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Colorant presentation for pad printing

A technology of colorants and pad printing heads, which can be used in printing, printing machines, rotary printing machines, etc., and can solve problems such as changes in the viscosity of colorants

Inactive Publication Date: 2007-04-25
JOHNSON & JOHNSON VISION CARE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, the colorant viscosity may change based on changes in the ambient temperature surrounding the colorant container

Method used

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  • Colorant presentation for pad printing
  • Colorant presentation for pad printing
  • Colorant presentation for pad printing

Examples

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Embodiment Construction

[0013] overview

[0014] The present invention focuses on systems and methods for providing colorants, such as ink solutions, onto print cups and printing cliches for use in conjunction with pad printing. According to the present invention, a self-contained cart includes a colorant supply, an inline viscometer, a solvent supply, an automatic solvent dispenser, and a mixer for mixing solvent and colorant. The cart can be transported to the printing position on castors so that the supply and return lines can be quickly connected to the printing position, wherein the printing operation does not need to be interrupted in order to replenish the ink supply. The built-in viscometer and solution dispenser automatically maintain the colorant at the desired viscosity.

[0015] In some preferred embodiments of the present invention there is provided a method of circulating colorant in a pad printing system comprising a sealed colorant cup 8 adjacent to a cliche 9 containing colorant th...

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PUM

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Abstract

The present invention provides systems and methods for providing colorant to a colorant cup apparatus that is adjacent to a pad printing cliche. The fluid colorant is fed from a colorant container through a feed conduit to the cup and an inline viscometer external to the colorant container measures the viscosity of colorant within the feed conduit. A control mechanism can dispense colorant solvent into the colorant container based upon a viscosity measurement performed by the inline viscometer. The disclosed systems, colorant cups and methods are useful in the preparation of tinted contact lenses.

Description

technical field [0001] The present invention relates to an apparatus for controlling the application of colorant to a pad printing head. In particular, the present invention provides an apparatus and method for controlling the viscosity and flow of colorant used in a pad printing system. Background technique [0002] Methods and systems of pad printing are well known in the industry. Typically, the colorant is provided to a pad printing head that has been pre-formed into the desired pattern or shape. The pad print head pad prints on the specified item using the colorants that have been supplied to it. The process is highly repeatable and additional colorants can be supplied to the pad printing head and make additional prints on the item. [0003] In one particular application, colorants and pad printing are used to make colored contact lenses. In some methods of making colored contact lenses, the colorant is applied to raw lens material by transferring the colorant from t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41F31/02B41F33/10G02C7/04
CPCB41F17/001G05D24/02
Inventor M·F·维德曼J·瑞安A·弗勒明P·M·鲍威尔
Owner JOHNSON & JOHNSON VISION CARE INC
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