A STUDY OF SUITABILITY OF SCREEN PRINTING ON MEDICAL POLYURETHANE FOAM

• Main Authors: David Su, 蘇育才
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/23442098592862453255

碩士 === 世新大學 === 圖文傳播暨數位出版學研究所(含碩專班) === 95 === The printed manufacture of the medical apparatus belonged to one of a more special circle of a printing industry. For the cloth on the medical air cushion bed, the artificial cloth coating the Foaming Polyurethane. To research for the suitableness of applied to halftone printing. To find out a better printing suitableness matched with a safety standard and medical apparatus. According to three tests for the printed material as below: printing ink peeled off test, alcohol-resistant test and 95oC high-temperature ageing water-washes test, proceeded the following variables: to allocate the percentage of ink and assistant, to change the temperature and speed of dry an ink to find out a better way to fit for a mass product. 1. Peel off degree: According to an experiment, we found to control the following two conditions then we could get the best adhered ability and the shrinkage of cloth could be in the limitation tolerance. (a) To bake it and control the temperature between 50 oC ~ 60 oC. (b) To control the dry speed between 1 M/min ~ 1.5 M/min. 2. Alcohol-resistant: The data which was paired by intersected a baked temperature and speed can temporary dry the surface of printing ink in the experiment. (It will be slowly dried inside depended on the static placed time.) So the dry surface didn’t be destroyed when we wiped it with alcohol. Therefore it can be pass the Alcohol-resistant test. 3. High-temperature ageing water-washes: It was required that ink did not fall off after water-washes for 20 times at 95 oC. We knew we had to add a hardener into the printing ink in order to get the best adhered ability. The ratio was Ink : Slow-Dry Solvent : Hardener = 10 : 1 : 1 For the monochroic print, there was obviously variation after two days. So it could reach the request of the experiment. For the piles of color print, it would better control the printing time-gap of the fore and hind colors within 4 hours. And it was placed statically for more than 2 days after print. Therefore it could match with the request. To sum up all results as the above, we knew - to control the baked temperature between 50 oC and 60 oC - to control the baked speed between 1 M/min and 1.5 M/min - to add Hardener into Ink. Ratio: Ink : Solvent : Hardener = 10 : 1 : 1 - to control the printing time-gap of the fore and hind colors within 4 hours for the piles of color printing - to place statically for more than 2 days after print. then we can got the best adhered effect.