mixing head becomes.
- the at least two reactive components which are preferably under high pressure, and the additional component are simultaneously fed into the mixing chamber, where they mix to form a homogeneous mixture.
- various mixing head geometries are known from the prior art.
- An advantage of the present invention is that the additional component can be optionally changed from mixing head filling to mixing head filling.
- a mixing head according to the invention is accordingly more flexible than Conventional mixing heads can be used, as the color can change from shot to shot, for example. B. in the production of diverse similar parts with different colors directly in succession or of large-area automotive interior parts with different layers is of great interest.
- the at least two feed devices for the additional components are particularly preferably integrated into the movable connecting unit, which alternately connects them to the inoculation bore. By moving the connecting unit, one outlet opening of a feed device is brought into line with the inoculation bore.
- the mixing chamber of a mixing head according to the invention is advantageously designed in such a way that the addition devices for the reactive components and the inoculation bore lie essentially in the same plane perpendicular to a discharge direction of the mixing chamber. This ensures that the reactive components are optimally mixed with the additional components. This is the case in particular when the reactive components are under high pressure and are injected into the mixing chamber essentially in a mutually directed manner, so that due to the resulting vortex formation they are particularly good with one another but also with the additional feed fed in at the same height of the mixing chamber Mix component. However, the additional component does not have to be under as high a pressure as the reactive components.
- the discharge direction with respect to which the inoculation bore and the addition devices for the reactive components are at the same height in the mixing chamber is preferably predetermined by the direction of movement of a control piston which can be moved in the mixing chamber and which also serves to eject the mixture from the mixing chamber.
- the feed devices for the additional components have nozzle devices at their outlet opening, which are used for the exact metering of the additional components via the inoculation bore into the mixing chamber.
- the supply devices for the additional components are connected to reservoirs in which these additional components ten stored, if necessary tempered and circulated to bring them into an optimal processing state.
- a vacuum device is additionally provided, which can be connected to the movable connecting unit for cleaning the inoculation bore.
- This vacuum device is connected between two shots, to which various additional components have been added, to the inoculation bore, whereby any residues of the previously dispensed additional component are removed from the inoculation bore. This ensures that the quality of the mixture in the subsequent shot, in which another additional component is used, is not reduced.
- the movable connecting unit can be designed such that it can be moved linearly with respect to the mixing chamber, but there are also embodiments in which it can be rotated with respect to the mixing chamber or else it can be both rotated and moved linearly.
- the movable connection unit is designed as a slide in which the outlet openings of the feed devices, which can be connected to the inoculation bore, are arranged one behind the other with respect to a direction of movement of the slide.
- the carriage can be moved essentially tangentially to the mixing chamber, the inoculation hole essentially forming the point of contact of the tangent.
- the angle enclosed by the direction of movement and an axis of the mixing chamber can be adapted to the structural limits.
- the linear movement of the carriage allows any supply device for additional components to be connected to the inoculation bore, and this component is mixed with the two reactive components on the next shot.
- the movement can be controlled from the outside, so that the additional component can be changed from shot to shot.
- the slide particularly preferably has at least one further hole which can be brought into register with the inoculation bore and which can be connected to a vacuum device around the inoculation bore to clean.
- This at least one bore is advantageously located between two outlet openings for additional components, since in this way a cleaning process of the inoculation bore can be carried out optimally between shots with various additional components.
- a vacuum bore is preferably provided between two outlet openings for additional components.
- the movable connecting unit is essentially piston-shaped or has at least one piston-shaped front area.
- the front area is understood to mean an area of the movable connecting unit which essentially adjoins the mixing chamber or the inoculation bore.
- the longitudinal axis of this piston-shaped region is particularly preferably in a plane perpendicular to the discharge direction of the mixing chamber.
- the longitudinal axis of the piston-shaped region is parallel but not coaxial to a central axis of the inoculation bore.
- the outlet openings of the feed devices for the additional components are provided in an end face of the piston-shaped region.
- the end face covers the inoculation bore, and the outlet openings can be brought into congruence with the inoculation bore by rotating the movable connecting unit, and thus also the piston-shaped area.
- the feed devices for the additional components in the piston-shaped region comprise axially parallel feed bores, while connections to the reservoirs for the additional components are provided on a side of the movable connecting unit opposite the outlet openings and thus the end face.
- connections can form an angle with the axis of the piston-shaped area and can be supplied, for example, via flexible hoses.
- the movable connection unit is designed essentially in the manner of a turret switch; the rotary movement can be used to switch between the feed devices for different additional components.
- the number of different additional components is only limited by the size of the end face of the movable connection unit.
- the movable connecting unit comprises a piston-shaped area which is designed to be movable and / or rotatable essentially tangentially to the mixing chamber, the inoculation bore essentially forming the point of contact of the tangent.
- Outlet openings of the feed devices are arranged in a plane perpendicular to the axis of the piston-shaped area and are oriented essentially radially. They are supplied by axially parallel feed bores which are provided in the piston-shaped area and which in turn are preferably supplied by connections which are provided in the area of the lateral surface of the piston-shaped area. These connections can be connected to reservoirs for the additional components by axial movement of the piston-shaped area, and axially offset from one another.
- connection areas are preferably sealed off from one another so that no carryover of additional components such as paint residues can occur.
- Grooves glued with sealing compound are advantageously used for this purpose, which are provided outside the piston-shaped region or offset axially to the respective connections.
- the piston-shaped area is positioned by rotary movements in such a way that the outlet opening for the desired additional component is congruent with the inoculation bore, a pure rotary movement being sufficient for the change between different additional components.
- This ensures that there is a connection between the reservoir for the additional component and the outlet opening, which is in register with the inoculation bore.
- a bypass provided in the region of the reservoir can be closed, so that the additional component enters the mixing chamber at the same time as the other components. This bypass opens again at the end of the shot.
- the piston-shaped area can be moved in the axial direction with respect to the inoculation bore such that the outlet opening for the desired additional component and the inoculation bore are currently not in register, but there is already a connection between the feed device and the reservoir and is pressurized, i.e. the bypass is closed.
- the piston-shaped area is moved axially in such a way that the outlet opening for the additional component comes to coincide with the inoculation bore and this can also be introduced into the mixing chamber ,
- At least one bore is provided at a distance from the outlet openings for the additional components in the piston-shaped region, which can be connected to the inoculation bore and to a vacuum device, so that the inoculation bore by changing the connection between the additional components a vacuum of any residues of the previous component can be cleaned.
- This at least one bore is preferably axially spaced from the outlet openings, but it is also conceivable that it is provided in areas between the outlet openings.
- the movable connecting unit can be heatable, regardless of its special design, since the viscosity of the additional components can be positively influenced in this way.
- the movable connecting unit in such a way that it can be pressed against the inoculation bore.
- the movable connecting unit can be pressed against the inoculation bore so that there is no risk of the additional component possibly leaking into areas around the inoculation bore.
- a high pressure is applied to seal the inoculation hole.
- This contact pressure is preferably applied via hydraulic or electromagnetic means.
- Electrical or hydraulic means are preferably provided for the movement of the movable connecting unit relative to the mixing chamber.
- the additional components that are added to the reactive components are often different colors.
- Plastic material of different colors can be dispensed with a single mixing head without major conversion work, which can be advantageous, for example, when producing a multi-colored or multi-layer part in different colors or differently colored parts of the same type in succession.
- additional components such as flame retardants or activators and catalysts for the reactive components.
- the reservoirs for the additional components particularly preferably have a circulation system which has a bypass circuit, so that the additional components can either be fed into the feed devices or circulate past them.
- a circulation system which has a bypass circuit, so that the additional components can either be fed into the feed devices or circulate past them.
- 1 an embodiment of a mixing head according to the invention in longitudinal section
- 2 a movable connecting unit in the form of a carriage for use in a mixing head according to the invention
- FIG. 4 an embodiment of an outlet opening of a feed device
- FIG. 5 a further embodiment of a movable connecting unit for
- the mixing head 1 shows a circuit groove mixing head 1 with calming pins 12 as an example of an embodiment of a mixing head in which the present invention can be used.
- the mixing head 1 comprises a mixing chamber 2, in which a control piston 4 is mounted so as to be axially movable.
- These addition devices 6 are preferably located at the same height in relation to an outlet or ejection direction of the mixing chamber, which is predetermined by the movement of the control piston and runs downwards in the present figure.
- an inoculation bore 10 through which additional components can be fed into the mixing chamber 2.
- each addition device 6 for reactive components is covered by a respective circulation groove 5 and the reactive components each freely circulate between the inlet 7 and an outlet 8, which leads back to a reservoir for the respective component.
- the control piston 4 Only when the mixed Chamber 2 is to be filled, the control piston 4 is moved upward, the addition device 6 thereby opened relative to the mixing chamber 2, and an injection process into the mixing chamber 2 with mixing of the components there takes place. Since the reactive components are under pressure and are preferably essentially injected into one another into the mixing chamber 2, good mixing of the components is ensured.
- settling pins 12 which are offset by 90 ° to the outlet direction, which are controlled by a logic and are inserted into the outlet system immediately after release by the control piston 4. They ensure the desired mixing chamber limitation and calm the escaping reaction mixture. Due to the inoculation bore 10 provided in addition to the addition devices 6, an additional component can be fed into the mixing chamber 2 at the same time as the reactive components. No circulation groove is provided in the control piston 4 for this additional component, as a result of which carryover of the additional component can be largely avoided.
- FIG. 2 shows a carriage 14 as it can be used according to the invention as a movable connecting device for supplying different additional components to an inoculation bore 10.
- This carriage is attached to a mixing chamber 2 according to FIG. 1 in such a way that it can be moved tangentially to the mixing chamber 2 in such a way that feed devices 16, which are shown in section in FIG. 2, are provided with nozzle openings 18 with the inoculation bore provided at their outlet openings 10 can be brought to cover.
- the slide 14 has a sliding surface 24 in the region of the nozzle devices 18, which enables the slide 14 to be moved as resistance-free as possible along the direction specified by the arrow 15.
- pressure surfaces 22 are provided, onto which a pressure can be exerted via a feed device 16 through the inoculation bore 10 into the mixing chamber 2 during the feeding process of an additional component, so as to ensure the tightest possible connection between the slide 14 and inoculation bore 10 or that to the sliding surface 24 to ensure the corresponding area.
- an outlet opening 20 of a vacuum channel 21 is shown between two nozzle devices 18, which can be brought into coincidence with the inoculation bore 10 between two different feeding processes of different additional components into the mixing chamber 2. Via the vacuum channel 21, a connection with a Not. Vacuum device shown in detail, whereby any residues of the preceding additional component remaining in the inoculation bore 10 are sucked off.
- the control piston 4 is in a closed or circulating position, ie it covers the inoculation bore 10 and the addition devices 6 and the reactive components can circulate via the circulation grooves 5.
- FIG. 3 shows a section through the carriage 14 according to FIG. 2 along the section line A-A. From this it can be seen that the outlet opening 20 of the vacuum channel 21 essentially has the diameter of the inoculation bore 10, while the vacuum channel 21 is guided along the entire slide 14 past the feed devices 16, for example also a plurality of outlet openings between different nozzle devices 18 of feed devices 16 are provided to be able to supply.
- An outlet opening 20 of the vacuum channel 21 is preferably provided in a carriage 14 according to FIG. 2 between each pair of feed devices 16, as a result of which the cleaning step can be carried out even more easily.
- the length of the slide 14 is only limited by the size of the mixing head 1, and is otherwise determined by the number of additional components to be supplied alternately.
- connection of the respective feed device 16 to a reservoir for the additional component is not shown in detail, but there are various connection forms between relatively moving elements known from the prior art.
- FIG. 4 shows an embodiment of a nozzle device 18, a sealing device 26, for example in the form of an O-ring, being provided in a groove at the outlet opening of the feed device 16, in front of which a nozzle plate 19 is arranged, which is adapted to the properties of the each additional component supplied is adapted in terms of shape and diameter.
- a sealing device 26 for example in the form of an O-ring, being provided in a groove at the outlet opening of the feed device 16, in front of which a nozzle plate 19 is arranged, which is adapted to the properties of the each additional component supplied is adapted in terms of shape and diameter.
- FIG. 5 shows a further advantageous embodiment of a movable connection unit according to the present invention.
- This is a kind of revolver switch, d. H.
- the movable connecting unit 28 has, at least in a front, piston-shaped region 30, rotational symmetry with respect to a longitudinal axis.
- This piston-shaped area 30 has an end face 32 into which outlet openings 34 of the feed devices 36 open.
- These outlet openings 34 can again take the form of a nozzle device and, for example, can also be designed according to FIG. 4.
- the feed devices 36 in the piston-shaped area 30 comprise feed bores 38 which are parallel to the axis and which are connected at their rear ends via connections 40 to reservoirs for the additional components.
- connections are not shown in detail and can be made, for example, via flexible hose connections.
- a contact surface 42 is also provided, to which a pressure can be exerted, through which the outlet openings 34 in the end face 32 of the piston-shaped region 30 are pressed against the inoculation bore 10, and so on to establish a sealing connection.
- FIG. 6 shows a section through a mixing head according to the invention perpendicular to the discharge direction of the mixing chamber 2, in which a movable connecting unit 28 according to FIG. 5 is used.
- a movable connecting unit 28 according to FIG. 5 is used.
- two addition devices 6 which open in one plane and essentially oriented towards each other in the mixing chamber 2, in which the control piston 4 is in the circulation position, that is, the outlet openings of the addition devices 6 are via the circulation grooves 5 with reservoirs not shown for the reactive components connected.
- the functioning of such addition devices is known from the prior art.
- a fitting bore 48 ends, the longitudinal axis of which is parallel but not coaxial to the longitudinal axis of the injecting bore 10, and into which the movable connecting unit 28 can be inserted precisely.
- the movable connection unit 28 can additionally be sealed against the end face of the fitting bore 48 by applying pressure in a pressure space 44, which acts on the contact surface 42 of the connection unit already described.
- these grooves 5 and the area of the inoculation bore 10 can additionally be sealed off from one another by seals 46.
- FIG. 7 shows a further possible embodiment of a movable connecting unit in the form of a so-called feed piston 50 with feed devices 56 and a mixing chamber 2 with control piston 4, which is only shown schematically, in section.
- the control piston 4 in the mixing chamber 2 is in the circulation position.
- the feed piston 50 is essentially piston-shaped and is axially and rotationally movably mounted in a piston chamber 51, as indicated by the arrows on the right side.
- there is a vacuum bore 52 which penetrates the feed piston 50 and coincides with the inoculation bore 10 and in connection with a vacuum device 54, which is shown only schematically here.
- a further vacuum bore can be provided, which runs exactly at right angles to the vacuum bore shown here.
- a feed device 56 essentially comprises an atomization bore 64, an axial feed bore 62 and an inlet bore 60 as the outlet opening.
- the feed ports 59 are arranged in the wall of the piston chamber 51 and preferably in a ring around the feed piston 50 and are not in closer connection with circulation systems 58 shown for the respective additional components.
- seals 66 are attached around the piston. brought, which prevent a discharge of the additional components outside the areas assigned to them as possible and thus avoid mixing of the additional components.
- Grooves glued with sealing compound, as are known from the control piston of a mixing head, can be provided as seals 66.
- a heating cartridge 70 is additionally provided along the axis of the feed piston 50.
- the feed plunger 50 shown here is designed for the alternate feed of four different additional components.
- the axial feed bores 62 which connect the circulation systems 58 for the additional components to the atomization bores 64, have different diameters, depending on the length of the respective axial feed bore 62 and the associated pressure loss occurring therein as well as the properties of the additional component , such as their viscosity.
- the diameter of the atomization bores 64 can also be adapted to the component to be dispensed. Furthermore, it is also possible to provide 64 special nozzle devices instead of the simple atomization bores.
- FIG. 9 shows the feed piston 50 according to FIG. 7 in the development.
- Two vacuum bores 52 are placed at right angles to one another through the axis of the piston 50.
- the atomization bores 64 and the respectively associated inlet bores 60 each have some space between the surface of the feed plunger 50 and the piston chamber 51 in a small area around the bore, the feed plunger here, for example, is ground, while the areas that extend along the circumference between the are located individual bores and are shown hatched, preferably as precisely as possible, ie sealing against the wall of the piston chamber 51 or coated with sealing compound.
- a next step by rotating the feed piston 50, the atomization bore 64 belonging to the desired additional component is positioned such that it only has an axial offset to the inoculation bore 10.
- the feed plunger 50 is shifted to the left so that the atomization bore 64 is located above the inoculation bore and at the same time a connection between the inlet bore 60 and the corresponding circulation system 58 is established via the associated feed connection 59.
- a bypass of the circulation system 58 which is only shown schematically, is now closed in relation to the opening of the control piston 4 of the mixing head 1 such that the additional component enters the mixing chamber at the same time as the reactive components, since the bypass closes the atomization bore 64 builds up pressure.
- the pressure at which the additional component is introduced into the mixing chamber 2 is below that of the reactive components, the pressure for the reactive components is, for example, in the range from 150-200 bar, while the additional components are usually at a pressure in the range of 80-150 bar.
- the high-pressure feed of the reactive components causes such a vortex flow in the mixing chamber that the components fed in under a lower pressure are also mixed well.
- control piston 4 closes under timer control and the bypass opens again, so that the additional component circulates freely again in the circulation system 58.
- the feed plunger 50 is moved to the right again, so that the inoculation bore 10 and a vacuum bore 52 coincide, and the inoculation bore 10 can be cleaned by means of an applied vacuum.
- the next mixing process takes place analogously, with another additional component being able to be brought into the injection position on the inoculation bore 10. If the same component is to be added in successive mixing operations, the cleaning step can also be dispensed with.
- the atomization bore 64 then remains in position behind the injection bore 10 and only the bypass is closed at the same time as the control piston 4 is closed.
- the inoculation bore 10 of the feed plunger 50 is cleaned by means of vacuum, then the atomization bore 64 of the desired additional component is brought into the correct circumferential position by rotating the feed plunger 50, although there is still an axial offset to the inoculation bore 10 and the bypass of the associated circulation system 58 is closed. This already creates a pressure at the supply connection 59.
- the feed piston 50 is actuated such that it moves into the front position shortly before or simultaneously with the opening of the control piston 4, in which the atomization bore 64 is in register with the injection bore 10.
- the control piston 4 of the mixing head opens, the additional component can enter the mixing chamber 2 under pressure.
- the control piston 4 closes and the feed piston 50 retracts, the bypass of the circulation system 58 opens and the inoculation bore 10 is cleaned by means of vacuum.
- the exact position of the feed piston 50 can optionally be determined by additionally provided position sensors 68.
- the number of possible additional components is only limited by the size or the diameter of the feed piston 50 or by the overall size of the mixing head 2, on which the feed piston 50 has to be accommodated.
- the control of the other embodiments 14, 28 of a mixing head according to the invention takes place analogously to that described here for the case of a feed piston 50.
- a mixing head according to the invention can thus be seen in the fact that, regardless of the actual mixing chamber size, any number of additional components can be added to the reactive mixture and a change between the different additional components can take place automatically from shot to shot. Only a minimal carryover of the respective additional components occurs here.
- cleaning measures can be provided using a vacuum device.
- Such a design of the mixing head makes reaction casting by far more flexible because it allows reactive mixtures with different properties, for example with different colors, to be discharged directly in succession with a single mixing head. This is advantageous, for example, when larger parts such as cast skins for automotive interior parts are to be manufactured from different components in one work step.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04715827A EP1613464A1 (de) | 2003-03-28 | 2004-02-28 | Mischkopf f r eine reaktionsgiessmaschine |
CA002519924A CA2519924A1 (en) | 2003-03-28 | 2004-02-28 | Mixing head for a reaction casting machine |
US11/235,526 US20060050607A1 (en) | 2003-03-28 | 2005-09-26 | Mixing head for a reaction injection molding machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10314117.0 | 2003-03-28 | ||
DE10314117A DE10314117B3 (de) | 2003-03-28 | 2003-03-28 | Mischkopf für eine Reaktionsgießmaschine |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/235,526 Continuation US20060050607A1 (en) | 2003-03-28 | 2005-09-26 | Mixing head for a reaction injection molding machine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004085138A1 true WO2004085138A1 (de) | 2004-10-07 |
Family
ID=32603247
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/002003 WO2004085138A1 (de) | 2003-03-28 | 2004-02-28 | Mischkopf für eine reaktionsgiessmaschine |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060050607A1 (de) |
EP (1) | EP1613464A1 (de) |
CN (1) | CN1795089A (de) |
CA (1) | CA2519924A1 (de) |
DE (1) | DE10314117B3 (de) |
WO (1) | WO2004085138A1 (de) |
Citations (10)
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EP0344898A1 (de) * | 1988-04-18 | 1989-12-06 | Minnesota Mining And Manufacturing Company | Mischvorrichtung für eine Herstellungsmaschine von Formteilen aus Reaktionskunststoffen |
DE4124599C1 (de) * | 1991-07-25 | 1992-11-05 | Kloeckner Ferromatik Desma Gmbh, 7831 Malterdingen, De | |
EP0594981A1 (de) * | 1992-10-30 | 1994-05-04 | Toyoda Gosei Co., Ltd. | RIM-Verfahren zur Herstellung von Formteilen aus Polyurethanschaumstoff mit gefärbter Haut |
EP0674950A1 (de) * | 1994-03-31 | 1995-10-04 | PIRELLI GENERAL plc | Ventilvorrichtung und diese Vorrichtung aufweisender Apparat zur Harzbeschichtung |
JPH115714A (ja) * | 1997-02-03 | 1999-01-12 | L'oreal Sa | 耐移り性メークアップ組成物及びその製法 |
WO1999052699A1 (en) * | 1998-04-08 | 1999-10-21 | Johnson Control S.P.A. | Injector for co-injection |
JP2001300280A (ja) * | 2000-04-25 | 2001-10-30 | Pauretsuku:Kk | 撹拌機 |
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US3026183A (en) * | 1960-02-05 | 1962-03-20 | Dayco Corp | Mixing apparatus |
US3215406A (en) * | 1961-05-18 | 1965-11-02 | Phillips Petroleum Co | Apparatus and method for blending plastics |
US3220801A (en) * | 1962-05-31 | 1965-11-30 | Gen Motors Corp | Froth generator |
DE2118822C3 (de) * | 1971-04-19 | 1980-01-31 | Hans-Erich 7595 Sasbachwalden Gubela | Verfahren zur Herstellung von reflektierenden Kennzeichnungsschildern |
DE4140787C1 (en) * | 1991-12-11 | 1993-03-18 | Kloeckner Ferromatik Desma Gmbh, 7831 Malterdingen, De | Valve control mechanism contg. angularly displaced valves - can supply different plastics and colour components to mixing chamber of mixing head |
US6247839B1 (en) * | 1999-06-17 | 2001-06-19 | Milliken & Company | Valve disposition and configuration designed to improve color dosing response time in a process of coloring polyurethane foam carpet underlay |
-
2003
- 2003-03-28 DE DE10314117A patent/DE10314117B3/de not_active Expired - Fee Related
-
2004
- 2004-02-28 CN CN200480005594.XA patent/CN1795089A/zh active Pending
- 2004-02-28 EP EP04715827A patent/EP1613464A1/de not_active Withdrawn
- 2004-02-28 WO PCT/EP2004/002003 patent/WO2004085138A1/de active Application Filing
- 2004-02-28 CA CA002519924A patent/CA2519924A1/en not_active Abandoned
-
2005
- 2005-09-26 US US11/235,526 patent/US20060050607A1/en not_active Abandoned
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GB1448395A (en) * | 1973-03-12 | 1976-09-08 | Oceanetics Inc | Sampling system and selector valve therefor |
DE3427327A1 (de) * | 1983-07-27 | 1985-02-07 | Elastogran Maschinenbau GmbH, 2844 Lemförde | Mischkopf zum erzeugen eines vorzugsweise chemisch reaktionsfaehigen gemisches aus mindestens zwei kunststoffkomponenten |
JPS63267527A (ja) * | 1987-04-27 | 1988-11-04 | Mazda Motor Corp | 反応射出成形装置 |
EP0344898A1 (de) * | 1988-04-18 | 1989-12-06 | Minnesota Mining And Manufacturing Company | Mischvorrichtung für eine Herstellungsmaschine von Formteilen aus Reaktionskunststoffen |
DE4124599C1 (de) * | 1991-07-25 | 1992-11-05 | Kloeckner Ferromatik Desma Gmbh, 7831 Malterdingen, De | |
EP0594981A1 (de) * | 1992-10-30 | 1994-05-04 | Toyoda Gosei Co., Ltd. | RIM-Verfahren zur Herstellung von Formteilen aus Polyurethanschaumstoff mit gefärbter Haut |
EP0674950A1 (de) * | 1994-03-31 | 1995-10-04 | PIRELLI GENERAL plc | Ventilvorrichtung und diese Vorrichtung aufweisender Apparat zur Harzbeschichtung |
JPH115714A (ja) * | 1997-02-03 | 1999-01-12 | L'oreal Sa | 耐移り性メークアップ組成物及びその製法 |
WO1999052699A1 (en) * | 1998-04-08 | 1999-10-21 | Johnson Control S.P.A. | Injector for co-injection |
JP2001300280A (ja) * | 2000-04-25 | 2001-10-30 | Pauretsuku:Kk | 撹拌機 |
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PATENT ABSTRACTS OF JAPAN vol. 0133, no. 20 (M - 853) 20 July 1989 (1989-07-20) * |
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 02 2 April 2002 (2002-04-02) * |
Also Published As
Publication number | Publication date |
---|---|
CN1795089A (zh) | 2006-06-28 |
EP1613464A1 (de) | 2006-01-11 |
US20060050607A1 (en) | 2006-03-09 |
CA2519924A1 (en) | 2004-10-07 |
DE10314117B3 (de) | 2004-07-29 |
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