Injection mold

Abstract

The utility model belongs to the technical field of plastic forming connection, and provides an injection mold which comprises a first half mold body and a second half mold body. The first half mold body and the second half mold body comprise mold cavity parts which correspond to each other; a cavity is defined by the first half mold body and the second half mold body; the cavity is provided with a pouring gate, and the pouring gate is communicated with the external space of the injection mold; the cavity is further provided with a discharging opening, and the discharging opening communicates with the external space of the injection mold. And the cross sectional area of the sprue is larger than that of the discharge port. Due to the fact that the cross sectional area of the sprue is larger than the cross sectional area of the discharge port, when glue injection is carried out, more glue is injected into the sprue, less glue overflows out of the discharge port, the glue in the cavity can be filled and compacted through the pressure difference generated in the cavity, and meanwhile bubbles in the cavity are extruded to be discharged out of the cavity from the discharge port along with the overflowing glue.

Description

Technical Field

[0001] This application belongs to the field of plastic molding connection technology, and particularly relates to an injection mold. Background Technology

[0002] A cord pull tab, also known as a cord pull head or cord pull loop, is typically used in conjunction with a zipper and is widely used in accessories for clothing, bags, outdoor products, and other industries.

[0003] A rope pull tail consists of two parts: the rope itself and the pull tail. The rope is usually woven from fiber materials and comes in round or flat varieties. The pull tail is attached to the end of the rope and is typically made of polymer or metal materials.

[0004] High-temperature injection molding is a process in which heated and molten polymer material is injected into an injection mold using an injection molding machine, and the ends of the cord are wrapped around it to form a cord tail. High-temperature injection molding is currently the mainstream manufacturing process. High pressure is used to compact the rubber material and expel air from the cavity.

[0005] To simplify the process and reduce production equipment costs, a liquid adhesive with a viscosity range of 5000–15000 cPs that cures at room temperature (25±5℃) is used, and a viscosity of 0.1–1 kg / cm³ is employed. 2 When the injection pressure is extremely low, an injection mold that can work with it to compact the colloid and expel air bubbles is needed. Summary of the Invention

[0006] This application provides a rope injection mold, aiming to solve the problem of providing a liquid adhesive that can cure at room temperature (25±5℃) using a viscosity range of 5000 to 15000 cPs, and using 0.1 to 1 kg / cm³. 2 An injection mold that compacts the colloid and removes air bubbles under extremely low injection pressure.

[0007] This application provides an injection mold, the injection mold including a first half mold body and a second half mold body; the first half mold body and the second half mold body include corresponding cavity portions; the first half mold body and the second half mold body together form a cavity.

[0008] The cavity is provided with a gate, which communicates with the external space of the injection mold; the cavity is also provided with a discharge port, which communicates with the external space of the injection mold.

[0009] The cross-sectional area of ​​the gate is larger than the cross-sectional area of ​​the discharge port.

[0010] Optionally, the injection mold is further provided with a material replenishment cavity, and the gate communicates with the external space of the injection mold through the material replenishment cavity.

[0011] Optionally, the first half-mold and the second half-mold include corresponding feeding cavities, and the first half-mold and the second half-mold together form the feeding cavities.

[0012] Optionally, the injection mold is further provided with a discharge cavity, and the discharge port is connected to the external space of the injection mold through the discharge cavity.

[0013] Optionally, the first half-mold and the second half-mold include corresponding discharge cavities, which are formed by the first half-mold and the second half-mold together.

[0014] Optionally, the injection mold is further provided with a fixing groove for fixing the rope, one end of the fixing groove is connected to the cavity, and the other end is connected to the outside of the injection mold.

[0015] Optionally, the first half-mold and the second half-mold include corresponding fixing grooves, and the first half-mold and the second half-mold together form the fixing grooves.

[0016] Optionally, the ratio of the cross-sectional area of ​​the gate to the cross-sectional area of ​​the discharge port is between 1.4 and 2.6.

[0017] Optionally, the ratio of the cross-sectional area of ​​the gate to the cross-sectional area of ​​the discharge port is 1.8.

[0018] Optionally, the guiding system of the injection mold consists of guide pillars disposed on one of the first half-mold body and the second half-mold body, and guide sleeves disposed on the other half-mold body.

[0019] It is understandable that liquid adhesives with a viscosity range of 5000–15000 cPs that cure at room temperature (25±5℃) are used, and the viscosity is 0.1–1 kg / cm³. 2 Under ultra-low injection pressure, since the cross-sectional area of ​​the gate is larger than that of the discharge port, more material is injected into the gate and less material overflows from the discharge port during the injection of the material. The pressure difference generated in the cavity can fill and compact the material in the cavity, while squeezing out air bubbles in the cavity and expelling them from the discharge port along with the overflowing material. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the two halves of the injection mold provided in the embodiments of this application;

[0021] Figure 2 This is a three-dimensional schematic diagram of the injection mold half-mold assembly provided in the embodiments of this application;

[0022] Figure 3 This is a process flow diagram of a rope pull-tail injection molding method provided in one embodiment of this application;

[0023] Figure 4 This is a process flow diagram of a rope-pulling injection molding method according to another embodiment of this application;

[0024] Figure 5a This is a heat map of exposed defect rate of rope and strap provided in Table 1 of this application, fitted with the embodiments and comparative examples;

[0025] Figure 5b These are heat maps of glue deficiency rates fitted to the embodiments and comparative examples provided in Table 1 of this application;

[0026] Figure 5c This is a heat map of burr defect rate fitted to the embodiments and comparative examples provided in Table 1 of this application;

[0027] Figure 6a The viscosity-defect rate curves fitted to the embodiments and comparative examples provided in Table 1 of this application are shown.

[0028] Figure 6b The pressure-defect rate curves of the embodiments and comparative proportions provided in Table 1 of this application are shown.

[0029] Figure label:

[0030] 100. Injection molds;

[0031] 110. First half-mold; 120. Second half-mold;

[0032] 111. Cavity (first half of the mold); 121. Cavity (second half of the mold);

[0033] 112. Material filling cavity (first half of the mold body); 122. Material filling cavity (second half of the mold body);

[0034] 113. Discharge cavity (first half of the mold body); 123. Discharge cavity (second half of the mold body);

[0035] 114. Fixed groove (first half of the mold body); 124. Fixed groove (second half of the mold body);

[0036] 101. Cavity; 102. Material feeding cavity; 103. Material discharge cavity; 104. Fixing groove;

[0037] 105. Gate; 106. Discharge port. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] The following describes specific embodiments of this application through several specific implementation methods. It should be noted that, due to the disclosure of this application, some specific implementation methods of some embodiments and some alternative improvements become obvious. Those skilled in the art can, based on the disclosure of this application, reasonably adjust the order of the various implementation methods of the various embodiments in this application according to actual needs, and combine, add, or remove the various implementation methods. It should be understood that these improved solutions also fall within the protection scope of this application.

[0040] For easier understanding of the rope pull-tail injection molding method provided in this application, please refer to the appendix. Figure 1 and attached Figure 2 First, we will introduce an injection mold 100 provided in one embodiment of this application. (See attached image.) Figure 1 This is a schematic diagram of the two halves of the mold in the open state. Figure 2 This is a schematic diagram of the two halves of the model combined.

[0041] The injection mold 100 includes a first mold half 110 and a second mold half 120. The first mold half 110 and the second mold half 120 include corresponding cavity portions (111, 121), material filling cavity portions (112, 122), material discharge cavity portions (113, 123), and fixing groove portions (114, 124). The first mold half 110 and the second mold half 120 together form a cavity 101, a material filling cavity 102, a material discharge cavity 103, and a fixing groove 104.

[0042] In some embodiments, the cavities (111, 121), feeding cavities (112, 122), discharge cavities (113, 123), and fixing grooves (114, 124) of the first half-mold 110 and the second half-mold 120 can be symmetrical mirror structures or asymmetrical structures. For example, the cavity 111 of the first half-mold 110 can be provided with commercial logos or pattern molding structures, and the cavity 121 of the second half-mold 120 has a smooth curved surface structure.

[0043] The cavity 101 is provided with a gate 105. The gate 105 communicates with the external space of the injection mold 100 through the filling cavity 102. The cavity 101 is also provided with a discharge port 106. The discharge port 106 communicates with the external space of the injection mold 100 through the discharge cavity 103. The cross-sectional area of ​​the gate 105 is larger than the cross-sectional area of ​​the discharge port 106. One end of the fixing groove 104 communicates with the cavity 101, and the other end of the fixing groove 104 communicates with the outside of the injection mold 100.

[0044] Cavity 101 is used to shape the outer surface of the pull tail, to contain the rubber material and the built-in rope, and its shape is designed and manufactured according to the pull tail's shape.

[0045] In some embodiments, the size of the mold cavity 101 is 5% to 15% larger than the outer dimensions of the pull tail. The specific ratio is determined according to the material shrinkage rate. The size here can be the cross-sectional area of ​​the rope and the cavity 101.

[0046] In some embodiments, the ratio of the cross-sectional area of ​​the gate 105 to the cross-sectional area of ​​the discharge port 106 is between 1.4 and 2.6, for example, 1.4, 1.5, 1.6...2.6. In some specific examples, the ratio is preferably 1.8, that is, the ratio of the cross-sectional area of ​​the gate 105 to the cross-sectional area of ​​the discharge port 106 is 1.8.

[0047] In some implementations, the mold is provided with multiple cavities. The number of cavities is determined according to the production batch. The more cavities the mold has, the higher the output within the cycle. Thanks to the cavity shaping, standardization and richness of product shapes, the defects of the single and irregular tail shape of the dip-resin process can be made up for.

[0048] The gate 105 is a channel for injecting colloid into the cavity 101. One end is connected to the cavity 101 and the other end is connected to the feeding cavity 102.

[0049] In some implementations, the diameter of the gate 105 is selected as Φ0.5~1.0mm. In some specific examples, the shape of the gate 105 is selected as a dot gate. The dot gate can easily detach from the pull tail after drying and demolding, leaving no obvious marks and requiring no post-processing. The dot gate is beneficial to improving the appearance quality of the product and production efficiency.

[0050] The discharge port 106 is a channel for the overflow of the adhesive material in the cavity 101 and an outlet for the air in the cavity 101. One end is connected to the cavity 101 and the other end is connected to the discharge cavity 103.

[0051] In some embodiments, the diameter of the discharge port 106 can be selected as Φ0.3~0.7mm. In the embodiments provided in this application, the size of the discharge port 106 must be smaller than the size of the gate 105.

[0052] In some embodiments, the discharge port 106 is selected as a dot-shaped discharge port. A dot-shaped discharge port allows for easy separation from the pull tail after drying and demolding, leaving no obvious marks and requiring no post-processing. Using a dot-shaped discharge port can improve the appearance quality of the product and production efficiency.

[0053] The fixing groove 104 is used to place and hold the rope and is connected to the cavity 101. The fixing groove 104 holds the rope and keeps it from loosening, so that the rope and keeps it naturally straight in the cavity 101 and is located at the center line of the pull tail glue position after molding.

[0054] In some embodiments, the size of the fixing groove 104 is 0.1 to 0.3 mm smaller than the overall size of the rope. The length of the fixing groove 104 is controlled between 5 and 20 mm, so that the rope can be clamped after the mold is closed.

[0055] The replenishment cavity 102 accommodates any additional material added after injection molding. It is used to replenish the material shortage caused by the drying and shrinkage of the material within the mold cavity 101, preventing voids and missing material in the molded product. One end of the replenishment cavity 102 is connected to the gate 105, and the other end connects to the external space of the injection mold 100, making it an open cavity. The replenishment cavity 102 provides space to compensate for material shrinkage shortages, enhancing the replenishment function after injection molding and compensating for process defects.

[0056] In some embodiments, the volume of the feeding chamber 102 is 5% to 20% of the volume of the mold cavity 101.

[0057] The discharge cavity 103 accommodates the overflow of plastic material discharged from the cavity 101 during injection molding. One end of the discharge cavity 103 is connected to the discharge port 106, and the other end connects to the external space of the injection mold 100, making it an open cavity. During injection molding, the plastic material flows and fills within the cavity 101. Inevitably, the plastic material will compress and entrain air within the cavity 101, forming air bubbles. The discharge cavity 103 provides space for the plastic material containing air bubbles to escape, preventing air bubbles from appearing after the product is molded. The discharge cavity 103 provides space to accommodate overflowing plastic material, increasing the venting function during mold injection and removing trapped air from the process.

[0058] In some embodiments, the volume of the discharge cavity 103 is 5% to 30% of the volume of the mold cavity 101.

[0059] The guiding system is designed to ensure that the two half-molds are accurately aligned when the mold is closed.

[0060] In some embodiments, the guiding system of the injection mold consists of guide posts (not shown in the figures) disposed in one of the first half-mold body 110 and the second half-mold body 120, and guide sleeves (not shown in the figures) disposed in the other half-mold body. For example, guide posts are provided in the first half-mold body 110, and guide sleeves are provided in the second half-mold body 120.

[0061] Because this application employs an ultra-low pressure injection molding process at room temperature, the mold does not need to withstand high injection pressure impacts or external large clamping forces during injection molding. This simplifies the design of the locking structure of the injection mold 100 itself.

[0062] In some embodiments, there is no need for side locks, stops, side positioning blocks, or other positioning and guiding designs for high-pressure injection molding. The positioning and guiding of the mold can be accomplished simply by using a guide post set in one of the first half mold body 110 and the second half mold body 120, and a guide sleeve set in the other. This forms a guiding mechanism that requires less mold opening and closing force and is convenient for mold opening and closing operations.

[0063] It is understood that, based on the inventive concept of this application, the following optional implementation methods can be implemented individually or in combination.

[0064] One embodiment may include an injection mold comprising a first mold half and a second mold half; the first and second mold halves include corresponding cavities; the first and second mold halves together form a cavity; the cavity is provided with a gate, which communicates with the external space of the injection mold; the cavity is also provided with a discharge port, which communicates with the external space of the injection mold; the cross-sectional area of ​​the gate is larger than the cross-sectional area of ​​the discharge port.

[0065] Optionally, the injection mold 100 is also provided with a feeding cavity 102, and the gate 105 is connected to the external space of the injection mold 100 through the feeding cavity 102.

[0066] Optionally, the first half-mold 110 and the second half-mold 120 include corresponding feeding cavities (112, 122), and the first half-mold 110 and the second half-mold 120 together form the feeding cavity 102.

[0067] Optionally, the injection mold 100 is also provided with a discharge cavity 103, and the discharge port 106 is connected to the external space of the injection mold 100 through the discharge cavity 103.

[0068] Optionally, the first half-mold body 110 and the second half-mold body 120 include corresponding discharge cavities (113, 123), and the first half-mold body 110 and the second half-mold body 120 together form the discharge cavity 103.

[0069] Optionally, the injection mold 100 is also provided with a fixing groove for fixing the rope, one end of which is connected to the cavity 101 and the other end is connected to the outside of the injection mold 100.

[0070] Optionally, the first half-mold 110 and the second half-mold 120 include corresponding fixing grooves (114, 124), and the first half-mold 110 and the second half-mold 120 together form the fixing grooves.

[0071] Optionally, the ratio of the cross-sectional area of ​​the gate 105 to the cross-sectional area of ​​the discharge port 106 is between 1.4 and 2.6.

[0072] Optionally, the cross-sectional area of ​​the gate 105 is greater than that of the discharge port 106 by a ratio of 1.8.

[0073] Optionally, the guiding system of the injection mold consists of guide pillars disposed in one of the first half mold body 110 and the second half mold body 120, and guide sleeves disposed in the other half mold body.

[0074] It is understandable that liquid adhesives with a viscosity range of 5000–15000 cPs that cure at room temperature (25±5℃) are used, and the viscosity is 0.1–1 kg / cm³. 2 Under ultra-low injection pressure, since the cross-sectional area of ​​the gate 105 is larger than that of the discharge port 106, more material is injected into the gate 105 and less material overflows from the discharge port 106 during the injection of the material. The pressure difference generated in the cavity can fill and compact the material in the cavity, while squeezing out air bubbles in the cavity and expelling them from the discharge port 106 along with the overflowing material.

[0075] The following is a reference appendix. Figure 3 This application introduces an embodiment of a rope-pulling injection molding method using an injection mold 100. This injection molding method, in conjunction with the injection mold 100 provided in this embodiment, completes the injection molding process.

[0076] An embodiment of this application provides a rope and tape pull-tail injection molding method, which includes the following steps:

[0077] Step 1 (S100): Place the rope.

[0078] The rope is placed in the fixing groove 114 of the first half mold body 110, with one end of the rope exposed outside the first half mold body 110 and the other end built into the cavity 111 of the first half mold body 110.

[0079] In some embodiments, one end of the rope is exposed outside the half-mold body, and the other end is embedded inside the cavity 111 of the half-mold body. The length of the rope embedded inside the cavity 111 is slightly less than the length of the cavity 101, with a length difference of 1 to 3 mm.

[0080] In some embodiments, the rope is provided with an anchoring gel structure, and the rope with the anchoring gel structure is placed in a fixed groove of a half-mold.

[0081] Step 2 (S200): Lock the injection mold 100.

[0082] The first half-mold 110 and the second half-mold 120, on which the rope is placed, are closed, and pressure is applied to the two half-molds to lock the injection mold 100.

[0083] In some embodiments, the locking injection mold 100 is as follows Figure 4 As shown, this can be accomplished in two sub-steps: initial mold closing (S210) and mold locking mechanism locking the mold (S220).

[0084] The mold is initially closed (S210). Through the cooperation of the guide pillar and the guide sleeve, the first half mold body 110 and the second half mold body 120, on which the rope is placed, are initially closed, and the rope is initially clamped and fixed to the center line of the mold cavity 101.

[0085] The mold-locking mechanism (S220) locks the mold, inserting the initially closed injection mold 100 between the front and rear templates of the mold-locking mechanism and applying pressure to lock the mold. The rope is further clamped by the mold to prevent it from loosening, while preventing liquid glue from overflowing and seeping out at the mold parting surface.

[0086] Step 3 (S300): Add the adhesive.

[0087] Take a room temperature curing liquid adhesive with a viscosity range of 5000 to 15000 cPs (centipoises per second) and put it into the material cylinder of the injection molding machine; wherein the room temperature is 25±5℃.

[0088] In some embodiments, the room temperature curing liquid adhesive with a viscosity of 5000 cPs can have a viscosity of one of 5000 cPs, 6000 cPs, 7000 cPs...15000 cPs; it can also be any one between 5000 and 15000 cPs; or the viscosity variation range can be between 5000 and 15000 cPs.

[0089] In some implementations, the room temperature range can be one of 20°C, 21°C, 22°C...30°C; it can also be any one of 25±5°C; or the temperature variation range can be between 25±5°C.

[0090] In some embodiments, the room temperature curing liquid adhesive can be selected from liquid colloids such as room temperature vulcanizing silicone, acrylic resin, polyurethane resin, unsaturated polyester resin, or epoxy resin.

[0091] For example, room temperature curing silicone is preferred, and two-component addition room temperature curing silicone is even more preferred. Addition room temperature curing silicone can be cured at room temperature without releasing byproducts during curing. The surface and inner layers are cured simultaneously, and the curing speed and pot life of the silicone can be adjusted through formulation design.

[0092] For example, 1 cPs is equivalent to water, 1000 cPs is equivalent to glycerin, and 10000 cPs is equivalent to honey. The higher the proportion of thinner in the adhesive, the lower the viscosity of the liquid silicone composition. When the viscosity exceeds 15000 cPs, the liquid silicone composition has poor flow properties, making it difficult to fully fill and flow within the cavity 101 under ultra-low pressure, easily resulting in insufficient adhesive in the product. At the same time, the impact force of the liquid silicone composition on the built-in cord increases during ultra-low pressure injection, easily causing the cord to deviate from the center line of the cavity 101, resulting in cord exposure. When the viscosity is below 5000 cPs, the liquid silicone composition has good flow properties, but under ultra-low pressure, it easily seeps out from the mold parting surface, resulting in burrs on the parting line of the product after drying.

[0093] Step 4 (S400): First injection.

[0094] The first injection of the rubber compound is performed, including injection molding at a rate of 0.1–1 kg / cm². 2 The pressure between the two forces the liquid adhesive to be injected from the gate 105 into the cavity 101. The pressure difference between the gate 105 and the discharge port 106 is used to compact the liquid adhesive and squeeze the air bubbles in the cavity 101 towards the discharge port 106, so that the air bubbles and part of the liquid adhesive are discharged from the cavity 101 through the discharge port 106. The injection stops when the discharge cavity 103 is detected to be overflowed and filled to the first preset position.

[0095] In some implementations, the injection pressure can be 0.1 kg / cm². 2 0.2kg / cm 2 0.3kg / cm 2 ...1kg / cm 2 One of them; it can also be 0.1~1kg / cm 2 Any one of these; it can also be a pressure variation range of 0.1–1 kg / cm². 2 between.

[0096] In some embodiments, the first preset position is between the discharge port 106 and the discharge chamber 103 when it is filled to 2 / 3 capacity. Stopping injection when the discharge chamber 103 is detected to be overflowing and filled to the first preset position can be achieved by stopping pressure when the volume of the discharge chamber 103 is detected to be approximately 2 / 3 overflowing and filled. It is understood that this preset position can be adjusted according to actual production needs.

[0097] In some embodiments, the injection molding mechanism's power control system applies ultra-low pressure, causing the plunger to push the liquid colloid in the cylinder, injecting a metered amount of ultra-low pressure from the gate 105 into the mold cavity 101. The metering is based on the liquid colloid filling the cavity 101 and overflowing from the discharge port 106. The liquid colloid gradually overflows from the discharge port 106, and the pressure difference between the gate 105 and the discharge port 106 compacts the liquid colloid within the cavity 101, while simultaneously expelling air from the cavity 101 with the overflow.

[0098] In some embodiments, the specific implementation of detecting that the discharge chamber 103 has overflowed and filled to a first preset position becomes apparent from the disclosure of this application. A sensor can be used to detect the liquid level in the discharge chamber 103; alternatively, the stroke of the plunger when the discharge chamber 103 reaches the first preset position can be pre-recorded, and the overflow filling of the discharge chamber 103 to the first preset position can be determined subsequently based on this stroke.

[0099] Step 5 (S500): Second injection.

[0100] The second injection of the adhesive material includes retracting the injection mechanism until the nozzle reaches the second preset position in the filling chamber 102, injecting the liquid adhesive material into the filling chamber 102, and stopping the injection when the liquid adhesive material fills the third preset position of the volume of the filling chamber 102.

[0101] In some embodiments, the injection mechanism may retract to the second preset position within the material replenishment chamber 102 when the nozzle reaches the injection nozzle. This can be achieved by the injection mechanism rising away from the gate 105 and retracting 5-10 mm within the material replenishment chamber 102. The specific retraction distance can be set according to actual production needs.

[0102] In some embodiments, when the liquid material fills to the third preset position of the filling cavity 102, the injection is stopped. Alternatively, the liquid material can be injected into the mold filling cavity 102 from the injection nozzle. When the liquid material fills to 2 / 3 of the filling cavity 102, the injection is stopped and the injection mechanism retracts and resets.

[0103] Step 6 (S600): Apply vibration to the injection mold 100.

[0104] Vibration is applied to the injection mold 100 in a preset vibration mode. The vibration promotes the transfer of some liquid material in the filling cavity 102 into the cavity 101 under the pressure difference between the gate 105 and the discharge port 106.

[0105] In some implementations, the preset vibration mode includes applying vibration once every 10 to 20 minutes, with each vibration lasting 15 to 60 seconds, and stopping the vibration after applying vibration 2 to 5 times.

[0106] In some implementations, the vibration direction can be any direction in space, or it can be vibration in multiple directions. The vibration amplitude can be adjusted in actual production.

[0107] Step 7 (S700): Pre-ventilation treatment and mold opening and part removal.

[0108] After applying vibration to the injection mold 100, the injection mold 100 is left to stand for a preset semi-drying time. After ventilating the cavity 101 and leaving it to stand for a preset full drying time, the two half mold bodies are fully opened, and the cured molding rope is taken out and pulled off.

[0109] In some embodiments, the preset semi-drying time is 30 to 60 minutes, and the cavity 101 is ventilated and left to stand. The preset full drying time includes: opening a gap of 0.3 to 1 mm between the two half molds, and then leaving it to stand for 1 to 2 hours.

[0110] In some embodiments, see Figure 4 Before the pre-ventilation treatment and mold opening and part removal in step 7 (S700), the process also includes a mold removal and transfer step (S650). After vibration is completed, the front and rear templates of the mold clamping mechanism open, and the mold is removed from the mold clamping mechanism.

[0111] After the mold is removed, the operation path switches to two paths:

[0112] The first operation involves transferring the mold to a transfer platform and waiting for the liquid colloid inside the mold to dry before proceeding with subsequent operations.

[0113] Another operational path involves deploying another set of replica molds to begin the next cycle, which begins the placement of the rope and tape, repeating this process continuously. This cyclical process requires a significant number of replica molds, the specific number depending on the production scale. Through unique process control, the room temperature ultra-low pressure injection molding of the rope and tape tail is ensured to operate cyclically and effectively, achieving large-scale production.

[0114] By coordinating the two operation paths, multiple sets of replica molds can work alternately in a cycle, which solves the problem of long curing time of the rubber material, improves production efficiency, and makes the ultra-low pressure injection molding process more suitable for large-scale production.

[0115] In some implementations, the mold is left to stand on the transfer platform for 30-60 minutes. Then, a 0.3-1mm gap is opened between the two mold halves, and the mold is left to dry for another 1-2 hours. Afterward, the two mold halves are fully opened, and the drying and shaping rope tail is removed; at this point, the rope tail is a semi-finished product. During the drying process, the 0.3-1mm gap between the two mold halves creates air convection, promoting the evaporation of the diluent in the liquid colloid within the cavity 101, thus shortening the drying time and improving cycle efficiency. Experimental tests show that if the two mold halves remain closed during the drying process, without opening the gap, the drying time will be extended by 1-2 hours.

[0116] To verify the compatibility of room temperature curing adhesives under ultra-low pressure injection, the following orthogonal experiments were conducted, as shown in Table 1.

[0117] Table 1

[0118]

[0119]

[0120] This application provides a method for injection molding of cord pull tails. This method utilizes a room-temperature curing adhesive with a specific viscosity range, working closely and organically with an ultra-low pressure injection molding process and ultra-low pressure injection molds to achieve room-temperature ultra-low pressure cord pull tail injection molding. This simplifies the design and manufacturing of injection molding equipment and molds, reduces equipment and mold costs, and shortens equipment and mold development cycles. It meets the market demands for highly customized cord pull tail products, diverse product shapes, frequent product updates, and high product quality requirements. Since heating and pressurization are not required, energy consumption during the cord pull tail production process is reduced, thus lowering production costs.

[0121] This application utilizes the close connection, interdependence, and synergistic effect between room temperature curing adhesives of specific viscosity, ultra-low pressure injection molding process, and injection mold to jointly solve the technical problem of "how to provide a rope and ribbon tail manufacturing method that is simple in process, low in production equipment cost, low in energy consumption, customizable in product shape, and high in product quality".

[0122] Firstly, the applicant of this application has discovered that when using the injection mold provided in this application for injection molding, the viscosity of the rubber compound and the injection pressure have different effects on the exposed cord defect rate, the insufficient adhesive defect rate, and the burr defect rate, and even their effects on these three defects can be contradictory. For example, excessive viscosity will reduce the burr defect rate, but at the same time increase the exposed cord defect rate and the insufficient adhesive defect rate. If only considering viscosity or injection pressure, it is difficult to determine how to obtain a product with the required defect rate at room temperature. This application utilizes a liquid rubber compound with a viscosity range of 5000 to 15000 cPs that cures at room temperature, and a viscosity of 0.1 to 1 kg / cm³. 2 The mixture is formulated with ultra-low injection pressures. This viscosity range allows the room-temperature curing liquid compound to flow freely within the mold cavity during ultra-low injection pressure, preventing insufficient material in the product. Simultaneously, the viscosity range is not too high, avoiding increased impact on the conduits within the mold, which could cause them to deviate from the cavity centerline and become exposed. Because ultra-low pressure injection is used, the clamping pressure can also be reduced, ensuring the viscosity range is not too low. This prevents the compound from easily seeping from the mold parting line, avoiding burrs on the parting line after drying, thus improving product quality. Figure 5a , Figure 5b and Figure 5c Table 1 shows the heatmaps of cubic spline interpolation fitting for the embodiments and comparative examples. Figure 6a and Figure 6bTable 1 shows the curves obtained by cubic spline interpolation fitting for the embodiments and comparative examples. It should be noted that... Figure 6a and Figure 6b The curves represent the combined effect of viscosity and pressure. To intuitively and conveniently illustrate the differences between the examples and comparative figures, the results are presented separately from the perspectives of viscosity and pressure. Figure 5a , Figure 5b and Figure 5c ,as well as Figure 6a and Figure 6b See, this application utilizes a liquid adhesive with a viscosity range of 5000–15000 cPs that cures at room temperature, and a viscosity of 0.1–1 kg / cm³. 2 By combining the ultra-low injection pressures between the components and using the injection mold provided in this application for injection molding, a good balance is achieved between several defect indicators that affect or even contradict each other, thereby improving the quality of the product.

[0123] Secondly, the injection mold provided in this application has a discharge port and a discharge cavity in the cavity. Since the cross-sectional area of ​​the gate is larger than that of the discharge port, during the first injection of the rubber compound, more rubber compound is injected into the gate and less overflows from the discharge port. The fluidity of the rubber compound fills the cavity, and the pressure difference generated within the cavity can compact the rubber compound, while simultaneously squeezing out air bubbles and discharging them into the discharge cavity along with the overflowing rubber compound. Unlike high-temperature injection molding, which requires heating and pressurization of the injection equipment and heat-resistant, heat-dissipating, and pressure-bearing designs for melting and compacting the rubber compound, this application achieves rubber compound filling, compaction, and air bubble discharge under ultra-low injection pressure. This reduces the design and manufacturing costs of the injection equipment and mold. Furthermore, it eliminates the need for pressurization and heating during production, reducing energy consumption and the production cost of the corded tail.

[0124] Thirdly, the adhesive material shrinks during curing, leading to insufficient adhesive in the process. The injection mold provided in this application features a replenishment cavity. The viscosity range of the adhesive material allows it to maintain a certain level of fluidity even as its viscosity increases during shrinkage. Simultaneously, a preset vibration mode enhances the fluidity of the adhesive. Utilizing the pressure generated into the cavity during adhesive shrinkage and the pressure difference created by the larger cross-sectional area of ​​the gate than the outlet, a portion of the liquid adhesive in the replenishment cavity is transferred into the cavity using the preset vibration mode to compensate for the insufficient adhesive caused by shrinkage.

[0125] Fourthly, the ultra-low pressure injection molding process of this application utilizes the setting of the discharge chamber. By detecting whether the discharged material in the discharge chamber reaches the first preset position, it is easy to determine whether the amount of material injected into the cavity meets the requirements. When the injection mold is a steel mold or a non-transparent plastic mold, this improves the automation level of the injection molding process and increases injection molding production efficiency. Compared with solutions that cannot detect overflow, such as vents or overflow channels, this quantifies the degree of overflow and reduces the product defect rate.

[0126] Simultaneously, the discharge chamber can collect a portion of the rubber material during the first injection of the ultra-low pressure injection molding process. During the second injection, gravity separates air bubbles and rubber material within the discharge chamber. During the curing and shrinkage of the colloid, the main replenishment material in the cavity comes from the replenishment chamber. However, some shrinkage is inevitable at the discharge port. The rubber material collected in the discharge chamber can compensate for this shrinkage, preventing short-fill defects at the discharge port, thereby improving product quality and yield.

[0127] Fifthly, this application uses a liquid adhesive with a viscosity range of 5000–15000 cPs that cures at room temperature. While the injection mold provided in this application enables ultra-low pressure injection molding, it also correspondingly extends the curing time of the adhesive. In the ultra-low pressure injection molding process provided in this application, after applying vibration to the injection mold, the mold is left to stand for a first preset time, i.e., until the adhesive in the cavity has initially cured. After ventilating the cavity, the two mold halves are fully opened. Pre-ventilation before the adhesive is completely dry utilizes air convection to promote the evaporation of the diluent in the liquid adhesive within the cavity, shortening the curing time and improving the efficiency of the entire ultra-low pressure injection molding process, making it more suitable for large-scale production.

[0128] Sixthly, the first and second half of the mold body together form the cavity, the filling cavity, the discharge cavity, and the fixing groove. In other words, the room temperature ultra-low pressure injection mold consists of two mating half-mold bodies with the parting line as the boundary. Because it uses room temperature ultra-low pressure injection molding, the entire process is completed at room temperature, eliminating the need for mold cooling or heating. Under ultra-low pressure conditions, the mold does not need to withstand high injection pressure impacts or external large clamping forces. This simplifies the design of the injection molding equipment's clamping mechanism and the mold itself. The injection mold does not require an ejection system or a support system, simplifying the gating and guiding systems. Furthermore, the requirements for mold material performance are not high; even plastic materials can be used to make the injection mold. This shortens the design cycle of injection molding equipment and molds, reducing the cost of designing and producing them.

[0129] In summary, it can be seen that achieving a new room-temperature ultra-low-pressure injection molding process requires addressing the following interrelated sub-topics: the impact of colloid flowability on the cord, how to compact the colloid, how to remove air bubbles, how to reduce burrs, how to reduce and compensate for insufficient colloid shrinkage, how to detect overflow, how to shorten the colloid drying time, how to reduce costs, and how to save energy.

[0130] To solve a single technical problem, the usual design approach is to add new functional components or processes, or to improve existing functional components or processes. However, the purpose of this application is to solve the above-mentioned problems while streamlining the process flow and simplifying the injection mold and injection equipment. Therefore, how to design the process flow and the synergistic relationship between the injection mold and injection equipment becomes the focus of this application.

[0131] The rope and ribbon injection molding method provided in this application solves the problem of how to provide a rope and ribbon manufacturing method that is simple in process, low in production equipment cost, low in energy consumption, customizable in product shape, and high in product quality through the close connection, interdependence, and synergistic effect between the viscosity of liquid rubber that cures at room temperature, the ultra-low injection pressure process, and the cleverly designed mold structure.

[0132] This application simplifies the design and manufacturing of injection molding equipment and molds, reduces equipment and mold costs, and shortens equipment and mold development cycles. It meets the market demands for highly customized rope tail products, diverse product shapes, frequent product updates, and high product quality requirements. Because it eliminates the need for heating and pressurization, it also reduces energy consumption and production costs during the production of rope tail products.

[0133] In some embodiments, the section of the rope placed in the cavity is an embedded section wrapped in colloid. Before placing the rope in step 1 (S100), the rope is cut according to the shape and size required by the design, and the embedded section is processed with an anchoring colloid structure.

[0134] In some real-time methods, the buried section is processed with an anchoring colloid structure, including:

[0135] The method includes at least one of the following: providing a structure protruding from the surface of the rope in the buried section, providing a structure recessed into the surface of the rope in the buried section, providing a structure penetrating the rope in the buried section, and bending and shaping the buried section.

[0136] In some specific examples, structures protruding from the surface of the rope include at least one of a raised ring, a raised texture, and a raised dot; structures recessed from the surface of the rope include at least one of a groove, a recessed dot, and a raised texture; structures penetrating the rope include at least one of a through hole and a through groove. The bending and shaping of the buried section includes at least one of a wave-shaped bend and a sawtooth bend.

[0137] For example, the rope is cut to the shape and size required by the design, and an anchoring adhesive structure is set in the buried section of the rope to enhance the bonding strength between the rope and the tail. The anchoring adhesive structure includes shapes such as rings, holes, grooves, dots, and patterns, with circular through holes being preferred. Circular through holes allow the adhesive material at the rope tail to pass through and cover the rope, forming a bolted anchoring adhesive structure.

[0138] For example, by hot-pressing the embedded section of the rope through thermoforming, a smooth transition waveform similar to a sine wave can be created, or a sawtooth-shaped bend with obvious turns can be created, similar to a triangular wave.

[0139] For example, the anchoring colloid structure can be combined by first creating a circular through hole in the rope-covered section, and then bending and shaping it.

[0140] Due to the elasticity of polymer materials, the buried section of the rope may detach from the pull tail adhesive when subjected to significant tensile force. The anchoring adhesive structure creates a mechanical interlocking force between the rope and the pull tail. The rope and pull tail are bonded together by both interfacial adhesion and mechanical interlocking force, resulting in higher strength and the ability to withstand greater external tensile forces. This reduces the risk of the rope detaching from the pull tail, and the anchoring adhesive structure enhances the product's tensile strength.

[0141] In some implementations, the processing of the anchoring colloid structure is accomplished by methods such as laser, ultrasonic, and thermoforming, which can prevent the fibers at the rope cut from springing back and loosening or scattering during the manufacturing process.

[0142] In some embodiments, before adding the adhesive in step 3 (S300), the method further includes preparing a room temperature curing liquid adhesive.

[0143] The room temperature curing liquid adhesive is a two-component addition room temperature curing silicone composition. The two-component addition room temperature curing silicone composition includes the following components by weight: 110 parts of two-component addition room temperature curing silicone, 70-150 parts of diluent, and 5-20 parts of color paste.

[0144] The diluent can effectively improve the flowability of two-component addition room temperature curing silicone and adjust and control the viscosity of the liquid silicone composition. Petroleum ether is preferred because it has good volatility and the product dries in a short time after room temperature low-pressure injection molding.

[0145] In some embodiments, the diluent is 70 to 150 parts, for example, one of 70, 80, 90...150 parts; or any one of 70 to 150 parts. This is used to adjust the viscosity of the two-component addition-cured room-temperature silicone to between 5000 and 15000 cPs in combination with other components.

[0146] Color paste, which facilitates pigment dispersion, is mainly composed of silicone oil and pigments. It can provide a variety of colors for room temperature low-pressure injection molding of liquid silicone and ensure uniform color distribution in the final product.

[0147] In some embodiments, the color paste is in the form of 5 to 20 parts, for example, one of 5, 6, 7... 20 parts; or any one of 5 to 20 parts.

[0148] In some specific embodiments, the two-component addition-type room temperature curing silicone includes two raw materials, component A and component B, which are mixed in a weight ratio of 10:1.

[0149] Component A contains the following components by weight:

[0150] 65-75 parts of the first base silicone, preferably vinyl silicone oil;

[0151] 25-35 parts of reinforcing agent, preferably fumed silica;

[0152] 1 to 3 parts of crosslinking agent, preferably methyl hydrogen silicone oil;

[0153] 0.01 to 0.1 parts of inhibitor, preferably ethynyl alcohol.

[0154] Component B comprises the following components by weight:

[0155] 90-95 parts of a second base silicone, preferably vinyl silicone oil;

[0156] 2 to 5 parts of catalyst, preferably chloroplatinic acid catalyst;

[0157] 1 to 5 parts of release agent, preferably methyl silicone oil.

[0158] In some embodiments, air bubbles are often introduced into the liquid silicone composition during the preparation process. After preparation, a vacuum is required to remove the air bubbles.

[0159] The base silicone provides fundamental physical and chemical properties, such as mechanical properties and temperature resistance. As the main resin, it is combined with other components such as crosslinking agents and catalysts to form silicone products with specific properties. The first and second base silicone provided in the embodiments of this application may be the same or different.

[0160] In some embodiments, the first base silicone is 65 to 75 parts, for example, one of 65, 66, 67...75 parts; or any one of 65 to 75 parts. The second base silicone is 90 to 95 parts, for example, one of 90, 91, 92...95 parts; or any one of 90 to 95 parts.

[0161] Reinforcing agents, such as silica or silica powder, can enhance the mechanical properties of silicone, improving its tensile strength, elongation at break, and tear strength.

[0162] In some embodiments, the color paste is in the form of 5 to 20 parts, for example, one of 5, 6, 7... 20 parts; or any one of 5 to 20 parts.

[0163] Crosslinking agents are polysiloxanes containing multiple Si-H bonds. They react with vinyl groups in the base polymer in addition-type silicone to form a three-dimensional network structure, thereby achieving the curing of the silicone.

[0164] In some embodiments, the crosslinking agent is 1 to 3 parts, for example, one of 1 part, 1.5 parts, 2 parts...3 parts; or any one of 1 to 3 parts.

[0165] Inhibitors function to control the rate of the curing reaction, preventing excessively rapid reactions that could lead to heat buildup and decreased material properties. They slow down the reaction rate by competitively binding to reactive sites on the catalyst.

[0166] In some embodiments, the inhibitor is 0.01 to 0.1 parts, for example, one of 0.01 parts, 0.02 parts, 0.03 parts...0.1 parts; or any one of 0.01 to 0.1 parts.

[0167] Catalysts are substances that promote the curing reaction of silicone rubber, typically platinum compounds or platinum complexes. In two-component addition room-temperature curing silicone rubber, the presence of a catalyst enables the reaction between the crosslinking agent and the base polymer, causing the silicone rubber to transform from a liquid to a solid state.

[0168] In some embodiments, the catalyst is 2 to 5, for example, one of 2 parts, 2.5 parts, 3 parts...5 parts; or any one of 2 to 5.

[0169] Release agents reduce the adhesion between silicone and the mold, making it easier to remove the cured silicone products from the mold, thus improving production efficiency and product appearance quality.

[0170] In some embodiments, the release agent is 1 to 5 parts, for example, one of 1 part, 1.5 parts, 2 parts...5 parts; or any one of 1 to 5 parts.

[0171] In summary, by optimizing the combination of materials, the applicability of materials can be effectively improved, and the operation and control of room temperature ultra-low pressure injection molding can be better matched, in order to achieve the best process effect.

[0172] In some embodiments, see Figure 4After the pre-ventilation treatment and mold opening and part removal in step 7 (S700), the process also includes step 8 (S800) of tailing surface treatment.

[0173] In some implementations, the cord pull is made of liquid colloidal raw materials such as acrylic resin, polyurethane resin, unsaturated polyester resin, and epoxy resin. After room temperature ultra-low pressure injection molding, the surface of the cord pull semi-finished product only needs to be decorated with graphics and colors such as pad printing, screen printing, spraying, and inkjet printing. No other special surface treatment is required.

[0174] In some implementations, after room temperature ultra-low pressure injection molding of silicone, the surface of the silicone cord pull tail semi-finished product has high adhesiveness and easily attracts dust, lint, and other dirt. Therefore, special surface treatment is required. These special surface treatments include photo-oxidation using 365nm ultraviolet light and impregnation with matte silicone. After surface treatment, the semi-finished product becomes the finished product, with a dust-free surface and a comfortable, soft feel.

[0175] One embodiment of this application also provides a room temperature ultra-low pressure injection molding device, which includes an injection mechanism, a clamping mechanism, and a vibration mechanism.

[0176] In some embodiments, the injection molding mechanism includes an injection nozzle, a material cylinder, a plunger, and a power control system, and is vertically positioned above the clamping mechanism. The injection molding mechanism functions to apply ultra-low pressure and quantitatively inject liquid colloid into the mold cavity for molding at room temperature.

[0177] In some embodiments, the clamping mechanism includes a front mold plate, a rear mold plate, and a power control system, all fixed to the vibration mechanism. The clamping mechanism functions to apply pressure to lock the two halves of the mold, further clamping the rope to prevent it from loosening, while preventing the liquid colloid in the mold cavity from overflowing and seeping out at the parting surface, and avoiding burrs at the tail-end mold line after drying. Therefore, the applied clamping pressure does not need to be very high.

[0178] In some embodiments, the vibration mechanism includes a vibration table and a vibration generating system. The vibration mechanism generates vibration, causing the clamping mechanism and the room temperature ultra-low pressure injection mold to vibrate together. Mold vibration ensures that the liquid colloid in the mold cavity and filling cavity can flow and fill in a high-viscosity state, promptly replenishing the shortage caused by the drying shrinkage of the colloid. Taking two-component addition room temperature curing silicone as an example: As the drying time of two-component addition room temperature curing silicone increases, the liquid silicone composition in the mold continues to undergo a hydrosilicon addition reaction, while the diluent continuously evaporates and decreases, gradually changing from a liquid to a solid state. The viscosity of the liquid silicone composition gradually increases, and its flowability deteriorates. The resistance to free flow by gravity in the mold cavity and filling cavity increases, thus failing to promptly replenish the shortage of colloid caused by the drying shrinkage of the liquid silicone composition in the cavity. This results in defects such as missing colloid and voids in the product after molding and drying. The vibration mechanism drives the mold to vibrate, and the vibration force promotes the high-viscosity flow of the colloid, compensating for material and process defects.

[0179] In summary, by utilizing the specific functions and roles of the machine, the reliability and stability of the room temperature ultra-low pressure injection molding process for cord pull tails are ensured, thereby achieving industrialization.

[0180] For a better understanding of this application, see [link to relevant documentation]. Figure 4 This application provides a specific embodiment to illustrate the rope and tape pull-tail injection molding method provided in this application. It should be noted that this specific embodiment does not constitute a limitation of this application.

[0181] Step 1 (S100): Place the rope.

[0182] The rope is placed in the fixed groove of the first half of the mold body, with one end of the rope protruding outside the first half of the mold body and the other end embedded in the cavity of the first half of the mold body. The length of the rope embedded in the cavity of the half of the mold body is slightly less than the length of the cavity, with a length difference of about 1.5 mm.

[0183] Step 2 (S200): Locking the injection mold. This includes two sub-steps: initial mold closing (S210) and mold locking mechanism locking the mold (S220).

[0184] The mold is initially closed (S210). Through the cooperation of the guide pillar and the guide sleeve, the first half of the mold body with the rope is initially closed with the second half of the mold body, and the rope is initially fixed to the center line of the mold cavity.

[0185] The mold-locking mechanism (S220) locks the mold, inserting the initially closed injection mold between the front and rear mold plates of the mold-locking mechanism and applying pressure to lock the mold. The rope is further clamped by the mold to prevent loosening, while preventing liquid glue from overflowing and seeping out at the mold parting surface.

[0186] Step 3 (S300): Add the adhesive.

[0187] Take a room temperature curing liquid adhesive with a viscosity range of 10000 cPs. This adhesive is a two-component addition-type room temperature curing silicone and add it into the material cylinder of the injection molding machine. The room temperature is 25°C.

[0188] Step 4 (S400): First injection.

[0189] The first injection of the rubber compound is performed, including the injection molding mechanism at 0.2 kg / cm². 2 The pressure between the gate and the outlet forces the liquid material into the cavity from the gate. The pressure difference between the gate and the outlet compacts the liquid material and squeezes the air bubbles in the cavity towards the outlet, causing the air bubbles and some liquid material to be discharged from the cavity. Injection stops when the outlet cavity is detected to be filled to about 2 / 3 of its volume by overflow.

[0190] Step 5 (S500): Second injection.

[0191] The second injection of the rubber compound includes retracting the injection mechanism until the nozzle reaches a position 6mm away from the gate in the filling chamber, injecting the liquid rubber compound into the filling chamber, stopping the injection when the liquid rubber compound fills 2 / 3 of the filling chamber volume, and retracting the injection mechanism to reset.

[0192] Step 6 (S600): Apply vibration to the injection mold.

[0193] Vibration is applied to the injection mold using a preset vibration mode. The vibration promotes the transfer of some liquid material in the filling cavity into the cavity under the pressure difference between the gate and the discharge port.

[0194] The default vibration mode is to apply vibration once every 15 minutes, with each vibration lasting 20 seconds, and to stop applying vibration after 3 vibrations.

[0195] The mold removal and transfer step (S650). After vibration is completed, the front and rear templates of the mold clamping mechanism open, and the mold is removed from the mold clamping mechanism.

[0196] After the mold is removed, the operation path switches to two paths:

[0197] The first operation involves transferring the mold to a transfer platform and waiting for the liquid colloid inside the mold to dry before proceeding with subsequent operations.

[0198] Another operational path involves investing in another set of replication molds and entering the next cycle, which is to start the rope placement step (S100). This process is repeated continuously. During the repeated cycle, a large number of replication molds need to be invested. The specific number of molds depends on the production scale.

[0199] Step 7 (S700): Pre-ventilation treatment and mold opening and part removal.

[0200] After applying vibration to the injection mold, let it stand for 40 minutes. After ventilating the cavity and letting it stand for 1.5 hours, fully open the two half molds and remove the cured molding rope tail.

[0201] After the pre-ventilation treatment and mold opening and part removal in step 7 (S700), the tail-pulling surface treatment is performed in step 8 (S800). The surface treatment includes photo-oxidation treatment using 365nm ultraviolet light and impregnation treatment using matte silicone. After surface treatment, the semi-finished product is transformed into a finished product. The finished product has a dust-free surface and a comfortable and soft feel.

[0202] It is understood that those skilled in the art can combine various implementation methods in the above embodiments under the guidance of the above examples to obtain technical solutions with multiple implementation methods.

[0203] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. Injection mold, characterized in that The injection mold comprises a first mold half and a second mold half; the first mold half and the second mold half comprise corresponding cavity parts; the first mold half and the second mold half jointly form a cavity; The cavity is provided with a gate, which is in communication with the outside space of the injection mold; the cavity is also provided with a discharge port, which is in communication with the outside space of the injection mold; The cross-sectional area of the gate is greater than that of the discharge port.

2. The injection mold of claim 1, wherein, The injection mold is also provided with a feeding cavity, and the gate is in communication with the outside space of the injection mold through the feeding cavity.

3. The injection mold of claim 2, wherein, The first mold half and the second mold half comprise corresponding feeding cavity parts, and the first mold half and the second mold half jointly form the feeding cavity.

4. Injection mold according to any one of claims 1 to 3, characterized in that The injection mold is also provided with a discharge cavity, and the discharge port is in communication with the outside space of the injection mold through the discharge cavity.

5. The injection mold of claim 4, wherein, The first mold half and the second mold half comprise corresponding discharge cavity parts, and the first mold half and the second mold half jointly form the discharge cavity.

6. The injection mold according to any one of claims 1 to 3, wherein The injection mold is also provided with a fixing groove for fixing a rope belt, one end of the fixing groove is in communication with the cavity, and the other end is in communication with the outside of the injection mold.

7. The injection mold of claim 6, wherein, The first mold half and the second mold half comprise corresponding fixing groove parts, and the first mold half and the second mold half jointly form the fixing groove.

8. The injection mold of claim 1, wherein, The cross-sectional area of the gate is greater than that of the discharge port, and the ratio is in the range of 1.4-2.

6.

9. The injection mold of claim 8, wherein, The cross-sectional area of the gate is greater than that of the discharge port, and the ratio is 1.

8.

10. The injection mold of claim 1, wherein, The guide system of the injection mold is composed of a guide pin arranged on one of the first mold half and the second mold half, and a guide sleeve arranged on the other.

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