Bottle bottom structure, bottle and bottle blowing mold

Abstract

A bottle bottom structure, a bottle and a bottle blowing mold belong to the technical field of bottle structures, and comprise a base with a central boss and a plurality of claws, the base comprises a base surface which partially belongs to the same spherical surface, and the claw petals are arranged on the base surface and distributed around the central boss; the spherical surface is a spherical crown surface and / or a spherical belt surface, the base where the claw petals are located comprises a partial spherical surface, flowing of materials during bottle bottom forming is facilitated, the stretching distance of the far ends of the claw petals is reduced by adopting the partial spherical surface mode, the forming difficulty of the claw petals is reduced, and the distribution uniformity of the materials of the bottle bottom is improved through cooperation of the two parts. Therefore, the forming difficulty of the bottle bottom is reduced, the bottle bottom is formed fully, the structural strength of the bottle bottom is guaranteed, the bottle bottom can still meet the performance requirement after weight reduction, meanwhile, the gas pressure of bottle blowing forming is reduced, and the energy consumption in the bottle production process is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of bottle structures, and in particular relates to a bottle bottom structure, a bottle and a bottle blowing mould. Background Art

[0002] In the prior art, the bottom of a plastic bottle supports the entire bottle and its contents. When in use, the plastic bottle has good requirements for resistance to top pressure, axial load, internal pressure, etc. In order to compensate for the inconsistency in stress and strength caused by the low uniformity of the bottom material, and the strength of the bottom structure, the bottom thickness is generally increased to ensure that the plastic bottle meets the performance requirements.

[0003] With the development trend of environmental protection and carbon reduction society construction, plastic bottles need to reduce weight to reduce the use of raw materials, while ensuring their performance and reducing energy consumption in the manufacturing process, which puts higher requirements on the bottom structure of plastic bottles and corresponding molds. Summary of the invention

[0004] In order to overcome at least some of the deficiencies in the prior art, the present invention provides a bottle bottom structure, a bottle and a bottle blowing mold.

[0005] On the one hand, a bottle bottom structure is provided, including a base with a central boss and a plurality of claw petals; the base includes a seat surface that partially belongs to the same spherical surface, the claw petals are arranged on the seat surface and distributed around the central boss; the spherical surface is a spherical crown surface and / or a spherical zone surface.

[0006] A further preferred solution is that the seat surface includes a spherical zone surface belonging to the same spherical surface and a spherical crown surface located in the middle of the spherical zone surface, and the spherical zone surface and the spherical crown surface are connected by a tangent arc surface transition.

[0007] A further preferred solution is that the seat surface includes a spherical crown surface with a radius of R1 and an annular surface connected to the spherical crown surface and the upper end of the base; the annular surface is formed by rotating an arc with a radius of R2 around the central axis of the spherical crown surface.

[0008] A further preferred solution is that the bottle bottom diameter D and the arc radius R2 satisfy the relationship: D=(3-5)R2; the spherical crown radius R1 and the arc radius R2 satisfy the relationship: R1=(4-6)R2.

[0009] A further preferred solution is that the claw flap includes a first claw flap surface, a second claw flap surface and a third claw flap surface, the third claw flap surface is provided with two and is arranged opposite to each other, the first claw flap surface, the second claw flap surface and the third claw flap surface enclose the claw flap; the width of the first claw flap surface gradually increases as it extends radially away from the center boss, and gradually moves away from the center boss in the axial direction; the width of the second claw flap surface first increases and then decreases as it extends axially away from the upper end of the bottle bottom.

[0010] A further preferred solution is that the first claw petal surface is connected to the second claw petal surface via an arc surface in the circumferential direction, the first claw petal surface is connected to the third claw petal surface via an arc surface in the radial direction, and the second claw petal surface is connected to the third claw petal surface in the axial direction.

[0011] A further preferred solution is that the widest part of the second claw flap surface is located at the junction of the second claw flap surface, the third claw flap surface and the base.

[0012] A further preferred solution is that the ratio of the ground contact width w of the first claw flap to the bottle bottom diameter D is 0.08-0.12.

[0013] On the other hand, a bottle is also provided, the bottom of the bottle adopts the bottle bottom structure as described above.

[0014] On the other hand, a bottle blowing mold is provided, which has a molding cavity, and the molding cavity at least defines the outer surface of the above-mentioned bottle bottom structure.

[0015] The beneficial effects of the present invention are as follows: the base where the claw flap is located includes a partial spherical surface, which is beneficial to the flow of material when the bottle bottom is formed. The partial spherical surface is adopted to reduce the stretching distance of the far end of the claw flap and reduce the difficulty of forming the claw flap. The two work together to improve the uniformity of the distribution of the bottle bottom material; thereby reducing the difficulty of forming the bottle bottom, making the bottle bottom fully formed, ensuring the structural strength of the bottle bottom, and making the bottle bottom still meet the performance requirements after weight reduction. At the same time, the gas pressure of the bottle blow molding is reduced, and the energy consumption in the bottle production process is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of the bottle bottom structure of this embodiment; Figure 2 This is a bottom view of the bottle bottom structure of this embodiment; Figure 3 This is a schematic diagram of the structure when the seat surface of this embodiment adopts the first structure; Figure 4 This is a schematic diagram of the structure when the seat surface of this embodiment adopts the second structure; Figure 5 This is a longitudinal cross-sectional view of the bottle bottom structure of this embodiment; Figure 6 It is a schematic diagram of the structure of the bottle in this embodiment. DETAILED DESCRIPTION

[0017] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0019] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the present invention, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0020] like Figures 1 to 6 As shown, this embodiment discloses a bottle bottom structure, including a base 1 with a central boss 11 and a plurality of claw petals 2, the base 1 includes a seat surface 12 that partially belongs to the same spherical surface, the claw petals 2 are arranged on the seat surface 12 and distributed around the central boss 11, and the spherical surface is a spherical crown surface and / or a spherical zone surface. A portion of the seat surface 12 is a spherical surface, which can enable the bottle bottom material to maintain good fluidity during molding, while taking into account reducing the stretching distance of the distal end of the claw petal, reducing the molding difficulty of the farthest claw petal of the bottle bottom, and the two work together to improve the uniformity of the distribution of the bottle bottom material.

[0021] Specifically, the seat surface 12 can be one of the following structures: The seat surface 12 includes a spherical zone surface 122 belonging to the same spherical surface and a spherical crown surface 121 located in the middle of the spherical zone surface 122. The spherical zone surface 122 and the spherical crown surface 121 are connected by a tangent arc surface transition; The seat surface 12 includes a spherical crown surface 121 with a radius of R1 and a torus surface 123 connected to the spherical crown surface 121 and the upper end of the base 1. The torus surface 123 is formed by rotating an arc with a radius of R2 around the central axis of the spherical crown surface 121, so the spherical crown surface 121 and the torus surface 123 have a common rotation center axis; as a preferred embodiment, the relationship between the bottle bottom diameter D and the arc radius R2 satisfies the relationship: D=(3~5)R2, and the relationship between the spherical crown surface radius R1 and the arc radius R2 satisfies the relationship: R1=(4~6)R2.

[0022] In this embodiment, the claw flap 2 includes a first claw flap surface 21, a second claw flap surface 22 and a third claw flap surface 23. The third claw flap surface 23 is provided with two and arranged opposite to each other. The first claw flap surface 21, the second claw flap surface 22 and the third claw flap surface 23 enclose and form the claw flap 2. Specifically, the first claw flap surface 21 is connected to the second claw flap surface 22 via an arc surface in the circumferential direction, the first claw flap surface 21 is connected to the third claw flap surface 23 via an arc surface in the radial direction, and the second claw flap surface 22 is connected to the third claw flap surface 23 in the axial direction; the width of the first claw flap surface 21 gradually increases when it extends away from the central boss 11 in the radial direction, and gradually moves away from the central boss 11 in the axial direction; the width of the second claw flap surface 22 first increases and then decreases when it extends away from the upper end of the bottle bottom in the axial direction, wherein the widest part is basically located at the junction of the second claw flap surface 22, the third claw flap surface 23 and the base 1. In this embodiment, the first claw surface 21 is directly connected to the central boss 11, thereby avoiding a position between the first claw surface 21 and the central boss 11 that is difficult to form, which is conducive to the forming of the bottle bottom. At the same time, the width of the claw 2 of the second claw surface 22 along its extension direction increases first and then decreases, which can increase the contour area connected to the seat surface 12 and help improve the ability of the bottle bottom to withstand internal pressure.

[0023] In practice, 3 to 10 claw petals 2 may be provided on the seat surface 12 , and preferably 5 or 6 claw petals 2 may be provided.

[0024] In practice, the ratio of the ground contact width w of the claw 2 to the diameter D of the bottle bottom is 0.08 to 0.12, preferably 0.1. The ground contact width w is the length of the longest arc of the claw 2 in contact with the horizontal plane after the bottle is placed on the horizontal plane, and the center of the longest arc is on the central axis of the bottle bottom. In the prior art, the ratio is about 0.05. Compared with the prior art, by increasing the ground contact width w of the claw 2, it is helpful to improve the ability of the bottle bottom to resist axial load and deformation ability to resist top pressure.

[0025] Correspondingly, the gap d1 between adjacent first claw petal surfaces 21 will decrease, but the stable distance s remains basically unchanged. The ratio of the gap d1 between adjacent first claw petal surfaces 21 to the bottle bottom diameter D is 0.21-0.25, preferably 0.23, and the ratio of the stable distance s to the bottle bottom diameter D is 0.29-0.32, preferably 0.30, to maintain the stability of the bottle bottom structure. The stable distance s is the distance between the longest arc of the first claw petal surface 21 in contact with the horizontal plane and the central axis of the bottle bottom after the bottle is placed on the horizontal plane. In the prior art, the ratio of the gap d1 between adjacent first claw petal surfaces 21 to the bottle bottom diameter D is about 0.29, and the ratio of the stable distance s to the bottle bottom diameter D is about 0.31; compared with the prior art, the present embodiment has substantially the same placement stability.

[0026] In this embodiment, the ratio of the ground clearance d2 at the bottom of the central boss 11 to the height H of the bottle bottom is 0.2-0.3, preferably 0.25. In the prior art, the ratio is about 0.18. Compared with the prior art, by increasing the ground clearance d2 of the central boss 11, the maximum height h of the first claw petal surface 21 is increased, and the blowing distance between the bottle mouth and the first claw petal surface 21 is reduced, which is beneficial to the bottle bottom molding.

[0027] Accordingly, the slope i1 of the first claw surface 21 is increased, and the slope i2 of the second claw surface 22 remains basically unchanged, which is conducive to the flow of materials and the molding of the bottle bottom. In the bottle bottom structure of this embodiment, the slope i1 of the first claw surface 21 is 19° to 22°, preferably 20°, and the slope i2 of the second claw surface 22 is 24° to 26°, preferably 25°. In the prior art, the slope i1 of the first claw surface 21 is 14°, and the slope i2 of the second claw surface 22 is 24°.

[0028] Based on the bottle bottom structure disclosed above, this embodiment further discloses a bottle, the bottom of which adopts the bottle bottom structure, so that the bottle bottom structure of the bottle has the characteristics of low molding difficulty and strong pressure resistance.

[0029] Based on the bottle disclosed above, this embodiment further discloses a bottle blowing mold, which has a molding cavity, and the molding cavity at least defines the outer surface of the bottle bottom structure. As an embodiment, the bottle blowing mold includes a bottom mold and two half molds, and the bottom mold and the two half molds are configured to form the above-mentioned molding cavity, and the molding cavity defines the outer surface of the portion other than the bottle mouth of the bottle, wherein the outer surface of the bottle bottom structure is defined by or mainly by the bottom mold.

[0030] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means belongs to the protection scope of the present invention.

Claims

1. Bottle bottom structure, characterized by: It comprises a base with a central boss and a plurality of claw petals; the base comprises a seat surface which partially belongs to the same spherical surface, the claw petals are arranged on the seat surface and distributed around the central boss; the spherical surface is a spherical crown surface and / or a spherical zone surface.

2. The bottle bottom structure according to claim 1, characterized in that: The seat surface comprises a spherical zone surface belonging to the same spherical surface and a spherical crown surface located in the middle of the spherical zone surface, and the spherical zone surface and the spherical crown surface are connected by a tangent arc surface transition.

3. The bottle bottom structure according to claim 1, characterized in that: The seat surface includes a spherical crown surface with a radius of R1 and a torus surface connected to the spherical crown surface and the upper end of the base; the torus surface is formed by rotating an arc with a radius of R2 around the central axis of the spherical crown surface.

4. The bottle bottom structure according to claim 3, characterized in that: The relationship between the bottle bottom diameter D and the arc radius R2 is: D=(3~5)R2; the relationship between the spherical crown radius R1 and the arc radius R2 is: R1=(4~6)R2.

5. The bottle bottom structure according to claim 1, characterized in that: The claw petal includes a first claw petal surface, a second claw petal surface and a third claw petal surface. The third claw petal surface is provided with two and is arranged opposite to each other. The first claw petal surface, the second claw petal surface and the third claw petal surface enclose the claw petal; the width of the first claw petal surface gradually increases as it extends radially away from the center boss, and gradually moves away from the center boss in the axial direction; the width of the second claw petal surface first increases and then decreases as it extends axially away from the upper end of the bottle bottom.

6. The bottle bottom structure according to claim 5, characterized in that: The first claw petal surface is connected to the second claw petal surface via an arc surface in the circumferential direction, the first claw petal surface is connected to the third claw petal surface via an arc surface in the radial direction, and the second claw petal surface is connected to the third claw petal surface in the axial direction.

7. The bottle bottom structure according to claim 5, characterized in that: The widest part of the second claw petal surface is located at the junction of the second claw petal surface, the third claw petal surface and the base.

8. The bottle bottom structure according to claim 5, characterized in that: The ratio of the ground contact width w of the first claw flap to the bottle bottom diameter D is 0.08-0.

12.

9. Bottle, characterized in that: The bottom of the bottle adopts the bottle bottom structure as described in any one of claims 1-8.

10. Bottle blowing mold, having a molding cavity, characterized in that: The molding cavity at least defines the outer surface of the bottle bottom structure according to any one of claims 1-8.

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