JPH06335959A - Injection stretch blow molding machine - Google Patents

Abstract

PURPOSE:To provide the molding machine preventing the deformation or damage of the lip part of a preform or molded product at the time of the opening of split molds. CONSTITUTION:Split molds constituting lip molds 22 for holding the lip part of a preform are supported on the dividing plates 24 constituting a lip mold support plate 20 and the dividing plates 24 are supported on a lip mold transfer plate 18 so as to be energized in the clamping direction of the split molds and made separable mutually and the lip molds 22 are circulated and moved to respective stations by the lip mold transfer plate 18 to be clamped along with respective molds to constitute one cycle. In a stretch blow molding station, a blow cavity mold 38 consisting of split molds 38 is provided and, at the beginning of the opening of the blow cavity mold 38 after blow molding, the opening prescribing hole 34 formed to the lip mold support plate 20 is engaged with the opening restricting pin 60 attached to a blow core mold fixing plate to restrict the opening of the lip molds 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection drawing in which at least one cycle of molding steps such as injection molding, stretch blow molding and molded article ejection can be continuously performed by moving a lip mold for 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 the lip mold from opening when a mold such as a cavity mold is opened.

[0002]

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

Of these blow molding machines, the one-stage injection stretch blow molding machine has a small installation area and is advantageous in terms of thermal efficiency and the like, so that it is becoming popular in the manufacture of plastic containers.

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

In this case, the lip type is a split type,
Each split mold is attached to a split plate that constitutes a lip-type support plate, and the split plate is biased in the split mold clamping direction by the biasing force of a spring to maintain the split mold clamping state. It is detachably attached to the rotary transfer member, and at injection molding stations, temperature control stations, stretch blow molding stations, etc., the lip mold is moved in the mold clamped state, and the lip mold support plate is separated at the eject station to separate the lip mold. The mold is opened and the molded product is taken out.

At the stretch blow molding station,
The blow cavity mold is composed of split molds, and after blow molding, the blow cavity mold is opened to transfer the molded product to the next eject station.

[0007]

In the conventional injection stretch blow molding machine, in the stretch blow molding station, when the PET is stretch blown, heat set treatment, that is, in order to increase the heat resistance of the molded product, In some cases, the blow cavity mold may be heated to a temperature (for example, 110 to 125 ° C.) higher than the glass transition point of PET (70 to 80 ° C.), and in such a case, the surface of the blow molded product becomes the blow cavity mold. If the blow cavity mold is opened in such a state, the blow molded product will stick to one of the split molds of the blow cavity mold, and the spring force that biases the lip mold in the mold clamping direction will be applied. By contrast, the blow-molded product opens the lip mold, and the lip part of the molded product is subjected to unreasonable force, which may cause deformation or damage to the lip part. There was a problem.

Not only in the case of performing such heat setting treatment, but also in the case of performing an annealing treatment for preventing the time-dependent change of the molded article for other purposes, it is necessary to raise the temperature above the glass transition point of PET. Therefore, the same problem as in the case of heat setting will occur.

Further, even when the preform is pre-blown at the temperature control station, it is necessary to open the mold by splitting the temperature control pot. Even in such a case, the surface of the preform is the temperature control pot. There is a problem that the lip mold is opened by adhering to one of the split molds and the lip portion of the preform is deformed or scratched. In addition to the case of performing the pre-blowing, there is a possibility that the same problem may occur in the case of having the temperature control core mold that adheres to the inner wall of the preform that has been heat-shrinked.

Furthermore, when there is an undercut portion in the mold opening direction of the preform or the molded product such as when vertical ribs are formed on the side surface of the preform or the molded product, the mold of the split mold is used. When opening, the preform or molded product moves while still fitted in one of the split molds, opening the lip mold against the urging force of the spring, and the lip part of the preform or molded product is deformed or scratched. There was a problem that it was attached. Also, when the core mold is pulled out after injection molding, if the preform is in close contact with the core mold, the split mold may be opened by the preform, and the preform may rise together with the core mold, resulting in mold release defects. There was a problem.

Therefore, an object of the present invention is to prevent the preform and the molded product from moving together with one of the split molds at the time of opening the split mold at each station, thereby preventing the lip mold from opening. Another object of the present invention is to provide an injection stretch blow molding machine capable of preventing deformation, scratches, release defects and the like of the lip portion of a preform or a molded product.

[0012]

The injection stretch blow molding machine according to the first invention is at least an injection molding station,
A split mold, which comprises a stretch blow molding station and an eject station and constitutes a lip mold for holding the lip portion of the preform, is supported by a split plate which constitutes a lip mold support plate, and the split plate is split by a biasing member. The mold is clamped by urging the mold in the mold clamping direction and supporting the dividing plate in a separable manner by a rotary transfer member, and circulatingly moving the lip mold to each station by this rotary transfer member. By doing so, in the injection stretch blow molding machine for carrying out the molding process of one cycle, at any one of the stations except the eject station, at the time of mold opening of the cavity mold or the core mold arranged at the station,
It is characterized by further comprising mold opening restricting means for restricting the mold opening of the pair split mold which is biased in the mold clamping direction by the biasing member.

The injection stretch blow molding machine according to the second invention is characterized in that the cavity mold is a blow cavity mold.

In the injection stretch blow molding machine according to the third aspect of the present invention, 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 arranged at the temperature control station is provided. It is characterized by further comprising mold opening restricting means for restricting the mold opening of the pair of split molds biased in the mold clamping direction by the biasing member at the time of mold opening of the adjusting core mold.

In the injection stretch blow molding machine according to the fourth aspect of the present invention, the mold opening restricting means includes a mold opening restricting hole formed in a split plate constituting a lip mold supporting plate, and the mold protruding from the rotary transfer member. It is characterized in that it is provided with a mold opening regulating pin which is engaged with the opening regulating hole.

An injection stretch blow molding machine according to a fifth aspect of the present invention is characterized in that the mold opening restricting pin is attached to a core mold fixing plate.

In the injection stretch blow molding machine according to the sixth aspect of the present invention, the mold opening restricting means has a lip mold outer peripheral surface via an elastic member on a contact surface of the cavity mold or the temperature control pot with the lip mold outer peripheral surface. It is characterized in that it is provided with a pressing member biased to the side.

[0018]

In the injection stretch blow molding machine according to the first aspect of the invention, in any one station except the eject station, the cavity mold or the core mold arranged in this station is opened. In this case, the mold opening regulation means regulates the mold opening of the lip mold when the cavity mold or the core mold is opened.

Accordingly, when the molded product is in a state of easily sticking to the cavity mold by heat setting or other annealing treatment in the stretch blow molding station, at the time of opening the cavity mold or the core mold composed of the split mold in the injection molding station. Even when the preform is attached to the cavity mold or the core mold, the lip mold is in a state in which the mold opening is prevented by the mold opening restricting means, so that the preform and the molded product are Even if you try to open the lip mold by adhering to the cavity mold or core mold, the lip mold will not open, and as a result, the lip part of the preform or molded product will be forced and deformed. It is possible to prevent scratches and scratches.

In the injection stretch blow molding machine 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, the lip mold is effectively prevented from opening. Is possible.

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

Therefore, even when the preform is in a state of easily sticking to the temperature control pot during temperature control, the lip mold is in a state in which the mold opening is prevented by the mold opening restricting means, so that the temperature of the preform is controlled. Even if it adheres to one of the split molds of the 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 and the lip portion is deformed, It is possible to prevent scratches. In addition, even when the temperature control core mold adheres to the heat-shrinked inner wall of the preform, the lip mold is prevented 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 the fourth aspect of the present invention, the mold opening restricting means is caused to protrude from the rotary transfer member with respect to the mold opening restricting hole formed in the split plate constituting the lip mold supporting plate. By adopting a structure in which the mold opening restriction pin is engaged, the mold opening can be restricted by a simple structure in which the mold opening restriction pin and the mold opening restriction hole are engaged, and the manufacturing cost can be reduced.

In the injection stretch blow molding machine according to the fifth aspect of the invention, by mounting the mold opening regulating pin on the core mold fixing plate, a dedicated actuator for actuating the mold opening regulating pin is not required, and the structure is improved. It is possible to simplify and reduce the cost.

In the injection stretch blow molding machine according to the sixth aspect of the present invention, the mold opening regulating means is provided with a pressing member on the contact surface of the cavity mold or the temperature control pot with the outer peripheral surface of the lip mold. By urging the elastic member toward the outer peripheral surface of the lip mold, simply by providing a 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 not necessary to process the outer peripheral surface of the lip die, and therefore the manufacturing is easy, and the processing accuracy such as the positional relationship is not required to be so high.

[0026]

Embodiments to which the present invention is applied will be described below in detail with reference to the drawings.

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

This injection stretch blow molding machine is for molding a plastic container made of, for example, polyethylene terephthalate (PET), and as shown in FIG. 1, an injection molding station 10 for injection molding a preform.
And a temperature control station 12 that controls 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 the plastic container as a molded product from the mold. It has become a thing.

Corresponding to the four stations of the injection molding station 10, the temperature control station 12, the stretch blow molding station 14 and the eject station 16, four lip transfer plates 18 as rotary transfer members are provided respectively. There is. A lip type support plate 20 is attached to each lip type transfer plate 18,
A lip die 22 is attached to the lip die support plate 20, and the lip portion of the preform is held by the lip die 22. Then, the lip die 22 holding this preform is rotated by the lip die transfer plate 18 so that the stations 10, 12, 14, 1
6 is cyclically moved to perform one cycle of the molding process.

As shown in FIG. 2, the lip type support plate 20 is formed in a rectangular shape in which two elongated split plates 24 are aligned in the width direction. Further, two support portions 26 of the lip mold 22 are formed at the positions facing the mating surfaces of the split plates 24,
The lip dies 22 composed of split dies are mounted in the support portions 26, respectively. Further, an eject cam (not shown) for release at the eject station 16 is inserted into the mating surfaces on both end sides of the dividing plate 24 so that the lip mold 22
A wedge hole 27 is formed to separate the two. Further, both ends of each of the split plates 24 are slidably supported by the guide rails 28, and a return spring 32 is provided on the return rod 30 that penetrates the split plate 24, and the return spring 32 has a biasing force. After the separation, the combined state can be restored.

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

Specifically, in the stretch blow molding station 14, as shown in FIGS.
A blow cavity mold 38 is mounted on the mold 6 so that it can be clamped. That is, the split mold 42 divided into the right and left by the mold clamping cylinder 40 is clamped to be able to open the mold, and the bottom mold 46, which is vertically movable by the top mold cylinder 44, is provided at the bottom. The mold can be clamped and the mold can be opened. 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 than the glass transition point of PET, for example, in order to improve the heat resistance of the molded product.
The temperature is raised to 10 to 125 ° C.

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

Then, from the blow core type fixing plate 52 fixing the blow core type 48 to the lip type supporting plate 20.
A mold opening restricting pin 60, which is a mold opening restricting means and is engaged with the mold opening restricting hole 34 formed in FIG.

Specifically, the mold opening regulating pin 60 is
A fixed block 62 is attached to a position corresponding to the mold opening restricting hole 34 on the lower surface of the blow core type fixed plate 52 so as to extend over each divided plate 24 constituting the lip type support plate 20. The protrusions are formed so as to correspond to the intervals of the mold opening regulation holes 34 formed in the plate 24.

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

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

Next, the blow core type upper and lower cylinders 50 are 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, the mold opening restricting pin 60 attached to the lower end of the lip mold 22 is lowered and engages with the mold opening restricting hole 34 formed in the lip mold supporting plate 20 to restrict 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 draw rod up-and-down cylinder 56 is operated to lower the draw rod 54 to draw the preform 58 in the vertical axis, and at the same time, the blow core mold 4 is drawn.
After blowing blow air from No. 8 to perform transverse axis stretching, the preform 58 is shaped to conform to the shape of the blow cavity mold 38, and then blow air is exhausted from the blow core mold 48.

Next, the mold cavity cylinder 40 opens the blow cavity mold 38, and the upper bottom mold cylinder 44 lowers the upper bottom mold 46. During the mold opening of the blow cavity mold 38, the lip mold support plate 20 becomes inseparable due to the engagement between the mold opening restricting pin 60 and the mold opening restricting hole 34, and the lip mold 22 is maintained in the mold clamped state. Therefore, even if the surface of the molded product 64 is easily stuck to the blow cavity mold 38 due to the heat setting process, the lip mold 22 is closely attached to the blow cavity mold 38 so that it is pulled by the molded product 64. The molded product 62 can be released from the blow cavity mold 38 without causing the situation that the lip mold 22 is opened by the mold, and as a result, the molded product 64 becomes the lip mold 22.
Therefore, it is possible to reliably prevent the lip portion of the molded product 64 from being deformed or damaged when the mold is forcedly opened.

The mold opening restricting pin 60 is attached to the blow core type fixing plate 52, and the blow core type fixing plate 52 is attached.
Along with this, a special actuator for actuating the mold opening restricting pin 60 is required in order to restrict the mold opening of the lip mold 22 by engaging with the mold opening restricting hole 34 formed in the lip mold supporting plate 20. Therefore, the structure can be simplified and the cost can be reduced.

After the blow cavity mold 38 is opened, when the blow core mold upper and lower cylinders 50 raise the blow core mold 48, at the same time, the blow core mold fixing plate 52 rises and the mold opening regulating pin 60 rises to support the lip mold. The mold opening restriction of the plate 20 is released. In this state, the lip die transfer plate 18 is rotated to convey the lip die 22 to the eject station 16 and take out the molded product 64.

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

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

The temperature control pot 66 in the temperature control station 12 is composed of a split mold, and the split mold is clamped under the lip mold 22 supported by the lip mold support plate 20 so that the mold can be opened. . Further, the temperature control core type 68 is attached and fixed to the temperature control core type movable plate 70 by the temperature control core type fixing plate 72, and the temperature control core type movable plate 70 is moved up and down to clamp the lip type 22 and the die. It is openable. 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 temperature control is performed by bringing the preform 58 into close contact with the inner surface of the temperature control pot 66 in which the mold is clamped. It is like this.

Further, a mold opening restriction pin 60 is provided via a fixed block 62 on the lower surface of the temperature control core type movable plate 70 at a position corresponding to the mold opening restriction hole 34 formed in the lip type support plate 20.
Is projected and attached, and at the time of mold clamping of the temperature control core mold 68 by lowering the temperature control core mold movable plate 70, by engaging the mold opening restriction pin 60 with the mold opening restriction hole 34 of the lip mold support plate 20, After opening the temperature control pot 66,
The surface of the preform 58 comes into close contact with the inner surface of the temperature control pot 66, and the lip mold 22 is forcibly opened to preform 5
The lip portion of 8 is prevented from being deformed or damaged. Moreover, the mold opening regulation pin 60 is
Since the temperature control core type movable plate 70 moves up and down as it moves up and down, a dedicated actuator is not 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 attached to the contact surface 84 with the second member.
A ball 88 as a pressing member urged to the outer peripheral surface 82 side of the lip mold 22 is disposed via the. Specifically, the springs 86 and the balls 88 are mounted in the pipe 90 in advance, and a plurality of pipes 90 on which the springs 86 and the balls 88 are mounted can be mounted in the circumferential direction of the contact surface 84. . The pipe 90 on which the spring 86 and the ball 88 are mounted is
It is not always necessary to mount a plurality of abutting surfaces 84 in the circumferential direction, and at least one is required in the circumferential direction of each split mold.

Therefore, even if the opening of the blow cavity mold 80 is started during the opening of the blow cavity mold 80,
At the beginning of the mold opening, the balls 88 project toward the outer peripheral surface 82 side of the lip mold 22 from the contact surface 84 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 the lip is deformed or scratched. It is possible to prevent the occurrence. Further, in this case, the outer peripheral surface 82 of the lip mold 22
Need not be processed, and the positional relationship between the ball 88 and its abutting portion need not be considered so much, so that the manufacturing is easy and the processing accuracy is not required to be so high. Note that this 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 gist of the present invention.

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

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

Further, in the above-mentioned 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, but the present invention is not limited to this example and, for example, a preform (not shown) is used. If the preform has an undercut portion in the mold opening direction, such as when vertical ribs are formed on the side surface of the mold, the preform is fitted into one of the mold halves when the mold is opened. The lip mold is opened at the injection molding station in order to prevent the lip part of the preform from being deformed or scratched by moving while holding it and opening the lip mold against the biasing force of the spring. It is also possible to use the mold opening regulation means. Further, it is possible to prevent the preform from adhering to the core mold and rising together with the core mold when the core mold is pulled out, other than the case of using the split type cavitity mold.

Further, although the mold opening restricting pin constituting the mold opening restricting means is moved by the ready-made moving means, the invention is not limited to this example, and the independent moving means may be used to operate independently. It is also possible to

Further, the case of pre-blowing at the temperature control station has been described, but the present invention is not limited to this, and even when the temperature control core mold is in close contact with the inner wall of the heat-shrinkable preform, the lip is removed when the temperature control core mold is pulled out. It is possible to prevent the mold from opening.

[0058]

As described above, according to the first aspect of the present invention, in the case where the molded product is easily stuck to the cavity mold due to heat setting or other annealing treatment in the stretch blow molding station, injection molding is performed. Even when the preform adheres to the cavity mold or the core mold when the mold or the cavity mold consisting of split molds is opened at the station, the lip mold prevents the mold opening by the mold opening restricting means. Since the preform or molded product adheres to the cavity mold or core mold and tries 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 scratched by applying excessive force to the lip portion.

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

According to the third aspect of the present invention, even when the preform is easily stuck to the temperature control pot during temperature control, the lip mold is in a state in which the mold opening is prevented by the mold opening restricting 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 will not open, and as a result, the lip portion of the preform will be forced with excessive force. Deformation occurs in the part,
There is an effect that it can be prevented from being scratched. In addition, even when the temperature control core mold adheres to the heat-shrinked inner wall of the preform, the lip mold is prevented from opening when the temperature control core mold is pulled out, preventing the preform from rising together with the temperature control core mold. The effect is that you can do it.

According to the fourth aspect of the invention, there is an effect that the mold opening can be restricted by a simple structure of engaging the mold opening restricting pin and the mold opening restricting hole, and the manufacturing cost can be reduced.

According to the fifth aspect of the present invention, by mounting the mold opening regulating pin on the core mold fixing plate, a dedicated actuator for actuating the mold opening regulating pin is not required, which simplifies the structure and reduces the cost. It has the effect of being able to do it.

According to the sixth aspect of the invention, the pressing member is provided only on the contact surface of the cavity mold or the temperature control pot with the outer peripheral surface of the lip mold, and it is not necessary to process 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 drawings]

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

FIG. 2 is a perspective view showing a lip die support plate that holds a lip die in the injection stretch blow molding machine shown in FIG.

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

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

5 is a side sectional view of FIG.

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]

 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 Type Opening Restriction Holes 38, 80 Blow Cavity type 48 Blow core type 58 Preform 60 Mold opening control pin 64 Molded product 66 Temperature control pot 68 Temperature control core 82 Outer peripheral surface 84 Abutment surface 86 Spring 88 Ball

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[Procedure amendment]

[Submission date] May 13, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

The injection stretch blow molding machine according to the first invention is at least an injection molding station,
Each of the stretch blow molding station and the eject station, a lip type support plate made of a split plate that supports a split mold that constitutes a lip mold for holding the lip portion of the preform, and the split plate are clamped to the split mold. Injection stretch blow molding having an urging member for urging in the direction, rotatably moving the lip mold to each station by supporting the split plate in a separable manner, and each mold and a rotation transfer member for clamping the mold. In the machine, in any one of the stations except the ejecting station, the pair of split members biased in the mold clamping direction by the biasing member at the time of opening the cavity type or the core type disposed in the station. It is characterized by having a mold opening restricting means for restricting the mold opening of the mold.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0055

[Correction method] Change

[Correction content]

Further, in the above-mentioned 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, but the present invention is not limited to this example and, for example, a preform (not shown) is used. When a preform has an undercut portion in the mold opening direction, such as a case where a vertical rib is formed on the side surface of the injection mold, the injection cavity mold is divided into molds as in Japanese Patent Laid-Open No. 4-138214. What is known is. Then, at the time of opening the split mold, the preform moves while being fitted into one of the split molds, the lip mold is opened against the biasing force of the spring, and the lip portion of the preform is deformed, In order to prevent scratches or the like, it is possible to use a lip-type mold opening restricting means in the injection molding station. It is also possible to prevent the preform from adhering to the core mold and rising together with the core mold when the core mold is drawn out, other than the case of using the split mold cavity mold.

Claims (6)

[Claims] 1. A split mold, which comprises at least an injection molding station, a stretch blow molding station, and an eject station, and which constitutes a lip mold for holding a lip portion of a preform, is supported by a dividing plate which constitutes a lip mold supporting plate, The split plate is urged in the mold clamping direction of the split mold by a biasing member, and the split plate is detachably supported by a rotary transfer member, and the rotary transfer member circulates the lip mold to each station. In an injection stretch blow molding machine that carries out one cycle of the molding process by moving and clamping each mold, in any one station except the eject station, the cavity arranged in that station Restricts the mold opening of the pair of split molds biased in the mold clamping direction by the biasing member when the mold or core mold is opened. Injection stretch blow molding machine, characterized in that it comprises a mold opening restricting means. 2. The injection stretch blow molding machine according to claim 1, wherein the cavity mold is a blow cavity mold. 3. The temperature control station according to claim 1, 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 core type mold opening disposed in the temperature control station is opened. At the same time, the injection stretch blow molding machine is characterized by further comprising mold opening restricting means for restricting the mold opening of the pair of split molds biased in the mold clamping direction by the biasing 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 split plate forming a lip mold supporting plate, and the mold opening protruding from the rotation transfer member. An injection stretch blow molding machine, comprising: a mold opening restriction pin engaged with the restriction 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 mold outer peripheral surface side according to any one of claims 1 to 3, wherein the mold opening restricting means is provided on the contact surface of the cavity mold or the temperature control pot with the outer peripheral surface of the lip mold via an elastic member. An injection stretch blow molding machine, comprising: a pressing member biased to.