Cavity structure and bottle blowing mold

Abstract

This invention discloses a mold cavity structure, comprising two mold cavity half-molds that define at least part of the mold cavity through a mold-closing mechanism. Each mold cavity half-mold has a mounting groove, and an upper clamping opening is fixedly installed within the mounting groove. The upper clamping openings enclose a clamping portion. At least one upper clamping opening and a corresponding mounting groove are configured to form a half-venting area and a venting channel. The half-venting area communicates with the mold cavity and the venting channel, respectively, and the venting channel communicates with the outside. A blow molding die is also disclosed, comprising a mold cavity structure and a bottom mold. The mold cavity structure and the bottom mold together define the shape of the container. The mold cavity structure is the aforementioned mold cavity structure. In this invention, the gas in the upper part of the mold cavity can be quickly discharged through the venting structure of the upper clamping opening, making it easier to form the bottle neck and shoulder, resulting in a fuller bottle neck and shoulder, effectively ensuring blow molding efficiency and finished product quality.

Description

Technical Field

[0001] This invention relates to the field of blow molding technology, specifically to a mold cavity structure and a blow molding die. Background Technology

[0002] Most plastic beverage bottles are manufactured using blow molding processes with blow molds. The blow molding process involves first injection molding a preform to form the bottle neck, then placing the preform into a blow mold for shaping the bottle body and bottom. This shaping is typically accomplished by the blow mold. Existing blow mold structures include a bottle body template, a bottom template at the bottom of the bottle body template, and an upper clamping opening at the top of the bottle body template. The bottle body template includes left and right halves, etc. For specific blow mold applications, please refer to the applicant's earlier patent applications, such as Chinese invention patent application number CN201811538334.9.

[0003] However, in existing blow molding dies, the upper clamp does not have an exhaust structure. During blow molding, the gas in the upper part of the mold cavity is slowly discharged and cannot be discharged quickly, which makes the bottle neck and bottle shoulder form slowly and difficult to form quickly. Furthermore, the bottle neck and bottle shoulder may have forming defects, affecting blow molding efficiency and product quality. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, a mold cavity structure and blow molding die are provided, which can quickly discharge the gas in the upper part of the mold cavity, making the bottle neck and shoulder easier to form.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A mold cavity structure includes two mold cavity halves that define at least a portion of the mold cavity by mold closing. Each mold cavity halves are provided with a mounting groove, and an upper clamping opening is fixedly installed in the mounting groove. The upper clamping opening surrounds and forms a clamping opening portion. At least one of the upper clamping openings and the corresponding mounting groove are configured to form a half-venting area and a venting channel. The half-venting area is connected to the mold cavity and the venting channel, respectively, and the venting channel is connected to the outside.

[0007] In this invention, the half-exhaust area is formed by configuring a portion of the bottom surface of the upper clamp and a portion of the bottom surface of the mounting groove.

[0008] In this invention, the half-exhaust area includes an exhaust recess, which is disposed on the bottom surface of the upper clamp and / or the bottom surface of the mounting groove.

[0009] In this invention, an exhaust channel is formed between the mounting surface of the upper clamp and the side wall of the mounting groove.

[0010] In this invention, the exhaust passage includes an exhaust notch disposed on the mounting surface and / or the side wall.

[0011] In this invention, the venting notch includes at least one of the following: a venting chamfer between the mounting surface and the upper clamping parting surface, a venting cut on the mounting surface, a venting groove on the mounting surface, and a venting groove on the side wall.

[0012] In this invention, the upper clamp is provided with a connecting hole that extends axially through the upper clamp body. A bolt passes through the connecting hole and is screwed into a threaded hole at the bottom of the mounting groove to fix the upper clamp in the mounting groove. The head of the bolt is located in the countersunk hole of the connecting hole.

[0013] In this invention, the half-exhaust area is provided with a protrusion, the protrusion corresponding to the position where the connecting hole passes through the half-exhaust area; the protrusion is configured to surround the connecting hole and to cover the half-exhaust area corresponding to the position in the axial direction.

[0014] In this invention, the upper clamping opening includes an upper clamping opening body, which includes a bottom surface, a top surface, a parting surface, and a mounting surface. The parting surface has a half-bottle neck hole at its center. The bottom surface has a venting recess, and the half-venting area is defined by the venting recess and the bottom surface of the mounting groove. The mounting surface has a venting notch, and the venting channel is defined by the venting notch and the sidewall of the mounting groove. The venting recess surrounds the half-bottle neck hole and extends to the parting surface and the venting notch, so that the half-venting area communicates with the venting channel.

[0015] A blow molding die includes a cavity structure and a bottom mold, wherein the cavity structure and the bottom mold together define the shape of a container, and the cavity structure is the aforementioned cavity structure.

[0016] The beneficial effects of the present invention are as follows: The present invention has a venting recess and a venting notch on the upper clamping opening. After being combined into a mold cavity and a blow molding die, a venting area and a venting channel are formed at the top of the mold cavity. The gas in the upper part of the mold cavity can be quickly discharged through the venting structure of the upper clamping opening, which makes it easier to form the bottle neck and bottle shoulder, and the forming of the bottle neck and bottle shoulder is more complete, effectively ensuring the blow molding efficiency and the quality of the finished product. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1;

[0019] Figure 2 for Figure 1 Enlarged view of section A;

[0020] Figure 3This is a schematic diagram of the upper clamp in Embodiment 1;

[0021] Figure 4 for Figure 3 Another structural diagram (the area enclosed by the dotted line in the attached diagram is the exhaust recess 111).

[0022] Figure 5 for Figure 4 Front view;

[0023] Figure 6 This is a schematic diagram of the structure of Example 2;

[0024] Figure 7 for Figure 6 Enlarged view of section B;

[0025] Figure 8 This is a schematic diagram of the upper clamp in Embodiment 2 (the area enclosed by the dotted line in the attached figure is the exhaust recess 111).

[0026] Figure 9 for Figure 8 Front view;

[0027] Figure 10 This is a schematic diagram of the upper clamp in Embodiment 3 (the area enclosed by the dotted line in the attached figure is the exhaust recess 111). Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," "right," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Example 1:

[0032] like Figures 1 to 5 As shown, this embodiment discloses a mold cavity structure, including two mold cavity half-molds 2 that are defined by a mold-closing mechanism, each half-mold having at least a portion of the mold cavity. Each mold cavity half-mold 2 has a mounting groove 21, within which an upper clamping opening 1 is fixedly installed. The two upper clamping openings 1 enclose a clamping portion. At least one upper clamping opening 1 and the corresponding mounting groove 21 are configured to form a half-venting area 4 and a venting channel 5. The half-venting area 4 communicates with the mold cavity and the venting channel 5, respectively, and the venting channel 5 communicates with the outside. During blow molding, some gas inside the mold cavity can be quickly discharged through the venting area 4 and the venting channel 5, making it easier to form the bottle neck and shoulder, resulting in a fuller bottle neck and shoulder, effectively ensuring blow molding efficiency and finished product quality.

[0033] In a preferred embodiment, a partial venting region 4 is formed between a portion of the bottom surface of the upper clamp 1 and a portion of the bottom surface of the mounting groove 21. The partial venting region 4 includes a venting recess 111, which can be located on the bottom surface of the upper clamp 1, the bottom surface of the mounting groove 21, or both, achieving the same venting effect.

[0034] In this embodiment, an exhaust channel 5 is formed between the mounting surface 14 of the upper clamping opening 1 and the side wall of the mounting groove 21. The exhaust channel 5 includes an exhaust notch 15 disposed on the mounting surface 14 and / or the side wall. The exhaust notch 15 includes an exhaust chamfer 151 between the mounting surface 14 and the parting surface 13 of the upper clamping opening 1, and the exhaust chamfer 151 forms the exhaust channel 5 between the exhaust chamfer 151 and the side wall of the mounting groove 21. The entire exhaust channel 5 is formed between the upper clamping opening 1 and the mounting groove 21, without the need for modifications to other positions of the mold cavity half mold 2, which facilitates the improvement of traditional molds and has a wide range of applications.

[0035] In this embodiment, the upper clamp 1 includes a sheet-shaped upper clamp body made of metal. The upper clamp body includes a bottom surface 11 facing the blow molding die body, a top surface 12 facing the outside of the blow molding die body, a parting surface 13 abutting against another upper clamp, and a mounting surface 14 contacting the blow molding die body. The center of the parting surface 13 is provided with a half-bottle neck hole 131. The bottom surface 11 is provided with a venting recess 111, the depth of which is between 0.1mm and 0.5mm. Excessive depth is avoided to minimize the impact on the forming of the container body. The mounting surface 14 is provided with a venting notch 15 that forms a vent after connection with the blow molding die. The venting recess 111 surrounds the half-bottle neck hole 131 and extends to the venting notch 15. The venting notch 15 and the side wall of the mounting groove 21 form a venting channel 5, which is connected to the outside. A chamfer 151 forming an exhaust notch 15 is provided between the parting surface 13 and the mounting surface 14. Preferably, two chamfers 151 are provided between the two ends of the parting surface 13 and the mounting surface 14, thereby forming two exhaust notches 15 to improve the exhaust speed and efficiency. Of course, only one chamfer 151 and an appropriately enlarged chamfer 151 can achieve the same technical effect. Those skilled in the art can appropriately select the corresponding structure according to the requirements of different bottle types. Preferably, the exhaust recess 111 extends to the parting surface 13 and the exhaust recess 111 extends to the exhaust chamfer 151. This surrounds the entire half of the bottle neck hole 131 inside the exhaust recess 111 to ensure rapid exhaust at the bottle neck.

[0036] In this embodiment, the upper clamp 1 is provided with a connecting hole 16 that penetrates the upper clamp body axially. A bolt passes through the connecting hole 16 and is screwed into a threaded hole at the bottom of the mounting groove 21 to fix the upper clamp 1 in the mounting groove 21. The head of the bolt is located in the countersunk hole of the connecting hole 16. When part of the connecting hole 16 is set to penetrate the venting recess 111 axially, the venting recess 111 is provided with a protrusion 112 at the position corresponding to the connecting hole 16. The protrusion 112 is configured to surround the connecting hole 16 and cover the half-venting area corresponding to the position axially. Specifically, the protrusion 112 is flush with the bottom surface 11, the connecting hole 16 penetrates the protrusion 112 axially, and the protrusion 112 contacts the bottom surface of the mounting groove 21 to ensure that the venting recess 111 of the upper clamp will not deform after fixed connection. The protrusion 112 can be machined on the bottom surface 11 of the body 1 and remain integral with the body 1; or it can be an independent gasket. Other structures within the mold cavity can be referenced in relevant patent documents filed earlier by the applicant, such as Chinese invention patent with patent application number CN201811538334.9, etc., which will not be detailed here.

[0037] Example 2:

[0038] Reference Figures 6 to 9 The structure and principle of this embodiment are basically the same as those of Embodiment 1, except that the exhaust notch 15 includes an exhaust cut 152 on the mounting surface 14, and an exhaust channel 5 is formed between the exhaust cut 152 and the side wall of the mounting groove 21. In this embodiment, the mounting surface 14 is an arc surface, and the top surface 12 has a semi-circular outline. The exhaust cut 152 is formed by cutting flat at the top of the arc of the semi-circular outline. The exhaust notch 15 is the exhaust cut 152 cut flat on the mounting surface 14. There is a gap between the exhaust cut 152 and the side wall of the mounting groove 21 to form an exhaust channel 5. The exhaust recess 111 extends radially along the half-bottle neck hole 131, extending from the half-bottle neck hole 131 to the exhaust cut 152.

[0039] Example 3:

[0040] Reference Figure 10 The structure and principle of this embodiment are basically the same as those of Embodiment 2, except that the venting notch 15 includes a venting groove 153 on the mounting surface 14, and a venting channel 5 is formed between the venting groove 153 and the side wall of the mounting groove 21. In this embodiment, the mounting surface 14 is composed of multiple planes, that is, the cross-section of the top surface 12 is rectangular or polygonal. One of the planes of the mounting surface 14 is provided with a venting groove 153 forming the venting notch 15. There is a gap between the venting groove 153 and the side wall of the mounting groove 21 to form a venting channel 5. Here, the venting groove 153 can be provided only on the side wall of the mounting groove 21, or it can be provided on both the side wall of the mounting surface 14 and the side wall of the mounting groove 21. Different choices can be made according to the different bottle types being produced.

[0041] This invention also discloses a blow molding die, including a mold cavity structure and a bottom mold, wherein the mold cavity structure and the bottom mold together define the shape of the container, and the mold cavity structure is the mold cavity structure described in any of the above embodiments. Other structures of blow molding dies can be found in the relevant domestic patents filed earlier by the applicant, and will not be described in detail here.

[0042] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by essentially the same means is within the protection scope of the present invention.

Claims

1. A mold cavity structure comprising two mold cavity halves that define at least a portion of a mold cavity by mold closing, wherein each mold cavity halves is provided with a mounting groove, and an upper clamping opening is fixedly installed within the mounting groove, the upper clamping opening forming a clamping portion, characterized in that: At least one of the upper clamping openings and the corresponding mounting slots are configured to form a half-venting area and a venting channel. The half-venting area is connected to the mold cavity and the venting channel, respectively. The venting channel is connected to the outside. Some of the gas in the mold cavity is discharged through the venting area and the venting channel.

2. The mold cavity structure according to claim 1, characterized in that: The bottom surface of the upper clamp and the bottom surface of the mounting groove are configured to form the half-exhaust area.

3. The mold cavity structure according to claim 2, characterized in that: The half-exhaust area includes an exhaust recess, which is located on the bottom surface of the upper clamp and / or the bottom surface of the mounting groove.

4. The mold cavity structure according to claim 1, characterized in that: An exhaust channel is formed between the mounting surface of the upper clamp and the side wall of the mounting groove.

5. The mold cavity structure according to claim 4, characterized in that: The exhaust passage includes an exhaust notch disposed on the mounting surface and / or the side wall.

6. The mold cavity structure according to claim 5, characterized in that: The venting notch includes at least one of the following: a venting chamfer between the mounting surface and the upper clamping parting surface, a venting cut on the mounting surface, a venting groove on the mounting surface, and a venting groove on the side wall.

7. The mold cavity structure according to claim 1, characterized in that: The upper clamp is provided with a connecting hole that extends axially through the upper clamp body. A bolt passes through the connecting hole and is screwed into a threaded hole at the bottom of the mounting groove to fix the upper clamp in the mounting groove. The head of the bolt is located in the countersunk hole of the connecting hole.

8. The mold cavity structure according to claim 7, characterized in that: The half-exhaust area is provided with a protrusion, the protrusion corresponding to the position where the connecting hole passes through the half-exhaust area; the protrusion is configured to surround the connecting hole and cover the half-exhaust area corresponding to the position in the axial direction.

9. The mold cavity structure according to claim 1, characterized in that: The upper clamp includes an upper clamp body, which includes a bottom surface, a top surface, a parting surface, and a mounting surface. The parting surface has a half-bottle neck hole at its center. The bottom surface has a venting recess, and the half-venting area is defined by the venting recess and the bottom surface of the mounting groove. The mounting surface has a venting notch, and the venting channel is defined by the venting notch and the sidewall of the mounting groove. The venting recess surrounds the half-bottle neck hole and extends to the parting surface and the venting notch, so that the half-venting area communicates with the venting channel.

10. A blow molding die, comprising a cavity structure and a bottom mold, wherein the cavity structure and the bottom mold together define the shape of a container, characterized in that, The mold cavity structure is the mold cavity structure according to any one of claims 1-9.

Images