JP2015093472A - Blow molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of blow-molding a blow molding having a built-in part which enables attachment of the built-in part to the parison through sufficient holding power.SOLUTION: A blow molding method comprises opening a blow molding mold 20, inserting a blow molding inner frame attached with a built-in part 10 into a parison 8, bringing the parison into contact with a blow molding split-mold cavity 21a, attaching the built-in part 10 to an inner frame part holding part 23, with an inner frame part holding part sliding core 23b retracted, pressing a part of the built-in part 10 formed with an attachment hole 12 to the parison 8, so as to cause a part of the parison 8 to flow, from the attachment hole 12, into a space formed by retraction of the inner frame part holding slide core 23b, causing the inner frame part holding part sliding core 23b to slide to press the flowed-in parison 8 toward the surrounding inner surface of the attachment hole 12, causing the parison 8 to hold surfaces on both sides of the attachment hole 12 and attaching the built-in part 10 to the inside of a blow molding.

Description

The present invention relates to a blow molding method in which a blow molded product in which a built-in component is attached is molded from a parison using a blow molding die.

Conventionally, as a structure of a hollow blow-molded product, for example, a fuel tank for an automobile or the like, a metal one has been used. However, in recent years, the weight of a vehicle is reduced, rust is not generated, and a desired shape is used. For example, a hollow thermoplastic synthetic resin has come to be used because of its easy molding.

In the production of a hollow product made of a thermoplastic synthetic resin, a blow molding method has been often used because of the ease of molding a hollow body. In the blow molding method, a parison of a molten thermoplastic synthetic resin member is formed into a cylindrical shape and extruded from above, and the parison is sandwiched between molds and air is blown into the parison to produce a hollow body.

On the other hand, in the blow molding method, it is sometimes required to provide a blow molded product, for example, a built-in component such as a valve or a baffle plate for suppressing fuel flow noise inside the fuel tank.
Therefore, when a built-in component is provided inside the blow molded product, a manufacturing apparatus as shown in FIG. 12 is used (see, for example, Patent Documents 1 and 2). The built-in component 110 is held in the cavity of the blow molding die 120 by the built-in component holding rod 141, the parison 8 is lowered, and then the built-in component 110 is sandwiched by the slide core 126, and the blow molding die 120 is held. Is closed, and the parison 8 is sandwiched between pinch plates 135 to form a blow molded product.

However, in this case, when the built-in component 110 becomes large, the built-in component 210 is held in the parison 8 when the built-in component 210 held by the built-in component holding rod 241 is molded by the blow mold 220 as shown in FIG. The built-in component 210 is held by the holding rod 241, the built-in component holding rod 241 is slid, the built-in component 210 is inserted, and then the built-in component 210 is held by the slide core 226. Therefore, the thickness of the parison 8 to be fused with the built-in component 210 is reduced, and the impact resistance may be lowered.

Further, in order to increase the fusion force between the built-in component 210 and the parison 8, a protrusion or pin is formed on the welding surface of the built-in component 210 with the parison 8 and pressed into the parison 8. The wall thickness of the parison 8 is reduced by the amount of entering the inside, and the impact resistance may be reduced.

For this reason, as shown in FIG. 14, the built-in component 310 is attached to the middle frame component holding portion 323 of the blow-molded inner frame, and the built-in component 310 is pressed against the parison 8 by the middle frame component holding portion 323. In a method of attaching the component 310, there is a method in which a protrusion 312 is provided on the contact surface of the built-in component 310 with the parison 8 and a through hole 311 is provided in the center of the protrusion 312 (see, for example, Patent Document 3).

In this case, when the built-in component 310 is attached to the parison 8, the built-in component 310 is pressed against the parison 8, the melted parison 8 is caused to flow into the through hole 311, and the built-in component 310 is fixed to the parison 8.
However, in this case, since the parison 8 flows along the shape of the through hole 311 and solidifies as it is, a sufficient holding force cannot be obtained unless the inflow amount of the parison 8 is large. In order to increase the number, the built-in component 310 needs to greatly enter the inside of the parison 8, and the wall thickness of the parison 8 is reduced.

Japanese Patent Laid-Open No. 9-174670 JP-A-8-72129 Special table 2009-525893

  Therefore, the present invention provides a blow molding method for a blow molded product having a built-in component, in which the built-in component can be attached to the parison with a sufficient holding force. This is the issue.

The present invention of claim 1 for solving the above-mentioned problem is a blow molding method for molding a blow molded product in which a built-in component is attached from a parison using a blow molding die.
The blow molding mold has a blow molding split mold that is divided into two at the parting line, and when the cavity for forming the blow molded product is formed on the open / close surface and the blow molding split mold is opened A blow molding middle frame located between the blow molding split molds,
An inner frame part holding part for mounting the built-in part on the blow molding middle frame is provided, and the middle frame part holding part is a middle frame part holding part cylinder that holds the built-in part and is driven to move forward and backward in the blow molding split cavity. And an inner frame part holding part slide core that slides in and out of the inside of the inner frame part holding part cylinder,
A built-in part with a mounting hole on the surface that contacts the parison is attached to the middle frame part holder cylinder,
Blow molding inner frame with a blow molding die opened at the parting line, a parison that is cut into a cylindrical shape or two pieces is located in the part where the blow molding split mold cavity is opened, and a built-in part is attached inside the parison Insert
The parison is brought into contact with a blow molding split mold cavity formed by dividing it into two at the parting line,
The part where the built-in part is attached to the middle frame part holding part with the slide core of the middle frame part holding part cylinder and the middle frame part holding part cylinder is slid to form the mounting hole for the built-in part To the parison,
A part of the parison is allowed to flow into the space formed by the retraction of the inner frame part holding part slide core from the mounting hole of the built-in part
After that, slide the inner frame component holding part slide core in the direction of the parison, press the inflow parison against the inner surface around the mounting hole of the built-in component, and the parison clamps the surfaces on both sides of the mounting hole of the built-in component. A blow molding method for a blow molded product having a built-in component, wherein the built-in component is attached to the inside of the blow molded product.

According to the first aspect of the present invention, in the blow molding method in which a blow molded product in which a built-in component is attached is molded from a parison using a blow mold, the blow mold is divided into two parts by a parting line. During blow molding, which has a blow molding split mold formed by dividing, and a cavity for forming a blow molded product is formed on the opening / closing surface, and the blow molding split mold is located when the blow molding split mold is opened A frame is provided. For this reason, a built-in component can be attached to a frame during blow molding, and a built-in component can be attached in a parison.

An inner frame part holding part for mounting the built-in part on the blow molding middle frame is provided, and the middle frame part holding part is a middle frame part holding part cylinder that holds the built-in part and is driven to move forward and backward in the blow molding split cavity. And an inner frame part holding part slide core that slides in the inner frame part holding part cylinder so as to freely advance and retract. For this reason, the built-in component can be pressed against the parison by the middle frame component holding portion cylinder, and a gap is formed between the built-in component and the middle frame component holding portion by sliding the middle frame component holding portion slide core. Can do.

Since the built-in part with the mounting hole formed on the surface abutting against the parison is attached to the inner frame part holding part cylinder, the inner part is pressed against the melted parison by the inner frame part holding part cylinder during blow molding, A part can flow into the built-in components.

Blow molding inner frame with a blow molding die opened at the parting line, a parison that is cut into a cylindrical shape or two pieces is located in the part where the blow molding split mold cavity is opened, and a built-in part is attached inside the parison Inserted. For this reason, it is possible to open the blow molding die, position the parison between the blow molding split molds, insert the built-in component inside the parison by the blow molding inner frame, and attach the built-in component to the inner surface of the parison. .

Since the parison is brought into contact with the blow molding split mold cavity formed by dividing the parison into two parts, the parison can be molded according to the shape of the blow molding split mold cavity, and the parison is blow molded. Holding by the split mold cavity, the built-in component can be pressed against the parison by the middle frame component holder cylinder.

The part where the built-in part is attached to the middle frame part holding part with the slide core of the middle frame part holding part cylinder and the middle frame part holding part cylinder is slid to form the mounting hole for the built-in part Was pressed against the parison. For this reason, a space for allowing the parison to flow between the built-in component mounting hole and the middle frame component holding portion cylinder can be provided, and the built-in component can be pressed against the melted parison. In addition, after attaching a built-in component to the middle frame component holding part, the middle frame component holding part slide core may be retracted.

In order to allow a part of the parison melted from the mounting hole of the built-in component to flow into the space formed by the retraction of the inner frame component holding part slide core, the parison is brought into contact with both sides of the surface provided with the mounting hole of the built-in component. The parison and both sides of the built-in component can be welded.

After that, slide the inner frame component holding part slide core in the direction of the parison, press the inflow parison against the inner surface around the mounting hole of the built-in component, and the parison clamps the surfaces on both sides of the mounting hole of the built-in component. Install the built-in parts inside the blow-molded product. Therefore, the parison flowing from the mounting hole of the built-in component can be pressed against the inner surface of the built-in component to form a rivet-shaped head, and the surface on which the mounting hole of the built-in component is formed has a wide area. Can be firmly sandwiched and fused from both sides.

The present invention of claim 2 is a built-in component that sucks air from the space with a vacuum pump when a part of the parison is caused to flow from the mounting hole of the built-in component into the space formed by retreating the middle frame component holding part slide core. It is a blow molding method of a blow molded product having

According to the second aspect of the present invention, when a part of the parison is caused to flow from the mounting hole of the built-in component into the space formed by the retraction of the middle frame component holding portion slide core, air is sucked from the space by the vacuum pump. For this reason, it is easy to flow the parison from the mounting hole of the built-in component into the space formed by the retraction of the middle frame component holding part slide core, and a predetermined amount of parison can be surely flowed.

The present invention of claim 3 is a blow molding method of a blow molded product having a built-in component provided with a plurality of middle frame component holding portions for attaching the built-in component to the blow molded frame.

According to the third aspect of the present invention, since a plurality of middle frame part holding portions for attaching the built-in parts to the blow-molded middle frame are provided, a plurality of built-in parts can be attached at the same time. It can be easily mounted in the parison by being held by the frame component holding portion.

According to a fourth aspect of the present invention, when the parison is brought into contact with a blow molding split mold cavity formed by being divided into two by a parting line, an air vent hole is provided in the blow molding split mold cavity. This is a blow molding method of a blow molded product having a built-in component in which air is sucked from a punched hole and the parison is brought into close contact with the blow molding split mold cavity.

In this invention of Claim 4, when a parison is made to contact | abut to the blow molding split mold cavity divided | segmented into two by the parting line, an air vent hole is provided in the blow molding split mold cavity, Air was sucked from the punched hole to bring the parison into close contact with the blow mold split mold cavity. For this reason, the parison adheres to the blow mold split mold cavity and is securely molded into the shape of the cavity, and the parison is stably held, and the built-in components can be securely pressed against the parison and attached. it can

According to the fifth aspect of the present invention, the inner frame component holding part slide core is slid in the direction of the parison, and the inflow parison is pressed against the inner surface around the mounting hole of the built-in component, and the surfaces on both sides of the mounting hole of the built-in component After the parison is sandwiched and the built-in part is mounted inside the blow molded product, the blow molding inner frame is taken out from between the blow molding split molds, and the blow molding split mold is closed and blow molded with the built-in parts. Product blow molding method.

In the present invention of claim 5, the inner frame component holding part slide core is slid in the direction of the parison, the inflow parison is pressed against the inner surface around the mounting hole of the built-in component, and both sides of the mounting hole of the built-in component Was attached to the inside of the blow-molded product, and the blow-molded inner frame was taken out from between the blow-molded molds, and the blow-molded mold was closed and blow-molded. For this reason, a parison can be shape | molded with a blow molding die, with a built-in component attached inside.

Slide the inner frame part holding part slide core in the direction of the parison, press the inflowing parison against the inner surface around the mounting hole of the built-in part, and hold the both sides of the mounting hole of the built-in part with the parison. Install the parts inside the blow-molded product. For this reason, the parison that has flowed from the mounting hole of the built-in component can be pressed against the inner surface of the built-in component to form a rivet-shaped head, and can be firmly sandwiched and fused from both sides over a wide area. it can.

It is a fuel tank perspective view shape | molded by embodiment of this invention. It is a schematic diagram of the die core which extrudes the parison used in embodiment of this invention, and the slide cutter which cut | disconnects the parison 8. FIG. The blow molding device used in an embodiment of the present invention is a cross-sectional view of a process for producing a blow molded product, and shows a state in which a parison has entered a blow molding mold and a middle frame component holding part has entered the parison. It is sectional drawing. It is sectional drawing of the process in which the blow molding apparatus used by embodiment of this invention manufactures a blow molded product, and is sectional drawing which shows the state which adsorb | sucked the parison to the blow molding split mold cavity. The blow molding apparatus used in the embodiment of the present invention is a cross-sectional view of a process for producing a blow molded product, in which a parison is adsorbed to a blow molding split mold cavity, and a built-in component is pressed against the parison by an inner frame component holding portion. It is sectional drawing which shows the state which carried out. The blow molding apparatus used in the embodiment of the present invention is a cross-sectional view of a process for producing a blow molded product, wherein the built-in component is attached to the parison at the middle frame component holding portion, and the middle frame component holding portion is blow molded middle frame It is sectional drawing which shows the state made to retreat to. The blow molding apparatus used in the embodiment of the present invention is a cross-sectional view of a process for producing a blow molded product, wherein the blow molded middle frame is taken out from the blow molding split mold, and the blow molded split mold is closed and blow molded. It is sectional drawing shown. It is sectional drawing of the state which attached the built-in component to the middle frame component holding | maintenance part used by embodiment of this invention. It is sectional drawing of the state which attached the internal component to the middle frame component holding | maintenance part used by embodiment of this invention, retracted the middle frame component holding | maintenance part cylinder, and pressed the internal component against the parison. A built-in component is attached to the middle frame component holder used in the embodiment of the present invention, the built-in component is pressed against the parison, and the parison that has flowed into the built-in component is pressed against the inner surface of the built-in component by the middle frame component holder cylinder. FIG. It is sectional drawing of the state which retracted the inner frame components holding | maintenance part used by embodiment of this invention from the built-in components. It is a perspective view of the apparatus with which the slide core and drive control pin of the conventional blow molding apparatus manufacture a blow molded product. It is sectional drawing of the process of manufacturing the blow molded product of the other conventional blow molding apparatus, and is sectional drawing which shows the state which the parison entered in the blow molding die. It is sectional drawing of the process of manufacturing the blow molded product of the other conventional blow molding apparatus, and is sectional drawing which shows the state just before making a built-in component contact | abut to a parison. It is sectional drawing of the process of manufacturing the blow molded product of the other conventional blow molding apparatus, and is sectional drawing which shows the state in which a part of parison flowed in the inside of a built-in component.

With respect to the blow molding method of the blow molded product in which the built-in component 10 is attached inside the embodiment of the present invention, the blow molding method for manufacturing the fuel tank 1 for automobiles which is a blow molded product is taken as an example, and FIGS. Based on The present invention will be described by taking a method of molding the fuel tank 1 having the built-in component 10 as an example, but it can also be used for blow molding methods of other blow molded products having the built-in component 10.

FIG. 1 is a perspective view of a fuel tank 1 manufactured by a blow molding method according to an embodiment of the present invention.
In the embodiment of the present invention, a fuel tank 1 manufactured by a blow molding apparatus has a pump unit mounting hole 4 for taking a fuel pump (not shown) and the like into and out of the fuel tank 1 as shown in FIG. Is formed on the upper surface. A fuel injection hole 5 for injecting fuel from an inlet pipe (not shown) is formed on the side surface or the upper surface of the fuel tank 1.

An outer peripheral rib 2 is formed around the entire circumference of the fuel tank 1, and mounting holes 3 are formed at predetermined locations such as corner portions of the outer peripheral rib 2. The fuel tank 1 is attached to the vehicle body by bolting 3 and the vehicle body.
Furthermore, on the upper surface of the fuel tank 1, there are formed attachment holes 6 at various places for connecting a hose or the like for collecting the internal fuel vapor.

The fuel tank 1 molded in the present embodiment is manufactured by a blow molding manufacturing apparatus to be described later. The outer wall of the fuel tank 1 is formed by blow molding, and the outer wall is formed by one layer or multiple layers. In the case of multiple layers, for example, a skin layer, an external body layer, an external adhesive layer, a barrier layer, an internal adhesive layer, and an internal body layer are formed in order from the outside.

Inside the fuel tank 1, for example, a pillar for reinforcing the fuel tank 1, a partition plate for preventing the generation of undulation noise, a fuel pump, A box or the like for mounting a canister or the like is attached as the built-in component 10.
The built-in component 10 can be formed of a fuel-resistant thermoplastic synthetic resin such as polyacetal or high-density polyethylene (HDPE). As a result, the strength of the fuel tank 1 can be improved, and even if the fuel tank 1 is attached to the inside of the fuel tank 1, the rigidity does not decrease due to swelling by the fuel oil or the like.

Regarding the blow molding method according to the embodiment of the present invention, a method for molding the fuel tank 1 by blow molding will be described with reference to FIGS.
The blow molding apparatus used in the embodiment of the present invention includes a die core 40 for extruding the parison 8, a parison holding apparatus 30 for holding the parison 8, and a blow molding die 20 for molding a blow molded product. Has been.

As shown in FIG. 2, the die core 40 extrudes the parison 8. The extruded parison 8 is cut into two pieces in the vertical direction by the cutter 41, sent downward by the roller 42, and then cut in the horizontal direction by the slide cutter 43. As shown in FIG. 3, the cut parison 8 is held at the tip by the parison holding device 30 and moved to the blow mold 20.
In addition, the parison 8 can be moved to the blow molding die 20 by being cut in the horizontal direction while being cut into two pieces without being cut into two pieces.

The blow molding die 20 has a blow molding split mold 21 formed by dividing it into two parts at a parting line, and a blow molding split mold cavity 21a for forming a fuel tank 1 as a blow molded product on the opening / closing surface. Is formed. Further, a blow molding middle frame 22 is provided between the blow molding split molds 21 when the blow molding split mold 21 is opened.

The blow molding middle frame 22 has a middle frame part holding part 23 to which the built-in part 10 is attached. As shown in FIG. 8, the middle frame component holding part 23 holds the built-in component 10 and is driven to move forward and backward in the direction of the blow molding split cavity 21 a, and the middle frame component holding part 23. An inner frame part holding part slide core 23b is provided that slides in the inside of the part cylinder 23a so as to freely advance and retract. Therefore, as will be described later, the built-in component 10 can be pressed against the parison 8 by the middle frame component holding portion cylinder 23a, and the middle frame component holding portion is interposed between the built-in component 10 and the middle frame component holding portion 23. A central empty chamber 23c can be formed.

The blow molding middle frame 22 can be provided with a plurality of middle frame component holding portions 23 for mounting the built-in component 10. In this case, a plurality of built-in components 10 can be attached at the same time, and even in the case of a large built-in component 10, a plurality of attachment portions are provided on the built-in component 10, and the plurality of attachment portions are respectively provided with a plurality of middle frame component holding portions. By holding at 23, it can be easily mounted in the parison 8.

As shown in FIG. 3, the parison 8 moved to the blow molding die 20 is positioned between the blow molding split mold 21 formed by dividing the blow molding die 20 at the parting line and opened to the left and right. To do.
Thereafter, in the case of the parison 8 cut into two sheets, a blow molding middle frame 22 with the built-in component 10 attached inside is formed between the two parisons 8 and in the case of the cylindrical parison 8 in the cylindrical shape. insert.

Next, as shown in FIG. 4, the blow molding split mold 21 is closed with the blow molding middle frame 22 in between. At that time, the parison 8 is cut by the slide cutter 31 of the parison holding device 30 and sandwiched between the upper ends of the blow molding split mold 21 and the blow molding middle frame 22.
Thereafter, air is sucked from the blow molding split mold air vent hole 21b of the blow molding split mold 21 to bring the parison 8 into close contact with the blow molding split mold cavity 21a. Thereby, the parison 8 is shaped along the blow molding split mold cavity 21a.

At this time, air can be blown from the blow molding middle frame air blowing hole 22a of the blow molding middle frame 22. In this case, it can be performed in combination with sucking air from the blow molding split mold air vent hole 21b, or only sucking air from the blow molding split mold air vent hole 21b, or from the blow molding split mold air vent hole 21b. It is also possible to only suck air. By performing both together, the parison 8 can be further brought into close contact with the blow molding split mold cavity 21a.

Next, as shown in FIG. 5, the inner frame component holding part cylinder 23 a to which the built-in component 10 is attached is slid in the direction of the parison 8 to press the built-in component 10 against the parison 8. At this time, since the parison 8 is in close contact with the blow molding split mold cavity 21a, the built-in component 10 can be reliably pressed against the parison 8.

At this time, as shown in FIG. 8, the middle frame component holding part 23 retracts the middle frame part holding part slide core 23 b of the middle frame part holding part cylinder 23 a to provide the middle frame part holding part central empty space 23 c. In this state, the built-in component 10 is attached to the middle frame component holding portion 23. In addition, after attaching the built-in component 10 to the middle frame component holding portion 23, the middle frame component holding portion cylinder 23a may be retracted to form the middle frame component holding portion central empty space 23c.

As shown in FIG. 8, the built-in component 10 has a mounting hole 12 formed at the center of the contact surface 11 that contacts the parison 8.
Thereafter, the inner frame component holding part cylinder 23 a was slid to press the abutting surface 11 formed with the mounting hole 12 of the built-in component 10 against the parison 8. As a result, as shown in FIG. 9, a part of the parison 8 in a molten state flows from the mounting hole 12 into the middle frame component holding portion central empty space 23 c to form a parison bulging portion 8 a.

At this time, the air in the middle frame component holding portion central empty chamber 23c can be sucked by the vacuum pump from between the middle frame component holding portion cylinder 23a and the middle frame component holding portion slide core 23b. In this case, the parison 8 can easily flow from the mounting hole 12 of the built-in component 10 into the middle frame component holding portion central empty space 23c, and a predetermined amount of the parison 8 can be surely flowed.

Next, as shown in FIG. 10, the middle frame part holding part slide core 23b slides so as to press the parison bulging part 8a. If it does so, the parison 8 can pinch | interpose the both surfaces of the contact surface 11 in which the attachment hole 12 of the built-in component 10 was formed, and the built-in component 10 can be firmly attached to the parison 8.

Therefore, the parison 8 that has flowed from the mounting hole 12 of the built-in component 10 can be pressed against the inner surface of the contact surface 11 of the built-in component 10 to form a rivet-shaped head. The contact surface 11 on which 12 is formed can be firmly sandwiched and fused from both sides over a wide area. For this reason, the built-in component 10 can be firmly attached inside the fuel tank 1 which is a blow molded product.

Thereafter, as shown in FIG. 11, the middle frame component holder 23 moves backward while the built-in component 10 is attached to the parison 8.
Then, as shown in FIG. 6, air is sucked from the blow molding split mold air vent hole 21b, and the blow molding split mold 21 is opened while the parison 8 is in close contact with the blow molding split mold cavity 21a. The middle frame 22 is taken out from the blow molding split mold 21.

Further, as shown in FIG. 7, the blow molding split mold 21 is closed, and the parison 8 is held while the built-in component 10 is attached to the parison 8. The blow pin 21c is pierced into the parison 8, and air is blown into the blow molding split mold cavity 21a to perform blow molding.
After blow molding, the blow molding split mold 21 is opened, the parison 8 is taken out, burrs and the like are cut off, and the fuel tank 1 which is a blow molded product is molded.

DESCRIPTION OF SYMBOLS 1 Fuel tank 8 Parison 10 Built-in part 20 Blow molding die 21 Blow molding split mold 22 Blow molding middle frame 23 Middle frame part holding part 23a Middle frame part holding part cylinder 23b Middle frame part holding part slide core 30 Parison holding device 40 Die core

Claims (5)

In a blow molding method for molding a blow molded product in which a built-in component is attached from a parison using a blow molding die,
The blow molding die has a blow molding split mold formed by dividing it into two at a parting line, a cavity for forming the blow molded product is formed on the opening and closing surface, and the blow molding split mold is Provide a blow molding middle frame located between the blow molding split molds when opened,
An intermediate frame component holding portion for mounting the built-in component is provided on the blow-molded intermediate frame, and the intermediate frame component holding portion is driven to move forward and backward in the direction of the blow molding split mold cavity while holding the internal component. A frame part holding part cylinder, and a middle frame part holding part slide core that slides in and out of the inside of the middle frame part holding part cylinder;
Attach the built-in component with a mounting hole on the surface that contacts the parison to the middle frame component holder cylinder,
The blow molding die is opened at the parting line, the parison cut into a cylindrical shape or two pieces is located in the part where the blow molding split cavity is opened, and the built-in component is placed in the parison. Insert the attached blow molding inner frame,
The parison is brought into contact with the blow molding split mold cavity formed by being divided into two at the parting line,
The built-in component is attached to the middle frame component holding portion of the middle frame component holding portion cylinder in which the middle frame component holding portion slide core is retracted, and the middle frame component holding portion cylinder is slid to Press the part where the mounting hole is formed against the parison,
A part of the parison is caused to flow into the space formed by retreating the middle frame part holding part slide core from the mounting hole of the built-in part,
Thereafter, the inner frame component holding part slide core is slid in the direction of the parison, and the inflowed parison is pressed against the inner surface around the mounting hole of the built-in component, and the surfaces on both sides of the mounting hole of the built-in component are pressed. A blow molding method of a blow molded product having a built-in component, wherein the built-in component is attached to the inside of the blow molded product with the parison sandwiched therebetween. 2. The built-in device according to claim 1, wherein when a part of the parison is caused to flow from the mounting hole of the built-in component into a space formed by retracting the middle frame component holding portion slide core, air is sucked from the space by a vacuum pump. Blow molding method of blow molded product having parts. The blow molding method of a blow molded product having a built-in component according to claim 1 or 2, wherein a plurality of the middle frame component holding portions for attaching the built-in component to the blow molded middle frame are provided. When the parison is brought into contact with the blow molding split mold cavity formed by being divided into two at the parting line, an air vent hole is provided in the blow mold split mold cavity, The blow molding method of a blow molded product having a built-in component according to any one of claims 1 to 3, wherein the parison is brought into close contact with the blow molding split mold cavity by sucking air. The inner frame component holding part slide core is slid in the direction of the parison, the inflowed parison is pressed against the inner surface around the mounting hole of the built-in component, and both sides of the mounting hole of the built-in component are 2 and sandwiching the built-in component inside the blow molded product, taking out the middle frame of the blow molding from between the blow molding split molds, closing the blow molding split mold and performing blow molding. The blow molding method of the blow molded product which has a built-in component as described in any one of thru | or 4.