Contact lens male and female shell membrane common mold injection molding device and method thereof

Abstract

The invention provides a contact lens male and female shell mold common mold injection molding device and method, the contact lens male and female shell mold common mold injection molding device comprises an upper mold and a lower mold, the upper mold is composed of an upper fixing plate, a female mold core and a female mold pressing block, and the lower mold is composed of a lower fixing plate, a male mold core and an ejector block. The female die core and the male die core are accurately positioned through the 0-degree positioning block, the 0-degree positioning groove, the guide sleeve and the guide column, so that the matching precision between the dies is ensured. An injection molding runner and a cooling water path system are arranged in the mold, so that material flowing and mold temperature in the injection molding process are controlled, and shell film deformation is reduced. Precise positioning of the female mold core and the male mold core, injection molding process, mold cooling and temperature control, and finished product numbering and quality inspection. By optimizing the mold structure and the injection molding process, the pairing precision, the production efficiency and the finished product quality stability of the male shell film and the female shell film of the contact lenses are improved, the defective rate is reduced, and the traceability and the management level of products are enhanced. According to the technical scheme, the comfort, the oxygen permeability and the visual effect of the contact lens are improved, and the market competitiveness is improved.

Description

Technical Field

[0001] The invention relates to the technical field of contact lens male and female shell membrane processing, in particular to a contact lens male and female shell membrane common mold injection molding device and method. Background Art

[0002] Contact lenses are a widely used vision correction product, usually made of special materials to be comfortable to wear and meet the needs of daily use. Its structure usually includes a shell made of hard or soft materials, which is used to wrap the eyes to protect and correct vision. The shell of the contact lens is usually divided into two parts, a male mold and a female mold, and is produced by mold injection molding. The matching accuracy between the male mold and the female mold directly affects the comfort, oxygen permeability, visual quality and wearing effect of the contact lens.

[0003] The traditional method of forming male and female contact lens shells is mainly achieved through mold injection technology, using a single mold or multiple molds in a linked production mode. The molding of male and female molds usually relies on manual or mechanical positioning and assembly, which has a certain risk of error, which may lead to shell size deviation and inaccurate pairing, thus affecting the quality and comfort of the product. In order to improve production efficiency and finished product quality, injection molding devices and processes need to be further optimized. Summary of the invention

[0004] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a contact lens male and female shell membrane common mold injection molding device and method, so as to improve molding efficiency and enhance pairing accuracy.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A contact lens male and female shell membrane common mold injection molding device and method, comprising an upper mold and a lower mold;

[0007] The upper mold includes an upper fixed plate, a female mold core, and a female mold pressing block; the female mold core is placed between the upper fixed plate and the female mold pressing block; the female mold pressing block is fixedly connected to the upper fixed plate to fix the female mold core on the upper fixed plate; a female mold insert and a male mold insert are arranged on the female mold core;

[0008] The lower mold includes a lower fixed plate, a male mold core, and a top block; the male mold core is placed between the lower fixed plate and the top block; the top block is fixedly connected to the lower fixed plate to fix the male mold core on the lower fixed plate; the male mold core is provided with a male mold insert and a female mold insert that match the female mold insert and the male mold insert on the female mold core; the female mold pressing block and the top block are both provided with injection runners.

[0009] Preferably, cooling water channels are provided in both the upper fixing plate and the lower fixing plate.

[0010] Preferably, both the upper fixing plate and the lower fixing plate are provided with code holes.

[0011] Preferably, a 0° positioning block is provided on the female mold core, and a 0° positioning groove matching with the 0° positioning block is provided on the male mold core.

[0012] Preferably, a guide sleeve is provided on the female mold core; and a guide column adapted to the guide sleeve is fixedly provided on the male mold core.

[0013] A method for producing male and female shell membranes of a contact lens using a common mold injection molding device for male and female shell membranes of a contact lens comprises the following steps:

[0014] a) Fixing the mother mold core on the upper fixing plate through the mother mold pressing block;

[0015] b) Fix the male mold core on the lower fixing plate through the top block;

[0016] c) The male mold plate and the female mold plate are accurately installed and matched through guide sleeves and guide pillars, and the male mold core and the female mold core are accurately positioned through 0° positioning blocks and 0° positioning grooves;

[0017] d) starting the injection molding process on the injection molding machine to produce the male and female shell membranes simultaneously;

[0018] e) Cooling and temperature control through the water system inside the mold;

[0019] f) Take out the completed male and female shell membranes and transfer them to the next process.

[0020] Preferably, the injection molding process comprises the following steps:

[0021] a) Set the temperature, pressure, injection speed and cooling time of the injection molding machine according to the contact lens shell film material;

[0022] b) After the mold is closed, the molten material is injected into the mold cavity through the injection molding machine, and the male and female shell membranes are formed at the same time;

[0023] c) After the mold is cooled, the mold is automatically opened and the formed male and female shell membranes are taken out.

[0024] Preferably, the cooling and temperature control step comprises:

[0025] a) Cooling the mold through cooling water channels;

[0026] b) Adjust the water inlet temperature and flow rate of the cooling water circuit to ensure that the mold temperature is maintained within the set range;

[0027] c) Monitor the mold temperature in real time to avoid deformation of the shell membrane due to overheating or overcooling.

[0028] Preferably, the method further comprises the following steps:

[0029] a) Uniquely number and identify the male and female shell membranes after production;

[0030] b) Check the matching accuracy of male and female shell membranes to ensure that they meet product quality requirements;

[0031] c) The qualified male and female shell membranes are directly transferred to the production line for subsequent processing, or temporarily stored in the line side warehouse for use;

[0032] d) Record production batch information and establish a product traceability management system.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] By precisely positioning the female mold core and the male mold core, the alignment accuracy of the male mold insert and the female mold insert is ensured, thereby greatly reducing the pairing error, improving the quality of the contact lens shell membrane, and ensuring better wearing comfort and visual effects. The improvement of pairing accuracy helps to reduce defects such as light leakage and bubbles, and ensure the sealing and oxygen permeability of the contact lens. The optimized mold structure and precise positioning method reduce manual intervention and adjustment time in the production process, and improve the automation level of the production line. The male and female shell membranes can be formed in a single mold closure, shortening the production cycle, reducing the overall manufacturing cost and production time, and increasing the production capacity of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the upper mold in the present invention;

[0036] Figure 2 It is a structural schematic diagram of the lower mold in the present invention.

[0037] in:

[0038] 1. Upper fixed plate; 2. Guide sleeve; 3. Female mold core; 4. Female mold insert; 5. Positioning block; 7. Male mold insert; 8. Female mold pressure block; 9. Injection runner; 10. Cooling water channel; 11. Mold hole; 12. Lower fixed plate; 13. Guide column; 14. Top block; 15. Positioning groove; 16. Male mold core. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] like Figure 1 , Figure 2 As shown, a contact lens male and female shell membrane common mold injection molding device includes an upper mold and a lower mold;

[0041] The upper mold includes an upper fixed plate 1, a female mold core 3, and a female mold pressing block 8; the female mold core 3 is placed between the upper fixed plate 1 and the female mold pressing block 8; the female mold pressing block 8 is fixedly connected to the upper fixed plate 1 to fix the female mold core 3 on the upper fixed plate 1; a female mold insert 4 and a male mold insert 7 are provided on the female mold core 3;

[0042] The lower mold includes a lower fixed plate 12, a male mold core 16, and a top block 14; the male mold core 16 is placed between the lower fixed plate 12 and the top block 14; the top block 14 is fixedly connected to the lower fixed plate 12, and the male mold core 16 is fixed to the lower fixed plate 12; the male mold core 16 is provided with a male mold insert 7 and a female mold insert 4 that match the female mold insert 4 and the male mold insert 7 on the female mold core 3; the female mold pressing block 8 and the top block 14 are provided with an injection flow channel 9. The upper fixed plate 1 and the lower fixed plate 12 are both provided with a cooling water channel 10. The upper fixed plate 1 and the lower fixed plate 12 are both provided with a code mold hole 11. The female mold core 3 is provided with a 0° positioning block 5, and the male mold core 16 is provided with a 0° positioning groove 15 that matches the 0° positioning block 5. The female mold core 3 is provided with a guide sleeve 2; the male mold core 16 is fixedly provided with a guide column 13 that matches the guide sleeve 2.

[0043] A method for producing male and female shell films of a contact lens using a common mold injection molding device for male and female shell films of a contact lens comprises the following steps:

[0044] The female mold core 3 is fixed on the upper fixed plate 1 through the female mold pressing block 8;

[0045] The male mold core 16 is fixed on the lower fixing plate 12 through the top block 14;

[0046] The male mold plate and the female mold plate are accurately installed and matched through the guide sleeve and the guide column 13, and the male mold core 16 and the female mold core 3 are accurately positioned through the 0° positioning block 5 and the 0° positioning groove 15;

[0047] Start the injection molding process on the injection molding machine to produce male and female shell membranes at the same time;

[0048] Cooling and temperature control through the water system inside the mold;

[0049] Take out the finished male and female shell membranes and transfer them to the next process.

[0050] The injection molding process includes the following steps:

[0051] Set the temperature, pressure, injection speed and cooling time of the injection molding machine according to the contact lens shell film material;

[0052] After the mold is closed, the molten material is injected into the mold cavity through the injection molding machine, and the male and female shell membranes are formed at the same time;

[0053] After the mold is cooled, the mold is automatically opened and the formed male and female shell membranes are taken out;

[0054] The cooling and temperature control steps include:

[0055] The mold is cooled through the cooling water channel 10;

[0056] Adjust the water inlet temperature and flow rate of the cooling water channel 10 to ensure that the mold temperature is maintained within the set range;

[0057] Monitor the mold temperature in real time to avoid deformation of the shell membrane due to overheating or overcooling;

[0058] Also includes:

[0059] Uniquely number and identify the male and female shell membranes after production;

[0060] Check the matching accuracy of male and female shell membranes to ensure that they meet product quality requirements;

[0061] The qualified male and female shell membranes are directly transferred to the production line for subsequent processing, or temporarily stored in the line side warehouse for future use;

[0062] Record production batch information and establish a product traceability management system.

[0063] Implementation 1:

[0064] Injection molding method for male and female contact lens shell membranes - integrated production method:

[0065] Set the injection molding machine temperature, injection pressure, injection speed and cooling time to ensure that the material is fully melted and flows smoothly.

[0066] After the mold is closed, the molten material is injected into the space between the female mold core 3 and the male mold core 16 through the injection flow channel 9 to form the male and female shell membranes of the contact lens.

[0067] Cooling is performed through the cooling water channel 10 system to ensure that the temperature of the mold and the shell film is stable and to avoid deformation.

[0068] After the mold is cooled, it will open automatically to extract the formed male and female shell membranes.

[0069] Finished products are numbered and the matching accuracy is checked to ensure that the quality meets the standards.

[0070] Qualified male and female shell membranes are directly transferred to the production line for further processing, or stored in the online side warehouse for standby use.

[0071] Record production batch information and establish a product traceability management system.

[0072] Implementation 2:

[0073] Injection molding method for male and female contact lens shell membranes - staged production method:

[0074] First, the female mold core 3 is molded: the injection molding machine is set to appropriate temperature and pressure to close the mold in the female mold core 3 area and inject the female mold insert 4 and the male mold insert 7.

[0075] Then, the female mold core 3 is taken out, and the mold surface is cleaned, and similar steps are repeated to form the male mold core 16 .

[0076] The female mold core 3 and the male mold core 16 are precisely matched, the mold is closed again, and the injection molding runner 9 is used to complete the molding of the male and female shell membranes.

[0077] During the cooling process of the mold, the temperature is controlled through the cooling water channel 10 system to ensure the stability of the shell film size and avoid deformation.

[0078] After completing the male and female shell membranes, we will conduct numbering and pairing accuracy checks to ensure that the product quality meets the standards.

[0079] Qualified male and female shell membranes are directly transferred to the production line for subsequent processing or storage.

[0080] Record relevant information of each production batch to achieve product traceability management.

[0081] These two implementations provide different production strategies, which are respectively suitable for single-stage or multi-stage processes to ensure efficient and precise manufacturing of male and female shell films of contact lenses.

Claims

1. A contact lens male and female shell membrane common mold injection molding device, comprising an upper mold and a lower mold, wherein the upper mold and the lower mold are combined to form a plurality of molding cavities, the molding cavities include two groups of specifications, and the plurality of molding cavities are regularly arranged.

2. A contact lens male and female shell film common mold injection molding device as claimed in claim 1, characterized in that: Including upper die and lower die; The upper mold comprises an upper fixed plate (1), a female mold core (3), and a female mold pressing block (8); the female mold core (3) is placed between the upper fixed plate (1) and the female mold pressing block (8); the female mold pressing block (8) is fixedly connected to the upper fixed plate (1) to fix the female mold core (3) on the upper fixed plate (1); a female mold insert (4) and a male mold insert (7) are arranged on the female mold core (3); The lower mold comprises a lower fixed plate (12), a male mold core (16), and a top block (14); the male mold core (16) is placed between the lower fixed plate (12) and the top block (14); the top block (14) is fixedly connected to the lower fixed plate (12) to fix the male mold core (16) on the lower fixed plate (12); the male mold core (16) is provided with a male mold insert (7) and a female mold insert (4) that match the female mold insert (4) and the male mold insert (7) on the female mold core (3); the female mold pressing block (8) and the top block (14) are both provided with injection flow channels (9); The female mold insert (4) and the male mold insert (7) on the female core (3) and the male mold insert (7) and the female mold insert (4) on the male mold core (16) are correspondingly combined to form two groups of molding cavities, and the two groups of molding cavities are spaced apart.

3. A contact lens male and female shell membrane common mold injection molding device as claimed in claim 2, characterized in that: Cooling water channels (10) are provided in both the upper fixing plate (1) and the lower fixing plate (12).

4. A contact lens male and female shell film common mold injection molding device as claimed in claim 2, characterized in that: The upper fixing plate (1) and the lower fixing plate (12) are both provided with code holes (11).

5. A contact lens male and female shell film common mold injection molding device as claimed in claim 2, characterized in that: The female mold core (3) is provided with a 0° positioning block (5), and the male mold core (16) is provided with a 0° positioning groove (15) matched with the 0° positioning block (5).

6. A contact lens male and female shell film common mold injection molding device as claimed in claim 2, characterized in that: The female mold core (3) is provided with a guide sleeve (2); and the male mold core (16) is fixedly provided with a guide column (13) adapted to the guide sleeve (2).

7. A method for producing male and female shell membranes of contact lenses by a common mold injection molding device for male and female shell membranes of contact lenses, characterized in that: The following steps are involved: a) fixing the female mold core (3) on the upper fixing plate (1) by means of a female mold pressing block (8); b) fixing the male mold core (16) on the lower fixing plate (12) through the top block (14); c) accurately assembling and matching the male mold plate and the female mold plate through the guide sleeve and the guide column (13), and accurately positioning the male mold core (16) and the female mold core (3) through the 0° positioning block (5) and the 0° positioning groove (15); d) starting the injection molding process on the injection molding machine to produce the male and female shell membranes simultaneously; e) Cooling and temperature control through the water system inside the mold; f) Take out the completed male and female shell membranes and transfer them to the next process.

8. The method for producing male and female shell membranes for contact lenses by a common mold injection molding device for male and female shell membranes for contact lenses according to claim 7, characterized in that: The injection molding process comprises the following steps: a) Set the temperature, pressure, injection speed and cooling time of the injection molding machine according to the contact lens shell film material; b) After the mold is closed, the molten material is injected into the mold cavity through the injection molding machine, and the male and female shell membranes are formed at the same time; c) After the mold is cooled, the mold is automatically opened and the formed male and female shell membranes are taken out.

9. The method for producing male and female shell membranes for contact lenses by a common mold injection molding device for male and female shell membranes for contact lenses according to claim 8, characterized in that: The cooling and temperature control step comprises: a) cooling the mold through a cooling water channel (10); b) adjusting the water inlet temperature and flow rate of the cooling water circuit (10) to ensure that the mold temperature is maintained within a set range; c) Monitor the mold temperature in real time to avoid deformation of the shell membrane due to overheating or overcooling.

10. The method for producing male and female shell membranes for contact lenses by using a common mold injection molding device for male and female shell membranes for contact lenses according to claim 6, characterized in that: The following steps are also included: a) Uniquely number and identify the male and female shell membranes after production; b) Check the matching accuracy of male and female shell membranes to ensure that they meet product quality requirements; c) The qualified male and female shell membranes are directly transferred to the production line for subsequent processing, or temporarily stored in the line side warehouse for use; d) Record production batch information and establish a product traceability management system.

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