CN214645276U - Contact lens mold assembly - Google Patents
Contact lens mold assembly Download PDFInfo
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- CN214645276U CN214645276U CN202023035902.9U CN202023035902U CN214645276U CN 214645276 U CN214645276 U CN 214645276U CN 202023035902 U CN202023035902 U CN 202023035902U CN 214645276 U CN214645276 U CN 214645276U
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Abstract
The utility model relates to a contact lens mould sub-assembly. A contact lens mold assembly comprised of an upper mold and a lower mold, said lower mold comprising: a base and a trapezoidal cylinder; the lower end of the trapezoidal cylinder is connected with the base, and the inside of the upper end of the trapezoidal cylinder is provided with a three-layer stepped spherical groove which is divided into a first layer, a second layer and a third layer; the spherical part, namely the lens layer, is arranged below the third layer of the groove; a corner material layer is arranged between the second layer and the third layer; a buffer layer is arranged between the first layer and the second layer; the upper die is a trapezoidal cylinder, and a three-layer stepped convex hemisphere is arranged inside the lower end of the trapezoidal cylinder of the upper die; the use of the mold assembly can effectively avoid the damage of the lens, thereby improving the product percent of pass.
Description
The technical field is as follows:
the utility model relates to a contact lens processing technology field, concretely relates to contact lens mould sub-assembly.
Background art:
the production process of the contact lenses mainly comprises a turning method, a centrifugal casting method and a die pressing method, and compared with the turning method and the centrifugal casting method, the die pressing method has the advantages of low labor cost, high yield, high automation degree, higher water content of produced lenses, high comfort level and high qualification rate of products, so most contact lens production enterprises adopt the die pressing method for production at present. The most critical technology for the compression molding process is the mold, all optical parameters are pre-designed on the mold, and then the contact lens material is injected into the mold and is compression molded to form the lens.
Contact lens molds are available in many forms and are typically produced by using a combination of upper and lower molds. At present, most of large enterprises generally adopt a convex mold bean as an upper mold, then match a groove type lower mold, and select different materials of the upper mold and the lower mold to make a lens stay on the convex surface of the upper mold or in the groove of the lower mold, so that the method is suitable for dry piece separation. If the process is adopted for production, the lens needs to be taken out, the upper die and the lower die need to be separated, and the lens and the die need to be separated, so that the operation has one more process, and the lens is easy to damage, thereby causing loss. Under the circumstances, it is necessary to provide a mold assembly suitable for wet sheet demolding, which not only can reduce production processes and save manpower and material resources, but also can effectively reduce the sheet breakage rate, thereby improving the product yield.
The invention content is as follows:
the utility model provides a contact lens mould assembly which can be separated in a wet way. The specific technical scheme is as follows:
a contact lens mold assembly comprised of an upper mold and a lower mold, said lower mold comprising: a base 10 and a trapezoidal cylinder; the height of the trapezoidal cylinder is H, the outer diameter of the base is X, the outer diameter of the upper end of the trapezoidal cylinder is Y, the outer diameter of the lower end of the trapezoidal cylinder is Z, and X is larger than Z and larger than Y;
the lower end of the trapezoidal cylinder is connected with the base, and the inside of the upper end of the trapezoidal cylinder is provided with a three-layer stepped spherical groove which is divided into a first layer 1, a second layer 2 and a third layer 3; a spherical part, namely a lens layer 4, is arranged below the third layer of the groove; a corner material layer 5 is arranged between the second layer and the third layer; a buffer layer 6 is arranged between the first layer and the second layer; the inner diameter of the groove is reduced from top to bottom in sequence;
three parallel first internal threads 9 are arranged on the inner wall between the second layer and the third layer; a step 7 is arranged on the outer edge of the third layer, and the horizontal position of the step is higher than that of the third layer; the bottom of the third layer is provided with a lens optical area 8;
the upper die is a trapezoidal cylinder, the height of the trapezoidal cylinder is h, the outer diameter of the lower end of the trapezoidal cylinder is equal to the outer diameter of the lower die base, namely X, the inner diameter of the lower end is a, the outer diameter of the upper end is b, a is larger than Z, and a is larger than b; the inner part of the lower end of the upper die trapezoidal cylinder is a three-layer stepped convex hemisphere, and three parallel third internal threads 21 are arranged on the inner wall of the trapezoidal cylinder close to the lower end;
the height of each layer of the convex hemisphere of the upper die corresponds to the height of each layer of the spherical groove of the lower die from top to bottom, and no optical parameter is set on the hemisphere.
Preferably, three parallel second internal threads 11 are arranged on the inner wall of the trapezoidal cylinder close to the lower end, 6 evenly distributed convex blocks 12 are arranged on the base corresponding to the second internal threads, and the convex blocks and the second internal threads realize that the lower end of the trapezoidal cylinder is connected with the base.
The operation process of the mold assembly is as follows: injecting a certain amount of liquid lens material into the groove of the lower die, aligning the upper die with the lower die, and pressing down, wherein the liquid level is not higher than the second layer of the lower die after pressing; after curing and forming, pressing the top of the mold to fracture the lens material of the second layer and the lens material of the lens layer below the third layer to obtain separated leftover materials and lenses; and then placing the mold assembly in a demolding solution for hydration, after a period of time, uncovering the upper mold, separating leftover materials from the lower mold, enabling the lens to be located in the groove of the lower mold but not to be adhered to the lower mold, and finally taking out the lens.
The beneficial effects of the utility model reside in that: the lens demoulding process using the mould assembly is completely carried out in the assembly, so that the lens can be effectively prevented from being damaged, and the product percent of pass is improved; and the combined piece is suitable for demoulding of wet sheets, can effectively reduce production procedures and saves manpower and material resources.
Description of the drawings:
FIG. 1 is a schematic view of the lower mold structure of the present invention; in the drawing, 1 represents a first layer, 2 represents a second layer, 3 represents a third layer, 4 represents a lens layer, 5 represents a corner material layer, 6 represents a cushioning layer, 7 represents a step, 8 represents an optical region, 9 represents a first internal thread, 10 represents a base, 11 represents a second internal thread, and 12 represents a bump.
FIG. 2 is a schematic view of the upper mold structure of the present invention; and 21 represents a third internal thread.
The specific implementation mode is as follows:
example (b):
a contact lens mold assembly comprised of an upper mold and a lower mold, said lower mold comprising: a base 10 and a trapezoidal cylinder; the height of the trapezoidal cylinder is H, the outer diameter of the base is X, the outer diameter of the upper end of the trapezoidal cylinder is Y, the outer diameter of the lower end of the trapezoidal cylinder is Z, and X is larger than Z and larger than Y;
the lower end of the trapezoidal cylinder is connected with the base, and the inside of the upper end of the trapezoidal cylinder is provided with a three-layer stepped spherical groove which is divided into a first layer 1, a second layer 2 and a third layer 3; three parallel second internal threads 11 are arranged on the inner wall of the trapezoidal cylinder close to the lower end, 6 evenly distributed lugs 12 are arranged on the base of the lower die, and the lugs are clamped on the outer surfaces of the trapezoidal cylinders of the upper die and the lower die to realize connection with the base; the second internal thread is used by a matched station of the lower die at other stations;
a spherical part, namely a lens layer 4, is arranged below the third layer of the groove; a corner material layer 5 is arranged between the second layer and the third layer; a buffer layer 6 is arranged between the first layer and the second layer; the inner diameter of the groove is reduced from top to bottom in sequence;
three parallel first internal threads 9 are arranged on the inner wall between the second layer and the third layer; a step 7 is arranged on the outer edge of the third layer, and the horizontal position of the step is higher than that of the third layer; the bottom of the third layer is provided with a lens optical area 8; the first internal threads have the effect of improving the adhesive force, and leftover materials can be taken away when the upper die is uncovered.
The upper die is a trapezoidal cylinder, the height of the trapezoidal cylinder is h, the outer diameter of the lower end of the trapezoidal cylinder is equal to the outer diameter of the lower die base, namely X, the inner diameter of the lower end is a, the outer diameter of the upper end is b, a is larger than Z, and a is larger than b; the inner part of the lower end of the upper die trapezoidal cylinder is a three-layer stepped convex hemisphere, and three parallel third internal threads 21 are arranged on the inner wall of the trapezoidal cylinder close to the lower end; the third internal thread is used by a matched station when the upper die is at other stations;
the height of each layer of the convex hemisphere of the upper die corresponds to the height of each layer of the spherical groove of the lower die from top to bottom, and no optical parameter is set on the hemisphere.
Claims (2)
1. A contact lens mold assembly comprised of an upper mold and a lower mold, said lower mold comprising: a base (10) and a trapezoidal cylinder; the height of the trapezoidal cylinder is H, the outer diameter of the base is X, the outer diameter of the upper end of the trapezoidal cylinder is Y, the outer diameter of the lower end of the trapezoidal cylinder is Z, and X is larger than Z and larger than Y;
the lower end of the trapezoidal cylinder is connected with the base, and the inside of the upper end of the trapezoidal cylinder is provided with a three-layer stepped spherical groove which is divided into a first layer (1), a second layer (2) and a third layer (3);
a spherical part, namely a lens layer (4), is arranged below the third layer of the groove; a corner material layer (5) is arranged between the second layer and the third layer; a buffer layer (6) is arranged between the first layer and the second layer; the inner diameter of the groove is reduced from top to bottom in sequence;
three parallel first internal threads (9) are arranged on the inner wall between the second layer and the third layer; a step (7) is arranged on the outer edge of the third layer, and the horizontal position of the step is higher than that of the third layer; the bottom of the third layer is provided with a lens optical area (8);
the upper die is a trapezoidal cylinder, the height of the trapezoidal cylinder is h, the outer diameter of the lower end of the trapezoidal cylinder is equal to the outer diameter of the lower die base, namely X, the inner diameter of the lower end is a, the outer diameter of the upper end is b, a is larger than Z, and a is larger than b; the inner part of the lower end of the upper die trapezoidal cylinder is a three-layer stepped convex hemisphere, and three parallel third internal threads (21) are arranged on the inner wall of the trapezoidal cylinder close to the lower end;
the height of each layer of the convex hemisphere of the upper die corresponds to the height of each layer of the spherical groove of the lower die from top to bottom, and no optical parameter is set on the hemisphere.
2. A contact lens mold assembly as claimed in claim 1, wherein the trapezoidal cylinder of the lower mold has three parallel second internal threads (11) on its inner wall near the lower end; the base of the lower die is provided with 6 evenly distributed convex blocks (12), and the convex blocks are clamped on the outer surfaces of the trapezoidal cylinders of the upper die and the lower die to realize connection with the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023035902.9U CN214645276U (en) | 2020-12-16 | 2020-12-16 | Contact lens mold assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023035902.9U CN214645276U (en) | 2020-12-16 | 2020-12-16 | Contact lens mold assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214645276U true CN214645276U (en) | 2021-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023035902.9U Active CN214645276U (en) | 2020-12-16 | 2020-12-16 | Contact lens mold assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214645276U (en) |
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2020
- 2020-12-16 CN CN202023035902.9U patent/CN214645276U/en active Active
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