JP2001260226A - Hollow resin container and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly weld sheet materials mutually. SOLUTION: Intermediate molded articles 10, 12 made of a resin are molded by injection molding and each of them is constituted by providing a sheet material 13 for preventing the transmission of fuel to the inner peripheral surface of a resin layer 15. A recessed part 19A is formed to the region, where the end part 13A of the sheet material 13 is applied, of the mating surface 19 of each of the intermediate molded articles 10, 12 and the projection quantity of the projected part 19B of the mating surface from the sheet material 13 applied to the recessed part 19A is set in consideration of the extrusion quantity of the resin at the time of welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hollow resin container and a method of manufacturing the same, and more particularly, to a hollow resin container such as a fuel tank mounted on an automobile and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as one of hollow resin containers such as a fuel tank mounted on an automobile and a method of manufacturing the same,
There is a method in which a plurality of divided resin molded intermediate products are integrally formed into a hollow shape by welding the joint surfaces of each other, and an example thereof will be described below.

As shown in FIG. 7, in this method for manufacturing a hollow resin container, an upper jig 104 for supporting an intermediate molded product 100 composed of a main body resin layer 100A and a fuel permeation prevention sheet material 100B, and a main body resin layer 102A When the lower jig 106 for supporting the intermediate molded product 102 made of the fuel permeation preventing sheet material 102B and the lower jig is brought close to each other,
06A overlaps the outer peripheral portion 104A of the upper jig 104, the compressed resin is indicated by an arrow W when welding the joint of the intermediate molded product 100 and the joint of the intermediate molded product 102. So that it flows only inside the container. As a result, in this method of manufacturing a hollow resin container, the resin melted at the joint of the intermediate molded product 100 and the joint of the intermediate molded product 102 forms the convex 110 on the inner side of the welded part 108, and the welded part 108 The formation of small burrs having a constriction at the root of the slab can be suppressed.

[0004]

However, in this method of manufacturing a hollow resin container, the intermediate molded articles 100, 102
Resin layer 100A, 102A and sheet material 100 in FIG.
B and 102B are simultaneously welded at the welding portion 108 at a high temperature. As a result, the sheet materials 100B and 102B are melted at the welded portion 108 and the resin layer 100B is melted.
A and 102A are mixed in the vicinity of the welding portion 108, and the welding strength is reduced. In order to improve this, when the ends of the sheet materials 100B and 102B in the welded portion 108 are shortened, as shown in FIG. 8, the resin layers 100A and 102A bulge inside the container, so that the sheet materials 100B and 102B 102B
A gap S is generated between the sheet materials, so that the sheet materials cannot be reliably welded to each other.

[0005] In view of the above facts, the present invention provides a hollow resin container and a method of manufacturing the hollow resin container which do not impair the high welding strength even if the fuel permeation resistance is improved by ensuring that the sheet materials are welded to each other. The aim is to get a method.

[0006]

According to a first aspect of the present invention, there is provided a hollow resin container in which a plurality of intermediate molded products having a resin layer on the outside of a sheet material are superposed and welded to each other. A concave portion is formed in the mounting portion of the sheet material on the mating surface of the above and welded.

Therefore, since the sheet material is located in the concave portion on the mating surface of the intermediate molded product, the resin layer is welded before the sheet material. As a result, the sheet material is less likely to be affected by welding between the resin layers, and thereafter, reliable welding suitable for the sheet materials can be performed.

According to a second aspect of the present invention, in the hollow container according to the first aspect, a gap forming means for storing the molten resin is provided and welded to a portion outside the container adjacent to the concave portion. .

Therefore, in addition to the contents described in claim 1,
At the time of welding, the molten resin flowing toward the sheet material is stored in gap generating means provided at a portion outside the container adjacent to the concave portion. As a result, the time for the molten resin to reach the sheet material is delayed, so that the sheet materials can be reliably welded to each other before the molten resin reaches the sheet material and enters between the mating surfaces of the sheet materials.

According to a third aspect of the present invention, there is provided a hollow resin container in which peripheral portions of a plurality of intermediate molded products having a resin layer on the outside of a sheet material are overlapped and welded to each other, The welding is performed by changing the temperature of the mounting portion of the material to the temperature of another portion on the mating surface of the intermediate molded product.

Therefore, for example, when the welding temperature of the resin layer is higher than the melting point of the sheet material, the temperature of the mounting portion of the sheet material on the mating surface of the intermediate molded product is made lower than the temperature of the other parts, thereby melting the sheet material. Mixing can be prevented, and the temperature of the outer portion of the resin layer can be kept high, so that the molten resin outside the resin layer can be made to flow. Therefore, high welding strength can be ensured while reliably welding the sheet materials at the ends.
On the other hand, for example, when the welding temperature of the resin layer is lower than the melting point of the sheet material, the welding of the sheet materials is performed by setting the temperature of the mounting portion of the sheet material on the mating surface of the intermediate molded product higher than the temperature of other parts. It becomes possible, and the temperature of the outer portion of the resin layer can be maintained at a required temperature condition, so that the molten resin outside the resin layer can flow. Therefore, high welding strength can be ensured while reliably welding the sheet materials at the ends.

According to a fourth aspect of the present invention, there is provided a hollow resin container in which the peripheral portions of a plurality of intermediate molded products having a resin layer on the outside of a sheet material are overlapped and welded, and the sheet at the mating surface of the intermediate molded products is provided. The material is welded such that an extension of the material to the resin layer side is 1 to 5 times the thickness of the intermediate molded product.

[0013] Therefore, by extending the sheet material to the resin layer side by 1 to 5 times the thickness of the intermediate molded product, the sheet material at the mating surface of the sheet materials at the end of welding on the resin layer side. Since the welding between the members can be maintained, it is possible to prevent the occurrence of a gap.

According to a fifth aspect of the present invention, there is provided the present invention.
4. In the hollow resin container according to any one of items 4,
The joint surface is welded by applying pressure from outside the intermediate molded product.

Therefore, in addition to the contents described in any one of the first, third and fourth aspects, during welding, pressure is applied from the outside of the intermediate molded product to the mating surface of the intermediate molded product so as to be welded. The molten resin is caused to flow from the portion toward the sheet material side, and the above-described operation can be obtained.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a hollow resin container in which peripheral parts of a plurality of intermediate molded products having a resin layer on the outside of a sheet material are overlapped and welded. The sheet material is arranged in a concave portion formed in the mounting portion of the sheet material on the mating surface so as to be extended by 1 to 5 times the thickness of the intermediate molded product, and the sheet material on the mating surface of the intermediate molded product is arranged. The temperature of the mounting portion is changed from the temperature of the other portion on the mating surface of the intermediate molded product, and pressure is applied to the mating surface from outside the intermediate molded product to perform welding.

Therefore, since the sheet material is located in the concave portion on the mating surface of the intermediate molded product, the resin layer is welded before the sheet material, and the sheet material is hardly affected by the welding of the resin layer. By making the extension of the sheet material 1 to 5 times the thickness of the intermediate molded product, the welding of the sheet materials can be maintained at the mating surface of the sheet materials at the end of the welding on the resin layer side. Therefore, generation of a gap can be prevented. Further, since the temperature of the mounting portion of the sheet material on the mating surface of the intermediate molded product and the temperature of other parts were changed, and the pressure was applied to the mating surface of the intermediate molded product from outside the intermediate molded product, the sheet material was welded. The molten resin is allowed to flow from the outer portion of the resin layer toward the sheet material while preventing the molten material from being mixed in and allowing the sheet materials to be welded to each other. As a result, high welding strength can be ensured while reliably welding the sheet materials at the ends.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hollow resin container (in this embodiment, a fuel tank for an automobile) according to an embodiment of the present invention and a method for manufacturing the same will be described in detail with reference to FIGS.

As shown in FIG. 2, in this embodiment, a plurality of (in this embodiment, two upper and lower) resin intermediate molded products (hereinafter, referred to as intermediate molded products) 10 having a concave shape and an opening peripheral portion, A pair of upper jigs 1 for welding press of 12
4 and the lower jig 16 respectively. Each of the intermediate molded products 10 and 12 is formed by injection molding or the like, and has a configuration in which a sheet material 13 formed of a film for preventing fuel permeation is provided on the inner peripheral surface of the resin layer 15. In addition, as a sheet material, a P layer using an EVOH material (ethylene-vinyl alcohol copolymer resin) for a barrier layer is used.
Multilayer film with E material (polyethylene resin), or
The barrier layer may have a single-layer or multilayer structure using a nylon-based material, a fluorine-based material, a polyacrylonitrile-based material, a polyketone-based material, or the like. As the material of the resin layer 15, a single layer of HDPE material (high-density polyethylene resin) or another PE material, PP material, nylon material, EVOH material, fluorine material, polyketone material, or the like is used. It may have a single-layer or multilayer structure.

The mating surface 1 of the intermediate molded products 10 and 12
9, a concave portion 19A is formed at a portion where the end portion 13A of the sheet material 13 is mounted, and the amount of protrusion of the convex portion 19B on the mating surface 19 from the sheet material 13 mounted in the concave portion 19A is determined by resin extrusion during welding. It is set to h in consideration of the amount.

The mating surface 1 of the intermediate molded products 10 and 12
9, a portion outside the container adjacent to the concave portion 19A,
That is, an inclined portion 19C is formed between the concave portion 19A and the convex portion 19B as gap forming means for storing the molten resin.

The sheet material 13 on the mating surface 19
When the length Lf of the intermediate molded products 10 and 12 near the mating surface 19 is represented by t, and the width obtained by combining the concave portion 19A and the inclined portion 19C is represented by Lh, t ≦ Lf
≦ Lh ≦ 5t.

In this embodiment, as shown in FIG. 3, a cut-off valve 18 and
Attached parts such as an inlet pipe 22 and a fuel pump mounting opening 24 are provided.
Accessories such as a sub tank 26 and a separator 28 are provided.

As shown in FIG. 1A, the intermediate molded product 1
0 and the joint 12A of the intermediate molded product 12 are flange portions facing each other.
Convex portions 10B and 12B are formed on the outer ends of the containers 0A and 12A, respectively, on the sides that are separated from each other, that is, toward the upper side of the paper at the joint 10A and toward the lower side of the paper at the joint 12A.

A hot plate 30 is disposed between the joint 10A of the intermediate molded product 10 and the joint 12A of the intermediate molded product 12, and the hot plate 30 is used to connect the hot plate 30 to the intermediate molded product 10. And the joint 12A of the intermediate molded article 12 are melted. In each drawing, the molten portions of the intermediate molded products 10 and 12 are shown with different hatching.

The side cross-sectional shape of the hot plate 30 is T-shaped, and is mainly located inside the intermediate molded products 10 and 12, and melts the inner surfaces 10C and 12C of the joints 10A and 12A and the vicinity thereof. A standing wall portion 30A, a heat insulating portion 30B connected to the standing wall portion 30A and mainly melting the joining surfaces 10D and 12D corresponding to the end portions 13A of the sheet material 13, and a heat insulating portion 30B mainly connected to the heat insulating portion 30B. , Convex portion 1 on mating surface 19
It is composed of a horizontal portion 30C that melts 9B.

Assuming that the length of the standing wall portion 30A of the hot plate 30 extending toward the heat insulating portion 30B is Ln and the thickness of the heat insulating portion 30B is td, Ln <t and Ln + td ≒ Lf. A cooling pipe 31 is provided inside the standing wall 30A of the hot plate 30.

Therefore, when the hot plate 30 is heated, the hot plate 3
The temperature of the heat insulating portion 30B is lower than the temperature of the horizontal portion 30C, and the temperature of the heat insulating portion 30B is lower than the temperature of the horizontal portion 30C.
The temperature of the standing wall portion 30A is further lower than the temperature of (3). In addition, the intermediate part 1 is formed by the horizontal portion 30C of the hot plate 30.
The convex portions 19B in the mating surfaces 19 of 0 and 12 melt,
The joining surfaces 10D and 12D corresponding to the end 13A of the sheet material 13 are melted by the heat insulating portion 30B of the hot plate 30, and the joining portions 10A and 12A are melted by the standing wall portion 30A of the hot plate 30.
Inner surfaces 10C and 12C and the vicinity thereof are melted. Also, the joint 10 of the intermediate molded products 10 and 12
Chamfers 10E, 12E are formed at the boundaries between A, 12A and the inner side surfaces 10C, 12C.

That is, in the present embodiment, the intermediate molded product 10,
The temperature of the mounting portion of the sheet material 13 on the twelve mating surfaces 19 is set lower than the temperature of other parts of the mating surface 19.

The lower jig 16 is provided with a seal 16C on the outer side of the concave portion 16B toward the upper jig 14, and as shown in FIG. When the upper jig 14 and the lower jig 16 are brought close to each other when welding the joint 10A of the intermediate molded product 12 and the joint 10A of the intermediate molded product 12, the distal end of the seal portion 16C causes the outer peripheral portion 14C of the upper jig 14 to be welded. So that it overlaps outside. Note that reference numeral 1 in FIG.
The gap indicated by 7 may be omitted.

In this embodiment, when the melting point of the sheet material 13 is higher than the welding temperature of the resin layer, the cooling pipe 31 of the hot plate 30 is disposed not on the standing wall 30A but on the horizontal portion 30C to thereby obtain the temperature distribution. May be reversed (the temperature of the standing wall portion 30A is higher than the temperature of the horizontal portion 30C). As shown in FIG. 4, the mating surface 19 of the intermediate molded products 10 and 12 may be arranged above the liquid level 40A of the fuel 40 when the fuel tank as the hollow resin container 20 is full.

Next, the operation of the present embodiment will be described.

In the present embodiment, after the joints 10A and 12A of the intermediate molded products 10 and 12 are melted by heating with the hot plate 30, the intermediate molded product 10 and the intermediate jig 10 are interposed together with the upper jig 14 and the lower jig 16. The molded product 12 is moved by a predetermined distance in a direction to separate, and the hot plate 30 is pulled out of the container (the direction of the arrow A in FIG. 1A). Thereafter, along with the upper jig 14 and the lower jig 16, the intermediate molded product 10 and the intermediate molded product 12 are moved in a direction of approaching (for example, the upper jig 14 is moved in a direction indicated by an arrow B in FIG. 1B). The state shown in FIG. Thereafter, the intermediate molded product 10 and the intermediate molded product 12 are further moved in a direction of approaching (for example, the upper jig 14 is moved in the direction of arrow B in FIG. 1C),
The state shown in FIG. Then, after cooling the hollow resin container while applying internal pressure, the upper jig 14 and the lower jig 1 are cooled.
6 and the hollow resin container 20 is taken out.

At this time, in the present embodiment, the intermediate molded product 1
End 1 of sheet material 13 at mating surface 19 of 0, 12
3A is disposed in a concave portion 19A formed in the mating surface 19, and a convex portion 19B having a protrusion amount h from the end portion 13A of the sheet material 13 is welded first. Therefore, the molten resin flows toward the end 13A of the sheet material 13, and is stored in the gap formed by the inclined portion 19C. As a result, the time required for the molten resin to reach the end portion 13A of the sheet material 13 is delayed, so that the molten resin reaches the sheet material 13 and extends from the end portion 13A of the sheet material 13 to the mating surface of the sheet materials 13 with each other. Before entering the end 13A of the sheet material 13
Welds can be reliably welded to each other.

In this embodiment, when the hot plate 30 is heated, the temperature of the horizontal portion 30C of the hot plate 30 becomes the highest, and the temperature of the heat insulating portion 30B becomes lower than the temperature of the horizontal portion 30C.
The temperature of the standing wall portion 30A cooled by the cooling water flowing through the cooling pipe 31 can be further reduced as compared with the temperature of the heat insulating portion 30B, and the melting of the sheet material 13 can be prevented. As a result, the molten resin on the outer side of the container of the resin layer 15 is
At the same time as flowing toward the side (in the direction of arrow C in FIG. 1C), it is possible to prevent the sheet material 13 from being melted and mixed, and to secure high welding strength while reliably welding the sheet material end portions 13A to each other.

In this embodiment, the extension Lh of the sheet material 13 on the mating surface 19 toward the resin layer is 1 to 5 times the thickness t of the intermediate molded products 10 and 12 (t ≦ Lf ≦ Lh ≦
5t), when the welding on the resin layer side is completed,
Since the welding between the sheet materials 13 can be maintained at the mating surface between the sheet materials 13, the generation of the gap S can be prevented.

The lower jig 16 is provided with a seal 16C on the outer side of the concave portion 16B toward the upper jig 14, and the compressed resin is moved in the direction indicated by an arrow C in FIG. As shown, since a large amount flows into the inside of the container, a high welding strength can be ensured while reliably welding the sheet material ends 13A to each other by the above-described operation.

The hollow resin container 2 according to the present embodiment
FIG. 5 shows a comparison between the fuel and vapor permeation amount N1 of the fuel tank as shown in FIG. 8 and the fuel and vapor permeation amount N0 of the conventional fuel tank shown in FIG. The permeation amount N1 in the fuel tank T1 is much smaller than the permeation amount N0 in the conventional fuel tank T0 (N1 <N0). The inclined portion 19C as a gap forming means for storing the molten resin between the concave portion 19A and the convex portion 19B.
As shown in FIG. 5, the permeation amount N2 of the fuel and the vapor in the fuel tank T2 where the fuel tank T2 is not formed is smaller than the permeation amount N0 of the fuel tank T0 having the conventional structure. It becomes worse (N1 <N2 <N0).

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to such an embodiment, and various other embodiments are included within the scope of the present invention. It is clear to a person skilled in the art that is possible. For example, in the embodiment, the concave portion 19A and the convex portion 1
9B, the inclined portion 19C is formed as gap forming means for storing the molten resin.
However, the present invention is not limited to this, and as shown in FIG. 6, the groove 19D, the combined use of the inclined portion 19C and the groove 19D, or another configuration may be used.

In the above embodiment, the lower jig 16
The sealing portion 1 is provided on the outer side of the concave portion 16B toward the upper jig 14.
6C, and as shown in FIG. 1 (B), a joint 10A of the intermediate molded product 10 and a joint 1 of the intermediate molded product 12
When the upper jig 14 and the lower jig 16 are brought close to each other when welding 2A, the tip of the seal portion 16C overlaps the outer peripheral portion 14C of the upper jig 14. Instead, the shape of the lower jig 16 may be the same as that of the upper jig 14.

In the above embodiment, the hollow resin container 2
Although a fuel tank of an automobile is taken as an example as 0, the hollow resin container 20 is not limited to a fuel tank of an automobile, and may be another hollow resin container. Further, in each of the above embodiments, the hollow resin container 20 is divided into the intermediate molded products 10 and 12, but the hollow resin container may be divided into three or more intermediate molded products.

[0042]

According to the first aspect of the present invention, there is provided a hollow resin container in which the peripheral portions of a plurality of intermediate molded products having a resin layer on the outside of a sheet material are overlapped and welded to each other. Since the concave portion is formed in the mounting portion of the material and the sheet material is welded, the sheet material is less likely to be affected by the welding of the resin layers, and has an excellent effect that reliable welding suitable for the sheet materials can be performed thereafter.

According to a second aspect of the present invention, in the hollow container according to the first aspect, a gap forming means for storing the molten resin is provided and welded to a portion on the outer side of the container adjacent to the concave portion. In addition to the effects described above, there is an excellent effect that the sheet materials can be reliably welded to each other before the molten resin reaches the sheet materials and enters between the mating surfaces of the sheet materials.

According to a third aspect of the present invention, there is provided a hollow resin container in which peripheral portions of a plurality of intermediate molded products having a resin layer on the outside of a sheet material are overlapped and welded to each other. Since the welding is performed by changing the temperature of the mounting portion to the temperature of other portions on the mating surface of the intermediate molded product, there is an excellent effect that a high welding strength can be secured while reliably welding the sheet materials at the end portions.

According to a fourth aspect of the present invention, there is provided a hollow resin container in which the peripheral portions of a plurality of intermediate molded products having a resin layer on the outer side of the sheet material are overlapped and welded to each other. Since the extension to the resin layer side is welded as 1 to 5 times the thickness of the intermediate molded product, the welding of the sheet materials can be maintained at the mating surface of the sheet materials at the end of the welding of the resin layer side. This has an excellent effect that a gap can be prevented from being generated.

The present invention according to claim 5 provides the invention according to claims 1, 3,
4. In the hollow resin container according to any one of items 4,
The pressure is applied from the outside of the intermediate molded product to the mating surface and welded, so that the molten resin can flow from the outer portion of the resin layer toward the sheet material side, and the effect according to any one of claims 1, 3, and 4 can be obtained. Obtainable.

According to a sixth aspect of the present invention, there is provided a method for manufacturing a hollow resin container in which peripheral parts of a plurality of intermediate molded products having a resin layer on the outside of a sheet material are overlapped and welded. The sheet material is disposed in the concave portion formed in the mounting portion of the sheet material on the surface, extending the thickness of the intermediate material by 1 to 5 times the thickness of the intermediate molded product, and the temperature of the mounting portion of the sheet material on the mating surface of the intermediate molded product is reduced. Since the temperature of the other part of the mating surface of the intermediate molded product is changed and pressure is applied to the mating surface from the outside of the intermediate molded product and welded, high welding strength can be secured while reliably welding the sheet materials at the ends. It has an excellent effect.

[Brief description of the drawings]

1 (A) to 1 (C) are enlarged cross-sectional views showing a joining portion of a hollow resin container and an apparatus sequentially showing an intermediate molded article joining step of a method for manufacturing a hollow resin container according to an embodiment of the present invention. It is.

FIG. 2 is a cross-sectional view showing a joining portion of the hollow resin container and a jig before heating in an intermediate molded article joining step of the method for manufacturing a hollow resin container according to one embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a container manufactured by the method for manufacturing a hollow resin container according to one embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a container manufactured by the method for manufacturing a hollow resin container according to one embodiment of the present invention.

FIG. 5 is a graph showing the permeation amount of fuel and vapor in each hollow resin container.

FIG. 6 is a cross-sectional view showing a joining portion of a hollow resin container and a jig before heating in an intermediate molded article joining step of a method for manufacturing a hollow resin container according to another embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view showing a joining portion of a hollow resin container and an apparatus, showing a part of a joining step of an intermediate molded product in a method of manufacturing a hollow resin container in a conventional technique.

FIG. 8 is an enlarged cross-sectional view showing a joining portion of a hollow resin container and an apparatus, showing a part of a joining step of an intermediate molded product in a method of manufacturing a hollow resin container in another conventional technique.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 intermediate molded product 12 intermediate molded product 13 sheet material 14 upper jig 15 resin layer 16 lower jig 19 intermediate molded product mating surface 19A mating surface concave portion 19B mating surface convex portion 19C mating surface inclined portion (gap forming means) ) 19D Groove (gap forming means) on mating surface 30 Heat plate

Claims (6)

[Claims] 1. A hollow resin container in which peripheral parts of a plurality of intermediate molded products having a resin layer on the outside of a sheet material are overlapped and welded, a concave portion is provided in a mounting portion of the sheet material on a mating surface of the intermediate molded products. A hollow resin container formed and welded. 2. The hollow resin container according to claim 1, wherein a gap forming means for storing the molten resin is provided at a portion outside the container adjacent to the concave portion and is welded. 3. A hollow resin container in which peripheral parts of a plurality of intermediate molded products having a resin layer outside a sheet material are overlapped and welded, and a temperature of a mounting portion of the sheet material on a mating surface of the intermediate molded products is adjusted. A hollow resin container which is welded at a temperature different from that of another portion of the mating surface of the intermediate molded product. 4. A hollow resin container in which peripheral parts of a plurality of intermediate molded products having a resin layer on the outside of a sheet material are overlapped and welded to each other. Is extended by 1 to 5 times the thickness of the intermediate molded product.
A hollow resin container characterized by being welded as a double. 5. The hollow resin container according to claim 1, wherein a pressure is applied to the mating surface from outside the intermediate molded product during the welding. 6. A method of manufacturing a hollow resin container in which peripheral parts of a plurality of intermediate molded products having a resin layer on the outside of a sheet material are overlapped and welded, the method comprising: In the recess formed in the mounting portion, the sheet material is disposed so as to be extended by 1 to 5 times the thickness of the intermediate molded product, and the temperature of the mounting portion of the sheet material on the mating surface of the intermediate molded product is reduced by the temperature. A method of manufacturing a hollow resin container, wherein a pressure is applied from outside the intermediate molded product to the mating surface while changing the temperature of the other part of the mating surface of the intermediate molded product.