Resin container

Abstract

The present invention is provided with a mouth part (2), a shoulder part (3), a main body part (4), and a bottom part (5), the main body part (4) having a substantially square tubular shape, the shoulder part (3) having a shape continuously connecting the mouth part (2) and the main body part (4), and the main body part (4) being provided with a specific portion (42) on at least a part thereof. The shoulder portion (3) has a specific portion (42) having a shape that can form a parallelogram in which the interior angle is not a right angle when two sets of opposing sides on the cross-section of the main body portion (4) are extended, and the shoulder portion (3) has a circular arch-shaped bead (31) between two vertex portions that are, in the vertex portions in a plan view, in which the interior angle of the bead (31) is larger than the interior angle of the bead (31), and the interior angle of the bead (31) is larger than the interior angle of the bead (31). And two apex portions located directly above the apex of the acute angle of the parallelogram in the specific portion.

Description

Technical Field

[0001] The present invention relates to a resin container. Background Art

[0002] Resin containers are commonly used as containers for filling liquid products such as beverages and supplying them for circulation or sales. Compared with other containers, resin containers are lightweight, can be easily made into any shape according to the requirements of capacity or design, and can be transparent to easily identify the contents, so they are used in a wide range of applications.

[0003] When storing or transporting used resin containers for reuse or disposal, their volume may become a problem. For example, cans and paper containers are easy to flatten after use. However, due to the elasticity of resin, resin containers are sometimes difficult to flatten.

[0004] For this problem, for example, Japanese Patent Publication No. 2008-201448 (Patent Document 1) discloses a synthetic resin container having a unique transverse groove that locally bulges the side wall surface. In addition, Japanese Patent Publication No. 2008-56291 (Patent Document 2) discloses a container provided with a longitudinal ridge and a transverse ridge as a starting point for a folding operation.

[0005] Patent Literature Patent Document 1: Japanese Patent Application Publication No. 2008-201448 Patent Document 2: Japanese Patent Application Publication No. 2008-56291 Summary of the invention

[0006] However, the technology of Patent Document 1 only focuses on making the container easy to collapse, and does not consider folding the collapsed container. In addition, the technology of Patent Document 2 considers folding the shoulder and bottom of the container, but does not consider folding the main body that occupies the largest volume. Therefore, in the existing technology, there is room for improvement in suppressing the large volume of the container after use.

[0007] Therefore, there is a demand for a resin container whose main body portion can be easily crushed and folded.

[0008] The first resin container involved in the present invention is characterized in that it has a mouth, a shoulder, a main body and a bottom, the main body is roughly square cylindrical, the shoulder has a shape that continuously connects the mouth and the main body, and a specific part is provided on at least a portion of the main body, the specific part has a shape that can form a parallelogram whose internal angles are not right angles when two sets of opposite sides on the cross section of the main body are extended, the shoulder has a rounded arch-shaped ridge between two vertex parts, and the two vertex parts are, in the vertex parts in the top view, two vertex parts directly above the vertex of the acute angle of the parallelogram located in the specific part.

[0009] According to this structure, since the cross section of the specific part is roughly a parallelogram, compared with the existing container with a rectangular cross section, by applying force to close the vertices of the acute angles of the parallelogram, the specific part can be flattened more easily and flatly. Moreover, since the specific part becomes flat, it is easy to fold the container in the vertical direction with the specific part as the starting point. In addition, since the arch-shaped convex ridge becomes a positive fold when the shoulder is deformed in a manner that enters the inner side of the container, it becomes the starting point of the deformation, so it is easy to operate. Therefore, by bending the resin container into two halves on the main body and operating in a manner that the bottom protrudes into the shoulder, the shoulder can be easily flattened. In this way, according to the present invention, a resin container that can easily flatten the main body of the container and is easy to fold can be realized.

[0010] In one aspect, the first resin container according to the present invention preferably has at least one ridge in each of two regions of the shoulder portion bisected by a diagonal line connecting two apex portions facing each other in a plan view.

[0011] According to this configuration, the operation direction when the main body is folded in half is not restricted.

[0012] In one aspect, the first resin container according to the present invention preferably further includes a concave ridge along a boundary line between the shoulder portion and the body portion.

[0013] According to this configuration, since the concave ridge can function as a shoulder fold, the operation of squeezing the shoulder can be facilitated.

[0014] As one form, the first resin container involved in the present invention preferably has an eaves-like protrusion formed in the area between the mouth and the ridge when the shoulder is bent along the ridge and the main body is bent, so that the bottom can be engaged with the protrusion.

[0015] According to this configuration, since the bottom portion and the shoulder portion can be engaged with each other, the folded state of the resin container can be easily fixed.

[0016] In one embodiment, the first resin container according to the present invention preferably has a pair of marks provided at a vertex portion of the end portion of the shoulder portion where the ridge is not provided and a vertex portion of the bottom portion located directly below the vertex portion.

[0017] According to this configuration, the steps of the folding operation can be indicated to consumers and the like.

[0018] In one embodiment, the first resin container according to the present invention is preferably configured such that the main body is divided into an upper portion, the specific portion, and a lower portion in order from a side continuous with the shoulder portion toward a side continuous with the bottom portion.

[0019] According to this aspect, since the specific portion is located at the upper and lower center of the main body, it is easier to fold the container in half.

[0020] As one form, the first resin container involved in the present invention preferably has a main body having a portion between the specific portion and the bottom, i.e., a lower portion, and at the boundary line of the two faces in the lower portion, there is an edge extending along the boundary line continuously set along the boundary line corresponding to the vertex of the acute angle of the parallelogram in the specific portion.

[0021] According to this configuration, when the operation of squeezing the lower portion is performed, the ridge functions as a fold, and thus the lower portion can be easily squeezing.

[0022] In one aspect, the first resin container according to the present invention is preferably provided with an edge extending along a boundary line corresponding to a vertex of an acute angle of the parallelogram at a boundary line between two surfaces in the specific portion.

[0023] According to this configuration, when the operation of squeezing the specific portion is performed, the ridge functions as a fold, and thus the specific portion can be easily squeezing.

[0024] In one embodiment, the first resin container according to the present invention is preferably configured such that a long side and a short side can be distinguished in a cross section of the main body.

[0025] According to this configuration, compared with a container having the same capacity implemented in another shape, a container that is easier to hold can be provided.

[0026] The second resin container involved in the present invention is a resin container having a mouth, a shoulder, a main body and a bottom, and is characterized in that the main body is roughly prismatic, and a specific part is provided on at least a portion of the main body, and the specific part has a shape of a parallelogram whose internal angles are not right angles when two sets of opposite sides in the cross section of the main body are extended.

[0027] According to this configuration, since the cross section of the specific portion is a substantially parallelogram, the specific portion can be flattened more easily by applying force to close the vertices of the acute angles of the parallelogram, compared to a conventional container having a rectangular cross section. Furthermore, since the specific portion is flat, it is easy to fold the container in half in the vertical direction with the specific portion as a starting point. Thus, according to the present invention, a resin container can be realized in which the main body of the container is easily flattened and folded.

[0028] In one aspect, the second resin container according to the present invention is preferably configured such that the body is divided into an upper portion, the specific portion, and a lower portion in order from a side continuous with the shoulder portion toward a side continuous with the bottom portion.

[0029] According to this aspect, since the specific portion is located at the upper and lower center of the main body, it is easier to fold the container in half.

[0030] In one aspect, in the second resin container according to the present invention, it is preferable that the specific portion is recessed further inward than the upper portion and the lower portion.

[0031] According to this configuration, the specific portion can function as an appropriate gripping position for the user when gripping the container.

[0032] In one aspect, the second resin container according to the present invention preferably has a recessed portion that is further recessed inward from the specific portion.

[0033] According to this configuration, when the user holds the container, the user can hook his fingers into the recessed portion, thereby making it easier to hold the container more stably.

[0034] In one aspect, the second resin container according to the present invention is preferably provided with a lateral rib extending in the circumferential direction at the specific portion.

[0035] According to this configuration, it is easy to achieve both the strength of the container during use and the folding of the container after use at the specific portion.

[0036] In one embodiment, the second resin container according to the present invention preferably has a plurality of the horizontal ridges provided in parallel on a pair of opposing surfaces of the specific portion.

[0037] According to this structure, it is easy to further improve the strength of the surface on which the plurality of lateral ridges are provided in parallel.

[0038] As one form, the second resin container involved in the present invention preferably has a main body having a portion between the specific portion and the bottom, namely a lower portion, and at the boundary line of the two faces in the lower portion, there is an edge extending along the boundary line continuously set along the boundary line corresponding to the vertex of the acute angle of the parallelogram in the specific portion.

[0039] According to this configuration, when the operation of squeezing the lower portion is performed, the ridge functions as a fold, and thus the lower portion can be easily squeezing.

[0040] In one embodiment, the second resin container according to the present invention preferably has the body portion having an upper portion between the specific portion and the shoulder portion, and has a ridge extending along a boundary line between the shoulder portion and the upper portion.

[0041] According to this configuration, when the operation of squeezing the upper portion is performed, the ridge functions as a fold, and thus the upper portion can be easily squeezing.

[0042] In one embodiment, the second resin container according to the present invention is preferably provided with an edge extending along a boundary line corresponding to a vertex of an acute angle of the parallelogram at a boundary line between two surfaces in the specific portion.

[0043] According to this configuration, when the operation of squeezing the specific portion is performed, the ridge functions as a fold, and thus the specific portion can be easily squeezing.

[0044] In one embodiment, the second resin container according to the present invention is preferably configured such that a long side and a short side can be distinguished in a cross section of the main body.

[0045] According to this configuration, compared with a container having the same capacity implemented in another shape, a container that is easier to hold can be provided.

[0046] The third resin container involved in the present invention is characterized in that it has a mouth, a shoulder, a main body and a bottom, the main body is roughly square cylindrical, the shoulder has a shape that continuously connects the mouth and the main body, and the shoulder has a rounded ridge between two opposite vertex parts in the top view.

[0047] In this structure, when the shoulder is deformed so as to enter the inner side of the container, the arch-shaped ridge is folded positively, thereby becoming the starting point of deformation, so that the operation is easy. Therefore, by bending the resin container in half on the main body and operating so that the bottom protrudes into the shoulder, the shoulder can be easily flattened, so that the resin container can be easily folded.

[0048] In one aspect, the third resin container according to the present invention preferably has at least one ridge in each of two regions of the shoulder portion bisected by a diagonal line connecting two apex portions facing each other in a plan view.

[0049] According to this configuration, the operating direction when the main body is folded in half is not restricted.

[0050] In one aspect, in the third resin container according to the present invention, it is preferred that the ridge extends continuously between the two apex portions.

[0051] According to this configuration, by forming the ridge as a continuous ridge, the shoulder portion can easily function as a starting point for deformation.

[0052] In one aspect, the third resin container according to the present invention preferably further includes a concave ridge along a boundary line between the shoulder portion and the body portion.

[0053] According to this configuration, since the concave ridge functions as a shoulder fold, the operation of squeezing the shoulder is easy.

[0054] As one form, the third resin container involved in the present invention preferably has an eaves-like protrusion formed in the area between the mouth and the ridge when the shoulder is bent along the ridge and the main body is bent, so that the bottom can be engaged with the protrusion.

[0055] According to this configuration, since the bottom portion and the shoulder portion can be engaged with each other, the folded state of the resin container can be easily fixed.

[0056] In one aspect, the third resin container according to the present invention preferably has a pair of marks provided at a vertex portion of the end portion of the shoulder portion where the ridge is not provided and a vertex portion of the bottom portion located directly below the vertex portion.

[0057] According to this configuration, the steps of the folding operation can be indicated to consumers and the like.

[0058] The fourth resin container involved in the present invention is characterized in that it has a mouth, a shoulder, a main body and a bottom, and the main body has ridges extending in the up and down directions at two positions symmetrical with respect to a plane containing a central axis, and the central axis connects the center of the mouth with the center of the bottom.

[0059] According to this configuration, when the resin container is folded, the ridges function as folds, so that the main body can be folded more easily than in conventional resin containers.

[0060] In one aspect, in the fourth resin container according to the present invention, it is preferred that the ridges are substantially parallel to the central axis.

[0061] According to this configuration, since the resin container folded with the ridge as a fold line can be easily flattened, it is more advantageous in that the volume of the container after use can be suppressed.

[0062] In one embodiment, in the fourth resin container according to the present invention, the main body further includes a concave ridge extending in a circumferential direction of the main body, and the convex ridge preferably crosses the concave ridge.

[0063] According to this configuration, the resin container can achieve both improvement in strength by providing the concave ridges extending in the circumferential direction and ease of folding by using the convex ridges as folds.

[0064] In one aspect, in the fourth resin container according to the present invention, the main body is preferably substantially rectangular cylindrical, and the ridge is provided along a ridge of the main body.

[0065] When folding an object of a rectangular tube shape, the operation is performed along the edge, which is easy for the user to understand. According to the above structure, since the ridges that function as folds are provided at positions that are suitable for the easy-to-understand operation, the user can easily understand the folding operation.

[0066] Further features and advantages of the present invention will become more apparent from the following description of illustrative and non-limiting embodiments described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a front view of the bottle involved in the first embodiment. Figure 2 It is a side view of the bottle involved in the first embodiment. Figure 3 It is a top view of the bottle which concerns on 1st Embodiment. Figure 4 is a cross-sectional view of a specific portion of the main body of the bottle according to the first embodiment ( Figure 1 sectional view along line IV-IV). Figure 5 It is a figure which shows the procedure of the bottle folding method which concerns on 1st Embodiment. Figure 6 It is a figure which shows the procedure of the bottle folding method which concerns on 1st Embodiment. Figure 7 It is a figure which shows the procedure of the bottle folding method which concerns on 1st Embodiment. Figure 8 It is a front view of the bottle involved in the second embodiment. Fig. 9 It is a top view of the bottle which concerns on 2nd Embodiment. Fig.10 This is a cross-sectional view of the bottle according to the second embodiment when it is in the process of being folded. Fig.11 Yes Fig.10 FIG. XI is a diagram comparing the case where no ridges are provided. Fig.12 It is a front view of a bottle of Comparative Example 1 for comparison with the Example according to the second embodiment. Fig.13 It is a front view of a bottle of Comparative Example 2 for comparison with the Example according to the second embodiment. DETAILED DESCRIPTION

[0068] 1. First Implementation A first embodiment of a resin container according to the present invention will be described with reference to the drawings. Hereinafter, an example in which the resin container according to the present invention is applied to a plastic bottle 1 (hereinafter simply referred to as a bottle 1) will be described.

[0069] (Overall composition of the bottle) The bottle 1 involved in this embodiment is made of polyethylene terephthalate and is a colorless and transparent container. The bottle 1 is obtained by biaxial stretch 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, and may be polyethylene or polypropylene, for example. In addition, the source of the material may be petroleum, plant-derived raw materials, recycled raw materials, etc.

[0070] In the present embodiment, the capacity of the bottle 1 is set to 2 L. However, the capacity of the bottle 1 is not particularly limited, and may be about 200 mL to 2 L, such as 280 mL, 350 mL, 500 mL, etc., which are generally circulated.

[0071] The bottle 1 is used to fill liquid products such as beverages such as refreshing drinks (carbonated drinks, fruit drinks, coffee drinks, tea drinks, mineral water, soy milk, vegetable drinks, sports drinks, cocoa drinks, etc.), alcoholic drinks, milk drinks, liquid foods such as soups, and liquid seasonings such as sauces or soy sauces.

[0072] The bottle 1 according to the present embodiment includes a mouth 2, a shoulder 3, a body 4 and a bottom 5 ( Figure 1 and Figure 2 In the following description, when the vertical direction of the bottle 1 is mentioned, it means the posture of the bottle 1 set in such a way that the bottom 5 is grounded ( Figure 1 and Figure 2That is, the upper side of the bottle 1 is the mouth 2 side, and the lower side of the bottle 1 is the bottom 5 side. In addition, when the lateral direction (or horizontal direction) of the bottle 1 is mentioned, it means the direction orthogonal to the above-mentioned up-down direction (that is, the direction perpendicular to the above-mentioned up-down direction). Figure 1 In addition, a pair of opposite sides of the bottle 1 have the same shape.

[0073] In a top view, the bottle 1 is a generally quadrilateral ( Figure 3 ). In addition, the generally quadrilateral shape is not limited to the shape of a quadrilateral defined by mathematics, and may be a shape that can be substantially regarded as a quadrilateral and is provided with a rounded shape or the like as an industrial product. More specifically, the quadrilateral is a rectangle, and for the side of the bottle 1, the surface on the long side of the cross section ( Figure 1 ) and the short side face ( Figure 2 ).

[0074] The mouth 2 is an opening for storing and accessing a liquid product filled therein, and an external threaded portion for screwing a cap (not shown) is provided on its outer surface. The shoulder 3 is a portion of the bottle 1 that gradually expands from the mouth 2 toward the main body 4. In addition, the height direction position after the bottle 1 is gradually expanded from the mouth 2 toward the bottom and is expanded to the maximum is defined as the boundary between the shoulder 3 and the main body 4. The bottom 5 is a portion that becomes a ground 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 main body 4. In addition, the height direction position after the bottle 1 is gradually expanded from the ground contact surface toward the top and is expanded to the maximum is defined as the boundary between the bottom 5 and the main body 4. Since 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, a detailed description is omitted.

[0075] (Shoulder structure) The shoulder 3 has a shape that continuously connects the mouth 2 and the main body 4. Since the mouth 2 is a shape in which an external thread is provided on the outer surface of a substantially cylindrical body, and the main body 4 is a substantially quadrangular column shape, the cross section of the shoulder 3 is substantially circular at the upper end, and substantially quadrilateral at the lower end. Figure 3 ) in which the shape of the shoulder 3 is a roughly quadrilateral shape at the lower end.

[0076] Two arch-shaped ridges 31 are provided on the shoulder 3. Each ridge 31 extends continuously between two apex portions A and A facing each other in a top view. In addition, one ridge 31 is provided in each of two regions of the shoulder 3 divided into two parts by a diagonal line L1 connecting the two apex portions A and A. In addition, a "ridge" refers to an edge in a shape protruding from the surface of the bottle 1.

[0077] In the side view ( Figure 2), the ridge 31 extends obliquely upward at an angle of about 45° from the end portion located at the vertex portion A. Near the diagonal line L2 connecting the vertex portions B and B different from the vertex portions A and A, the height direction position of the ridge 31 becomes the maximum.

[0078] By providing the ridge 31 on the shoulder 3, the shoulder 3 can be easily folded along the ridge 31. More specifically, the shoulder 3 can be bent in a positive fold using the ridge 31. At this time, the area between the main body 4 and the ridge 31, that is, the shoulder lower part 32, can be inserted below the area between the mouth 2 and the ridge 31, that is, the shoulder upper part 33. By deforming the shoulder 3 in this way, the shoulder upper part 33 becomes an eaves-like protrusion, which can play a role of engaging with the bottom 5 when the main body 4 is bent (described later).

[0079] A circular stamp 34 (an example of a mark) is applied to the apex portions B, B of the shoulder portion 3 (the apex portions of the end portions where the ridge 31 is not provided). Figure 1 to Figure 3 ). In addition, a circular imprint 51 (an example of a mark) is also applied to the bottom 5. ( Figure 1 , Figure 2 The position where the marking 51 is applied to the bottom 5 is the vertex portion located directly below the vertex portions B and B of the shoulder 3. In addition, the marking 51 being located directly below the marking 34 means that the marking 51 is located downward along the surface of the bottle 1 from the marking 34 ( Figure 1 and Figure 2 In other words, in the configuration on the bottle 1, it is sufficient that the imprint 51 is "directly below" the imprint 34, and the imprint 34 and the imprint 51 do not need to be strictly on the same vertical line. In addition, in the following description, when the upper and lower positional relationship between the components is referred to as "directly above" or "directly below", it also refers to the upper and lower positional relationship in the configuration on the bottle 1, and they do not need to be strictly on the same vertical line.

[0080] (Composition of the main body) The main body 4 is divided into an upper part 41, a specific part 42, and a lower part 43 in order from the side (upper side) continuously provided with the shoulder 3 toward the side (lower side) continuously provided with the bottom 5. Due to the difference in the horizontal dimensions of the upper part 41, the specific part 42, and the lower part 43 and the provision of a plurality of edges (described later), the main body 4 has concave and convex shapes when observed in the front view and the side view, but as a feature of use during manufacturing or circulation, it can be used as a roughly square tube. That is, the roughly square tube shape for the main body 4 means that it does not need to be a square tube shape in the mathematical sense.

[0081] (1) Upper part 41 The upper portion 41 is a portion of the main body 4 that is located above the specific portion 42, that is, a portion between the specific portion 42 and the shoulder 3. The upper portion 41 is provided with a first transverse ridge 61 (an example of a concave ridge) along the boundary line between the shoulder 3 and the upper portion 41 and a plurality of (five in this embodiment) second transverse ridges 62 ( Figure 1 and Figure 2 The first transverse edge 61 is a surface on the long side of the cross section ( Figure 1 ) and the short side faces ( Figure 2 ) are provided on each surface (all four surfaces) of the bottle 1 with a length converging within the range of each surface (referring to the ridges protruding into the inner side of the bottle 1, the same applies to the following). The depth of the first transverse ridge 61 is uniform. In addition, the depth of the concave ridge refers to the depth of the ridge protruding into the inner side of the bottle 1, which is the same for the other concave ridges below.

[0082] The second transverse rib 62 is a concave rib provided along the horizontal direction on the entire circumference of the upper portion 41. The second transverse rib 62 has a wavy shape with deep portions and shallow portions alternately provided. More specifically, the deep portion is provided on the portion corresponding to the side of the cross section, and the shallow portion is provided on the portion corresponding to the vertex of the cross section.

[0083] In addition, the cross-sectional shape of the upper portion 41 is similar to the top view of the bottle 1 ( Figure 3 ) are substantially the same.

[0084] (2) Specific section 42 The specific portion 42 is formed as a portion that is recessed further toward the inside of the bottle 1 than the upper portion 41 and the lower portion 43 ( Figure 1 and Figure 2 ). Figure 4 FIG. 4 shows a cross section of a specific portion 42. In this cross section, two sets of opposite sides 44 and 45 can be observed, and the side 44 of one set is aligned with the surface on the long side ( Figure 1 ) corresponds to the side 45 of the other group and the surface on the short side ( Figure 2 ) correspond to each other. When the two sets of opposite sides 44 and 45 are extended, a parallelogram P can be formed. The parallelogram P has a vertex P1 with an acute internal angle and a vertex P2 with an obtuse internal angle, so the internal angles of the parallelogram P are not right angles. That is, the parallelogram P is not a rectangle.

[0085] The positional relationship between the vertex portion A (the end portion provided with the ridge 31) and the vertex portion B (provided with the engraving 34) on the shoulder 3 and the vertex P1 (acute angle) and the vertex P2 (obtuse angle) on the specific portion 42 is that the vertex portion A is located directly above the vertex P1, and the vertex portion B is located directly above the vertex P2.

[0086] The surface along the long side of the specific portion 42 ( Figure 1 ) and the short side face ( Figure 2 ), and the first longitudinal ridge 71 is provided. More specifically, among the boundaries between the long side surface and the short side surface, the first longitudinal ridge 71 is provided on two boundaries corresponding to the vertices P1 of the acute angle of the parallelogram P. In addition, in the present embodiment, the first longitudinal ridge 71 is a convex ridge provided in a form of protruding to the outside of the bottle 1.

[0087] The specific portion 42 has a concave portion 42b that is further recessed inward from the main portion 42a of the specific portion 42. The concave portion 42b is provided on the surface ( Figure 1 ) in the left-right direction center. In addition, a cross-shaped ridge 46 is provided in the center of the recessed portion 42b. The ridge 46 is composed of two orthogonal concave ridges.

[0088] A third transverse rib 63 extending in the circumferential direction is provided on the main portion 42a of the specific portion 42. More specifically, three third transverse ribs 63 are arranged in parallel in the height direction on the left and right sides of the recess 42b, wherein the length of the central rib is slightly longer than the lengths of the upper and lower ribs ( Figure 1 , Figure 2 The third transverse ridges 63 are concave ridges, and their depths are uniform. In addition, a first longitudinal ridge 71 is provided in a form that crosses the three third transverse ridges 63 .

[0089] The specific portion 42 can function as an appropriate gripping position when the user grips the bottle 1. First, since the specific portion 42 is formed as a portion that is recessed further toward the inside of the bottle 1 than the upper portion 41 and the lower portion 43, even a user with a relatively small hand can easily and naturally grip the specific portion 42. Second, since the user can hook his fingers into the recess 42b when gripping the specific portion 42, it is easy to stably grip the bottle 1.

[0090] On the premise that the parallelogram P is a parallelogram, the size of the internal angles of the acute angles and obtuse angles of the parallelogram P is not limited. In other words, using an angle θ greater than 0°, the internal angle of the vertex of the acute angle is expressed as 90°-θ, and the internal angle of the vertex of the obtuse angle is 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, it is preferred that θ is greater than 1° and less than 30°. The cross-sectional shape of the specific portion 42 is a parallelogram P, which can bring about the effect of facilitating the operation of flattening the specific portion 42 (described later), but when θ is greater than 1°, it is particularly easy to show this effect. In addition, when θ is less than 30°, it is not easy to damage the function of the specific portion 42 as a holding position of the bottle 1. It is more preferred that θ is greater than 3°, and it is further preferred that it is greater than 4°. In addition, it is more preferred that θ is less than 10°, and it is further preferred that it is less than 6°.

[0091] (3) Lower part 43 The lower portion 43 is a portion of the main 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 portion 43 is provided with a wavy edge 64, a spring edge 65, and a plurality of (two in this embodiment) fourth transverse edges 66 in order from top to bottom. These edges are all concave edges. In addition, the surface ( Figure 1 ) and the short side face ( Figure 2 ) is provided along the two intersection lines below the first longitudinal ridge 71. The second longitudinal ridge 72 is a convex ridge provided in the form of crossing the wavy ridge 64 and the fourth transverse ridge 66. In addition, the cross-sectional shape of the lower portion 43 is similar to that of the top view of the bottle 1 ( Figure 3 ) are substantially the same.

[0092] The wavy rib 64 is a rib provided in a shape whose position in the vertical direction changes continuously along the circumference of the lower portion 43. The spring rib 65 includes a groove portion 65a provided on the entire circumference of the lower portion 43, and a small recess 65b formed one above and one below the groove portion 65a on the entire circumference of the lower portion 43. In addition, the entire spring rib 65 including the groove portion 65a and the small recess 65b can also be understood as one rib.

[0093] The fourth transverse rib 66 is provided along the horizontal direction on 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.

[0094] (How to fold the bottle) By providing the above-mentioned components on the bottle 1 involved in this embodiment, a container that is more easily folded than the existing plastic bottle can be realized. By folding the bottle 1 after use, the volume of the bottle 1 after use can be reduced when it is stored or transported for reuse or disposal. The following is a description of a method for folding the bottle 1.

[0095] First, an operation of flattening the specific portion 42 is performed ( Figure 5 ). Specifically, the two faces on the long side of the cross section are moved differently from each other in a manner toward the vertex P1 (acute angle) of the parallelogram P of the cross section. When this operation is performed, the specific portion 42 is deformed (squashed) in a manner such that the internal angle of the vertex P1 of the parallelogram P becomes smaller and the internal angle of the vertex P2 approaches 180°.

[0096] In this embodiment, since the cross section of the specific portion 42 is a parallelogram, when a force is applied in a manner to close the acute-angled vertex P1, the internal angle is easily deformed by the force. Therefore, compared with the existing plastic bottle with a rectangular cross section, the specific portion 42 can be flattened more easily and more flatly. In addition, by setting the first longitudinal ridge 71 in a form protruding outward from the bottle 1, the mobility of the vertex P1 portion that is deformed in a manner that its internal angle becomes smaller can be improved. In this way, the first longitudinal ridge 71 functions as a fold, which also helps to make the above-mentioned deformation easier.

[0097] Second, the bottle 1 is folded at the specific portion 42 after being flattened ( Figure 6 ). At this time, the operation can be performed by making the bottom 5 abut against the shoulder 3, and the shoulder 3 can be moved in a manner that the imprint 34 is consistent with the imprint 51 of the bottom 5. The imprint 34 and the imprint 51 are the same circular imprint shape, which can serve to indicate the operation to the consumer.

[0098] After the bottom 5 is brought into contact with the shoulder 3, when the bottom 5 is pressed onto the shoulder 3, the shoulder 3 is folded positively on the convex ridge 31, the shoulder lower portion 32 enters below the shoulder upper portion 33, and the shoulder upper portion 33 becomes an eave-shaped protrusion. The protrusion is finally engaged with the bottom 5, and can play a role in fixing the state of the bottle 1 folded in half. In addition, when performing this operation, the first transverse ridge 61 functions as a fold, and the shoulder 3 can be easily flattened.

[0099] Third, the upper part 41, the lower part 43 and the bottom 5 are flattened. If 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 7At this time, if the mouth 2 is folded in a turned-up manner and the upper shoulder portion 33 is operated so as to cover the bottom 5, the folded state of the bottle 1 can be easily fixed. In addition, like the first longitudinal ridge 71, the second longitudinal ridge 72 functions as a fold, making it easy to flatten the lower portion 43.

[0100] In this embodiment, since the cross section of the specific portion 42 is a parallelogram and the shape after being flattened becomes flat, it is easier to bend the specific portion 42 up and down compared to the existing plastic bottle. In addition, since the ridge 31 is provided on the shoulder 3, the bottom 5 is easy to engage, so it is easy to fix the bottle 1 in the folded state. In this way, the bottle 1 is easier to fold than the existing similar containers, thereby reducing the occupied volume when reused or discarded.

[0101] (Other embodiments) Other embodiments of the resin container according to the present invention will be described. In addition, the configuration disclosed in each of the following embodiments may be combined and applied with the configuration disclosed in other embodiments, provided that no contradiction occurs.

[0102] In one aspect of the present invention, as long as the main body is provided with a specific part, the number of divisions of the main body is not limited. For example, the entire area of ​​the main body may be provided as a specific part. In addition, the main body may be divided into two areas including the specific part. That is, the main body may be divided into an upper part and a specific part, or may be divided into a specific part and a lower part.

[0103] In one embodiment of the present invention, the structure of the specific portion is not limited under the premise that when two sets of opposite sides on the cross section of the specific portion are extended, a parallelogram shape whose internal angles are not right angles can be formed.

[0104] In one aspect of the present invention, the presence or absence and arrangement of edges in a specific portion can be arbitrary. Therefore, one or both of these edges may not be provided. In addition, other edges of these edges may also be provided.

[0105] In one embodiment of the present invention, the shape may be a substantially square in the top view, or may be a shape in which the long side and short side faces of the cross section cannot be distinguished. At this time, the parallelogram formed by extending the two sets of opposite sides on the cross section of the specific portion is a rhombus, and in this case, the condition that the internal angle is not a right angle is also satisfied. In addition, in this case, although the long side and short side faces cannot be distinguished, as long as one of the two pairs of two opposite faces is used as the long side face in the above-mentioned embodiment ( Figure 1 ), and the other pair as the short-side faces ( Figure 2), the present invention can be implemented in the same manner as the above-mentioned embodiment.

[0106] In addition, if a shape that can distinguish the long side and short side of the cross section of the container (the cross section is approximately rectangular) is compared with a shape that cannot distinguish the shape (the cross section is approximately square), then under the premise that the capacity of the container is the same, when comparing the two, the former has a feature that the width of the short side surface can be reduced. The advantage of this feature is that in a container with a larger capacity (for example, more than 1.5L), the width of the short side surface can be suppressed to a limit that is easy to accommodate in the user's hand, thereby providing a container that is easy to hold.

[0107] In one aspect of the present invention, the presence or absence and arrangement of ridges in the lower portion are optional.

[0108] In one aspect of the present invention, the presence or absence and arrangement of ridges in the upper portion are optional.

[0109] In one embodiment of the present invention, the number of the arch-shaped ridges is arbitrary. In addition, when a plurality of ridges are provided, their arrangement is arbitrary, for example, the ridges may be provided only on one of the two regions of the shoulder bisected by a diagonal line connecting the two apex portions of the end portion where the ridges are provided.

[0110] In one aspect of the present invention, the ridges may be discontinuous.

[0111] In one aspect of the present invention, the presence or absence of a concave ridge along the boundary line between the shoulder portion and the body portion is optional.

[0112] In the present invention, the presence or absence of a mark is arbitrary. When a mark is provided, its form is not limited to engraving, and it can also be a protrusion, a pattern, a print, a sticker, etc. In addition, the marks on the shoulder and the bottom can be in the form of a pair of marks that can be recognized by consumers, etc., and can be the same shape as in the above embodiment, or different shapes related to each other. As an example of the latter, a combination of a circle and a cross, a convex part and a concave part, etc. can be exemplified.

[0113] 2. Second Implementation A second embodiment of the resin container according to the present invention will be described with reference to the drawings. Hereinafter, an example in which the resin container according to the present invention is applied to a plastic bottle 10 (hereinafter simply referred to as a bottle 10 ) will be described.

[0114] (Overall composition of the bottle) The bottle 10 involved in this embodiment is made of polyethylene terephthalate and is a colorless and transparent container. The bottle 10 is obtained by biaxial stretch 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, and may be polyethylene or polypropylene, for example. In addition, the source of the material may be petroleum, plant-derived raw materials, recycled raw materials, etc.

[0115] In the present embodiment, the capacity of the bottle 10 is 525 mL, but the capacity of the bottle 10 is not particularly limited, and may be about 200 mL to 2 L, such as 280 mL, 350 mL, 500 mL, etc., which are usually circulated.

[0116] The bottle 10 is used to fill liquid products such as beverages such as refreshing drinks (carbonated drinks, fruit drinks, coffee drinks, tea drinks, mineral water, soy milk, vegetable drinks, sports drinks, cocoa drinks, etc.), alcoholic drinks, milk drinks, liquid foods such as soups, liquid seasonings such as sauces or soy sauces, etc.

[0117] The bottle 10 according to the present embodiment includes a mouth 12, a shoulder 13, a body 14, and a bottom 15 ( Figure 8 , Fig. 9 In the following description, when the up-down direction of the bottle 10 is mentioned, it means the posture of the bottle 10 set in such a way that the bottom 15 is grounded ( Figure 8 That is, the upper side of the bottle 10 is the mouth 12 side, and the lower side of the bottle 10 is the bottom 15 side. In addition, when the lateral direction (or horizontal direction) of the bottle 10 is mentioned, it refers to the direction orthogonal to the above-mentioned up-and-down direction (that is, the direction perpendicular to the above-mentioned up-and-down direction). Figure 8 left-right direction or direction perpendicular to the paper surface).

[0118] In a top view, the bottle 10 is a generally quadrilateral ( Fig. 9 ). In addition, the substantially quadrilateral is not limited to the shape of a quadrilateral defined by mathematics, and may be a shape that can be substantially regarded as a quadrilateral and is provided with chamfers, etc., as an industrial product. In addition, in the present embodiment, the quadrilateral is a square.

[0119] The mouth 12 is an opening for storing and accessing a liquid product filled therein, and an external threaded portion for screwing a cap (not shown) is provided on its outer surface. The shoulder 13 is a portion of the bottle 10 that gradually expands from the mouth 12 toward the main body 14. In addition, the height direction position after the bottle 10 is gradually expanded from the mouth 12 toward the bottom and is expanded to the maximum extent is defined as the boundary between the shoulder 13 and the main body 14. The bottom 15 is a portion that becomes a ground 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 main body 14. In addition, the height direction position after the bottle 10 is gradually expanded from the ground contact surface toward the top and is expanded to the maximum extent is defined as the boundary between the bottom 15 and the main body 14. Since the structures and functions 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, detailed description is omitted.

[0120] (Composition of the main body) The main body 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 ridge 141 extending in the vertical direction (an example of a convex ridge extending in the vertical direction) and a transverse concave ridge 142 extending in the horizontal direction (an example of a concave ridge extending in the circumferential direction of the main body). Since the main body 14 is roughly square tube-shaped, the main body 14 has four face portions 143, and a ridge portion 144 extending in the vertical direction is formed at the portion where the two face portions 143 meet. Although the main body 14 has concavities and convexities due to the provision of the longitudinal convex ridge 141 and the transverse concave ridge 142, it can be used as a roughly square tube-shaped portion as a feature of use during manufacturing or circulation. That is, the roughly square tube-shaped portion (roughly square tube-shaped portion) for the main body 14 does not necessarily need to be a square tube-shaped portion (square tube-shaped portion) in a mathematical sense.

[0121] The longitudinal ridge 141 is a ridge protruding from the surface of the bottle 10, and is arranged so as to extend along the four ridges 144 in the top view ( Fig. 9 ) are located on the two diagonal ridges 144a in the main body 14, and are roughly parallel to the central axis X. Therefore, the two longitudinal ridges 141 are arranged at two positions symmetrical with respect to the plane containing the central axis X. In addition, "roughly parallel" means that the longitudinal ridges 141 are arranged in a state that is regarded as being parallel to the central axis X in industrial or practical terms, and the two longitudinal ridges 141 do not need to be parallel in a mathematical sense. In addition, each longitudinal ridge 141 extends continuously from the vicinity of the upper end of the main body 14 (the boundary with the shoulder 13) to the vicinity of the lower end (the boundary with the bottom 15).

[0122] The transverse concave ridges 142 are ridges that protrude inwardly of the bottle 10 and extend in the circumferential direction (horizontal direction) of the main body 14. In the present embodiment, seven transverse concave ridges 142 are provided.

[0123] The longitudinal convex ribs 141 and the transverse concave ribs 142 are in a relationship in which the longitudinal convex ribs 141 are arranged to cross seven transverse concave ribs 142. That is, the portion of the longitudinal convex ribs 141 protruding from the surface of the bottle 10 extends continuously, whereas the portion of the transverse concave ribs 142 protruding toward the inner side of the bottle 10 is interrupted by the longitudinal convex ribs 141.

[0124] (How to fold the bottle) In the bottle 10 according to the present embodiment, when the main body 14 is crushed to fold the bottle 10 , the two longitudinal ridges 141 function as folds, causing the main body 14 to bend at the two ridges 144 a . Fig.10 The figure shows the change in the cross-sectional shape of the main body 14 when the main body 14 is pressed so that the two ridges 144 b without the longitudinal ridges 141 are brought close to each other. This operation allows the main body 14 to be flattened.

[0125] Fig.11 Yes Fig.10 The enlarged view of the longitudinal rib 141 in the figure is shown in parallel with the view when 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, bears the deformation of the ridge portion 144a, so the rebound force generated by the deformation is not easy to increase. On the contrary, when the longitudinal rib 141 is not provided, the corner portion 145, which is provided at a substantially right angle, directly bears the deformation of the ridge portion 144a, so the rebound force is likely to increase as the deformation progresses.

[0126] In this way, since the bottle 10 involved in this embodiment is provided with the longitudinal ridge 141, the rebound force on the bent ridge portion 144a can be suppressed, and thus a container that is easier to fold can be realized compared with the existing plastic bottle. In addition, suppressing the rebound force also plays a role in suppressing the folded bottle 10 from returning to its original shape. Through these effects, the volume of the used bottle 10 when it is folded for storage, transportation, etc. for reuse or disposal can be reduced.

[0127] (Example) Hereinafter, the present embodiment will be further described using examples. However, the following examples do not limit the present invention.

[0128] (Bottles used in the test) As an example, the bottle 10 ( Figure 8 , Fig. 9 ).

[0129] As Comparative Example 1, Fig.12The bottle 16 shown is the same as the bottle 10 except that the bottle 16 is provided with a vertically extending concave ridge 146 instead of the vertical convex ridge 141 of the bottle 10.

[0130] As Comparative Example 2, Fig.13 Bottle 17 is shown. Bottle 17 is the same as bottles 10 and 16 except that it does not have edges extending in the vertical direction.

[0131] (Test method) (1) Determination of full filling capacity For each bottle of the embodiment and comparative example, the tare mass and the mass after filling with water were measured. The value obtained by subtracting the two is the full filling capacity of the bottle. The filling of water is performed by immersing the bottle in a horizontal posture (meaning the posture in which the mouth 12 and the bottom 15 are arranged in the left-right direction) into a water tank filled with water in an amount that can completely immerse the bottle. In addition, although the value obtained by this method is a mass (in grams), it can be regarded as an approximate value of the capacity (in mL), so it is called "full filling capacity".

[0132] (2) Bottle crushing For each bottle of the embodiment and comparative example, one edge of the bottle is selected, and three pressing points are set on the edge. The first pressing point is the middle point between the first transverse concave ridge 142 and the second transverse concave ridge 142 from the bottom 15 side. The second pressing point is the middle point between the third transverse concave ridge 142 and the fourth transverse concave ridge 142 from the bottom 15 side. The third pressing point is the upper end of the main body 14 (the boundary between the shoulder 13 and the main body 14). The unit operation of flattening is the following operation: while supporting the edge opposite to the pressing point with four fingers other than the thumb, press the pressing point with the thumb to deform the bottle until the two opposite edges contact each other. The 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, for bottle 10 (Example), the pressing point is set on the edge portion where the longitudinal convex rib 141 is not provided, and for bottle 16 (Comparative Example 1), the pressing point is set on the edge portion where the longitudinal concave rib 146 is not provided.

[0133] (3) Determination of capacity after flattening After the bottles of the embodiments and comparative examples were crushed by the above steps, the capacity after crushing was measured by the same method as the full filling capacity. The volume residual ratios expressed as a percentage of the capacity after crushing relative to the full filling capacity were compared. It can be said that the smaller the volume residual ratio, the greater the effect of reducing the empty container capacity by the crushing operation.

[0134] (result) The residual volume ratio of the embodiment is 53%, the residual volume ratio of the comparative example 1 is 60%, and the residual volume ratio of the comparative example 2 is 67%. That is, the effect of reducing the volume of the empty container is the greatest in the bottle 10 provided with the longitudinal ridge 141. Through the above test, it is confirmed that in the embodiment, a bottle that is easy to fold and does not easily return to its original shape after folding can be realized.

[0135] (Other embodiments) Other embodiments of the resin container according to the present invention will be described. In addition, the configuration disclosed in each of the following embodiments may be applied in combination with the configuration disclosed in other embodiments, provided that no contradiction occurs.

[0136] In one form of the present invention, the shape of the main body is not limited, and may be, for example, cylindrical, etc. In addition, the main body is in a substantially rectangular tube shape, and is not limited to a substantially square tube shape with a substantially square cross section as in the above-mentioned embodiment, and may be in a substantially square tube shape with a cross section that is not substantially square, or in a substantially rectangular tube shape with a cross section that is another polygonal shape.

[0137] In one embodiment of the present invention, the ribs may not be substantially parallel to the central axis X. For example, even if the ribs are provided obliquely with respect to the direction in which the main body extends, the ribs can also provide the effect of the present invention that the main body is easily folded.

[0138] In one aspect of the present invention, the ridges may be discontinuous.

[0139] In one embodiment of the present invention, under the premise of providing ridges at two positions symmetrical to the plane including the central axis, further ridges may be provided in addition to the ridges. For example, in the above-mentioned embodiment, when a longitudinal ridge 141 is provided on the ridge 144b in addition to the ridge 144a, and a total of four ridges are provided, when the bottle 1 is folded, it can be bent on either the ridge 144a or the ridge 144b.

[0140] In one form of the present invention, the presence or absence of the concave ribs is arbitrary. In addition, although the following structure is used as an example in the above description, that is, the longitudinal convex rib 141 is arranged to cross the seven transverse concave ribs 142, when the concave ribs are arranged, the positional relationship between the convex ribs and the concave ribs is not limited.

[0141] Regarding other configurations, it should be understood that the embodiments disclosed in this specification are illustrative in all aspects, and the scope of the present invention is not limited thereto. Those skilled in the art can easily understand that, within the scope of not departing from the purpose of the present invention, appropriate changes can be made. Therefore, other embodiments that are changed within the scope of not departing from the purpose of the present invention are certainly also included in the scope of the present invention. Industrial Applicability

[0142] The present invention can be used, for example, in containers for liquid products such as beverages. Explanation of symbols

[0143] 1. First Implementation 1-Plastic bottle (bottle); 2-mouth; 3-Shoulder; 31- convex ridge; 32 - lower part of the shoulder; 33 - upper part of shoulder; 34-imprint; 4-Main body; 41 - upper part; 42-Specific parts; 42a-section; 42b-concave; 43 - lower part; 44-side; 45-side; 46-edges; 5-Bottom; 51-engraving; 61- first transverse ridge; 62- second transverse ridge; 63-third transverse ridge; 64-wavy edges; 65-spring edge; 65a-slot portion; 65b-small depression; 66- fourth transverse ridge; 71-first longitudinal ridge; 72-second longitudinal ridge; A-apex part; B-apex part; L1 - diagonal; L2 - diagonal; P - parallelogram; P1-vertex; P2-vertex; θ - angle.

[0144] 2. Second embodiment 10-Plastic bottle; 12-mouth; 13-shoulder; 14-main body; 141-longitudinal ridge; 142- transverse concave ridge; 143-face; 144-edge; 15- bottom; 16-Plastic bottle (Comparative Example 1); 146-longitudinal concave ridge; 17-Plastic bottle (Comparative Example 2); X-center axis.

Claims

1. A resin container, characterized in that: The invention comprises a mouth, a shoulder, a main body and a bottom, wherein the main body is substantially in the shape of a square tube, and the shoulder has a shape that continuously connects the mouth and the main body. A specific portion is provided on at least a portion of the main body, wherein the specific portion has a shape that can form a parallelogram whose internal angles are not right angles when two sets of opposite sides on a cross section of the main body are extended. The shoulder portion has a rounded ridge between two vertex portions, which are two vertex portions located directly above the vertices of the acute angles of the parallelogram located in the specific portion, among the vertex portions in the top view.

2. The resin container according to claim 1, characterized in that At least one ridge is provided in each of two regions of the shoulder divided by a diagonal line, and the diagonal line connects the two opposite apex portions in a top view.

3. The resin container according to claim 1, wherein: The invention also has a concave ridge along the boundary line between the shoulder portion and the main body portion.

4. The resin container according to claim 1, wherein: When the shoulder portion is bent along the ridge and the main body portion is bent, an eave-shaped protrusion is formed in a region between the mouth portion and the ridge, and the bottom portion can be engaged with the protrusion.

5. The resin container according to claim 4, characterized in that A pair of marks are provided at the apex portion of the end portion of the shoulder portion where the ridge is not provided and at the apex portion of the bottom portion located directly below the apex portion.

6. The resin container according to any one of claims 1 to 5, characterized in that: The main body is divided into an upper portion, the specific portion, and a lower portion in sequence from a side continuously provided with the shoulder portion toward a side continuously provided with the bottom portion.

7. The resin container according to any one of claims 1 to 5, characterized in that: The main body has a lower portion, which is a portion between the specific portion and the bottom. In the boundary line between the two surfaces in the lower portion, an edge is provided that extends along a boundary line that is provided continuously with the boundary lines corresponding to the vertices of the acute angles of the parallelogram in the specific portion.

8. The resin container according to any one of claims 1 to 5, characterized in that: In a boundary line between two surfaces in the specific portion, an edge extending along the boundary line corresponding to a vertex of an acute angle of the parallelogram is provided.

9. The resin container according to any one of claims 1 to 5, characterized in that: With respect to the cross section of the main body portion, a long side and a short side can be distinguished.

10. A resin container comprising a mouth, a shoulder, a body and a bottom, characterized in that: The main body is roughly prism-shaped. A specific portion is provided on at least a portion of the main body, the specific portion having a shape that can form a parallelogram whose internal angles are not right angles when two sets of opposite sides in a cross section of the main body are extended.

11. The resin container according to claim 10, wherein: The main body is divided into an upper portion, the specific portion, and a lower portion in sequence from a side continuously provided with the shoulder portion toward a side continuously provided with the bottom portion.

12. The resin container according to claim 11, wherein The specific portion is recessed further inward than the upper portion and the lower portion.

13. The resin container according to claim 12, wherein: A concave portion is provided which is further recessed inward from the specific portion.

14. The resin container according to claim 13, wherein: The specific portion is provided with a transverse rib extending in the circumferential direction.

15. The resin container according to claim 14, characterized in that A plurality of the transverse ribs are arranged in parallel on a pair of opposite surfaces of the specific portion.

16. The resin container according to claim 10, wherein: The main body has a lower portion between the specific portion and the bottom. In the boundary line between the two surfaces in the lower portion, an edge is provided that extends along a boundary line that is provided continuously with the boundary lines corresponding to the vertices of the acute angles of the parallelogram in the specific portion.

17. The resin container according to claim 10, wherein: The main body has an upper portion, which is a portion between the specific portion and the shoulder portion. A ridge extending along a boundary line between the shoulder portion and the upper portion is provided.

18. The resin container according to any one of claims 10 to 17, characterized in that: In a boundary line between two surfaces in the specific portion, an edge extending along the boundary line corresponding to a vertex of an acute angle of the parallelogram is provided.

19. The resin container according to any one of claims 10 to 17, characterized in that: With respect to the cross section of the main body portion, a long side and a short side can be distinguished.

20. A resin container, characterized in that: The invention comprises a mouth, a shoulder, a main body and a bottom, wherein the main body is substantially in the shape of a square tube, and the shoulder has a shape that continuously connects the mouth and the main body. The shoulder portion has a rounded ridge between two opposite apex portions in a top view.

21. The resin container according to claim 20, wherein: At least one ridge is provided in each of two regions of the shoulder divided by a diagonal line, and the diagonal line connects the two opposite apex portions in a top view.

22. The resin container according to claim 20, wherein: The ridge extends continuously between the two vertex portions.

23. The resin container according to claim 20, wherein: The invention also has a concave ridge along the boundary line between the shoulder portion and the main body portion.

24. The resin container according to any one of claims 20 to 23, characterized in that: When the shoulder portion is bent along the ridge and the main body portion is bent, an eave-shaped protrusion is formed in a region between the mouth portion and the ridge, and the bottom portion can be engaged with the protrusion.

25. The resin container according to claim 24, wherein: A pair of marks are provided at the apex portion of the end portion of the shoulder portion where the ridge is not provided and at the apex portion of the bottom portion located directly below the apex portion.

26. A resin container, characterized in that: It has a mouth, shoulder, body and bottom. The main body has ridges extending in the up-down direction at two positions symmetrical with respect to a plane including a central axis connecting the center of the mouth and the center of the bottom.

27. The resin container according to claim 26, wherein: The convex ridge is substantially parallel to the central axis.

28. The resin container according to claim 26, wherein The main body also has a concave ridge extending in the circumferential direction of the main body. The convex ridges cross the concave ridges.

29. The resin container according to claim 26, wherein: The main body is roughly cylindrical. The convex ridge is arranged along the ridge of the main body.

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