A watchband forming mold and a forming method

Abstract

The application discloses a watchband forming die and a forming method, and relates to the field of watch processing.The forming die comprises an upper die assembly and a lower die assembly.The upper die assembly comprises an upper die core, and the lower die assembly comprises a lower die core.The upper die core and the lower die core form a main cavity for forming a watchband after being closed.The first insert block is embedded and installed at one end of the main cavity of the lower die core.The top block is elastically installed on the first insert block.The first insert block and the top block can form a clamping cavity for fixing a metal fastener.A second insert block is arranged on the lower die core.When the upper die core and the lower die core are closed, the second insert block abuts against the top block, and the top block and the first insert block form the clamping cavity.The forming method of the watchband is based on the forming die.The application realizes one-time injection molding of three components and integral connection, effectively reduces the risk of breakage and looseness caused by interface separation, degumming or stress concentration, improves the reliability of the watchband under the conditions of repeated bending and long-term wearing, and significantly improves the overall production efficiency.

Description

Technical Field

[0001] This invention relates to the field of watch manufacturing technology, and in particular to a watch strap forming mold and forming method. Background Technology

[0002] With the widespread use of smartwatches, sports watches, and other wearable devices, watch straps, as a crucial component connecting the wearer and the watch head, have gradually evolved from single flexible materials to multi-material composite structures. Currently, common watch strap structures typically include a flexible strap body, a metal buckle, and a plastic connector between the two. The plastic connector serves as a structural transition, stress buffer, and connection fixation between the flexible strap and the metal buckle. In actual production, the plastic connector is usually pre-assembled with the metal buckle to form an assembly, which is then connected to the flexible strap.

[0003] To address the issues of watch strap molding and connection, several mold structure solutions have been proposed in the existing technology. Chinese utility model patent CN201921529950.8 discloses a watch strap structure mold, which mainly achieves injection molding and ejection of the watch strap through the cooperation of an upper mold, lower mold, mold rod, and ejection mechanism, thereby improving the demolding efficiency of the watch strap. This technical solution focuses on the ejection structure of the mold and the ease of part removal, and is suitable for molding and processing a single watch strap body.

[0004] However, the watch strap structure mold disclosed in the aforementioned comparative documents still has certain limitations. First, the mold is mainly designed for molding a single watch strap material. Its cavity structure and injection molding process do not address the pre-installation and positioning of the metal fastener and plastic connector, nor does it consider forming a reliable integral connection between the flexible watch strap, plastic connector, and metal fastener through a single injection molding process.

[0005] Therefore, while existing technologies can achieve basic forming or demolding of the watch strap body, there is still a lack of effective solutions for watch strap molds and their forming methods that can reliably connect pre-assembled plastic connectors and metal fasteners to the flexible watch strap through a single injection molding process, and effectively control the forming process of multiple components and materials. Therefore, this invention discloses a watch strap forming mold and forming method to solve the above problems. Summary of the Invention

[0006] Based on this, it is necessary to provide a watch strap molding mold and molding method to address the aforementioned technical problems. By pre-installing and positioning the plastic parts and metal buckles in the mold, and directly encapsulating the flexible watch strap material during the injection molding process, the flexible watch strap, plastic connectors, and metal buckles are integrally connected in a single injection molding process. This achieves a one-time injection molding integral connection of the three components, avoiding structural instability issues caused by multiple molding processes or subsequent assembly. It effectively reduces the risk of breakage and loosening caused by interface separation, delamination, or stress concentration, improves the reliability of the watch strap under repeated bending and long-term wear conditions, facilitates automated production, and significantly improves overall production efficiency.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A watch strap forming mold includes an upper mold assembly and a lower mold assembly. The upper mold assembly includes an upper mold core, and the lower mold assembly includes a lower mold core. After the upper mold core and the lower mold core are closed, a main cavity for forming a watch strap is formed. A first insert is embedded at one end of the lower mold core in the main cavity. A top block is elastically mounted on the first insert. The first insert and the top block can form a clamping cavity for fixing a metal fastener. A second insert is provided on the lower mold core. When the upper mold core and the lower mold core are closed, the second insert abuts against the top block, and the top block and the first insert form a clamping cavity.

[0009] In a preferred embodiment of the watch strap forming mold provided by the present invention, the first insert block is provided with a sliding groove, one end of the sliding groove is provided with a limiting structure, the top block is slidably connected to the sliding groove, and a stop block is fixedly connected to the first insert block, and a spring is provided between the top block and the stop block.

[0010] In a preferred embodiment of the watch strap forming mold provided by the present invention, the first insert has a mating surface that matches a surface of the metal fastener, the mating surface being the inner wall of the clamping cavity.

[0011] In a preferred embodiment of the watch strap forming mold provided by the present invention, the top block is provided with a top head, which matches the buckle groove of the metal fastener.

[0012] In a preferred embodiment of the watch strap forming mold provided by the present invention, the top block is provided with an insertion groove, the insertion groove is provided with a first inclined surface, the second insertion block is provided with a second inclined surface, the second insertion block enters into the insertion groove, the second inclined surface fits with the first inclined surface, after the second insertion block is fully inserted into the insertion groove, the top block fits with the limiting structure and forms a clamping cavity.

[0013] In a preferred embodiment of the watch strap forming mold provided by the present invention, the main cavity is provided with four cavities arranged at equal intervals, and the lower mold core is provided with a plurality of protrusions in the main cavity, the protrusions being arranged at equal intervals along the length direction of the main cavity.

[0014] In a preferred embodiment of the watch strap molding mold provided by the present invention, the center line of the main cavity along the length direction and the center line of the sliding direction of the top block are on the same vertical plane, and an injection molded part is connected to the metal fastener, the injection molded part extending into the main cavity.

[0015] As a preferred embodiment of the watch strap forming mold provided by the present invention, the lower mold assembly is provided with through-beam photoelectric sensors on both sides, one end is a receiving end and the other end is a transmitting end. The first insert block is provided with a small hole, which is used to allow the light beam emitted by the transmitting end of the through-beam photoelectric sensor to pass through. After the top block slides into place, the light beam passes through the small hole and is received by the receiving end.

[0016] In a preferred embodiment of the watch strap molding mold provided by the present invention, the upper mold assembly is provided with a mold opening, the lower end of the mold opening is connected to a horizontal runner, and the horizontal runner is connected to a vertical runner that communicates with the main cavity.

[0017] A method for forming a watch strap, which is based on the aforementioned watch strap forming mold, includes the following steps:

[0018] S1. Design the specifications of metal buckles, injection molded parts and main cavity according to the watch strap specifications, and pre-inject the metal buckles and injection molded parts together to form an assembly;

[0019] S2. Place the metal fastener end of the assembly onto the first insert block and place the injection molded part into the main cavity;

[0020] S3. Close the upper mold assembly and the lower mold assembly together. The second insert on the upper mold core fits and abuts against the top block. The top block and the first insert clamp and fix the metal fastener.

[0021] S4. After receiving the light signal passing through the small hole, the through-beam photoelectric sensor fixes the upper mold assembly and the lower mold assembly together.

[0022] S5. Inject the molten plastic into the main cavity through the gating channel or pressing channel;

[0023] S6. After the watch strap has cooled and solidified, the assembly is fixed together with the watch strap. Remove the upper mold assembly, reset the top block, and take out the watch strap from one end of the assembly.

[0024] S7. Trim and finish the watch strap to complete the strap shaping.

[0025] Compared with the prior art, the present invention has the following beneficial effects: The watch strap molding mold provided by the present invention pre-positions the plastic parts and metal buckles in the mold, and directly encapsulates the flexible watch strap material during the injection molding process, so that the flexible watch strap, plastic connectors and metal buckles are integrally connected in one injection molding process, realizing the integral connection of the three components in one injection molding, avoiding the structural instability problems caused by multiple molding or later assembly. Since the plastic parts and metal buckles are simultaneously encapsulated and fixed during the injection molding process, the connection interface between the flexible watch strap and the metal buckle is continuous and the stress is uniform, effectively reducing the risk of breakage and loosening caused by interface separation, delamination or stress concentration, improving the reliability of the watch strap under repeated bending and long-term wear conditions, reducing tooling switching and clamping steps, which is conducive to realizing automated production and significantly improving overall production efficiency. Attached Figure Description

[0026] To more clearly illustrate the solutions in this invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of the watch strap to be prepared;

[0028] Figure 2 This is a schematic diagram of the cross-sectional structure of the watch strap to be prepared;

[0029] Figure 3 This is a three-dimensional schematic diagram of the overall structure of the watch strap molding mold provided by the present invention;

[0030] Figure 4 This is a top view of the overall structure of the watch strap molding die provided by the present invention;

[0031] Figure 5 for Figure 4 Schematic diagram of the AA section;

[0032] Figure 6 for Figure 4 Schematic diagram of the BB cross section;

[0033] Figure 7 This is a schematic diagram of the lower mold assembly in the watch strap molding die provided by the present invention;

[0034] Figure 8 This is a schematic cross-sectional view of the upper mold core and lower mold core after they are closed in the watch strap forming mold provided by the present invention.

[0035] Figure 9 A schematic diagram showing the connection of the top block, the first insert block, and the second insert block in the watch strap forming mold provided by the present invention;

[0036] Figure 10 for Figure 9 Top view;

[0037] Figure 11 for Figure 10 Schematic diagram of the CC section;

[0038] Figure 12 This is a schematic diagram showing the connection between the top block and the second insert block in the watch strap forming mold provided by the present invention;

[0039] Figure 13 A schematic diagram of the first insert block structure in the watch strap forming mold provided by the present invention.

[0040] The markings in the diagram are explained as follows:

[0041] 100. Watch strap; 200. Metal fastener; 300. Injection molded part; 1. Upper mold assembly; 2. Lower mold assembly; 3. Upper mold core; 4. Lower mold core; 5. Upper module; 6. Lower module; 7. Main cavity; 8. Protrusion; 9. First insert block; 10. Ejector block; 11. Clamping cavity; 12. Second insert block; 13. Sliding groove; 14. Limiting structure; 15. Stop block; 16. Spring; 17. Ejector head; 18. Insertion groove; 19. First inclined surface; 20. Second inclined surface; 21. Through-beam photoelectric sensor; 22. Small hole; 23. Mold opening; 24. Horizontal runner; 25. Vertical runner; 26. Cooling pipe. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0044] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other.

[0045] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0046] Example 1

[0047] like Figure 1 and Figure 2 As shown, this is an existing watch strap structure, which includes a watch strap 100, an injection molded part 300, and a metal buckle 200. The injection molded part 300 can improve the connection strength between the watch strap 100 and the metal buckle 200 during injection molding. The watch strap 100 has several buckle holes along its length, and the metal buckle 200 has a buckle groove for fastening with the watch body. During injection molding, the watch strap 100, the injection molded part 300, and the metal buckle 200 need to be injection molded together.

[0048] Please refer to Figures 1-13 A watch strap molding die is provided, comprising an upper mold assembly 1 and a lower mold assembly 2. The upper mold assembly 1 includes an upper mold core 3, and the lower mold assembly 2 includes a lower mold core 4. The upper mold assembly 1 and lower mold assembly 2 also include other components, such as an upper module 5, a lower module 6, a top plate, a bottom plate, and an ejection structure. This part is a conventional structure and will not be described in detail here; those skilled in the art can easily fabricate it. The upper mold core 3 is embedded in the upper module 5, and the lower mold core 4 is embedded in the lower module 6. When the upper mold assembly 1 and the lower mold assembly 2 are closed, the upper module 5 and... The lower module 6 can be positioned and inserted to ensure the accuracy of mold closing. After the upper mold core 3 and the lower mold core 4 are closed, they form the main cavity 7 for molding the watch strap 100. In this embodiment, there are four main cavities 7, which are evenly spaced and distributed to allow simultaneous injection molding of four watch straps 100. The lower mold core 4 is provided with several protrusions 8 in the main cavity 7. The protrusions 8 are evenly spaced along the length of the main cavity 7 and correspond to the holes on the watch strap 100. A first insert 9 is embedded and installed at one end of the lower mold core 4 in each main cavity 7. A top block is elastically installed on the first insert 9. 10. The first insert block 9 and the top block 10 can form a clamping cavity 11 for fixing the metal fastener 200. One end of the metal fastener 200 is pre-injected with an injection molded part 300, which can improve the connection strength between the watch strap 100 and the metal fastener 200. The lower mold core 4 is provided with a second insert block 12. When the upper mold core 3 and the lower mold core 4 are closed, the second insert block 12 abuts against the top block 10. The top block 10 and the first insert block 9 form a clamping cavity 11, which is connected to the main cavity 7. The injection molded part 300 is connected to the metal fastener 200. After fixing, the end of the metal fastener 200 with the injection molded part 300 extends into the main cavity 7, and the injection molded part 300 connected to the end of the metal fastener 200 is in a suspended state. In this way, when the watch strap 100 is injection molded, the end of the watch strap 100 can wrap the injection molded part 300 and the metal fastener 200. The center line of the main cavity 7 along the length direction is on the same vertical plane as the center line of the sliding direction of the top block 10. After the metal fastener 200 is fixed, the center line of the metal fastener 200 and the injection molded part 300 is on the same vertical plane as the center line of the main cavity 7.

[0049] like Figures 8-13As shown, further, the first insert 9 is provided with a sliding groove 13, and the top block 10 is provided with limiting parts at both ends. The limiting parts are slidably connected with the limiting grooves on the inner walls of the sliding groove 13 at both ends, so as to ensure that the top block 10 slides along the sliding groove 13. The first insert 9 is provided with a limiting structure 14 at the end of the sliding groove 13 near the main cavity 7, and a stop block 15 is fixed at the end of the first insert 9 at the end of the sliding groove 13 away from the main cavity 7. A spring 16 is provided between the top block 10 and the stop block 15. In the initial state, the spring 16... 6. Pull the top block 10 away from the limiting structure 14. After the second insert block 12 pushes the top block 10, the top block 10 approaches the limiting structure 14, so that a clamping cavity 11 is formed between the top block 10 and the limiting structure 14, thereby clamping and fixing the metal fastener 200. After the top block 10 and the limiting structure 14 are in contact, the connection is in a sealed state. After the upper mold core 3 and the lower mold core 4 are closed, the upper mold core 3 is in contact with the upper surface of the top block 10, thereby forming a seal and preventing the injection material from entering the sliding groove 13 when the watch strap 100 is injection molded.

[0050] On the other hand, in its initial state, the spring 16 drives the top block 10 to approach the limiting structure 14. In this way, after the metal fastener 200 is placed into the clamping cavity 11, the top block 10 can directly fix the metal fastener 200 under the action of the spring 16, and ensure the stability of the top block 10 under the abutment of the second insert block 12, so as to avoid the top block 10 from shaking during injection molding and affecting the injection molding quality. After demolding, the top block 10 is manually slidable to unlock the metal fastener 200 and take out the watch strap 100. The initial states of the spring 16 and the top block 10 can be selected from the above two schemes, as long as the unlocking can be achieved.

[0051] like Figure 11 As shown, the first insert 9 further has a mating surface that matches a surface of the metal fastener 200. The mating surface is the inner wall of the clamping cavity 11. After the metal fastener 200 is placed on the first insert 9, the first insert 9 can fit with the mating surface. Moreover, the clamping cavity 11 of the first insert 9 can limit the first insert 9 to prevent the metal fastener 200 from shifting. The top block 10 is provided with a top head 17, and the metal fastener 200 is provided with a buckle groove. After the top block 10 fits with the limiting structure 14, the top head 17 is inserted into the buckle groove, thereby clamping and fixing the metal fastener 200.

[0052] like Figure 12 As shown, the top block 10 is further provided with an insertion groove 18, the insertion groove 18 is provided with a first inclined surface 19, and the second insertion block 12 is provided with a second inclined surface 20. After the second insertion block 12 is inserted into the insertion groove 18, the second inclined surface 20 fits against the first inclined surface 19. As the second insertion block 12 moves down, the second inclined surface 20 will abut against the first inclined surface 19. After the second insertion block 12 is fully inserted into the insertion groove 18, the top block 10 fits against the limiting structure 14 and forms a clamping cavity 11, thereby fixing the metal fastener 200.

[0053] like Figure 7 As shown, further, through-beam photoelectric sensors 21 are symmetrically arranged on both sides of the lower mold assembly 2. The through-beam photoelectric sensors 21 are fixed on the lower module 6 by a bracket. One end is the receiving end and the other end is the transmitting end. The first insert block 9 is provided with a small hole 22. The small hole 22 is used to pass through the beam emitted by the transmitting end of the through-beam photoelectric sensor 21. After the top block 10 slides into place, the beam passes through the small hole 22 and is received by the receiving end, which can ensure that the top block 10 is pushed into place and ensure the fixing stability of the metal fastener 200.

[0054] like Figure 1 , Figure 7 As shown, the upper mold assembly 1 is further provided with a mold opening 23, and the lower end of the mold opening 23 is connected to a horizontal runner 24. The horizontal runner 24 is connected to a vertical runner 25 that communicates with the main cavity 7. Molten plastic enters from the mold opening 23, passes through the horizontal runner 24 and the vertical runner 25 and enters the main cavity 7. After cooling, it forms the strap 100 structure.

[0055] Of course, cooling pipes 26 are arranged in both the upper mold assembly 1 and the lower mold assembly 2. One end of the cooling pipe 26 is a cooling water inlet and the other end is a cooling water outlet. After the watch strap 100 is injection molded, cooling liquid is introduced into the cooling pipe 26 to cool the watch strap 100 in the mold.

[0056] Example 2

[0057] This embodiment provides a method for forming a watch strap, which is based on the watch strap 100 forming mold in embodiment one. The forming method includes the following steps:

[0058] S1. Design the specifications of metal buckle 200, injection molded part 300 and main cavity 7 according to the specifications of watch strap 100, and pre-inject the metal buckle 200 and injection molded part 300 together to form an assembly;

[0059] S2. Place the metal fastener 200 end of the assembly onto the first insert block 9 and suspend the injection molded part 300 in the main cavity 7.

[0060] S3. Close the upper mold assembly 1 and the lower mold assembly 2. The second insert 12 on the upper mold core 3 fits and abuts against the top block 10. The top block 10 and the first insert 9 clamp and fix the metal fastener 200.

[0061] S4. After receiving the light signal passing through the small hole 22, the through-beam photoelectric sensor 21 fixes the upper mold assembly 1 and the lower mold assembly 2 together.

[0062] S5. Inject the molten plastic into the main cavity 7 through the pouring channel or pressing channel;

[0063] S6. After the watch strap 100 is cooled and cured, the assembly is fixed together with the watch strap 100. Remove the upper mold assembly 1, reset the top block 10, and take out the watch strap 100 from one end of the assembly.

[0064] S7. Trim and finish the edges of the watch strap 100 to complete the forming of the watch strap 100.

[0065] The working principle of the watch strap 100 molding die provided by this invention is as follows: By pre-positioning the plastic part and the metal buckle 200 in the mold, and directly covering and molding the flexible watch strap 100 material during the injection molding process, the flexible watch strap 100, the plastic connector and the metal buckle 200 are integrated in one injection molding process, realizing the one-time injection molding of the three components and avoiding the structural instability problems caused by multiple molding or later assembly. Since the plastic part and the metal buckle 200 are simultaneously covered and fixed during the injection molding process, the connection interface between the flexible watch strap 100 and the metal buckle 200 is continuous and the stress is uniform, which effectively reduces the risk of breakage and loosening caused by interface separation, delamination or stress concentration, improves the reliability of the watch strap 100 under repeated bending and long-term wear conditions, reduces tooling switching and clamping steps, facilitates automated production, and significantly improves overall production efficiency.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A watch strap forming mold, comprising an upper mold assembly and a lower mold assembly, the upper mold assembly comprising an upper mold core, the lower mold assembly comprising a lower mold core, wherein the upper mold core and the lower mold core, after being closed, form a main cavity for forming a watch strap, characterized in that: The lower mold core is located at one end of the main cavity and a first insert is embedded and installed. A top block is elastically installed on the first insert. The first insert and the top block can form a clamping cavity for fixing the metal fastener. The lower mold core is provided with a second insert. When the upper mold core and the lower mold core are closed, the second insert abuts against the top block, and the top block and the first insert form a clamping cavity. The first insert block is provided with a sliding groove, one end of the sliding groove is provided with a limiting structure, the top block is slidably connected to the sliding groove, and a stop block is fixedly connected to the first insert block, and a spring is provided between the top block and the stop block; The first insert has a mating surface that matches a surface of the metal fastener, the mating surface being the inner wall of the clamping cavity; The top block is provided with a top head, which matches the fastening groove of the metal fastener; The top block is provided with an insertion groove, the insertion groove is provided with a first inclined surface, the second insertion block is provided with a second inclined surface, the second insertion block enters into the insertion groove, the second inclined surface fits with the first inclined surface, after the second insertion block is fully inserted into the insertion groove, the top block fits with the limiting structure and forms a clamping cavity; The centerline of the main cavity along its length is on the same vertical plane as the centerline of the sliding direction of the top block. An injection molded part is connected to the metal fastener, and the injection molded part extends into the main cavity.

2. The watchband forming mold according to claim 1, wherein The main cavity is provided with four cavities arranged at equal intervals. The lower mold core is located inside the main cavity and has several protrusions, which are arranged at equal intervals along the length of the main cavity.

3. The watchband forming mold according to claim 1, wherein The lower mold assembly is symmetrically equipped with through-beam photoelectric sensors on both sides, with one end being the receiving end and the other end being the transmitting end. The first insert block is provided with a small hole, which is used to allow the light beam emitted by the transmitting end of the through-beam photoelectric sensor to pass through. After the top block slides into place, the light beam passes through the small hole and is received by the receiving end.

4. The watchband forming mold according to claim 1, wherein The upper mold assembly is provided with a mold opening, the lower end of which is connected to a horizontal sprue, and the horizontal sprue is connected to a vertical sprue that communicates with the main cavity.

5. A method of forming a watchband, characterized by, The watch strap is formed using the mold described in claim 3, and the forming method includes the following steps: S1. Design the specifications of metal buckles, injection molded parts and main cavity according to the watch strap specifications, and pre-inject the metal buckles and injection molded parts together to form an assembly; S2. Place the metal fastener end of the assembly onto the first insert block and place the injection molded part into the main cavity; S3. Close the upper mold assembly and the lower mold assembly together. The second insert on the upper mold core fits and abuts against the top block. The top block and the first insert clamp and fix the metal fastener. S4. After receiving the light signal passing through the small hole, the through-beam photoelectric sensor fixes the upper mold assembly and the lower mold assembly together. S5. Inject the molten plastic into the main cavity through the gating channel or pressing channel; S6. After the watch strap has cooled and solidified, the assembly is fixed together with the watch strap. Remove the upper mold assembly, reset the top block, and take out the watch strap from one end of the assembly. S7. Trim and finish the watch strap to complete the strap shaping.

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