Liquid container

Abstract

To provide a liquid container that can suppress the outflow of liquid in a pulsating state even when it is nearly full, when the liquid is discharged from the drinking mouth of the spout.SOLUTION: In a PET bottle 1, where a shoulder part 4 is continuous from the upper end of a body part 3, a neck part 5 is continuous from the shoulder part 4, a mouth part 6 having a drinking port 7 is continuous at the upper end of the neck part 5, and a cap 11 is screwed into the outer periphery of the mouth 6, a series of inner peripheral surfaces 100 are formed into a substantially truncated conical shape from the shoulder part 4 at the upper end of the body part 3 to the upper ends of the neck part 5, the mouth part 6, and the drinking port 7, and a male thread 10 that screws into the female thread 12 of the cap 11 is formed on the outer peripheral surface 200 of the mouth part 6.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a liquid container. [Background technology]

[0002] Patent Document 1 discloses a liquid container having a neck connected to the upper end (shoulder) of a body, a mouth with a drinking spout connected to the upper end of the neck, and a cap screwed onto the outer periphery of the mouth. The liquid container is a container for storing, for example, juice, coffee drinks, alcoholic drinks, seasonings, etc., and may be a plastic bottle, aluminum can, steel can, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-104094 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, when tilting a liquid container to allow liquid to flow from the spout, if the container is nearly full, the spout becomes blocked by the liquid, and the air inside the container causes the liquid to flow in a pulsating manner. This causes problems such as difficulty in drinking the liquid from the spout, difficulty in accurately pouring small amounts of liquid into a cup, and the liquid splashing and spilling onto the table or staining clothes.

[0005] The present invention aims to solve the above-mentioned conventional problems and provide a liquid container that can prevent liquid from flowing in a pulsating state when liquid is flowed out from the drinking spout of the mouth, even when the container is nearly full. [Means for solving the problem]

[0006] The liquid container of the present invention has a shoulder portion continuous with the upper end of the body portion, a neck portion continuous with the shoulder portion, a mouth portion continuous with the upper end of the neck portion, the mouth portion having a drinking spout, and a cap screwed onto the outer periphery of the mouth portion, in which the inner circumferential surface from the shoulder portion at the upper end of the body portion to the neck portion, the mouth portion and the upper end of the drinking spout is formed into an approximately truncated cone shape, and a male thread is formed on the outer circumferential surface of the mouth portion to screw into the female thread of the cap. [Effects of the Invention]

[0007] In the present invention, it is possible to prevent the liquid from flowing out in a pulsating state. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a side view of the liquid container according to the first embodiment. [Figure 2] 2 is an enlarged cross-sectional view showing the body, shoulder, neck and mouth of the liquid container. FIG. [Figure 3] 1A to 1C are conceptual diagrams illustrating the operation. [Figure 4] FIG. 10 is a side view of a liquid container according to a second embodiment. [Figure 5] FIG. 5 is a cross-sectional view of FIG. 4 . [Figure 6] 5 is a cross-sectional view corresponding to VV in FIG. 4, showing a modified example. [Figure 7] FIG. 10 is a side view of a liquid container according to a third embodiment. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] FIG. 8 is a cross-sectional view corresponding to the line VIII-VIII in FIG. 7, showing a modified example. [Figure 10] FIG. 10 is a view corresponding to FIG. 2 according to a fourth embodiment. [Figure 11] FIG. 10 is a view corresponding to FIG. 2 according to a fifth embodiment. [Figure 12] FIG. 13 is a side view of a liquid container according to a sixth embodiment. [Figure 13] FIG. 10 is a side view of a liquid container showing a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present invention will be described below. [First embodiment] [composition] Fig. 1 is a side view of a liquid container, and Fig. 2 is an enlarged cross-sectional view showing the body, shoulder, neck and mouth of the liquid container.

[0010] The liquid container 1 is a plastic bottle. A plastic bottle is one example of a liquid container 1. As shown in FIG. 1, the plastic bottle 1 comprises a resin container body 2. The container body 2 comprises a cylindrical body 3 with a bottom and a shoulder 4 continuous with the upper end of the body 3. The shoulder 4 is formed by drawing a convex arc with an appropriate radius R. A neck portion 5 is continuous with the upper end of the shoulder portion 4, and a mouth portion 6 is continuous with the upper end of the neck portion 5. The mouth portion 6 has a drinking spout 7. 8 is a cap fastener.

[0011] As shown in Figure 2, the PET bottle 1 has a continuous inner circumferential surface 100 formed in a generally frusto-conical shape from the shoulder 4 at the top end of the body 3 to the neck 5, mouth 6, and the top end of the drinking spout 7. The shoulder 4, neck 5, and mouth 6 of the PET bottle 1 have a uniform continuous thickness t, and the outer circumferential surface 200 of the shoulder 4, neck 5, and mouth 6 is formed in a generally frusto-conical shape. A male thread 10 is formed on the generally frusto-conical outer circumferential surface 200. As shown in Figure 1, the male thread 10 is threadedly engaged with the female thread 12 of the cap 11. In Figure 1, the cap 11 is shown in cross section.

[0012] The size of a plastic bottle 1 generally varies depending on the capacity. A 200ml container measures approximately 13.2cm high x 5.4cm wide, a 500ml container measures approximately 21.5cm high x 7.0cm wide, a 1L container measures approximately 25.0cm high x 8.5cm wide, a 2L container measures approximately 31.5cm high x 10.5cm wide, etc. The inner diameter of the drinking spout 7 of the mouth portion 6 does not generally vary depending on the capacity, but is generally set at about 22 mm, and the outer diameter of the cap 11 is generally set at about 28 mm.

[0013] [Setting the tilt angle θ] The illustrated PET bottle 1 has a capacity of 500 ml, a height H from the bottom of the body 3 to the top of the mouth 6 of approximately 21.5 cm, an outer diameter D of the body 3 of approximately 7.0 cm, and an inner diameter of the drinking spout 7 of approximately 22 mm. Based on this, the angle of inclination θ formed by a line C1 extending parallel to the bottle axis (the central axis of the body 3) C and passing through a point A on the shoulder 4, and a line C2 passing through the point A on the shoulder 4 and vertically cutting the inner circumferential surface 100 of a substantially frusto-conical shape that is uniformly continuous with the shoulder 4, neck 5, and mouth 6, is approximately 5° to 30°.

[0014] However, when the inner diameter of the drinking spout 7 is set to approximately 22 mm and the inner peripheral surface 100 is formed into a generally frusto-conical shape, if the inclination angle θ is set too small and gentle, the length of the neck 5 will increase, the position of the shoulder 4 will be lowered, the length of the body 3 will be shortened, and the capacity of the container body 2 will decrease. If the inclination angle θ is set small and gentle without lowering the position of the shoulder 4, the inner diameter D1 of the drinking spout 7 of the mouth 6 will increase, making it difficult to drink. On the other hand, if the inclination angle θ is too large and steep, the inclination of the mouth 6 will become too steep, making it difficult to form the male thread 10 on the outer peripheral surface 200 of the mouth 6, and engagement with the cap 11 will be insufficient.

[0015] The inventors have found that, taking into consideration the formability of the male thread 10 formed on the outer peripheral surface 200 of the mouth portion 6, the prevention of a decrease in the content volume of the container body 2, and the ease of drinking from the drinking spout 7, the inclination angle θ should be within the range of 12° to 27°. Preferably, the inclination angle θ is 13° to 26°, and more preferably 14° to 25°. It has been found that when the inclination angle θ is set within the desired range, the outer peripheral shape of the cap 11 becomes an appropriate cone shape, making the cap 11 easier to grip and open. This allows even people with weak grip strength to easily open the cap 11.

[0016] Although the capacity of the PET bottle 1 has been described as 500 ml, it has been found that even if the capacity of the PET bottle 1 changes to 200 ml, 280 to 350 ml, 650 to 750 ml, 900 ml to 1 L, 2 L, 4 to 5 L, etc., and the size of the PET bottle 1 changes, the magnitude of the above-mentioned inclination angle θ is 12° to 27°, preferably 13° to 26°, and even more preferably 14° to 25°.

[0017] [Operation] 3A to 3C are conceptual diagrams illustrating the operation. In such a PET bottle 1, when drinking a liquid such as a beverage from the container body 2 directly by placing the mouth of the drinking spout 7 on the mouth or pouring it into a cup or glass, the container body 2 is tilted as shown in Figures 3A to 3C.

[0018] In the first embodiment, the shoulder portion 4, the neck portion 5, and the inner peripheral surface 100 of the mouth portion 6 are formed in a generally frusto-conical shape, so that whether the container body 2 begins to be tilted as shown in Fig. 3A, is tilted partway as shown in Fig. 3B, or is tilted all the way as shown in Fig. 3C, outside air always flows into the container body 1 through the drinking spout 7. In other words, the liquid flowing out of the drinking spout 7 does not cover and block the entire area of ​​the drinking spout 7, and the drinking spout 7 is not blocked, so the liquid remains in constant communication with the outside air, and the liquid within the container body 1 flows out in a smooth, uniform flow, preventing the liquid from flowing out in a pulsating flow due to the action of the air.

[0019] Since the inner peripheral surface 100 is formed in an approximately truncated cone shape, no matter which direction the PET bottle 1 is tilted, the liquid such as a beverage inside the container body 2 flows out smoothly along the approximately conical inner peripheral surface 100, and the liquid does not flow out in a pulsating state.

[0020] In the first embodiment, even when the container body 2 is nearly full, the liquid such as a beverage inside the container body 2 flows out smoothly along the inner peripheral surface 100 of the approximately truncated cone shape, and the liquid does not flow in a pulsating manner. This makes it easy to drink the liquid from the drinking spout 7 of the mouth portion 6, and allows a small amount of liquid to be poured accurately into a cup, eliminating the risk of the liquid splashing and spilling on the table or staining clothes.

[0021] In the first embodiment, when the outer diameter D of the body 3 and the inner diameter D1 of the drinking spout 7 are set to predetermined dimensions, the inclination angle θ formed by a line C1 that extends parallel to the bottle axis (the central axis of the body 3) C and passes through a point A on the shoulder 4, and a line C2 that passes through the point A on the shoulder 4 and that runs vertically through the inner circumferential surface 100 of a substantially frusto-conical shape that is uniformly continuous with the shoulder 4, neck 5, and mouth 6, is set to be 12° to 27°. This configuration ensures a sufficient capacity for the container body 2 and improves the formability of the male thread 10 of the mouth 6.

[0022] Furthermore, if the inclination angle θ is set to 13° to 26° or 14° to 25°, the container body 2 becomes easier to grip, and the design of the container body 2 can be improved.

[0023] [Second embodiment] Fig. 4 is a side view of a liquid container according to a second embodiment, and Fig. 5 is a cross-sectional view taken along line VV of Fig. 4. In each figure, the same parts as those in Fig. 1 are given the same reference numerals, and their explanation will be omitted. The PET bottle 1 comprises a cylindrical body 3 with a bottom, a shoulder 4, a neck 5, and a mouth 6. As in the first embodiment, the continuous inner circumferential surface 100 extending from the shoulder 4 at the upper end of the body 3 to the neck 5, the mouth 6, and the upper end of the drinking spout 7 is formed in a generally frusto-conical shape. The shoulder 4, neck 5, and mouth 6 of the PET bottle 1 all have a uniform continuous thickness t.

[0024] As shown in Figure 4, the PET bottle 1 has multiple bulge portions 50 (eight in the second embodiment) extending vertically on the inner surface 100 from the shoulder portion 4 at the upper end of the body portion 3 to the upper end of the neck portion 5, i.e., from the shoulder portion 4 to the lower end of the cap stopper 8.

[0025] As shown in FIG. 5 , each bulge 50 bulges outward from the inner circumferential surface 100 in a generally arc-shaped cross section, and is arranged at equal intervals in the circumferential direction of the inner circumferential surface 100. The width W of each bulge 50 is widest near the shoulder 4 and gradually narrows toward the upper end of the neck 5. The bulge 50 is not limited to being arranged at equal intervals in the circumferential direction of the inner circumferential surface 100, and the bulge 50 may be arranged at unequal intervals. Furthermore, the number of bulge 50 is not limited to multiple, and there may be only one bulge 50. The width W of each bulge 50 is widest near the shoulder 4 and gradually narrows toward the upper end of the neck 5.

[0026] In the second embodiment, when container body 2 is tilted (see FIGS. 3A to 3C), external air entering through spout 7 passes through bulging portion 50 located above and enters container body 1. With this configuration, the liquid flowing out of spout 7 does not cover and block the entire spout 7, and does not block spout 7, so it is always in communication with the outside air, and the liquid inside container body 1 flows out smoothly and uniformly. Therefore, the liquid does not flow in a pulsating manner due to the action of the air.

[0027] In the second embodiment, the bulging portions 50 are arranged at equal intervals around the circumferential direction of the inner circumferential surface 100, so that no matter which way the plastic bottle 1 is tilted, one of the bulging portions 50 is located at the top, and external air flows into the container body 1 through the bulging portion 50 located at the top. Therefore, no matter which way the plastic bottle 1 is tilted, the liquid, such as a beverage, inside the container body 2 flows out smoothly, and the liquid does not flow out in a pulsating state.

[0028] The number of bulging portions 50 is not limited to eight rows. The number of bulging portions 50 may be, for example, four rows, as shown in FIG. 6. By reducing the number of bulging portions 50, the width W of each bulging portion 50 can be increased. By increasing the width W of the bulging portions 50, it becomes easier to pour liquid and to clean the inner surfaces of the curved bulging portions 50.

[0029] [Third embodiment] Fig. 7 is a side view of a liquid container according to a third embodiment, and Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 7. In FIG. 7, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted.

[0030] The PET bottle 1 has multiple (e.g., eight) bulge portions 150 extending vertically on the inner surface 100 from the shoulder portion 4 at the upper end of the bottomed cylindrical body 3 to the upper end of the neck portion 5, i.e., from the shoulder portion 4 to the lower end of the cap stopper 8. The bulging portion 150 includes a continuous portion 150A that continues from the upper end of the body portion 3 toward the middle of the body portion 3. The continuous portion 150A is a part of the bulging portion 150. 8, each of the continuous portions 150A bulges outward from the inner circumferential surface 100A of the body 3 in a generally arc-shaped cross section, and is arranged at equal intervals in the circumferential direction of the inner circumferential surface 100A. The width W of the bulging portions 150A is widest near the shoulder portion 4 and gradually narrows toward the bottom of the body 3.

[0031] The number of bulging portions 150 is not limited to eight. Although not shown in the drawings, the number of bulging portions 150 may be, for example, four. By reducing the number of bulging portions 150, the width W of each bulging portion 150 can be increased. By increasing the width W of the bulging portions 150, it becomes easier to pour liquid and to clean the bulging portions 150.

[0032] When the total height of the plastic bottle 1 is H, the height H2 from the bottom of the plastic bottle 1 to the lower end of the continuous portion 150A is preferably 50 to 60% of the total height H. In other words, the height H3 of the bulging portion 150 is preferably 40 to 50% of the total height H.

[0033] The inventors have confirmed that when the height H3 of the bulging portion 150 is 40 to 50% of the total height H, the liquid does not flow out in a pulsating state.

[0034] In the third embodiment, when container body 2 is tilted (see FIGS. 3A to 3C), external air entering through spout 7 passes through bulging portion 150 located above and enters container body 1. With this configuration, the liquid flowing out of spout 7 does not cover and block the entire spout 7, and does not block spout 7, so it is always in communication with the outside air, and the liquid inside container body 1 flows out smoothly and uniformly. Therefore, the liquid does not flow in a pulsating manner due to the action of the air.

[0035] [Modification of the third embodiment] In the third embodiment, the body 3 is described as being cylindrical with a bottom, but is not limited to a cylindrical with a bottom. For example, as shown in FIG. 9, the body 3 may be a rectangular cylindrical with a bottom. FIG. 9 is a view corresponding to FIG. 8, showing a modified example of the third embodiment. In this modification, the inner peripheral surface 100 from the bottomed cylindrical shoulder portion 4 to the lower end of the cap stopper 8 is provided with four bulging portions 150 extending in the vertical direction, as in Fig. 7, and the bulging portions 150 are connected to a continuous portion 150A. The continuous portion 150A is formed on the inner peripheral surface of the rectangular cylindrical body portion 103, as shown in Fig. 9.

[0036] In this modified example, when the container body 2 is tilted (see FIGS. 3A to 3C), the liquid in the container body 1 flows out smoothly and uniformly. Therefore, the liquid does not flow in a pulsating manner due to the action of the air.

[0037] [Fourth embodiment] Fig. 10 is a diagram showing the fourth embodiment, and is an enlarged cross-sectional view showing the body 3, shoulder 4, neck 5, and mouth 6 of the PET bottle 1. In Fig. 10, the same parts as in Fig. 2 are designated by the same reference numerals, and their explanation will be omitted. A cylindrical portion 20 is provided at the mouth portion 6 of the container body 2. The cylindrical portion 20 extends from the upper end of the mouth portion 6 and is formed so as to cover the outer periphery of the mouth portion 6. A male thread 21 is formed on the outer periphery of the cylindrical portion 20. A female thread 24 of a cap 23 is screwed onto the male thread 21. The outer shape of the cap 23 is approximately cylindrical.

[0038] In the fourth embodiment, the cap 23 is substantially cylindrical, which has an excellent appearance and allows the cap 23 to be easily tightened and loosened.

[0039] [Fifth embodiment] Fig. 11 is a diagram showing the fifth embodiment, and is an enlarged cross-sectional view showing the body 3, shoulder 4, neck 5 and mouth 6 of the liquid container 1. In Fig. 11, the same parts as in Fig. 2 are given the same reference numerals, and their description will be omitted. According to the fifth embodiment, the liquid container 1 is a "bottle can" such as an aluminum can or a steel can, and includes a body 3, a shoulder 4, a neck 5, and a mouth 6. Here, the "bottle can" is an example of the liquid container 1.

[0040] To manufacture the bottle-shaped can 1, a metal plate having an original thickness t1 of 0.285 mm to 0.500 mm is punched into a disk shape and drawn in a cupping press process using a cupping press machine to manufacture a shallow cup-shaped blank.

[0041] Next, the cup-shaped material is redrawn and ironed in a DI press process using a DI press machine to elongate it in the can axis C direction, thereby forming a bottomed cylindrical body (DI can). The bottomed cylindrical body is washed and dried in a washing step, and then painted on its inner and outer surfaces in a painting step, followed by baking. The upper end of the body 3 of the bottomed cylindrical body is reduced in diameter by a mold to form a shoulder 4, a neck 5, and a mouth 6. After the mouth 6 is threaded to form a male thread 10, the upper end is folded back and curled toward the outer periphery, and is then crushed by throttling to form the curled portion, thereby forming a bottle-shaped can.

[0042] In the fifth embodiment, a continuous inner circumferential surface 300 extending from the shoulder 4 at the upper end of the body 3 to the neck 5, the mouth 6 and the upper end of the drinking spout 7 is formed in a generally frusto-conical shape. Since the male thread 10 is formed in the mouth portion 6, unevenness occurs in a part of the inner peripheral surface 300 corresponding to the male thread 10. In this case, the line connecting the thread bases of the male thread 10 is positioned within the inner peripheral surface 300 having a substantially frusto-conical shape.

[0043] In the fifth embodiment, the inner surfaces 300 of the shoulder portion 4, neck portion 5 and mouth portion 6 are formed in an approximately truncated cone shape, so that when the container body 2 is started to be tilted, when the container body 2 is tilted halfway, or when the container body 2 is tilted all the way, the liquid such as a beverage in the container body 2 flows out smoothly along the inner surfaces 300 which are approximately truncated cone shaped, and the liquid does not flow out in a pulsating state.

[0044] Since the inner peripheral surface 300 is formed in a roughly truncated cone shape, no matter in which direction the bottle-shaped can 1 is tilted, the liquid such as a beverage in the container body 2 flows out smoothly along the roughly truncated cone-shaped inner peripheral surface 300, and the liquid does not flow out in a pulsating state.

[0045] Even when the container body 2 is nearly full, the liquid such as a beverage inside the container body 2 flows out smoothly along the inner peripheral surface 300 of the approximately truncated cone shape, and the liquid does not flow out in a pulsating manner. This makes it easy to drink the liquid from the drinking spout 7 of the mouth part 6, and when pouring into a cup, small amounts of liquid can be poured accurately, eliminating the risk of the liquid splashing and spilling on the table or staining clothes.

[0046] In the fifth embodiment, when the outer diameter D of the body 3 and the inner diameter D1 of the drinking spout 7 are set to predetermined dimensions, the inclination angle θ formed by a line C1 extending parallel to the bottle axis (the central axis of the body 3) C and passing through a point A on the shoulder 4, and a line C2 running vertically through the approximately frusto-conical inner surface 100 that is uniformly continuous with the shoulder 4, neck 5, and mouth 6 and that passes through the point A on the shoulder 4, is within the range of 12° to 27°, as in the first embodiment. As in the first embodiment, the inclination angle θ is preferably in the range of 13° to 26°, and more preferably in the range of 14° to 25°.

[0047] As a result, as in the first embodiment, sufficient capacity of the container body 2 can be ensured, the formability of the male thread 10 of the mouth portion 6 can be improved, the container body 2 can be made easier to grip, and the design of the container body 2 can be improved.

[0048] In the fifth embodiment, the mouth portion 6 has a generally frusto-conical shape, and the male thread 10 is formed on the outer peripheral surface 400 of the mouth portion 6. However, although not shown in the figures, a cylindrical portion (see FIG. 10) may be provided on the outer peripheral surface 400, and the male thread 10 may be formed on the outer peripheral surface of the cylindrical portion.

[0049] [Sixth embodiment] Fig. 12 is a side view of a liquid container according to the sixth embodiment. In Fig. 12, the same parts as those in Fig. 1 are designated by the same reference numerals, and their description will be omitted. The plastic bottle 1 includes a container body 2 made of resin. The container body 2 comprises a cylindrical body 3 with a bottom, and a shoulder 4 continuous with the upper end of the body 3. A neck 5 is continuous with the upper end of the shoulder 4, and a mouth 56 is continuous with the upper end of the neck 5. The mouth 56 has a drinking spout 57.

[0050] The first inner circumferential surface 100A extending from the shoulder 4 at the upper end of the body 3 to the upper end of the neck 5 is formed in an approximately truncated cone shape, and the second inner circumferential surface 100B extending from the upper end of the neck 5 to the upper ends of the mouth 56 and the drinking spout 57 is also formed in an approximately truncated cone shape.

[0051] In the sixth embodiment, the first inner circumferential surface 100A is provided with a plurality of bulging portions 250 (eight bulging portions in the sixth embodiment) extending in the vertical direction.

[0052] As in the second embodiment, each of the bulging portions 250 bulges outward from the first inner circumferential surface 100A in a generally arc-shaped cross section, and is arranged at equal intervals in the circumferential direction of the first inner circumferential surface 100A. The width W of each of the bulging portions 250 is widest near the shoulder portion 4 and gradually narrows toward the upper end of the neck portion 5.

[0053] In the sixth embodiment, when the container body 2 is tilted (see FIGS. 3A to 3C), external air entering through the drinking spout 7 passes through the bulging portion 250 located above and enters the container body 1. With this configuration, the liquid flowing out of the drinking spout 7 does not cover and block the entire area of ​​the drinking spout 7, and the drinking spout 7 is not blocked, so the liquid remains in constant communication with the outside air, and the liquid within the container body 1 flows out smoothly and uniformly. Therefore, the liquid does not flow in a pulsating manner due to the action of the air.

[0054] In the sixth embodiment, the bulging portions 250 are arranged at equal intervals around the first inner circumferential surface 100A, so that no matter which way the plastic bottle 1 is tilted, the bulging portions 250 are located at the top, and external air flows into the container body 1 through the bulging portions 250 located at the top. Therefore, no matter which way the plastic bottle 1 is tilted, the liquid, such as a beverage, inside the container body 2 flows out smoothly, and the liquid does not flow out in a pulsating state.

[0055] The number of bulging portions 250 is not limited to eight. The number of bulging portions 250 may be, for example, four. By reducing the number of bulging portions 250, the width W of each bulging portion 250 can be increased. By increasing the width W of the bulging portion 250, it becomes easier to pour liquid and to clean the inner surface of the curved bulging portion 250.

[0056] The angle between a line C1 that extends parallel to the bottle axis C and passes through a point A on the shoulder 4 and a line C3 that cuts vertically through the first inner circumferential surface 100A and passes through a point A on the shoulder 4 is defined as the first inclination angle θ1. The angle between a line C1 that extends parallel to the bottle axis C and passes through a point B on the lower end of the mouth 56 and a line C4 that cuts vertically through the second inner circumferential surface 100B and also passes through a point B on the lower end of the mouth 56 is defined as the second inclination angle θ2.

[0057] In this case, the second tilt angle θ2 may be in the range of 12° to 27°, as in the first embodiment, and is preferably in the range of 13° to 26°, and more preferably in the range of 14° to 25°. The first tilt angle θ1 is larger than the second tilt angle θ2.

[0058] Assuming that the inner diameter D1 of the drinking spout 57 is the same, increasing the first tilt angle θ1 raises the position of the shoulder portion 4, making the height H1 from the top of the body 3 to the top of the mouth 6 smaller than the height H1 shown in FIG. 1 , thereby increasing the capacity of the container body 2. If the first tilt angle θ1 is set too large, there is a risk that liquid will flow out of the drinking spout 57 in a pulsating manner. To prevent this, the first tilt angle θ1 is set in the range of 23° to 29°, preferably in the range of 24° to 28°, and more preferably in the range of 25° to 27°. In this way, the sixth embodiment provides a bottle that is easy to drink from and does not cause liquid to flow out of the drinking spout 57 in a pulsating manner.

[0059] In the sixth embodiment, even when the container body 2 is nearly full, liquid such as a beverage inside the container body 2 flows out along the first inner circumferential surface 100A and the second inner circumferential surface 100B, which are substantially frusto-conical, and similar to the first embodiment, the liquid does not flow out in a pulsating state, making it easy to drink the liquid from the drinking spout 557. Furthermore, since the first inner circumferential surface 100A is provided with the bulge 250, the liquid does not flow out in a pulsating state, similar to the second embodiment, making it easy to drink the liquid from the drinking spout 557. The small second inclination angle θ2 improves the formability of the male thread 10 of the mouth portion 56 onto which the cap 23 is screwed. Also, the large inner diameter D1 of the drinking spout 57 provides a bottle that is easy to drink from. This makes it easier to grip the container body 2, and improves the design of the container body 2.

[0060] [Modification of the sixth embodiment] FIG. 13 is a side view of the liquid container. In this modification, the first inner circumferential surface 100A is provided with a plurality of bulging portions 250. As in the third embodiment, the bulging portions 250 include a continuous portion 250A that continues from the upper end of the body portion 3 toward the middle of the body portion 3. The continuous portion 250A is a part of the bulging portion 250. In this case, the height H3 of the bulging portion 250 is preferably 40 to 50% of the total height H.

[0061] In this modified example, when the container body 2 is tilted (see FIGS. 3A to 3C), the liquid in the container body 1 flows out smoothly and uniformly. Therefore, the liquid does not flow in a pulsating manner due to the action of the air.

[0062] Although the present invention has been described above based on one embodiment, the present invention is not limited to this and various modifications are possible. For example, as shown in Figure 2, the inner surface 100 of the container body 2 is described as having an approximately truncated cone shape, and the line C2 that runs vertically through the inner surface 100 of the container body 2 and passes through one point A of the shoulder portion 4 is described as being straight, but this is not limited to this, and the line C2 that runs vertically through the inner surface 100 may be a surface that curves slightly convexly upward as long as it is not curved convexly downward. Although the description has been given for PET bottles and bottle cans, it goes without saying that the invention can be applied to all liquid containers, such as other plastic containers and glass bottles. [Explanation of symbols]

[0063] 1 liquid container 2 Container body 3. Torso 4 Shoulder 5 Neck 6, 56 Mouth 7, 57 Mouthpiece 8 Cap stopper 10, 21 Male thread 11, 23 Cap 12, 24 female thread 20 Cylindrical part 100, 300 Inner surface 100A First inner surface 100B 2nd inner surface 50, 150, 250 bulge 150A, 250A continuous section 200, 400 outer surface

Claims

1. A liquid container having a shoulder portion connected to the upper end of a body portion, a neck portion connected to the shoulder portion, a mouth portion connected to the upper end of the neck portion, the mouth portion having a drinking spout, and a cap screwed onto the outer periphery of the mouth portion, The inner circumferential surface from the shoulder at the upper end of the body to the neck, the mouth, and the upper end of the drinking spout is formed in a generally truncated cone shape, and the outer circumferential surface of the mouth is formed with a male thread that screws into the female thread of the cap. liquid container.

2. A plurality of bulging portions bulging outward on the inner circumferential surface from the shoulder portion at the upper end of the body portion to the upper end of the neck portion are provided. The liquid container according to claim 1 .

3. The bulge portion continues from the upper end of the body portion toward the middle of the body portion. The liquid container according to claim 2 .

4. The bulging portions are arranged at equal intervals in the circumferential direction. The liquid container according to any one of claims 1 to 3.

5. The width of the bulge gradually narrows toward the upper end of the neck. The liquid container according to any one of claims 1 to 3.

6. The neck and the mouth have a uniform thickness, The male screw is formed on the outer peripheral surface of the substantially truncated cone shape of the mouth portion. The liquid container according to any one of claims 1 to 3.

7. A cylindrical portion is provided on the outer peripheral surface of the mouth portion, The male thread is formed on the outer peripheral surface of the cylindrical portion. The liquid container according to any one of claims 1 to 3.

8. The inclination angle θ formed by a line extending parallel to the central axis of the body and passing through one point on the shoulder and a line vertically crossing the inner circumferential surface and passing through the one point on the shoulder is within a range of 12° to 27°. The liquid container according to any one of claims 1 to 3.

9. The inclination angle θ formed by a line extending parallel to the central axis of the body and passing through one point on the shoulder and a line vertically crossing the inner circumferential surface and passing through the one point on the shoulder is within a range of 13° to 26°. The liquid container according to any one of claims 1 to 3.

10. The inclination angle θ formed by a line extending parallel to the central axis of the body and passing through one point on the shoulder and a line vertically crossing the inner circumferential surface and passing through the one point on the shoulder is within the range of 14° to 25°. The liquid container according to any one of claims 1 to 3.

11. A liquid container having a shoulder portion connected to the upper end of a body portion, a neck portion connected to the shoulder portion, a mouth portion connected to the upper end of the neck portion, the mouth portion having a drinking spout, and a cap screwed onto the outer periphery of the mouth portion, A first inner circumferential surface extending from the shoulder at the upper end of the body to the upper end of the neck is formed in a generally frusto-conical shape, and a second inner circumferential surface extending from the upper end of the neck to the upper ends of the mouth and the drinking spout is also formed in a generally frusto-conical shape, and a male thread is formed on the outer circumferential surface of the mouth to be threadedly engaged with the female thread of the cap, a first inclination angle θ1 formed by a line extending parallel to the central axis of the body portion and passing through a point on the shoulder portion and a line vertically cutting through the first inner circumferential surface and passing through the point on the shoulder portion is larger than a second inclination angle θ2 formed by a line extending parallel to the central axis of the body portion and passing through a point on the lower end of the mouth portion and a line vertically cutting through the second inner circumferential surface and passing through the point on the mouth portion; The first inner circumferential surface is provided with a plurality of bulging portions bulging outward. liquid container.

12. The bulge portion continues from the upper end of the body portion toward the middle of the body portion. The liquid container according to claim 11.

13. The bulging portions are arranged at equal intervals in the circumferential direction.

13. A liquid container according to claim 11 or 12.

14. The width of the bulge gradually narrows toward the upper end of the neck.

13. A liquid container according to claim 11 or 12.

15. The first tilt angle θ1 is set within a range of 23° to 29°, and the second tilt angle θ2 is set within a range of 12° to 27°.

13. A liquid container according to claim 11 or 12.

16. The first tilt angle θ1 is set within a range of 24° to 28°, and the second tilt angle θ2 is set within a range of 13° to 26°.

13. A liquid container according to claim 11 or 12.

17. The first tilt angle θ1 is set within a range of 25° to 27°, and the second tilt angle θ2 is set within a range of 14° to 25°.

13. A liquid container according to claim 11 or 12.

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