WO1992002350A1 - Dispositif a buse pour moulage et par injection - Google Patents
Dispositif a buse pour moulage et par injection Download PDFInfo
- Publication number
- WO1992002350A1 WO1992002350A1 PCT/JP1991/001032 JP9101032W WO9202350A1 WO 1992002350 A1 WO1992002350 A1 WO 1992002350A1 JP 9101032 W JP9101032 W JP 9101032W WO 9202350 A1 WO9202350 A1 WO 9202350A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fluid
- valve
- nozzle body
- passage
- opening
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1734—Nozzles therefor
- B29C45/1735—Nozzles for introducing the fluid through the mould gate, e.g. incorporated in the injection nozzle
-
- 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
- B29C45/20—Injection nozzles
-
- 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
- B29C45/20—Injection nozzles
- B29C45/23—Feed stopping equipment
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/224—Injection mold nozzle valve
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/812—Venting
Definitions
- the present invention relates to an injection molding nozzle device used for injection molding of a synthetic resin, and more particularly, to press-in a molten synthetic resin and a fluid such as a gas body into a mold cavity of a mold. Accordingly, the present invention relates to an injection molding nozzle device used for forming a molded body having a hollow portion formed by a fluid.
- the nozzle When the resin passage is closed, the nozzle opens from the nozzle valve opening. The fluid can be pressed into the mold cavity via the body opening. On the other hand, when the needle valve is retracted, pressure contact between the periphery of the nozzle body opening and the tip of the needle valve is made. Since Z is released and the nozzle body opening is opened to the resin passage, the molten synthetic resin can be pressed into the mold cavity from the nozzle body opening.
- the conventional injection molding nozzle device has a check valve in the fluid passage to prevent the molten synthetic resin from flowing back into the fluid passage when the molten synthetic resin is pressed into the mold cavity. Since the fluid is provided, once the fluid is press-fitted into the mold cavity, the fluid cannot be collected or discharged through the fluid passage. For this reason, the fluid injected into the mold cavity is discharged by separating the mold from the nozzle body and discharging the fluid directly from the mold. However, this not only makes it difficult to recover and reuse the fluid, but also makes it impossible to control the fluid pressure in the mold cavity, for example, by gradually reducing the fluid pressure in the mold cavity. However, there is a problem that a molded product is likely to be defective.
- the pressure of the fluid injected into the mold cavity is: a.
- the resin layer including the hollow portion is pressed to prevent the occurrence of sink marks.
- the pressure of this fluid is high, a residual strain is generated in the resin layer including the hollow portion.
- a hollow portion is selectively formed only at a specific position of a mold cavity, residual strain concentrated at the interface between the hollow portion and the solid portion is generated.
- Microcrazing or whitening occurs around the hollow part.
- caging occurs after a lapse of time due to stress relaxation over time after molding.
- the pressure of the fluid in the hollow portion is released to the atmospheric pressure prior to the process of removing the molded product. This takes time, lengthens the molding cycle and reduces productivity.
- an injection molding nozzle device capable of recovering or discharging a fluid press-fitted into a mold cavity through a fluid passage is disclosed in Japanese Patent Publication No. 30723/1989. Being proposed Yes.
- the injection molding nose device will be described.
- a 21-dual valve that opens and closes the resin passage by moving back and forth by the force of an external drive mechanism is provided in the nozzle body.
- a fluid passage is provided at the core of the needle valve.
- an actuating bar is connected at right angles to the needle valve.
- a fluid passage is formed in the actuator bar, and the fluid passage in the needle valve is connected to the fluid passage.
- the fluid passage in the actuator is provided with a supply-side check valve and a discharge-side check valve on both sides of the connection portion with the fluid passage in the needle valve. .
- the check valve on the supply side is connected to the fluid source, while the check valve on the discharge side is also connected to the fluid source.
- the check valve on the supply side is opened by the pressure from the fluid source side and is closed by the pressure from the needle valve side.
- the check valve on the discharge side is pressed by a panel provided on the fluid source side, and by adjusting the pressing force of the panel, the pressure on the dollar valve side is a constant value. When it is higher than this, it is opened to allow fluid flow from the needle valve side to the fluid source side.
- the check valve on the supply side is opened by the fluid pressure from the fluid source side. Then, the fluid is allowed to pass through, and the fluid is pressed into the mold cavity.
- the check valve on the discharge side is installed on the fluid source side. While the pressing force of the applied panel and the fluid pressure from the fluid source are applied, the pressure of the fluid that has passed through the check valve on the supply side is applied to the needle valve side, and the needle valve is connected to the fluid source side. It remains closed because the pressures on the sides are almost equal.
- the fluid when the fluid is collected or discharged from the mold cavity, by stopping the supply of the fluid from the fluid source, the fluid can be collected or discharged from the mold cavity.
- the check valve on the supply side is closed by being pressed by the fluid pressure to flow back from the mold cavity.
- the check valve on the discharge side is driven by the fluid pressure flowing back from the mold cavity, and the pressure on the needle valve is reduced by the pressure of the panel provided on the fluid source side. As the pressure rises, the difference becomes higher than a certain pressure, and it is released, allowing the backflow of fluid from the mold cavity.
- the present invention has been made in view of the above-described problems of the conventional injection molding nozzle device, and prevents the fluid press-fitted into the mold cavity from being clogged by the synthetic resin and its debris flowing backward.
- the purpose of the present invention is to enable the fluid pressure in the mold cavity to be controlled over a wide range of times at the same time as the fluid can be collected or discharged through a fluid passage of a different structure.
- the above object can be achieved by providing a means for arbitrarily opening and closing a passage for discharging a fluid press-fitted into a molten resin in a mold cavity.
- a resin passage communicating from the nozzle body opening at the tip of the nozzle body to the ejection cylinder and the inside of the nozzle body are installed so as to be able to move back and forth in the axial direction.
- An operating valve having an operating valve opening at a position substantially coincident with the nozzle body opening, a fluid passage inside the operating valve communicating with the nozzle body opening via a check valve, and opening when discharging the fluid
- An injection-molding nozzle device characterized by having a fluid discharge opening / closing means.
- the fluid passage can be simply configured without bending the fluid passage, and the injection of the molten resin, the injection of the fluid, The discharge and recovery of fluid from the cavity inside the mold cavity can be freely performed at a predetermined timing, and a good molded product can be manufactured. Reuse can be achieved efficiently.
- FIG. 1 is an example of an injection molding nozzle device according to the present invention.
- the injection cylinder 1 contains a screw 2 inside, and the discharge end of the injection cylinder 1 is connected to an adapter 3 for connecting an injection molding nozzle device 25 and an adapter 3.
- the injection molding nozzle device 25 is installed.
- the injection-molded nozzle device 25 includes the nozzle body 4 and the tip end 26 of the nozzle body, the head 16, the support member 4 a and its surroundings, and all parts mounted inside. .
- a nozzle body opening 28 is provided in the center of the tip of the nozzle body tip 26.
- the nozzle body opening 28 is formed at the tip of the head part 16 when the tip part 26 of the nozzle engages with the head part 16. It is in the position which almost matches. .
- the head part 16 is an end wall part that constitutes the tip part of the injection molding nozzle device 25, and corresponds to the injection port of the mold 21. It has an opening 29, is connected to the tip end 26 of the nozzle body via a compressed panel 15, and is movable in the axial direction at the periphery of the tip end 26 of the nozzle body.
- the panel 15 has a function of pushing the head 16 in the direction of the sprue bush 20 of the mold 21.
- the head part supporting part 13 is for preventing the head part 16 from dropping from the tip end part 26 of the nozzle body, and the head 15 is compressed by the spring 15. It does not prevent the movement of Part 16.
- the movement of the head portion 16 is performed by the compression panel pressure, but the injection molding nozzle device 25 is used.
- the head section 16 may be driven by an external drive mechanism such as a piston cylinder outside the housing.
- the operating valve 31 composed of the operating valve support 5 and the operating valve tip 14 has an operating valve opening 27 at the end, and is slidingly inserted into the nozzle body 4 and the nozzle body tip 26. Then, power from a drive source (not shown) is transmitted to the levers 8a and 8b, and the fulcrum 8c provided on the lever 8a moves in the axial direction of the injection molding nozzle device 25. Can be moved.
- the resin passage 12 passes between the tip end 26 of the nozzle body and the operating valve 31, opens the nozzle body 28, passes through the head opening 29, and passes through the mold 21. You can contact the inlet.
- the pressure contact surface of the operating valve tip 1.4 comes into pressure contact with the center of the inner wall of the nozzle body tip 26, as the resin valve 12 advances in the mold 21 direction.
- the communication between the resin passageway 12 and the injection port of the mold 21 is cut off by the operating valve tip portion 14 and closed.
- the operation valve 31 is retracted and communicated and opened.
- the fluid passage 10 inside the operation valve 31 communicates with the injection port of the mold 21 with the check valve 11 interposed therebetween, and communicates with the pressurized fluid flow passage 9 which communicates with a fluid source (not shown). are doing.
- the check valve 11 opens and closes the fluid passage 10 when a pressure difference is generated in the fluid between the injection port of the mold 21 and the fluid passage 10. That is, if the fluid pressure in the fluid passage 10 is higher than the fluid or molten resin pressure on the injection port side of the mold 21, the fluid path 10 opens on the injection port side of the mold 21, and vice versa. Close this, the fluid passage Cut off the communication between 10 and the injection port of mold 21.
- the fluid discharge passage 17 is formed in the tip end portion 26 of the nozzle body, and communicates with a low-pressure fluid passage 19 that communicates with a low-pressure fluid source (not shown).
- the fluid discharge passage 17 is opened / closed by a fluid discharge opening / closing means composed of a helical j, a dowel portion 16 and a nozzle body 4. That is, the inner wall of the head part 16 and the outer wall of the tip end part 26 of the nozzle body are closed by being pressed against each other, and the head part 16 and the nozzle are closed by being pressed. It communicates with the head opening 29 via a gap between the body tip 26.
- the fluid discharge passage 17 is formed in the tip end portion 26 of the nozzle body, but is opened to the head portion 16 on the outer peripheral side from the pressure contact surface between the head portion 16 and the nozzle body. And may communicate with a low pressure fluid source. Further, the fluid discharge passage 17 and the rear part of the check valve 11 may be connected in the injection molding nozzle device 25.
- an operating valve 31 comprising an operating valve support 5 and an operating valve tip 14, a head 16, a nozzle body 4, and a nozzle tip 2
- Figure 2A shows the positional relationship between 6 and.
- a line 22 is a press-contact surface when the head 16 is engaged with the spool bush 20 of the mold 21 not shown.
- Injection cylinder 1 not shown (Fig. 1
- the nozzle body 4 moves forward in the direction of the mold 21 (see Fig. 1), which is not shown in the figure, the nozzle body 4 connected to the injection cylinder 1 also advances at the same time, and the head section. 16 presses against the sprue bush 20 (see Fig.
- the operating valve 31 is retracted on the axis of the nozzle body 4 in the direction opposite to the mold by a driving source (not shown), and the resin passage 12 is opened, and the mold 2 is opened. Communicates with inlet 1
- the screw 2 (see FIG. 1) of the injection cylinder 1 (not shown) advances to fill the mold 21 with the fusion resin. .
- the pressure of the molten synthetic resin in the resin passage 12 increases due to the filling pressure, the communication between the resin passage 12 and the fluid passage 10 is cut off by the check valve 11. This prevents the molten synthetic resin from leaking into the fluid passage 10.
- FIG. 2 B Pressurized fluid injection process
- the operating valve 31 advances in the direction of the mold 21, and the pressure contact surface at the tip of the operating valve 31 contacts the center of the inner wall of the nozzle body 4, and the pressurized fluid is not illustrated in the mold.
- Figure 2B shows the process of injecting into 2. In other words, FIG. 2B does not show the resin passage 12 due to the fact that the tip of the actuation valve 31 engages with and presses against the center of the inner wall of the nozzle body 4. Communication with the injection port of mold 21 has been shut off.
- the operating valve 31 advances in the mold direction, and the pressure contact surface 30 at the tip of the operating valve 31 contacts the center of the inner wall of the nozzle body 4.
- the advancement of the operating valve 31 is stopped, and the communication between the resin passage 12 and the injection port of the mold 21 is stopped without interrupting the resin passage 12 at the end of the operating valve 31. If the pressure of the molten resin in the mold and the pressure of the pressurized fluid are adjusted appropriately while keeping the state, the resin and the pressurized fluid can be almost simultaneously filled and injected into the mold. It is possible.
- FIG. 2C After the injection of the pressurized fluid into the molten synthetic resin in the mold 21 at the stage shown in Fig. 2B, the press-contact surface at the tip of the operating valve 31 is brought into contact with the center of the inner wall of the nozzle body 4. While maintaining the pressure contact state, the nozzle body 4 is pressed to the extent that the pressure of the sprue bush of the mold 21 by the compression spring 15 of the head portion 16 against the pressure contact surface 22 of the bush is not lost. When retracted, a gap 18 is created between the outer wall of the nozzle body 4 and the inner wall of the head section 16, and through the gap 18, the injection port of the mold 21 and the fluid discharge passage 17 are formed. Communicate.
- the pressurized fluid injected into the molten synthetic resin in the mold 21 is empty from the injection port of the mold 21.
- the liquid After passing through the I 3 gap 18 and the fluid discharge passage 17, the liquid is recovered to a low-pressure fluid source (not shown) through the low-pressure fluid flow path 19, and can be reused. It is also possible to press the outer wall of the nozzle body 4 and the inner wall of the head 16 again while the pressurized fluid is being discharged, and hold the nozzle body 4 at a reduced pressure.
- the injection molding nozzle device 25 of the first embodiment includes a fluid passage 10 through which the pressurized fluid is injected into the mold 21, and a pressurized fluid injected into the mold 21 by the injection molding nozzle. Since the fluid discharge passage 17 returning to the device 25 side is different, and the distance of the fluid discharge passage 17 is short, the pressure resistance received by the pressurized fluid becomes small, and the recovery time of the pressurized fluid is reduced. It will be shorter.
- the tip of the nozzle body 4 does not engage with the injection port of the mold 21 with the head portion 16 interposed therebetween as shown in FIG. 1, but directly engages the mold 21.
- the same function can be exerted by the head portion 16 which is devised so as to be able to press-contact and engage with the injection port.
- the sprung bush 2 of the mold 21 is compressed by the compression panel 15 of the head 16.
- the injection cylinder 1 is retracted within a range in which the pressure to 0 is not lost, the nozzle body tip 26 also retracts, and the outer wall of the nozzle body tip 26 and the sprue of the mold 21 are removed.
- a void 18 is formed, which is surrounded by a part of the inner wall of the bush 20 and the head 16, and the inlet of the mold 21 communicates with the fluid discharge passage 17 through the void 18. I do.
- the pressurized fluid injected into the molten synthetic resin in the mold 21 passes through the cavity 18 and the fluid discharge passage 17 from the injection port of the mold 21 to the low-pressure fluid.
- the flow path 19 it is possible to recover the liquid to a low-pressure fluid source (not shown).
- the injection molding nozzle device 25 having the same function as the head portion 16 in FIG. 1 is provided. Is possible.
- the head opening is wide because the head opening is wide.
- the gap 18 can be easily cleaned without removing the gap 16.
- each of the first and second embodiments is press-welded to the blue bush 20 of the die 21, but the die 2 other than the blue bus 20 is used.
- An injection molding nozzle device having the same function can be provided even if it is brought into pressure contact with a part of the injection molding nozzle.
- the injection molding nozzle device 25 of the present embodiment has a nozzle tip portion.
- It is composed of a nozzle body 4 provided with 26 and a valve body.
- the nozzle body 4 is attached to the injection cylinder 1 and receives the molten synthetic resin of the injection cylinder 1 from the rear end of the resin passage 12.
- the tip end 26 of the nozzle body is pressed against the mold 21, and the front of the resin passage 12 and the resin passage 12 passes through the nozzle body opening 28, and the sprue bush of the mold 21 is pressed.
- the resin passage 12 is provided between the core of the nozzle body 4 (the sliding portion of the operating valve 31) and the outer periphery.
- the valve body is built in the nozzle body 4, and an operating valve 31 built in the nozzle body 4 so as to be slidable in the axial direction, and an operating valve 31 built in the operating valve 31 so as to be slidable in the axial direction.
- the operating valve 3 1 moves forward and the tip of the nozzle body
- the front part of the resin passage 12 is closed by pressing the inner wall of the cylinder 6 and the outer wall of the tip of the operating valve 3 1, and the resin passage 12 is closed by retreating to release the above-mentioned pressure contact.
- the front of is opened.
- the fluid passage 10 inside the operating valve 31 opens forward and is closed when pressed backward.
- the pressurized fluid flows to the fluid source (not shown) via the check valve 11.
- the fluid passage 9 communicates with the two-hole valve opening 33, and the operating valve 31 and the two-hole valve are connected.
- the check valve 11 may be provided with a spring for pressing the backflow preventing ball backward.
- the fluid discharge passage 17 is a groove or an annular groove formed between the inner wall of the core of the operation valve 31 and the outer periphery of the needle valve 32, and is connected at the rear of the check valve 11.
- the passage 17a is connected to the fluid passage 10 so that the pressurized fluid can be recovered.
- the fluid discharge passage 17 is closed by the advancement of the needle valve 32, which is a fluid discharge opening / closing means, to press the inner wall of the operating valve 31 and the outer wall of the distal end of the needle valve 32 into contact. It is released by retreating and releasing the aforementioned pressure contact.
- the fluid discharge passage 17 is closed by the inner wall of the operating valve 31.
- the needle valve 32 may be formed inside the needle valve 32 at the position where the chain is linked.
- the operating valve 31 and the needle valve 32 are located at positions corresponding to the spider opening of the nozzle body 4, and the lever receiving grooves for receiving the levers 6 a and 7 a respectively receiving the force of the external drive mechanism are inserted therein. It has 6c and 7c, and moves forward and backward independently at the fulcrums 6d and 7d of the levers 6a and 7a by the force of the external drive mechanism.
- the external drive mechanism a known hydraulic or pneumatic actuator (not shown) is used as the external drive mechanism. The force of the external drive mechanism is transmitted to the levers 6a and 7a by the connecting rods 6b and 7b and the connecting pins 6e and 7e, respectively.
- the check valve 11 prevents backflow of the molten synthetic resin into the fluid passage 10 and the fluid discharge passage 17 is closed because the fluid discharge passage 17 is closed. Backflow is also prevented.
- the needle valve 32 and the operating valve 31 are kept in pressure contact with the operating valve 31 forward, and the resin passage 12 is closed at the inlet of the nozzle body opening 28.
- a pressurized fluid is supplied from a pressurized fluid source.
- the pressurized fluid passes through the pressurized fluid flow passage 9, flows through the fluid passage 10, the check valve 11, the needle valve opening 33, the operating valve opening 27, and the nozzle body opening 28, and Through the sprue bush 20 of the mold 21, the core of the molten synthetic resin injected into the mold cavity 21 a of the mold 21 or the core of the portion where the thickness is increased.
- the molten synthetic resin is injected into the part and forms a hollow part by the pressurized fluid, while the molten synthetic resin is flushed toward the flow end of the mold cavity 21a, and the synthetic resin around the hollow part is molded into the mold cavity. Press against the inner wall of 21a.
- the supply of fluid from the pressurized fluid source is stopped, or after leaving for a certain period of time, the operating valve 31 is kept in the forward position, and the dollar valve 32 is turned on. Retract and release the pressure contact between the inner wall of the tip of the operating valve 31 and the outer wall of the tip of the needle valve 32.
- the nozzle body opening 28 is closed by the operating valve opening 27.
- the needle valve 32 is moved forward again. Then, the pressure of the fluid in the mold cavity 21a can be maintained at the lowered set pressure.
- the synthetic resin having a hollow portion in the core is press-fitted into the cavity 21a of the mold 21 and solidified in the mold cavity 21a and then re-kneaded.
- the dollar valve 32 is retracted, the fluid discharge passage 17 is opened, and the residual pressurized fluid is discharged to the atmosphere from between the pressurized fluid source and collected in the collection container.
- the injection cylinder 1 is retracted to release the pressure contact between the subroutine 20 of the mold 21 and the tip end 26 of the nozzle body, and the fluid in the mold cavity 21a is released. Releases residual pressure into the atmosphere.
- the plasticization measurement of the synthetic resin for the next molding process is performed after the injection of the molten synthetic resin is completed by the injection molding nozzle device.
- the injection molding nozzle device 25 of this embodiment includes a nozzle body 4, a nozzle body tip 26, and an operating valve 31.
- the nozzle body 4 is attached to an injection cylinder (not shown) as in the third embodiment, and has a resin passage 12 of the same structure.
- the operating valve 31 is arranged inside the nozzle body 4 so as to be able to move back and forth, and opens and closes the resin passage 12 by the forward and backward movement as in the third embodiment. Further, a fluid passage 10 is provided at the center of the operating valve 31 via a check valve 11 and connected to the operating valve opening 27 at the tip end.
- the check valve 11 provided in the fluid passage 10 is closed so that the molten synthetic resin does not enter the fluid passage 10 and the pressurized fluid flow passage 9 when the molten synthetic resin is injected.
- a check valve release pin 7 is provided. When discharging the pressurized fluid in the mold cavity (not shown), the check valve release pin 7 is advanced to push the check valve prevention ball of the check valve 11 forward. Open check valve 1 1.
- Lever 6a and 7a are provided for the forward and backward movement of the operating valve 31 and the check valve release pin 7, respectively.
- the nozzle body 4 is pressed against a mold (not shown), the operating valve 31 is moved backward, the tip of the operating valve 31 is separated from the inner wall of the nozzle body tip 26, and the resin passage 1 is moved. Release 2.
- a screw (not shown) is advanced, and a pre-metered molten synthetic resin is injected through a resin passage 12 into a mold cavity (not shown) through a nozzle body opening 28. I do.
- the operating valve 31 is advanced to close the resin passage 12.
- the on-off valve (not shown) between the pressurized fluid source (not shown) and the pressurized fluid flow passage 9 is opened to supply the pressurized fluid to the fluid passage 10 via the pressurized fluid flow passage 9. Then, it is injected into the mold cavity (not shown) through the valve opening 27 and the nozzle opening 28 via the check valve 11.
- the on-off valve (not shown) is closed and the supply of the pressurized fluid is stopped.
- the injected pressurized fluid is formed in the synthetic resin in the mold cavity from the check valve 11 in the fluid passage 10. Between the open hollows.
- the injection of the pressurized fluid may be started during the injection of the molten synthetic resin, at the same time as the completion of the injection, or after a certain time after the completion of the injection.
- the pressure of the pressurized fluid is reduced from the molten synthetic resin pressure while the operating valve 31 is in the retracted position and the resin passage 12 is open. Is also adjusted to a high level.
- the check valve release pin 7 is advanced, and the check valve 11 in the fluid passage 10 is used to prevent the check valve 11 from flowing back. Push forward to open check valve 1 1.
- the pressurized fluid in the hollow formed in the synthetic resin in the mold cavity (not shown) is passed through the nozzle body opening ⁇ 28 and the operating valve opening ⁇ 27.
- the fluid passes through the fluid passage 10 and is discharged from the pressurized fluid passage 9.
- the injection molding nozzle device 25 of this embodiment includes a nozzle body 4, a nozzle body tip 26, and an operating valve 31. .
- the nozzle body 4 is attached to the injection cylinder 1 (not shown) and has a resin passage 12 of the same structure as in the above embodiment.
- the operating valve 31 is arranged inside the nozzle body 4 so as to be able to move back and forth, and opens and closes the resin passage 12 by the forward and backward movement as in the above embodiment. Further, a needle valve 32 having a fluid passage 10 in the center thereof is provided at the center of the operating valve 31 so as to be able to move back and forth, and further, a reverse flow is provided at the tip of the needle valve 32.
- the prevention valve element 32 b is provided integrally with the needle valve 32. Several protrusions are provided radially at the tip of the backflow prevention valve body 32b, and a passage is formed between them.
- the backflow prevention valve element 32 b is moved between the fluid passage 31 a and the fluid passage 10 between the fluid valve 31 and the inner wall of the operating valve 31 by the forward and backward movement of the needle valve 32.
- the valve is opened and closed by being pressed against or separated from the valve seat 33.
- a panel 32a is provided at the rear of the needle valve 32, and presses the needle valve 32 backward.
- the rear end of the needle valve 32 is in contact with the drive lever 7a in order to transmit the forward movement to the needle valve 32.
- drive levers 6a and 7a are provided for the front and rear operation of the operating valve 31 and the needle valve 32, respectively.
- the nozzle body 4 is pressed against a mold (not shown), the operating valve 31 is retracted, and the tip of the operating valve 31 is connected to the tip end of the nozzle body 26. Open the resin passage 12 away from the inner wall of Z4. A screw (not shown) is advanced, and a pre-measured molten synthetic resin passes through the resin passage 12 and is opened through a nozzle body 28 to form a mold (not shown). Inject into At this time, the backflow preventing valve body 32b is pressed against the valve seat 33 by the panel 32a to prevent the molten synthetic resin from entering the fluid passage 10.
- the operating valve 31 is advanced to close the resin passage 12.
- the on-off valve (not shown) between the pressurized fluid source (not shown) and the pressurized fluid flow path 9 is opened to supply the pressurized fluid to the fluid passage 10 through the pressurized fluid flow path 9. .
- the rear end of the 21-dual valve 32 is pushed forward to advance the needle valve 32, to open the backflow prevention valve 32b, and to operate the fluid of the operating valve 31.
- a pressurized fluid is injected into the mold cavity (not shown) through the passage 31a and the nozzle body opening 28.
- the on-off valve (not shown) is closed and the supply of the pressurized fluid is stopped.
- the pressing force at the rear end of the needle valve 32 is released, and the pressing force of the panel 32a retreats the needle valve 32 to move the backflow preventing valve element 32b. close.
- the injected pressurized fluid is held in the hollow formed in the synthetic resin in the mold cavity from the backflow prevention valve 32b.
- the rear end of the needle valve 32 is pressed forward again, and the needle valve 32 is advanced to reverse flow. Release prevention valve 3 2 b.
- the pressurized fluid in the hollow portion formed in the synthetic resin in the mold cavity (not shown) passes through the nozzle body opening 28 and the fluid passage 31a.
- the fluid passes through the fluid passage 10 and is discharged from the pressurized fluid passage 9.
- the injection molding nozzle device of the present invention has the following effects.
- the injection molding nozzle apparatus of the present injection molding nozzle apparatus After forming a hollow part by the pressurized fluid by injecting the pressurized fluid at the same time as the injection of the molten synthetic resin or after the injection of the molten synthetic resin, the injection molding nozzle apparatus of the present injection molding nozzle apparatus is used. From the check valve of the fluid passage, the shape is formed on the synthetic resin core in the mold cavity. The pressurized fluid contained in the space formed up to the hollow portion formed is opened by opening the fluid discharge passage or the check valve for a necessary time, and only the necessary pressurized fluid is caused to flow back. In other words, the holding pressure of the pressurized fluid in the hollow formed in the core of the synthetic resin in the mold cavity can be controlled to the set pressure.
- the check valve can be provided at an arbitrary position in the fluid passage, so that the length of the fluid passage located on the tip side of the check valve can be shortened and the fluid passage is formed linearly.
- the check valve can be provided at an arbitrary position in the fluid passage, so that the length of the fluid passage located on the tip side of the check valve can be shortened and the fluid passage is formed linearly.
- the molten synthetic resin and the pressurized fluid are pressed into the mold cavity to form a hollow in the core of the molten synthetic resin in the mold cavity, and then the mold key is passed through the check valve in the fluid passage.
- Yaw The pressurized fluid sealed in the space up to the hollow formed in the core of the molten synthetic resin inside is gradually backflowed in the same manner as described above, and the pressure of the fluid in the hollow is reduced. Can be controlled. By gradually lowering the pressure of the fluid in the hollow part to the atmospheric pressure in accordance with the progress of cooling the molten synthetic resin in the mold cavity.
- the screw is retracted, and the compressed volume of the injected molten synthetic resin is caused to flow back to the cylinder side (suck back).
- the pressure of the molten resin at the injection port of the mold is reduced, and the operation of injecting the pressurized fluid at a lower pressure is enabled.
- FIG. 1 is a sectional view showing a first embodiment of an injection molding nozzle device according to the present invention
- FIGS. 2A to 2C are explanatory views of the operation of a head portion and an operation valve
- FIG. Fig. 4 is a cross-sectional view showing the second embodiment
- Fig. 4 is a cross-sectional view showing the third embodiment
- Figs. 5A to 5C are explanatory diagrams of the operation of the operating valve and the needle valve
- Fig. 6 is a fourth embodiment.
- FIG. 7 is a sectional view showing an example
- FIG. 7 is a sectional view showing a fifth example.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69114258T DE69114258T2 (de) | 1990-08-03 | 1991-08-01 | Düsevorrichtung zum spritzgiessen. |
EP91913822A EP0495126B1 (en) | 1990-08-03 | 1991-08-01 | Nozzle device for injection molding |
KR1019920700762A KR950009716B1 (ko) | 1990-08-03 | 1991-08-01 | 사출 성형 노즐장치 |
US08/239,852 US5374181A (en) | 1990-08-03 | 1991-08-01 | Injection molding nozzle device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2/205096 | 1990-08-03 | ||
JP2205096A JPH0720640B2 (ja) | 1990-08-03 | 1990-08-03 | 射出成形ノズル装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992002350A1 true WO1992002350A1 (fr) | 1992-02-20 |
Family
ID=16501361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1991/001032 WO1992002350A1 (fr) | 1990-08-03 | 1991-08-01 | Dispositif a buse pour moulage et par injection |
Country Status (7)
Country | Link |
---|---|
US (1) | US5374181A (ja) |
EP (1) | EP0495126B1 (ja) |
JP (1) | JPH0720640B2 (ja) |
KR (1) | KR950009716B1 (ja) |
CA (1) | CA2067362C (ja) |
DE (1) | DE69114258T2 (ja) |
WO (1) | WO1992002350A1 (ja) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR970011562B1 (ko) * | 1994-04-09 | 1997-07-12 | 엘지전자 주식회사 | 가스 주입을 이용한 이종 수지물의 사출성형 장치 및 방법 |
WO1999037460A1 (en) * | 1998-01-27 | 1999-07-29 | Makoto Yamaguchi | Vented method for injection molding |
US6558148B1 (en) * | 2000-10-23 | 2003-05-06 | Incoe Corporation | Gas valve pin mechanism |
PL2111303T3 (pl) * | 2007-01-26 | 2015-04-30 | Haas Mondomix B V | Urządzenie i sposób dozowania spienionych mas |
KR101441181B1 (ko) * | 2012-05-31 | 2014-09-18 | 주상규 | 수지 공급노즐용 니들 |
CN108081551B (zh) * | 2016-11-21 | 2024-01-30 | 柳道万和(苏州)热流道系统有限公司 | 热流道系统 |
WO2018143291A1 (ja) * | 2017-01-31 | 2018-08-09 | 住友重機械工業株式会社 | 射出成形機 |
JP7193376B2 (ja) * | 2019-02-22 | 2022-12-20 | Towa株式会社 | 樹脂成型装置及び樹脂成型品の製造方法 |
EP3965956A1 (de) * | 2019-05-10 | 2022-03-16 | ATN Hölzel GmbH | Verfahren und applikator zur kontinuierlichen sequenziellen applikation von zwei oder mehr viskosen materialien oder fluiden |
CN116653212B (zh) * | 2023-05-30 | 2024-04-19 | 浙江恒道科技股份有限公司 | 一种应用于光导的一体式嘴芯结构 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5949902B2 (ja) * | 1978-07-10 | 1984-12-05 | 旭化成株式会社 | 同時射出防止ノズル装置 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2940123A (en) * | 1957-07-17 | 1960-06-14 | Basf Ag | Shut-off nozzle for injection molding of thermoplastic materials |
DE2346135C2 (de) * | 1973-09-13 | 1982-11-04 | Battenfeld Maschinenfabriken Gmbh, 5882 Meinerzhagen | Verfahren und Vorrichtung zum Spritzgießen von Kunststofformkörpern, die aus einer Füllschicht aus einem thermoplastischen Kunststoff und aus einer diese einschließenden Deckschicht aus einem anderen thermoplastischen Kunststoff bestehen |
JPS51119063A (en) * | 1975-04-11 | 1976-10-19 | Asahi Dow Ltd | Injection molding machine |
JPS53102960A (en) * | 1977-02-21 | 1978-09-07 | Asahi Chem Ind Co Ltd | Injection mold |
JPS5949902A (ja) * | 1982-09-14 | 1984-03-22 | 松下電工株式会社 | 電池式丸鋸 |
US4781554A (en) * | 1987-07-09 | 1988-11-01 | Michael Ladney | Apparatus for the injection molding of thermoplastics |
US4944910A (en) * | 1987-07-09 | 1990-07-31 | Michael Ladney | Method of molding thermoplastic material |
US4942006A (en) * | 1988-12-01 | 1990-07-17 | Michael Ladney | Method of and apparatus for injection molding with pressurized-fluid assist |
EP0321160B2 (en) * | 1987-12-16 | 2000-08-02 | Melea Limited | Injection molding method and nozzle for use therein |
CA1292849C (en) * | 1989-07-14 | 1991-12-10 | Harald Hans Schmidt | Pneumatic actuating mechanism for injection molding |
US5080570A (en) * | 1990-03-14 | 1992-01-14 | Nitrojection Corporation | Miniaturized for gas-assisted injection molding |
-
1990
- 1990-08-03 JP JP2205096A patent/JPH0720640B2/ja not_active Expired - Lifetime
-
1991
- 1991-08-01 CA CA002067362A patent/CA2067362C/en not_active Expired - Fee Related
- 1991-08-01 US US08/239,852 patent/US5374181A/en not_active Expired - Lifetime
- 1991-08-01 KR KR1019920700762A patent/KR950009716B1/ko not_active IP Right Cessation
- 1991-08-01 WO PCT/JP1991/001032 patent/WO1992002350A1/ja active IP Right Grant
- 1991-08-01 EP EP91913822A patent/EP0495126B1/en not_active Expired - Lifetime
- 1991-08-01 DE DE69114258T patent/DE69114258T2/de not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5949902B2 (ja) * | 1978-07-10 | 1984-12-05 | 旭化成株式会社 | 同時射出防止ノズル装置 |
Also Published As
Publication number | Publication date |
---|---|
EP0495126B1 (en) | 1995-11-02 |
DE69114258D1 (de) | 1995-12-07 |
KR920702279A (ko) | 1992-09-03 |
CA2067362A1 (en) | 1992-02-04 |
EP0495126A4 (en) | 1993-03-31 |
JPH0490315A (ja) | 1992-03-24 |
JPH0720640B2 (ja) | 1995-03-08 |
US5374181A (en) | 1994-12-20 |
CA2067362C (en) | 1997-04-22 |
KR950009716B1 (ko) | 1995-08-26 |
DE69114258T2 (de) | 1996-07-04 |
EP0495126A1 (en) | 1992-07-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP3118645B2 (ja) | 射出成形品のガス援用射出成形方法および装置 | |
US5204050A (en) | Gas assisted injection molding | |
JP2008529824A (ja) | 可動プラテンによる射出動作(actuation)及び突出し動作を用いる射出成形機装置及び方法 | |
EP1189739B1 (en) | Injection nozzle and method for injection molding | |
WO1992002350A1 (fr) | Dispositif a buse pour moulage et par injection | |
JP3536492B2 (ja) | 射出成形用金型及び当該金型を用いた射出成形方法 | |
JP2807619B2 (ja) | 樹脂成形機 | |
US20080274224A1 (en) | Precompression Pin Shut Off with Suckback | |
JPS62151258A (ja) | 金型のガス抜き装置 | |
JPH11156902A (ja) | 射出成形機および射出成形方法 | |
JP2936282B2 (ja) | ノズル装置 | |
JPH05131498A (ja) | 射出成形ノズル | |
JP2008221656A (ja) | 樹脂成形品の製造方法及び樹脂成形装置 | |
JPH08336865A (ja) | 射出成形金型のゲート封止機構 | |
JPH0815752B2 (ja) | プリプラ式射出成形機 | |
JP7226363B2 (ja) | 射出成形方法 | |
JP3047299B2 (ja) | 中空射出成形体の成形方法 | |
KR100462700B1 (ko) | 사출성형장치및사출성형방법 | |
JPH01118421A (ja) | 射出成形用金型 | |
JPS5889334A (ja) | 射出成形用金型 | |
JP2002307155A (ja) | 金属射出成形用金型 | |
JP2677907B2 (ja) | バルブ式ノズル | |
JP2001158028A (ja) | 射出成形機用アダプタ、射出成形機、及び射出成形方法 | |
JP2002210778A (ja) | 半導体用射出成形装置及び半導体装置 | |
JP3007850B2 (ja) | 樹脂成形方法及び樹脂成形装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CA KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): CH DE FR GB IT NL |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1991913822 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2067362 Country of ref document: CA |
|
WWP | Wipo information: published in national office |
Ref document number: 1991913822 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 1991913822 Country of ref document: EP |