CN113001833A - Buckle type mold for producing silicon hydrogel contact lens and molding method thereof - Google Patents
Buckle type mold for producing silicon hydrogel contact lens and molding method thereof Download PDFInfo
- Publication number
- CN113001833A CN113001833A CN202110183246.7A CN202110183246A CN113001833A CN 113001833 A CN113001833 A CN 113001833A CN 202110183246 A CN202110183246 A CN 202110183246A CN 113001833 A CN113001833 A CN 113001833A
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- Prior art keywords
- die
- mold
- upper die
- lower die
- hydrogel contact
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- 239000000017 hydrogel Substances 0.000 title claims abstract description 40
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 25
- 239000010703 silicon Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000000465 moulding Methods 0.000 title description 2
- 238000001746 injection moulding Methods 0.000 claims abstract description 32
- 229920001296 polysiloxane Polymers 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/40—Plastics, e.g. foam or rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
- B29K2083/005—LSR, i.e. liquid silicone rubbers, or derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
- B29L2011/0041—Contact lenses
Abstract
The invention relates to a buckle type die for producing silicon hydrogel contact lenses and a forming method thereof, the buckle type die for producing the silicon hydrogel contact lenses comprises an upper die and a lower die, wherein a convex die part is formed on the upper die, a concave die part is formed on the lower die, a lens forming cavity is formed between the convex die part and the concave die part, an annular convex part is formed on the outer side wall of the upper die along the circumferential direction, an annular concave part which is correspondingly matched with the annular convex part of the upper die is formed on the inner side wall of the lower die along the circumferential direction, and when the upper die and the lower die are matched, the annular convex part of the upper die is matched and clamped with the annular concave part of the lower die to limit the axial displacement between the upper die and; the protruding size of the annular convex part of the upper die is not more than 0.1mm, and the concave depth of the annular concave part of the lower die is not more than 0.2 mm. The invention can obviously improve the yield and stability of the full-mold method for producing the silicon hydrogel contact lenses, and the formed lenses have better shapes; the injection molding process is simple, the equipment investment can be reduced, and the production cost of the mold can be reduced.
Description
Technical Field
The invention relates to the technical field of contact lens production molds, in particular to a buckle type mold for producing a silicon hydrogel contact lens and a forming method thereof.
Background
With the development of economy and the progress of society, contact lenses have become necessary for more and more people. In order to improve the production stability of contact lenses and reduce the production cost, the contact lens industry basically adopts a full-mold method for production. Meanwhile, in order to improve the wearing comfort of the contact lenses, the silicone hydrogel contact lenses with high oxygen permeability will become the mainstream in the future. When the full-mold commonly used in the industry is applied to the production of the silicon hydrogel contact lenses, the requirements on the mold are high due to the characteristics of soft materials and the like of the silicon hydrogel lenses, strong adhesion between the molds, difficult demolding, high breakage rate and extremely low production yield. For example, utility model patent No. CN207058998U discloses a contact lens mold, which comprises an upper mold and a lower mold, wherein after the upper and lower molds are pressed together, there is no axial retention device, which can not ensure the tight fitting of the upper and lower molds, and during the curing of the subsequent lenses, the displacement of the upper and lower molds is very easy to be generated, thereby causing the defects of the lenses and leading to the failure of obtaining the qualified lenses. In addition, the mold with the structure has higher requirements on mold injection production equipment, can be produced by a complex injection double-plate mold, has high equipment investment, can obviously improve the mold production cost, cannot be improved on the basis of the existing equipment, and has excessively high equipment change cost.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art and provide a buckle type mold for producing silicon hydrogel contact lenses and a forming method thereof, wherein the buckle type mold can obviously improve the yield and the stability of the silicon hydrogel contact lenses produced by a full-mold method, the formed lenses have better shapes, the injection molding process is simple, the equipment investment can be reduced, and the mold production cost can be reduced.
The invention adopts the following technical scheme:
the buckle type mould for producing the silicon hydrogel contact lens comprises an upper mould and a lower mould, wherein a convex mould part is formed on the upper mould, a concave mould part is formed on the lower mould, when the upper mould is tightly connected with the lower mould, a lens forming cavity is formed between the convex mould part and the concave mould part, an annular convex part is formed on the outer side wall of the upper mould along the circumferential direction, an annular concave part which is correspondingly matched with the annular convex part of the upper mould is formed on the inner side wall of the lower mould along the circumferential direction, and when the upper mould and the lower mould are closed, the annular convex part of the upper mould is matched and clamped with the annular concave part of the lower mould to limit the axial displacement between the upper mould; the protruding size of the annular convex part of the upper die is less than or equal to 0.1mm, and the concave depth of the annular concave part of the lower die is less than or equal to 0.2 mm.
Furthermore, the annular convex part of the upper die and the annular concave part of the lower die are of one-way limiting structures, and a limiting surface which is used for limiting the upper die to move upwards relative to the lower die along the axial direction and is matched with the lower die is formed respectively.
Furthermore, the limiting surfaces of the annular convex part of the upper die and the annular concave part of the lower die are both inclined downwards gradually from the inner side to the outer side.
Furthermore, a lower limiting step is formed at the upper end of the female die part of the lower die, a limiting convex part capable of being arranged on the upper side of the lower limiting step is formed at the upper end of the male die part of the upper die, and the lower limiting step is matched with the limiting convex part and used for limiting the upper die to move downwards along the axial direction relative to the lower die.
Furthermore, a certain gap is reserved between the inner side wall of the upper die and the outer side wall of the lower die.
Furthermore, the upper die is provided with an upper limiting step which can be clamped above the upper end surface of the lower die.
Furthermore, the annular convex part of the upper die and the annular concave part of the lower die form smooth curved surface transition.
Furthermore, the upper die and the lower die are made of plastic materials.
Furthermore, the upper die and the lower die are integrally formed by adopting an injection molding process.
A method of forming a snap-in mold for producing a silicone hydrogel contact lens as described above, comprising the steps of:
firstly, preparing an injection molding double-plate mold, turning a corresponding concave ring at the position of an inner cavity of the upper injection molding double-plate mold corresponding to the annular convex part, and turning a corresponding convex ring at the position of an inner cavity of the lower injection molding double-plate mold corresponding to the annular concave part, so that the inner cavities of the upper injection molding double-plate mold and the lower injection molding double-plate mold respectively form a structure matched with the shapes of the upper mold and the lower mold;
injection molding the upper die and the lower die, wherein the upper die injection double-plate die and the lower film injection double-plate die are respectively used for injection molding the upper die and the lower die through an injection molding process;
demoulding the upper and lower moulds in a strong top mode.
As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are:
firstly, after the upper die and the lower die are pressed, the annular convex part of the upper die can be clamped with the annular concave part of the lower die, so that the upper die and the lower die are fixed, axial displacement cannot be generated between the upper die and the lower die, the yield and the stability of the full-die method for producing the silicon hydrogel contact lenses can be obviously improved, the peripheral thickness of the formed lenses is uniform, and the lenses are better in shape;
secondly, the protruding size of the annular convex part of the upper die is less than or equal to 0.1mm, the concave depth of the annular concave part of the lower die is less than or equal to 0.2mm, and demoulding can be carried out in a strong-top mode during injection molding, so that the process is simple, and the equipment cost can be reduced; when the size of the mold exceeds the size, the annular convex part is obviously deformed by adopting strong-top demolding, the using effect of the mold is influenced, so that demolding cannot be performed in a strong-top mode, an injection molding double-plate mold with a slider and a complex structure needs to be designed for injection molding, and the related equipment cost is obviously increased;
and thirdly, the upper die and the lower die can be molded by adopting the existing double-plate die for injection molding, and only simple turning treatment is carried out on the related position of the inner cavity of the existing double-plate die for injection molding, so that the equipment investment can be greatly reduced, and the production cost of the die is reduced.
Drawings
FIG. 1 is a side sectional view of a lower die of embodiment 1 of the present invention;
FIG. 2 is a side cross-sectional view of an upper die of example 1 of the present invention;
FIG. 3 is a side cross-sectional view of a snap-on mold for producing a silicone hydrogel contact lens of example 1 of the present invention in a closed state of the upper and lower molds;
FIG. 4 is an enlarged view at A in FIG. 3;
fig. 5 is a perspective view of an upper mold of embodiment 1 of the present invention.
In the figure: 1. the lens forming device comprises an upper die, 11 parts of a male die part, 12 parts of an annular convex part, 13 parts of a limiting convex part, 14 parts of an upper limiting step, 121 parts of a first limiting surface, 2 parts of a lower film, 21 parts of a female die part, 22 parts of an annular concave part, 221 parts of a second limiting surface, 23 parts of a lower limiting step, 3 parts of a lens forming cavity and 4 parts of a gap.
Detailed Description
The invention is further described below by means of specific embodiments.
Example 1
Referring to fig. 1 to 5, the snap-in mold for producing a silicone hydrogel contact lens according to the present invention comprises an upper mold 1 and a lower mold 2, wherein the upper mold 1 is formed with a male mold part 11, the lower mold 2 is formed with a female mold part 21, and when the upper mold 1 is tightly attached to the lower mold 2, a lens forming cavity 3 is formed between the male mold part 11 and the female mold part 21. The upper die 1 and the lower die 2 are both made of polystyrene and are integrally formed by adopting an injection molding process.
An annular convex part 12 is formed on the outer side wall of the upper die 1 along the circumferential direction, an annular concave part 22 correspondingly matched with the annular convex part 12 of the upper die 1 is formed on the inner side wall of the lower die 2 along the circumferential direction, and when the upper die 1 and the lower die 2 are closed, the annular convex part 12 of the upper die 1 is matched and clamped with the annular concave part 22 of the lower die 2 to limit the axial displacement between the upper die 1 and the lower die 2; the protruding size of the annular convex part 12 of the upper die 1 is equal to 0.1mm, and the concave depth of the annular concave part 22 of the lower die 2 is equal to 0.2 mm. The annular convex part 12 of the upper die 1 and the annular concave part 22 of the lower die 2 form smooth curved surface transition. The annular convex part 12 of the upper die 1 and the annular concave part 22 of the lower die 2 are of a one-way limiting structure, and a first limiting surface 121 and a second limiting surface 221 which are used for limiting the upper die 1 to move upwards relative to the lower die 2 along the axial direction and are matched with each other are respectively formed. The first and second limiting surfaces 121 and 221 are inclined downward from the inner side to the outer side.
The upper end of the female die part 21 of the lower die 2 is provided with a lower limit step 23, the upper end of the male die part 11 of the upper die 1 is provided with a limit convex part 13 which can be arranged at the upper side of the lower limit step 23, and the lower limit step 23 is matched with the limit convex part 13 and is used for limiting the upper die 1 to move downwards along the axial direction relative to the lower die 2. The upper die 1 is provided with an upper limiting step 14 which can be clamped above the upper end surface of the lower die 2. A certain gap 4 is left between the inner side wall of the upper die 1 and the outer side wall of the lower film 2, and can be used for exhausting gas.
The invention relates to a forming method of a buckle type mould for producing a silicon hydrogel contact lens, which comprises the following steps:
firstly, preparing an injection molding double-plate mold, turning a corresponding concave ring at the position of the inner cavity of the existing upper mold injection double-plate mold corresponding to the annular convex part 12, and turning a corresponding convex ring at the position of the inner cavity of the lower mold injection double-plate mold corresponding to the annular concave part 22, so that the inner cavities of the upper mold injection double-plate mold and the lower mold injection double-plate mold respectively form structures matched with the shapes of the upper mold 1 and the lower mold 2.
Injection molding of the upper die and the lower die, wherein an upper die injection double-plate die and a lower film injection double-plate die are respectively used for injection molding of an upper die 1 and a lower die 2 through an injection molding process; the injection molding process adopts the injection molding process of the contact lens mold in the prior art.
Thirdly, demoulding the upper die 1 and the lower die 2, wherein the upper die 1 and the lower die 2 are demoulded in a strong top mode.
The buckle type mold for producing the silicon hydrogel contact lens is used for preparing the silicon hydrogel contact lens, so that the yield and the stability of the lens preparation can be effectively improved, and the prepared lens is better in shape than the lens prepared by the mold without a buckle fixing structure.
1) The aspect of good product rate: the silicon hydrogel lens is prepared by a die without buckle fixing, and the yield is about 10%; the buckle type mold for producing the silicon hydrogel contact lenses is used for preparing the silicon hydrogel contact lenses, three batches of silicon hydrogel contact lenses are repeatedly prepared, the yield of each batch of 120 silicon hydrogel contact lenses is respectively 56.67 percent, 52.50 percent and 54.17 percent, and the yield of the three batches of lenses is over 50 percent.
2) And (3) stability: the silicon hydrogel lens is prepared by a die without buckle fixation, the fluctuation of the yield is obvious, and the yield fluctuates between 0 and 15 percent in disorder; the buckle type mold for producing the silicon hydrogel contact lens is used for preparing the silicon hydrogel lens, and the yield is basically kept above 50%.
3) The aspect of the lens form: the silicon hydrogel lens is prepared by a mold without buckle fixation, and the problems of uneven thickness around the lens, obvious thickness deviation, easy deformation of the lens and the like are caused by the possibility of unstable deflection when an upper mold and a lower mold are closed; the buckle type mold for producing the silicone hydrogel contact lenses is used for preparing the silicone hydrogel lenses, the annular convex part 12 of the upper mold 1 and the annular concave part 22 of the lower mold 2 form a buckle structure, the relative positions of the upper mold 1 and the lower mold 2 are ensured, the mold closing deflection is small, the thickness of the periphery of the lenses is uniform, and the shape of the lenses is obviously superior to that of a mold without buckles.
Example 2
This example differs from example 1 in that: the protruding size of the annular convex part 12 of the upper die 1 is equal to 0.08mm, and the concave depth of the annular concave part 22 of the lower die 2 is equal to 0.15 mm.
Example 3
This example differs from example 1 in that: the protruding size of the annular convex part 12 of the upper die 1 is equal to 0.06mm, and the concave depth of the annular concave part 22 of the lower die 2 is equal to 0.12 mm.
The above description is only three specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (10)
1. A buckle formula mould for producing silicon hydrogel contact lens which characterized in that: the lens forming device comprises an upper die and a lower die, wherein a convex die part is formed on the upper die, a concave die part is formed on the lower die, when the upper die is tightly connected with the lower die, a lens forming cavity is formed between the convex die part and the concave die part, an annular convex part is formed on the outer side wall of the upper die along the circumferential direction, an annular concave part which is correspondingly matched with the annular convex part of the upper die is formed on the inner side wall of the lower die along the circumferential direction, and when the upper die and the lower die are combined, the annular convex part of the upper die is matched and clamped with the annular concave part of the lower die to limit the axial; the protruding size of the annular convex part of the upper die is less than or equal to 0.1mm, and the concave depth of the annular concave part of the lower die is less than or equal to 0.2 mm.
2. A snap-on mold for producing a silicone hydrogel contact lens as in claim 1, wherein: the annular convex part of the upper die and the annular concave part of the lower die are of one-way limiting structures, and a limiting surface which is used for limiting the upper die to move upwards relative to the lower die along the axial direction and is matched with the lower die is formed respectively.
3. A snap-on mold for producing a silicone hydrogel contact lens as in claim 2, wherein: the limiting surfaces of the annular convex part of the upper die and the annular concave part of the lower die are gradually inclined downwards from the inner side to the outer side.
4. A snap-on mold for producing a silicone hydrogel contact lens as in claim 1, wherein: the upper end of the female die part of the lower die is provided with a lower limiting step, the upper end of the male die part of the upper die is provided with a limiting convex part which can be arranged on the upper side of the lower limiting step, and the lower limiting step is matched with the limiting convex part and used for limiting the upper die to move downwards along the axial direction relative to the lower die.
5. A snap-on mold for producing a silicone hydrogel contact lens as in claim 1, wherein: a certain gap is reserved between the inner side wall of the upper die and the outer side wall of the lower die.
6. A snap-on mold for producing a silicone hydrogel contact lens as in claim 1, wherein: the upper die is provided with an upper limiting step which can be clamped above the upper end surface of the lower die.
7. A snap-on mold for producing a silicone hydrogel contact lens as in claim 1, wherein: and the annular convex part of the upper die and the annular concave part of the lower die form smooth curved surface transition.
8. A snap-on mold for producing a silicone hydrogel contact lens as in claim 1, wherein: the upper die and the lower die are made of plastic materials.
9. The snap-on mold for producing a silicone hydrogel contact lens of claim 1 or 8, wherein: the upper die and the lower die are integrally formed by adopting an injection molding process.
10. A method of forming a snap-in mold for producing a silicone hydrogel contact lens as claimed in any of claims 1 to 9, wherein: the method comprises the following steps:
firstly, preparing an injection molding double-plate mold, turning a corresponding concave ring at the position of an inner cavity of the upper injection molding double-plate mold corresponding to the annular convex part, and turning a corresponding convex ring at the position of an inner cavity of the lower injection molding double-plate mold corresponding to the annular concave part, so that the inner cavities of the upper injection molding double-plate mold and the lower injection molding double-plate mold respectively form a structure matched with the shapes of the upper mold and the lower mold;
injection molding the upper die and the lower die, wherein the upper die injection double-plate die and the lower film injection double-plate die are respectively used for injection molding the upper die and the lower die through an injection molding process;
demoulding the upper and lower moulds in a strong top mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110183246.7A CN113001833A (en) | 2021-02-08 | 2021-02-08 | Buckle type mold for producing silicon hydrogel contact lens and molding method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110183246.7A CN113001833A (en) | 2021-02-08 | 2021-02-08 | Buckle type mold for producing silicon hydrogel contact lens and molding method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113001833A true CN113001833A (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110183246.7A Pending CN113001833A (en) | 2021-02-08 | 2021-02-08 | Buckle type mold for producing silicon hydrogel contact lens and molding method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1982031A (en) * | 2005-12-08 | 2007-06-20 | 纽巴依欧株式会社 | Injection moulding forming machine for contact lens die |
| CN101229667A (en) * | 2008-02-22 | 2008-07-30 | 广州保视宁光学产品有限公司 | Contact lenses plastics mould used for semi-lathe production and manufacturing method thereof |
| CN204222086U (en) * | 2014-06-23 | 2015-03-25 | 协诚钢模股份有限公司 | Buckle type contact lens mould |
| KR20160004031A (en) * | 2014-07-02 | 2016-01-12 | 정성윤 | Mold for Manufacturing Contact Lens |
| TWM562987U (en) * | 2018-03-31 | 2018-07-01 | 林承翰 | Concave and convex mold for contact lens |
-
2021
- 2021-02-08 CN CN202110183246.7A patent/CN113001833A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1982031A (en) * | 2005-12-08 | 2007-06-20 | 纽巴依欧株式会社 | Injection moulding forming machine for contact lens die |
| CN101229667A (en) * | 2008-02-22 | 2008-07-30 | 广州保视宁光学产品有限公司 | Contact lenses plastics mould used for semi-lathe production and manufacturing method thereof |
| CN204222086U (en) * | 2014-06-23 | 2015-03-25 | 协诚钢模股份有限公司 | Buckle type contact lens mould |
| KR20160004031A (en) * | 2014-07-02 | 2016-01-12 | 정성윤 | Mold for Manufacturing Contact Lens |
| TWM562987U (en) * | 2018-03-31 | 2018-07-01 | 林承翰 | Concave and convex mold for contact lens |
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Application publication date: 20210622 |