JP3200313B2 - Mold for preform molding equipment for container molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for a preform molding apparatus for molding containers, which can shorten an injection molding cycle time while securing a sufficient cooling time.

[0002]

2. Description of the Related Art Injection molding of a preform requires at least an injection cavity mold for defining an outer wall of the preform and an injection core mold for defining an inner wall of the preform. Furthermore, it is necessary to cool the preform to a temperature at which the preform can be released while maintaining the mold clamping state after the injection cavity mold and the injection core mold are mold-clamped and the preform is injection-molded. In the past, since the mold release temperature of the preform had to be sufficiently lowered, the injection molding cycle time was increased and the production efficiency was deteriorated. The factors that increase the cooling time are as follows (1) to (4).

(1) For example, when the injection cavity mold and the injection core mold are released from the preform and the preform is dropped and taken out, the preform is deformed even if it comes into contact with other members. Not necessary to cool the preform to a sufficiently low release temperature.

(2) If the preform release temperature is high,
When the injection core mold is released from the preform, the preform comes into close contact with the core mold, and a release defect called so-called winding occurs.

(3) If the preform release temperature is high,
After the injection core mold is released, there is no member that regulates the deformation of the preform, so that the preform cannot be taken out as designed due to deformation due to uneven temperature or thermal shrinkage.

(4) If the cooling by the injection core mold is insufficient, crystallization occurs particularly on the inner wall of the preform due to insufficient cooling, and a preform whose body is opaque is taken out.

On the other hand, Japanese Patent Publication No. 4-15721 and Japanese Patent Laid-Open Publication No. 3-140219 disclose an injection molding section, a cooling section, and a take-out section at each stop position of the intermittent rotation transfer means. There is disclosed a rotary injection molding apparatus that holds a formed preform in a neck mold of an intermittent rotation transfer unit and sequentially conveys the preform to a cooling unit and an unloading unit.

According to the rotary injection molding apparatus, it is not necessary to consider the above-mentioned factor (1), but (2) to (4)
Similarly, the injection molding cycle time must be lengthened due to the factor (4).

In the case of this rotary injection molding apparatus,
The cooling section requires a cooling pot and a cooling core, and further requires a separate take-out station. Therefore, the number of stations increases, and a neck type is additionally required. As described above, the rotary injection molding apparatus has caused an increase in the size and complexity of the apparatus and an increase in the number of members.

[0010] According to this rotary injection molding apparatus, in order to prevent crystallization of the neck portion having the largest thickness in the preform, the neck portion can be cooled by a neck mold. However, since the rotation direction is one direction, a rotary joint or the like is required to guide the refrigerant to the rotating neck type, and the configuration is complicated.

Further, in the conventional injection molding apparatus, the preform cannot be taken out unless the injection core mold is completely pulled out of the preform. In a rotary injection molding apparatus, the preform is transported from the injection molding section to the next step. become unable. When the injection core mold is completely pulled out from the preform in this way, the drawing stroke becomes longer,
There was also a problem that the overall height of the device was increased.

Accordingly, an object of the present invention is to provide a mold for a preform molding apparatus for container molding capable of shortening the injection molding cycle time and improving the production efficiency while ensuring a sufficient cooling time for the preform. Is to provide.

[0013]

The invention according to claim 1 is
Each of the above-mentioned transport members arranged above the processing section of each of the injection molding station and other stations .
It provided several in correspondence with station, the processing is conveyed by the conveying member to the processing unit above the respective station
A mold container forming shape preform molding apparatus for performing the processing in processing section, the mold closing and injection core mold, to be composed of split said injection core mold having a cooling function which is attached to the conveying member A neck cavity plate made possible, a neck fixing plate composed of split plates respectively holding the split molds of the neck cavity mold, and a guide for holding the neck fixing plate slidably in the mold opening direction of the neck cavity mold. And a member.

[0014] The invention according to claim 2, corresponding to each station of the injection molding station and other stations more provided in the transfer member, wherein the the container formed form a preform conveying to each station by the conveying member In the mold of the apparatus, an injection core mold having a cooling function attached to the conveying member, a neck cavity mold which is constituted by a split mold and can be closed with respect to the injection core mold, and a split of the neck cavity mold. A neck fixing plate composed of divided plates each holding a mold, a guide member for holding the neck fixing plate slidably in a mold opening direction of a neck cavity mold, and the injection core
Bar for urging the mold closing direction of the neck cavity mold for type
And a screw member .

[0015]

[0016]

[0017]

[0018] The invention according to claim 3, a plurality provided <br/> conveying member in correspondence with each station of the injection molding station and other stations, containers formed shapes to be conveyed to the each station by the conveying member In the mold of the preform molding apparatus, an injection core mold having a cooling function attached to the conveying member, and a neck cavity mold configured of a split mold and capable of closing the injection core mold,
A neck fixing plate comprising a split plate for holding the split mold of the neck cavity mold, a first guide member for holding at least a part of the lower surface of the neck fixing plate so as to be slidable, and an upper surface of the neck fixing plate; A second guide member for slidably supporting at least a part thereof, a spring member for urging the first and second guide members in a mold closing direction of the neck cavity mold and the injection core mold, and an upper part of the transport member And a means for opening the neck cavity mold from the injection core mold by being pressed by the ejection drive means provided in the apparatus.

According to a fourth aspect of the present invention, in the third aspect , the means for opening the neck cavity mold from the injection core mold is provided on a second guide member, and is provided within a range below the conveying member. It is characterized by being constituted by an extended driven rod.

According to a fifth aspect of the present invention, in the fourth aspect , the driven rod is provided within a range where the injection core mold is not completely pulled out of the preform, and is connected to the inner wall of the preform held by the neck cavity mold. in stroke sufficient to gap is formed between the injection core mold, characterized in that to relatively type open drive a neck cavity mold to said injection core.

[0021]

According to the first aspect of the present invention, after the preform injection-molded at the injection molding station is cooled by the injection cavity mold and the injection core mold, only the injection cavity mold is separated from the preform. Typed. Thereafter, the preform is transported to a cooling / unloading station by an injection core mold. During the transportation and at the cooling / unloading station, after the preform is cooled by the injection core mold, the preform is unloaded.

Therefore, even after the injection cavity mold is released from the injection molding station, cooling by the injection core mold ensures a sufficient cooling time of the preform. Therefore, the release temperature of the preform when releasing the injection cavity mold at the injection molding station can be increased, and the injection molding cycle time is shortened. Even when the injection cavity mold is released at a high temperature, the deformation of the preform can be prevented by the injection core mold, and the crystallization and opacity of the body due to insufficient cooling can be prevented. Further, by adjusting the release timing of the injection core mold, the cooling time can be adjusted without necessarily changing the injection cycle time.

A neck cavity mold can be used for injection molding, transportation and cooling of the preform. In this case, even after the injection core mold is released, the neck portion of the preform can be continuously cooled by the neck cavity mold and a thick wall is formed. The neck can be cooled sufficiently.

According to the second aspect of the present invention, in addition to the first aspect, the guide member is provided on the mold and the guide member is connected to the injection core mold.
By providing a spring member for biasing the mold closing direction of the click cavity mold without providing a biasing means for Ji mold-closing and injection core mold and neck cavity mold in each station, the neck cavity mold and the injection core mold Can be always integrated even when each station is stopped and during the rotation operation, and the mechanism of each station can be simplified and downsized.

According to the third aspect of the present invention, in addition to the above-mentioned state of the invention, the first and second guide members for holding the neck fixing plate slidably in the mold opening direction of each split mold of the neck cavity mold. As a result, by using the neck fixing plate as a guide when opening the mold, it is possible to improve the degree of freedom of the guide member in a limited mold installation space and to secure necessary strength while maintaining space saving. it can.

Further, by providing a means for driving the opening of the neck cavity mold from the injection core mold by pressing the ejection driving means provided above the conveying member, the neck cavity mold can be easily opened. . Further, it is not necessary to provide another member for opening the mold for each preform, so that the apparatus can be simplified. Furthermore, first and second guide members
In the mold closing direction of the injection core mold and neck cavity mold
By providing a spring member to
Urging means for closing the mold cavity mold and the injection core mold.
Without providing a neck cavity mold and an injection core mold
At all times even when each station is stopped and during rotation
It can be integrated, and each station's machine
The structure can be simplified and the size can be reduced.

According to the fourth aspect of the present invention, in addition to the state of the third aspect, a driven rod is provided on the second guide member as a means for driving the mold opening, and the driven rod is provided below the conveying member. By setting the length of the driven rod as long as possible, the stroke of the take-out drive mechanism can be shortened by setting the driven rod as long as possible. In addition, the molding cycle can be shortened and the molding efficiency can be improved.

According to a fifth aspect of the present invention, in addition to the state of the fourth aspect , the driven rod allows the neck cavity to be moved relative to the injection core mold by an amount of stroke sufficient to create a gap between the inner wall of the preform and the injection core mold. By relatively driving the mold to open, the stroke of the take-out drive mechanism can be further shortened and downsized, and the molding efficiency can be improved by shortening the molding cycle. Also, since the mold is opened within the range where the injection core mold is not completely pulled out of the preform, the injection core mold remains in the preform, and the preform is biased to one neck cavity mold. Even in this case, the injection core mold can restrict the lateral movement of the preform and drop the preform reliably.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a mold of a preform molding apparatus for molding a container according to the present invention is applied will be specifically described below with reference to FIGS.

FIG. 1 is a plan view of the apparatus of this embodiment. An injection device 12 is disposed on a machine base 10 shown in FIG. 1 and an injection molding station 14 is provided at a position facing the injection device 12. And a cooling / unloading station 16 are provided adjacent to each other.

As shown in FIGS. 4A and 4B, a lower clamping plate 20 fixed on the machine base 10 is provided below the injection molding station 14. This lower mold clamping plate 2
Above 0 and over the installation area of the injection molding station 14 and the cooling and unloading station 16, for example, a circular upper clamping plate 22 is arranged. The upper clamping plate 22 can be moved up and down along four tie bars 24 provided at four locations around the injection molding station 14.
As shown in FIGS. 1 and 4 (A) and (B), the tie bar 2
A fixing plate 26 is provided at the upper end of the cylinder 4, and a mold clamping cylinder 28 is fixed to the fixing plate 26. Mold clamping cylinder 28
Drives the mold clamping rod 28a, and the upper mold clamping plate 22 is driven up and down by the mold clamping rod 28a.

As shown in FIGS. 4A and 4B, a rotating plate 30 is rotatably supported on the lower surface of the upper mold clamping plate 22. As shown in FIG. 5, the rotating plate 30 is fixed to a rotating shaft 34 driven to rotate by a rotating actuator 32 fixed to the upper mold clamping plate 22. As shown in FIG. 2, which is a bottom view of the rotary plate 30, the rotary plate 30 includes two rows of an injection core mold 50 and a neck cavity mold 60.
It is supported at a position corresponding to each station 14,16. The details of the injection core mold 50 and the neck cavity mold 60 will be described later.

As shown in FIGS. 4A and 4B, the injection molding station 14 is provided with a hot runner mold 40 for nozzle-touching the injection device 12, and an injection cavity mold is provided above the hot runner mold 40. 42 is fixed. The injection cavity mold 42 has, for example, four cavities corresponding to the number of simultaneous moldings at the injection molding station 14. The injection cavity mold 42 is capable of cooling an injection-molded preform, and circulates a coolant, for example, normal-temperature water in the cavity mold.

2 shown in FIG. 2 supported by the rotating plate 30
As shown in FIG. 4 to FIG. 6, the injection core dies 50 in each row have, for example, four core pins 52 in the number of simultaneous moldings in each row. As shown in FIG. 5, a base end 52 of the core pin 52 is provided.
a is a core holding plate 54 fixed to the lower surface of the rotating plate 30.
And a core fixing plate 56 fixed to the lower surface of the core pressing plate 54. The mold clamping cylinder 28 is driven, and the mold clamping rod 28a drives the upper mold clamping plate 22 to move downward. Then, each core pin 52 of the injection core mold 50 is driven downward, and the injection cavity mold 42 is closed. Rotating plate 30
As shown in FIGS. 5 and 9, the two rows of neck cavity dies 60 are formed of a pair of split dies 62a and 62b. It is provided only for minutes. A pair of split dies 6 in each row
Dividing plates 64a, 64b for fixing 2a, 62b respectively
The split plates 64 a and 64 b constitute a neck fixing plate 64. Also, as shown in FIGS.
On the upper surface side of the split plates 64a and 64b, a neck pressing plate 65 constituting a second guide member for pressing and driving the neck fixing plate 64 downward is arranged. Further, a first support for supporting the lower surfaces of both ends in the longitudinal direction of the neck fixing plate 64.
A guide plate 66 is provided. The split plates 64a and 64b are always set in a closed state by a spring 64c as an urging means shown in FIG. As shown in FIG. 2, wedge holes 64d are provided at both ends in the longitudinal direction of each of the divided plates 64a and 64b. After the neck fixing plate 64 has been carried into the cooling / unloading station 16, as shown in FIGS. , Is driven to open along the guide plate 66.

FIGS. 7 and 3 are enlarged cross-sectional views of a portion A in FIG.
As shown in FIG. 5, an elevating pin 70 whose lower end is fixed to the guide plate 66 extends upward, and a flange 70a is formed at the upper end of the elevating pin 70. On the other hand, the guide cylinder 72 extending downward from the lower surface of the rotating plate 30
Is fixed, and the elevating pin 70 is disposed in the guide cylinder 72. A return spring 74 is disposed between the bottom inner wall of the guide cylinder 72 and the flange 70a of the elevating pin 70 as urging means. Due to the upward biasing force of the return spring 74, the guide plate 66 is constantly urged to move upward, and as a result, the neck pressing plate 65 is always in close contact with the lower surface of the core fixing plate 56.

By maintaining the close contact state between the core fixing plate 56 and the neck pressing plate 65, the closed state between the injection core mold 50 and the neck cavity mold 60 is set. Further, the external force (described later) applied at the cooling / unloading station 16 lowers the elevating pin 70 against the urging force of the return spring 74, and moves the neck pressing plate 65 away from the lower surface of the core fixing plate 56. , And presses the neck fixing plate 64 downward. As a result, the preform 1 whose neck portion 2 is held by the neck cavity mold 60 is driven to be released from the core pin 52 of the injection core mold 50.

Next, the preform take-out drive mechanism in the cooling / take-out station 16 will be described. In this embodiment, the preform take-out drive mechanism is constituted by the neck release drive section 80 and the split mold release drive section 100.
The neck release drive unit 80 has a first cylinder 82 as shown in FIG. 6, and the first cylinder 82 is supported by the upper mold clamping plate 22 via a first support column 84a. Is fixed to the cylinder fixing plate 84b. The first cylinder 82 drives the first lifting plate 86 up and down via the first piston rod 82a. Press driving rods 88 are provided on both ends of the first lifting plate 86 in the longitudinal direction. On the other hand, the upper mold clamping plate 22 is provided with a hole 22a penetrating from the upper surface to the lower surface, and the pressing drive rod 88 is disposed in the hole 22a. The initial position of the first lifting plate 86 is set at a position where the tip of the pressing drive rod 88 does not protrude from the lower surface of the upper mold clamping plate 22 so as not to hinder the rotational driving of the rotating plate 30.

As shown in FIG. 6, the rotary plate 30, the core pressing plate 54, and the core fixing plate 56 are provided with holes 2 of the upper mold clamping plate 22.
The holes 30a, 54a, 5
6a. Then, on the upper surface of the neck pressing plate 65,
A driven rod 68 disposed in each of the holes 30a, 54a, 56a is fixed.

Therefore, when the first cylinder 82 is driven, the first piston rod 82a, the pressing drive rod 8
The neck pressing plate 65 and the neck fixing plate 64 are driven downward via the 8 and the driven rod 68 against the urging force of the return spring 74. As a result, FIG.
As shown in (1), the preform 1 in which the neck portion 2 is held by the neck cavity mold 60 is driven to be released from the core pin 52 of the injection core mold 50. In the present embodiment, the core pin 52 of the injection core mold 50 does not need to be completely pulled out from the opening end of the preform 1, and at least a gap into which air enters between the core pin 52 and the inner wall of the preform 1. Should be born. In the present embodiment, the descending stroke of the neck fixing plate 64, that is, the releasing stroke of the core pin 52 (the length L shown in FIG. 8) is, for example, 50 mm.
Is set to

Next, the split mold opening drive unit 100 will be described. The split mold opening drive unit 100 has, for example, two second cylinders 102 as shown in FIGS. As shown in FIG. 9, the second cylinder 102
It is fixed to a second cylinder fixing plate 104b supported by a first elevating plate 86 via a second support 104a.
Therefore, the first lifting plate 8 is moved by the first cylinder 82.
6 is driven up and down, the second cylinder 1
02 is also driven up and down. The second cylinder 102 is connected to the second cylinder 102 via a second piston rod 102a.
Is moved up and down. Split-type opening cams 108 are fixed to the second lifting plate 106 at both ends in the longitudinal direction. This split type opening cam 1
08 is provided with a split plate 6 forming the neck fixing plate 64.
It has a wedge shape corresponding to the wedge hole 64d provided in 4a, 64b. Therefore, the second cylinder 1
02, the split-type opening cam 108 is driven downward to insert the wedge portion at the tip thereof into each of the wedge holes 64d of the neck fixing plate 64, thereby opening the pair of split plates 64a and 64b. Driven. Then, the pair of split dies 62a and 62b fixed to the pair of split plates 64a and 64b, respectively, are opened and the preform 1 is taken out from the neck cavity die 60. In the present embodiment, the drive timing of the second cylinder 102 is set after the drive of the first cylinder 82.

Next, the injection molding operation of the preform 1 in the above embodiment will be described.

(1) Injection Molding Step in Injection Molding Station 14 By driving the mold clamping cylinder 28 to lower the upper mold clamping plate 22, the injection core mold and the neck cavity mold 60 are moved relative to the injection cavity mold 42. The mold is closed. After setting the mold clamping state shown in FIG. 4, the screw in the injection device 12 is driven forward and rotationally, so that the injection molding material of the preform 1, for example, polyethylene terephthalate (P)
ET) is connected to each mold 4 via the hot runner mold 40.
The cavities defined by 2, 50 and 60 are filled and injection molding of the preform 1 is performed.

(2) Cooling Step at Injection Molding Station The injection cavity mold 42, the injection core mold 50 and the neck cavity mold 60 each circulate a coolant, for example, water at normal temperature. It can be cooled immediately.

(3) Release Process of Injection Cavity Mold 42 at Injection Molding Station 14 By driving the mold clamping cylinder 28 to drive the upper mold clamping plate 22 upward, the injection cavity is opened as shown in FIG. The injection core mold 50 and the neck cavity mold 60 can be driven upward with respect to the mold 42. At this time, since the neck portion 2 of the preform 1 forms an undercut in the mold release direction, the injection-molded preform 1 is held by the injection core mold 50 and the neck cavity mold 60, and the injection cavity is formed. The mold 42 is released from the mold 42.

The mold release start timing at the injection molding station 14 can be sufficiently earlier than the conventional mold release start timing. In other words, the injection molding station 1
4, the cooling time of the preform 1 can be shortened. This is because even after the injection cavity mold 42 is released from the preform 1, the state in which the core pin 52 of the injection core mold 50 is inserted into the preform 1 can be maintained, and the deformation accompanying the heat shrinkage of the preform 1 can be maintained. This is because it can prevent.
Therefore, the release temperature of the preform 1 in the injection molding station 14 may be a temperature at which a skin layer is formed on the surface of the preform 1 such that the shape of the skin layer can be maintained even after the injection cavity mold 42 is released. May be higher than the mold release temperature. Even at such a high mold release temperature, the preform 1 shrinks to the side of the injection core mold 50 in close contact with the core pin 52 by cooling, so that the mold release from the injection cavity mold 42 can be performed relatively smoothly. And the mold release failure of the preform 1 does not occur. Further, since the core pins 52 are not pulled out at the injection molding station 14, even if the preform 1 is released at a high release temperature, the lower end of the preform 1 is wound up together with the core pins 52. Also does not occur.

In the closed state of the injection core mold 50 and the neck cavity mold 60 with respect to the preform 1 from which the injection cavity mold 42 has been released, the core fixing plate 56 and the neck pressing plate 65 are brought into close contact with the return spring 74. It is maintained by doing. The closed state of the injection core mold 50 and the neck cavity mold 60 is maintained until the injection core mold 50 is driven to be released from the cooling / unloading station 16 through the subsequent step of transporting the preform 1. Therefore, the injection core mold 50 and the neck cavity mold 50
While maintaining the mold closed state, the preform 1 can be cooled.

(4) Step of transporting the preform 1 In transporting the preform 1 from the injection molding station 14 to the cooling / unloading station 16, the rotary actuator 32 is driven to rotate the rotary plate 30 by 180 °. Performed by In the conveying step of the preform 1, the injection core mold 50 and the neck cavity mold 60 are used.
It is possible to continuously cool the preform 1 by the refrigerant circulating through the preform 1.

When the preform 1 is released from the mold at a high temperature, crystallization occurs due to insufficient cooling, and the wall surface of the preform 1 becomes opaque. In particular, when a transparent container is formed using PET. Is a fatal drawback.
According to experiments performed by the present inventors, it has been found that crystallization and opacity of the preform 1 due to insufficient cooling are more remarkable on the inner wall side of the preform 1. This is due to the fact that the contact area with the mold is smaller on the inner wall side of the preform 1, and the inner wall is less cooled than the outer wall. Further, when the injection cavity mold 42 and the injection core mold 50 are released from the preform 1 at the injection molding station as in the conventional case, the heat radiation area is smaller on the inner wall side of the preform 1 and the preform is further reduced. This is because heat is trapped inside 1 and the inner wall side is insufficiently cooled compared to the outer wall.

In this embodiment, the injection molding station 14
Even if the preform 1 is released from the mold at a relatively high temperature, the preform 1 can be cooled by the injection core mold 50 and the neck cavity mold 60 in the subsequent transporting step. In particular, since the inner wall of the preform 1 can be continuously cooled by the core pins 52 of the injection core mold 50, crystallization and opacity due to insufficient cooling can be reliably prevented. Further, the neck portion 2 having a large heat capacity due to its large thickness and easy to crystallize can be cooled by the neck cavity mold 60 to prevent crystallization.

(5) Step of Cooling Preform at Cooling / Unloading Station After the preform 1 has been carried into the cooling / unloading station 16, the injection core mold 50 and the neck cavity mold 60 are also maintained.
By maintaining the mold closed state for the preform 1 of
The preform 1 can be cooled in the same manner as in the transporting step. At this time, even if the mold clamping cylinder 28 is driven to lower the upper mold clamping plate 22 for injection molding of the next preform at the injection molding station 14, the above-described mold closed state at the cooling / unloading station 16 is not changed. Is maintained, the cooling of the preform 1 can be continued.

(6) Release process of neck cavity mold 60 from injection core mold 50 Cooling of preform 1 by core pins 52 of injection core mold 50 prevents crystallization caused by insufficient cooling of the inner wall of preform 1. Then, a cooling time sufficient to prevent deformation of the ejected preform 1 is sufficient.
If the core pin 52 is supercooled, it becomes difficult to drive the core pin 52 out. Therefore, in the cooling / unloading station 16, first, the injection core mold 50 is driven to be released from the preform 1. In the present embodiment, the neck cavity mold 60 holding the preform 1 is used.
Is driven to open with respect to the injection core mold 50.

The opening of the neck cavity mold 60 is driven by the urging force of the return spring 74 and the neck pressing plate 6 maintained in close contact with the core fixing plate 56.
5 is driven downward by the neck release drive unit 80. First cylinder 82 of neck release drive 80
Is driven, the first piston rod 82a, the first elevating plate 86, the pressing drive rod 88, and the driven rod 68
As a result, the neck fixing plate 64 is pressed by the neck pressing plate 65 to be driven downward as shown in FIGS. At this time, preform 1
Since the neck portion 2 is held by the neck cavity mold 60, the preform 1 is also driven to descend together with the neck fixing plate 64 and the neck cavity mold 60. Therefore, the preform 1 is released from the injection core mold 50 by the relative release driving of the neck cavity mold 60 and the injection core mold 50.

The injection core mold 5 for the preform 1
The release stroke of 0 does not completely release the core pin 52 from the open end of the preform 1 for the subsequent transport of the preform 1 as in the conventional case. Any amount may be used as long as a gap is formed between the inner wall and the air. Therefore, the release stroke of the injection core mold 50 depends on the angle of the extraction taper formed on the core pin 52 and the inner wall of the preform 1, and the greater the extraction taper angle, the smaller the amount of release stroke. Thus, the injection core mold 50
Of the first cylinder 8
2, the height of the injection molding device can be reduced, and by reducing the overall height of the injection molding device, it is advantageous in terms of transportation and installation of the device.

(7) Step of Removing Preform The neck 2 of the preform 1 has a pair of split dies 62.
The preform 1 is taken out by releasing the neck cavity mold 60 because it is held by the neck cavity mold 60 composed of a and 62b. For this purpose, the second cylinder 10 of the split mold opening drive unit 100
2 is driven. The driving force of the second cylinder 102 is controlled by the second piston rod 102a, the second lift plate 10
6 to the split opening cam 108. As the split mold opening cam 108 is driven to move downward, its tip is inserted into a wedge hole 64d formed in the pair of split plates 64a and 64b as shown in FIG.
Is opened to open the pair of split dies 62a and 62b. At this time, even if one split mold 62
If the core pin 52 of the injection core mold 50 remains in the preform 1 even if the neck portion 2 of the preform 1 moves in close contact with the a and 62b, the side of the preform 1 The movement in the direction is regulated, and the preform 1 can be reliably dropped downward.

Further, before the split mold opening cam 108 is driven to descend, the leading end thereof stops within the thickness range of the upper mold clamping plate 22 in order to avoid interference during the rotation driving of the rotating plate 30. Must be. On the other hand, the neck fixing plate 64 driven to be opened by the split opening cam 108 is
Since it is located farthest from the rotary plate 30, the downward stroke of the split mold opening cam 108 becomes longer. In this embodiment,
The second cylinder 10 for driving the split opening cam 108
2 is fixed to a first elevating plate 86 driven by a first cylinder 82, and before the split mold opening cam 108 is driven, the first
Since the lifting plate 86 is driven to descend, the substantial downward stroke of the split mold opening cam 108 can be shortened. Thus, the installation height of the second cylinder 102 can be reduced, and the overall height of the injection molding machine can be reduced, thereby providing an advantageous apparatus in terms of transportation and installation.

After the step of removing the preform 1 is completed, the first and second cylinders 82 and 102 are returned to the initial state. As a result, the neck pressing plate 65 is brought into close contact with the core fixing plate 56 by the return spring 74, and the injection core mold 50 and the neck cavity mold 60 can be returned to the mold closed state in preparation for the next preform injection molding. The above-described cooling and release process in the cooling / unloading station 16 is completed until the injection molding of the next new preform is completed in the injection molding station 14, in other words, within the injection molding cycle time. Good. The cooling time of the preform 1 depends particularly on the thickness of the body of the preform 1, and it is necessary to secure a longer cooling time as the thickness of the preform 1 increases. In the present embodiment, the adjustment of the cooling time can be adjusted by setting the release timing of the injection core mold 50 in the cooling / unloading station 16 in addition to the adjustment of the cooling time in the injection molding station 14. Therefore, while the mold release temperature in the injection molding station 14 is increased to shorten the injection molding cycle, the adjustment of the cooling time is easy, so that a highly versatile injection molding apparatus can be provided.

After the injection molding of the preform 1 in the injection molding station 14 is completed, the rotary plate 30 is rotated by 180 °
The injection core mold 50 and the neck cavity mold 60 are exchanged for the two stations 14 and 16. In this embodiment, the rotary actuator 32 is constituted by a reversible rotary transport unit in which the rotational transport direction is changed each time. Therefore, the injection core mold 50 that is rotated and conveyed
Even if a cooling pipe for circulating the refrigerant is connected to the neck cavity mold 60, the cooling pipe is not twisted more than one rotation. Therefore, the connection of the cooling pipe to the mold can be performed without using a rotary connector or the like, and the configuration is not complicated.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention.

To release the injection core mold 50 from the preform 1 at the cooling / unloading station 16, for example, the following method can be adopted. That is, the injection core mold 50
The core pin 52 only needs to have a function of introducing air for eject drive into the preform 1. In this case, the preform 1
After the preform 1 is cooled by the injection core mold 50, air is blown out by the core pin 52, so that the preform 1 can be dropped downward by the air pressure.

[0060]

As described above, according to the first aspect of the present invention, even after the injection cavity mold is released from the injection molding station, it is cooled by the injection core mold to cool the preform. A sufficient time can be secured, and therefore, the release temperature of the preform at the time of releasing the injection cavity mold at the injection molding station can be increased, and there is an effect that the injection molding cycle time can be shortened. Also,
Even if the injection cavity mold is released at a high temperature, the injection core mold can prevent the deformation of the preform, and can also prevent the body from being crystallized and opaque due to insufficient cooling. Further, by adjusting the release timing of the injection core mold, there is an effect that the cooling time can be adjusted without necessarily changing the injection cycle time.

A neck cavity mold can be used for injection molding, transportation and cooling of the preform. In this case, even after the injection core mold is released, the neck portion of the preform can be continuously cooled by the neck cavity mold, and a thick wall is formed. There is an effect that the neck portion can be sufficiently cooled.

According to the second aspect of the present invention, in addition to the first aspect, the guide member is provided on the mold and is connected to the injection core mold.
By providing a spring member for biasing the cavity cavity mold in the mold closing direction, the neck cavity mold and the injection core mold can be separated without providing a biasing means for closing the neck cavity mold and the injection core mold at each station. Even when each station is stopped and during the rotation operation, it can be made into an integrated state at all times, so that the mechanism of each station can be simplified and downsized.

According to the third aspect of the present invention, in addition to the above-mentioned state of the invention, the first and second guide members for holding the neck fixing plate slidably in the mold opening direction of each split mold of the neck cavity mold. As a result, by using the neck fixing plate as a guide when opening the mold, it is possible to improve the degree of freedom of the guide member in a limited mold installation space and to secure necessary strength while maintaining space saving. There is an effect that can be.

Further, by providing means for driving the neck cavity mold from the injection core mold by being pressed by the ejection driving means provided above the conveying member, the neck cavity mold can be easily opened. . Further, there is an effect that it is not necessary to provide another member for opening the mold for each preform, and the apparatus can be simplified. In addition, the first and
Injection core type and neck cavity type for the second guide member
By providing a spring member that urges in the mold closing direction,
Neck cavity mold and injection core mold at the station
Neck cavity without providing biasing means to close
Mold and injection core mold at each station stop and rotation
It can always be integrated in the inside,
The station mechanism can be simplified and downsized
effective.

According to the fourth aspect of the present invention, in addition to the state of the third aspect, a driven rod is provided on the second guide member as a means for driving the mold opening, and the driven rod is provided below the conveying member. By setting the length of the driven rod as long as possible, the stroke of the take-out drive mechanism can be shortened by setting the driven rod as long as possible. In addition to this, there is an effect that the molding cycle can be shortened and the molding efficiency can be improved.

According to the fifth aspect of the present invention, in addition to the state of the fourth aspect , the driven rod allows the neck cavity to be moved relative to the injection core mold by an amount of stroke sufficient to create a gap between the inner wall of the preform and the injection core mold. By relatively driving the mold to open, the stroke of the take-out drive mechanism can be further shortened and downsized, and the molding efficiency can be improved by shortening the molding cycle. Also, since the mold is opened within the range where the injection core mold is not completely pulled out of the preform, the injection core mold remains in the preform, and the preform is biased to one neck cavity mold. Even in this case, the injection core mold can restrict the lateral movement of the preform and drop the preform reliably.

[0067]

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a bottom view of the rotating plate.

FIG. 3 is a schematic perspective view showing a release state of an injection core type in which a neck pressing plate is driven to descend.

FIG. 4A is a side view showing a mold opening state of the embodiment apparatus, and FIG. 4B is a side view showing a mold closing state of the embodiment apparatus.

FIG. 5 is a schematic sectional view showing a mounting structure of an injection core type and a neck cavity type with respect to a rotating plate.

FIG. 6 is a schematic explanatory view of a preform take-out drive mechanism.

FIG. 7 is an enlarged sectional view of a portion A in FIG. 6;

FIG. 8 is a schematic explanatory view for explaining a release state of the injection core mold.

FIG. 9 is a schematic explanatory view for explaining a preform take-out drive.

[Explanation of symbols]

 Reference Signs List 1 preform 2 neck 14 injection molding station 16 cooling / unloading station 30 rotary plate 32 rotary actuator 42 injection cavity 50 injection core 52 core pin 60 neck cavity 62a, 62b pair of split dies 64 neck fixing plate 64a, 64b Plate 66 Guide plate 68 Driven rod 70 Lifting pin 74 Return spring 80 Core release drive 100 Split release drive

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI // B29L 22:00 (56) References JP-A-57-70620 (JP, A) (58) Fields investigated (Int.Cl. . ^7, DB name) B29C 49/00 - 49/80

Claims (5)

(57) [Claims] 1. A transfer machine disposed above a processing section of each of an injection molding station and another station.
The members corresponding to each station provided multiple and,
Wherein a mold for each station of the processing unit container formed form a preform molding apparatus for performing the process is conveyed by each processing unit upward by the conveying member, the injection core having a cooling function which is attached to the conveying member A neck cavity mold composed of a mold, a mold cavity, which can be closed with respect to the injection core mold; a neck fixing plate composed of split plates respectively holding the mold halves of the neck cavity mold; mold plate neck cavity mold in the mold open and a guide member for slidably holding the direction, the container formed form a preform molding apparatus comprising: a. Wherein the injection molding station and other multiple set <br/> eclipse the conveying member in correspondence with each station of the station, the conveying member by the container forming the shape preform molding apparatus which is transported to the each station An injection core mold having a cooling function attached to the conveying member; a neck cavity mold configured of a split mold and capable of being closed with respect to the injection core mold; and a split mold of the neck cavity mold. A neck fixing plate composed of a divided plate for holding the neck fixing plate, a guide member for holding the neck fixing plate slidably in a mold opening direction of a neck cavity mold, and a neck cabinet for the injection core mold with respect to the injection core mold.
Mold tee type type and a spring member for biasing the closing direction, the container formed form a preform molding apparatus comprising: a. Wherein the injection molding station and other multiple set <br/> eclipse the conveying member in correspondence with each station of the station, the conveying member by the container forming the shape preform molding apparatus which is transported to the each station An injection core mold having a cooling function attached to the conveying member; a neck cavity mold configured of a split mold and capable of being closed with respect to the injection core mold; and a split mold of the neck cavity mold. And a first guide member for holding at least a part of a lower surface of the neck fixing plate so as to be slidable, and at least a part of an upper surface of the neck fixing plate being slidable. a second guide member for supporting, with the first and second guide members in the mold closing direction of the neck cavity mold and the injection core mold A spring member for said are pressed against the take-out drive means provided on the conveying member upwardly neck cavity mold to said means for mold opening driven from the injection core mold, characterized that the container formed form a preform in that it comprises Equipment mold. 4. The driving rod according to claim 3 , wherein the means for driving the neck cavity mold to open from the injection core mold is provided on a second guide member and extends in a range below the transport member. A mold for a preform molding apparatus for container molding, characterized by being constituted by: 5. The preform inner wall and the injection core mold according to claim 4 , wherein the driven rod is in a range where the injection core mold is not completely pulled out of the preform, and is held in a neck cavity mold. die at the stroke amount sufficient to gap is formed, relatively-type opening operation is to be container-molding preform molding apparatus according to claim neck cavity mold to said injection core during.