Nghiên cứu tác dụng dung dịch ẩm không sử dụng cồn Isopropyl alcohol trong công nghệ in Offset

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Tác giả: Trung Hải Huỳnh, Anh Tuân Phùng

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Môi trường, 2024

Mô tả vật lý: tr.18-21

Bộ sưu tập: Báo, Tạp chí

ID: 405406

Thêm vào giỏ Liên kết toàn văn

Công nghệ in offset sử dụng dung dịch ẩm để làm sạch các phần tử không in trên bản in offset, ngăn phần tử không in nhận mực. Dung dịch ẩm thông thường sử dụng 10 - 15% cồn Isopropyl alcohol (IPA) như một chất phụ gia hoạt động bề mặt tăng khả năng thấm ướt và tăng thời gian khô của mực in. Tuy nhiên, cồn IPA là một chất hữu cơ bay hơi (ở 25ºC, phơi bão hòa = 40 mmHg) gây ô nhiễm môi trường lao động và có thể gây cháy. Vì vậy, việc giảm sử dụng cồn IPA trong công nghệ in offset là rất cần thiết. Bài báo trình bày kết quả nghiên cứu ảnh hưởng của dung dịch ẩm không sử dụng cồn IPA, thay thế bằng ethylene glycol monobutyl ether (EGBE), đến thời gian khô của mực in offset. Kết quả nghiên cứu chỉ ra rằng, EGBE hoàn toàn có thể thay thế cồn IPA trong dung dịch ẩm và nồng độ hợp chất ethylene glycol phù hợp là 10% khối lượng, mực in khô hoàn toàn trong thời gian 420 - 660 phút tương đương với thời gian khô của dung dịch ẩm sử dụng cồn IPA.The offset printing technology utilizes fountain solution to maintain the cleanliness of non-image areas on the offset printing plate, preventing them from receiving offset ink. Typically, the fountain solution incorporates Isopropyl alcohol of a concentration of 10 - 15% by weight as surfactant agent to enhance the wetting ability and shorten drying time of the offset ink. However, Isopropyl alcohol (IPA) is a volatile organic compound with a vapor pressure of 40 mmHg at 25oC, posing harm to the working environment and being flammable. Therefore, reducing the use of IPA in offset printing technology is imperative. This paper presents the results of research on the effects of fountain solution-free IPA on the drying time of offset printing inks. The findings indicate that the ethylene glycol derivative can effectively substitute IPA in the fountain solution, with preferring concentration of 10% by weight. The drying time of the offset printing inks ranges from 420 to 660 minutes, similar to their drying time when using fountain solution with IPA.

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