JP2001062925A - Molded product and manufacture of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow molded product capable of obtaining the sufficient bonding strength between divided bodies consisting of different synthetic resins or the same synthetic resin. SOLUTION: A first divided body 12, consisting of 'nylon 6' having a melting point of 225 deg.C, is bonded to a second divided body 13, consisting of 'nylon 66' having a melting point of 265 deg.C, by an adhesive resin, having compatibility with respect to both nylons respectively and consisting of 'aromatic nylon A' having a melting point of 300 deg.C, higher than those of both nylons. When the bonding resin is cooled and cured, the same resin forms a bonding unit 14 whereby a hollow molded product 11 can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article formed of a synthetic resin used for an oil tank for a power steering of an automobile so as to have an internal hollow portion.

[0002]

2. Description of the Related Art Hitherto, a molded article of a hollow body such as an oil tank has been molded by resin molding. When such a hollow molded article is molded, a pair of molded parts generally formed from the same synthetic resin in a concave shape are butted against each other, and are subjected to a vibration welding method or a method disclosed in Japanese Patent Application Laid-Open No. 9-2628.
As described in No. 68, a molten resin for bonding is injected to the outer periphery of the butted portion, and the molded product is formed by bonding by a method of melting the butted portion by the heat of the molten resin.

[0003]

However, the vibration welding method has a problem in that the joining temperature cannot be sufficiently increased because the butted portions of the two molded parts are melted and softened by frictional heat for joining.

Further, in the method disclosed in the above publication, when the butted portion of a molded part is melted, the molding resin (resin material of the molded part) and the joining resin are the same resin. Temperature cannot be raised sufficiently,
The melting or softening of the butted portion was not sufficient, and the bonding strength was sometimes insufficient.

In recent years, it has been desired that a pair of molded parts formed of different kinds of synthetic resins be joined to each other so as to reduce the cost of the molded article and enhance the functionality of the molded article. This makes it possible to form a part with a hard synthetic resin and the other part with a soft synthetic resin in accordance with the function of the molded article.

Therefore, it is conceivable to join a pair of molded portions formed of different kinds of synthetic resins by a vibration welding method. However, in the case of synthetic resins different from each other, when the vibration welding method is performed because their physical properties, that is, melting points or softening points are different, one molded part melts or softens faster than the other molded part, and both melt or soften uniformly. Since it does not soften, there is a problem that sufficient bonding strength cannot be obtained.

Further, a technique for manufacturing a molded product in which a pair of molded components formed of different kinds of synthetic resins are joined (Japanese Patent Application Laid-Open No.
No. 70855 (hereinafter referred to as a conventional molding method) has also been proposed. This is a type of injection molding method, in which both preformed molded parts are placed in a mold, and a synthetic resin (one molded part) is formed around the butted part of both molded parts by molding the other molded part. This method has a higher melting point and a higher softening point than the synthetic resin used to mold the part.) And abuts the two molded parts with the heat of the filled synthetic resin to integrate the two parts.

However, in the molded article formed by the above-mentioned conventional molding method, the synthetic resin forming the other molded part and the synthetic resin filled in the peripheral parts of both molded parts are the same substance, In some cases, the amount of heat for melting and softening the joints cannot be sufficiently supplied to both molded parts, and the abutting portions of the molded parts are not sufficiently melted or softened, resulting in insufficient joint strength.

In particular, when the above-mentioned molded article is used as an oil tank for a power steering of an automobile, the molded article (oil tank) is constantly exposed to vibrations of the vehicle such as engine vibrations, so that higher joining is achieved. Strength is required.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a molded product having a sufficient joining strength between molded components made of different synthetic resins or the same synthetic resin. is there.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of molded portions made of a first synthetic resin and having a predetermined shape are formed with respect to the first synthetic resin. The gist is that they are bonded to each other with an adhesive resin made of a second synthetic resin having solubility and a melting point or a softening point higher than that of the first synthetic resin. In addition, the compatibility is
This refers to the property that resins of different materials do not separate from each other but melt at the molecular level. Therefore, compatible resins, while maintaining the initial molecular structure respectively,
They can melt and diffuse with each other.

According to a second aspect of the present invention, a plurality of molded portions each having a predetermined shape, each molded from one of a first synthetic resin and a third synthetic resin, which are different synthetic resins, are provided. The gist is that they are compatible with each other with the third synthetic resin and are bonded to each other with an adhesive resin made of the second synthetic resin having a higher melting point or a higher softening point than the both synthetic resins.

According to a third aspect of the present invention, a first molded portion having a predetermined shape made of a first synthetic resin is connected to the first molded portion, and has a higher melting point or higher softening than the first synthetic resin. And a second molded part having a predetermined shape and made of a second synthetic resin having compatibility with the first synthetic resin.

According to a fourth aspect of the present invention, a plurality of molded portions made of a first synthetic resin and having a predetermined shape are arranged in an arrangement space of a molding die, and are compatible with the first synthetic resin. The gist is that a plurality of molded parts are adhered to each other by injecting a molten adhesive resin composed of a second synthetic resin having a higher melting point or a higher softening point than that of the first synthetic resin into a cavity of a molding die and curing the resin. I do.

According to a fifth aspect of the present invention, a plurality of molded portions each having a predetermined shape, each molded from one of the first synthetic resin and the third synthetic resin, are arranged in an arrangement space of a molding die. While having compatibility with the synthetic resin and the third synthetic resin, a molten adhesive resin made of a second synthetic resin having a higher melting point or a higher softening point than the two synthetic resins is injected into the cavity of the mold, By curing
The gist of the invention is to bond a plurality of molded parts to each other.

According to a sixth aspect of the present invention, a first molding portion having a predetermined shape made of a first synthetic resin is arranged in a space where a molding die is arranged, and is connected to the first molding portion. A molten resin composed of a second synthetic resin having a higher melting point or a higher softening point than that of the first synthetic resin and having compatibility with the first synthetic resin is injected into the cavity of the molding die, and cured, The gist is to form two molded parts.

(Function) Therefore, in the molded product according to the first aspect, the plurality of molded portions made of the first synthetic resin are joined to the second molded portion by the heat of the adhesive resin made of the second synthetic resin. Is melted or softened. Further, since the adhesive resin is compatible with any of the plurality of molded parts, the plurality of molded parts and the adhesive resin are diffused with each other while maintaining the initial molecular structure. Therefore, the plurality of molded portions and the adhesive resin are firmly fixed and fixed.

Further, in the molded article according to the second aspect, the joining of the molded part made of the first synthetic resin and the third synthetic resin with the second molded part by the heat of the adhesive resin made of the second synthetic resin. The part to be melted or softened.
Further, since the adhesive resin is compatible with any of the plurality of molded parts, the plurality of molded parts and the adhesive resin are diffused with each other while maintaining the initial molecular structure. Therefore, the plurality of molded portions and the adhesive resin are firmly fixed and fixed.

Further, in the molded article according to the third aspect, the second molded portion made of the second synthetic resin having a higher melting point or a higher softening point than the first synthetic resin is the first molded part made of the first synthetic resin. Sufficient heat can be provided to the joint of the parts, and the joint of the first molded part with the second molded part is melted or softened. Further, since the second molded portion is compatible with the first molded portion, the two molded portions are mutually diffused while maintaining the initial molecular structure. Therefore,
The first molding portion and the second molding portion are firmly joined and fixed.

Further, in the method of manufacturing a molded product according to the present invention, a plurality of molded portions made of the first synthetic resin are arranged in a space where the molding die is arranged, and have a higher melting point or a higher softening than the first synthetic resin. A molten adhesive resin made of a second synthetic resin having dots is injected into the cavity. Then, since the adhesive resin is compatible with any of the plurality of molded parts, the plurality of molded parts and the adhesive resin are mutually diffused while maintaining the initial molecular structure, and then cured. A molded product in which a plurality of molded portions are bonded to each other is molded.

Further, in the method of manufacturing a molded product according to the fifth aspect, a plurality of molded portions made of any one of the first synthetic resin and the third synthetic resin are arranged in a space where a molding die is arranged.
A second resin having a higher melting point or a higher softening point than both synthetic resins;
A molten adhesive resin made of a synthetic resin is injected into the cavity. Then, since the adhesive resin is compatible with any of the plurality of molded parts, the plurality of molded parts and the adhesive resin are mutually diffused while maintaining the initial molecular structure, and then cured. A molded product in which a plurality of molded portions are bonded to each other is molded.

In the method of manufacturing a molded product according to the present invention, the first molded portion made of the first synthetic resin and having a predetermined shape is arranged in the arrangement space of the molding die, and is higher than the first synthetic resin. A molten molten resin made of a second synthetic resin having a melting point or a high softening point is injected into the cavity. Then, since the molten resin is compatible with the first molded portion, the first molded portion and the molten resin are diffused with each other while maintaining the initial molecular structure, and thereafter, when the molten resin is cured. The molten resin becomes a second molded portion, and the molded product is molded by bonding the first molded portion and the second molded portion to each other.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a hollow molded article 11 as a molded article has a bottomed cylindrical first divided body 12 as a molded section made of "nylon 6", and a molded section made of "nylon 66". And the second divided body 13 having a cylindrical shape as a cover is bonded at the butting peripheral portion thereof with an adhesive resin made of “aromatic nylon A”. Hereinafter, the portion joined by the adhesive resin is referred to as a joint 14.

In the present embodiment, "nylon 6" is used as the first synthetic resin, and "aromatic nylon A" is used as the second synthetic resin.
(Trade name: HTN51G35HSL, manufactured by Zytel) and “Nylon 66” as the third synthetic resin.
The melting points of “Nylon 6”, “Aromatic Nylon A”, and “Nylon 66” are 225 ° C., 300 ° C., and 265 ° C., respectively.
° C.

The relationship between these resins is that the second synthetic resin as the adhesive resin has compatibility with the first and third synthetic resins as the resin for molding the divided bodies 12 and 13 and has a high melting point or a high melting point. It is essential to have a high softening point. The material of each resin is arbitrary as long as it satisfies this condition.
The synthetic resin and the third synthetic resin may be of the same material.

Flanges 15 and 16 protrude from the outer periphery of the two divided bodies 12 and 13 in the vicinity of the opening, respectively, and a space between the two flanges 15 and 16 is filled with a molten resin (adhesive resin) heated to a melting point or higher in advance. It is adhered by being done.

Next, the hollow body forming apparatus 17 for manufacturing the hollow molded article 11 will be described. As shown in FIG. 3A, the hollow body forming apparatus 17 includes a fixed mold 18 and a movable mold 1.
9, a mold clamping device 20, a projecting device 21, and an injection device 23.

The movable mold 19 is attached to the mold clamping device 20 and is disposed so as to be able to approach and separate from the fixed mold 18. In the fixed mold 18 and the movable mold 19, a pair of divided body storage recesses 18a, 1
9a are respectively formed. In addition, the fixed mold 18
Is provided with a protruding device 21, and a protruding pin 24 of the protruding device 21 protrudes toward the divided body storage recess 18a.

As shown in FIG. 4, stepped portions 25a and 25b are formed circumferentially at the opening edges of the concave surfaces 18a and 19a. Between the butting surfaces of the fixed die 18 and the movable die 19, the fixed die 1 is moved from both step portions 25a and 25b.
8 and the gate 26 and sprue 2 toward the outside of the movable mold 19.
7 are formed so as to communicate with each other. Hereinafter, the gate 26 and the sprue 27 are referred to as a filling passage 22. And
An injection device 23 is provided so as to be able to approach and separate from the sprue 27, and a molten resin is injected from the tip of the injection device 23 toward the filling passage 22.

Next, a method of manufacturing the present invention using the hollow body forming apparatus 17 will be described. As shown in FIG. 2 (a), the two divided bodies 12, 1 formed in a separate process in advance.
The first divided body 12 is placed in the divided body storage recess 18a and the second divided body 13 is placed in the divided body storage recess 19a so that the openings 3 face each other.

As shown in FIG. 2B, the mold clamping device 20
When the movable mold 19 is lowered and the movable mold 19 and the fixed mold 18 are brought into contact with each other, the openings of the divided bodies 12 and 13 come into contact with each other. As a result, a cavity 29 is formed in the space between the two step portions 25a and 25b except for the two flanges 15 and 16 of the hollow molded article 11.

As shown in FIG. 3 (a), the injection device 23 is brought into contact with the sprue 27, and the molten resin (adhesive resin) made of "aromatic nylon A" is heated from the tip of the injection device 23 to the melting point or higher. ) Is injected, and the molten resin is filled into the cavity 29 through the filling passage 22. That is,
Since the molten resin having a higher melting point than the divided bodies 12 and 13 is filled in the periphery of the butted portion of the divided bodies 12 and 13, the periphery is melted by the heat of fusion of the filled molten resin.

Then, since the molten resin is compatible with both the first divided body 12 and the second divided body 13, the first divided body 12 and the second divided body 13 and the molten resin are respectively in the initial state. While maintaining the molecular structure, they are melt-diffused with each other. Then, when the joining portion 14 is formed by cooling and setting of the molten resin, the first divided body 12 and the joined portion 14 and the second divided body 13 and the joined portion 14 are firmly joined and fixed.

As shown in FIG. 3B, after the joint portion 14 is formed, the movable mold 19 is separated from the fixed mold 18 by the mold clamping device 20, and the projecting pin 24 of the projecting device 21 is inserted into the divided body insertion surface. 18a, the hollow molded article 1
1 is taken out.

Therefore, according to the hollow molded article 11 of the present embodiment, the following effects can be obtained. (1) In the present embodiment, the first nylon 6
Divided body 12 and second divided body 13 made of "nylon 66"
Are sufficiently fused and fixed at the joint portion 14 made of "aromatic nylon A", and the hollow molded article 1
In 1, the joining strength between the first divided body 12 and the second divided body 13 can be sufficiently increased. For this reason, the hollow molded article 11 having a high joining strength can be obtained without any inconvenience even when used in an environment constantly exposed to vibration, such as an oil tank for a power steering of an automobile. (2) In the present embodiment, since the second synthetic resin as the adhesive resin is compatible with both of the divided bodies 12 and 13, the divided bodies 1 of different (not compatible) synthetic resins are used.
2 and 13 can be joined, the degree of freedom in material selection can be increased, the cost of the hollow molded article 11 can be reduced, and the functionality of the hollow molded article 11 can be enhanced. (3) Since the hollow body forming apparatus 17 used in the present embodiment is a widely used forming apparatus, the present invention can be implemented without newly investing equipment. (4) In the vibration welding method, a heat generation time required for welding is required in a step of joining the members to each other, so that the welding time becomes long. Therefore, 1 for forming the hollow molded article 11
The process took a long time. In this embodiment, since the adhesive resin that has been heated and melted in advance is filled between the flanges 15 and 16 of the divided bodies 12 and 13, the welding time is shortened. Therefore, the time for one step of molding the hollow molded article 11 can be shortened as compared with the vibration welding method.

In the vibration welding method, the joining surfaces to be joined to each other need to be flat in order to move in the vibration direction at the time of vibration. However, when an adhesive resin melted in advance is used as in this embodiment, Since the joining surface does not need to be flat, welding in a three-dimensional shape is also possible.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings. In the present embodiment, as the first synthetic resin, "nylon 6"
"Nylon 66" is used as a synthetic resin.

As shown in FIG. 6, a molded product 31 with a nipple as a molded product is a substantially cylindrical molded part 32 having a bottom as a first molded part made of "nylon 6," and a circle at the bottom of the molded part 32. And a nipple 35 as a second molded portion made of a cylindrical “nylon 66” joined to the hole 34 having a shape.

Next, a description will be given of a molding apparatus 36 for producing the molded article 31 with a nipple. As shown in FIG. 6, the molding device 36 includes a fixed mold 37, a movable mold 38,
And an injection device 40.

The contact surfaces of the fixed mold 37 and the movable mold 38 which are in contact with each other are provided with a pair of concave surfaces 37a, 3
8a are formed respectively, and the female side molding surface 37a
And the male side molding surface 38a, an arrangement space 32a and a cavity 35a are formed.
2 are arranged. The cavity 35a has the same shape and size as the nipple 35. The arrangement space 32a and the cavity 35a communicate with each other. Further, the gate 41 and the sprue 42 are fixed from the female molding surface 37a in the opposite direction to the movable mold 38.
7 is formed so as to communicate with the cavity 35a. Hereinafter, the gate 41 and the sprue 42 are connected to the charging passage 3.
9 is assumed. The injection device 40 is provided so as to contact the sprue 42.

Next, a method for manufacturing the molded article 31 with a nipple using the molding apparatus 36 will be described. As shown in FIG. 6, a molded part 32 that has been molded in another process in advance is arranged in an arrangement space 32 a of a fixed mold 37, and the fixed mold 37 and the movable mold 38 are brought into contact with each other. Next, a molten resin made of “nylon 66” and heated to a temperature equal to or higher than the melting point is injected from the tip of the injection device 40, and the cavity 35 a is filled with the molten resin through the filling passage 39. That is, since the molten resin having a higher melting point than the molded part 32 is filled so as to be in contact with the edge of the circular hole 34 of the molded part 32, the edge of the circular hole 34 is filled with the molten resin. Melted by the heat of fusion.

Then, since the molten resin is compatible with the edge of the circular hole 34, the molten resin is melt-diffused with the edge of the circular hole 34 while maintaining the initial molecular structure. Then, as the molten resin cools and hardens, it is firmly joined and fixed. At this time, the molten resin is cooled and hardened, whereby the nipple 35 as the second molded portion is molded. Then, the molded product 31 with a nipple is molded.

Therefore, the molded product 3 with the nipple of the present embodiment
According to 1, the following effects can be obtained. (5) In the present embodiment, the nipple 35 is formed by injecting “Nylon 66” which is compatible with “Nylon 6”, and the edge of the circular hole 34 of the molded part 32 made of “Nylon 6”. The nipple 35 is welded and fixed to the portion.
Therefore, the edge of the circular hole 34 of the molded part 32 is sufficiently joined and melted and fixed. Therefore, it is possible to obtain a molded product 31 with a nipple having a sufficient bonding strength between the molded component 32 and the nipple 35. (6) Since the molding device used in the present embodiment is a general molding device, the present invention can be implemented without newly investing equipment. (7) In the present embodiment, it is possible to perform three-dimensional welding in which the welding surfaces are not on the same plane. (8) In the molded article 31 with a nipple of the present embodiment, the molten resin which is compatible with the edge and is heated to a melting point or higher in advance so as to be in contact with the edge of the circular hole 34 of the molded part 32. And the molten resin is cooled and cured to form the nipple 35. Therefore, the molded part 3
Unlike the case where the nipple 35 formed separately in advance is insert-molded into the circular hole 34 of FIG. 2, the boundary surface between the molded component 32 and the circular hole 34 is securely welded, and between them. Since no gap is generated, the sealing performance can be ensured. (9) As in the present embodiment, if resins are compatible with each other, different materials can be welded, so that a combination with a low-cost material suitable for a product can be obtained.

The embodiment of the present invention may be modified as follows in addition to the above embodiment. In the first embodiment, the two-stage portions 25a and 25 of the hollow body forming device 17 are used.
Instead of b, as shown in FIG. 5, step portions 30a and 30b may be formed so that cavities covering the entire flanges 15 and 16 of both divided bodies 12 and 13 can be formed. By doing so, the same effects as in the above (1) to (4) can be obtained, and the entire flanges of the hollow molded product 11 are fixed at the joints 14, so that the first divided body of the hollow molded product 11 is further formed. The joining strength between the second and third divided bodies 13 is increased.

In the first embodiment, "nylon 6" is used as the first synthetic resin, and "aromatic nylon A" (product name: AS-4133H manufactured by Amodel Co., Ltd.) is used as the second synthetic resin.
S) "and" nylon 66 "as the third synthetic resin.

The first synthetic resin was made of "Nylon 6", the second synthetic resin was made of "aromatic nylon B" (trade name: AS-4133HS, manufactured by Amodel), and the third synthetic resin was made of "aromatic nylon A". May be used. The melting point of “aromatic nylon B” is 320 ° C. Even in this case, the same effects as those of the above (1) to (4) can be obtained.

In the first embodiment, the first and third synthetic resins may be "nylon 6" and the second synthetic resin may be "nylon 66". Alternatively, the first and third synthetic resins may be “polypropylene (PP)”, and the second synthetic resin may be “(PP / nylon) alloy”.
Alternatively, "(PP / nylon) alloy" may be used as the first and third synthetic resins, and "nylon 6" may be used as the second synthetic resin. Alternatively, "nylon 66" may be used as the first and third synthetic resins, and "aromatic nylon A" may be used as the second synthetic resin. Alternatively, "nylon 6" may be used as the first and third synthetic resins, and "aromatic nylon A" may be used as the second synthetic resin. Alternatively, “nylon 6” may be used as the first and third synthetic resins, and “aromatic nylon B” may be used as the second synthetic resin. Alternatively, “aromatic nylon A” may be used as the first and third synthetic resins, and “aromatic nylon B” may be used as the second synthetic resin.

In this case, the same effects as in the above (1) to (4) can be obtained. In the second embodiment, "nylon 6" is used as the first synthetic resin, and "aromatic nylon A" is used as the second synthetic resin.
Was used.

This may be "nylon 6" as the first synthetic resin and "nylon 66" as the second synthetic resin. Alternatively, as the first synthetic resin, “polypropylene (P
P) "and" (PP / nylon) alloy "as the second synthetic resin. Alternatively, as the first synthetic resin, “(PP
Nylon alloy ”and“ Nylon 6 ”as the second synthetic resin. Alternatively, “nylon 66” may be used as the first synthetic resin, and “aromatic nylon A” may be used as the second synthetic resin. Alternatively, “nylon 6” may be used as the first synthetic resin, and “aromatic nylon A” may be used as the second synthetic resin. Alternatively, “nylon 6” may be used as the first synthetic resin, and “aromatic nylon B” may be used as the second synthetic resin.
Or, "aromatic nylon A" as the first synthetic resin,
"Aromatic nylon B" may be used as the synthetic resin.

In this case, the same effects as in the above (5) to (9) can be obtained. In the first embodiment, the two divided bodies 12 and 13 made of the first synthetic resin and the third synthetic resin having a low melting point are combined with the first synthetic resin and the third synthetic resin while having a high melting point. Welding and joining were performed using an adhesive resin made of a second synthetic resin having solubility.

The two divided bodies 12 and 13 made of the first synthetic resin and the third synthetic resin having a low softening point are mixed with the first synthetic resin and the third synthetic resin while having a high softening point. May be welded and joined with an adhesive resin made of a second synthetic resin having the following.

In this way, the abutting portion of the two divided bodies 12 and 13 has a higher softening point than the two divided bodies 12 and 13, and the softened resin (adhesive resin) heated in advance to the softening point is The divided portions 12 and 13 are filled around the butted portion and are softened by the softening heat of the softening resin. Then, the softened resin is compatible with either the first divided body 12 or the second divided body 13 even when both divided bodies 12 and 13 are softened. The softening resin and the softening resin are mutually diffused while maintaining the initial molecular structure. Then, when the softening resin cools and hardens, the joint 14 is formed.

Accordingly, the same effects as in the above (2) to (4) can be obtained, and the softening of the joint is sufficiently performed and the joint is fixed. Therefore, in the hollow molded article 11, the first divided body 12 and the second divided body 13 are formed. And the bonding strength with the substrate can be sufficiently increased.

In the second embodiment, the first synthetic resin having a high melting point is provided so as to be in contact with the edge of the circular hole 34 of the molded part 32 made of the first synthetic resin having the low melting point. On the other hand, the nipple 35 made of the second synthetic resin having compatibility is injection-molded.

This has a high softening point and has a high softening point so as to be in contact with the edge of the circular hole 34 of the molded part 32 made of the first synthetic resin having a low softening point. Nipple 35 made of a compatible second synthetic resin
May be injection molded.

In this manner, the edge of the circular hole 34 of the molded part 32 has a higher softening point than that of the molded part 32, and the softened resin which has been heated to a high softening point or higher in advance is formed on the molded part 32. Filled in contact with the edge of the circular hole 34,
It is softened by the heat of softening of the softening resin. Then, the softened resin is compatible with the edge of the circular hole 34 even in a state where the edge of the circular hole 34 is softened, so that the edge of the circular hole 34 and the softened resin are respectively They are diffused from each other while maintaining the initial molecular structure. When the softened resin cools and hardens, the nipple 35 is formed.

Therefore, the same effects as in the above (5) to (9) can be obtained.

[0059]

According to the first aspect of the present invention, a plurality of molded portions molded from the first synthetic resin are compatible with the first synthetic resin and have a higher melting point than the first synthetic resin. Alternatively, the bonding strength can be sufficiently increased because the bonding force is fixed by an adhesive resin made of a second synthetic resin having a high softening point.

According to the second aspect of the present invention, the first molded portion molded from the first synthetic resin and the third molded portion molded from the third synthetic resin are combined with the first synthetic resin and the third synthetic resin. Since it is compatible with the resin and is bonded and fixed by an adhesive resin made of a second synthetic resin having a higher melting point or a higher softening point than both synthetic resins, the bonding strength can be sufficiently increased.

According to the third aspect of the present invention, the joining strength between the first molded portion and the second molded portion can be sufficiently increased. According to the fourth aspect of the invention, the molded article according to the first aspect can be easily manufactured.

According to the invention described in claim 5, according to claim 2
Can be easily manufactured. According to the sixth aspect of the invention, the molded product according to the third aspect can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a sectional view of a molded article according to a first embodiment.

FIG. 2A is an explanatory view of a state where a movable mold in a hollow body forming apparatus is raised, and FIG. 2B is an explanatory view of a state where the movable mold is also lowered.

FIG. 3A is an explanatory view showing a state in which an adhesive resin is filled, and FIG. 3B is an explanatory view showing a state in which a movable mold is raised and a molded product is taken out.

FIG. 4 is a partially enlarged explanatory view of FIG.

FIG. 5 is an explanatory view of a molding operation of a molded article in another example of the first embodiment.

FIG. 6 is an explanatory diagram of a molding operation of a molded article according to the second embodiment.

[Explanation of symbols]

11: hollow molded article as molded article; 12: first divided body as molded part; 13: second divided body as molded part;
... Joined part as adhesive resin, 31 ... Nipple molded article as molded article, 32 ... Molded part as first molded part, 3
5: Nipple as a second molded part.

Claims (6)

[Claims] 1. A plurality of molded parts having a predetermined shape made of a first synthetic resin, which are compatible with the first synthetic resin and have a higher melting point or a higher softening point than the first synthetic resin. Molded products bonded to each other with an adhesive resin made of synthetic resin. 2. A plurality of molded parts each having a predetermined shape, each molded from one of a first synthetic resin and a third synthetic resin which are different from each other, with respect to the first synthetic resin and the third synthetic resin. Molded articles each having compatibility with each other and bonded to each other with an adhesive resin made of a second synthetic resin having a higher melting point or a higher softening point than both synthetic resins. 3. A first molded part made of a first synthetic resin and having a predetermined shape, the first molded part being connected to the first molded part, and having a first shape.
Along with having a higher melting point or higher softening point than synthetic resins,
And a second molded portion having a predetermined shape made of a second synthetic resin having compatibility with the first synthetic resin. 4. A plurality of molded portions having a predetermined shape made of a first synthetic resin are arranged in an arrangement space of a mold, and are compatible with the first synthetic resin and have a higher melting point than the first synthetic resin. Alternatively, a method of manufacturing a molded product in which a plurality of molded portions are bonded to each other by injecting a molten adhesive resin made of a second synthetic resin having a high softening point into a cavity of a mold and curing the resin. 5. A plurality of molded parts each having a predetermined shape, each molded from one of the first synthetic resin and the third synthetic resin, are arranged in an arrangement space of a mold, and the first synthetic resin and the third synthetic resin are provided. Injection into the cavity of the molding die, which is compatible with the second synthetic resin having a higher melting point or a higher softening point than both synthetic resins, and is cured, whereby a plurality of A method of manufacturing a molded product in which molded parts are bonded to each other. 6. A first molding portion made of a first synthetic resin and having a predetermined shape is arranged in an arrangement space of a molding die, and has a higher melting point than the first synthetic resin so as to be connected to the first molding portion. Alternatively, a molten resin having a high softening point and made of a second synthetic resin having compatibility with the first synthetic resin is injected into a cavity of a molding die and cured to form a second molded portion. Product manufacturing method.