CN110341096B - 50% water content contact lens molding die and manufacturing method thereof - Google Patents
50% water content contact lens molding die and manufacturing method thereof Download PDFInfo
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- CN110341096B CN110341096B CN201910622623.5A CN201910622623A CN110341096B CN 110341096 B CN110341096 B CN 110341096B CN 201910622623 A CN201910622623 A CN 201910622623A CN 110341096 B CN110341096 B CN 110341096B
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- 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
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
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- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
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- 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 discloses a 50% water-containing contact lens mould pressing mould and a manufacturing method thereof, wherein a unified PBT mould and a PP mould corresponding to 6 luminosity ranges are designed through a precise calculation algorithm, and a full-luminosity contact lens with a base arc stabilized at 8.4-8.8 mm is obtained by accurately controlling the size of the base arc in the mould, so that the production is ensured, and the efficiency in producing the full-luminosity lens is improved.
Description
Technical Field
The invention relates to a parameter design of a contact lens, in particular to a contact lens mould with 50% water content and a manufacturing method thereof.
Background
Contact lenses, also known as contact lenses, are lenses that are worn on the cornea of the eye to correct vision or protect the eye. It includes three kinds of hard, semi-hard and soft according to the hardness of the material. The processes of molding, centrifuging, turning, mixing and the like are the main methods for producing soft contact lenses. In addition to lathing, other processes require the use of molds to customize the size of the lens.
In chinese patent publication No. CN101564846A, a 55% contact lens mold assembly and a method for manufacturing the same are disclosed, comprising the steps of: the method comprises the following steps of soaking the mold blank in ice water, demolding the mold blank, extracting in a hydration mode, soaking, balancing, inspecting and packaging, and also discloses design parameters of the contact lens mold. The scheme provides a solution for the centrifugal process and the design of the die thereof.
The molding process is usually a full-mold process, i.e., a PBT mold is combined with a PP mold, especially in the processing of contact lens color films. The lens base curve is usually imparted by a PBT mold and the lens optical surface by a PP mold. The traditional mould pressing method is to match one mould with one degree, so that the range of base arcs generated when full-degree lenses are produced by the full-mould pressing method is large, and different PBT moulds are usually replaced for controlling the stability of the base arcs, so that the production efficiency of contact lens color films is low.
Disclosure of Invention
The invention aims to provide a method for manufacturing a contact lens mould with 50% of water content, which designs PP moulds with different size parameters in each focal power interval to correspond to a unified PBT mould, avoids frequent mould replacement in the process of producing contact lenses, and obviously improves the production efficiency of producing the contact lenses by a mould pressing method.
The technical purpose of the invention is realized by the following technical scheme: a method for manufacturing a contact lens mould with 50% water content, which comprises a PP mould for processing an optical surface of a lens and a PBT mould for processing a base cambered surface of the lens, and comprises the following steps:
step1, designing a unified PBT mould, wherein the parameters are as follows:
R1＝BC/(0.9～1.1)k，L1＝L2-(1.5～2.5)*b,R2＝R1+(0.3～0.5)
R1radius of optical zone in PBT mould, expansion ratio of k material, L1Is R1Segment diameter, BC base curve size, L of the target produced lens2Is the total diameter of the PBT mould, b is the edge width, R2Is the edge radius;
step2, determine lens center thickness CT from lens back vertex power D:
CT＝0.13,0.00＞D＞-0.25
＝0.12,-0.50＞D＞-1.75
＝0.11,-2.00＞D＞-3.75
＝0.10,-4.00＞D＞-4.75
＝0.09,-5.00＞D＞-5.75
＝0.08,-6.00＞D＞-6.75
＝0.07,-7.00＞D＞-10.00；
step3, calculating the optical area radius of the PP mould:
R3＝[1000*(1-n)/Fao]/1.25,
wherein the anterior lens surface power Fao is (D-F0)/(1-CT/1000/n F0),
lens back surface diopter F0-1000 x (1-n)/(R)1*1.25),
n is the refractive index of the lens material;
calculating the non-optical radian radius of the PP die:
R4＝-0.1119R3 4+3.5433R3 3-42.032R3 2+221.51R3-430.55
calculating the diameter of the optical area of the PP die:
L3＝-0.0007D5-0.0136D4-0.0917D3-0.2403D2-0.0615D+6.9，
the rise h is 2.7-3.1,
the radian c of the edge area is 6.67 to 6.77,
width L of edge region5＝0.3～0.5，
The total peripheral diameter of the PP die is equal to L2R is as defined above1、R2、R3、R4、L1、L2、L3、L5BC, b, CT, Fao, F0, h, c are all in millimeters.
Through adopting above-mentioned technical scheme, soft contact lens and eyeball complex good poor journey degree direct decision this lens wear the comfort level, use unified PBT mould parameter in this scheme, calculate all the other mould parameters according to lens base arc curvature radius, change PP mould optics district diameter and transition zone radian radius, after setting up marginal degree radian, width, time transition zone thickness and marginal zone thickness change along with different focal powers, preferentially make the base arc of lens and the cooperation of wearer's eyeball cornea curvature phase-match. The wearing comfort of the lens is obviously improved, and the unified PBT mold also effectively avoids the invariance brought by frequently replacing the PBT mold in the traditional mold pressing method, so that the production efficiency of the lens is obviously improved.
The invention also aims to provide a PP die matched with the unified PBT die.
A 50% water content contact lens molding tool wherein the power D is divided into six general intervals: a1: 0-1.00; a2: -1.00 to-2.00; a3: -2.00 to-4.00; a4: -4.00 to-6.00; a5: -6.00 to-8.00; a6: -8.00 to-10.00,
designing a unified PBT mold, wherein the PBT mold is set: r1The radian of the segment is 6.7-7.1, the diameter is 10.0-10.5, R2The radian of the segment is 7.1-7.5, and the diameter of the periphery is 11.40-11.80.
Determining each size data interval of the PP mould according to the focal power range interval:
PP mold setting for interval a1: luminosity range 0-1D, optical zone radius of curvature: 6.80-7.05, non-optical zone curvature: 7.07-7.13, edge curvature: 6.67-6.77, edge width: 0.3-0.4, optical zone diameter: 6.9-7.4, peripheral diameter: 11.20-11.50, loss height: 2.7-3.1;
PP mold setting for interval a 2: luminosity range 1-2D, optical zone radius of curvature: 7.0-7.21, non-optical zone curvature: 7.12-7.18, edge curvature: 6.67-6.77, edge width: 0.3-0.4, optical zone diameter: 6.8-7.3, peripheral diameter: 11.20-11.50, loss height: 2.7-3.1;
PP mold setting for interval a 3: radius of curvature of optical zone: 7.19-7.52, non-optical zone curvature: 7.17-7.23, edge curvature: 6.67-6.77, edge width: 0.3-0.4, optical zone diameter: 6.6-7.1, peripheral diameter: 11.20-11.50, loss height: 2.7-3.1;
PP mold setting for interval a 4: radius of curvature of optical zone: 7.50-7.85, non-optical zone curvature: 7.22-7.28, edge curvature: 6.67-6.77, edge width: 0.4-0.5, optical zone diameter: 6.4-6.8, peripheral diameter: 11.20-11.50, loss height: 2.7-3.1;
PP mold setting for interval a 5: radius of curvature of optical zone: 7.82-8.22, non-optical zone curvature: 7.27-7.33, edge curvature: 6.67-6.77, edge width: 0.4-0.5, optical zone diameter: 6.9-7.4, peripheral diameter: 11.20-11.50, loss height: 2.7-3.1;
PP mold setting for interval a 6: radius of curvature of optical zone: 8.19-8.65, non-optical zone curvature: 7.32-7.38, edge curvature: 6.67-6.77, edge width: 0.4-0.5, optical zone 3 diameter: 6.0-6.4, peripheral diameter: 11.20-11.50, loss height: 2.7-3.1;
by adopting the technical scheme, the mould pressing method for producing the contact lenses is designed and divided into six common luminosity intervals, and the production and processing difficulty is reduced under the condition that the lens parameters are matched with the requirements of wearers.
In conclusion, the invention has the following beneficial effects:
1. a unified PBT mould and a PP mould matched with the PBT mould are determined through an algorithm. The optical surface of the lens endowed by the PBT mold can keep the base curve controlled in a required range, so that the production is ensured, and the efficiency in producing full-gloss lenses is improved;
2. by designing specific die parameters, key matching parameters such as base arc and the like are formulated, and the supporting force of the lens is improved by changing the thickness, so that the base arc of the lens is stabilized. The base curve of the lens can be stabilized on the premise of not changing the softness of the lens.
Drawings
1. FIG. 1 is a schematic view of the mating of a PBT mold and a PP mold according to the invention;
2. FIG. 2 is a schematic view of a PBT mold according to the invention;
3. FIG. 3 is a schematic view of the structure of a PP mold according to the invention;
4. FIG. 4 is a linear plot of lens thickness versus back vertex power in the present invention;
5. FIG. 5 is a linear graph of the radian radius of the non-optical zone of the PP mold of the invention.
Marking: 1. a PP mould; 2. and (3) a PBT mould.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention is further described in detail with reference to the following examples.
Example 1, a method for manufacturing a mold for molding a contact lens with 50% water content, in which a terpolymer HEMA-NVP-MMA is used as a base material for processing a lens, and a refractive index n of the material is 1.417-1.428. Contact lenses belong to the corneal contact lens class and are directly matched with eyeballs. The base curve radius of the lens center and the fitting degree of the eyeball directly influence the wearing comfort of the lens. The central base curve radius of the current contact lens molding lens is distributed between 8.00mm and 9.00mm, and the range is larger according to individual requirements, and for Asian race, the eyeball is suitable for wearing the lens central base curve radius between 8.4mm and 8.8 mm. The mold is used for processing contact lens with 50% water content, the outer diameter of a target lens is 13.8-14.6 mm, and the radius of a central base arc of a molded lens is 8.6 +/-0.2 mm.
As shown in FIG. 1, the contact lens molding method is a method of press-molding a preform by using a PBT mold and a PP mold which are fitted to form a specific cavity. Wherein, the PBT mould is used for endowing the lens basal cambered surface, and the PP mould is used for endowing the lens optical surface.
Step1, firstly, determining PBT mould parameters:
calculating R of the corresponding base cambered surface in the PBT mould according to the lens expansion rate1I.e. R1BC/(0.9-1.1) k, wherein k is the water absorption expansion rate of the material, and the k is 1.23-1.27 through practical measurement verification. Since the proposal aims at producing the lens with the central base arc radius of 8.6 +/-0.2 mm, BC is 8.6 +/-0.2 mm in the proposal, and R is obtained16.01-7.95 mm. In the algorithm, 0.9-1.1 is a correction coefficient, the selected value is 1, R1＝6.7～7.1mm。
The outer diameter of the contact lens is formed by the outer diameter L of the PP die4Determining, therefore, the peripheral diameter L of the PBT mould2Firstly, the outer diameter L of the PP die is calculated4，
L4(13.8 to 14.6)/k is 10.87 to 11.87mm, L in the present embodiment4The value is 11.0-11.5 mm. L is2＝L4+ (0.1-0.3), in this example, the amount of the variable is 0.3mm, and L is finally obtained2＝11.4～11.8mm。
The edge width b is 1.3-1.4 mm. R1Section diameter L1＝L2-b＝10.0～10.5mm。
Edge arc R2＝R1+(0.3～0.5)＝7.1～7.5mm。
Step2, determining the central thickness CT of the lens according to the back vertex focal power D of the lens:
CT＝0.13,0.00＞D＞-0.25
＝0.12,-0.50＞D＞-1.75
＝0.11,-2.00＞D＞-3.75
＝0.10,-4.00＞D＞-4.75
＝0.09,-5.00＞D＞-5.75
＝0.08,-6.00＞D＞-6.75
＝0.07,-7.00＞D＞-10.00；
the linear relationship between CT and D is shown in FIG. 4.
In actual production, the back vertex power is usually set to one degree per 0.25.
Posterior surface power F0 ═ 1000 × (1-n)/(R-1*1.25)；
Anterior surface power Fao ═ (D-F0)/(1-CT/1000/n ═ F0);
radius of curvature R of optical zone3＝[1000*(1-n)/Fao]/1.25。
Non-optical radian radius R of PP (polypropylene) die4：
R4＝-0.1119R3 4+3.5433R3 3-42.032R3 2+221.51R3-430.55；
R4The linear plot of values of (c) is shown in fig. 5.
In the calculation, six molds are set from low to high according to different luminosity, and each mold corresponds to a lens with different powers of low, medium and low, medium and high.
The detailed division is as follows:
determining the diameter of the optical area of the PP die according to the luminosity interval:
L3＝-0.0007D5-0.0136D4-0.0917D3-0.2403D2-0.0615D+6.9，
in the calculation, each is carried in according to DInterval minimum, each interval L3minEach interval L3min(0.5-0.4) obtaining L corresponding to each interval3Is preferred.
The rise h is 2.7-3.1 mm;
the radian c of the edge area is 6.67-6.77 mm;
width L of edge region5＝0.3～0.5mm。
Example 2, a 50% water content contact lens molding tool comprising a PBT tool for imparting a base curve to a lens and a PP tool for imparting an optical surface to a lens.
According to different luminosity, six molds are set from low to high, and each mold corresponds to a lens with different powers of low, medium and low, medium and high. And when calculating each mold parameter, substituting the lower limit value and the upper limit value of each range interval, and calculating the parameter interval value of the PP mold corresponding to each luminosity range.
The parameters of the PP mould were obtained as follows:
| item | A1 | A2 | A3 | A4 | A5 | A6 |
| Optical zone curvature | 6.80-7.05 | 7.0-7.21 | 7.19-7.52 | 7.50-7.85 | 7.82-8.22 | 8.19-8.65 |
| Rise of rise | 2.7-3.1 | 2.7-3.1 | 2.7-3.1 | 2.7-3.1 | 2.7-3.1 | 2.7-3.1 |
| Curvature of non-optical zone | 7.07 to 7.13 | 7.12-7.18 | 7.17-7.23 | 7.22-7.28 | 7.27-7.33 | 7.32-7.38 |
| Arc of edge | 6.67—6.77 | 6.67—6.77 | 6.67—6.77 | 6.67—6.77 | 6.67—6.77 | 6.67—6.77 |
| Width of edge | 0.3-0.4 | 0.3-0.4 | 0.4-0.5 | 0.4-0.5 | 0.4-0.5 | 0.4-0.5 |
| Optical zone diameter | 6.9-7.4 | 6.8-7.3 | 6.6-7.1 | 6.4-6.8 | 6.2-6.6 | 6.0-6.4 |
| Peripheral diameter | 11.00-11.50 | 11.00-11.50 | 11.00-11.50 | 11.00-11.50 | 11.00-11.50 | 11.00-11.50 |
Unit (mm)
Set for unified PBT mould and above-mentioned PP mould cooperation, the PBT mould is set for: r1The radian of the segment is 6.7-7.1mm, the diameter is 10.0-10.5mm, R2The radian of the segment is 7.1-7.5mm, and the peripheral diameter is 11.40-11.80 mm.
Comparative example:
taking PP die parameters in the traditional design scheme:
| item | A1 | A2 | A3 | A4 | A5 | A6 |
| Optical zone curvature | 6.90-7.25 | 7.1-7.31 | 7.19-7.62 | 7.40-7.45 | 7.52-8.12 | 8.09-8.75 |
| Rise of rise | 2.7-3.1 | 2.7-3.1 | 2.7-3.1 | 2.7-3.1 | 2.7-3.1 | 2.7-3.1 |
| Curvature of non-optical zone | 7.17-7.23 | 7.22-7.38 | 7.27-7.33 | 7.22-7.38 | 7.27-7.43 | 7.42-7.58 |
| Arc of edge | 6.67—6.77 | 6.67—6.77 | 6.67—6.77 | 6.67—6.77 | 6.67—6.77 | 6.67—6.77 |
| Width of edge | 0.3-0.4 | 0.3-0.4 | 0.3-0.4 | 0.3-0.4 | 0.3-0.4 | 0.3-0.4 |
| Optical zone diameter | 6.92-7.48 | 6.7-7.2 | 6.7-7.3 | 6.5-6.9 | 6.3-6.8 | 6.1-6.5 |
| Peripheral diameter | 11.00-11.50 | 11.00-11.50 | 11.00-11.50 | 11.00-11.50 | 11.00-11.50 | 11.00-11.50 |
Unit (mm)
In a comparative test of 2000 sets of products, the mold assembly of example 2 had a product failure rate of 0.65%, while the mold assembly of this comparative example had a product failure rate of 4.3%. And since one PBT mold per PP mold is required in conventional molds, the comparative mold set consumed 1.43 times as much time as the mold set in example 2 in a comparative test producing 6000 sets of full gloss 50% contact lens (1000 sets per photometric interval).
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (2)
1. A method for manufacturing a contact lens mould with 50% water content comprises a PP mould for processing an optical surface of a lens and a PBT mould for processing a base cambered surface of the lens,
step1, designing a unified PBT mould, wherein the parameters are as follows:
R1＝BC/(0.9～1.1)k，L1＝L2-(1.5～2.5)*b,R2＝R1+(0.3～0.5)
R1radius of optical zone in PBT mould, expansion ratio of k material, L1Is R1Segment diameter, BC base curve size, L of the target produced lens2Is the total diameter of the PBT mould, b is the edge width, R2Is the edge radius;
step2, determine lens center thickness CT from lens back vertex power D:
CT＝0.13,0.00＞D＞-0.25
＝0.12,-0.50＞D＞-1.75
＝0.11,-2.00＞D＞-3.75
＝0.10,-4.00＞D＞-4.75
＝0.09,-5.00＞D＞-5.75
＝0.08,-6.00＞D＞-6.75
＝0.07,-7.00＞D＞-10.00；
step3, calculating the optical area radius of the PP mould:
R3＝[1000*(1-n)/Fao]/1.25,
wherein the anterior lens surface power Fao is (D-F0)/(1-CT/1000/n F0),
lens back surface diopter F0-1000 x (1-n)/(R)1*1.25),
n is the refractive index of the lens material;
calculating the non-optical radian radius of the PP die:
R4＝-0.1119R3 4+3.5433R3 3-42.032R3 2+221.51R3-430.55
calculating the diameter of the optical area of the PP die:
L3＝-0.0007D5-0.0136D4-0.0917D3-0.2403D2-0.0615D+6.9
the rise h is 2.7-3.1,
the radian c of the edge area is 6.67 to 6.77,
width L of edge region5＝0.3～0.5，
The total peripheral diameter of the PP die is equal to L2R is as defined above1、R2、R3、R4、L1、L2、L3、L5BC, b, CT, Fao, F0, h, c are all in millimeters.
2. A 50% water content contact lens molding tool wherein the power D is divided into six general intervals: a1: 0-1.00; a2: -1.00 to-2.00; a3: -2.00 to-4.00; a4: -4.00 to-6.00; a5: -6.00 to-8.00; a6: -8.00 to-10.00,
designing a unified PBT mold, wherein the PBT mold is set: r1The radian of the segment is 6.7-7.1mm, the diameter is 10.0-10.5mm, R2The radian of the segment is 7.1-7.5mm, the peripheral diameter is 11.40-11.80mm,
determining each size data interval of the PP mould according to the focal power range interval:
。
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| JPS50151966A (en) * | 1974-05-06 | 1975-12-06 | ||
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| CN101564876A (en) * | 2009-06-01 | 2009-10-28 | 海昌隐形眼镜有限公司 | 55 percent contact lens composite mould and manufacturing method thereof |
| CN107031080A (en) * | 2009-10-16 | 2017-08-11 | 诺华股份有限公司 | Method for manufacturing eye lens |
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| WO2011162958A2 (en) * | 2010-06-22 | 2011-12-29 | Coopervision International Holding Company, Lp | Methods, devices, and systems for injection molding contact lenses |
| CN107107497A (en) * | 2014-12-19 | 2017-08-29 | 库柏维景国际控股公司 | The method and apparatus of the contact lenses demoulding |
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