JP2023098177A - Composite container and manufacturing method thereof - Google Patents

Abstract

To provide a composite container and a manufacturing method thereof capable of preventing partial discoloration of a side wall and maintaining a good joining state between the side wall and a resin member by suppressing intrusion of moisture and oil from an end surface (cut surface) of the side wall.SOLUTION: In a composite container comprising a storage part 10 which has a bottom surface 11 and a side surface 12 and allows a top surface 13 to be opened, the storage part 10 has a paper-made side wall 30 formed in a predetermined shape and a resin-made frame 20 joined to the side wall 30. Inner surfaces 21c, 22c and 23c and outer surfaces 21d, 22d and 23d of the frame 20 are joined together in a state of sandwiching each end surface of the side wall 30 from both sides of the inside and the outside, thereby covering the end surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to a composite container and its manufacturing method.

In recent years, efforts have been made to reduce the amount of resin in disposable containers in order to reduce the burden on the natural environment caused by plastic waste such as microplastics. Specific efforts include reducing the amount of resin used in plastic containers and replacing plastic products with paper products. Furthermore, a composite container or the like in which a plastic container and a paper member are combined has been proposed.
For example, the composite containers described in Patent Documents 1 and 2 below are mainly made of paper material, and resin coating layers are laminated on both front and back sides of the composite container. The body of the container is formed, the side wall is set in the mold as an insert material, and the frame parts (flanges, pillars, etc.) other than the side wall are made of resin members to be integrally formed. there is

JP-A-1-279039 JP-A-53-83879

As described above, the side wall body forming the body and the like is formed by cutting a paper member into a predetermined shape. The paper material layer sandwiched between the two is exposed.
A slight gap is likely to be formed at the joint boundary portion between the end surface of the side wall body and the resin member. When water or oil contained in a liquid such as a beverage (for example, coffee) that is filled in the composite container enters into such a gap, the water or oil is absorbed into the paper material layer from the end surface of the side wall by capillary action. Otherwise, there is a problem that the side wall body partially discolors or deteriorates in physical properties such as soggyness as a result of oil absorption.

In order to solve the above-described problems in the prior art, the present invention suppresses the intrusion of water and oil from the end face (cut surface) of the side wall, prevents partial discoloration of the side wall, and makes the side wall and the resin made of resin. An object of the present invention is to create a composite container and a method of manufacturing the same that can maintain a good bonding state of members.

Among the means for solving the above problems, the first main means of the present invention is
A composite having a bottom surface and a side surface, and a storage section with an open top surface, wherein the storage section has a paper side wall body formed in a predetermined shape and a resin frame body joined to the side wall body a container,
The inner surface portion and the outer surface portion provided on the frame body are covered by joining the end surfaces of the side wall bodies so as to sandwich them from both the inner and outer sides.

According to the first main means of the present invention, the coating of each end surface of the side wall can be reliably achieved.
composite container.

According to another means of the present invention, in addition to the main means of the present invention, the frame body has a bottom frame body that constitutes the bottom surface, side frame bodies that constitute the side surfaces, and a top frame body that constitutes the top surface. is formed integrally with the other.

In the above-described means, by integrally constructing the frame body, the number of parts can be reduced and the manufacturing cost can be reduced.

According to another means of the present invention, in addition to the above means, the bottom frame body has bottom inner and bottom outer surface portions that cover the bottom end face of the side wall body from both sides of the inner and outer surfaces, and the side frame body has one or more side frame members. and a support inner surface portion and a support outer surface portion covering the end surfaces of the side wall bodies by sandwiching them together from both the inner and outer sides, and the ceiling frame body sandwiching the top end surfaces of the side wall bodies from both the inner and outer surfaces A means of providing a ceiling inner surface portion and a ceiling outer surface portion to be covered is added.

With the means described above, it is possible to cover not only the bottom top surface and the top surface of the side walls made of paper, but also the end surfaces of the side walls adjacent to each other in the circumferential direction.

Another means of the present invention is any one of the above means, wherein the side walls are constructed using one or a plurality of paper facepieces having a polyolefin resin layer on the surface thereof, and the framework is made of polyolefin resin. It is the addition of the means to be done.

By the means described above, it is possible to improve the bonding between the side walls and the frame body, and to achieve a composite container having side walls that are resistant to water and oil.

A second main means of the present invention is provided with an accommodating portion having a bottom surface and a side surface and an opening at the top surface, the accommodating portion comprising a side wall body made of paper formed in a predetermined shape, and the side wall body A method for manufacturing a composite container having a resin framework to be joined,
The frame body includes a bottom frame body having a bottom inner surface portion and a bottom outer surface portion covering the bottom end surface of the side wall body from both sides of the inner surface and the outer surface, and one or a plurality of the side wall bodies having the end surfaces facing each other inside and outside. A side frame body comprising a strut inner surface portion and a strut outer surface portion that are sandwiched together from both sides of the outside to cover, and a top frame including a top inner surface portion and a top outer surface portion that sandwich and cover the top end surface of the side wall body from both the inner surface and the outer surface. a body, and
an installation step of installing the side wall body made of a paper face piece as an insert material at a predetermined position in a mold for molding the frame body;
an injection step of joining the frame body and the side wall body by pouring resin into the mold from the bottom side,
The installation step includes a step of arranging the bottom end surface, the end surface of the one or more side walls, and the top end surface so as to protrude into the flow path in the mold,
In the injection step, the resin flowing in the flow path is divided into inner and outer flows by the bottom end surface, the end surface of the one or more side walls, and the top end surface. It is said.

In the second main means of the present invention, the resin flowing in the flow path is divided into the inner and outer sides, so that the bottom frame has the inner bottom surface and the bottom outer surface at the same time, and the side frame has the inner surface of the column. It is possible to achieve that the top inner surface portion and the top outer surface portion are formed at the same time in the top frame body.

In the present invention, since it is possible to suppress the infiltration of moisture and oil from the end face (cut surface) of the side wall body made of paper into the inside thereof, partial discoloration of the side wall body can be prevented. Furthermore, the joint state between the side walls made of paper and the framework made of resin can be maintained in good condition.

1 shows a composite container as an embodiment of the present invention, (a) is a plan view of the composite container, and (b) is a half sectional view taken along line bb in (a). (a) is a side sectional view at a position corresponding to the area surrounded by IIa in FIG. 1(b), and (b) is a side sectional view at a position corresponding to the area surrounded by IIb in FIG. 1(b). (a) is a side cross-sectional view at a position corresponding to the area surrounded by IIIa in FIG. 1(b), and (b) is a side cross-sectional view at a position corresponding to the area surrounded by IIIb in FIG. 1(b). FIG. 1B is a partial perspective view showing a state cut along the line IV-IV of FIG. 1(b); FIG. 4 is an exploded view showing two paper facepieces that constitute the side walls of the composite container.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1. Composite Container First, a schematic configuration of a composite container 100 shown as the present embodiment will be described with reference to FIG.
The composite container 100 has a bottom surface 11 and a side surface 12, and a housing portion 10 with an open top surface 13, as shown in FIG. 1(b). The housing portion 10 has a cup shape, and the bottom surface 11 and the top surface 13 are circular, and the top surface 13 has a larger diameter than the bottom surface 11 . The bottom surface 11 and the top surface 13 are coaxial, and the line passing through the respective centers is defined as the central axis O. As shown in FIG.

The composite container 100 is a hybrid container (also called a pillar container) in which a resin member and a paper member are integrated. More specifically, the housing portion 10 has a frame portion (hereinafter referred to as a frame body 20) made of resin members, and two half-cylindrical side wall bodies 30 made of paper are attached to the frame body 20. are spliced. Hereinafter, with respect to the frame body 20, the portion forming the frame of the side portion of the housing portion 10 is referred to as a side frame member 21, the portion forming the frame of the bottom surface 11 portion is referred to as a bottom frame member 22, and the portion forming the frame of the top surface portion is referred to as a side frame member 21. A constituent portion is referred to as a ceiling frame body 23 .

The bottom frame body 22 includes a bottom frame body 22a forming an outer edge portion of the bottom surface 11 of the housing portion 10, and a bottom wall portion 22b forming the bottom surface 11. As shown in FIG. The bottom frame body 22a is configured as an annular frame having an L-shaped cross section. The bottom wall portion 22b has a disc shape centered on the central axis O, and constitutes a bottom surface 11 integrally connected to the inner peripheral surface of the bottom wall portion 22b.
As shown in FIGS. 2A and 2B, the bottom frame 22a has a bottom inner surface portion 22c joined to the inner surface side of the bottom end surface 31c portion of the side wall 30 and a bottom outer surface portion 22d joined to the outer surface side. The bottom inner surface portion 22c and the bottom outer surface portion 22d cover the bottom end surface 31c portion of the side wall body 30 by joining them from both sides of the inner surface and the outer surface.

The top frame body 23 includes a top frame body 23a forming an outer edge portion of the top surface 13 of the housing portion 10, and a flange portion 23b protruding radially outward from the top frame body 23a. The top frame body 23a is configured in a ring frame shape having a predetermined length in the height direction. A flange portion 23b is connected to the top end of the top frame body 23a. As shown in FIGS. 3A and 3B, the top frame body 23a has a top inner surface portion 23c that is joined to the inner surface side of the top end surface 31d portion of the side wall 30, and a top inner surface portion 23c that is joined to the outer surface side of the top end surface 31d portion. The top inner surface portion 23c and the top outer surface portion 23d cover the top end surface 31d of the side wall body 30 by joining them from both sides of the inner surface and the outer surface.

The side frame body 21 has a lower end connected to the bottom frame body 22 and an upper end connected to the top frame body 23, and includes two strut portions 21a extending in the height direction. These two pillars 21a are arranged at positions that are axially symmetrical with respect to the central axis O. As shown in FIG. As shown in FIG. 4, of the two side wall bodies 30, the support column 21a joins one end face 31a of one side wall body 30A and the other end face 31b of the other side wall body 30B from the inner side. and a support outer surface portion 21d joined from the outer surface side. 31b) are covered by joining them so as to sandwich them together from both sides of the inner surface and the outer surface.

In this embodiment, the side wall bodies 30A and 30B that constitute the two side wall bodies 30 are obtained by cutting and curving the two fan-shaped paper face bodies 31 shown in FIG. As shown in FIG. 4, one end face 31a of one side wall body 30A and the other end face 31b of the other side wall body 30B are joined to face each other with a predetermined gap, thereby forming a cylindrical shape. It is a thing. The end faces of these two side wall bodies 30 are respectively joined between two support pillars 21a that are axially symmetrically arranged and constitute the side frame body 21. As shown in FIG.

In the composite container 100 of the present invention, the type of resin constituting the framework 20 is not particularly limited, but polypropylene (homopolymer, block copolymer, random copolymer) and polyethylene used as packaging container materials General-purpose resins such as (high-density polyethylene, low-density polyethylene, etc.) and polyethylene terephthalate resin can be widely used. In particular, olefin resins such as polypropylene and polyethylene are more preferable in terms of adopting the production method described below.

The paper face piece 31 constituting the side wall 30 may be formed thinly and flatly by agglutinating plant fibers or other fibers, and may be so-called synthetic paper or laminated paper/composite paper in which various plastics are laminated. Functional paper imparted with functions such as water resistance and oil resistance may also be used. The basis weight of the paper used can be designed appropriately. For example, paper having a basis weight of 100 g/m ² or more and 600 g/m ² or less, preferably 250 g/m ² or more and 400 g/m ² or less can be used. In particular, in adopting the production method described later, it is more preferable to use a laminated paper that is imparted with functions such as water resistance and oil resistance by laminating an olefin resin layer such as polyethylene resin on the surface layer.

2. Method for Manufacturing Composite Container Next, a method for manufacturing the composite container 100 will be described with reference to FIGS. It should be noted that a mold is omitted in FIGS.
So-called insert molding can be employed when manufacturing the composite container 100 . A mold suitable for the frame body 20 and two side wall bodies 30 previously cut into a predetermined shape (fan shape) are prepared. Then, the two side wall bodies 30 are installed at predetermined positions in the mold as insert members (installation step). At this time, each end face of the side wall body 30, that is, the bottom end face 31c portion, the top end face 31d portion, one end face 31a and the other end face 31b of the side wall body 30 were separated so as not to come into contact with the inner peripheral face of the mold. The resin is poured into the frame body 20 from the bottom side (injection step). The mold is configured so that the resin is poured through a gate provided at the center position of the lower surface side of the bottom wall portion 22b of the bottom frame body 22. As shown in FIG.

As described above, the bottom frame body 22, the side frame bodies 21 and the top frame body 23 are connected to each other. Therefore, the resin R poured into the mold from a gate provided at a position corresponding to the center position of the bottom wall portion 22b flows so as to spread radially outward through the bottom wall portion 22b, and is provided on the outer peripheral side. Through the bottom frame body 22a of the bottom frame body 22, it flows through the side frame body 21 and the top frame body 23 in this order.

In the injection process, in the bottom frame body 22a of the bottom frame body 22, as shown in FIGS. , one flows on the inner surface side and the other flows on the outer surface side, so that the bottom inner surface portion 22c and the bottom outer surface portion 22d are formed at the same time to join the bottom end surface 31c portion of the side wall body 30 from both sides of the inner surface and the outer surface. be.

The resin R then flows from the bottom frame 22a to the top frame 23 through the flow path forming the support 21a (the support inner surface 21c and the support outer surface 21d) that constitute the side frame 21. FIG. At this time, as shown in FIG. 4, one (the inner flow indicated by the broken line) of the resin R split into two directions at the bottom end face 31c flows inside the column portion 21a, and the other (the outer flow indicated by the solid line) flows inside the support 21a. ) flows on the outside of the column portion 21a. Therefore, the one end surface 31a of one side wall body 30A and the other end surface 31b of the other side wall body 30B are joined together from both sides of the inner surface and the outer surface by the resin R flowing inside and outside the support 21a. The column inner surface portion 21c and the column outer surface portion 21d are formed at the same time.

Furthermore, in the top end surface 31d portion of the side wall body 30, the resin R that flows while forming the support inner surface portion 21c and the support outer surface portion 21d joins once near the upper end of the support portion 21a passing above the top end surface 31d portion. , but then splits into two in the circumferential direction to form the top frame body 23a and the flange portion 23b. The resin R forming the top frame body 23a is circumferentially moved along the inner side by one end face 31a of one side wall body 30A and the other end face 31b of the other side wall body 30B projecting into the flow path in the mold. The resin R is divided into two resins, one that flows along the outer surface and the other that flows along the outer circumferential direction. The top inner surface portion 23c and the top outer surface portion 23d are simultaneously formed by joining so as to be sandwiched from each other.

At this time, a polyolefin resin such as polypropylene is used as a filling resin material, and a polyolefin resin layer such as a polyethylene layer is formed on at least the surface of the paper face piece 31 constituting the side wall 30 on the side to be joined to the frame body 20 . By using the laminated paper, the frame body 20 and the paper face piece 31 are heat-sealed during the insert molding, and the frame body 20 and the paper face piece 31 are joined without using an adhesive or the like. be able to.

According to the composite container 100 described above, the bottom end surface 31c of the side wall 30 is sandwiched between the bottom inner surface 22c and the bottom outer surface 22d and joined, and the top end surface 31d of the side wall 30 is the top inner surface. 23c and the top outer surface portion 23d, and both end surfaces (one end surface 31a and the other end surface 31b) of the two side wall bodies 30 are formed by the support inner surface portion 21c and the support outer surface portion 21d. And it is the structure which joins so that it may pinch together from both sides of an outer surface. That is, each end face portion of the side wall body 30, that is, the bottom end face portion 31c portion, the top end face portion 31d portion of the side wall body 30, and the one end face portion 31a and the other end face portion 31b, which are both end face portions, have the bottom inner face portion 22c and the other end face portion 31b. Each resin forming the bottom outer surface portion 22d, the top inner surface portion 23c, the top outer surface portion 23d, and the support inner surface portion 21c and the support outer surface portion 21d sandwiches and coats them from both sides of the inner surface and the outer surface. .

Therefore, for example, the paper materials laminated inside the paper face piece 31 constituting the two side wall bodies 30 (side wall body 30A and side wall body 30B) are exposed from each end surface (cut surface) after cutting. Even in such a case, each resin R sandwiching them covers them and blocks them from the outside. Therefore, even if water or oil contained in a liquid such as a beverage (for example, coffee) filled in the composite container 100 adheres to the joint boundary portion between each end surface of the side wall 30 and each resin, the bottom inner surface portion 22c The resins forming the bottom outer surface portion 22d, the top inner surface portion 23c, the top outer surface portion 23d, and the column inner surface portion 21c and the column outer surface portion 21d cover the respective end surfaces to prevent water and oil from entering. As a result, in the composite container 100 of the present invention, it is possible to prevent the sidewall body 30 from partially discoloring or deteriorating in physical properties such as softening.

Further, in the above composite container 100, while the storage portion 10 is mainly composed of the side walls 30 made of paper in a semi-cylindrical shape, the strength of the side walls 30 can be supplemented by making the framework 20 made of resin. be. Therefore, the amount of resin to be used can be greatly reduced compared to the case where the entire housing portion 10 is made of resin. Furthermore, the frame body 20 may have a thickness sufficient to compensate for the insufficient strength of the side walls 30 made of paper alone, so the amount of resin required for the frame body 20 can be reduced.

Further, in the composite container 100, the ceiling frame body 23 is joined to the top end surface 31d of the side wall body 30. As shown in FIG. Force is likely to be applied to the outer edge portion of the top surface 13 when contents are taken in and out of the container 10 . In the composite container 100, the top end surface 31d of the side wall body 30 is joined to the top inner surface portion 23c and the top outer surface portion 23d of the top frame body 23a so as to be sandwiched from both sides of the inner and outer surfaces. It is possible to prevent them from coming off, and to maintain a good bonding state between them.

Further, if the composite container 100 is manufactured by the insert molding method as described above, the paper face piece 31 constituting the side wall 30 is set at a predetermined position as an insert material in the mold for manufacturing the framework 20. By filling resin, the top frame body 23 is joined to the top end face 31d of the side wall body 30, the bottom frame body 22 is joined to the bottom end face 31c part, and the gap between one end face 31a and the other end face 31b is formed. A composite container 100 can be manufactured in which the side frame bodies 21 are respectively joined to the sides.

Moreover, in the manufacturing method of the composite container 100, the bottom inner surface portion 22c and the bottom outer surface portion 22d joining the respective end surfaces of the side walls 30 from both the inner surface and the outer surface, the column inner surface portion 21c and the column outer surface portion 21d, and the top inner surface portion Since the 23c and the top outer surface portion 23d can be formed at the same time, the work of joining them separately becomes unnecessary, and the manufacturing efficiency can be improved. In addition, it is possible to reduce the difference between the inside and outside of the joint boundary between each end face of the side wall 30 and the resin (difference in the degree of joint between the joint boundary on the inner surface and the joint boundary on the outer surface). and oil can be more effectively prevented from entering the side wall body 30

Therefore, according to the composite container 100 and the manufacturing method of the composite container 100 of the above-described embodiment, by combining the frame body 20 made of resin and the sidewall body 30 made of paper, the amount of resin can be reduced and the manufacturing efficiency can be improved. In addition, the joint state at the bottom end surface 31c portion, the top end surface 31d portion, and the one end surface 31a and the other end surface 31b portion of the frame body 20 made of resin and the side wall body 30 made of paper can be maintained well.

The composite container 100 and the method for manufacturing the composite container 100 described above are merely one aspect of the composite container and the method for manufacturing the composite container according to the present invention, and the present invention is not limited to the above embodiments. Changes can be made as appropriate without departing from the gist of the invention.

For example, in the above-described embodiment, the side frame body 21 is composed of two pillars 21a arranged axially symmetrically, but the number of the pillars 21a may be one, or three or more. Moreover, although the side wall body 30 is composed of two sheets, the side wall body 30 may have a structure in which one sheet of the paper face piece 31 is rolled up and one end face 31a and the other end face 31b are joined by the strut portion 21a. , the end faces of a plurality of side wall bodies 30 of three or more sheets may be joined together by a plurality of supporting columns 21a.

Further, in the above-described embodiment, one end surface 31a and the other end surface 31b of the two side wall bodies 30 are connected by two supporting columns 21a. Any configuration may be employed as long as it is joined at the portion 21a. In this case, the strength is inferior because there is no additional support 21a. It is possible to solve the strength problem by connecting. Incidentally, the simple column portion may be provided on the inner side of the side wall body 30 or may be provided on the outer side.

Further, in the above-described embodiment, an example in which the bottom surface 11 and the top surface 13 of the housing portion 10 are formed in a circular cup shape was shown, but the specific shape of the housing portion 10 is not particularly limited. . For example, it may be formed in the shape of a deep plate, a bottle, or the like, and the shapes of the bottom surface 11 and the top surface 13 are not limited to circular, and may be square, rectangular, or polygonal. good

Furthermore, in the above embodiment, the case where the entire surface of the bottom surface 11 of the bottom frame body 22 is composed of the bottom wall portion 22b made of resin has been described, but the shape of the bottom frame body 22 is not particularly limited. Alternatively, the bottom frame 22 and a circular paper face piece may be used to form the bottom face 11 . In this case, it is preferable that the resin forming the bottom frame 22 joins the peripheral edge of the circular paper face piece forming the bottom surface 11 from both the upper and lower surfaces.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to expand applications in the field of composite containers composed of side walls made of paper and frame members made of resin.

10: Receiving portion 11: Bottom surface 12: Side surface 13: Top surface 20: Frame body 21: Side frame body 21a: Support column 21c: Column inner surface (inner surface)
21d: strut outer surface (outer surface)
22: Bottom frame body 22a: Bottom frame body 22b: Bottom wall part 22c: Bottom inner surface part (inner surface part)
22d: Bottom outer surface part (outer surface part)
23: Top frame body 23a: Top frame body 23b: Flange portion 23c: Top inner surface portion (inner surface portion)
23d: top outer surface part (outer surface part)
30 : Side wall 31 : Paper face piece 31a : One end face 31b : Other end face 31c : Bottom end face 31d : Top end face 100 : Composite container O : Center axis R : Resin

Claims (6)

A housing portion (10) having a bottom surface (11) and a side surface (12) and a top surface (13) opening is provided, and the housing portion (10) is a paper side wall body ( 30) and a resin framework (20) joined to the side wall (30), comprising:
The inner surface portions (21c, 22c, 23c) and the outer surface portions (21d, 22d, 23d) provided in the framework (20) sandwich the end surfaces of the side wall (30) from both the inner and outer sides. A composite container characterized by being covered by bonding. The frame body (20) includes a bottom frame body (22) forming a bottom surface (11), a side frame body (21) forming a side surface (12), and a top frame body (23) forming a top surface (13). ) and integrally formed composite container according to claim 1. The bottom frame body (22) has a bottom inner surface part (22c) and a bottom outer surface part (22d) covering the bottom end surface (31c) of the side wall body (30) from both sides of the inner surface and the outer surface. ) comprises one or more of the side wall bodies (30) end surfaces (31a, 31b) sandwiched together from both the inner and outer sides to cover the support inner surface part (21c) and the support outer surface part (21d), 3. The composite container according to claim 2, wherein the top frame (23) comprises a top inner surface portion (23c) and a top outer surface portion (23d) that sandwich and cover the top end surface (31d) of the side wall body (30) from both the inner surface and the outer surface. . 3. The side walls (30) are constructed using one or a plurality of paper face pieces (31) having a polyolefin resin layer on the surface thereof, and the frame body (20) is constructed of polyolefin resin. The composite container according to any one of 1. A housing portion (10) having a bottom surface (11) and a side surface (12) and a top surface (13) opening is provided, and the housing portion (10) is a paper side wall body ( 30), and a method for manufacturing a composite container having a resin frame body (20) joined to the side wall body (30),
The framework body (20) includes a bottom inner surface part (22c) and a bottom outer surface part (22d) covering the bottom end surface (31c) of the side wall body (30) from both the inner surface and the outer surface. 22), and a strut inner surface portion (21c) and a strut outer surface portion (21d) covering the end faces (31a, 31b) of one or more of the side wall bodies (30) from both the inner and outer sides by sandwiching them together. A top frame body (23) comprising a side frame body (21), and a top inner surface portion (23c) and a top outer surface portion (23d) covering the top end surface (31d) of the side wall body (30) from both sides of the inner surface and the outer surface. ), and
an installation step of installing the side wall body (30) made of a paper face piece (31) as an insert material in a predetermined position in a mold for molding the frame body (20);
an injection step of joining the frame body (20) and the side wall body (30) by pouring resin into the mold from the bottom surface (11) side;
In the installation step, the bottom end surface (31c), the end surfaces (31a, 31b) of the one or more side walls (30), and the top end surface (31d) protrude into the flow path inside the mold. including the step of arranging such that
In the injection step, the resin (R) flowing through the flow path is injected into the bottom end surface (31c), the end surfaces (31a, 31b) of the one or more sidewall bodies (30), and the top end surface (31d). A method for manufacturing a composite container, characterized in that the flow is divided into the inside and the outside by the. 6. The method of manufacturing a composite container according to claim 5, wherein the resin (R) flows through the bottom frame body (22), the side frame body (21) and the top frame body (23) in this order.

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