Contact lenses plastics mould used for semi-lathe production and manufacturing method thereof

A technology for contact lenses and plastic molds, which is applied to household appliances, other household appliances, applications, etc., can solve the problem of easy separation of polymer blanks from male molds and internal stress of contact lenses, and achieve the effect of uncomplicated preparation process.

Active Publication Date: 2008-07-30
GUANGZHOU BAOSHINING OPTICAL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to overcome and improve the problems that the polymer blank is easily separated from the male mold and the internal stress of the contact lens in the

Method used

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  • Contact lenses plastics mould used for semi-lathe production and manufacturing method thereof
  • Contact lenses plastics mould used for semi-lathe production and manufacturing method thereof

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Effect test

Embodiment 1

[0029] The preparation method of the contact lens plastic mold that is used for semi-turning method production comprises following steps and technological condition:

[0030] (1) Preparation of the male mold core: electroplate metal nickel on the carbon steel, and obtain a contact lens male mold core (core) with 2 arcs and multi-curved surfaces after precision machining. Specifically, the electroplating thickness is about 0.3mm on a carbon steel blank with a reserved radius (R)=8, sagittal height (h)=3mm concave surface, outer diameter (ф)=12.5mm, length (L)=20mm The metal nickel is then placed on a precision CNC lathe (such as the OPTOFORM 80A of Sterling Ultra Precision Inc.) to turn a metal mold core with 4 arc-curved surfaces. The curved surface formed by the first arc corresponds to the inner optical zone of the lens, and the positions of the second to fourth arcs are the transition zone between the optical zone and the edge, with a width of 0.55mm. The schematic diagram...

Embodiment 2

[0052] (1) Preparation of the male mold core: electroplate metal nickel on the carbon steel, and obtain a contact lens male mold core (core) with 2 arcs and multi-curved surfaces after precision machining. Specifically, the electroplating thickness is about 0.3mm on a carbon steel blank with a reserved radius (R)=8, sagittal height (h)=3mm concave surface, outer diameter (ф)=12.5mm, length (L)=20mm The metal nickel is then placed on a precision CNC lathe (such as the OPTOFORM 80A of Sterling Ultra Precision Inc.) to turn a metal mold core with 4 arc-curved surfaces. The curved surface formed by the first arc corresponds to the inner optical zone of the lens, and the positions of the second to fourth arcs are the transition zone between the optical zone and the edge, with a width of 0.55mm. The schematic diagram of the appearance of the metal mold core is shown in Figure 1a and Figure 1b, which are the arc segment R1 with a radius of 7.260mm, the arc segment R2 with a radius of...

Embodiment 3

[0074] (1) Preparation of the male mold core: electroplate metal nickel on the carbon steel, and obtain a contact lens male mold core (core) with 2 arcs and multi-curved surfaces after precision machining. Specifically, metal nickel with a thickness of about 0.3mm is electroplated on a carbon steel blank with a reserved radius R=8, sagittal height h=3mm concave surface, outer diameter ф=12.5mm, and length L=20mm, and then placed On a precision CNC lathe (OPTOFORM 80A of Sterling Ultra Precision Inc.), a metal mold core with 4 arc-curved surfaces was turned. The curved surface formed by the first arc corresponds to the inner optical zone of the lens, and the positions of the second to fourth arcs are the transition zone between the optical zone and the edge, with a width of 0.55mm. The schematic diagram of the appearance of the metal mold core is shown in Figure 1a and Figure 1b, which are the arc segment R1 with a radius of 7.260mm, the arc segment R2 with a radius of 7.433mm,...

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Abstract

The invention discloses a plastic mould for contact lens manufactured by a half turning method and a preparation method thereof. The method comprises five processes: a male die metal die kernel, an injection die preparation, a feed preparation, an extrusion palletizing, a male die injection and a female die injection. The feed preparation is counted by the mass portion. 70 portions of PBT and 30 portions of PC are mixed and then are placed in a baking oven and are carried out a drying process at the temperature of 100-140 DEC C for more than 4 hours; 25-35 portions of coupling agent and 65-75 portions of inorganic additives are carried out a surface process and are manufactured into a filling master batch; the temperature of the male die injection is 170-245 DEG C, and the injection pressure is 700-1000bar and the holding time is 15-25sec. The manufactured male die has the advantages of hydrophilicity and a high surface energy. The manufactured female die has the advantages of a hydrophobicity and low surface energy. The invention, through a reasonable selection to the male and female die plastic, causes that the unqualified rate of separating the contact lens roughcast and the male die is not less than 2 percent and the deformation unqualified rate of the contact is less than 5 percent.

Description

technical field [0001] The invention relates to a mold for forming contact lenses, in particular to a plastic male-female mold used in the process of producing contact lenses by a semi-turning method and a preparation method thereof. Background technique [0002] There are usually four production methods for contact lenses: molding, centrifugal casting, full turning and half turning. The method of semi-turning to produce contact lenses has been described in detail in Chinese invention patent applications with application numbers 200410094834.x and 200510109538.7. Chinese utility model patent 200420077402.2 discloses a metal mold structure for plastic positive mold injection molding. But above-mentioned patent technology all does not mention to be used as the plastic female and male mold material of semi-turning method production contact lens. Chinese patent CN86 102021 A discloses the material used as the male and female molds in the production of contact lenses by molding ...

Claims

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Application Information

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IPC IPC(8): B29C33/38B29B13/06B29B9/06B29C45/76B29C47/60B29K105/06B29K67/00B29K69/00B29L11/00
Inventor 宋伟林冬青冯伟平
Owner GUANGZHOU BAOSHINING OPTICAL PROD
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