JP2015104871A - Material injection device, injection molding machine, and seal member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine that can perform stable continuous molding operation even if molding is performed under a high injection pressure condition, by preventing the reverse flow of a resin due to deterioration of a fitting state of an injection nozzle to a nozzle support member.SOLUTION: An injection molding machine comprises: a nozzle that is connected to a tip of a heating cylinder and injects a plasticized resin material into a mold; a nozzle support member that supports the nozzle and abuts on the mold; and a seal member that is fitted between an outer periphery of the nozzle and the nozzle support member, and includes a fitting hole fitted to a tip of the nozzle, a tapered surface facing a tapered outer peripheral surface of the nozzle, a pressure receiving surface for pressing the tapered surface in a direction of close contact with the outer peripheral surface of the nozzle by pressure of the resin material, and a restriction surface that is fitted to a cylindrical surface of the nozzle support member parallel to a central axis of the nozzle to suppress an increase in the outer diameter of the seal member.

Description

  The present invention relates to an injection molding machine, and more particularly to a technique for preventing a back flow of resin from a fitting portion between an injection nozzle and a fixed platen.

  Conventionally, an injection molding machine basically includes an injection device for plasticizing a pellet-shaped resin material and injecting it into a mold side, and a mold clamping device for opening and closing the mold. The resin softened and melted in the injection cylinder of the injection apparatus is injected from the tip of the injection nozzle connected to the injection cylinder to the mold side after completion of the mold clamping operation.

  For example, in Patent Document 1 and Patent Document 2, when the injection cylinder of the injection device advances, the injection nozzle overcomes the resin pressure against the mold attached to the mold clamping device side, and a nozzle touch state is established. An injection molding machine is disclosed. As a drive device for moving the injection cylinder back and forth, an electric type using a motor, a pulley, a belt, and the like, and a hydraulic type using a hydraulic cylinder, a pump, piping, and the like are known. Patent Document 3 discloses an injection molding machine having a seal member that prevents backflow of resin.

JP-A-9-277306 JP 2000-167875 A JP 2010-173228 A

  In the conventional injection molding machines as disclosed in Patent Documents 1 and 2 above, the injection nozzle is made by fitting and contacting a nozzle support member that supports the injection nozzle and plasticizing and melting resin on the mold side. Eject. Therefore, the fitting state of the injection nozzle and the nozzle support member may be deteriorated due to deformation of the injection nozzle or the like due to the resin pressure. In addition, the injection nozzle touches the mold where the spool runner and cavity are formed directly below, but depending on the resin, filler-filled resin may be used. There is a case where the fitting state is deteriorated due to the wear.

  As the fitting state of the injection nozzle and the nozzle support member progresses in this way, a backflow of resin occurs with the resin pressure during injection. If this happens, it will not be possible to apply the molding pressure and holding pressure that must be applied to the mold, resulting in molding defects such as sink marks and short shots, and continuous molding under optimal molding conditions. It becomes impossible. In addition, because the injection nozzle has a heater and a thermocouple that controls the heater temperature, the backflowed resin covers the thermocouple, making it impossible to control the temperature properly, and the heater is damaged due to the resin pressure being applied. May cause problems.

  As an improvement measure, Patent Document 3 proposes an injection molding machine having a seal member 11 fitted between an injection nozzle 10 and a nozzle support member 7 as shown in FIGS. This seal member is made of a material having a lower thermal conductivity than the injection nozzle and the nozzle support member and having a high heat resistance, for example, a heat-resistant resin or ceramic, in order to prevent heat escape from the injection nozzle to the nozzle support member as much as possible. .

  However, in the configuration disclosed in Patent Document 3, the injection cylinder (nozzle) is slightly displaced toward the nozzle support member against the rigidity of the injection cylinder fixing portion by the injection pressure at the time of injection, and compresses the seal member. When the injection operation is completed, it is opened and restored. The behavior is repeated during continuous molding. In this case, the higher the injection pressure setting, the greater the displacement and the stronger the compression. In the shape of the sealing member described in Patent Document 3 (slip-off type), the upper part is pushed and expanded by compression, and tensile stress is generated. If the allowable stress of the material is exceeded, the sealing member is damaged and loses its function, and a back flow of the resin occurs. Although sufficient effects can be obtained under conditions that do not lead to breakage, there is a problem that molding under higher injection pressure conditions is not possible.

  In an apparatus for injecting a material, the sealing performance between the nozzle and its supporting member is very important, so that it is desired to improve the sealing performance.

  The present invention provides to improve the reliability of the sealing performance between a nozzle for injecting a material and its support member.

  A material injection apparatus according to the present invention includes a nozzle for injecting a material, a nozzle support member into which a tip end portion of the nozzle is inserted and supported, and a seal member engaged between the nozzle and the nozzle support member. The nozzle support member is provided with a nozzle support hole in which the tip side of the nozzle is inserted and supported with the seal member interposed therebetween, the nozzle support hole including an inclined surface corresponding to the outer peripheral surface of the nozzle, And a contact surface that is provided on the periphery of the opening on the side where the tip of the nozzle is inserted and that contacts the end of the seal member. The present invention is not limited to the material injection device described above, and includes such a material injection device and a mold for forming the injection material connected to the material injection surface of the material injection device. The injection molding machine is also widely targeted.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve the reliability of the sealing performance of the nozzle which inject | emits material, and its support member.

It is the figure which partially fractured and showed the whole structure of the injection molding machine concerning one Embodiment of this invention. It is sectional drawing which shows the internal structure of the principal part in the injection molding machine of one Embodiment. It is sectional drawing which shows the fitting structure of the sealing member provided between the injection nozzle and fixed platen in one Embodiment. It is an enlarged view which shows the principal part around the injection nozzle in one Embodiment. It is a figure which shows the positional relationship of the injection nozzle in one Embodiment, a stationary-side platen, and a sealing member. It is a figure which shows a sealing member single item. It is a perspective view which shows the sealing member single item. It is sectional drawing which shows the fitting structure of the sealing member provided between the injection nozzle and fixed platen in a prior art example. It is a figure which shows the sealing member single goods in the prior art example shown in FIG.

  Hereinafter, an embodiment of an injection molding machine according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a partially cutaway view showing the entire configuration of an injection molding machine according to the present embodiment, and FIG. 2 shows the internal structure around the injection apparatus and the mold.

  The injection molding machine in the present embodiment plasticizes a resin material and injects the resin material into a cavity 2 in a mold formed between the fixed side mold plate 3a and the movable side mold plate 3b (material injection). Apparatus), a mold 3 (fixed side mold plate 3a and movable side mold plate 3b), and a mold clamping device.

  The injection apparatus according to the present embodiment includes a material supply unit that supplies a resin material (injection material) that is a raw material to be injected into the heating cylinder, and a plasticization injection unit that plasticizes and injects the resin material. In the material supply unit, the resin from the hopper that stores the resin material is supplied from the material supply port 24 to the resin supply path 22, and further, the feeder pin that slides in the resin supply path 22 by driving the material supply motor 25. 34 is sent to the heating cylinder 13 of the plasticizing injection part.

  The heating cylinder unit constituting the plasticizing injection unit includes a heating cylinder 13, tobeads 12a and 12b, an injection nozzle 10, lock nuts 14a and 14b, a band heater 16, a nozzle heater 15, a cylinder thermocouple 18, and a nozzle thermocouple 17. ing. The heating cylinder unit is attached so that the resin passage 20 and the resin supply passage 22 of the jacket 21 communicate with each other in a state in which the plunger 19 is fitted to the heating cylinder 13, and is pressed against the jacket 21 by the fixing member 23. Fixed.

  The plasticizing injection unit includes a plunger 19 slidably fitted to the heating cylinder 13 and a plunger driving unit for reciprocatingly driving the plunger 19. An injection nozzle 10 is formed at the tip of the heating cylinder 13 whose outer periphery is surrounded by the band heater 16.

  The plunger drive unit includes an injection motor 28, an injection ball nut 26a that is rotatably supported, and a ball screw shaft 26b that is screwed to the injection ball nut 26a. A driving sprocket is integrally connected to the injection motor 28, and an endless timing belt 27 is stretched between the driving sprocket and a driven sprocket provided integrally with the injection ball nut 26a. Therefore, the rotation of the injection motor 28 is transmitted to the injection ball nut 26 a by the timing belt 27, and the plunger 19 connected to the ball screw shaft 26 b can be reciprocated in the heating cylinder 13.

  In addition, the heating cylinder 13 is connected to the jacket 21, and the upper portion of the heating cylinder 13 has a structure having a male screw part 42, and is fastened by lock nuts 14 a and 14 b whose inner surfaces have a female screw structure. Yes. Several nut holes (not shown) are provided on the side surfaces of the lock nuts 14a and 14b so that a rod-shaped one can be inserted and rotated easily. A wave spring 43 is sandwiched between the jacket 21 and the heating cylinder 13. With such a configuration, the heating cylinder 13 and the injection nozzle 10 can adjust their positions relative to the stationary platen 7 by rotating the lock nuts 14a and 14b.

  The mold clamping device in this embodiment includes an intermediate plate 6 to which the fixed side mold plate 3a is attached, a movable side platen 5 to which the movable side mold plate 3b facing the fixed side mold plate 3a is attached, and a mold driving unit. Have. A spool runner 1 is formed on the fixed-side template 3a, and a molded product-shaped cavity 2 is formed between the fixed-side template 3a and the movable-side template 3b. The cylindrical groove 37 (see FIG. 3, space portion) of the spool runner 1 serves as an escape for preventing interference with the fixed-side template 3a when the heating cylinder 13 is moved and adjusted as described above.

  The mold drive unit according to the present embodiment includes a mold clamping motor 29, a ball screw 30 for converting the rotational power of the mold clamping motor 29 to linear drive, and a gap between the ball screw 30 and the movable platen 5. And a toggle mechanism having two link arms 31 and 32 that are connected to drive the movable platen 5.

  A tie bar 36 slidably passes through the movable platen 5 and the intermediate plate 6, and is driven between a forward end that is a mold clamping position and a reverse end that is in a mold open state by driving a mold clamping motor 29. Can be reciprocated along the tie bar 36. When the mold clamping is completed, the movable platen 5 and the movable mold plate 3b are pressed against the fixed platen 7 with the intermediate plate 6 that fixes the fixed mold plate 3a interposed therebetween.

  Reference numeral 8 denotes a runner lock member, which is driven by a runner discharge drive unit 9 including a small motor to enter and exit the mold in a direction substantially perpendicular to the opening and closing direction of the mold to hold and discharge the runner. In the mold-clamping state of FIG. 2, it is a part of the contact surface with the fixed-side platen 7 in a state of being fitted into the runner lock member fitting groove formed in the intermediate plate 6 and the fixed-side mold plate 3a. The mold can be opened and closed without any problems.

  In the above-described configuration, after the mold clamping is completed, the resin (molten material) injected from the nozzle 10 passes through the spool runner 1 formed on the fixed-side mold plate 3a, and the fixed-side mold plate 3a and the movable-side mold plate 3b. Are filled into the cavity 2 formed, and a molded product is molded.

  After cooling the molded product, the mold clamping motor 29 is reversely rotated, and the movable platen 5 is lowered to perform mold opening. In the mold opening operation, the intermediate plate 6 and the movable platen 5 are separated from the fixed platen 7, and the intermediate plate 6 is retracted to a predetermined position and stopped, and the movable platen 5 is separated from the intermediate plate 6.

  As the intermediate plate 6 is lowered, the spool runner 1 is separated from the nozzle 10 and the fixed-side template 3a and is fixed to the runner lock member 8. The runner lock member 8 is driven rightward in FIG. 1 by driving the runner discharge drive unit 9 to discharge the spool runner 1 out of the molding machine.

  As the movable platen 5 is lowered, the molded product is ejected from the movable mold plate 3b by the ejector pins 44 of the ejector mechanism 38 incorporated in the movable platen 5.

  Next, the configuration around the injection nozzle of the injection molding machine in the present embodiment will be described in more detail with reference to FIGS.

  FIG. 3 is a sectional view showing a fitting configuration of a backflow prevention seal member that engages with the injection nozzle provided between the injection nozzle and the stationary platen, FIG. 4 is an enlarged view of the main part, and FIG. The positional relationship between the injection nozzle, the fixed platen, and the backflow preventing seal member is shown, and FIGS. 6 and 7 show the configuration of the backflow preventing seal member.

  In the present embodiment, the tip end side of the injection nozzle 10 is held in a state where it cannot move to the stationary platen 7. The injection nozzle 10 is inserted and supported in a nozzle mounting hole 39 which is a cylindrical hole of the fixed side platen 7, and the injection nozzle tip 10 b is fitted to the fitting hole 33 (nozzle support hole, nozzle tip insertion hole) of the fixed side platen 7. ) And is fixed so that it fits. In addition, the injection nozzle 10 is arranged such that the lower surface 4c of the injection nozzle tip is substantially flush with the contact surface 45 (material injection surface) of the fixed platen 7 with the fixed mold plate 3a in a state where the temperature is raised to the molding temperature. Adjusted to be installed. The position of the injection nozzle 10 can be adjusted by changing the position of the heating cylinder unit by turning the lock nuts 14a and 14b.

  The seal member 11 in the present embodiment is interposed between the injection nozzle 10 and the fixed side platen 7 so as to close the gap between the two, and the application thereof is, for example, backflow prevention, but is not limited thereto. Instead, a sealing property between the injection nozzle 10 and the stationary platen 7 is provided. Hereinafter, the case where the sealing member 11 in this embodiment is applied for backflow prevention will be described.

  Here, the backflow preventing seal member 11 in the present embodiment has a squirrel-shaped shape as in the prior art, and a nozzle insertion hole is provided in the center thereof. The seal member 11 is formed with tapered surfaces 11a and 11e in the outer shape and the inner shape. The tapered surfaces 11a and 11e are formed in accordance with the shape of the fixed side platen tapered hole 7a (inclined surface corresponding to the nozzle) of the fixed side platen 7 and the shape of the injection nozzle tapered surface 10a which is the outer peripheral surface of the injection nozzle 10, respectively. ing. For this reason, positioning (centering) can be easily performed at the time of attachment, and adhesion is improved by a wedge effect. A flat surface (pressure receiving surface 11b) that is substantially perpendicular to the central axis of the injection nozzle is formed at the bottom. This is because the pressure of the resin backflowed from the fitting portion of the injection nozzle 10 and the nozzle support member that inserts and supports the injection nozzle 10 is received by the pressure receiving surface 11b, and the seal member 11 is pressed to the injection nozzle 10 side to make the contact more closely. This is to increase sex. A surface (regulating surface 11c) that is coaxial and substantially parallel to the axis is formed on the upper outer periphery (periphery of the opening). The opposing fixed side platen 7 (nozzle support member) is formed with a fitting portion 7b that is a cylindrical surface that is fitted with a regulating surface 11c and is continuously connected to the tapered surface 7a. By this fitting part 7b, the expansion of the upper outer diameter of the seal member 11 due to the injection pressure is suppressed and damage is prevented.

  Here, the fitting portion 7b is a part of the inner surface of the fitting hole 33, and the aforementioned tapered surface (an inclined surface corresponding to the outer peripheral surface of the injection nozzle 10) 7a and the tip of the injection nozzle 10 are inserted therein. Provided on the peripheral edge of the opening, and constitutes an abutting surface with which the end of the seal member 11 abuts. The fitting portion 7b serving as the contact surface is formed from a surface that intersects (has an angle) with respect to the above-described tapered surface 7a. The fitting portion 7 b serving as the contact surface plays a role of holding the seal member 11 in the gap between the injection nozzle 10 and the stationary platen 7. That is, the seal member 11 is pressurized between the injection nozzle 10 and the fixed side platen 7, and is difficult to be deformed or to maintain its state by receiving heat from the injection nozzle 10. In the case of the present embodiment, the fitting portion 7b described above serves as a substantial pawl when the seal member 11 is deformed or held, so that the seal member 11 is reliably held between the injection nozzle 10 and the stationary platen 7. This contributes to stabilization and maintenance of the sealing performance. That is, according to the configuration of the present embodiment, the reliability of the sealing performance can be improved.

  On the other hand, since the seal member 11 is interposed between the injection nozzle 10 and the fixed side platen 7 as described above, it is necessary to suppress heat escape from the injection nozzle 10 to the fixed side platen 7. Therefore, the seal member 11 is desirably formed of a material having a lower thermal conductivity than the material of at least the injection nozzle 10 and the fixed side platen 7, and is required to have heat resistance capable of withstanding the set temperature of the injection nozzle 10. The As an example, a heat insulating material such as Rossna board manufactured by Nikko Kasei Co., Ltd. or Myolex manufactured by Ryoden Kasei Co., Ltd. (inorganic laminated board based on glass fiber: thermal conductivity of about 0.2 to 0.3 W / m · k) And heat resistant temperature of about 400 ° C.) and ceramics such as steatite (thermal conductivity of about 2.5 to 3.0 W / m · k, heat resistant temperature of about 1000 ° C.).

  Moreover, it is good also as a shape which formed the recessed part in some taper surfaces 11a and 11e of the sealing member 11, and reduced the contact area. Of course, the concave portion may be formed on either one of the tapered surfaces or the tapered surfaces on both sides. What is necessary is just to determine suitably according to use conditions.

  The material of the seal member 11 is not limited to the above-described material, and an optimal material may be selected as appropriate in consideration of molding conditions, injection state, parts workability, cost, and the like.

  In general, when the temperature of the sealing member 11 is raised to the molding temperature, the size and shape of the sealing member 11 are determined and attached so as to be in close contact with each other between the fixed platen 7 and the injection nozzle 10. When the temperature rises, the heating cylinder unit expands in the direction of the fixed platen 7 to compress the seal member 11 and increase the adhesion strength.

  Further, in the relationship between the injection nozzle 10, the seal member 11, and the fixed side platen 7, the injection nozzle front end portion 10b has an injection nozzle front end upper portion 4a that fits into the seal member fitting hole 11d, and a fixed side platen fitting hole 33. And an injection nozzle tip lower part 4b that fits into the nozzle.

  That is, for the portion of the contact surface 45 that is affected by deformation due to resin pressure, abrasion due to the resin used, etc., the seal member 11 that is more susceptible to the influence than the stationary platen 7 made of a relatively hard material is formed. First, the injection nozzle 10 is configured to be fitted to the stationary platen 7.

  On the other hand, even with such a configuration, as in the above-described problem, the fitting state between the injection nozzle and the stationary platen 7 (nozzle support member) may be deteriorated to cause a back flow of the resin. . In this case, the seal member 11 prevents the back flow of the resin regardless of the fitting state of the injection nozzle 10 and the stationary platen 7. That is, the seal member 11 is interposed between the injection nozzle 10 and the fixed side platen 7 which is a support member thereof, and can hold a desired sealing performance by being held in that place.

  In particular, such a seal member 11 is particularly effective in a configuration in which the injection nozzle 10 is fixed and held in a state where the injection nozzle 10 cannot move to the fixed side platen 7 as in the present embodiment. In the configuration in which the injection nozzle 10 moves and abuts and fits with respect to the fixed side platen 7 at the time of injection, the injection nozzle 10 is pressed against the fixed side platen 7 with high pressure in the same manner as the mold clamping. May be eliminated by pressing the injection nozzle 10 against the stationary platen 7. However, in the configuration in which the injection nozzle 10 is fixed and held in a state where it cannot move to the fixed side platen 7 as in the present embodiment, the gap due to wear or the like can be eliminated by pressing the injection nozzle 10 against the fixed side platen 7. This is because it cannot be done. However, the present invention is effective even when the injection nozzle is movably fitted and contacted with the nozzle support member.

  In this embodiment, as can be seen from FIG. 4, the seal member fitting hole 11d that fits into the injection nozzle tip portion upper portion 4a and the fixed-side platen fitting hole 33 that fits into the injection nozzle tip portion lower portion 4b are It is provided discontinuously. This is configured such that when the resin flows backward, the resin that has entered the discontinuous portion presses the pressure receiving surface 11 b of the seal member 11.

  As described above, by fitting the seal member 11 having high adhesion between the contact surface of the injection nozzle 10 and the fixed side platen 7, the injection nozzle tip and the nozzle support member can be used depending on the injection pressure during the injection operation. Even when the fitting state with the (fixed side platen 7 in the present embodiment) is deteriorated, the progress of the back flow of the resin can be stopped.

  Further, the seal member 11 is easily replaceable due to a simple configuration in which the seal member 11 is compressed and fitted between the injection nozzle 10 and the stationary platen 7.

  Note that the support member to which the injection nozzle 10 is fitted / contacted at the time of injection is not limited to the fixed-side platen, and the configurations in the embodiments of various molding machines can be adopted.

  Further, the present embodiment aims to prevent the back flow of the resin without being affected by the fitting state between the injection nozzle and the nozzle support member, so that the contact surface 45 is fitted to the tip of the injection nozzle. The hardness of the nozzle support member is not particularly limited. Therefore, it should be noted that even if the nozzle support member is formed of a material having a lower hardness than the seal member, it depends on the embodiments of various molding machines.

  Further, the basic configuration of the injection molding machine, that is, the injection device and the mold clamping device are not limited to the above-described embodiment, and a known configuration can be adopted. For example, the present invention can be applied to various horizontal molding machines and tie barless molding machines that do not have a tie bar 36. The injection device is a screw type, and the clamping device is an electric motor direct pressure type or hydraulic type. There is no problem.

  That is, all matters in the above-described embodiments do not limit the present invention, and include all configurations that are not directly related to the present invention, according to the purpose and purpose of the claims. It can be changed arbitrarily.

3a Fixed side template 3b Movable side plate 5 Movable side platen 6 Intermediate plate 7 Fixed side platen 10 Injection nozzle 11 Seal member 11a Tapered surface 11b Pressure receiving surface 11c Restricting surface 11d Fitting hole 11e Tapered surface 13 Heating cylinder 14a, 14b Lock nut
15 Nozzle heater 16 Band heater 17 Nozzle thermocouple 18 Cylinder thermocouple 21 Jacket 33 Fixed side platen fitting hole 37 Cylindrical groove 39 Nozzle mounting hole 45 Contact surface

Claims (11)

A nozzle for injecting material;
A nozzle support member into which the tip of the nozzle is inserted and supported;
A seal member engaged between the nozzle and the nozzle support member;
The nozzle support member is provided with a nozzle support hole in which the tip side of the nozzle is inserted and supported with the seal member interposed therebetween,
The nozzle support hole includes an inclined surface corresponding to the outer peripheral surface of the nozzle, and an abutting surface provided on an opening peripheral edge on a side where the tip of the nozzle is inserted and abutted with an end of the seal member. A material injection device comprising:   2. The material injection apparatus according to claim 1, wherein the contact surface is formed by a surface along a direction in which the material is injected from the nozzle.   2. The contact surface is a surface that suppresses movement or deformation of the seal member by contacting an end portion of the seal member pressed between the nozzle and the nozzle support member. Or the material injection apparatus of 2.   The material injection apparatus according to any one of claims 1 to 3, wherein the nozzle support hole has a nozzle tip insertion hole through which a tip portion of the nozzle is inserted.   5. The material injection according to claim 4, wherein the seal member is provided with a nozzle insertion hole into which a tip end side of the nozzle is inserted, and the nozzle insertion hole and the nozzle tip insertion hole are discontinuous. apparatus.   The material injection apparatus according to claim 1, wherein the seal member is provided so as to surround an outer periphery of a tip portion of the nozzle.   In a state where the nozzle is inserted and supported by the nozzle support member with the seal member interposed therebetween, a space portion surrounded by the outer peripheral surface of the nozzle, the nozzle support hole, and the end portion of the seal member is provided. The material injection apparatus according to claim 1, wherein the material injection apparatus is provided.   An injection comprising: the material injection device according to any one of claims 1 to 7; and a mold connected to a material injection surface of the material injection device for molding an injection material. Molding machine. A nozzle connected to the tip of the heating cylinder and injecting a plasticized resin material into a cavity in the mold;
A nozzle support member that supports the nozzle and contacts the mold;
A seal member that fits between the outer periphery of the nozzle and the nozzle support member, a fitting hole that fits into the tip of the nozzle, and a tapered surface that faces the outer peripheral surface of the tapered nozzle. A pressure receiving surface for pressing the taper surface in a direction in close contact with the outer peripheral surface of the nozzle by the pressure of the resin material, and a cylindrical contact surface parallel to the central axis of the nozzle of the nozzle support member. A sealing member having a restriction surface that suppresses expansion of the outer diameter of the sealing member;
An injection molding machine comprising:   The fitting hole of the seal member is fitted to the upper part of the tip of the nozzle, and the nozzle support member has a fitting hole to be fitted to the lower part of the tip of the nozzle, and the fitting hole is the sealing member. The injection molding machine according to claim 9, wherein the injection molding machine is formed to be discontinuous with the fitting hole. Used in an injection molding machine that is connected to the tip of a heating cylinder and includes a nozzle that injects a plasticized resin material into a cavity in a mold, and a nozzle support member that supports the nozzle and contacts the mold. A sealing member,
A fitting hole that fits between the outer periphery of the nozzle and the nozzle support member and fits to the tip of the nozzle, a tapered surface that faces the outer peripheral surface of the tapered nozzle, and the tapered surface. The pressure-receiving surface for pressing in the direction in close contact with the outer peripheral surface of the nozzle by the pressure of the resin material and the cylindrical surface parallel to the central axis of the nozzle of the nozzle support member are fitted to the outer diameter of the seal member. Regulatory aspects to prevent expansion,
A sealing member comprising:

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