Novel technique for dewatering and rinsing medical dressing by one-bath method

Abstract

The invention discloses a new bath bleaching technique for medical dressing, which comprises two steps, namely prewashing and bleaching, wherein the prewashing step is as follows: adding 0.5 to 1 weight percent of cleaning bleacher and 0.1 to 0.5 weight percent of refining agent of the dressing, prewashing the dressing from 10 to 40 minutes in a reaction kettle at a temperature range of between 30 and 90 DEG C, discharging liquid, then pressurizing and rinsing or rinsing the dressing by liquid flow in the reaction kettle for 10 to 25 minutes, and discharging liquid; and after prewashing the dressing, adding bleacher containing sodium hydroxide and oxydol in the reaction kettle, and bleaching the dressing. The technique effectively solves the problems that the prior bleaching technique consumes much time and much energy and produces much sewage, the product becomes yellow and crisp easily, and the like. By adopting the technique, the total cost reduces greatly; and the technique has favorable economic benefit and social benefit.

Description

technical field [0001] The invention relates to the technical field of degreasing and bleaching of fabrics and fibers, in particular to a new one-bath debleaching process for medical dressings with high production efficiency, low energy consumption and less pollution discharge. Background technique [0002] The principle of the traditional de-bleaching process of cellulose fibers in the medical dressing industry is to first remove the lipid-like water-repellent substances on the surface of natural cotton fibers with sodium hydroxide, so that the cellulose fibers can reach the water absorption standard of medical cellulose fibers (settling within ≤10 seconds) speed), followed by oxidizing substances (H 2 o 2 , NaClO) to remove the pigment, so that the whiteness of the cotton cellulose fiber can meet the whiteness requirements of the medical pharmacopoeia (≥80Pate). The traditional process takes a long time to process. It needs to be degreased by high-temperature and high-al...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of the existing de-bleaching process, such as long time consumption, high energy consumption, high sewage and easy yellowing and brittleness of the pro