• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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  • 优先权
    • 专利摘要:
    There is provided a screw device (3) for an injection molding machine (1) in which an inner part of a heating cylinder (2) is introduced into a high pressure region (9) on an upstream side where an inert gas is introduced, and a low pressure region (30) on a downstream side where the inert gas is outgassed is partitioned by a seal structure (27) disposed in the scroll device (3), and a decompression release section (35) is disposed on a downstream side of the seal structure (27) in the scroll device (3). A multi-flight flight of at least two flights forms the decompression release section (35) in which deep groove sections with a deep flight groove and flat groove sections (38) with a flat flight groove are formed respectively at two or more locations in at least one axial direction. The inert gas exits on a downstream side of the decompression release portion (35).
    公开号:AT517284A1
    申请号:T9080/2015
    申请日:2015-03-04
    公开日:2016-12-15
    发明作者:Hiromasa UEZONO；Atsushi Yusa
    申请人:Japan Steel Works Ltd；Hitachi Maxell；
    IPC主号:
    专利说明:

    • · ·. ». J ····; ·
    Technical Field ......... * ·· * [0001]
    The present invention relates to a screw device for an injection molding machine in which an inner part of a heating cylinder is divided into a high-pressure region on an upstream side and a low-pressure region on a downstream side by a seal structure disposed at a predetermined position of the screw device for an injection molding machine. wherein an inert gas is introduced into a molten resin in the high-pressure region and can outgas the inert gas in the low-pressure region. State of the art [0002]
    When electroless plating is performed on a molded plastic product made by injection molding, a costly pretreatment process, such as outgassing, etching, wetting, with catalyst, and accelerator for the potted product, is to modify a surface of the potted product and a plating treatment is performed after the surface modification. A hazardous substance is used in this pretreatment process, and therefore, this pretreatment process results in problems of wasting liquid processing agents, increasing the number of processes, and increasing the cost. In recent years, an injection method has been proposed by which a surface-modified potted product is obtained by injection molding alone, so that electroless plating can be carried out even if the pretreatment process is omitted. In particular, the process is to obtain the product produced by potting by injecting molten resin to which a surface-modifying material, such as a metal complex, is added, and the product obtained by * * Infused product is in a surface-modified state. In this method, a small amount of the surface-modifying material is added to the molten resin, and therefore, an inert gas in a supercritical state is also introduced into a heating cylinder of an injection molding machine so that the surface-modifying material uniformly penetrates and disperses into the molten resin. After the surface-modifying material uniformly enters and distributes into the molten resin, the inert gas in the heating cylinder is exhausted. The molten resin thus obtained and subjected to the process of uniformly penetrating and spreading the surface-modifying material is injected into a mold. A screw device and an injection molding machine suitable for this injection method are disclosed in PTL 1 and PTL 2.
    quote list
    Patent Literature [PTL 1] Japanese Patent No. 4804557 [PTL 2] Japanese Patent No. 4939623 [0004]
    In the screw device and the injection molding machine each disclosed in PTL 1, and the screw device and the injection molding machine respectively disclosed in PTL 2, a seal structure having a seal and a predetermined flow control mechanism is disposed at a predetermined position of the screw device , And an inner part of a heating cylinder is divided by this seal into two areas. The worm device disclosed in PTL 1 and the worm device disclosed in PTL 2 ············ differs only slightly from each other in terms of the structure of the flow control mechanism, and effects of The screw device disclosed in PTL 1 and the screw device disclosed in PTL 2 are almost identical to each other. The screw device disclosed in PTL 1 and the screw device disclosed in PTL 2 do not differ from each other when the structure except the flow control mechanism is considered. A screw device 51 and an injection molding machine 50 disclosed in PTL 1 will be described in a simplified manner with reference to FIG. The screw device 51 is disposed in a heating cylinder 53, and is capable of being moved in a rotational direction and in an axial direction. A seal 54 is disposed on an outer circumferential surface at a predetermined position of the screw device 51. A seal unit 52 having a shallow helical groove exhibiting a sealing effect is formed on the upstream side of the screw device 51. Due to this seal 54 and the seal unit 52, a first area 55 is formed on the back side of an inner part of the heating cylinder 53, i. on an upstream side. A second area 56 is formed in the front area, i. on a downstream side. A flow control mechanism 58 is disposed in an inner part of the screw device 51 in the vicinity of the seal 54. A communication passage that allows communication of the first and second regions 55 and 56 with each other and a valve structure that opens and closes the communication passage form the flow-through flow mechanism 58
    Flow-through mechanism 58 maintains the pressure of a molten resin in the first region 55 at a predetermined pressure value. As soon as the pressure exceeds the predetermined pressure, the valve opens and the molten resin flows into the second area 56. This valve structure causes the first area 55 to a high-pressure area and the
    • ··. . * ···· I ······· **, * · · · the second area becomes a low pressure area. Distance* a return flow from the second region 56 is prevented in the first region 55. The screw device 51 has a deeper groove at a predetermined position in the first region 55, and an injection port 59 is disposed on this part in the heating cylinder 53. A supercritical fluid feeder 60 is disposed at the injection port 59. An inert gas, such as carbon dioxide, is placed in a supercritical state by raising the temperature and the pressure, a surface-modifying material is added to the inert gas, and then the inert gas is introduced into the heating cylinder 53. A venting region 62 is disposed at a predetermined portion of the heating cylinder 53 that is responsive to the second region 56 such that the inert gas outgasses when a valve 63 is open.
    [0005]
    This injection molding machine 50 is capable of performing an injection molding operation in the following manner, wherein the surface-modifying material is selected, for example, as a filler material. In other words, a resin material is melted and collected in the first region 55 after the heating cylinder 53 is heated, the screw device 51 is rotated, and the resin material is discharged from a funnel 64 on the
    The inert gas in the supercritical state to which the surface modifying material is added is generated by the supercritical fluid feeder 60, and this inert gas is passed through the supercritical fluid
    Injection port 59 supplied. Subsequently, the liquid state of the molten resin in the first region 55 is increased by the inert gas in the supercritical state, and the surface-modifying material rapidly and uniformly penetrates into the molten resin and disperses. At this time, an inner part of the first region 55 is maintained at high pressure by the flow control mechanism 58, ······················, and the supercritical state of the inert gas becomes heavy and the inert gas does not become the gaseous one Condition offset. Once the pressure of the molten resin in the first region 55 exceeds a predetermined pressure, the valve of the flow control mechanism 58 is opened and the molten resin flows into the second region 56, i. in the low pressure area. After a pressure relief in the second region 56, the inert gas evaporates. The vaporized inert gas can outgas because the valve 63 is open. Subsequently, the molten resin is obtained, wherein the surface-modifying material is uniformly penetrated into the molten resin and distributed. After the molten resin has been detected at a tip of the screw device 51, the screw device 51 is displaced in the axial direction as known in the prior art, and injected into a mold (not shown). A surface-modified potted product is obtained when the mold is opened after cooling and solidification.
    [0006]
    An injection molding machine provided with this screw device is also suitable for foam molding and for applying a physical foaming agent, that is, the inert gas. During the mold foaming, the inert gas is injected into the molten resin below a predetermined pressure so as to achieve the saturation solubility, this molten resin is injected into a cavity in the mold, and the volume of the cavity is increased, with a core inserted into the cavity or wherein the mold is opened by a predetermined amount. Alternatively, a small portion of the molten resin is injected into the cavity. Subsequently, the inert gas in the molten resin foams in the cavity, and a mold-foamed product is obtained. In the foaming of the mold, the inert gas has to be injected into the molten resin to be injected, so · · · φ -. It is recommended that the saturation solubility be precisely achieved in order to achieve product quality without fluctuations. However, it is difficult to measure the introduced inert gas with accuracy and without oversupply or too small amount. When applied in the injection molding machine shown in Fig. 3, the molten resin can be obtained with the inert gas having saturation solubility accurately introduced. In particular, the injection molding machine 50 illustrated in FIG. 3 is modified as follows. First, an inert gas feeder is disposed at the injection port 59 instead of the supercritical fluid feeder 60, and further, the inert gas such as carbon dioxide and nitrogen is allowed to be introduced into the first region 55 under high pressure of 10 MPa or so. A check valve is disposed on the inlet portion 62, the check valve being adjusted to open at a predetermined pressure, about 5 MPa. In this injection molding machine, the inert gas is introduced into the molten resin in the first region 55, which is the high-pressure region, so that the inert gas is slightly excessively present. Then, pressure is reduced to a predetermined pressure in the second region 56, which is the low-pressure region, then the additional inert gas evaporates, and outgassing from the vent region 62 occurs.
    Then, a state is reached in the second region 56, after which the inert gas in the molten resin having saturation solubility is melted below a predetermined pressure. When this is injected, a mold-foamed product of uniform quality is obtained. Overview of the Invention Technical Problem [0007]
    A desired additive, such as a surface-modifying material composed of a metal complex, may penetrate into and be dispersed in the molten resin, and a ·········. Potting-made product having a desired property can be produced by the injection molding machine 50 disclosed in PTL 1 and the injection molding machine disclosed in PTL 2. *** " be obtained in the same way. It can be said that they are excellent in that even with a small added amount, in particular, introducing the inert gas in the supercritical state into the first region makes it possible for the additive to enter and disperse into the molten resin in a more efficient and uniform manner , and the inert gas not required in the second region may appropriately outgas. Further, mold foaming using a physical foaming agent may also be carried out, and a molded foamed product of high quality may be obtained by these injection molding machines. In other words, the injection molding machine provided with the first and second portions does not pose a significant problem in terms of their basic structure. However, there are still some issues that need to be addressed. In particular, these problems include outgassing of the inert gas in the second region. In the injection molding machine disclosed in PTL 1 or PTL 2, the venting area is open to the atmospheric pressure, and therefore, the inert gas rapidly evaporates and exhausts from the venting area in the second area. However, ventilation of the molten resin may occur in the vent area, and this may result in closure of the vent area or outflow to the outside. This is because when the valve structure of the flow control mechanism is open and the high-pressure molten resin flows from the first area into the second area, the pronounced pressure difference causes the molten resin to be pulled intensively toward the vent area. It is also possible that by the pressure of the gas evaporating from the molten resin, the molten resin is extruded. Even in the case that no molten resin from the * ·· * * ·· * ··· * * .. · I · ·
    Venting area, intumescent molten resin in the vent area may result in solidification of the molten resin on that part. Then the efficiency and the quality of outgassing are impaired. When the breather portion is located in a downstream direction in the second range with the maximum possible amount, venting of the molten resin can be prevented. In other words, when the venting portion is located at a position spaced from the gasket 54, the molten resin reaches the venting portion after penetrating the second portion by a predetermined distance, and therefore, the pressure is gradually reduced and the venting or fumigation can be prevented. However, this causes an increase in screw length, an increase in machine length and an increase in cost, and one can not say that this is an effective solution. Cases in which foaming is carried out show the same problem. This is because the second area has a lower pressure than the first area, although a predetermined pressure is maintained in the second area, and therefore, the aeration in the vent area occurs in some cases.
    [0008]
    The object of the present invention is to provide a screw device for an injection molding machine and an injection molding machine, which do not have the problems described above. In particular, the present invention is intended to provide a screw device for an injection molding machine and an injection molding machine in which an inner part of a heating cylinder is divided into a high-pressure region and a low-pressure region by a seal structure disposed in the screw device, introducing an inert gas into the high-pressure region Inert gas in the low-pressure area outgassing and a ventilation or ············································.
    Gas supply in a safe and reliable way can be prevented by the outgassing of the inert gas. Solution to the problem [0009]
    In order to achieve the above-described object of the present invention, the present invention is adapted to address a screw device for an injection molding machine in which a seal structure is provided at a predetermined position, an inner part of a heating cylinder in a high-pressure region on the downstream side and a Lower pressure range on the upstream side is divided by the sealing structure, a molten resin is led into the low-pressure region after an inert gas is introduced into the high pressure region, and outgas the inert gas in the low pressure region. In this screw device according to the present invention is a
    Decompression release portion disposed on a downstream side of the seal structure, wherein shallow groove portions are formed with a shallow Zwischenschraubenganggangnut at two or more locations, and wherein deep groove portions are formed with a deep Zwischenschraubengangnut at two or more locations in at least one axial direction in the decompression release section. Furthermore, a multi-flight thread of at least two threads forms this decompression release section. The present invention is designed such that the inert gas outgates on a downstream side of the decompression release section.
    [0010]
    According to a first invention, in order to achieve the above-described object of the present invention, the first invention is embodied as a screw device for an injection molding machine, which is designed such that an internal part is formed a heating cylinder is divided into a high-pressure region on an upstream side and a low-pressure region on a downstream side by a sealing structure disposed at a predetermined position of the screw device, wherein a molten resin is led into the low-pressure region after an inert gas is introduced into the high-pressure region, and venting the inert gas in the low pressure region, wherein in the screw means a predetermined decompression release portion is disposed on a downstream side of the seal structure, wherein deep groove portions having a deep
    Zwischenschraubengangnut formed at two or more locations, and shallow groove portions with a flat Zwischenschraubengangnut at two or more locations in at least one axial direction in the
    Decompression release section are formed, and the inert gas outgass on a downstream side of the decompression relaxation section.
    [0011]
    According to a second invention, in the worm device according to the first invention, the second invention is configured as the worm device for an injection molding machine, wherein the decompression release section has a multi-flight worm thread of at least two worm threads.
    [0012]
    According to a third invention, in the screw device according to the first or second invention, the third invention is configured as the screw device for an injection molding machine, the seal structure comprising: a reduced diameter portion in which the screw device is reduced in diameter; and a seal ring fitted in the reduced diameter portion with a predetermined gap and in a fluid-tight manner with respect to a bore of the nozzle. ♦ · * * ·· * ·· # * ς · ·
    Heating cylinder slides, wherein a tapered or ionic surface, on which the sealing ring rests, is formed in the region of reduced diameter, wherein the sealing ring separates from the conical surface and the high-pressure region and the low-pressure region communicate with each other via the gap, When the screw device is rotated in a predetermined direction, and wherein the sealing ring rests on the conical surface and blocks the connection between the high pressure region and the low pressure region when the screw is rotated in a reverse direction.
    [0013]
    According to a fourth invention, in the screw device according to the first or second invention, the fourth invention is embodied as the screw device for an injection molding machine, the seal structure comprising: a gasket separating the high-pressure region and the low-pressure region from each other in a liquid-tight manner; a communication passage that allows communication of the high-pressure region and the low-pressure region with each other; and a valve mechanism that closes the communication passage and causes the molten resin to flow into the low pressure region as soon as the molten resin in the high pressure region exceeds a predetermined pressure.
    [0014]
    According to a fifth invention, in the screw device according to the first to fourth invention, the fifth invention is embodied as the screw device for an injection molding machine, wherein an injection port through which inert gas dissolved in an additive is introduced in a supercritical state reacts at a predetermined position of the heating cylinder is formed on the high pressure area, and wherein a Ausgasöffnung through which the inert gas outgas ···· * ♦ · * * · ·, is formed at a predetermined position of the HeizzylindeYs responsive to the low pressure region.
    [0015]
    According to a sixth invention, in the screw device according to the first to fourth invention, the sixth invention is configured as the screw device for an injection molding machine, wherein an injection port through which a high-pressure inert gas is introduced at a predetermined position of the heating cylinder is responsive to the high-pressure region is formed, wherein an A-usgasöffnung through which the inert gas outgassing, is formed at a predetermined position of the heating cylinder responsive to the negative pressure region, and wherein a valve which opens at a predetermined pressure, is arranged at the Ausgasöffnung. Advantageous Effects of Invention [0016]
    According to the foregoing, the present invention is directed to the screw device for an injection molding machine in which the inner part of the heating cylinder is divided into the high-pressure region in the upstream side and the low-pressure region in the downstream side through the seal structure disposed at the predetermined position of the screw device the molten resin is fed to the low pressure region after the inert gas is introduced into the high pressure region, and the inert gas outgassing in the low pressure region. In other words, the present invention is directed to a screw device for an injection molding machine which makes it possible for an additive, such as a surface-modifying material formed of a metal complex, to efficiently penetrate and disperse the molten resin, or is directed to a screw device for an injection molding machine, which comprises performing a foam molding with a physical foam-forming agent, which is formed from the inert gas, ···· *, ♦ ··· ··· ·; · * Allows. According to the present invention, the predetermined decompression release portion is disposed on the screw means on the downstream side of the seal structure, the deep groove portions with the deep intermediate screw passage groove are formed at two or more locations, and the flat groove portions with the flat intermediate screw passage groove are at the two or more positions in FIG at least the axial direction in the
    Decompression release section formed, and the inert gas ausgas on the downstream side of the decompression relaxation section. In other words, the decompression release portion is disposed in the low pressure region, and the shallow groove portions capable of lowering the pressure by a displacing action are disposed at the two or more locations in the axial direction. Due to this structure, the molten resin flows through the decompression release portion and the pressure of the resin is gradually lowered as the molten resin flows from the high pressure region into the low pressure region. As the inert gas subsequently outgasses, venting in the venting area, i. at the exhaust port, which is arranged in the heating cylinder, can be reliably prevented. According to a further aspect of the present invention, the multi-flight flight of at least two flights forms the
    Dekompressionsentspannungsabschnitt. The molten resin into which the inert gas is introduced under high pressure, particularly the molten resin into which the inert gas is introduced in the supercritical state, has a high proportion of liquid state together with a low degree of viscosity. In the invention, for the multi-speed screw from at least two flights to form the
    Decompression relaxation section is formed, even the high-liquid molten resin downstream in the screw device is properly guided without flowing in the reverse direction, and there is a steady decrease in the pressure of the resin in the **
    Guaranteed decompression release section. Consequently, the ventilation and the gas pressure increase can be reliably prevented.
    Brief description of drawings [Fig. 1] Figs. 1 (a) to 1 (c) are views illustrating an injection molding machine according to a first embodiment provided with a screw device according to an embodiment of the present invention, wherein Fig. 1 (a) is a side sectional view of the injection molding machine , Fig. 1 (b) is a partial side view of the screw device in which the X part in Fig. 1 (a) is enlarged, and Fig. 1 (c) is a partial side view of the screw device, in which the Y part in Fig. 1 (a) is enlarged.
    [Fig. 2] FIG. 2 is a side sectional view illustrating an injection molding machine according to a second embodiment provided with the screw device according to the embodiment of the present invention.
    [Fig. 3] Fig. 3 is a side sectional view illustrating an injection molding machine according to the prior art.
    DESCRIPTION OF EMBODIMENTS [0018]
    Hereinafter, embodiments of the present invention will be described. An injection molding machine according to a first embodiment of the present invention is configured as an injection molding machine that performs efficient introduction and distribution using an inert gas in a supercritical state when a desired additive is caused to penetrate and disperse in a molten resin. Therefore, the injection molding machine according to the first embodiment of the present invention is similar in structure to the injection molding machines disclosed in PTL 1 and PTL 2. In other words, a heating cylinder 2 and a screw device 3 constitute an injection molding machine 1 according to the present embodiment as shown in Fig. 1 (a), wherein the screw device 3 is arranged so as to be capable of rotating in one direction and an axial direction in the heating cylinder 2 to be driven. Several band heaters are wound around an outer peripheral surface of the heating cylinder 2. These band heaters are not shown in the drawings.
    Similar to a screw device disclosed in PTL 1, the screw device 3 according to the present embodiment is provided with a specific structure suitable for using the inert gas in the supercritical state. In other words, a first seal structure 7 and a second seal structure 27 are disposed at predetermined positions of the screw device 3. As a result, an inner portion of the heating cylinder 2 is divided into three portions as described below, and a high-pressure area for inert gas introduction and a low-pressure area for outgassing of inert gas are thereby formed.
    [0020]
    A gasket 5 and a flow control mechanism 6 having a pressure adjusting action constitute the first seal structure 7. As shown in detail in FIG. 1 (c), the gasket 5 is disposed in a groove having a predetermined width and formed on an outer peripheral surface of the groove Screw device 3 is formed. The gasket 5 slides in continuous contact with a bore of the heating cylinder 2 and prevents molten resin from flowing on this outer peripheral surface. In other words, the inner part of the heating cylinder 2 is through this seal 5 and in a liquid-tight manner into a first region 8 on an upstream side and a second region 9 on a downstream side Page divided. The flow control mechanism 6 or more of the flow control mechanisms 6 are provided in the first seal structure 7. A communication passage 10 formed (drilled) in the screw device 3 to make communication between the first and second regions 8 and 9, and a valve mechanism 40 opening and closing the communication passage 10 constitute the flow control mechanism 6. A center part of the Connecting passage 10 is reduced in diameter in a tapered shape, and this causes a tapered bearing surface 13 to be formed. The communication passage 10 is closed as soon as a head part 15 of a conical valve 14, which forms the valve mechanism 11, rests on the support surface or the seat. The umbrella-shaped head portion 15 and a shaft portion 16 form the cone valve 14, and a plurality of disc springs 18, 18, etc. are disposed in the shaft portion 16. The cone valve 14 on which the Belleville springs 18, 18, etc. are arranged as described above resides in a base and punched seat 19. The seat 19 is formed in an internal thread formed on an inner peripheral surface of the communication passage 10 screwed and fixed, which is formed on an outer peripheral surface of the receptacle 19. Therefore, the cone valve 14 closes the communication passage 10 with the head part 15 biased by the cup springs 18, 18, etc., and pressed against the seating surface 13. As soon as the molten resin in the first region 8 reaches a predetermined pressure, the plug valve 14 retracts against the bias of the spring washers 18, 18 and so on. Thus, the first and second regions 8 and 9 communicate with each other, and the molten resin flows into the second region 9. A resin passage 20 is formed in the receptacle 19. Once the first area and the second area 8 and 9 communicate with each other, the molten resin flows from the resin passage 20 into the second area 9. When the first and second areas 8 and 9 have the same pressure of the molten resin or if second area 9 has a higher pressure, the cone valve 14 is pressed onto the support surface 13 and the connection is interrupted, and thus a backflow of the molten resin from the second region 9 into the first region 8 is completely prevented.
    [0021]
    As shown in detail in Fig. 1 (b), a reduced diameter portion 28 and a seal ring 29 constitute the second seal structure 27. The reduced diameter portion 28 is a portion of the screw device 3 having a reduced diameter. The seal ring 29 is arranged to have a predetermined gap with respect to the reduced diameter portion 28. A
    The outer peripheral surface of the seal ring 29 is in continuous contact with the bore of the heating cylinder 2, and the molten resin does not flow out of the outer peripheral surface. In other words, the inner part of the heating cylinder 2 is divided by this sealing ring 29 in a liquid-tight manner into the second region 9 on the upstream side and a third region 30 on the downstream side. The reduced diameter portion 28, at which the seal ring 29 is fitted in the gap, has a larger diameter on the upstream side, thereby causing the formation of a tapered surface 31. An upstream side end portion of the seal ring 29 is formed to also have a conical shape. When this tapered end portion of the seal ring 29 is separated from the tapered surface 31, the second and third portions 9 and 30 communicate with each other by the gap between the reduced diameter portion 28 and the seal ring 29, and the molten resin flows * * Downstream. As soon as the end region of the sealing surface of the sealing surface rests on the conical surface 31, the connection is interrupted and the flow of the molten resin is prevented. A pin 32 is disposed in the reduced diameter portion 28 so that a lock portion formed in the seal ring 29 is locked. When the screw device 3 is rotated in a forward direction in a measuring process, the sealing ring 29 is locked by the pin 32, a molten resin flow path is ensured, and the molten resin is guided into the third region 30. Once the screw device 3 is rotated backwards by about 180 degrees, the locked state is released and the sealing ring 29 rests on the conical surface 31. In other words, the connection is blocked. Then, the flow of the molten resin into the third region 30 is reliably prevented even when the pressure of the molten resin in the second region 9 increases. Further, reverse flow of the molten resin from the third region 30 into the second region 9 during injection or the like is prevented.
    [0022]
    As described above, the inner part of the heating cylinder 2 is divided into the first to third regions 8, 9 and 30 by means of the first and second sealing structures 7 and 27.
    The first region 8 is a melting region in which the resin material is melted. The high-pressure region in the sense of the claims corresponds to the second region 9, in which the inert gas is introduced into the molten resin at high pressure. The low-pressure region in the sense of the claims corresponds to the third region 30, in which the inert gas outgasses from the molten resin. The sealing structure according to the claims corresponds to the second sealing structure 27, which is a sealing structure which separates the high-pressure region and the low-pressure region from each other. z w ~ w ·······················································
    Hereinafter, a screw flight of the screw device 3 according to the present embodiment will be described. Generally, in the first region 8 of the screw device 3, i. formed on the side upstream of the first seal structure 7, a single pitch and pitch helix, the resin material being melted and led forward. The second section 9 of the screw device 3, that is, the high-pressure section, is a mixing section 34. A multi-flight screw train, which is a so-called barrier type, forms the second section 9, i.e., the high pressure section, and a mixture is efficiently performed therein. An injection port 21 is disposed in the heating cylinder 2 so as to respond to the second region 9. An additive injector 23 is connected to the injection port 21. The additive injector 23 is a device that causes inert gas supplied from a gas cylinder 24, such as carbon dioxide, to be placed in the supercritical state and that the additive supplied from an additive supply tank 25 in the form of a surface-modifying material in which inert gas is dissolved in the supercritical state for supply to the heating cylinder 2.
    [0024]
    A decompression release section 35 provided with a worm gear unique to the present invention is disposed in the third section 30 of the screw device 3, that is, in the low pressure section. The helix of the
    Decompression release section 35 is a multi-flighted flight having a plurality of flights having a pitch equal to a general flight. In the present embodiment, a double-flighted flight forms the flight of the
    Decompression release section 35. Since several ··· · ♦ ··· * ············· «
    Helixes the helix of the * ** ........
    As described above, as described above, the molten resin led out from the decompression release portion 35 does not undergo flow disturbance or reverse flow even at low viscosity, and is conducted downstream without hindrance. In the decompression release portion 35, deep groove portions 37 and 37 having a deep screw groove and flat groove portions 38 and 38 having a flat screw groove are formed at two or more locations in the axial direction. In other words, the flat groove portions 38 and 38 are formed at two or more locations. The shallow groove portions 38 and 38 have a displacing effect, and thus the pressure of the molten resin is appropriately lowered during the flowing of the molten resin.
    [0025]
    The side of the screw device 3 downstream of the decompression release portion 35, which corresponds to the negative pressure region, is formed as a generally single screw flight. A vent opening 40 through which the inert gas outgasses is disposed on a portion of the heating cylinder 2 responsive to this single flight. In other words, the inert gas exits on the downstream side of the decompression release portion 35. The Ausgasöffnung 40 is opened and closed by a Ausgasventil 41.
    [0026]
    An effect of the injection molding machine 1 according to the first embodiment of the present invention will now be described. The screw device 3 is rotated in the forward direction with the heating cylinder 2 heated, and the resin material is supplied from a hopper (not shown). The supplied resin material is heated by the heat of the heating cylinder 2 and by heat caused by a shearing force of the rotation of the: ** ** · ····. , · · · · · · · · · ·········
    The worm device 3 in the first region 8 cLLa * T3eitraif ·· is melted and is introduced into the second region 9, i. in the high pressure area, led.
    [0027]
    Once a predetermined amount of the molten resin is guided in the second region 9, the rotation of the screw device 3 is stopped and it is rotated by about 180 degrees backwards. Subsequently, the lock is released by the pin 32 in the second seal structure 27, and the seal ring 29 is rotated by 180 degrees relative to the screw device 3. Then, the sealing ring 29 rests on the conical surface 31 and the connection between the second and the third region 9 and 30 is interrupted. The additive injector 23 injects the additive, such as the surface-modifying material formed of a metal complex, and the inert gas, which is in the supercritical state, into the second region 9 of the heating cylinder 2, that is, the high-pressure region. The high pressure area is completely sealed by the first and second seal structures 7 and 27, and thus the molten resin does not enter the first area 8 nor the third area 30 which is the low pressure area even when the molten resin reaches a high pressure , wherein the inert gas is introduced. The introduction of the inert gas in the supercritical state causes the viscosity of the molten resin to decrease and its liquid state to increase, and the additive rapidly penetrates into the molten resin and disperses therein.
    [0028]
    The screw device 3 is rotated in the forward direction. Subsequently, the sealing ring 29 separates from the conical surface 31 in the second sealing structure 27 and the second and third regions 9 and 30, i. the high-pressure area and the low-pressure area, communicate with each other. Since that • · · · · · «. :
    Outgassing valve 41 is open, the NiederdrucKebereibh, ** def ϊ * Λ the vicinity of the exhaust port 40 is close to the atmospheric pressure. Then, the molten resin is strongly charged in the high pressure region and flows to the side of the low pressure region. However, the molten resin flows through the decompression release section 35 when the molten resin is led from the high-pressure region to the low-pressure region, and no aeration occurs when the inert gas outgassed at the exhaust port 40. In particular, the molten resin is continuously in the
    Decompression release section 35 guided by two flights downstream. The pressure of the molten resin is reduced by the two shallow groove portions 38 and 38. In other words, the two shallow groove portions 38 and 38 become a flow resistance for molten resin, and an increase in the flow velocity is damped. In the screw device 3 according to the present embodiment, the pressure of the molten resin is gradually reduced by the decompression release portion 35, and the flow velocity is suppressed as described above, and thus the molten resin is gently guided downstream. As a result, the ventilation of the molten resin at the exhaust port 40 is prevented. The inert gas is exhausted from the exhaust port 40, and the molten resin in which the additive such as the surface-modifying material is uniformly dispersed is obtained. Once a predetermined amount of the molten resin has been measured, the molten resin is injected by the screw device 3, which is driven in the axial direction, as is known in the art.
    [0029]
    In the following, an injection molding machine 1 'according to a second embodiment will be described. The injection molding machine 1 'according to the second embodiment is constructed as an injection molding machine which produces a molded foam product using a physical foaming agent formed outside , As shown in FIG. 2, the injection molding machine 1 'is constructed substantially the same structure as the injection molding machine 1 according to the first embodiment. The same reference numerals are used to designate components of the injection molding machine 1 'according to the second embodiment, which are similar to the components of the injection molding machine 1 according to the first embodiment, and a description thereof will be omitted. In the injection molding machine 1 'according to the second embodiment, an inert gas injection device 43, which introduces the inert gas, is disposed at the injection port 21.
    A check valve or check valve 44 is arranged at the Ausgasöffnung 40. The valve is opened when the pressure of the Ausgasöffnung 40 is equal to or higher than a predetermined pressure, about 5 MPa. In other words, the vicinity of the exhaust port 40 is maintained at a constant pressure.
    [0030]
    The injection molding machine 1 'according to the second embodiment produces the molded foam product as follows, and this will not be described in great detail, as those skilled in the art can easily understand it. The screw device is rotated and the molten resin is introduced into the second region 9, i. in the high pressure area, led. The screw device is rotated backwards by approximately 180 degrees and the connection in the second sealing structure 27 is interrupted. In this state, a small amount of the inert gas is introduced into the high-pressure region. Then, the pressure of the molten resin increases, for example, to 10 MPa. Once the screw device is rotated in the forward direction, the connection is made in the second sealing structure 27, and the molten resin is led into the third region 30, that is, the low pressure region, while it is in the • · ········ · · ·
    Mixing section 34 is kneaded. The low pressure is controlled by the check valve 44 to reach 5 MPa, and thus the molten resin is led to the low pressure region from the high pressure region with pressure. However, the flowing of the molten resin is suppressed by the decompression release section 35, the pressure of the molten resin is steadily lowered, and the aeration at the exhaust port 40 is suppressed. Once the inert gas has flown out of the exhaust port 40, the molten resin is obtained in the third region 30, with the inert gas having saturation solubility dissolved under a pressure of 5 MPa. The mold-foamed product is obtained by injection of the molten resin.
    [0031]
    The present embodiment can be modified in various ways. For example, the first and second seal structures 7 and 27 may be configured to have a different structure as long as the sealing effect can be obtained and the molten resin can flow in a predetermined condition. For example, the same as in the first sealing structure 7 can also be used for the second sealing structure 27. Modifications can also be made with regard to other aspects as well. For example, the threads of the first and second regions 8 and 9 do not need to be limited to those according to the present invention, and they may be replaced by other types of threads.
    [0032]
    The present invention is not limited to the above-described embodiments and can be appropriately modified and improved. Further, the materials, shapes, dimensions, numerical values, shapes, quantities, locations of the arrangement, and the like with respect to the respective * ·· * ** ··· ···
    Components of the embodiments previously * bes * cfirie * and sirtS, not limited and may be arbitrary, as far as the present invention can be achieved therewith.
    [0033]
    The present invention will be described in detail with reference to the specific embodiments. It will be apparent to those skilled in the art that various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention.
    [0034]
    The disclosure of Japanese Patent Application No. 2014-042373 filed on Mar. 5, 2014 including the specification, drawings and abstract is hereby incorporated by reference in its entirety.
    [0035]
    Hereinafter, characteristics of the embodiments of the screw device of an injection molding machine and the injection molding machine according to the present invention described above will be concisely summarized and listed as in the following [1] to [6].
    [1] A screw device (3) for an injection molding machine (1), which is formed so that an inner part of a heating cylinder (2) into a high pressure area in a rear part (first area 8, second area 9) and a low pressure area in a front part (second area 9, third area 30) is divided by a sealing structure (first sealing structure 7, second sealing structure 27), which at a predetermined position of
    Screw device (3) is arranged, a molten resin ···· ······ in the low-pressure region (third region 3 * (5) is guided * after an inert gas is introduced into the high-pressure region (second region 9) , and the inert gas outgassing in the low pressure region (third region 30), wherein in the screw device (3) a predetermined decompression release portion (35) is disposed on a downstream side of the seal structure (second seal structure 27), deep groove portions (37) having a deep female screw groove two or more locations and shallow groove portions (38) having a shallow female screw groove at two or more locations in at least one axial direction in the
    Decompression release section (35) are formed, and the inert gas outgass on a downstream side of the decompression release section (35).
    [0037] [2] The screw device (3) for an injection molding machine according to [1], in which a multi-flight screw train of at least two flights forms the decompression release section (35).
    [3] The screw device (3) for an injection molding machine according to [1], wherein a reduced diameter portion (28) in which the screw device (3) is reduced in diameter, and a seal ring (29), is fitted into the reduced diameter portion (28) with a predetermined gap and slides in a fluid tight manner with respect to a bore of the heating cylinder (2) forming the sealing structure (second sealing structure 27), a conical surface (31) on which the sealing ring (29) rests in the region of reduced diameter (28) is formed, the sealing ring (29) is separated from the conical surface (31) and the high pressure region (second region 9) and the low pressure region (third region 30) over connect the gap when <ä * ie ** * **
    Worm device (3) is rotated in a predetermined direction, and the sealing ring (29) rests on the conical surface (31) and the connection between the high-pressure region (second region 9) and the low-pressure region (third region) interrupts, when the screw means (3 ) is rotated in a reverse direction.
    [0039] [4] The screw device (3) for an injection molding machine (1) according to [1], in which the sealing structure (first sealing structure 7) is provided with a seal (5) covering the high-pressure region (first region 8) and the low-pressure region ( second region 9) separates from each other in a liquid-tight manner, with a connection passage (10) which allows a connection of the high-pressure region (first region 8) and the low-pressure region (second region 9) with each other, and with a valve mechanism (11), the connection passage ( 10) closes and causes the molten resin to flow into the low pressure region (second region 9) as soon as the molten resin in the high pressure region (first region 8) exceeds a predetermined pressure.
    [5] An injection molding machine (1) having the screw device (3) according to any one of [1] to [4], in which an injection port (21) through which an inert gas dissolved in an additive is introduced in a supercritical state , at a predetermined position of the heating cylinder (2) responsive to the high-pressure region (second region 9) is formed, and a Ausgasöffnung (40) through which the inert gas outgassing, at a predetermined position of the heating cylinder (2) responsive to the low-pressure region (third Area 30) is formed.
    [6] An injection molding machine (1) having the screw device (3) according to any one of [1] to [4], in which an injection port (21) through which a high-pressure inert gas is introduced, formed at a predetermined position of the heating cylinder (2) responsive to the high-pressure region (second region 9), a Ausgasöffnung (40) through which the inert gas outgassing, at a predetermined position of the heating cylinder (2) responsive to the low-pressure region (third region 30 ), and a valve (check valve 44) opening at a predetermined pressure is disposed at the exhaust port (40).
    Industrial Applicability [0042]
    According to the present invention, there can be provided a screw device for an injection molding machine and an injection molding machine which are capable of surely and reliably preventing aeration during the outgassing of the inert gas. The present invention, which achieves this effect, is useful in the field of screw devices for injection molding machines and in the field of injection molding machines.
    List of Reference Numerals [0043] 1 injection molding machine 2 heating cylinder 3 screw device 5 seal 6 flow control mechanism 7 first seal structure 8 first region 9 second region 10 communication passage 11 valve mechanism 13 support surface • ··· ··· ··· 14 plug valve ....... .... 21 Injection opening 23 Additive injector 27 Second seal structure 30 Third area 34 Mixing section 35 Decompression releasing section 37 Deep groove area 38 Flat groove area 40 Outgassing opening 44 Shut-off valve or check valve
    权利要求:
    Claims (6)
    [1]
    Claims ·· ** ·· '···· * .. * ί * .. *
    A screw device for an injection molding machine, which is formed so that an inner part of a heating cylinder is divided into a high-pressure region on an upstream side and a low-pressure region in a downstream side by a sealing structure disposed at a predetermined position of the screw device, a molten resin in the low pressure region is guided after an inert gas is introduced into the high pressure region, and the inert gas outgates in the low pressure region, wherein in the screw means a predetermined decompression release portion is disposed on a downstream side of the seal structure, deep groove portions are formed with a deep female screw groove at two or more locations , and shallow groove portions having a shallow female screw groove at two or more locations in at least one axial direction in FIG. 1 are formed in the decompression release portion, and the Ine outgas on a downstream side of the decompression release section.
    [2]
    2. The screw device for an injection molding machine according to claim 1, wherein the decompression release section comprises a multi-flight flight of at least two flights.
    [3]
    3. The screw device for an injection molding machine according to claim 1, wherein the seal structure comprises: a reduced diameter portion at which the screw device is reduced in diameter; and a seal ring fitted in the reduced-diameter portion with a predetermined gap and sliding in a liquid-tight manner with respect to a bore of the heating cylinder, a conical surface on which the seal ring rests. *** " is formed in the reduced diameter with the sealing ring being separated from the conical surface and the high pressure region and the low pressure region communicating with each other via the gap when the screw device is rotated in a predetermined direction, and wherein the sealing ring rests on the conical surface and interrupts the connection between the high pressure region and the low pressure region when the screw is rotated in a reverse direction.
    [4]
    4. The screw device for an injection molding machine according to claim 1, wherein the seal structure comprises: a gasket separating the high pressure region and the low pressure region in a liquid tight manner; a communication passage that allows communication between the high-pressure region and the low-pressure region; and a valve mechanism that closes the communication passage and causes the molten resin to flow into the low pressure region as soon as the molten resin in the high pressure region exceeds a predetermined pressure.
    [5]
    5. An injection molding machine having the screw device according to claim 1, wherein an injection port through which an inert gas dissolved in an additive is introduced in a supercritical state is formed at a predetermined position of the heating cylinder responsive to the high pressure region, and wherein a Ausgasöffnung through which the inert gas outgassing, is formed at a predetermined position of the heating cylinder responsive to the negative pressure region. • · · · · · · · · f
    [6]
    An injection molding machine comprising the screw according to any one of claims 1 to 4, wherein an injection port through which a high pressure inert gas is introduced is formed responsive to the high pressure region at a predetermined position of the heating cylinder wherein a vent opening through which the inert gas is outgassed is formed at a predetermined position of the heating cylinder responsive to the low pressure area, and a valve opening at a predetermined pressure is disposed at the vent opening.
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    同族专利:
    公开号 | 公开日
    JP5710813B1|2015-04-30|
    WO2015133553A1|2015-09-11|
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    JP2015168079A|2015-09-28|
    DE112015001078T5|2016-11-10|
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    法律状态:
    2021-11-15| PC| Change of the owner|Owner name: MAXELL LTD., JP Effective date: 20211012 Owner name: THE JAPAN STEEL WORKS, LTD., JP Effective date: 20211012 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2014042373A|JP5710813B1|2014-03-05|2014-03-05|Injection molding machine screw and injection molding machine|
    PCT/JP2015/056435|WO2015133553A1|2014-03-05|2015-03-04|Screw for extrusion molding machine, and extrusion molding machine|
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