CA2706985A1 - Piston injection unit for an injection molding machine - Google Patents
Piston injection unit for an injection molding machine Download PDFInfo
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- CA2706985A1 CA2706985A1 CA2706985A CA2706985A CA2706985A1 CA 2706985 A1 CA2706985 A1 CA 2706985A1 CA 2706985 A CA2706985 A CA 2706985A CA 2706985 A CA2706985 A CA 2706985A CA 2706985 A1 CA2706985 A1 CA 2706985A1
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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
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
- B29C45/544—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw the plasticising unit being connected to a transfer chamber in the injection unit at the upstream side of the injection piston
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The present invention relates to a piston injection unit for an injection molding machine with a cylinder (11), a piston (9) guided movably therein and a nozzle unit (4), which is disposed at one end of the cylinder. Flowable material can be pressed through the nozzle unit (4) by means of the piston. A supply opening (21) is provided in the cylinder wall in a region, which, in every position of the piston (9) during the operation, is on the side of the end of the piston, assigned to the nozzle unit, facing away from the nozzle unit, so that the flowable material can be introduced into the cylinder (11) transversely to the longitudinal axis of the piston or the cylinder. The piston (9) has at least one first sealing area (23) at the end of the piston assigned to the nozzle unit.
The sealing area has an external surface of the piston and an internal surface of the cylinder, which seal by mutual flat contact. In the area between the supply opening and the first sealing region, a flow channel (15, 17, 18, 24) for the flowable material is provided and, in the piston end facing the nozzle unit, discharges at a distance from the outer surface of the piston and/or a scraper part (8) for a flat contact with the outer wall of the piston is provided at the cylinder (11). A scraper surface, extending transversely to the longitudinal axis of the piston or the cylinder and surrounding the piston (9), is formed in a plane, which is provided at an angle to the longitudinal axis of the piston.
The sealing area has an external surface of the piston and an internal surface of the cylinder, which seal by mutual flat contact. In the area between the supply opening and the first sealing region, a flow channel (15, 17, 18, 24) for the flowable material is provided and, in the piston end facing the nozzle unit, discharges at a distance from the outer surface of the piston and/or a scraper part (8) for a flat contact with the outer wall of the piston is provided at the cylinder (11). A scraper surface, extending transversely to the longitudinal axis of the piston or the cylinder and surrounding the piston (9), is formed in a plane, which is provided at an angle to the longitudinal axis of the piston.
Description
P2171 DEOO Zhafir Plastics Machinery PISTON INJECTION UNIT FOR AN INJECTION MOLDING MACHINE
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to a piston-injection unit for an injection moulding machine in accordance with the generic term of claim 1.
PRIOR ART
Injection moulding machines are widely used in industry to make all kinds of different objects. Although a plurality of moulding machines is accordingly in use and make it possible to manufacture a plurality of products of the highest quality, there is still a need to improve the injection moulding technology.
One problem, for example, concerns the seal between the piston outer wall and the cylinder inner wall in a piston-injection unit. In a corresponding piston-injection unit, the material to be injected is pressed in a flowable state by a piston, which is guided in a cylinder, through a nozzle unit arranged at one end of the cylinder. On account of the corresponding pressure, it can happen that flowable material passes into the area between the piston outer wall and the cylinder inner wall. If the material remains there for too long, it can cure or react with other substances, thus creating undesirable foreign particles, which may on one hand increase the friction and wear between the piston and cylinder and, on the other, may contaminate the product to be made if it flows back into the moulding compound. Moreover, one problem is that the piston movement causes this excess material to escape uncontrollably at the end of the cylinder opposite the nozzle unit and thus also leads to contamination.
DE 697 06 167 T2 or the corresponding EP 0 906 180 B1 proposes an injection apparatus, which provides for a certain amount of clearance between the outer wall of the piston and the inner wall of the cylinder. The clearance is specifically matched to the viscosity of the material to be injected in order that rapid exchange of the material in the clearance may occur P2171 DE00 Zhafir Plastics Machinery and thus the above-mentioned particle formation avoided. In addition, an annular groove is provided on the piston to prevent aspiration of air into the inner area of the cylinder.
However, such an apparatus has further problems arising from its structural design. Thus, in this piston-injection unit, the material to be injected is introduced into the cylinder from the side, whereby the front part of the piston, which is facing the nozzle unit, has a smaller diameter, thus forming an annular gap through which the flowable material can pass into the space between the nozzle and piston prior to the actual injection process.
During the injection process in which the piston is moved towards the nozzle to force the material in the space through the nozzle, the annular gap is sealed by a separate sealing element, which is located inside the space in front of the piston. However, the separate design of the sealing element (nonreturn valve) and the correspondingly small dimensions, combined with the prevailing injection pressure, creates the problem that the seal between the space and the piston or the inner wall of the cylinder is unsatisfactory. In addition, the annular gap between the front piston skirt and cylinder inner wall creates a large volume in which the plasticised material dwells for a protracted period, with no guarantee of complete, rapid exchange through entrainment towards the injection mould.
The piston-injection unit of DE 697 06 167 T2 further comprises a cutting element at the end of the cylinder or piston opposite the nozzle unit, said cutting element cutting off the excess moulding material which adheres to the outer wall of the piston and thus ends up in the rear side of the piston that is facing away from the nozzle unit. To this end, the cutting element has a cutting surface in the shape of a truncated cone. While this cutting element works satisfactorily for solid, already cured particles, adequate cleaning of the piston is not guaranteed in the case of material which is still partially flowable.
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to a piston-injection unit for an injection moulding machine in accordance with the generic term of claim 1.
PRIOR ART
Injection moulding machines are widely used in industry to make all kinds of different objects. Although a plurality of moulding machines is accordingly in use and make it possible to manufacture a plurality of products of the highest quality, there is still a need to improve the injection moulding technology.
One problem, for example, concerns the seal between the piston outer wall and the cylinder inner wall in a piston-injection unit. In a corresponding piston-injection unit, the material to be injected is pressed in a flowable state by a piston, which is guided in a cylinder, through a nozzle unit arranged at one end of the cylinder. On account of the corresponding pressure, it can happen that flowable material passes into the area between the piston outer wall and the cylinder inner wall. If the material remains there for too long, it can cure or react with other substances, thus creating undesirable foreign particles, which may on one hand increase the friction and wear between the piston and cylinder and, on the other, may contaminate the product to be made if it flows back into the moulding compound. Moreover, one problem is that the piston movement causes this excess material to escape uncontrollably at the end of the cylinder opposite the nozzle unit and thus also leads to contamination.
DE 697 06 167 T2 or the corresponding EP 0 906 180 B1 proposes an injection apparatus, which provides for a certain amount of clearance between the outer wall of the piston and the inner wall of the cylinder. The clearance is specifically matched to the viscosity of the material to be injected in order that rapid exchange of the material in the clearance may occur P2171 DE00 Zhafir Plastics Machinery and thus the above-mentioned particle formation avoided. In addition, an annular groove is provided on the piston to prevent aspiration of air into the inner area of the cylinder.
However, such an apparatus has further problems arising from its structural design. Thus, in this piston-injection unit, the material to be injected is introduced into the cylinder from the side, whereby the front part of the piston, which is facing the nozzle unit, has a smaller diameter, thus forming an annular gap through which the flowable material can pass into the space between the nozzle and piston prior to the actual injection process.
During the injection process in which the piston is moved towards the nozzle to force the material in the space through the nozzle, the annular gap is sealed by a separate sealing element, which is located inside the space in front of the piston. However, the separate design of the sealing element (nonreturn valve) and the correspondingly small dimensions, combined with the prevailing injection pressure, creates the problem that the seal between the space and the piston or the inner wall of the cylinder is unsatisfactory. In addition, the annular gap between the front piston skirt and cylinder inner wall creates a large volume in which the plasticised material dwells for a protracted period, with no guarantee of complete, rapid exchange through entrainment towards the injection mould.
The piston-injection unit of DE 697 06 167 T2 further comprises a cutting element at the end of the cylinder or piston opposite the nozzle unit, said cutting element cutting off the excess moulding material which adheres to the outer wall of the piston and thus ends up in the rear side of the piston that is facing away from the nozzle unit. To this end, the cutting element has a cutting surface in the shape of a truncated cone. While this cutting element works satisfactorily for solid, already cured particles, adequate cleaning of the piston is not guaranteed in the case of material which is still partially flowable.
2 3 The same applies to an ejection guide, which is described in DE 699 21 059 T2 and the corresponding EP 0992333 B1. Here, for the purpose of removing corresponding excess material, an additional band heater is needed to ensure that the material has adequate flow properties.
DISCLOSURE OF THE INVENTION
OBJECT OF THE INVENTION
P2171 DE00 Zhafir Plastics Machinery It is therefore an object of the present invention to provide a piston-injection unit for an injection moulding machine that easily and effectively solves the problem of handling excess material that can pass into the space between piston and cylinder inner wall, whereby the piston-injection unit, moreover, has well-balanced properties with respect to the attainable injection results. In particular, the piston-injection unit shall have a simple and effective design and be easy to use and feature simple and suitable material supply.
TECHNICAL SOLUTION
This object is achieved with a piston-injection unit having the characteristics of claims 1, 3, 18, 20 and 29. Advantageous embodiments are the object of the dependent claims.
The present invention relates to a piston-injection unit comprising a cylinder, a piston movably guided therein and a nozzle unit arranged at one end of the cylinder.
Furthermore, in the inventive piston-injection unit, the material to be injected is introduced laterally into the cylinder in the vicinity of the piston skirt. From a first aspect of the invention, the invention is characterised in that, at the front end of the piston, which is facing the nozzle unit, at least a first sealing area is provided, which has an outer surface of the piston and an inner surface of the cylinder, which abut each other such that they seal off this area as far as possible. Despite the lateral material supply in the vicinity of the piston skirt, said lateral supply possessing advantages in the field of machine design and the piston guide, it is advantageous for the front end of the piston, which comes into direct contact with the material being injected, to be already provided with a first sealing area in order that penetration of material into the area between the piston and cylinder inner wall may be avoided.
In accordance with the design comprising lateral material supply into the cylinder, the invention provides for a flow channel for the flowable material, which guides the flowable material supplied from the side of the piston to an outlet or a mouth at the end of the piston, whereby the mouth or the outlet can be spaced apart from the outer surface of the piston, since the outer surface constitutes the first sealing area. With such a design, it is possible through the first sealing area to isolate the space in front of the piston in which the flowable material is
DISCLOSURE OF THE INVENTION
OBJECT OF THE INVENTION
P2171 DE00 Zhafir Plastics Machinery It is therefore an object of the present invention to provide a piston-injection unit for an injection moulding machine that easily and effectively solves the problem of handling excess material that can pass into the space between piston and cylinder inner wall, whereby the piston-injection unit, moreover, has well-balanced properties with respect to the attainable injection results. In particular, the piston-injection unit shall have a simple and effective design and be easy to use and feature simple and suitable material supply.
TECHNICAL SOLUTION
This object is achieved with a piston-injection unit having the characteristics of claims 1, 3, 18, 20 and 29. Advantageous embodiments are the object of the dependent claims.
The present invention relates to a piston-injection unit comprising a cylinder, a piston movably guided therein and a nozzle unit arranged at one end of the cylinder.
Furthermore, in the inventive piston-injection unit, the material to be injected is introduced laterally into the cylinder in the vicinity of the piston skirt. From a first aspect of the invention, the invention is characterised in that, at the front end of the piston, which is facing the nozzle unit, at least a first sealing area is provided, which has an outer surface of the piston and an inner surface of the cylinder, which abut each other such that they seal off this area as far as possible. Despite the lateral material supply in the vicinity of the piston skirt, said lateral supply possessing advantages in the field of machine design and the piston guide, it is advantageous for the front end of the piston, which comes into direct contact with the material being injected, to be already provided with a first sealing area in order that penetration of material into the area between the piston and cylinder inner wall may be avoided.
In accordance with the design comprising lateral material supply into the cylinder, the invention provides for a flow channel for the flowable material, which guides the flowable material supplied from the side of the piston to an outlet or a mouth at the end of the piston, whereby the mouth or the outlet can be spaced apart from the outer surface of the piston, since the outer surface constitutes the first sealing area. With such a design, it is possible through the first sealing area to isolate the space in front of the piston in which the flowable material is
3 P2171 DEN Zhafir Plastics Machinery under the corresponding injection pressure from the supply region for the flowable material, i.e. the flow channel.
From a second aspect of the present invention for which protection is sought independently and in combination with the other aspects of the invention, the flow channel is designed such that the flow channel is fully flushed by subsequent flow material as material is transported from the supply opening to the space in front of the piston, such that the dwell time of the material to be injected in the flow channel can be kept short. This prevents unwanted and adverse material reactions in the flow channel. By complete flushing here is meant especially that no dead spaces exist in which material escapes being entrained by subsequent material.
Complete does not mean, however, that the flow front is always straight and stable. Rather, differential flow rates and mixing of material in the flow channel can obtain.
Furthermore, at least one second sealing area can be provided which guarantees an additional seal between the piston and cylinder inner wall with respect to the rear side of the piston 1 '5 facing away from the nozzle unit, and in particular seals against at least parts of the flow channel, i.e. the supply region for the flowable material.
Accordingly, the flow channel can be provided at least partially between the first and the second sealing area.
The mouth of the flow channel can be provided at the end face of the piston facing the nozzle unit in a central region close to the longitudinal axis of the piston and in particular concentrically to the piston's longitudinal axis. This ensures that the end of the piston adjacent to the space in front of it is of a structurally favourable design and has the appropriate strength and leak-proofness. For uniform distribution of the flowable material, the mouth of the flow channel can have several openings or be shaped like a star or cloverleaf.
To prevent backflow of the flowable material transported into the space in front of the piston during the injection process, a check valve can be provided in the flow channel to seal off the flow channel, i.e. the supply region.
From a second aspect of the present invention for which protection is sought independently and in combination with the other aspects of the invention, the flow channel is designed such that the flow channel is fully flushed by subsequent flow material as material is transported from the supply opening to the space in front of the piston, such that the dwell time of the material to be injected in the flow channel can be kept short. This prevents unwanted and adverse material reactions in the flow channel. By complete flushing here is meant especially that no dead spaces exist in which material escapes being entrained by subsequent material.
Complete does not mean, however, that the flow front is always straight and stable. Rather, differential flow rates and mixing of material in the flow channel can obtain.
Furthermore, at least one second sealing area can be provided which guarantees an additional seal between the piston and cylinder inner wall with respect to the rear side of the piston 1 '5 facing away from the nozzle unit, and in particular seals against at least parts of the flow channel, i.e. the supply region for the flowable material.
Accordingly, the flow channel can be provided at least partially between the first and the second sealing area.
The mouth of the flow channel can be provided at the end face of the piston facing the nozzle unit in a central region close to the longitudinal axis of the piston and in particular concentrically to the piston's longitudinal axis. This ensures that the end of the piston adjacent to the space in front of it is of a structurally favourable design and has the appropriate strength and leak-proofness. For uniform distribution of the flowable material, the mouth of the flow channel can have several openings or be shaped like a star or cloverleaf.
To prevent backflow of the flowable material transported into the space in front of the piston during the injection process, a check valve can be provided in the flow channel to seal off the flow channel, i.e. the supply region.
4 P2171 DEOO Zhafir Plastics Machinery The check valve can be provided inside the piston and implemented in particular by a movable sealing body arranged in a distribution chamber of the flow channel near the mouth, said sealing body closing the flow channel mouth under the appropriate pressure buildup.
The flow channel from the supply opening in the cylinder wall to the mouth at the end face of the piston can comprise an axial groove in the piston and an annular groove, which can be provided adjacent to the first sealing area. If arranged immediately adjacent to the sealing area, the annular groove, which cooperates with the axial groove, has the advantage that small amounts of the flowable material which pass through the sealing area are collected in the annular groove and used immediately for the next injection process.
From the annular groove, a radial connecting section can be provided that creates the connection to the mouth. Accordingly, the flowable material flows from the supply opening in the cylinder wall via the axial groove in the piston into an annular groove, from where the material passes via a radial connecting section into the mouth provided centrally or concentrically to the longitudinal axis of the piston. The radial connecting section, which may implemented as a radial bore, is provided preferably opposite the connection of the axial groove and annular groove.
To ensure easy inflow into the axial groove, the supply opening in the cylinder wall can, in accordance with the axial groove in the piston, have an aperture greater in the direction of the longitudinal axis of the piston or the cylinder, than in the transverse direction.
The supply opening elongated in the direction of the longitudinal axis of the piston or cylinder to form a slot also has the effect of expanding the axial adjustability of the piston, which ensures that the flow channel does not form dead spaces for the supplied plasticised material.
This provides greater variability with regard to the end position of the piston, in which complete enforced or self-flushing occurs. Accordingly, from a further aspect of the present invention, protection is sought independently for this and in conjunction with the other aspects.
For the material which nonetheless enters the region between the piston and cylinder inner wall and from there into the rear region, i.e. the region of the cylinder facing away from the nozzle unit, a further aspect of the invention for which protection is also sought independently
The flow channel from the supply opening in the cylinder wall to the mouth at the end face of the piston can comprise an axial groove in the piston and an annular groove, which can be provided adjacent to the first sealing area. If arranged immediately adjacent to the sealing area, the annular groove, which cooperates with the axial groove, has the advantage that small amounts of the flowable material which pass through the sealing area are collected in the annular groove and used immediately for the next injection process.
From the annular groove, a radial connecting section can be provided that creates the connection to the mouth. Accordingly, the flowable material flows from the supply opening in the cylinder wall via the axial groove in the piston into an annular groove, from where the material passes via a radial connecting section into the mouth provided centrally or concentrically to the longitudinal axis of the piston. The radial connecting section, which may implemented as a radial bore, is provided preferably opposite the connection of the axial groove and annular groove.
To ensure easy inflow into the axial groove, the supply opening in the cylinder wall can, in accordance with the axial groove in the piston, have an aperture greater in the direction of the longitudinal axis of the piston or the cylinder, than in the transverse direction.
The supply opening elongated in the direction of the longitudinal axis of the piston or cylinder to form a slot also has the effect of expanding the axial adjustability of the piston, which ensures that the flow channel does not form dead spaces for the supplied plasticised material.
This provides greater variability with regard to the end position of the piston, in which complete enforced or self-flushing occurs. Accordingly, from a further aspect of the present invention, protection is sought independently for this and in conjunction with the other aspects.
For the material which nonetheless enters the region between the piston and cylinder inner wall and from there into the rear region, i.e. the region of the cylinder facing away from the nozzle unit, a further aspect of the invention for which protection is also sought independently
5 P2171 DEOO Zhafir Plastics Machinery and in combination with the other aspects of the invention provides for a scraper part which makes flat contact with the piston outer wall and forms on the end face a scraper surface, which is provided obliquely to the longitudinal axis of the piston. Through the oblique configuration of the scraper surface in a single plane corresponding to the end face, both solid and partially liquid material is transported effectively into a discharge opening in the cylinder wall, without need for provision of additional measures.
The scraper part is preferably formed as a cylindrical sleeve or ring with an end face running obliquely to the longitudinal axis. Preferably, the scraper part is made of metal, especially brass or an alloy thereof .
To facilitate precise adjustment of the scraper part to the piston, the scraper part can be accommodated with compensating clearance in the cylinder. In particular, an annular recess can be provided at the end of the cylinder to accommodate the scraper part, which can be attached in particular to a corresponding retaining part on the cylinder end.
In the inventive piston-injection unit, the plasticising unit, which may be formed for example by a screw extruder, can be arranged laterally offset from the longitudinal axis of the piston or cylinder of the piston-injection unit. Accordingly, the flowable material can be discharged from the plasticising unit at an angle between 0 and 180 to the piston or cylinder longitudinal axis.
Between plasticising unit and supply opening in the cylinder can be provided a baffle, which guides the flowable material from the plasticising unit to the supply opening and especially facilitates supply of the flowable material perpendicularly to the piston or cylinder longitudinal axis.
From another aspect of the present invention, for which again protection is sought independently and in combination with the other aspects of the present invention, plasticising unit and baffle are not permanently connected, but only abut one another to form a butt connection.
The butt connection can for example be a spherical cap connection, which is pressed together by the two abutting parts, i.e. plasticising unit and baffle, and held firmly and/or under
The scraper part is preferably formed as a cylindrical sleeve or ring with an end face running obliquely to the longitudinal axis. Preferably, the scraper part is made of metal, especially brass or an alloy thereof .
To facilitate precise adjustment of the scraper part to the piston, the scraper part can be accommodated with compensating clearance in the cylinder. In particular, an annular recess can be provided at the end of the cylinder to accommodate the scraper part, which can be attached in particular to a corresponding retaining part on the cylinder end.
In the inventive piston-injection unit, the plasticising unit, which may be formed for example by a screw extruder, can be arranged laterally offset from the longitudinal axis of the piston or cylinder of the piston-injection unit. Accordingly, the flowable material can be discharged from the plasticising unit at an angle between 0 and 180 to the piston or cylinder longitudinal axis.
Between plasticising unit and supply opening in the cylinder can be provided a baffle, which guides the flowable material from the plasticising unit to the supply opening and especially facilitates supply of the flowable material perpendicularly to the piston or cylinder longitudinal axis.
From another aspect of the present invention, for which again protection is sought independently and in combination with the other aspects of the present invention, plasticising unit and baffle are not permanently connected, but only abut one another to form a butt connection.
The butt connection can for example be a spherical cap connection, which is pressed together by the two abutting parts, i.e. plasticising unit and baffle, and held firmly and/or under
6 P2171 DEOO Zhafir Plastics Machinery pressure in the abutting direction. However, such a connection permits degrees of movement in other directions and/or about the axis of rotation, such that compensatory movements are possible, e.g. due to different thermal expansion.
BRIEF DESCRIPTION OF THE FIGURES
Further advantages, characteristics and features of the present invention will become clear in the following detailed description of an embodiment with reference to the accompanying drawings. The drawings show here in a purely schematic form in Figure 1 a cross-sectional view of an inventive piston-injection unit;
Figure 2 a cross-sectional view through the piston-injection unit from Fig. 1 along the cross-sectional line A-A; and in Figure 3 a cross-sectional view through the piston-injection unit from Fig. 1 along the cross-sectional line BB.
Fig. 1 shows a cross-sectional view of an embodiment of a piston-injection unit 100. The piston-injection unit comprises a cylinder 11 in which a piston 9 is movably arranged. At one end of the cylinder 11 is provided a nozzle 4 through which flowable material, which is located inside the space 20 between nozzle 4 and the end of the piston 9 facing the nozzle, may be pressed through the nozzle 4. Accordingly, the nozzle 4 can be connected to an injection mould so that the flowable material is pressed into the injection mould.
The flowable material is plasticised in an extruder screw comprising extruder cylinder 2 and the screw 1 and introduced into the cylinder 11 via a baffle 6 and via a slot-shaped supply opening 21.
At one end of the extruder cylinder, the extruder screw has an extruder cylinder head 3, which is connected to an extruder die 34 so that the material transported through the extruder die 34 by the screw may be discharged to the baffle 6. Around the extruder cylinder 2 are provided band heaters 14, which serve to heat and maintain the temperature of the extruder cylinder and thus of the material contained in the extruder cylinder.
BRIEF DESCRIPTION OF THE FIGURES
Further advantages, characteristics and features of the present invention will become clear in the following detailed description of an embodiment with reference to the accompanying drawings. The drawings show here in a purely schematic form in Figure 1 a cross-sectional view of an inventive piston-injection unit;
Figure 2 a cross-sectional view through the piston-injection unit from Fig. 1 along the cross-sectional line A-A; and in Figure 3 a cross-sectional view through the piston-injection unit from Fig. 1 along the cross-sectional line BB.
Fig. 1 shows a cross-sectional view of an embodiment of a piston-injection unit 100. The piston-injection unit comprises a cylinder 11 in which a piston 9 is movably arranged. At one end of the cylinder 11 is provided a nozzle 4 through which flowable material, which is located inside the space 20 between nozzle 4 and the end of the piston 9 facing the nozzle, may be pressed through the nozzle 4. Accordingly, the nozzle 4 can be connected to an injection mould so that the flowable material is pressed into the injection mould.
The flowable material is plasticised in an extruder screw comprising extruder cylinder 2 and the screw 1 and introduced into the cylinder 11 via a baffle 6 and via a slot-shaped supply opening 21.
At one end of the extruder cylinder, the extruder screw has an extruder cylinder head 3, which is connected to an extruder die 34 so that the material transported through the extruder die 34 by the screw may be discharged to the baffle 6. Around the extruder cylinder 2 are provided band heaters 14, which serve to heat and maintain the temperature of the extruder cylinder and thus of the material contained in the extruder cylinder.
7 P2171 DE00 Zhafir Plastics Machinery The extruder die 34 is connected to the baffle 6 via a spherical cap connection 5, with a connecting channel in the form of a connecting bore 19 being present in the baffle 6 so that the material received from the extruder screw may be transported into the supply opening 21 of the cylinder 11. The extruder cylinder 2 is pressed by the ball segment part of the extruder die 34 into the corresponding complementary recess of the baffle, with the extruder cylinder 2 capable, within certain limits, of moving relative to the baffle, while maintaining the channel connection. Thus, compensation movements to compensate, e.g. different thermal expansions, can be realized in a simple way.
The supply opening 21 in the form of a slot in the cylinder 11 is wider in the direction of the longitudinal axis of the cylinder 11 or piston 9, so that it has a larger aperture in the direction parallel to the longitudinal axis of the piston 9 or the cylinder 11 than transversely to it or than the bulk of the corresponding connecting channel in the baffle. Accordingly, the connecting channel 19 in the area where it flows into the supply opening 21 is correspondingly widened or shaped as a slot. The axially elongated supply opening has the advantage that a larger area is available for communication with the axial groove 17 of the flow channel (see below), such that dead spaces are avoided in the flow channel over a larger positioning area of the piston 9.
The baffle 6 is permanently connected to the cylinder 11 via a clamping part 7, which is fastened with bolts to the cylinder 11, as seen particularly in Fig. 2.
However, the baffle could also be arranged in a kind of butt connection at the cylinder 11, with a rigid connection with the extruder cylinder 2 also being possible. In the area of the baffle are provided band heaters 14, which is also apparent from Fig. 2.
At that end of the piston 9 assigned to the nozzle 4, the piston 9 has a sealing area 23 in which the outer surface of the piston 9 lies flat against the inner wall of the cylinder 11 to create a seal through mutual contact. On the side of the sealing area 23 facing away from the nozzle 4 is immediately a radial groove or annular groove 18, as is particularly evident from the cross-sectional view of Fig. 3. This annular groove 18 is on one hand connected to a radial bore 18 and on the other to an axial groove 17 which in turn effects the connection to the supply opening 21. Accordingly, it is possible for flowable material which was plasticised or rendered flowable in the extruder screw 1 to pass into the axial groove 17 of piston 9 via the extruder die 34 and the connecting channel 19 of the baffle 6 and from there to pass into the radial hole 15 or radial connecting section via the annular groove 18. Via a central bore 24,
The supply opening 21 in the form of a slot in the cylinder 11 is wider in the direction of the longitudinal axis of the cylinder 11 or piston 9, so that it has a larger aperture in the direction parallel to the longitudinal axis of the piston 9 or the cylinder 11 than transversely to it or than the bulk of the corresponding connecting channel in the baffle. Accordingly, the connecting channel 19 in the area where it flows into the supply opening 21 is correspondingly widened or shaped as a slot. The axially elongated supply opening has the advantage that a larger area is available for communication with the axial groove 17 of the flow channel (see below), such that dead spaces are avoided in the flow channel over a larger positioning area of the piston 9.
The baffle 6 is permanently connected to the cylinder 11 via a clamping part 7, which is fastened with bolts to the cylinder 11, as seen particularly in Fig. 2.
However, the baffle could also be arranged in a kind of butt connection at the cylinder 11, with a rigid connection with the extruder cylinder 2 also being possible. In the area of the baffle are provided band heaters 14, which is also apparent from Fig. 2.
At that end of the piston 9 assigned to the nozzle 4, the piston 9 has a sealing area 23 in which the outer surface of the piston 9 lies flat against the inner wall of the cylinder 11 to create a seal through mutual contact. On the side of the sealing area 23 facing away from the nozzle 4 is immediately a radial groove or annular groove 18, as is particularly evident from the cross-sectional view of Fig. 3. This annular groove 18 is on one hand connected to a radial bore 18 and on the other to an axial groove 17 which in turn effects the connection to the supply opening 21. Accordingly, it is possible for flowable material which was plasticised or rendered flowable in the extruder screw 1 to pass into the axial groove 17 of piston 9 via the extruder die 34 and the connecting channel 19 of the baffle 6 and from there to pass into the radial hole 15 or radial connecting section via the annular groove 18. Via a central bore 24,
8 P2171 DEOO Zhafir Plastics Machinery the flowable or plasticised material passes into the mouth area 31 of the flow channel formed by the concentric bore 24, the radial connecting section 15, the annular groove 18 and the axial groove 17. Via the mouth 31, which has multiple branched mouth openings, the flowable material passes into the space 20, to be forced out again through the nozzle 4. To prevent backflow of the flowable material from the space 20 into the flow channel 15, 18, 24, 17, at the end of the central bore in the mouth area is provided a check valve 12, which is accommodated in the piston 9 and is therefore also referred to as the piston valve.
The check valve 12 may be formed for example by a movable sealing body which can move in a distribution chamber of the mouth 31 such that the mouth openings are opened when the flowable material flows through the central bore 24 towards the mouth 31, whereas, under opposing pressure, the sealing body makes contact with a sealing surface at the end of the central bore 24 and closes it. Accordingly, given movement of the piston 9 towards the nozzle 4 and corresponding pressure build/up combined with completely filled space 20, the check valve or the piston valve 12 prevents backflow of the flowable material through the mouth 31 and the flow channel 15, 18, 24, 17. Moreover, since the sealing area 23 is provided in the area of the piston head, i.e. at that end of the piston which faces the nozzle 4, flowable material can be prevented from passing counter to the pressing direction into the space between the piston 9 and cylinder inner wall. If, on account of minor leaks in the sealing area 23, smaller quantities of flowable material pass into the space between the piston outer wall and cylinder inner wall, they are trapped by the annular groove 18 which is provided in the immediate vicinity of the sealing area 23 in the piston 9, and are used again in the next injection process.
To prevent backflow of the flowable material from the axial groove 17 counter to the injection direction or piston movement 9 in the direction of the nozzle 4, a second sealing area is provided, which seals the axial groove 17 against the first sealing area 23.
Should minor amounts of plasticised material pass through this sealing area 30 into the area 30 between the piston outer wall and cylinder inner wall, at that end of the cylinder 11 which is opposite the nozzle 4 is provided a scraper part 8, which is arranged in an annular recess of the cylinder 11. The scraper part 8 is formed by a circular cylindrical sleeve, which is preferably made of metal and particularly brass, and has an oblique end face 16 on the side
The check valve 12 may be formed for example by a movable sealing body which can move in a distribution chamber of the mouth 31 such that the mouth openings are opened when the flowable material flows through the central bore 24 towards the mouth 31, whereas, under opposing pressure, the sealing body makes contact with a sealing surface at the end of the central bore 24 and closes it. Accordingly, given movement of the piston 9 towards the nozzle 4 and corresponding pressure build/up combined with completely filled space 20, the check valve or the piston valve 12 prevents backflow of the flowable material through the mouth 31 and the flow channel 15, 18, 24, 17. Moreover, since the sealing area 23 is provided in the area of the piston head, i.e. at that end of the piston which faces the nozzle 4, flowable material can be prevented from passing counter to the pressing direction into the space between the piston 9 and cylinder inner wall. If, on account of minor leaks in the sealing area 23, smaller quantities of flowable material pass into the space between the piston outer wall and cylinder inner wall, they are trapped by the annular groove 18 which is provided in the immediate vicinity of the sealing area 23 in the piston 9, and are used again in the next injection process.
To prevent backflow of the flowable material from the axial groove 17 counter to the injection direction or piston movement 9 in the direction of the nozzle 4, a second sealing area is provided, which seals the axial groove 17 against the first sealing area 23.
Should minor amounts of plasticised material pass through this sealing area 30 into the area 30 between the piston outer wall and cylinder inner wall, at that end of the cylinder 11 which is opposite the nozzle 4 is provided a scraper part 8, which is arranged in an annular recess of the cylinder 11. The scraper part 8 is formed by a circular cylindrical sleeve, which is preferably made of metal and particularly brass, and has an oblique end face 16 on the side
9 P2171DEOO Zhafir Plastics Machinery facing the nozzle. The oblique face 16 serves as a scraper surface and is connected to a discharge opening 10 which may be referred to as a leakage hole.
Since the inner surface of the sleeve-shaped scraper part 8 lies flat against the outer surface of the piston 9, excess flowable material which may be present on the outer surface of the piston 9 is conveyed by the scraper surface 16 towards the discharge opening 10, where it can be collected accordingly. As a result any material to be injected which may adhere in small quantities to the piston outer surface is prevented from being discharged uncontrollably at the end of the cylinder 11 opposite the nozzle 4.
The scraper part 8 is held by a receiving part 22 in the cylinder 11, to which the receiving part 22 is fastened by bolts.
About the circumference of the cylinder 11 and at the nozzle 4 and the cylinder head 13 connecting the nozzle 4 and the cylinder 11 are band heaters 14 for keeping the corresponding components and the plasticised material carried therein at a certain temperature, especially for heating it so that the corresponding flowability is retained.
Although the present invention has been described in detail using a preferred embodiment, it is clear to a person skilled in the art that the invention is not limited to this embodiment, but rather that variations are possible in that the characteristics described are implemented in different combinations or that individual characteristics are omitted, without departing from the scope of the appended claims. In particular, the present invention claims all combinations of all presented individual characteristics.
P2171 DE00 Zhafir Plastics Machinery List of reference numerals 1 Screw 2 Extruder cylinder 3 Extruder cylinder head 4 Nozzle 5 Spherical cap 6 Baffle 7 Clamping part 8 Scraper part 9 Piston
Since the inner surface of the sleeve-shaped scraper part 8 lies flat against the outer surface of the piston 9, excess flowable material which may be present on the outer surface of the piston 9 is conveyed by the scraper surface 16 towards the discharge opening 10, where it can be collected accordingly. As a result any material to be injected which may adhere in small quantities to the piston outer surface is prevented from being discharged uncontrollably at the end of the cylinder 11 opposite the nozzle 4.
The scraper part 8 is held by a receiving part 22 in the cylinder 11, to which the receiving part 22 is fastened by bolts.
About the circumference of the cylinder 11 and at the nozzle 4 and the cylinder head 13 connecting the nozzle 4 and the cylinder 11 are band heaters 14 for keeping the corresponding components and the plasticised material carried therein at a certain temperature, especially for heating it so that the corresponding flowability is retained.
Although the present invention has been described in detail using a preferred embodiment, it is clear to a person skilled in the art that the invention is not limited to this embodiment, but rather that variations are possible in that the characteristics described are implemented in different combinations or that individual characteristics are omitted, without departing from the scope of the appended claims. In particular, the present invention claims all combinations of all presented individual characteristics.
P2171 DE00 Zhafir Plastics Machinery List of reference numerals 1 Screw 2 Extruder cylinder 3 Extruder cylinder head 4 Nozzle 5 Spherical cap 6 Baffle 7 Clamping part 8 Scraper part 9 Piston
10 Leakage bore / discharge opening
11 Cylinder
12 Piston valve / check valve
13 Cylinder head
14 Band heater
15 Radial bore / radial connecting section
16 Oblique discharge surface / end face / scraper surface
17 Axial groove
18 Radial annular groove / annular groove
19 Connecting bore / connecting channel
20 Space
21 Slot / supply opening
22 Receiving part
23 Piston-sealing surface / first sealing area
24 Centric bore Piston-sealing surface / second sealing area 31 Mouth 34 Extruder die 30 100 Piston-injection unit
Claims (33)
1. Piston-injection unit for an injection moulding machine comprising a cylinder (11), a piston (9) movably guided therein and a nozzle unit (4) arranged at one end of the cylinder, wherein by means of the piston flowable material can be pressed through the nozzle, and wherein a supply opening (21) in the cylinder wall is provided in a region which, in every position of the piston (9) during operation, lies on that side of the end of the piston which faces away from the nozzle unit and is assigned to the nozzle unit, such that the flowable material can be introduced into the cylinder (11) transversely to the longitudinal axis of the piston or cylinder, characterised by the fact that the piston (9) has at least a first sealing area (23) at the end of the piston assigned to the nozzle unit, wherein the sealing area has an outer surface of the piston and an inner surface of the cylinder which seal each other by mutual flat contact, and wherein a flow channel (15, 17, 18, 24) for the flowable material is provided in the region between supply opening and the side of the piston assigned to the nozzle unit, said channel opening into the end of the piston facing the nozzle unit at a spaced distance from the outer surface of the piston.
2. Piston-injection unit in accordance with claim 1, characterised by the fact that the flow channel is subject to complete forced flushing when material is transported through the flow channel.
3. Piston-injection unit for an injection moulding machine comprising a cylinder (11), a piston (9) movably guided therein and a nozzle unit (4) arranged at one end of the cylinder, wherein by means of the piston flowable material can be pressed through the nozzle, and wherein a supply opening (21) in the cylinder wall is provided in a region which, in every position of the piston (9) during operation, lies on that side of the end of the piston which faces away from the nozzle unit and is assigned to the nozzle unit, such that the flowable material can be introduced into the cylinder (11) transversely to the longitudinal axis of the piston or cylinder, characterised by the fact that a flow channel (15, 17, 18, 24) for the flowable material is provided in the region between supply opening and the side of the piston assigned to the nozzle unit, said channel opening into the end of the piston facing the nozzle unit, wherein the flow channel is subject to complete forced flushing when material is transported through the flow channel.
4. Piston-injection unit in accordance with claim 3, characterised by the fact that the piston (9) has at least a first sealing area (23) at the end of the piston assigned to the nozzle unit, wherein the sealing area has an outer surface of the piston and an inner surface of the cylinder which seal each other by mutual flat contact, and wherein a flow channel (15, 17, 18, 24) opens into the end of the piston facing the nozzle unit at a spaced distance from the outer surface of the piston.
5. Piston-injection unit in accordance with any of the previous claims, characterised by the fact that at least one second sealing area (30), spaced apart from the first sealing area, is provided.
6. Piston-injection unit in accordance with claim 5, characterised by the fact that the flow channel (15, 17, 18, 24) is provided at least partially between first (23) and second (30) sealing area.
7. Piston-injection unit in accordance with any of the previous claims, characterised by the fact that a mouth (31) of the flow channel is provided at the end face of the piston (9) facing the nozzle unit in a central region close to the longitudinal axis of the piston and in particular concentrically to the piston's longitudinal axis.
8. Piston-injection unit in accordance with claim 7, characterised by the fact that the mouth (31) has several openings.
9. Piston-injection unit in accordance with any of the previous claims, characterised by the fact that the flow channel has a check valve (12).
10. Piston-injection unit in accordance with claim 9, characterised by the fact that the check valve (12) is provided inside the piston.
11. Piston-injection unit in accordance with claim 9 or 10, characterised by the fact that the check valve (12) is provided in a distribution chamber of the flow channel near the mouth, especially with a movably arranged sealing body in the distribution chamber.
12. Piston-injection unit in accordance with any of the previous claims, characterised by the fact that the flow channel comprises a groove (17) running axially in the piston, said groove being especially arranged between the first and second sealing area.
13. Piston-injection unit in accordance with any of the previous claims, characterised by the fact that the flow channel comprises an annular groove (18).
14. Piston-injection unit in accordance with claim 13, characterised by the fact that the annular groove (18) is provided immediately adjacent to the first sealing area (23).
15. Piston-injection unit in accordance with claims 12 and 13, characterised by the fact that the axial groove (17) opens into the annular groove (18).
16. Piston-injection unit in accordance with any of claims 13 to 15, characterised by the fact that the annular groove (18) opens into a radial connecting section (15), which is connected to the mouth (31) of the flow channel.
17. Piston-injection unit in accordance with any of the previous claims, characterised by the fact that the supply opening (21) has a greater opening width in the direction of the longitudinal axis of the piston, than transversely to it.
18. Piston-injection unit for an injection moulding machine comprising a cylinder (11), a piston (9) movably guided therein and a nozzle unit (4) arranged at one end of the cylinder, wherein by means of the piston flowable material can be pressed through the nozzle, and wherein a supply opening (21) in the cylinder wall is provided in a region which, in every position of the piston (9) during operation, lies on that side of the end of the piston which faces away from the nozzle unit and is assigned to the nozzle unit, such that the flowable material can be introduced into the cylinder (11) transversely to the longitudinal axis of the piston or cylinder, characterised by the fact that the supply opening (21) has a greater opening width in the direction of the longitudinal axis of the piston, than transversely to it.
19. Piston-injection unit in accordance with any of the previous claims, characterised by the fact that a scraper part (8) for flat contact with the piston outer wall is provided on the cylinder, wherein a scraper surface which is transverse to the longitudinal axis of the piston or cylinder and encloses the piston (9) is formed in a plane which is provided at an oblique angle to the longitudinal axis of the piston.
20. Piston-injection unit for an injection moulding machine comprising a cylinder (11), a piston (9) movably guided therein and a nozzle unit (4) arranged at one end of the cylinder, wherein by means of the piston flowable material can be pressed through the nozzle unit (4), and wherein a supply opening (21) in the cylinder wall is provided such that the flowable material can be introduced into the cylinder (11) transversely to the longitudinal axis of the piston or cylinder, characterised by the fact that a scraper part (8) for flat contact with the piston outer wall is provided on the cylinder, wherein a scraper surface which is transverse to the longitudinal axis of the piston or cylinder and encloses the piston (9) is formed in a plane which is provided at an oblique angle to the longitudinal axis of the piston.
21. Piston-injection unit in accordance with claim 19 or 20, characterised by the fact that the scraper surface (16) corresponds to a discharge opening (19) in the cylinder (11).
22. Piston-injection unit in accordance with any of claims 19 to 21, characterised by the fact that the scraper part (8) is a cylindrical sleeve or a ring with an end face (16) running obliquely to the longitudinal axis.
23. Piston-injection unit in accordance with any of claims 19 to 22, characterised by the fact that the scraper part (8) is made of metal, especially brass or an alloy thereof.
24. Piston-injection unit in accordance with any of claims 19 to 23, characterised by the fact that the scraper part (8) is accommodated in the cylinder with some clearance play.
25. Piston-injection unit in accordance with any of claims 19 to 24, characterised by the fact that the scraper part (8) is arranged in an annular recess in the cylinder at the end of the cylinder (11) opposite the nozzle unit.
26. Piston-injection unit in accordance with any of claims 19 to 25, characterised by the fact that the scraper part (8) is provided such that it is spaced apart from the second sealing area (30) or in the area of the second sealing area.
27. Piston-injection unit in accordance with any of the previous claims, characterised by the fact that a plasticising unit (1, 2) is arranged laterally offset to the longitudinal axis of the piston or cylinder, said unit discharging the flowable material at an angle of greater than 0° and less than 180° to the longitudinal axis of the piston or cylinder.
28. Piston-injection unit in accordance with claim 27, characterised by the fact that a baffle (6) is provided between plasticising unit and supply opening, wherein at least one butt connection is provided between plasticising unit and baffle.
29. Piston-injection unit for an injection moulding machine comprising a cylinder (11), a piston (9) movably guided therein and a nozzle unit (4) arranged at one end of the cylinder, wherein by means of the piston flowable material can be pressed through the nozzle unit (4), and wherein a supply opening (21) in the cylinder wall is provided such that the flowable material can be introduced into the cylinder (11), wherein a plasticising unit (1, 2) is arranged laterally offset to the longitudinal axis of the piston or cylinder, said unit discharging the flowable material at an angle of greater than 0°
and less than 180° to the longitudinal axis of the piston or cylinder, and wherein a baffle (6) is provided between plasticising unit and supply opening, characterised by the fact that a butt connection is provided between plasticising unit and baffle.
and less than 180° to the longitudinal axis of the piston or cylinder, and wherein a baffle (6) is provided between plasticising unit and supply opening, characterised by the fact that a butt connection is provided between plasticising unit and baffle.
30. Piston-injection unit in accordance with any of claims 28 or 29, characterised by the fact that the butt connection is firmly held and/or pretensioned in the direction of the abutting butt ends.
31. Piston-injection unit in accordance with any of claims 28 to 30, characterised by the fact that the butt connection has one or more degrees of movement freedom for compensation movements.
32. Piston-injection unit in accordance with any of claims 28 to 31, characterised by the fact that the butt connection is a spherical-cap connection.
33. Piston-injection unit in accordance with any of claims 27 to 32, characterised by the fact that the plasticising unit (1, 2) comprises a screw extruder or twin-screw extruder.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007059432.3 | 2007-12-10 | ||
| DE102007059432A DE102007059432A1 (en) | 2007-12-10 | 2007-12-10 | Piston injection unit for an injection molding machine |
| PCT/EP2008/066036 WO2009074445A2 (en) | 2007-12-10 | 2008-11-21 | Piston injection unit for an injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2706985A1 true CA2706985A1 (en) | 2009-06-18 |
| CA2706985C CA2706985C (en) | 2014-02-04 |
Family
ID=40456964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2706985A Active CA2706985C (en) | 2007-12-10 | 2008-11-21 | Piston injection unit for an injection molding machine |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2234786B1 (en) |
| JP (1) | JP5395806B2 (en) |
| CN (1) | CN101896328B (en) |
| CA (1) | CA2706985C (en) |
| DE (1) | DE102007059432A1 (en) |
| WO (1) | WO2009074445A2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH706993A1 (en) * | 2012-09-19 | 2014-03-31 | Alpla Werke | Injection molding apparatus and method for producing a tube head, and tube head. |
| CN103386750B (en) * | 2013-07-30 | 2016-03-02 | 浙江华业塑料机械有限公司 | For the injection moulding apparatus in injection machine |
| JP6335377B1 (en) * | 2017-08-25 | 2018-05-30 | 株式会社ソディック | Light metal injection molding machine |
| CN107650351A (en) * | 2017-11-16 | 2018-02-02 | 江门市汇力精密机械有限公司 | A kind of injection machine with double-lubrication system |
| CN107839177A (en) * | 2017-11-16 | 2018-03-27 | 江门市汇力精密机械有限公司 | A kind of V-type horizontal injection press |
| JP7121182B1 (en) * | 2021-11-29 | 2022-08-17 | 株式会社ソディック | Injection molding machine |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB808369A (en) * | 1956-07-02 | 1959-02-04 | Tube Turns Plastics Inc | Injection-moulding machines |
| FR1193335A (en) * | 1958-03-17 | 1959-11-02 | Low pressure continuous feed transfer pot | |
| GB1056861A (en) * | 1962-06-29 | 1967-02-01 | Inv S Finance Corp | Improvements in or relating to methods of and apparatus for moulding |
| JP2571523B2 (en) * | 1993-09-28 | 1997-01-16 | 日精樹脂工業株式会社 | Injection screw |
| JP3457716B2 (en) * | 1993-10-15 | 2003-10-20 | 三菱重工業株式会社 | Tandem injection molding machine |
| DE29503275U1 (en) * | 1995-02-27 | 1995-05-04 | Hwa Chin Machinery Factory Co | Screw spindle for the material injection pipe of plastic die casting machines |
| JP3586497B2 (en) * | 1995-05-09 | 2004-11-10 | 三菱重工業株式会社 | Injection equipment for serial two-stage injection molding machine |
| KR100293498B1 (en) | 1996-05-13 | 2001-09-17 | 모리시타 요이찌 | Injection device |
| JP3483748B2 (en) * | 1997-12-03 | 2004-01-06 | 東芝機械株式会社 | Pre-plastic injection device |
| US6390798B1 (en) | 1998-03-30 | 2002-05-21 | Sodick Co., Ltd. | Injection apparatus for plunger-injection molding machine having an ejection guide |
| DE19859472A1 (en) * | 1998-12-22 | 2000-11-30 | Krauss Maffei Kunststofftech | Process for the production of injection molded parts reinforced with long fibers |
| JP3390734B2 (en) * | 1999-09-24 | 2003-03-31 | ダイトー化成株式会社 | Adapter for injection molding machine, injection molding machine, and injection molding method |
| DE10137073C2 (en) * | 2001-07-28 | 2003-07-03 | Demag Ergotech Gmbh | Injection unit of an injection molding machine |
| US7284979B2 (en) * | 2004-10-15 | 2007-10-23 | Husky Injection Molding Systems Ltd. | Self aligning articulated joint for use in a hot runner system |
| EP1717010A1 (en) * | 2005-04-25 | 2006-11-02 | Sulzer Chemtech AG | Apparatus having a nozzle with a needle valve for an injection molding machine |
| JP2006341527A (en) * | 2005-06-10 | 2006-12-21 | Toshiba Mach Co Ltd | On-line blending type injection molding machine |
| CN100482444C (en) * | 2006-02-22 | 2009-04-29 | 发那科株式会社 | Controller of injection molding machine |
-
2007
- 2007-12-10 DE DE102007059432A patent/DE102007059432A1/en not_active Withdrawn
-
2008
- 2008-11-21 CA CA2706985A patent/CA2706985C/en active Active
- 2008-11-21 WO PCT/EP2008/066036 patent/WO2009074445A2/en active Application Filing
- 2008-11-21 CN CN2008801198578A patent/CN101896328B/en active Active
- 2008-11-21 EP EP08860132.3A patent/EP2234786B1/en active Active
- 2008-11-21 JP JP2010536403A patent/JP5395806B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009074445A2 (en) | 2009-06-18 |
| JP5395806B2 (en) | 2014-01-22 |
| EP2234786B1 (en) | 2013-11-20 |
| EP2234786A2 (en) | 2010-10-06 |
| CA2706985C (en) | 2014-02-04 |
| CN101896328A (en) | 2010-11-24 |
| JP2011506125A (en) | 2011-03-03 |
| DE102007059432A1 (en) | 2009-06-18 |
| WO2009074445A3 (en) | 2009-09-17 |
| CN101896328B (en) | 2013-11-13 |
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