Copper mold core for solving mold exhaust

Abstract

The utility model provides a copper mold core for solving mold exhaust, and aims to solve the problems of unsmooth mold exhaust, bubble accumulation, material adhesion, difficult demolding and the like. The copper mold core mainly comprises a mold core column body, a forming groove, an exhaust micropore, an exhaust groove, a fixing lug and a surface coating. The mold kernel column body is made of copper or copper alloy and has excellent thermal conductivity; the forming groove is formed in the top of the mold kernel column body, and the smoothness of the formed surface is ensured through high-precision machining and polishing; the exhaust micropores and the exhaust grooves are respectively formed in the interior of the forming groove and the edge of the mold kernel column body and are used for effectively exhausting gas in the forming process and avoiding bubble retention; and the fixing lugs are used for stably mounting the mold core on production equipment. Through the design, the exhaust effect of the mold is remarkably improved, the forming quality of contact lenses is improved, the demolding process is smooth, and the service life of the mold is prolonged. The method is suitable for the production field of contact lenses and other high-precision medical instruments, and has wide application prospects.

Description

Technical Field

[0001] This utility model relates to the field of contact lens manufacturing technology, specifically to a copper mold core for solving mold venting. Background Technology

[0002] As an important medical device, contact lenses require extremely high precision, quality, and surface finish during manufacturing. However, poor gas venting within the mold during contact lens molding often leads to a series of problems, such as bubble formation, incomplete material filling, surface defects, and decreased optical performance. These issues not only affect the yield and quality of contact lenses but also increase production costs and impact the user's wearing experience and eye health. Therefore, mold venting has become a pressing technical challenge in contact lens manufacturing.

[0003] Traditional contact lens manufacturing molds are typically made of steel or other metals, relying primarily on tiny venting grooves on the parting surface for air venting. However, this method has limitations in precision molding processes, especially in high-precision molding, where gas is difficult to completely escape, leading to air bubbles or dents on the contact lens surface, affecting optical performance and wearing comfort. Furthermore, over long-term use, material adhesion can cause demolding difficulties, further reducing production efficiency and mold lifespan. Copper mold cores, due to their excellent thermal conductivity and ease of processing, are increasingly being used in contact lens manufacturing molds. Copper can rapidly conduct and dissipate heat, effectively controlling the temperature of the molding material, shortening curing time, and improving production efficiency. However, despite these advantages, the venting problem of copper mold cores remains unresolved in practical applications, especially when molding complex contact lenses, where issues such as air bubble accumulation in the edge areas and demolding difficulties persist.

[0004] In view of this, we have studied and improved upon the existing problems, and provided a copper mold core to solve the problem of mold venting. The aim of this technology is to solve the problem and improve its practical value. Utility Model Content

[0005] The present invention aims to solve the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted by this utility model is: a copper mold core for solving mold venting, comprising the following structure:

[0007] Mold core column: Used to support the entire mold structure. The mold core is made of copper or copper alloy material with good thermal conductivity and machinability, which helps to dissipate heat quickly and shorten molding time.

[0008] Forming groove: Located at the top of the mold core column, it serves as the forming area for the contact lens. The surface of the forming groove undergoes high-precision machining and polishing to ensure that the optical surface of the contact lens is precise and flawless.

[0009] Venting micropores: Distributed in key locations within the molding groove, the diameter of the micropores ranges from 0.01 mm to 0.02 mm, ensuring that gas inside the mold can be smoothly discharged during the molding process and preventing air bubbles from remaining in the material.

[0010] Venting grooves: These are located on the side or edge of the mold core. The width of the venting grooves is 0.01 mm to 0.05 mm and the depth is 0.02 mm to 0.1 mm. They can effectively vent gas without causing material to overflow.

[0011] Surface Coating: The surface of the molding tank is coated with a fluoropolymer coating or a diamond-like carbon (DLC) coating. This coating reduces the affinity between the material and the mold surface, reduces material adhesion within the mold, and improves demolding efficiency. In addition, surface treatment combines nano-coating technology or microstructure surface treatment to make the mold surface superhydrophobic, further reducing bubble accumulation and accelerating uniform material distribution and venting.

[0012] Fixed ears: Located at the bottom of the mold core, they securely install the mold onto the production equipment through mounting holes, ensuring the stability and precise positioning of the mold during the molding process.

[0013] Through the above design, the copper mold core of this invention can effectively solve the problem of gas venting within the mold, prevent air bubble accumulation, ensure that the contact lens material can be evenly filled throughout the mold, and improve the demolding effect through a low-affinity coating design. Furthermore, the copper mold core has good thermal conductivity and durability, which can improve production efficiency and extend the mold's service life.

[0014] The beneficial effects achieved by this utility model are as follows:

[0015] 1. In this utility model, the precision molding groove design ensures the high precision of the optical surface of the contact lens, giving the finished product excellent optical performance, effectively correcting vision, and meeting the high standards required for contact lenses. The surface smoothness is achieved through high-precision CNC machining and polishing processes, ensuring that the lens surface is smooth and flawless, improving wearing comfort and safety.

[0016] 2. In this invention, the liquid affinity of the molding tank surface is significantly reduced by fluoropolymer coating or diamond-like carbon (DLC) coating, which reduces the adhesion of contact lens material in the molding tank, improves demolding efficiency and yield. Nano-coating technology or microstructure surface treatment makes the molding tank superhydrophobic, making it easier for the material to detach from the mold, avoiding material adhesion to the mold surface, and reducing residues in production.

[0017] 3. In this utility model, the design of the exhaust micropores and exhaust grooves ensures that the gas in the mold can be effectively discharged during the material molding process, avoiding gas retention in the contact lens material, preventing the formation of bubbles, and thus avoiding the impact on optical performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model.

[0019] Figure label:

[0020] 1. Mold core column; 2. Exhaust micropores; 3. Exhaust groove; 11. Molding groove; 12. Fixing ear. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0022] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0023] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a copper mold core for solving mold venting.

[0024] Example 1: Combination Figure 1 As shown, the present invention provides a copper mold core for solving mold venting, including a mold core column 1, a forming groove 11, venting micro-holes 2, venting grooves 3, and fixing ears 12.

[0025] The mold core column 1 is a cylindrical structure made of copper, which has excellent thermal conductivity and structural strength, effectively supporting and stabilizing the entire mold structure. At the bottom of the mold core column 1, there are two symmetrically distributed fixing ears 12, each with mounting holes for installing the mold core onto production equipment, ensuring the stability of the mold core.

[0026] A molding groove 11 is located at the top of the mold core column 1 and is used to mold the optical surface of the contact lens. The inner surface of the molding groove 11 is treated with high-precision CNC machining and polishing processes to ensure extremely high smoothness, thereby enabling precise molding of the optical surface of the contact lens. To improve the demolding effect, the surface of the molding groove 11 is coated with a fluoropolymer coating or a diamond-like carbon (DLC) coating. The thickness of this coating is controlled between 1 micrometer and 5 micrometers, which effectively reduces the affinity of liquids to the surface of the molding groove without affecting the optical accuracy of the molding. In addition, the surface of the molding groove 11 is also treated with microstructure, using microtexturing or nanocoating technology to form a superhydrophobic surface, which helps to promote venting in the edge areas during the molding process and prevents the accumulation of air bubbles in the non-venting micropores 2.

[0027] The venting micro-holes 2 are located on the inner side of the inner wall of the molding groove 11. The diameter of the venting micro-holes ranges from 0.01 mm to 0.02 mm. They are used to accurately discharge the gas generated in the mold during the molding process, while preventing the molding material from entering the venting micro-holes 2, thereby ensuring molding accuracy.

[0028] The venting groove 3 is located on the side of the mold core column 1 and is connected to the venting micro-hole 2 through the flow channel inside the mold core column. The width of the venting groove 3 ranges from 0.01 mm to 0.05 mm and the depth ranges from 0.02 mm to 0.1 mm. It is used to discharge gas from the mold during the molding process, prevent gas retention, and avoid the overflow of molding material.

[0029] During the use of this invention, when the molding material is injected into the molding groove 11 of the mold, the gas inside the mold is discharged through the venting micro-holes 2 and then exits the mold via the venting groove 3. The surface coating and microstructure treatment of the molding groove 11 can effectively reduce gas retention in the mold, improve the venting effect, and reduce the generation of bubbles during the molding process. By using high-precision CNC machining technology, the smooth surface and molding accuracy of the molding groove 11 are ensured, thereby guaranteeing the optical quality of the contact lenses.

[0030] Example 2: Improved integration of coating and structure

[0031] In practical applications, the type and thickness of the coating on the mold core surface can be adjusted depending on the contact lens material. For highly hydrophilic materials, fluoropolymer coatings are recommended due to their good anti-stick properties and chemical corrosion resistance. For applications requiring high hardness and wear resistance, diamond-like carbon (DLC) coatings can effectively improve the durability of the mold surface.

[0032] Meanwhile, tiny air-guiding channels can be further added to the edge area of ​​the molding groove. Combined with the low-friction properties of the coating, this facilitates material flow, improves the venting effect in the edge area, and prevents air bubbles from accumulating during the molding process. Through microstructure surface treatment technology, the mold surface can be endowed with superhydrophobic properties, enhancing venting efficiency and ensuring high-precision contact lens molding quality.

[0033] Working principle and usage process of this utility model:

[0034] Installing the mold core: First, the optimized copper mold core is installed on the contact lens production equipment through the fixing ear 12 to ensure that the mold core is stably positioned during the molding process.

[0035] Injection molding: During the production process, contact lens materials such as silicone hydrogel are injected into the molding groove 11 through injection molding or casting. The material flows within the mold and gradually fills the molding groove, while the gas inside the mold is discharged through the venting micropores 2 and venting grooves 3.

[0036] Venting process: During material filling, the venting design of the mold core plays a crucial role. Gas flows smoothly out through venting micropores 2 and venting grooves 3, preventing air bubbles from forming in the material. The molding groove edge area, treated with a microstructure surface, effectively promotes gas venting and prevents air bubbles from accumulating in non-micropore areas.

[0037] Material curing: The excellent thermal conductivity of the copper mold core helps the molding material cool quickly and evenly, ensuring uniform curing of the contact lens material. This high thermal conductivity also accelerates heat dissipation within the mold, shortening the production cycle.

[0038] Demolding: After molding, the contact lens material can be easily demolded through a low-affinity fluoropolymer coating or a diamond-like carbon coating, without adhering to the mold surface. Demolding yields high-quality contact lens products with a smooth, flawless surface and excellent optical performance.

[0039] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A copper mold core for solving mold venting, characterized in that, include: The mold core column (1) is a cylindrical structure used to support the entire mold structure; A molding groove (11) is provided on the top of the mold core column (1) for molding the optical surface of the contact lens. The molding groove has a high-precision smooth surface. At least one exhaust microhole (2) is provided on the inner side of the inner wall of the molding groove (11) for venting gas from the mold during the molding process; At least one venting groove (3) is provided on the side of the mold core column (1). The interior of the mold core column (1) is provided with a flow channel for connecting the venting micro-hole (2) and the venting groove (3). The venting groove (3) is used to discharge gas from the mold during the molding process. At least one fixing lug (12) is provided at the bottom of the mold core column (1) for mounting the mold core on the production equipment and ensuring its stability.

2. The copper mold core for solving mold venting according to claim 1, characterized in that, The surface of the molding tank (11) is coated with a low-affinity coating to reduce the affinity of the liquid to the surface of the molding tank and improve the demolding effect. The coating is a fluoropolymer coating or a diamond-like carbon (DLC) coating.

3. A copper mold core for solving mold venting according to claim 1, characterized in that, The surface of the molding groove (11) is also treated with microstructure, forming a superhydrophobic surface through microtexturing or nanocoating technology, which promotes venting in the edge area and prevents the accumulation of bubbles in the area without venting micropores (2).

4. A copper mold core for solving mold venting according to claim 2, characterized in that, The thickness of the coating is controlled between 0.5 micrometers and 5 micrometers to ensure the uniformity of the coating and not affect the optical accuracy of the molding groove (11) surface and the molding quality of the contact lens.

5. A copper mold core for solving mold venting according to claim 1, characterized in that, The diameter of the exhaust micropores (2) ranges from 0.01 mm to 0.02 mm, and is used to precisely exhaust gas during the molding process while preventing material from entering the micropores.

6. A copper mold core for solving mold venting according to claim 1, characterized in that, The exhaust groove (3) has a width ranging from 0.01 mm to 0.05 mm and a depth ranging from 0.02 mm to 0.1 mm, which can effectively exhaust gas without causing material to overflow.

7. A copper mold core for solving mold venting according to claim 1, characterized in that, The forming groove (11) is made by high-precision numerical control (CNC) machining and polishing process to ensure that the optical surface of the contact lens has a high degree of smoothness.

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