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Thin film in-line degasser

A degasser and appliance technology, applied in the direction of liquid degassing, rapid degassing, chemical instruments and methods, etc., can solve problems such as discarding, achieve easy cleaning, improve flexibility, and eliminate difficulties

Inactive Publication Date: 2007-02-28
JOHNSON & JOHNSON VISION CARE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degassing operation using permeable tubes has its own disadvantages: due to the special circumstances involved in pumping viscous liquid monomer through the tubes, it usually requires a batch operation; therefore, the monomer is stored in the container, so the monomer needs to be transported to the tubular degassing station outside the production line
In the aforementioned industrial manufacturing facilities, these residual quantities must be discarded after each expiry of their expiry date

Method used

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  • Thin film in-line degasser
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Examples

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Embodiment Construction

[0022] The invention has particular utility in degassing liquid monomers used in the manufacture of ophthalmic lenses. Examples of ophthalmic lenses in this regard include, but are not limited to, hard, soft, hard gas-permeable contact lenses and intraocular lenses and lenses for eyeglasses. The present invention has particular utility in soft contact lenses generally classified as hydrogel lenses; Liquid monomers prepared from acrylates, and acid esters are of particular utility. In this specification, the term "liquid monomer" includes the above-mentioned monomers and mixtures thereof, including any or all of the above-mentioned mixtures with other additives known in the art such as cross-linking agents and reinforcing agents. Gases that are generally dissolved in the liquid monomer and that are desired to be removed (outgassed) include oxygen and may include nitrogen and other gases. Soft lenses in this regard are typically prepared by free radical polymerization of a mon...

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Abstract

The invention is a stackable packing element for use in degassing liquid ophthalmic lens monomer, and to a modular degasser (60) and process, including an in-line degassing process, employing same. The stackable packing element is comprised of a body module (10) and a removable puck component (20).

Description

technical field [0001] The present invention relates to degassing liquid monomers used in the manufacture of ophthalmic lenses, such as soft contact lenses. In particular, the invention relates to packing elements for degassers. The packing elements are modular and are adapted to be stacked with such other modules. The present invention increases flexibility for variation in degassing operations by allowing easy addition, removal, or replacement of such packing elements as may be required under any given situation. Furthermore, the packing element of the present invention can be easily cleaned, which cleaning operation is further facilitated by the fact that the packing element is constructed of removable parts. The present invention also allows for in-line degassing of the liquid monomer, which increases the efficiency of the production line for ophthalmic lenses and mitigates the environmental concerns associated with conventionally used batch degassing methods. Backgrou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/00B29C39/02B29C39/22B29C39/24B29C39/26B29D11/00B29L11/00
CPCB01D19/0036B01D19/0047B01D19/00
Inventor K·A·杨S·C·佩格拉姆K·T·桑德斯
Owner JOHNSON & JOHNSON VISION CARE INC
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