KR100602730B1 - Soft contact lens manufacture system - Google Patents

Abstract

It aims to solve the problem that the curing time of the monomer is long, the cutting processing time of the lens after curing is long, and the consumption of the monomer is high.

Yaw, assembling the iron core to the concave mold, and then assembling the convex mold, and injecting, solidifying and separating the molten polypropylene into the formwork insert of the electrically assembled mold to form the outer formwork;

Forming a pair of inner and outer molds by molding the inner formwork in the same manner as the method of forming the outer formwork and injecting the raw material of the lens into the recesses of the outer formwork and assembling the inner formwork and curing at 100 ~ 110 ℃. Method of manufacturing a soft contact lens by a mold to separate the internal and external formwork after each degree.

Soft contact lens manufacturing method

Description

Soft contact lens manufacturing method by mold {SOFT CONTACT LENS MANUFACTURE SYSTEM}

1 is a view showing a soft contact lens manufactured by the present invention;

2 is a process chart showing a method for manufacturing a soft contact lens according to the present invention;

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The present invention relates to a method for manufacturing a soft contact lens by a mold, and more particularly, by forming an inclined surface at a predetermined angle on a convex mold having a precise lens contact surface to precisely form the curvature of the concave surface of the contact lens, It is formed by polymerizing the convex surface of the contact lens on the contact surface of the lens convex, and fixing the convex mold on the shelf jig to cut and process the convex surface of the contact lens, which is very useful and effective for mass production of precise and sophisticated contact lenses. It relates to a soft contact lens manufacturing method.

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In general, the method for manufacturing a soft contact lens takes a long time to cure the monomer, and the processing time is long by cutting the lens after hardening, and the raw material consumption of the monomer is high.
Accordingly, an object of the present invention is to provide a method for manufacturing a soft contact lens by using a mold capable of greatly reducing the manufacturing and processing time of the soft contact lens and reducing the consumption of monomer.
In order to realize the above object, the present invention describes a manufacturing method according to the present invention, after assembling the concave mold, and then assembled the concave mold, the iron core, the molten poly in the die raw material insert of the electrically assembled mold Injection, solidification and separation of propylene to form the outer formwork,
Forming a pair of inner and outer molds by molding the inner formwork in the same manner as the method of forming the outer formwork and injecting the raw material of the lens into the recesses of the outer formwork and assembling the inner formwork and curing at 100 ~ 110 ℃. After separating the formwork inside and outside is to produce a soft contact lens for each degree.
In addition, a soft contact lens is manufactured by increasing or decreasing the radius of curvature of the convex core so that the frequency can be determined.
In addition, the method of manufacturing a soft contact lens, characterized in that the peak refractive power ± 0.00 ~ ± 25.00 range.

1 is a view showing a contact lens manufactured by a method for manufacturing a soft contact lens by a mold according to the present invention, Figure 2 is a manufacturing process diagram of a method of manufacturing a soft contact lens by a mold according to the present invention.
Components and amounts of the soft contact lens according to the present invention are as follows.
The raw materials and components are 2-HEMA (98.7% 2-Hydroxyethyl methacrylate, 1.3% Ethylene glycol dimethacrylate), and AIBN (2,2'-Azobisisobutyronitrile) is used as an initiator.
In addition, the optimum radius of curvature is 7.80-9.40mm, the peak refractive index (Diopter) is ± 0.00 ~ ± 25.00 (25step), the weight is 0.02-0.04g, the thickness is 0.04-0.09mm.
Referring to the manufacturing process according to the present invention, after assembling the uneven core to the concave mold, the convex mold is assembled there.
Thereafter, polypropylene is injected into the assembled mold, and the mold is disassembled after a predetermined time.
When the mold is disassembled, the outer formwork and the inner formwork, which are injection moldings made from the mold, are manufactured, and the raw material is injected into the outer formwork.
After the raw material is injected into the outer formwork, the inner formwork is combined and cured at 100-110 ℃ for 7 minutes.
After the hardening of the raw material to separate the internal and external dies and to cut and remove the soft contact lens in the hardened state, the separation of the internal and external dies by pressing the cured injection molding with a press to separate the lens in the injection.

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The soft contact lens is separated and inspected for surface inspection, wetting, breakage and bubbles, and sterilized by heating at a temperature of 100 ° C. for 2 hours in a beaker containing saline.
Then, after sterilization treatment at 121 ℃ and inspecting the frequency and packaging, the contact lens is completed.

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Here, the raw material is prepared by mixing 2HEMA 98.7%, EDMA 1.3%, and initiator (AIBN) in an Erlenmeyer flask as described above using a hot plate and a magnetic bar for 24 hours.

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In addition, the curing of the raw material is cured while placing the internal and external formwork, which is an injection molding product, on a conveyor belt and transferring it for 7 minutes at a temperature of 100-110 ° C.

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The surface inspection is performed with a magnifying glass and a dial gauge, and the wetness is a step of swelling a dry lens in saline solution.

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Sterilization is carried out for 30 minutes at 121 ℃ the lens in the vial in the sterilizer.
Table 1 below is a table showing the time according to the conventional lathe cutting, half-molding and the production method of the present invention.

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As described above, the present invention can shorten the molding time from 30 minutes to 7 minutes, reduce the processing time per one soft contact lens from 1 day to 47 seconds, and reduce the consumption of monomer to 1/10. There is an advantage to this.

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Claims (3)

delete In other words, after assembling the iron core to the concave mold, assembling the convex mold, and injecting, solidifying and separating molten polypropylene into the mold raw material insert of the electrically assembled mold to form an outer formwork, and the outer formwork Forming a pair of internal and external formwork by molding the inner formwork in the same manner as the method of forming a mold and injecting the raw material of the lens into the recess of the outer formwork, and then assembling the inner formwork and curing at 100 ~ 110 ℃. In the soft contact lens manufacturing method by a mold to be separated and produced for each frequency, How to determine the frequency by increasing or decreasing the radius of curvature of the convex iron core, wherein the frequency range of the peak refractive power ± 0.00 ~ ± 25.00 soft contact lens manufacturing method characterized in that the mold. delete

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