High-temperature cooking bags of printing process

Using polyurethane ink to printing, such as cooking temperature over 121 ℃, should add a certain proportion of curing agent, adding ink temperature tolerance. Commonly used in cooking have yip's ink GXP, DIC ink optimal force f, Oriental IAMLSTAR type of ink, etc. Cooking with a butanone background ink solvent soluble resin. First, due to the volatilization of butanone faster than toluene, therefore, when using polyurethane ink, in order to prevent really bad too volatile and the solubility of the solvent, ink metastatic phenomenon such as bad, need to ensure that the amount of solvent composition of butanone account for certain proportion. Second, there are two liquid reactive polyurethane ink. When the production of high temperature cooking bags, need to pass above 121 ℃ high temperature sterilization, must use the pu ink, and want to join the right amount of curing agent, stirring evenly rear can print. Two liquid reactive ink using residual filter, part to join the new ink or used as a solvent. When residual ink agglomerate or severe swells phenomenon occurs shall not continue to use. Third, polyurethane ink composite performance is good, have very high peel strength. The peel strength of polyurethane ink can reach 3 - 8 n / 15 mm, and cooking ink after 121 ℃ high temperature sterilization, peel strength increase. In the summer, use high temperature resistant compound ink printing NY film or PET, anti sticking phenomenon may arise, especially the south of the high humidity. Due to NY membrane hygroscopicity strong, when the relative humidity of 80% or more, it's easy to have a quality failure, the need to control the workshop environment, otherwise, they don't produce high boiling resistance composite bags.