A molding process, a molding die and a plastic bottle

Abstract

The application discloses a plastic bottle forming process, a forming die and a plastic bottle, S1, the upper die is moved to the first forming area, and then the upper die is driven to descend and is combined with the first lower die in the first forming area; S2, the first injection molding machine works; S3, the upper die carrying the inner bottle body is moved to the coating area, and then the upper die is driven to descend; S4, the upper die is driven to move upward by the forming equipment to separate from the oil liquid of the coating area; S5, the upper die is moved to the second forming area by the forming equipment, and then the upper die is driven to descend; S6, the second injection molding machine works to perform secondary injection molding on the combined second lower die; S7, the upper die is moved to the blow molding area by the forming equipment, and then the upper die is driven to descend; S8, the inner bottle body bottom is ventilated; S9, the hollow double-layer double-color plastic bottle is formed after cooling. The upper die is driven by the forming equipment, and the upper die, the first lower die, the second lower die and the third lower die work in cooperation to realize the manufacturing of the integrated hollow double-layer double-color plastic bottle.

Description

Technical Field

[0001] This invention relates to the manufacturing process of plastic bottles, and more specifically, to a molding process, molding die, and plastic bottle. Background Technology

[0002] Bottles are generally used to hold liquids or lotions and are widely used in the cosmetics industry. Some cosmetic bottles adopt a hollow double-layer structure, that is, a transparent outer bottle and an opaque inner bottle, with a cavity formed between the inner and outer bottles to achieve a sense of layering and improve the quality of the bottle.

[0003] Currently, these types of bottles can only be designed in a split manner, that is, the outer bottle and the inner bottle are made separately and then assembled. This method requires high product precision, and the outer bottle is mostly made of glass, which is heavy and has high production costs.

[0004] Some are made by blow molding plastic parts. Although the cost is low, this method cannot form a transparent outer bottle and an opaque inner bottle structure, resulting in poor texture. Therefore, there is an urgent need to improve this method. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a molding process, molding die, and plastic bottle for plastic bottles. The molding equipment drives the upper mold to move, and the upper mold works in conjunction with the first lower mold, the second lower mold, and the third lower mold to realize the production of an integrated hollow double-layer two-color plastic bottle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a molding process for a plastic bottle, comprising the following steps:

[0007] S1. After the molding equipment moves the upper mold above the first molding area, it drives the upper mold to descend and close with the first lower mold in the first molding area.

[0008] S2. The first injection molding machine operates to inject the first lower mold after mold closing, and after cooling, the inner bottle body is formed.

[0009] S3. The molding equipment moves the upper mold carrying the inner bottle to the top of the coating area and then lowers the upper mold so that the bottle body of the inner bottle is immersed in the transparent oil in the coating area.

[0010] S4. The molding equipment moves the upper mold upward to detach from the oil in the coating area, so that an oil film is formed on the outside of the inner bottle body.

[0011] S5. After the molding equipment moves the upper mold to above the second molding area, it lowers the upper mold so that the upper mold carrying the inner bottle body closes with the second lower mold.

[0012] S6. The second injection molding machine operates to perform secondary injection molding on the second lower mold after mold closing, so as to form an outer preform outside the inner bottle body. The outer preform is separated from the bottle body of the inner bottle body by an oil film.

[0013] S7. The molding equipment moves the upper mold to above the blow molding area and then descends to allow the upper mold to close with the third lower mold.

[0014] S8. Ventilation is provided at the bottom of the inner bottle body, the outer bottle preform separates from the inner bottle body and expands outward to form the outer bottle body, and a hollow cavity is formed between the outer bottle body and the inner bottle body;

[0015] S9. After cooling, it forms a hollow double-layered, two-color plastic bottle.

[0016] Furthermore, the molding equipment includes a rotating arm, one end of which is fixed with a lifting device. The upper mold is connected to the drive end of the lifting device. The rotating arm is used to drive the upper mold to rotate, and the lifting device is used to drive the upper mold to move up and down. The first injection molding machine is located on the side of the first molding area, and the second injection molding machine is located on the side of the second molding area.

[0017] Furthermore, the oil is a transparent heat-conducting oil, the inner bottle is made of colored reinforced PP material, and the outer bottle is made of transparent conventional PP material.

[0018] A molding die for a plastic bottle includes an upper die, a first lower die, a second lower die, and a third lower die. The upper die includes an upper module, a die core fixed to the upper module, a first push rod penetrating the die core, and two first sliders slidably connected to the lower part of the upper module. The lower end of the die core extends beyond the lower part of the upper module. The die core has a first through hole inside. The first push rod is inserted into the first through hole and its lower end can block or open the lower end of the first through hole.

[0019] Furthermore, the upper module is provided with an air intake channel, and the mold core is provided with an air inlet. The air intake channel, the air inlet, and the first through hole are connected.

[0020] The upper module is fixed with two first cylinders on both sides. The two first cylinders are respectively connected to the first sliders to drive the two first sliders to abut against each other or move away from each other. When the two first sliders abut against each other, a mold cavity can be formed for the threaded opening of the injection molded plastic bottle.

[0021] The upper part of the upper module is fixed with a second cylinder, which is connected to the first push rod.

[0022] Furthermore, the first lower mold includes a first mold cavity, a first feeding channel, and a second feeding channel. The lower part of the upper mold can abut against the upper part of the first lower mold and the mold core is inserted into the first mold cavity. The first feeding channel is vertically arranged and located in the lower part of the first mold cavity. A protrusion is provided in the first feeding channel. The upper part of the protrusion is flush with the bottom of the first mold cavity. The lower end of the first ejector rod abuts against the upper part of the protrusion. The second feeding channel is horizontally arranged and one end is connected to the first feeding channel. The other end of the second feeding channel can be connected to the injection port of the first injection molding machine.

[0023] Furthermore, the second lower mold includes a second mold cavity and a third feeding channel. The lower part of the upper mold can abut against the upper part of the second lower mold and the mold core can be inserted into the first mold cavity. One end of the third feeding channel is connected to the lower part of the second mold cavity and the other end can be connected to the injection port of the second injection molding machine.

[0024] Furthermore, the third lower mold includes two second sliders that can abut or move away from each other, the two second sliders forming a third mold cavity, and the lower part of the upper mold abuts against the upper part of the second sliders and the mold core is inserted into the third mold cavity.

[0025] Furthermore, the third lower mold includes a second through hole located below the third mold cavity. A mounting groove is provided at the lower part of the second through hole. A lifting mechanism is installed inside the third lower mold. The lifting mechanism includes a second push rod and a servo motor. The second push rod passes through the second through hole. A protrusion is provided at the upper end of the second push rod, and a guide rib is provided at the lower end of the second push rod. The guide rib is located within the mounting groove. A spring is sleeved on the outside of the second push rod. The upper end of the spring abuts against the upper part of the mounting groove, and the lower end abuts against the upper part of the guide rib. The servo motor is fixed inside the third lower mold and connected to the lower part of the guide rib. The servo motor can push the second push rod upwards so that the protrusion is inserted into the bottom of the inner bottle.

[0026] A plastic bottle includes an integrally formed inner bottle body and an outer bottle body, with a hollow cavity formed between the inner bottle body and the outer bottle body. The inner bottle body includes a threaded opening and an annular rib at the lower part of the threaded opening. The outer bottle body includes a boss and a protrusion at the upper part of the boss. The upper part of the outer bottle body is connected to the lower part of the annular rib. The protrusion is embedded in the lower opening of the inner bottle body and blocks the lower opening of the inner bottle body.

[0027] In summary, the present invention has the following beneficial effects:

[0028] This embodiment utilizes two existing PP materials with different melting points for secondary injection molding and blow molding processes to produce a one-piece hollow, double-layered, two-color plastic bottle. This not only gives the bottle a good texture but also significantly reduces processing costs and the overall weight of the product, achieving a lightweight design. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0030] Figure 2 This is a cross-sectional view of the first forming zone during the forming process;

[0031] Figure 3 for Figure 2 Enlarged view at point A;

[0032] Figure 4 This is a cross-sectional view of the second forming zone during forming;

[0033] Figure 5 for Figure 4 Enlarged view at point B;

[0034] Figure 6 This is a cross-sectional view of the blow molding area during blow molding.

[0035] Figure 7 This is a cross-sectional view of the blow-molded area after blow molding;

[0036] Figure 8 for Figure 7 Enlarged view at point C;

[0037] Figure 9 This is a cross-sectional view of a plastic bottle;

[0038] Figure 10 This is an illustration of a plastic bottle.

[0039] Reference numerals: 1. Molding equipment; 11. First molding zone; 12. Coating zone; 13. Second molding zone; 14. Blow molding zone; 15. Rotating arm; 16. Lifting device; 2. Upper mold; 21. Upper module; 211. Air inlet channel; 22. Mold core; 221. First through hole; 222. Air inlet; 23. First ejector pin; 24. First slider; 25. First cylinder; 26. Second cylinder; 27. Air outlet channel; 3. First lower mold; 31. First mold cavity; 32. First feeding channel; 33. Protrusion; 34. Second feeding channel; 4. 41. Second lower mold; 42. Second mold cavity; 5. Third feed channel; 51. Third mold cavity; 52. Second through hole; 53. Mounting groove; 54. Second slider; 6. First injection molding machine; 7. Second injection molding machine; 8. Plastic bottle; 81. Inner bottle body; 811. Threaded opening; 812. Annular rib; 82. Outer bottle body; 821. Outer bottle preform; 822. Boss; 823. Protrusion; 84. Hollow cavity; 9. Lifting mechanism; 91. Second ejector rod; 911. Protrusion; 92. Guide rib; 93. Servo motor; 94. Spring. Detailed Implementation

[0040] 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.

[0041] like Figures 9 to 10 As shown, this embodiment discloses a plastic bottle, including an integrally molded inner bottle body 81 and an outer bottle body 82, with a hollow cavity 84 formed between the inner bottle body 81 and the outer bottle body 82. The inner bottle body 81 is made of colored reinforced PP material, which is made by adding materials such as bamboo fiber to conventional PP material. Reinforced PP is an existing technology with a melting point above 220°C. The outer bottle body 82 is made of transparent conventional PP material, which has a melting point of around 160°C. By using two existing PP materials with different melting points for secondary injection molding and blow molding processes, an integrally molded hollow double-layered double-color plastic bottle 8 can be produced, which not only has a good texture but also greatly reduces processing costs and the overall weight of the product, achieving a lightweight design.

[0042] like Figure 9 As shown, the inner bottle body 81 includes a threaded opening 811, and a ring rib 812 is provided at the lower part of the threaded opening 811. The upper part of the outer bottle body 82 is connected to the lower part of the ring rib 812. The bottle body of the outer bottle body 82 does not contact the inner bottle body 81. The outer bottle body 82 includes a boss 822, and a protrusion 823 is provided at the upper part of the boss 822. The protrusion 823 is embedded in the lower opening of the inner bottle body 81 and blocks the lower opening of the inner bottle body 81. During the processing of the plastic bottle 8, due to the blow molding requirements of the outer bottle body 82, an air vent 27 needs to be opened at the bottom of the inner bottle body 81. Therefore, after the outer bottle body 81 is blow molded, before the outer bottle body 81 cools and solidifies, the lower end of the outer bottle body 82 is squeezed by the lifting mechanism 9, so that the lower end deforms upward and inserts into the air vent 27. After the outer bottle body 81 is completely solidified, the protrusion 823 can block the air vent 27 to prevent the material contained in the inner bottle body 81 from leaking.

[0043] like Figure 1 As shown, the molding equipment 1 is provided with a first molding area 11, a coating area 12, a second molding area 13 and a blow molding area 14 arranged sequentially along its center. The first molding area 11 is equipped with a first lower mold 3 and a first injection molding machine 6 is installed on the outside of the first molding area 11. An oil tank (not shown in the figure) is provided in the coating area 12. The second molding area 13 is equipped with a second lower mold 4 and a second injection molding machine 7 is installed on the outside of the second molding area 13. The blow molding area 14 is equipped with a third lower mold 5.

[0044] The molding equipment 1 includes a rotating arm 15, one end of which is fixed with a lifting device 16, which is a hydraulic cylinder. The driving end of the lifting device 16 is connected to an upper mold 2. The rotating arm 15 is used to drive the upper mold 2 to rotate, and the lifting device 16 is used to drive the upper mold 2 to move up and down. Through the rotating arm 15, the upper mold 2 can be rotated along the center of the molding equipment 1 and pass over the first molding area 11, the coating area 12, the second molding area 13 and the blow molding area 14 in sequence.

[0045] like Figure 2 and Figure 3 As shown, the upper mold 2 includes an upper module 21, a mold core 22 fixed to the upper module 21, a first push rod 23 penetrating the mold core 22, and two first sliders 24 slidably connected to the lower part of the upper module 21. The upper module 21 is connected to the lifting device 16. The lower end of the mold core 22 extends beyond the lower part of the upper module 21. The two first sliders 24 are located on both sides of the mold core 22. The upper module 21 is fixed with first cylinders 25 on both sides. The two first cylinders 25 are connected to the first sliders 24 respectively, so as to drive the two first sliders 24 to abut against each other or move away from each other. When the two first sliders 24 abut against each other, a mold cavity can be formed for the threaded opening 811 of the injection molded plastic bottle 8. Since the inner bottle body 81 is provided with the threaded opening 811, the movement of the two first sliders 24 can not only realize the forming of the threaded opening 811 feature, but also realize the demolding of the feature, and ensure that the inner bottle body 81 will not detach from the upper mold 2 after forming.

[0046] The mold core 22 has a first through hole 221 inside. The first push rod 23 is inserted into the first through hole 221 and its lower end can block or open the lower end of the first through hole 221. Specifically, a second cylinder 26 is fixed on the upper part of the upper module 21. The second cylinder 26 is connected to the first push rod 23. By setting the first push rod 23, the opening at the lower end of the inner bottle 81 can be blocked during injection molding, and an air outlet channel 27 is formed in the inner bottle 81 during blow molding to ensure the flow of gas.

[0047] The upper module 21 is provided with an air inlet channel 211, and the mold core 22 is provided with an air inlet 222. The air inlet channel 211, the air inlet 222 and the first through hole 221 are connected. The end of the air inlet channel 211 is connected to the air source for external blow molding. Through the above design, the upper mold 2 has a blow molding function.

[0048] The first lower mold 3 is fixed on the upper part of the first molding area 11. The first lower mold 3 includes a first mold cavity 31, a first feeding channel 32 and a second feeding channel 34. The lower part of the upper mold 2 can abut against the upper part of the first lower mold 3 and the mold core 22 is inserted into the first mold cavity 31. The first feeding channel 32 is vertically arranged and located at the lower part of the first mold cavity 31. A protrusion 33 is provided in the first feeding channel 32. The upper part of the protrusion 33 is flush with the bottom of the first mold cavity 31. The lower end of the first ejector rod 23 abuts against the upper part of the protrusion 33. The second feeding channel 34 is horizontally arranged and one end is connected to the first feeding channel 32. The other end of the second feeding channel 34 can be connected to the injection port of the first injection molding machine 6.

[0049] When the upper mold 2 and the first lower mold 3 are closed, the lower parts of the two first sliders 24 abut against the upper part of the first lower mold 3, and the lower end of the first ejector pin 23 extends beyond the lower part of the mold core 22 and abuts against the upper part of the protrusion 33. The first mold cavity 31, the mold core 22 and the two first sliders 24 form a molding cavity for the inner bottle 81. The first feed channel 32 is connected to the molding cavity. The first injection molding machine 6 injects the reinforced PP material into the cavity for injection molding. After the molding is cooled, the upper mold 2 drives the molded inner bottle 81 to rise.

[0050] After the inner bottle 81 is cooled and formed, it is then immersed in the oil in the coating area 12 through the molding equipment 1. The oil is a transparent heat-conducting oil with a high melting point. The immersion level of the inner bottle 81 in the oil is lower than the lower part of the annular rib 812. Then the upper mold 2 drives the inner bottle 81 to rise. The oil adheres to the surface of the inner bottle 81. After standing for 30 seconds, it is quickly moved to the second molding area 13 for secondary injection molding.

[0051] like Figure 4 and Figure 5 As shown, the second lower mold 4 includes a second mold cavity 41 and a third feeding channel 42. The lower part of the upper mold 2 can abut against the upper part of the second lower mold 4 and the mold core 22 is inserted into the second mold cavity 41. One end of the third feeding channel 42 is connected to the lower part of the second mold cavity 41 and the other end can be connected to the injection port of the second injection molding machine 7.

[0052] After the upper mold 2 and the second lower mold 4 are closed, the lower parts of the two first sliders 24 abut against the upper part of the second lower mold 4. The inner bottle body 81 with an oil film on its surface is located in the second mold cavity 41. The second mold cavity 41 and the inner bottle body 81 form a molding cavity for the outer bottle preform 821. The second injection molding machine 7 injects conventional PP material into this cavity for secondary injection molding. The injection temperature in the second lower mold 4 is much lower than the melting point of the inner bottle body 81. Therefore, during injection molding, the inner bottle body 81 will only soften to a certain extent, but will not melt. After the outer bottle preform 821 is formed, most of the outer bottle preform 821 is separated from the bottle body of the inner bottle body 81 by the oil film. However, the outer bottle preform 821 located at the annular rib 812 of the inner bottle body 81 is firmly combined with the inner bottle body 81.

[0053] like Figures 6-8 As shown, after the outer preform 821 cools, it is transferred to the blow molding area 14 and placed in the third lower mold 5 for blow molding. Specifically, the third lower mold 5 includes two second sliders 54 that can abut or move away from each other. The two second sliders 54 form a third mold cavity 51. The lower part of the upper mold 2 can abut the upper part of the second sliders 54 and the mold core 22 is inserted into the third mold cavity 51. The second sliders 54 are moved by cylinders. After the mold is closed, the upper parts of the two second sliders 54 abut the lower parts of the two first sliders 24. Before blow molding, the outer preform 821 needs to be heated and softened. During blow molding, the second cylinder 26 drives the first ejector rod 23 to rise, thereby creating an internal... An air outlet channel 27 is formed at the lower end of the bottle body 81. At this time, an external air source supplies air to the upper mold 2. The gas is blown out from the air outlet channel 27 and contacts the inner surface of the bottom of the outer bottle preform 821. Due to the influence of the oil film, the contact between the outer bottle preform 821 and the inner bottle body 81 is not firm. Therefore, when the gas is blown out, it can separate the outer bottle preform 821 and the inner bottle body 81 in the oil film contact area. The outer bottle preform 821 can expand outward to form the outer bottle body 82. A hollow cavity 84 is formed between the outer bottle body 82 and the inner bottle body 81, forming a hollow double-layered two-color plastic bottle 8.

[0054] During blow molding, an air vent 27 is formed at the lower end of the inner bottle 81. Therefore, the air vent 27 needs to be blocked after blow molding. Specifically, the third lower mold 5 includes a second through hole 52, which is located below the third mold cavity 51. The lower part of the second through hole 52 is provided with an installation groove 53. A lifting mechanism 9 is installed inside the third lower mold 5. The lifting mechanism 9 includes a second push rod 91 and a servo motor 93. The second push rod 91 passes through the second through hole 52. The upper end of the second push rod 91 is provided with a protrusion 911, and the lower end of the second push rod 91 is provided with a guide rib 92. The guide rib 92 is located in the installation groove 53. A spring 94 is sleeved on the outside of the second push rod 91. The upper end of the spring 94 abuts against the upper part of the installation groove 53, and the lower end abuts against the upper part of the guide rib 92. The servo motor 93 is fixed inside the third lower mold 5 and connected to the lower part of the guide rib 92. The servo motor 93 can push the second push rod 91 to move upward so that the protrusion 911 is inserted into the bottom of the inner bottle 81.

[0055] When the blow molding is completed and the outer bottle 82 is still in a softened state before it has completely cooled down, the servo motor 93 drives the second push rod 91 to move slowly upward. The second push rod 91 abuts against and stretches the lower end of the outer bottle 82. When the second push rod 91 moves into place, it will form a structure of boss 822 and protrusion 823 at the bottom of the outer bottle 82. The protrusion 823 will be inserted into the air outlet channel 27. When the outer bottle 82 has completely cooled and solidified, the air outlet channel 27 will be blocked by the protrusion 823.

[0056] When the plastic bottle 8 is being unloaded, the two first sliders 24 move away from each other; then the upper mold 2 rises, causing the upper mold 2 to separate from the inner bottle body 81; finally, the two second sliders 54 move away from each other, allowing the plastic bottle 8 to be removed.

[0057] like Figures 1 to 10 As shown,

[0058] A molding process for a plastic bottle includes the following steps:

[0059] S1. After the molding equipment 1 moves the upper mold 2 above the first molding area 11, it drives the upper mold 2 to descend and close with the first lower mold 3 in the first molding area 11.

[0060] S2. The first injection molding machine 6 operates to inject the first lower mold 3 after mold closing, and after cooling, it forms the inner bottle body 81.

[0061] S3. After the molding equipment 1 moves the upper mold 2 carrying the inner bottle 81 above the coating area 12, it drives the upper mold 2 to descend so that the bottle body of the inner bottle 81 is immersed in the transparent oil in the coating area 12.

[0062] S4. The molding equipment 1 drives the upper mold 2 to move upward to detach from the oil in the coating area 12, so as to form an oil film on the outside of the inner bottle body 81.

[0063] S5. After the molding equipment 1 moves the upper mold 2 above the second molding area 13, it drives the upper mold 2 to descend so that the upper mold 2 carrying the inner bottle 81 closes with the second lower mold 4.

[0064] S6. The second injection molding machine 7 operates to perform secondary injection molding on the second lower mold 4 after mold closing, so as to form an outer bottle preform 821 outside the inner bottle body 81. The outer bottle preform 821 is separated from the bottle body of the inner bottle body 81 by an oil film.

[0065] S7. After the molding equipment 1 moves the upper mold 2 above the blow molding area 14, it descends to make the upper mold 2 close with the third lower mold 5.

[0066] S8. Ventilation is provided to the bottom of the inner bottle 81. The outer bottle preform 821 separates from the bottle body of the inner bottle 81 and expands outward to form the outer bottle 82. A hollow cavity 84 is formed between the outer bottle 82 and the inner bottle 81.

[0067] S9. After cooling, a hollow double-layered, two-color plastic bottle is formed.

[0068] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A molding process for a plastic bottle, characterized in that, Includes the following steps: S1. After the molding equipment (1) moves the upper mold (2) above the first molding area (11), it drives the upper mold (2) to descend and close with the first lower mold (3) in the first molding area (11); S2. The first injection molding machine (6) operates to inject the first lower mold (3) after the mold is closed, and after cooling, the inner bottle body (81) is formed. S3. The molding equipment (1) moves the upper mold (2) carrying the inner bottle (81) above the coating area (12) and then drives the upper mold (2) to descend so that the bottle body of the inner bottle (81) is immersed in the transparent oil in the coating area (12). S4. The molding equipment (1) drives the upper mold (2) to move upward to remove the oil from the coating area (12) so that an oil film is formed on the outside of the inner bottle body (81). S5. After the molding equipment (1) moves the upper mold (2) above the second molding area (13), it drives the upper mold (2) to descend so that the upper mold (2) carrying the inner bottle (81) closes with the second lower mold (4). S6. The second injection molding machine (7) operates and performs secondary injection molding on the second lower mold (4) after mold closing, so as to form an outer bottle preform (821) outside the inner bottle body (81). The outer bottle preform (821) is separated from the bottle body of the inner bottle body (81) by an oil film. S7. The molding equipment (1) moves the upper mold (2) above the blow molding area (14) and then descends so that the upper mold (2) and the third lower mold (5) can be closed. S8. Ventilate the bottom of the inner bottle (81), and separate the outer bottle preform (821) from the body of the inner bottle (81) and expand outward to form the outer bottle (82). A hollow cavity (84) is formed between the outer bottle (82) and the inner bottle (81). S9. After cooling, a hollow double-layered two-color plastic bottle is formed (8).

2. The molding process for a plastic bottle according to claim 1, characterized in that, The molding equipment (1) includes a rotating arm (15), one end of which is fixed with a lifting device (16). The upper mold (2) is connected to the driving end of the lifting device (16). The rotating arm (15) is used to drive the upper mold (2) to rotate, and the lifting device (16) is used to drive the upper mold (2) to move up and down. The first injection molding machine (6) is located on the side of the first molding area (11), and the second injection molding machine (7) is located on the side of the second molding area (13).

3. The molding process for a plastic bottle according to claim 1, characterized in that, The oil is a transparent heat-conducting oil, the inner bottle (81) is made of colored reinforced PP material, and the outer bottle (82) is made of transparent conventional PP material.

4. A molding die for a plastic bottle, applied to the molding process of a plastic bottle as described in any one of claims 1-3, characterized in that, The upper mold (2) includes an upper mold (2), a first lower mold (3), a second lower mold (4) and a third lower mold (5). The upper mold (2) includes an upper module (21), a mold core (22) fixed to the upper module (21), a first push rod (23) penetrating the mold core (22) and two first sliders (24) slidably connected to the lower part of the upper module (21). The lower end of the mold core (22) extends beyond the lower part of the upper module (21). The mold core (22) has a first through hole (221) inside. The first push rod (23) is inserted into the first through hole (221) and its lower end can block or open the lower end of the first through hole (221). The upper module (21) is provided with an air intake channel (211), and the mold core (22) is provided with an air inlet (222). The air intake channel (211), the air inlet (222) and the first through hole (221) are connected. The upper module (21) has two first cylinders (25) fixed on both sides. The two first cylinders (25) are respectively connected to the first sliders (24) to drive the two first sliders (24) to abut against each other or move away from each other. When the two first sliders (24) abut against each other, a mold cavity can be formed for the threaded opening (811) of the injection molded plastic bottle (8). The upper module (21) is fixed with a second cylinder (26), which is connected to the first push rod (23); The first lower mold (3) includes a first mold cavity (31), a first feeding channel (32) and a second feeding channel (34). The lower part of the upper mold (2) can abut against the upper part of the first lower mold (3) and the mold core (22) is inserted into the first mold cavity (31). The first feeding channel (32) is vertically arranged and located at the lower part of the first mold cavity (31). A protrusion (33) is provided in the first feeding channel (32). The upper part of the protrusion (33) is flush with the bottom of the first mold cavity (31). The lower end of the first ejector rod (23) abuts against the upper part of the protrusion (33). The second feeding channel (34) is horizontally arranged and one end is connected to the first feeding channel (32). The other end of the second feeding channel (34) can be connected to the injection port of the first injection molding machine (6). The second lower mold (4) includes a second mold cavity (41) and a third feeding channel (42). The lower part of the upper mold (2) can abut against the upper part of the second lower mold (4) and the mold core (22) is inserted into the second mold cavity (41). One end of the third feeding channel (42) is connected to the lower part of the second mold cavity (41) and the other end can be connected to the injection port of the second injection molding machine (7). The third lower mold (5) includes two second sliders (54) that can abut or move away from each other, the two second sliders (54) form a third mold cavity (51), the lower part of the upper mold (2) can abut the upper part of the second sliders (54) and the mold core (22) is inserted into the third mold cavity (51); The third lower mold (5) also includes a second through hole (52), which is located below the third mold cavity (51). A lifting mechanism (9) is installed inside the third lower mold (5). The lifting mechanism (9) includes a second push rod (91) and a servo motor (93). The second push rod (91) passes through the second through hole (52). The upper end of the second push rod (91) is provided with a protrusion (911). The servo motor (93) can push the second push rod (91) to move upward so that the protrusion (911) is inserted into the bottom of the inner bottle (81).

5. The molding die for a plastic bottle according to claim 4, characterized in that, The second through hole (52) is provided with a mounting groove (53) at the lower part, and the second push rod (91) is provided with a guide rib (92) at the lower end. The guide rib (92) is located in the mounting groove (53). The second push rod (91) is sleeved with a spring (94). The upper end of the spring (94) abuts against the upper part of the mounting groove (53) and the lower end abuts against the upper part of the guide rib (92). The servo motor (93) is fixed in the third lower mold (5) and connected to the lower part of the guide rib (92).

6. A plastic bottle, manufactured using the molding process described in any one of claims 1-3, characterized in that, The device includes an integrally formed inner bottle (81) and an outer bottle (82), with a hollow cavity (84) formed between the inner bottle (81) and the outer bottle (82). The inner bottle (81) includes a threaded opening (811), and an annular rib (812) is provided at the lower part of the threaded opening (811). The outer bottle (82) includes a boss (822), and a protrusion (823) is provided at the upper part of the boss (822). The upper part of the outer bottle (82) is connected to the lower part of the annular rib (812). The protrusion (823) is embedded in the lower opening of the inner bottle (81) and blocks the lower opening of the inner bottle (81).

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