JP2000271992A - Injection stretch blow molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve space saving of the whole of an apparatus and further miniaturization. SOLUTION: A preform molding station 14 for producing a preform by injection molding and a blow molding station 16 for performing the stretching blow molding of the preform to form a container are provided and the preform molding station 14 has the injection molding part 24 connected to an injection device 22, a preform taking-out part 26 and a rotary plate 20 rotating the preform to feed the same from the injection molding part 24 to the preform taking-out part 26 and the injection molding part 24 and the preform taking-out part 26 are parallelly arranged in the direction crossing the injection device 22 at a right angle and the blow molding station 16 is arranged in parallel to the injection device 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection stretch blow molding apparatus, and more particularly to an injection stretch blow molding apparatus capable of reducing the size of the entire apparatus.

[0002]

BACKGROUND OF THE INVENTION The present applicant has previously proposed an injection stretch blow molding apparatus as disclosed in Japanese Patent Application Laid-Open No. 8-132517.

[0003] This injection stretch blow molding apparatus comprises a preform molding station for injection molding a preform;
An epoch-making system that achieves miniaturization of the equipment by linearly arranging a transfer station that transfers the preform from the preform molding station and a blow molding station that blow-molds the preform received from the transfer station into a container shape. It is typical.

[0004] On the other hand, further miniaturization has been desired in consideration of ease of handling during transportation.

SUMMARY OF THE INVENTION An object of the present invention is to provide an injection stretch blow molding apparatus capable of saving space in the entire apparatus and achieving further miniaturization.

[0006]

In order to achieve the above object, an injection stretch blow molding apparatus according to the present invention comprises a preform molding station for injection molding a preform, and a blow molding for stretch blow molding a container from the preform. A preform molding station, which is connected to an injection device, an injection molding section, a preform removal section for taking out a preform, and rotating the preform from the injection molding section to the preform removal section. Having a rotary conveying means for conveying, wherein the injection molding section and the preform take-out section are arranged in parallel in a direction orthogonal to the injection apparatus, and the blow molding station is arranged in parallel with the injection apparatus. It is characterized by.

According to the present invention, the injection molding section and the preform take-out section of the preform molding station are arranged in parallel in a direction perpendicular to the injection device, and the blow molding station is arranged in parallel with the injection device, so that the rotation is achieved. Blow molding can be performed without extending the blow molding station in the length direction of the injection device, making effective use of the space beside the injection device within the width of the conveying means. Can be achieved.

[0008] Another injection stretch blow molding apparatus of the present invention comprises:
A preform molding station for injection molding the preform; and a blow molding station for stretch-blow molding the container from the preform, wherein the preform molding station includes an injection molding unit connected to an injection device, and a preform. A preform take-out unit for taking out the preform, and a rotary conveyance unit for rotatably conveying the preform from the injection molding unit to the preform take-out unit, wherein the injection molding unit and the preform take-out unit are orthogonal to the injection device. The injection molding unit is configured to perform injection molding of a plurality of preforms in parallel with the injection device, and the rotary conveying unit is configured to perform the injection molding of the plurality of preforms by a preform removal unit. The blow molding station is arranged in parallel with the injection device and the blow molding station is arranged in parallel with the injection device. The preform is transported along an ejection device.

According to the present invention, a plurality of preforms are injection-molded in parallel with the injection device in the injection molding section of the preform molding station, and the preform is rotated in parallel with the injection apparatus in the preform take-out section by the rotary conveying means. The blow molding is carried out at the lateral position of the injection device without extending the blow molding station by moving the preform along the injection device and performing blow molding. Thus, space saving of the entire apparatus can be achieved and downsizing can be achieved.

[0010] In the present invention, the blow molding station has a plurality of processing sections, and a transport means for transporting the preform or the container to the plurality of processing sections, and the transport means is provided in the blow molding station. It is preferable to be able to move in a direction parallel to the injection device.

By doing so, the transport means
By moving the preform or container in a direction parallel to the injection device, a plurality of processes can be performed by a plurality of processing units, and blow molding can be performed without increasing the width of the device.

[0012] In this case, the plurality of processing units may include a heating unit for heating the preform taken out from the preform removal unit, and a blow unit for blow molding the preform heated by the heating unit into a container shape. It is preferable that the container be a molding part and a container take-out part for taking out the container molded by the blow molding part.

In this manner, a series of steps of heating the preform, blow molding, and taking out the container can be performed along the injection device.

Further, in this case, it is preferable that the transporting means straddles a plurality of processing sections and can be opened and closed with respect to a neck portion of the preform or the container.

In this way, the preform or the container can be repeatedly transported to each processing section with a small number of movements.

In this case, it is preferable that a receiving member for receiving the preform is arranged at the preform take-out section, and the receiving member is movable to the heating section.

In this manner, the preform can be received by the receiving member from the preform take-out section, moved to the heating section, and delivered to the blow molding station.

Further, in this case, it is preferable that the receiving member is a cooling pot.

In this way, when a relatively thick preform is molded or when it is desired to reduce the influence of temperature during injection molding, the preform is cooled by the cooling pot at the preform receiving portion. The preform can be cooled while being received and transferred to the heating unit, and can be efficiently cooled.

In this case, the heating unit includes a heating box disposed above the transporting means, a preform holding means for receiving a preform from the receiving member, a heating position in the heating box, It is preferable to be able to move up and down between the delivery positions to the transfer means.

In this manner, the influence of the heat from the heating box on the conveying means can be prevented. In addition, by raising and lowering the preform holding means, the lifting and lowering operation of the conveying means is eliminated, and The transfer efficiency can be improved.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 are views showing an injection stretch blow molding apparatus according to an embodiment of the present invention.

FIG. 1 is a plan view of an injection stretch blow molding apparatus according to the present embodiment, and FIG. 2 is a side view as viewed from a direction II in FIG.

As shown in the drawings, the injection stretch blow molding apparatus 10 includes a preform molding station 14 for injection molding a preform on a machine base 12, and a blow molding station 16 for stretching blow molding a container from the preform. And are arranged.

As shown in FIG. 1, the preform molding station 14 is provided with an injection device 22 at a position from one side in the width direction of the machine base 12 over the length direction. An injection molding unit 24 and a preform removal unit 26 connectable to the injection device 22 are arranged in parallel in a direction orthogonal to the injection device 22.

Further, in the blow molding station 16, a heating section 60, a blow molding section 62 and a container removal section 64 as a plurality of processing sections are arranged in order from the preform removal section 26 side along the injection apparatus 22, and a straight line is formed beside the injection apparatus 22. It is arranged in a shape.

With such an arrangement, the space beside the injection device 22 is effectively used, and the size of the device is reduced.

More specifically, as shown in FIG. 1, the preform molding station 14 has injection core dies 18 at two positions separated by a rotation angle of 180 degrees, and the injection core dies 18 are arranged along the rotary conveyance path. A rotating plate 20 is provided as a rotating transport unit for intermittently reversing and transporting 18.

At each stop position of the injection core mold 18,
The injection molding unit 24 is located at a position facing the injection device 22.
Is provided, and a preform take-out unit 26 is provided to face the injection molding unit 24.

As shown in FIG. 2, the injection molding section 24 has an injection cavity mold 28 that is driven to clamp relative to the injection core mold 18 and a plurality of, for example, eight preforms 1 ( The heating section 60 in FIG. 2) is simultaneously injection-molded.

More specifically, the injection molding section 24 is provided with a lower clamping plate 30 fixed on the machine base 12, and an upper clamping plate 32 is disposed above the lower clamping plate 30. ing.

The upper clamping plate 32 can be moved up and down along a plurality of tie bars 34.

A fixing plate 36 is provided at the upper end of the tie bar 34, and a mold clamping cylinder 38 provided on the fixing plate 36 is provided.
Thereby, the upper mold clamping plate 32 is driven to move up and down.

The rotating plate 20 is rotatably supported on the lower surface of the upper mold clamping plate 32.
2 is capable of 180-degree inversion driving.

The rotary plate 20 has two rows of injection core dies 18 and preforms 1 arranged in parallel with the injection device 22.
Are supported at positions corresponding to the injection molding section 24 and the preform take-out section 26, respectively.

The injection molding unit 24 includes an injection device 22
And a hot runner mold 44 for nozzle touching is provided,
The injection cavity mold 2 is provided on the hot runner mold 44.
8 is fixed.

The injection cavity mold 28 has the number of simultaneous moldings in the injection molding section 24, for example, eight cavities.

In this embodiment, two injection cavity molds each having four cavities are arranged in series.

The eight cavities are arranged in parallel with the injection device 22. The injection core mold 18 and the neck cavity mold 42 correspond to the eight cavities.
Are arranged in parallel with the injection device 22 even at the position of the preform take-out section 26 while being rotated by 180 degrees.

The preform take-out unit 26 includes the injection molding unit 2
The preform 1 which is provided at a rotation position of 180 degrees with respect to 4 and is conveyed to the preform take-out section 26 is in a state of being arranged in parallel with the injection device 22.

Then, the preform 1 is taken out while being arranged in parallel with the injection device 22.

Specifically, in the preform take-out section 26, the neck portion of the preform 1 is
The preform 1 is held by the neck cavity mold 42 and the injection core mold 18 and is conveyed from the rotating plate 22 to the preform take-out section 26.

In the preform take-out section 26, after the injection core mold 18 is partially released, the preform is released from the neck cavity mold 42 to take out the preform 1.

The neck cavity mold 42 is composed of split dies, and each split die is fixed to a neck fixing plate 46 made of a split plate urged in the closing direction. The preform can be taken out from the neck cavity mold 42 by opening the neck fixing plate 46 by an opening means.

In this embodiment, two neck fixing plates having four neck cavity molds are arranged in series.

Further, the preform take-out section 26 is provided as a receiving member for receiving the preform 1 at a position below the preform 1 corresponding to the position at which the preform 1 is stopped.
The transport cylinders 48 are provided in a line.

These transport cylinders 48 are raised by a lifting device (not shown), and after receiving the preform 1, are lowered.
From the position of the preform removal section 26 on the machine base 12 to the heating section 61 of the blow molding station 16, the preform removal section 26 is placed on a transport rail 50 arranged along the injection device 22, and each transport is performed by the preform removal section 26. Preform 1 in cylinder 48
Can be moved to the heating unit 60 in a state in which is received.

The transport cylinders 48 are divided into four, and each of the four transport cylinders 48 is
By means of 2, the pitch at the time of injection molding at the position of the preform take-out section 26 is widened from the pitch at the time of blow molding at the heating section 60 and the pitch is converted.

The blow molding station 16 includes
A transfer rail 66 from the heating unit 60 via the blow molding unit 62 to the container unloading unit 64 is provided along the injection device 22 at a height position where the movement of the transfer unit 8 is not hindered. Means 68 is mounted for horizontal movement.

The conveying means 68 has a length extending over two processing units, for example, the heating unit 60 and the blow molding unit 62, and the blow molding unit 62 and the container unloading unit 64. Sixteen preforms 1 or containers can be transported and supplied.

Specifically, as partially shown in FIG.
It consists of a pair of plate-like members having a semicircular notch corresponding to the position of the preform 1 or the container, and this plate-like member can be opened and closed with respect to the position of the preform 1 or the container. And convey while supporting the lower surface of the flange formed in the neck portion.

The transport means 68 can be opened and closed with respect to the neck of the preform 1 or the container, and can hold and open the preform 1 or the container.

In the heating section 60, a heating box 72 having an infrared heater 70 is disposed above a conveying rail 66, and a heating core 7 as a preform holding means is provided.
4 can be raised and lowered by a heating core lifting cylinder 76.

The heating core 74 is located at the receiving position A for receiving the preform 1 from the transport tube 48, and at the heating box 7
2, the heating core 74 is inserted into the neck of the preform 1 in the transport tube 48, and the preform 1 is extracted from the receiving position A. After the preform 1 is heated while rotating to the heating position B, the preform 1 is lowered to the delivery position C and delivered to the conveying means 68.

The blow molding section 62 includes a blow cavity mold (not shown) having eight container-shaped cavities which can be clamped by the mold clamping mechanism 78, and a blow cavity by a blow core lifting cylinder 80 and an extension rod lifting mechanism 82. Eight blow core molds 8 inserted into the mold and clamped
4, and at the same time, eight preforms can be blow-molded into a container shape.

The container take-out section 64 allows the eight eject cores 86 to be moved up and down by an eject core elevating cylinder 88. When the carrying means 68 conveys the container to the container take-out section 64, the eject core 86 is moved to the container take-out section. The container is dropped and taken out by opening the transporting means 68 in a state where the container is positioned and positioned.

Further, a take-out belt conveyor 90 is provided below the container take-out section 64 so that the take-out belt conveyor 90 can be taken out of the apparatus.

Next, the injection stretch blow molding apparatus 10 described above is used.
Will be described.

First, the preform molding station 14
In the injection molding section 24, the upper mold clamping plate 32 and the rotary plate 20 are lowered by driving the mold clamping cylinder 38, and the injection core mold 18 and the neck cavity mold 42 are clamped to the injection cavity mold 28. I do.

In this state, the molten resin is injected from the injection device 22 into the injection cavity mold 28 via the hot runner mold 44 and cooled until the preform 1 can be removed from the injection cavity mold. As a result, the upper mold clamping plate 32 and the rotating plate 20 are raised, and the preform 1 is released from the injection cavity mold 28 and taken out.

In this case, since the plurality of preforms 1 are injection-molded in parallel with the injection device 22 by the injection cavity mold 28, the preforms 1 taken out are also arranged in parallel with the injection device 22. Has become.

Next, the rotating plate 20 is driven by the inversion driving means 40.
Is rotated by 180 degrees, the preform 1 is placed at the position of the preform take-out section 26.

In this state, the preform 1 is arranged in parallel with the injection device 22 in a state facing the injection molding section 24.

At this time, the other injection core mold 18 and neck cavity mold 42 are located on the side of the injection molding section 24 and are in a state of being ready for the next injection molding.

Next, when the upper mold clamping plate 32 and the rotating plate 20 are lowered and the injection molding operation of the next cycle is started, the transport cylinder 48 is raised in the preform take-out section 26 and the injection core mold is moved. The preform 1 is released from the mold 18 and accommodated in the transport cylinder 48, and the neck cavity mold 42 is opened via the neck fixing plate 46, and the preform 1 is released and held by the transport cylinder 48.

Next, when the preform 1 is inserted into the transport tube 48, the transport tube 48 descends and
It is conveyed along the line 0 to the heating section 60 of the blow molding station 14 while maintaining the heat retained during injection molding.

At this time, the transport cylinder 48 is
By means of 2, the pitch is converted into a wide pitch by four in accordance with the pitch for blow molding.

In the heating unit 60, when the preform 1 is conveyed, the heating core 74 is lowered to the receiving position A by the heating core elevating cylinder 76, and is inserted into the neck portion of the preform 1 to hold the preform 1 inside. The preform 1 is held, heated to the heating position B and heated while rotating, and then lowered to the transfer position C to transfer the preform 1 to the transport means 68.

At this time, the conveying means 68 is open with respect to the preform 1, and when the preform 1 is lowered to the delivery position C, the conveying means 68 is closed and the neck of the preform 1 is closed. At the same time, the blow molding section 62 also holds the neck of the container held in the blow cavity mold.

Thereafter, the heating core 74 rises to the heating position B, and enters a state of waiting until the next preform 1 is conveyed.

Then, in a state where the blow cavity mold is opened in the blow molding section 62, the conveying means 68 is conveyed to the blow molding section 62 and the container take-out section 64 side, and the blow molded section 62 is heated. 1, the container is conveyed to the container removal section 64.

Next, in the blow molding section 62, the blow cavity mold is clamped to hold the preform 1, and at the same time, the blow molding is performed. In the container take-out section 64, the eject core 86 is moved by the eject core elevating cylinder 88. Is inserted into the neck portion of the container transported by the transporting means 68 and the transporting means 68 is opened while preventing the container from being biased to one side when the transporting means 68 is opened.

When the transport means 68 is opened, the container falls down and is carried out of the apparatus by the take-out conveyor 90.

When the conveying means 68 is moved to the heating section 60 while the conveying means 68 is opened, the preparation for holding the next preform 1 is completed, and the blow molding section 62 A state in which the neck portion of the molded container can be gripped becomes possible, and by repeating the above steps, the injection molding of the preform 1, the blow molding, and the removal of the container can be efficiently performed in a small space.

The present invention is not limited to the above embodiment, but can be modified into various forms within the scope of the present invention.

For example, in the above embodiment, preforms are injection-molded one row at a time, and blow molding is performed for each row of injection-molded preforms.
The present invention is not limited to this, and a plurality of rows of preforms may be injection-molded at the same time, and blow molding may be performed for each row of preforms.

In this case, in the heating section, the preform can be easily taken out for each row by moving the receiving member in a direction intersecting the transport direction.

Further, the number of simultaneously formed preforms is eight, but this number can be changed as appropriate.

Further, in the preform take-out section, the preform is received by the transport cylinder, but various receiving members such as a holding plate capable of inserting and holding the preform can be used.

In this case, by using a cooling pot as the receiving member, it is possible to efficiently cool a relatively thick preform.

Further, as the processing sections of the blow molding station, the heating section, the blow molding section, and the container take-out section have been described.
It is possible to freely increase the number of heating units or omit the heating units.

Further, in the processing section of the blow molding station, each processing may be performed in a state where the preform is inverted. For this purpose, the preform received by the receiving member is turned over by the receiving member. It will be delivered to the heating unit in the state.

[Brief description of the drawings]

FIG. 1 is a plan view of an injection stretch blow molding apparatus according to one embodiment of the present invention.

FIG. 2 is a side view as viewed from a direction II in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Preform 10 Injection stretch blow molding apparatus 14 Preform molding station 16 Blow molding station 20 Rotating plate 22 Injection apparatus 24 Injection molding section 26 Preform removal section 48 Transport cylinder 60 Heating section 62 Blow molding section 64 Container removal section 68 Transport means 72 heating box

Claims (8)

[Claims] 1. A preform molding station for injection molding a preform, and a blow molding station for stretch blow molding a container from the preform, wherein the preform molding station is connected to an injection device by injection molding. Unit, a preform take-out unit for taking out the preform, and a rotary conveying unit for rotationally conveying the preform from the injection molding unit to the preform take-out unit, the injection molding unit and the preform take-out unit, An injection stretch blow molding device, wherein the blow molding station is arranged in parallel with a direction orthogonal to the injection device, and the blow molding station is arranged in parallel with the injection device. 2. A preform molding station for injection molding a preform, and a blow molding station for stretch-blow molding a container from the preform, wherein the preform molding station is connected to an injection device. Unit, a preform take-out unit for taking out the preform, and a rotary conveying unit for rotationally conveying the preform from the injection molding unit to the preform take-out unit, the injection molding unit and the preform take-out unit, The injection molding unit is arranged in parallel in a direction orthogonal to the injection device, the injection molding unit injection-molds a plurality of preforms in parallel with the injection device, and the rotary conveyance unit is configured to perform the injection-molded plurality of preforms. The injection molding device is arranged in parallel with the injection device at a preform take-out section, and the blow molding station is arranged in parallel with the injection device. Injection stretch blow molding apparatus characterized by conveying the preform along the injection apparatus is location. 3. The blow molding station according to claim 1, wherein the blow molding station includes a plurality of processing units and a conveying unit that conveys the preform or the container to the plurality of processing units. An injection stretch blow molding apparatus, which is movable in a molding station in a direction parallel to the injection apparatus. 4. The processing unit according to claim 3, wherein the plurality of processing units are configured to heat a preform taken out from the preform take-out unit, and to blow-mold the preform heated by the heating unit into a container shape. An injection stretch blow molding apparatus, comprising: a blow molding section that performs a blow molding; and a container removal section that takes out a container molded by the blow molding section. 5. The injection stretch blow molding apparatus according to claim 3, wherein the transporting means straddles a plurality of processing units and can be opened and closed with respect to a neck portion of the preform or the container. 6. The injection stretching according to claim 5, wherein a receiving member for receiving the preform is arranged at the preform take-out section, and the receiving member is movable to the heating section. Blow molding equipment. 7. The injection stretch blow molding apparatus according to claim 6, wherein the receiving member is a cooling pot. 8. The heating section according to claim 6, wherein a heating box is disposed above the transporting means, and a preform holding means receives a preform from the receiving member, and a heating position in the heating box. And an injection stretch blow molding apparatus characterized in that it can be moved up and down between delivery positions to the transport means.