JP3317549B2 - Injection stretch blow molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection stretching method in which at least one cycle of a molding step such as injection molding, stretch blow molding and molded article ejection can be continuously performed by moving a lip mold holding a preform. The present invention relates to a blow molding machine, and more particularly to an injection stretch blow molding machine capable of preventing a lip mold from opening when a mold such as a cavity mold is opened.

[0002]

2. Description of the Related Art Conventionally, as this type of injection stretch blow molding machine, a preform is manufactured by injection molding a plastic, for example, polyethylene terephthalate (PET).
During this injection molding, the preform is cooled and solidified into an amorphous state, then removed from the injection molding machine, and then the preform is preheated to a stretch blow molding temperature by another apparatus and then blow molded. There is known a machine and a one-stage blow molding machine for performing blow molding in the same apparatus while retaining heat during injection molding of an injection-molded preform.

[0003] Among these blow molding machines, one-stage injection stretch blow molding machines have been widely used in the production of plastic containers because they have a small installation area and are advantageous in terms of thermal efficiency and the like.

The one-stage injection stretch blow molding machine includes an injection molding station, a temperature control station,
It is known that a stretch blow molding station and an eject station realize one cycle of a molding process. In the injection stretch blow molding machine, a lip holding a preform is supported by a lip-type support plate, and the lip-type support plate is transferred to each station by a rotary transfer member to perform molding.

In this case, the lip type is constituted by a split type,
Each split mold is attached to a split plate that constitutes a lip-type support plate, and the split plate is urged in the mold-clamping direction of the split mold by the urging force of a spring, and the split mold is maintained in a clamped state. At the injection molding station, temperature control station, stretch blow molding station, etc., the lip mold is moved while the mold is clamped, and the lip mold support plate is separated at the eject station, and the lip mold is separated. The mold is opened to take out the molded product.

In the stretch blow molding station,
The blow cavity mold is a split mold. After blow molding, the blow cavity mold is opened and the molded product is transferred to the next ejection station.

[0007]

In the above-mentioned conventional injection stretch blow molding machine, when stretch blowing PET at a stretch blow molding station, heat setting treatment, that is, in order to increase the heat resistance of the molded article, In some cases, the blow cavity mold is heated to a temperature (for example, 110 to 125 ° C.) or higher (e.g., 110 to 125 ° C.) or higher than the glass transition point of PET (70 to 80 ° C.). When the blow cavity mold is opened in such a condition, the blow molded product adheres to one of the split dies of the blow cavity mold, and the spring urges the lip mold in the mold clamping direction. It is said that the blow molded product opens the lip mold against it, and excessive force is applied to the lip part of the molded product, causing deformation or scratching of the lip part There was a problem.

[0008] In addition to the case of performing such a heat-setting treatment, in the case of performing an annealing treatment for preventing a time-dependent change of a molded product for another purpose, it is necessary to raise the temperature to a temperature higher than the glass transition point of PET. This causes the same problem as in the case of heat setting.

Also, when pre-blowing the preform at the temperature control station, it is necessary to split the temperature control pot and open the mold. There is a problem that the lip is opened by being attached to one of the split molds, and the lip portion of the preform is deformed or damaged. In addition to the case where the pre-blowing is performed, a similar problem may occur when a temperature-adjustable core mold that is in close contact with the heat-shrinkable inner wall of the preform is used.

Further, when there is an undercut portion in the opening direction of the split mold in the preform or the molded product, such as when vertical ribs are formed on the side surfaces of the preform or the molded product, When opening, the preform or molded product moves while being fitted into one of the split molds, opens the lip mold against the urging force of the spring, and the lip of the preform or molded product is deformed or damaged. There was a problem that it would stick. Further, when the preform is in close contact with the core mold when the core mold is pulled out after the injection molding, the split mold is opened by the preform, the preform rises together with the core mold, and a mold release defect may occur. There was a problem.

An object of the present invention is to prevent a preform or a molded product from moving together with one of the split dies at each station when the split die is opened, thereby preventing the lip from being opened. It is another object of the present invention to provide an injection stretch blow molding machine capable of preventing deformation, damage or poor mold release of a lip portion of a preform or a molded product.

[0012]

According to a first aspect of the present invention, there is provided an injection stretch blow molding machine having at least an injection molding station.
If, each station of the stretch blow molding station,
A lip-type support plate made of a split plate that supports a split mold that constitutes a lip portion for holding a lip portion of the preform, and a biasing member that biases the split plate in the mold clamping direction of the split die, In the injection stretch blow molding machine, which comprises a separating and supporting the split plate, the lip mold is circulated to each station, and each mold and a rotary transfer member for clamping are provided.
At the have shifted one station, at the time of mold opening of the cavity mold or core mold disposed in said station, to regulate the mold opening of said pair of split molds are urged in clamping direction by the urging member It is characterized by having mold opening restriction means.

An injection stretch blow molding machine according to a second aspect of the present invention comprises at least an injection molding station and a stretch blow molding machine.
Station and the preform
Division that supports the split mold that constitutes the lip mold for holding the lip
A lip-shaped support plate made of a plate,
A biasing member for biasing in the mold clamping direction;
Removably supports and circulates the lip mold to each station
Equipped with a rotary transfer member that moves, molds, and molds
That in the injection stretch blow molding machine, the stretch blow molding
At the station, the blower installed at the station
When the cavity mold is opened, the urging member clamps the mold.
Mold that regulates the mold opening of the pair of split molds urged in the direction
It is characterized by having opening restriction means.

According to a third aspect of the present invention, there is provided an injection stretch blow molding machine, wherein a temperature control station is provided between the injection molding station and the stretch blow molding station, and a temperature control pot or a temperature control station disposed in the temperature control station. A mold opening restricting means for regulating the mold opening of the pair of split molds urged in the mold clamping direction by the urging member at the time of opening the mold of the tone-adjusting mold is characterized in that the mold opening regulating means is provided.

According to a fourth aspect of the present invention, in the injection stretch blow molding machine, the mold opening restricting means includes a mold opening restricting hole formed in a divided plate constituting a lip-type support plate, and a mold projecting from the rotary transfer member. And a mold opening regulating pin engaged with the opening regulating hole.

According to a fifth aspect of the present invention, in the injection stretch blow molding machine, the mold opening restricting pin is mounted on a core mold fixing plate.

According to a sixth aspect of the present invention, in the injection stretch blow molding machine, the mold opening restricting means includes a lip-type outer peripheral surface provided on an abutting surface with a lip-type outer peripheral surface of a cavity mold or a temperature control pot via an elastic member. It is characterized by comprising a pressing member biased to the side.

[0018]

In the injection stretch blow molding machine according to the first invention, an injection molding station or a stretch blow molding station is provided.
In any one of the stations, the mold of the cavity mold or the core mold arranged in this station is opened. In this case, the mold opening restricting means regulates the mold opening of the lip mold when the cavity mold or the core mold is opened.

Therefore, when the molded product is easily adhered to the cavity mold by heat setting or other annealing treatment at the stretch blow molding station, the mold is opened at the time of opening the cavity mold or the core mold composed of the split mold at the injection molding station. Even when the preform is attached to the cavity mold or the core mold, the lip mold is prevented from opening by the mold opening restricting means. If you try to open the lip mold by attaching it to the cavity mold or core mold, the lip mold does not open.As a result, excessive force is applied to the lip part of the preform or molded product, resulting in deformation of the lip part It can be prevented from being scratched.

In the injection stretch blow molding machine according to the second aspect of the present invention, when the temperature of the blow cavity mold is raised to perform heat setting or other annealing treatment, the opening of the lip mold is effectively prevented. Becomes possible.

In the injection stretch blow molding machine according to the third invention, when the temperature control station has a temperature control pot formed of a split mold, the temperature control pot is opened after the temperature control is completed. In this case, the mold opening restricting means regulates the opening of the lip mold at the beginning of the opening of the temperature control pot.

Therefore, even if the preform is easily stuck to the temperature control pot during temperature control, the lip mold is prevented from opening by the mold opening restricting means. Even if it attaches to one of the split molds of the pot and tries to open the lip mold, the lip mold does not open.As a result, excessive force is applied to the lip part of the preform, and the lip part is deformed. Scratches can be prevented. In addition, even when the temperature control core mold adheres to the inner wall of the heat-shrinkable preform, it prevents the lip mold from opening when the temperature control core mold is pulled out, preventing the preform from rising together with the temperature control core mold. it can.

In the injection stretch blow molding machine according to a fourth aspect of the present invention, the mold opening restricting means is made to protrude from the rotary transfer member with respect to the mold opening restricting hole formed in the divided plate constituting the lip type support plate. With the configuration in which the mold opening regulating pin is engaged, the mold opening can be regulated with a simple structure of engagement between the mold opening regulating pin and the mold opening regulating hole, and the manufacturing cost can be reduced.

In the injection stretch blow molding machine according to the fifth aspect of the present invention, the mold opening regulating pin is attached to the core mold fixing plate, thereby eliminating the need for a dedicated actuator for actuating the mold opening regulating pin. Simplification and cost reduction can be achieved.

In the injection stretch blow molding machine according to the sixth aspect of the present invention, the mold opening restricting means is provided with a pressing member on a contact surface of the cavity mold or the lip mold of the temperature control pot with the pressing member. The elastic member biases the outer peripheral surface side of the lip, so that only the pressing member is provided on the contact surface with the outer peripheral surface of the lip of the cavity mold or the temperature control pot,
There is no need to process the outer peripheral surface of the lip type, so that the manufacturing is easy, and the processing accuracy such as the positional relationship is not required to be so high.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments to which the present invention is applied will be specifically described below with reference to the drawings.

1 to 5 show an injection stretch blow molding machine according to one embodiment of the present invention.

This injection stretch blow molding machine is for molding a plastic container made of, for example, polyethylene terephthalate (PET). As shown in FIG. 1, an injection molding station 10 for performing injection molding of a preform.
And a temperature control station 12 for controlling the temperature of the preform.
And a stretch blow molding station 14 for performing stretch blow molding of the preform to form a plastic container having a predetermined shape, and an eject station 16 for releasing a plastic container as a molded product by releasing the mold. It has become something.

Also, lip-type transfer plates 18 as four rotary transfer members are provided corresponding to the four stations of the injection molding station 10, the temperature control station 12, the stretch blow molding station 14 and the ejection station 16, respectively. I have. A lip-type support plate 20 is attached to each lip-type transfer plate 18,
A lip 22 is attached to the lip support plate 20, and the lip of the preform is held by the lip 22. The lip 22 holding the preform is moved by the rotation of the lip transfer plate 18 to each of the stations 10, 12, 14, 1.
6 is circulated to perform one cycle of the molding process.

As shown in FIG. 2, the lip-shaped support plate 20 is formed in a rectangular shape in which two elongated divided plates 24 are joined in the width direction. In addition, two support portions 26 of the lip mold 22 are formed at positions where the split plates 24 face the mating surface,
Each of the split lip molds 22 is mounted in the support portion 26. Further, an ejection cam (not shown) for releasing is inserted in the ejection station 16 into the mating surface on both end portions of the split plate 24 to insert the lip mold 22.
A wedge hole 27 is formed to separate the holes. Further, each of the split plates 24 is slidably supported at both ends by a guide rail 28, and a return spring 32 is provided on a return rod 30 penetrating the split plate 24, and a biasing force of the return spring 32 is applied. Thus, after separation, it can return to the combined state.

Each split plate 24 of the lip type support plate 20
As shown in FIG. 2, mold opening restricting holes 34 constituting the mold opening restricting means are respectively formed at regular intervals, and these mold opening restricting holes 34 are used to form the mold after the blow molding in the stretch blow molding station 14. At the beginning of the opening of the blow cavity mold, the mold opening of the lip mold 22 is regulated.

More specifically, in the stretch blow molding station 14, as shown in FIGS.
On 6, a blow cavity mold 38 is mounted so as to be mold-clampable. That is, the split mold 42 divided into right and left by the mold clamping cylinder 40 is mold-clamped and the mold can be opened, and the upper bottom mold 46 which can be moved up and down by the upper bottom cylinder 44 is provided at the bottom. The mold can be closed and the mold can be opened. Note that the upper part of the split mold 42 is clamped to the outer peripheral surface of the lip mold 22. Although not shown, the blow cavity mold 38 has a temperature (1 ° C. or higher) equal to or higher than the glass transition point of PET in order to increase the heat resistance of the molded product.
(10 to 125 ° C.).

The blow core 48 is vertically movable by a blow core fixing plate 52 which can be moved up and down by a blow core vertical cylinder 50. The inner peripheral surface of the lip mold 22 is located below the blow core 48. It is designed to be clamped. The blow core type upper and lower cylinder 50
The extension rod 54 and the extension rod vertical cylinder 5
6 also moves up and down at the same time as the blow core mold 48, and the stretching rod 54 can be vertically moved by the stretching rod vertical cylinder 56 to stretch the preform 58 in the longitudinal direction.

Then, the lip-type support plate 20 is fixed to the blow-core-type fixing plate 52 to which the blow-core type 48 is fixed.
A mold opening restricting pin 60 which forms a mold opening restricting means and engages with the mold opening restricting hole 34 formed in the above.

Specifically, the mold opening restriction pin 60 is
A fixing block 62 is attached to a position corresponding to the mold opening regulating hole 34 on the lower surface of the blow core type fixing plate 52 so as to straddle each of the dividing plates 24 constituting the lip-type support plate 20. It protrudes corresponding to the interval of the mold opening restriction hole 34 formed in the plate 24.

Next, the state in which the opening of the lip mold 22 is restricted in the stretch blow molding station 14 of this embodiment will be described.

First, after the preform injection-molded at the injection molding station 10 is transferred to the temperature control station 12 and temperature-controlled, the lip-type transfer plate 18 is rotated and the lip-type support plate 20 is stretch blow-molded. The lip 22 is transferred to the station 14 and positioned at the stretch blow molding station 14. In this state, the lip type 2
2 is urged in the mold clamping direction via the lip-type support plate 20 by the urging force of the return spring 32, and the mold clamped state is maintained.

Next, the blow core type vertical cylinder 50 is operated to lower the blow core type 48 via the blow core type fixing plate 52, and the upper bottom type cylinder 44 is operated to raise the upper bottom type 46. In this case, as the blow core-type fixing plate 52 descends,
At the same time, and engages with the mold opening regulating hole 34 formed in the lip-type support plate 20 to regulate the mold opening of the lip mold 22.

Next, the mold clamping cylinder 40 is operated,
The blow cavity mold 38 is clamped. In this state, the blow cavity mold 38, the blow core mold 48 and the lip mold 22 are clamped.

In this state, the stretching rod vertical cylinder 56 is operated to lower the stretching rod 54, thereby extending the preform 58 in the vertical axis, and blowing air from the blow core mold 48 to perform the horizontal axis stretching. After the preform 58 is formed in conformity with the shape of the blow cavity mold 38, blow air is exhausted from the blow core mold 48.

Next, the blow cavity mold 38 is opened by the mold clamping cylinder 40, and the upper bottom mold 46 is lowered by the upper bottom cylinder 44. When the blow cavity mold 38 is opened, the lip mold support plate 20 cannot be separated due to the engagement between the mold opening regulating pin 60 and the mold opening regulating hole 34, and the lip mold 22 is maintained in the mold clamped state. Therefore, even when the surface of the molded product 64 is in a state in which the surface of the molded product 64 easily sticks to the blow cavity mold 38 by the heat setting process, the molded product 64 is pulled by the close contact of the lip mold 22 to the blow cavity mold 38. The molded article 62 can be released from the blow cavity mold 38 without causing the lip mold 22 to open.
Can be reliably prevented from being deformed or damaged in the lip portion of the molded product 64 when the mold is forcibly opened.

The mold opening restricting pin 60 is attached to the blow core type fixing plate 52,
Together with the mold opening regulating hole 34 formed in the lip mold supporting plate 20 to regulate the mold opening of the lip mold 22, so that a dedicated actuator for operating the mold opening regulating pin 60 is required. Instead, the structure can be simplified and the cost can be reduced.

After the blow cavity mold 38 is opened, the blow core mold 48 is moved upward by the blow core mold vertical cylinder 50. At the same time, the blow core mold fixing plate 52 rises and the mold opening regulating pin 60 rises, and the lip mold support is raised. The restriction on the opening of the plate 20 is released. In this state, the lip mold transfer plate 18 is rotated to transfer the lip mold 22 to the eject station 16 and remove the molded product 64.

FIG. 6 is a diagram showing another embodiment of the present invention.

In this embodiment, the case where preliminary blowing is performed in the temperature control station 12 is shown.

The temperature control pot 66 in the temperature control station 12 is constituted by a split mold, and the split mold is clamped below the lip mold 22 supported by the lip mold support plate 20 so that the mold can be opened. . Further, the temperature control core mold 68 is fixed to the temperature control core type movable plate 70 by the temperature control core type fixing plate 72, and the lip mold 22 and the mold clamp are formed by moving the temperature control core type movable plate 70 up and down. It can be opened. A blow air outlet 74 for pre-blowing the preform 58 is formed on the lower surface of the temperature control core mold 68, and the preform 58 is brought into close contact with the inner surface of the temperature control pot 66 in which the mold is clamped to perform temperature control. It has become.

Further, on the lower surface of the temperature control core type movable plate 70 at a position corresponding to the mold opening regulating hole 34 formed in the lip type support plate 20, the mold opening regulating pin 60
Is mounted by projecting, and when the temperature control core mold 68 is closed by lowering the temperature control core type movable plate 70, the mold opening control pins 60 are engaged with the mold opening control holes 34 of the lip type support plate 20. At the time of opening the temperature control pot 66 after the temperature control,
The surface of the preform 58 is in close contact with the inner surface of the temperature control pot 66 and the lip mold 22 is forcibly opened to form the preform 5.
The lip portion 8 is prevented from being deformed or damaged. Moreover, the mold opening restriction pin 60 is
As the temperature-adjustable core-type movable plate 70 moves up and down as it moves up and down, no special actuator is required.

FIG. 7 is a diagram showing still another embodiment of the present invention.

In this embodiment, as the mold opening restricting means,
For example, the outer peripheral surface 8 of the lip mold 22 of the blow cavity mold 80
A spring 86 as an elastic member is
, A ball 88 as a pressing member urged toward the outer peripheral surface 82 of the lip mold 22 is provided. Specifically, these springs 86 and balls 88 are mounted in advance in a pipe 90, and a plurality of pipes 90 on which the springs 86 and balls 88 are mounted can be attached in the circumferential direction of the contact surface 84. . In addition, the pipe 90 equipped with the spring 86 and the ball 88 is
It is not always necessary to mount a plurality in the circumferential direction of the contact surface 84, and it is sufficient that at least one piece is provided in the circumferential direction of each split mold.

Therefore, even when the opening of the blow cavity mold 80 starts when the blow cavity mold 80 is opened,
At the beginning of the mold opening, the ball 88 protrudes from the contact surface 84 toward the outer peripheral surface 82 of the lip mold 22 to prevent the lip mold 22 from opening.

As a result, even if the molded product 64 is in close contact with the blow cavity mold 80, the molded product 64 forcibly opens the lip mold 22 and deforms or scratches the lip portion. Can be prevented. In this case, the outer peripheral surface 82 of the lip 22
In this case, there is no need to perform processing, and it is not necessary to consider the positional relationship between the ball 88 and the contact portion so much. Therefore, the manufacturing is easy and the processing accuracy is not required to be so high. The present embodiment can be applied to a temperature control pot instead of the blow cavity mold 80.

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

For example, in the above-described embodiment, a case has been described in which a flat lip-type transfer plate is used as the rotary transfer member. However, the present invention is not limited to this example, and a rotary arm and other rotary transfer members can be employed. It is.

In the above embodiment, the case where the lip-type support plate does not move up and down has been described. However, the present invention is not limited to this example, and is applicable to the case where the lip-type support plate moves up and down.

Further, in the above-described embodiment, the case where the lip-type mold opening restricting means is used in the stretch blow molding station or the temperature control station has been described. However, the present invention is not limited to this example. When a vertical rib is formed on the side surface of the preform, there is an undercut portion in the mold opening direction of the split mold in the preform. For example, as shown in JP-A-4-138214, the injection cavity mold is referred to as a split mold. What is known is. Then, when the split mold is opened, the preform moves while being fitted into one of the split molds, opens the lip mold against the urging force of the spring, and the lip portion of the preform is deformed, In order to prevent scratching, it is possible to use a lip type mold opening restricting means in the injection molding station. In addition to the case where the split cavity mold is used, it is also possible to prevent the preform from adhering to the core mold and lifting the preform together with the core mold when the core mold is pulled out.

Further, although the mold opening restricting pin constituting the mold opening restricting means is moved by the off-the-shelf moving means, the present invention is not limited to this example. It is also possible to

Further, the case of preliminary blowing at the temperature control station has been described. However, the present invention is not limited to this. It is possible to prevent the mold from opening.

[0058]

As described above, according to the first aspect of the present invention, when the molded product is easily attached to the cavity mold by heat setting or other annealing treatment at the stretch blow molding station, the injection molding is performed. Even if the preform adheres to the cavity or core mold when opening the cavity or core mold consisting of split molds at the station, the lip mold is prevented from opening by the mold opening restriction means Because the preform and molded product adhere to the cavity mold and core mold and try to open the lip mold, the lip mold does not open. There is an effect that it is possible to prevent the lip portion from being deformed or damaged due to excessive force applied to the lip portion.

According to the second aspect of the invention, when the temperature of the blow cavity mold is raised to perform heat setting or other annealing treatment, there is an effect that the mold opening of the lip mold can be effectively prevented.

In the third aspect of the present invention, even when the preform is easily attached to the temperature control pot during temperature control, the lip type is prevented from being opened by the mold opening restriction means. Therefore, even if the preform adheres to one of the split molds of the temperature control pot and tries to open the lip mold, the lip mold does not open, and as a result, excessive force is applied to the lip portion of the preform. Deformation of the part,
There is an effect that scratching can be prevented. In addition, even when the temperature control core mold adheres to the inner wall of the heat-shrinkable preform, it prevents the lip mold from opening when the temperature control core mold is pulled out, preventing the preform from rising together with the temperature control core mold. There is an effect that can be.

According to the fourth aspect of the present invention, the opening of the mold can be restricted by a simple structure in which the opening-regulating pin and the opening-regulating hole are engaged, so that there is an effect that the manufacturing cost can be reduced.

According to the fifth aspect of the present invention, by attaching the mold opening restricting pin to the core mold fixing plate, a dedicated actuator for operating the mold opening restricting pin is not required, thereby simplifying the structure and reducing the cost. There is an effect that can be done.

In the sixth aspect of the present invention, it is not necessary to process the outer peripheral surface of the lip mold only by providing the pressing member on the contact surface of the cavity mold or the temperature control pot with the outer peripheral surface of the lip mold. It is easy to manufacture, and there is an effect that processing accuracy such as positional relationship is not required to be so high.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a lip type support plate for holding a lip type in the injection stretch blow molding machine shown in FIG.

FIG. 3 is a cross-sectional view of the stretch blow molding station shown in FIG.

FIG. 4 is an enlarged sectional view of a main part of the stretch blow molding station shown in FIG.

FIG. 5 is a side sectional view of FIG. 3;

FIG. 6 is a sectional view showing another embodiment of the present invention.

FIG. 7 is a sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Injection molding station 10 Injection molding station 12 Temperature control station 14 Stretch blow molding station 16 Eject station 18 Lip type transfer plate 20 Lip type support plate 22 Lip type 30 Return rod 32 Return spring 34 Mold opening restriction hole 38, 80 Blow Cavity mold 48 Blow core mold 58 Preform 60 Mold opening regulating pin 64 Molded product 66 Temperature control pot 68 Temperature control core 82 Outer peripheral surface 84 Contact surface 86 Spring 88 Ball

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 49/00-49/80

Claims (6)

(57) [Claims] 1. A lip-type support plate comprising at least an injection molding station , a stretch blow molding station , a split plate for supporting a split die constituting a lip for holding a lip portion of a preform, A rotating member for urging the plate in the mold clamping direction of the split mold, supporting the split plate in a separable manner, circulating the lip mold to each station, and clamping the mold with each mold; in the injection stretch blow molding machine and a member at the have shifted one station, at the time of mold opening of the cavity mold or core mold disposed in said station, which is urged in clamping direction by the urging member An injection stretch blow molding machine comprising a mold opening restricting means for restricting the opening of the pair of split dies. 2. An injection molding station, comprising:
Each of the stretch blow molding stations and a lip mold for holding the lip of the preform
A lip-type support plate comprising a split plate for supporting a mold, and an urging member for urging the split plate in a direction of clamping the split die.
The split plate is supported so as to be separable and the lip type
Is circulated to each station and clamped with each mold.
Injection stretch blow molding machine equipped with a rotary transfer member
At the stretch blow molding station,
When opening the blow cavity mold installed in
Of the pair of split molds urged by the urging member in the mold clamping direction.
It is characterized by having mold opening regulation means to regulate mold opening
Injection stretch blow molding machine. 3. The temperature control pot or temperature control core type mold opening according to claim 1, wherein a temperature control station is provided between the injection molding station and the stretch blow molding station. An injection stretch blow molding machine, characterized in that the injection stretching blow molding machine further comprises a mold opening restricting means for regulating the mold opening of the pair of split dies which are urged in the mold clamping direction by the urging member. 4. The mold opening restricting means according to claim 1, wherein the mold opening restricting means includes a mold opening restricting hole formed in a dividing plate constituting a lip-type support plate, and the mold opening protruding from the rotary transfer member. An injection stretch blow molding machine, comprising: a mold opening regulating pin engaged with a regulating hole. 5. The injection stretch blow molding machine according to claim 4, wherein the mold opening restriction pin is attached to a core mold fixing plate. 6. The lip type outer peripheral surface side according to claim 1, wherein the mold opening restricting means is provided on an abutting surface of the cavity type or the temperature control pot with the lip type outer peripheral surface via an elastic member. An injection stretch blow molding machine, characterized by comprising a pressing member urged against.