Bottle cap secondary forming structure and method of plastic bottle

Abstract

The invention relates to the technical field of plastic bottle cap preparation, in particular to a secondary forming structure and method for a bottle cap of a plastic bottle, the secondary forming structure comprises a bottle cap body, a fixing ring, a connecting piece and a tearing belt, the connecting piece is arranged on one side of the bottle cap body and used for connecting the bottle cap body with the fixing ring, and the tearing belt is arranged on the fixing ring; the face, opposite to the fixing ring, of the bottle cap body is provided with a first connecting groove, the face, opposite to the first connecting groove, of the fixing ring is provided with a second connecting groove, the two ends of the tearing belt are provided with a first embedded end and a second embedded end respectively, the first embedded end is embedded in the first connecting groove, and the second embedded end is embedded in the second connecting groove. The tearing belt comprises a forming inner layer, a fiber belt and a forming outer layer, and the forming outer layer and the forming inner layer are subjected to secondary injection molding to wrap the fiber belt. The outer diameter of the forming inner layer is coated with the fiber belt, so that the impact resistance and the wear resistance of the bottle cap are enhanced, and the tearing belt can be prevented from being broken in the tearing process.

Description

Technical Field

[0001] The invention relates to the technical field of plastic bottle cap preparation, and in particular to a secondary molding structure and method for a plastic bottle cap. Background Art

[0002] Plastic bottle caps are a common packaging form for bottles, cans, and barrels, and are particularly widely used in the fields of beverages, chemicals, and medicine. According to their uses, plastic bottle caps can be divided into breathable plastic caps and non-breathable plastic caps. Breathable plastic caps are usually used for products that require exhaust, such as carbonated beverage bottles; while non-breathable plastic caps are mainly used for products that need to maintain sealing, such as mineral water and juice. The main raw materials for plastic bottle caps are polyolefins, such as polypropylene (PP) and high-density polyethylene (HDPE). These raw materials have excellent physical and chemical properties and can meet the requirements of bottle caps for strength, heat resistance, chemical corrosion resistance, etc.

[0003] The preparation process of plastic bottle caps mainly includes raw material preparation, pretreatment, plasticization, molding, post-treatment, etc. However, the existing plastic bottle caps have poor stability in actual use, especially the bottle caps with tear strips, and the tear strips are often prone to breakage. Therefore, new improvements are needed for the existing plastic bottle cap preparation. Summary of the invention

[0004] To solve the above problems, the present invention coats the outer diameter of the molded inner layer with a fiber tape, which not only enhances the impact resistance and wear resistance of the bottle cap, but also can prevent the tear tape from breaking during the tearing process to provide a secondary molding structure and method for the bottle cap of a plastic bottle.

[0005] The technical solution adopted by the present invention is: a secondary molding structure of a bottle cap for a plastic bottle, comprising a bottle cap body, a fixing ring, a connecting piece and a tear tape, the inner diameter of the bottle cap body is provided with a sealing connection part, the sealing connection part is used to connect the bottle mouth of the plastic bottle, the connecting piece is arranged on one side of the bottle cap body, and is used to connect the bottle cap body with the fixing ring, the side of the bottle cap body opposite to the fixing ring is provided with a first connecting groove, the side of the fixing ring opposite to the first connecting groove is provided with a second connecting groove, the tear tape connects the bottle cap body with the fixing ring through secondary molding, the two ends of the tear tape are respectively provided with a first embedded end and a second embedded end, the first embedded end is embedded in the first connecting groove, and the second embedded end is embedded in the second connecting groove, so that the tear tape connects the bottle cap body with the fixing ring; the tear tape comprises a molded inner layer, a fiber tape and a molded outer layer, the molded outer layer and the molded inner side are divided into secondary injection molding to cover the fiber tape.

[0006] A further improvement to the above scheme is that the bottle cap body is integrally injection molded with the fixing ring through a connecting piece, and a first flat portion and a second flat portion are respectively provided at both ends of the connecting piece, the first flat portion is used to connect the bottle cap body, and the second flat portion is used to connect the fixing ring.

[0007] A further improvement to the above scheme is that it also includes a bottle mouth, which includes a bottle cap connecting part and a fixed connecting part, the bottle cap connecting part is used to install the bottle cap body, the fixed connecting part is used to install the fixing ring, and the bottle cap connecting part is provided with a sealing matching part, which is used to cooperate with the sealing connecting part to seal the bottle mouth.

[0008] A further improvement to the above scheme is that the sealing connection part is a sealing connection buckle, and the sealing matching part is a sealing connection slot; the sealing connection buckle includes an introduction section, a clamping section and a sealing connection section, the introduction section is used to guide the sealing matching part toward the clamping section, the clamping section is used to be clamped on the sealing connection slot, and the sealing connection section is used to abut one side of the sealing slot.

[0009] A further improvement to the above solution is that a metal sheet is pre-embedded in the connecting sheet, the connecting sheet is coated with the metal sheet by injection molding, one end of the metal sheet extends to the first flat portion, and the other end extends to the second flat portion.

[0010] A further improvement to the above solution is that the metal sheet is a memory metal sheet, which is in a U-shape at room temperature and in a straight shape at high temperature.

[0011] A further improvement to the above scheme is that a placement groove is provided in the tear tape, and the fiber tape is arranged in the placement groove; a tearing handle is provided at one end of the tear tape, one end of the placement groove is connected to the tearing handle, and one end of the fiber tape extends to the tearing handle.

[0012] A further improvement to the above solution is that a plurality of through holes are provided on the fiber belt, and the molded inner layer and the molded outer layer are connected through the through holes.

[0013] A bottle cap secondary molding method, comprising the bottle cap secondary molding structure of the plastic bottle; The bottle cap secondary molding method is implemented by a secondary molding device, which includes a conveyor line, a molding mold, a pre-embedded mechanism, an injection molding mechanism, a pre-demolding mechanism, a primary molding mechanism, a fiber belt coating mechanism and a secondary molding mechanism; the molding mold is arranged on the conveyor line, and the conveyor line is used to drive the molding mold to pass through the pre-embedded mechanism, the injection molding mechanism, the pre-demolding mechanism, the primary molding mechanism, the fiber belt coating mechanism and the secondary molding mechanism in sequence; the molding mold is provided with a bottle cap molding groove and a fixing groove, and an injection molding connecting groove is provided between the fixing groove and the bottle cap molding groove.

[0014] The bottle cap secondary molding method comprises the following steps: Step S1, pre-embedding of metal parts: the forming mold is transported on the conveyor line, and when entering the pre-embedding mechanism, it is positioned on the conveyor line, and then the pre-embedding mechanism is used to pre-embed the metal sheet on the injection molding connection groove, and the injection molding connection groove has a positioning step for positioning the metal sheet; Step S2, injection molding: after the metal sheet is pre-embedded, the forming mold is then transported to the injection molding mechanism through the conveyor line, the injection molding mechanism closes the forming mold, and after closing the mold, the forming mold is injection molded to form the bottle cap body, the fixing ring and the connecting piece on the forming mold, and the connecting piece covers the metal sheet. During the injection molding, the forming mold is preheated so that the metal sheet is straight after being exposed to high temperature, and the metal sheet is covered by the connecting piece after injection molding; Step S3, demolding the fixing ring: after the injection molding is completed, the conveyor line conveys the molding mold to the pre-demolding mechanism, which is used to demold the fixing ring. At this time, the metal sheet cools during the conveying process and returns to the U shape after cooling, so that the fixing ring is opposite to the bottle cap and the bottle body; Step S4, one-step molding: after the fixed ring is demolded, the molding mold is transported to the one-step molding mechanism through the conveyor line. The one-step molding mechanism is provided with a one-step clamping assembly. The molding mold is clamped by the one-step clamping assembly, and then injection molding is performed to injection-mold the inner layer between the bottle cap body and the fixed ring. The two ends of the molded inner layer form a first embedded end and a second embedded end. The first embedded end is embedded in the first connecting groove, and the second embedded end is embedded in the second connecting groove. Step S5, fiber tape coating: after the injection molding of the molding inner layer by the primary molding mechanism is completed, the molding mold is transported toward the fiber tape coating mechanism through the conveyor line, and the fiber tape coating mechanism coats the fiber tape on the outer diameter of the molding inner layer; Step S6, secondary molding: The secondary molding mechanism is provided with a secondary mold assembly. After the fiber tape is coated, the secondary mold assembly is molded by the secondary molding mechanism, and then injection molding is performed to mold the outer layer. After molding, the bottle cap is prepared by waiting for cooling and setting.

[0015] A further improvement to the above scheme is that a plurality of positioning components are arranged on the conveyor line, and the positioning components are used for positioning the molding mold so as to position the corresponding injection molding mechanism, embedded mechanism, pre-demolding mechanism, primary molding mechanism, pre-demolding mechanism and secondary molding mechanism during processing.

[0016] A further improvement to the above scheme is that the embedded mechanism is manually embedded or automatically embedded, and the embedded mechanism includes a feed tray and an automatic material picking robot. The feed tray is used for feeding metal sheets, and the material picking robot is used to grab the metal sheets from the feed tray and then place them on the molding mold.

[0017] A further improvement to the above scheme is that the injection molding mechanism includes an injection mold, an injection molding component and an injection mold clamping drive component, and the injection mold clamping drive component is used to drive the injection mold and the molding mold to clamp, and after the clamping, the injection molding component is used to inject the molding mold.

[0018] A further improvement to the above scheme is that the pre-demolding mechanism includes a pre-demolding bracket, a pre-demolding drive assembly, a pre-demolding clamping assembly and a pre-demolding material picking assembly, the pre-demolding clamping assembly and the pre-demolding material picking assembly are both arranged on the pre-demolding drive assembly, and the pre-demolding drive assembly is arranged on the pre-demolding bracket; the pre-demolding material picking assembly is used for fixing the ring to pick up materials and demold from the molding mold.

[0019] A further improvement to the above scheme is that the primary molding mechanism includes a first molding drive module and a first molding injection module, the driving end of the first molding drive module is connected to the primary mold clamping assembly, and the first molding injection module is arranged on the primary mold clamping assembly.

[0020] A further improvement to the above scheme is that the fiber band wrapping mechanism includes a wrapping fixing roller, a wrapping fixing frame and a wrapping driving module, the wrapping fixing roller is arranged on the wrapping fixing frame, the wrapping driving module is used to drive the wrapping fixing frame to move toward the forming mold, and the wrapping fixing frame is used to fix the fiber band.

[0021] A further improvement to the above scheme is that the secondary molding mechanism includes a second molding drive module and a second molding injection module, the driving end of the second molding drive module is connected to the secondary mold clamping assembly, and the second molding injection module is arranged on the secondary mold clamping assembly.

[0022] The beneficial effects of the present invention are: Compared with the existing bottle caps, the arrangement of the bottle cap body and the sealing connection part of the present invention ensures the tight connection and effective sealing of the bottle mouth of the plastic bottle. The sealing connection part is specially designed to form a good match with the bottle mouth, effectively prevent liquid leakage, and ensure the sealing performance of the product. Not only does it extend the shelf life of the product, but it also avoids environmental pollution and consumer inconvenience caused by leakage. Secondly, the innovative use of the connecting piece and the fixing ring further enhances the stability and reliability of the bottle cap. The connecting piece serves as a bridge between the bottle cap body and the fixing ring. Through reasonable layout and structural design, the connection between the two is made more firm. The presence of the fixing ring provides additional support and protection, effectively preventing the bottle cap from falling off or being damaged due to external forces during transportation or use. This design not only improves the overall strength of the bottle cap, but also brings consumers a more secure use experience. The introduction of the tear tape is a highlight of the structure. Through the secondary molding technology, the tear tape tightly connects the bottle cap body and the fixing ring together, which not only ensures the firmness of the connection, but also facilitates users to easily separate when needed. The two ends of the tear tape are respectively embedded in the first connecting groove and the second connecting groove. This design makes the tearing process smoother and less likely to break. At the same time, the material and structural design of the tear tape also fully consider the user's operating experience, ensuring the comfort and convenience during the tearing process. In addition, the internal structure of the tear tape consists of three parts: a molded inner layer, a fiber tape and a molded outer layer, and the fiber tape is tightly wrapped by secondary injection molding technology. Not only does it improve the overall strength and toughness of the tear tape, but it also has good wear resistance and tear resistance. The addition of the fiber tape further enhances the tensile strength and impact resistance of the tear tape, so that the bottle cap can maintain the integrity of the structure when facing external force impact. The present invention realizes the close connection between the bottle cap and the bottle mouth, the stable and reliable structure, and the convenience and comfort of the user operation. These technical effects not only enhance the market competitiveness and brand value of the product, but also bring consumers a safer, more convenient and efficient use experience.

[0023] The bottle cap secondary molding method provides a solid foundation for subsequent injection molding by accurately pre-embedding a metal sheet on the injection connection groove of the molding mold and using a positioning step to ensure the accurate placement of the metal sheet. This step not only enhances the structural strength of the bottle cap, but also ensures the close combination of the metal parts and the plastic part, improving the overall durability and sealing performance. The molding mold is preheated before injection molding, so that the pre-embedded metal sheet is in a straight state at high temperature, which is convenient for the connection sheet to evenly cover it during injection molding, effectively avoiding the problem that the metal sheet affects the quality of the bottle cap due to cooling deformation. At the same time, this step also ensures the uniform distribution and rapid cooling of the injection molding material, and improves the precision and efficiency of bottle cap molding. The early demolding of the fixing ring is achieved through the pre-demolding mechanism, which not only simplifies the subsequent processing flow, but also utilizes the characteristic of the metal sheet to restore the U shape after cooling, automatically adjusts the relative position of the fixing ring and the bottle cap body, and ensures the stability and aesthetics of the bottle cap structure. In the primary molding stage, the molding mold is accurately clamped by a primary clamping assembly, and the inner layer is injection molded between the bottle cap body and the fixing ring, which enhances the overall structural strength of the bottle cap. The first embedded end and the second embedded end formed at both ends of the inner layer are respectively embedded in the first connecting groove and the second connecting groove, further improving the stability of the structure and the reliability of the connection. Coating the fiber tape on the outer diameter of the molded inner layer not only enhances the impact resistance and wear resistance of the bottle cap, but also prevents the tear tape from breaking during the tearing process. The secondary molding mechanism performs mold closing injection molding through the secondary mold closing assembly to form the outer layer of the bottle cap, ensuring the smoothness and aesthetics of the bottle cap surface. At the same time, the molding of the outer layer further consolidates the overall structure of the bottle cap and improves its deformation resistance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the secondary molding structure of the bottle cap of the plastic bottle of the present invention; Figure 2 for Figure 1 Explosion diagram of the secondary molding structure of the bottle cap of the medium plastic bottle; Figure 3 for Figure 1 A top view of the secondary molding structure of the bottle cap of the medium plastic bottle; Figure 4 for Figure 3 Sectional view of AA in the middle; Figure 5 for Figure 4 A is an enlarged schematic diagram; Figure 6 for Figure 1 A schematic structural diagram of another embodiment of a secondary molding structure for a bottle cap of a medium plastic bottle; Figure 7 for Figure 1 Schematic diagram of the preparation process of the secondary molding structure of the bottle cap of the medium plastic bottle; Figure 8 It is a structural schematic diagram of the secondary molding equipment of the present invention; Fig. 9 for Figure 8 A schematic top view of the secondary molding equipment; Fig.10 for Figure 8 A three-dimensional schematic diagram of another perspective of the secondary molding equipment; Fig.11 for Fig.10 A is an enlarged schematic diagram; Fig.12 for Fig.10 The enlarged schematic diagram of point B in FIG. Fig.13 The figure is a flow chart of the secondary molding process of the plastic bottle cap of the present invention.

[0025] Description of reference numerals: bottle cap body 10, sealing connection portion 101, introduction section 1011, clamping section 1012, sealing connection section 1013, first connection groove 102, fixing ring 20, second connection groove 201, connecting sheet 30, first flat portion 301, metal sheet 303, second flat portion 302, tearing tape 40, first embedded end 401, second embedded end 402, molded inner layer 403, fiber tape 404, molded outer layer 405, tear-off handle 406, bottle mouth 50, bottle cap connection portion 501, fixed connection portion 502, sealing matching portion 503; Conveyor line 1, positioning component 11, molding mold 2, embedded mechanism 3, feed tray 31, automatic material picking robot 32, injection molding mechanism 4, injection mold 41, injection molding component 42, injection mold clamping drive component 43, pre-demolding mechanism 5, pre-demolding bracket 51, pre-demolding drive component 52, pre-demolding clamping component 53, pre-demolding material picking component 54, primary molding mechanism 6, first molding drive module 61, first molding injection module 62, primary clamping component 63, fiber belt coating mechanism 7, coating fixed roller 71, coating fixed frame 72, coating drive module 73, secondary molding mechanism 8, second molding drive module 81, second molding injection module 82, secondary clamping component 83. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Figure 1 to Figure 13As shown, in one embodiment of the present invention, a secondary molding structure of a bottle cap for a plastic bottle is involved, comprising a bottle cap body 10, a fixing ring 20, a connecting piece 30 and a tear tape 40, wherein the inner diameter of the bottle cap body 10 is provided with a sealing connection portion 101, wherein the sealing connection portion 101 is used to connect the bottle mouth of the plastic bottle, wherein the connecting piece 30 is provided on one side of the bottle cap body 10 and is used to connect the bottle cap body 10 with the fixing ring 20, wherein a first connecting groove 102 is provided on a side of the bottle cap body 10 opposite to the fixing ring 20, and a second connecting groove 102 is provided on a side of the fixing ring 20 opposite to the first connecting groove 102. The second connection groove 201, the tear tape 40 connects the bottle cap body 10 with the fixing ring 20 through secondary molding, and the two ends of the tear tape 40 are respectively provided with a first embedded end 401 and a second embedded end 402, the first embedded end 401 is embedded in the first connection groove 102, and the second embedded end 402 is embedded in the second connection groove 201, so that the tear tape 40 connects the bottle cap body 10 with the fixing ring 20; the tear tape 40 includes a molded inner layer 403, a fiber belt 404 and a molded outer layer 405, and the molded outer layer 405 and the molded inner side are divided into secondary injection molding to cover the fiber belt 404. In this embodiment, the setting of the bottle cap body 10 and the sealing connection part 101 ensures the close connection and effective sealing of the bottle mouth of the plastic bottle. The sealing connection part 101 is specially designed to form a good match with the bottle mouth, effectively prevent liquid leakage, and ensure the sealing performance of the product. Not only does it extend the shelf life of the product, but it also avoids environmental pollution and consumer inconvenience caused by leakage. Secondly, the innovative use of the connecting piece 30 and the fixing ring 20 further enhances the stability and reliability of the bottle cap. The connecting piece 30 serves as a bridge between the bottle cap body 10 and the fixing ring 20. Through reasonable layout and structural design, the connection between the two is made more secure. The existence of the fixing ring 20 provides additional support and protection, effectively preventing the bottle cap from falling off or being damaged due to external forces during transportation or use. This design not only improves the overall strength of the bottle cap, but also brings consumers a more reassuring user experience. The introduction of the tear tape 40 is a highlight of the structure. Through the secondary molding technology, the tear tape 40 tightly connects the bottle cap body 10 and the fixing ring 20 together, which not only ensures the firmness of the connection, but also facilitates the user to easily separate when needed. The two ends of the tear tape 40 are respectively embedded in the first connecting groove 102 and the second connecting groove 201. This design makes the tearing process smoother and not easy to break. At the same time, the material and structural design of the tear tape 40 also fully consider the user's operating experience, ensuring the comfort and convenience during the tearing process. In addition, the internal structure of the tear tape 40 is composed of a molded inner layer 403, a fiber tape 404 and a molded outer layer 405. The fiber tape 404 is tightly coated by secondary injection molding technology, which not only improves the overall strength and toughness of the tear tape 40, but also makes it have good wear resistance and tear resistance.The addition of the fiber tape 404 further enhances the tensile strength and impact resistance of the tear tape 40, so that the bottle cap can maintain structural integrity when facing external force impact. The present invention achieves a tight connection between the bottle cap and the bottle mouth, a stable and reliable structure, and convenient and comfortable operation for users. These technical effects not only enhance the market competitiveness and brand value of the product, but also bring consumers a safer, more convenient, and more efficient use experience.

[0029] The bottle cap body 10 is integrally injection molded with the fixing ring 20 through the connecting piece 30, and the two ends of the connecting piece 30 are respectively provided with a first flat portion 301 and a second flat portion 302, wherein the first flat portion 301 is used to connect the bottle cap body 10, and the second flat portion 302 is used to connect the fixing ring 20. Specifically, a metal sheet 303 is embedded in the connecting piece 30, and the connecting piece 30 covers the metal sheet 303 by injection molding, and one end of the metal sheet 303 extends to the first flat portion 301 and the other end extends to the second flat portion 302; the metal sheet 303 is a memory metal sheet 303, and the normal temperature state of the memory metal sheet 303 is a U-shape, and the high temperature state is a straight shape. In this embodiment, the first flat portion 301 and the second flat portion 302 are respectively provided at the two ends of the connecting piece 30, and this structure not only ensures the stable connection between the bottle cap body 10 and the fixing ring 20, but also greatly improves the overall structural strength. More importantly, the memory metal sheet 303 is in a U shape at room temperature, which provides good elasticity and toughness for the connecting sheet 30, so that the bottle cap can maintain structural stability and integrity when subjected to external forces. During the high-temperature injection molding process, the memory metal sheet 303 becomes straight, which is convenient for being coated with plastic, thereby achieving a perfect fusion of metal and plastic. In addition, this feature of the memory metal sheet 303 also enables the bottle cap to quickly return to a preset shape after molding, further enhancing its durability and reliability. In general, this bottle cap secondary molding structure not only improves the overall performance of the bottle cap through the innovative design of the connecting sheet 30 and the application of the memory metal sheet 303, but also meets the market demand for high-quality and high-reliability bottle cap products.

[0030] The bottle mouth 50 is also included, and the bottle mouth 50 includes a bottle cap connection part 501 and a fixed connection part 502. The bottle cap connection part 501 is used to install the bottle cap body 10, and the fixed connection part 502 is used to install the fixing ring 20. The bottle cap connection part 501 is provided with a sealing matching part 503, and the sealing matching part 503 is used to match the sealing connection part 101 to seal the bottle mouth 50. Specifically, the sealing connection part 101 is a sealing connection buckle, and the sealing matching part 503 is a sealing connection slot; the sealing connection buckle includes an introduction section 1011, a clamping section 1012 and a sealing connection section 1013, the introduction section 1011 is used to guide the sealing matching part 503 toward the clamping section 1012, the clamping section 1012 is used to be clamped on the sealing connection slot, and the sealing connection section 1013 is used to abut against one side of the sealing slot. In the present embodiment, the precise docking of the bottle cap connecting portion 501 with the bottle cap body 10 ensures the stable installation of the bottle cap and effectively prevents the liquid leakage problem caused by the loosening of the bottle cap. At the same time, the setting of the fixed connecting portion 502 provides a reliable support point for installing the fixing ring 20, further enhancing the sealing and stability of the bottle cap. The ingenious cooperation of the sealing matching portion 503 and the sealing connecting portion 101, especially the precise design of the sealing connection buckle and the sealing connection slot, enables the bottle mouth 50 to reach a higher sealing standard during the sealing process. The guiding effect of the introduction section 1011 enables the sealing matching portion 503 to smoothly enter the clamping section 1012, and the clamping function of the clamping section 1012 ensures the tight connection between the sealing connecting portion 101 and the sealing matching portion 503. In addition, the abutment design of the sealing connecting section 1013 effectively prevents the invasion of external air or liquid, thereby ensuring the freshness and safety of the liquid in the bottle. This design not only improves the overall performance of the bottle cap, but also extends the shelf life of the product, providing consumers with a better user experience.

[0031] The tearing tape 40 is provided with a placement groove, and the fiber tape 404 is arranged in the placement groove; a tearing handle 406 is provided at one end of the tearing tape 40, one end of the placement groove is connected to the tearing handle 406, and one end of the fiber tape 404 extends to the tearing handle 406. Specifically, a plurality of through holes are provided on the fiber tape 404, and the molded inner layer 403 and the molded outer layer 405 are connected through the through holes. In this embodiment, by cleverly placing the fiber tape 404 in the placement groove of the tearing tape 40, not only the compactness and stability of the structure are ensured, but also the convenience of user operation is greatly improved. The tearing handle 406 design at one end of the tearing tape 40 enables the user to easily grasp and tear off the tearing tape 40, thereby realizing quick access or adjustment to the internal structure of the bottle cap. The plurality of through holes provided on the fiber tape allow a stable connection to be established between the molded inner layer 403 and the molded outer layer 405, ensuring the structural integrity and sealing performance of the bottle cap during the secondary molding process. At the same time, the presence of the through hole also facilitates the pulling or fixing of the inside of the bottle cap by the fiber belt 404 when necessary, thereby improving the flexibility and controllability during the processing.

[0032] The invention discloses a bottle cap secondary molding method, comprising a bottle cap secondary molding structure for a plastic bottle.

[0033] See also Figure 8~Figure 13 As shown, the bottle cap secondary molding method is implemented by a secondary molding device, and the secondary molding device includes a conveyor line 1, a molding mold 2, a pre-embedded mechanism 3, an injection molding mechanism 4, a pre-demolding mechanism 5, a primary molding mechanism 6, a fiber belt coating mechanism 7 and a secondary molding mechanism 8; the molding mold 2 is arranged on the conveyor line 1, and the conveyor line 1 is used to drive the molding mold 2 to pass through the pre-embedded mechanism 3, the injection molding mechanism 4, the pre-demolding mechanism 5, the primary molding mechanism 6, the fiber belt coating mechanism 7 and the secondary molding mechanism 8 in sequence; the molding mold 2 is provided with a bottle cap molding groove and a fixing groove, and an injection molding connecting groove is provided between the fixing groove and the bottle cap molding groove; The bottle cap secondary molding method comprises the following steps: Step S1, pre-embedding of metal parts: the forming mold 2 is transported on the conveyor line 1, and when entering the pre-embedding mechanism 3, it is positioned on the conveyor line 1, and then the pre-embedding mechanism 3 is used to pre-embed the metal sheet on the injection molding connection groove, and the injection molding connection groove has a positioning step for positioning the metal sheet; Step S2, injection molding: after the metal sheet is pre-embedded, the forming mold 2 is then conveyed to the injection molding mechanism 4 through the conveyor line 1, and the injection molding mechanism 4 closes the forming mold 2. After the mold is closed, the forming mold 2 is injection molded to form the bottle cap body, the fixing ring and the connecting piece on the forming mold 2. The connecting piece covers the metal sheet. During the injection molding, the forming mold 2 is preheated so that the metal sheet is straight after being exposed to high temperature, and the metal sheet is covered by the connecting piece after injection molding; Step S3, demolding the fixing ring: after the injection molding is completed, the conveyor line 1 conveys the molding mold 2 to the pre-demolding mechanism 5, and the pre-demolding mechanism 5 is used to demold the fixing ring. At this time, the metal sheet cools during the conveying process and returns to the U shape after cooling, so that the fixing ring is opposite to the bottle cap and the bottle body; Step S4, one-step molding: after the fixed ring is demolded, the molding mold 2 is transported to the one-step molding mechanism 6 through the conveyor line 1. The one-step molding mechanism 6 is provided with a one-step clamping assembly 63. The molding mold 2 is clamped by the one-step clamping assembly 63, and then injection molding is performed to form an inner layer between the bottle cap body and the fixed ring. The two ends of the molded inner layer form a first embedded end and a second embedded end. The first embedded end is embedded in the first connecting groove, and the second embedded end is embedded in the second connecting groove. Step S5, fiber tape coating: after the injection molding of the molding inner layer by the primary molding mechanism 6 is completed, the molding mold 2 is transported toward the fiber tape coating mechanism 7 through the conveyor line 1, and the fiber tape coating mechanism 7 coats the fiber tape on the outer diameter of the molding inner layer; Step S6, secondary molding: The secondary molding mechanism 8 is provided with a secondary mold assembly 83. After the fiber tape is coated, the secondary mold assembly 83 is molded by the secondary molding mechanism 8, and then injection molding is performed to mold the outer layer. After molding, the bottle cap is prepared by waiting for cooling and setting.

[0034] This embodiment provides a solid foundation for subsequent injection molding by accurately pre-embedding the metal sheet 303 on the injection connection groove of the forming mold 2 and using the positioning step to ensure the accurate placement of the metal sheet 303. This step not only enhances the structural strength of the bottle cap, but also ensures the close combination of the metal parts and the plastic part, and improves the overall durability and sealing performance. The forming mold 2 is preheated before injection molding, so that the pre-embedded metal sheet 303 is in a straight state at high temperature, which is convenient for the connection sheet 30 to evenly cover it during injection molding, and effectively avoids the problem that the metal sheet 303 affects the quality of the bottle cap due to cooling deformation. At the same time, this step also ensures the uniform distribution and rapid cooling of the injection molding material, and improves the precision and efficiency of the bottle cap molding. The early demolding of the fixing ring 20 is realized by the pre-stripping mechanism 5, which not only simplifies the subsequent processing flow, but also utilizes the characteristic of the metal sheet 303 to restore the U-shape after cooling, and automatically adjusts the relative position of the fixing ring 20 and the bottle body of the bottle cap, ensuring the stability and aesthetics of the bottle cap structure. In the primary molding stage, the molding die 2 is precisely molded by the primary mold assembly 63, and the inner layer 403 is injection molded between the bottle cap body 10 and the fixing ring 20, thereby enhancing the overall structural strength of the bottle cap. The first embedded end 401 and the second embedded end 402 formed at both ends of the inner layer are respectively embedded in the first connecting groove 102 and the second connecting groove 201, further enhancing the stability of the structure and the reliability of the connection. The fiber belt 404 is coated on the outer diameter of the molded inner layer 403, which not only enhances the impact resistance and wear resistance of the bottle cap, but also prevents the tear belt 40 from breaking during the tearing process. The secondary molding mechanism 8 performs mold injection molding through the secondary mold assembly 83 to form the outer layer of the bottle cap, ensuring the smoothness and aesthetics of the bottle cap surface. At the same time, the molding of the outer layer further consolidates the overall structure of the bottle cap, improves its deformation resistance and service life.

[0035] A plurality of positioning components 11 are arranged on the conveyor line 1, and the positioning components 11 are used to position the molding mold 2, so as to position the corresponding injection molding mechanism 4, the pre-embedded mechanism 3, the pre-demolding mechanism 5, the primary molding mechanism 6, the pre-demolding mechanism 5 and the secondary molding mechanism 8 during processing; in this embodiment, the positioning component 11 is specially designed for the precise positioning of the molding mold 2, ensuring the stability and accuracy of the mold during processing. When the mold is conveyed to the injection molding mechanism 4, the positioning component 11 can quickly and accurately position the mold at a predetermined position, providing a solid foundation for the injection molding operation. Subsequently, during the processing of the pre-embedded mechanism 3, the pre-demolding mechanism 5 and the primary molding mechanism 6, the positioning component 11 continues to play a role, ensuring the seamless connection and accurate conversion of the mold between various processes. It is particularly important that before entering the secondary molding mechanism 8, the mold is again precisely adjusted by the pre-demolding mechanism 5, and at this time, the accuracy and stability of the positioning component 11 are particularly important, which ensures that the mold will not be offset or deformed during the secondary molding process, thereby greatly improving the quality and consistency of the finished bottle cap. In addition, the design of these positioning components 11 also takes into account the automation and continuous production capacity of the equipment. They can efficiently cooperate with the operation of the conveyor line 1 to achieve rapid and accurate positioning of the mold, thereby significantly improving the production efficiency and capacity of the bottle cap secondary molding equipment.

[0036] The embedded mechanism 3 is manually embedded or automatically embedded. The embedded mechanism 3 includes a feed tray 31 and an automatic material picking manipulator 32. The feed tray 31 is used to feed the metal sheet 303, and the material picking manipulator is used to grab the metal sheet 303 from the feed tray 31 and then place it on the forming mold 2. In this embodiment, the feed tray 31 serves as a stable source of metal sheets 303, ensuring the continuity of the production process and avoiding production interruptions caused by material shortages. Its design is reasonable and can effectively manage the storage and transportation of the metal sheet 303, providing a solid foundation for subsequent forming processes. The application of the automatic material picking manipulator 32 is the technical highlight of the embedded mechanism 3. It uses advanced robotic arm technology and intelligent control system to accurately grab the metal sheet 303 on the feed tray 31 and place it accurately on the forming mold 2. This process not only achieves a high degree of automation, but also significantly improves the forming quality and consistency of the product.

[0037] The injection molding mechanism 4 includes an injection mold 41, an injection molding assembly 42 and an injection mold drive assembly 43, wherein the injection mold drive assembly 43 is used to drive the injection mold 41 to mold with the molding mold 2, and after the mold is molded, the injection molding assembly 42 is used to perform injection molding on the molding mold 2; in this embodiment, the injection molding mechanism 4, specifically including the injection mold 41, the injection molding assembly 42 and the injection mold drive assembly 43, is applied to the bottle cap secondary molding equipment, which can significantly improve the technical effect and efficiency of bottle cap production. The precise size and shape of the injection mold 41 ensure the high precision and consistency of the secondary molded bottle cap, which is crucial to ensure the sealing and durability of the product. The injection molding assembly 42 is responsible for injecting the molten plastic material into the mold cavity to ensure that the material can evenly and quickly fill the mold, thereby forming a bottle cap with a complete structure and a smooth appearance. The injection mold drive assembly 43 plays a key role in the bottle cap secondary molding process. It can provide a stable and powerful driving force to ensure that the injection mold 41 and the molding mold 2 are accurately molded, and avoid molding defects caused by mold misalignment or gaps. At the same time, the rapid response capability of the mold clamping drive assembly also shortens the mold opening and closing cycle and improves production efficiency.

[0038] The pre-demolding mechanism 5 includes a pre-demolding support 51, a pre-demolding driving component 52, a pre-demolding pressing component 53 and a pre-demolding material taking component 54, wherein the pre-demolding pressing component 53 and the pre-demolding material taking component 54 are both arranged on the pre-demolding driving component 52, and the pre-demolding driving component 52 is arranged on the pre-demolding support 51; the pre-demolding material taking component 54 is used for the fixing ring 20 to take the material and demold from the forming mold 2. In this embodiment, the pre-demolding support 51 serves as the supporting basis of the entire mechanism, ensuring the stable operation of each component. The pre-demolding driving component 52 serves as a power source, and drives the pre-demolding pressing component 53 and the pre-demolding material taking component 54 to complete their respective tasks through precise control. The pre-demolding pressing component 53 plays a key role in the molding process, which can ensure the stable molding of the bottle cap in the mold and prevent molding defects caused by mold gap or material flow. The pre-demolding material taking component 54 is specifically used for the fixing ring 20 to take the material and demold from the forming mold 2. The design of this component fully considers the structural characteristics of the bottle cap and the demoulding requirements. It can accurately and quickly complete the material removal action, effectively avoiding damage to the bottle cap during the demoulding process, thereby ensuring the integrity and aesthetics of the product.

[0039] The primary molding mechanism 6 includes a first molding drive module 61 and a first molding injection module 62, wherein the driving end of the first molding drive module 61 is connected to the primary mold clamping assembly 63, and the first molding injection module 62 is arranged on the primary mold clamping assembly 63; specifically, the fiber band wrapping mechanism 7 includes a wrapping fixed roller 71, a wrapping fixed frame 72, and a wrapping drive module 73, wherein the wrapping fixed roller 71 is arranged on the wrapping fixed frame 72, and the wrapping drive module 73 is used to drive the wrapping fixed frame 72 to move toward the molding mold 2, and the wrapping fixed frame 72 is used to fix the fiber band 404; the secondary molding mechanism 8 includes a second molding drive module 81 and a second molding injection module 82, wherein the driving end of the second molding drive module 81 is connected to the secondary mold clamping assembly 83, and the second molding injection module 82 is arranged on the secondary mold clamping assembly 83. In this embodiment, the primary molding mechanism 6 ensures the stability and accuracy of the mold during the injection molding process through the precise connection between the first molding drive module 61 and the primary mold clamping assembly 63. The first molding injection module 62 is arranged on the primary clamping assembly 63, which can efficiently inject molten plastic to form the basic shape of the bottle cap. This design not only improves the uniformity and consistency of injection molding, but also effectively reduces molding defects such as bubbles and shrinkage marks caused by mold instability. Secondly, the introduction of the fiber belt coating mechanism 7 provides an additional reinforcement layer for the bottle cap. The combination of the coating fixed roller 71 and the coating fixed frame 72 can firmly fix the fiber belt 404 to ensure its stability and continuity during the coating process. The coating drive module 73 drives the coating fixed frame 72 to move toward the molding mold 2, thereby realizing the precise coating of the fiber belt 404. This step not only enhances the strength and wear resistance of the bottle cap, but also gives the bottle cap a richer appearance and texture, meeting the market's demand for diversified bottle caps. Finally, the secondary molding mechanism 8 further finely molds the bottle cap through the close cooperation of the second molding drive module 81 and the secondary clamping assembly 83. The second molding injection mold assembly 82 is arranged on the secondary mold assembly 83, so that the molten plastic can be injected into the bottle cap again to perform secondary shaping and reinforcement on the bottle cap. This step not only improves the dimensional accuracy and structural stability of the bottle cap, but also effectively eliminates the internal stress that may be generated by the primary molding, thereby improving the durability and service life of the bottle cap.

[0040] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A secondary molding structure for a plastic bottle cap, characterized in that: The invention comprises a bottle cap body, a fixing ring, a connecting piece and a tear tape, wherein a sealing connecting part is arranged on the inner diameter of the bottle cap body, and the sealing connecting part is used to connect the bottle mouth of a plastic bottle, the connecting piece is arranged on one side of the bottle cap body and is used to connect the bottle cap body with the fixing ring, a first connecting groove is arranged on a side of the bottle cap body opposite to the fixing ring, a second connecting groove is arranged on a side of the fixing ring opposite to the first connecting groove, the tear tape connects the bottle cap body with the fixing ring through secondary molding, a first embedded end and a second embedded end are respectively arranged at two ends of the tear tape, the first embedded end is embedded in the first connecting groove, and the second embedded end is embedded in the second connecting groove, so that the tear tape connects the bottle cap body with the fixing ring; the tear tape comprises a molded inner layer, a fiber tape and a molded outer layer, and the molded outer layer and the molded inner side are molded by secondary injection to cover the fiber tape.

2. The secondary molding structure of the bottle cap of the plastic bottle according to claim 1, characterized in that: The bottle cap body is integrally injection-molded with the fixing ring through a connecting piece, and a first flat portion and a second flat portion are respectively provided at both ends of the connecting piece, wherein the first flat portion is used for connecting the bottle cap body, and the second flat portion is used for connecting the fixing ring.

3. The secondary molding structure of the bottle cap of the plastic bottle according to claim 1, characterized in that: It also includes a bottle mouth, which includes a bottle cap connecting part and a fixed connecting part, the bottle cap connecting part is used to install the bottle cap body, the fixed connecting part is used to install the fixing ring, the bottle cap connecting part is provided with a sealing matching part, and the sealing matching part is used to match the sealing connecting part to seal the bottle mouth.

4. The secondary molding structure of the bottle cap of the plastic bottle according to claim 3, characterized in that: The sealing connection part is a sealing connection buckle, and the sealing matching part is a sealing connection slot; the sealing connection buckle includes an introduction section, a clamping section and a sealing connection section, the introduction section is used to guide the sealing matching part toward the clamping section, the clamping section is used to be clamped on the sealing connection slot, and the sealing connection section is used to abut one side of the sealing slot.

5. The secondary molding structure of the bottle cap of the plastic bottle according to claim 2, characterized in that: A metal sheet is embedded in the connecting sheet, and the connecting sheet is covered with the metal sheet by injection molding, and one end of the metal sheet extends to the first flat portion, and the other end extends to the second flat portion; The metal sheet is a memory metal sheet, which is in a U shape at room temperature and in a straight shape at high temperature.

6. The secondary molding structure of the bottle cap of the plastic bottle according to claim 1, characterized in that: The tear tape is provided with a placement groove, and the fiber tape is arranged in the placement groove; a tearing handle is provided at one end of the tear tape, one end of the placement groove is connected to the tearing handle, and one end of the fiber tape extends to the tearing handle.

7. The secondary molding structure of the bottle cap of the plastic bottle according to claim 6, characterized in that: The fiber belt is provided with a plurality of through holes, and the molded inner layer and the molded outer layer are connected through the through holes.

8. A bottle cap secondary molding method, characterized in that: A secondary molding structure of a bottle cap of a plastic bottle comprising any one of claims 1 to 7; The bottle cap secondary molding method is implemented by a secondary molding device, which includes a conveyor line, a molding mold, a pre-embedded mechanism, an injection molding mechanism, a pre-demolding mechanism, a primary molding mechanism, a fiber belt coating mechanism and a secondary molding mechanism; the molding mold is arranged on the conveyor line, and the conveyor line is used to drive the molding mold to pass through the pre-embedded mechanism, the injection molding mechanism, the pre-demolding mechanism, the primary molding mechanism, the fiber belt coating mechanism and the secondary molding mechanism in sequence; the molding mold is provided with a bottle cap molding groove and a fixing groove, and an injection molding connecting groove is provided between the fixing groove and the bottle cap molding groove; The bottle cap secondary molding method comprises the following steps: Step S1, pre-embedding of metal parts: the forming mold is transported on the conveyor line, and when entering the pre-embedding mechanism, it is positioned on the conveyor line, and then the pre-embedding mechanism is used to pre-embed the metal sheet on the injection molding connection groove, and the injection molding connection groove has a positioning step for positioning the metal sheet; Step S2, injection molding: after the metal sheet is pre-embedded, the forming mold is then transported to the injection molding mechanism through the conveyor line, the injection molding mechanism closes the forming mold, and after closing the mold, the forming mold is injection molded to form the bottle cap body, the fixing ring and the connecting piece on the forming mold, and the connecting piece covers the metal sheet. During the injection molding, the forming mold is preheated so that the metal sheet is straight after being exposed to high temperature, and the metal sheet is covered by the connecting piece after injection molding; Step S3, demolding the fixing ring: after the injection molding is completed, the conveyor line conveys the molding mold to the pre-demolding mechanism, which is used to demold the fixing ring. At this time, the metal sheet cools during the conveying process and returns to the U shape after cooling, so that the fixing ring is opposite to the bottle cap and the bottle body; Step S4, one-step molding: after the fixed ring is demolded, the molding mold is transported to the one-step molding mechanism through the conveyor line. The one-step molding mechanism is provided with a one-step clamping assembly. The molding mold is clamped by the one-step clamping assembly, and then injection molding is performed to injection-mold the inner layer between the bottle cap body and the fixed ring. The two ends of the molded inner layer form a first embedded end and a second embedded end. The first embedded end is embedded in the first connecting groove, and the second embedded end is embedded in the second connecting groove. Step S5, fiber tape coating: after the injection molding of the molding inner layer by the primary molding mechanism is completed, the molding mold is transported toward the fiber tape coating mechanism through the conveyor line, and the fiber tape coating mechanism coats the fiber tape on the outer diameter of the molding inner layer; Step S6, secondary molding: The secondary molding mechanism is provided with a secondary mold assembly. After the fiber tape is coated, the secondary mold assembly is molded by the secondary molding mechanism, and then injection molding is performed to mold the outer layer. After molding, the bottle cap is prepared by waiting for cooling and setting.

9. The bottle cap secondary molding method according to claim 8, characterized in that: The conveyor line is provided with a plurality of positioning components, and the positioning components are used for positioning the molding mold so as to position the corresponding injection molding mechanism, the pre-embedded mechanism, the pre-mold release mechanism, the primary molding mechanism, the pre-mold release mechanism and the secondary molding mechanism during processing; The pre-embedding mechanism is manually pre-embedded or automatically pre-embedded, and the pre-embedding mechanism includes a feed tray and an automatic material taking manipulator, the feed tray is used for feeding metal sheets, and the material taking manipulator is used for grabbing the metal sheets from the feed tray and then placing them on the forming mold; The injection molding mechanism includes an injection mold, an injection molding assembly and an injection mold clamping drive assembly, wherein the injection mold clamping drive assembly is used to drive the injection mold to clamp the molding mold, and after the clamping, the injection molding assembly is used to perform injection molding on the molding mold; The pre-demolding mechanism includes a pre-demolding bracket, a pre-demolding drive component, a pre-demolding clamping component and a pre-demolding material taking component. The pre-demolding clamping component and the pre-demolding material taking component are both arranged on the pre-demolding drive component, and the pre-demolding drive component is arranged on the pre-demolding bracket; the pre-demolding material taking component is used for fixing the ring to take the material and demold from the molding mold.

10. The bottle cap secondary molding method according to claim 9, characterized in that: The primary molding mechanism comprises a first molding drive module and a first molding injection module, the driving end of the first molding drive module is connected to the primary mold clamping assembly, and the first molding injection module is arranged on the primary mold clamping assembly; The fiber band wrapping mechanism comprises a wrapping fixed roller, a wrapping fixed frame and a wrapping driving module, wherein the wrapping fixed roller is arranged on the wrapping fixed frame, the wrapping driving module is used to drive the wrapping fixed frame to move toward the forming mold, and the wrapping fixed frame is used to fix the fiber band; The secondary molding mechanism includes a second molding drive module and a second molding injection module. The driving end of the second molding drive module is connected to the secondary mold clamping assembly, and the second molding injection module is arranged on the secondary mold clamping assembly.

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