Bottle blowing mold structure

Abstract

The utility model relates to a bottle blowing mold structure which comprises two half bottle body molds formed by 3D printing, and a bottle body cooling water path is arranged in the side wall of each half bottle body mold; the opposite surfaces of the two half bottle body molds form half bottle body forming surfaces, a liquid inlet and a liquid outlet are formed in the outer wall of each half bottle body mold, the bottle body cooling water path comprises a first water path, a snake-shaped water path and a second water path, and the snake-shaped water paths are arranged in a snake-shaped bending mode in the axial direction of the half bottle body molds; the snakelike water path comprises a plurality of curve water paths which are uniformly distributed at intervals in the axial direction of the half-bottle body mold, the length direction of each curve water path extends in the circumferential direction of the half-bottle body forming surface, every two adjacent curve water paths are connected through a corresponding connecting curve, and the distances between all positions of each curve water path and the half-bottle body forming surface are equal. The cooling uniformity and the cooling efficiency of the mold structure can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of blow molding molds, and in particular to a blow molding mold structure. Background Technology

[0002] The mold heat exchange system is crucial to the molding quality and efficiency of products, and the optimal cooling water channel structure must be designed according to the characteristics of the product. In the PET bottle blow molding process, the PET preform, in a thermoelastic state, is stretched and blow-molded into a bottle. Once the PET bottle body is tightly attached to the inner surface of the blow mold, it is cooled and shaped before the mold is opened and the bottle is removed. However, conventional blow mold cooling water channels are limited by machining processes. They typically consist of several interconnected water holes drilled with a drill bit, supplemented by a certain number of plugs and inlet / outlet pipe joints, ultimately forming a closed-loop mold cooling system. Cooling systems obtained using this method have limitations in terms of cooling uniformity and efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a blow molding die structure that can effectively improve the cooling uniformity and cooling efficiency of the die structure.

[0004] The purpose of this utility model is achieved as follows: a blow molding die structure includes two symmetrically arranged half-bottle molds formed by 3D printing. Each half-bottle mold has a bottle cooling water channel in its side wall. The opposing surfaces of the two half-bottle molds constitute half-bottle forming surfaces. Each half-bottle mold has an inlet and an outlet on its outer wall. The bottle cooling water channel includes a first water channel, a serpentine water channel, and a second water channel. The serpentine water channel is arranged in a serpentine curve along the axial direction of the half-bottle mold, with its inlet and outlet ends close to the bottom and top of the half-bottle mold, respectively. The two ends of the first water channel are connected to the inlet and the inlet of the serpentine water channel, respectively. The two ends of the second water channel are connected to the outlet and the outlet of the serpentine water channel, respectively. The serpentine water channel includes multiple curved water channels evenly spaced along the axial direction of the half-bottle mold. The length direction of each curved water channel extends circumferentially along the half-bottle forming surface. Adjacent curved water channels are connected by corresponding connecting bends. The distance between each position of each curved water channel and the half-bottle forming surface is equal.

[0005] In a preferred embodiment of this utility model, the distance between each position of the curved water channel and the half-bottle forming surface is 2-5mm.

[0006] In a preferred embodiment of this utility model, the distance between each position of the curved water channel and the half-bottle forming surface is 3mm.

[0007] In a preferred embodiment of this utility model, the channel diameters of each part in the cooling water circuit of the bottle body are all the same.

[0008] In a preferred embodiment of this utility model, the channel diameter of the cooling water channel in the bottle body is 4-10mm.

[0009] In a preferred embodiment of the present invention, the blow molding die structure further includes a mold shell, which includes two symmetrically arranged and mating half-mold shells. The two half-mold shells can enclose and form a mold cavity, and the two half-bottle molds can be installed in the mold cavity. An inlet pipe and an outlet pipe are also connected to the half-mold shells and can be sealed to the inlet and outlet respectively.

[0010] In a preferred embodiment of the present invention, the inlet and outlet are symmetrically arranged on the top two sides of the half-bottle mold; the half-mold shell is provided with an inlet mounting hole and an outlet mounting hole that are respectively aligned with the inlet and outlet, and the inlet pipe and the outlet pipe are respectively sealed and inserted into the inlet mounting hole and the outlet mounting hole.

[0011] In a preferred embodiment of the present invention, the blow molding die further includes a bottle bottom mold formed by 3D printing. The bottoms of the two half-bottle molds that fit together have bottle bottom interfaces. The bottle bottom mold can be connected to the bottle bottom interfaces and installed in the mold cavity. The bottle bottom mold is provided with bottle bottom cooling water channels.

[0012] In a preferred embodiment of the present invention, the half-mold shell is a semi-cylinder, and the mold shell also includes a support member connected to the bottom of the two half-mold shells. The two half-mold shells and the support member enclose a mold cavity. The half-bottle body mold abuts against the half-mold shell, and the support member abuts against the bottle bottom mold.

[0013] In a preferred embodiment of this utility model, the half-bottle mold is a semi-cylindrical structure formed by 3D printing technology using resin or metal materials, and both the half-mold shell and the support are metal structures.

[0014] As described above, the blow molding mold structure of this utility model has an independent set of bottle cooling water channels in each half-bottle mold, which are connected to the external water channels through an inlet and an outlet. The half-bottle mold with bottle cooling water channels is processed by using 3D printing mold additive manufacturing process, and the main part of the bottle cooling water channel is designed as a serpentine water channel. This can better cover the entire half-bottle mold with the bottle cooling water channels as much as possible, and make the distance between the water hole surface at each position in each curved water channel of the serpentine water channel and the half-bottle forming surface consistent. This can ensure more sufficient and uniform cooling, thereby greatly improving cooling efficiency and cooling quality. Attached Figure Description

[0015] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0016] Figure 1A three-dimensional schematic diagram of the two half-bottle molds in the blow molding die structure provided by this utility model.

[0017] Figure 2 The side view of the two half-bottle molds in the blow molding die structure provided by this utility model.

[0018] Figure 3 A top view of the two half-bottle molds in the blow molding die structure provided by this utility model.

[0019] Figure 4 for Figure 2 Sectional view along the middle AA.

[0020] Figure 5 This is a schematic diagram of the structure of one half of the bottle mold.

[0021] Figure 6 for Figure 5 A cross-sectional view along the middle BB.

[0022] Explanation of icon numbers:

[0023] 1. Half-bottle mold; 11. Half-mold cavity; 12. Half-bottle forming surface; 13. Liquid inlet; 14. Liquid outlet;

[0024] 2. Bottle body cooling water channel; 21. First water channel; 22. Serpentine water channel; 221. Curved water channel; 222. Connecting bend; 23. Second water channel. Detailed Implementation

[0025] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0026] like Figures 1 to 6 As shown, this application provides a blow molding die structure, including two half-bottle molds 1 formed by 3D printing and arranged symmetrically, and each half-bottle mold 1 is provided with a bottle cooling water channel 2 in the side wall.

[0027] The opposing surfaces of the two half-bottle molds 1 constitute the half-bottle forming surface 12. Each half-bottle mold 1 has an inlet 13 and an outlet 14 on its outer wall. The bottle cooling water channel 2 includes a first water channel 21, a serpentine water channel 22, and a second water channel 23. The serpentine water channel 22 is arranged in a serpentine curve along the axial direction of the half-bottle mold 1, with its inlet and outlet ends close to the bottom and top of the half-bottle mold 1, respectively. The two ends of the first water channel 21 are connected to the inlet 13 and the serpentine water channel 22, respectively. The inlet end of the second water channel 23 is connected to the outlet end of the serpentine water channel 22 and the liquid outlet 14 at both ends, respectively. The serpentine water channel 22 includes a plurality of curved water channels 221 evenly spaced along the axial direction of the half-bottle mold 1. The length direction of each curved water channel 221 extends along the circumference of the half-bottle forming surface 12. Adjacent curved water channels 221 are connected by corresponding connecting bends 222. The distance between each position of each curved water channel 221 and the half-bottle forming surface 12 is equal.

[0028] Therefore, in the blow molding die structure of this application, each half-bottle mold 1 is provided with an independent set of bottle cooling water channels 2, which are connected to the external water channels through an inlet 13 and an outlet 14. The half-bottle mold 1 with bottle cooling water channels 2 is processed by using 3D printing mold additive manufacturing process, and the main part of the bottle cooling water channel 2 is designed as a serpentine water channel 22. This can better fill the entire half-bottle mold 1 with the bottle cooling water channel 2 as much as possible, and make the distance between the surface of the water hole in each position of the curved water channel 221 in the serpentine water channel 22 and the half-bottle forming surface 12 consistent, which can ensure more sufficient and uniform cooling, thereby greatly improving cooling efficiency and cooling quality.

[0029] It can be understood that the opposing sides (i.e., the sides facing each other) of the two half-bottle molds 1 form half-cavities 11. The cavity walls of the half-cavities 11 are also the aforementioned half-bottle molding surfaces 12, used to define the outer surface of the bottle and match the contour of the bottle's outer surface. The two half-cavities 11 can be closed to form a blow molding cavity when the two half-bottle molds 1 are aligned. The specific shape of the cavity wall of the blow molding cavity depends on the actual shape of the product (plastic bottle). Figure 5 and Figure 6 The cavity wall contour shape shown is for illustrative purposes only.

[0030] The aforementioned statement that "the distance between each position of each curved water channel 221 and the half-bottle forming surface 12 is equal" does not mean absolute equality; a small error is permissible, and basic equality is sufficient. The spacing between adjacent curved water channels 221 along the axial direction of the half-bottle mold 1 is approximately equal, and each curved water channel 221 is evenly distributed along this axial direction. The curved water channels 221 change circumferentially along the half-bottle forming surface 12, following the contour of the half-bottle forming surface 12, to always maintain a minimum distance between the surface of the curved water channel 221 and the half-bottle forming surface 12 that is approximately consistent, thus achieving a rapid and uniform cooling effect. For example, when the cross-section of the bottle product is circular, the curved water channel 221 is an arc-shaped water channel. The length of the curved water channel 221 along the circumferential direction of the half-bottle forming surface 12 is determined according to actual needs, aiming to surround the half-bottle forming surface 12 as much as possible to improve cooling efficiency.

[0031] The inlet end of the curved waterway 221 located at the bottom and the outlet end of the curved waterway 221 located at the top constitute the inlet end and outlet end of the serpentine waterway 22, respectively. Figure 5 The small arrows in the intermediate cooling water channel 2 indicate the direction of water flow. The aforementioned connecting bend 222 is a U-shaped water channel to connect the corresponding ends of two adjacent curved water channels 221, thereby connecting multiple curved water channels 221 to form a serpentine shape. The first water channel 21 and the second water channel 23 mainly serve to connect the inlet 13 and the outlet 14 with the inlet and outlet ends of the corresponding curved water channels 221. The specific arrangement of the first water channel 21 and the second water channel 23 can be determined according to the actual opening position of the inlet 13 and the outlet 14. Generally, the distance between the surface of the connecting bend 222, the first water channel 21 and the second water channel 23 and the half-bottle forming surface 12 should also be kept as consistent as possible with the distance between the curved water channel 221 and the half-bottle forming surface 12 to better ensure cooling uniformity.

[0032] Optionally, the distance between each position of the curved water channel 221 and the half-bottle forming surface 12 is 2-5mm. Further, the distance between each position of the curved water channel 221 and the half-bottle forming surface 12 is 3mm to ensure cooling effect. The specific distance depends on actual cooling requirements; this embodiment is merely an example.

[0033] Alternatively, the channel diameters of all parts in the bottle cooling water channel 2 are the same, which ensures consistent pressure drop at all locations in the bottle cooling water channel 2, further facilitating uniform cooling. Generally, the channel diameter of the bottle cooling water channel 2 is 4-10 mm.

[0034] Further optionally, the blow molding die structure also includes a mold shell, which includes two symmetrically arranged and mating half-mold shells that can enclose to form a mold cavity. The two half-bottle molds 1 can be installed in the mold cavity. An inlet pipe and an outlet pipe are also connected to the half-mold shells and can be sealed to the inlet port 13 and the outlet port 14 respectively.

[0035] The entire mold shell allows the two half-bottle molds 1 to fit together, pressing them into place. The two half-mold shells surround the outer circumference of the two half-bottle molds 1. The half-bottle mold 1 is a semi-cylindrical structure formed using resin or metal materials through 3D printing technology. Both the half-mold shell and the supporting components are metal structures. Generally, the mechanical strength of the half-mold shell is greater than that of the half-bottle mold 1. By using 3D printing to fabricate the half-bottle mold 1 with the bottle cooling water channel 2, and by using a metal half-mold shell, it is not only easier to form the aforementioned bottle cooling water channel 2 within the half-bottle mold 1, but the mold shell also secures the two half-bottle molds 1, improving the structural strength of the entire blow molding mold structure and enabling the connection of the entire blow molding mold structure to the blow molding equipment.

[0036] The top of the two half-bottle molds 1 that are matched above form a blown bottle nozzle. The blown bottle nozzle connects the blown bottle forming cavity and the external space. The setting of the blown bottle nozzle facilitates the corresponding blown bottle operation on the blown bottle equipment, thereby producing a plastic bottle sample in the blown bottle forming cavity.

[0037] It is understood that the semi-molded shell has an inlet mounting hole and an outlet mounting hole that are respectively aligned with the inlet port 13 and the outlet port 14. The inlet pipe and the outlet pipe are respectively sealed and inserted into the inlet mounting hole and the outlet mounting hole. The inlet pipe and the outlet pipe can be used to connect to an external water circuit to deliver cooling water or other cooling liquids into the cooling water circuit 2 of the bottle body.

[0038] Optionally, for easier processing and connection, the inlet 13 and outlet 14 are symmetrically arranged on both sides of the top of the half-bottle mold 1. Correspondingly, the first water channel 21 extends downward from the top to the bottom of the half-bottle mold 1 along the axial direction of the half-bottle mold 1, and varies with the contour shape of the half-bottle forming surface 12. Of course, depending on actual needs, the inlet 13 and outlet 14 can also be located in other positions; this embodiment is only for illustrative purposes.

[0039] In some optional embodiments, the blow molding die also includes a bottle bottom mold formed by 3D printing, with bottle bottom interfaces formed at the bottom of the two mating half-bottle molds 1, the bottle bottom mold being able to connect with the bottle bottom interfaces and be installed in the mold cavity, and the bottle bottom mold being provided with bottle bottom cooling water channels.

[0040] The support component is also a metal structure, and the bottle bottom mold is made of resin or metal material using 3D printing technology. Since the bottom structure of PET plastic bottles is typically relatively complex, not a simple planar or curved surface, the bottle bottom mold is treated as a separate mold component. Its mating surface with the two half-bottle molds 1 is a circular structure, resulting in better sealing and reducing the risk of product leakage during the blow molding process. The main improvement of this application lies in the design of the bottle body cooling water channel 2. The specific structural form of the aforementioned bottle bottom cooling water channel can be designed according to actual needs, and this application does not limit it.

[0041] Optionally, for ease of installation and connection, the half-mold shell is a semi-cylinder. The mold shell also includes a support member connected to the bottom of the two half-mold shells. The two half-mold shells and the support member enclose a mold cavity. The half-bottle body mold abuts against the half-mold shell, and the support member abuts against the bottle bottom mold.

[0042] The connection and fixation between the specific mold shell, half-bottle body mold 1, and bottle bottom mold can adopt the connection method between the mold shell, half-bottle body mold, and bottle bottom mold mentioned in the patent with announcement number CN222290983U, which will not be elaborated here.

[0043] The above are merely illustrative embodiments of this utility model and are not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A blow molding die structure, characterized in that, It includes two half-bottle molds formed by 3D printing and arranged symmetrically, and each half-bottle mold has a bottle cooling water channel in the side wall; The opposing surfaces of the two half-bottle molds constitute the half-bottle forming surface. Each half-bottle mold has an inlet and an outlet on its outer wall. The bottle cooling water channel includes a first water channel, a serpentine water channel, and a second water channel. The serpentine water channel is arranged in a serpentine curve along the axial direction of the half-bottle mold, with its inlet and outlet ends close to the bottom and top of the half-bottle mold, respectively. The two ends of the first water channel are connected to the inlet and the inlet of the serpentine water channel, respectively. The two ends of the second water channel are connected to the outlet of the serpentine water channel and the outlet, respectively. The serpentine water channel includes multiple curved water channels evenly spaced along the axial direction of the half-bottle mold. The length direction of each curved water channel extends circumferentially along the half-bottle forming surface. Adjacent curved water channels are connected by corresponding connecting bends. The distance between each position of each curved water channel and the half-bottle forming surface is equal.

2. The blow molding die structure as described in claim 1, characterized in that, The distance between each position of the curved waterway and the half-bottle forming surface is 2-5mm.

3. The blow molding die structure as described in claim 1, characterized in that, The distance between each position of the curved waterway and the half-bottle forming surface is 3mm.

4. The blow molding die structure as described in claim 1, characterized in that, All sections of the cooling water circuit in the bottle have the same channel diameter.

5. The blow molding die structure as described in claim 4, characterized in that, The diameter of the cooling water channel in the bottle body is 4-10mm.

6. The blow molding die structure as described in claim 1, characterized in that, The blow molding die structure also includes a mold shell, which includes two symmetrically arranged and mating half-mold shells. The two half-mold shells can enclose and form a mold cavity, and the two half-bottle molds can be installed in the mold cavity. An inlet pipe and an outlet pipe are also connected to the half-mold shells and can be sealed to the inlet and outlet respectively.

7. The blow molding die structure as described in claim 6, characterized in that, The liquid inlet and the liquid outlet are symmetrically arranged on both sides of the top of the half-bottle mold; The semi-mold shell is provided with an inlet mounting hole and an outlet mounting hole that are respectively aligned with the inlet and outlet. The inlet pipe and the outlet pipe are respectively sealed and inserted into the inlet mounting hole and the outlet mounting hole.

8. The blow molding die structure as described in claim 6, characterized in that, The blow molding mold also includes a bottle bottom mold formed by 3D printing. The bottoms of the two half-bottle molds that fit together have bottle bottom interfaces. The bottle bottom mold can be connected to the bottle bottom interfaces and installed in the mold cavity. The bottle bottom mold is provided with bottle bottom cooling water channels.

9. The blow molding die structure as described in claim 8, characterized in that, The semi-mold shell is a semi-cylindrical shape. The mold shell also includes a support member connected to the bottom of the two semi-mold shells. The two semi-mold shells and the support member enclose the mold cavity. The half-bottle body mold abuts against the semi-mold shell, and the support member abuts against the bottle bottom mold.

10. The blow molding die structure as described in claim 9, characterized in that, The half-bottle mold is a semi-cylindrical structure formed by 3D printing technology using resin or metal materials. Both the half-mold shell and the support are metal structures.

Images