JP6347670B2 - Overmold container manufacturing equipment - Google Patents

Description

  The present invention relates to an overmolded container manufacturing apparatus for manufacturing an overmolded container having a two-layer structure in which a secondary piece is formed by injection molding on the surface of a resin-made primary piece.

  A method of manufacturing an overmolded container is used by placing a preformed cylindrical container-shaped primary piece in a mold and molding the secondary piece on the surface of the primary piece by injection molding. (See Patent Documents 1 and 2). At the time of injection molding, gas is supplied to the inside of the primary piece using a rod, so that a predetermined pressure is maintained by being pressurized. Thus, even when resin is injected onto the surface of the primary piece during injection molding, deformation of the primary piece is prevented.

  The gas supplied from the rod is circulated at a predetermined temperature after being pressurized, and the pressure is kept constant to prevent the deformation of the primary piece, and at the same time, a method of cooling at a constant temperature is used (patent) References 1 and 2).

JP2012-91421 JP2012-101486

  At the time of injection molding in a conventional overmold container manufacturing apparatus, the inside of the primary piece is cooled by circulating gas, and the temperature of the gas at this time is kept constant so as not to change. In order to perform injection molding, it is preferable to increase the temperature of the mold during injection molding and to decrease the temperature of the mold during cooling. However, in the conventional manufacturing apparatus, in order to prevent deformation of the primary piece, Since a constant temperature is maintained for the purpose of maintaining a constant pressure, it takes time to perform sufficient cooling, and if the temperature of the gas is lowered too much, poor gloss occurs during injection molding. There is a problem that it occurs. The conventional apparatus has a problem that a large apparatus (such as a large pump) is required to circulate the gas while keeping the pressure inside the primary piece constant. There is also a problem that energy consumption increases by operating for a long time.

  Therefore, in order to solve the above problems, the present invention provides an overmolded container that can be effectively cooled at the time of injection molding using a gas used for pressurization from the inside of the container when the overmolded container is manufactured. An object is to provide a manufacturing apparatus.

  The overmolded container manufacturing apparatus of the present invention is a manufacturing apparatus for a two-layered overmolded container in which a secondary piece is formed by injection molding on the surface of a hollow primary piece, and the primary piece is disposed inside. A mold for injecting the resin to be the secondary piece on the surface of the primary piece, and the inside of the primary piece is inserted from the mouth of the primary piece, and the primary piece is held in the mold. A supply means for supplying gas to the inside of the primary piece via the rod, and a discharge means for discharging the gas inside the primary piece to the outside via the rod; A supply source of gas, a supply path provided in the rod for supplying gas from the supply source, at least one supply opening connected to the supply path and provided on the surface of the rod, and the supply A supply valve provided between the source and the supply path, wherein the discharge means is a discharge path provided in the rod for discharging the gas inside the primary piece to the outside, the discharge A control means for controlling opening and closing of the supply valve and the discharge valve, and at least one discharge opening connected to the path and provided on the rod surface; and a discharge valve connected to the discharge path; Using the control means, before the injection molding, the discharge valve is closed, the supply valve is opened, and gas is supplied into the primary piece until a predetermined pressure is reached. The pressure is kept constant by closing the supply valve, and after injection molding, the discharge valve is opened, the gas inside the primary piece is discharged to the outside, and the molded piece is overloaded from inside the primary piece. Characterized by cooling the Rudo container.

  An orifice is provided between the discharge path and the discharge opening.

  Radiating fins are provided inside the discharge path.

  Alternatively, the discharge path is spirally formed inside the rod.

  Furthermore, a cooling passage connected to the discharge valve is provided in the mold, and after injection molding, gas is discharged from the discharge passage into the cooling passage.

  The overmolded container manufacturing apparatus of the present invention is a manufacturing apparatus for an overmolded container having a two-layer structure in which a secondary piece is formed by injection molding on the surface of a hollow primary piece, and on the surface of the primary piece, A mold for injecting resin as the secondary piece, a rod inserted into the inside of the mouth of the primary piece, and holding the primary piece in the mold, the primary through the rod A supply means for supplying a gas into the piece; and a discharge means for discharging the gas inside the primary piece to the outside. The supply means comprises a gas supply source, a supply path, at least one supply opening, and A supply valve, and the discharge means includes a discharge path, at least one discharge opening, and a discharge valve, and further includes control means for controlling opening and closing of the supply valve and the discharge valve. Using the control means, before the injection molding, the discharge valve is closed, the supply valve is opened, and gas is supplied into the primary piece until a predetermined pressure is reached. The injection valve is closed and the pressure is kept constant. After injection molding, the discharge valve is opened, the gas inside the primary piece is discharged to the outside, and the overmold after molding from inside the primary piece. By cooling the container, the temperature can be increased using adiabatic compression at the time of injection molding of the overmolded container, and after injection molding, it can be quickly cooled using adiabatic expansion, resulting in a high gloss appearance. Overmolded containers can be manufactured, reducing the molding time and eliminating the need for large equipment such as pumps used in conventional equipment. Down, resulting in the effect of energy saving.

  An orifice is provided between the discharge passage and the discharge opening, and a heat radiating fin is provided inside the discharge passage, or the discharge passage is spiral inside the rod. By being formed in a shape, it becomes possible to enhance the cooling effect, and further improve the quality of appearance and shorten the molding time.

  Furthermore, a cooling passage connected to the discharge valve is provided in the mold, and after the injection molding, gas is discharged from the discharge path to the cooling passage, thereby enabling cooling of the mold. By cooling the overmolded container after the injection molding from inside and outside, it is possible to further improve the quality of appearance and shorten the molding time.

It is sectional drawing of the orthogonal | vertical direction of the overmold container manufacturing apparatus of the 1st Embodiment of this invention. It is sectional drawing of the orthogonal | vertical direction of the overmold container manufacturing apparatus of the 1st Embodiment of this invention, and shows the state which shaping | molding of the overmold container was completed. It is sectional drawing of the horizontal direction of the location of the air intake opening of the rod of an overmold container manufacturing apparatus. It is sectional drawing of the horizontal direction of the location of the discharge opening of the rod of an overmold container manufacturing apparatus. It is sectional drawing of the orthogonal | vertical direction of the overmold container manufacturing apparatus of the 2nd Embodiment of this invention. It is sectional drawing of the orthogonal | vertical direction of the overmold container manufacturing apparatus of the 3rd Embodiment of this invention. It is sectional drawing of the orthogonal | vertical direction of the overmold container manufacturing apparatus of the 4th Embodiment of this invention.

  The overmold container manufacturing apparatus 1 of this invention is demonstrated in detail below using figures. FIG. 1 is a vertical sectional view of the overmold container manufacturing apparatus 1 of the first embodiment of the present invention, and FIG. 5 is a vertical sectional view of the overmold container manufacturing apparatus 1 ′ of the second embodiment. FIG. 6 is a vertical sectional view of the overmold container manufacturing apparatus 41 of the third embodiment, and FIG. 7 is a vertical sectional view of the overmold container manufacturing apparatus 41 ′ of the fourth embodiment.

  In the overmolded container manufacturing apparatus 1 according to the first embodiment of the present invention, as shown in FIG. 1, a primary piece 21 in the shape of a hollow container formed in advance is disposed inside with a predetermined distance from the inner surface. The mold 2 in which the resin to be the secondary piece 22 (see FIG. 2) is injected on the surface of the primary piece 21 is inserted into the mold from the mouth 23 of the primary piece 21, 2, a cylindrical rod 3 for holding the primary piece 21, a supply means 4 for supplying gas to the inside of the primary piece 21 through the rod 3, and the 1 through the rod 3. Discharge means 5 for discharging the gas inside the next piece 21 to the outside is provided.

  The mold 2 can be divided into at least two in the vertical direction, and a gate portion 25 for injecting resin is provided in the center of the bottom surface. Further, an opening 24 in which the upper portion of the rod 3 and the mouth portion 23 of the primary piece 21 are disposed is provided at the center of the upper portion of the mold 2. The rod 3 has a substantially cylindrical shape, the bottom surface is formed flat so as to be in contact with the flat bottom of the primary piece 21, and the upper portion is in contact with the inner surface of the mouth portion 23 of the primary piece 21. Size and shape.

  The upper part of the rod 3 is composed of a plurality of parts. The rod 3 includes a main body 31, a mounting portion 32 that is attached to the mold 2, and the main body 31 is fitted inside, a cap portion 33 into which an upper portion of the main body 31 is inserted, and the cap portion 33. The fixing portion 34 is configured to be screw-engaged with the upper end of the main body 31 protruding from the fixing portion 34 and fix the cap portion 33. On the contact surface between the bottom surface of the cap portion 33 and the main body 31 and the contact surface between the inner surface of the cap portion 33 and the outer surface of the main body 31, a packing or a seal portion is provided to improve the sealing degree of the rod 3. Secured.

  The supply means 4 extends vertically in the rod 3 in order to supply gas from the supply source 7 to the inside of the primary piece and gas from the supply source 7 to the inside of the primary piece 21. A supply path 8 provided so as to be connected to the lower end of the supply path 8 and provided horizontally above the side surface of the rod 3, and the supply source 7 and the supply path 8. And a supply valve 10 provided therebetween.

  The discharge means 5 is provided so as to extend in the vertical direction to the center of the main body 31 of the rod 3 in order to discharge the gas inside the primary piece 21 to the outside. One discharge passage 11 that penetrates, a discharge opening 12 that is connected to the lower end of the discharge passage 11, is provided below the side surface of the rod 3 in the horizontal direction, and is located below the supply opening 9, and the discharge opening 12. An orifice 13 provided between the discharge passage 11 and a discharge valve 14 connected to the upper end of the discharge passage 11 and for discharging gas to the outside. The discharge valve 14 is connected to the discharge path 11 through the fixing portion 34 and the discharge pipe 16.

  As shown in FIG. 4, the four discharge openings 12 are provided radially at equal intervals with respect to the discharge path 11. The number and arrangement of the discharge openings 12 are not particularly limited. In the discharge opening 12, the diameter of the connecting portion with the discharge path 11 is narrowed to form the orifice 13.

  Further, as shown in FIG. 3, the supply path 8 is formed in the main body 31 and the cap portion 33 of the rod 3 so as to have an annular cross section surrounding the discharge path 11. The openings 9 extend horizontally from the supply path 8 to the outside of the rod 3, and four openings 9 are arranged at equal intervals on the side surface of the rod 3. The supply valve 10 is connected to the supply passage 8 provided on the side surface of the cap portion 33 via a connection portion 18 and a supply pipe 17.

  By opening and closing the supply valve 10 and the discharge valve 14, the gas is supplied to the inside of the primary piece 21 and discharged from the inside to the outside. Control means 15 for controlling opening and closing of the supply valve 10 and the discharge valve 14 is further provided.

  The method for controlling the supply valve 10 and the discharge valve 14 by the control means 15 is performed simultaneously with the description of the method for manufacturing the overmolded container 20. First, the rod 3 is inserted into the preformed primary piece 21. At this time, the bottom surface of the rod 3 and the flat bottom of the primary piece 21 are in contact with each other, and the upper side surface of the rod 3 is in contact with the inner surface of the mouth of the primary piece 21.

  Then, the primary piece 21 into which the rod 3 is inserted is disposed inside the mold 2. At this time, when the mold 2 has a structure that can be divided into two in the vertical direction, the mold 2 is divided into two, and after the primary piece 21 is arranged at a predetermined position, two The molds 2 divided into two are combined into one and fixed to each other. At this time, as shown in FIG. 1, the mouth 23 of the primary piece 21 is positioned in the opening 24, and the upper portion of the rod 3 is exposed upward from the opening 24. A predetermined space (the thickness of the secondary piece 22) is formed between the surface of the primary piece 21 and the inner surface of the mold 2.

  Thus, after the primary piece 21 is arranged in the mold 2 and before the injection molding of the secondary piece 22 is performed, the discharge valve 14 is closed by the control means 15 and the supply valve 10 is opened, and gas is supplied from the supply opening 9 to the inside of the primary piece 21 through the supply pipe 17 and the supply path 8 by the supply source 7. Then, the gas supply is continued until a predetermined pressure (a pressure at which the primary piece 21 can be pressurized from the inside during injection molding to prevent deformation) is reached, and when the predetermined pressure is reached, the supply valve 10 To close the gas supply.

  When the inside of the primary piece 21 is pressurized, the temperature of the gas supplied from the supply opening 9 to the inside of the primary piece 21 is increased by adiabatic compression. By appropriately setting the supply source 7 and managing the temperature inside the primary piece 21, the inside of the primary piece 21 can be set to a temperature suitable for injection molding.

  In this manner, when the inside of the primary piece 21 reaches a predetermined pressure and temperature, the discharge valve 14 and the supply valve 10 are kept closed, and the mold 2 is moved from the gate portion 25. The resin is injected into the interior of the mold, and the secondary piece 22 is injection-molded between the surface of the primary piece 21 and the inner surface of the mold 2. At this time, since the temperature inside the primary piece 21 is increased, the injection molding of the secondary piece 22 is performed at an appropriate temperature.

  As soon as the injection molding of the secondary piece 22 is completed, the discharge valve 14 is opened by the control means 15 and the gas inside the primary piece 21 is discharged to the outside. At this time, the discharged gas is sent from the discharge opening 12 to the discharge passage 11 through the orifice 13 and then discharged to the outside through the discharge pipe 16 and the discharge valve 14. The supply valve 10 is in a reduced pressure state.

  At this time, the gas inside the primary piece 21 is released from the pressurized state, thereby causing adiabatic expansion and lowering the temperature. As a result, the primary piece 21 is cooled from the inside. Thereby, the overmolded container 20 after the injection molding is quickly cooled from the inside, the quality of the overmolded container 20 is improved, and the overmolded container 20 having a high gloss appearance can be manufactured. The gas inside the primary piece 21 is accelerated by being sent to the narrow discharge path 11 and further passing through the orifice 13 at that time, so that the cooling effect is enhanced.

  When the discharge valve 14 is opened, the supply valve 10 is closed, but in order to enhance the cooling effect, after the discharge of the gas inside the primary piece 21 is started, the control means 15 causes the supply valve 10 to It is also possible to open 10 and supply additional gas into the primary piece 21. In this case, since the purpose is to promote the discharge of the gas inside the primary piece 21, the purpose is not to keep the pressure inside the primary piece 21 constant but to circulate the gas. It is not a state.

  In this way, when the overmolded container 20 after the molding is sufficiently cooled and the overmolded container 20 is removed from the mold 2, the production of the overmolded container 20 is completed.

  The overmolded container manufacturing apparatus 1 of the present invention controls the supply and discharge of gas to the inside of the primary piece 21 to increase the temperature inside the primary piece 21 at the time of injection molding. Later, by quickly reducing and cooling, it becomes possible to appropriately perform the temperature control necessary for injection molding of the overmold container, and the molding time is shortened. In addition, an overmolded container having a high gloss appearance can be realized by performing sufficient cooling during molding. Furthermore, since the gas supply can be performed in a shorter time than in the past, a large pump as in the prior art becomes unnecessary, and the cost of the entire manufacturing apparatus can be reduced and energy saving can be realized.

  Next, an overmolded container manufacturing apparatus 1 ′ according to the second embodiment will be described. The overmolded container manufacturing apparatus 1 ′ of the second embodiment uses a radiating fin 26 for the discharging means 5 ′. Therefore, the same reference numerals are used for members having the same structure as the overmolded container manufacturing apparatus 1 of the first embodiment, and detailed description thereof is omitted.

  As shown in FIG. 5, the overmolded container manufacturing apparatus 1 ′ of the second embodiment has a primary piece 21 disposed inside with a predetermined distance from the inner surface, A mold 2 in which a resin to be the next piece 22 is injected, a cylindrical rod 3 for holding the primary piece 21 in the mold 2, and the primary piece 21 through the rod 3. A supply means 4 for supplying gas and a discharge means 5 ′ for discharging the gas inside the primary piece 21 to the outside through the rod 3 are provided. Further, the overmold container manufacturing apparatus 1 ′ includes a control means 15 for controlling opening and closing of the supply valve 10 and the discharge valve 14.

  The rod 3 includes a main body 31, a mounting part 32, a cap part 33, and a fixing part 34. The rod 3 is inserted into the primary piece 21 and is in contact with the bottom surface of the rod 3 and the flat bottom of the primary piece 21, and the upper side surface of the rod 3 is the mouth of the primary piece 21. It arrange | positions in the said metal mold | die 2 in the state which contact | connected the inner surface of the part.

  The supply means 4 is connected to a supply source 7 for supplying gas, a supply path 8 having an annular cross section provided so as to extend in the rod 3 in the vertical direction, and a lower end of the supply path 8. 3, four supply openings 9 provided radially equidistantly above the side surface, the supply valve 10 for opening and closing the supply of gas to the supply path 8, and the supply valve 10 and the A supply pipe 17 that connects the supply path 8 is provided, and the supply pipe 17 and the supply path 8 are connected to each other via a connection portion 18.

  The discharge means 5 ′ is a discharge passage 11 ′ provided to extend vertically to the center of the main body 31 in the rod 3 in order to discharge the gas inside the primary piece 21 to the outside. Four discharge openings 12 connected to the lower end of the discharge passage 11 ′ and provided radially at equal intervals in the horizontal direction below the side surface of the rod 3, located below the supply opening 9, the discharge openings 12 and the An orifice 13 provided between the discharge passage 11 ′ and the discharge valve 14 connected to the discharge passage 11 ′ and for discharging gas to the outside. The discharge valve 14 is connected to the upper end of the fixed portion 34 of the discharge path 11 ′ via a discharge pipe 16.

  In the present embodiment, a radiation fin 26 extending in the vertical direction is provided in the discharge path 11 ′, and the gas passing through the discharge path 11 ′ is further cooled by the radiation fin 26. The heat radiating fin 26 includes an engaging portion 27 positioned at the lower end, a plurality of substantially disk-shaped fins 28, a base portion 29 positioned at the upper end, and a passage 30 formed so as to extend vertically in the base portion 29. Have

  The radiating fin 26 is inserted into the discharge path 11 'from above, and the engaging portion 29 is inserted and fixed in a recess 36 provided on the bottom surface of the discharge path 11'. At this time, since the base 29 is in contact with the inner surface of the discharge path 11 ′, the discharge path 11 ′ is closed by the base 29, but the gas that has passed through the discharge path 11 ′ passes through the passage 30. It passes through the inside and is sent to the discharge pipe 16. The material of the heat radiating fins 26 is preferably a material having excellent thermal conductivity, such as Al, Cu. Moreover, the shape of the fin 28 is not particularly limited, but may be any shape that increases the heat transfer area.

  The control method of the supply valve 10 and the discharge valve 14 by the control means 15 in the present embodiment is the same as that of the first embodiment, and before the injection molding of the secondary piece 22, the control means 15 The exhaust valve 14 is closed, the supply valve 10 is opened, gas is supplied until the inside of the primary piece 21 reaches a predetermined pressure, and when the predetermined pressure is reached, the supply valve 10 is closed to supply gas. Stop. At this time, the temperature inside the primary piece 21 is rising.

  With the discharge valve 14 and the supply valve 10 closed, the secondary piece 22 is injection molded. Immediately after the injection molding of the secondary piece 22, the discharge valve 14 is opened by the control means 15 to discharge the gas inside the primary piece 21 to the outside. At this time, the discharged gas is sent from the discharge opening 12 to the discharge path 11 ′ through the orifice 13. At this time, the gas in the primary piece 21 is released from the pressurized state, thereby causing adiabatic expansion, the temperature of the gas is lowered, and the interior of the primary piece 21 is cooled.

  Further, the gas passing through the discharge path 11 ′ is deprived of heat by the heat radiating fins 26, so that the temperature is further lowered and a further cooling effect is produced. As described above, in the overmolded container manufacturing apparatus 1 ′ of the present embodiment, the cooling by the heat radiation fins 26 is performed in addition to the cooling utilizing the adiabatic expansion, so that the overmolded container 20 after the injection molding can be cooled more quickly. Therefore, the molding time can be further shortened, and the gloss of the appearance of the overmolded container is increased and the quality is improved.

  Next, the overmolded container manufacturing apparatus 41 of the third embodiment will be described. The overmold container manufacturing apparatus 41 of the third embodiment uses a spiral discharge path for the purpose of enhancing the cooling effect by lengthening the path for discharging gas to the outside. Therefore, the same reference numerals are used for members having the same structure as the overmolded container manufacturing apparatus 1 of the first embodiment, and detailed description thereof is omitted.

  In the overmolded container manufacturing apparatus 41 of the third embodiment, as shown in FIG. 6, the primary piece 21 is disposed inside with a predetermined distance from the inner surface, and the secondary piece is formed on the surface of the primary piece 21. A mold 2 in which a resin to be a piece 22 is injected, a cylindrical rod 3 ′ for holding the primary piece 21 in the mold 2, and the interior of the primary piece 21 through the rod 3 ′ Supply means 4 ′ for supplying gas to the gas and exhaust means 45 for discharging the gas inside the primary piece 21 to the outside via the rod 3 ′. Further, the overmold container manufacturing apparatus 41 includes control means 15 for controlling the opening and closing of the supply valve 10 and the discharge valve 14.

  The rod 3 ′ includes a main body 31 ′, an attachment part 32, a cap part 33, a fixing part 34, and a center part 37 inserted into the main body 31 ′. The rod 3 ′ is inserted into the primary piece 21, is in contact with the bottom surface of the rod 3 and the flat bottom of the primary piece 21, and the upper side surface of the rod 3 ′ is the primary piece 21. It is disposed in the mold 2 in contact with the inner surface of the mouth portion.

  The supply means 4 ′ includes a supply source 7 for supplying gas, a supply path 8 ′ provided so as to extend vertically in the center of the core portion 37 and the main body portion 31 ′ of the rod 3 ′, Four supply openings 9 connected to the lower end of the supply path 8 ′ and provided radially at equal intervals below the side surface of the rod 3 ′, for opening and closing the supply of gas to the supply path 8 ′ The supply valve 10 and a supply pipe 17 that connects the supply valve 10 and the supply path 8 ′ are provided. The supply pipe 17 and the supply path 8 ′ are connected via the fixing portion 34. The supply path 8 ′ penetrates the center of the core portion 37 of the main body portion 31 ′ in the vertical direction, the upper end thereof is connected to the passage of the fixing portion 34, and the lower end thereof is connected to the main body portion 31 ′. It is connected to the remaining part of the supply path 8 'provided at the lower part.

  The discharge means 45 is connected to two discharge passages 46 spirally provided in the rod 3 ′ for discharging the gas inside the primary piece 21 to the outside, and the lower end of the discharge passage 46. Two discharge openings 48 positioned above the supply opening 9 ′ and an orifice 47 provided between the discharge opening 48 and the discharge path 46 so as to face the lower side of the rod 3 in the horizontal direction. And the exhaust valve 14 connected to the exhaust passage 46 and exhausting gas to the outside. The discharge valve 14 is connected to the discharge passage 46 via the discharge pipe 16, and the connection between the discharge passage 46 and the discharge pipe 16 is made by a connection portion 18 provided on a side surface of the cap portion 33. Done.

  The spiral discharge path 46 is two spiral grooves formed on the side surface of the central core portion 37, and when the central core portion 37 is inserted into the main body portion 31 ′, the main body portion When the inner surface of 31 ′ is in contact with the outer surface of the core portion 37, the spiral groove becomes the discharge passage 46, and the lower end of the spiral groove is connected via the discharge opening 48 and the orifice 47. Is done.

  The center core portion 37 has a diameter that is narrower than the upper end of the spiral groove. When the center core portion 37 is inserted into the main body portion 31 ′, the main body portion 31 ′. Between the inner surface of the inner core portion 37 and the outer surface of the core portion 37 and the inner surface of the cap portion 33 to form an annular space, and the upper ends of the two spiral discharge passages 4 are one annular space. After that, it is connected to the discharge pipe 16 via the connecting portion 18. The method of forming the discharge passage 46 in a spiral shape is not particularly limited, and the number thereof can be changed.

  The control method of the supply valve 10 and the discharge valve 14 by the control means 15 in the overmold container manufacturing apparatus 41 of the present embodiment is the same as in the first and second embodiments, and detailed description thereof is omitted. Immediately after injection molding of the secondary piece 22, when the discharge valve 14 is opened by the control means 15 and the gas inside the primary piece 21 is discharged to the outside, the discharged gas is discharged from the discharge opening 48. To the spiral discharge path 46 through the orifice 47. At this time, the gas inside the primary piece 21 is released from the pressurized state, thereby causing adiabatic expansion and lowering the temperature. As a result, the inside of the primary piece 21 is cooled, Since the discharge path 46 is spiral, the gas discharge path becomes longer and the cooling effect is increased.

  Next, an overmolded container manufacturing apparatus 41 'according to the fourth embodiment will be described. The overmolded container manufacturing apparatus 41 ′ of the fourth embodiment uses a mold 2 ′ in which cooling means is newly provided in the mold 2 of the overmolded container manufacturing apparatus 41 of the third embodiment. For this reason, since the same structure as that of the overmolded container manufacturing apparatus 41 of the third embodiment is used except for the mold 2 ′, the metal mold of the overmolded container manufacturing apparatus 41 ′ of the fourth embodiment is used here. The explanation will be focused on the mold 2 '.

  As shown in FIG. 7, the overmold container manufacturing apparatus 41 of the present embodiment has a mold 2 ′ in which a resin that becomes the secondary piece 22 is injected on the surface of the primary piece 21, and the mold 2 ′ in the mold 2 ′. A cylindrical rod 3 ′ for holding the primary piece 21, supply means 4 ′ for supplying gas to the inside of the primary piece 21 via the rod 3 ′, and via the rod 3 ′ A discharge means 45 for discharging the gas inside the primary piece 21 to the outside is provided. Further, the overmold container manufacturing apparatus 41 includes control means 15 for controlling the opening and closing of the supply valve 10 and the discharge valve 14.

  In the present embodiment, a cooling passage 51 and a cooling water hole 52 are provided as cooling means inside the mold 2 ′. The cooling passage 51 is connected to the discharge valve 14 by an air supply pipe 50, and in the above-described embodiments, gas that has been discharged from the discharge valve 14 to the outside is transferred to the mold using the cooling passage 51. After passing 2 'inside, it is discharged outside. At this time, the gas passing through the cooling passage 51 is in a cooled state when discharged from the inside of the primary piece 21, and after being used for cooling from the inside of the primary piece 21, the cooling By passing through the passage 51, the mold 2 'is cooled, and at the same time, the overmold container 20 held by the mold 2' is cooled from the outside, and the cooling effect after injection molding is further And the molding time can be shortened.

  The cooling passage 51 is branched into a plurality of parts inside the mold 2 ′, and the gas passes through the mold 2 ′ and is discharged to the outside while being branched by the cooling passage 51. The shape and arrangement of the cooling passage 51 are not particularly limited as long as the gas discharged from the discharge valve 14 can pass through the mold 2 ′ appropriately. Further, the cooling water hole 52 provided in the mold 2 ′ is provided in the mold 2 ′ so as to surround the overmold container 20, and the mold 2 ′ is allowed to pass through the cooling water. Thus, the mold 2 'is cooled more effectively. The shape and arrangement of the cooling water holes 52 are not particularly limited, and various forms are possible.

  As described above, the overmold container manufacturing apparatus 41 ′ of the present embodiment uses the gas discharged from the primary piece 21 after injection molding to cool not only from the inside of the overmold container 20, but also from the outside. By doing so, it is possible to cool more reliably, which is effective in improving the quality of the overmolded container 20. The cooling means described here can be applied not only to the third embodiment but also to the first and second embodiments.

DESCRIPTION OF SYMBOLS 1,1 'Overmold container manufacturing apparatus 2,2' Mold 3 Rod 4 Supply means 5 Discharge means 7 Supply source 8 Supply path 9 Supply opening 10 Supply valve 11, 11 'Discharge path 12 Discharge opening 13 Orifice 14 Discharge valve 15 Control means 16 Discharge pipe 17 Supply pipe 18 Connection part 20 Overmold container 21 Primary piece 22 Secondary piece 23 Opening part 24 Opening part 25 Gate part 26 Radiation fin 27 Engagement part 28 Fin 29 Base part 30 Passage 31 Main body 32 Attachment part 33 Cap part 34 Fixing part 36 Concave part 37 Core part 41, 41 'Overmold container manufacturing apparatus 45 Discharge means 46 Discharge path 47 Orifice 48 Discharge opening 50 Air supply pipe 51 Cooling passage 52 Cooling water hole

Claims (4)

An apparatus for producing an overmolded container having a two-layer structure in which a secondary piece is molded by injection molding on the surface of a hollow primary piece,
A mold in which the primary piece is disposed inside, and a resin to be the secondary piece is injected on the surface of the primary piece;
A rod inserted into the inside of the mouthpiece of the primary piece and holding the primary piece in the mold;
Supply means for supplying gas into the primary piece through the rod; and
A discharge means for discharging the gas inside the primary piece to the outside through the rod;
The supply means includes a gas supply source, a supply path provided in the rod for supplying gas from the supply source, and at least one of the supply means connected to the supply path and provided at an upper portion of a side surface of the rod. A supply opening, and a supply valve provided between the supply source and the supply path,
The discharge means is connected to the discharge path provided in the rod for discharging the gas inside the primary piece to the outside, and is provided at a lower portion of the side surface of the rod than the supply opening. At least one discharge opening located below , and a discharge valve connected to the discharge path,
An orifice is provided between the discharge passage and the discharge opening;
It further comprises control means for controlling opening and closing of the supply valve and the discharge valve, and using the control means,
Before injection molding, close the discharge valve, open the supply valve and supply gas inside the primary piece until a predetermined pressure is reached,
During injection molding, close the discharge valve and the supply valve to keep the pressure constant,
After injection molding, the discharge valve is opened, the gas inside the primary piece is discharged to the outside, and the overmolded container after molding is cooled from the inside of the primary piece. apparatus. The overmold container manufacturing apparatus according to claim 1 , wherein a radiation fin is provided inside the discharge path. The overmold container manufacturing apparatus according to claim 1 , wherein the discharge path is spirally formed inside the rod. The cooling passage connected with the said discharge valve is provided in the said metal mold | die, Gas is discharged | emitted from the said discharge passage to the said cooling passage after injection molding, The any one of Claims 1-3 characterized by the above-mentioned. The overmolded container manufacturing apparatus according to the item.