JPH07232372A - Parison molding apparatus and method - Google Patents

Abstract

PURPOSE:To achieve the enhancement of workability and the conservation of space by providing core material supply rows consisting of core material receiving and holding parts supplying a large number of heat-resistant resin core materials to a mold apparatus and parison taking-out rows consisting of parison receiving and holding parts to a moving plate and supplying the core materials to the mold apparatus from the core material supply rows. CONSTITUTION:A large number of core materials 1 are delivered to a moving plate 3 at a core material delivery position P from a core material delivery device 2 and the rear surface 3a of the moving plate 3 is reversed by 90 deg. to allow the core materials 1 of core material supply rows 6 to advance toward a mold apparatus 5 through a supply route H to form parisons 4. Next, the empty moving plate 3 is returned to the core material delivery position P to again receive a large number of the core materials l to move to a parison taking-out position B. The parison receiving and holding parts 7 of the moving plate 3 receive the parisons 4 from the mold apparatus 5. Continuously, the moving plate 3 moves to the emptied mold apparatus 5 by a pitch (d) while holds the parisons 4 and supplies the core materials of core material rows A1-A4 to be also used in the taking-out operation of the parisons 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parison molding apparatus and a parison molding method. More specifically, for example, a parison molded from a bottle-forming resin material such as polyethylene terephthalate (PET) is biaxially stretch blow molded. When manufacturing a bottle, a PET bottle in which a heat-resistant resin core material (insert piece) and the bottle-forming resin are combined, and a biaxial orientation is generated at the bottle mouth of a PET bottle that is not biaxially stretched The present invention relates to a novel parison molding apparatus and a molding method for molding a parison having a multi-layer structure of the bottle body forming resin layer and a heat-resistant resin core material, which has the same transparency as that of the bottle body.

[0002]

2. Description of the Related Art Generally, molding of this type of parison is performed by the method shown in FIG.
First, the preformed heat-resistant resin core material 1 is held by clamping the die contact portion with the mouth-forming die 32, and following the die-closing of the mouth-forming die 32, the core The mold 33 and the cavity mold 34 are clamped, and then P
The body portion d (see FIG. 7) is formed by injection-molding the ET resin M from the gate G into the cavity 35, and then the PET resin M is made to wrap around from the inside of the heat-resistant resin core material 1 to the outside of the bottle. Forming the mouth 21. This bottle mouth usually has a three-layer structure in which a heat-resistant resin core material portion is sandwiched by PET resin M.

The parison 3 (see FIG. 7) thus molded is biaxially stretch blow molded to form a PET bottle (not shown).

[0004]

Although a device itself for supplying a preformed heat-resistant resin core material to a parison forming die device is known, a large number of heat-resistant resin core materials are simultaneously used. There has been no conventional parison molding apparatus which can be inserted into the mold apparatus and can take out a large number of parisons from the mold apparatus and simultaneously perform the work of sending the parison to the biaxial stretch blow molding process.

The present invention has been made in view of the above problems, and an object thereof is to provide a parison molding apparatus and a parison molding method having good workability.

[0006]

In order to achieve the above object, the parison molding apparatus of the present invention transfers a pre-molded heat-resistant resin core material to a predetermined position of the parison forming mold device. After inserting into the mold device and clamping the mold device, the bottle forming resin material is introduced into the mold device to mold the body, and then the bottle forming resin material is made of a heat-resistant resin core. A parison forming device for forming a bottle body by biaxially stretch-blowing a parison that forms a bottle mouth combined with a core material. A core material delivery device that mounts and holds many heat-resistant resin core materials. A moving plate to which the large number of heat-resistant resin core materials are delivered via, and a parison-forming mold device for supplying the large number of heat-resistant resin core materials from the moving plate to form a parison. Further, the moving plate is Of the heat-resistant resin core material at the core material insertion position for supplying to the mold device, the core material supply row comprising a plurality of core material receiving and holding parts, and the core material supply row having a predetermined pitch. A parison take-out line formed of a plurality of parison receiving and holding sections for taking out and receiving a plurality of already formed parisons from the mold when the parison is taken out from the mold when moved to the parison take-out position of the mold device. In addition, the moving plate is moved from the parison take-out position to the core material insertion position by a predetermined pitch, and the parison is taken out and emptied into the mold device. It is characterized in that a core material is supplied.

Further, according to another aspect of the present invention, a preformed heat-resistant resin core material is transferred, inserted into a predetermined position of a parison forming mold device, and the mold device is clamped. After that, a bottle-forming resin material is introduced into the mold device to form a body, and subsequently, a parison is formed by forming a bottle mouth in which the bottle-forming resin material is combined with a heat-resistant resin core material. In the parison molding method for forming a bottle by biaxial stretch blow molding, first, a large number of heat-resistant resin core materials are transferred from a core material transfer device that places and holds a large number of heat-resistant resin core materials. The initial core material insertion step of passing the material to the moving plate at the material transfer position and inserting it in the predetermined position of the mold device, and performing the mold clamping after the empty moving plate is separated from the mold device to form the parison. Initial parison forming process and empty moving plate transfer the core material An initial feedback process to return to the position, then,
After the parison forming process is completed and the mold device is opened,
During the moving step in which the moving plate holding a large number of heat-resistant resin core materials transferred by the core material transfer device moves to the parison take-out position of the mold device, and during the transfer process from the open mold device. The parison taking-out step in which the moving plate takes out the plurality of parisons formed in the initial parison forming step, the step of moving the parison at a predetermined pitch to move from the parison taking-out position to the core material insertion position, and the parison is taken out and emptied. In the mold device, a core material supplying step of supplying a heat-resistant resin core material on the moving plate while the moving plate holds the parison, and the moving plate holding the parison is moved to the mold. After the mold is separated from the device, the mold is clamped and the parison is formed in the next moving step until the moving plate moves to the parison take-out position. And the moving plate after being separated from the mold device returns to the core material transfer position, in the middle of the return process, the parison transfer device for the blow molding device transfers the parison received in the parison extraction process to the parison transfer. There is provided a parison molding method, which comprises a step and a step of returning the empty moving plate after the parison is transferred to the parison transfer device to the core material transfer position.

The greatest feature of the present invention is that an operation of supplying a heat-resistant resin core material to a die device for forming a parison on one moving plate and an operation of taking out the formed parison from the die device. The point is that they are both used, and both operations are performed sequentially. Therefore, workability can be improved. That is, it is not necessary to separately provide a jig for taking out the parison from the parison forming die device, and the operability is good because the moving plates can be operated simultaneously by displacing the moving plate by the pitch between the core material feeding line and the parison taking line. . In addition, since there is only one moving plate, the apparatus itself including the control unit can be greatly saved in terms of space.

The moving plate according to the present invention is provided with an operation of supplying a heat-resistant resin core material (hereinafter referred to as a core material) to a parison forming mold device and an operation of taking out the molded parison from the mold device. A single unit is also used, and the moving plate is a core material supply column including a plurality of core material receiving and holding portions for supplying a core material to the mold device,
The core material supply row is formed with a predetermined pitch interval,
And a parison take-out row including a plurality of parison receiving and holding portions for taking out and receiving a plurality of already formed parisons from the mold when the parison is inserted into the mold device.

In the present invention, when attention is paid to the operation of supplying the core material to the parison forming mold device and the operation of taking out the molded parison from the mold, it is roughly classified into the core material for the moving plate at the core material transfer position. For the first time, the initial core material inserting step of inserting the core material into a predetermined position of the parison forming mold device, and the core material transferring device to the empty moving plate during the parison formation in the mold device. In order to supply the core material newly delivered through the mold device after the parison formation is completed and the mold device is opened, first, the moving plate is moved to the parison take-out position of the mold device. A step of removing a plurality of already formed parisons from the mold device; a step of moving the moving plate from the parison taking-out position to the core insertion position by a predetermined pitch; Consisting primarily of the step of inserting the core material into the mold device. Then, after the moving step of inserting the core material into a predetermined position of the mold device for the second time, the parison taking-out step and the core material inserting step are performed while the parison is received and held by the moving plate. This is repeated in sequence by shifting the moving plate by the pitch between the supply line and the parison take-out line. Instead of moving the moving plate, only the core material supply line and the parison take-out line may be moved.

Polyethylene terephthalate (PET) resin can be mentioned as a typical example of the bottle-forming resin material in the present invention, but other resins may be used.

As the heat-resistant resin core material 1 according to the present invention, one has a tubular portion a and a collar portion b, as shown in FIGS. 6 to 8, and has a passage for the bottle-forming resin material M. As an example, there may be mentioned one in which a large number of through holes c are formed in the peripheral wall of the tubular portion a. Therefore, when the bottle-forming resin material M reaches the outside of the tubular portion a from the inside of the tubular portion a through the through hole c, most of the tubular portion a is covered with the bottle-forming resin layers R and T. Thus, the parison 3 whose inner and outer surfaces are sandwiched and embedded is molded.

Further, according to the present invention, as described above, the bottle-forming resin material is formed from the inside of the cylindrical portion a through the through hole c to the outside of the cylindrical portion a from the inside of the core to the outside. The bottle mouth 21 is not limited to the above-described bottle mouth 21, and the bottle mouth 22 formed by forming the bottle body forming resin layer R only inside the tubular portion a (see FIG. 9) or the bottle body only outside the tubular portion. A bottle mouth formed by forming a formed resin layer is also applicable.

[0014]

Embodiments of the present invention will be described below.
However, the present invention is not limited thereby. 1 and 2, a parison molding apparatus P is configured such that a pre-molded heat-resistant resin core material (hereinafter, referred to as a core material) 1 is inserted at a predetermined position of a parison forming mold device and clamped. , Bottle forming resin material (hereinafter referred to as PET resin) M
(See FIG. 6) is introduced into the mold to form the body portion d (see FIG. 7), and then the PET resin M is made to wrap around from the inside of the core material 1 to form the bottle mouth 21. A parison 3 (see FIG. 7) is biaxially stretch blow-molded to form a bottle body (not shown), and a parison delivery device 2 for placing and holding a large number of cores 1 is used. A movable plate 3 to which a large number of core materials 1 are delivered, and a parison forming mold device (hereinafter, simply referred to as a mold device) 5 for supplying a large number of core materials 1 from the movable plate 3 to form a parison 4. Further, the moving plate 3 further comprises a plurality of core material receiving and holding portions 6 for supplying a large number of core materials 1 to the mold device 5, and the core material supply rows A ₁ , A ₂ , A ₃ , A. ₄ , and the core material supply rows A ₁ , A ₂ , A ₃ , and A ₄ are formed with a predetermined pitch interval d. When moving to the parison receiving position B to the device 5, the parison take-out rows C ₁ , C ₂ , which are made up of a plurality of parison receiving and holding parts 7 for taking out and receiving the plurality of parisons 4 already formed, from the mold. C
₃ and C ₄ , and the moving plate 3 has a parison 4
In order to supply the core material 1 from the core material supply line 6 to the mold apparatus 5 which has been taken out and is empty, the core material is moved from the parison receiving position B by the predetermined pitch interval d. Instead of the moving plate, only the core material supply line and the parison take-out line may be moved by the pitch interval d.

Further, as shown in FIG. 3, the parison take-out rows C ₁ , C ₂ , C ₃ , C ₄ and the core material feeding row A ₁ ,
A ₂ , A ₃ , and A ₄ are provided on the lower surface 3a of the moving plate 3, and in this embodiment, the parison take-out rows C ₁ , C ₂ ,
Four rows of C ₃ and C ₄ parison receiving and holding parts 7 are provided,
A corresponding number of core material supply rows A ₁ , A ₂ , A ₃ , and A ₄ are provided with a pitch interval d. The number of receiving and holding portions 7 of the parison take-out rows C ₁ , C ₂ , C ₃ , C ₄ may be a multiple of the core material feeding rows A ₁ , A ₂ , A ₃ , A ₄ . In this case, until the entire parison receiving / holding section holds the parison, the parison is not delivered to the parison delivery device.

The parison receiving / holding portion 7 is provided with a cylindrical body 7 so that the parison 4 can be received / held.
The air suction portion for receiving and holding the parison 4 is provided. In addition, it is more desirable to have a cooling part for cooling the parison 4 because the molding cycle can be increased. On the other hand, in FIG. 3, the core material receiving / holding portion 6 is provided with a chuck member 6a so that the core material 1 can be received / held.

On the other hand, the core material 1 is formed by a core material forming device 8 as shown in FIGS. 1 and 2, and the formed core material 1 is provided with a chuck member (not shown) for extracting the core material. 9
After being held by the robot 9, the core material 1 is delivered from the robot 9 to the core material delivery device 2. At this time, the core material take-out robot 9 coming out of the core material forming device 8 cores the core material 1 in a state of being inverted by 90 ° (Z direction indicated by an arrow) so as to face the delivery surface 2a of the core material delivery device 2. Delivery surface 2 of material delivery device 2
hand it over to a. This delivery surface 2a also receives the core material 1
The chuck member 10 is formed so that it can be held. In both the chuck member of the core material take-out robot 9 and the chuck member 10 of the core material transfer device 2, the arrangement of both chuck members is such that the core material supply line A ₁ ,
The array corresponds to A ₂ , A ₃ , and A ₄ . Then, as shown in FIG. 3, the core material 1 on the transfer surface 2a is transferred to the moving plate 3 from the core material transferring device 2 which has moved the core material transferring path D to the core material transferring position P immediately below the moving plate 3. Be done. At the time of this delivery, while the core material delivery device 2 is in a standby state, the moving plate 3 is lowered in the Q direction by a predetermined distance to move from the chuck member 10 to the core material supply rows A ₁ , A ₂ , A ₂ .
_The core material 1 is delivered to ₃ and A ₄ . Then, the core material delivery device 2 descends in the F direction, returns to the core material delivery path D, and returns to the core material receiving position.

The parison molding method will be described below. In FIG. 2, first, a large number of core materials 1 are transferred from the core material transfer device 2 to the movable plate 3 at the core material transfer position P, and the movable plate 3 moves on the supply path H to the mold device 5 to move the core. The material insertion position B is reached (initial core material supplying step). At this time, in the state where the lower surface 3a of the moving plate 3 is inverted by 90 ° so as to face the mold device 5 (X direction indicated by the arrow), the supply path H to the mold device 5 is moved from the core material transfer position P to the core material. It moves to the insertion position B (see FIG. 4), and then, while advancing the core material 1 of the core material supply row 6 of the moving plate 3 to the mold device 5 side, the mouth part forming die 32 is fitted into the core material 1. Received together
Move backward and fit into the core mold 33. After this, after the moving plate 3 leaves the mold apparatus 5, the cavity mold 34 advances and the mold clamping of the mold apparatus 5 is completed (see FIGS. 5 and 6). Then, the PET resin M is injection-molded from the gate G into the cavity 35 to mold the body portion d (see FIG. 7), and then the PET resin M is made to wrap around from the inside of the heat-resistant resin core material 1 to the outside. Then, the bottle mouth 21 is molded to form the parison 3 as shown in FIG. 7 (initial parison forming step).

After the empty moving plate 3 has returned to the core material delivery position P (initial return step), next, a large number of core materials 1 delivered by the core material delivery device P are again supplied to the mold device 5. In order to do so, the moving plate 3 is moved from the core material transfer position P to the parison take-out position B of the mold device 5 after the parison formation is completed and the mold device 5 is opened (moving step).

Then, again in the mold apparatus 5,
During the moving step, the plurality of parisons 4 formed in the initial parison forming step are taken out from the mold device 5, and the parison 4 is received by the parison receiving and holding section 7 of the moving plate 3 (parison taking out step).

Then, the movable plate 3 is moved by a predetermined pitch d while holding the parison 4 to a predetermined position of the die unit 5 where the parison 4 is taken out and emptied. Core material supply line A ₁ , A ₂ , A ₃ , A
_The core material held in ₄ is supplied (core material supply step). At this time, since the operation of supplying the core material 1 to the mold device 5 and the operation of taking out the parison 4 from the mold device are both performed on one moving plate, and both operations are sequentially performed, workability is improved. Can be improved. That is, there is no need to separately provide a jig for taking out the parison from the parison forming die device, and in the present embodiment, it is only necessary to displace the moving plate 3 by the pitch d between the core material supplying row 6 and the parison taking row 7. Operability is good because it can be operated simultaneously. In addition, since there is only one moving plate, the apparatus itself including the control unit can be greatly saved in terms of space.

Subsequently, the movable plate 3 holding the parison 4 is clamped after the movable plate 3 is separated from the mold apparatus 5, and the movable plate 3 moves to the parison take-out position B in the next moving step. Then, a parison is formed in the same manner as the initial parison forming process (parison forming process).

Next, before the parison forming step, the moving plate 3 after being separated from the mold apparatus 5 returns to the core material transfer position P, and is returned to the parison conveying apparatus 11 for the blow molding apparatus during the returning step. The parison 4 received in the parison take-out step is delivered (parison delivery step). If the parison take-out line is a multiple of the core material supply line, the parison receiving / holding unit returns to the core material delivering position P without delivering the parison to the parison carrier until all parisons receive the parison.

Subsequently, the empty moving plate 3 which has delivered the parison to the parison conveying device 11 returns to the core material delivery position P again. Thereafter, the same operation is sequentially repeated.

Thereafter, the parison 4 is subjected to known biaxially stretch blow molding, and the bottle mouth 2 of the PET bottle which is not biaxially stretched.
1, a bottle body having the same transparency as the bottle body of a PET bottle having biaxial orientation can be formed.

[0026]

As described above, according to the present invention, the moving plate is provided with a core material supply line including a plurality of core material receiving and holding portions for supplying the heat-resistant resin core material to the mold device, and the core material. A plurality of parison receiving devices for forming a plurality of parisons, which are formed with a predetermined pitch interval with respect to the supply line and are moved to the parison take-out position of the mold device, to take out and receive the already-formed parison from the mold device. It consists of a parison take-out row consisting of a holding part, and this one moving plate serves both to supply the heat-resistant resin core material to the mold device and to remove the molded parison from the mold device. In addition, since both operations are sequentially and repeatedly performed, it is not necessary to separately provide a jig for taking out the parison from the mold device, and the moving plate is displaced by the pitch between the core material feeding row and the parison taking row. Only because simultaneous operation in that, there is an effect that the workability can be improved. Further, since there is only one moving plate, there is an advantage that the apparatus itself including the control unit can be greatly saved in terms of space and space can be saved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an overall configuration showing an embodiment of the present invention.

FIG. 2 is a structural explanatory view showing an operation of a moving plate in the above embodiment.

FIG. 3 is an explanatory diagram of a delivery device in the above embodiment.

FIG. 4 is an explanatory diagram of a main part configuration showing a core material mounting step in the above embodiment.

FIG. 5 is an explanatory diagram of a main part configuration showing a mold clamping process of the mold device according to the embodiment.

FIG. 6 is a view showing a mold device.

FIG. 7 is a diagram showing a parison.

FIG. 8 is a view showing a bottle mouth of a parison.

FIG. 9 is a view showing a modified example of the bottle mouth of the parison.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Core material made of heat resistant resin, 2 ... Core material delivery device, 3 ... Moving plate, 4 ... Parison, 5 ... Mold device, 6 ... Core material receiving / holding portion, 7 ... Parison receiving / holding portion, 8 ... Core material Molding device, 9 ... Robot for taking out core material.

Claims (5)

[Claims] 1. A preformed heat-resistant resin core material is transferred, inserted into a predetermined position of a parison forming mold device, and the mold device is clamped, and then the bottle-forming resin material is aforesaid. It is introduced into the mold device to mold the body, and then the parison formed by forming the bottle mouth by combining the bottle-forming resin material with the heat-resistant resin core material is biaxially stretch blow molded to form the bottle body. In a parison forming device for forming a moving plate, a moving plate to which the large number of heat-resistant resin core materials is transferred via a core material transfer device for mounting and holding a large number of heat-resistant resin core materials, and the moving plate. A mold device for forming a parison for forming a parison by supplying the large number of heat-resistant resin core materials from a plate, and the moving plate further includes the large number of heat-resistant resin core materials as a core material. A plurality of core material receiving holders for supplying to the mold device at the insertion position. A core material supply line composed of a holding part is formed with a predetermined pitch interval with the core material supply line, and a plurality of already formed parts are formed when the core material supply line is moved to the parison take-out position of the mold device. Has a parison take-out row consisting of a plurality of parison receiving and holding parts for taking out and receiving the parison from the mold, and further, the moving plate moves the parison from the parison take-out position to the core insertion position by a predetermined pitch to move the parison. A parison molding apparatus, wherein the heat-resistant resin core material is supplied from the core material supply row to the die device that has been taken out and emptied. 2. The mold device comprises a mouth mold, a core mold, and a cavity mold. On the other hand, the parison receiving / holding unit comprises a cylindrical body for receiving and holding the parison, and holds the parison. The parison molding apparatus according to claim 1, further comprising: an air suction unit. 3. A preformed heat-resistant resin core material is transferred, inserted into a predetermined position of a parison-forming mold device, and the mold device is clamped, and then the bottle-forming resin material is subjected to the above-mentioned process. It is introduced into the mold device to mold the body, and then the parison formed by forming the bottle mouth by combining the bottle-forming resin material with the heat-resistant resin core material is biaxially stretch blow molded to form the bottle body. In the parison molding method for forming the core, first, a large number of heat-resistant resin core materials are transferred to the moving plate at the core material transfer position from a core material transfer device that places and holds a large number of heat-resistant resin core materials. An initial core member inserting step of being inserted and attached at a predetermined position of the mold device, an initial moving part of the movable plate is separated from the mold device, and an initial parison forming step of performing mold clamping to form a parison; The initial return step in which the moving plate returns to the core material delivery position, and then After the parison forming process is completed and the mold device is opened, a moving plate holding a large number of heat-resistant resin core materials transferred by the core material transfer device moves to the parison take-out position of the mold device. A moving step, a parison taking-out step in which the moving plate takes out a plurality of parisons formed in the initial parison forming step during the moving step from the open mold device, and a core is moved from the parison taking-out position by moving a predetermined pitch. A step of moving to a material inserting position, and a core material for supplying a heat-resistant resin core material on the moving plate to the mold device in which the parison is taken out and emptied, while the moving plate holds the parison. In the feeding step and after the moving plate holding the parison is separated from the mold device, mold clamping is performed, and the moving plate is moved to the parison take-out position in the next moving step. During the process of forming a parison before moving and the returning process in which the moving plate after leaving the mold device returns to the core material delivery position, the parison transfer device for the blow molding device is used. A parison comprising a parison delivering step of delivering the parison received in the parison taking-out step, and a returning step of returning an empty moving plate after delivering the parison to the parison transfer device to the core material delivering position. Molding method. 4. The moving plate, on the lower surface thereof, a core material supply row, each of which comprises a plurality of core material receiving and holding parts for supplying a large number of heat resistant resin core materials to a mold device, and the core material. The supply row is provided with a parison take-out row formed of a plurality of parison receiving and holding portions each formed with a predetermined pitch interval, and each core material feed row is provided with a heat-resistant resin core from a core material delivering device. The parison molding method according to claim 3, wherein the materials are sorted and held, while the parison is sorted and taken out from the mold in each parison take-out row. 5. The mold device comprises a mouth mold, a core mold, and a cavity mold. On the other hand, the parison receiving / holding unit comprises a cylindrical body for receiving and holding the parison, and holds the parison. The parison molding method according to claim 3 or 4, further comprising an air suction unit for performing the parison molding.