WO2002032646A1 - Dispositif d'injection auto-etancheifie pour une matiere thermoplastique - Google Patents
Dispositif d'injection auto-etancheifie pour une matiere thermoplastique Download PDFInfo
- Publication number
- WO2002032646A1 WO2002032646A1 PCT/FR2001/003241 FR0103241W WO0232646A1 WO 2002032646 A1 WO2002032646 A1 WO 2002032646A1 FR 0103241 W FR0103241 W FR 0103241W WO 0232646 A1 WO0232646 A1 WO 0232646A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- distributor
- longitudinal
- injection
- needle
- longitudinally
- Prior art date
Links
- 238000002347 injection Methods 0.000 title claims abstract description 59
- 239000007924 injection Substances 0.000 title claims abstract description 59
- 239000012815 thermoplastic material Substances 0.000 title claims abstract description 33
- 238000007789 sealing Methods 0.000 title description 6
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 52
- 239000012080 ambient air Substances 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 18
- 230000000694 effects Effects 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 230000003042 antagnostic effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
- B29C2045/2889—Sealing guide bushings therefor
Definitions
- the present invention relates to a device for injecting, into a molding impression, a thermoplastic material which is in the fluid state when it is brought to a temperature at least equal to a determined limit temperature, higher than the temperature of ambient air, said injection device comprising:
- a dispenser which is capable of being maintained at an injection temperature higher than said determined limit temperature and delimits a passage for dispensing thermoplastic material, comprising at least one outlet for thermoplastic material in a determined longitudinal direction, on one side of the distributor,
- an injection nozzle which is capable of being maintained at an injection temperature higher than said determined limit temperature, is situated on said side of the distributor and secured to it and delimits at least one longitudinal passage for the transit of thermoplastic material, placed in fluid connection with the outlet of the distributor in the opposite direction to said direction and opening in said direction in a front face suitable for integrating into the molding impression,
- At least one longitudinal shutter needle which is mounted for longitudinal sliding inside the transit passage, between a shutter position thereof and an open position thereof, and has a longitudinal extension in the opposite direction to said direction, passing through the distributor to ambient air, on the distributor side longitudinally opposite to said side thereof, by means of guideways to the longitudinal sliding that the distributor presents integrally for this purpose, longitudinally opposite said outlet, the guide means and the extension of the needle having cylindrical longitudinal peripheral faces, respectively inner and outer, in mutual guide contact with relative longitudinal sliding and one of said peripheral faces having a transverse groove, annular, for receiving a seal facing the other of said faces p riphériques in the closure and opening positions and in any longitudinally intermediate position of the closure needle, - means controlled to slide the shutter needle longitudinally from one to the other of the shutter and opening positions, which are arranged in ambient air on the side of the distributor longitudinally opposite said side of that -this and are functionally connected to the extension of the shutter needle.
- Such a device is well known in many embodiments, and for example described in French patent application No. 00 03892 filed on March 28, 2000 by the Applicant, which describes various methods suitable for ensuring a determined positioning of the front face of the injection nozzle in particular in relation to various methods of integral assembly of the latter with the distributor and of mutual assembly of various components of this injection nozzle.
- the object of the present invention is to propose an embodiment of this seal which is satisfactory in all these respects and, for this purpose, the present invention provides an injection device of the type indicated in the preamble, characterized in that said groove is offset longitudinally with respect to the distribution passage, in the opposite direction to said direction, by a determined distance (d), so that, under the effect of ambient air, it is by thermal conduction brought to a temperature which is lower than the injection temperature but higher than said limit temperature determined when the distributor and the injection nozzle are maintained at the injection temperature, and the thermoplastic material leaking in the fluid state between said peripheral faces interior and exterior reaches said groove fills the latter and has a viscosity such that it stops there and constitutes itself the seal.
- d determined distance
- thermoplastic material itself as a seal between the outer peripheral face of the extension of the shutter needle and the inner peripheral face of the means for guiding this extension longitudinal sliding with respect to the dispenser makes it possible to obtain an effective and durable seal, intrinsically insensitive to the rise in temperature experienced by the extension of the shutter needle and the guide means during an injection operation, and at any risk of disturbance by the thermoplastic material in the fluid state since it is itself that provides the seal.
- the groove of one of the peripheral faces between which the seal is thus established then constitutes for the thermoplastic material both a reserve allowing the seal to be preserved even in the event of a difference in thermal expansion between these faces by compensating for these differences , and a stop means against a tendency to migrate beyond these faces.
- said inner and outer peripheral faces and said groove will be of revolution around the same longitudinal axis and / or said groove will be arranged in the inner peripheral face of the guide means, although d other transverse conformations of said peripheral faces, for example polygonal or plano-convex, suitable in particular in the case where several shutter needles are mutually juxtaposed in multi-material injection devices, and respectively adapted conformations of the groove can also be chosen without departing from the scope of the present invention.
- the guide means to comprise a longitudinal sleeve which is placed on the side of the distributor longitudinally opposite said side of the latter and secured to the distributor, protrudes relative to the distributor in the opposite direction to said direction, partly defines said inner peripheral face and is placed in contact with ambient air in particular transversely opposite to said inner peripheral face.
- said groove is arranged in the part of said inner peripheral face which is defined by the sleeve.
- the means controlled to slide the shutter needle longitudinally from one to the other of the shutter and opening positions comprise a longitudinal annular cylinder, disposed around the sleeve, respecting a continuous annular clearance relative thereto and comprising on the one hand a body integral with the distributor and on the other hand a piston longitudinally integral with the extension of the shutter needle.
- annular cylinder known in itself, certainly provides in this case the advantage also known of a small longitudinal bulk; however, it also provides a specific advantage, in the case of a device according to the invention, in that the preservation of a continuous annular clearance between its piston and the guide sleeve makes it possible to have around this sleeve a ambient air cushion for easy cooling by the latter at the level of the groove for receiving the thermoplastic material.
- FIG. 1 unique, shows part of a device according to the invention, for injecting thermoplastic material in the fluid state into a molding impression, partly in section through a plane including a longitudinal axis of a injection nozzle forming part of this device.
- a mold 1 delimiting a molding imprint 2 by a face 3.
- an injection well 5 which opens out to on the one hand in the face 3, in the longitudinal direction of injection 130, and on the other hand in a face 6 of the mold 1, opposite to the face 3 along the axis 4, in a longitudinal direction 131 opposite to the direction of injection 130.
- an injection nozzle 7 carried integrally and removably by a distributor 8 of material to be injected, brought and maintained at an injection temperature above a determined limit temperature, called “temperature viscoelasticity ", itself higher than the temperature of the ambient air and from which the thermoplastic material is in the fluid state, so that this material is brought and maintained in a plastic state before its introduction into the distributor 8 by means not shown and until it arrives in the cavity 2 via the injection nozzle 7.
- a distributor 8 of material to be injected brought and maintained at an injection temperature above a determined limit temperature, called “temperature viscoelasticity ", itself higher than the temperature of the ambient air and from which the thermoplastic material is in the fluid state, so that this material is brought and maintained in a plastic state before its introduction into the distributor 8 by means not shown and until it arrives in the cavity 2 via the injection nozzle 7.
- the distributor 8 is mounted on a sole 9 which essentially overlaps the distributor 8 by the side thereof longitudinally opposite to the mold 1 and which is fixed to the face 6 of the mold by means not shown, under conditions such that the distributor 8 can undergo expansion with respect to the sole 9 and to the mold 1 during its rise in temperature at the start of an injection operation, under conditions suitable for ensuring the abovementioned coaxiality of the nozzle 7 and the injection well 5 when the distributor 8, the mold 1 and the sole 9 have stabilized at the temperature which they present during an injection process.
- the mounting methods of the distributor 8 on the sole 9 and of the sole 9 on the face 6 of the mold 1, for this purpose, are known to a person skilled in the art and external to the present invention, so that they will not be not described further.
- the distributor 8 carries the nozzle 7 via a support
- the mounting support 10 is fitted along the axis 4 in the distributor 8 which, for this purpose, is drilled right through, along this axis 4, with a hole 14 which runs right through the passage 11, each side of which there is a part of this hole 14.
- the coaxial fitting of the support 10 in the hole 14 takes place without play and the support 10 is retained, in an integral but removable manner, on the distributor 8 by longitudinal tightening of the latter between an annular, transverse flange 15 than the support 10 is integrally present on the same side of the distributor 8 as the mold 1, the cavity 2 and the nozzle 7, and a transverse ring 16 screwed coaxially on a thread not referenced that the support 10 has on the other side of the distributor 8.
- the nozzle 7 is essentially formed of an integral but removable assembly. , of several components and in particular of a nozzle body 17 which can be produced in a single piece with the support 10 or be assembled integrally but removably thereto, and of a nozzle endpiece 18 which succeeds the nozzle body 17 in the direction of injection 130 and which connects this nozzle body 17 to the cavity 2 and, in particular, defines the front face 13.
- the nozzle body 17 has a generally tubular shape of axis
- the end piece 18 constitutes, with respect to the nozzle body 17, a narrowing in the direction of injection 130 also well externally, to connect to the cavity 2 in a transversely narrowed zone of the injection well 5, directly adjacent to the face 3 to which the front face 13 is connected on all sides, only internally, to define at the level of the face 13 a mouth 19 transversely narrowed from the passage 12 in the cavity 2.
- the end piece 18 defines around the passage 12 an annular shoulder, transverse 20 turned in the direction 131 and having for example a frustoconical shape of revolution around the axis 4 and narrowing towards the mouth 19, in the direction of injection 130, to form a sealing seat for a shutter needle 21, longitudinal, which is housed coaxially inside the passage 12, being guided in longitudinal sliding relative to the body 17 and to the nozzle 18 of the nozzle 7 in order to be able to move longitudinally, in a controlled manner, relative to the latter between a position for closing the passage 12 at the end piece 18, illustrated in the left half of FIG. 1, and a position for opening the passage 12 in particular at the end piece 18, as illustrated in the right half of FIG. 1.
- the shape of the shutter needle 21 is known in itself, in correlation with the shape of the end piece 18, so as to define the opening and closing states of the passage 12 at the level thereof.
- this needle 21 has a front face 22 which is turned in this direction of injection 130 and which, in the closed position, is flush with the front face 13 of the end piece 18, itself flush with the face 3 of the imprint 2 when the mold 1, the nozzle 7, the distributor 8 and the sole 9 have stabilized at the temperature which they present during an injection process, while, in the open position, this front face 22 is set back, in the direction 131, relative to the shoulder 20.
- the shape of the front faces 22 and 13 and their orientation relative to the axis 4 are linked to that of the face 3 of the 'fingerprint 2; in the example illustrated, they are planar and perpendicular to the axis 4 like the face 3 of the imprint 2, but they could also have a shape different from a planar shape and / or be oriented obliquely with respect to the axis 4.
- the needle 21 Set back in the direction 131 relative to the face 22, the needle 21 has an annular shoulder, transverse 23 of the same orientation as this face 22, which shoulder 23 has a conicity identical to that of the shoulder 20 on which it s 'applies, in a mutual sealing relationship, in the closed position while it is set back, in the direction 131, relative to this shoulder 20 in the open position.
- the needle 21 is delimited by an external peripheral face not referenced which, in the closed position, comes to marry an internal peripheral face, also not referenced, that the end piece 18 has between the shoulder 20 of the face 13 to delimit the passage 12 in the immediate vicinity of the mouth 19, which also creates a seal between the shutter needle 21 and the nozzle 18 at this level in the closed position .
- the seal between the shutter needle 21 and the endpiece 18 in the closed position could be ensured exclusively by mutual contact between the shoulders 20 and 23 or by mutual contact between the peripheral faces. respectively outer of the shutter needle 21 and inner of the endpiece 18 in the immediate vicinity of the mouth 19.
- Other arrangements could also be chosen for this purpose without departing from the scope of this invention.
- thermoplastic material has a conformation also known in itself, suitable for leaving around it, inside the passage 12, a free cross section sufficient to allow the thermoplastic material to be conveyed in the fluid state from the passage 11 to the mouth 19.
- Any suitable means can be provided at this level, between the nozzle body 17 and the shutter needle 21, to ensure both the coaxiality thereof with respect to the passage 12 and a guide of the needle 21 with longitudinal sliding relative to the body of nozzle 17, between the closing and opening positions of the mouthpiece 19 at the endpiece 18.
- the shutter needle 21 is guided in coaxial sliding in the mounting support 10 by a coaxial extension 24 in which it is screwed coaxially or with which it is secured by any other means, preferably removably, in an area of the passage 12 situated longitudinally opposite the mouth 19, that is to say in the immediate vicinity of the bent passage 25 connecting this passage 12 to the passage 11 of distributor 8.
- the extension 24 passes right through the mounting support 10 and has outside the distributor 8, opposite the nozzle 7 relative to the latter along the axis 4, an end 26 into which is screwed so integral but removable a bolt 27 for releasably securing a transverse washer 28, annular of revolution about the axis 4, for connection with a joint movement of longitudinal translation with a piston 29 of a hydraulic cylinder 30 double acting.
- This jack 30 moreover has a body 31 fixed in an integral but removable manner, for example by buttoning, on a corresponding zone of the sole 9 so that a controlled longitudinal translation of its piston 29 relative to its body 31 allows, by means of the washer 28, either to pull the end 26 along the axis 4, in the direction 131 which is the direction of a distancing of the end 26 relative to the face 13 of the end piece 18, to bring the shutter needle 21 in its position for opening the passage 12 towards the imprint 2, or to push the needle 21 in the opposite direction 130 to bring it to the position for closing the passage 12 at the end piece 18.
- said zone of the sole 9 is drilled right through, according to the axis 4, of a hole 32 delimited towards axis 4 by three inner peripheral faces 33, 34, 35, cylindrical of revolution around an axis which will be considered to coincide with axis 4, with diameters increasingly large, which faces 33, 34, 35 follow one another in this order in the direction 131 and are connected two by two by annular shoulders, planes, transverse 36, 37 turned in the same direction 131.
- the axis of the hole 32 may however undergo a slight transverse offset relative to the axis 4 taking into account differences in thermal expansion which may appear between the sole 9 and the distributor 8 carrying the mounting support 10 which ensures, in particular by a part 38 in the form of a tubular sleeve which will be described now, the guiding of the extension 24 of the injection needle 21 to the longitudinal sliding along the axis 4 and thus defines the position of this axis 4; indeed, the distributor 8 is brought to a temperature higher than that of the sole 9, much more exposed to the ambient air and consequently better cooled by the latter, during the injection of a thermoplastic material in the fluid state. .
- the support 10 is extended in the direction 131 inside said zone of the sole 9 by the part in the form of a tubular sleeve 38 which is delimited, in the direction of a distance from axis 4, by a cylindrical outer peripheral face 39 of revolution about this axis with a diameter substantially smaller than that of the inner peripheral face 33 of the hole 32, as well as the diameter of the thread not referenced from the support 10, receiving ring 16.
- this face 39 is connected to an annular front face 40, planar, of revolution about the axis 4 to which it is perpendicular, which face 40 is turned in this direction 131 and situated at an intermediate level of the inner peripheral face 35 of the hole 32.
- the support 10, including the sleeve-shaped part 38 is delimited towards the axis 4 by an inner peripheral face 41 cylindrical of revolution around the axis 4.
- the extension 24 of the shutter needle 21 is placed in guide contact with the relative longitudinal sliding with this face 41 by an external peripheral face 42 which is also cylindrical of revolution around the axis 4, with a diameter substantially identical to that of the face 41, and which delimits the extension 24 of the shutter needle 21, in the direction of a distance with respect to the axis 4, of the connection of this extension 24 with this needle 21 to the end 26 of this extension 24.
- this extension 24 is dimensioned so that both in the position of the shutter needle 21 corresponding to the closure of the passage 12 and in the position corresponding to the opening thereof, the end 26 of this extension 24 is permanently located outside of the sleeve-shaped part 38, that is to say projecting relative to the front face 40 in the direction 131 while the connection of the extension 24 with the needle 21 remains inside the passage 12 or the bent passage 25.
- the face 41 is hollowed out with at least one groove 43 suitable for receiving a sealing material, being it is understood that the cooperation between the support 10 and the dispenser 8 also also provides a seal with respect to the thermoplastic material in the fluid state respectively on either side of the passage 11.
- this sealing material consists of the thermoplastic material itself, which leaks from the bent passage 25 by creeping between the faces 41 and 42 and migrating between them in the direction 131, and stops at the level of the groove 43, accumulating there, taking into account on the one hand a positioning longitudinally determined therefrom and on the other hand because it is at a temperature below the injection temperature.
- the groove 43 undergoes cooling by thermal conduction through the sleeve-shaped part 38 and along the extension 24 of the shutter needle 21, in the direction 130, due to the exposure to the ambient air of the sleeve-shaped part 38, by its faces 39 and 40, and of the extension 24, at its end 26 and in its part adjacent to and situated outside of the sleeve-shaped part 38, while the part of the extension 24 situated inside the bent passage 25 and the parts of the mounting support 10 delimiting this bent passage 25 are exposed to the injection temperature at which the thermoplastic material is kept inside the distribution passage 11 and the transit or injection passage 12, which on the other hand tends to cause the groove 43 to heat up by thermal conduction in the direction 131 along the mounting support 10 and the extension 24 of the injection needle 21.
- the dimensioning and the longitudinal positioning of the groove 43 inside the sleeve-shaped part 38, with respect to the bent passage 25 and the distribution passage 11, that is to say the longitudinal distance d separating the throat 43 of passages 11 and 25 can be easily determined by a person skilled in the art, within the framework of his normal abilities, depending in particular on the coefficient of thermal conduction of the materials constituting the sleeve-shaped part 38 of the support of mounting 10 and the extension 24 of the shutter needle 21, of their respective shapes and dimensions, of a range of injection temperatures which may be those of the thermoplastic material taking into account the nature of the latter, of a mode of evolution the viscosity of this thermoplastic material or of a determined range of thermoplastic materials as a function of the temperature and of a plausible range of ambient air temperatures, so that the temperature at which the groove 43 is brought to an injection process, which is intermediate between the ambient air temperature and the injection temperature by balancing between the aforementioned antagonistic effects of cooling and heating by thermal conduction, remains still above the limit temperature from which the thermoplastic material is
- the part 38 in the form of a sleeve has, between the groove 43 and the front face 40, a rectilinear slot 45 which opens into the front face 40 as well as into the outer peripheral 39 and inner peripheral 41 faces, along a mean plane including the axis 4 , and in this slot 45 is engaged, with the possibility of longitudinal sliding without the possibility of rotation around the axis 4, a boss 44 connected in one piece with the extension 24 of the shutter needle 21 or produced in the form of 'a pin secured to this extension 24.
- This boss 44 forms a projection, perpendicular to the axis 4, relative to the outer peripheral face 42 of the extension 24, over a distance corresponding, at most, to the thickness of the part 38 in the form of a sleeve, measured between its faces 39 and 41, perpendicular to the axis 4.
- the respective longitudinal dimensions of the passage 44 and of the slot 45 are such that they do not constitute an obstacle to the ev evolution of the shutter needle 21, integrally with its extension 24, from one to the other of its open and closed positions, and that the retainer meets a relative rotation about the axis 4 is maintained from one to the other of these positions as well as in one and the other.
- the jack 30 is disposed coaxially with the hole 32, that is to say at least approximately coaxially with the needle 21, and its piston 29 is linked to the washer 28, integral with the extension 24 itself secured to the injection needle 21, by means of a transmission member 46 which, while ensuring a connection without play along the axis 4, allows a relative movement perpendicular to this axis to allow a slight joint displacement of the hole 32 and of the jack 30 relative to the nozzle 7, taking into account the aforementioned differences in thermal expansion between, on the one hand, the sole 9 carrying the body 31 of the jack 30 in solid, and, on the other hand, the distributor 8, integrally carrying the support 10 which determines the position of the axis 4.
- the jack 30 is coaxial with the nozzle 7, and more precisely has a symmetry of revolution around axis 4 as described with regard to hole 32.
- the cylinder 30 has been illustrated in such a position in FIG. 1, to which reference will be made for the description of this cylinder, essentially limited to the characteristics of this cylinder, the choice of which corresponds to a preferred embodiment of the present invention. It appears from this figure that the jack 30 is an annular type jack, the piston 29 and the body 31 of which are both annular of revolution about the axis 4.
- the body 31 is delimited by respectively external and frontal peripheral faces, not referenced, by which it fits into a housing defined in inside the hole 32, by the shoulders 36 and 37 by its inner peripheral face 34 and by a part of the inner peripheral face 35 directly adjacent to the shoulder 37, under conditions easily determinable by a skilled person, capable of ensuring a rigorous positioning of the actuator body 31, both longitudinally and transversely, relative to the sole 9, and to ensure that the body 31 is placed back, longitudinally, inside the hole 32 relative to a face 54, for example planar and perpendicular to plane 4, which delimits the sole 9 in the direction 131, that is to say longitudinally opposite the distributor 8, the nozzle 7 and the mold 1 ; at this face 54, a removable cover 55 protects the jack 30, inside the hole 32.
- the body 31 Towards axis 4, the body 31 has two interior peripheral faces 56 and 68, both cylindrical of revolution around the axis 4 towards which they are turned, with the same diameter smaller than that of the inner peripheral face 33 of the hole 32.
- the faces 56 and 58 are mutually spaced longitudinally so that the body 31 delimits between them in a sealed manner, in both directions 130 and 131 as well as in the direction of a distance with respect to the axis 4, a cavity 74 annular of revolution around axis 4.
- the body 31 guides the piston 29 to coaxial sliding.
- the piston 29 comprises a rod 69 delimited, in the direction of a distance from the axis 4, by an outer peripheral face 70 cylindrical of revolution around the axis 4 with a diameter identical to that of faces 56 and 68, with which the face 70 is placed in sealing contact, for example due to the presence of suitable seals, not referenced, so that the rod 69 of the piston delimits sealingly, towards the axis 4, the annular cavity 74 of the body 31.
- the rod 69 carries integrally, projecting in the direction of a distance with respect to the axis 4 with respect to its face 70, a transverse plate 75, annular of revolution around the axis 4 and delimited, in the direction of a distance from it, by an outer peripheral face 76 cylindrical of revolution around this axis with a diameter identical to that of an inner peripheral face 58 of the body 31, also cylindrical of revolution around the axis 4 and delimiting the cavity 74 in the direction of a distance relative to the axis 4.
- the face 76 is placed in sliding contact with this face 58, opposite -vis which the plate 75 is sealed for example by means of an appropriate seal, not referenced.
- the plate 75 has a dimension smaller than that of the cavity 74, so that the plate 75 subdivides the latter, in a sealed manner, into two chambers 80, 81 sealed, annular of revolution around axis 4, the respective volumes of these two chambers 80 and 81 varying correlatively in an opposite manner when the plate 75 slides in one direction or the other inside the cavity 74, relative to the body 31 , that is to say when the piston 29 moves longitudinally, in one direction or the other, relative to this body 31.
- Chambers 80 and 81 are offset respectively in the direction
- the face 70 of the rod 69 is itself dimensioned longitudinally, respectively on either side of the plate 75, so as to remain partially projecting longitudinally in the direction 130 and in the direction
- the longitudinal dimensions of the parts of the face 70 situated respectively on either side of the plate 75 are measured respectively between the plate 75 and a transverse, flat face 84, annular of revolution around the axis 4, turned in the direction 130 and thus placed in longitudinal projection in this direction 130 relative to the body 31, and between the plate 75 and a transverse face, planar 85, annular of revolution around the axis 4 to which it is perpendicular, which face 85 is thus rotated in the direction 131 and placed in longitudinal projection in the direction 131 relative to the body 31.
- the rod 69 thereof has in the illustrated example a tubular shape and it is delimited towards the axis 4 by an inner peripheral face 86 of cylindrical revolution around this axis 4 with a diameter greater than that of the outer peripheral face 39 of the sleeve-shaped part 38 of the support 10 for mounting the nozzle 7 on the distributor 8 and a fortiori that of the outer peripheral face 42 of the extension 24 of the shutter needle 21, which makes it possible to arrange the rod 69 of the piston partly around the sleeve-shaped part 38, as shown in FIG. 1.
- the inner peripheral face 86 thus extends longitudinally from the face 84 up to the immediate vicinity of the face 85, to which it is connected by means of a thread 87 by which the rod 69 of the piston 29 receives in an integral but removable manner the member 46 for transmitting movement.
- this member 46 has a generally annular shape of revolution around the axis 4 and, in particular, has a part 88 in the form of a sleeve comprising, in the direction of a distance from the axis 4, a thread 89 complementary to the thread 87 and engaged with the latter.
- the sleeve-shaped part 88 thus placed inside the piston rod 69, is moreover delimited in the direction of approximation with respect to the axis 4 by a cylindrical inner peripheral face 90 of revolution around this axis with a diameter less than that of the inner peripheral face 86 but greater than that of the outer peripheral face 42 of the extension 24 of the shutter needle 21 so that remains between the face 90 and the face 24, as well as between the face 86 on the one hand, the faces 24 and 39, on the other hand, a continuous annular clearance 132, circumferentially and longitudinally, allowing a limited transverse movement between the jack 30 carrying the member 46 , on the one hand, the extension 24 of the shutter needle 21 and the sleeve-shaped part 38 of the support 10, on the other hand.
- This continuous tubular clearance 132 open to the ambient air by the assembly clearances between the various components of the injection device, as well as, if necessary, by passages arranged for this purpose for example between the body of the jack 31 and the faces 34 to 37 of the hole 32, in a manner not shown but easily conceivable by a person skilled in the art, also makes it possible to place in contact with this ambient air the faces 43 and 58 of the sleeve-shaped part 38 as well as the face 42 of the extension 24 of the shutter needle 21, in the part of this face 42 projecting from the sleeve-shaped part 38, which contributes to the cooling of this sleeve-shaped part 38 and the extension 24 at the level of the groove 43, and consequently at that of the thermoplastic material reaching the latter by migration between the faces 41 and 42 from the bent passage 25, in a desired manner in accordance with the present invention.
- the external peripheral thread 89 is connected to the internal peripheral face 90 by a planar transverse face 91, annular of revolution around the axis 4 to which it is perpendicular, this face 91 being oriented in the direction 130 like the face 84 with respect to which it is placed largely set back, longitudinally, inside the rod 69 so as to respect a longitudinal spacing with respect to the face 40 of the shaped part sleeve 38 of the support 10, whatever the position of the piston 29 relative to the cylinder body 31, within the limits imposed by the stop of the plate 75 in the directions 130 and 131 against the body 31 inside the cavity 74 so that the longitudinal continuity of the clearance 132 is preserved whatever this position.
- the external peripheral thread 89 is connected to a shoulder transverse, plane 92, annular of revolution about the axis 4 to which it is perpendicular, this shoulder 92 being oriented like the face 91 and placed longitudinally opposite the face 85 of the piston rod 69.
- the shoulder 92 is supported on this face 85 to limit the screwing and the longitudinal insertion of the sleeve-shaped part 88 inside the piston rod 69.
- this sleeve-shaped part 38 is connected integrally, in the direction 131, to a part 133 of the transmission member 46, which is external to the position rod 29 and has the general shape of an annular ring of revolution around the axis 4, towards which this ring defines, in a manner known per se, an annular groove 134 of revolution around this axis.
- the washer 28 is received, without longitudinal play but with transverse play on all sides, in this groove 134 so that, while being liable to undergo a mutual transverse offset on all sides, the piston 29 of the actuator 30 and the shutter needle 21 form a unit integral with respect to longitudinal displacements in one direction and in the other.
- a hydraulic fluid can be introduced at will into the chamber 80 or the chamber 81, selectively, by evacuating the hydraulic fluid which may be in the other of these chambers, which are connected for this purpose.
- a hydraulic fluid circuit not shown, external to the jack 30, by means of fittings such as 110, in a manner well known to a person skilled in the art and which will therefore not be described.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Coating Apparatus (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002212413A AU2002212413A1 (en) | 2000-10-20 | 2001-10-19 | Self-sealing injection device for thermoplastic material |
JP2002535864A JP2004511362A (ja) | 2000-10-20 | 2001-10-19 | 熱可塑性材料を射出するためのセルフシーリング射出装置 |
MXPA03003535A MXPA03003535A (es) | 2000-10-20 | 2001-10-19 | Dispositivo de inyeccion de auto-sellado para material termoplastico. |
EP01980603A EP1326740A1 (fr) | 2000-10-20 | 2001-10-19 | Dispositif d'injection auto-etancheifie pour une matiere thermoplastique |
BR0107350-8A BR0107350A (pt) | 2000-10-20 | 2001-10-19 | Dispositivo de injeção de um material termoplástico em uma cavidade de moldagem |
US10/399,556 US7018198B2 (en) | 2000-10-20 | 2001-10-19 | Self-sealing injection device for thermoplastic material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR00/13451 | 2000-10-20 | ||
FR0013451A FR2815568B1 (fr) | 2000-10-20 | 2000-10-20 | Dispositif d'injection auto-etancheifie pour une matiere thermoplastique |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002032646A1 true WO2002032646A1 (fr) | 2002-04-25 |
Family
ID=8855549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/003241 WO2002032646A1 (fr) | 2000-10-20 | 2001-10-19 | Dispositif d'injection auto-etancheifie pour une matiere thermoplastique |
Country Status (9)
Country | Link |
---|---|
US (1) | US7018198B2 (fr) |
EP (1) | EP1326740A1 (fr) |
JP (1) | JP2004511362A (fr) |
KR (1) | KR100771766B1 (fr) |
AU (1) | AU2002212413A1 (fr) |
BR (1) | BR0107350A (fr) |
FR (1) | FR2815568B1 (fr) |
MX (1) | MXPA03003535A (fr) |
WO (1) | WO2002032646A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7291304B2 (en) * | 2004-07-01 | 2007-11-06 | Husky Injection Molding Systems Ltd. | Coinjection molding cooled shooting pot cylinder |
US7226283B2 (en) * | 2004-10-13 | 2007-06-05 | Mold-Masters Limited | Injection molding apparatus with a melt channel in valve pin |
DE102005049605A1 (de) * | 2004-10-19 | 2006-04-20 | Mold-Masters Ltd., Georgetown | Verteilereinsatz für eine Spritzgießvorrichtung |
PT3326776T (pt) | 2014-03-10 | 2020-01-21 | Inglass Spa | Placa de fixação de um molde de um aparelho de moldagem de material plástico por injeção |
EP3785880B1 (fr) | 2014-10-15 | 2022-05-04 | Inglass S.p.A. | Appareil de moulage par injection de matière plastique |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1500630A (fr) * | 1965-11-12 | 1967-11-03 | Ici Ltd | Perfectionnements aux machines de moulage par injection permettant de supprimer les masselottes |
DE2615282A1 (de) * | 1975-04-10 | 1976-11-18 | Gellert Jobst U | Ventildichtung fuer spritzgussmaschine |
EP0099088A2 (fr) * | 1982-07-12 | 1984-01-25 | Jobst Ulrich Gellert | Douille pour l'aiguille d'obturateur pour moulage par injection et son procédé de fabrication |
US5387099A (en) * | 1994-02-14 | 1995-02-07 | Gellert; Jobst U. | Injection molding valve member sealing bushing with a thin collar portion |
FR2795993A1 (fr) * | 1999-07-06 | 2001-01-12 | Delachaux Sa | Dispositif d'injection de matiere a l'etat plastique dans une empreinte de moulage |
-
2000
- 2000-10-20 FR FR0013451A patent/FR2815568B1/fr not_active Expired - Fee Related
-
2001
- 2001-10-19 KR KR1020027007956A patent/KR100771766B1/ko not_active IP Right Cessation
- 2001-10-19 US US10/399,556 patent/US7018198B2/en not_active Expired - Fee Related
- 2001-10-19 AU AU2002212413A patent/AU2002212413A1/en not_active Abandoned
- 2001-10-19 EP EP01980603A patent/EP1326740A1/fr not_active Withdrawn
- 2001-10-19 JP JP2002535864A patent/JP2004511362A/ja active Pending
- 2001-10-19 WO PCT/FR2001/003241 patent/WO2002032646A1/fr active Application Filing
- 2001-10-19 BR BR0107350-8A patent/BR0107350A/pt active Search and Examination
- 2001-10-19 MX MXPA03003535A patent/MXPA03003535A/es active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1500630A (fr) * | 1965-11-12 | 1967-11-03 | Ici Ltd | Perfectionnements aux machines de moulage par injection permettant de supprimer les masselottes |
DE2615282A1 (de) * | 1975-04-10 | 1976-11-18 | Gellert Jobst U | Ventildichtung fuer spritzgussmaschine |
EP0099088A2 (fr) * | 1982-07-12 | 1984-01-25 | Jobst Ulrich Gellert | Douille pour l'aiguille d'obturateur pour moulage par injection et son procédé de fabrication |
US5387099A (en) * | 1994-02-14 | 1995-02-07 | Gellert; Jobst U. | Injection molding valve member sealing bushing with a thin collar portion |
FR2795993A1 (fr) * | 1999-07-06 | 2001-01-12 | Delachaux Sa | Dispositif d'injection de matiere a l'etat plastique dans une empreinte de moulage |
Also Published As
Publication number | Publication date |
---|---|
AU2002212413A1 (en) | 2002-04-29 |
JP2004511362A (ja) | 2004-04-15 |
FR2815568B1 (fr) | 2003-06-27 |
MXPA03003535A (es) | 2003-08-07 |
US20040022893A1 (en) | 2004-02-05 |
BR0107350A (pt) | 2002-09-17 |
KR100771766B1 (ko) | 2007-10-30 |
EP1326740A1 (fr) | 2003-07-16 |
FR2815568A1 (fr) | 2002-04-26 |
KR20020065591A (ko) | 2002-08-13 |
US7018198B2 (en) | 2006-03-28 |
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