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1. WO2020240442 - PAD TRANSFER PRINTING INSTRUMENT AND METHOD FOR MAKING COLORED CONTACT LENSES

Publication Number WO/2020/240442
Publication Date 03.12.2020
International Application No. PCT/IB2020/055033
International Filing Date 27.05.2020
IPC
B41F 17/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
FPRINTING MACHINES OR PRESSES
17Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
B29D 11/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
11Producing optical elements, e.g. lenses or prisms
B41F 17/36 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
FPRINTING MACHINES OR PRESSES
17Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
36for printing on tablets, pills, or like small articles
G02C 7/04 2006.01
GPHYSICS
02OPTICS
CSPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
7Optical parts
02Lenses; Lens systems
04Contact lenses for the eyes
B41F 31/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
FPRINTING MACHINES OR PRESSES
31Inking arrangements or devices
B41F 31/24 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
FPRINTING MACHINES OR PRESSES
31Inking arrangements or devices
24Absorbent pads
Applicants
  • ALCON INC. [CH]/[CH]
Inventors
  • BREITKOPF, Richard Charles
  • YIN, Changhong
  • ZHANG, Steve Yun
Priority Data
62/853,24628.05.2019US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PAD TRANSFER PRINTING INSTRUMENT AND METHOD FOR MAKING COLORED CONTACT LENSES
(FR) INSTRUMENT D'IMPRESSION PAR TRANSFERT DE TAMPON ET PROCÉDÉ PERMETTANT DE FABRIQUER DES LENTILLES DE CONTACT COLORÉES
Abstract
(EN)
The invention relates to a pad printing instrument comprising an ink supply system capable of control the temperature, viscosity and colorant concentration of an ink in an ink cup. Such controls are achieved by continuously adding and mixing a cold ink having a composition identical to the ink in the ink cup but having a lower temperature. The continuous addition of a small amount of a cold ink into the ink cup could compensate heat generated by the friction between the ink cup and a cliché and could minimize the evaporation of a diluent in the ink and change in the concentration of colorants in the ink and ink viscosity. The invention also relates to use of a pad printing instrument comprising an ink supply system of the invention for producing colored hydrogel or silicone hydrogel contact lenses.
(FR)
L'invention concerne un instrument d'impression à tampon comprenant un système d'alimentation en encre susceptible de réguler la température, la viscosité et la concentration en colorant d'une encre dans une coupelle d'encre. De telles régulations sont obtenues par ajout et mélange en continu d'une encre froide ayant une composition identique à l'encre dans la coupelle d'encre mais ayant une température inférieure. L'ajout continu d'une petite quantité d'encre froide dans la coupelle d'encre pourrait compenser la chaleur générée par le frottement entre la coupelle d'encre et un cliché et pourrait réduire au minimum l'évaporation d'un diluant dans l'encre et changer la concentration de colorants dans l'encre et la viscosité de l'encre. L'invention concerne également l'utilisation d'un instrument d'impression à tampon comprenant un système d'alimentation en encre selon l'invention pour produire des lentilles de contact colorées en hydrogel ou en hydrogel de silicone.
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