JPH08309839A - Blow molding equipment - Google Patents

Abstract

(57) [Summary] [Purpose] Even when molding a molded article having a complicated shape, the parison is preformed into a shape sufficiently corresponding to the complicated shape, and a molded article having a more uniform thickness is blow-molded. A bag having a main bag portion and a small bag portion, which are made of a material having a thermal conductivity at least smaller than that of the cavity mold 2 and can be expanded or contracted by inflow or outflow of air, between the two cavity molds 2. Form 6 is provided. The parison 3 is extruded around the bag-shaped body 6, and air is supplied to the main bag portion and the small bag portion of the bag-shaped body 6 to expand the bag. Then, decompress the inside of the parison 3 (between the parison 3 and the bag-shaped body 6),
The preform is completed by placing the parison 3 along the outer surface shape of the bag-shaped body 6. After that, the cavity molds 2 and 2 are clamped and blown up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow molding device for blow molding a resin molded product.

[0002]

2. Description of the Related Art Conventionally, a blow molding apparatus as shown in FIG. 9 has been used for blow molding a resin molded article such as a resin container. In this blow molding device, two cavity molds 91, 91, each having a recess corresponding to the outer surface shape of the molded product and capable of clamping or opening the molds close to or apart from each other, are arranged at opposing positions. The mold clamping means (not shown) reciprocates between the mold clamping state in which the two cavity molds 91, 91 are in pressure contact with each other and the condition in which they are separated from each other. These two cavity molds 91, 9
A die head 93 that pushes out the parison 92 is provided between the two cavity molds 91, 91 at the upper part of 1, and air is directed to the parison 9 so as to face the die head 93.
An air supply pipe 94 for supplying the air to the inside of The air supply pipe 94 is connected to the two cavity molds 9
It is configured to reciprocate up and down to a position between 1 and 91.

In order to blow-mold a resin-molded product with the blow-molding apparatus having such a structure, first, the die head 9 with the two cavity molds 91, 91 separated from each other.
Push the parison 92 out of 3. The air supply pipe 94 is raised in parallel with the pushing out of the parison 92, and the air supply pipe 94 is inserted into the lower end of the parison 92. Parison 92
When is pushed to a predetermined position, the pushing out of the parison 92 is stopped, and the two cavity molds 91, 91 are brought close to each other to perform mold clamping. At this time, the inside of the parison 92 is in a sealed state except for the air passage of the air supply pipe 94,
Air is injected into the parison 92 from the air supply pipe 94 to expand the parison 92. The parison 92 is pressed into a concave portion of the cavity mold 91 corresponding to the outer surface shape of the molded product to be molded into a predetermined shape, and the cavity mold 9
It is rapidly cooled by 1 and hardens. After that, the two cavity molds 91, 91 are separated from each other and the air supply pipe 9
4 is lowered and taken out from the parison 92, and unnecessary parts of the molded product are removed to obtain a completed molded product.

However, in this blow molding, the parison 92 and the cavity mold 91 partially contact with each other in the mold clamping process of the two cavity molds 91, 91. Therefore, since the contact portion of the parison 92 is cooled by the cavity mold 91 before the air is injected into the parison 92, it becomes thicker than the non-contact portion, and a molded product having a uniform thickness can be obtained. There was a problem of not having.

Therefore, in JP-A-64-69325, as shown in FIG. 10, a balloon 95 can be attached to the tip of the air supply pipe 94 to form a blow-molded product having a uniform thickness. A blow molding machine is disclosed. In this device, similarly to the above, the parison 92 is pushed out and the air supply pipe 94 is raised, and the air supply pipe 94 and the balloon 95 are inserted into the lower end of the parison 92. In addition, balloon 95
Are pre-processed to form the outer surface shape of the molded product when air is injected and expanded. When the parison 92 is pushed out to a predetermined position, the pushing out of the parison 92 is stopped and the vicinity of the lower end of the parison 92 and the air supply pipe 94 are sandwiched by the two plate members 96, 96. Then, air is injected into the balloon 95 from the air supply pipe 94 to inflate the balloon 95 while contacting the inner surface of the parison 92. In this way, since the parison 92 is preformed into the outer surface shape of the molded product through the balloon 95 having a smaller thermal conductivity than the cavity die 91, the parison 92 can be uniformly molded without being rapidly cooled. Then two cavity molds 9
The molds 1 and 91 are brought close to each other, and the preformed parison 92 is rapidly cooled and hardened by the cavity mold 91.

[0006]

However, the balloon 95 described above is used.
Even with blow molding, which preforms the parison through the molding process, it is difficult to obtain a molded product with a uniform thickness when molding a molded product with a complicated shape in which the shape changes locally There is a point. That is, it is difficult to preprocess the balloon 95 so that the outer surface shape of the balloon 95 when air is inflated and inflated becomes complicated, and in the case of a complicated shape, the balloon 95 is preformed by expansion. Since air is easily trapped between the formed parison 92 and the balloon 95, it is not possible to preform the parison 92 into a shape that sufficiently corresponds to the outer surface shape of the molded article having a complicated shape, and it corresponds to the shape of the molded article. The part that is not done becomes uneven thickness.

The present invention has been made in view of the above circumstances, and even when molding a molded product having a complicated shape in which the shape change is locally large, the parison is made to have a shape sufficiently corresponding to the complicated shape. It is a technical problem to be solved to provide a blow molding device which can be preformed and therefore can form a molded product having a more uniform thickness.

[0008]

[Means for Solving the Problems]

(1) The blow molding device according to claim 1 for solving the above-mentioned problems, each having a recess corresponding to the outer surface shape of a molded product, and a plurality of cavity molds which can be close or separated from each other and can be clamped or opened. A bag having a main bag portion and a small bag portion which are disposed between the mold and the plurality of cavity molds and which are made of a material having at least a thermal conductivity smaller than that of the cavity molds and which can be expanded or contracted by the inflow or outflow of air. A body, an air supply means connected to the main bag portion and the small bag portion of the bag-like body, capable of supplying air to the main bag portion and the small bag portion, and an injection means for injecting a parison around the bag-shaped body. It is characterized by having. (2) The blow molding device according to claim 2 for solving the above-mentioned problems, each having a recess corresponding to the outer surface shape of the molded product, and a plurality of cavity molds that can be clamped or opened by approaching or separating from each other. A mold, and a bag-shaped body that is disposed between the plurality of cavity molds, is made of a material having at least a smaller thermal conductivity than the cavity mold, and has a bag portion that can be expanded or contracted by inflow or outflow of air. An air supply means connected to the bag part of the bag-like body and capable of supplying air to the bag part, an injection means for injecting a parison around the bag-like body, and a parison injected around the bag-like body. And a bag-shaped body, and a decompression means capable of decompressing the inside of the parison is provided. (3) The blow molding apparatus according to claim 3 for solving the above-mentioned problems, each having a concave portion corresponding to the outer surface shape of a molded product, and a plurality of cavity molds which can be close to or apart from each other and can be clamped or opened. A bag having a main bag portion and a small bag portion which are disposed between the mold and the plurality of cavity molds and which are made of a material having at least a thermal conductivity smaller than that of the cavity molds and which can be expanded or contracted by the inflow or outflow of air. A body, an air supply means connected to the main bag portion and the small bag portion of the bag-like body, capable of supplying air to the main bag portion and the small bag portion, and an injection means for injecting a parison around the bag-shaped body. And a decompression unit that is connected between the parison injected around the bag and the bag and that can decompress the inside of the parison.

[0009]

[Action]

(1) In the blow molding apparatus according to claim 1, the bag-shaped body in which the main bag portion and the small bag portion are contracted is arranged between a plurality of cavity molds that are opened, and the bag-shaped body is ejected from the injection means. Eject a parison around the body. Then, air is injected from the air supply means into the main bag portion and the small bag portion of the bag-like body to expand the main bag portion and the small bag portion, and the parison is preformed through the expansion of the main bag portion and the small bag portion. . At the time of preforming the parison, the bag-shaped body is made of a material having a smaller thermal conductivity than that of the cavity mold, so that the parison is not rapidly cooled as in the case of contacting the cavity mold and has a more uniform thickness. The parison can be preformed with. Also,
In the blow molding apparatus according to claim 1, since the bag-shaped body for preforming the parison has the main bag portion and the small bag portion, it becomes easy to adapt the outer surface shape of the bag-shaped body to a complicated shape. Therefore, the parison can also be preformed into a shape sufficiently corresponding to a complicated shape. (2) In the blow molding apparatus according to claim 2, in a state where the bag-shaped body in which the bag portion is contracted is disposed between a plurality of mold cavities that have been opened, the injection means surrounds the bag-shaped body. Eject the parison. Then, air is injected from the air supply means into the bag portion of the bag-shaped body to expand the bag portion, and the parison is preformed through the expansion of the bag portion. At the time of preforming the parison, the bag-like body is made of a material having at least a smaller thermal conductivity than the cavity mold, so that the parison is not rapidly cooled as in the case of contacting the cavity mold and has a more uniform thickness. The parison can be preformed. In the blow molding according to the second aspect, thereafter, the inside of the parison is depressurized by the depressurizing means connected between the parison injected around the bag and the bag. Thereby, even if the outer surface shape of the bag-shaped body is a complicated shape, between the parison and the bag-shaped body in the part where the preformed parison cannot follow the expansion of the bag portion of the bag-shaped body. Since it is possible to eliminate the formed air pocket, it becomes possible to preform the parison into a shape that almost completely matches the outer surface shape of the bag-shaped body. (3) In the blow molding device according to claim 3, the bag-shaped body for preforming the parison has a main bag portion and a small bag portion, and the parison and the bag injected around the bag-shaped body. Since it has a pressure reducing means capable of reducing the pressure between the blow molding device and the body, it has both the functions of the blow molding device according to claim 1 and the blow molding device according to claim 2.

[0010]

The present invention will be described below in detail with reference to examples. The blow molding apparatus of the present embodiment, as shown in FIG.
A locally molded projecting portion 1a is provided on the upper surface, and a hollow molded resin molded product 1 having a uniform thickness is molded.

As shown in FIG. 1, this blow molding apparatus has two cavity molds 2 and 2 each having recesses 2a and 2b corresponding to the outer surface shape of a molded product 1 arranged at opposing positions, and a mold not shown. By the clamping means, the two cavity molds 2 and 2 reciprocate between a mold clamped state in which they are pressed close to each other and a mold open state in which they are separated from each other. A die head 4 as an injection unit for pushing out the parison 3 is provided between the two cavity molds 2 and 2 above the two cavity molds 2 and 2.
A nozzle 5 having both an air supply means and a pressure reducing means is connected to the lower end surface of the die head 4.

As shown in a sectional view of FIG. 2 and a top view of FIG. 3, the nozzle 5 has a main pipe line portion 51 for supplying air to a main bag portion 61 of a bag-shaped body 6 which will be described later, and a later-described nozzle. The first to third small bag portions 62a to 62c of the bag-shaped body 6 have first to third small pipe passage portions 52a to 52c for supplying air, respectively, and a pressure reducing pipe portion 53. Main pipeline section 51, and first to
The third small conduit portions 52a to 52c are independently connected to an air supply device (not shown). It should be noted that this air supply device has both functions of supplying and sucking air, and has high-temperature air (about 50 to 120 ° C.) and low-temperature air (1
50 to 0 ° C.). In addition, the decompression pipeline 53 is connected to a decompression device (not shown),
As shown in FIG. 2, the tip position of the decompression pipe portion 53 is retracted from the tip position of the nozzle 5, and the tip of the decompression pipe line portion 53 is formed by pushing the parison 3 and the bag body 6 around the bag body 6 described later. It is designed to open in between. This decompression device also has both the function of supplying air and the function of sucking air.

The tip of the nozzle 5 is made of silicon rubber so as to be arranged between the two cavity molds 2 and 2, and has a main bag portion 61 and a main bag portion 61 which can be expanded or contracted by inflow or outflow of air. The bag-shaped body 6 having the first to third small bag portions 62a to 62c is mounted. The bag-shaped body 6 is a main bag portion 6
Air is supplied to all of the first and first to third pouch parts 62a to 62c, and all the main pouch parts 61 and the first to third pouch parts 62 are supplied.
As shown schematically in FIGS. 4 and 5, when the a to 62c are inflated, the outer shape of the inflated state is configured so as to substantially correspond to the shape of the molded product 1.
All main bag portions 61 and first to third small bag portions 62a to 62c
When the shapes of the main bag portion 61 and the first to third small bag portions 62a to 62c are described below in the inflated state, B of FIG.
The main bag part 61 and the 1st-3rd small bag part 6 in the -B line cross section
2a to 62c, as shown in FIG.
The main bag portion 61 has a horizontally long hexagonal shape, and four first pouch portions 61 a and two second pouch portions 62 are provided around the main bag portion 61.
b and four third pouch portions 62c are arranged together with the main pouch portion 61 so as to form a rectangular parallelepiped as a whole. The main bag portion 61, the four first pouch portions 61a, and the four third pouch portions 62c have the same sectional shape and extend in the longitudinal direction. The two second pouch portions 62b basically have the same cross-sectional shape and extend in the longitudinal direction, but the main pouch portion 61 and the first to third pouch portions 62a to 62c in the cross section taken along the line AA of FIG. As shown in the schematic cross-sectional shape of FIG.
Only the portion corresponding to the protrusion 1a has a bulged shape corresponding to the shape of the protrusion 1a. In addition, the tip corners of the bulging portions of the two second pouch portions 62b are notched step portions 6
It is said to be 21.

The main bag portion 61 of the bag-shaped body 6 is the nozzle 5
Connected to the main duct portion 51 of the bag-like body 6, all four first pouch portions 62a of the bag-like body 6 are connected to the first small duct portion 52a of the nozzle 5 by a tube not shown, and the two second pouches of the pouch-like body 6 are connected. The parts 62b are both connected to the second small conduit part 52b of the nozzle 5 by a tube not shown, and the four third small bag parts 62c of the bag-shaped body 6 are all connected to the third small conduit part 52c of the nozzle 5 by a tube not shown. Has been done. Further, the main bag portion 61 of the bag-shaped body 6 and the first to third small bag portions 62a to 62.
A string (not shown) is fixed to the inner surface of the tip portion of c, and each string can be wound by a winding device (not shown).

Also. Two pinch plates 7, 7 for pre-pinching the vicinity of the lower end of the parison 3 are arranged below the two cavity molds 2, 2. The molding method using the blow molding apparatus of this embodiment will be described below. First, the bag-shaped body is arranged so that the bag-shaped body 6 in which the main bag portion 61 and the first to third small bag portions 62a to 62c are contracted is arranged between the two cavity molds 2 and 2 that are opened. 6 is arranged at the tip of the nozzle 5 (see FIG. 1A). In this state,
The parison 3 is ejected from the die head 4 around the bag-shaped body 6. Then, high temperature air is supplied to the main pipe line 51 and the first small pipe line 52a of the nozzle 5 from an air supply device (not shown) to inflate the main bag part 61 of the bag-shaped body 6 and the four first small bag parts 62a (FIG. 1). (B) and FIG. 7 (a)). Accordingly, the parison 3 ejected from the die head 4 can be supported by the four first pouch portions 62a, and the drawdown of the parison 3 can be prevented. Next, high temperature air is supplied to the second small pipe line 52b of the nozzle 5 from an air supply device (not shown) to inflate the two second small bag portions 62b of the bag-shaped body 6 (see FIG. 7B). Then, the two pinch plates 7, 7 arranged below the two cavity molds 2, 2 are brought close to each other to sandwich the vicinity of the lower end portion of the parison 3 and the nozzle 5 from an air supply device (not shown). Hot air is supplied to the third small pipe line 52c to inflate the four third small bag portions 62c of the bag-shaped body 6 (see FIGS. 1C and 7C). Then, a decompression device (not shown) is operated to reduce the pressure inside the parison 3 (between the bag-shaped body 6 and the parison 3), and the parison 3 is preformed along the outer peripheral surface of the bag-shaped body 6. Completed (see FIG. 1 (d)).

After the preforming of the parison 3 is completed, the mold clamping means (not shown) is operated to bring the two cavity molds 2 and 2 into close proximity to each other and clamp the mold, so that the parison 3 is recessed 2a of the two cavity molds. 2b to contact and quench
Let it cure. Simultaneously with this mold clamping, the main pipe line 51 and the first to third small pipe lines 5 of the nozzle 5 are supplied from an air supply device (not shown).
The main bag portion 61 of the bag-shaped body 6 by supplying low temperature air to 2 to 52c.
By increasing the pressure inside and all of the first to third pouch portions 62a to 62c, and utilizing the uniform extension behavior of the bag-shaped body 6 made of silicon rubber, the parison 3 is recessed into two cavity molds 2a, Press 2b.

After the cooling and curing of the parison 3 is completed, air is supplied into the decompression pipe line 53 of the nozzle 5 from a decompression device (not shown) to blow air between the parison 3 and the bag-like body 6, and at the same time as shown in the drawing. The main bag portion 61 of the bag-shaped body 6 and the first to third small bag portions 62a to 6 through the main pipe line 51 of the nozzle 5 and the first to third small pipe lines 52a to 52c by the air supply device.
While sucking the air in 2c, the main bag portion 61 of the bag-shaped body 6 and the respective strings fixed to the inner surfaces of the tip end portions of the first to third small bag portions 62a to 62c are wound by a winding device (not shown), Main bag portion 61 and first to third small bag portions 62a-
62c is pulled off from the inner surface of the parison 3 to form a bag-shaped body 6
Can be easily removed from the parison 3.

Finally, the two cavity molds 2, 2 are separated from each other and opened, and the unnecessary resin on the outside of the cavity mold 2 is removed to complete the blow molding of the parison 3. In the blow molding apparatus of this embodiment, the bag-shaped body 6 has the main bag portion 6 and the first to third small bag portions 62a to 62c,
The main bag portion 6 and the first to third small bag portions 62a to 62c.
Since each of them can supply air independently, when the parison is preformed, the main bag portion 61 of the bag-shaped body 6,
And the 1st-3rd pouch parts 62a-62c can be expanded one by one. In this way, by sequentially inflating the main bag portion and the small bag portion, the parison can be stretched from the whole without being locally stretched, so that the parison 3 can be preformed with a uniform thickness. Be advantageous. Further, since the bag-shaped body 6 is supplied with silicon rubber whose thermal conductivity is extremely smaller than that of the cavity mold 2, and high-temperature air is supplied into the bag-shaped body 6, the parison 3 is preformed when the parison 3 is preformed. The parison 3 can be preformed with a more uniform thickness without being rapidly cooled unlike when it comes into contact with the mold 2. Further, the bag-shaped body 6 for preforming the parison 3 is provided with the main bag portion 6 and the first to third small bag portions 62.
Since it has a to 62c, it becomes easy to adapt the outer surface shape of the bag-shaped body 6 to a complicated shape, and therefore the parison 3 can be preformed to a shape sufficiently corresponding to the complicated shape. .

Further, in the blow molding apparatus of this embodiment,
Since the inside of the parison 3 (between the parison 3 and the bag-shaped body 6) can be depressurized via the depressurizing pipe line 53 of the nozzle 5,
Even if the outer shape of the bag-shaped body 6 is complicated, the parison 3
In the part where the bag-shaped body 6 could not follow the expansion,
Since the air pocket formed between the parison 3 and the bag-shaped body 6 can be eliminated, the parison 3 can be preformed into a shape that almost completely matches the outer surface shape of the bag-shaped body 6.

As described above, in the blow molding apparatus of this embodiment, even when molding a complicated shape, there is no air trap between the parison 3 and the bag-like body 6, and the parison 3 is sufficiently shaped to have the complicated shape. Since it can be preformed into a corresponding shape, when the two cavity molds 2 and 2 are clamped, the entire outer surface of the parison 3 is simultaneously covered with the entire inner surfaces of the recesses 2a and 2b of the cavity molds 2 and 2. In addition to being able to make contact, the entire outer surface of the parison 3 can be pressed uniformly against the cavity mold 2 even during blow-up after mold clamping. Therefore, according to the blow molding apparatus of the present embodiment, it is possible to blow mold a molded product having an extremely uniform thickness, even if the molded product has a complicated shape.

Further, since the parison 3 can be preformed into a shape substantially conforming to the shape of the molded product, the unnecessary resin portion after blow molding can be extremely reduced, which is also advantageous in terms of material yield. Furthermore, since the bag-shaped body 6 has the main bag portion 61 and the first to third small bag portions 62a to 62c and is divided into a plurality of rooms, the heat capacity in each room is small, and the hot air at the time of preforming is Since the heat exchange between the supply and the supply of the low temperature air at the time of blow-up after the mold clamping becomes easy, there is an advantage in shortening the cycle time.

In the above embodiment, the bag-shaped body 6 is made of silicone rubber, which is advantageous in terms of heat resistance, strength, stretchability, non-adhesiveness with molten resin, etc., but is not limited to this. Alternatively, natural rubber, fluorine rubber, or the like may be used. Further, in the above embodiment, the string is attached to the bag-shaped body, and the example in which the bag-shaped body in the parison is extracted after blow-up molding has been described, but the bag-shaped body is left in the parison and the parison and the bag-shaped body are left. It is also possible to integrally mold.

Furthermore, in the above embodiment, an example in which the bag-shaped body having the main bag portion and the small bag portion is used and the depressurizing means capable of depressurizing between the bag-shaped body and the parison is used, is described. When used alone,
It is possible to achieve the effect of making the wall thickness of a molded product uniform when molding a molded product having a complicated shape.

[0024]

As described above in detail, in the blow molding apparatus of the present invention, even when molding a molded article having a complicated shape, the parison can be preformed into a shape sufficiently corresponding to the complicated shape. Therefore, when the cavity mold is clamped, the entire inner surface of the recess of the cavity mold can be brought into contact with the entire outer surface of the parison at the same time, and the entire outer surface of the parison can be made uniform even during blow-up after the mold is clamped. It can be pressed into the cavity mold. Therefore, according to the blow molding apparatus of the present embodiment,
Even if the molded product has a complicated shape, it is possible to blow mold a molded product having an extremely uniform thickness.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically illustrating each step of a blow molding method according to an embodiment, (a) is a state before extrusion of a parison, and (b) is a main bag portion of a bag-shaped body in which a parison is extruded. And a state in which the first pouch portion is inflated, (c) is a state in which the second pouch portion and the third pouch portion of the bag-shaped body are further inflated,
(D) shows a state where the space between the parison and the bag-like body is decompressed by the decompression means, and (e) shows a state after mold clamping.

FIG. 2 is a cross-sectional view of a nozzle according to the blow molding apparatus of the embodiment.

FIG. 3 is a top view of a nozzle according to the blow molding apparatus of the embodiment.

FIG. 4 is a diagram illustrating an outer surface shape of a bag-shaped body according to an embodiment of the present invention in a completely expanded state.

5 is a diagram illustrating the outer surface shape of the bag-shaped body in a cross section taken along the line AA in FIG.

FIG. 6 is a diagram illustrating the shapes of the main bag portion and the first to third small bag portions of the bag-shaped body taken along the line BB of FIG.

FIG. 7 is a diagram illustrating the shapes of the main bag portion and the first to third small bag portions of the bag-shaped body in the cross section taken along the line AA of FIG.
(A) is a state where the main bag part and the first pouch part are inflated, (b)
Shows a state in which the second pouch portion is further inflated, and (c) shows a state in which the third pouch portion is further inflated.

FIG. 8 is a perspective view of a blow-molded product molded by the blow-molding apparatus of this embodiment.

FIG. 9 is a cross-sectional view schematically illustrating a conventional blow molding device.

FIG. 10 is a cross-sectional view schematically illustrating another conventional blow molding device.

[Explanation of symbols]

1 is a molded product, 2 is a cavity mold, 2a and 2b are concave parts, 3
Is a parison, 4 is a die head, 5 is a nozzle, 51 is a main conduit, 52a to 52c are first to third small conduits, 53 is a decompression conduit, 6 is a bag-like body, 61 is a main bag part, and 62a to 62c are First
~ The third pouch portion, 7 is a pinch plate.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yukio Obo Nobunta, Tauraminato-cho, Yokosuka City, Kanagawa Kanto Automobile Industry Co., Ltd. Within the corporation

Claims (3)

[Claims] 1. A plurality of cavity molds, each of which has a recess corresponding to the outer surface shape of a molded product and which can be clamped or opened by being close to or apart from each other, and arranged between the plurality of cavity molds. Made of a material having at least a smaller thermal conductivity than the cavity mold,
A bag-shaped body having a main bag portion and a small bag portion that can be inflated or contracted by inflow or outflow of air, and connected to the main bag portion and the small bag portion of the bag-shaped body, and can supply air to the main bag portion and the small bag portion. A blow molding apparatus, comprising: a flexible air supply means; and an injection means for injecting a parison around the bag-shaped body. 2. A plurality of cavity molds, each of which has a recess corresponding to the outer surface shape of a molded product, and which can be clamped or opened to be close to or apart from each other, and arranged between the plurality of cavity molds. Made of a material having at least a smaller thermal conductivity than the cavity mold,
A bag-shaped body having a bag portion that can be inflated or deflated by inflow or outflow of air, an air supply unit that is connected to the bag portion of the bag-shaped body and can supply air to the bag portion, and the periphery of the bag-shaped body. And a decompression means capable of decompressing the inside of the parison, which is connected between the parison injected around the bag and the bag. Molding equipment. 3. A plurality of cavity molds, each of which has a recess corresponding to the outer surface shape of a molded product, and which can be clamped or opened to be close to or apart from each other, and arranged between the plurality of cavity molds. Made of a material having at least a smaller thermal conductivity than the cavity mold,
A bag-shaped body having a main bag portion and a small bag portion that can be inflated or contracted by inflow or outflow of air, and connected to the main bag portion and the small bag portion of the bag-shaped body, and can supply air to the main bag portion and the small bag portion. The air supply means, the injection means for injecting the parison around the bag-like body, and the parison injected around the bag-like body and the bag-like body are connected to each other so that the pressure inside the parison can be reduced. A blow molding device comprising: a decompression means.