TW202411127A - Resin made container - Google Patents

Abstract

A resin container comprising a mouth portion 2, a shoulder portion 3, a barrel portion 4, and a bottom portion 5, the barrel portion 4 having a substantially square tubular shape, and the shoulder portion 3 having a shape continuously connecting the mouth portion 2 and the barrel portion 4, wherein the barrel portion 4 has, at least in a part thereof, a specific portion 42 with a shape such that, when two sets of opposite sides in a cross section of the barrel portion 4 are extended, a parallelogram of which the interior angles are not right angles is formed, and the shoulder portion 3 has an arched convex rib 31 extending between two of the vertex portions of the shoulder portion 3 in a plan view that are directly over the acute angles of the parallelogram of the specific portion.

Description

Resin container

The present invention relates to a resin container.

Resin containers are widely used as containers for filling liquid products such as drinks for circulation or sale. Resin containers have the advantages of being lighter than other containers, easy to make into any shape according to the requirements of capacity or design, and easy to confirm the contents if they are transparent, so they are used for a wide range of purposes.

When storing or transporting used resin containers for recycling or disposal, their large size may become a problem. For example, empty bottles and paper containers can be easily flattened after use. However, resin containers are difficult to flatten due to the elasticity of the resin.

Regarding this problem, for example, Japanese Patent Publication No. 2008-201448 (Patent Document 1) discloses a synthetic resin container having a unique transverse groove formed by partially bulging the side wall surface. Also, Japanese Patent Publication No. 2008-56291 (Patent Document 2) discloses a container having longitudinal ribs and transverse ribs that serve as the starting point for folding operation. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Publication No. 2008-201448 [Patent Document 2] Japanese Patent Publication No. 2008-56291

[The problem the invention is trying to solve]

However, the technology of Patent Document 1 is limited to easily flattening the container, and does not consider folding the flattened container. In addition, the technology of Patent Document 2 considers folding the shoulder and bottom of the container, but does not consider folding the body that occupies the largest volume. Therefore, the prior art has room for improvement in terms of suppressing the size of the container after use.

Therefore, a resin container whose body can be easily flattened and folded is sought. [Technical means to solve the problem]

The first resin container of the present invention comprises a mouth, a shoulder, a trunk, and a bottom, wherein the trunk is roughly square-tube-shaped, the shoulder has a shape that continuously connects the mouth and the trunk, at least a portion of the trunk is provided with a specific portion, the specific portion has a shape of a parallelogram whose internal angles are not right angles when two groups of facing sides in the cross section of the trunk are extended, the shoulder has an arc-shaped convex rib extending between two vertex portions, the two vertices are located in the vertex portion in a plan view, and the specific portion is directly above the vertex of the sharp angle of the parallelogram.

According to this structure, the cross section of the specific part is roughly a parallelogram, so by applying force in a manner that closes the vertices of the sharp corners of the parallelogram, the specific part can be flattened more easily and more flatly than the previous container with a rectangular cross section. In addition, the specific part becomes flat, which makes it easy to fold the container in the vertical direction with the specific part as the starting point. In addition, when the shoulder is deformed in a manner that enters the inner side of the container, the arc-shaped convex rib becomes the starting point of the deformation by convex folding, so it is easy to operate. Therefore, by folding the resin container in half at the body and making the bottom protrude into the shoulder, the shoulder can be easily flattened. In this way, according to the present invention, a resin container whose body is easy to flatten and easy to fold can be realized.

The first resin container of the present invention, as one aspect, is preferably: at least one convex rib is respectively provided in two regions of the shoulder portion divided into two by a diagonal line connecting the two apex portions facing each other in a plan view.

According to this structure, the operation direction when the body is folded in half is not limited.

The first resin container of the present invention, as one aspect, preferably further comprises a concave rib along the boundary between the shoulder and the body.

According to this structure, the concave rib acts as a shoulder fold, so it is easy to flatten the shoulder.

The first resin container of the present invention is preferably configured such that when the shoulder is bent along the rib and the body is bent, an eave-shaped protrusion is formed in the area between the mouth and the rib, so that the bottom and the protrusion are engaged with each other.

According to this structure, the bottom and the shoulder can be engaged, so the folded state of the resin container can be easily fixed.

The first resin container of the present invention, as one aspect, is preferably provided with a pair of marks at the apex portion of the end portion of the shoulder portion where the rib is not provided, and at the apex portion of the bottom portion located directly below the apex portion.

According to this structure, the order of folding operations can be shown to consumers and the like.

The first resin container of the present invention is preferably, as one aspect, that the body is sequentially divided into an upper portion, the specific portion, and a lower portion from the side connected to the shoulder toward the side connected to the bottom.

According to this aspect, the specific portion is located at the upper and lower centers of the body, so it is easier to fold the container in half.

The first resin container of the present invention, as one aspect, is preferably: the aforementioned body has a lower side portion as a portion between the aforementioned specific portion and the aforementioned bottom, and is provided with a rib extending along the boundary of the two faces connected in the aforementioned lower side portion, corresponding to the boundary of the vertices of the sharp angle of the aforementioned parallelogram in the aforementioned specific portion.

According to this structure, when the lower side portion is pressed, the rib functions as a fold, so that the lower side portion is easily pressed.

The first resin container of the present invention, as one aspect, is preferably provided with ribs extending along the boundaries of the two faces in the aforementioned specific portion, corresponding to the vertices of the sharp angles of the aforementioned parallelogram.

According to this structure, when the specific portion is pressed down, the rib functions as a fold, so that the specific portion can be easily pressed down.

The first resin container of the present invention, as one aspect, is preferably such that the cross section of the body can distinguish a long side and a short side.

According to this structure, compared with the case where a container of the same capacity is realized in other shapes, a container that is easier to hold can be provided.

The second resin container of the present invention is a resin container having a mouth, a shoulder, a body, and a bottom, wherein the body is roughly in the shape of a prism, and at least a portion of the body is provided with a specific portion, which has a shape of a parallelogram whose internal angles are not right angles when two groups of facing sides in the cross-section of the body are extended.

According to this structure, the cross section of the specific part is a substantially parallelogram, so by applying force in a manner that closes the vertices of the sharp angles of the parallelogram, the specific part can be flattened more easily and more flatly than a conventional container having a rectangular cross section. In addition, the specific part becomes flat, thereby making it easy to fold the container in the vertical direction with the specific part as the starting point. In this way, according to the present invention, a resin container can be realized that is easy to flatten the body of the container and easy to fold.

The second resin container of the present invention is preferably, as one aspect, that the body is sequentially divided into an upper portion, the specific portion, and a lower portion from the side connected to the shoulder toward the side connected to the bottom.

According to this aspect, the specific portion is located at the upper and lower centers of the body, so it is easier to fold the container in half.

The second resin container of the present invention, as one aspect, is preferably such that the aforementioned specific portion is more recessed inwardly than the aforementioned upper portion and the aforementioned lower portion.

According to this configuration, the specific portion serves as an appropriate holding position for the user when holding the container.

The second resin container of the present invention, as one aspect, preferably has a recessed portion that is further recessed inward from the aforementioned specific portion.

According to this structure, when the user holds the container, he or she hooks his or her fingers on the recessed portion, thereby making it easier for the user to hold the container stably.

The second resin container of the present invention, as one aspect, is preferably configured such that the aforementioned specific portion is provided with transverse ribs extending in the circumferential direction.

According to this structure, it is easy to take into account both the strength of the container during use and the ease of folding the container after use, with respect to a specific portion.

The second resin container of the present invention, as one aspect, is preferably configured such that a plurality of the transverse ribs are provided in parallel on a pair of opposing surfaces of the specific portion.

According to this structure, it is easy to further improve the strength of the surface on which a plurality of transverse ribs are provided in parallel.

The second resin container of the present invention, as one aspect, is preferably: the aforementioned body has a lower side portion as a portion between the aforementioned specific portion and the aforementioned bottom, and is provided with a rib extending along the boundary of the two faces connected in the aforementioned lower side portion, corresponding to the boundary of the vertices of the sharp angle of the aforementioned parallelogram in the aforementioned specific portion.

According to this structure, when the lower side portion is pressed down, the rib functions as a fold, so that the lower side portion can be easily pressed down.

The second resin container of the present invention, as one aspect, is preferably: the aforementioned body has an upper side portion as a portion between the aforementioned specific portion and the aforementioned shoulder, and is provided with a rib extending along the boundary between the aforementioned shoulder and the aforementioned upper side portion.

According to this structure, when the upper part is pressed down, the rib functions as a fold, so that the upper part can be easily pressed down.

The second resin container of the present invention, as one aspect, is preferably provided with ribs extending along the boundaries of the two faces in the aforementioned specific portion, corresponding to the vertices of the sharp angles of the aforementioned parallelogram.

According to this structure, when the specific portion is pressed down, the rib functions as a fold, so that the specific portion can be easily pressed down.

The second resin container of the present invention, as one aspect, is preferably such that the cross section of the body can distinguish the long side and the short side.

According to this structure, compared with the case where a container of the same capacity is realized in other shapes, a container that is easier to hold can be provided.

The third resin container of the present invention comprises a mouth, a shoulder, a body, and a bottom, wherein the body is roughly a square tube, the shoulder has a shape that continuously connects the mouth and the body, and the shoulder has an arc-shaped convex rib extending between two vertex portions facing each other in a plan view.

Furthermore, when the shoulder is deformed so as to enter the inner side of the container, the arcuate rib becomes the starting point of the deformation by convex folding, so the operation is easy. Therefore, by folding the resin container in half at the body and making the bottom protrude into the shoulder, the shoulder can be easily flattened and the resin container can be easily folded.

The third resin container of the present invention, as one aspect, is preferably: at least one convex rib is respectively provided in two areas of the shoulder divided into two by a diagonal line connecting the two apex portions facing each other in a plan view.

According to this structure, the operation direction when the body is folded in half is not limited.

The third resin container of the present invention, as one aspect, is preferably configured such that the ribs extend continuously between the two apex portions.

According to this configuration, the convex rib is formed as a continuous rib, thereby easily playing the role of a starting point for deformation of the shoulder.

The third resin container of the present invention, as one aspect, preferably further comprises a concave rib along the boundary between the shoulder and the body.

According to this structure, the concave rib acts as a shoulder fold, so it is easy to flatten the shoulder.

The third resin container of the present invention is preferably configured such that when the shoulder is bent along the rib and the body is bent, an eave-shaped protrusion is formed in the area between the mouth and the rib, so that the bottom and the protrusion are engaged with each other.

According to this structure, the bottom and the shoulder can be engaged, so the folded state of the resin container can be easily fixed.

The third resin container of the present invention, as one aspect, is preferably provided with a pair of marks at the apex portion of the end portion of the shoulder portion where the convex rib is not arranged, and at the apex portion of the bottom portion located directly below the apex portion.

According to this structure, the order of folding operations can be shown to consumers and the like.

The fourth resin container of the present invention comprises a mouth, a shoulder, a body, and a bottom, wherein the body has ribs extending in the up-down direction at two positions symmetrical to a plane including a central axis connecting the center of the mouth and the center of the bottom.

According to this structure, when the resin container is folded, the convex ribs function as folds, so that the body is easier to fold than conventional resin containers.

The fourth resin container of the present invention, as one aspect, is preferably configured such that the rib is substantially parallel to the central axis.

According to this structure, the resin container folded with the ribs as folds can be easily flattened, which is more advantageous in that the container after use can be reduced in size.

The fourth resin container of the present invention, as one aspect, is preferably: the aforementioned body further has a concave rib extending in the circumferential direction of the aforementioned body, and the aforementioned convex rib spans across the aforementioned concave rib.

According to this structure, the resin container can take into account both the improvement of strength by providing the concave ribs extending in the circumferential direction and the ease of folding by using the convex ribs as folds.

The fourth resin container of the present invention, as one aspect, is preferably: the aforementioned body is substantially rectangular tube-shaped, and the aforementioned ribs are arranged along the edges of the aforementioned body.

When folding an angled tube-shaped object, the operation is performed along the edge, which is easy for the user to understand. According to the above structure, the rib that functions as a fold is provided at a position suitable for this easy-to-understand operation, so the user can easily understand the folding operation.

Further features and advantages of the present invention will become more apparent from the following description of illustrative and non-limiting embodiments with reference to the accompanying drawings.

1. First Implementation Method

A first embodiment of the resin container of the present invention is described with reference to the drawings. Hereinafter, an example in which the resin container of the present invention is applied to a plastic bottle 1 (hereinafter referred to as bottle 1) is described.

[Overall structure of the bottle] The bottle 1 of this embodiment is made of polyethylene terephthalate and is a colorless and transparent container. The bottle 1 is obtained by biaxial stretching blow molding using a preform made of polyethylene terephthalate as a raw material. In addition, the material constituting the bottle is not limited to polyethylene terephthalate, for example, polyethylene or polypropylene can also be used. In addition, the source of the material can be raw materials derived from petroleum, plants, recycled raw materials, etc.

In this embodiment, the capacity of the bottle 1 is set to 2 L. However, the capacity of the bottle 1 is not particularly limited, and the capacity of the bottle 1 may be 200 mL to 2 L, such as 280 mL, 350 mL, 500 mL, etc., which are generally circulated.

The bottle 1 is used for filling liquid products such as soft drinks (carbonated drinks, fruit drinks, coffee drinks, tea drinks, mineral water, soy milk, vegetable drinks, sports drinks, cocoa drinks, etc.), alcoholic drinks, milk drinks, etc.; liquid foods such as soups; liquid seasonings such as soy sauce or soy sauce, etc.

The bottle 1 of this embodiment has a mouth 2, a shoulder 3, a body 4, and a bottom 5 (FIG. 1 and FIG. 2). In the following description, when the up-down direction of the bottle 1 is mentioned, it means the up-down direction based on the posture of the bottle 1 being set in a manner that the bottom 5 is grounded (the posture shown in FIG. 1 and FIG. 2). That is, the upper side of the bottle 1 is the side of the mouth 2, and the lower side of the bottle 1 is the side of the bottom 5. And, when the transverse direction (or horizontal direction) of the bottle 1 is mentioned, it means the direction perpendicular to the above-mentioned up-down direction (that is, the left-right direction of FIG. 1 or the direction perpendicular to the paper surface). In addition, a pair of facing surfaces of the bottle 1 have the same shape.

The bottle 1 is roughly quadrilateral in plan view (FIG. 3). In addition, roughly quadrilateral is not limited to the shape of a quadrilateral according to the mathematical definition, which means that a substantially quadrilateral shape having rounded corners that can be provided as an industrial product is also possible. More specifically, the quadrilateral is a rectangle, and the side of the bottle 1 can be distinguished into the long side surface (FIG. 1) and the short side surface (FIG. 2) of the cross section.

The mouth 2 is an opening for the liquid product filled therein to enter and exit, and its outer surface is provided with a male threaded portion for screwing a bottle cap (not shown). The shoulder 3 is a portion of the bottle 1 that gradually expands from the mouth 2 toward the body 4. In addition, the position in the direction of the height in which the bottle 1 gradually expands from the mouth 2 toward the bottom is defined as the boundary between the shoulder 3 and the body 4. The bottom 5 is a portion that serves as a contact surface when the bottle 1 is placed on a surface such as a table, and the bottle 1 also gradually expands from the bottom 5 toward the body 4. In addition, the position in the direction of the height in which the bottle 1 gradually expands from the contact surface toward the top is defined as the boundary between the bottom 5 and the body 4. The structure and function of the mouth 2 and the bottom 5 are substantially the same as those of the mouth and the bottom of a known plastic bottle, so a detailed description thereof is omitted.

[Structure of the shoulder] The shoulder 3 has a shape that continuously connects the mouth 2 and the body 4. The mouth 2 is a shape in which a male thread is provided on the outer surface of a roughly cylindrical body, and the body 4 is a roughly square column shape, so the cross-section of the shoulder 3 at the upper end is roughly circular, and the cross-section at the lower end is roughly square. In the plan view (Figure 3), the shape of the shoulder 3 is shown as a roughly square shape at the lower end.

The shoulder 3 is provided with two arc-shaped ribs 31. Each rib 31 extends continuously between two apex portions A and A facing each other in a plan view. In addition, two regions of the shoulder 3 divided by a diagonal line L1 connecting the two apex portions A and A are each provided with a rib 31. In addition, a "rib" refers to a rib protruding from the surface of the bottle 1.

The rib 31 extends obliquely upward at an angle of about 45° from the end of the vertex portion A in the side view (FIG. 2). The height direction position of the rib 31 is the largest near the diagonal line L2 connecting the vertex portions B, B different from the vertex portions A, A.

By providing the rib 31 on the shoulder 3, the shoulder 3 can be easily folded along the rib 31. More specifically, the shoulder 3 can be bent in a partially convex folded state along the rib 31, and at this time, the shoulder lower portion 32, which is the area between the body 4 and the rib 31, can enter under the shoulder upper portion 33, which is the area between the mouth 2 and the rib 31. By deforming the shoulder 3 in this way, the shoulder upper portion 33 becomes a protruding portion in the shape of an eave, and achieves the function of engaging with the bottom 5 when the body 4 is bent (to be described later).

The top points B and B of the shoulder 3 (top points of the end where the rib 31 is not provided) are provided with a numbered mark 34 (an example of a mark) (FIG. 1 to FIG. 3). Similarly, the bottom 5 is provided with a numbered mark 51 (an example of a mark) (FIG. 1 and FIG. 2). The position of the bottom 5 where the mark 51 is provided corresponds to the top point directly below the top points B and B of the shoulder 3. In addition, the mark 51 is located directly below the mark 34, which means that the mark 51 is located in a positional relationship from the mark 34 along the surface of the bottle 1 to the bottom (the bottom direction of the paper in FIG. 1 and FIG. 2). That is, the arrangement on the bottle 1 only requires that the mark 51 is "directly below" the mark 34, and the mark 34 and the mark 51 do not need to be strictly on the same vertical line. In the following description, when the vertical positional relationship between the constituent elements is expressed as "directly above" or "directly below", it also refers to the vertical positional relationship in the configuration on the bottle 1, and it is not necessary for them to exist strictly on the same vertical line.

[Construction of the trunk] The trunk 4 is divided into an upper portion 41, a specific portion 42, and a lower portion 43 in order from the side connected to the shoulder 3 (upper side) toward the side connected to the bottom 5 (lower side). The trunk 4 has concavities and convexities in the front view and the side view due to the difference in horizontal dimensions of the upper portion 41, the specific portion 42, and the lower portion 43 and the presence of a plurality of ribs (to be described later), but it is regarded as a roughly square tube shape as a feature of operation during manufacturing or circulation. That is, the roughly square tube shape described for the trunk 4 does not need to be a square tube shape in the mathematical sense.

(1) Upper side portion 41 The upper side portion 41 is a portion of the body 4 that is higher than the specific portion 42, that is, a portion between the specific portion 42 and the shoulder 3. The upper side portion 41 is provided with a first transverse rib 61 (an example of a concave rib) along the boundary between the shoulder 3 and the upper side portion 41, and a plurality of (five in this embodiment) second transverse ribs 62 (FIG. 1 and FIG. 2). The first transverse rib 61 is a concave rib (a rib that protrudes into the inner side of the bottle 1, the same below) provided on each of the long side surfaces (FIG. 1) and the short side surfaces (FIG. 2) of the cross section (a total of four sides) with a length that is within the range of each surface. The depth of the first transverse rib 61 is uniform. In addition, the depth of the concave rib refers to the depth of the rib protruding into the inner side of the bottle 1, and the same applies to the other concave ribs below.

The second transverse rib 62 is a concave rib provided in the horizontal direction over the entire circumference of the upper side portion 41. The second transverse rib 62 has a wave shape with deep portions and shallow portions alternately provided. More specifically, the deep portion is provided at the portion corresponding to the side of the cross section, and the shallow portion is provided at the portion corresponding to the vertex of the cross section.

In addition, the cross-sectional shape of the upper portion 41 is substantially the same as the plan view of the bottle 1 ( FIG. 3 ).

(2) Specific portion 42 The specific portion 42 is formed as a portion that is more recessed in the inner side of the bottle 1 than the upper portion 41 and the lower portion 43 (Figures 1 and 2). The cross section of the specific portion 42 is shown in Figure 4. It can be determined that the two sets of sides 44 and 45 facing each other in the cross section, one set of sides 44 corresponds to the long side surface (Figure 1), and the other set of sides 45 corresponds to the short side surface (Figure 2). The two sets of facing sides 44 and 45 are extended to form a parallelogram P. The parallelogram P has a vertex P1 with a sharp internal angle and a vertex P2 with a blunt internal angle, so the internal angles of the parallelogram P are not right angles. In other words, the parallelogram P is not a rectangle.

The apex portion A (the end portion provided with the rib 31) and the apex portion B (provided with the mark 34) in the shoulder portion 3 and the apex P1 (sharp corner) and the apex P2 (blunt corner) in the specific portion 42 are in a positional relationship in which the apex portion A is located directly above the apex P1, and the apex portion B is located directly above the apex P2.

The first longitudinal rib 71 is provided along the boundaries of the long side surface (FIG. 1) and the short side surface (FIG. 2) of the specific portion 42. More specifically, the first longitudinal rib 71 is provided at two boundaries corresponding to the vertices P1 of the sharp angles of the parallelogram P among the boundaries of the long side surface and the short side surface. In addition, in the present embodiment, the first longitudinal rib 71 is a convex rib provided in a manner protruding from the outer side of the bottle 1.

The specific part 42 has a concave portion 42b that is further recessed inward from the main part 42a of the specific part 42. The concave portion 42b is provided at the center in the left-right direction of the long side surface (FIG. 1) of the cross section. In addition, a cross-shaped rib 46 is provided at the center of the concave portion 42b. The rib 46 is formed by two orthogonal concave ribs.

The main part 42a of the specific part 42 is provided with a third transverse rib 63 extending in the circumferential direction. More specifically, three third transverse ribs 63 are arranged parallel to each other in the height direction on the left and right sides of the recessed part 42b, and the length of the central rib is slightly longer than the lengths of the upper and lower ribs (Fig. 1, Fig. 2). The third transverse rib 63 is a concave rib, and its depth is uniform. In addition, the first longitudinal rib 71 is provided in a manner spanning these three third transverse ribs 63.

The specific portion 42 serves as an appropriate gripping position for the user when gripping the bottle 1. First, the specific portion 42 is formed as a portion that is more recessed inside the bottle 1 than the upper portion 41 and the lower portion 43, so that a user with a small hand can easily grip the specific portion 42. Second, when the user grips the specific portion 42, the user can hook the concave portion 42b with his fingers, so that the bottle 1 can be gripped stably.

The size of the internal angles of the sharp corners and the vertices of the blunt corners of the parallelogram P is not limited as long as the parallelogram P is a parallelogram. In other words, using an angle θ greater than 0°, the internal angles of the vertices of the sharp corners are expressed as 90°-θ, and the internal angles of the vertices of the blunt corners are expressed as 90°+θ. In the present embodiment, θ is 5°, that is, the internal angle of the vertex P1 is 85°, and the internal angle of the vertex P2 is 95°. As in this example, θ is preferably greater than 1° and less than 30°. The cross-sectional shape of the specific portion 42 is a parallelogram P, which has the effect of facilitating the operation of flattening the specific portion 42 (to be described later), and this effect is particularly easy to appear when θ is greater than 1°. In addition, when θ is less than 30°, the function of the specific portion 42 as a holding position of the bottle 1 is not easily lost. θ is preferably 3° or more, more preferably 4° or more. Also, θ is preferably 10° or less, more preferably 6° or less.

(3) Lower side portion 43 The lower side portion 43 is a portion of the body 4 that is lower than the specific portion 42, that is, a portion between the specific portion 42 and the bottom 5. The lower side portion 43 is provided with a wavy rib 64, a spring rib 65, and a plurality of (two in this embodiment) fourth transverse ribs 66 in order from the top. These ribs are all concave ribs. In addition, a second longitudinal rib 72 is provided that extends along the boundaries of the long side surface (Figure 1) and the short side surface (Figure 2) of the cross section of the lower side portion 43, and is located below the first longitudinal rib 71. The second longitudinal rib 72 is a convex rib provided in a manner that spans the wavy rib 64 and the fourth transverse rib 66. In addition, the cross-sectional shape of the lower portion 43 is substantially the same as the plan view of the bottle 1 (FIG. 3).

The wavy rib 64 is a rib whose position in the vertical direction continuously changes along the circumferential direction of the lower portion 43. The spring rib 65 includes a groove portion 65a provided over the entire circumference of the lower portion 43, and small recesses 65b formed one above and one below the groove portion 65a over the entire circumference of the lower portion 43. In addition, the entire spring rib 65 including the groove portion 65a and the small recesses 65b can also be regarded as one rib.

The fourth transverse rib 66 is arranged horizontally over the entire circumference of the lower portion 43. However, as described above, the second longitudinal rib 72 crosses the fourth transverse rib 66. The depth of the fourth transverse rib 66 is uniform except for the portion where the second longitudinal rib 72 crosses.

[Bottle folding method] The bottle 1 of this embodiment is a container that is easier to fold than conventional plastic bottles by providing the above-mentioned components. By folding the used bottle 1, the volume of the used bottle 1 during storage, transportation, etc. for reuse or disposal can be reduced. The following describes the method of folding the bottle 1.

First, an operation of flattening the specific portion 42 is performed (FIG. 5). Specifically, each of the two faces on the long side of the cross-section is moved differently from each other so as to face the vertex P1 (sharp angle) of the parallelogram P in the cross-section. If this operation is performed, the specific portion 42 is deformed (flattened) in such a way that the internal angle of the vertex P1 of the parallelogram P becomes smaller and the internal angle of the vertex P2 approaches 180°.

In this embodiment, the cross section of the specific part 42 is a parallelogram, so when a force is applied in a manner to close the vertex P1 with a sharp inner angle, it is easy to deform along the force. Therefore, the specific part 42 can be flattened more easily and more evenly than the conventional plastic bottle with a rectangular cross section. In addition, by providing the first longitudinal rib 71 in a state of protruding from the outside of the bottle 1, the mobility of the vertex P1 part that is deformed in a manner that its inner angle becomes smaller is improved. In this way, the fact that the first longitudinal rib 71 functions as a so-called fold also helps to facilitate the above-mentioned deformation.

Second, the bottle 1 is folded at the flattened specific portion 42 (Fig. 6). At this time, the bottom 5 is operated in such a way as to abut against the shoulder 3, and this operation can be achieved by moving the marking 34 of the shoulder 3 and the marking 51 of the bottom 5 together. The marking 34 and the marking 51 are the same circle numbers, which serves to teach the consumer this operation.

After the bottom 5 is brought into contact with the shoulder 3, when the bottom 5 is pressed toward the shoulder 3, the shoulder 3 is folded at the convex rib 31, and the shoulder lower portion 32 enters under the shoulder upper portion 33, and the shoulder upper portion 33 becomes a ridge-shaped protrusion. This protrusion finally engages with the bottom 5 to play the role of fixing the folded state of the bottle 1. In addition, during this operation, the first transverse rib 61 plays the role of a fold, making it easy to flatten the shoulder 3.

Third, the upper part 41, the lower part 43, and the bottom 5 are flattened. When these parts are flattened, the bottom 5 can be engaged with the upper shoulder part 33 (protrusion) to fix the folded state of the bottle 1 (Figure 7). At this time, if the folded mouth part 2 is bent in a lifting manner so that the upper shoulder part 33 covers the bottom 5, it is easy to fix the folded state of the bottle 1. In addition, the second longitudinal rib 72 also functions as a folding line like the first longitudinal rib 71, making it easy to flatten the lower part 43.

In this embodiment, the cross section of the specific portion 42 is set to a parallelogram to make the shape after being flattened flat, so it is easier to bend the specific portion 42 up and down than in the conventional plastic bottle. In addition, the ribs 31 are provided on the shoulder 3 to facilitate the engagement of the bottom 5, so that it is easy to fix the bottle 1 in the folded state. In this way, the bottle 1 is easier to fold than the conventional containers of the same type, thereby reducing the occupied volume during reuse and disposal.

[Other embodiments] Other embodiments of the resin container of the present invention are described. In addition, the structures disclosed in the following embodiments can also be combined with the structures disclosed in other embodiments for application as long as no contradiction occurs.

In one aspect of the present invention, as long as the trunk is provided with a specific part, the number of divisions of the trunk is not limited. For example, the entire trunk may be set as a specific part. Furthermore, the trunk may be divided into two areas including the specific part. That is, the trunk may be divided into an upper part and a specific part, or may be divided into a specific part and a lower part.

In one aspect of the present invention, the structure of the specific portion is not limited as long as it is formed into a parallelogram shape whose internal angles are not right angles when two sets of opposing sides in the cross section of the specific portion are extended.

In one aspect of the present invention, the presence or absence and arrangement of ribs in a specific portion are arbitrary. Therefore, one or both of these ribs may not be provided. Furthermore, ribs other than these ribs may be provided.

In one aspect of the present invention, a shape that is roughly square in plan view and in which the long-side and short-side faces of the cross section cannot be distinguished may be used. In this case, the parallelogram formed by extending two sets of facing sides in the cross section of a specific portion is a rhombus, and this case also satisfies the condition that the internal angle is not a right angle. Moreover, in this case, although the long-side and short-side faces cannot be distinguished, one of the two pairs of facing faces is used as the long-side faces in the above-mentioned embodiment (Figure 1), and the other pair is used as the short-side faces (Figure 2), and the present invention can be implemented in the same manner as the above-mentioned embodiment.

Furthermore, if the shape of the long side and short side of the cross-section of the container can be distinguished (the cross-section is approximately rectangular) and the shape of the indistinguishable shape (the cross-section is approximately square), when the two are compared under the premise that the capacity of the container is the same, the former has the characteristic of reducing the width of the short side. This characteristic becomes an advantage of providing a container with a larger capacity (for example, more than 1.5L) by limiting the width of the short side to a limit that is easy to hold in the user's hand and making it easy to pick up the container.

In one aspect of the present invention, the presence or absence and arrangement of ribs in the lower portion are optional.

In one aspect of the present invention, the presence or absence and arrangement of ribs in the upper portion are optional.

In one aspect of the present invention, the number of arc-shaped ribs is arbitrary. Furthermore, when multiple ribs are provided, their arrangement is arbitrary, for example, the ribs may be provided in only one of the two regions of the shoulder divided by the diagonal line connecting the two apex portions A and A of the end portion provided with the ribs.

In one aspect of the present invention, the ribs may be discontinuous.

In one aspect of the present invention, the presence or absence of concave ribs along the boundary between the shoulder and the carcass is optional.

The presence or absence of markings in the present invention is optional. When markings are provided, the form is not limited to engraving, and protrusions, patterns, printing, stickers, etc. may also be used. In addition, the markings on the shoulder and the bottom may be in a form that consumers may recognize as a pair, and may be the same shape as in the above-mentioned embodiment, or may be related to different shapes. As an example of the latter, a combination of a circle and a cross, a convex part and a concave part, etc. may be listed.

2. Second embodiment The second embodiment of the resin container of the present invention is described with reference to the drawings. Hereinafter, an example of applying the resin container of the present invention to a plastic bottle 10 (hereinafter referred to as bottle 10) is described.

[Overall structure of the bottle] The bottle 10 of this embodiment is made of polyethylene terephthalate and is a colorless and transparent container. The bottle 10 is obtained by biaxial stretching blow molding using a preform made of polyethylene terephthalate as a raw material. In addition, the material constituting the bottle is not limited to polyethylene terephthalate, for example, polyethylene or polypropylene can also be used. In addition, the source of the material can be raw materials derived from petroleum, plants, recycled raw materials, etc.

In this embodiment, the capacity of the bottle 10 is set to 525 mL. However, the capacity of the bottle 10 is not particularly limited, and the capacity of the bottle 10 may be 200 mL to 2 L, such as 280 mL, 350 mL, 500 mL, etc., which are generally circulated.

The bottle 10 is used for filling liquid products such as soft drinks (carbonated drinks, fruit drinks, coffee drinks, tea drinks, mineral water, soy milk, vegetable drinks, sports drinks, cocoa drinks, etc.), alcoholic drinks, milk drinks, etc.; liquid foods such as soups; liquid seasonings such as soy sauce or soy sauce, etc.

The bottle 10 of the present embodiment has a mouth 12, a shoulder 13, a body 14, and a bottom 15 (FIG. 8 and FIG. 9). In the following description, when the up-down direction of the bottle 10 is mentioned, the up-down direction is indicated based on the posture of the bottle 10 being set in a manner that the bottom 15 is grounded (the posture shown in FIG. 8). That is, the upper side of the bottle 10 is the side of the mouth 12, and the lower side of the bottle 10 is the side of the bottom 15. And, when the transverse direction (or horizontal direction) of the bottle 10 is mentioned, it refers to the direction perpendicular to the above-mentioned up-down direction (that is, the left-right direction in FIG. 8 or the direction perpendicular to the paper surface).

The bottle 10 is roughly quadrangular in plan view (FIG. 9). In addition, roughly quadrangular is not limited to the shape of a quadrangle according to the mathematical definition, which means that a substantially quadrangular shape having rounded corners that can be provided as an industrial product is also possible. In addition, in this embodiment, the quadrangle is a square.

The mouth 12 is an opening for the liquid product filled therein to enter and exit, and its outer surface is provided with a male threaded portion for screwing a bottle cap (not shown). The shoulder 13 is a portion of the bottle 10 that gradually expands from the mouth 12 toward the body 14. In addition, the position in the direction of the height in which the bottle 10 gradually expands from the mouth 12 downward to the maximum limit is defined as the boundary between the shoulder 13 and the body 14. The bottom 15 is a portion that becomes a contact surface when the bottle 10 is placed on a surface such as a table, and the bottle 10 also gradually expands from the bottom 15 toward the body 14. In addition, the position in the direction of the height in which the bottle 10 gradually expands from the contact surface toward the top to the maximum limit is defined as the boundary between the bottom 15 and the body 14. The structure and function of the mouth 12, shoulder 13, and bottom 15 are substantially the same as those of the mouth, shoulder, and bottom of a known plastic bottle, so detailed description is omitted.

[Construction of the trunk] The trunk 14 is a roughly square tube-shaped portion (an example of a roughly square tube-shaped portion) extending between the shoulder 13 and the bottom 15, and has a longitudinal convex rib 141 extending in the up-down direction (an example of a convex rib extending in the up-down direction), and a transverse concave rib 142 extending in the horizontal direction (an example of a concave rib extending in the circumferential direction of the trunk). The trunk 14 is roughly square tube-shaped, so the trunk 14 has four face portions 143, and a ridge 144 extending in the up-down direction is formed at the portion where two face portions 143 meet. The trunk 14 is recognized to have projections and depressions due to the provision of the longitudinal convex rib 141 and the transverse concave rib 142, but is considered to be roughly square tube-shaped as a feature of operations during manufacturing or distribution. That is, the approximately quadrangular tube shape (approximately angular tube shape) described for the trunk 14 does not need to be a quadrangular tube shape (angular tube shape) in the mathematical sense.

The longitudinal ribs 141 are ribs protruding from the surface of the bottle 10, and are arranged along two ridges 144a located on the diagonal line in the plane view (Figure 9) among the four ridges 144 so as to be approximately parallel to the central axis X. Therefore, the two longitudinal ribs 141 are arranged at two symmetrical positions on the plane including the central axis X. In addition, "approximately parallel" means that the longitudinal ribs 141 are arranged in an industrially or practically parallel manner to the central axis X, and the two longitudinal ribs 141 do not need to be parallel in a mathematical sense. In addition, each longitudinal rib 141 extends continuously from the vicinity of the upper end of the body 14 (the boundary with the shoulder 13) to the vicinity of the lower end (the boundary with the bottom 15).

The transverse concave rib 142 is a rib that protrudes into the inner side of the bottle 10 and extends in the circumferential direction (horizontal direction) of the body 14. In this embodiment, seven transverse concave ribs 142 are provided.

The longitudinal convex ribs 141 and the transverse concave ribs 142 are arranged in a manner that the longitudinal convex ribs 141 are arranged to span seven transverse concave ribs 142. That is, the longitudinal convex ribs 141 are the parts protruding from the surface of the bottle 10 and extend continuously, while the transverse concave ribs 142 are the parts protruding into the inner side direction of the bottle 10 and are interrupted by the longitudinal convex ribs 141.

[Bottle folding method] In the bottle 10 of this embodiment, two longitudinal ribs 141 act as folds to induce bending of the body 14 on the two ridges 144a when the body 14 is flattened in order to fold the bottle 10. FIG. 10 shows the change in the cross-sectional shape of the body 14 when the body 14 is pressed so that the two ridges 144b without the longitudinal ribs 141 are close to each other. By this operation, the body 14 can be flattened.

FIG11 is an enlarged view of the longitudinal rib 141 in FIG10 and a view showing a case where the longitudinal rib 141 is not provided. When the longitudinal rib 141 is provided, the longitudinal rib 141, which is originally provided in a shape protruding outward, will bear the deformation of the ridge 144a, so the rebound force generated by the deformation is not easy to increase. On the other hand, when the longitudinal rib 141 is not provided, the corner portion 145, which is provided at a substantially right angle, will directly bear the deformation of the ridge 144a, so the rebound force is easy to increase as the deformation progresses.

Thus, the bottle 10 of the present embodiment can suppress the rebound force of the bent edge 144a by providing the longitudinal rib 141, so that a container that is easier to fold than conventional plastic bottles can be realized. In addition, suppressing the rebound force can also achieve the effect of suppressing the folded bottle 10 from returning to its original shape. Through these effects, the volume of the bottle 10 during storage, transportation, etc. for reuse or disposal after use can be reduced.

[Example] Hereinafter, the present embodiment will be further described using an example. However, the following example does not limit the present invention.

(Bottle used for testing) As an example, the bottle 10 of the above-mentioned embodiment is used (Figure 8, Figure 9).

As Comparative Example 1, a bottle 16 shown in Fig. 12 was used. The bottle 16 is the same as the bottle 10 except that the longitudinal convex rib 141 of the bottle 10 is replaced with a longitudinal concave rib 146 extending in the up-down direction.

As Comparative Example 2, a bottle 17 shown in Fig. 13 was used. The bottle 17 is the same as the bottle 10 and the bottle 16 except that it does not have ribs extending in the up-down direction.

(Test method) (1) Measurement of full capacity For each bottle of the embodiment and comparative example, the packaging mass and the mass after filling with water were measured. The value obtained by subtracting the two values was used as the full capacity of the bottle. The water filling was carried out by immersing the bottle in a horizontal position (with the mouth 12 and the bottom 15 arranged in the left and right directions) in a water tank filled with water that could completely immerse the bottle. In addition, the value obtained by this method is a mass (in grams), but it is regarded as an approximate value of the capacity (in mL) and is called "full capacity".

(2) Bottle flattening For each bottle of the embodiment and the comparative example, a ridge of the bottle is selected and three pressing points are set on the ridge. The first pressing point is set as the middle point between the first transverse concave rib 142 and the second transverse concave rib 142 from the bottom 15 side. The second pressing point is set as the middle point between the third transverse concave rib 142 and the fourth transverse concave rib 142 from the bottom 15 side. The third pressing point is set as the upper end of the body 14 (the boundary between the shoulder 13 and the body 14). The unit operation of flattening is set as an operation of deforming the bottle by pressing the pressing point with the index finger while supporting the ridge facing the pressing point with four fingers other than the index finger until the two facing ridges are connected to each other. This unit operation is performed in the order of the first pressing point, the second pressing point, and the third pressing point. In addition, the number of unit operations is once for each pressing point. In addition, the pressing point of bottle 10 (embodiment) is set at the ridge without the longitudinal convex rib 141; the pressing point of bottle 16 (comparative example 1) is set at the ridge without the longitudinal concave rib 146.

(3) Measurement of capacity after flattening After the bottles of the embodiment and the comparative example were flattened in the above-mentioned steps, the capacity after flattening was measured in the same way as the measurement of the full capacity. The volume residual rate, which is the ratio of the capacity after flattening to the full capacity, was compared. The smaller the volume residual rate, the greater the effect of reducing the empty container capacity by the flattening operation.

(Results) The residual volume rate of the embodiment is 53%; the residual volume rate of comparative example 1 is 60%; and the residual volume rate of comparative example 2 is 67%. That is, the bottle 10 provided with the longitudinal rib 141 has the greatest effect of reducing the volume of the empty container. From the above tests, it is confirmed that the embodiment realizes a bottle that is easy to fold and is not easy to return to its original shape after being folded.

[Other embodiments] Other embodiments of the resin container of the present invention are described. In addition, the structures disclosed in the following embodiments can also be combined with the structures disclosed in other embodiments for application as long as no contradiction occurs.

In one aspect of the present invention, the shape of the trunk is not limited, and may be, for example, cylindrical, etc. Furthermore, the aspect in which the trunk is substantially rectangular tube-shaped is not limited to a substantially rectangular tube-shaped having a substantially square cross section as in the above-mentioned embodiment, and may be a substantially rectangular tube-shaped having a non-substantially square cross section, or a substantially rectangular tube-shaped having a cross section of other polygonal shapes.

In one aspect of the present invention, the ribs may not be substantially parallel to the central axis X. For example, the ribs may be arranged obliquely relative to the direction in which the trunk extends, and the effect of the present invention of facilitating folding of the trunk may also be exhibited on the ribs.

In one aspect of the present invention, the ribs may be discontinuous.

In one aspect of the present invention, as long as the ribs are provided at two symmetrical positions on the plane including the central axis, more ribs may be provided. For example, in the above embodiment, in addition to the ridge 144a, the longitudinal rib 141 is provided on the ridge 144b, and a total of four ribs are provided. When the bottle 1 is folded, it can be bent on either the ridge 144a or the ridge 144b.

In one aspect of the present invention, the presence or absence of the concave rib is optional. Furthermore, the above description is based on the example of a configuration in which the longitudinal convex rib 141 is arranged to span seven transverse concave ribs 142, but when the concave rib is arranged, the positional relationship between the convex rib and the concave rib is not limited.

Regarding other structures, the implementation methods disclosed in this detailed manual are all examples in all points, and it should be understood that the scope of the present invention is not limited by them. Those with common knowledge in the technical field to which the present invention belongs should understand that appropriate changes can be made without departing from the scope of the subject matter of the present invention. Therefore, other implementation methods that are changed without departing from the scope of the subject matter of the present invention are of course also included in the scope of the present invention. [Industrial Applicability]

The present invention is a container that can be used for liquid products such as beverages.

1: First embodiment 1: Plastic bottle (bottle) 2: Mouth 3: Shoulder 31: Raised rib 32: Lower shoulder 33: Upper shoulder 34: Engraving 4: Body 41: Upper side 42: Specific part 42a: Part 42b: Concave part 43: Lower side 44: Side 45: Side 46: Rib 5: Bottom 51: Engraving 61: First transverse rib 62: Second transverse rib 63: Third transverse rib 64: Corrugated rib 65: Spring rib 65a: Groove part 65b: Small concave part 66: Fourth transverse rib 71: First longitudinal rib 72: Second longitudinal rib A: Vertex part B: Vertex part L1: Diagonal L2: Diagonal P: Parallelogram P1: Vertex P2: Vertex θ: Angle

2: Second implementation method 10: Plastic bottle 12: Mouth 13: Shoulder 14: Trunk 141: Longitudinal convex rib 142: Horizontal concave rib 143: Face 144: Ridge 15: Bottom 16: Plastic bottle (Comparative Example 1) 146: Longitudinal concave rib 17: Plastic bottle (Comparative Example 2) X: Center axis

[Fig. 1] is a front view of the bottle of the first embodiment. [Fig. 2] is a side view of the bottle of the first embodiment. [Fig. 3] is a top view of the bottle of the first embodiment. [Fig. 4] is a cross-sectional view of a specific portion of the body of the bottle of the first embodiment (a cross-sectional view on line IV-IV of Fig. 1). [Fig. 5] is a diagram showing the sequence of the folding method of the bottle of the first embodiment. [Fig. 6] is a diagram showing the sequence of the folding method of the bottle of the first embodiment. [Fig. 7] is a diagram showing the sequence of the folding method of the bottle of the first embodiment. [Fig. 8] is a front view of the bottle of the second embodiment. [Fig. 9] is a top view of the bottle of the second embodiment. [Fig. 10] is a cross-sectional view of the bottle of the second embodiment being folded in the middle. [Fig. 11] is a diagram comparing part XI of Fig. 10 with a case where no rib is provided. [Fig. 12] is a front view of a bottle of Comparative Example 1 compared with the embodiment of the second embodiment. [Fig. 13] is a front view of a bottle of Comparative Example 2 compared with the embodiment of the second embodiment.

1: Plastic bottle (bottle)

2: Mouth

3: Shoulders

4: Body

5: Bottom

31: Raised ribs

32: Lower shoulder

33: Upper shoulder

34: Engraving

41: Upper part

42: Specific parts

42a: Partial

42b: concave part

43: Lower part

46: Ribs

51: Engraving

61: First transverse rib

62: Second transverse rib

63: Third transverse rib

64: Corrugated ribs

65: Spring ribs

65a: Groove part

65b: small concave part

66: Fourth transverse rib

71: First longitudinal rib

72: Second longitudinal rib

Claims (29)

A resin container comprises a mouth, a shoulder, a body and a bottom, wherein the body is roughly a square tube, the shoulder has a shape that continuously connects the mouth and the body, at least a portion of the body is provided with a specific portion, the specific portion has a shape of a parallelogram whose internal angles are not right angles when two groups of facing sides in the cross section of the body are extended, the shoulder has an arc-shaped convex rib extending between two vertex portions, the two vertices are located in the vertex portion in a plan view, and the specific portion is directly above the vertex of the sharp angle of the parallelogram. A resin container as described in claim 1, wherein the two areas of the shoulder divided into two parts by a diagonal line connecting the two vertex parts facing each other in a plan view each have at least one rib. A resin container as described in claim 1, further comprising concave ribs along the boundaries of the shoulder and the body. A resin container as described in claim 1, wherein when the shoulder is bent along the rib and the body is bent, an eave-shaped protrusion is formed in the area between the mouth and the rib, so that the bottom and the protrusion are engaged. A resin container as described in claim 4, wherein a pair of marks are provided on the apex portion of the end of the shoulder where the rib is not provided, and on the apex portion of the bottom portion located directly below the apex portion. A resin container as described in any one of claims 1 to 5, wherein the body is divided into an upper portion, the specific portion, and a lower portion in sequence from the side connected to the shoulder toward the side connected to the bottom. A resin container as described in any one of claims 1 to 5, wherein the body has a lower side portion which is a portion between the specific portion and the bottom, and is provided with ribs extending along the boundary of the two faces connected in the lower side portion, corresponding to the boundary of the vertices of the sharp angles of the parallelogram in the specific portion. A resin container as described in any one of claims 1 to 5, wherein a rib is provided extending along the boundaries of two faces in the aforementioned specific portion, corresponding to the boundaries of the vertices of the sharp angles of the aforementioned parallelogram. A resin container as described in any one of claims 1 to 5, wherein a cross section of the body can distinguish a long side and a short side. A resin container having a mouth, a shoulder, a body, and a bottom, wherein the body is roughly prismatic, and at least a portion of the body is provided with a specific portion, the specific portion having a shape of a parallelogram whose internal angles are not right angles when two groups of facing sides in a cross-section of the body are extended. A resin container as described in claim 10, wherein the body is divided into an upper portion, the specific portion, and a lower portion in sequence from the side connected to the shoulder toward the side connected to the bottom. A resin container as described in claim 11, wherein the specific portion is more recessed inwardly than the upper portion and the lower portion. A resin container as described in claim 12, wherein the container has a recessed portion further recessed inward from the aforementioned specific portion. A resin container as described in claim 13, wherein the aforementioned specific portion is provided with transverse ribs extending in the circumferential direction. A resin container as described in claim 14, wherein a plurality of the transverse ribs are provided in parallel on a pair of opposing surfaces of the specific portion. A resin container as described in claim 10, wherein the body has a lower side portion serving as a portion between the specific portion and the bottom, and is provided with ribs extending along the boundary of two faces connected in the lower side portion, corresponding to the boundary of the vertices of the sharp angles of the parallelogram in the specific portion. A resin container as described in claim 10, wherein the body has an upper portion which is a portion between the specific portion and the shoulder, and is provided with ribs extending along the boundary between the shoulder and the upper portion. A resin container as described in any one of claims 10 to 17, wherein a rib is provided extending along the boundaries of two faces in the aforementioned specific portion, corresponding to the boundaries of the vertices of the sharp angles of the aforementioned parallelogram. A resin container as described in any one of claims 10 to 17, wherein the cross-section of the body can distinguish long sides and short sides. A resin container comprises a mouth, a shoulder, a body, and a bottom, wherein the body is roughly a square tube, the shoulder has a shape that continuously connects the mouth and the body, and the shoulder has an arc-shaped convex rib extending between two vertices facing each other in a plan view. A resin container as described in claim 20, wherein the two areas of the shoulder divided into two parts by a diagonal line connecting the two vertex parts facing each other in a plan view each have at least one rib. A resin container as described in claim 20, wherein the convex rib extends continuously between the two vertex portions. A resin container as described in claim 20, which also has concave ribs along the boundaries of the aforementioned shoulder and the aforementioned body. A resin container as described in any one of claims 20 to 23, wherein when the shoulder is bent along the rib and the body is bent, an eave-shaped protrusion is formed in the area between the mouth and the rib, so that the bottom and the protrusion are engaged. A resin container as described in claim 24, wherein a pair of marks are provided on the apex portion of the end of the shoulder where the rib is not provided, and on the apex portion of the bottom located directly below the apex portion. A resin container comprises a mouth, a shoulder, a body and a bottom. The body has ribs extending in the up-down direction at two positions symmetrical to a plane including a central axis connecting the center of the mouth and the center of the bottom. A resin container as described in claim 26, wherein the rib is substantially parallel to the center axis. A resin container as described in claim 26, wherein the body further comprises a concave rib extending in the circumferential direction of the body, and the convex rib spans across the concave rib. A resin container as described in claim 26, wherein the body is roughly cylindrical and the ribs are arranged along the edges of the body.

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