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Method for removing mold from plastic lens

A plastic lens, casting technology, applied in other household appliances, optical components, household appliances, etc., can solve the problems of mechanical deformation of plastic lenses

Active Publication Date: 2016-12-28
RODENSTOCK GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of this method of demolding is the mechanical deformation of the plastic lens due to the strike angle being pressed in

Method used

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  • Method for removing mold from plastic lens
  • Method for removing mold from plastic lens
  • Method for removing mold from plastic lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] figure 1 A schematic sectional view of the casting device 10 arranged in the demoulding device 2 is shown. The casting device 10 comprises a first casting mold 11 and a second casting mold 12 arranged at a distance from each other. Molding resin has been poured and hardened in the gap between the first mold 11 and the second mold 12 to form the plastic lens 13 . The casting device 10 is placed on the demoulding device 2 with the concave surface of the casting device 10 at the bottommost. Here, one end of the substantially circular or cylindrical casting device rests against the block 4 of the demolding device 2 . On the end of the casting device 10 opposite the block 4 the ram 3 of the demolding device 2 is arranged.

[0041] figure 2 Shown in enlarged, schematic cross-sectional view figure 1 A section showing the ram and the outside of the casting device facing the ram. The casting device 10 is configured in a substantially circularly symmetrical manner. Here, ...

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Abstract

The method involves producing a plastic lens (23) having a predetermined breaking point (25) by curing of a casting resin in a casting assembly (20). The predetermined breaking point of the plastic lens is terminated for releasing the casting molds (21,22) of the casting assembly from the plastic lens. An independent claim is included for casting assembly for producing plastic lens.

Description

technical field [0001] The invention relates to a method for removing a casting mold from a plastic lens, and to a casting device. Background technique [0002] In the production of plastic lenses, such as flexfocus lenses, plastic lenses are formed in casting devices by means of liquid or viscous plastic monomer mixtures (so-called casting resins) and are subsequently hardened by means of polymerization or stepwise addition polymerization reactions casting. The associated casting apparatus comprises two mold housings (so-called casting molds) to which the front and rear surfaces of the finished plastic lens are separately cast. The two casting molds can be sealed with strips so that the casting device can be filled and closed for subsequent hardening of the lens. Here, the edge of the plastic lens to be produced is flush with the edge of the mold. [0003] During the hardening process, the volume of the molding resin decreases, thereby creating mechanical stresses within...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/00B29C45/40B29L11/00
CPCB29D11/00221B29C39/36B29D11/00009B29D11/00192B29D11/00432
Inventor 赫尔穆特·劳赫
Owner RODENSTOCK GMBH