JP7432156B2 - plastic bottle - Google Patents

Description

TECHNICAL FIELD This disclosure relates to plastic bottles.

Conventionally, plastic bottles have been known that include a mouth portion having an external screw, a cover located below the external screw, a support ring located below the cover, and a body provided below the mouth. ing.

Such plastic bottles are conveyed while being held by horizontally arranged grippers. In this case, the gripper holds the support ring and the peripheral wall formed between the cover and the support ring in the mouth.

By the way, there is currently a demand for reducing the weight of plastic bottles, and for example, it is being considered to reduce the thickness of the peripheral wall formed between the cover and the support ring in the mouth of the plastic bottle (for example, as disclosed in patents (See Reference 1).

On the other hand, grippers that hold plastic bottles are installed in advance on plastic bottle molding lines and filling lines, and it is difficult to change the shape of the grippers in accordance with changes in the shape of plastic bottles.

Furthermore, conventionally, the cap that is attached to the mouth of a plastic bottle has a predetermined shape, and it is difficult to change the shape of the cap to match the shape of the mouth of the plastic bottle.

As described above, there are various restrictions when reducing the weight of the mouth of a plastic bottle. Therefore, there is a need to reduce the weight of the mouth of a plastic bottle without changing the existing equipment or the shape of the cap.

Japanese Patent Application Publication No. 2010-95269

The present disclosure has been made in consideration of these points, and an object of the present disclosure is to provide a plastic bottle whose overall weight can be reduced by reducing the weight of the mouth portion.

A plastic bottle according to one embodiment includes a mouth, a body, and a bottom, and the mouth includes a cylindrical part including an opening, and a support ring provided closer to the body than the cylindrical part. The support ring includes a notch portion cut out radially inward, and a protrusion portion adjacent to the notch portion in the circumferential direction, and the support ring has a volume of It is a plastic bottle whose volume is 70% or more and 95% or less of the volume of the support ring specified in the PCO1810 standard.

In the plastic bottle according to one embodiment, a plurality of cutouts may be provided along the circumferential direction.

In the plastic bottle according to one embodiment, the minimum outer diameter of the support ring at the notch may be 25.71 mm or more and 33 mm or less.

In the plastic bottle according to one embodiment, the outer edge of the protrusion may have a U-shape.

In the plastic bottle according to one embodiment, the outer edge of the protrusion may have a V-shape.

In the plastic bottle according to one embodiment, a first recess that is recessed upward from a lower surface of the support ring may be formed in the protrusion.

In the plastic bottle according to one embodiment, a second recessed portion recessed downward from the upper surface of the support ring may be formed in the protruding portion.

A plastic bottle according to one embodiment includes a mouth, a body, and a bottom, and the mouth includes a cylindrical part including an opening, and a support ring provided closer to the body than the cylindrical part. The support ring includes a thin wall portion that is thinned from the top side or the bottom side, and a thick wall portion adjacent to the thin wall portion in the circumferential direction, and the volume of the support ring is PCO1810. It is a plastic bottle whose volume is 70% or more and 95% or less of the support ring specified in the standard.

In the plastic bottle according to one embodiment, a plurality of the thin wall portions may be provided along the circumferential direction.

In the plastic bottle according to one embodiment, the outer edge of the thick portion may have a U-shape.

In the plastic bottle according to one embodiment, the outer edge of the thick portion may have a V-shape.

According to the present disclosure, the overall weight can be reduced by reducing the weight of the mouth portion.

FIG. 1 is a front view showing a plastic bottle according to a first embodiment. FIG. 2 is a perspective view showing the mouth of the plastic bottle according to the first embodiment from above. FIG. 3 is a perspective view showing the mouth of the plastic bottle according to the first embodiment from below. FIG. 4 is a bottom view showing the mouth of the plastic bottle according to the first embodiment. FIG. 5 is a sectional view (a sectional view obtained by vertically inverting the sectional view taken along the line V-V in FIG. 4) showing the mouth of the plastic bottle according to the first embodiment. FIG. 6 is a front view showing a preform for manufacturing a plastic bottle according to the first embodiment. FIG. 7 is a sectional view showing a method for manufacturing a plastic bottle according to the first embodiment. FIG. 8 is a cross-sectional view showing a method of manufacturing a plastic bottle according to the first embodiment. FIG. 9 is a perspective view showing the opening of the first modified example of the plastic bottle according to the first embodiment from above. FIG. 10 is a perspective view showing the opening of the first modified example of the plastic bottle according to the first embodiment from below. FIG. 11 is a bottom view showing the opening of the first modified example of the plastic bottle according to the first embodiment. FIG. 12 is a cross-sectional view (a cross-sectional view obtained by vertically inverting the cross-sectional view taken along line XII-XII in FIG. 11) showing the opening of a first modified example of the plastic bottle according to the first embodiment. FIG. 13 is a perspective view showing the opening of the second modified example of the plastic bottle according to the first embodiment from above. FIG. 14 is a bottom view showing the opening of the second modified example of the plastic bottle according to the first embodiment. FIG. 15 is a cross-sectional view (a cross-sectional view obtained by vertically inverting the cross-sectional view taken along line XV-XV in FIG. 14) showing the opening of a second modified example of the plastic bottle according to the first embodiment. FIG. 16 is a perspective view showing the opening of the third modified example of the plastic bottle according to the first embodiment from above. FIG. 17 is a perspective view showing the opening of the third modified example of the plastic bottle according to the first embodiment from below. FIG. 18 is a bottom view showing the opening of the third modified example of the plastic bottle according to the first embodiment. FIG. 19 is a cross-sectional view (a cross-sectional view obtained by vertically inverting the cross-sectional view taken along the line XIX-XIX in FIG. 18) showing the opening of the third modified example of the plastic bottle according to the first embodiment. FIG. 20 is a perspective view showing the opening of the fourth modification of the plastic bottle according to the first embodiment from above. FIG. 21 is a perspective view showing the opening of the fourth modified example of the plastic bottle according to the first embodiment from below. FIG. 22 is a bottom view showing the opening of the fourth modification of the plastic bottle according to the first embodiment. FIG. 23 is a sectional view (a sectional view obtained by vertically inverting the XXIII-XXIII sectional view of FIG. 22) showing the opening of the fourth modification of the plastic bottle according to the first embodiment. FIG. 24 is a perspective view showing the opening of the fifth modified example of the plastic bottle according to the first embodiment from above. FIG. 25 is a bottom view showing the opening of the fifth modification of the plastic bottle according to the first embodiment. FIG. 26 is a sectional view (a sectional view obtained by vertically inverting the XXVI-XXVI sectional view of FIG. 25) showing the opening of the fifth modified example of the plastic bottle according to the first embodiment. FIG. 27 is a perspective view showing the mouth of the plastic bottle according to the second embodiment from above. FIG. 28 is a perspective view showing the mouth of the plastic bottle according to the second embodiment from below. FIG. 29 is a bottom view showing the mouth of the plastic bottle according to the second embodiment. FIG. 30 is a cross-sectional view (a cross-sectional view obtained by vertically inverting the cross-sectional view taken along the line XXX-XXX in FIG. 29) showing the mouth of the plastic bottle according to the second embodiment. FIG. 31 is a perspective view showing the opening of the first modified example of the plastic bottle according to the second embodiment from above. FIG. 32 is a perspective view showing the opening of the first modified example of the plastic bottle according to the second embodiment from below. FIG. 33 is a bottom view showing the opening of the first modified example of the plastic bottle according to the second embodiment. FIG. 34 is a cross-sectional view (a cross-sectional view obtained by vertically inverting the cross-sectional view taken along the line XXXIV-XXXIV in FIG. 33) showing the opening of the first modified example of the plastic bottle according to the second embodiment. FIG. 35 is a perspective view showing the opening of a second modified example of the plastic bottle according to the second embodiment from above. FIG. 36 is a perspective view showing the opening of a second modified example of the plastic bottle according to the second embodiment from below. FIG. 37 is a bottom view showing the opening of a second modified example of the plastic bottle according to the second embodiment. FIG. 38 is a cross-sectional view (a cross-sectional view obtained by vertically inverting the cross-sectional view taken along the line XXXVIII-XXXVIII of FIG. 37) showing the opening of a second modified example of the plastic bottle according to the second embodiment. FIG. 39 is a perspective view showing the opening of the third modified example of the plastic bottle according to the second embodiment from above. FIG. 40 is a perspective view showing the opening of the third modified example of the plastic bottle according to the second embodiment from below. FIG. 41 is a bottom view showing the opening of the third modified example of the plastic bottle according to the second embodiment. FIG. 42 is a sectional view (a sectional view obtained by vertically inverting the XLII-XLII sectional view of FIG. 41) showing the opening of a third modified example of the plastic bottle according to the second embodiment. FIG. 43 is a diagram illustrating a strength measurement test in an example.

First Embodiment A first embodiment of the present disclosure will be described below with reference to the drawings. 1 to 8 are diagrams showing a first embodiment of the present disclosure. Each figure shown below is shown schematically. Therefore, the size and shape of each part are appropriately exaggerated to facilitate understanding. In addition, it is possible to implement the invention with appropriate changes within the scope of the technical concept. In each figure shown below, the same parts are given the same reference numerals, and some detailed explanations may be omitted. In addition, the numerical values such as the dimensions and material names of each member described in this specification are examples of embodiments, and are not limited to these, and can be appropriately selected and used. In this specification, terms specifying shapes and geometrical conditions, such as terms such as parallel, perpendicular, and perpendicular, are not only meant strictly, but also include substantially the same state.

plastic bottle

First, a plastic bottle 10 according to a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 5. In this specification, "upper" and "lower" respectively refer to the upper and lower parts of the plastic bottle 10 when it is erected (FIG. 1).

As shown in FIG. 1, the plastic bottle 10 includes a mouth 20, a neck 11 provided below the mouth 20, a shoulder 12 provided below the neck 11, and a neck 12 provided below the shoulder 12. It has a body part 13 and a bottom part 14 provided below the body part 13.

Among these, the mouth portion 20 has a cylindrical portion 22 including an opening 21 and a support ring 30 provided closer to the body portion 13 than the cylindrical portion 22 . In addition, in this specification, the "mouth part" refers to the part from the opening 21 to the lower surface of the support ring.

As shown in FIGS. 2 to 5, the cylindrical portion 22 of the mouth portion 20 includes an external threaded portion 23 into which a cap (not shown) is screwed, a cover 24 provided below the external threaded portion 23, and a cover 24. It includes a concave annular portion 25 provided between the support ring 30 and recessed inward in the radial direction.

The external threaded portion 23 of the cylindrical portion 22 is preferably a single thread, but may also be a double or triple thread. A vent slot 26 that extends along the vertical direction of the plastic bottle 10 is formed in this external threaded portion 23 . The vent slot 26 serves to release the internal pressure when the bottle is opened and prevent so-called cap popping when a carbonated beverage is used as the liquid content to be filled into the plastic bottle 10 or if the internal pressure increases due to spoilage of the liquid content. fulfill. Therefore, when using something that does not contain carbonic acid, such as water, as the content liquid, the vent slot 26 does not necessarily need to be provided.

The concave annular portion 25 has a cylindrical shape with a substantially uniform diameter as a whole. The outer diameter D1 (see FIG. 5) of the concave annular portion 25 is preferably 24 mm or more and 27 mm or less. By setting the outer diameter D1 of the concave annular portion 25 to 24 mm or more, the problem of the plastic bottle 10 falling from a gripper (not shown) is prevented when the plastic bottle 10 is transported in a molding line and a filling line for the plastic bottle 10. can do. Further, by setting the outer diameter D1 of the concave annular portion 25 to 27 mm or less, it is possible to prevent the weight of the plastic bottle 10 from increasing.

Next, the support ring 30 will be explained with reference to FIGS. 2 to 5. As shown in FIGS. 2 to 5, the support ring 30 includes a notch 31 that is cut out radially inward, and a protrusion 32 adjacent to the notch 31 in the circumferential direction. I'm here. The cutout portion 31 is a part of the outer region 34 of the support ring 30, which will be described later.

A plurality of notches 31 are provided along the circumferential direction. Further, a plurality of protrusions 32 are also provided along the circumferential direction. These notches 31 and protrusions 32 are arranged alternately along the circumferential direction. In this embodiment, eight notches 31 and eight protrusions 32 are provided. Furthermore, the notches 31 and the protrusions 32 are arranged at equal intervals along the circumferential direction. Thereby, when the plastic bottle 10 is transported in the molding line and the filling line of the plastic bottle 10, it is possible to suppress the transportability of the plastic bottle 10 from being deteriorated. Further, when attaching a cap (not shown) to the mouth portion 20, it is possible to suppress a large force from acting locally on the support ring 30, particularly on the protrusion portion 32. Therefore, it is possible to prevent the strength of the support ring 30 from decreasing, and it is possible to prevent the support ring 30 from being deformed when a cap (not shown) is attached to the mouth portion 20. Note that the number of notches 31 and protrusions 32 may each be seven or less, or may be nine or more.

The minimum value of the outer diameter D2 (see FIG. 4) of the support ring 30 at the notch 31 is preferably 25.71 mm or more and 33 mm or less. Since the minimum value of the outer diameter D2 of the support ring 30 at the notch portion 31 is 25.71 mm or more, as will be described later, when blow molding the plastic bottle 10, it is possible to prevent the moldability from being adversely affected. Can be suppressed. Moreover, since the minimum value of the outer diameter D2 is 33 mm or less, the amount of resin used in the mouth portion 20 can be reduced, and the weight of the mouth portion 20 can be reduced.

Further, the central angle θ1 (see FIG. 4) of the fan shape in which the outer edge of the support ring 30 forms an arc in the cutout portion 31 may be greater than or equal to 5° and less than or equal to 25°. By setting the central angle θ1 to 5° or more, the amount of resin used in the mouth portion 20 can be reduced, and the weight of the mouth portion 20 can be reduced. Moreover, since the central angle θ1 is 25° or less, it is possible to suppress the strength of the support ring 30 from decreasing.

Such cutout portions 31 may have the same shape or may have different shapes.

Next, the protrusion 32 will be explained. The outer edge 32a of the protrusion 32 has a U-shape. That is, the outer edge 32a of the protrusion 32 has a U-shape when viewed from the bottom (or when viewed from above). In this case, even if the outer diameter D3 (see FIG. 4) of the support ring 30 at the protrusion 32 is made constant and large over the entire circumference, the amount of the cutout in the outer region 34 of the support ring 30 (described later) is increased. can do. Thereby, the amount of resin used in the mouth portion 20 can be reduced, and the transportability of the plastic bottle 10 can be prevented from being deteriorated. In this specification, the U-shape refers to not only a strict U-shape but also a U-shape with rounded corners or a U-shape formed by continuously connecting multiple minute arcs. It also includes shapes that approximate the shape of a letter.

The outer diameter D3 (see FIG. 4) of the support ring 30 at the protrusion 32 is constant over the entire circumference. This outer diameter D3 may be within the range of the outer diameter of the support ring specified in the PCO1810 standard (that is, 33.00 mm±0.38 mm). This can prevent the plastic bottle 10 from falling from the gripper (not shown) when the plastic bottle 10 is transported in the plastic bottle 10 molding line and filling line. Note that the shape of the mouth portion 20 does not have to conform to the PCO1810 standard.

The width W1 (distance between the side surfaces 32b in bottom view, see FIG. 4) of the protrusion 32 is preferably 4.9 mm or more and 9.8 mm or less. By setting the width W1 of the protruding portion 32 to be 4.9 mm or more, it is possible to suppress the strength of the support ring 30 from decreasing. Further, since the width W1 of the protruding portion 32 is 9.8 mm or less, the amount of resin used in the mouth portion 20 can be reduced, and the weight of the mouth portion 20 can be reduced.

The protrusions 32 may have the same shape or may have different shapes.

Further, as shown in FIG. 5, the upper surface 30a (that is, the surface on the concave annular portion 25 side) of the support ring 30 has steps 33 and is formed in multiple stages. In this case, the support ring 30 is formed in two stages with one step 33, but the support ring 30 is not limited to this, and may have two or more steps 33. On the other hand, the lower surface 30b (the surface on the neck 11 (see FIG. 1) side) of the support ring 30 is a horizontal flat surface.

Further, the support ring 30 includes an outer region 34 located radially outward of the step 33 and an inner region 35 located radially inward of the step 33. Since the support ring 30 has the step 33 in this manner, the volume of the support ring 30 can be reduced by the step 33. Therefore, the weight of the support ring 30 can be reduced compared to the case where the step 33 is not provided. Note that, as described above, the cutout portion 31 is obtained by cutting out a part of the outer region 34 of the support ring 30. Therefore, the radial length of the outer region 34 in the notch 31 is shorter than the radial length L1 of the outer region 34 in the protrusion 32, which will be described later.

As shown in FIG. 5, the surface 34a of the outer region 34 of the support ring 30 is an inclined surface. In this case, when α is the angle between the surface 34a of the outer region 34 and the lower surface 30b of the support ring 30, it is preferable that 10°<α<16°. When the angle α exceeds 10°, the resin can be sufficiently spread to the tip of the support ring 30 when injection molding the preform 10a, and injection moldability can be improved. Further, by providing an angle, the thickness of the base can be ensured, and the strength of the support ring 30 is improved. Furthermore, since the angle α is less than 16°, it is possible to prevent the height of the concave annular portion 25 from becoming short, and to prevent transport defects from occurring when transporting the plastic bottle 10.

Further, the surface 35a of the inner region 35 of the support ring 30 is formed of an inclined surface. In this case, when β is the angle between the surface 35a of the inner region 35 and the lower surface 30b of the support ring 30, it is preferable that β>α. Further, it is preferable that the angle β satisfies 20°<β<60°. When the angle β exceeds 20°, injection moldability can be improved. Further, by providing an angle, the thickness of the base can be ensured, and the strength of the support ring 30 is improved. Furthermore, since the angle β is less than 60°, it is possible to prevent the height of the concave annular portion 25 from becoming short, and to prevent transport defects from occurring when the plastic bottle 10 is transported. Note that since the surface 35a of the inner region 35 is an inclined surface, there is a change point P where the outer diameter changes (a bent portion in a vertical cross-sectional view, 2 and 5) are formed. That is, in this specification, the "support ring" refers to a portion of the mouth located below the change point P.

Further, as shown in FIG. 5, when the radial length of the outer region 34 of the protrusion 32 is L1, and the radial length of the inner region 35 is L2, 1.5<L1/L2<4.0 It is preferable that the following relationship holds true. When the value of L1/L2 exceeds 1.5, it is possible to prevent the weight of the plastic bottle 10 from increasing. On the other hand, when the value of L1/L2 is less than 4.0, when injection molding the preform 10a, the resin can be sufficiently spread to the tip of the support ring 30, improving injection moldability. be able to.

Further, the thickness t1 at the tip of the support ring 30 (that is, the tip of the outer region 34 in the protrusion 32 in this embodiment) is preferably 1.0 mm or more and 1.5 mm or less. By setting the thickness t1 to 1.0 mm or more, the resin can be sufficiently spread to the tip of the support ring 30 when injection molding the preform 10a, and injection moldability can be improved. Further, by setting the thickness t1 to 1.5 mm or less, the height of the concave annular portion 25 can be prevented from becoming short, and transport defects when transporting the plastic bottle 10 can be prevented.

The volume of the support ring 30 is 70% or more and 95% or less of the volume of the support ring defined in the PCO1810 standard. When the volume of the support ring 30 is 70% or more of the volume of the support ring defined in the PCO1810 standard, it is possible to suppress the strength of the support ring 30 from decreasing. Furthermore, since the volume of the support ring 30 is 95% or less of the volume of the support ring specified in the PCO1810 standard, the amount of resin used in the mouth portion 20 can be reduced, and the weight of the mouth portion 20 can be reduced. be able to. Further, the volume of the support ring 30 is preferably 76% or more and 92% or less, and more preferably 76% or more and 87% or less, of the volume of the support ring defined in the PCO1810 standard. When the volume of the support ring 30 is 76% or more of the volume of the support ring defined in the PCO1810 standard, it is possible to effectively suppress the strength of the support ring 30 from decreasing. Furthermore, since the volume of the support ring 30 is 92% or less of the volume of the support ring specified in the PCO1810 standard, the amount of resin used in the mouth part 20 can be further reduced, and the mouth part 20 can be made even lighter. It is possible to aim for Further, since the volume of the support ring 30 is 87% or less of the volume of the support ring specified in the PCO1810 standard, the mouth portion 20 can be made lighter. Note that the volume of the support ring specified in the PCO1810 standard refers to the volume determined based on the median value of each dimension of the support ring specified in the PCO1810 standard. In this case, the volume of the support ring specified in the PCO1810 standard is 1169.26 mm ³ or more and 1241.56 mm ³ or less. Further, the volume of the mouth defined by the PCO1810 standard is 3666.07 mm ³ or more and 3892.78 mm ³ or less.

By the way, the shapes of the neck 11, shoulder 12, body 13, and bottom 14 of the plastic bottle 10 are not particularly limited, and may have various conventionally known shapes. Note that when a carbonated beverage is used as the content liquid to be filled into the plastic bottle 10, the bottom portion 14 may have a petaloid shape.

Further, the size (capacity) of the plastic bottle 10 is not limited and may be any size bottle, for example, it may be 100 ml or more and 3000 ml or less, preferably 500 ml or more and 600 ml or less. can do.

The main material of the plastic bottle 10 is preferably a thermoplastic resin, particularly PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), or PEN (polyethylene naphthalate), and plant-based biomass plastics. For example, it is also possible to use PLA (polylactic acid). Note that the plastic bottle 10 is preferably sterilized by adding hydrogen peroxide or peracetic acid.

Preform Next, the preform 10a according to this embodiment will be explained with reference to FIG. FIG. 6 is a diagram showing a preform 10a used when manufacturing the plastic bottle 10 shown in FIGS. 1 to 5.

As shown in FIG. 6, the preform 10a includes a mouth 20, a body 13a connected to the mouth 20, and a bottom 14a connected to the body 13a. Among these, the mouth 20 corresponds to the mouth 20 of the plastic bottle 10 described above, and the configuration of the mouth 20 is the same as the configuration of the mouth 20 of the plastic bottle 10 shown in FIGS. 1 to 5. . In FIG. 6, the same parts as those in the embodiment shown in FIGS. 1 to 5 are given the same reference numerals, and detailed description thereof will be omitted.

The body 13a corresponds to the neck 11, shoulder 12, and body 13 of the plastic bottle 10 described above. This body portion 13a has a large diameter portion 131 on the mouth portion 20a side, a reduced diameter portion 132 provided below the large diameter portion 131, and a small diameter portion 133 provided below the reduced diameter portion 132. ing.

Among these, the large diameter portion 131 is the portion with the largest outer diameter in the body portion 13a, and has a cylindrical shape with a substantially uniform outer diameter. The reduced diameter portion 132 has a shape in which the outer diameter gradually decreases downward. The small diameter portion 133 is the portion with the smallest outer diameter in the body portion 13a, and has a cylindrical shape with a substantially uniform outer diameter. Note that the body portion 13a may have a cylindrical shape having a substantially uniform diameter as a whole without having the large diameter portion 131, the reduced diameter portion 132, and the small diameter portion 133.

The bottom portion 14a corresponds to the bottom portion 14 of the plastic bottle 10 described above, and has a substantially hemispherical shape.

Next, the operation of this embodiment having such a configuration will be explained.

First, pellets made of thermoplastic resin such as PET (polyethylene terephthalate) are put into an injection molding machine (not shown), and the pellets are heated, melted, and pressurized by the injection molding machine.
The pellet is then turned into molten plastic and injected into an injection mold having an internal shape corresponding to preform 10a (see FIG. 6).

After a predetermined period of time has elapsed, the molten plastic hardens within the injection mold, forming the preform 10a. Thereafter, the injection mold is separated, and a preform 10a having a mouth 20 shown in FIG. 6 is taken out from within the injection mold. Note that when manufacturing the preform 10a, a preform having a mouth portion having a support ring specified in the PCO1810 standard is prepared, and then a notch 31 is formed in the support ring by cutting or the like. A preform 10a having a mouth portion 20 shown in FIG. 6 may be manufactured.

The preform 10a is then heated in a heating device (not shown) within the blow molding machine.
At this time, the preform 10a is conveyed within the heating device, and is heated uniformly in the circumferential direction by the heater while rotating around the central axis. During this time, the preform 10a is heated to a temperature of, for example, 80° C. or higher and 140° C. or lower. Thereafter, the heated preform 10a is sent to the blow molding section (see FIG. 7).

As shown in FIG. 7(a), the preform 10a sent to the blow molding section is inserted into the blow mold 100 of the blow molding section.

In this case, the blow mold 100 includes a mouth mold 101, a pair of body molds 102a and 102b that are separated from each other, and a bottom mold 103 (see FIG. 7(a)). Among these, the mouth mold 101 is a mold for holding the mouth part 20 of the preform 10a, and is also called a lip mold. The mouth mold 101 includes a packing 104 that comes into contact with the support ring 30 of the mouth 20 of the preform 10a and prevents air from a blow core 105 (described later) from leaking out of the mouth mold 101. There is. The inner surfaces of the pair of body molds 102a, 102b and the bottom mold 103 have shapes corresponding to the neck 11, shoulder 12, body 13, and bottom 14 of the plastic bottle 10. Note that a blow core 105 for press-fitting air into the preform 10a is fitted into the mouth portion 20 of the preform 10a.

When producing a plastic bottle 10 using such a blow molding die 100, as shown in FIG. Stretch blow molding is performed. In this way, the preform 10a is shaped into a shape corresponding to the inner surface of the blow mold 100, and the plastic bottle 10 is obtained from the preform 10a within the blow mold 100.

At this time, the minimum value of the outer diameter D2 (see FIG. 4) of the support ring 30 at the notch 31 is 25.71 mm or more. Thereby, as shown in FIG. 8, the packing 104 of the mouth mold 101 can come into contact with the support ring 30 over the entire circumference. Therefore, it is possible to suppress the formation of a gap between the packing 104 and the support ring 30 that communicates the inside and outside of the mouth mold 101. As a result, among the air A press-fitted into the preform 10a from the blow core 105, the air A1 leaked out from between the blow core 105 and the mouth 20 of the preform 10a to the outside of the mouth 20 is transferred to the mouth mold 101. leakage to the outside can be suppressed. Thereby, it is possible to suppress the air A1 leaking to the outside of the mouth portion 20 from entering the space S between the preform 10a and the pair of body molds 102a and 102b. Therefore, when blow molding the plastic bottle 10, it is possible to prevent the moldability from being adversely affected.

Next, the plastic bottle 10 molded on the blow molding line is transported from the blow molding section into a filling machine (not shown) by air transport means or neck transport means. Thereafter, the contents of the plastic bottle 10 are filled in the filling machine, and then a cap (not shown) is attached to the plastic bottle 10 using a capper. At this time, the plastic bottle 10 is supported on the lower surface 30b of the support ring 30, and the cap is attached so as to cover the mouth part 20.

As described above, according to the present embodiment, the support ring 30 has a notch 31 cut out radially inward and a protrusion adjacent to the notch 31 in the circumferential direction. 32. Further, the volume of the support ring 30 is 70% or more and 95% or less of the volume of the support ring defined in the PCO1810 standard. In this way, since the volume of the support ring 30 is 70% or more of the volume of the support ring defined in the PCO1810 standard, it is possible to suppress the strength of the support ring 30 from decreasing. Furthermore, since the volume of the support ring 30 is 95% or less of the volume of the support ring specified in the PCO1810 standard, the amount of resin used in the mouth portion 20 can be reduced, and the weight of the mouth portion 20 can be reduced. be able to. Note that the fact that the weight of the mouth portion 20 can be reduced and that the strength of the support ring 30 can be prevented from decreasing will be explained in the examples described later.

Further, according to the present embodiment, a plurality of notches 31 are provided along the circumferential direction. Thereby, the amount of resin used in the mouth portion 20 can be easily reduced, and the mouth portion 20 can be easily reduced in weight.

Furthermore, according to this embodiment, the outer edge 32a of the protrusion 32 has a U-shape. In this case, even if the outer diameter D3 of the support ring 30 at the protrusion 32 is made constant and large over the entire circumference, the amount of the cutout in the outer region 34 of the support ring 30 can be increased. Thereby, the amount of resin used in the mouth portion 20 can be reduced, and the transportability of the plastic bottle 10 can be prevented from being deteriorated.

Modifications Next, modifications of the plastic bottle 10 according to the first embodiment will be described with reference to FIGS. 9 to 26. In FIGS. 9 to 26, the same parts as those in the first embodiment shown in FIGS. 1 to 8 are given the same reference numerals, and detailed explanations are omitted. Moreover, in FIGS. 9 to 26, illustrations of the plastic bottle 10 other than the mouth portion 20 are omitted.

(First modification)
9 to 12 show a mouth portion 20 of a plastic bottle 10 according to a first modification. 9 to 12, a first recess 36 is formed in the protrusion 32 and is recessed upward from the lower surface 30b of the support ring 30. As shown in FIGS. In this case, the amount of resin used in the mouth portion 20 can be further reduced, and the mouth portion 20 can be further reduced in weight. In this embodiment, one first recess 36 is formed in each protrusion 32 .

Each of the first recesses 36 has a substantially rectangular shape when viewed from the bottom. Further, the first recess 36 may be formed radially inward than the protrusion 32. In the illustrated example, the first recess 36 is formed so as to span the outer region 34 and the inner region 35 (see FIG. 12). In this case, the amount of resin used in the mouth portion 20 can be further reduced.

The depth of the first recess 36 may be substantially constant as a whole. In this case, the depth d1 (see FIG. 12) of the first recess 36 may be 0.1 mm or more and 0.8 mm or less. When the depth d1 is 0.1 mm or more, the amount of resin used in the mouth portion 20 can be reduced, and the weight of the mouth portion 20 can be reduced. Moreover, since the depth d1 is 0.8 mm or less, it is possible to suppress the strength of the support ring 30 from decreasing.

(Second modification)
13 to 15 show a mouth portion 20 of a plastic bottle 10 according to a second modification. 13 to 15, a second recess 37 is formed in the protrusion 32 and is recessed downward from the upper surface 30a of the support ring 30. As shown in FIGS. Also in this case, the amount of resin used in the mouth portion 20 can be further reduced, and the mouth portion 20 can be further reduced in weight. In this embodiment, one second recess 37 is formed in each protrusion 32 .

Each of the second recesses 37 has a substantially rectangular shape in plan view. Further, the lower surface 37a of the second recess 37 is a horizontal flat surface. As described above, since the surface 34a of the outer region 34 is an inclined surface, the depth of the second recess 37 gradually becomes deeper as it goes radially inward. In this case, the depth d2 (see FIG. 15) of the deepest part of the second recess 37 may be 0.1 mm or more and 0.8 mm or less. By setting the depth d2 to 0.1 mm or more, the amount of resin used in the mouth portion 20 can be reduced, and the weight of the mouth portion 20 can be reduced. Moreover, since the depth d2 is 0.8 mm or less, it is possible to suppress the strength of the support ring 30 from decreasing.

(Third modification)
16 to 19 show a mouth portion 20 of a plastic bottle 10 according to a third modification. In FIGS. 16 to 19, the outer edge 32a of the protrusion 32 has a V-shape. That is, the outer edge 32a of the protrusion 32 has a V-shape when viewed from the bottom (or when viewed from above). In this case, the protrusion 32 is formed such that the V-shaped tip faces radially outward, and the width of the protrusion 32 (the center O between the V-shaped tip and the mouth 20 (Fig. The length along the direction perpendicular to the straight line Thereby, it is possible to suppress a large force from acting locally on the base of the protrusion 32. Therefore, it is possible to prevent the strength of the support ring 30 from decreasing, and it is possible to prevent the support ring 30 from being deformed when a cap (not shown) is attached to the mouth portion 20. In addition, in this specification, the V-shape includes not only a strict V-shape but also a shape in which the tip of the V-shape is rounded, a shape in which the tip of the V-shape is cut into a straight line, or It also includes a shape that approximates a V-shape by continuously connecting a plurality of minute circular arcs.

In this modification, the width W2 (see FIG. 18) of the widest portion of the protrusion 32 is preferably 12 mm or more and 17 mm or less. By setting the width W2 of the protruding portion 32 to be 12 mm or more, it is possible to suppress the strength of the support ring 30 from decreasing. Further, since the width W2 of the protruding portion 32 is 17 mm or less, the amount of resin used in the mouth portion 20 can be reduced, and the weight of the mouth portion 20 can be reduced.

Further, the maximum value of the outer diameter D4 (see FIG. 18) of the support ring 30 in the protrusion 32 may be equal to the outer diameter of the support ring specified in the PCO1810 standard. This can prevent the plastic bottle 10 from falling from the gripper (not shown) when the plastic bottle 10 is transported in the plastic bottle 10 molding line and filling line.

(Fourth modification)
20 to 23 show a mouth portion 20 of a plastic bottle 10 according to a fourth modification. 20 to 23, a first recess 36 is formed in the protrusion 32 and is recessed upward from the lower surface 30b of the support ring 30. As shown in FIGS. Further, similarly to the third modification shown in FIGS. 16 to 19, the outer edge 32a of the protrusion 32 has a V-shape. Also in this modification, by forming the first recessed portion 36 that is recessed upward from the lower surface 30b of the support ring 30, the amount of resin used in the mouth portion 20 can be further reduced, and the amount of resin used in the mouth portion 20 can be further reduced. It is possible to achieve weight reduction. In this embodiment, one first recess 36 is formed in each protrusion 32 .

Each of the first recesses 36 has a triangular shape when viewed from the bottom. Further, the first recess 36 may be formed radially inward than the protrusion 32. In the illustrated example, the first recess 36 is formed so as to span the outer region 34 and the inner region 35 (see FIG. 23). In this case, the amount of resin used in the mouth portion 20 can be further reduced.

The depth of the first recess 36 may be substantially constant as a whole. In this case, the depth of the first recess 36 may be approximately the same as the depth d1 (see FIG. 12) of the first recess 36 in the first modification.

(Fifth modification)
24 to 26 show a mouth portion 20 of a plastic bottle 10 according to a fifth modification. 24 to 26, a second recess 37 is formed in the protrusion 32 and is recessed downward from the upper surface 30a of the support ring 30. As shown in FIGS. Further, similarly to the third modification shown in FIGS. 16 to 19, the outer edge 32a of the protrusion 32 has a V-shape. Also in this modification, by forming the second recess 37 that is recessed downward from the upper surface 30a of the support ring 30, the amount of resin used in the mouth 20 can be further reduced, and the amount of resin used in the mouth 20 can be further reduced. It is possible to achieve weight reduction. In this embodiment, one second recess 37 is formed in each protrusion 32 .

Each of the second recesses 37 has a triangular shape in plan view. Further, the lower surface 37a of the second recess 37 is a horizontal flat surface. As described above, since the surface 34a of the outer region 34 is an inclined surface, the depth of the second recess 37 gradually becomes deeper as it goes radially inward. In this case, the depth of the deepest portion of the second recess 37 may be approximately the same as the depth d2 of the second recess 37 in the second modification (see FIG. 15).

Second Embodiment Next, a second embodiment will be described with reference to FIGS. 27 to 30. In the second embodiment shown in FIGS. 27 to 30, the support ring mainly includes a thin portion that is thinned from the upper surface side and a thick portion that is adjacent to the thin portion in the circumferential direction. This embodiment differs from the first embodiment in this point. In FIGS. 27 to 30, the same parts as in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Further, in FIGS. 27 to 30, illustrations of the plastic bottle other than the mouth portion are omitted.

As shown in FIGS. 27 to 30, the mouth portion 20A of the plastic bottle 10A according to the present embodiment includes a cylindrical portion 22 including an opening 21, and a support ring 30A provided closer to the body portion 13 than the cylindrical portion 22. It has Among these, the configuration of the cylindrical portion 22 is the same as that in the first embodiment described above, so detailed explanation will be omitted here.

The support ring 30A includes a thin portion 38 that is thinned from the top surface 30a side, and a thick portion 39 adjacent to the thin portion 38 in the circumferential direction. Among these, the thin wall portion 38 is obtained by thinning a part of the outer region 34 of the support ring 30A. In this case, the lower surface 30b of this support ring 30A is a horizontal, annular flat surface, similar to the conventional support ring. Thereby, when transporting the plastic bottle 10A in the molding line and the filling line of the plastic bottle 10A, it is possible to suppress the transportability of the plastic bottle 10A from decreasing.

A plurality of thin portions 38 are provided along the circumferential direction. Further, a plurality of thick portions 39 are also provided along the circumferential direction. These thin portions 38 and thick portions 39 are alternately arranged along the circumferential direction. In this case, the outer edge of the support ring 30 is defined by thin portions 38 and thick portions 39 that are alternately arranged along the circumferential direction. That is, the thin portion 38 is provided so as to reach the tip of the support ring 30 (that is, the tip of the outer region 34 in this embodiment).

In this embodiment, eight thin portions 38 and eight thick portions 39 are provided. Further, the thin portions 38 and the thick portions 39 are arranged at equal intervals along the circumferential direction. Thereby, when attaching a cap (not shown) to the mouth portion 20A, it is possible to suppress a large force from acting locally on the support ring 30A. Therefore, it is possible to prevent the strength of the support ring 30A from decreasing, and it is possible to prevent the support ring 30A from being deformed when a cap (not shown) is attached to the mouth portion 20A. Note that the numbers of the thin-walled portions 38 and the thick-walled portions 39 may each be seven or less, or each may be nine or more.

The minimum value of the inner diameter D5 (see FIG. 29) of the thin portion 38 is preferably 25.71 mm or more and 33 mm or less. By setting the minimum value of the inner diameter D5 of the thin portion 38 to 25.71 mm or more, it is possible to suppress the strength of the support ring 30A from decreasing. Moreover, since the minimum value of the inner diameter D5 is 33 mm or less, the amount of resin used in the mouth portion 20A can be reduced, and the weight of the mouth portion 20A can be reduced.

Further, the central angle θ2 (see FIG. 29) of the fan shape in which the inner edge of the thin portion 38 constitutes an arc may be 5° or more and 25° or less. By setting the central angle θ2 to 5° or more, the amount of resin used in the mouth portion 20A can be reduced, and the weight of the mouth portion 20A can be reduced. Moreover, since the central angle θ2 is 25° or less, it is possible to suppress the strength of the support ring 30A from decreasing.

The thickness of the thin portion 38 may be substantially constant as a whole. In this case, the thickness t2 (see FIG. 30) of the thin portion 38 is preferably 0.79 mm or more and 1.18 mm or less. By setting the thickness t2 of the thin portion 38 to 0.79 mm or more, it is possible to suppress the strength of the support ring 30A from decreasing. Further, since the thickness t2 of the thin portion 38 is 1.18 mm or more, the amount of resin used in the mouth portion 20A can be reduced, and the weight of the mouth portion 20A can be reduced.

Such thin portions 38 may have the same shape or may have different shapes.

Next, the thick portion 39 will be explained. The outer edge 39a of the thick portion 39 has a U-shape. That is, the outer edge 39a of the thick portion 39 has a U-shape in plan view. In this case, even if the outer diameter of the support ring 30A in the thick portion 39 is made constant and large over the entire circumference, the amount by which the outer region 34 of the support ring 30A is thinned can be increased. Thereby, the amount of resin used in the mouth portion 20A can be reduced, and it is possible to prevent the transportability of the plastic bottle 10A from decreasing.

The rest of the configuration of the thick portion 39 is the same as the configuration of the protruding portion 32 according to the first embodiment described above, so detailed description thereof will be omitted here.

Also in this embodiment, the volume of the support ring 30A is 70% or more and 95% or less of the volume of the support ring defined in the PCO1810 standard. Since the volume of the support ring 30A is 70% or more of the volume of the support ring defined in the PCO1810 standard, it is possible to suppress the strength of the support ring 30A from decreasing. Furthermore, since the volume of the support ring 30A is 95% or less of the volume of the support ring specified in the PCO1810 standard, the amount of resin used in the mouth portion 20A can be reduced, and the weight of the mouth portion 20A can be reduced. be able to. Also in this embodiment, the volume of the support ring 30A is preferably 76% or more and 92% or less of the volume of the support ring specified in the PCO1810 standard, and more preferably 86% or more and 92% or less. preferable. When the volume of the support ring 30A is 76% or more of the volume of the support ring specified in the PCO1810 standard, it is possible to effectively suppress the strength of the support ring 30A from decreasing. Further, since the volume of the support ring 30A is 86% or more of the volume of the support ring defined in the PCO1810 standard, it is possible to more effectively suppress the strength of the support ring 30A from decreasing. In addition, since the volume of the support ring 30A is 92% or less of the volume of the support ring specified in the PCO1810 standard, the amount of resin used in the mouth portion 20A can be further reduced, and the mouth portion 20A can be made even lighter. It is possible to aim for

As described above, according to the present embodiment, the support ring 30A includes the thin wall portion 38 that is thinned from the top surface 30a side, and the thick wall portion 39 adjacent to the thin wall portion 38 in the circumferential direction. I'm here. Further, the volume of the support ring 30A is 70% or more and 95% or less of the volume of the support ring defined in the PCO1810 standard. In this way, since the volume of the support ring 30A is 70% or more of the volume of the support ring specified in the PCO1810 standard, it is possible to suppress the strength of the support ring 30A from decreasing. Furthermore, since the volume of the support ring 30A is 95% or less of the volume of the support ring specified in the PCO1810 standard, the amount of resin used in the mouth portion 20A can be reduced, and the weight of the mouth portion 20A can be reduced. be able to. Note that the fact that it is possible to reduce the weight of the mouth portion 20A and to suppress a decrease in the strength of the support ring 30A will be explained with reference to Examples described later.

Further, according to the present embodiment, a plurality of thin portions 38 are provided along the circumferential direction. Thereby, the amount of resin used in the mouth portion 20A can be easily reduced, and the mouth portion 20 can be easily reduced in weight.

Further, according to this embodiment, the outer edge 39a of the thick portion 39 has a U-shape. In this case, even if the outer diameter of the support ring 30A in the thick portion 39 is made constant and large over the entire circumference, the amount by which the outer region 34 of the support ring 30A is thinned can be increased. Thereby, it is possible to reduce the amount of resin used in the mouth portion 20A, and it is also possible to prevent the transportability of the plastic bottle 10A from decreasing.

Modifications Next, modifications of the plastic bottle 10A according to the second embodiment will be described with reference to FIGS. 31 to 42. 31 to 42, the first embodiment shown in FIGS. 1 to 8, each modification of the first embodiment shown in FIGS. 9 to 26, or the second embodiment shown in FIGS. 27 to 30 The same parts as in the form will be given the same reference numerals and detailed explanations will be omitted. Moreover, in FIGS. 31 to 42, illustrations of the plastic bottle 10A other than the mouth portion 20A are omitted.

(First modification)
31 to 34 show a mouth portion 20A of a plastic bottle 10A according to a first modification. In FIGS. 31 to 34, the support ring 30A includes a thinned portion 38 that is thinned from the lower surface 30b side. Also in this modification, since the support ring 30A includes the thin-walled portion 38 that is thinned from the lower surface 30b side, the amount of resin used in the mouth portion 20A can be easily reduced. It can be easily reduced in weight.

The lower surface 38a of this thin portion 38 is a horizontal flat surface. As described above, since the surface 34a of the outer region 34 is an inclined surface, the thickness of the thin portion 38 gradually increases as it goes radially inward. In this case, the thickness t3 (see FIG. 34) of the thickest portion of the thin portion 38 may be 0.79 mm or more and 1.18 mm or less. When the thickness t3 is 0.79 mm or more, it is possible to prevent the strength of the support ring 30A from decreasing. Further, by setting the thickness t3 to 1.18 mm or less, the amount of resin used in the mouth portion 20A can be reduced, and the weight of the mouth portion 20A can be reduced.

(Second modification)
35 to 38 show a mouth portion 20A of a plastic bottle 10A according to a second modification. In FIGS. 35 to 38, the outer edge 39a of the thick portion 39 has a V-shape. That is, the outer edge 39a of the thick portion 39 has a V-shape in plan view. In this case, the width (length along the circumferential direction) of the thick portion 39 gradually increases toward the inside in the radial direction. Thereby, it is possible to suppress a large force from acting locally on the root of the thick portion 39. Therefore, it is possible to prevent the strength of the support ring 30A from decreasing, and it is possible to prevent the support ring 30A from being deformed when a cap (not shown) is attached to the mouth portion 20A.

Further, in this modification as well, the lower surface 30b of the support ring 30A is a horizontal and annular flat surface, similar to the second embodiment described above. Thereby, when transporting the plastic bottle 10A in the molding line and the filling line of the plastic bottle 10A, it is possible to suppress the transportability of the plastic bottle 10A from decreasing.

The other configurations of the thick portion 39 are the same as the configuration of the protruding portion 32 according to the third modification of the first embodiment described above, so detailed description thereof will be omitted here.

(Third modification)
39 to 42 show a mouth portion 20A of a plastic bottle 10A according to a third modification. In FIGS. 39 to 42, the support ring 30A includes a thinned portion 38 that is thinned from the lower surface 30b side. Further, similarly to the second modification shown in FIGS. 35 to 38, the outer edge 39a of the thick portion 39 has a V-shape. Also in this modification, since the support ring 30A includes the thin wall portion 38 that is thinned from the lower surface 30b side, the amount of resin used in the mouth portion 20A can be easily reduced, and the mouth portion 20A can be easily formed. It can be made lighter.

(Example)
Next, a specific example of this embodiment will be described.

(Example 1)
A preform was produced by injection molding, and this preform was blow molded to obtain a plastic bottle 10 (Example 1) shown in FIG. In this plastic bottle 10 (Example 1), the volume of the mouth portion 20 was 3190.08 mm ³ and the volume of the support ring 30 was 949.32 mm ³ . Further, the volume ratio of the support ring 30 to the support ring specified in the PCO1810 standard was 81.2%.

(Strength measurement test)
Next, as shown in FIG. 43, the support ring 30 of the obtained plastic bottle 10 was supported from below by the support member 110, and the mouth portion 20 was pressed from above. Then, the load F (N) when the support ring 30 was deformed was measured.

(Example 2)
A plastic bottle 10 (Example 2) was manufactured in the same manner as in Example 1, except that the opening 20 of the plastic bottle 10 was the opening 20 shown in FIGS. 9 to 12, and a strength measurement test was conducted. went. In this plastic bottle 10 (Example 2), the volume of the mouth portion 20 was 3133.83 mm ³ and the volume of the support ring 30 was 893.07 mm ³ . Further, the volume ratio of the support ring 30 to the support ring specified in the PCO1810 standard was 76.4%. In addition, in the strength measurement test, when the support ring 30 of the plastic bottle 10 is supported from below by the support member 110 and the mouth part 20 is pressed from above, the load F (N) when the support ring 30 is deformed is simulated. Calculated by.

(Example 3)
A plastic bottle 10 (Example 3) was produced in the same manner as in Example 1, except that the mouth part 20 of the plastic bottle 10 was the mouth part 20 shown in FIGS. 13 to 15, and a strength measurement test was conducted. went. In this plastic bottle 10 (Example 3), the volume of the mouth portion 20 was 3162.80 mm ³ and the volume of the support ring 30 was 922.04 mm ³ . Further, the volume ratio of the support ring 30 to the support ring specified in the PCO1810 standard was 78.9%. In addition, in the strength measurement test, when the support ring 30 of the plastic bottle 10 is supported from below by the support member 110 and the mouth part 20 is pressed from above, the load F (N) when the support ring 30 is deformed is simulated. Calculated by.

(Example 4)
A plastic bottle 10 (Example 4) was produced in the same manner as in Example 1, except that the mouth part 20 of the plastic bottle 10 was the mouth part 20 shown in FIGS. 16 to 19, and a strength measurement test was conducted. went. In this plastic bottle 10 (Example 4), the volume of the mouth portion 20 was 3254.78 mm ³ and the volume of the support ring 30 was 1014.02 mm ³ . Further, the volume ratio of the support ring 30 to the support ring specified in the PCO1810 standard was 86.7%.

(Example 5)
A plastic bottle 10 (Example 5) was manufactured in the same manner as in Example 1, except that the opening 20 of the plastic bottle 10 was the opening 20 shown in FIGS. 20 to 23, and a strength measurement test was conducted. went. In this plastic bottle 10 (Example 5), the volume of the mouth portion 20 was 3182.73 mm ³ and the volume of the support ring 30 was 941.97 mm ³ . Further, the volume ratio of the support ring 30 to the support ring specified in the PCO1810 standard was 80.6%. In addition, in the strength measurement test, when the support ring 30 of the plastic bottle 10 is supported from below by the support member 110 and the mouth part 20 is pressed from above, the load F (N) when the support ring 30 is deformed is simulated. Calculated by.

(Example 6)
A plastic bottle 10 (Example 6) was produced in the same manner as in Example 1, except that the mouth part 20 of the plastic bottle 10 was the mouth part 20 shown in FIGS. 24 to 26, and a strength measurement test was conducted. went. In this plastic bottle 10 (Example 6), the volume of the mouth portion 20 was 3230.02 mm ³ and the volume of the support ring 30 was 989.26 mm ³ . Further, the volume ratio of the support ring 30 to the support ring specified in the PCO1810 standard was 84.6%. In addition, in the strength measurement test, when the support ring 30 of the plastic bottle 10 is supported from below by the support member 110 and the mouth part 20 is pressed from above, the load F (N) when the support ring 30 is deformed is simulated. Calculated by.

(Example 7)
A plastic bottle 10A (Example 7) was produced in the same manner as in Example 1, except that the mouth 20A of the plastic bottle 10A was the mouth 20A shown in FIGS. 27 to 30, and a strength measurement test was conducted. went. In this plastic bottle 10A (Example 7), the volume of the mouth portion 20A was 3251.20 mm ³ and the volume of the support ring 30A was 1010.44 mm ³ . Further, the volume ratio of the support ring 30A to the support ring specified in the PCO1810 standard was 86.4%. In addition, in the strength measurement test, when the support ring 30A of the plastic bottle 10A is supported from below by the support member 110 and the mouth 20A is pressed from above, the load F (N) when the support ring 30A is deformed is simulated. Calculated by.

(Example 8)
A plastic bottle 10A (Example 8) was manufactured in the same manner as in Example 1, except that the opening 20A of the plastic bottle 10A was the opening 20A shown in FIGS. 31 to 34, and a strength measurement test was conducted. went. In this plastic bottle 10A (Example 8), the volume of the mouth portion 20A was 3296.00 mm ³ and the volume of the support ring 30A was 1055.24 mm ³ . Further, the volume ratio of the support ring 30A to the support ring specified in the PCO1810 standard was 90.2%. In addition, in the strength measurement test, when the support ring 30A of the plastic bottle 10A is supported from below by the support member 110 and the mouth 20A is pressed from above, the load F (N) when the support ring 30A is deformed is simulated. Calculated by.

(Example 9)
A plastic bottle 10A (Example 9) was produced in the same manner as in Example 1, except that the mouth 20A of the plastic bottle 10A was the mouth 20A shown in FIGS. 35 to 38, and a strength measurement test was conducted. went. In this plastic bottle 10A (Example 9), the volume of the mouth portion 20A was 3293.90 mm ³ and the volume of the support ring 30A was 1053.14 mm ³ . Further, the volume ratio of the support ring 30A to the support ring specified in the PCO1810 standard was 90.1%. In addition, in the strength measurement test, when the support ring 30A of the plastic bottle 10A is supported from below by the support member 110 and the mouth 20A is pressed from above, the load F (N) when the support ring 30A is deformed is simulated. Calculated by.

(Example 10)
A plastic bottle 10A (Example 10) was manufactured in the same manner as in Example 1, except that the opening 20A of the plastic bottle 10A was the opening 20A shown in FIGS. 39 to 42, and a strength measurement test was conducted. went. In this plastic bottle 10A (Example 10), the volume of the mouth portion 20A was 3316.00 mm ³ and the volume of the support ring 30A was 1075.24 mm ³ . Further, the volume ratio of the support ring 30A to the support ring specified in the PCO1810 standard was 92.0%. In addition, in the strength measurement test, when the support ring 30A of the plastic bottle 10A is supported from below by the support member 110 and the mouth 20A is pressed from above, the load F (N) when the support ring 30A is deformed is simulated. Calculated by.

(Comparative example)
A plastic bottle (comparative example) was produced in the same manner as in Example 1, except that the mouth of the plastic bottle was a mouth defined by the PCO1810 Lite standard, and a strength measurement test was conducted. In this plastic bottle (comparative example), the volume of the mouth was 3355.11 mm ³ and the volume of the support ring was 1114.35 mm ³ . Further, the volume ratio of the support ring to the support ring specified in the PCO1810 standard was 95.3%.

The above results are summarized in Table 1. In Table 1, the evaluation result "○" indicates that the load when the support ring was deformed was 2940N or more.

As a result, as shown in Table 1, even in the plastic bottles 10 and 10A of Examples 1 to 10, in which the amount of resin used for the mouth parts 20 and 20A was reduced, the support ring 30 and The load when 30A was deformed was more than a predetermined value.

In this way, the plastic bottles 10 and 10A according to Examples 1 to 10 have the support ring 30 even when the amount of resin used for the mouth parts 20 and 20A is reduced compared to the plastic bottles according to the comparative example. , 30A can be suppressed from decreasing in strength.

It is also possible to combine the plurality of components disclosed in each of the above embodiments and modifications as appropriate. Alternatively, some components may be deleted from all the components shown in each of the above embodiments and modifications.

10 Plastic bottle 10A Plastic bottle 13 Body 14 Bottom 20 Mouth 20A Mouth 21 Opening 22 Cylinder 30 Support ring 30A Support ring 30a Top surface 30b Bottom surface 31 Notch 32 Projection 32a Outer edge 36 First recess 37 Second recess 38 Thin wall portion 39 Thick wall portion 39a Outer edge

Claims (11)

Comprising a mouth, a body, and a bottom,
The mouth part is
a cylindrical portion including an opening;
and a support ring provided closer to the body than the cylinder,
The support ring is
A notch portion cut out radially inward,
a protrusion adjacent to the notch in the circumferential direction;
The volume of the support ring is 70% or more and 95% or less of the volume of the support ring specified in the PCO1810 standard. The plastic bottle according to claim 1, wherein a plurality of said notches are provided along the circumferential direction. The plastic bottle according to claim 1 or 2, wherein a minimum value of the outer diameter of the support ring at the notch is 25.71 mm or more and 33 mm or less. The plastic bottle according to any one of claims 1 to 3, wherein the outer edge of the protrusion has a U-shape. The plastic bottle according to any one of claims 1 to 3, wherein the outer edge of the protrusion has a V-shape. The plastic bottle according to any one of claims 1 to 5, wherein the protrusion has a first recess that is recessed upward from the lower surface of the support ring. The plastic bottle according to any one of claims 1 to 6, wherein the protrusion has a second recess that is recessed downward from the upper surface of the support ring. Comprising a mouth, a body, and a bottom,
The mouth part is
a cylindrical portion including an opening;
and a support ring provided closer to the body than the cylinder,
The support ring is
A thin wall portion that is thinned from the top side or the bottom side;
a thick wall portion adjacent to the thin wall portion in the circumferential direction;
The volume of the support ring is 70% or more and 95% or less of the volume of the support ring specified in the PCO1810 standard. 9. The plastic bottle according to claim 8, wherein a plurality of said thin portions are provided along the circumferential direction. The plastic bottle according to claim 8 or 9, wherein the outer edge of the thick portion has a U-shape. The plastic bottle according to claim 8 or 9, wherein the outer edge of the thick portion has a V-shape.