Liquid Container

Abstract

To provide a liquid container capable of suppressing liquid from flowing out in a pulsating state even when the container is nearly full when liquid is flowed out from a drinking spout of the mouth part. [Solution] In a PET bottle 1 having a shoulder 4 connected to the upper end of a body 3, a neck 5 connected to the shoulder 4, and a mouth 6 having a drinking spout 7 connected to the upper end of the neck 5, and a cap 11 screwed onto the outer periphery of the mouth 6, the entire 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 into an approximately truncated cone shape, and a male thread 10 is formed on the outer circumferential surface 200 of the mouth 6 which screws into a female thread 12 of the cap 11.

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 having 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, for example, a container for storing juice, coffee drinks, alcoholic drinks, seasonings, etc., and is a plastic bottle, aluminum can, steel can, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-104094 A Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, when the liquid container is tilted to allow liquid to flow out of the mouth, the mouth is blocked by the liquid when the container is nearly full, and the liquid flows out in a pulsating manner due to the action of the air inside the liquid container. In this case, there are problems such as it being difficult to drink the liquid from the mouth, it being difficult to pour a small amount of liquid accurately when pouring 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 problems of the conventional liquid container and provide a liquid container that can prevent liquid from flowing out in a pulsating state when liquid is flowing 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 connected to the upper end of a body portion, a neck portion connected to the shoulder portion, and 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, in which the entire 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 the outer circumferential surface of the mouth portion is formed with a male thread that screws into the female thread of the cap. Effect of the Invention

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

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

[0009] An embodiment of the present invention will now be described. [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 a radius R of an appropriate dimension. The upper end of the shoulder portion 4 is connected to a neck portion 5, and the upper end of the neck portion 5 is connected to a mouth portion 6. The mouth portion 6 has a drinking spout 7. 8 is a cap fastener.

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

[0012] The size of a plastic bottle 1 generally varies according to its capacity. For a 200ml capacity, the dimensions are approximately 13.2cm high x 5.4cm wide, for a 500ml capacity, the dimensions are approximately 21.5cm high x 7.0cm wide, for a 1L capacity, the dimensions are approximately 25.0cm high x 8.5cm wide, for a 2L capacity, the dimensions are 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 standardized at about 22 mm, and the outer diameter of the cap 11 is standardized at about 28 mm.

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

[0014] However, when the inside diameter of the drinking spout 7 is set to about 22 mm and the inner peripheral surface 100 is made to be substantially frusto-conical, if the inclination angle θ is set too small and gentle, the length of the neck 5 will be long, the position of the shoulder 4 will be lowered, the length of the body 3 will be shortened, and the content volume of the container body 2 will be reduced. If the inclination angle θ is set small and gentle without lowering the position of the shoulder 4, the inside diameter D1 of the drinking spout 7 of the mouth 6 will be large, 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 be 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 moldability of the male thread 10 formed on the outer peripheral surface 200 of the mouth portion 6, the suppression of a decrease in the content of the container body 2, the ease of drinking from the drinking spout 7, and the like, the inclination angle θ is within a range of 12° to 27°. The inclination angle θ is preferably 13° to 26°, and more preferably 14° to 25°. It has been found that when the inclination angle θ is set within a desirable 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 PET bottle 1 has been described as 500 ml, it has been found that even if the capacity of 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 PET bottle 1 changes, the magnitude of the above-mentioned inclination angle θ is 12° to 27°, preferably 13° to 26°, and more preferably 14° to 25°.

[0017] [Operation] 3A to 3C are conceptual diagrams for explaining the operation. In such a plastic bottle 1, when the liquid such as a beverage in the container body 2 is to be drunk directly by placing the mouth over the drinking spout 7 or poured 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 substantially truncated cone shape, so that when the container body 2 starts to be tilted as shown in Fig. 3A, when the container body 2 is tilted halfway as shown in Fig. 3B, or when the container body 2 is tilted all the way as shown in Fig. 3C, the outside air always flows into the container body 1 through the drinking spout 7. In other words, the liquid flowing out from the drinking spout 7 does not cover and block the entire area of ​​the drinking spout 7, and does not block the drinking spout 7, so that the liquid can always maintain a state of communication with the outside air, and the liquid in the container body 1 flows out while maintaining a natural and uniform flow state, so that the liquid does not flow out in a pulsating state due to the action of the air.

[0019] Since the inner circumferential surface 100 is formed into an approximately truncated cone shape, no matter in which direction the plastic bottle 1 is tilted, the liquid, such as a beverage, inside the container body 2 flows out smoothly along the approximately conical inner circumferential 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 in the container body 2 flows out smoothly along the inner peripheral surface 100 of the substantially truncated cone shape, and the liquid does not flow out in a pulsating state. Therefore, the liquid is easy to drink from the drinking spout 7 of the mouth part 6, and when pouring into a cup, a small amount of liquid can be poured accurately, eliminating the liquid from 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 between a line C1 that extends parallel to the bottle axis (the central axis of the body 3) C and passes through a point A of the shoulder 4, and a line C2 that passes through the point A of the shoulder 4 and vertically cuts 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 12° to 27°. With this configuration, a sufficient capacity of the container body 2 can be ensured, and the formability of the male thread 10 of the mouth 6 can be improved.

[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 drawing, the same parts as those in Fig. 1 are given the same reference numerals and their description will be omitted. The plastic bottle 1 comprises a cylindrical body 3 with a bottom, a shoulder 4, a neck 5, and a mouth 6. A continuous inner circumferential surface 100 extending from the shoulder 4 at the upper end of the body 3 to the upper end of the neck 5, the mouth 6, and the drinking spout 7 is formed into a substantially truncated cone shape, as in the first embodiment. The shoulder 4, neck 5, and mouth 6 of the plastic bottle 1 have a uniform continuous thickness t.

[0024] As shown in FIG. 4, the PET bottle 1 has multiple bulge portions 50 (eight bulge portions in the second embodiment) extending vertically on the inner surface 100 from the shoulder portion 4 at the upper end of the 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 fastener 8.

[0025] As shown in FIG. 5, each of the bulging portions 50 bulges outward from the inner circumferential surface 100 in a cross-sectionally generally arcuate shape, and is disposed at equal intervals in the circumferential direction of the inner circumferential surface 100. The width W of the bulging portion 50 is widest near the shoulder portion 4, and gradually narrows toward the upper end of the neck portion 5. The bulging portions 50 are not limited to being disposed at equal intervals in the circumferential direction of the inner circumferential surface 100, and the bulging portions 50 may be disposed at unequal intervals. In addition, the number of the bulging portions 50 is not limited to a plurality, and there may be only one bulging portion 50. The width W of the bulging portion 50 is widest near the shoulder portion 4, and gradually narrows toward the upper end of the neck portion 5.

[0026] In the second embodiment, when the container body 2 is tilted (see Figs. 3A to 3C), the outside air entering through the drinking spout 7 passes through the bulging portion 50 located above and enters the container body 1. With this configuration, the liquid flowing out from the drinking spout 7 does not cover and block the entire area of ​​the drinking spout 7, and does not block the drinking spout 7, so that the liquid can always remain in communication with the outside air, and the liquid in the container body 1 flows out while maintaining a natural, uniform flow. Therefore, the liquid does not flow out in a pulsating state due to the action of the air.

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

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

[0029] [Third embodiment] Fig. 7 is a side view of the liquid container according to the 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 their description will be omitted.

[0030] The PET bottle 1 has multiple (e.g., eight) bulges 150 extending vertically on the inner surface 100 from the shoulder 4 at the upper end of the bottomed cylindrical body 3 to the upper end of the neck 5, i.e., from the shoulder 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 continuous portion 150A bulges outward from the inner circumferential surface 100A of the body 3 in a generally arc-shaped cross section, and is disposed at equal intervals in the circumferential direction of the inner circumferential surface 100A. The width W of the bulging portion 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 portion 150, it becomes easier to pour liquid and to clean the bulging portion 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 present 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, liquid flowing out from spout 7 does not cover and block the entire spout 7, and does not block spout 7, so that the liquid can always remain in communication with the outside air, and the liquid in container body 1 flows out while maintaining a natural, uniform flow. Therefore, the liquid does not flow out in a pulsating state due to the action of the air.

[0035] [Modification of the third embodiment] In the third embodiment, the body portion 3 is described as being cylindrical with a bottom, but is not limited to being cylindrical with a bottom. For example, as shown in FIG. 9, the body portion 103 may be a square cylinder 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 circumferential 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 continuous with continuous portions 150A. The continuous portions 150A are formed on the inner circumferential surface of the rectangular tubular 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 while maintaining a smooth and uniform flow state. Therefore, the liquid does not flow out in a pulsating state 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 plastic bottle 1. In Fig. 10, the same parts as those in Fig. 2 are given the same reference numerals, and their explanation will be omitted. A cylindrical portion 20 is provided at the mouth 6 of the container body 2. The cylindrical portion 20 extends from the upper end of the mouth 6 and is formed so as to cover the outer periphery of the mouth 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 into 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 those in Fig. 2 are given the same reference numerals and their explanation 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 one 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 cylinder is washed and dried in a washing step, and then painted on its inner and outer surfaces and baked in a painting step. Furthermore, the upper end side of the body 3 of the bottomed cylinder is reduced in diameter by a die 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 side is folded back towards the outer periphery and curled, and is then crushed by throttling to form a curled portion, thereby forming a bottle-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 substantially 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, a 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 circumferential surface 300 of the shoulder portion 4, the neck portion 5 and the mouth portion 6 are formed into an approximately frusto-conical shape, so that when the container body 2 starts 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 circumferential surface 300 which is approximately frusto-conical in shape, regardless of the degree of tilt, and the liquid does not flow out in a pulsating state.

[0044] Since the inner peripheral surface 300 is formed in an approximately truncated cone shape, no matter in which direction the bottle-can 1 is tilted, the liquid such as a beverage in the container body 2 flows out smoothly along the approximately 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 in 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 state. This makes it easy to drink the liquid from the drinking spout 7 of the mouth part 6, and when pouring into a cup, a small amount 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 specified dimensions, the inclination angle θ between a line C1 that extends parallel to the bottle axis (the central axis of the body 3) C and passes through a point A of the shoulder 4, and a line C2 that passes through the point A of the shoulder 4 and vertically cuts the inner surface 100 of an approximately truncated cone shape that is uniformly continuous with the shoulder 4, the neck 5, and the mouth 6, is within the range of 12° to 27°, as in the first embodiment. As in the first embodiment, the inclination angle θ is preferably within a range of 13° to 26°, and more preferably within a range of 14° to 25°.

[0047] As a result, similar to 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 drawings, 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 given 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 continuing to the upper end of the body 3. A neck 5 continues to the upper end of the shoulder 4, and a mouth 56 continues to the upper end of the neck 5. The mouth 56 has a drinking spout 57.

[0050] A 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 into an approximately truncated cone shape, and a 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 formed into 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 arcuate cross section, and is disposed 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), the outside 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 from the drinking spout 7 does not cover and block the entire area of ​​the drinking spout 7, and does not block the drinking spout 7, so that the liquid can always remain in communication with the outside air, and the liquid in the container body 1 flows out while maintaining a natural, uniform flow. Therefore, the liquid does not flow out in a pulsating state due to the action of the air.

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

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

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

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

[0058] If the inner diameter D1 of the drinking spout 57 is the same, by increasing the first inclination angle θ1, the position of the shoulder 4 is raised, and the height H1 from the upper end of the body 3 to the upper end of the mouth 6 becomes smaller than the height H1 shown in FIG. 1, and the capacity of the container body 2 increases. If the first inclination angle θ1 is made too large, there is a risk that the liquid will flow out of the drinking spout 57 in a pulsating state. To solve this, the first inclination angle θ1 is in the range of 23° to 29°, preferably the inclination angle θ is in the range of 24° to 28°, and more preferably the range of 25° to 27°. In this way, in the sixth embodiment, a bottle that is easy to drink from without causing the liquid to flow out of the drinking spout 57 in a pulsating state can be provided.

[0059] In the sixth embodiment, even when the container body 2 is nearly full, liquid such as a beverage in the container body 2 flows out along the first inner circumferential surface 100A and the second inner circumferential surface 100B having a substantially frusto-conical shape, and similarly 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 bulging portion 250, similarly to the second embodiment, the liquid does not flow out in a pulsating state, making it easy to drink the liquid from the drinking spout 557. Since the second inclination angle θ2 is small, the moldability of the male thread 10 of the mouth portion 56 into which the cap 23 is screwed can be improved. Also, since the inner diameter D1 of the drinking spout 57 is large, a bottle that is easy to drink from can be provided. Effects such as the container body 2 being easier to grip and the design of the container body 2 being improved can be obtained.

[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 portion 250 has 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 while maintaining a smooth and uniform flow state. Therefore, the liquid does not flow out in a pulsating state 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 embodiment and various modifications are possible. For example, as shown in FIG. 2, the inner surface 100 of the container body 2 is approximately frusto-conical in shape, and the line C2 that runs vertically through the inner surface 100 of the container body 2 and passes through a point A of the shoulder portion 4 is described as being a straight line, but this is not limited to this, and the line C2 that runs vertically through the inner surface 100 may be a surface that is slightly convexly curved upwards, as long as it is not convexly curved downwards. Although the description has been given with respect to PET bottles and bottle cans, it goes without saying that the present 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 Mouth 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 body portion having an upper end connected to a shoulder portion, a neck portion having a mouth portion connected to an upper end of the neck portion, the mouth portion having a drinking spout, and a cap screwed onto an outer periphery of the mouth portion, A series of inner peripheral surfaces from the shoulder at the upper end of the body to the neck, the mouth, and the upper end of the drinking spout are formed in a substantially truncated cone shape, and a male thread is formed on the outer peripheral surface of the mouth to screw into the female thread of the cap. liquid container.

2. A plurality of bulging portions bulging outwardly 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.

2. 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.

3. The liquid container according to claim 2.

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

4. A liquid container according to claim 2 or 3.

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

4. A liquid container according to claim 2 or 3.

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

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

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

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

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

11. A liquid container having a body portion having an upper end connected to a shoulder portion, a neck portion having a mouth portion connected to an upper end of the neck portion, the mouth portion having a drinking spout, and a cap screwed onto an outer periphery of the mouth portion, A first inner circumferential surface extending from the shoulder of the upper end of the body to the upper end of the neck is formed in a generally truncated cone 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 formed in a generally truncated cone shape, and a male thread is formed on the outer circumferential surface of the mouth to be screwed into the female thread of the cap, a first inclination angle θ1 between a line extending parallel to the central axis of the body portion, 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 between a line extending parallel to the central axis of the body portion, passing through a point on a 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 outwardly. liquid container.

12. The bulge portion continues from the upper end of the body portion toward the middle of the body portion.

12. 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 inclination angle θ1 is within a range of 23° to 29°, and the second inclination angle θ2 is within a range of 12° to 27°.

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

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

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

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

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

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