JP2700382B2 - Molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus, and more particularly to a molding apparatus used for molding a container from a sheet such as an aluminum foil.

[0002]

2. Description of the Related Art FIG. 15 is an external perspective view of an aluminum foil container formed by a conventional molding apparatus.

Referring to the drawing, an aluminum foil container 45 is formed of a bottom 43 and a side wall 41 rising from the periphery of the bottom 43. A plurality of folds 39 are formed on the side wall 41 all around. By forming the folds 39, such a container shape can be formed from a circular aluminum foil sheet.

FIG. 16 is an exploded perspective view showing a schematic structure of a forming apparatus for forming the aluminum foil container 45 shown in FIG.

Referring to the drawings, a molding apparatus includes a first mold member 29 and a second mold member opposed to first mold member 29 via an aluminum foil sheet (not shown) which is an object to be molded. And a member 17.

The first mold member 29 has a cylindrical shape which is one of the hollow pillars, the upper wall of which is inclined toward the inside of the cylindrical body 61, and the surface of the first mold member 29 has a cylindrical shape. A first step groove 19 extending radially from the central axis of 61 is formed. The inner wall 21 of the cylindrical body 61 has a second step groove 22.
Are formed, and the first step groove 19 and the second step groove 22 are connected to each other. An edge 63 is fixed on the cylindrical body 61 at the outer edge of the first step groove 19.

On the other hand, the second mold member 17 has a cone-shaped push rod 49 having a cylindrical shape, and a cone 55 having a punch-shaped push rod 49 which can be freely inserted into and removed from an opening 57 formed in the center thereof. It is composed of The tip of the punch-like push rod 49 is formed with a tapered portion 53 that is tapered, and a gear-shaped groove 51 is formed on its peripheral wall in parallel with the axial direction.
A bevel gear-shaped groove 59 is formed on the side wall of the cone 55. Each of the gear-shaped groove 51 and the bevel gear-shaped groove 59 is provided so as to correspond to the number and position of the convex portions of the first step groove 19 of the first mold member 29.

FIGS. 17 to 19 correspond to XV in FIG.
It is sectional drawing corresponding to II-XVII line. FIG. 17 shows the first stage before the stamping is started.
8 shows a second stage in the middle of molding, and FIG. 19 shows a final stage of molding. Hereinafter, the operation of forming a container made of aluminum foil by a conventional forming apparatus will be described with reference to these drawings.

As shown in FIG. 17, a plurality of laminated aluminum foil sheets 35 are stacked on the step groove 19 formed in the upper wall of the cylindrical body 61 of the first mold member 29. Is placed, and the edge 63 is positioned in the horizontal direction. In this state, the second mold member 17
The gear-shaped groove 51 of the tapered portion 53 formed at the tip of the punch-like push rod 49 and the bevel gear-shaped groove 59 formed on the side wall of the cone 55 are located at positions facing the step groove 19, respectively. I have.

Next, as shown in FIG. 18, the second mold member 17 is gradually lowered, and the bevel gear-shaped groove 59 formed on the side wall of the cone 55 sandwiches the aluminum foil sheet 35. In this state, a step-like fold is formed in a portion that comes into contact with the step groove 19 and becomes the side wall 41 of the aluminum foil container 45. On the other hand, the tip end portion 54 of the punch-like push rod 49 presses the aluminum foil sheet 35 to form the bottom 43 of the aluminum foil container 45 thereon.

FIG. 19 shows the state of FIG.
And the cone 55 are further lowered. In this state, the bevel gear-shaped groove 59 formed on the side wall of the cone 55 and the step groove 19 formed on the cylindrical body 61 are completely engaged. Body 61
Further descends along the inner wall 21. As a result, the circular laminated aluminum foil sheet 35 has a shape as shown in FIG. 15, that is, a container-shaped aluminum foil having a bottom portion 43 and a side wall portion 41 formed with a fold 39 rising from the bottom portion 43 to the periphery. It is formed into a container and extruded to the lower part of the cylindrical body 61. When the aluminum foil sheet 35 is extruded as a laminated aluminum foil container, the second mold member 17 is lifted upward and returns to the state of FIG. After the new circular laminated aluminum foil sheet 35 is placed on the above, the above operation is repeated. Thus, desired aluminum foil containers are formed one after another from the circular laminated aluminum foil sheet 35.

[0012]

In the conventional molding apparatus as described above, aluminum foil containers are formed one after another, but in terms of the quality of the formed aluminum foil container,
It was insufficient molding. That is, as shown in FIG. 15, the side wall 41 of the aluminum foil container 45 has
The folds 39 are formed, and many wrinkles 47 are generated below the folds 39, which degrades aesthetic quality. It is considered that the wrinkles 47 occur at a stage during the molding, as shown in FIG. That is, in this state,
Although the folds have begun to be formed on the side wall 41 of the circular laminated aluminum foil sheet 35, a part 65 of the side wall 41 of the aluminum foil container is wrung because the punch-like push rod 49 descends in this state. That is, this remains as wrinkles 47 shown in FIG.

In order to prevent the wrinkles from occurring, the punched push rod 49 is not lowered to the inner wall 21 of the cylindrical body 61, but the molded aluminum foil container is removed from the upper part of the cylindrical body 61. However, such a method requires time and effort to remove the formed aluminum foil container, and does not become an efficient forming device in order to form a large number of aluminum foil containers one after another. .

The present invention has been made in order to solve the above-mentioned problems, and is suitable for mass molding of an aluminum foil container, and can improve the aesthetic appearance of the formed aluminum foil container. The purpose is to provide.

[0015]

A molding apparatus according to the present invention sandwiches a sheet between a first mold member and a second mold member, and connects the first mold member and the second mold member. A molding device for molding a container having a fold formed on at least a part of its side wall from a sheet by crimping, wherein the first mold member includes a first hollow pillar. The upper wall of the first hollow column is inclined so as to descend inwardly of the first hollow column, and extends to the surface of at least a part of the upper wall radially from the central axis of the first hollow column. One step groove is formed, the first step groove is connected to a second step groove formed in the inner wall of the first hollow column parallel to the axial direction, and the second mold member is , A solid column or a second hollow column,
The solid column or the second hollow column is provided radially from the end of the solid column or the second hollow column so as to face each of the first step grooves of the mold member. A plurality of plate-like members rotatable to a position along at least a portion of the peripheral wall of the body, and a solid pillar or a second hollow pillar of the second mold member, the first mold member of the first mold member. As the hollow column advances to the inner wall, the plate-like member comes into contact with the first step groove, and as the solid column or the second hollow column advances, each of the plate-like members Is gradually rotated along at least one portion of the peripheral wall of the solid pillar or the second hollow pillar along the first step groove, and each of the plate-like members is completely solid pillar or the second pillar. Is housed at a position corresponding to the second step groove on the inner wall of the first hollow column along at least a part of the peripheral wall of the hollow column. That.

[0016]

In the present invention, the plate-like member gradually moves from the first step groove to the second step groove along the second step groove as the second mold member advances to the inner wall of the first mold member. Of the mold member toward the peripheral wall of the solid pillar or the second hollow pillar.

[0017]

FIG. 1 is an exploded perspective view showing a schematic structure of a molding apparatus according to an embodiment of the present invention.

Referring to the drawings, the forming apparatus is composed of a pair of a first mold member 29 and a second mold member 17 facing each other across a circular laminated aluminum foil sheet (not shown).

The first mold member 29 includes a cylindrical body 18 and a ring-shaped stopper 27 fixed to a peripheral wall of the cylindrical body 18.
And a ring-shaped outer frame 23 mounted on the stopper 27 via a spring 25 so as to be bufferable. On the upper wall of the cylindrical body 18, a first step groove 19 which is inclined in the inner direction of the cylindrical body 18 and radiates from the central axis of the cylindrical body 18 to the surface thereof, and an inner wall 21 of the cylindrical body 18 includes: A second step groove 22 formed parallel to the axial direction of the cylindrical body 18 connected to the first step groove 19 is formed.

On the other hand, the second mold member 17 is constructed around the cylindrical punch-like push rod 1. A screw hole 15 for connecting to an external device is formed in the upper wall of the punch-like push rod 1, and a plurality of foldable plate-like members 3 are radially attached to the other end. I have. Further, a pair of rotatable rollers 4 is attached to each end of the plate-shaped member 3. On the peripheral wall of the punch-like push bar 1 at a position corresponding to each of the plate-like members 3, a plurality of storage grooves 5 for accommodating the plate-like member 3 are formed in parallel with the axial direction of the push-like push bar 1 in a molding step. An annular groove 6 for accommodating the pair 4 is formed at right angles to the axial direction of the punch-like push bar 1. In addition, a punch-like push rod 1
A disc-shaped guide plate lid 13 having a circular opening 14 formed at the center thereof, at which the punch-like push rod 1 can freely move up and down, is located at the upper part of the guide plate cover 13. A guide plate support cylinder 11 is provided below the guide plate lid 13. The guide plate 9 having a curved surface from the inner wall toward the center is formed by the number of the plate-like members 3. The same number is formed. Although the guide plate lid 13 and the guide plate support cylinder 11 are actually integrated, they are deliberately disassembled up and down here to clarify their structures. The distance between the guide plates 9 formed in the guide plate support cylinder 11 is slightly larger than the plate thickness of the plate member 3, so that the operation of the plate member 3 can be performed without hindering the rotation operation. The interval is defined so as to guide the distance.

FIGS. 2, 4, 6 and 8 are sectional structural views corresponding to line II-II in FIG. Here, FIG. 2 shows a first stage before entering the press forming, FIG. 4 shows a second stage in the first half of the molding, and FIG. 6 shows a third stage in the second half of the molding. FIG. 8 shows the final stage of molding.

Each cross-sectional structural view is different from FIG. 1 and shows a state in which the respective members are combined in accordance with an actual use state. Further, between the first mold member and the second mold member, The drawing shows a state in which the circular laminated aluminum foil sheet 35 is placed. Hereinafter, the molding operation of the aluminum foil container will be described with reference to these drawings.

As shown in FIG. 2, a bottom presser 31 is attached to the lower part of the punch-like push rod 1 composed of the columnar body 7, and is formed by the columnar body 7 and the bottom presser 31. A ring 33 is mounted in the space. On the other hand, the plate-shaped member 3
An opening 34 is formed in one side of the plate member 3 so that the ring 33 can pass therethrough.
Is rotatably attached to the punch-like push rod 1 around the ring 33. A pair of rollers 4 is rotatably attached to the other part of the plate member 3, and the rollers 4 are supported on the upper surface of a guide plate 9. The storage groove 5 formed in the side wall of the punch-like push rod 1 is such that when the plate-like member 3 rotates and follows the peripheral wall of the cylindrical body 7, about half thereof is housed in the cylindrical body 7. Formed at a depth of Annular groove 6
Is formed to such a depth that the tip of the plate member 3 and about half of the roller 4 are housed.

As described above, the plate member 3 is rotatable around the ring 33, but the guide plate support cylinder 11 is attached to the outer portion thereof. Stand still at an angle θ ₁ with respect to the horizontal level. On the other hand, the first step groove 1 formed in the cylindrical body 18 constituting the first mold member
9 is formed at an angle θ ₂ with respect to the horizontal level. Here, the side perspective angles θ ₁ and θ ₂ are 0 to 45.
Although it can be used in the range of °, the most preferable angle is 20 to 25 °. The angle theta ₂ is may be slightly larger than the angle theta _1, these angles on the molding direction of the same is more preferable.

FIG. 3 is a sectional view taken along line III-III of FIG. Referring to the figure, plate-like members 3 attached to the lower part of columnar body 7 are radially aligned around cylindrical body 7, and guide plate 9 is
The plate-like member 3 is attached to the guide plate support cylinder 11 in the direction of the columnar body 7 so that the plate-like member 3 is rotatable between the respective members. Further, the plate-shaped member 3 is partially housed in a storage groove 5 formed in the columnar body 7. Further, the roller 4 is in contact with the inner surface of the guide plate support cylinder 11 and is stationary.

FIG. 4 shows the second mold member 17 from the state shown in FIG.
FIG. 5 is a sectional structural view showing a state where the plate-shaped member 3 and the first step groove 19 are engaged via the aluminum foil sheet 35, and FIG. 5 is a sectional view taken along line VV in FIG. It is.

Referring to these figures, the second mold member 17
Is lowered, the plate-shaped member 3 engages with the concave portion of the first step groove 19 via the aluminum foil sheet 35. Accordingly, in the circular laminated aluminum foil sheet 35, the portion outside the position of the bent portion 37 becomes the side wall portion 41 and the fold 39 starts to be formed. At this time, the guide plate support cylinder 11 that has prevented the spread of the plate member 3 hits the outer frame 23 and lowers it. Outer frame 2 lowered against elastic force of spring 25
3, the stopper 27 stops descending at a predetermined position. As a result, the guide plate support cylinder 11 does not descend further together with the guide plate lid 13.

FIG. 6 shows the state of FIG.
FIG. 7 is a sectional structural view showing a state in which
FIG. 7 is a sectional view taken along line VII-VII of FIG.

With reference to these figures, when the push-shaped push bar 1 further descends while the plate-shaped member 3 is engaged with the concave portion of the first step groove 19, the plate-shaped member 3 The first step groove 19 to the second step groove 2
It gradually tries to rotate to the peripheral wall side of the punch-like push rod 1 along the shape of the connection point 2. On the other hand, as shown in the figure, the thickness of the guide plate cover 13 is increased toward the center, and the roller 4 moves while rotating along the lower surface of the guide plate cover 13. Therefore, the plate-like member 3 is made of laminated aluminum foil 35
In response to this, the guide plate cover 13 rotates toward the punch-shaped push rod 1 while maintaining the pressing force based on the weight of the guide plate cover 13 and the repulsive force of the spring 25. Therefore, the side wall portion 41 of the circular laminated aluminum foil sheet 35 rises smoothly with the movement of the plate member 3 with the folds 39 formed. Therefore, the side wall 41 is not squeezed as in the molding by the molding apparatus shown in the conventional example, and the generation of wrinkles in the side wall is prevented. In this state, as described above, the guide plate support cylinder 11 and the guide plate lid 13 are
Since the lowering is prevented by the outer frame 23, the turning operation of the plate-like member toward the punch-like push rod 1 is not hindered.

FIG. 8 shows the state of FIG.
FIG. 9 is a sectional view showing a final state of molding in which is pressed into the inner wall portion 21 of the cylindrical body 18, and FIG. 9 is a sectional view taken along line IX-IX in FIG.

Referring to these figures, when the punch-like push rod 1 further descends with respect to the inner wall portion 21 of the cylindrical body 18, the plate-like member 3 and the roller 4 further rotate toward the peripheral wall on the punch-like push rod 1 side. The punch-like push bar 1 is finally moved into a state where it is housed in each of the storage groove 5 and the annular groove 6 formed on the peripheral wall of the punch-like push bar 1, and descends. At this time, the plate member 3
Since it is located at a position corresponding to the concave portion of the second step groove 22, the fold 39 of the side wall portion 41 of the circular laminated aluminum foil sheet 35 formed in the previous molding step is punched while maintaining its shape. It will descend together with the push rod 1. In this state, no force is applied to the folds 39 from the lateral direction, so that no wrinkles are generated, and the aluminum foil sheet is carried out from the lower portion of the cylindrical body 18 in a state where the aluminum foil container is completed. When the formation of one circular laminated aluminum foil sheet 35 is completed in this way, the second mold member, that is, the punch-like push rod 1, the guide plate support cylinder 11, and the guide plate cover 13 are lifted up, as shown in FIG. Then, a new circular laminated aluminum foil sheet 35 is placed thereon, and the same forming operation is repeated thereafter.

As described above, the plate member repeats the turning operation from the state shown in FIG. 2 to the state shown in FIG. 8 for each molding step. Since it is guided by 9, there is almost no left-right deviation, and the folds of the aluminum foil container can be formed more accurately.

FIG. 10 is an external perspective view of an aluminum foil container formed by a forming apparatus according to one embodiment of the present invention.

Referring to the figure, an aluminum foil container 45 has a fold 39 formed on a side wall 41 rising from the periphery of a bottom 43 thereof, and has a wrinkle similar to the conventional example shown in FIG. There is no occurrence, and the shape is clear.

FIG. 11 is an exploded perspective view showing a schematic structure of a molding apparatus according to a second embodiment of the present invention. FIG. 12 is an external perspective view of an aluminum foil container formed by the molding apparatus of FIG. .

Referring to FIG. 12, an elliptical aluminum foil container 92 has a bottom 9 having an outer edge formed by a straight line and an arc.
3 and fold-shaped side walls 95a, 95b rising from the arc-shaped outer edge of the bottom 93 and flat side walls 97a, 97b rising from the linear outer edge of the bottom 93.

Referring to FIG. 11, the forming apparatus includes a first mold member 7 having a shape corresponding to laminated aluminum foil 81 having a shape obtained by combining a rectangular sheet and two semicircular sheets.
It is mainly composed of the first and second mold members 83. The first mold member 71 is basically a first mold member according to the first embodiment.
It has the same characteristics as the mold member 29. However, the first step groove 73 is not formed on the entire surface of the upper wall of the hollow pillar 72, and a part thereof is a flat portion 77. The shape of the inner wall of the hollow column 72 also corresponds to the shape of the upper wall.

On the other hand, on the arc-shaped outer edge at the end of the solid column 84 of the second mold member 83, a fold-up member having a roller 87 attached to the tip thereof as in the first embodiment. A plurality of plate members 85 are rotatably mounted. However, such a plate-shaped member is not provided at the linear outer edge at the end of the solid columnar body 84. In addition, the foldable plate member 85
A storage groove 89 and an annular groove 91 are formed as shown in FIG.

As described above, the first mold member 71 and the second mold member 83 are prepared and, similarly to the first embodiment, the laminated aluminum foil 81 is sandwiched therebetween to perform the forming process. As shown at 12, the fold-like side wall portions 95a, 95
An oval aluminum foil container 92 without wrinkles can be formed. Although FIG. 11 does not show the components corresponding to the guide plate 9, the guide plate support cylinder 11 and the guide plate cover 13 shown in the first embodiment, the plate-like member for folding is actually used. What is necessary is just to provide the thing corresponding to these in correspondence with 85.

FIG. 13 is an exploded perspective view showing a schematic structure of a molding apparatus according to a third embodiment of the present invention, and FIG. 14 is an external perspective view of a rectangular aluminum foil container formed by the molding apparatus of FIG. It is.

Referring to FIG. 14, rectangular aluminum foil container 1
21 is a bottom 127 whose outer edge is formed by combining a straight line and four arcs, fold-shaped side walls 123a to 123d rising from the arc-shaped outer edge, and a flat side wall 125a rising from the straight outer edge. To 125d.

Referring to FIG. 13, a first step groove 101 formed in first mold member 99 and a foldable plate member 1 formed in second mold member 111 constituting this molding apparatus.
13 is a pleated side wall 1 of the aluminum foil container 121 of FIG.
Each of them is formed corresponding to the positions of 23a to 123d and the number of folds. By pressing the laminated aluminum foil 109 by forming the forming apparatus in this manner,
In the same manner as in each of the above embodiments, a rectangular aluminum foil container 121 having no wrinkles on the fold-like side wall as shown in FIG. 14 can be formed. FIG. 13 does not show the components corresponding to the guide plate 9, the guide plate support cylinder 11 and the guide plate cover 13 shown in the first embodiment, but actually, a foldable plate member. What is necessary is just to provide the thing equivalent to these corresponding to 113.

In each of the above embodiments, the sheet is made of aluminum foil, but the same effect can be obtained by using another metal foil, film, paper or the like. It goes without saying that it plays.

In each of the above embodiments, the plate member is rotatable about the ring, but may be rotatable using another structure.

Further, in each of the above embodiments, the second mold member is formed around a solid column, but the same effect can be obtained by using a hollow column instead of the solid column.

From the above-described embodiment, protection of the invention as described below can be considered. 1. A substantially circular sheet is sandwiched between a first mold member and a second mold member, and the first mold member and the second mold member are pressed against each other to fold the sheet from the sheet to a side wall thereof. A molding device for molding a container-like product formed with: wherein the first mold member is substantially composed of a first cylinder, and an upper wall of the first cylinder is formed of the first cylinder. A first step groove is formed on a surface of the first cylinder body, the first step groove being inclined toward the inside of the body, and radiating from a central axis of the first cylinder body. The second mold member is connected to a second step groove formed in the inner wall and parallel to the axial direction, and the second mold member includes a substantially cylindrical body or a substantially second cylindrical body, and the second mold member includes the first mold member and the second mold member. The cylindrical body or the second cylindrical body is provided radially from an end of the stepped groove so as to face each of the step grooves. Wherein the position cylinder or the second
A plurality of plate-like members rotatable to positions along the peripheral wall of the cylindrical body, and the second mold member progressing to the cylindrical body or the inner wall of the first mold member of the second cylindrical body. With this, the plate-shaped member comes into contact with the first step groove, and further, as the columnar body or the second cylindrical body advances, each of the plate-shaped members moves along the first step groove. While gradually rotating toward the peripheral wall of the cylindrical body or the second cylindrical body, each of the plate-like members is completely aligned along the peripheral wall of the cylindrical body or the second cylindrical body, and A molding device which is housed at a position corresponding to the second step groove on the inner wall of the cylindrical body.

(Purpose or Effect) As the plate-like member advances to the inner wall of the first mold member of the second mold member, the plate-like member gradually moves from the first step groove to the second step groove along the second step groove. Since it rotates toward the peripheral wall of the cylindrical body or the second cylindrical body of the mold member, the contact between the plate-shaped member and the first and second step grooves becomes smooth, and the side wall of the molded container-like material is formed. No unnecessary wrinkles are formed.

2. Item 2. The molding device according to item 1, wherein each of the plate-shaped members rotates while maintaining a predetermined pressing force against the first step groove.

(Purpose or Effect) The folds on the side wall of the sheet are more clearly formed.

3. A plurality of grooves are formed in the peripheral wall of the cylindrical body or the second cylindrical body of the second mold member along an axial direction thereof, and a part of the plate member can be housed in the grooves. , The molding apparatus according to item 1 or 2.

(Purpose or Effect) The plate member descends on the inner wall of the first mold member in a stable state.

4. The molding apparatus according to any one of items 1 to 3, wherein the second mold member includes a plurality of guide plates for maintaining an interval between the plate members when the plate member rotates.

(Purpose or Effect) The pressure-bonding position of the plate-like member to the first step groove is accurately maintained.

5. The molding apparatus according to any one of items 1 to 4, wherein the sheet includes a laminated aluminum foil sheet.

(Purpose or Effect) The molding process is facilitated, and a large number of molded products can be obtained by one molding process.

[0056]

As the plate-like member advances from the first mold groove to the inner wall of the first mold member, the plate-like member gradually moves along the second mold groove from the second mold member. Since it rotates toward the peripheral wall of the solid column or the second hollow column, the plate-shaped member and the first
Also, the contact with the second step groove becomes smooth, and unnecessary wrinkles are not formed on the folds of the side wall portion of the formed container.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a schematic structure of a molding apparatus according to a first embodiment of the present invention.

FIG. 2 is a view corresponding to a cross-sectional structural view taken along line II-II of FIG. 1, showing a state where the apparatus is assembled.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a sectional structural view showing a state where a second mold member is lowered from the state shown in FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a cross-sectional structural view showing a state where the punch-like push rod is further lowered from the state of FIG.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

FIG. 8 is a sectional structural view showing a state in which the tip of the punch-like push rod has been lowered to the position of the inner wall of the cylindrical body from the state of FIG.

FIG. 9 is a sectional view taken along line IX-IX of FIG. 8;

FIG. 10 is a perspective view showing an external shape of an aluminum foil container formed by the forming apparatus according to the first embodiment of the present invention.

FIG. 11 is an exploded perspective view showing a schematic structure of a molding apparatus according to a second embodiment of the present invention.

FIG. 12 is a perspective view showing an external shape of an oval aluminum foil container formed by the forming apparatus of FIG. 11;

FIG. 13 is an exploded perspective view showing a schematic structure of a molding apparatus according to a third embodiment of the present invention.

FIG. 14 is a perspective view showing the external shape of a rectangular aluminum foil container formed by the forming apparatus of FIG.

FIG. 15 is a perspective view showing an external shape of an aluminum foil container formed by a conventional forming apparatus.

FIG. 16 is an exploded perspective view showing a schematic structure of a conventional molding apparatus.

17 is a view corresponding to a cross-sectional structural view taken along the line XVII-XVII of FIG. 16, showing a state where the apparatus is assembled.

18 is a cross-sectional structural view showing a state where the second mold member is lowered from the state shown in FIG.

FIG. 19 is a sectional structural view showing a state where the punch-like push rod is further lowered from the state of FIG. 18;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 punch-like push rod 3 plate-like member 7 cylindrical body 17 second mold member 18 cylindrical body 19 first step groove 21 inner wall 22 second step groove 29 first mold member 35 circular laminated aluminum foil sheet 71 first Mold member 73 first step groove 75 inner wall 81 laminated aluminum foil 83 second mold member 85 foldable plate member 99 first mold member 101 first step groove 103 inner wall 109 laminated aluminum foil 111 second mold Member 113 Plate member for folding In the drawings, the same reference numerals indicate the same or corresponding parts.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-16469 (JP, A) JP-A-58-117919 (JP, U) JP-A-61-127836 (JP, U)

Claims (1)

(57) [Claims] 1. A sheet is sandwiched between a first mold member and a second mold member, and the first mold member and the second mold member are pressed against each other to form a side wall portion from the sheet. A molding apparatus for molding a container having a fold formed in at least a part thereof, wherein the first mold member comprises a first hollow column, and the first mold member is formed on the first hollow column. The wall is inclined so as to fall in the interior direction of the first hollow column, and a first step groove radiating from a central axis of the first hollow column is formed on a surface of at least a part of the upper wall. Wherein the first step groove is connected to an axially parallel second step groove formed in at least a part of an inner wall of the first hollow column, and wherein the second mold is formed. The member is opposed to a solid pillar or a second hollow pillar and each of the first step grooves of the first mold member. Radially provided from an end of the solid pillar or the second hollow pillar, and rotated from the opposed position to a position along at least a part of a peripheral wall of the solid pillar or the second hollow pillar. A plurality of movable plate-like members, and the inner wall of the first hollow column of the first die member of the solid column or the second hollow column of the second die member. The plate-shaped member comes into contact with the first step groove along with the progress of, and as the solid pillar or the second hollow pillar progresses, each of the plate-shaped members becomes the first step groove. Gradually rotating toward at least a part of the peripheral wall of the solid pillar or the second hollow pillar while following the step groove of the solid pillar or the second hollow pillar. The inner wall of the first hollow column and the second step groove along at least a part of the peripheral wall of the hollow column. It is accommodated in a corresponding position, the molding apparatus.