JP3789014B2 - Molding machine having neckpiece insert device and preform molding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a molding machine having a neckpiece insert device for injection-molding a preform by inserting a neckpiece into a neck cavity mold, and a preform molding method.
[0002]
[Background Art and Problems to be Solved by the Invention]
  For example, a container obtained by biaxial stretch blow molding of a preform injection-molded with polyethylene terephthalate (PET) or the like is widely used.
[0003]
  In order to injection-mold a preform used for molding such a container, at least an injection cavity mold that defines the outer wall of the preform and an injection core mold that defines the inner wall of the preform are required.
[0004]
  Further, after the injection cavity mold and the injection core mold are clamped and the preform is injection-molded, it is necessary to cool the preform to a temperature at which the mold can be released while maintaining the clamped state.
[0005]
  Conventionally, since the mold release temperature of the preform has to be sufficiently lowered, the injection molding cycle time is increased and the production efficiency is deteriorated.
[0006]
  Therefore, the applicant of the present application has previously proposed an injection molding machine shown in International Publication WO95 / 03930.
[0007]
  This injection molding machine includes an injection molding part for molding a preform, an extraction part for taking out the preform, an injection core mold and a neck cavity mold arranged in each part of the injection molding part and the extraction part. The injection core mold, the neck cavity mold, and the injection cavity mold disposed in the injection molding section are each provided with a cooling function.
[0008]
  And by cooling and taking out the preform at the injection molding part and take-out part, it is possible to shorten the injection molding cycle time and improve the production efficiency while ensuring sufficient cooling time for the preform. ing.
[0009]
  By the way, when the container obtained by biaxial stretching blow molding of this injection-molded preform is used as a beverage container, the body portion is biaxially stretched and thus has high heat resistance and mechanical strength. However, since the neck portion on the opening side is not biaxially stretched, it is inferior in terms of heat resistance and mechanical strength.
[0010]
  Therefore, a neck piece corresponding to the neck portion of the container is separately molded as having heat resistance and mechanical strength, inserted into the neck cavity mold, and a preform having the neck piece integrally formed by injection molding. It has been broken.
[0011]
  It is an object of the present invention to have a neckpiece insert device that can insert a neckpiece into a neck cavity mold and injection-mold a preform without increasing the injection molding cycle time and maintaining production efficiency. An object of the present invention is to provide a molding machine and a preform molding method.
[0012]
  Another object of the present invention is to provide a molding machine having a neckpiece insert device and a method for molding a preform, which can align a neckpiece with a simple structure and operation with respect to a neck cavity mold having a predetermined pitch. .
[0013]
[Means for Solving the Problems]
  In order to achieve the above object, an invention according to claim 1 includes an injection molding part for molding a preform,
  An extraction portion for taking out the preform;
  In a molding machine having at least two sets of injection core molds arranged in each part and a conveying member that conveys a neck cavity mold to each part,
Having an insert device for placing a neckpiece into the neck cavity mold;
  The insert device isAt a position corresponding to the injection core mold and the neck cavity mold stopped at the take-out portionBe placedIt is characterized by that.
[0014]
  According to the present invention, by providing an insert device at a position corresponding to the stopped injection core mold and neck cavity mold at the take-out portion for taking out the preform, the preform is taken out and the mold is opened in the neck cavity mold. The neckpiece can be inserted securely, and the neckpiece insertion is performed while the neck cavity mold is opened for removing the preform, which may affect the injection molding cycle time. The injection molding cycle time and production efficiency can be maintained.
[0015]
  The invention according to claim 2In claim 1,
The insert device includes a supply holding member that holds the neckpiece,
The supply holding member is formed in a cylindrical shape through which the injection core mold can be inserted. According to the present invention, the supply holding member is formed into a cylindrical shape, and the neck piece is placed on the cylindrical supply holding member, so that the neck piece can be connected to the neck without disturbing the injection core mold. The cavity-type neckpiece holding position can be reliably supplied.
Invention of Claim 3 is set in Claim 2,
  The injection molding part and the take-out part each include a plurality of the injection core molds and the neck cavity molds that simultaneously mold a plurality of the preforms, respectively.
  The supply holding member isHolds the plurality of neck pieces arranged at the pitch of the plurality of neck cavity molds arranged in the take-out portionAnd
The insert device isAnd a lifting mechanism that lifts and lowers the supply holding member from a standby position lower than a lower end of the injection core mold to an opening / closing position of the neck cavity mold.
[0016]
  According to the present invention, a plurality of neck pieces corresponding to the number of neck cavity molds can be supplied to the neck cavity mold by the plurality of supply holding members, and the supply holding member is made of the injection core mold by the lifting mechanism. Since it is raised / lowered from a position lower than the lower end to the opening / closing position of the neck cavity mold, the supply holding member can be raised / lowered without interfering with the injection core mold.
[0017]
  Claim4The described invention is claimed.3In
  The preform includes a neck portion, a trunk portion, and a bottom portion, and the neck portion includes an open mouth portion, and a reverse taper portion whose trunk diameter increases toward the bottom portion below the mouth portion toward the bottom portion,
  The neck cavity mold has a mouth forming cavity surface and a reverse taper forming cavity surface having shapes corresponding to the shapes of the mouth and the inverse taper portion.And
in frontThe elevating mechanism moves the neck piece held by the supply holding member beyond the reverse tapered portion forming cavity surface position at the position where the neck cavity mold is in an open state, and the upper mouth forming cavity surface position. Up to the above, it is possible to raise between the injection core mold and the neck cavity mold.
[0018]
  According to the present invention, the supply holding member is formed in a cylindrical shape, and the neck piece is placed on the cylindrical supply holding member, so that the neck does not interfere with the injection core mold or the neck cavity mold. The piece can be reliably fed beyond the reverse taper forming cavity surface to the mouth forming cavity surface position.
[0019]
[0020]
[0021]
[0022]
[0023]
  Claim5The described invention uses an injection core mold and a neck cavity mold in the injection molding section.TheAn injection molding process for injection molding the preform;
  A transporting step in which the preform injection-molded in the injection-molding part is held by the injection core mold and the neck cavity mold and is circulated and transported to the take-out part by a transporting means;
  An extraction step of extracting the preform circulated and conveyed to the extraction portion from the injection core mold and the neck cavity mold,
  A neck piece inserting step of inserting the neck piece into the neck cavity mold;
  In a preform molding method including:
  The neckpiece insert process,
in frontNeckpieceFormed in a cylindrical shape that can be inserted through the injection core moldA delivery process of receiving and delivering to the supply holding member by the receiving holding member;
  The neck piece held by the supply holding member is raised upward from the standby position lower than the lower end of the injection core mold to the neck cavity mold in the mold open state, and the neck piece is moved to the neck piece holding position of the neck cavity mold. An arrangement process to arrange;
  A holding step of closing the neck cavity mold and holding the neck piece by the neck cavity mold in a state where the neck piece is disposed at the neck piece holding position;
  It is characterized by including.
[0024]
  According to the present invention, the neck piece is aligned with the alignment holding member at a predetermined pitch of the neck cavity mold, the aligned neck piece is transferred to the supply holding member via the delivery holding member, and the mold is formed by the supply holding member. By placing the neck piece in the neck piece holding position of the neck cavity mold in the open state and closing the neck cavity mold, the neck piece can be reliably inserted into the neck cavity mold that has been removed from the preform and opened. it can. In addition, the neckpiece insert is performed while the neck cavity mold is opened for removing the preform, so that the injection molding cycle time is not affected and the injection molding cycle time and production efficiency are maintained. Can be done in the state.
[0025]
[0026]
[0027]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0028]
  FIGS. 1-7 is a figure which shows the molding machine which has the neckpiece insert apparatus which concerns on one embodiment of this invention.
[0029]
  FIG. 1 is a side view of a molding machine according to the present embodiment. An injection device 12 is disposed on a machine base 10 shown in the figure, and injection molding is performed at a position facing the injection device 12. A portion 14 is provided, and an extraction portion 16 is provided at a position opposite to the injection device 12 of the injection molding portion 14.
[0030]
  A lower mold clamping plate 18 fixed on the machine base 10 is provided below the injection molding unit 14. For example, a circular upper mold clamping plate 20 is disposed above the lower mold clamping plate 18 over the installation range of the injection molding unit 14 and the take-out unit 16. The upper mold clamping plate 20 is fixed to four tie bars 22 provided through the lower mold clamping plate 18 at four locations around the injection molding portion 14, and the tie bars 22 are provided in the machine base 10. The upper mold clamping plate 20 is driven up and down by moving by driving a mold clamping drive device (not shown).
[0031]
  On the lower surface of the upper mold clamping plate 20, there is provided a turntable 26 that is intermittently rotated by 180 ° by a rotary actuator 24 fixed to the upper mold clamping plate 20. Two rows of injection core molds 28 and neck cavity molds 30 are supported on the lower surface of the turntable 26 at positions corresponding to the injection molding sections 14 and the extraction sections 16. The injection core mold 28 and the neck cavity mold 30 have, for example, 8 pieces in each row corresponding to the number of molding simultaneously.
[0032]
  The injection core molds 28 in each row are supported by an injection core presser plate 32 fixed to the lower surface of the rotating plate 26 and an injection core fixing plate 34 fixed to the lower surface of the injection core presser plate 32.
[0033]
  The neck cavity mold 30 in each row is composed of a pair of split molds, and in each row, the pair of split molds are fixed to a neck cavity mold fixing plate 36 formed of a split plate.
[0034]
  The neck cavity mold fixing plate 36 is biased in the closing direction by a biasing means (not shown).
[0035]
  Further, on the upper surface side of the neck cavity mold fixing plate 36, an eject plate 38 for releasing the preform from the injection core mold 28 by pressing the neck cavity mold fixing plate 36 downward is disposed.
[0036]
  A hot runner mold 40 that nozzle-touches the injection device 12 is provided below the injection molding portion 14, and an injection cavity mold 42 is fixed to the upper portion of the hot runner mold 40. The injection cavity mold 42 has, for example, eight cavities 2 corresponding to the number of simultaneous moldings in the injection molding section 14 (see FIG. 3).
[0037]
  Then, a mold clamping drive device (not shown) is driven, and the tie bar 22 drives the upper mold clamping plate 18 to descend, and the rotary plate 26, the injection core presser plate 32, and the injection core fixing plate supported by the upper mold clamping plate 18 are driven. 34, the injection core mold 28 and the neck cavity mold 30 are driven downward together with the neck cavity mold fixing plate 36 and the eject plate 38, and are clamped with respect to the injection cavity mold 42. In this state, by injecting a resin material into each cavity of the injection cavity mold 42 from the injection device 12 through the hot runner mold 40, the number of simultaneous moldings, for example, eight preforms 1 is injection molded. ing.
[0038]
  The preform 1 injection molded by the injection molding unit 14 is cooled by the injection cavity mold 42, the injection core mold 28 and the neck cavity mold 30, and then the upper mold clamping plate 20 is raised to raise the injection cavity mold. The mold is released from 42, and is conveyed to the take-out section 16 while being held by the injection core mold 28 and the neck cavity mold 30 by the rotation of the turntable 26.
[0039]
  The take-out portion 16 includes an eject cylinder 44 for lowering the eject plate 38 on the upper mold clamping plate 20 and a neck cavity mold opening cylinder for opening a neck cavity mold 30 comprising a split mold via a neck cavity mold fixing plate 36. 46 is fixed. Then, after the preform is conveyed and stopped by the take-out portion 16 while being held by the injection core mold 28 and the neck cavity mold 30 by the turntable 26, the eject plate 38 is driven downward by the drive of the eject cylinder 44. By lowering the mold fixing plate 36, the preform holding the neck portion 3 in the neck cavity mold 30 is lowered and released from the injection core mold 28. Next, the neck cavity mold 30 comprising the split mold is opened through the neck cavity mold fixing plate 36 by driving the neck cavity mold opening cylinder 46, and the preform 1 is taken out from the injection core mold 28 and the neck cavity mold 30. It has become.
[0040]
  A discharge mechanism 48 for discharging the extracted preform 1 is provided below the extraction portion 16.
[0041]
  The discharge mechanism 48 includes a bottom holding member 50 that holds the bottom of the removed preform, a preform pressing plate 52, and a discharge belt 54.
[0042]
  The bottom holding member 50 has a simultaneous molding number, for example, eight along the arrangement direction of the neck cavity mold 30, and is raised to the receiving position of the preform 1 by the fourth elevating cylinder 56 (FIG. 6 (1)). (Refer to FIG. 6 (2)). It is possible to temporarily stop at the delivery position to the discharge belt 54 and then further descend to the lowest position.
[0043]
  The preform holding plate 52 is arranged along the direction in which the preforms 1 are arranged at the temporary stop position of the bottom holding member 50, and can support one side of the preform 1.
[0044]
  The discharge belt 54 is stretched in a horizontal direction between a pair of pulleys 56, and can be moved forward and backward together with the preform presser plate 52 with respect to the preform 1 by the discharge cylinder 58. The preform presser plate 52 and the discharge belt 54 The lower part of the neck part 3 of the preform 1 can be supported below the flange part 4. Further, the discharge belt 54 can be rotated forward and backward by a motor 60, and a good quality preform is carried out to the carry-out side in the direction of arrow A, for example, and defective inserts and trial hit preforms are brought into the discharge side in the direction of arrow B, for example. And can be discharged (see FIG. 3).
[0045]
  Then, as shown in FIGS. 2 and 3, an insert device for inserting the neck piece 62 into the neck cavity mold 30 in the mold open state where the preform 1 is taken out by the bottom holding member 50 of the discharge mechanism 48. 64 is provided corresponding to the position of the take-out portion 16.
[0046]
  Here, as shown in FIG. 6, the preform 1 is composed of a neck portion 5, a trunk portion 6, and a bottom portion 9, and the neck portion 5 has an open mouth portion 7, and a trunk portion that extends downward toward the bottom portion 9 below the mouth portion 7. And a reverse tapered portion 8 having a large diameter. Further, the neck cavity mold 30 has a mouth forming cavity surface 30 a and a reverse taper forming cavity surface 30 b having shapes corresponding to the shapes of the mouth 7 and the reverse taper 8.
[0047]
  The insert device 64 has an alignment mechanism 66, a delivery mechanism 68, and a supply mechanism 70.
[0048]
  The alignment mechanism 66 arranges an unscrambler 74 on a support column 72 provided at a side position of the machine base 10, and the neck piece 62 is vibrated and stirred by the unscrambler 74 to align the top and bottom of the neck piece 62. The neck piece 62 can be continuously supplied to the lower end of the supply rail 76 by the supply rail 76 inclined downward therefrom. As shown in FIG. 4, a stopper 80 urged in the closing direction by a spring 78 is provided at the lower end of the supply rail 76, and the neck piece 62 at the lowermost position is stopped by the stopper 80. Yes.
[0049]
  Below the lower end of the supply rail 76, a number of alignment holding members 82 corresponding to the number of simultaneously formed, for example, eight, are arranged at a pitch corresponding to the row pitch of the neck cavity die 30 along the arrangement direction of the neck cavity die 30 in one row. Is provided.
[0050]
  The alignment holding member 82 can be horizontally moved by a horizontal movement guide rail 84, and can be horizontally moved from a standby position C to a receiving position D by the delivery mechanism 68 by an alignment cylinder 86. Further, when the alignment holding member 82 moves from the standby position C to the receiving position D, the alignment holding member 82 is inserted into the neck piece 62 stopped by the stopper 80 from below.82Enters (see FIG. 4 (1)), pushes the stopper 80 open to receive the neck pieces 62 one by one (see FIG. 4 (2)), and aligns with the pitch of the neck cavity mold 30. .
[0051]
  The alignment holding member 82 can be moved up and down by a lifting guide rail 87 and can be moved up and down from the receiving position D to the retracted position E by a first lifting cylinder 88.
[0052]
  Accordingly, the neck piece 62 is received by the alignment holding member 82 and aligned with the pitch of the neck cavity mold 30 while the alignment holding member 82 is horizontally moved from the retracted position C to the receiving position D by the alignment cylinder 86. Next, after the delivery mechanism 68 receives the neck piece 62 at the receiving position D, the first elevating cylinder is moved from the receiving position to the retracted position E.88In this lowered state, the alignment holding member 82 is returned by the alignment cylinder 86 and is raised by the first elevating cylinder 88 to return to the standby position C.
[0053]
  The delivery mechanism 68 has the number of simultaneous forming members, for example, eight delivery holding members 92 at the pitch of the neck cavity mold 30 above the support column 90 erected on the machine base 10.
[0054]
  As shown in FIG. 5, each delivery holding member 92 normally biases a pair of holding pieces 94 by a spring 97 in the closing direction, and the upper end of the holding piece 94 is opened and closed by an opening / closing rod 98 of a delivery holding member opening / closing cylinder 96. The holding piece 94 is opened by pressing (see (1) in the figure), and the holding piece 94 is closed by releasing the pressing (see (2) in the same figure).
[0055]
  Further, the delivery holding member 92 can wait in a receiving position F where the neck piece 62 is received from the alignment holding member 82 with the holding piece 94 opened, and the holding piece 94 is held by the alignment holding member 82. When the neck piece 62 is transported to the receiving position, it has a top surface holding plate 102 with a spring 100 that holds the upper end of the neck piece 62, and the delivery holding member 92 holds the neck piece 62. The neck piece 62 can be positioned by the top surface pressing plate 102.
[0056]
  Further, each delivery holding member 92 is horizontally movable with respect to the support column 90 via the horizontal movement guide rail 104 so that the delivery cylinder 106 can horizontally move from the reception position F to the delivery upper position G to the supply mechanism 70 by the delivery cylinder 106. Has been.
[0057]
  Further, the delivery holding member 92 can be moved up and down with respect to the column 90 by the lifting guide rail 108, and can be moved up and down between the delivery upper position G and the delivery position H by the second lifting cylinder 110.
[0058]
  Accordingly, the delivery holding member 92 waits at the receiving position F while being opened by the delivery holding member opening / closing cylinder 96, and the neck piece 62 held by the alignment holding member 82 is conveyed to the receiving position F and stopped. , Delivery holding member opening and closing cylinder 96ByThe delivery holding member 92 is closed and the neck piece 62 is held. Next, when the alignment holding member 82 is lowered to the retracted position E, the delivery holding member 92 is horizontally moved from the receiving position F to the upper delivery position G by the delivery cylinder 106, and delivered by the second elevating cylinder 110 at the upper delivery position G. When the holding member 92 is lowered from the delivery upper position G to the delivery position H, and the delivery holding member 92 is opened by the delivery holding member opening / closing cylinder 96, the neck piece 62 is delivered to the supply mechanism 70.
[0059]
  The supply mechanism 70 has a number of supply holding members 112 corresponding to the number of simultaneous moldings, for example, 8 at the lower position of the support column 90 at the pitch of the neck cavity mold 30.
[0060]
  These supply holding members 112 can be moved horizontally with respect to the column 90 by the horizontal movement guide rail 114, and horizontally moved between the receiving position I of the neck piece 62 and the lower position J of the neck cavity mold 30 by the first supply cylinder 116. Have been able to.
[0061]
  Each supply holding member 112 can be moved up and down with respect to the support column 90 by a lifting rail 118, and can be moved up and down between a neck cavity mold lower position J and a neck cavity mold lower surface position K by a third lifting cylinder 120. Has been.
[0062]
  Further, the supply holding member 112 can be moved up and down between the neck cavity mold lower surface position K and the mouth forming cavity surface position L of the neck cavity mold 30 by the link mechanism 122 and the second supply cylinder 124.
[0063]
  Each of the supply holding members 112 is formed in a cylindrical shape into which the injection core mold 28 can be inserted, and a tapered mounting portion 126 that holds the lower portion of the neck piece 62 is formed at the upper end. Cavity mold 30 is openIn stateThe above-mentioned link between the injection core mold 28 and the neck cavity mold 30 extends from the neck piece 62 held by the supply holding member 112 to the position of the upper mouth forming cavity surface 30b beyond the position of the reverse tapered portion forming cavity surface 30b. The mechanism 122 and the second supply cylinder 124 can be raised.
[0064]
  Accordingly, the supply holding member 112 horizontally moves from the receiving position I where the neck piece 62 is received to the neck cavity mold lower position J by the first supply cylinder 116, and from the neck cavity mold lower position J by the third lifting cylinder 120. Ascend to the mold bottom surface position K (see FIG. 7 (1)), and further move up and down to the mouth forming cavity surface position L via the link mechanism 122 by the second supply cylinder 124, and the neck piece 62 is moved to the mouth forming cavity surface position. L can be arranged (see FIG. 7 (2)).
[0065]
  Next, a method for forming the preform 1 using the above-described molding machine will be described.
[0066]
  First, in the injection molding portion 14, a mold clamping drive device (not shown) is driven, and the tie bar 22 drives the upper mold clamping plate 20 downward, and the rotary plate 26, injection core presser plate supported by the upper mold clamping plate 20 are driven. 32, the injection core mold 28 and the neck cavity mold 30 are driven downward together with the injection core fixing plate 34, the neck cavity mold fixing plate 36 and the eject plate 38, and are clamped to the injection cavity mold 42.
[0067]
  In this state, a resin material is injected into each cavity of the injection cavity mold 42 from the injection device 12 through the hot runner mold 40, whereby the number of simultaneous moldings, for example, eight preforms 1 are injection molded.
[0068]
  Next, the preform 1 injection-molded by the injection molding unit 14 is cooled by the injection cavity mold 42, the injection core mold 28 and the neck cavity mold 30, and then the upper mold clamping plate 20 is lifted, whereby the injection cavity The mold is released from the mold 42 and is conveyed to the take-out section 16 while being held by the injection core mold 28 and the neck cavity mold 30 by the rotation of the rotating plate 26.
[0069]
  In the take-out section 16, the eject plate 38 is driven downward by driving the eject cylinder 44 in a state where the preform 1 is conveyed to the take-out section 16 and stopped by the turntable 26, and the neck cavity mold fixing plate 36 is lowered. , Neck cavity mold30Preform with neck 3 held1Is lowered and released from the injection core mold 28.
[0070]
  Next, when the neck cavity mold opening cylinder 46 is driven, the neck cavity mold 30 made of a split mold is opened through the neck cavity mold fixing plate 36 made of a divided plate, and the preform is formed from the injection core mold 28 and the neck cavity mold 30. 1 is taken out.
[0071]
  When the preform 1 is taken out from the neck cavity mold 30, the bottom holding member 50 is raised to the preform receiving position by the fourth elevating cylinder 56 to hold the preform bottom, and then delivered to the discharge belt 54. In this temporary stop position, the discharge belt 54 and the preform holding plate 52 are moved forward relative to the preform by the discharge cylinder 58, and the preform 1 is moved between the preform holding plate 52 and the discharge belt 54. The bottom of the flange 4 provided at the bottom of the neck 3 is supported.
[0072]
  Thereafter, the bottom holding member 50 is further lowered to the lowest position by the fourth elevating cylinder 56.
[0073]
  In this state, the carry-out belt 54 is rotated by the motor 60.SeraIf it is a preform of a product, it is carried out, for example, to the carry-out side in the direction of arrow A, and if it is a defective insert or a trial hit preform, it is discharged, for example, to the discharge side in the direction of arrow B.
[0074]
  Then, the neck piece 62 is inserted by the insert device 64 into the neck cavity mold 30 in the mold open state where the preform 1 is taken out by the bottom holding member 50.
[0075]
  In this insert device 64, first, the alignment holding member 82 is horizontally moved from the standby position C to the receiving position D by the alignment cylinder 86, and at the lower end position of the neck piece 62 continuously supplied from the unscrambler 74 to the supply rail 76, The stoppers 80 are pushed open by the alignment holding member 82 to sequentially receive the neck pieces 62 one by one, align with the pitch of the neck cavity mold 30, and stop moving to the receiving position D by the receiving position mechanism 68.
[0076]
  In the receiving mechanism 68, the delivery holding member 92 waits at the receiving position F with the delivery holding member opening / closing cylinder 96 opened, and the neck piece 62 held by the alignment holding member 82 is conveyed to the receiving position F and stopped. In this state, the delivery holding member 92 is closed by the delivery holding member opening / closing cylinder 96 to hold the neck piece 62.
[0077]
  Next, when the alignment holding member 82 is lowered to the retracted position E, the delivery cylinder 106 horizontally moves the delivery holding member 92 from the receiving position F to the delivery upper position G. At the delivery upper position G, the second elevating cylinder 110 is moved. Thus, the delivery holding member 92 is lowered from the delivery upper position G to the delivery position H, and the delivery holding member 92 is opened by the delivery holding member opening / closing cylinder 96 to deliver the neck piece 62 to the supply mechanism 70.
[0078]
  In the supply mechanism 70, the supply holding member 112 receives the neck piece 62 mounted on the mounting portion at the upper end, horizontally moves from the receiving position I to the neck cavity mold lower position J by the first supply cylinder 116, and the third The raising and lowering cylinder 120 moves up from the neck cavity mold lower position J to the neck cavity mold lower surface position K, and further rises to the mouth forming cavity surface position L through the link mechanism 122 by the second supply cylinder 124 and opens the neck piece 62. It arrange | positions in the part formation cavity surface position L. FIG.
[0079]
  In this case, the supply holding member 112 is an injection core typeTheSince the neck cavity mold 30 is in the open state, the neck piece 62 held by the supply holding member 112 is moved upwardly beyond the position of the reverse tapered portion forming cavity surface 30b. The gap between the injection core mold 28 and the neck cavity mold 30 is reliably raised to the position of the mouth forming cavity surface 30a.
[0080]
  Then, by closing the neck cavity mold 30 in this state, the neck piece 62 is surely inserted into the mouth forming cavity position of the neck cavity mold. If the neck cavity mold 30 is conveyed to the injection molding part 14 and injection molding is performed, the preform 1 having the neck piece 62 integrally formed is reliably molded.
[0081]
  The present invention is not limited to the above-described embodiment, and can be changed to various embodiments within the scope of the gist of the present invention.
[0082]
  For example, the case where the number of preforms simultaneously formed in the injection molding part is 8 has been described, but the number of preforms can be changed as necessary.
[0083]
  In this embodiment, the molding machine is a two-station molding machine including an injection molding station and a take-out station. However, a molding machine of a three-station or four-station type having a stop station may be used.
[0084]
[Brief description of the drawings]
FIG. 1 is a schematic side view of a molding machine having a neckpiece insert device according to an embodiment of the present invention.
FIG. 2 is a rear view of the molding machine shown in FIG.
3 is a plan view of the molding machine shown in FIGS. 1 and 2. FIG.
4 is a partial enlarged view of the alignment mechanism shown in FIGS. 1 to 3, in which (1) shows a state before neck piece alignment, and (2) shows an alignment start state. FIG.
5 is a partially enlarged view of the delivery mechanism of FIGS. 1 and 2, wherein (1) shows a state before the neck piece is held by the delivery holding member, and (2) shows a holding state.
6 is a partially enlarged view of the discharging mechanism shown in FIGS. 1 and 3, wherein (1) shows a state in which a preform is received by the bottom holding member, and (2) shows a state in which the bottom holding member is pushed onto the carry-out belt and the holding plate. Shows the status of delivery of the reform.
7 is a partially enlarged view of the supply mechanism of FIG. 1. (1) shows a state in which the neck piece is positioned on the bottom surface of the neck cavity mold, and (2) shows that the neck piece is necked by raising the supply holding member. The state where it is inserted to the position of the cavity forming mouth forming cavity surface is shown.
[Explanation of symbols]
  1 Preform
  3 neck
  4 Flange
  5 neck
  6 Torso
  7 mouth
  8 Reverse taper
  14 Injection molding part
  16 Extraction department
  26 Turntable
  28 Injection core type
  30 neck cavity type
  30a mouth forming cavity surface
  30b Cavity surface forming reverse taper
  42 Injection cavity mold
  62 Neckpiece
  64 Insert device
  66 Alignment mechanism
  68 Delivery mechanism
  70 Supply mechanism
  82 Alignment holding member
  86 Alignment cylinder
  88 First lifting cylinder
  92 Delivery holding member
  106 Delivery cylinder
  108 Lifting guide rail
  110 Second lifting cylinder
  112 Supply holding member
  116 First supply cylinder
  120 Third lifting cylinder
  122 Link mechanism
  124 Second supply cylinder
  126 Placement part

Claims (5)

An injection molding part for molding a preform;
An extraction portion for taking out the preform;
In a molding machine having at least two sets of injection core molds arranged in each part and a conveying member that conveys a neck cavity mold to each part,
Having an insert device for placing a neckpiece into the neck cavity mold;
The molding apparatus having a neckpiece insert device, wherein the insert device is disposed at a position corresponding to the injection core mold and the neck cavity mold stopped at the take-out portion. In claim 1,
  The insert device includes a supply holding member that holds the neckpiece,
  The molding machine having a neck piece insert device, wherein the supply holding member is formed in a cylindrical shape through which the injection core mold can be inserted. In claim 2 ,
The injection molding part and the take-out part each include a plurality of the injection core molds and the neck cavity molds that simultaneously mold a plurality of the preforms, respectively.
The supply holding member holds a plurality of the neck pieces arranged at a pitch of the plurality of neck cavity molds arranged in the take-out part ,
The insert apparatus includes a supply mechanism having a lifting mechanism that lifts and lowers the supply holding member from a standby position lower than a lower end of the injection core mold to an opening / closing position of the neck cavity mold. Having a molding machine. In claim 3 ,
The preform includes a neck portion, a trunk portion, and a bottom portion, and the neck portion includes an open mouth portion, and a reverse taper portion whose trunk diameter increases toward the bottom portion below the mouth portion toward the bottom portion,
It said neck cavity mold may have a mouth portion forming cavity surface and the reverse tapered portion forming a cavity surface of a shape corresponding to the shape of the mouth portion and the reverse tapered portion,
Before SL lifting mechanism, at a position where said neck cavity mold is in the open state, beyond the inverse tapered portion forming a cavity surface position the neck piece, which is held in the supply holding member, above the mouth portion-forming cavity surface A molding machine having a neck piece insert device, wherein the mold can be moved up to a position between the injection core mold and the neck cavity mold. An injection molding process in which a preform is injection molded using an injection core mold and a neck cavity mold in an injection molding section;
A transporting step in which the preform injection-molded in the injection-molding part is held by the injection core mold and the neck cavity mold and is circulated and transported to a take-out part by a transport means;
An extraction step of extracting the preform circulated and conveyed to the extraction portion from the injection core mold and the neck cavity mold,
A neck piece inserting step of inserting the neck piece into the neck cavity mold;
In a preform molding method including:
Said neck piece insert step,
The pre-Symbol neck piece, the delivery step of transferring to the supply holding member received by receiving holding member formed with the injection core mold to can be inserted cylindrical,
The neck piece held by the supply holding member is raised upward from the standby position lower than the lower end of the injection core mold to the neck cavity mold in the mold open state, and the neck piece is moved to the neck piece holding position of the neck cavity mold. An arrangement process to arrange;
A holding step of closing the neck cavity mold and holding the neck piece by the neck cavity mold in a state where the neck piece is disposed at the neck piece holding position;
A method for forming a preform, comprising:

Images