JP4474888B2 - Injection stretch blow molding system and injection stretch blow molding method - Google Patents

Description

  The present invention relates to an injection stretch blow molding system and an injection stretch blow molding method, and in particular, an injection stretch blow molding system and an injection in which an injection station, an injection molding station, a preform transfer station, and a stretch blow molding station can be joined and separated. The present invention relates to a stretch blow molding method.

Conventionally, containers formed by an injection stretch blow molding method, such as PET bottles, are formed by a molding method having at least an injection molding step and a stretch blow molding step.
And as the said injection stretch blow molding method, the molding method which combined the injection molding process and the stretch blow molding process variously according to the production amount of the container has been proposed and put into practical use.

For example, a two-stage molding method in which an injection molding process and a stretch blow molding process are made independent is used as a molding method for large lot products. This two-stage molding method is a molding method in which the injection molding apparatus and the stretch blow molding apparatus are not operated synchronously, and these apparatuses freely perform injection molding and stretch blow molding. For this reason, there is an advantage that the cycle time of stretch blow molding is not limited by the cycle time of injection molding which requires a longer time than stretch blow molding.
However, in this molding method, the preform to be injection-molded and the bottle to be stretch-blow-molded are separately molded at different stages, and when the preform is transported and loaded into the stretch-blow molding machine, the preforms contact each other. The preform is cooled to room temperature and cured so as not to cause scratches or deformation due to. For this reason, when performing stretch blow molding, it is necessary to reheat the preform that has been cooled to near room temperature to the stretching temperature, resulting in an increase in heat energy consumption required for reheating.

On the other hand, as a method for forming a small lot product, an injection molding device and a stretch blow molding device are installed on the same machine, and a rotary conveyance path is used to connect the injection molding process and the stretch blow molding process in a synchronized state. A stage forming method is used.
This one-stage molding method can effectively use the retained heat of the injection molding preform, and can reduce the consumption of reheating energy required for stretch blow molding.

  By the way, this one-stage molding method requires the same number of heating dies and stretch blow dies as the injection molds in one rotation conveyance path due to the system configuration, and further, the preform movement on the rotation conveyance path is prevented. Since a mechanism for holding the renovation neck ring portion is employed, it is necessary to set a plurality of molds having a complicated shape in the neck portion, and there is a disadvantage that the cost of the die becomes high. In addition, since the stretch blow molding cycle time is limited by the injection molding cycle time, the bottle molding speed cannot be increased.

  In recent years, in order to improve the disadvantages of the two-stage molding method and the one-stage molding method, there has been proposed a molding method in which a preform formed by injection molding is moved to a stretch blow device via a preform transfer device and stretch blow molded. This molding method is a molding method in which an injection molding device and a stretch blow device are installed on a single machine, and these two devices operate synchronously to mold a bottle, but the number of preforms that are injection molded at a time The number (B) of stretch blow molding is different from (P) (P> B), and there is an advantage that the cycle time of stretch blow molding is not limited by the cycle time of injection molding. (See Patent Document 1).

In addition, since this injection stretch blow molding method performs stretch blow molding of a preform that retains heat during injection molding, reheating energy can be reduced in the reheating step. Furthermore, the one-stage molding method is a method in which the injection unit, the heating unit, and the stretch blow molding unit are synchronously linked in the same rotation conveyance path, whereas this molding method is performed by injection molding via a preform transfer device. Since the preform thus formed is transferred to the stretch blow molding station, the cycle time of container molding can be shortened and the production capacity can be improved.
The injection stretch blow molding method includes a preform injection molding process for injection molding in an upright state, a preform moving process for receiving and reversing the injection molded preform, a transfer process for transferring the preform to a stretch blow station, It has a reheating process and a stretch blow molding process.

Japanese Patent No. 3227443 (Claims 3, 7, FIG. 2)

However, the injection stretch blow molding system and the method disclosed in Patent Document 1 are used to manufacture functional containers such as heat-resistant bottles obtained by heat-crystallizing preforms and containers by co-injection molding that improves gas barrier properties. There was a problem that it was not possible to cope with.
That is, the above-described injection stretch blow molding system has an injection device, a preform molding device, a preform transfer device, and a stretch blow molding device arranged on a single machine base on a rectangular parallelepiped, so that the system can be made compact. In addition, it was practically impossible to produce various functional bottles in consideration of container performance. This is because the injection device is fixed on the machine base, so it cannot be switched to a co-injection molding system consisting of multiple injection molding machines, and the preform circulation that holds the neck ring part of the injection preform This is because the preform mold cannot be easily replaced because of the transport mechanism.

In addition, this injection stretch blow molding system takes advantage of the effective use of the amount of heat retained during injection molding and reduces the amount of heat energy consumed in the reheating process. However, there is a problem that the post-processing cannot be performed on the preform formed by injection molding.
For example, since an auxiliary device such as a mouth heating crystallization device for performing heat crystallization of a preform cannot be installed, the system cannot form a heat-resistant stretch blow bottle.

  Furthermore, this injection stretch blow molding system is a system in which the preform after injection molding is transferred to the stretch blow station along the circulation transport path while holding the neck ring of the preform. Therefore, a complicated mold having a shape that holds the neck ring portion of the injection preform is required to be a multiple of the number of injection moldings. For this reason, there existed a problem that the cost reduction of an installation cost was not attained.

  In order to solve the above-mentioned problems, the present invention provides a preform transfer device, delivers the preform from the preform molding device to the stretch blow molding device, and includes an injection station, an injection molding station, a preform transfer station, and The stretch blow molding station is configured to be connectable and separable, the system configuration is flexible, and the injection stretch blow molding system and the injection stretch can be connected to the co-injection molding device and the crystallization device as necessary. An object is to provide a blow molding method.

To achieve this object, the injection stretch blow molding system of the present invention comprises an injection station having an injection machine, a preform transfer station having a preform molding apparatus and a preform transfer apparatus, and a stretch having a stretch blow molding apparatus. A blow molding station; and a control device for controlling the injection machine, the preform molding apparatus, the preform transfer apparatus, and the stretch blow molding apparatus, the injection station, the preform transfer station, and / or the stretch blow. The molding station and the preform transfer station can be joined and separated, respectively.
If it does in this way, according to a product, an injection station and a stretch blow molding station can be replaced | exchanged for every station, and it can respond to manufacture of a functional container.

The injection stretch blow molding system of the present invention includes an injection molding station having an injection machine and a preform molding device, a preform transfer station having a preform transfer device, a stretch blow molding station having a stretch blow molding device, A control device for controlling the injection machine, the preform molding apparatus, the preform transfer apparatus, and the stretch blow molding apparatus, the injection molding station, the preform transfer station, and / or the stretch blow molding station, Each of the preform transfer stations can be joined and separated.
If it does in this way, according to a product, an injection molding station and a stretch blow molding station can be replaced | exchanged for every station, and it can respond to manufacture of a functional container.

In the injection stretch blow molding system of the present invention, the control device comprises an injection machine controller, a preform molding device controller, a preform transfer device controller, and a stretch blow molding device controller. Each controller can be connected, and the injection machine, the preform molding apparatus, the preform transfer apparatus, and the stretch blow molding apparatus are controlled in association with each other.
In this way, when replacing each station such as the injection station, it is only necessary to connect the controller of the newly linked station to another controller instead of the controller of the station to be replaced. Can be performed efficiently.

In the injection stretch blow molding system of the present invention, the preform transfer station and / or the stretch blow molding station is provided with a storage device that temporarily stocks the preforms molded by the preform molding apparatus. is there.
If it does in this way, it can respond to the production fluctuation | variation of a preform shaping | molding process and a stretch blow molding process, and can improve production efficiency.

In the injection stretch blow molding system of the present invention, the preform molding device simultaneously molds P (P ≧ 2) preforms, and the stretch blow molding device has B (P> B ≧ 1). These bottles are stretch blow molded at the same time.
In this way, the cycle time of stretch blow molding is not limited by the cycle time of injection molding, so that productivity can be improved.

The injection stretch blow molding system of the present invention also includes a heating crystallization device for heating and crystallizing a predetermined portion of the preform molded by the preform molding device, and carrying the preform into and out of the heating crystallization device. A transport device is provided, and the transport device is provided between the preform molding device and the preform transfer device.
By doing so, it is possible to produce blow molded products that require heat crystallization treatment, such as heat-resistant taste seasoning containers and cosmetic containers.

In the injection stretch blow molding system of the present invention, the heat crystallization apparatus is configured to heat and crystallize the mouth portion of the preform.
If it does in this way, a mouth part crystallization heat-resistant PET bottle can also be produced, for example.

In the injection stretch blow molding system of the present invention, the preform transfer device converts the posture of the preform.
In this way, without providing a separate posture changing device, for example, the preform in the upright state can be inverted and changed into the inverted state, and the preform can be transferred.

Further, the injection stretch blow molding system of the present invention has a configuration in which a heating / warming device is provided between the preform molding device and the stretch blow molding device.
In this way, cooling of the preform can be suppressed and energy can be saved, and the injection-molded preform can be supplied to the stretch blow molding process under temperature control, resulting in poor quality due to inadequate temperature management. Can be reduced.

Further, the injection stretch blow molding system of the present invention is provided with a preform pitch conversion device that converts the pitch of the preform when the preform is transferred to the preform transfer station or the stretch blow molding station. is there.
If it does in this way, even if it is a case where the number which the preform shaping | molding apparatus and a stretch blow molding apparatus manufacture at a time differs, and the pitch to handle differs, synchronous production can be performed without trouble.

In the injection stretch blow molding system of the present invention, the stretch blow molding device is provided with a heating device that gives the preform a temperature distribution in the circumferential direction.
In this way, the temperature control of the preform can be performed with higher accuracy.

The injection stretch blow molding system of the present invention has a configuration in which a plurality of injection machines are provided, and the preforms can be co-injection molded by these injection machines.
In this way, a product with a multi-layer specification can be produced, and the exchange between the injection station equipped with the co-injection machine and the injection station equipped with the single-layer injection machine can be easily performed.

The injection stretch blow molding method of the present invention includes an injection station having an injection machine, a preform transfer station having a preform molding apparatus and a preform transfer apparatus, a stretch blow molding station having a stretch blow molding apparatus, An injection machine, a preform molding device, a preform transfer device, and a control device for controlling the stretch blow molding device, the injection station and the preform transfer station, and / or the stretch blow molding station and the preform. An injection stretch blow molding method using an injection stretch blow molding system in which each transfer station can be joined and separated, wherein the injection station injects a molding material, the preform transfer station molds the preform, and , The preset Transfer the beam, the stretch blow molding station is a method of blow molding the preform into the product of a predetermined shape.
In this way, the injection stretch blow molding system can have a degree of freedom, the range of stretch blow containers that can be injection stretch blow molded can be significantly expanded, and the configuration and layout of the injection station can be freely set.

The injection stretch blow molding method of the present invention includes an injection molding station having an injection machine and a preform molding device, a preform transfer station having a preform transfer device, a stretch blow molding station having a stretch blow molding device, A control device for controlling the injection machine, the preform molding apparatus, the preform transfer apparatus, and the stretch blow molding apparatus, the injection molding station, the preform transfer station, and / or the stretch blow molding station, An injection stretch blow molding method using an injection stretch blow molding system in which each preform transfer station can be joined and separated, wherein the injection molding station injects a molding material to form a preform, and the preform transfer station before Kipu Transfer the foam, the stretch blow molding station is a method of blow molding the preform into the product of a predetermined shape.
In this way, the injection stretch blow molding system can have a degree of freedom, the range of stretch blow containers that can be injection stretch blow molded can be significantly expanded, and the configuration and layout of the injection molding station can be freely set.

According to the injection stretch blow molding system of the present invention, the injection station (or injection molding station) and the stretch blow molding station can be exchanged for each station, and it is possible to easily cope with the manufacture of products having different specifications. For example, it is possible to easily exchange an injection station equipped with a co-injection machine and an injection station equipped with a single-layer injection machine.
Also, by connecting a heat crystallization apparatus, blow molded products that require heat crystallization treatment, such as heat-resistant taste seasoning containers, cosmetic containers, mouth crystallization heat-resistant PET bottles, etc. can be produced. .

  Further, according to the injection stretch blow molding method of the present invention, the injection stretch blow molding system has a degree of freedom, and the range of stretch blow containers capable of injection stretch blow molding is remarkably widened. It can be set freely.

[Embodiment 1]
FIG. 1: has shown the schematic plan view explaining the structure of Embodiment 1 of the injection stretch blow molding system concerning this invention.
In the figure, an injection stretch blow molding system 1 includes an injection station 2 comprising a machine base 200 and an injection machine 21, a stretch blow molding station 3 comprising a machine base 300 and a stretch blow molding device 31, and a machine base 400 and a preform. The preform transfer station 4 includes a molding device 41, a machine base 500, and a preform transfer device 42.

In the injection station 2, an injection machine 21 is mounted on a machine base 200, and the injection machine 21 is controlled by an injection machine controller 210.
Further, the machine base 200 is connected to the machine base 400 of the preform transfer station 4 by a coupler 50, and is fixed by a fixture 51 as necessary. For example, a connecting plate and a bolt may be used as the connector 50 and the fixture 51.
Thereby, when a different injection machine is needed according to the product to manufacture, the injection station 2 can be isolate | separated and the injection station with which the different injection machine was mounted can be joined instead.

In the preform transfer station 4, a preform molding apparatus 41 is mounted on the machine base 400, and a preform transfer apparatus 42 is mounted on the machine base 500. The machine base 500 is connected to the machine base 400 by the coupler 50 and the fixture 51.
In the present embodiment, the two connected machine bases 400 and 500 are used. However, the preform molding apparatus 41 and the preform transfer apparatus 42 may be mounted on one machine base (not shown). Good.
The preform molding apparatus 41 is controlled by a preform molding apparatus controller 410, and the preform transfer apparatus 42 is controlled by a preform transfer apparatus controller 420.

The preform molding apparatus 41 is for a hot runner mold 411, a preform molding injection mold (not shown), a neck mold 412, 413, an injection core mold 414 (see FIG. 2A), and a preform molding apparatus. It consists of a controller 410 and the like.
The preform is injection-molded by the preform molding injection mold, the neck molds 412, 413, and the injection core mold 414.

The neck molds 412 and 413 have a structure divided into two in the vertical direction, and can be moved in the vertical direction by a cylinder (not shown) or the like. The vertical mold and the injection core mold 414 or the injection cavity mold ( The preform is released from the preform molding injection mold or injection core mold 414 by single vertical movement or simultaneous vertical movement (not shown).
Further, the neck molds 412 and 413 can move with the horizontal direction connecting the preform molding device 41 and the preform transfer device 42 as a flow line, and the preform molding device 41 and the preform transfer device 42. Can be opened and closed in the horizontal direction. As a result, the neck molds 412 and 413 holding the preform are moved to the position of the cylindrical holder 422 which is a transfer part of the form transfer device 42, and then the neck molds 412 and 413 are opened and moved. The preform can be completely released from the neck molds 412 and 413 and moved to the cylindrical holder 422 of the preform transfer device 42.

Further, the movement of the preform is not limited to the above-described configuration. For example, the cylindrical holder 422 of the preform transfer device 42 goes to the position where the neck molds 412 and 413 open, and then, It is good also as a structure which moves a preform by the neck metal mold | dies 412 and 413 moving open.
Further, the preform is moved upward while being held by the neck molds 412 and 413, and is completely released from the injection cavity mold in a state where it partially contacts the injection core mold 414. Next, while holding the preform with the injection core mold 414 and the neck molds 412 and 413, the preform is horizontally moved to the upper part of the cylindrical holder 422 of the preform transfer device 42, and then the neck molds 412 and 413 are opened. Thus, the preform may be moved to the preform transfer device 42.
In the present embodiment, the number of preforms (P) that are injection-molded at a time is four. However, the number of preforms is not limited to this number (P = 4), and the number satisfies the condition of P ≧ 2. I just need it.

  The preform molding apparatus controller 410 is connected to the preform transfer apparatus controller 420 and the injection machine controller 210, and receives a molding start signal from the preform transfer apparatus controller 420. When it is detected that the molds 412, 413, 414, etc. reach a predetermined temperature and are ready for injection molding by a position sensor or the like (not shown), an injection start signal is output to the injection machine controller 210. Then, the preform molding apparatus 41 is controlled in synchronization with the injection machine 21 and the preform transfer apparatus controller 420.

The preform transfer device 42 has a tube provided with suction means (not shown) for sucking and holding the preform at one end corresponding to the position of the preform held by the neck molds 412 and 413. Rectangular transfer plate 421 in which four rotating holders 422 (see FIG. 2B) are juxtaposed and the rotating shaft 423 is penetrated at opposite ends, and a bearing that supports the rotating shaft 423 A rotation cylinder 425 that rotates the rotation shaft 423 by 180 °, and a preform transfer device controller 420.
Although not shown, the preform transfer device 42 includes a transfer plate 421, a rotating shaft 423, a bearing 424, and a vertical moving means for moving the rotating cylinder 425 up and down and a horizontal moving means for moving horizontally. As a configuration.
In this embodiment, the cylindrical holder 422 is used. However, the present invention is not limited to this configuration. For example, the preform may be hatched using an air hand.

  The preform transfer device controller 420 is connected to the blow molding device controller 310 and the preform molding device controller 410, and receives a transfer start signal from the blow molding device controller 310 to perform preform molding. The preform transfer device 42 is controlled in synchronization with the device 41.

In the stretch blow molding station 3, a stretch blow molding device 31 is mounted on a machine base 300.
The stretch blow molding device 31 is blow molded by a turret 312 having eight holders 311 arranged at equal intervals, a heating device 313 for heating a preform, and a blow molding part 315 having a blow cavity mold 314. And a bottle takeout unit 316 for taking out the bottle.

Further, the stretch blow molding device 31 is provided with a heating device 313 at a position shifted 45 ° and 90 ° counterclockwise from the preform receiving position (clockwise 3 o'clock direction) at the peripheral end of the turret 312. The blow molding unit 315 is disposed at a position moved 180 °, and the bottle takeout unit 316 is disposed at a position moved 270 °.
The turret 312 is temporarily stopped by rotating 45 ° counterclockwise so that each holder 311 temporarily stops at the receiving position.

Although not shown, the holder 311 includes a receiving device that uses air pressure or the like. The receiving device extracts the preform from the cylindrical holder 422 of the preform reversing device 42 at the receiving position, and holds the holder 311. The bottle taken out portion 316 discharges the blow-molded bottle.
Note that the holder 311 is configured to be mounted with one preform, and one preform is blow-molded at a time in the blow molding portion 315.

By the way, although not shown, it is also possible to provide two mandrels 317 on the holder 311 so that two preforms are blow-molded at a time in the blow molding section 315.
In this case, the two mandrels 317 are juxtaposed at a pitch larger than the pitch of the cylindrical holder 422 so that there is no problem even if the preform is blow-molded. That is, the preform is handled at the same pitch in the preform molding apparatus 41 and the preform transfer apparatus 42, but the holder 311 holds two preforms at a pitch larger than the same pitch. For this reason, the receiving device receives a preform and converts the pitch of the preform, and has a function as a preform pitch conversion device. If it does in this way, even if the pitch which the preform transfer apparatus 42 and the stretch blow molding apparatus 31 handle a preform differ, synchronous production can be performed without trouble.

Although not shown, the heating device 313 includes at least a heater and a temperature sensor, and is configured to irradiate the preform with heat from the outside. The heating method by heat irradiation from the inside may be used.
Here, if the mandrel 317 fixing the preform on the holder 311 is rotated at a uniform speed, the heating in the circumferential direction of the preform can be made uniform. Further, when the preform passes through the heating device 313, the temperature distribution in the circumferential direction of the preform can be provided by controlling the rotation speed and time of the mandrel 317.
In this embodiment, two heating devices 313 are provided, but the present invention is not limited to this configuration.

  The blow molding unit 315 includes a splittable blow cavity mold 314. A bottle (not shown) having a shape corresponding to the blow cavity mold 314 is accommodated by storing a preform in the blow cavity mold 314 and blowing high-pressure air. Blow molding). Then, the blow cavity mold 314 is divided and released.

  Although not shown, the bottle take-out unit 316 is configured to include a reversing device and a transfer conveyor, and the bottle discharged from the holder 311 is reversed and carried out after being in an upright state.

  The machine base 300 is connected to the machine base 500 of the preform transfer station 4 by a coupler 50 and a fixture 51. Thereby, when a different injection stretch blow molding device is required according to the product to be manufactured, the stretch blow molding station 3 can be separated and a stretch blow molding station equipped with a different stretch blow molding device can be joined instead.

The stretch blow molding apparatus 31 is controlled by a blow molding apparatus controller 310.
Even if the stretch blow molding unit 315 is temporarily stopped, the blow molding apparatus controller 310 can perform the injection station 2 and the preform transfer when the preform transfer apparatus 42 does not hold the preform. It is possible to operate the station 4 to perform injection molding or transfer to form a preform, thereby improving productivity.

Further, in the injection stretch blow molding system 1 of the present embodiment, the control device includes an injection machine controller 210, a preform molding device controller 410, a preform transfer device controller 420, and a blow molding device controller 310. These controllers 210, 410, 420, and 310 can be connected in this order. Further, the injection machine controller 210 is provided with an operation switch (not shown) of the injection stretch blow molding system 1, and when this operation switch is turned on, the respective controllers 210, 410, 420, 310 are operated. start, injector 21, the preform molding apparatus 41, a preform transfer device 4 2及 beauty blow molding apparatus 31 in association with the control (total control) to.
In addition, a control apparatus is not limited to the structure mentioned above, For example, it is good also as a structure which controls each apparatus 21,41,42,31 with one controller with high control capability.

Next, the operation of the injection stretch blow molding system 1 will be described.
First, when the operation switch of the injection machine controller 210 is turned on, each controller 210, 410, 420, 310 is activated.
When the injection machine controller 210 receives an injection start signal from the preform molding apparatus controller 410, the injection machine 21 advances and rotationally drives an internal screw (not shown) to produce an injection molding material. For example, polyethylene terephthalate (PET) is supplied to the hot runner mold 411.

The preform molding apparatus 41 is composed of a molding material supplied from the injection machine 21 by a preform molding injection mold, a split neck mold 412, 413, and an injection core mold 414 via a hot runner mold 411. The cavity 415 is filled, and a preform (not shown) is injection-molded in an upright state with the mouth portion up.
Next, when the preform is injection-molded, the neck molds 412, 413 and the injection core mold 414 are simultaneously raised, and the body portion of the preform is released from the preform-molding injection mold. Subsequently, while the neck molds 412 and 413 are stationary, the injection core mold 414 is further raised, and the preform is released from the injection core mold 414.

Next, the preform molding apparatus 41 horizontally moves the neck molds 412 and 413 holding the preform in the direction of the preform transfer apparatus 42, and the preform is positioned on the cylindrical holder 422 of the preform transfer apparatus 42. Descent where you did.
Subsequently, when the preform body is sucked and held by the cylindrical holder 422 of the preform transfer device 42, the preform molding device 41 moves the neck molds 412 and 413 to open and moves the preform into the neck mold. Release from 412,413. Then, the preform molding apparatus 41 returns the neck molds 412, 413, and the injection core mold 414 to the initial state in preparation for the next injection molding.

When the preform is inserted into the cylindrical holder 422 by the preform molding device 41, the preform transfer device 42 operates the suction means to suck and hold the preform body, and the preform is connected to the neck mold 412. When released from 413, the transfer plate 421 is rotated 180 ° toward the stretch blow molding station 3 side.
In this way, by providing the preform transfer device 42 having the above-described configuration, the preform in the upright state is inverted and converted into the inverted state without the need for a separate posture changing device, and the preform is stretched and blown. It can be transferred in the direction of the molding station 3.

  Next, in the stretch blow molding device 31, the receiving device extracts the preform from the cylindrical holder 422 of the preform reversing device 42 and attaches it to the mandrel 317 of the holder 311. Subsequently, the preform mounted on the mandrel 317 is heated by the heating device 313, blow-molded by the blow molding unit 315, and the bottle is discharged from the bottle take-out unit 316.

Thus, according to the injection stretch blow molding system 1 of the present embodiment, the injection station 2 and the stretch blow molding station 3 can be replaced for each station according to the product.
In addition, by providing a plurality of controllers 210, 410, 420, and 310, when replacing each station such as the injection station 1, control of the newly connected station is performed instead of the controller of the station to be replaced. Just connect the machine.

[Embodiment 2]
FIG. 3: has shown the schematic plan view explaining the structure of Embodiment 2 of the injection stretch blow molding system concerning this invention.
In the drawing, an injection stretch blow molding system 1a includes an injection molding station 2a comprising a machine base 200a, an injection machine 21 and a preform molding apparatus 41, a machine base 300, a stretch blow molding apparatus 31, a machine base 600 and a storage device 32. And a preform transfer station 4a including a machine base 500 and a preform transfer device 42.

In the injection molding station 2a, an injection machine 21 and a preform molding apparatus 41 are mounted on a machine base 200a. The injection machine 21 is controlled by an injection machine controller 210, and the preform molding apparatus 41 is for a preform molding apparatus. It is controlled by the controller 410.
The machine base 200 a is connected to the machine base 500 by the coupler 50 and the fixture 51.

In the preform transfer station 4a, a preform transfer device 42 is mounted on a machine base 500, and the preform transfer device 42 is controlled by a controller 420 for preform transfer device.
The machine base 500 is connected to the machine base 600 by a connector 50 and a fixture 51.

In the stretch blow molding station 3a, the stretch blow molding device 31 is mounted on the machine base 300, and the storage device 32 is mounted on the machine base 600. The machine base 600 is connected to the machine base 300 by the coupler 50 and the fixture 51.
In the present embodiment, the two connected machine bases 300 and 600 are used. However, the stretch blow molding device 31 and the storage device 32 may be mounted on one machine base (not shown).
The stretch blow molding device 31 and the storage device 32 are controlled by a stretch blow molding device controller 310.

The storage device 32 according to this embodiment includes four sprockets 321, 322, 323, and 324 and a transport chain 325 that is hung on the sprockets 321, 322, 323, and 324. N (N ≧ 2 × P) mandrels 326 (32 in the figure) are arranged.
The interval between the mandrels 326 is the same as the interval between the cylindrical holders 422 of the transfer plate 421. With the mandrel 326 positioned directly under the preform held by the cylindrical holder 422, the cylindrical holder 422 is sucked. When released, the four preforms are held on the mandrel 326 at a time.
The sprocket 321 is driven in a position-controlled state by a synchronous motor (not shown) or the like.

The blow molding apparatus controller 310 is connected to the preform transfer apparatus controller 420. This blow molding device controller 310 produces a preform for the storage device 32 and the stretch blow molding device 31 when the transfer of the preform from the preform transfer device 42 to the storage device 32 is temporarily stopped. The stretch blow molding apparatus 31 is stopped after the stretch blow molding is completed. Further, when the transfer of the preform from the preform transfer device 42 to the storage device 32 is resumed, the storage device 32 efficiently supplies the preform to the stretch blow molding device 31, and the injection stretch blow molding system 1a as a whole. Control so that the operating rate does not decrease.
The injection stretch blow molding system 1a of the present embodiment includes an injection molding station 2a in which the injection machine 21 and the preform molding apparatus 41 are mounted on a machine base 200a, and a stretch blow molding station 3a having a storage device 32. Other configurations are substantially the same as those of the injection stretch blow molding system 1.

Next, the operation of the injection stretch blow molding system 1a having the above configuration will be described.
First, the injection molding station 2a performs injection molding of a preform in substantially the same manner as the injection stretch blow molding system 1, and moves the injection molded preform to the cylindrical holder 422 of the preform transfer device 42.

Then, preform transfer device 42, the tubular holder 422 is attracted and held to the body portion of the preform, thereby 180 ° rotation of the transfer plate 421 to the stretch blow molding station 3 a side. Subsequently, the preform is lowered, the mouth portion of the preform is inserted into the mandrel 326 of the storage device 32, and the suction holding is released. Thereby, the holding state of the preform is released, and the preform is transferred to the storage device 32.

  Next, when the preform is transferred onto the mandrel 326 by the preform transfer device 42, the storage device 32 synchronizes with the stretch blow molding device 31 and transfers the transferred preform to the stretch blow molding device 31. The preform is moved to the charging position (position facing the holder 311), and the preform is supplied to the stretch blow molding apparatus 31. Further, the storage device 32 is in a state where the preform transfer device 42 can transfer the preform, and when the mandrels 326 not holding the preform continuously have the number of injection preforms (P) or more, The preform can be stored in the empty mandrel 326 by moving the mandrel 326 to a position corresponding to the cylindrical holder 422 of the transfer plate 421.

Next, in the stretch blow molding device 31, the receiving device extracts the preform from the mandrel 326 of the storage device 32 and attaches it to the mandrel 317 of the holder 311. Subsequently, the preform mounted on the mandrel 317 is heated by the heating device 313, blow-molded by the blow molding unit 315, and the bottle is discharged from the bottle take-out unit 316.
Instead of the receiving device described above, as a preform pitch converting device, for example, a preform pitch converting device using a conveyance wheel disclosed in Japanese Patent Application Laid-Open No. 58-25933 is used as a storage device 32 and stretch blow molding. It is good also as a structure provided between the apparatuses 31. FIG.

Thus, according to the injection stretch blow molding system 1a according to the present embodiment, the injection molding station 2a and the stretch blow molding station 3a can be exchanged for each station according to the product.
Moreover, by providing the stretch blow molding station 3a with a storage device 32 for temporarily stocking the preforms molded by the preform molding device 41, the production fluctuations of the preform molding process and the stretch blow molding process are absorbed, Production efficiency can be improved. For example, when the stretch blow molding unit 315 is temporarily stopped, it is not necessary to stop the preform molding device 41 while the storage device 32 can store, and even if the preform molding device 41 is temporarily stopped, The preform stored in the storage device 32 can be used without stopping the stretch blow molding device 31, and the production efficiency can be improved.

[Embodiment 3]
FIG. 4: has shown the schematic plan view explaining the structure of Embodiment 3 of the injection stretch blow molding system concerning this invention.
In the figure, an injection stretch blow molding system 1b includes a machine base 200b, an injection station 2b comprising a co-injection machine 21b and an injection machine 21, a machine base 300, a stretch blow molding device 31, a machine base 600, and a storage device 32. It comprises a blow molding station 3a, a machine base 400b, and a preform transfer station 4b comprising a preform molding device 41 and a preform transfer device 42.
The injection stretch blow molding system 1b of the present embodiment includes a hot runner mold 411b in which the preform molding apparatus 41 can flow a resin flow path of only a single layer resin and a flow path of two or more types of multilayer resins. Other configurations are almost the same as those of the injection stretch blow molding system 1a.

As described above, the injection stretch blow molding system 1b is provided with a plurality of injection machines, that is, the injection machine 21 and the co-injection machine 21b, in the injection station 2b. Blow molded products with different specifications can also be produced.
Furthermore, the injection station 2b having the co-injection machine 21b and the injection station 2 having only the single-layer injection machine 21 can be easily exchanged, and blow molded products having different specifications can be produced over a wide range. be able to.

This replacement operation is performed easily and in a short time by removing the coupler 50 and the fixture 51, moving the injection station 2, positioning the injection station 2a instead, and attaching the coupler 50 and the fixture 51. be able to.
Further, the switching operation of the control system accompanying the replacement of the injection station 2 (2b) is simply and short because the cable from the preform molding device controller 410 is connected to the injector controller 210 (210b). Can be done.

[Embodiment 4]
FIG. 5: has shown the schematic plan view explaining the structure of Embodiment 4 of the injection stretch blow molding system concerning this invention.
In the drawing, an injection stretch blow molding system 1c includes an injection station 2 comprising a machine base 200 and an injection machine 21, a machine base 300, a stretch blow molding device 31, a machine base 600 and a stretch blow molding station 3a comprising a storage device 32, A preform transfer station 4c comprising a machine base 400c, a preform molding apparatus 41 and a preform transfer apparatus 42, a heating crystallization apparatus 6 for partially heating and crystallizing a predetermined portion of the preform, and a preform for heating and crystallization It consists of a transfer device 7 that carries in and out of the device 6.
The injection stretch blow molding system 1c according to the present embodiment is the same as the injection stretch blow molding system 1a according to the second embodiment except that the transport device 7 is provided between the preform molding device 41 and the preform transfer device 42 to heat the preform. The crystallization apparatus 6 is configured to be partially heated and crystallized.

The heat crystallization apparatus 6 includes a heater 61 that partially heat-crystallizes a predetermined portion of the preform, a transport chain 62, and the like. The preform is input through an input chute 63, and a discharge chute 64 is provided. Is discharged through.
By doing so, it is possible to produce blow molded products that require heat crystallization treatment, such as heat-resistant taste seasoning containers and cosmetic containers.
Moreover, when the injection stretch blow molding system 1c manufactures a PET bottle, the heat crystallization apparatus 6 can produce a mouth crystallization heat-resistant PET bottle by heating and crystallizing the mouth portion of the preform.

Further, the transport device 7 includes a loading conveyor 71, a discharge conveyor 72, a delivery device (not shown), and a transport device controller 700.
The input conveyor 71, the discharge conveyor 72, and the delivery device are provided between the preform molding device 41 and the preform transfer device 42, and are controlled by the controller 700 for the conveying device. The transport device controller 700 is connected to the preform molding device controller 410 and the preform transfer device controller 420.

The input conveyor 71 is provided so as to face the neck molds 412 and 413 of the preform molding apparatus 41, and includes two plastic chains and a motor (not shown) on which the neck ring portion of the preform is placed. It is made up of. The neck molds 412 and 413 move the preform released from the injection mold and the injection core mold 414 to the input conveyor 71 although not shown.
When the preform is placed on the input conveyor 71, the plastic chain rotates to input the preform into the input chute 63.
Further, when the preform can be placed on the input conveyor 71, the transport device controller 700 outputs a molding start signal to the preform molding device controller 410.

  The carry-out conveyor 72 is provided so as to face the transfer plate 421 of the preform transfer device 42, and includes two plastic chains and a motor (not shown) on which the neck ring portion of the preform is placed. Yes. When the crystallized preform is placed on the carry-out conveyor 72 from the discharge chute 64, the plastic chain rotates to convey the preform to the end on the preform transfer device 42 side.

The delivery device includes an air hand (not shown) that is triaxially controlled by an air cylinder, etc. This delivery device conveys the preform to the end on the preform transfer device 42 side, and the preform. When a delivery start signal is input from the transfer device controller 420, the air hand picks up the mouth of the preform and moves up to a predetermined cylindrical holder 422 position of the preform transfer device 42. The preform is lowered so that the body portion is inserted into the cylindrical holder 422.
Then, when the delivery device inserts the preform into the cylindrical holder 422, the transport device controller 700 outputs an adsorption holding start signal to the preform transfer device controller 420, and the preform transfer device 42 The preform is adsorbed and held on the holder 422. When the preform is sucked and held on the cylindrical holder 422, the air hand of the delivery device is opened to deliver the preform.

The delivery device is configured to deliver the preforms one by one, but is not limited to this configuration, and may be configured to deliver a plurality of preforms collectively, for example.
In addition, the preform from which the neck molds 412 and 413 are released is configured to move to the input conveyor 71. However, the present invention is not limited to this configuration. It is good also as a structure moved to the input conveyor 71. FIG.

  When the preform transfer device 42 receives the suction holding start signal from the transport device controller 700, the preform transfer device 42 operates the suction means of the designated cylindrical holder 422 to suck and hold the preform. Then, when all the cylindrical holders 422 catch the preform, the transfer plate 421 is rotated 180 ° toward the storage device 32 to transfer the preform to the storage device 32.

In addition, it is preferable to provide a heating / heat-retaining device 81, 82, 83 (shown by a dotted line for ease of understanding) between the preform molding device 41 and the stretch blow molding device 31. Although not shown in the drawing, the heating / heat-retaining devices 81, 82, and 83 are composed of a heat-insulating cover and a temperature-controllable heater. The set temperature can be arbitrarily set according to the production status and the like. Further, the heating and heat retaining devices 81, 82 and 83 may be configured only by a heat insulating cover, and energy saving can be realized more effectively by providing a heat retaining device without actively providing a heating device. be able to.
In this way, cooling of the preform can be suppressed and energy can be saved, and the injection-molded preform can be supplied to the stretch blow molding process in a temperature-controlled state. Can be reduced.
Other structures are substantially the same as those of the injection stretch blow molding system 1a of the second embodiment.

Thus, the injection stretch blow molding system 1c according to the present embodiment can produce a mouth crystallization heat-resistant PET bottle.
In the present embodiment, the preform forming device 41, the transport device 7, the delivery device, and the preform transfer device 42 are mounted on the machine base 400c. However, the present invention is not limited to this configuration.
For example, although not shown, an injection molding station 2a having an injection machine 21 and a preform molding device 41 is provided, and the transport device 7 and the delivery device are mounted on a machine base (not shown) on which the preform transfer device 42 is mounted. It is good also as the structure which carried out.

[Embodiment 5]
The present invention is also effective as an invention of an injection stretch blow molding method.
In the injection stretch blow molding method, first, an injection station 2, a preform transfer station 4 and a stretch blow molding station 3 that can be joined and separated from each other are arranged in an arbitrary layout (step S1).
Next, the injection station 2 injects the molding material (step S2), the preform transfer station 4 molds the preform, further transfers the preform (step S3), and the stretch blow molding station 3 transfers the preform. Blow molding into a product having a predetermined shape (step S4).

As described above, the present invention is also effective as an injection stretch blow molding method. The injection stretch blow molding system has a degree of freedom, and the range of stretch blow containers capable of injection stretch blow molding is greatly expanded. The configuration and layout of each station 2, 4, 3 of the molding system 1 can be freely set.
In place of the injection station 2 and the preform transfer station 4, the injection molding station 2a uses the injection molding station 2a and the preform transfer station 4a to inject the molding material to form a preform, and the preform transfer station. 4a may be a method of transferring a preform.

The injection stretch blow molding system and the injection stretch blow molding method of the present invention have been described with reference to preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. It goes without saying that changes can be made.
For example, the blow molded product is not limited to a bottle, and may be, for example, a container other than a bottle, and can be applied to an injection stretch blow molding system and an injection stretch blow molding method for all blow molded products.

1 is a schematic plan view for explaining the structure of Embodiment 1 of an injection stretch blow molding system according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic explaining the structure of the principal part of the injection stretch blow molding system concerning Embodiment 1, (a) shows sectional drawing of a preform shaping | molding apparatus, (b) shows the top view of a preform transfer apparatus. Yes. The schematic plan view explaining the structure of Embodiment 2 of the injection stretch blow molding system concerning this invention is shown. The schematic plan view explaining the structure of Embodiment 3 of the injection stretch blow molding system concerning this invention is shown. The schematic plan view explaining the structure of Embodiment 4 of the injection stretch blow molding system concerning this invention is shown.

Explanation of symbols

1, 1a, 1b, 1c Injection stretch blow molding system 2, 2b Injection station 2a Injection molding station 3, 3a Stretch blow molding station 4, 4a, 4b, 4c Preform transfer station 6 Heating crystallization device 7 Conveying device 21 Injection machine 21b Co-injection machine 31 Stretch blow molding device 32 Storage device 41 Preform molding device 42 Preform transfer device 50 Connector 51 Fixing tool 61 Heater 62 Transport chain 63 Input chute 64 Discharge chute 71 Input conveyor 72 Discharge conveyors 81, 82, 83 Heating / Heat Keeping Device 200, 200a Machine Base 210, 210b Injection Machine Controller 300 Machine Base 310 Blow Molding Device Controller 311 Holder 312 Turret 313 Heating Device 314 Blow Cavity Mold 315 Blow Molding Section 316 Bottle Removal 317 Mandrel 321, 322, 323, 324 Sprocket 325 Conveying chain 326 Mandrel 400, 400 b, 400 c Machine base 410, 410 b Preform molding machine controller 411, 411 b Hot runner mold 412, 413 Neck mold 414 Injection core mold 415 cavity
420 Preform Transfer Device Controller 421 Transfer Plate 422 Cylindrical Holder 423 Rotating Shaft 424 Bearing 425 Rotating Cylinder 500 Machine 600 Machine 700 700 Conveyor Controller

Claims (14)

An injection station having an injection machine, a preform transfer station having a preform molding device and a preform transfer device, a stretch blow molding station having a stretch blow molding device, the injection machine, the preform molding device, and the preform transfer device. And a control device for controlling the stretch blow molding device,
An injection stretch blow molding system characterized in that the injection station and the preform transfer station and / or the stretch blow molding station and the preform transfer station can be joined and separated, respectively. An injection molding station having an injection machine and a preform molding apparatus, a preform transfer station having a preform transfer apparatus, a stretch blow molding station having a stretch blow molding apparatus, the injection machine, the preform molding apparatus, and the preform transfer A control device for controlling the apparatus and the stretch blow molding apparatus,
An injection stretch blow molding system characterized in that the injection molding station and the preform transfer station and / or the stretch blow molding station and the preform transfer station can be joined and separated, respectively.   The control device comprises an injection machine controller, a preform molding device controller, a preform transfer device controller, and a stretch blow molding device controller, each of which can be connected, and The injection stretch blow molding system according to claim 1 or 2, wherein the injection machine, the preform molding device, the preform transfer device, and the stretch blow molding device are controlled in association with each other.   The storage device for temporarily stocking the preform molded by the preform molding apparatus is provided at the preform transfer station and / or the stretch blow molding station. The injection stretch blow molding system described.   The preform molding device simultaneously molds P (P ≧ 2) preforms, and the stretch blow molding device stretches and blows B (P> B ≧ 1) bottles simultaneously. The injection stretch blow molding system according to claim 4.   A heating crystallization device for heat-crystallization of a predetermined portion of the preform formed by the preform forming device; and a transfer device for carrying the preform into and out of the heat crystallization device, the transfer device being the preform The injection stretch blow molding system according to any one of claims 1 to 5, wherein the injection stretch blow molding system is provided between the molding device and the preform transfer device.   The injection stretch blow molding system according to claim 6, wherein the heat crystallization apparatus heat-crystallizes the mouth portion of the preform.   The injection stretch blow molding system according to any one of claims 1 to 7, wherein the preform transfer device converts a posture of the preform.   The injection stretch blow molding system according to any one of claims 1 to 8, wherein a heating / heat retaining device is provided between the preform molding device and the stretch blow molding device.   The preform pitch conversion device for converting the pitch of the preform when the preform is transferred to the preform transfer station or the stretch blow molding station is provided. The injection stretch blow molding system described.   The injection stretch blow molding system according to any one of claims 1 to 10, wherein the stretch blow molding device is provided with a heating device that gives the preform a circumferential temperature distribution.   The injection stretch blow molding system according to any one of claims 1 to 9, wherein a plurality of injection machines are provided, and co-injection molding of the preform is enabled by these injection machines. An injection station having an injection machine, a preform transfer station having a preform molding device and a preform transfer device, a stretch blow molding station having a stretch blow molding device, the injection machine, the preform molding device, and the preform transfer device. And a control device for controlling the stretch blow molding device, and the injection station and the preform transfer station and / or the stretch blow molding station and the preform transfer station can be joined and separated, respectively. An injection stretch blow molding method using a blow molding system,
The injection station injects molding material;
The preform transfer station forms the preform, and further transfers the preform,
An injection stretch blow molding method, wherein the stretch blow molding station blows the preform into a product having a predetermined shape. An injection molding station having an injection machine and a preform molding apparatus, a preform transfer station having a preform transfer apparatus, a stretch blow molding station having a stretch blow molding apparatus, the injection machine, the preform molding apparatus, and the preform transfer And a control device for controlling the stretch blow molding device, and the injection molding station and the preform transfer station and / or the stretch blow molding station and the preform transfer station can be joined and separated, respectively. An injection stretch blow molding method using an injection stretch blow molding system,
The injection molding station injects a molding material to form a preform,
The preform transfer station to transfer the previous Symbol preform,
An injection stretch blow molding method, wherein the stretch blow molding station blows the preform into a product having a predetermined shape.

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