JP2023081214A - Composite container and manufacturing method of composite container - Google Patents

Abstract

To provide a composite container and a manufacturing method of the same, which can significantly reduce the amount of resin and improve manufacturing efficiency by combining a skeleton body made of resin and a cylindrical body made of paper, and maintain a function required of a paper cylindrical body.SOLUTION: A composite container 100 includes a storage part 10 having a bottom surface 11 and a side surface 12 and configured by using a resin skeleton body 20 and a paper cylindrical body 30. The cylindrical body 30 is made of one or a plurality of paper face bodies 31 formed into a cylindrical shape. The skeleton body 20 has a joint part 21a interposed between one edge part 31a and the other edge part 31b of the paper face body 31 and covering an entire end face of the paper face body 31 at one end side part 31a and the other end side part 31b.SELECTED DRAWING: Figure 1

Description

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

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, Patent Document 1 proposes a composite container in which a resin container and a paper sleeve (reinforcing member) are combined. In the composite container, the amount of resin is reduced by providing a thin portion having a thickness of 0.01 mm or more and 0.09 mm or less in the body of the resin container. However, if such a thin-walled portion is provided in the barrel, the barrel is easily deformed and cannot be gripped. Therefore, the resin container is provided with a flange portion connected to the body portion, a thick portion connected to the flange portion at the body portion, and a projecting portion projecting radially outward from the thick portion. The thin portion is arranged closer to the bottom than the thick portion. By inserting the body of the resin container into the cylindrical sleeve made of paper and supporting the sleeve on the protruding portion, the resin container and the paper sleeve can be easily attached, and The sleeve reinforces the rigidity of the resinous container, which is reduced by the thin-walled portion.

JP 2021-116122 A

According to the composite container disclosed in Patent Document 1, the amount of resin in the body is reduced by obtaining rigidity from the paper sleeve. However, the upper portion of the body portion is provided with a thick portion, and the bottom portion is also made thicker than the thin portion in order to maintain a predetermined strength. Therefore, there are still many parts made of resin, and further reduction of the amount of resin used is required.

Furthermore, in the composite container, it is necessary to separately prepare the resin container and the paper sleeve, and then attach the paper sleeve to the resin container. The resin container is made by blow-molding a preform, and the paper sleeve is made by rolling a paperboard or the like that has been cut into a predetermined shape, including the main body and the glue margin, and joining the main body and the glue. It is produced by adhering the margin portion with an adhesive or the like. As described above, the manufacturing process of the conventional composite container is complicated, and an improvement in manufacturing efficiency is required.

In addition, for the paper sleeve, laminated paper or the like having a functional film having a function such as water resistance laminated on the surface thereof is used. The composite container as described above accommodates contents including water such as food. Since the cut surface of the paper sleeve is not covered with the functional film, water or the like may enter through the cut surface and cause the paper sleeve to swell due to the water or the like. In that case, it may become impossible to maintain the rigidity required for the paper sleeve. In addition, if the cut surface is exposed, for example, the functional film on the surface will peel off from the edge, and the laminated structure cannot be maintained, and the rigidity and appearance required for the paper sleeve cannot be maintained. Sometimes you can't.

Therefore, an object of the present invention is to significantly reduce the amount of resin and improve manufacturing efficiency by combining a resin framework and a paper tubular body, which is required for paper tubular bodies. The object of the present invention is to provide a composite container and a method for manufacturing the same, which can maintain the function of

In order to solve the above-mentioned problems, a composite container according to the present invention has a bottom surface and a side surface, and has a storage part configured by using a resin framework and a paper tubular body, The tubular paper body is one or a plurality of paper facepieces formed into a tubular shape, and the frame body is interposed between one edge portion and the other edge portion of the paper facepiece. Further, it has a joint portion covering the entire end surface of the one edge portion and the other edge portion.

In the composite container described above, it is preferable that the one edge portion and the other edge portion are bent to protrude from the outer surface of the cylindrical body and are embedded in the joint portion.

In the above-described composite container, the frame body includes a bottom frame body forming an outer edge of the bottom surface, a top frame body forming an outer edge of the top surface of the container, and the joint portion. a side frame body connected to a top frame body, and the one end side portion and the other end side portion of the side surface of the accommodating portion are joined to the side frame body and the joint portion; The bottom surface of the accommodating portion is composed of the bottom frame body and a bottom paper face body having an outer edge portion joined to the bottom frame body, and It is preferable that the bottom side portion of the paper cylindrical body is joined to the bottom frame body, and the top side portion is joined to the top frame body.

In order to solve the above-described problems, a method for manufacturing a composite container according to the present invention is a method for manufacturing the above-described composite container, comprising: one mold member divided via a dividing surface; a mold member having a mold member and combining the one mold member and the other mold member to form a resin-filled portion having a shape corresponding to the frame body; in the above one mold member and the other mold member so that the edge portion of the paper face piece is inserted into the joint forming region having a shape corresponding to the joint portion; The one end side portion and the other end side portion of the paper face piece are joined by the joining portion by placing between and sandwiched between the two mold members and filling the resin filling portion with resin. It is characterized by obtaining the composite container in which the frame body and the tubular body are integrated by joining.

In the method for manufacturing a composite container according to the present invention, a convex portion projecting from the dividing surface of the one mold member toward the other mold member is provided in the joint forming region, and the convex portion It is preferable that the resin filling portion is filled with the resin while the edge portion of the paper face piece is pushed up toward the other mold member.

In the method for manufacturing a composite container according to the present invention, a concave portion is provided in the vicinity of the convex portion on the dividing surface of the one mold member at a position where the edge portion is arranged in the joint forming region. The convex portion and the concave portion are arranged in this order from the end surface side of the edge portion. Preferably the sides are folded.

According to the composite container according to the present invention, by configuring the storage section using the resin frame body and the paper tubular body, compared to the case where the entire storage section is made of resin, the resin used amount can be greatly reduced. Furthermore, since the framework may be made thick enough to compensate for the strength that is lacking in the paper cylindrical body, the amount of resin required for the framework can be reduced.

Here, the paper tubular body is one or a plurality of paper facepieces formed into a tube shape, and between one edge portion and the other edge portion of the paper facepiece, a frame body is provided. A joint portion is interposed, and the joint portion covers the entire end surface of each edge portion and is joined. When the composite container is applied to a content containing water such as food or a container for containing liquid, water may adhere to the joints of the paper face piece. Even in such a case, in the present invention, since the entire end faces of one edge portion and the other edge portion are covered, it is possible to prevent moisture or the like from entering the joint portion from the end faces. Therefore, even if the end face of the paper face piece is a cut surface, moisture or the like enters from the end face and the rigidity is lowered, or if the paper face piece is made of laminated paper in which a plurality of sheets are laminated, the laminated sheets may be cut. It is possible to suppress problems such as peeling off from the surface and reduction in bonding strength between the edge portions. For these reasons, the rigidity required for the paper tubular body and the appearance of the composite container can be maintained satisfactorily, and the functions required for the paper tubular body can be maintained.

Furthermore, according to the method of manufacturing a composite container according to the present invention, an insert molding method can be applied. That is, when the paper face piece is placed in a predetermined position in the mold and filled with resin in the resin-filled portion of the mold, the edges of the paper face piece are inserted into the joint forming region, so that the framework is formed. At the same time when the body is molded, a composite container can be obtained in which one edge and the other edge of the paper-made face piece are joined together by the joining portion. Therefore, the work of separately manufacturing and assembling the resin-made portion and the paper-made portion becomes unnecessary, and the manufacturing efficiency can be improved.

As described above, according to the composite container and the method for manufacturing a composite container according to the present invention, it is possible to reduce the amount of resin and improve the manufacturing efficiency by combining a resin framework and a paper cylindrical body, and , it is possible to maintain the functions required for the paper tubular body.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating the composite container of embodiment of this invention, (a) is a front view (partial cross-sectional view) of the said composite container, (b) is a bottom view of the said composite container. It is a figure showing the composite container shown in FIG. 1, (a) is a top view, (b) is a side view (partial cross section). 1. It is a figure which shows the paper-made face piece which comprises the cylindrical body of the composite container shown in FIG. 1, (a) shows the side paper-made face piece which comprises the side surface of an accommodating part, (b) comprises the bottom face of an accommodating part. 1 shows a bottom paper facepiece that Regarding the composite container shown in FIG. 1, (a) is a cross-sectional view taken along line AA in FIG. 1 (a), and (b) is a schematic diagram showing the side cross-sectional structure of the mold used to mold the part. and (c) is a schematic diagram for explaining the molding method. FIG. 4A is a view corresponding to FIG. 4A in the comparative example, and FIG. It is a schematic diagram showing a cross-sectional structure, and (c) is a schematic diagram for demonstrating a shaping|molding method. FIG. 4A is a diagram for explaining a modification of the composite container of the embodiment of the present invention, where (a) is a diagram corresponding to FIG. It is a schematic diagram showing the side cross-sectional structure of the metal mold|die used for this, (c) is a schematic diagram for demonstrating a molding method.

A composite container and a method for manufacturing a composite container according to embodiments of the present invention will be described below with reference to the drawings.

1. Composite Container First, a schematic configuration of a composite container 100 of the present embodiment will be described with reference to FIGS. 1 to 3. FIG. 1(a) is a front view (partial cross-sectional view) of the composite container 100, FIG. 1(b) is a bottom view, FIG. 2(a) is a top view, and FIG. ) is a side view (partial cross-sectional view). Note that the hatched portion in FIG. 2(a) indicates an annular convex rib 23f, which will be described later, and does not indicate a cross section.

The composite container 100 has a bottom surface 11 and side surfaces 12, and a housing portion 10 with an open top surface 13, as shown in FIG. 1(a). The composite container 100 is a hybrid container made of different materials, in which the housing part 10 is composed of a frame body 20 made of resin and a tubular body 30 made of paper. As shown in FIGS. 1(b) and 2(a), the housing portion 10 is configured in a cup shape, the bottom surface 11 and the top surface 13 are coaxial circles, and the top surface 13 is the bottom surface 11. It has a larger diameter than

The tubular body 30 made of paper is formed by joining the side paper face piece 31 and the bottom paper face piece 32 shown in FIG. Hereinafter, a line passing through the centers of the bottom surface 11 and the top surface 13 is defined as a central axis O, a direction along the central axis O is referred to as an axial direction, and a direction orthogonal to the central axis O is referred to as a radial direction. The direction of rotation is called the circumferential direction. In addition, in the axial direction when the composite container 100 is placed in the state shown in FIG. 1, the bottom surface 11 side is referred to as the "lower" side, and the top surface 13 side is referred to as the "upper" side. In addition, in FIG.1(a) and FIG.2(a), the right side of the center axis line O is each made into sectional drawing. The configurations of the frame body 20 and the cylindrical body 30 will be described in order below.

As shown in FIGS. 1(a), (b) and FIGS. 2(a), (b), the frame body 20 includes a side frame body 21 forming a frame of the side portion of the housing portion 10 and a frame of a bottom portion. and a top frame 23 forming the frame of the top surface portion.

As shown in FIGS. 1(a) and 1(b), the side frame body 21 is composed of two struts 21a and 21b, one end of which is connected to the bottom frame body 22 and the other end of which is connected to the top frame body 23. Configured. The two supporting columns 21a and 21b are arranged to face each other with the central axis O interposed therebetween. The joining strut portion 21a and the reinforcing strut portion 21b protrude radially outward from the outer surface of the tubular body 30, that is, the outer surface of the side paper-made face piece 31, and extend from the bottom frame body 22 to the top frame body 23 along the axial direction. It is provided as a convex rib.

One of the two strut portions 21a and 21b corresponds to the joint portion according to the present invention. The other supporting column portion 21b functions as a reinforcing portion for supplementing the strength (rigidity) of the housing portion 10. As shown in FIG. Hereinafter, one of the strut portions 21a will be referred to as a joint strut portion 21a, and the other strut portion 21b will be referred to as a reinforcing strut portion 21b. One end side portion 31a and the other end side portion 31b of the side paper face piece 31 constituting the cylindrical body 30 are joined at the joining support portion 21a. In addition, the reinforcing strut portion 21b is joined (adhered) to the outer surface of the cylindrical body 30 (the side paper face piece 31).

The bottom frame body 22 constitutes the outer edge of the bottom surface 11 of the housing portion 10 . The bottom frame body 22 includes a bottom annular frame 22a arranged on the bottom surface 11 side and a side annular frame 22b arranged on the side surface 12 side, as shown in FIGS. The bottom annular frame 22a has a flat annular shape with a thin thickness in the axial direction. The side annular frame 22b is thin in the radial direction and has a ring frame shape having a predetermined length in the axial direction. The bottom frame body 22 has a substantially L-shaped cross section by connecting the outer edge of the bottom annular frame 22a and the lower end of the side annular frame 22b with a bottom bone joint 22c (see FIG. 1(a)). .

Also, the bottom frame body 22 is connected to the joint strut part 21a and the reinforcing strut part 21b of the side frame body 21 by the connecting part 22d. As shown in FIGS. 1(a) and 1(b), the connecting portion 22d is provided from the bottom surface 11 side of the housing portion 10 to the side surface 12 side of the bottom bone joint portion 22c. is integrated with Further, as shown in FIGS. 1 and 2, the outer edge of the bottom paper face piece 32 is joined to the inner edge portion of the bottom annular frame 22a from the inner surface side of the bottom annular frame 22a, and the upper end portion of the side annular frame 22b. The bottom edge portion 31c of the side paper face piece 31 is joined from the outer surface side of the side annular frame 22b.

The top frame 23 constitutes the outer edge of the top surface 13 of the housing portion 10 . As shown in FIGS. 1(a) and 2(b), the top frame 23 includes an inner frame 23a joined to the top edge portion 31d of the side paper face piece 31, and the upper end of the inner frame 23a. It has a flange portion 23b that protrudes outward, and an outer frame body 23c that extends vertically from the outer edge of the flange portion 23b. Each of the inner frame body 23a and the outer frame body 23c has a predetermined length in the axial direction and is configured in a ring frame shape with a thin thickness in the radial direction. That is, the ceiling frame 23 has a U-shaped cross-sectional shape with an open bottom due to the inner frame 23a, the flange portion 23b, and the outer frame 23c. In the composite container 100 of the present embodiment, the top frame body 23 is configured to have a U-shaped cross section, thereby thinning the thickness of the inner frame body 23a, the flange portion 23b, and the outer frame body 23c. Even if the amount of resin is reduced, it is easy to maintain the necessary strength.

In this embodiment, as shown in FIGS. 1(a) and 1(b), an inner peripheral rib 23d extends in the circumferential direction along the inner peripheral surface at the lower end of the inner peripheral surface of the outer frame body 23c. They are provided at four locations at equal intervals. The inner peripheral rib 23d protrudes radially inward from the inner peripheral surface of the outer frame 23c and has a predetermined width in the peripheral direction. By providing the inner peripheral rib 23d on the inner peripheral surface of the outer frame body 23c, the strength of the top frame body 23 can be increased. In addition, an outer peripheral rib 23e is provided over the entire circumference at the lower end portion of the outer peripheral surface of the outer frame body 23c so as to protrude radially outward. By providing these inner peripheral ribs 23d and outer peripheral ribs 23e, even when the thicknesses of the inner frame body 23a, the flange part 23b and the outer frame body 23c are reduced, the strength required for the top surface 13 of the housing part 10 is achieved. can be better maintained.

Further, in the present embodiment, as shown in FIGS. 1(a), 2(a) and 2(b), the top surface 13 of the flange portion 23b is provided with an annular convex rib 23f projecting upward in the axial direction. ing. The annular convex rib 23f is used as a contact ring for a packing seal. In addition, when the composite container 100 is used as a refill container (refill), the annular convex rib 23f is used to fit into an undercut provided at a joining portion for joining the composite container 100. can also

Next, the joint state between the frame body 20 and the cylindrical body 30 (paper face pieces (31, 32)) will be described. In this embodiment, the cylindrical body 30 is formed by rounding a side paper face piece (paper face piece) 31 cut into a predetermined shape such as a fan shape shown in FIG. is joined to the end side portion 31b of the tube by the joint support portion 21a to form a cylindrical shape. Further, the bottom paper face piece 32 exhibits a shape (circular in the present embodiment) corresponding to the shape of the bottom surface of the storage section 10 .

First, a description will be given of the joint state between the both end side portions 31a and 31b of the side paper face piece 31 and the joint support portion 21a. FIG. 4(a) is a view showing the joining state of the portion, and is a cross-sectional view taken along line AA in FIG. 1(a). As shown in FIG. 4(a), the joint support 21a is interposed between one end side 31a and the other end side 31b of the side paper face piece 31 and joins them. In the present embodiment, one end side portion 31a and the other end side portion 31b are embedded in the joint support portion 21a in a bent state so as to protrude radially outward from the outer surface of the cylindrical body 30. there is By joining the two in this way, the inner and outer surfaces of the edges 31a and 31b of the side paper face piece 31 can also be covered with resin, and the entire end face of the side paper face piece 31 can be completely covered with resin. can be coated on

In this embodiment, as shown in FIG. 4(a), one edge portion 31a and the other edge portion 31b of the side paper face piece 31 have mountain folds when viewed from the outer surface side of the composite container 100, respectively. A first bent portion 31e having a shape and a second bent portion 31f having a valley-like shape are provided. In the side paper face piece 31, the first bent portion 31e is arranged inside the second bent portion 31f with respect to the end faces of the end sides 31a and 31b. The first bent portion 31e and the second bent portion 31f are provided substantially parallel to each other at a predetermined distance from the end face (end side) of each of the end side portions 31a and 31b. By providing the first bent portion 31e and the second bent portion 31f, the edge portions 31a and 31b of the side paper face member 31 protrude radially outward from the outer surface of the tubular body 30 as described above. It is in a state of being bent so as to

Further, in the present embodiment, when the side paper face piece 31 is unfolded (see FIG. 3A), at a substantially intermediate position between one edge portion 31a and the other edge portion 31b in the width direction (peripheral direction) , the reinforcing strut portion 21b is joined to the outer surface of the side paper face piece 31. As shown in FIG.

As shown in FIG. 1(b), the bottom edge portion 31c of the side paper face piece 31 is joined to the upper end portion of the side annular frame 22b of the bottom frame body 22. As shown in FIG. Also, the top edge portion 31 d of the side paper-made face piece 31 is joined to the lower end portion of the inner frame body 23 a of the top frame body 23 . Here, in the present embodiment, the four corners of the side paper face piece 31 are so-called rounded corners. In the present embodiment, unlike the one edge portion 31a and the other edge portion 31b, the bottom edge portion 31c and the top edge portion 31d of the side paper face piece 31 are not bent, and are not bent. 22 and the top frame body 23 . If the four corners of the side paper-made face piece 31 have corners, when the outer surface side of the side paper-made face piece 31 is joined to the inner surface of the side annular frame 22b of the bottom frame 22 and the inner frame 23a of the top frame 23 In addition, it may peel off from the corners. In the present embodiment, by rounding the four corners, even when the side paper face piece 31 is joined to the frame body 20 on only one side, the corner portions are less likely to come off.

Further, the inner edge portion of the bottom annular frame 22a of the bottom frame body 22 is joined to the outer edge portion of the circular bottom paper-made face piece 32 shown in FIG. 3(b). The bottom frame body 22 and the top frame body 23 are joined to the outer surface side of the side paper face piece 31 respectively. Also, the bottom frame body 22 is joined to the outer surface side of the bottom paper face piece 32 .

In the composite container 100, the type of resin constituting the framework 20 is not particularly limited, but polypropylene (homopolymer, block copolymer, random copolymer), polyethylene (high 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 facepieces (31, 32) constituting the cylindrical body 30 may be formed by agglutinating plant fibers or other fibers into a thin and flat shape, and may be made of so-called synthetic paper, gravure paper, various plastics, or the like. Laminated paper or composite paper obtained by laminating a plurality of sheets may be used, or functional paper imparted with functions such as water resistance and oil resistance may be used. The basis weight of the paper used can be designed appropriately. In particular, in adopting the manufacturing method described later, it is a laminated paper that has been given functions such as water resistance and oil resistance by laminating an olefin resin sheet such as polyethylene resin, polyethylene terephthalate resin sheet, etc. on the surface layer. is more preferred.

2. Method for Manufacturing Composite Container Next, a method for manufacturing the composite container 100 will be described. A so-called insert molding method can be applied to manufacture the composite container 100 . A mold 50 (see FIG. 4(b)) corresponding to the framework 20, and a side paper face piece 31 and a bottom paper face piece 32 cut into predetermined shapes in advance are prepared. Then, the side paper face piece 31 and the bottom paper face piece 32 are placed in the mold 50 as inserts at predetermined positions, respectively, and the mold 50 is filled with resin. The composite container 100 can be obtained by the method.

As shown in FIG. 4(b), the mold 50 includes one mold member 51 and the other mold member 52, which are divided via a dividing plane. A resin-filled portion corresponding to the shape of the frame body 20 is configured by combining with the mold member 52 . In addition, FIG. 4(b) shows a side cross-sectional structure of the mold 50 in the vicinity of the joint support portion forming region 53 having a shape corresponding to the joint support portion 21a as the resin filling portion. Although not shown, the mold 50 includes, as a resin-filled portion, a reinforcing strut forming region having a shape corresponding to the reinforcing strut 21b and a bottom frame forming region having a shape corresponding to the bottom frame 22. , a top frame forming region having a shape corresponding to the top frame 23, and the like are provided.

As shown in FIG. 4(b), paper facepieces (31, 32) are installed at predetermined positions of the dividing surfaces of one mold member 51 and the other mold member 52. As shown in FIG. In addition, FIG. 4(b) shows a state in which the side paper face piece 31 is installed at a predetermined position. The paper face pieces (31, 32) set at predetermined positions in the mold 50 are sandwiched between the mold members 51, 52. As shown in FIG.

At this time, as shown in FIG. 4(b), one edge portion 31a and the other edge portion 31b of the side paper face piece 31 are inserted into the joining strut portion forming regions 53, respectively. One end side 31a and the other end side 31b of the side paper face piece 31 are inserted into the joining strut forming region 53, and the mold 50 is filled with resin to form the side face piece 31. One end side portion 31a and the other end side portion 31b are joined by the joint support portion 21a to form the side paper face piece 31 in a cylindrical shape. Similarly, the bottom edge side portion 31c, the top edge side portion 31d, and the outer edge of the side paper face piece 31 and the bottom paper face piece 32 are inserted into the bottom frame body forming region and the top frame body forming region, respectively, and reinforced. By inserting the side surface paper face piece 31 into the forming area for the support portion, these are joined when the mold 50 is filled with resin, and the tubular body 30 and the frame body 20 are integrated. The above composite container 100 can be obtained.

As shown in FIG. 4(b), in the present embodiment, a projection 51a that protrudes toward the other mold member 52 is provided on the dividing surface of one mold member 51 in the joining strut portion forming region 53. It is In addition, a concave portion 51b is provided in the vicinity of the convex portion 51a on the dividing surface of one mold member 51. As shown in FIG. With respect to both side portions 31a and 31b of the side paper face piece 31, the convex portion 51a and the concave portion 51b are arranged in this order from the end surface side of the side portions 31a and 31b.

Next, it demonstrates, referring FIG.4(c). FIG. 4C shows a state in which the side paper face piece 31 is installed in the mold 50 below the one-dot chain line shown in the figure, and the mold 50 is filled with resin above the one-dot chain line. 50 is shown removed. These correspond to FIGS. 4(b) and 4(a), respectively.

As shown in FIG. 4(c), when the side paper face piece 31 is placed on the mold 50, one edge portion 31a of the side paper face piece 31 is moved toward the other mold member 52 by the convex portion 51a. Then, the end surface side is pushed up (see white arrow A in FIG. 4(c)). Also, a space is created between one edge portion 31a of the side paper face piece 31 and the concave portion 51b (see white arrow B in FIG. 4(c)). The same applies to the other edge portion 31b. In this state, when the mold 50 is filled with resin, one end side 31a and the other end side 31b of the side paper face piece 31 are pressed against one of the mold members at the position indicated by the outline arrow B by the resin filling pressure. It is pressed to the dividing surface side of 51 . At this time, since the dividing surface is provided with the convex portion 51a and the concave portion 51b, the one edge portion 31a and the other edge portion 31b of the side paper face piece 31 are bent into the concave portion 51b, thereby forming the outer surface. The first bent portion 31e is formed to have a mountain-fold shape when viewed from the side. In addition, one end side portion 31a and the other end side portion 31b of the side paper face piece 31 are folded by the concave portion 51b and the convex portion 51a, so that the second fold forming a valley fold shape when viewed from the outer surface side. A curved portion 31f is formed (see white arrow C in FIG. 4(c)). By providing such protrusions 51a and recesses 51b on one die member 51 of the die 50, the side paper face piece 31 simply cut into a predetermined shape such as a fan shape as shown in FIG. Only by setting it in the mold 50, both side portions 31a and 31b of the side paper face piece 31 are bent and joined to the joint support portion 21a. That is, it is not necessary to bend both side portions 31 a and 31 b of the side paper face piece 31 in advance into a predetermined shape and place the same in the mold 50 .

Here, polyolefin resin such as polypropylene, polyethylene terephthalate resin, or the like is used as a filling resin material to be filled in the mold 50 , and at least the side joined to the frame body 20 is used as the side paper face piece 31 and the bottom paper face piece 32 . By using a laminated paper in which a polyolefin resin sheet such as a polyethylene layer or a polyethylene terephthalate resin sheet or the like is laminated on the surface, the frame body 20 and each paper face piece (31, 32) are heat-sealed during molding, The frame body 20 and each paper face piece (31, 32) can be joined without using an adhesive or the like.

According to the composite container 100 described above, the side paper face piece 31 cut into a predetermined shape is formed into a tubular shape, and the bottom paper face piece 32 is provided to form a bottomed tubular shape. While configuring the housing portion 10 , the strength of the cylindrical body 30 can be supplemented by the frame body 20 made of resin. 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 strength that is lacking with the paper cylindrical body 30 alone, so the amount of resin required for the frame body 20 can be reduced.

In the above-described embodiment, one edge portion 31a and the other edge portion 31b of the side paper face piece 31 are interposed therebetween, and the joining support is provided from the inner surface side and the outer surface side of the edge portions 31a and 31b. It is joined so as to be covered by the portion 21a. Since the entire end surfaces of the end sides 31a and 31b are completely covered in this way, even when the composite container 100 is applied to a container for containing a content containing moisture such as food or a liquid, , moisture or the like can be prevented from entering from the end face portion of the side paper face piece 31. - 特許庁Therefore, even if the end face portion of the side paper face piece 31 is a cut surface obtained by cutting the laminated paper, it is possible to prevent moisture or the like from entering from the cut surface and lowering the rigidity. In addition, even if the side paper face piece 31 is made of laminated paper in which a plurality of sheets are laminated, the entire end face is completely covered, so the laminated sheet may easily peel off from the surface, or one end side may be damaged. It is possible to suppress the problem that the joint strength between the portion 31a and the other edge portion 31b and the joint support portion 21a is lowered. Therefore, the rigidity required for the paper tubular body 30 and the appearance of the composite container 100 can be maintained satisfactorily, and the functions required for the paper tubular body 30 can be maintained.

Furthermore, the composite container 100 can be manufactured by applying the insert molding method as described above. That is, the side paper face piece 31 and the bottom paper face piece 32 having a predetermined shape are installed at predetermined positions as inserts in a mold 50 for manufacturing the framework 20, and resin is injected into the resin-filled portion of the mold 50. By filling, it is possible to manufacture the composite container 100 having the housing portion 10 in which the resin-made framework 20 and the paper-made cylindrical body 30 are joined and integrated.

In addition, in the present embodiment, as described above, only by providing the projections 51a and the recesses 51b on the dividing surface of one of the mold members 51 constituting the mold 50, one of the side paper face pieces 31 can be formed. When the edge portion 31a and the other edge portion 31b are placed at predetermined positions on the dividing surface of the mold 50 and filled with resin, the both edge portions 31a and 31b of the side paper face piece 31 can be folded. The inner surface and the outer surface of each edge portion 31a, 31b can be covered from both sides by the joint strut portion 21a. As described above, according to the present embodiment, even when joining the ends 31a and 31b in a state where the ends 31a and 31b are bent, it is not necessary to bend the ends 31a and 31b in advance. Therefore, the manufacturing efficiency can be improved.

Therefore, according to the composite container 100 and the manufacturing method of the composite container 100 of the above-described embodiment, by combining the resin framework 20 and the paper cylindrical body 30, the amount of resin can be reduced and the manufacturing efficiency can be improved. In addition, the joint state between the frame body 20 made of resin and the top end side portion 31d of the cylindrical body 30 made of paper can be maintained well.

Here, for example, in the mold 60 shown in FIGS. 5B and 5C, one mold member 61 and the other mold member 62 are combined to form the frame body 20 such as the joining strut forming region 63. A resin-filled portion corresponding to the shape of is configured. The mold 60 is substantially the same as the mold 50 shown in FIGS. It has a similar configuration. Even when such a mold 60 is used, the side paper face piece 31 and the bottom paper face piece 32 are placed at predetermined positions, and the resin filled portion of the mold 60 is filled with resin in the same manner as in the above embodiment. By doing so, it is possible to manufacture the composite container 100 having the housing portion 10 in which the resin-made frame body 20 and the paper-made cylindrical body 30 are joined and integrated.

However, in this case, as shown in FIG. 5B, the entire inner surface of the side paper face piece 31 is in contact with the dividing surface of one of the metal mold members 61, and the resin is filled in the joining strut portion forming region 63. be done. Therefore, one edge 31a and the other edge 31b of the side paper-made face piece 31 are covered with the resin filler constituting the joint support 64 on the outer surface side, but in FIG. As shown by the arrow D, the resin filler does not sufficiently wrap around the inner surface, making it difficult to cover the entire end surfaces of the end sides 31a and 31b with the resin filler. As a result, in the obtained composite container 100, the end faces of one edge portion 31a and the other edge portion 31b of the side paper face piece 31 may be in an exposed state where the inner surface side is not covered with resin. If even a part of the end face is exposed, and moisture adheres to the end face, the moisture or the like may enter the inside of the side paper face member 31 from the end face, resulting in a decrease in rigidity. In addition, when the side surface paper face piece 31 is made of laminated paper in which a plurality of sheets are laminated, problems such as the laminated sheets peeling off from the surface or the joint strength of the both end sides 31a and 31b decreasing. may occur. On the other hand, in the composite container 100 of the above-described embodiment, the both side portions 31a and 31b are joined in such a state that the respective side portions 31a and 31b are embedded in the joint support portion 21a. It is possible to prevent problems from occurring.

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 skeleton 20 is mainly joined to the outer surface of the cylindrical body 30 (the side paper-made face piece 31 and the bottom paper-made face piece 32), but the composite container according to the present invention It is not limited to the mode. For example, the frame body 20 may be joined mainly on the inner surface side of the cylindrical body 30, and the frame body 20 may not be arranged on the outer surface side of the housing portion 10, or a part of the frame body 20 may be attached to the cylindrical body 30. Various modes can be applied, such as joining from the outer surface side and joining the rest from the inner surface side of the cylindrical body 30 .

If the frame body 20 is mainly joined to the outer surface side of the cylindrical body 30 as in the above embodiment, the frame body 20 does not protrude inside the container 10. , puddings, creams, and other cosmetics, etc., the contents adhere to the joint portion between the frame body 20 and the cylindrical body 30, and the contents cannot be taken out cleanly. can be suppressed.

On the other hand, if the frame body 20 is joined mainly from the inner surface side of the cylindrical body 30 and the frame body 20 is covered with the cylindrical body 30, the frame body 20 can be made invisible from the outside.
In the above-described embodiment, the side frame body 21 is composed of the joint strut portion 21a and the reinforcing strut portion 21b. If the number of framework bodies 20 on the outer surface of the cylindrical body 30 is increased, for example, when the number of struts 21b is increased, the appearance may be spoiled. In such a case, it is preferable to join the two so that the frame body 20 is mainly arranged inside the tubular body 30 .
Further, when the composite container 100 is used as a container for use in a bathroom or the like, water droplets may adhere to the outer surface of the composite container 100 due to dew condensation or the like. When the framework 20 is arranged outside the composite container 100, the water droplets adhering to the framework 20 remain attached to the outer surface of the composite container 100, and the edges 31a, 31a, etc. There is a possibility that water may easily enter from the 31b portion or the like. Therefore, it is preferable that the frame body 20 is arranged inside the cylindrical body 30 for a container that is used in an environment such as a bathroom where water droplets adhere or dew condensation is likely to occur due to the humidity in the atmosphere. .

As described above, it is possible to appropriately select whether the frame body 20 is arranged inside or outside the cylindrical body 30 depending on the contents and the appearance required for the composite container 100 .

Further, in the above-described embodiment, one edge portion 31a and the other edge portion 31b of the side paper surface body 31 are bent so as to protrude radially outward, and are joined so as to cover the outer surface and the inner surface. Although both side portions 31a and 31b are joined by the strut portion 21a, for example, when joining both so that the frame body 20 is arranged mainly inside the cylindrical body 30, one side of the side paper face piece 31 When the edge portion 31a and the other edge portion 31b are bent so as to protrude radially inward, the outer surface and the inner surface of the edge portion 31a and the other edge portion 31b are joined from the inner surface side of the side paper face piece 31 by the joining strut portion 21a so as to cover the outer surface and the inner surface. good.

Furthermore, when folding the one edge portion 31a and the other edge portion 31b of the side paper face piece 31, for example, as shown in FIG. It may be bent so as to protrude from the outer surface of the tubular body 30 substantially in parallel with the respective end sides 31a and 31b at the spaced apart position as a bent portion 31g. In this case, as shown in FIG. 6(b), a mold 70 having a mold member 71 on one side and a mold member 72 on the other side is used, and one portion of the side paper face piece 31 is used in the same manner as in the above-described embodiment. One end side portion 31a and the other end side portion 31b are inserted into the joining support portion forming region 73, and in the joining support portion forming region 73, the convex portion 71a provided on the dividing surface of one mold member 71 is used to 31a and 31b are pushed up toward the other metal mold member 72, and filled with resin. , is joined to the joining support 21a.

Further, in the above-described embodiment, in a state in which both side portions 31a and 31b of the side paper face piece 31 are folded, both sides of the inner surface and the outer surface are covered with the joint strut portion 21a to be joined together. However, in the composite container 100, it is not always necessary to bend the both side portions 31a and 31b of the side paper face piece 31. As shown in FIG. When the side paper face piece 31 is rolled into a tubular shape, the one edge portion 31a and the other edge portion 31b are interposed therebetween, and the one edge portion 31a and the other edge are interposed therebetween. Any form may be used as long as it is joined by a joining portion (joining strut portion 21a) that covers the entire end surface of the side paper face piece 31 at the portion 31b.

Furthermore, in the above-described embodiment, the side paper face piece 31 with rounded corners and the circular bottom paper face piece 32 are joined to the bottom frame 22 and top frame 23, respectively, so that the side paper face piece 31 And the bottom paper face piece 32 is made difficult to peel off from the joints with the bottom frame body 22 and the top frame body 23, and these places are also the same as the one edge part 31a and the other edge part 31b. , are also preferably joined so that the inner and outer surfaces thereof are covered with the frames (22, 23). At this time, the frame body 20 and the paper face pieces (31, 32) are joined and integrated in such a manner that the joint edge portions are embedded in the frame body while the joint edge portions are folded. You may do so.

In the above-described embodiment, the bottom surface 11 and the top surface 13 of the housing portion 10 are formed in a circular cup shape, 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 or in the shape of a bottle, and the shape of the bottom surface 11 and the top surface 13 is not limited to circular, and may be square, rectangular, or polygonal. good too.

In the above embodiment, one sheet of side paper face piece 31 is rolled and one end side 31a and the other end side 31b are joined together. The number of side paper face pieces 31 used in 1 is not particularly limited, and two or more side face pieces 31 may be used and the cylindrical body 30 may be obtained by joining the edges of the side paper face pieces 31 together. In addition, one sheet of side paper face piece 31 may have a notched portion, and the cut edges may be joined using a part of the side frame body 21 as in the above-described embodiment. . By doing so, it is possible to form the accommodating portion 10 having various shapes.

Furthermore, in the above-described embodiment, the bottom frame 22 and the bottom paper face piece 32 are used to configure the bottom surface 11 of the housing portion 10, but the shape of the bottom frame 22 is not particularly limited. For example, the bottom frame body 22 may be provided with reinforcing ribs such as a cross, or the entire surface of the bottom surface 11 may be made of a resin bottom material, and the configuration of the bottom surface 11 is particularly limited. not a thing In addition, when the entire surface of the bottom surface 11 is composed of a bottom material made of resin, there is no need to use the bottom paper face piece 32, and such an aspect is also included in the composite container according to the present invention.

In the above-described embodiment, the side frame body 21 is composed of the joining strut part 21a and the reinforcing strut part 21b. It is only necessary to have a joint portion for joining them between the edge portions of the , and the other points are arbitrary. That is, if the cylindrical body 30 itself satisfies the required strength, the reinforcing strut portion 21b is not necessary, and the side frame body 21 may be composed only of the joint strut portion 21a. Further, the specific configurations of the side frame members 21, the bottom frame member 22, and the top frame member 23 are arbitrary as long as any one of them has the joint portion referred to in the present invention.

Reference Signs List 10: Housing portion 11: Bottom surface 12: Side surface 13: Top surface 20: Frame body 21: Side frame body 21a: Joint strut part (joint part)
21b: Reinforcing support column 22: Bottom frame 22a: Bottom annular frame 22b: Side annular frame 22c: Bottom bone joint 22d: Connecting portion 23: Top frame 23a: Inner frame 23b: Flange 23c: Outer frame 23d : Inner peripheral rib 23e : Outer peripheral rib 23f : Annular protruding rib 30 : Cylindrical body 31 : Side paper face body 31a : Edge 31b : Edge 31c : Bottom edge 31d : Top edge 31e : First bent portion 31f : second bent portion 31g : bent portion 32 : bottom paper face piece 50 : mold 51 : mold member 51a : convex portion 51b : concave portion 52 : mold member 53 : joining strut portion forming region 60 : mold 61 : Mold member 62 : Mold member 63 : Joining strut portion forming region (joining portion forming region)
64 : Joint support 70 : Mold 71 : Mold member 71a : Convex portion 72 : Mold member 100 : Composite container O : Center axis

Claims (6)

Having a bottom surface and a side surface, and having a housing portion configured using a resin framework and a paper tubular body,
The paper tubular body is one or a plurality of paper facepieces formed into a tubular shape,
The skeleton body has a joint portion interposed between one edge portion and the other edge portion of the paper face piece and covering the entire end surface of the one edge portion and the other edge portion. , compound container. 2. The composite container according to claim 1, wherein said one edge portion and said other edge portion are bent to protrude from the outer surface of said cylindrical body and are embedded in said joint portion. The frame body includes a bottom frame body that forms an outer edge of the bottom surface, a top frame body that forms an outer edge of the top surface of the housing portion, and the joint portion. and a side frame body to be connected,
The side surface of the housing portion is composed of the side frame body and a side surface paper-made face piece formed into a cylindrical shape by joining the one end side portion and the other end side portion to the joint portion,
The bottom surface of the storage section is composed of the bottom frame body and a bottom paper face piece having an outer edge portion joined to the bottom frame body,
3. The composite container according to claim 1, wherein the paper tubular body has a bottom edge portion joined to the bottom frame body and a top edge portion joined to the top frame body. A composite container manufacturing method for manufacturing the composite container according to any one of claims 1 to 3,
It has one mold member and the other mold member that are divided via a dividing surface, and by combining the one mold member and the other mold member, Using a mold in which a shaped resin-filled part is formed,
The paper face piece is placed between the one mold member and the other so that the edge portion of the paper face piece is inserted into the joint forming region having a shape corresponding to the joint portion in the resin-filled portion. The one edge portion and the other edge portion of the paper-made face piece are separated from each other by placing it between the mold members and sandwiching it between the two mold members, and filling the resin-filled portion with the resin. A manufacturing method of a composite container, wherein the composite container is obtained by joining the frame body and the tubular body by the joining portion. A convex portion protruding from the dividing surface of the one mold member toward the other mold member is provided in the joint forming region,
5. The method of manufacturing a composite container according to claim 4, wherein the resin filling portion is filled with resin while the edge portion of the paper face piece is pushed up toward the other mold member by the convex portion. At the position where the edge portion is arranged in the joining portion forming region, the dividing surface of the one mold member is provided with a concave portion in the vicinity of the convex portion. The convex portion and the concave portion are arranged in this order,
6. The method of manufacturing a composite container according to claim 5, wherein when the resin is filled in the resin-filled portion, the edge portion is bent by the resin filling pressure and the concave portion and the convex portion.

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