JP7435992B2 - container - Google Patents

Description

The present invention relates to a container that is intended to be stacked with other containers of the same shape and size inside the container.

BACKGROUND ART Plastic containers with an open top and a bottom are commonly used as containers for beverages or foods. The container has a bottom portion that seals the bottom side of the food/drink storage space, and a cylindrical body portion that surrounds the entire side surface. Further, the container may have a raised platform because the peripheral wall portion serving as the body extends downward beyond the bottom portion. The top surface of the container is open, and food and drink are filled into the storage space from the top surface opening. After the food and drinks have been filled, if the container is scheduled to be transported to a store and displayed on the shelf, a film is attached to the top opening and the storage space is sealed. The film is made of a composite material such as aluminum, and is attached to the top opening by, for example, heat fusion.

Empty containers are in a state called a stack during storage, transportation, and transport to the food and drink filling process and film attachment process. Stack refers to a state in which containers of the same shape and size are placed in a storage space and stacked on top of each other in the height direction. For example, in a mass production filling factory line, a large number of stacked containers are installed in multiple rows on a container stacker. The stacked containers refilled in the supply section of the container stacker are conveyed along the bottom of the container by a belt conveyor. The stacked containers are peeled off and dropped one by one by a container supply device, and are supplied to a container receiver called a retainer for filling and sealing.

If a large amount of force is required when peeling the container from the stack, peel failures can occur. If a peeling failure occurs, there is a risk that the container may be fed to the retainer in an oblique state, or the container may not be set at the original dropping position, causing damage between the container feeding device and the retainer. In the unlikely event that a container is damaged during the filling and pasting process, not only will the line be stopped, but the process will also be halted to deal with the damage, leading to a drop in production efficiency. If we look at the shape of the containers as a reason why the force required to peel them off from the stack increases, it can be said that the stack does not have any gaps between the peripheral walls of the containers that are vertically adjacent to each other. If there is no gap, the contact area between adjacent containers will be large, and the friction when peeling the containers apart will be large.

Therefore, an inclination angle change point is provided on the peripheral wall, the upper inclination angle is set closer to the opening than the inclination angle change point, the lower inclination angle is set to the lower end side of the inclination angle change point, and the upper inclination angle is set above the lower inclination angle. A container with 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 adjacent containers, the contact surface between adjacent containers becomes small, and the containers can be easily peeled off.

Japanese Patent Application Publication No. 2014-162527

The stack should be stacked vertically in a straight line and stand upright. If the stack bends in an arched shape, there is a risk that the containers will be scattered when they are set on the container stacker. In addition, if the stack bends in an arched shape, the container feeding device will There is a risk that the product will not be transported properly.

One of the reasons why the stack bends in an arched shape is that a gap is created between the peripheral walls of two adjacent stacked containers. The gap is a space that allows the peripheral wall of the inner container to tilt between two adjacent containers until it contacts the peripheral wall of the outer container. This chain of tilts causes the stack to bow.

Although containers having upper and lower inclination angles can be easily peeled off, a problem arises in that the stack tends to bend in an arched manner because a gap is created between the peripheral walls of adjacent containers. Specifically, in adjacent containers, a region where the lower inclination angle of the inner container and the upper inclination angle of the outer container face each other occurs below the region where the upper inclination angles of the containers 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 opening. When the gap between the peripheral walls becomes large, there is room for the inner container to lean against the outer container so as to fill the gap, causing the stack to bend in an arched manner.

The present invention was proposed to solve the above-mentioned problems, and its purpose is to provide a container that can be easily peeled off from a stack and that allows the stack to stand vertically. purpose.

In order to achieve the above object, a container according to an embodiment of the present invention is a container with an open top and a bottom, and has a bottom portion forming the bottom surface of the storage space, and a bottom portion forming the side surface of the storage space. a peripheral wall portion that continues endlessly along the edge of the peripheral wall portion, and the peripheral wall portion includes a first peripheral wall portion that extends from the lowest end of the peripheral wall portion to a predetermined height toward the opening, and a first peripheral wall portion that extends in the direction of the opening. and a second peripheral wall part located next to the first peripheral wall part and tilting outward from the first peripheral wall part, and the second peripheral wall part is arranged so that the second peripheral wall part is located next to the first peripheral wall part, and when stacked, the second peripheral wall part It is characterized in that it has a thick wall portion that bulges toward the housing space at a position facing the first peripheral wall portion.

The thick portion extends over a length equal to or less than the range in which the first circumferential wall portion of the vertically adjacent inner container and the second circumferential wall portion of the outer container face each other during stacking. It may be made to extend in the height direction.

The peripheral wall part has a height extending below the bottom part, the first peripheral wall part extends to a height halfway up the height, and the second peripheral wall part has a height halfway up the height. It may be made to extend toward the upper surface opening from the height.

an inner surface projection protruding from the inner peripheral surface of the peripheral wall toward the accommodation space; and an outer surface recess formed by recessing the outer peripheral surface of the peripheral wall to a size that allows engagement with the inner surface projection, The inner surface protrusion and the outer surface recess may be arranged such that the outer surface recess of the vertically adjacent inner container and the inner surface projection of the outer container are located at the same height and face each other when stacked. good.

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

The thick portion may narrow a gap between the first peripheral wall portions of vertically adjacent inner containers when stacked.

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

It is a figure which shows a container, the left side of the axis|shaft represented by a dotted line is a side view of a container, and the right side is a sectional view of a container. FIG. 3 is a sectional view of the vicinity of the elevated area of the container. FIG. 3 is a cross-sectional view of the vicinity of the boundary between the bottom surface and the peripheral wall of the container. FIG. 3 is an enlarged sectional view of the lower side of the containers in a stacked state.

A container according to an embodiment of the present invention will be described in detail with reference to the drawings. In each drawing, thickness, dimensions, positional relationships, ratios, etc. are emphasized for ease of understanding. Furthermore, the bottom side of the container is referred to as the lower side or lower side, and the open side is referred to as the upper side or upper side.

(composition)
FIG. 1 is a side view and a side sectional view of a container according to this embodiment. The container 100 is manufactured by injection molding using plastic such as polypropylene as a material, and has a bottom part 1 and a cylindrical peripheral wall part 2 that continues endlessly along the edge of the bottom part 1. The peripheral wall portion 2 extends and expands both upward and downward with the bottom surface portion 1 as a reference. The upper part of the container 100 is an opening 3 defined by an annular peripheral wall 2.

The bottom surface part 1 becomes the bottom surface of the storage space 4 filled with food and drink. The peripheral wall section 2 above the bottom surface section 1 serves as a body section 5 that defines a side surface that surrounds the entire circumference of the accommodation space 4 . The peripheral wall section 2 below the bottom surface section 1 serves as a platform 6, which is also called a thread tail or thread bottom. The opening 3 is an inlet for food and drink in the food and drink filling process, and is also an outlet for taking out food and drink at the time of eating and drinking. A rim 31 around the opening 3 is expanded outward from the container 100 and becomes wider, and is an area to which a film covering the opening 3 is attached.

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

The circumferential wall portion 2 gradually increases in diameter upward so that the opening 3 side has a relatively larger diameter than the bottom surface portion 1 side, and has an inverted truncated pyramid shape as a whole. Therefore, the platform 6 of the container 100 has a smaller diameter than the opening 3, so that another container 100 of the same shape and size can be inserted into the container 100. That is, the containers 100 are stackable. This peripheral wall part 2 is vertically divided into a first peripheral wall part 21 and a second peripheral wall part 22 with the inclination angle change point 23 as a boundary, and also has an external recess 71 on the outer peripheral surface and an internal protrusion on the inner peripheral surface. 72, and further has a thick wall portion 8 on the inner peripheral surface of the second peripheral wall portion 22.

As shown in FIGS. 1 to 3, the inclination angle changing point 23 is a boundary where the inclination angle of the peripheral wall portion 2 changes, and is provided midway in the height from the lowest end of the container 100 toward the mouth edge 31. The first peripheral wall part 21 is the peripheral wall part 2 from the lowest end of the container 100 to the inclination angle changing point 23, and the peripheral wall extends straight while maintaining the first inclination angle a1. The second peripheral wall part 22 is the peripheral wall part 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 falls outward with respect to the vertical. The first inclination angle a1 is obtained by measuring the outer circumferential surface of the peripheral wall portion 2, and the second inclination angle a2 is a portion of the inner circumferential surface of the peripheral wall portion 2 that is in contact with the accommodation space 4, where the thick wall portion 8 is not formed. Obtained by measuring. The second angle of inclination a2 is larger than the first angle of inclination a1. That is, the circumferential wall portion 2 gradually expands in diameter while maintaining the first inclination angle a1 from the lowest end to the inclination angle change point 23, but from the inclination angle change point 23 upwards, the diameter expands to a second inclination angle a2. The diameter increases gradually while maintaining the second inclination angle a2.

Due to the shape in which the second circumferential wall portion 22 having a second inclination angle a2 larger than the first inclination angle a1 is continuous on the first circumferential wall portion 21 having a first inclination angle a1, when the containers 100 are placed one on top of the other, the inner and outer containers 100 A gap is created in the area where the second circumferential wall parts 22 face each other, and the second circumferential wall parts 22 of the inner and outer containers 100 extend in parallel while keeping this gap constant. Therefore, when the containers 100 are stacked, the contact surface where the peripheral wall portions 2 of adjacent containers 100 come into contact with each other becomes small, and the containers 100 can be easily peeled off. Note that when the containers 100 are stacked, paying attention to the area where the second peripheral wall portions 22 of the inner and outer containers 100 face each other, the wall thickness of the second peripheral wall portion 22 is uniform.

Here, the outer peripheral surface of the second peripheral wall portion 22 becomes a curved printing area 22a. The curved surface printing area 22a is an area where trademarks of food and drink, trade names of providers or sellers, ingredients of contents, patterns to stimulate demand, and other display items for consumers are printed on the curved surface. Curved surface printing is a decorative printing method in which a straight ink plate of the same color is transferred onto a straight rubber-like plate called a printing blanket, and transferred onto the curved surface printing area 22a while rotating the container. Therefore, if the curved surface printing area 22a extends to the first peripheral wall portion 21, the curved surface printing must be divided into two parts, which is complicated and may cause printing misalignment. Therefore, the curved surface printing area 22a is secured in the second peripheral wall part 22 and does not extend to the first peripheral wall part 21.

In order to make the curved surface printing area 22a as wide as possible, in other words, to ensure that the second peripheral wall portion 22 has a large area, the inclination angle change point 23 is provided halfway down the hill 6. Furthermore, in curved surface printing, depending on the material to be printed, it is necessary to roughen the container surface by corona discharge to improve printability. For corona discharge, it is necessary to insert a jig into the inner surface of the container, and a certain distance from the elevated platform 6 is required. Therefore, it is desirable that the position of the inclination angle change point 23 of the second peripheral wall portion 22 that joins to the elevated platform 6 is set lower than the position where it joins to the bottom portion 1.

Therefore, the first peripheral wall part 21 rises from the lowest end of the high ground 6, and the second peripheral wall part 22 rises from the middle of the high ground 6 as the peripheral wall part 2 changes to the second inclination angle a2. In this case, all the peripheral wall parts 2 in contact with the accommodation space 4 belong to the second peripheral wall part 22, and when the containers 100 are stacked, the first peripheral wall part 21 and the outer container 100 are separated from the bottom end of the inner container 100. The area where the second peripheral wall portion 22 faces begins. The area from the upper end of the second peripheral wall portion 22 to the mouth rim 31 is expanded in diameter to reinforce the strength of the mouth rim 31 and to prevent the retainer from rattling. The stepped portion 24 may be formed by expanding the diameter.

The outer recess 71 and the inner protrusion 72 have corresponding shapes that allow them to fit together. The outer surface concave portion 71 is formed on the outer surface of the first peripheral wall portion 21, and is formed by recessing the outer surface of the elevated platform 6. This outer surface recess 71 extends over the entire circumference at the same height and has an annular shape. The outer surface recess 71 has a gently sloped part 71a and a steeply sloped part 71b, and is recessed from the bottom to the top at a gentle angle so as to gradually become deeper, and when it reaches a certain height, the recess suddenly disappears. . The gently sloped portion 71a is a portion that is recessed from the bottom to the top at a gentle angle so as to gradually become deeper, and the steeply sloped portion 71b is a portion where the recess suddenly disappears.

On the other hand, the inner surface protrusion 72 is formed on the inner surface of the second peripheral wall section 22 and is formed by protruding the inner surface of the body section 5 . The inner surface protrusion 72 has an annular shape and extends all the way around at the same height. The inner surface protrusion 72 is installed so that when another container 100 of the same shape and size is inserted into the storage space 4 and the toe 61 lands on the bottom surface 1, it fits into the outer surface recess 71 without a gap. The height, installation range, and amount of protrusion are adjusted, and the shape of the protrusion matches the recess space of the outer surface recess 71. That is, the inner protrusion 72 has a gently sloped part 72a and a steeply sloped part 72b, and gradually swells from the bottom to the top at a gentle angle, but when it reaches a certain height, it swells suddenly. Eliminate. The gently sloped portion 72a is a portion that gradually swells from the bottom to the top at a gentle angle, and the steeply sloped portion 72b is a portion where the bulge disappears suddenly.

For example, the outer surface recess 71 has a lower end at a height H1 from the lowest end of the container 100, and extends to a height H2 from the lower end of the recess. It is assumed that the deepest part of the outer surface recess 71 occurs at a height H3 with respect to the lower end of the recess, and has a depth D1 with respect to the outer peripheral surface of the first peripheral wall portion 21. Also, consider a virtual line VL that starts from the inner bottom surface of the bottom surface 1 of the container 100 that is in contact with the accommodation space 4 and extends straight from the inner peripheral surface of the peripheral wall portion 2 that extends to the lower end of the inner surface protrusion 72 . At this time, the lower ends of the outer recesses 71 of the inner containers 100 that are vertically adjacent to each other in the stacked state are separated from the virtual line VL of the outer container 100 by a distance D2 along the radial direction of the containers 100, and In terms of height, it is assumed that the distance D3 is further away from the zero depth point.

At this time, the inner protrusion 72 starts to bulge slightly below the height H1 from the inner bottom surface of the bottom surface 1 that is in contact with the accommodation space 4, and at the position of the height H1 from the inner bottom surface of the bottom surface 1, It bulges out by a distance D2 from the inner peripheral surface of No.2. The inner protrusion 72 has a height bulged by a distance D2 as a reference, and the inner protrusion 72 bulges out the most at a height H3 from this reference. The length is the sum of the distance D3 at this point. The angle of inclination of the gently sloped portion 72a of the inner surface protrusion 72 is the same as the angle of inclination of the gently sloped portion 71a of the outer surface recess 71. The portion where the concavity of the outer surface recess 71 is rapidly eliminated and the portion where the bulge of the inner surface protrusion 72 is rapidly eliminated both have an arc shape, and the radius of the arc is the same.

Note that the outer peripheral surface of the toe 61 of the elevated platform 6 is shaved thinly before reaching the outer recess 71 to form a thin wall portion 73 . As a result, the platform 6 of the inner container 100 climbs over the inner surface protrusion 72, and the inner surface protrusion 72 and the outer surface recess 71 are easily fitted together.

Next, the thick wall portion 8 is a region of the second peripheral wall portion 22 where the wall is thicker than the wall above the thick wall 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 at a height H4 from the lowest end of the container 100. At this time, the thick portion 8 extends up to a height H4 based on the inner surface of the bottom portion 1 that is in contact with the accommodation space 4, with the upper end of the inner surface protrusion 72 as the base end. Note that the entire outer circumferential surface of the second circumferential wall portion 22 is flat.

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

The thick portion 8 has a thickness such that the gap S2 is made as narrow as possible to a constant gap S3 within the range in which the thick portion 8 extends. That is, the thickness T1 of the thick portion 8 is set so that T1=[S1+H5×(tan(a2)−tan(a1))]−S3 at a height H5 based on the upper end position of the inner surface protrusion 72. is set to . If the wall thickness of the second peripheral wall 22 at a location where the thick part 8 is not present is T2 in the radial direction of the container, then the distance from the outer peripheral surface to the inner peripheral surface of the second peripheral wall 22 at the point of the thick part 8 is T2. The wall thickness T3, measured along the radial direction of the container, is T3=T2+T1.

In addition, the outer circumferential surface of the elevated platform 6 is bent in the middle due to the presence of the inclination angle changing point 23, but the inner circumferential surface of the elevated platform 6 rises at the same inclination angle. On the other hand, the inner circumferential surface of the elevated platform 6 is inclined so as to enter the inside of the container 100 from the toe 61 to the base in contact with the bottom part 1. That is, the base of the platform 6 is formed thick due to the presence of the inclination angle change point 23 and the inner circumferential surface is inclined inward, and the foot end 61 of the platform 6 is thin. It is tapered so that it becomes.

Therefore, the inner circumferential diameter of the base of the platform 6 is smaller than the inner circumferential diameter of the toe. Due to this shape relationship, when another container 100 is inserted and the sole of the platform 6 lands on the bottom surface 1, the other container 100 will be supported on the platform 6. Therefore, even if pressure is applied from above and below the stack, damage to the container 100 such as cracking of the bottom part 1 is less likely to occur.

(effect)
FIG. 4 shows a state in which the containers 100 are stacked. The inner container 100 is put into the outer container 100 through the opening 3 of the outer container 100 and stacked. The inner container 100 is stacked on top of the outer container 100 from the elevated platform 6 side.

The toe 61 of the peripheral wall portion 2 is a thin wall 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 2 passes through the thick part 8, the toe 61 of the peripheral wall 2 does not slide along the thick part 8. Therefore, the presence of the thick wall portion 8 also allows the inner container 100 to be easily inserted into the outer container 100.

Further, as the insertion of the container 100 progresses, the space defined by the bottom portion 1 of the outer container 100, the thick wall portion 8 of the outer container 100, and the elevated platform 6 of the inner container 100 increases in volume. We will reduce it. At this time, a gap is secured between the toe 61 of the peripheral wall 2 and the thick wall portion 8 by the thin wall portion 73 and the outer surface recess 71, and the existence of the thick wall portion 8 may also cause so-called air tightness. There isn't. Air tight refers to a condition in which air cannot escape from a reduced volume space.

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

Furthermore, when the toe 61 climbs over the inner protrusion 72, the outer recess 71 has a gently sloped portion 71a that gradually deepens from the bottom to the top. As a result, the inner container 100 is guided to slide toward the bottom of the outer container 100.

The outer recess 71 and the inner protrusion 72 both have gently inclined parts 71a, 72a and steeply inclined parts 71b, 72b of the same shape. Therefore, when the toe 61 of the inner container 100 lands on the bottom surface 1 of the outer container 100, the inner surface protrusion 72 of the outer container 100 fits into the outer surface recess 71 of the inner container 100. This creates a blocking force during stacking.

When stacked, the steeply sloped parts 71b and 72b of the outer recess 71 and the inner protrusion 72 are in contact with each other. It is assumed that during this stacking, a downward force is applied to the inner container 100 so that the inner container 100 attempts to advance beyond the bottom surface 1 of the outer container 100. The steeply sloped portions 71b and 72b of the outer surface recess 71 and the inner surface protrusion 72 have a stepped shape in which the depression rapidly disappears, and a step shape in which the depression rapidly collapses. Therefore, when a downward force is applied, the steeply sloped parts 71b and 72b of the outer surface recess 71 and the inner surface protrusion 72 first collide with each other and receive the downward force. Therefore, the downward pressure exerted by the toe 61 of the inner container 100 on the bottom surface 1 of the outer container 100 is weakened. Therefore, the risk of damaging the bottom portion 1 of the outer container 100 during stacking is suppressed.

Furthermore, when stacked, the second circumferential wall 22 of the outer container 100 faces the first circumferential wall 21 of the inner container 100. In this facing area, the gap between the inner container 100 and the outer container 100 is filled in the height range where the outer surface recess 71 and the inner surface protrusion 72 fit into each other. That is, in the range where the outer recess 71 and the inner protrusion 72 fit together, there is no room for the inner container 100 to tilt relative to the outer container 100. Therefore, the inner and outer containers 100 can easily stand vertically without bowing.

Further, a thick wall portion 8 is formed in the second peripheral wall portion 22 of the outer container 100 that faces the first peripheral wall portion 21 of the inner container 100. In the region where the first circumferential wall portion 21 and the second circumferential wall portion 22 face each other, if there is no thick wall portion 8, the gap will become larger toward the top. However, the thick part 8 narrows the gap between the first peripheral wall part 21 and the second peripheral wall part 22 and keeps it 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 vertically.

In this way, below the inner container 100, the outer surface recess 71, the inner surface protrusion 72, and the thick wall 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 relative to the outer container 100, making it easier for the stack to become vertical. Note that the outer surface recess 71, the inner surface protrusion 72, and the thick wall portion 8 are set as far down as possible in the container 100. This is because the degree to which the container 100 can be tilted is smaller when it is set below the container 100 than when it is set above the container 100.

Next, when the inner container 100 is peeled off from the stack, a certain gap is maintained where the second peripheral wall portions 22 of the inner and outer containers 100 face each other, so the contact area between the inner and outer containers 100 is reduced. , the inner container 100 becomes easier to peel off from the stack. Furthermore, since the outer surface recess 71 has a gently sloped part 71a that gradually becomes shallower from the deepest part downward, the toe 61 of the inner container 100 is bent little by little, and even a small peeling force can exert a blocking force. Can be canceled.

(effect)
As described above, the peripheral wall portion 2 of this container 100 has the first peripheral wall portion 21 and the second peripheral wall portion 22, and the second peripheral wall portion 22 has the thick portion 8. The first peripheral wall part 21 extends from the lowest end of the peripheral wall part 2 to a height halfway up the platform 6, and the second peripheral wall part 22 is located following the first peripheral wall part 21 in the direction of the opening 3. It is tilted to the outside of the container 100 with respect to 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 when stacked.

In this way, by setting the first peripheral wall part 21 and the second peripheral wall part 22 in the peripheral wall part 2, it becomes easier to peel off the container 100 from the stack. Furthermore, by setting the inclination angle change point 23 in the middle of the elevated platform 6, the second peripheral wall portion 22, which becomes the curved surface printing area 22a, can be made wider. In this case, when stacked, the first circumferential wall 21 of the inner container 100 and the second circumferential wall 22 of the outer container 100 face each other, creating a wide gap, starting from the lowest end of the inner container 100. It will happen. However, due to the thick portion 8, a constant gap is maintained in the area where the first peripheral wall part 21 and the second peripheral wall part 22 face each other when stacked. Therefore, there is less room for the inner container 100 to lean against the outer container 100, making it difficult for the stack to bend in an arched shape. That is, it becomes easier for the stack to stand vertically.

In order to make it easier for the stack to stand upright vertically, it is also conceivable to extend the first peripheral wall portion 21 in the height direction beyond the platform 6 until it fully 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 will be caught at the position of the inclination angle change point 23 of the outer container 100. That is, the inclination to the extent that the gap between the first peripheral wall portions 21 is filled becomes maximum. Therefore, even without the thick wall portion 8, the angle at which the inner container 100 collapses into the outer container 100 becomes smaller, making it difficult for the stack to bend into an arched shape.

However, if the first peripheral wall part 21 extends until it fully enters the body part 5, the area of the second peripheral wall part 22 becomes small, and a curved surface printing area 22a of a satisfactory size cannot be obtained. Therefore, it is desirable that the first peripheral wall portion 21 has a height halfway up the height of the platform 6, and in this case, the presence of the thick wall portion 8 becomes useful for vertically standing the stack.

Of course, even if the first peripheral wall parts 21 face each other, if the facing area is not sufficient, it is not possible to sufficiently prevent the inner container 100 from falling down. In this case, even if the first peripheral wall portion 21 extends into the body portion 5, the presence of the thick wall portion 8 is useful for vertically standing the stack. Specifically, when the height of the first peripheral wall part 21 exceeds the inner bottom surface of the bottom part 1 and falls within a range of less than half of the height dimension of the first peripheral wall part 21, the height of the first peripheral wall part 21 It is not possible to sufficiently prevent the inner container 100 from falling down due to the areas where the containers face each other. Therefore, the thick portion 8 becomes useful.

That is, the first peripheral wall part 21 extends from the lowest end of the peripheral wall part 2 toward the opening 3 beyond the height 6 to a predetermined height, and the second peripheral wall part 22 extends from the lowermost end of the peripheral wall part 2 toward the opening 3 to a predetermined height, and the second peripheral wall part 22 extends between the vertically adjacent inner containers when stacked. Even if the thick wall portion 8 is provided in a position facing the first peripheral wall portion 21 of the stack 100, which bulges toward the accommodation space 4, the stack can easily stand vertically.

The thick portion 8 has a length equal to or less than the range in which the first circumferential wall portion 21 of the vertically adjacent inner container 100 and the second circumferential wall portion 22 of the outer container 100 face each other during stacking. What is necessary is just to make it extend in the height direction. The length in the height direction from the starting end to the terminal end of the thick portion 8 may be at least 30% of the height H4 of the first peripheral wall portion 21. If a certain narrow gap or 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 vertically.

When the inner protrusion 72 and the outer recess 71 extend in the height direction over 10% or more of the height H4 of the first peripheral wall 21, the inner protrusion 72 also engages with the outer recess 71. It functions as a part of the thick portion 8 that further bulges out. Therefore, the range of 10% or more of the height H4 of the first peripheral wall 21 regarding the thick portion 8 can be based on the lowest end of the inner surface protrusion 72 that contacts the outer surface recess 71.

Further, the object to be engaged with the inner surface protrusion 72 is the outer surface recess 71, and the outer surface recess 71 is formed by recessing the outer peripheral surface of the peripheral wall portion 2. Thereby, when stacking the containers 100, it is possible to prevent the object to be engaged with the inner surface protrusion 72 from sliding on the thick wall portion 8, making it difficult to stack the containers 100. In addition, since the inner surface protrusion 72 and the outer surface recess 71 also function as part of the thick wall portion 8, it is possible to further suppress the stacked containers 100 from bending in an arched shape.

The inner surface protrusions 71 may be formed in an annular shape extending all around the circumference at the same height, or may be formed in a plurality in the form of intermittent short lines at the same height. Therefore, the outer surface recesses 72 may be formed in an annular shape extending all around the circumference at the same height, or may be formed in a plurality in the form of intermittent short lines at the same height.

Moreover, the second peripheral wall part 22 only needs to be wider than the first peripheral wall part 21, and the first inclination angle a1 may be a negative value, that is, it may be tilted toward the inside of the container 100. However, from the viewpoint of mold 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 angle.

Further, the second peripheral wall portion 22 may be formed all the way to the mouth edge 31, or peripheral walls having different inclination angles may be stacked on the second peripheral wall portion 22.

1 Bottom part 2 Peripheral wall part 21 First peripheral wall part 22 Second peripheral wall part 22a Curved surface printing area 23 Inclination angle change point 3 Opening 31 Edge 4 Accommodation space 5 Body part 6 Plateau 61 Toe 71 External recessed part 71a Slightly sloped part 71b Steep Oblique portion 72 Inner protrusion 72a Slightly oblique portion 72b Steep oblique portion 73 Thin wall portion 8 Thick wall portion 100 Container

Claims (4)

A container with a top opening and a bottom,
a bottom part forming the bottom of the accommodation space;
a peripheral wall portion forming a side surface of the storage space and continuing endlessly along the edge of the bottom surface portion;
Equipped with
The peripheral wall portion is
a first peripheral wall portion extending from the lowest end of the peripheral wall portion toward the opening to a predetermined height;
a second peripheral wall portion that is located following the first peripheral wall portion in the direction of the opening and that falls outward from the first peripheral wall portion;
has
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 vertically adjacent inner containers when stacked,
The thick portion extends over a length equal to or less than the range in which the first circumferential wall portion of the vertically adjacent inner container and the second circumferential wall portion of the outer container face each other during stacking. extends in the height direction,
The peripheral wall portion has a high base extending below the bottom portion,
The first peripheral wall portion extends to a midway height of the elevated platform,
The second peripheral wall portion extends from a midway height of the hill toward the top opening;
A container featuring: an inner surface protrusion protruding from the inner peripheral surface of the peripheral wall toward the accommodation space;
an outer surface recess formed by recessing the outer peripheral surface of the peripheral wall portion to a size that allows engagement with the inner surface protrusion;
Equipped with
The inner surface protrusion and the outer surface recess are provided at positions facing each other at the same height as the outer surface recess of the vertically adjacent inner container and the inner surface projection of the outer container when stacked;
The container according to claim 1, characterized in that: The thick portion extends in the height direction starting from the upper end of the inner protrusion;
The container according to claim 2, characterized in that: The thick portion narrows a gap between the first peripheral wall portions of vertically adjacent inner containers when stacked;
The container according to any one of claims 1 to 3, characterized by:

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