JP2020172272A - container - Google Patents

Abstract

To provide a container that can be easily peeled off from a stack and allows the stack to stand upright vertically.SOLUTION: A peripheral wall part 2 of a container 100 includes a first peripheral wall part 21 and a second peripheral part 22, and the second peripheral wall part 22 includes a thick part 8. The peripheral wall part 21 extends from a lowermost end of the peripheral part 2, and the second peripheral wall part 22 is positioned following the first peripheral wall part 21 in a direction of an opening 3, and is tilted to the outside of the container 100 with respect to the first peripheral wall part 21. The thick part 8 inflates and protrudes toward an accommodation space 4 at a position facing the first peripheral wall part 21 of the inner container 100 at the time of stacking.SELECTED DRAWING: Figure 1

Description

The present invention relates to a container in which another container of the same shape and size is planned to be stacked in a container.

As a container for beverages or foods, a plastic container with a top opening and a bottom is generally used. The container has a bottom surface portion that seals the bottom surface side and a tubular body portion that surrounds the side surface of the storage space for food and drink. In addition, the container may have a hill because the peripheral wall portion serving as the body portion extends downward beyond the bottom surface portion. The upper surface of the container is open, and food and drink are filled in the storage space through the upper surface opening. After the food and drink are filled, if it is planned to be transported to the store and lined up at the store, a film is attached to the upper opening to seal the storage space. The film is made of a composite material such as aluminum and is attached to the top opening by heat fusion, for example.

The empty container is in a state called a stack during storage, transportation, transportation to the food and drink filling process and the film application process. A stack is a state in which other containers of the same shape and size are placed in a storage space and the containers are stacked in the height direction. For example, in a mass production filling factory line, a large number of stacked containers are installed in a container stacker in a plurality of rows. The stacked containers replenished to the supply section in the container stacker are conveyed to the bottom of the container by a belt conveyor. The stacked containers are peeled off one by one by the container supply device, dropped, and supplied to a container receiver for filling and sealing called a retainer.

If a large force is required to peel the container from the stack, peeling failure can occur. If peeling failure occurs, the container may be supplied to the retainer in an inclined state, or the container may not be set in the original drop position and damage may occur between the container supply device and the retainer. Should the container be damaged in the filling and pasting process, not only the line is stopped, but also the process is stopped due to the processing of the damage, which leads to a decrease in production efficiency. The reason why the force required to peel the container from the stack increases is that there is no gap between the peripheral walls of the containers that are vertically adjacent to each other due to the stack. If there is no gap, the contact area between adjacent containers becomes large, and the friction when peeling the containers becomes large.

Therefore, an inclination angle change point is provided on the peripheral wall portion, an upper inclination angle is set on the opening side of the inclination angle change point, a lower inclination angle is set on the lower end side of the inclination angle change point, and the upper part is above the lower inclination angle. A container having a large inclination angle has been proposed (see, for example, Patent Document 1). As a result, when the containers are stacked, a gap is created between the peripheral walls of the adjacent containers, the contact surface between the adjacent containers becomes small, and the containers can be easily peeled off.

Japanese Unexamined Patent Publication No. 2014-162527

The stacks should be upright, stacked vertically in a straight line. If the stack bends in a bow shape, the container may be scattered when the container is set in the container stacker. In addition, when the stack bends in an arch shape, the container supply device is due to the displacement difference between the container above the stack where the transfer force is not applied from the belt conveyor and the container below the stack where the transfer force is directly applied from the belt conveyor. There is a risk that it will not be transported properly.

One of the causes of the stack bending in an arch shape is that a gap is generated between the peripheral walls of two adjacent containers that are stacked. The gap provides room for tilting until the peripheral wall portion of the inner container of the two adjacent containers contacts the peripheral wall portion of the outer container. This chain of tilts bends the stack in a bow.

A container having an upper inclination angle and a lower inclination angle can be easily peeled off, but a gap is formed between the peripheral walls of adjacent containers, which causes a problem that the stack is easily bent like a bow. Specifically, in the adjacent containers, a region where the lower tilt angle of the container located inside and the upper tilt angle of the container located on the outside face each other is generated below the region where the upper tilt angles face each other. In the region where the lower inclination angle and the upper inclination angle face each other, the gap between the peripheral wall portions widens toward the upper surface opening. When the gap between the peripheral walls becomes large, there is room for the inner container to tilt with respect to the outer container so as to fill this gap, and the stack bends like a bow.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a container that can be easily peeled off from a stack and that the stack can easily stand upright. The purpose.

In order to achieve the above object, the container according to the embodiment of the present invention is a container having a top opening and a bottom, and forms a bottom surface portion forming the bottom surface of the accommodation space and a side surface portion of the accommodation space. The peripheral wall portion is provided with an endlessly continuous peripheral wall portion along the edge of the peripheral wall portion, and the peripheral wall portion extends from the lowermost end of the peripheral wall portion to a predetermined height toward the opening, and the direction of the opening. It has a second peripheral wall portion that is located following the first peripheral wall portion and falls outward from the first peripheral wall portion, and the second peripheral wall portion is the inner container that is vertically adjacent to each other when stacked. It is characterized by having a thick portion bulging toward the accommodation space at a position facing the first peripheral wall portion.

The thick portion covers a range in which the first peripheral wall portion of the inner container adjacent to each other vertically and the second peripheral wall portion of the outer container face each other during stacking, and has a length equal to or less than this range. It may extend in the height direction.

The peripheral wall portion has a hill extending below the bottom surface portion, the first peripheral wall portion extends to a height in the middle of the hill, and the second peripheral wall portion extends in the middle of the hill. It may extend from the height toward the upper surface opening.

It is provided with an inner surface protrusion formed by protruding from the inner peripheral surface of the peripheral wall portion toward the accommodation space side, and an outer surface concave portion formed by recessing the outer peripheral surface of the peripheral wall portion with a size capable of engaging with the inner surface protrusion portion. Even if the inner surface protrusion and the outer surface recess are provided at positions where the outer surface recess of the inner container vertically adjacent to each other and the inner surface protrusion of the outer container face each other at the same height position at the time of stacking. Good.

The thick portion may extend in the height direction starting from the upper end of the inner surface protrusion portion.

The thick portion may narrow the gap between the inner containers that are vertically adjacent to each other at the time of stacking and the first peripheral wall portion.

According to the present invention, the container can be easily peeled off from the stack, and the stack of containers can be easily upright.

It is a figure which shows the container, the left side from the axis represented by a dotted line is a side view of a container, and the right side is a sectional view of a container. It is sectional drawing near the hill of a container. It is sectional drawing near the boundary of the bottom surface part and the peripheral wall part of a container. It is an enlarged sectional view of the lower side of a container in a state where the container is stacked.

The container according to the embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, the thickness, dimensions, positional relationship, ratio, etc. are emphasized for easy understanding. Further, the bottom side of the container is referred to as a lower side or a lower side, and the opening side is referred to as an upper side or an upper side.

(Constitution)
FIG. 1 is a side view and a side sectional view of the container according to the present embodiment. The container 100 is manufactured by injection molding using a plastic such as polypropylene as a material, and has a bottom surface portion 1 and a tubular peripheral wall portion 2 continuous along the edge of the bottom surface portion 1. The peripheral wall portion 2 extends and expands both vertically and vertically with reference to the bottom surface portion 1. The upper part of the container 100 is an opening 3 defined by an annular peripheral wall portion 2.

The bottom surface portion 1 is the bottom surface of the storage space 4 filled with food and drink. The peripheral wall portion 2 above the bottom surface portion 1 is a body portion 5 that defines a side surface that surrounds the accommodation space 4 all around. The peripheral wall portion 2 below the bottom surface portion 1 serves as a hill 6 which is also called a thread tail or a thread bottom. The opening 3 is an inlet for food and drink in the food and drink filling process, and an outlet for food and drink during eating and drinking. The rim 31 around the opening 3 is extended to the outside of the container 100 to be wide, and is a film attachment area covering the opening 3.

Each configuration will be described in detail. First, the bottom surface portion 1 has a disk-shaped outer shape. The surface of the bottom surface portion 1 has a spherical shell shape slightly bulging toward the accommodation space 4. The rigidity of the bottom surface portion 1 is enhanced by the surface bulging into a spherical shell shape. The bottom surface portion 1 is not limited to a disk shape. As the outer shape of the bottom surface portion 1, various shapes such as an ellipse, a rectangle, a square, a pentagon, a hexagon, an octagon, and other polygons can be applied.

The peripheral wall portion 2 has a diameter gradually increased upward so that the opening 3 side has a relatively large diameter with respect to the bottom surface portion 1 side, and has an inverted frustum shape as a whole. Therefore, the hill 6 of the container 100 has a smaller diameter than the opening 3, and the container 100 can be inserted into another container 100 having the same shape and size. That is, the container 100 can be stacked. The peripheral wall portion 2 is vertically divided into a first peripheral wall portion 21 and a second peripheral wall portion 22 with an inclination angle change point 23 as a boundary, and has an outer surface recess 71 on the outer peripheral surface and an inner surface protrusion portion on the inner peripheral surface. It has 72, and further has a thick portion 8 on the inner peripheral surface of the second peripheral wall portion 22.

As shown in FIGS. 1 to 3, the inclination angle change point 23 is a boundary where the inclination angle of the peripheral wall portion 2 changes, and is provided in the middle of the height from the lowermost end of the container 100 toward the mouth edge 31. The first peripheral wall portion 21 is a peripheral wall portion 2 from the lowermost end of the container 100 to the inclination angle change point 23, and the peripheral wall extends straight while maintaining the first inclination angle a1. The second peripheral wall portion 22 is a peripheral wall portion 2 from the inclination angle change point 23 to just before the mouth edge 31, and the peripheral wall extends straight while maintaining the second inclination angle a2.

The first inclination angle a1 and the second inclination angle a2 are angles at which the container 100 is tilted outward with respect to the vertical. The first inclination angle a1 is obtained by measuring the outer peripheral surface of the peripheral wall portion 2, and the second inclination angle a2 is a portion of the inner peripheral surface of the peripheral wall portion 2 in contact with the accommodation space 4 in which the thick portion 8 is not formed. Is obtained by measuring. The second inclination angle a2 is larger than the first inclination angle a1. That is, the peripheral wall portion 2 gradually expands in diameter from the lowermost end to the inclination angle change point 23 while maintaining the first inclination angle a1, but from the inclination angle change point 23 onward, the degree of expansion is increased to the second inclination angle a2. The diameter is gradually increased while maintaining the second inclination angle a2.

When the containers 100 are stacked on top of the first peripheral wall portion 21 of the first inclined angle a1 and the second peripheral wall portion 22 of the second inclined angle a2 larger than the first inclined angle a1 is connected, the inner and outer containers 100 A gap is created in the region where the second peripheral wall portions 22 face each other, and the second peripheral wall portion 22 of the inner and outer containers 100 extends in parallel while keeping the gap constant. Therefore, when the containers 100 are stacked, the contact surface where the peripheral wall portions 2 of the adjacent containers 100 come into contact with each other becomes smaller, and the containers 100 can be easily peeled off. When the containers 100 are stacked, the wall thickness of the second peripheral wall portion 22 is uniform, paying attention to the region where the second peripheral wall portions 22 of the inner and outer containers 100 face each other.

Here, the outer peripheral surface of the second peripheral wall portion 22 becomes the curved surface printing area 22a. The curved surface printing area 22a is an area in which a trademark of food and drink, a trade name of a provider or a seller, a component of contents, a pattern that stimulates demand, and other display items for consumers are printed on a curved surface. The curved surface printing is a decorative printing method in which a straight-shaped ink plate of the same color is transferred to a rubber-shaped plate called a straight-shaped printing blanket, and the container is rotated and transferred to the curved surface printing area 22a. Therefore, if the curved surface printing area 22a extends over the first peripheral wall portion 21, the curved surface printing must be divided into two times, which is complicated and may cause printing misalignment. Therefore, the curved surface printing area 22a is secured in the second peripheral wall portion 22 and does not reach the first peripheral wall portion 21.

Then, in order to make the curved surface printing area 22a as wide as possible, in other words, to secure the second peripheral wall portion 22 in a large area, the inclination angle change point 23 is provided by lowering it to the middle of the hill 6. Further, in curved surface printing, depending on the material to be printed, it is necessary to roughen the surface of the container by corona discharge to improve printability. For corona discharge, it is necessary to sandwich a jig on the inner surface side of the container, and it is necessary to leave a certain distance from the hill 6. Therefore, it is desirable to set the position of the inclination angle change point 23 of the second peripheral wall portion 22 to be joined to the hill 6 below the position to be joined to the bottom portion 1.

Therefore, the first peripheral wall portion 21 rises from the lowermost end of the hill 6, the peripheral wall portion 2 changes to the second inclination angle a2 from the middle of the hill 6, and the second peripheral wall portion 22 rises. In this case, all the peripheral wall portions 2 in contact with the accommodation space 4 belong to the second peripheral wall portion 22, and when the containers 100 are stacked, the first peripheral wall portion 21 and the outer container 100 are connected from the lowermost end of the inner container 100. The area facing the second peripheral wall portion 22 begins. From the upper end of the second peripheral wall portion 22 to the rim 31, the strength of the rim 31 is reinforced, or the diameter is increased to prevent rattling of the retainer, so that the strength of the rim 31 is reinforced rapidly. The diameter may be increased to form the step portion 24.

The outer surface recess 71 and the inner surface protrusion 72 have corresponding shapes that can be fitted. The outer surface recess 71 is formed on the outer surface of the first peripheral wall portion 21, and the outer surface of the hill 6 is recessed. The outer surface recess 71 extends at the same height over the entire circumference to form an annular shape. The outer surface recess 71 has a gentle slope 71a and a steep slope 71b, and is dented so as to gradually deepen at a gentle angle from the bottom to the top, and the dent disappears sharply when a certain height is reached. .. The gentle slope portion 71a is a portion that is recessed from the bottom to the top so as to gradually deepen at a gentle angle, and the steep slope portion 71b is a portion where the recess is rapidly eliminated.

On the other hand, the inner surface protrusion 72 is formed on the inner surface of the second peripheral wall portion 22, and the inner surface of the body portion 5 is formed by protrusion. The inner surface protrusion 72 extends at the same height over the entire circumference to form an annular shape. Then, the inner surface protrusion 72 is installed so that when another container 100 having the same shape and the same size is inserted into the accommodation space 4 and the toe 61 lands on the bottom surface portion 1, the inner surface protrusion 72 fits into the outer surface recess 71 without a gap. The height, installation range, and protrusion amount are adjusted, and the protrusion shape matches the recess space of the outer surface recess 71. That is, the inner surface protrusion 72 has a gentle slope portion 72a and a steep slope portion 72b, and swells gradually from the bottom to the top at a gentle angle, and when it reaches a certain height, the bulge suddenly expands. Eliminate. The gentle slope portion 72a is a portion that gradually rises from the bottom to the top at a gentle angle, and the steep slope portion 72b is a portion where the bulge is abruptly eliminated.

For example, the outer surface recess 71 has a recessed lower end at a position of height H1 from the lowermost end of the container 100, and extends to a range of height H2 with reference to the lower end of the recess. It is assumed that the deepest portion of the outer surface recess 71 is generated at a position of height H3 with reference to the lower end of the recess, and has a depth D1 with reference to the outer peripheral surface of the first peripheral wall portion 21. Further, consider a virtual line VL in which the inner bottom surface of the bottom surface portion 1 of the container 100 in contact with the accommodation space 4 is set as the starting end, and the inner peripheral surface of the peripheral wall portion 2 extending to the lower end of the inner surface protrusion portion 72 is extended straight. At this time, the lower end of the recess of the outer surface recess 71 of the inner containers 100 vertically adjacent to each other in the stacked state is separated from the virtual line VL of the outer container 100 by a distance D2 along the radial direction of the container 100, and has the deepest portion. In terms of height, it is assumed that the distance is further separated by the distance D3 from the point where the depth is zero.

At this time, the inner surface protrusion 72 bulges slightly below the position of the height H1 from the inner bottom surface of the bottom surface portion 1 in contact with the accommodation space 4, and serves as the starting end. It bulges from the inner peripheral surface of 2 by a distance D2. The inner surface protrusion 72 is based on the height that bulges by the distance D2, and the most bulge is at the position of the height H3 from this reference, and the most bulge length is the depth D1 of the deepest part of the outer surface recess 71. The length is the sum of the distance D3 at this point. The inclination angle of the gently inclined portion 72a of the inner surface protrusion 72 is the same as the inclination angle of the gently inclined portion 71a of the outer surface recess 71. Both the portion where the dent of the outer surface recess 71 is rapidly eliminated and the portion where the bulge of the inner surface protrusion 72 is rapidly eliminated are arcuate, and the radius of the arc is the same.

The outer peripheral surface of the toe 61 of the hill 6 is thinly scraped before reaching the outer surface recess 71 to form a thin wall portion 73. As a result, the hill 6 of the inner container 100 gets over the inner surface protrusion 72, and the inner surface protrusion 72 and the outer surface recess 71 are easily fitted.

Next, the thick portion 8 is a region of the second peripheral wall portion 22 in which the wall is thicker than the wall above the thick portion 8, and the inner peripheral surface in contact with the accommodation space 4 bulges out. It is a part. Here, it is assumed that the inclination angle change point 23 is set to the height H4 from the lowermost end of the container 100. At this time, the thick portion 8 extends from the upper end of the inner surface protrusion 72 to the maximum height H4 with reference to the inner surface in contact with the accommodation space 4 of the bottom surface 1. The outer peripheral surface of the second peripheral wall portion 22 is flat in the entire area.

When the containers 100 are stacked, the thick portion 8 faces the first peripheral wall portion 21 of the inner container 100, and narrows the gap between the thick portion 8 and the outer peripheral surface of the first peripheral wall portion 21. Here, assuming that the second peripheral wall portion 22 is not provided with the thick portion 8, at the height of the bottom surface portion 1, the outer peripheral surface of the first peripheral wall portion 21 of the inner container 100 and the second of the outer container 100. It is assumed that the inner peripheral surface of the peripheral wall portion 22 has a gap having a length S1. At this time, the gap S2 between the first peripheral wall portion 21 and the second peripheral wall portion 22 is S2 = S1 + H5 × (tan (a2) -tan (a1)) at a point having a height H5 with respect to the bottom surface portion 1. Will be.

The thick portion 8 has a thickness so as to make the gap S2 as narrow and constant as possible within the range in which the thick portion 8 extends. That is, the thickness T1 of the thick portion 8 is T1 = [S1 + H5 × (tan (a2) -tan (a1))] -S3 at the point of height H5 with reference to the upper end position of the inner surface protrusion 72. Is set to. If the wall thickness of the second peripheral wall portion 22 where there is no wall thickness portion 8 is T2 in the radial direction of the container, the wall thickness from the outer peripheral surface to the inner peripheral surface of the second peripheral wall portion 22 is set at the point of the wall thickness portion 8. The wall thickness T3 is T3 = T2 + T1 as measured along the radial direction of the container.

In addition, the outer peripheral surface of the hill 6 is bent in the middle due to the presence of the inclination angle change point 23, but the inner peripheral surface of the hill 6 rises at the same inclination angle. On the other hand, the inner peripheral surface of the hill 6 is inclined so as to enter the inside of the container 100 from the toes 61 to the base in contact with the bottom surface 1. That is, the base of the hill 6 is formed to be thick due to the existence of the inclination angle change point 23 and the inclination so that the inner peripheral surface enters the inside, and the toe 61 of the hill 6 is thin. It is tapered so that it becomes.

Therefore, the inner circumference of the hill 6 on the root side is smaller than the inner diameter of the toes. Due to this shape relationship, when another container 100 is inserted and the sole of the hill 6 is landed on the bottom surface portion 1, the other container 100 is supported on the hill 6. Therefore, even if pressure is applied from the vertical direction of the stack, the container 100 is less likely to be damaged, such as the bottom surface portion 1 being cracked.

(Action)
FIG. 4 shows a state in which the containers 100 are stacked. The inner container 100 is put into the outer container 100 and stacked through the opening 3 of the outer container 100. The inner container 100 is placed and stacked in the outer container 100 from the hill 6 side.

The toe 61 of the peripheral wall portion 2 is a thin-walled portion 73 whose outer peripheral surface is shaved. Further, the outer surface recess 71 is formed by recessing the outer peripheral surface of the peripheral wall portion 2. Therefore, when the toe 61 of the peripheral wall portion 2 passes through the thick portion 8, the toe 61 of the peripheral wall portion 2 does not slide on the thick portion 8. Therefore, the inner container 100 can be easily inserted into the outer container 100 even by the presence of the thick portion 8.

Further, the space defined by the bottom surface 1 of the outer container 100, the thick portion 8 of the outer container 100, and the hill 6 of the inner container 100 increases in volume as the insertion of the container 100 progresses. I will reduce it. At this time, a gap is secured between the toes 61 of the peripheral wall portion 2 and the thick portion 8 by the thin portion 73 and the outer surface recess 71, and the presence of the thick portion 8 may cause so-called air tightness. There is no. Airtight refers to a state in which air cannot escape from the volume reduction space.

Then, during the insertion of the container 100, when the toe 61 of the inner container 100 passes through the inner protrusion 72 of the outer container 100, the contact area between the toe 61 and the inner protrusion 72 due to the presence of the thin portion 73 Is getting smaller. Therefore, if the inner container 100 is slightly bent and deformed, the toes 61 of the inner container 100 can get over the inner protrusion 72.

Further, when the toe 61 gets over the inner protrusion 72, the outer recess 71 has a gently sloping portion 71a that gradually deepens from the bottom to the top, so that the toe 61 of the inner container 100 has an elastic force to recover from bending deformation. The inner container 100 is guided so as to slide toward the bottom of the outer container 100.

Both the outer surface recess 71 and the inner surface protrusion 72 have gently tilted portions 71a and 72a and steeply inclined portions 71b and 72b having the same shape. Therefore, when the toe 61 of the inner container 100 lands on the bottom surface portion 1 of the outer container 100, the inner surface protrusion 72 of the outer container 100 is fitted into the outer surface recess 71 of the inner container 100. As a result, a blocking force is generated at the time of stacking.

At the time of stacking, the outer surface recess 71 and the steeply inclined portions 71b and 72b of the inner surface protrusion 72 are in contact with each other. At the time of this stacking, it is assumed that a downward force is applied to the inner container 100 so as to proceed beyond the bottom surface portion 1 of the outer container 100. The steeply inclined portions 71b and 72b of the outer surface concave portion 71 and the inner surface protruding portion 72 are stepped portions in which the recesses are rapidly eliminated, and are stepped portions in which the recesses are rapidly withered. Therefore, when a downward force is applied, the outer surface recess 71 and the steeply inclined portions 71b and 72b of the inner surface protrusion 72 first collide with each other to receive the downward force. Therefore, the downward pressure exerted by the toes 61 of the inner container 100 on the bottom surface 1 of the outer container 100 is weakened. Therefore, the possibility of damaging the bottom surface 1 of the outer container 100 during stacking is suppressed.

Further, at the time of stacking, the second peripheral wall portion 22 of the outer container 100 faces the first peripheral wall portion 21 of the inner container 100. In the height range where the outer surface recess 71 and the inner surface protrusion 72 are fitted in this facing region, the gap between the inner container 100 and the outer container 100 is filled. That is, in the range where the outer surface recess 71 and the inner surface protrusion 72 are fitted, there is no room for the inner container 100 to tilt with respect to the outer container 100. Therefore, the inner and outer containers 100 can easily stand upright without bending in a bow shape.

Further, a thick portion 8 is formed on the second peripheral wall portion 22 of the outer container 100 facing the first peripheral wall portion 21 of the inner container 100. In the region where the first peripheral wall portion 21 and the second peripheral wall portion 22 face each other, if there is no thick portion 8, the gap becomes wider toward the upper side. However, in the thick portion 8, the gap between the first peripheral wall portion 21 and the second peripheral wall portion 22 is narrowed and made constant. Therefore, there is less room for the inner container 100 to tilt with respect to the outer container 100, and the thick portion 8 also makes it easier for the inner and outer containers 100 to stand upright vertically.

As described above, below the inner container 100, the outer surface recess 71, the inner surface protrusion 72, and the thick portion 8 each function to fill or narrow the gap between the inner and outer containers 100. Therefore, there is less room for the inner container 100 to tilt with respect to the outer container 100, and the stack tends to be vertical. The outer surface recess 71, the inner surface protrusion 72, and the thick portion 8 are set as below the container 100 as possible. This is because the degree of tiltability is smaller when the container 100 is set below the container 100 than when the container 100 is set above the container 100.

Next, when the inner container 100 is peeled off from the stack, a certain gap is maintained at a position where the second peripheral wall portions 22 of the inner and outer containers 100 face each other, so that the contact area of the inner and outer containers 100 becomes smaller. , The inner container 100 can be easily peeled off from the stack. Further, since the outer surface recess 71 has a gently sloping portion 71a that gradually becomes shallower downward from the deepest portion, the toe 61 of the inner container 100 bends little by little, and even a slight peeling force exerts a blocking force. Can be released.

(effect)
As described above, the peripheral wall portion 2 of the container 100 has a first peripheral wall portion 21 and a second peripheral wall portion 22, and the second peripheral wall portion 22 has a thick wall portion 8. The first peripheral wall portion 21 extends from the lowermost end of the peripheral wall portion 2 to a height in the middle of the hill 6, and the second peripheral wall portion 22 is located following the first peripheral wall portion 21 in the direction of the opening 3, and is the first. It has fallen to the outside of the container 100 from the peripheral wall portion 21. The thick portion 8 was bulged toward the accommodation space 4 at a position facing the first peripheral wall portion 21 of the inner container 100 at the time of stacking.

By setting the first peripheral wall portion 21 and the second peripheral wall portion 22 on the peripheral wall portion 2 in this way, the container 100 can be easily peeled off from the stack. Further, by setting the inclination angle change point 23 in the middle of the hill 6, the second peripheral wall portion 22 that becomes the curved surface printing area 22a can be widened. In this case, the portion where the first peripheral wall portion 21 of the inner container 100 and the second peripheral wall portion 22 of the outer container 100 face each other and the gap becomes wide when stacked is from the lowermost end of the inner container 100. It will occur. However, the area where the first peripheral wall portion 21 and the second peripheral wall portion 22 face each other at the time of stacking is maintained at a constant gap by the thick portion 8. Therefore, there is less room for the inner container 100 to lean against the outer container 100, and the stack is less likely to bend in a bow shape. That is, the stack tends to stand upright vertically.

In order to make it easier for the stack to stand upright vertically, it is conceivable to extend the first peripheral wall portion 21 in the height direction until the stack exceeds the hill 6 and sufficiently enters the body portion 5. In this case, a region where the first peripheral wall portions 21 of the inner and outer containers 100 face each other is generated with a sufficient length from the lowermost end of the inner container 100. Then, even if the inner container 100 tries to fall down so as to lean against the outer container 100, the inner container 100 is caught at the position of the inclination angle change point 23 of the outer container 100. That is, the maximum inclination is such that the gap between the first peripheral wall portions 21 is filled. Therefore, even if the thick portion 8 is not provided, the angle at which the inner container 100 collapses into the outer container 100 becomes small, and the stack is less likely to bend in a bow shape.

However, if the first peripheral wall portion 21 extends sufficiently into the body portion 5, the second peripheral wall portion 22 becomes a small area, and the curved surface printing area 22a having a satisfactory size cannot be obtained. Therefore, it is desirable that the first peripheral wall portion 21 has a height in the middle of the hill 6, and then the presence of the thick portion 8 is useful for erecting the stack vertically.

Of course, even if the first peripheral wall portions 21 face each other, if the facing area is not sufficient, the collapse of the inner container 100 cannot be sufficiently regulated. In this case, even if the first peripheral wall portion 21 extends until it enters the body portion 5, the presence of the thick portion 8 is useful for standing the stack vertically. Specifically, when the height of the first peripheral wall portion 21 exceeds the inner bottom surface of the bottom surface portion 1 and falls within a range of up to half or less of the height dimension of the first peripheral wall portion 21, the first peripheral wall portion 21 The collapse of the inner container 100 cannot be sufficiently regulated by the areas where they face each other. Therefore, the thick portion 8 becomes useful.

That is, the first peripheral wall portion 21 extends from the lowermost end of the peripheral wall portion 2 toward the opening 3 beyond the hill 6 to a predetermined height, and the second peripheral wall portion 22 is an inner container vertically adjacent to each other when stacked. Even if the thick portion 8 bulging toward the accommodation space 4 is provided at a position facing the first peripheral wall portion 21 of the 100, the stack can easily stand upright vertically.

The thick portion 8 has a length equal to or less than this range in a range where the first peripheral wall portion 21 of the inner container 100 and the second peripheral wall portion 22 of the outer container 100 which are vertically adjacent to each other at the time of stacking face each other. It suffices to extend over in the height direction. The length of the thick portion 8 from the start end to the end in the height direction may be 30% or more of the height H4 of the first peripheral wall portion 21. If a certain narrow gap or a gap is filled over a range of 30% or more of the height H4 of the first peripheral wall portion 21, the stack can easily stand upright vertically.

When the inner surface protrusion 72 and the outer surface recess 71 cover a range of 10% or more of the height H4 of the first peripheral wall portion 21 in the height direction, the inner surface protrusion 72 also engages with the outer surface recess 71. It functions as a part of the thick portion 8 that further bulges. Therefore, the range of 10% or more of the height H4 of the first peripheral wall portion 21 with respect to the thick portion 8 can be based on the lowermost end of the inner surface protrusion 72 that comes into contact with the outer surface recess 71.

Further, the target of engagement with the inner surface protrusion 72 is the outer surface recess 71, and the outer surface recess 71 is formed so that the outer peripheral surface of the peripheral wall portion 2 is recessed. As a result, when the containers 100 are stacked, it is possible to prevent the object of engagement with the inner surface protrusion 72 from sliding on the thick portion 8 and making it difficult to stack the containers 100. Further, since the inner surface protrusion 72 and the outer surface recess 71 also function as a part of the thick portion 8, it is possible to further suppress the stacked container 100 from bending in an arch shape.

The inner surface protrusions 71 may extend at the same height over the entire circumference to form an annular shape, or may be formed in a plurality of intermittent short lines at the same height. Therefore, the outer surface recesses 72 may also extend at the same height over the entire circumference to form an annular shape, or may be formed in a plurality of intermittent short lines at the same height.

Further, the second peripheral wall portion 22 may extend outward from the first peripheral wall portion 21, and the first inclination angle a1 may have a negative value, that is, may be tilted toward the inside of the container 100. However, from the viewpoint of releasability, it is desirable that the first inclination angle a1 is at least 0 °, and more preferably, the first inclination angle a1 is a positive value in consideration of the draft.

Further, the second peripheral wall portion 22 may be consistently formed up to the rim 31, or peripheral walls having different inclination angles may be stacked on the second peripheral wall portion 22.

1 Bottom part 2 Circumferential wall 21 1st peripheral wall 22 2nd peripheral wall 22a Curved surface printing area 23 Tilt angle change point 3 Opening 31 Mouth edge 4 Accommodation space 5 Body 6 Height 61 Foot 71 Outer surface recess 71a Gentle slope 71b Sudden Slope 72 Inner surface protrusion 72a Slow slope 72b Steep slope 73 Thin part 8 Thick part 100 Container

Claims (6)

A container with a top opening and a bottom
The bottom part that forms the bottom of the accommodation space and
A peripheral wall portion that forms a side surface of the accommodation space and is continuous in an endless manner along the edge of the bottom surface portion.
With
The peripheral wall portion
A first peripheral wall portion extending from the lowermost end of the peripheral wall portion to a predetermined height toward the opening,
A second peripheral wall portion that is located following the first peripheral wall portion in the direction of the opening and falls outward from the first peripheral wall portion.
Have,
The second peripheral wall portion has a thick portion that bulges toward the accommodation space at a position facing the first peripheral wall portion of the inner containers that are vertically adjacent to each other when stacked.
A container characterized by. The thick portion covers a range in which the first peripheral wall portion of the inner container adjacent to each other vertically and the second peripheral wall portion of the outer container face each other during stacking, and has a length equal to or less than this range. Extending in the height direction,
The container according to claim 1. The peripheral wall portion has a hill extending below the bottom surface portion.
The first peripheral wall portion extends to a height in the middle of the hill, and
The second peripheral wall portion extends from a height in the middle of the hill toward the upper surface opening.
2. The container according to claim 2. An inner protrusion formed by protruding from the inner peripheral surface of the peripheral wall portion toward the accommodation space, and
An outer surface recess formed by denting the outer peripheral surface of the peripheral wall portion with a size capable of engaging with the inner surface protrusion,
With
The inner surface protrusion and the outer surface recess are provided at positions where the outer surface recess of the inner container vertically adjacent to each other and the inner surface protrusion of the outer container face each other at the same height position when stacked.
The container according to any one of claims 1 to 3. The thick portion extends in the height direction starting from the upper end of the inner projection portion.
4. The container according to claim 4. The thick portion narrows the gap between the inner container vertically adjacent to the first peripheral wall portion at the time of stacking.
The container according to any one of claims 1 to 5.

Images