JP4992329B2 - Plastic container - Google Patents

Description

  The present invention relates to a bottle-shaped synthetic resin container mainly having a carbonated beverage as a content and having pressure resistance, and particularly relates to a synthetic resin container that is particularly suitable as a beverage container for sale by a vending machine.

  For example, various synthetic products formed by molding plastics such as polyethylene terephthalate into bottles by blow molding etc. as beverage containers for carbonated drinks such as cola and cider, fruit juice drinks, coffee drinks, drinking water and teas. Resin containers are generally widely used.

  Among such synthetic resin containers, a bottle-type beverage container containing carbonated beverages has pressure resistance enough to withstand the pressurized state in the container with carbon dioxide gas and can be self-supporting. Is required. For this reason, for example, a pressure-resistant bottle having a bottom portion having a so-called petaloid shape as described in Patent Document 1 is known.

Japanese Patent Laid-Open No. 2-57545

  By the way, in recent years, this type of synthetic resin container has been rapidly spreading and penetrating, and with the widespread use, the form of sales of products using synthetic resin containers has also diversified. Yes. Under such circumstances, beverage containers having a relatively small capacity are increasingly used for sales by vending machines in addition to over-the-counter sales.

  However, the conventional pressure bottle, in order to increase the pressure resistance, greatly curved the vertical cross-sectional shape of the container shoulder along the height direction, and made it shoulder-like, and in the petaloid shape formed on the bottom of the container, The outer peripheral surface of the leg portion is a curved surface that is narrowed downward, and the portion that continues linearly along the height direction on the side surface of the container is shortened. For this reason, when the container is placed horizontally, the grounding state becomes unstable, and if it is going to be sold as it is by the vending machine, it rolls so that it rises when it rolls sideways in the column of the vending machine. There was a problem of clogging that would cause the column to change its direction and jam.

  In addition, when a conventional pressure-resistant bottle is filled and sealed with the contents and the inside of the container is in a pressurized state, the shoulder portion and the vicinity thereof are deformed, and accordingly the entire container extends in the height direction. The tendency is strong. Therefore, when designing the container shape, the dimensions must be controlled in consideration of changes in the height of the container after filling and sealing the contents, and usually the height of the cylindrical container body is high. Although the problem can be dealt with by shortening the length, such a countermeasure promotes the problem as described above.

  The present invention has been proposed in order to solve the problems of the conventional techniques as described above, and when offered for sale by a vending machine, the grounding state when placed horizontally is stabilized. An object of the present invention is to provide a synthetic resin container capable of effectively avoiding clogging in a column by making a linearly continuous portion on the side of the container long.

  A synthetic resin container according to the present invention that solves the above problems includes a mouth portion, a shoulder portion, a trunk portion, and a bottom portion, and the trunk portion is a cylinder having a substantially straight longitudinal section along the container height direction. A synthetic resin container having a shape, wherein a shoulder vertical surface substantially flush with a side surface of the trunk portion and a shoulder inclined surface inclined downward toward the outer side in the radial direction of the container are formed on the shoulder portion. A plurality of ridges that are radially arranged, and a difference in height along the container height direction between the adjacent ridges and the shoulder inclined surface is on the outer side in the container radial direction. It is the structure which provided the shoulder groove part which has the groove bottom which becomes large gradually as it goes.

In the synthetic resin container according to the present invention adopting such a configuration, when the inside of the container is in a pressurized state, the shoulder part swells so that the groove bottom of the shoulder groove part is pushed out of the container. In the vicinity of the base of the mouth, a force directed toward the inside of the container acts. As a result, the mouth portion is pushed downward relative to the container, and the extension in the height direction of the container due to the increase in internal pressure is offset by that amount, and the change in the height of the container is suppressed. Therefore, unlike the conventional pressure-resistant bottle, it is not necessary to shorten the height of the container body, and it is possible to ensure the length of the linearly continuous portion on the side surface of the container.
In addition, the shoulders are provided with raised portions having a shoulder vertical surface that is substantially flush with the side surface of the body portion, and are arranged radially so that the linearly continuous portion of the side surface of the container is further lengthened. Is possible. For this reason, the grounding state when the container is placed horizontally is further stabilized, and it is possible to more effectively avoid clogging in the column when the container is used for sale by a vending machine.

  Further, the synthetic resin container according to the present invention is a plane in which the groove bottom of the shoulder groove part intersects the virtual plane including the container center axis substantially perpendicularly in order to suppress the change in the height of the container due to the shape change of the shoulder part. Or a cross section that is a curved surface and is along the width direction of the shoulder groove portion, and is a cross section cut by a virtual plane parallel to the container center axis, the groove bottom of the shoulder groove portion and the side wall surface of the shoulder groove portion Is preferably in the range of 100 to 170 °.

  In addition, the synthetic resin container according to the present invention is designed to increase the degree to which the change in the height of the container is suppressed by the change in the shape of the shoulder while considering the pressure resistance of the container. The ratio of the maximum groove depth of the shoulder groove portion is preferably 0.01 to 0.15, the maximum width of the groove bottom of the shoulder groove portion is 0 to 20 mm, and the minimum width is 0 to 10 mm. Is preferred.

  Further, in the synthetic resin container according to the present invention, the shoulder groove portions are provided at 4 to 10 at substantially equal intervals along the circumferential direction so that the shoulder portions are uniformly deformed along the circumferential direction. preferable.

In addition, the synthetic resin container according to the present invention, along with the container height direction of the shoulder vertical surface with respect to the container height excluding the mouth, in order to secure a linearly continuous portion of the container side surface The ratio of the length is preferably 0.01 to 0.15, and the ratio of the length of the linearly continuous portion of the container side surface to the container height excluding the mouth is 0.4 to 0. .9 is more preferable.
Moreover, it is preferable that the ratio of the diameter of the said trunk | drum with respect to the container height except the said mouth part is 0.4-0.7.

  According to the present invention as described above, it is possible to lengthen a linearly continuous portion along the container height direction on the side surface of the container, and it is possible to stabilize the ground contact state when the container is placed horizontally. As a result, clogging in the column can be effectively avoided when the vending machine is used for sales.

Hereinafter, a preferred embodiment of a synthetic resin container according to the present invention will be described with reference to the drawings.
1 is a schematic front view showing an example of a synthetic resin container according to the present embodiment, FIG. 3 is a cross-sectional view of a main part corresponding to the AA cross section of FIG. 1, and FIG. It is principal part sectional drawing equivalent to the BB cross section.

  The container 1 shown in FIG. 1 is a predetermined container by, for example, forming a bottomed cylindrical preform by injection molding or extrusion molding of a thermoplastic resin, and biaxially stretching blow-molding the preform. It can be manufactured by shaping the shape.

  In the illustrated example, the container 1 includes a mouth part 2, a shoulder part 3, a trunk part 4, and a bottom part 5, and a lid body (not shown) is attached to the mouth part 2 after filling the contents. The inside of the container 1 can be sealed.

The container 1 generally has a container shape called a round bottle, and the body 4 occupying most of the height direction of the container 1 is a cylindrical shape having substantially the same diameter, and the container height The longitudinal cross-sectional shape along the direction is substantially linear.
Here, the container height direction means a direction orthogonal to the horizontal plane when the container 1 is placed on the horizontal plane with the mouth portion 2 facing up.

  Furthermore, the shoulder portion 3 of the container 1 has a shoulder vertical surface 32a that is substantially flush with the side surface of the body portion 4, a shoulder inclined surface 32b that is inclined downward toward the outer side in the container radial direction, and A plurality of (in the illustrated example, six) raised portions 32 are provided in a radial pattern. And the shoulder groove part 31 which has the groove bottom 31a from which the height difference along the container height direction with the shoulder part inclined surface 32b becomes large gradually toward the container radial direction outer side between the adjacent protruding parts 32 is provided. The shoulder groove portions 31 and the raised portions 32 are alternately arranged along the circumferential direction.

  The container 1 in the present embodiment is mainly composed of carbonated beverages and has pressure resistance sufficient to withstand the pressurized state in the container, but the shoulder 3 shaped in such a shape is When the contents are filled and sealed and the inside of the container is in a pressurized state, the groove bottom 31a of the shoulder groove 31 is swelled so as to be pushed outward (in the direction indicated by arrow F1 in FIG. 3). Become. Along with this, a force toward the inside of the container (the direction indicated by the arrow F2 in FIG. 3) acts on the vicinity of the base portion of the mouth portion 2, and the mouth portion 2 is relatively pushed down below the container. become.

  In general, pressure-resistant bottles that contain carbonated beverages and other contents tend to stretch in the height direction when the container is pressurized, so when designing the container shape, fill the contents. The dimensions must be controlled in consideration of changes in the height of the container after sealing. In general, this is dealt with by reducing the height of the cylindrical container body part, which promotes clogging in the column when the vending machine is used for sale.

  On the other hand, by making the shape of the shoulder part 3 as described above, the extension in the height direction of the container 1 can be offset by the amount by which the mouth part 2 is pushed down, and the change in the height of the container 1 is changed. It is suppressed. Therefore, it is not necessary to shorten the height of the body part 4 as in a conventional pressure-resistant bottle, and it is possible to ensure the length of a linearly continuous portion on the side surface of the container.

  In addition, the shoulder portion 3 is provided with raised portions 32 having a shoulder vertical surface 32a that is substantially flush with the side surface of the body portion 4, and is provided in a radial manner. It becomes possible to make it even longer. For this reason, the grounding state when the container 1 is placed horizontally is further stabilized, and it becomes possible to more effectively avoid clogging in the column when the container 1 is sold by the vending machine.

  In providing the shoulder groove portion 31 on the shoulder portion 3, the groove bottom 31 a of the shoulder groove portion 31 may be flat or curved, but the symmetry of the shoulder groove portion 31 is enhanced, In order to prevent the internal pressure load from being biased, it is preferable that the internal pressure load intersects the imaginary plane including the central axis C substantially perpendicularly, and usually has a symmetrical shape as illustrated.

In addition, side wall surfaces 31b that rise obliquely are connected to both edges in the width direction of the groove bottom 31a. In suppressing the height change of the container 1 by the shape change of the shoulder portion 3, the inclination of the side wall surface 31 b is a cross section along the width direction of the shoulder groove portion 31, and is a virtual plane parallel to the central axis C. In an arbitrary cut cross section (see FIG. 2), the angle [θ1] formed by the groove bottom 31a and the side wall surface 31b is preferably in the range of 100 to 170 °.
If this angle [θ1] is less than the lower limit of the above range, the mold 1 is inferior in releasability such that the container 1 is likely to be damaged by rubbing against the mold (blow mold) at the time of mold release. The performance tends to be insufficient, and the pressure resistance performance tends to be insufficient even when the upper limit of the above range is exceeded.
2 is a cross-sectional view of the main part of the container 1 showing an arbitrary cross section cut along a virtual plane parallel to the central axis C, which is a cross section along the width direction of the shoulder groove portion 31.

Furthermore, in order to increase the degree to which the height change of the container 1 is suppressed by the shape change of the shoulder portion 3 while considering the pressure resistance performance of the container 1, the maximum of the shoulder groove portion with respect to the diameter [D1] of the trunk portion is increased. The ratio [H31 / D1] of the groove depth [H31] is preferably 0.01 to 0.15.
If this ratio [H31 / D1] is less than the lower limit of the above range, pressure resistance tends to be insufficient. Further, if the upper limit of the above range is exceeded, the desired container shape cannot be accurately shaped, and a thin-walled portion tends to be produced, resulting in poor formability.

The width [W31a] of the groove bottom 31a of the shoulder groove portion 31 can be set in consideration of the pressure resistance required for the container 1, the degree of shape change of the shoulder portion 3 and the like, but the maximum width is 0. It is preferably ˜20 mm, and the minimum width is preferably 0 to 10 mm.
If the maximum width and the minimum width of the groove bottom 31a both exceed the upper limit of the above range and become too thick as a whole, the pressure resistance performance tends to be insufficient.
When the maximum width and the minimum width of the width [W31a] of the groove bottom 31a of the shoulder groove portion 31 are both 0 mm, the cross section along the width direction of the shoulder groove portion 31 is V-shaped or U-shaped. As described above, the side wall surfaces 31b intersect each other directly. In this case, the intersection line may be handled as the groove bottom 31a. That is, when the inside of the container is in a pressurized state, the intersecting line of the side wall surface 31b swells so as to be pushed out of the container, and accordingly, a force toward the container in the vicinity of the base portion of the mouth portion 2 acts. Thus, the mouth 2 is relatively pushed down the container.

  In the illustrated example, the six shoulder groove portions 31 are provided at substantially equal intervals along the circumferential direction. However, in order to deform the shoulder portion 3 as evenly as possible along the circumferential direction, The number of shoulder groove portions 31 to be provided is preferably 4-10.

  In the illustrated example, in addition to the shoulder 3 having the shape as described above, a plurality of (six in the illustrated example) legs 52 are provided on the bottom 5 of the container 1. It has been. At the same time, a bottom groove portion 51 is provided between the adjacent leg portions 52 so that a part of the bottom portion 5 is recessed into the container, and the same number of bottom groove portions 51 and leg portions 52 are provided. Are alternately arranged along the circumferential direction.

The leg portion 52 is disposed around the bottom surface 53 located substantially at the center of the bottom portion 5, and has a grounding portion 52 c that projects downward from the bottom surface 53. The grounding portion 52c can be made self-supporting by coming into contact with a grounding surface (not shown). In consideration of the self-supporting property of the container 1 at this time, the grounding portion 52c is grounded with respect to the diameter [D1] of the trunk portion 4. The ratio [D2 / D1] of the ground contact diameter [D2] of the part 52c is preferably 0.5 to 0.9.
If this ratio [D2 / D1] is less than the lower limit of the above range, there is a tendency for grounding to fail and the tipping over easily. Further, if the upper limit of the above range is exceeded, there is a tendency that the formability tends to be inferior and the bottom may be damaged due to residual stress during storage in a high temperature and high humidity environment.

  In the illustrated example, the six leg portions 52 are provided at substantially equal intervals along the circumferential direction. This is to approximate the cross-sectional shape of the bottom portion 5 to a circular shape to improve the rolling suitability of the container 1. From this viewpoint, the number of leg portions 52 provided on the bottom portion 5 is 4 to 4. 10 is preferred.

  Further, as shown in the figure, the leg portion 52 is inclined to the inner side in the container radial direction while being connected to the leg vertical surface 52a and the leg vertical surface 52a substantially flush with the side surface of the trunk portion 4. The lower end edge of the leg inclined surface 52b is connected to the ground contact part 52c.

By shaping such a shape on the bottom portion 5, the outer peripheral surface of the leg portion 52 provided on the bottom portion 5 is substantially perpendicular to the side surface of the trunk portion 4 without impairing the pressure resistance of the bottom portion 5. (The leg vertical surface 52a). This makes it possible to lengthen the linearly continuous portion along the container height direction on the side of the container, stabilize the grounding state when the container 1 is placed horizontally, and sell it by a vending machine. It is possible to effectively avoid clogging in the column.
In addition, when making the linearly continuous part along the container height direction of the container side surface longer, the leg part 52 provided in the bottom part 5 is made into the same number as the protruding part 32 provided in the shoulder part 3, and both It is preferable to match the position in the container height direction, and this makes it possible to make the portion that is continuous on the same straight line the longest.

Here, in order to stabilize the grounding state when the container 1 is placed horizontally, the shape as described above is formed on the bottom portion 5 and the linearly continuous portion of the side surface of the container is lengthened. The ratio [H5 / D1] of the length [H5] (see FIG. 5) along the container height direction of the bottom 5 to the diameter [D1] is preferably 0.25 to 0.65.
If this ratio [H5 / D1] is less than the lower limit of the above range, the pressure resistance tends to be insufficient. Further, if the upper limit of the above range is exceeded, the formability tends to be inferior.
Furthermore, the ratio [H52 / H5] of the length [H52] (see FIG. 5) along the container height direction of the leg vertical surface 52a to the length [H5] along the container height direction of the bottom portion 5 is 0.2 to 0.9 is preferable.
If this ratio [H52 / H5] is less than the lower limit of the above range, the effect of suppressing clogging tends to be hardly obtained. Further, if the upper limit of the above range is exceeded, the formability tends to be inferior.

  Further, when the bottom groove portion 51 is provided in the bottom portion 5, the groove bottom 51 a of the bottom groove portion 51 may be a flat surface or a curved surface, similarly to the groove bottom 31 a of the shoulder groove portion 31. In order to enhance the symmetry as a left-right symmetric shape as shown in the figure and to prevent the internal pressure load on the bottom groove 51 from being biased, it intersects substantially perpendicularly to the virtual plane including the central axis C. The same is preferable.

Further, the side wall surface 51b that rises obliquely is connected to both edges in the width direction of the groove bottom 51a as in the case of the shoulder groove portion 31. However, the inclination of the side wall surface 51b depends on the width direction of the bottom groove portion 51. In an arbitrary cross section taken along a virtual plane parallel to the central axis C (see FIG. 4), an angle [θ2] formed by the groove bottom 51a and the side wall surface 51b is 95 to 170 °. It is preferable to be within the range.
If this angle θ2 is less than the lower limit of the above range, it tends to be inferior in releasability and formability. Further, if the upper limit of the above range is exceeded, the pressure resistance performance tends to be insufficient.
FIG. 4 is a cross-sectional view of the main part of the container 1 showing an arbitrary cross section cut along a virtual plane parallel to the central axis C, which is a cross section along the width direction of the bottom groove portion 51.

Further, when the bottom groove portion 51 is provided in the bottom portion 5, the groove depth can be set in consideration of the shape of the bottom portion and the like. For example, the bottom groove portion 51 has a diameter [D 1] with respect to the body portion 4. The ratio [H51 / D1] of the maximum groove depth [H51] (see FIG. 5) is preferably 0.05 to 0.25.
If this ratio [H51 / D1] is less than the lower limit of the above range, the pressure resistance performance tends to be insufficient. Moreover, when the upper limit of the above range is exceeded, the formability tends to be inferior.

In order to make the shape of the bottom shape good, it is preferable that the groove bottom 51a of the bottom groove 51 and the leg inclined surface 52b are substantially parallel to each other, and the bottom of the grounding portion 52c is downward. It is preferable that the inclination angle [θ3] (see FIG. 5) of the leg inclined surface 52b with respect to a virtual plane (grounding surface) in contact with the base is 20 to 60 °.
If the inclination angle [θ3] is less than the lower limit of the above range, the shapeability tends to be inferior, and the problem of overstretching that causes whitening beyond the stretching limit tends to occur. If the upper limit of the above range is exceeded, the effect of suppressing clogging tends to be hardly obtained.

In addition, the width [W51a] of the groove bottom 51a of the bottom groove portion 51 can be set in consideration of the pressure resistance performance required for the container 1, but the maximum width is 1 to 20 mm, and the minimum width is 1 It is preferably 10 mm.
If the maximum width and the minimum width of the groove bottom 51a are both too small and less than the lower limit of the above range, or are too thick overall exceeding the upper limit of the above range, the pressure resistance performance is insufficient. Tend to.

Further, the groove bottom 51a of the bottom groove 51 has a ratio [A1 / A] of the total projected area [A1] of the groove bottom 51a to the container plane projected area [A] when the total projected area of the groove bottom 51a is A1. ] Is preferably 0.05 to 0.4.
If this ratio [A1 / A] is less than the lower limit of the above range, the pressure resistance tends to be insufficient. Further, when the upper limit of the above range is exceeded, pressure resistance is insufficient and the formability tends to be inferior.
FIG. 6 is a bottom view of the container 1, and the projection surface of the groove bottom 51a is indicated by oblique lines.

Further, in securing a linearly continuous portion on the side surface of the container, the length [H32] along the container height direction of the shoulder vertical surface 32a with respect to the container height [H1] excluding the mouth 2 (see FIG. 3)) [H32 / H1] is preferably 0.01 to 0.15.
If this ratio [H32 / H1] is less than the lower limit of the above range, the effect of suppressing clogging tends to be hardly obtained. If the upper limit of the above range is exceeded, the formability tends to be inferior and overstretching tends to occur.

Further, the ratio [H2 / H1] of the length [H2] of the linearly continuous portion of the container side surface to the container height [H1] excluding the mouth 2 is 0.4 to 0.9. preferable.
If this ratio [H2 / H1] is less than the lower limit of the above range, the effect of suppressing clogging tends to be hardly obtained. Further, if the upper limit of the above range is exceeded, the pressure resistance performance tends to be insufficient.
Note that the length [H2] of the linearly continuous portion of the side surface of the container is the container of the surface in which the shoulder vertical surface 32a, the side surface of the trunk 4 and the leg vertical surface 52a are continuous in the illustrated example. Although it becomes the maximum length along the height direction, the position of the raised portion 32 provided on the shoulder portion 3 and the leg portion 52 provided on the bottom portion 5 is determined in the container height direction when the bottom shape as illustrated is not formed. If they do not coincide with each other, the maximum length along the container height direction of the continuous surface including at least the shoulder vertical surface 32a and the side surface of the trunk portion 4 is obtained.

Moreover, it is preferable that ratio [D1 / H1] of diameter [D1] of body part 4 to container height [H1] except mouth 2 is 0.4-0.7.
If this ratio [D1 / H1] is less than the lower limit of the above range, the body 4 tends to swell, and the pressure resistance tends to be insufficient. If the upper limit of the above range is exceeded, the effect of suppressing clogging tends to be hardly obtained.

  Here, the container height [H1] excluding the mouth part 2 is the height from directly below a neck ring generally provided in this type of container to the grounding surface where the grounding part 52c is grounded, as shown in the figure. It shall be the length along the direction.

In the present embodiment, the container 1 can be manufactured by blow molding as described above, but the thermoplastic resin constituting the container 1 is not particularly limited as long as blow molding is possible. For example, an arbitrary resin such as a polyester-based resin such as polyethylene terephthalate, or a resin obtained by making a friend with another resin can be used.
In addition, the container 1 may have a single layer or a layer structure composed of two or more thermoplastic resin layers, but may include other layers such as a gas barrier layer that suppresses permeation of carbon dioxide gas as necessary. You may do it.

  Although the present invention has been described with reference to the preferred embodiment, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. .

  Further, the present invention can be applied to a synthetic resin container having an internal volume of about 200 to 2000 ml, and among them, it is particularly suitable for use as a pressure-resistant bottle having a relatively small internal volume of about 200 to 500 ml.

  As described above, the present invention provides a bottle-shaped synthetic resin container having pressure resistance that can be suitably used for sale by a vending machine.

It is a front view showing an outline of an embodiment of a synthetic resin container according to the present invention. It is a principal part sectional view showing an arbitrary section which is a section along the width direction of a shoulder groove part, and was cut by a virtual plane parallel to a central axis. It is principal part sectional drawing equivalent to the AA cross section of FIG. It is a cross section along the width direction of the bottom groove part, and is a main part cross-sectional view showing an arbitrary cross section cut by a virtual plane parallel to the central axis. It is principal part sectional drawing equivalent to the BB cross section of FIG. It is a bottom view showing an outline of an embodiment of a synthetic resin container according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container 2 Mouth part 3 Shoulder part 31 Shoulder groove part 31a Groove bottom 31b Side wall surface 32 Raised part 32a Shoulder vertical surface 32b Shoulder inclined surface 4 Trunk part 5 Bottom part 51 Bottom groove part 51a Groove bottom 51b Side wall surface 52 Leg part 52a Leg part Vertical surface 52b Leg inclined surface 52c Grounding portion 53 Bottom surface C Center axis

Claims (8)

A mouth portion, a shoulder portion, a trunk portion, and a bottom portion, and the trunk portion is a synthetic resin container having a substantially straight cylindrical shape in a longitudinal section along the container height direction,
The shoulder portion has a shoulder vertical surface substantially flush with a side surface of the body portion, a shoulder inclined surface inclined downward toward the outer side in the radial direction of the container, and a plurality of radially arranged While providing a ridge,
A shoulder groove portion having a groove bottom in which a height difference along the container height direction with the shoulder inclined surface gradually increases toward the outer side in the container radial direction is provided between the adjacent raised portions. A synthetic resin container. The groove bottom of the shoulder groove portion consists of a plane that intersects the imaginary plane including the container center axis substantially perpendicularly, or a curved surface,
In the cross section along the width direction of the shoulder groove portion, the angle formed by the groove bottom of the shoulder groove portion and the side wall surface of the shoulder groove portion in a cross section cut by a virtual plane parallel to the container central axis is 100. The synthetic resin container according to claim 1, which is in a range of ˜170 °.   The synthetic resin container according to any one of claims 1 to 2, wherein a ratio of a maximum groove depth of the shoulder groove portion to a diameter of the trunk portion is 0.01 to 0.15.   The synthetic resin container according to any one of claims 1 to 3, wherein a maximum width of a groove bottom of the shoulder groove portion is 0 to 20 mm, and a minimum width is 0 to 10 mm.   The synthetic resin container according to any one of claims 1 to 4, wherein the shoulder groove portions are provided at 4 to 10 at substantially equal intervals along the circumferential direction.   The ratio of the length along the container height direction of the shoulder vertical surface to the container height excluding the mouth part is 0.01 to 0.15. Synthetic resin container.   The synthetic resin according to any one of claims 1 to 6, wherein a ratio of a length of a linearly continuous portion of the side surface of the container to a height of the container excluding the mouth is 0.4 to 0.9. Made container.   The synthetic resin container according to any one of claims 1 to 7, wherein a ratio of a diameter of the body part to a container height excluding the mouth part is 0.4 to 0.7.

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