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Method and apparatus for dispensing flowable material into a mold

A technology of distributing device and mold, applied in the direction of household appliances, other household appliances, applications, etc., can solve the problems of defective glasses and affecting the accuracy rate, etc.

Inactive Publication Date: 2016-01-20
ALCON INC
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Especially in the production of silicone hydrogel glasses, a further possible defect is that residues of small amounts of starting material can remain on the dosing nozzle and can negatively affect the precision of the amount of starting material dispensed into the mould. rate, with the possible result that the glasses are defective and have to be discarded

Method used

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  • Method and apparatus for dispensing flowable material into a mold
  • Method and apparatus for dispensing flowable material into a mold

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Embodiment Construction

[0030] Attached below figure 1 explain the invention, figure 1 It is a schematic diagram of the structure of the outer cover 1, the entrance door 2 and the exit door 3. The inlet door 2 and the outlet door 3 form boundaries 21 and 31 in the form of "walls" generated by various fluids. Such as figure 1 As shown, during operation a mixture of an inert gas (eg nitrogen) and a solvent (eg propanol) is continuously delivered through the upper wall of the enclosure 1 into the interior 10 of the enclosure 1 with the aid of suitable supply means 100 . further as figure 1As shown, the interior 20 of the inlet valve 2 is sucked through the upper wall of the inlet valve 2 under the action of a suitable suction device 200 , such as a suction pump. As a result, clean air (filtered, eg through a filter) and a gas / solvent mixture are introduced into the interior 20 of the inlet valve 2 by suctioning the interior 20 of the inlet valve 2 . Two fluids (inert gas / solvent mixture and clean a...

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Abstract

The present invention relates to a method of dispensing a flowable material comprising a volatile solvent, in particular a material for forming lenses, for example a material for forming contact lenses, into a mold. The method comprises the steps of: providing a mould; providing dispensing means (40, 41, 42); arranging the mold below the dispensing means (40, 41, 42); dispensing a flowable material comprising a volatile solvent into the mould, the The dispensing step is performed in a localized atmosphere that substantially prevents solvent evaporation from the flowable material.

Description

technical field [0001] The present invention relates to a method and apparatus for dispensing a flowable material into a mould. More particularly, the present invention relates to a method and apparatus for dispensing flowable materials containing volatile solvents, particularly materials used to form lenses, such as contact lenses, into molds. Background technique [0002] Today, large-scale manufacturing of contact lenses, such as contact lenses that are worn and then disposed of, and especially disposable contact lenses, is carried out by highly automated manufacturing processes. Typically, in such processes, a predetermined amount of starting material is dispensed into a female mold, for example with the aid of a feed nozzle. Next, the female mold is closed with the aid of the corresponding male mold, and the material contained in the mold is then polymerized and / or crosslinked to form the contact lens. Depending on the starting material used, an appropriate amount of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C39/42B29D11/00
CPCB29C39/24B29C39/42B29D11/00125
Inventor M·布洛恩A·海因里希P·海格曼
Owner ALCON INC
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