JP2020055613A - Inner container for double container - Google Patents

Abstract

To provide an inner container of a double container capable of using up contents more and maximizing a volume reduction rate at the time of disposal of a used inner container as garbage, because an upper portion (shoulder portion) of the inner container is not deformed and only a body portion rotates vertically so as to collapse in a constant shape.SOLUTION: A horizontal cross section of a shoulder portion 20 and a bottom portion 30 of an inner container 2 is a regular n-sided polygon (n is an integer of 6 to 8), having n upper vertices 6 and n lower vertices 8, the upper vertices and the lower vertices are relatively rotationally displaced by a constant angle in a plan view of the inner container, a side surface of the inner container body 5 has a four-side area 10 surrounded by a ridge line that connects the upper vertices and the corresponding lower vertices in a one-to-one correspondence, and a reinforcing portion 12 for reinforcing the collapsing strength around the shoulder portion of the inner container is formed in a circumferential direction region of the shoulder portion where a conical surface 4 of the inner container and the inner container body portion are connected.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an inner container that is used in a double container (a container having a double structure of an outer container and an inner container) that sucks and discharges contents by a vacuum pump and that can be replaced with the outer container.

  In response to recent demands for resource saving, for example, in the case of a double container with a pump filled with contents such as shampoo, rinse and soap solution, even if the contents are used up, the pump and the outer container Is generally used as a cartridge, and only the inner container filled with the contents is replaced, and the used inner container is discarded.

  This cartridge-type inner container shrinks due to the vacuum action while the contents are being sucked out by the pump, but since the shape at the time of this shrinkage is not constant, it is irregular and does not collapse neatly, There is a problem that the material is discarded in a state where it is considerably left and is not environmentally friendly, and the volume reduction rate is small and bulky at the time of disposal.

  For the purpose of promoting the volume reduction rate, Japanese Patent Application Laid-Open No. 2005-88979 (Patent Document 1) discloses a thin-walled container in which a pump can be attached to a mouth portion according to discharge of contents. In a thin-walled container adapted to regulate how the container is crushed, a pump is attached to the mouth and an inner container having a thinner body peripheral wall. There is disclosed a double container adapted to control how the crushing is performed.

  However, in the case of this double container, since the pillar portion is provided on the peripheral wall of the inner container, the shape of the trunk portion when crushed is thinly deformed, but the length dimension in the vertical direction does not change, and as a whole, The volume reduction rate is not so large.

  Japanese Utility Model Laid-Open Publication No. 2-69886 (Patent Document 2) discloses a liquid dispensing method that includes an outer container that is difficult to deform and an inner container that can be easily deformed, and that is sealed at the mouth of the inner container at the mouth of the container. In the fluid discharge container equipped with the means, the inner container communicates at the center with four substantially triangular folds extending in directions perpendicular to each other, and the folds adjacent to each other Is disclosed, which comprises a bag-like container having a shape in which the right-angled portion is positioned upside down, and when folded, the folded portion is folded in four orthogonal directions to exhibit a flat cross-shaped contracted shape.

  However, even in the case of the inner container, when the inner container contracts, it may have a cross shape in plan view, but does not contract in the vertical direction, so that the volume reduction rate is not large.

  Furthermore, Japanese Patent Application Laid-Open No. 2008-21854 (Patent Document 3) discloses a reliable and stable discharge operation of contents by setting a collapsed deformation mode of an inner container of a double container with a pump to be set. As an object of obtaining, an inner container that is crushable and deformable, an outer container that stores and holds the inner container and an undeformed outer container, and a pump that is attached to both containers and discharges the contents of the inner container by a pump operation. A rib is formed on the body of the inner container to restrict crushing deformation to a constant form, and a ventilation portion for introducing outside air is provided between the inner container and the outer container to smoothly crush deformation. Are disclosed.

  However, also in the case of this inner container, since the ribs are formed in the body in the vertical direction, shrinkage does not occur in the height direction as in the above two patent documents, and the volume reduction rate is high. Not enough in direction.

  In order to solve the above-mentioned problems of the prior art, the applicant has disclosed in Japanese Patent Application No. 2014-226213 (Japanese Patent Application Laid-Open No. 2006-88582, Patent Document 4) that an inner container is rotated by a ridge formed on a side surface of a body. Although the invention has been proposed which has a configuration in which the body is collapsed (a configuration in which the body is collapsed in the height direction by rotational contraction), in this configuration, the stress caused by the contraction rotation of the trunk of the inner container acts on the shoulder. As a result, the shoulder was deformed, and there was a problem that it could not be crushed in a beautiful shape. The configuration in which the container is crushed while rotating by the ridge line formed on the side surface of the body is a known configuration disclosed in Japanese Patent Application Laid-Open No. 54-65686 (Patent Document 5).

JP 2005-88979 A JP-A-2-69886 JP 2008-13854 A JP-A-2006-88582 JP-A-54-65686

  The present invention improves the invention proposed in Japanese Patent Application No. 2014-226213, and does not collapse the shape of the shoulder of the inner container when the body is rotated and contracted, that is, the upper portion (shoulder) of the inner container is deformed. It is possible to use up the contents more by making only the body part squeezed neatly while rotating in the vertical and radial directions, and to reduce the volume when disposing of used inner containers as garbage. The object is to provide a double container inner container that can maximize the rate.

In order to achieve the above object, the first invention of the present application is arranged such that a body is housed in an outer container having a cylindrical shape and a conical surface between a neck and a shoulder, and the contents are sucked by a vacuum pump to the outside. An inner container for a double container discharging to
The inner container is integrally formed of a soft resin, the inner container neck corresponding to the neck of the outer container, the inner container cone corresponding to the cone from the neck to the shoulder of the outer container, and the inner container trunk. Have
The inner container body,
The horizontal cross section of the shoulder and the bottom of the inner container is a regular n-sided polygon (n is any integer from 6 to 8), and has n upper vertices and n lower vertices,
The upper apex and the lower apex are relatively displaced by a fixed angle in plan view of the inner container,
On the side surface of the inner container body, a four-sided area surrounded by a ridge connecting all the upper vertices and the lower vertices corresponding one-to-one to all the upper vertices is formed,
A reinforcing portion for reinforcing the crush strength around the shoulder of the inner container is formed in a circumferential region of a shoulder connecting the inner container cone surface and the inner container body.

Further, the second invention of the present application is directed to a double container in which the body is housed inside an outer container having a cylindrical shape and a conical surface between the neck and the shoulder, and the contents are sucked out by a vacuum pump and discharged to the outside. An inner container for the container,
The inner container is integrally formed of a soft resin, the inner container neck corresponding to the neck of the outer container, the inner container cone corresponding to the cone from the neck to the shoulder of the outer container, and the inner container trunk. Have
The inner container body,
The horizontal cross section of the shoulder portion of the inner container has n upper vertices corresponding to vertices of a virtual regular n-sided polygon (n is any integer from 6 to 8). , Comprising an R curved surface having a curvature smaller than the inner surface curvature of the outer container,
The horizontal cross section of the bottom of the inner container has the same shape or a regular n-gon as the horizontal cross section of the shoulder of the inner container, and has n lower vertices,
The upper apex and the lower apex are relatively displaced by a fixed angle in plan view of the inner container,
On the side surface of the inner container body, a four-sided area surrounded by a ridge connecting all the upper vertices and the lower vertices corresponding one-to-one to all the upper vertices is formed,
A reinforcing portion for reinforcing the crush strength around the shoulder of the inner container is formed in a circumferential region of a shoulder connecting the inner container cone surface and the inner container body.

  According to the inner container according to the first invention of the present application, when the contents contained in the inside are discharged to the outside by the pump, the torsion is generated on the side of the body by the decompression, so that the body is in the vertical and radial directions. By forming a reinforcing portion in the circumferential region of the shoulder where the inner container cone surface and the inner container body connect while the outer container contracts, the shoulder of the inner container does not deform and the shoulder has a predetermined shape. Only the body part shrinks cleanly in the vertical and radial directions while maintaining the same, so that the contents can be discharged to the outside without excess, and the volume reduction rate when disposing the inner container as garbage can be increased. it can.

  Further, according to the inner container according to the second invention of the present application, the horizontal cross section of the shoulder portion of the inner container is formed by the R curved surface having a curvature smaller than the inner surface curvature of the outer container between n upper vertices. The circumferential region of the shoulder connecting the inner container cone surface and the inner container body is further reinforced, and the deformation of the inner container shoulder can be more reliably prevented by a synergistic effect with the reinforcing portion.

Sectional view of the vacuum pump container according to the present invention The perspective view of the inner container concerning a first embodiment of the present invention. The horizontal sectional view of the shoulder and the bottom of the inner container according to the first embodiment of the present invention. Sectional drawing which shows the process in which the inner container which concerns on 1st embodiment of this invention collapses The perspective view which shows the process in which the inner container which concerns on 1st embodiment of this invention collapses. A real photograph comparing the collapsed state of the comparative example having no reinforcing portion and the inner container according to the first embodiment. Sectional view of the reinforcing portion according to the second embodiment of the present invention Sectional view of the reinforcing portion according to the third embodiment of the present invention Sectional view of a reinforcing portion according to a fourth embodiment of the present invention. Perspective view of a reinforcing portion according to a fifth embodiment of the present invention. Sectional view of a reinforcing portion according to a sixth embodiment of the present invention. Perspective view of a reinforcing portion according to a sixth embodiment of the present invention.

A first embodiment according to the present invention will be described in detail with reference to FIGS.
FIG. 1 shows a double container with a vacuum pump having an inner container according to the present invention. An inner container 2 is accommodated in a cylindrical outer container 1, and a vacuum pump 50 is mounted on a neck of the outer container 1. The suction nozzle 60 extending to reach the contents filled inside the inner container 2 is extended.

  The outer container 1 is formed of a hard resin (for example, an acrylic resin, a styrene-based resin, an olefin-based resin, an ester-based resin, etc.), and the inner container 2 is formed of a soft resin (for example, a low-density polyethylene, etc.) by blow molding to form a thin and integral body. It is easily deformable. The double container with a vacuum pump is a device that pumps out the contents stored in the inner container using a vacuum pump, and inserts the cylinder part of the pump into the inner container to suck the contents. Then, when it is discharged to the outside, the inside of the inner container is depressurized according to the volume of the sucked contents.

  The inner container 2 is a pseudo-hexagonal cylindrical body as a whole as shown in FIG. 2, and the inner container neck 3 and the inner container cone surface 4 corresponding to the neck of the outer container 1 and the conical surface of the outer container 1, It is composed of a container body 5. Reference numeral 40 in the drawing denotes a rotation prevention stopper that prevents the inner container 2 from rotating with respect to the outer container 1.

  FIGS. 3A and 3B show horizontal cross sections of the shoulder and the bottom of the inner container. As shown in the figure, the inner container body 5 has six upper vertices 6 corresponding to vertices of a virtual regular hexagon in a horizontal sectional view of the shoulder 20 of the inner container 2, and between the upper vertices 6, It is composed of an R-curved surface 7 having a curvature smaller than the inner surface curvature of the outer container 1 (see FIG. 3A), and the horizontal cross section of the bottom 30 of the inner container 2 has the same shape as the horizontal cross section of the shoulder 20 of the inner container 2. It has six lower vertices 8, and the six upper vertices 6 and the six lower vertices 8 are relatively displaced by 15 degrees in a plan view of the inner container 2 (see FIG. 3B). . The curvature of the R curved surface 7 is preferably 0.2 to 0.6 with respect to the inner surface curvature of the outer container 1, but is not particularly limited thereto.

  The horizontal cross-sectional shape of the shoulder 20 of the inner container body 5 is not limited to a virtual regular hexagon, and may have a configuration having seven or eight vertices corresponding to the vertices of a virtual regular heptagon or a virtual regular octagon. As a result of the experiment, if the vertices are equal to or smaller than the virtual regular pentagon and equal to or larger than the virtual regular pentagon, the rotational contraction of the inner container body 5 described later does not function well.

  As shown in FIG. 2, on the side surface of the inner container body 5, a ridge line 9 connecting all the upper vertexes 6 and the lower vertexes 8 corresponding to all the upper vertices 1 to 1, a shoulder 20, and a bottom 30 are provided. A four-sided region 10 having a concave curved surface shape is formed, and a valley fold line 11 connecting the upper vertex 6 and the diagonally lower vertex 8 is formed in the four-sided region 10.

  The valley fold line 11 is a fold (streak) for facilitating the side surface of the inner container 2 to be folded inside the container, and is formed when the inner container 2 is formed. The ridge line 9 is formed so as to be in a mountain-folded state when the inner container 2 contracts.

  The valley fold line 11 is for guiding the rotation and contraction operation of the inner container body 5 so as to be always at a predetermined movement. As a result of the experiment, the four-sided region 10 having the concave curved surface shape is used even without this. The valley fold line 11 is not an essential component and does not have to be formed because the rotator shrinks to the extent that it can withstand the deformation. Note that the valley fold line 11 is not limited to the line connecting the upper vertex 6 and the diagonally lower vertex 8, and may be provided at a plurality of positions as appropriate. For example, another valley crease line or the like extending from another upper vertex 6 or lower vertex 8 toward the middle of the valley crease line 11 may be formed.

  Each time the user presses the vacuum pump 50, the inner container body 5 is depressurized by discharging the contents to the outside, is folded along the valley fold line 11, and rotates in the vertical and radial directions. Shrink.

  In the circumferential region of the shoulder 20 where the inner container cone surface 4 and the inner container body 5 are connected, a reinforcing portion 12 for reinforcing the crushing strength around the shoulder 20 of the inner container is provided around the entire periphery of the shoulder 20. Is formed over. As is clear from the cross-sectional view of FIG. 1, the reinforcing portion 12 in the present embodiment extends from the shoulder portion 20 toward the inside of the container by a predetermined range, and is a planar reinforcement formed of a plane along the horizontal cross section of the shoulder portion 20. It is configured as a unit 13. The entire periphery of the shoulder portion 20 is reinforced by the planar reinforcing portion 13 and deformation can be eliminated.

  FIGS. 4 and 5 are views showing a state in the middle of the process in which the inner container body 5 is rotationally contracted and collapsed, and the reinforcing portion 12 is connected to the shoulder portion 20 connecting the inner container cone surface 4 and the inner container body. , The shape of the shoulder portion 20 can be maintained even when the shoulder portion 20 is stressed due to the rotational shrinkage of the inner container body 5. When the horizontal distance from the shoulder portion 20 to the inner container neck 3 is L, and the width of the reinforcing portion 12 is l, l / L is about 0.1 to 0.3. Is preferred.

  FIG. 6 is an actual photograph of a comparative example having no reinforcing portion 12 and a cross section of the inner container body 5 having a regular hexagonal shape, and a result of a comparison experiment of the collapse of the inner container 2 of the first embodiment of the present invention. It is. As is clear from the results of the comparative experiment, the inner container 2 of the first embodiment of the present application shows that the inner container body 5 is squashed in the vertical and radial directions without deformation of the shoulder 20. .

  In addition, even if the horizontal section of the shoulder part 20 is made into a regular hexagon (or regular heptagon or regular octagon), and the space between the tops is made linear, and only the reinforcing part 12 is provided, the shoulder part 20 can withstand collapse. Although it can be suppressed to a certain extent, in the first embodiment, in addition to the reinforcing portion 12, in order to more reliably prevent the crushing of the shoulder portion 20 due to the rotational contraction of the inner container body 5, An R curved surface 7 is formed between the six upper vertices 6, and the peripheral strength of the shoulder portion 20 is further enhanced by a synergistic effect of the reinforcing portion 12 and the R curved surface 7.

  7 to 12 are views showing the configuration of the reinforcing portion 12 according to the second to sixth embodiments of the present invention.

  The reinforcing portion 12 according to the second embodiment shown in FIG. 7 is an inclined surface that gradually becomes inclined from the inflection point Q in the middle of the inner container cone surface 4 toward the shoulder portion 20 of the inner container body 5. It is preferable that the inclination angle θ is in the range of 0 <θ ≦ + 15 degrees with respect to the horizontal sectional line of the shoulder portion 20. If the inclination angle θ exceeds 15 degrees, the shoulder 20 is deformed similarly to the related art, so that the deformation can be eliminated within the above range. In this case, it is assumed that the inclination angle θ in this case is naturally smaller than the inclination angle of the shoulder 20 of the inner container conical surface 4 with respect to the horizontal sectional line.

  The reinforcing portion 12 according to the third embodiment shown in FIG. 8 is located on the inner side from the inflection point Q in the middle of the inner container cone surface 4 in a direction opposite to the inclination direction of the reinforcing portion 12 according to the second embodiment. Toward the shoulder 20 of the container body 5, there is a planar reinforcing portion 13 composed of an inclined surface opposite to the inclined surface of the inner container conical surface 4, and the inclination angle θ is defined by a horizontal sectional line of the shoulder 20. On the other hand, it is appropriate that -15 degrees ≦ θ <0. If the inclination angle θ exceeds −15 degrees, the shoulder 20 is deformed similarly to the related art, so that the deformation can be eliminated within the above range.

  The reinforcing portion 12 according to the fourth embodiment shown in FIG. 9A is formed by a flange formed by folding a resin film constituting the inner container 2 so as to protrude outward from the entire periphery of the shoulder portion 20 of the inner container body 5. It is configured as a reinforcement member 14. The entire periphery of the shoulder portion 20 is reinforced by the flange-shaped reinforcing portion 14, and deformation of the shoulder portion 20 can be eliminated. In the example shown in FIG. 9B, the planar reinforcing portion 13 and the flange-shaped reinforcing portion 14 are combined, so that the entire circumferential strength of the shoulder portion 20 can be further increased.

  The reinforcing portion 12 according to the fifth embodiment shown in FIG. 10A is configured as a wedge-shaped reinforcing portion 15 formed at a position corresponding to the upper vertex 6. The vicinity of each upper vertex 6 is reinforced by the wedge-shaped reinforcing portion 15, and deformation occurring around the upper vertex 6 can be eliminated. In this case, it is desirable that an R curved surface 7 is formed between the upper vertices 6. In the example shown in FIG. 10B, the planar reinforcing portion 13 and the wedge-shaped reinforcing portion 15 are combined, so that the entire circumferential strength of the shoulder portion 20 can be further increased.

  The reinforcing portion 12 according to the sixth embodiment shown in FIG. 11A is configured as a convex annular reinforcing portion 16 having a semicircular cross section formed continuously around the shoulder portion 20. The entire circumference of the shoulder portion 20 is reinforced by the convex annular reinforcing portion 16, and the deformation of the shoulder portion 20 can be eliminated. Note that the example shown in FIG. 11B is configured by combining the planar reinforcing portion 13 and the convex annular reinforcing portion 16, whereby the circumferential strength of the shoulder portion 20 can be further increased. FIG. 12 is a perspective view thereof.

  As described in each of the above-described embodiments, the reinforcing portion 12 according to the present invention is formed around the shoulder 20 of the inner container body 5, and suppresses the deformation of the shoulder 20 due to the rotational shrinkage of the inner container body 5. This means includes various shapes and configurations other than those described in the above embodiments.

  As described above, the periphery of the shoulder portion 20 includes the reinforcing portion 12 or the planar reinforcing portion 13 formed of any one of the planar reinforcing portion 13, the flange-shaped reinforcing portion 14, the wedge-shaped reinforcing portion 15, and the convex annular reinforcing portion 16. It is reinforced by the reinforcing portion 12 composed of any one of the flange-shaped reinforcing portion 14, the wedge-shaped reinforcing portion 15, and the convex annular reinforcing portion 16, and suppresses the deformation of the shoulder portion 20 due to the rotational shrinkage of the inner container body 5. Further, by forming an R-curved surface between the upper vertices 6, the deformation of the shoulder portion 20 can be more reliably suppressed.

  As described above, the embodiment according to the present invention has been described. In each of the above-described embodiments, the rotational displacement angle of the corresponding upper vertex 6 and the lower vertex 8 is too small, or too large. In any case, since the rotation shrinkage of the inner container body 5 does not occur neatly, the angle is preferably in the range of 10 to 45 degrees.

  The inner container cone surface is not limited to the cone surface illustrated in FIG. 2, and may be a hexagonal pyramid surface, a heptagonal pyramid surface, or an octagonal pyramid surface according to the upper apex 6 of the inner container body 5.

  In the above-described embodiment, the horizontal section of the bottom portion 30 also has an R-curved surface, so that the bottom portion of the inner container body 5 does not deform and rises upward (vertically) while the bottom portion remains flat. Although it is possible to prevent accumulation of contents more effectively, only the shoulder 20 cross section may have an R-curved surface, and the bottom cross section may be formed in a regular n-sided shape.

  As described above, according to the inner container of the present invention, when the contents contained in the inside are discharged to the outside by the pump, the torsion is caused on the side of the body by the decompression, so that the body is vertically and radially oriented. By forming a reinforcing portion in the circumferential region of the shoulder where the inner container cone surface and the inner container body connect while the outer container contracts, the shoulder of the inner container does not deform and the shoulder has a predetermined shape. Only the body part shrinks cleanly in the vertical and radial directions while maintaining the same, so that the contents can be discharged to the outside without excess, and the volume reduction rate when disposing the inner container as garbage can be increased. it can.

DESCRIPTION OF SYMBOLS 1 Outer container 2 Inner container 3 Inner container neck 4 Inner container cone surface 5 Inner container trunk 6 Upper vertex 7 R curved surface 8 Lower vertex 9 Ridge line 10 Quadrilateral area 11 Valley bending habit line 12 Reinforcement part 13 Planar reinforcing part 14 Flange shape Reinforcement part 15 Wedge-shaped reinforcement part 16 Convex annular reinforcement part 20 Shoulder part 30 Bottom part 40 Stop-around prevention stopper 50 Vacuum pump 60 Suction nozzle

In order to achieve the above object, the first invention of the present application is arranged such that a body is housed in an outer container having a cylindrical shape and a conical surface between a neck and a shoulder, and the contents are sucked by a vacuum pump to the outside. An inner container for a double container discharging to
The inner container is integrally formed of a soft resin, the inner container neck corresponding to the neck of the outer container, the inner container cone corresponding to the cone from the neck to the shoulder of the outer container, and the inner container trunk. Have
The inner container body,
The horizontal cross section of the shoulder and the bottom of the inner container is a regular n-sided polygon (n is any integer from 6 to 8), and has n upper vertices and n lower vertices,
The upper apex and the lower apex are relatively displaced by a fixed angle in plan view of the inner container,
On the side surface of the inner container body, a four-sided area surrounded by a ridge connecting all the upper vertices and the lower vertices corresponding one-to-one to all the upper vertices is formed,
In the circumferential region of the shoulder connecting the inner container cone surface and the inner container body, a reinforcing portion for reinforcing the crushing strength around the shoulder of the inner container is formed, and the reinforcing portion is In a vertical sectional view of the inner container, a horizontal surface extending along a horizontal cross-sectional line of the shoulder of the inner container from the shoulder of the inner container toward the cone surface of the inner container, or the reinforcing portion, In a vertical cross-sectional view of the inner container, a slope inclined and extended from a shoulder of the inner container toward a cone section of the inner container with respect to a horizontal sectional line of a shoulder of the inner container, wherein the slope of the slope is The angle is within a range of +15 degrees to −15 degrees with respect to a horizontal cross section line of the shoulder of the inner container, and when the inclination angle is in a range of +, the shoulder of the inner container on the inner container cone surface. Smaller than the angle of inclination of the If the horizontal distance from the shoulder portion of the container to the neck of the inner vessel was L, and width of the reinforcing part and l, l / L is 0.1 to 0.3, and wherein the.

Further, the second invention of the present application is directed to a double container in which the body is housed inside an outer container having a cylindrical shape and a conical surface between the neck and the shoulder, and the contents are sucked out by a vacuum pump and discharged to the outside. An inner container for the container,
The inner container is integrally formed of a soft resin, the inner container neck corresponding to the neck of the outer container, the inner container cone corresponding to the cone from the neck to the shoulder of the outer container, and the inner container trunk. Have
The inner container body,
The horizontal cross section of the shoulder portion of the inner container has n upper vertices corresponding to vertices of a virtual regular n-sided polygon (n is any integer from 6 to 8). , Comprising an R curved surface having a curvature smaller than the inner surface curvature of the outer container,
The horizontal cross section of the bottom of the inner container has the same shape or a regular n-gon as the horizontal cross section of the shoulder of the inner container, and has n lower vertices,
The upper apex and the lower apex are relatively displaced by a fixed angle in plan view of the inner container,
On the side surface of the inner container body, a four-sided area surrounded by a ridge connecting all the upper vertices and the lower vertices corresponding one-to-one to all the upper vertices is formed,
In the circumferential region of the shoulder connecting the inner container cone surface and the inner container body, a reinforcing portion for reinforcing the crushing strength around the shoulder of the inner container is formed, and the reinforcing portion is In a vertical sectional view of the inner container, a horizontal surface extending along a horizontal cross-sectional line of the shoulder of the inner container from the shoulder of the inner container toward the cone surface of the inner container, or the reinforcing portion, In a vertical cross-sectional view of the inner container, a slope inclined and extended from a shoulder of the inner container toward a cone section of the inner container with respect to a horizontal sectional line of a shoulder of the inner container, wherein the slope of the slope is The angle is within a range of +15 degrees to −15 degrees with respect to a horizontal cross section line of the shoulder of the inner container, and when the inclination angle is in a range of +, the shoulder of the inner container on the inner container cone surface. Smaller than the angle of inclination of the If the horizontal distance from the shoulder portion of the container to the neck of the inner vessel was L, and width of the reinforcing part and l, l / L is 0.1 to 0.3, and wherein the.

  The present invention relates to an inner container that is used in a double container (a container having a double structure of an outer container and an inner container) that sucks and discharges contents by a vacuum pump and that can be replaced with the outer container.

  In response to recent demands for resource saving, for example, in the case of a double container with a pump filled with contents such as shampoo, rinse and soap solution, even if the contents are used up, the pump and the outer container Is generally used as a cartridge, and only the inner container filled with the contents is replaced, and the used inner container is discarded.

  This cartridge-type inner container shrinks due to the vacuum action while the contents are being sucked out by the pump, but since the shape at the time of this shrinkage is not constant, it is irregular and does not collapse neatly, There is a problem that the material is discarded in a state where it is considerably left and is not environmentally friendly, and the volume reduction rate is small and bulky at the time of disposal.

  For the purpose of promoting the volume reduction rate, Japanese Patent Application Laid-Open No. 2005-88979 (Patent Document 1) discloses a thin-walled container in which a pump can be attached to a mouth portion according to discharge of contents. In a thin-walled container adapted to regulate how the container is crushed, a pump is attached to the mouth and an inner container having a thinner body peripheral wall. There is disclosed a double container adapted to control how the crushing is performed.

  However, in the case of this double container, since the pillar portion is provided on the peripheral wall of the inner container, the shape of the trunk portion when crushed is thinly deformed, but the length dimension in the vertical direction does not change, and as a whole, The volume reduction rate is not so large.

  Japanese Utility Model Laid-Open Publication No. 2-69886 (Patent Document 2) discloses a liquid dispensing method that includes an outer container that is difficult to deform and an inner container that can be easily deformed, and that is sealed at the mouth of the inner container at the mouth of the container. In the fluid discharge container equipped with the means, the inner container communicates at the center with four substantially triangular folds extending in directions perpendicular to each other, and the folds adjacent to each other Is disclosed, which comprises a bag-like container having a shape in which the right-angled portion is positioned upside down, and when folded, the folded portion is folded in four orthogonal directions to exhibit a flat cross-shaped contracted shape.

  However, even in the case of the inner container, when the inner container contracts, it may have a cross shape in plan view, but does not contract in the vertical direction, so that the volume reduction rate is not large.

  Furthermore, Japanese Patent Application Laid-Open No. 2008-21854 (Patent Document 3) discloses a reliable and stable discharge operation of contents by setting a collapsed deformation mode of an inner container of a double container with a pump to be set. As an object of obtaining, an inner container that is crushable and deformable, an outer container that stores and holds the inner container and an undeformed outer container, and a pump that is attached to both containers and discharges the contents of the inner container by a pump operation. A rib is formed on the body of the inner container to restrict crushing deformation to a constant form, and a ventilation portion for introducing outside air is provided between the inner container and the outer container to smoothly crush deformation. Are disclosed.

  However, also in the case of this inner container, since the ribs are formed in the body in the vertical direction, shrinkage does not occur in the height direction as in the above two patent documents, and the volume reduction rate is high. Not enough in direction.

  In order to solve the above-mentioned problems of the prior art, the applicant has disclosed in Japanese Patent Application No. 2014-226213 (Japanese Patent Application Laid-Open No. 2006-88582, Patent Document 4) that an inner container is rotated by a ridge formed on a side surface of a body. Although the invention has been proposed which has a configuration in which the body is collapsed (a configuration in which the body is collapsed in the height direction by rotational contraction), in this configuration, the stress caused by the contraction rotation of the trunk of the inner container acts on the shoulder. As a result, the shoulder was deformed, and there was a problem that it could not be crushed in a beautiful shape. The configuration in which the container is crushed while rotating by the ridge line formed on the side surface of the body is a known configuration disclosed in Japanese Patent Application Laid-Open No. 54-65686 (Patent Document 5).

JP 2005-88979 A JP-A-2-69886 JP 2008-13854 A JP-A-2006-88582 JP-A-54-65686

  The present invention improves the invention proposed in Japanese Patent Application No. 2014-226213, and does not collapse the shape of the shoulder of the inner container when the body is rotated and contracted, that is, the upper portion (shoulder) of the inner container is deformed. It is possible to use up the contents more by making only the body part squeezed neatly while rotating in the vertical and radial directions, and to reduce the volume when disposing of used inner containers as garbage. The object is to provide a double container inner container that can maximize the rate.

To achieve the above object, the present invention is between body portion of the neck portion and shoulder portion of a cylindrical shape is housed inside the outer container formed of a conical surface, discharged to the outside by sucking the contents by a vacuum pump An inner container for a double container,
The inner container is integrally formed of a soft resin, the inner container neck corresponding to the neck of the outer container, the inner container conical surface corresponding to the conical surface from the neck to the shoulder of the outer container, and the inner container body. Have
The inner container body,
The horizontal cross section of the shoulder portion of the inner container has n upper vertices corresponding to vertices of a virtual regular n-sided polygon (n is any integer from 6 to 8). , Comprising an R curved surface having a curvature smaller than the inner surface curvature of the outer container,
The horizontal cross section of the bottom of the inner container has the same shape or a regular n-gon as the horizontal cross section of the shoulder of the inner container, and has n lower vertices,
The upper apex and the lower apex are relatively displaced by a fixed angle in plan view of the inner container,
On the side surface of the inner container body, a four-sided area surrounded by a ridge connecting all the upper vertices and the lower vertices corresponding one-to-one to all the upper vertices is formed,
In the circumferential region of the shoulder connecting the inner container cone surface and the inner container body, a reinforcing portion for reinforcing the crushing strength around the shoulder of the inner container is formed, and the reinforcing portion is In a vertical sectional view of the inner container, a horizontal surface extending along a horizontal cross-sectional line of the shoulder of the inner container from the shoulder of the inner container toward the cone surface of the inner container, or the reinforcing portion, In a vertical cross-sectional view of the inner container, a slope inclined and extended from a shoulder of the inner container toward a cone section of the inner container with respect to a horizontal sectional line of a shoulder of the inner container, wherein the slope of the slope is The angle is within a range of +15 degrees to −15 degrees with respect to a horizontal cross section line of the shoulder of the inner container, and when the inclination angle is in a range of +, the shoulder of the inner container on the inner container cone surface. Smaller than the angle of inclination of the If the horizontal distance from the shoulder portion of the container to the neck of the inner vessel was L, and width of the reinforcing part and l, l / L is 0.1 to 0.3, and wherein the.

According to the inner container according to the present invention, the horizontal cross section of the shoulder of the inner container is formed by an R curved surface having a curvature smaller than the inner surface curvature of the outer container between n upper vertices. The circumferential region of the shoulder connecting the surface and the inner container body is further reinforced, and the synergistic effect with the reinforcing portion can more reliably prevent the deformation of the inner container shoulder.

Sectional view of the vacuum pump container according to the present invention The perspective view of the inner container concerning a first embodiment of the present invention. The horizontal sectional view of the shoulder and the bottom of the inner container according to the first embodiment of the present invention. Sectional drawing which shows the process in which the inner container which concerns on 1st embodiment of this invention collapses The perspective view which shows the process in which the inner container which concerns on 1st embodiment of this invention collapses. A real photograph comparing the collapsed state of the comparative example having no reinforcing portion and the inner container according to the first embodiment. Sectional view of the reinforcing portion according to the second embodiment of the present invention Sectional view of the reinforcing portion according to the third embodiment of the present invention Sectional view of a reinforcing portion according to a fourth embodiment of the present invention. Perspective view of a reinforcing portion according to a fifth embodiment of the present invention. Sectional view of a reinforcing portion according to a sixth embodiment of the present invention. Perspective view of a reinforcing portion according to a sixth embodiment of the present invention.

A first embodiment according to the present invention will be described in detail with reference to FIGS.
FIG. 1 shows a double container with a vacuum pump having an inner container according to the present invention. An inner container 2 is accommodated in a cylindrical outer container 1, and a vacuum pump 50 is mounted on a neck of the outer container 1. The suction nozzle 60 extending to reach the contents filled inside the inner container 2 is extended.

  The outer container 1 is formed of a hard resin (for example, an acrylic resin, a styrene-based resin, an olefin-based resin, an ester-based resin, etc.), and the inner container 2 is formed of a soft resin (for example, a low-density polyethylene, etc.) by blow molding to form a thin and integral body. It is easily deformable. The double container with a vacuum pump is a device that pumps out the contents stored in the inner container using a vacuum pump, and inserts the cylinder part of the pump into the inner container to suck the contents. Then, when it is discharged to the outside, the inside of the inner container is depressurized according to the volume of the sucked contents.

  The inner container 2 is a pseudo-hexagonal cylindrical body as a whole as shown in FIG. 2, and the inner container neck 3 and the inner container cone surface 4 corresponding to the neck of the outer container 1 and the conical surface of the outer container 1, It is composed of a container body 5. Reference numeral 40 in the drawing denotes a rotation prevention stopper that prevents the inner container 2 from rotating with respect to the outer container 1.

  FIGS. 3A and 3B show horizontal cross sections of the shoulder and the bottom of the inner container. As shown in the figure, the inner container body 5 has six upper vertices 6 corresponding to vertices of a virtual regular hexagon in a horizontal sectional view of the shoulder 20 of the inner container 2, and between the upper vertices 6, It is composed of an R-curved surface 7 having a curvature smaller than the inner surface curvature of the outer container 1 (see FIG. 3A), and the horizontal cross section of the bottom 30 of the inner container 2 has the same shape as the horizontal cross section of the shoulder 20 of the inner container 2. It has six lower vertices 8, and the six upper vertices 6 and the six lower vertices 8 are relatively displaced by 15 degrees in a plan view of the inner container 2 (see FIG. 3B). . The curvature of the R curved surface 7 is preferably 0.2 to 0.6 with respect to the inner surface curvature of the outer container 1, but is not particularly limited thereto.

  The horizontal cross-sectional shape of the shoulder 20 of the inner container body 5 is not limited to a virtual regular hexagon, and may have a configuration having seven or eight vertices corresponding to the vertices of a virtual regular heptagon or a virtual regular octagon. As a result of the experiment, if the vertices are equal to or smaller than the virtual regular pentagon and equal to or larger than the virtual regular pentagon, the rotational contraction of the inner container body 5 described later does not function well.

  As shown in FIG. 2, on the side surface of the inner container body 5, a ridge line 9 connecting all the upper vertexes 6 and the lower vertexes 8 corresponding to all the upper vertices 1 to 1, a shoulder 20, and a bottom 30 are provided. A four-sided region 10 having a concave curved surface shape is formed, and a valley fold line 11 connecting the upper vertex 6 and the diagonally lower vertex 8 is formed in the four-sided region 10.

  The valley fold line 11 is a fold (streak) for facilitating the side surface of the inner container 2 to be folded inside the container, and is formed when the inner container 2 is formed. The ridge line 9 is formed so as to be in a mountain-folded state when the inner container 2 contracts.

  The valley fold line 11 is for guiding the rotation and contraction operation of the inner container body 5 so as to be always at a predetermined movement. As a result of the experiment, the four-sided region 10 having the concave curved surface shape is used even without this. The valley fold line 11 is not an essential component and does not have to be formed because the rotator shrinks to the extent that it can withstand the deformation. Note that the valley fold line 11 is not limited to the line connecting the upper vertex 6 and the diagonally lower vertex 8, and may be provided at a plurality of positions as appropriate. For example, another valley crease line or the like extending from another upper vertex 6 or lower vertex 8 toward the middle of the valley crease line 11 may be formed.

  Each time the user presses the vacuum pump 50, the inner container body 5 is depressurized by discharging the contents to the outside, is folded along the valley fold line 11, and rotates in the vertical and radial directions. Shrink.

  In the circumferential region of the shoulder 20 where the inner container cone surface 4 and the inner container body 5 are connected, a reinforcing portion 12 for reinforcing the crushing strength around the shoulder 20 of the inner container is provided around the entire periphery of the shoulder 20. Is formed over. As is clear from the cross-sectional view of FIG. 1, the reinforcing portion 12 in the present embodiment extends from the shoulder portion 20 toward the inside of the container by a predetermined range, and is a planar reinforcement formed of a plane along the horizontal cross section of the shoulder portion 20. It is configured as a unit 13. The entire periphery of the shoulder portion 20 is reinforced by the planar reinforcing portion 13 and deformation can be eliminated.

  FIGS. 4 and 5 are views showing a state in the middle of the process in which the inner container body 5 is rotationally contracted and collapsed, and the reinforcing portion 12 is connected to the shoulder portion 20 connecting the inner container cone surface 4 and the inner container body. , The shape of the shoulder portion 20 can be maintained even when the shoulder portion 20 is stressed due to the rotational shrinkage of the inner container body 5. When the horizontal distance from the shoulder portion 20 to the inner container neck 3 is L, and the width of the reinforcing portion 12 is l, l / L is about 0.1 to 0.3. Is preferred.

  FIG. 6 is an actual photograph of a comparative example having no reinforcing portion 12 and a cross section of the inner container body 5 having a regular hexagonal shape, and a result of a comparison experiment of the collapse of the inner container 2 of the first embodiment of the present invention. It is. As is clear from the results of the comparative experiment, the inner container 2 of the first embodiment of the present application shows that the inner container body 5 is squashed in the vertical and radial directions without deformation of the shoulder 20. .

  In addition, even if the horizontal section of the shoulder part 20 is made into a regular hexagon (or regular heptagon or regular octagon), and the space between the tops is made linear, and only the reinforcing part 12 is provided, the shoulder part 20 is crushed. Although it can be suppressed to a certain extent, in the first embodiment, in addition to the reinforcing portion 12, in order to more reliably prevent the crushing of the shoulder portion 20 due to the rotational contraction of the inner container body 5, An R curved surface 7 is formed between the six upper vertices 6, and the peripheral strength of the shoulder portion 20 is further enhanced by a synergistic effect of the reinforcing portion 12 and the R curved surface 7.

  7 to 12 are views showing the configuration of the reinforcing portion 12 according to the second to sixth embodiments of the present invention.

  The reinforcing portion 12 according to the second embodiment shown in FIG. 7 is an inclined surface that gradually becomes inclined from the inflection point Q in the middle of the inner container cone surface 4 toward the shoulder portion 20 of the inner container body 5. It is preferable that the inclination angle θ is in the range of 0 <θ ≦ + 15 degrees with respect to the horizontal sectional line of the shoulder portion 20. If the inclination angle θ exceeds 15 degrees, the shoulder 20 is deformed similarly to the related art, so that the deformation can be eliminated within the above range. In this case, it is assumed that the inclination angle θ in this case is naturally smaller than the inclination angle of the shoulder 20 of the inner container conical surface 4 with respect to the horizontal sectional line.

  The reinforcing portion 12 according to the third embodiment shown in FIG. 8 is located on the inner side from the inflection point Q in the middle of the inner container cone surface 4 in a direction opposite to the inclination direction of the reinforcing portion 12 according to the second embodiment. Toward the shoulder 20 of the container body 5, there is a planar reinforcing portion 13 composed of an inclined surface opposite to the inclined surface of the inner container conical surface 4, and the inclination angle θ is defined by a horizontal sectional line of the shoulder 20. On the other hand, it is appropriate that -15 degrees ≦ θ <0. If the inclination angle θ exceeds −15 degrees, the shoulder 20 is deformed similarly to the related art, so that the deformation can be eliminated within the above range.

  The reinforcing portion 12 according to the fourth embodiment shown in FIG. 9A is formed by a flange formed by folding a resin film constituting the inner container 2 so as to protrude outward from the entire periphery of the shoulder portion 20 of the inner container body 5. It is configured as a reinforcement member 14. The entire periphery of the shoulder portion 20 is reinforced by the flange-shaped reinforcing portion 14, and deformation of the shoulder portion 20 can be eliminated. In the example shown in FIG. 9B, the planar reinforcing portion 13 and the flange-shaped reinforcing portion 14 are combined, so that the entire circumferential strength of the shoulder portion 20 can be further increased.

  The reinforcing portion 12 according to the fifth embodiment shown in FIG. 10A is configured as a wedge-shaped reinforcing portion 15 formed at a position corresponding to the upper vertex 6. The vicinity of each upper vertex 6 is reinforced by the wedge-shaped reinforcing portion 15, and deformation occurring around the upper vertex 6 can be eliminated. In this case, it is desirable that an R curved surface 7 is formed between the upper vertices 6. In the example shown in FIG. 10B, the planar reinforcing portion 13 and the wedge-shaped reinforcing portion 15 are combined, so that the entire circumferential strength of the shoulder portion 20 can be further increased.

  The reinforcing portion 12 according to the sixth embodiment shown in FIG. 11A is configured as a convex annular reinforcing portion 16 having a semicircular cross section formed continuously around the shoulder portion 20. The entire circumference of the shoulder portion 20 is reinforced by the convex annular reinforcing portion 16, and the deformation of the shoulder portion 20 can be eliminated. Note that the example shown in FIG. 11B is configured by combining the planar reinforcing portion 13 and the convex annular reinforcing portion 16, whereby the circumferential strength of the shoulder portion 20 can be further increased. FIG. 12 is a perspective view thereof.

  As described in each of the above-described embodiments, the reinforcing portion 12 according to the present invention is formed around the shoulder 20 of the inner container body 5, and suppresses the deformation of the shoulder 20 due to the rotational shrinkage of the inner container body 5. This means includes various shapes and configurations other than those described in the above embodiments.

  As described above, the periphery of the shoulder portion 20 includes the reinforcing portion 12 or the planar reinforcing portion 13 formed of any one of the planar reinforcing portion 13, the flange-shaped reinforcing portion 14, the wedge-shaped reinforcing portion 15, and the convex annular reinforcing portion 16. It is reinforced by the reinforcing portion 12 composed of any one of the flange-shaped reinforcing portion 14, the wedge-shaped reinforcing portion 15, and the convex annular reinforcing portion 16, and suppresses the deformation of the shoulder portion 20 due to the rotational shrinkage of the inner container body 5. Further, by forming an R-curved surface between the upper vertices 6, the deformation of the shoulder portion 20 can be more reliably suppressed.

  As described above, the embodiment according to the present invention has been described. In each of the above-described embodiments, the rotational displacement angle of the corresponding upper vertex 6 and the lower vertex 8 is too small, or too large. In any case, since the rotation shrinkage of the inner container body 5 does not occur neatly, the angle is preferably in the range of 10 to 45 degrees.

  The inner container cone surface is not limited to the cone surface illustrated in FIG. 2, and may be a hexagonal pyramid surface, a heptagonal pyramid surface, or an octagonal pyramid surface according to the upper apex 6 of the inner container body 5.

  In the above-described embodiment, the horizontal section of the bottom portion 30 also has an R-curved surface, so that the bottom portion of the inner container body 5 does not deform and rises upward (vertically) while the bottom portion remains flat. Although it is possible to prevent accumulation of contents more effectively, only the shoulder 20 cross section may have an R-curved surface, and the bottom cross section may be formed in a regular n-sided shape.

  As described above, according to the inner container of the present invention, when the contents contained in the inside are discharged to the outside by the pump, the torsion is caused on the side of the body by the decompression, so that the body is vertically and radially oriented. By forming a reinforcing portion in the circumferential region of the shoulder where the inner container cone surface and the inner container body connect while the outer container contracts, the shoulder of the inner container does not deform and the shoulder has a predetermined shape. Only the body part shrinks cleanly in the vertical and radial directions while maintaining the same, so that the contents can be discharged to the outside without excess, and the volume reduction rate when disposing the inner container as garbage can be increased. it can.

DESCRIPTION OF SYMBOLS 1 Outer container 2 Inner container 3 Inner container neck 4 Inner container cone surface 5 Inner container trunk 6 Upper vertex 7 R curved surface 8 Lower vertex 9 Ridge line 10 Quadrilateral area 11 Valley bending habit line 12 Reinforcement part 13 Planar reinforcing part 14 Flange shape Reinforcement part 15 Wedge-shaped reinforcement part 16 Convex annular reinforcement part 20 Shoulder part 30 Bottom part 40 Stop-around prevention stopper 50 Vacuum pump 60 Suction nozzle

Claims (17)

An inner container for a double container in which a body is housed in an outer container having a cylindrical shape and a conical surface between a neck and a shoulder, and the contents are sucked by a vacuum pump and discharged to the outside. ,
The inner container is integrally formed of a soft resin, the inner container neck corresponding to the neck of the outer container, the inner container cone corresponding to the cone from the neck to the shoulder of the outer container, and the inner container trunk. Have
The inner container body,
The horizontal cross section of the shoulder and the bottom of the inner container is a regular n-sided polygon (n is any integer from 6 to 8), and has n upper vertices and n lower vertices,
The upper apex and the lower apex are relatively displaced by a fixed angle in plan view of the inner container,
On the side surface of the inner container body, a four-sided area surrounded by a ridge connecting all the upper vertices and the lower vertices corresponding one-to-one to all the upper vertices is formed,
A reinforcing portion for reinforcing the crushing strength around the shoulder of the inner container is formed in a circumferential region of the shoulder where the inner container cone surface and the inner container body are connected,
An inner container for a double container, characterized in that: The rotational displacement angle between the upper vertex and the lower vertex is 10 to 45 degrees.
The inner container for a double container according to claim 1, characterized in that: The reinforcing portion is a horizontal plane extending along a horizontal cross-section line of the shoulder of the inner container from the shoulder of the inner container toward the cone surface of the inner container in a vertical sectional view of the inner container,
The inner container for a double container according to claim 1 or 2, characterized in that: The reinforcing portion is a slope that extends obliquely with respect to a horizontal sectional line of the shoulder of the inner container from the shoulder of the inner container toward the cone surface of the inner container in a vertical sectional view of the inner container,
The inner container for a double container according to claim 1 or 2, characterized in that: The inclination angle of the inclined surface is within a range of +15 degrees to −15 degrees with respect to a horizontal sectional line of a shoulder portion of the inner container, and when the inclination angle is in a range of +, the inner container cone surface Less than the angle of inclination of the shoulder of the inner container relative to the horizontal section line,
The inner container for a double container according to claim 4, characterized in that: The reinforcing portion is a folded flange in which a resin film constituting the inner container projects outward from a shoulder of the inner container body and is folded.
The inner container for a double container according to claim 1 or 2, characterized in that: The four-sided area is a concave curved surface,
An inner container for a double container according to any one of claims 1 to 6, characterized in that: In the four-sided area, a valley fold line connecting the upper vertex and the diagonally lower vertex is formed.
The inner container for a double container according to any one of claims 1 to 7, characterized in that: An inner container for a double container in which a body is housed in an outer container having a cylindrical shape and a neck portion and a shoulder portion are formed as conical surfaces, and the contents are sucked out by a vacuum pump and discharged to the outside,
The inner container is integrally formed of a soft resin, the inner container neck corresponding to the neck of the outer container, the inner container cone corresponding to the cone from the neck to the shoulder of the outer container, and the inner container trunk. Have
The inner container body,
The horizontal cross section of the shoulder portion of the inner container has n upper vertices corresponding to vertices of a virtual regular n-sided polygon (n is any integer from 6 to 8). , Comprising an R curved surface having a curvature smaller than the inner surface curvature of the outer container,
The horizontal cross section of the bottom of the inner container has the same shape or a regular n-gon as the horizontal cross section of the shoulder of the inner container, and has n lower vertices,
The upper apex and the lower apex are relatively displaced by a fixed angle in plan view of the inner container,
On the side surface of the inner container body, a four-sided area surrounded by a ridge connecting all the upper vertices and the lower vertices corresponding one-to-one to all the upper vertices is formed,
A reinforcing portion for reinforcing the crushing strength around the shoulder of the inner container is formed in a circumferential region of the shoulder where the inner container cone surface and the inner container body are connected,
An inner container for a double container, characterized in that: The rotational displacement angle between the upper vertex and the lower vertex is 10 to 45 degrees.
An inner container for a double container according to claim 9, characterized in that: The reinforcing portion is a horizontal plane extending along a horizontal cross-section line of the shoulder of the inner container from the shoulder of the inner container toward the cone surface of the inner container in a vertical sectional view of the inner container,
The inner container for a double container according to claim 9 or 10, wherein: The reinforcing portion is a slope that extends obliquely with respect to a horizontal sectional line of the shoulder of the inner container from the shoulder of the inner container toward the cone surface of the inner container in a vertical sectional view of the inner container,
The inner container for a double container according to claim 9 or 10, wherein: The inclination angle of the inclined surface is within a range of +15 degrees to −15 degrees with respect to a horizontal sectional line of a shoulder portion of the inner container, and when the inclination angle is in a range of +, the inner container cone surface Less than the angle of inclination of the shoulder of the inner container relative to the horizontal section line,
An inner container for a double container according to claim 12, characterized in that: The reinforcing portion is a folded flange in which a resin film constituting the inner container projects outward from a shoulder of the inner container body and is folded.
The inner container for a double container according to claim 9 or 10, wherein: The four-sided area is a concave curved surface,
An inner container for a double container according to any one of claims 9 to 14, characterized in that: In the four-sided area, a valley fold line connecting the upper vertex and the diagonally lower vertex is formed.
An inner container for a double container according to any one of claims 9 to 15, characterized in that: The curvature of the R curved surface is a ratio of 0.2 to 0.6 with respect to the inner surface curvature of the outer container.
An inner container for a double container according to any one of claims 9 to 16, characterized in that: