WO2012017938A1 - Container and production method thereof - Google Patents

Abstract

Provided is a container capable of increasing its self-standing stability both in the filled state and in the volume reduction state. Disclosed is a substantially cylindrical container provided with a barrel portion which can be folded by a gusset, wherein the container is provided with a sheet-shaped bottom portion for closing a lower opening of the barrel portion in a substantially cylindrically opened state, and a peripheral portion of a sheet-shaped bottom structure body constituting the bottom portion is jointed to the lower end portion of a cylindrical barrel structure body which constitutes the barrel portion and can be folded by the gusset.

Description

Container and manufacturing method thereof

The present invention relates to a container suitable for use in housing solid materials such as liquids and powders such as beverages and liquid detergents, and a method for producing the same.

As a conventional container, it has a substantially cylindrical body part that can be folded by a gusset, and a bottom part that closes the lower opening of the body part, and is filled with contents and swelled to a certain shape (expanded) In the filled state, the bottom is unfolded so that it can stand on its own, and in the empty state where the contents are not accommodated, the bottom can be folded together with the trunk (for example, Japanese Patent Application Laid-Open No. 2002-2002). 284186).

The above-mentioned conventional container is provided with a crease so that the center side of the bottom part folded together with the body part protrudes to the outside (lower side) of the body part, so that the bottom part is developed so as to have a flat shape. However, the bottom portion tends to deform so as to protrude downward toward the center side. Such deformation leads to destabilization of the self-supporting state of the container, and the above-described tendency to cause this destabilization is when the container is reduced in volume from the filling state to the reduced volume state. Become prominent.

Furthermore, in the conventional container, a joint seal part (seal rib) is formed on the lower surface of the bottom part, and this joint seal part is a factor that further increases the instability.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a container capable of improving the self-supporting stability in both the filling state and the volume reduction state.

In order to achieve the above object, a container according to the present invention is a container having a substantially cylindrical shape that can be folded by a gusset, and is below the trunk portion in a state of being expanded into a substantially cylindrical shape. A sheet-like bottom part that closes the opening, has a peripheral part of the sheet-like bottom part constituting the bottom part, and a lower end part of the barrel part that can be folded by a gusset in a substantially cylindrical shape that constitutes the trunk part Are joined together (Claim 1).

In the container described above, the body part structure includes a body-side first folding line portion that extends in a substantially vertical direction and induces a convex bending outward, and a substantially bending inward that extends in a substantially vertical direction. A trunk side second fold line portion is provided so as to constitute the gusset, and the bottom structure body is arranged from a position linked to the trunk side first fold line portion toward a central portion of the bottom portion. A bottom-side first fold line portion that extends upward and protrudes a convex fold, and a downward-fold convex fold extends from a position linked to the trunk-side second fold line portion toward the center portion of the bottom portion. And a bottom-side second fold line portion for guiding is provided, and the bottom portion is folded along the gusset when the trunk portion is folded, and is folded inside the trunk portion. Good (claim 2).

The bottom part in a state in which the container is folded inside the lower part of the trunk part structure in a state of being folded by a gusset by guidance of the bottom first fold line part and the bottom second fold line part. Insert the structure so that the bottom side first fold line part enters the inside of the trunk side first fold line part one by one so that the central part of the bottom part structure faces forward The peripheral portion of the bottom structure may be joined to the lower end of the body structure with the bottom structure inserted in the lower part of the body structure in this way. (Claim 3) Further, in this case, above the left and right end portions of the joining region with respect to the peripheral edge portion of the bottom structure body at the lower end portion of the body structure body folded by the gusset, the body structure body Bonding areas where the inner surfaces are bonded are adjacent to each other and above these bonding areas Optionally has a generally boat shape continuous in (Claim 4).

Only the gusset located at the lower part of the trunk part structure is opened so that the container is in a state of being greatly expanded toward the lower end side at the lower part of the trunk part structure in a state folded by the gusset, and thus You may join the peripheral part of the said bottom part structure body with respect to the lower end part of this trunk | drum structure body of the state expanded. And in this case, the trunk structure has a regular polygon (n is an integer of 3 or more) having a cross section in an expanded state having n sides, and has a length of one side of the regular polygon. Folded at a position above the lower end of the trunk structure by a distance multiplied by 1 / (2 tan (180 ° / n)), the portion from the bent portion to the lower end of the trunk structure is The lower part may be in a state of being greatly expanded toward the lower end side (Claim 6). Alternatively, the body structure has a polygonal shape (n is an even number equal to or greater than 4) having a cross section in an expanded state and having lengths facing each other among the n sides. A pair of equal sides is longer than the other sides, and the lengths of the other sides are the same as each other, and the length of each of the other sides is 1 / (2 tan (180 ° / 180 °). n)) is folded at a position above the lower end of the trunk portion structure as a guide, and the portion from the folded portion to the lower end of the trunk portion structure is greatly expanded toward the lower end side as the lower portion. It may be in an opened state (claim 7).

The container is pushed in from the lower end side of the body part structure in an expanded state, and the bottom part body in a state where the container is expanded into a sheet larger than the lower end of the body part structure, In this case, the peripheral portion of the bottom portion structure bent along with the bottom portion may be joined along the lower end portion of the body portion structure (claim 8).

In the container, the upper part of the body portion may constitute a substantially cylindrical extraction portion with a closed end (claim 9). Further, the distance in the width direction between the adjacent cylinder-side first fold line portions may be non-uniform over the longitudinal direction (Claim 10), and in this case, the trunk structure is folded by a gusset. The other surfaces folded by the gusset are sandwiched between two non-surfaces, and the left and right widths of the two surfaces may be larger than the left and right widths of the other surfaces. Item 11).

On the other hand, a container manufacturing method of the present invention is a container manufacturing method for manufacturing a container according to any one of claims 1 to 8, wherein the sheet-like bottom structure constituting the bottom is formed. Joining of a peripheral part and the lower end part of the substantially cylindrical trunk | drum structure which comprises the said trunk | drum is performed by hot plate welding, high frequency welding, or ultrasonic welding (Claim 12).

A container manufacturing method of the present invention is a container manufacturing method for manufacturing a container according to any one of claims 1 to 8, wherein the container-side first fold line portion is adjacent to each other. In the body part structure in which the distance in the width direction of the body part is uniform over the longitudinal direction, the body part is arranged such that the distance in the width direction between the adjacent body side first folding line parts is non-uniform over the longitudinal direction. The inner surfaces of the gusset portions of the structure may be joined together (claim 13).

In the above-described container manufacturing method, the body structure is folded so that the other surface folded by the gusset is sandwiched between the two surfaces not folded by the gusset, and the left and right widths of the two surfaces are The width may be larger than the left and right widths of the other surface.

In the inventions according to claims 1 to 14, a container capable of improving the self-supporting stability in both the filled state and the reduced volume state, and a method for producing the same are obtained.

That is, in the container of the invention according to any one of claims 1 to 14, when the container is in a filled state (when the body part is expanded into a substantially cylindrical shape), the sheet-like bottom part is developed to have a shape that is nearly flat. By configuring as described above, it is possible to improve the self-supporting stability. In addition, when the container of the present invention is reduced from the filled state, even if the body portion in a state of being expanded into a substantially cylindrical shape is somewhat deflated, the deformation of the bottom portion in the deployed state is The bottom is less likely to be caused by pressure received from the contents of the container. Moreover, even when the container of the present invention is further deflated and the bottom portion is deformed, the deformation of the bottom portion is caused by the fact that the folds as described in claim 2 are provided at the bottom portion. Deformation of the bottom that makes the container's self-supporting posture unstable (for example, the central part of the bottom part advances outside the container rather than the peripheral part). Deformation) is less likely to occur. Therefore, according to the present invention, the self-supporting stability of the container in a reduced volume state can also be improved.

Further, in the container of the invention according to any one of claims 1 to 14, the container is filled by arranging the bottom part to be developed to a nearly flat shape when the body part is expanded into a substantially cylindrical shape. It is possible to easily increase the capacity.

Further, in the container of the invention according to claims 1 to 14, if the peripheral edge of the bottom structure and the lower end of the body structure are joined and then grounded, the self-supporting stability can be greatly improved. it can.

Further, in the inventions according to claims 5 to 7, 10, 11, 13, and 14, the body portion of the container can have various shapes.

In the invention according to claim 9, the mouth member is unnecessary, and the manufacturing cost can be reduced.

In the invention according to claim 12, suitable joining can be realized by appropriately selecting or combining hot plate welding, high frequency welding, and ultrasonic welding. Further, in the invention according to claim 12, for example, in a case where a portion folded in multiple by a gusset is to be bonded, a desired portion in the bonding target is reliably heated and welded by performing high-frequency welding using an internal heating method. It is possible to achieve a beautiful finish that suppresses the thermal influence (deterioration and expansion / contraction) on the surface of the welded portion and its periphery.

It is a disassembled perspective view which shows schematically the structure of the container which concerns on one embodiment of this invention. (A) And (B) is a perspective view which shows roughly the structure of the filling (expansion) state of the said container, and a folding state. FIG. 3 is a sectional view taken along line XX of FIG. (A) is a top view which shows schematically the structure of the modification of the bottom part structure of the said container, (B) is a perspective view which shows schematically the structure of the modification of the trunk | drum structure and the bottom part of the said container. It is. FIGS. 4A to 4D are explanatory views schematically showing steps in joining the body structure and the bottom structure shown in FIG. (A) is a longitudinal sectional view schematically showing the configuration of the mouth member of the container, and (B) is a longitudinal sectional view schematically showing the configuration of a modified example of the mouth member. It is explanatory drawing which shows roughly the structure of the opening of the said container in a folding state. (A) is explanatory drawing which shows schematically the structure of the other modification of the said opening member, (B) is explanatory drawing which shows schematically the mounting method different from the mounting method of the opening member with respect to the container main body shown in FIG. It is. It is a disassembled perspective view which shows schematically the structure of the modification which increased the seal rib of the said container. It is a disassembled perspective view which shows roughly the structure of the modification which forms the container main body of the said container from three members. (A) And (B) is a perspective view which shows roughly the structure of the filling (expansion) state of a container shown in FIG. 10, and a folding state. FIG. 12 is a cross-sectional view taken along line YY in FIG. It is a disassembled perspective view which shows roughly the structure of the modification which made the trunk | drum of the said container the substantially regular triangular cylinder shape. (A) is a top view which shows roughly the structure of the bottom part structure which is substantially equilateral triangle shape, (B) is the process at the time of joining the bottom part structure shown to (A) to a trunk | drum structure body schematically. It is explanatory drawing shown. It is a disassembled perspective view which shows roughly the structure of the modification which made the trunk | drum of the said container the substantially regular square cylinder shape. (A) is a top view which shows roughly the structure of the bottom part structure which is substantially square shape, (B) is the process at the time of joining the bottom part structure shown to (A) to a trunk | drum structure body schematically. It is explanatory drawing shown. It is a disassembled perspective view which shows roughly the structure of the modification which made the trunk | drum of the said container the substantially regular pentagonal cylinder shape. (A) is a top view which shows roughly the structure of the bottom part structure which is a substantially regular pentagon shape, (B) is the process at the time of joining the bottom part structure shown in (A) to a trunk | drum structure body schematically. It is explanatory drawing shown. It is a disassembled perspective view which shows roughly the structure of the modification which made the trunk | drum of the said container the hexagonal cylinder shape which is a non-regular hexagonal cylinder shape. (A) is a top view which shows roughly the structure of the bottom part structure which is a hexagon shape (non-regular hexagon shape), (B) is the process at the time of joining the bottom part structure shown to (A) to a trunk | drum structure. It is explanatory drawing which shows this roughly. It is explanatory drawing which shows roughly the structure of the welding apparatus used for joining of the trunk | drum structure shown in FIG. 4 (B) and a bottom part structure. It is explanatory drawing which shows roughly the modification of the seal die used in order to weld the opening peripheral part of a trunk | drum structure body to the upper surface of the protrusion part of a mouth member. (A) And (B) is explanatory drawing and top view which show schematically the structure of a cover member, (C) is a top view which shows schematically the modification of a cover member. It is explanatory drawing which shows roughly the structure of the container with which the cover member shown to FIG. 23 (B) was mounted | worn. It is a perspective view which shows roughly the structure of the upper part of the container which concerns on the modification which does not have a mouth member. It is explanatory drawing which shows roughly an example of the suitable high frequency welding method when there exists a level | step difference in a junction part. It is explanatory drawing which shows roughly the process of the modification of the joining method of a trunk | drum structure and a bottom part structure. FIG. 28 is an explanatory diagram schematically showing a process in a case where the joining method shown in FIG. 27 is applied to joining of a body part structure and a bottom part body having shapes different from those of the body part structure and the bottom part structure of FIG. 27. (A) And (B) is explanatory drawing and perspective view which show schematically the structure of the modification of the container shown in FIG.20 (B), (C) is a perspective view which shows the structure of another modification schematically. It is. (A) And (B) is a perspective view which shows roughly the structure of the modification of the container shown to FIG. 2 (A) and (B), respectively. It is a perspective view which shows roughly the modification of the joining method shown in FIG.

1 container body 2 mouth member (spout)
DESCRIPTION OF SYMBOLS 3 Body part 4 Shoulder part 5 Bottom part 7 Body side 1st fold line part 8 Body side 2nd fold line part 9a Cushion part 13 Opening 14 Bottom 1st fold line part 15 Bottom 2nd fold line part 16 Body part 17 Bottom part 18 Cylindrical film 22 Cylindrical part 23 Projection part 30 Annular member (annular film)

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 2 (A) and 3, a container according to an embodiment of the present invention is mounted on a container main body 1 for storing contents such as beverages and an upper portion of the container main body 1, and the container main body 1 is provided with a mouth member (hereinafter referred to as spout) 2 for leading the contents contained in 1 to the outside.

As shown in FIGS. 1, 2 (A) and 3, the container main body 1 is provided on the lower side of the trunk portion 3, the shoulder portion 4 connected to the upper side of the trunk portion 3, and the lower side of the trunk portion 3. 2 and can be folded as shown in FIG. 2 (B).

The body portion 3 has a substantially regular hexagonal shape in cross section, and has a substantially regular hexagonal cylindrical shape (cylindrical shape with a substantially regular hexagonal cross section) having six side surfaces 6 that are substantially identical to each other. In addition, in order to enable folding as shown in FIG. 2B, the body 3 has outer sides along six sides extending in the substantially vertical direction of the body 3 (the axial direction of the body 3). A trunk-side first fold line portion 7 for guiding a fold that is convex in the direction (mountain fold) is provided, and the center of each of two pairs of side surfaces 6 facing each other among the six side surfaces 6 is A trunk side second folding line portion 8 is provided which extends in a substantially vertical direction (axial direction of the trunk portion 3) and induces an inwardly convex fold (valley fold) (FIGS. 1 and 2A). reference). That is, a total of six trunk-side first fold line sections 7 and a total of four trunk-side second fold line sections 8 have a total of four side gussets 19 that enable folding of the trunk section 3 (FIG. 2 ( B) is provided on the left and right sides of the body part 3, and each side gusset 19 is folded inward to the approximate center of the body part 3 when the body part 3 is folded. become.

Moreover, as shown in FIG. 1, FIG. 2 (A) and (B), the outer side of one trunk | drum side 1st fold line part 7 of the trunk | drum 3 is along the trunk | drum side 1st fold line part 7. As shown in FIG. A protruding seal rib 9 is provided.

As shown in FIGS. 1 and 2A, the shoulder portion 4 has a substantially regular hexagonal shape in plan view. As shown in FIG. 2B, the shoulder portion 4 can be folded together with the trunk portion 3 and is folded to the outside (upper side) of the trunk portion 3 at this time. As shown in FIG. 1, the portion 4 is provided with a total of six shoulder-side first fold line portions 10 and a total of four shoulder-side second fold line portions 11. Here, each shoulder side 1st fold line part 10 is toward the center part of the shoulder part 4 from the position which cooperates with each trunk | drum 1st fold line part 7 of the trunk | drum 3 in the shoulder part 4. It is configured to extend and guide an upward convex fold (mountain fold). Further, each shoulder-side second fold line portion 11 extends from the position where the shoulder portion 4 is linked (contacted) with each trunk-side second fold line portion 8 toward the center portion of the shoulder portion 4 and protrudes downward. It is comprised so that bending (valley fold) may be induced | guided | derived.

Further, on the outside of one shoulder side first fold line portion 10 of the shoulder portion 4, along the shoulder side first fold line portion 10, as shown in FIGS. An extending seal rib 12 is projected.

Furthermore, as shown in FIG. 1, a substantially circular opening 13 for mounting the spout 2 is provided in the central portion of the shoulder 4.

The bottom portion 5 has a sheet shape that closes the lower opening of the body portion 3 in a state of being expanded in a substantially cylindrical shape, and the plan view shape of the bottom portion 5 is a substantially regular hexagonal shape as shown in FIG. ing. Then, as shown in FIG. 2 (B), the bottom 5 is folded along the side gusset 19 of the trunk 3 and folded inside the trunk 3 when the trunk 3 is folded. Therefore, as shown in FIG. 1, the bottom 5 is provided with a total of six bottom-side first fold line portions 14 and a total of four bottom-side second fold line portions 15. . Here, each bottom-side first fold line portion 14 extends from a position where the bottom portion 5 is linked (contacted) with each trunk-side first fold line portion 7 of the trunk portion 3 toward the center portion of the bottom portion 5. It is configured to induce an upward convex fold (mountain fold). Further, each bottom-side second fold line portion 15 extends from a position where the bottom portion 5 is linked (contacted) with each trunk-side second fold line portion 8 toward the center portion of the bottom portion 5, and has a downwardly convex fold. It is configured to induce a song (valley fold).

Next, the manufacturing method of the container will be described with reference to a more specific configuration of the container.

As shown in FIG. 1, the container main body 1 is composed of two members, ie, a body part 16 constituting the body part 3 and a bottom part body 17 constituting the bottom part 5, and the body part 16 is a shoulder part 4. The site | part which comprises is also included.

(1) The body structure 16 is formed by, for example, folding a sheet of flexible film having a continuous planar shape into a tubular film obtained by joining both left and right ends with a joint seal. It can be formed by processing such as gusset folding or trimming (cutting) that forms the tatami- line portions 7, 8, 10, and 11. And the joint seal part formed at this time turns into the seal rib 9 shown to FIG. 1, FIG. 2 (A) and (B).

Moreover, the film used for the trunk | drum structure 16 is the laminated film comprised by laminating | stacking the film which makes a base material layer, the film which makes a sealant layer, etc., for example, Comprising: The trunk | drum 3 and the shoulder part 4 are formed. In this state, the sealant layer is positioned on the innermost surface side of the body portion 3 and the shoulder portion 4. In addition, as a film used for the trunk | drum structure 16, the film which makes a gas barrier layer may be laminated | stacked according to the contents (accommodation object) of a container, In this way, the film used for the trunk | drum structure 16 is used. The determination and selection of the configuration of each layer and the combination thereof may be performed as appropriate in consideration of heat sealing suitability, content resistance, sealing properties, and the like.

(2) Subsequently, as shown in FIG. 1, the body part 16 is opened (expanded), the spout 2 is inserted into the body part 16 from the lower opening side, and the cylindrical part of the spout 2 22 is projected from the opening 13.

That is, as shown in FIGS. 1 and 3, the spout 2 is connected to the cylindrical portion 22 through the opening 13 and the cylindrical portion 22, and extends from the cylindrical portion 22 to the outside of the cylindrical portion 22. It has the protrusion part 23 extended. A screw part 22a (see FIG. 3) to which the lid 24 is detachably attached is provided on the upper part of the cylindrical part 22.

Further, while the cylindrical portion 22 is configured to be able to be inserted into the opening 13, the protruding portion 23 is configured to abut against the periphery of the opening 13 so as not to pass through the opening 13. And this protrusion part 23 is provided in a row by the lower end part of the cylindrical part 22, for example, the protrusion width | variety is 3 mm or more, and the upper surface is extended substantially horizontally.

(3) With the cylindrical part 22 of the spout 2 protruding from the opening 13 to the outside of the body part structure 16, the peripheral part of the opening 13 of the body part body 16 is the upper surface (seal surface) of the protrusion part 23. In order to perform welding, a sealing process (for example, heat sealing such as hot plate welding) is performed.

Here, as shown in FIG. 6A, since a plurality of convex portions (annular protrusions in the illustrated example) 25 are provided on the upper surface of the protruding portion 23, the peripheral portion of the opening 13 is welded to the upper surface of the protruding portion 23. The accuracy will be greatly improved. And the spout 2 is shape | molded by resin (for example, thermoplastic resins, such as a high density polyethylene) for enabling the said welding. The convex portion 25 is shown only in FIGS. 6A and 6B, and is omitted in other drawings.

(4) The periphery of the bottom structure 17 is joined to the lower end of the body structure 16 to which the spout 2 is attached.

Here, as shown in FIG. 1, the bottom structure 17 has a total of six joint allowances 26 that are suspended from the periphery (six sides) of a substantially regular hexagonal portion constituting the bottom 5. Note that the adjacent joint allowances 26 may be connected or separated.

Then, each joint allowance 26 of the expanded bottom structure 17 is bonded to the lower part of the expanded body structure 16 (for example, so that the bottom 5 closes the lower opening of the body 3). Heat seal such as hot plate welding). That is, the lower part of the trunk part structure 16 is used as the joining allowance 27 (see FIG. 3).

And the joining width w (see FIG. 3) of the joining allowance 27 of the body part constituting body 16 and the joining allowance 26 of the bottom part constituting body 17 can be set to 5 mm or more, for example. Further, as shown in FIG. 3, the lower end of the joining allowance 26 and the lower end of the joining allowance 27 may be substantially coincident, but the joining allowance 26 is at a position slightly above and below the position shown in FIG. It may be joined.

The bottom structure 17 can be the same as the film used for the body structure 16 or a laminated film applicable to this film. In this embodiment, the film used for the bottom structure 17 is: In a state where the bottom portion 5 is formed, the sealant layer is configured to be positioned on the uppermost surface side of the bottom portion 5.

This completes the manufacturing method of the container.

In the present container obtained by the above manufacturing method, the degree of freedom of the container shape is improved by joining the protruding portion 23 of the spout 2 and the peripheral portion of the opening 13 of the container body 1, and the container body 1 has a three-dimensional shoulder. Since the portion 4 can be provided, in addition to being able to easily increase the filling capacity, it is possible to arrange a plurality of containers without leaving a gap between the containers as in general PET bottles, Space saving and handling convenience will be excellent.

Moreover, in this container, when the trunk | drum 3 is expanded in the substantially cylindrical shape, since it expand | deploys so that the bottom part 5 may become a shape close | similar to flat, this can also attain the increase in filling capacity easily. Further, unlike the conventional container, no rib is formed on the bottom surface. Therefore, the bottom portion 5 can be easily developed, and the self-supporting stability in the filled state (expanded state) can be enhanced.

Moreover, when the bottom portion 5 is deformed as the container is somewhat deflated from the filled state, this deformation is caused by the folding folds (bottom side first and second folding line portions 14, 15) provided on the bottom portion 5. ), The center part of the bottom part 5 is retracted to the inside of the container (body part 3), and the bottom part 5 is deformed so as to make the container's self-supporting posture unstable (for example, the central part of the bottom part 5). (Deformation that advances to the outside of the container rather than the peripheral portion) is less likely to occur, so that the self-supporting stability of the volume-reduced container is also increased.

Furthermore, since the joint margin 26 at the periphery of the bottom portion 5 and the joint margin 27 at the lower end periphery of the trunk portion 3 are grounded, this container makes it very difficult to ground the central portion of the bottom portion 5 and is extremely excellent in self-supporting stability. It will be.

Further, the body 3 of the container has a substantially regular hexagonal cylindrical shape, and the self-standing stability and shape retention of the container are improved by the seal rib 9 provided along one side extending in the vertical direction in the body 3. Will do.

By the way, in this container, the trunk | drum structure body 16 of the container main body 1 is comprised from six surfaces, and each surface extends from the opening 13 to the bottom of the container main body 1, and two pairs of surfaces which mutually oppose among these six surfaces are each. A gusset portion 19 is provided (see FIGS. 2A and 2B). And the upper part of the container main body 1 of the state folded so that the gusset part 19 might be folded inward, as shown in FIG. 7, the substantially arc-shaped opening edge 21 which comprises the edge of the opening 13, and this opening It is configured to have a line (inner line of the seal rib 12) 28 that is connected to the left and right of the edge 21 and forms the shoulder portion 4. As shown in FIG. 7, when the distance in the width direction between the adjacent lines 28 is made narrower toward the upper end side, the sealing accuracy at the time of neck sealing can be improved, and the shoulder 4 of the main container after manufacture can be improved. It is preferable that interference with the human body or the like due to the seal rib 12 existing in the above can be reduced and eliminated.

In order to allow the cylindrical portion 22 to be inserted into the opening 13 in the step (2), the opening edge 21 is centered on the intersection P of the extension lines of the left and right lines 28 as shown in FIG. What is necessary is just to comprise so that it may be located in the outer side of the circle C when the circle C which has the largest outer diameter of the cylindrical part 22 is drawn. In this example, in the step (1), by forming the opening edge 21 along the circle C ′ having a diameter slightly larger than the maximum outer diameter of the cylindrical portion 22 with the intersection P as the center, the step ( In 3), when the cylindrical portion 22 is inserted into the opening 13, a slight gap is formed between the cylindrical portion 22 and the opening 13 to facilitate the operation of inserting the cylindrical portion 22. Here, the diameter of the circle C ′ may be appropriately determined within a range in which the protruding portion 23 can abut against the periphery of the opening 13 and cannot pass through the opening 13. If the length is 102 to 140% (preferably 105 to 112%), the cylindrical portion 22 can be easily inserted into the opening 13 and the peripheral portion of the opening 13 is securely welded to the upper surface of the protruding portion 23. be able to.

It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the gist of the present invention. For example, the following modifications can be given.

The container of the above-described embodiment has a configuration suitable for use as a sealed container, but is not limited to this and may be a container that is not sealed. The container of the above embodiment is a kind of standing pouch, but is not limited to this and may be a paper container or the like.

That is, paper or the like may be used as the material of the body part structure 16 and the bottom part structure 17 in addition to the synthetic resin film. In addition, the trunk | drum structure 16 and the bottom part structure 17 may consist of the same material, and may consist of a dissimilar material. What is necessary is just to determine a material.

In the above embodiment, the joining allowance 27 of the trunk part constituting body 16 and the joining allowance 26 of the bottom part constituting body 17 are joined so as to hang down together (see FIG. 3). Further, the joining margins 26 and 27 may be joined together so as to be expanded toward the outside of the body part structure 16, and in this case, the bottom part body 17 extends substantially flat over the whole. become.

In the above-described embodiment, the unfolded bottom structure 17 is joined to the unfolded body structure 16 (see FIG. 1). For example, FIGS. 4 (A) and 4 (B). As shown in FIG. 4, instead of the trunk structure 16 and the bottom structure 17, the trunk structure 16 ′ and the bottom structure 17 ′ are used to join the trunk structure 16 ′ and the bottom structure 17 ′. You may make it carry out in the state which folded both 16 'and 17' (strictly expanded or unfolded from the folded state).

That is, as shown in FIG. 4 (B), the body portion structure 16 ′ is provided with slits 18 at the lower ends of the sides extending vertically in the body portion structure 16 shown in FIG. It has a configuration in which a non-sealed portion (portion that is not joint-sealed) 9 'is provided on the lower side. Further, as shown in FIG. 4A, the bottom component 17 ′ is similar to the bottom 5 larger than the bottom 5 shown in FIG. 1 by omitting the joining margin 26 from the bottom component 17 shown in FIG. It has a shape.

And in order to join trunk | drum structure 16 'and bottom part structure 17', as shown to FIG. 4 (B) and FIG. 5 (A), each trunk | drum side 1st of trunk | drum structure 16 'is shown. While folding one folding line part 7 and folding each trunk | drum side 2nd folding line part 8 trough and folding the trunk | drum 3, each bottom side 1st folding line 14 of bottom part structure 17 '. Are folded, and each bottom-side second fold line portion 15 is valley-folded to fold the bottom structure 17 '.

Subsequently, the bottom structure 17 ′ in a state of being folded by the guidance of the folding line portions 14 and 15 (strictly in a state of being slightly expanded from the folded state) is folded by the guidance of the folding line portions 7 and 8. The mountain folds of the bottom component 17 ′ enter one by one inside the lower part of the body part 3 in a slender state (strictly expanded from the folded state), inside the mountain fold part of the body part 3. While fitting (fitting), the bottom portion structure 17 ′ is inserted so that the center portion faces forward (see FIG. 5B).

This insertion is performed until each bottom-side first fold line 14 of the bottom portion structure 17 ′ comes into contact with the upper edge of each slit 18 of the body portion structure 16 ′, and thereafter, as shown in FIG. Both 16 'and 17' are joined by a sealing process. Here, the hatched portion in FIG. 5C is the seal portion, and the width in the vertical direction of this seal portion is approximately equal to the joint width w (see FIG. 3) of the joint allowances 26 and 27. can do.

Here, when both the constituent members 16 'and 17' in the folded state are joined as shown in FIG. 5C, the sealing process for this joining is performed on a portion where as many as twelve films are superimposed. Will be done. Therefore, hot plate welding and high frequency welding using the welding apparatus shown in FIG. 21 are suitable for such a sealing treatment method. That is, the body structure 16 ′ and the bottom structure 17 ′ are sandwiched between two seal bars 36 heated to a predetermined temperature (for example, 100 to 150 ° C.) at a predetermined pressure and time (for example, 1-4 seconds). Two electrodes in a state in which both components 16 'and 17' are sandwiched under a predetermined condition (desired current value (for example, 0.2-0.8A), welding time (energization time)) while pressing High frequency power is supplied to 37a and 37b. According to such a sealing treatment method, an external heating type hot plate welding and an internal heating type high frequency welding can be efficiently heated from the inside and outside even in a region where as many as 12 films are overlapped. Can be applied. In place of such welding, ultrasonic welding or infrared laser welding can be performed, or only high-frequency welding can be performed without performing hot plate welding.

Finally, the portion of the bottom structure 17 'that protrudes from the body structure 16' is cut out (see FIG. 5D). As described above, the joining of the body structure 16 'and the bottom structure 17' is completed, and the lower end of the body structure 16 'and the peripheral edge of the bottom structure 17' are joined.

Thus, when using trunk | drum structure body 16 'and bottom part structure body 17', as shown to FIG.5 (C) and (D), the trunk | drum 3 of the folded state (trunk body structure body 16 '). The lower end portion 7a of the trunk side first fold line portion 7 is located above the lower end portion 7a in the trunk side first fold line portion 7 (leftward in FIGS. 5C and 5D). Rather than the lower end 7a of the folded body portion 16 'located in the center of the folded body portion 3 in the left-right direction (vertical direction in FIGS. 5C and 5D). The portion located below (to the right in FIGS. 5C and 5D) is joined over the inner surface of the trunk structure 16 ′ and the upper surface of the bottom structure 17 ′. That is, the inner surfaces of the trunk portion structure 17 'are joined to the lower end of the trunk portion structure 16' in the folded state by the gussets above the left and right ends of the joining area with respect to the peripheral edge portion of the bottom portion structure 17 '. The joining regions are adjacent to each other, and the upper edges of these joining regions are connected to form a substantially boat shape (see FIGS. 5C and 5D).

Here, as is apparent from the above description, the bottom structure 17 ′ has a part that is finally cut off, and the shape of the part can be appropriately changed. Further, part or all of the portion of the bottom portion structure 17 ′ that protrudes from the trunk portion structure 16 ′ may be left without being cut.

The upper surface of the protrusion 23 does not extend substantially horizontally, and may have a tapered shape that spreads downward as shown in FIG. As a taper angle in this case, an angle in a range of 20 ° or less greater than 0 ° can be employed, assuming that the case of extending in the horizontal direction is 0 °. In addition, examples of the shape of the projecting portion 23 in this case include a truncated cone shape (a round bowl shape) and a truncated pyramid shape (a square bowl shape). When the upper surface of the projecting portion 23 is tapered, when the spout 2 is inserted into the opening 13 in the step (2), the spout 2 is guided by the tapered surface, and the positioning becomes easy. ) In the sealing process can be improved.

Moreover, although the some convex part 25 (refer FIG. 6 (A) and (B)) provided in the upper surface of the protrusion part 23 was concentric with each other, it is not restricted to this, For example, it becomes an iris shape or a diamond shape. Furthermore, each convex portion 25 is not limited to the annular protrusion, and may have another shape.

Further, instead of or in addition to the configuration in which the plurality of convex portions 25 are provided on the upper surface of the projecting portion 23, as shown in FIG. 22, the peripheral portion of the opening 13 of the trunk structure 16 on the upper surface of the projecting portion 23. A configuration may be adopted in which a circumferential irregularity (in the illustrated example, a plurality of annular grooves) 39 is provided on the front end surface of the seal die 38 used for welding. Also in this case, a plurality of convex portions 25 (see FIGS. 6A and 6B) are formed on the peripheral portion of the opening 13 by the unevenness 39 of the seal die 38, and the peripheral portion of the opening 13 with respect to the upper surface of the protruding portion 23 The welding accuracy is greatly improved, and the beauty is also improved. In addition, the shape of the unevenness | corrugation 39 can be made into the shape similar to the convex part 25 (a concentric shape, a iris shape, etc.).

The sealing process in the above steps (1), (3), and (4) is not limited to hot plate welding, for example, a method of performing hot plate welding and high frequency welding in combination using the above-described welding apparatus shown in FIG. Alternatively, ultrasonic welding, infrared laser welding, or the like may be performed, or only high-frequency welding may be performed without performing hot plate welding.

Here, when high-frequency welding is selected as the seal processing method in the step (2) (including not only high-frequency welding but also high-frequency welding and hot plate welding are performed in combination), as shown in FIG. In order to weld the peripheral portion of the opening 13 of the body structure 16 to the upper surface of the portion 23, two electrodes 37a and 37b to which high-frequency power is supplied (in the illustrated example, the electrode 37a is formed by connecting the cylindrical portion 22 of the spout 2). The electrode 37b has a shape that can be close to the inner surface side of the cylindrical portion 22 and the lower surface side of the protrusion portion 23). What is necessary is just to clamp the opening 13 peripheral part of the trunk | drum structure body 16. FIG. However, in this case, if the seal rib 12 is present on the upper surface side of the peripheral portion of the opening 13 of the body part structure 16, a step (or unevenness) caused by the seal rib 12 causes a spark.

Therefore, in the case where such a step occurs, that is, a surface that includes a step (a top surface of the periphery of the opening 13 of the body portion structure 16) is included in the joint portion sandwiched between the two electrodes 37a and 37b. As shown in FIG. 26, the surface may be covered with a cushion material (an annular sheet body made of silicon rubber in the illustrated example) c for eliminating the level difference. That is, in the example shown in FIG. 26, when the projecting portion 23 and the peripheral portion of the opening 13 of the body structure 16 are sandwiched by the two electrodes 37 a and 37 b, the cushion material c is sealed by the seal rib 12. In other words, it is deformed so as to absorb the level difference generated on the upper surface of the peripheral portion of the opening 13 (see the virtual line). Therefore, it is possible to reliably and satisfactorily perform high-frequency welding without generating sparks.

The method using the cushion material c as described above is, for example, when the number of gussets formed on the body structure 16 ′ and the bottom structure 17 ′ in the folded state is different on the left and right (FIG. 14B described later). ), FIG. 18 (B)), or when there is a relatively large gap between the left gusset and the right gusset respectively formed on the body structure 16 ′ and the bottom structure 17 ′ in the folded state. (See FIG. 20B, which will be described later) This is also preferable because the above-described step is generated.

In addition, when the cushion material c is coated on a surface where a step (or unevenness) occurs, one surface side is in close contact with the step (unevenness), and the other surface side is flexible and thick enough to be a substantially smooth surface (for example, In addition to the silicon rubber described above, for example, release paper or the like can be used as the cushion material c.

In the above step (1), a planar continuous film is sealed with a palm and sealed into a cylindrical shape, and further processed to form the body component 16, but not limited to this, for example, from the beginning One body formed into a cylindrical shape may be processed (bonded or the like) to form the body portion structure 16, or a plurality of film bodies may be processed (bonded or the like) to form the body portion structure 16. May be.

In the above step (3), the protruding portion 23 of the spout 2 is joined to the container body 1, but the protruding portion 23 may not be provided on the spout 2, and in this case, as shown in FIG. What is necessary is just to provide the container main body 1 with the cylindrical part 29 for joining (welding) to the outer peripheral surface of the 2 cylindrical part 22. FIG. In this case, if a plurality of convex portions (annular projections 30 in this embodiment) 30 as shown in FIGS. 6A and 6B are provided on the outer peripheral surface of the cylindrical portion 22, The welding accuracy of the container body 1 with respect to the outer peripheral surface is greatly improved.

In the above steps (2) and (3), the spout 2 is directly attached to the container body 1. However, the present invention is not limited to this. For example, as shown in FIG. After an annular film (an example of an annular member) 31 provided in a sheet shape so as to surround the proximal end of the cylindrical portion 22 is joined to the upper surface side of the protruding portion 23, the upper surface of the annular film 31 is connected to the container body 1 You may make it join to the lower surface of the opening 13 peripheral part. In this case, even if the diameter of the opening 13 of the container main body 1 is larger than the diameter of the protrusion 23 of the spout 2, the spout 2 can be reliably attached to the container main body 1. In addition, by making the annular film 31 the same material as the container main body 1, the spout 2 can be attached to the container main body 1 better and reliably.

Here, in order to carry out the mounting shown in FIG. 8 (B), the film used for the body component 16 of the container body 1 has the sealant layer S1 on the innermost surface side, whereas the film is annular. It is necessary to provide the sealant layers S2 and S3 on both the uppermost surface and the lowermost surface of the film 31. 8A, when the spout 2 does not have the protruding portion 23, for example, a portion (not shown) joined to the outer peripheral surface of the cylindrical portion 22 of the spout 2 is used. What is necessary is just to provide in the cyclic | annular film 31.

After the step (4), the seal ribs 9 and 12 are tilted so as to be along the outer surface of the container body 1, and the side surfaces of the seal ribs 9 and 12 and the outer surface of the container body 1 are joined so as to maintain this state. A joining step may be provided. In this case, the entire surfaces of the seal ribs 9 and 12 may be joined to the outer surface of the container body 1 in a line shape. Moreover, this joining process can be performed by, for example, hot plate welding or ultrasonic welding, and by adhering the seal ribs 9 and 12 to the outer surface of the container body 1, the rib effect is enhanced, and the strength (shape retention) of the container body 1 is increased. Improved).

Further, in place of or in addition to the joining step, as shown in FIGS. 23A and 23B, the annular cover member 40 is pressed against the upper end portion (tip portion) of the seal rib 12. You may provide the cover process joined along the periphery of the opening 13 of the container main body 1 so that it may become. In this case, the cover member 40 can press the upper end portion of the seal rib 12 at the periphery of the opening 13 of the container main body 1 so as not to stand up, and further cover it. As a result, the aesthetic appearance of the container can be improved. The cover member 40 may be formed of a resin that can be bonded to the periphery of the opening 13 of the container body 1, for example.

Further, in this case, as shown in FIGS. 23 (C) and 24, a hanging curtain-like portion 41 may be continuously provided on the annular cover member 40. For example, the advertisement / advertisement of a product is printed on the hanging curtain-like portion 41. If so, you can increase your appeal. In addition, since it is considered that the banner 41 is unnecessary for the consumer who has purchased the product, the cover member 40 and the banner 41 can be easily separated from the cover member 40. A weakening line 42 (see FIG. 23C) may be provided at the boundary. Here, FIG. 24 shows a state in which the shoulder 4 is inclined so as to be lowered toward the outside rather than horizontal, but when the cover member 40 is provided, the shoulder 4 is inclined in this way. It is more effective to improve the aesthetics of the container.

In the above embodiment, only one seal rib 9 is provided, but a plurality of seal ribs 9 may be provided. For example, as shown in FIG. 9, on the outer side of each side (six sides) extending in the substantially vertical direction of the body part 3. The same may be said of the seal rib 12. Further, the seal ribs 9 and 12 may not be provided at all. When two or more seal ribs 9 are provided, the container body 1 is formed using a method similar to the joining method described with reference to FIGS. 4 (A) and 4 (B) and FIGS. 5 (A) to 5 (C). In this case, a plurality of (same number) seal ribs 9 and non-seal portions 9 ′ positioned below the body structure 16 ′ shown in FIG. (Not shown) may be used.

The container of the above embodiment has one feature in the configuration of the bottom portion 5 that can improve the self-supporting stability. Therefore, the upper portion of the trunk portion 3 and the spout 2 are deformed in various ways within a range not impairing this feature. For example, the spout 2 may not be provided, and the container main body 1 itself may be configured to have a content outlet.

Specifically, as shown in FIG. 25, the upper part (or shoulder part 4) of the body part 3 is deformed so as to constitute a substantially cylindrical extraction part (neck part) 43 whose tip is closed. Can be considered. In FIG. 25, reference numeral 44 denotes a seal portion provided at the tip of the extraction portion 43, and the seal portion 44 may be provided with a cut (not shown) that facilitates opening of the container.

Further, the body structure body 16 and the bottom body structure body 17 constituting the container body 1 are not limited to separate bodies, and may be integrated, and a part of the bottom body structure body 17 is a part of the body section 3. It is possible to change the configuration. That is, in the container of this example, as shown in FIG. 3, the joining margin 26 is provided so as to hang down from the periphery of the bottom 5, but conversely, it may be provided so as to extend upward from the periphery of the bottom 5. In this case, the joining margin 26 which is a part of the bottom structure 17 constitutes the lower part of the body 3.

Further, the container body 1 may be composed of three or more members. For example, as shown in FIGS. 10 to 12, the body 3 and the shoulder 4 constituting the container body 1 are separated, that is, the body structure 32 and the shoulder 4 constituting the body 3. Can be separated from the shoulder structure 33. Here, the trunk part structure 32 shown in FIG. 10 has a configuration corresponding to the trunk part structure 16 shown in FIG. 1 with the portion constituting the shoulder part 4 removed, and the shoulder part shown in FIG. The structure 33 has a structure corresponding to the bottom structure 17 shown in FIG.

The attachment of the spout 2 to the shoulder structure 33 shown in FIG. 10 can be performed in the same manner as the attachment of the spout 2 to the trunk structure 16 shown in FIG. 10 to 12, the seal rib 12 is not provided on the shoulder 4, but the seal rib 12 may be provided on the shoulder 4. Furthermore, in the example shown in FIGS. 10 to 12, when the body part 3 is folded, the shoulder part 4 is folded out (upward) of the body part 3 as shown in FIG. When the portion 3 is folded, the shoulder portion 4 may be folded inside the trunk portion 3, and for that purpose, the shoulder side second portion is provided at a position where each shoulder side first fold line portion 10 is provided. What is necessary is just to provide the fold line part 11 and to provide the shoulder side 1st fold line part 10 in the position where each shoulder side 2nd fold line part 11 is provided.

Further, in the example shown in FIGS. 10 to 12, the shoulder portion structure 33 has a total of six joint margins 34 joined to the upper portion of the trunk portion body 16, and each joint margin 34 is a peripheral edge of the shoulder portion 4. However, each joint allowance 34 may be provided so as to hang down from the peripheral edge of the shoulder portion 4.

Further, in the example shown in FIGS. 10 to 12, a seal rib 9 extending along the trunk side first fold line portion 7 is provided on the outside of each trunk side first fold line portion 7 of the trunk portion 3. In addition, a cushion portion 9 a having a loop shape in a cross-sectional view is formed at the protruding end of each seal rib 9. And by this cushion part 9a, the touch when holding the trunk | drum 3 can be made favorable.

It should be noted that a portion corresponding to the cushion portion 9a can be provided on the seal rib 12 shown in the above embodiment and the like.

In the above embodiment, as shown in FIG. 1 and the like, the bottom portion 5 is configured to have a substantially regular hexagonal shape corresponding to the body portion 3 having a substantially regular hexagonal cylindrical shape. First, the body portion 3 is formed in a substantially regular polygonal tube shape (a tube shape whose cross section is a substantially regular polygon shape) other than a substantially regular hexagonal tube shape, and the bottom portion 5 has sides corresponding to the shape (number of faces) of the body portion 3. It can comprise so that it may become a substantially regular polygon shape.

For example, as shown in FIG. 13, when the body portion 3 has a substantially regular triangular cylindrical shape (a cylindrical shape whose cross section is a substantially regular triangle), the bottom portion 5 may be a substantially regular triangular shape. A method similar to the method described in the above step (4) is to join the body structure 16 having the shoulder 4 having a substantially equilateral triangle shape in plan view and the bottom structure 17 having a total of three joint allowances 26. The container main body 1 can be obtained. Instead of this joining method, a method similar to the joining method described with reference to FIGS. 4A and 4B and FIGS. 5A to 5C may be used. 14 (A) and 14 (B) may be used as the body structure 16 ′ and the bottom structure 17 ′. FIG. 14B shows a step corresponding to the step shown in FIG.

Further, as shown in FIG. 15, when the body portion 3 has a substantially square tube shape (a tube shape whose cross section is a substantially square shape), the bottom portion 5 may have a substantially regular square shape. The method similar to the method described in the above step (4) is to join the trunk structure 16 having the shoulder 4 having a substantially square shape in plan view and the bottom structure 17 having a total of four joint allowances 26. The container main body 1 can be obtained. Instead of this joining method, a method similar to the joining method described with reference to FIGS. 4A and 4B and FIGS. 5A to 5C may be used. The trunk part structure 16 ′ and the bottom part structure 17 ′ shown in FIGS. 16A and 16B may be used. Note that FIG. 16B shows a step corresponding to the step shown in FIG.

In addition, as shown in FIG. 17, when the body portion 3 has a substantially regular pentagonal shape (a tubular shape whose cross section is a substantially regular pentagonal shape), the bottom portion 5 may have a substantially regular pentagonal shape. A method similar to the method described in the above step (4) is to join the body structure 16 having the shoulder 4 having a substantially regular pentagonal shape in plan view and the bottom structure 17 having a total of 5 joint allowances 26. The container main body 1 can be obtained. Instead of this joining method, a method similar to the joining method described with reference to FIGS. 4A and 4B and FIGS. 5A to 5C may be used. 18A and 18B, the trunk structure 16 ′ and the bottom structure 17 ′ may be used. Note that FIG. 18B shows a step corresponding to the step shown in FIG.

As can be understood from the above description, when the body portion 3 has a substantially regular n-square cylindrical shape (a cylindrical shape whose cross section is a substantially regular n-square shape) (n is an integer of 3 or more), the bottom portion 5 is substantially regular. The n-shaped shape may be used, and the configuration of each part when n is 7 or more can be determined in the same manner as when n is 3 to 6. That is, the trunk side first fold line part 7 of the trunk part 3 is provided at substantially equal intervals in the circumferential direction of the trunk part 3, and the trunk side second fold line part 8 is folded on the n-plane of the trunk part 3. It is not necessary to provide it on the surface that cannot be folded, and it is only necessary to provide it on the surface to be folded (the surface to be folded). Thus, the site | part which provides the trunk | drum side 1st, 2nd fold line part 7 and 8 inevitably becomes settled. In addition, the bottom side first and second fold line portions 14 and 15 are located from the position (contact position) linked to the trunk side first and second fold line portions 7 and 8 to the center portion of the bottom portion 5 (more specifically, Therefore, the portions where the bottom side first and second fold line portions 14 and 15 are provided are inevitably determined.

As described above, it is easy to maintain a balance in a self-supporting posture by making the body 3 a substantially regular polygonal cylinder (a cylinder whose cross section is a substantially regular polygon) and the bottom 5 is a substantially regular polygon. This is preferable in terms of improving stability.

However, for example, when n is an even number of 4 or more, the body portion 3 can be an n-square tube shape that is a non-regular polygon tube shape, and the bottom portion 5 can be an n-corner shape that is a non-regular polygon shape.

That is, when n is an even number of 4 or more, the bottom portion 5 can also have an n-corner shape (non-regular polygon shape) in which a pair of opposite sides are longer than other sides having the same length ( 19 and FIG. 20A), in this case, the body 3 is an n-square tube that is not a regular polygonal tube (see FIG. 19), and is not folded between the n surfaces constituting the body 3. The pair of opposed surfaces are folded and become wider than other surfaces having the same width. In this case, as shown in FIG. 20 (A), two vertices 35a and 35b are provided in the central portion of the bottom portion 5, and the bottom side first and second folding line portions 14 and 15 of the bottom portion 5 are , Respectively, extend from the position (position in contact) associated with the body side first and second folding line portions 7 and 8 toward the closer of the two vertices 35a and 35b. Here, the two vertices 35a and 35b are located at the center (center of gravity) of the bottom 5 by a half of the difference in length between the pair of sides longer than the other sides of the sides of the bottom 5 and the other sides. ) In a position away from P in directions opposite to each other and in a direction substantially parallel to the pair of sides longer than the other sides. In FIGS. 19, 20A and 20B, the case where n is 6 is illustrated.

Further, when n is an even number of 4 or more, the body portion 3 is an n-square tube shape that is a non-regular polygon tube shape, and the bottom portion 5 is an n-corner shape that is a non-regular polygon shape, as shown in FIG. The body part 16 and the bottom part 17 may be joined by a method similar to the method described in the step (4) to obtain the container body 1, or instead of this joining method, FIG. 4 (A) and (B) and the joining method described with reference to FIGS. 5 (A) to (C) may be used, and in this case, FIGS. 20 (A) and (B) The body part structure 16 ′ and the bottom part structure 17 ′ shown in FIG. Note that FIG. 20B shows a step corresponding to the step shown in FIG.

Here, in each of the above examples in which the body portion 3 has a substantially polygonal tube shape (including both regular polygonal tube shape and non-regular polygonal tube shape), the front and rear 2 of the surfaces constituting the body portion 3 are not folded. In addition to the surface, a trunk side second fold line portion 8 for folding inward is provided. However, instead of such a configuration, the body side second folding line portion 8 is provided on each surface of the body portion 3 (also on the front and rear surfaces that are not folded), and from the center of each side of the bottom portion 5. If the bottom side second fold line portion 15 extending toward the center portion of the bottom portion 5 is provided, the volume of the container body 1 is reduced more evenly and uniformly in the front-rear and left-right directions when the volume is reduced. If it becomes possible to further improve the self-supporting stability, and the shoulder side second fold line part 11 extending from the center of each side of the shoulder part 4 toward the center part of the shoulder part 4 is provided, the container The foldability of the is further improved. In this way, the trunk side second fold line portion 8 is inserted into the center of each surface of the trunk portion 3, and the shoulder side second fold line portion 11 linked to each trunk side second fold line portion 8, the bottom In order to provide the side second fold line portion 15 on the shoulder 4 and the bottom portion 5, for example, when sealing the trunk portion 3, each fold line portion 8, 11 is formed using a convex die. , 15 may be formed on the body 3, the shoulder 4, and the bottom 5.

In addition, it is also conceivable that the body 3 is not a polygonal cylinder, but a cylinder, an elliptic cylinder, etc., and the bottom 5 is shaped to follow the folding of the body 3.

FIGS. 4A and 4B and FIG. 5 show an example in which the body structure 16 ′ and the bottom structure 17 ′ are joined together in a folded state. 27, as shown in FIG. 27, the body part structure is expanded so that the lower end side of the body part structure 16 'folded by the gusset is greatly expanded and the lower end is expanded to the maximum extent. Only the gusset located at the lower part of 16 'is opened, and the peripheral portion of bottom structure 17' in a state of being expanded with respect to the lower end of body structure 16 'in the expanded state is, for example, hot plate welded Alternatively, bonding may be performed by high-frequency welding or ultrasonic welding.

Here, the lower part of the body part structure 16 'expanded as described above is a regular hexagon having a size substantially the same as, for example, the cross-sectional shape of the central part of the body part body 16' when expanded. It has a shape. And in order to expand the lower part of trunk | drum structure body 16 'in this way, the length a of the side of the regular hexagon which the cross section (or bottom part 5 when expand | deployed) of the trunk | drum 3 expands exhibits. And a distance b obtained by multiplying by sin 60 ° may be bent with reference to the position above the lower end of the body portion structure 16 ′.

Such a joining method can be applied if the body portion 3 has a substantially regular n-square cylindrical shape (n is an integer greater than or equal to 3) and the bottom portion 5 has a substantially regular n-corner shape. In order to expand the lower part of the body part constituting body 16 ', one side of a regular polygon having n sides exhibited by the cross section of the body part 3 (or the bottom part 5 when unfolded) when expanded is shown. The length is multiplied by a distance multiplied by 1 / (2 tan (180 ° / n)) as a guide from the position above the lower end of the trunk portion structure 16 ', and from the portion bent in the trunk portion structure 16'. What is necessary is just to expand so that the part to a lower end may become large as the lower end side by making the part to a lower end into the said lower part.

In addition, as shown in FIG. 28, such a joining method is such that the cross section of the trunk portion 3 (or the bottom portion 5 when unfolded) when expanded is a polygon having n sides (n is 4 or more). Of the n sides, the pair of opposite sides having the same length is longer than the other sides, and the lengths of the other sides are the same as each other. The present invention can also be applied to the case where it is configured (see FIGS. 19, 20A and 20B). In this case, in order to expand the lower part of the body part 16 'in the folded state, the expansion is performed. 1 / (2 tan (180 ° / n)) is added to the length of the polygonal short side (each other side) a ′ exhibited by the cross section of the body portion 3 (or the bottom portion 5 when unfolded). It suffices to bend the position b above the lower end of the body component body 16 'by the distance b multiplied.

Such a joining method includes not only the joining of the body constituent body 16 ′ and the bottom constituent body 17 ′ but also the shoulder constituent body when the shoulder constituent body is provided separately from the body constituent body. The present invention can also be applied to the joining between the body part and the body part (see FIG. 27). 27 and 28 show an example in which the slit 18 is provided at the end of each trunk side first fold line portion 7 of the trunk structure 16 '. However, the present invention is not limited thereto, and the slit 18 is not provided. May be.

In the container main body 1 shown in FIG. 20 (B), the distance between the adjacent cylinder side first fold line parts 7 (in the width direction) is uniform over the longitudinal direction (up and down), so the cylinder part when expanded. 3 becomes a polygonal cylinder shape (hexagonal cylinder shape), but the distance (in the width direction) between the adjacent cylinder side first fold line portions 7 is made uneven in the longitudinal direction (up and down) and expanded. You may make it take various shapes other than the polygonal cylinder shape (hexagonal cylinder shape) of the trunk | drum 3 at the time. In FIG. 29 (B), a curved portion R is provided at the center of each barrel side first fold line portion 7, and the distance (in the width direction) between the adjacent barrel side first fold line portions 7 is folded. 20 shows an example in which the width of the gusset portion 19 in the body portion 3 in the state becomes smaller toward the center side, and the container body 1 of this example is, for example, a container body in the folded state shown in FIG. As shown in FIG. 29 (A), the curved portions R and shoulders 4 are bordered on each gusset portion 19 to form a seal portion 45 that joins the inner surfaces of the gusset portions 19, and the seal portions 45 of the formed gusset portions 19 It can be obtained by cutting off the outside. And the curved part R may be provided not only in the center part of each trunk | drum side 1st fold line part 7, but in an upper part, a lower part, etc. The distance (in the width direction) is increased from one end (upper end) to the other end (lower end) in the longitudinal direction of each trunk side first fold line portion 7 (see FIG. 29C). Can be changed.

Moreover, said change which makes the distance (in the width direction) between the trunk | drum side 1st fold line parts 7 non-uniform | heterogenous over a longitudinal direction (up and down) is shown to FIG. 20 (A) and (B). The container body 1 as shown, that is, the two surfaces that are folded by the gusset between the two surfaces that are not folded by the gusset (for example, the front surface and the back surface) are sandwiched between the two surfaces. The left and right widths are not only applied to the container body 1 which is larger than the left and right widths of the other surfaces, but can also be applied to the various containers described above. For example, the container main body 1 shown in FIGS. 2A and 2B can be changed as shown in FIG. 30A and FIG.

Further, instead of or in addition to the configuration in which the distance (in the width direction) between the adjacent cylinder side first fold line portions 7 is not uniform in the longitudinal direction (up and down), the adjacent You may employ | adopt the structure that the distance (in the width direction) between the trunk | drum side 2nd fold line part 8 to become non-uniform | heterogenous over a longitudinal direction (up and down). Also in the case where the distance (in the width direction) between the adjacent cylinder side second fold line parts 8 is not uniform over the longitudinal direction (up and down), the shape of each cylinder side second fold line part 8 is various. Can be changed.

FIG. 1 shows an example in which a joining margin 26 is provided in advance in the bottom structure body 17. However, the present invention is not limited to this. For example, from the lower end side of the body structure body 16 in an expanded state, The bottom structure body 17 in a state of being expanded into a sheet larger than the lower end of the structure body 16 is pushed in, and the peripheral edge portion of the bottom structure body 17 bent along with the pushing is pushed to the lower end portion of the body structure body 16. You may make it join along.

An example of the specific method will be described with reference to FIG. 31. First, the trunk structure 16 is set on a receiving mold (anvil) 46 that can be separated into two parts, and is directed upward. The bottom part structure body 17 developed into a sheet larger than the lower end of the body part structure 16 is pushed into the inner surface of the lower end part by an ultrasonic horn 47 of an ultrasonic welding machine. Since the peripheral portion of the bottom component 17 is bent along with the pushing, the bent peripheral portion may be along the lower end portion of the trunk component 16 and joined by ultrasonic vibration of the ultrasonic horn 47 in that state. Also in this case, the lower end portion of the body portion structure 16 and the peripheral edge portion of the bottom portion structure 17 can be joined as shown in FIG. In the example shown in FIG. 31, the set surface 46 a of the anvil 46 has a substantially cylindrical surface shape, and the bottom structure 17 has a circular sheet shape, so that the peripheral edge of the bottom structure 17 is joined. The lower end portion of the rear body part structure 16 has a substantially cylindrical shape.

Needless to say, the above modifications may be combined as appropriate.

The container according to the present invention can be used, for example, to contain liquids such as beverages and liquid detergents and solids such as powders.

Claims (14)

1. It is a container having a barrel portion that is substantially cylindrical and can be folded by a gusset,
   A sheet-like bottom portion that closes a lower opening of the body portion in a state of being expanded into a substantially cylindrical shape;
   A peripheral portion of a sheet-like bottom component constituting the bottom is joined to a lower end of a barrel component that can be folded by a gusset in a substantially cylindrical shape that constitutes the barrel. container.
2. The body part structure includes a body side first fold line part that extends in a substantially vertical direction and induces a convex bending outward, and a body side first part that extends in a substantially vertical direction and induces a convex bending inward. Two fold line portions are provided to constitute the gusset,
   The bottom structure includes a bottom-side first fold line portion that extends from a position linked to the trunk-side first fold line portion toward a central portion of the bottom portion and induces an upwardly convex fold, A bottom-side second fold line portion that extends from the position linked to the trunk-side second fold line portion toward the central portion of the bottom portion and that guides a downward convex fold;
   The container according to claim 1, wherein the bottom portion is folded so as to be along the gusset when the trunk portion is folded, and is folded inside the trunk portion.
3. The bottom structure in a state of being folded by induction of the bottom first fold line part and the bottom second fold line part inside the lower part of the body part structure in a state folded by a gusset, The bottom side first fold line part is inserted so that each one of the bottom side fold line parts enters the inside of the trunk side first fold line part so that the central part of the bottom part structure faces forward. The container according to claim 2, wherein a peripheral portion of the bottom structure is joined to a lower end of the body structure in a state where the bottom structure is inserted in a lower part of the body structure.
4. A joining region where the inner surfaces of the trunk part structure are joined is adjacent to the upper end of the joint part with respect to the peripheral part of the bottom part structure at the lower end of the trunk part structure folded by the gusset. The container according to claim 3, wherein the upper edges of these joining regions are connected to each other to have a substantially boat shape.
5. Only the gusset located at the lower part of the trunk part structure is opened so that the lower end side is greatly expanded at the lower part of the lower part of the trunk part structure folded by the gusset, and thus expanded. The container of Claim 1 formed by joining the peripheral part of the said bottom part structure to the lower end part of this trunk | drum structure in a state.
6. The trunk structure has a regular polygon (n is an integer of 3 or more) having an n-side cross section in an expanded state,
   The length of one side of the regular polygon is multiplied by 1 / (2 tan (180 ° / n)), and is bent with a position above the lower end of the body part structure as a guideline. The container according to claim 5, wherein a portion from the bent portion to the lower end is greatly expanded toward the lower end side as the lower portion.
7. The body structure has a polygonal shape (n is an even number of 4 or more) having a cross section in an expanded state having n sides, and a pair of equal lengths of the n sides facing each other. Are longer than the other sides, and the lengths of the other sides are the same as each other.
   The length of each of the other sides is multiplied by 1 / (2 tan (180 ° / n)) by a distance above the lower end of the trunk structure, and is bent at the trunk structure. The container according to claim 5, wherein a portion from the formed part to the lower end is greatly expanded toward the lower end side as the lower part.
8. From the lower end side of the body part structure in an expanded state, the bottom part structure in a state of being expanded into a sheet larger than the lower end of the body part structure is pushed in, and bent along with the pushing. The container according to claim 1, wherein a peripheral edge portion of the bottom portion structure body is joined along a lower end portion of the body portion structure body.
9. The container according to any one of claims 1 to 8, wherein an upper portion of the body portion constitutes a substantially cylindrical pouring portion whose tip is closed.
10. The container according to any one of claims 2 to 4, wherein a distance in the width direction between the adjacent cylinder-side first fold line portions is not uniform in the longitudinal direction.
11. The trunk structure is folded so that the other surface folded by the gusset is sandwiched between two surfaces that are not folded by the gusset, and the left and right widths of the two surfaces are the left and right widths of the other surface. The container according to claim 10, wherein the container is larger than the width.
12. A container manufacturing method for manufacturing the container according to any one of claims 1 to 8, wherein the peripheral portion of the sheet-like bottom portion constituting the bottom portion and the body portion are constituted. A method for producing a container, wherein joining to a lower end portion of a cylindrical body part structure is performed by hot plate welding, high frequency welding or ultrasonic welding.
13. The container manufacturing method for manufacturing a container according to any one of claims 1 to 8, wherein a distance in the width direction between the adjacent cylinder side first fold line portions is uniform in the longitudinal direction. In the body part structure, the inner surfaces of the gusset parts of the body part body are joined so that the distance in the width direction between the adjacent body side first fold line parts is not uniform in the longitudinal direction. Container manufacturing method.
14. The trunk structure is folded so that the other surface folded by the gusset is sandwiched between two surfaces that are not folded by the gusset, and the left and right widths of the two surfaces are the left and right widths of the other surface. 14. A container according to claim 13, which is larger than the width.

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