JPH04152123A - Blow-molded product having fitting part and its manufacture - Google Patents

Abstract

PURPOSE:To manufacture a duct provided with a flange by only blow molding, by a method whrein the title product possesses a fitting part comprised of the first resin substance provided with a fitting surface into which a through hole is formed and a blow-molded hollow part comprised of the second resin substance inserted into the through hole and integrated with the fitting part. CONSTITUTION:An undercut forming part 2c is formed within a through hole of fitting parts 2 and the fitting parts 2 are fitted to the inside of grooves formed into a pair of molds 5a, 5b. A gap 6 is set up between the pair of the molds 5a, 5b. Parison 7 is introduced into the gap 6 between the pair of the molds 5a, 5b and inserted into through hole 2a of the fitting part 2. The pair of the molds 5a, 5b are clamped, compressed air is sucked into the parison and blow molding is performed. The parison is blow-molded into a predetermined form decided by a form of a cavity of the pair of the molds 5a, 5b and a blow-molded hollow part 7' is formed. An undercut coating part 7'c is formed after a form of the undercut forming part 2c in the blow-molded hollow part 7' and integrated with the fitting part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a blow molded product having a mounting portion such as a flange, and a method for manufacturing the same.

BACKGROUND OF THE INVENTION At the connection between ducts or between a duct and a body such as an engine, it is sometimes necessary to provide a mounting part such as a flange at one end of the duct. Such flanges are required to securely connect ducts to each other or to connect ducts to the main body, and are required to ensure that there is no fluid leakage from the connection points. , such attachment parts are required to have properties such as relatively high mechanical strength and heat resistance.

Conventionally, in the case of a duct having a mounting portion such as a flange, at least the flange is generally formed from metal by machining or casting. However, when the flange is manufactured from metal, it is necessary to connect the flange to the duct, which increases the number of manufactured parts and complicates the manufacturing process. Furthermore, if the duct is manufactured from a resin product in order to connect the duct to a metal flange, it is necessary to perform special processing on at least the end of the duct to ensure a tight seal between the flange and the duct. Become.

For example, when installing a duct in a relatively narrow space such as the engine room of a car, it is important that the duct can take any two-dimensional or three-dimensional shape; From this point of view, it is desirable that the duct itself be manufactured from resin by blow molding.

On the other hand, when it is necessary to provide a flange at at least one end of such a duct, it is desirable to form such a flange from a resin product, but the flange itself has mechanical strength, heat resistance, etc. Due to the unique characteristics required, it is difficult to manufacture such flanged ducts solely by blow molding the duct.

Conventionally, when manufacturing ducts by blow molding, insert parts with a predetermined shape are placed in a mold in advance, and blow molding is performed after the molds are matched, so that these insert parts can be made into blow molded products. It is being integrally molded. However, in such cases, the parison used to form the duct by blow molding is a cylindrical resin that is in a high temperature molten state.
These insert parts are limited to those having a rod-like shape or an arc-like shape.

Purpose The present invention has been made in view of the above points, and solves the drawbacks of the prior art as described above, and provides a blow molding device having a mounting portion such as a flange integrally formed on a blow molding duct. The purpose is to provide products and manufacturing methods thereof.

According to the present invention, there is provided a blow molded product in which a mounting portion such as a flange is integrally formed with a blow molded duct. The mounting portion has at least one through hole formed therein, has a mounting surface, and is formed from a first resin material. A blow-molded hollow part is inserted into the through hole of the attachment part, and the blow-molded hollow part is integrated with the attachment part by blow molding. In a preferred embodiment, a protrusion for forming an undercut is integrally formed with the mounting part, protruding inward from the side wall of the through-hole of the mounting part.

Such attachment portions typically constitute flanges and are preferably formed from a first resin material, such as by injection molding or compression molding. Meanwhile, the blow molded hollow portion is formed from the second resin material by blow molding. In this way, since the mounting part and the blow-molded hollow part are each made of the first and second resin materials, it is possible to select the resin material that matches the required characteristics of each, and each of the blow-molded products can be made of different resin materials. It is possible to construct a product that satisfies various conditions such as mechanical strength and heat resistance required for its constituent parts. Furthermore, since the mounting portion and the blow-molded hollow portion are each formed from a resin material,
When blow molding the blow molded hollow part, it is possible to firmly integrate the blow molded hollow part and the attachment part.

According to the manufacturing method of the present invention, a mounting portion in which at least one through hole is formed is prepared, a parison made of a resin in a high temperature molten state is inserted into the through hole of the mounting portion, and the parison is inserted into the through hole. In the inserted state, the parison is blow-molded into a predetermined shape, and the blow-molded hollow part formed from the parison is integrated with the attachment part by the blow-molding. As described above, according to the method of the present invention, the parison is inserted into the through hole of the mounting part and blow molding is performed, so the connection between the hollow molded part and the mounting part is extremely strong and reliable. It has a high sealability and a reliable seal, and no fluid leaks from the connection. Also, since the hollow part itself is formed by blow molding,
The hollow part can be formed into any one-dimensional, two-dimensional or three-dimensional shape; - The blade attachment part is manufactured in a separate process before blow molding the hollow part, so there are no demands on the attachment part itself. It is possible to manufacture the material, shape, and size to fully satisfy various conditions such as mechanical strength and heat resistance.

EXAMPLES Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a blow molded article 1 constructed according to one embodiment of the invention. This blow molded product 1 has a mounting part 2 and a hollow part 3, and the mounting part 2 is molded by, for example, injection molding or compression molding.
On the other hand, the hollow portion 3 is formed into any desired shape by blow molding.

FIG. 2 shows an example of the attachment part 2 that can be used for the blow-molded product 1 of the present invention described above. In the embodiment shown in FIG. 2, the mounting portion 2 has a generally rectangular plate shape, and the upper and lower surfaces are parallel and flat, and at least one of the upper and lower surfaces forms the mounting surface. ing. The mounting portion 2 has three through holes 2a, and a total of six mounting holes 2b for inserting bolts and the like at the ends thereof. On the other hand, FIG. 3 shows another embodiment of the attachment part 2 that can be used in the blow-molded product 1 of the present invention. In the embodiment shown in FIG. 3, the mounting portion 2 is simply provided with one through hole 2a.
Further, a mounting hole 2b is provided for inserting a pair of bolts or the like.

Also in this mounting portion 2, at least one of the upper surface and the lower surface thereof is formed as a mounting surface.

4 to 7 show the structure of the mounting portion 2 shown in FIG. 2 in more detail. As is clear from FIGS. 4, 6, and 7, in this embodiment, an undercut forming portion 2c is formed to protrude inward from the side wall of the through hole 2a. The undercut forming portion 2c has a ring shape as a whole, and its cross-sectional shape is approximately an inverted trapezoid. If desired, such an undercut forming portion can also be provided in the mounting portion 2 shown in FIG. 3.

Next, one embodiment of the method for manufacturing the blow molded product 1 shown in FIG. 1 will be described with reference to FIGS. 8 to 11. First, the mounting portion 2 is molded into a desired shape from a desired resin material. In this case, it is typically possible to mold the attachment part 2 by injection molding or compression molding, but it is also possible to mold it by blow molding if desired.

The mounting part 2 is for mounting the completed blow-molded product 1 to another duct or main body, so at least a part thereof has a mounting surface formed therein, and is fastened with bolts or the like. relatively high mechanical strength is often required. Furthermore, when the attachment part is attached to, for example, an engine body, it is heated to a considerably high temperature, and therefore heat resistance properties may be required. Therefore, it is possible to select any resin material that satisfies various conditions such as required mechanical strength and heat resistance characteristics, depending on the situation where the mounting portion 2 is applied. for example,
When heat resistance properties are required, PA6, PA66 can be used as the resin material for molding the attachment part 2, or it is also possible to use a resin mixed with a filler.

If LLC resistance is required, it is also possible to use, for example, PA66 glass fiber-containing resin or PPS. Further, in order to provide sufficient mechanical strength to the mounting portion 2, the dimensions and shape of the mounting portion 2, such as the thickness, can be set arbitrarily.

At least one through hole 2a is formed in this attachment part 2 so as to integrate it with the hollow part 3.

As shown in FIG. 8, an undercut forming portion 2 is provided in the through hole 2a of the mounting portion 2, protruding inward from the side wall thereof.
C is formed.

As shown in FIG. 8, the mounting portion 2 previously formed in this manner is mounted in the grooves formed in the pair of molds 5a and 5b. A gap 6 is set between the pair of molds 5a and 5b.

Next, as shown in FIG. 9, a pair of molds 5a are formed.

The parison 7 is introduced into the gap 6 between the parts 5b and inserted into the through hole 2a of the attachment part 2. Next, as shown in FIG. 10, the pair of molds 5a and 5b are clamped and compressed air is blown into the parison to perform blow molding. As a result, the parison is blow-molded into a predetermined shape determined by the shapes of the cavities of the pair of molds 5a and 5b, forming a blow-molded hollow portion 7'. In this case, a part of the cavity defined by the pair of molds 5a and 5b is defined by the through hole 2a of the mounting portion 2, and the undercut forming portion 2C is formed in the through hole 2a. , the blow molded hollow part 7' is formed into an undercut covering part 7' following the shape of this undercut forming part 2C.
c is formed. The blow-molded hollow part 7' is therefore integrated with the mounting part 2.

Next, as shown in FIG. 11, it is required that the lower surface of the mounting part 2 is formed as a mounting surface, and that the end of the blow-molded hollow part 7' is flush with the mounting surface of the mounting part 2. If so, the hollow portion 7' shown at 77a in FIG. 11 is removed. In this embodiment, since the undercut forming part 2C is provided which is integral with the mounting part 2, the mounting part 2 and the hollow part 7' (3) are not only integrated by welding, but also have an undercut. They are also mechanically integrated via the forming portion 2C and its covering portion 7'C. In addition, in the above-mentioned embodiment, the undercut forming portion 2C having an inverted trapezoidal cross section is used.
Such mechanically integrated portions do not necessarily need to be formed by undercut formations. Depending on the degree of mechanical integration required, it is also possible to use a protrusion-like configuration without forming an undercut, and it is also possible to use a protrusion-like configuration without necessarily forming an undercut. It is also possible to form a groove in the side wall of 2a and fill the groove with a portion of the hollow portion 7'. Moreover, the hollow part 7' can be blow molded into any one-dimensional, two-dimensional, or three-dimensional shape, and therefore has various mechanical properties, heat resistance properties, etc. required for the hollow part 7'. It is possible to mold it from a desired resin material in view of its characteristics.

Next, FIGS. 12 to 19 show blow-molded products in which a pair of mounting portions acting as flanges are formed at both ends and a plurality of hollow portions are provided between the pair of mounting portions.
This will be explained with reference to the figures.

FIG. 18 shows a blow molded article 1 in this embodiment of the invention, i.e. it has a pair of fittings 2, 2 and between these pairs of fittings 2, 2 there are four The duct 3 is integrally connected and formed. Both ends of each hollow part 3 are integrally connected to a pair of mounting parts 2.2, and each of the pair of mounting parts 2.2 has a mounting surface, so that it can be mounted to a main body such as an engine, for example. It is.

Method 1 of manufacturing the blow molded product 1 shown in FIG. 18!
! This will be explained with reference to FIGS. 12 to 17. In addition, FIG. 19 shows a diagram that can be used in this method.
An extruder 14 capable of simultaneously extracting four parisons 7 from a die head 11 is shown. As shown in FIG. 12, the pair of molds 5a and 5b are separated from each other, and a pair of mounting portions 2.2 are set, for example, in a groove 20 formed in one of the molds 5b. As described above, the attachment part 2 is an insert part formed in advance from a desired resin material into a predetermined shape by a suitable molding technique such as injection molding or compression molding.

Note that the molds 5a and 5b are each provided with inserts 8a and 8b that can be moved back and forth, and the inserts 8a and 8b are movable back and forth.
a, 8b are operatively connected to cylinder actuators 9a, 9b. Therefore, the cylinder actuator 9a,
9b moves the position of the inserts 3a, 8b to the forward position or the retracted position.

After setting the mounting part 2 in the mold 5b, these molds 5
As shown in FIG. 13, move the molds 5a and 5b closer to each other as indicated by the arrows B, so that the mounting parts 2 are set in the grooves 20 of both molds 5a and 5b. .

In this state, a cavity 6 having a desired shape is defined between the pair of molds 5a and 5b. By the cylinder actuators 9a, 9b, the inserts 8a, 8b
are in the forward position, and the lower mounting portion 2 is set in a predetermined position by these inserts 8a and 8b. Furthermore, a die head 11 including a parison controller 12 is located above the cavity 6 defined by the pair of molds 5a and 5b. Air bin 13 from die head 11
extends downward. In addition, shutter members 10a and 10b are provided in the cavities 6 in the molds 5a and 5b, respectively.
are arranged at each of the inlet end and the outlet end of the.

In the state shown in FIG. 1113, these shutter members 10a and 10b are separated, so that the entrance and exit portions of the cavity 6 are in an open state.

Next, as shown in FIG. 14, the parison 7 is extracted from the die head 11 and introduced into the cavity 6. The parison 7 thus advances within the cavity 6 and extends through the through-hole of the upper mounting part 2 and the through-hole of the lower mounting part 2 . After the parison 7 has been extracted to a desired length, as shown in FIG.
0b close to each other to keep the upper and lower sides of the parison 7 in a sealed state. In this case, the air bin 13 extends into the parison 7 via the shutter members 10a and 10b. Therefore, the shutter member 10g, 1
After closing 0b, compressed air is blown into the parison 7 through the air bottle 13 to perform blow molding. As a result, the parison 7 within the cavity 6 has a hollow section 7' having the desired shape determined by the shape of the cavity 6.
becomes.

Next, as shown in FIG. 16, the inserts 8a and 8b are first moved to the retracted position by the cylinder actuators 9a and 9b, and then the molds 5a and 5b are separated from each other and the blow-molded hollow part 7' is taken out. . Thereafter, as shown in FIG. 17, unnecessary portions 7/a extending outward from the pair of attachment portions 2.2 of the blow-molded hollow portion 7' are removed, and the present embodiment shown in FIG. A blow molded product 1 is obtained.

Next, FIG. 20 shows a blow-molded product 1 having a blow-molded hollow part 3 having a pair of attachment parts 2.2 of different shapes at both ends. These attachment parts 2.2 are shown in FIGS. 21a and 21b, respectively. Chapter 21a
The mounting portion shown in the figure, ie, the flange 2, has a circular through hole 2a formed in the center thereof, and a pair of mounting holes 2b. On the other hand, the mounting portion 2 shown in FIG. 21b has a rectangular through hole 2a formed in its center and four mounting holes 2b formed in its four corners.

Although not shown in FIGS. 21a and 21b, each through-hole 2a may be provided with a protrusion-shaped or groove-shaped engagement portion as desired, thereby forming a hollow portion 3 to be blow-molded.
It is possible to improve the mechanical bond with. 21st
The attachment portion or flange 2 shown in Figures a and 21b is preferably pre-molded from a desired resin material using a desired molding technique such as injection molding or compression molding or the like.

FIG. 22 shows a pair of upper mold 5a and lower mold 5b used to mold the blow molded product 1 shown in FIG. 20. These molds have grooves of a desired shape carved in their mold matching surfaces, and when the pair of upper and lower molds 5a and 5b are matched, the molds' A cavity having the desired shape is defined therebetween.

First, as shown in FIG. 22, the upper mold 5a is separated from the lower mold 5b to open the lower mold 5b.

Grooves for setting the attachment portions 2 at desired positions on the lower mold 5b are carved, and the attachment portions 2 are set in these grooves. Next, as shown in FIG. 23, the head 11 and the lower mold 5b are moved relatively, and the parison 7 extracted from the head 11 is moved along the grooves carved on the mold matching surface of the lower mold 5b. Let it be inserted.

In this case, the parison 7 is inserted into the through hole 2a of the mounting portion 2. If it is difficult to insert the parison 7 into the through hole 2a of the attachment part 2, for example, the attachment part 2 should be positioned near the exit of the head 11, and the parison 7 can be inserted into the groove of the lower die 5b. It is also possible to set the attachment part 2 at a predetermined position on the lower mold 5b at an appropriate position as the lower mold 5b is sequentially inserted.

In either method, as shown in FIG. 24, the parison 7 extends completely through the through-hole 2a of each mounting portion 2.

Note that the head 11 and the lower mold 5b are positioned in a relatively fixed state, and the parison 7 extracted from the head 11 is guided and inserted into the groove of the lower mold 5b one by one using an appropriate guide member. is also possible.

After inserting the parison 7 into the groove of the lower mold 5b and into the through holes 2a of the respective attachment parts 2, the upper mold 5a is mold-aligned with the lower mold 5b, and the molds are clamped as shown in FIG. Do the following. After the molds are clamped, the parison 7 is housed in the cavity of the pair of clamped molds 5, a and 5b.
The tip of the air pin 13 is inserted into the parison 7, and compressed air is injected into the parison 7 through the air pin 13. This causes the parison 7 to expand and blow mold into the desired shape defined by the cavity. After that, the upper mold 5a is separated from the lower mold 5b, and the blow-molded molded product is transferred to the lower mold 5b.
The unnecessary portion 7'a extending outward from the mounting surface of each mounting portion 2 is cut off. Thereby, the second
A blow molded product 1 shown in FIG. 0 is formed. Also in this case, the mounting part 2 and the hollow part 3 are the through-hole 2 of the mounting part 2.
A is integrated by blow molding. That is, the mounting part 2 and the hollow part 3 are integrated at least by welding at the through-hole 2a of the mounting part 2, and the mounting is facilitated by providing an engaging part such as a protrusion or groove on the side wall of the through-hole 2a as described above. It is possible to improve the integration by mechanically connecting the portion 2 and the hollow portion 3. FIGS. 27 to 30 show some embodiments of the present invention, in which blow molding has a mounting part 2 acting as a flange and a hollow part 3 as a bent pipe formed integrally with the flange 2. Show item 1). In the blow molded product 1 shown in FIG. 27, the lower surface 2d of the mounting portion 2 defines a mounting surface, and is mounted to a main body such as an engine via an O-ring 15, for example. As described above, the mounting portion 2 is molded from a desired resin by an appropriate molding technique such as injection molding or compression molding, and has a through hole 2a. Penetration port 2
An engaging portion 2c is formed in a protruding manner on the side wall of a. This engaging portion 2c is a protrusion for forming an undercut, and has a cross section that is approximately in the shape of an inverted trapezoid. A hollow portion 3 whose lower end portion is inserted into the through hole 2a of the attachment portion 2 to form a bent pipe is provided. The hollow portion 3 is firmly and integrally formed by being welded to the mounting portion 2 by blow molding within the through hole 2a of the mounting portion 2 and engaging with the engaging portion 2c.

28 shows a modification of the blow molded product 1 shown in FIG. 27, which has roughly the same configuration as the blow molded product 1 shown in FIG. A recess is formed around the through hole 2a of the mounting portion 2,
Therefore, a part of the hollow part 3 expands in the radial direction, and the enlarged part 3a
, and fills the recess of the mounting portion 2. It is desirable that the enlarged portion 3a has a size such that, for example, the O-ring 15 comes into contact with it when the attachment portion 2 is attached to the main body 20 such as an engine. With such a configuration, it is possible to improve the airtightness between the mounting portion 2 and the main body 20. In this case, for example, the attachment part 2 is required to have relatively high mechanical strength, but since the enlarged part 3a is made of the resin material of the hollow part 3, it is more flexible than the resin material of the attachment part 2. Therefore, by interposing the enlarged part 3a between the mounting part 2 and the main body 20, it is possible to improve the sealing performance.

FIG. 29 shows yet another modification. The blow-molded product 1 shown in FIG. 29 also has basically the same structure as the blow-molded product 1 shown in FIG. 27, but in the embodiment shown in FIG. On the opposite surface, a cylindrical portion 2e stands up a predetermined length from the periphery of the through hole 2a.
is formed. By providing the cylindrical portion 2e in this manner, the sealing performance between the attachment portion 2 and the hollow portion 3 is improved.

Furthermore, when blow molding the hollow part 3, the cylindrical part 2e is
Since it is welded thereto, it also contributes to improving the mechanical integrity of the mounting portion 2 and the hollow portion 3. FIG. 30 shows an embodiment showing still another modification. The blow molded product 1 shown in FIG. 30 is similar in structure to the blow molded product 1 shown in FIG. 28, but differs in that the mounting portion 2 is made of a composite of a resin material and metal.

That is, in the blow molded product 1 shown in FIG.
has at least one attachment hole, and the attachment portion 2 is fixed and attached to the main body 20 by inserting a bolt or the like through the attachment hole. In this case, the mounting portion 2 is subjected to compressive force by the head of the bolt, and the mounting portion 2 may be deformed. The embodiment shown in FIG. 30 was created in view of the above points, and has a configuration in which at least the mounting hole portion of the mounting portion 2 through which a bolt or the like is inserted is defined by a metal material such as aluminum. It is said that That is, as shown in FIG. 30, the mounting part 2 made of resin material
is formed relatively small, and a cap 2 made of a metal material surrounds the mounting part 2 made of a resin material.
2 is provided.

The cap 22 is provided with a suitable number of attachment holes 22b. Therefore, when attaching the embodiment shown in FIG. 30 to the main body, the mounting portion is fixed to the main body via the bolt through the mounting hole 22b and the cap 22. In this case, since the enlarged part 3a of the hollow part 3 is brought into contact with the main body, the sealing between the blow molded product l and the main body is ensured, and fasteners such as bolts are brought into contact with the metal cap 22. Therefore, the resin portion 2 of the mounting portion will not be deformed.

FIG. 31 shows yet another embodiment of the invention. m
The blow-molded product 1 shown in FIG. 31 has a blow-molded hollow part 3 having a multilayer structure, and in particular, in the example shown in FIG. 31, the hollow part 3 has a two-layer structure including an inner layer 3b and an outer layer 3C. is shown.

For example, when the blow molded product 1 shown in FIG. 31 is used as a water hose such as an automobile radiator hose, the LLC resistance
In addition to properties, good liquid flow characteristics are also required. In such a case, the inner wall surface of the hollow portion 3 is required to have good smoothness, and is required to satisfy a desired mechanical strength as a whole. In such a case, for example, the inner layer 3b is made of PPS without filler, while the outer layer 3C is filled with glass fiber (030
%) PP5G 30% material is used.

With this configuration, the inner layer 3b provides improved flow characteristics to the inner wall surface of the hollow portion 3, while the outer layer 3c provides desired mechanical strength.

Furthermore, in order to increase the adhesive strength between the attachment part 2 and the hollow part 3, it is also possible to use a multilayer structure of two or more layers as shown in FIG. 31.

For example, if a material with good creep resistance is used as the material for the attachment part 2, the adhesive strength with the hollow part 3 to be blow molded may be reduced. In such a case, as the material forming the outer layer 3c of the hollow portion 3, it is possible to use a material that has good adhesiveness to the attachment portion 2. In this case, it is possible to use the outer layer 3c as an adhesive layer that improves adhesion to the mounting portion 2.

Effects As detailed above, according to the present invention, it is possible to efficiently and economically provide a blow-molded product in which a hollow portion and a mounting portion having a mounting surface such as a flange are integrated.

Further, the blow molded product of the present invention has high overall mechanical strength, and in particular, the joint strength between the hollow part and the mounting part is substantially integrated, so that no fluid leaks. Further, since the hollow portion is formed by blow molding, it can be formed into any shape, and the degree of freedom in determining the shape is extremely high. Moreover, the attachment part can be manufactured using any conventionally known molding technique such as injection molding, compression molding, etc., which is advantageous in manufacturing. Furthermore, since the mounting portion and the hollow portion are molded in separate molding processes, it is possible to use different resin materials depending on the required characteristics of each. Therefore, in the present invention, it is possible to selectively use any resin such as a thermoplastic material, a filled resin containing glass fiber or a filler, and a thermosetting resin.

Although specific embodiments of the present invention have been described in detail above, the present invention should not be limited to these specific examples, and various modifications can be made without departing from the technical scope of the present invention. Of course it is.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing one embodiment of the blow-molded product of the present invention, and FIGS. 2 and 3 are schematic perspective views showing specific examples of attachment parts applicable to the blow-molded product of the present invention. 4 to 7 are schematic diagrams showing the detailed configuration of the mounting portion shown in FIG. 2, and FIGS. 8 to 11 are 1
Each schematic diagram showing an embodiment, FIGS. 12 to 17 are each schematic diagram showing one embodiment of manufacturing the blow molded product of the present invention shown in FIG. 18, and FIG. A schematic perspective view showing an example of a molded product, FIG. 19 is a schematic diagram showing a parison extruder that can be used in the manufacturing method shown in FIGS. 12 to 17, and FIG. 20 is a blow molded product of the present invention. FIGS. 21a and 21b are schematic perspective views showing the mounting portion of the blow-molded product 1 in FIG. 20, and FIGS. 22 to 26 are FIG. 20. 27 to 31 are schematic diagrams showing various other embodiments of the blow molded product of the present invention, It is. (Explanation of symbols) 1 Nibro-molded product 2: Mounting part (flange) 3: Hollow part 5: Mold 6: Cavity 7: Parison 11: Die head 12: Parison controller 13: Air pin 14: Parison extruder

Claims (1)

[Scope of Claims] 1. A mounting part made of a first resin material and having at least one through-hole and a mounting surface, and a second mounting part that is inserted into the through-hole and integrated with the mounting part. 1. A blow-molded product having a mounting part characterized by having a blow-molded hollow part made of a resin material. 2. A blow-molded product according to claim 1, having a mounting portion, characterized in that an engaging protrusion is formed to protrude inward from the side wall of the through hole. 3. A blow molded product having a mounting portion according to claim 1 or 2, wherein the first and second resin materials are the same resin material. 4. A blow-molded product having a mounting portion according to claim 1 or 2, wherein the first and second resin materials are different resin materials. 5. Any one of claims 1 to 4
2. A blow molded product having a mounting portion according to item 1, wherein the mounting portion and the hollow portion are at least partially welded and integrated. 6. Any one of claims 1 to 5
2. A blow-molded product having a mounting portion according to item 1, wherein the mounting portion is molded by injection molding or compression molding. 7. Any one of claims 1 to 6
2. The blow-molded product according to item 1, wherein the mounting portion is a flange fixed to one end of the hollow portion. 8. Claim 7, characterized in that a recess is formed around the through hole on the mounting surface of the flange, and a part of the hollow part fills the recess. A blow-molded product with a mounting part. 9. A blow-molded product having a mounting part according to claim 7, characterized in that a cylindrical part is formed standing from the periphery of the through hole on a surface opposite to the mounting surface of the flange. . 10. According to claim 7, the flange is made of a composite of resin and metal, and has a mounting part characterized in that at least bolt holes of the flange are defined from the metal part. Blow molded products. 11. A blow-molded product having a mounting portion according to any one of claims 1 to 10, wherein the hollow portion has a multilayer structure at least partially. 12. Prepare a mounting part made of a first resin material and having at least one through hole formed therein and a mounting surface, insert a parison made of a second resin material into the through hole, and insert it into the through hole. A method for manufacturing a blow-molded product having an attachment part, characterized in that the parison is blow-molded into a hollow part of a desired shape in the above-mentioned state, and the hollow part is integrated with the attachment part by the blow molding. 13. The method of manufacturing a blow molded product having a mounting portion according to claim 12, characterized in that the hollow portion protruding from the mounting surface side is removed.