How to solve common problems in printing materials
Key tips: common problems of printing materials and solutions
Several common problems and solutions in printing process production
1: color migration color variety is added to the glue to color, part of the color will appear color migration, dark color migration to light color flower bit or colored printing to white color bit, or printing color run to the unprinted fabric called color migration.In order to avoid color migration in the production process, it is necessary to test the resistance of color variety.
Test method: color species (3%) + transparent paste (97%) - printing - flash drying - cover white mucilage (100%) - since the dry - 130 ℃ x 3 seconds press.The transfer phenomenon can be seen with the inner eye in grade 5. It is not recommended to use it for glue printing. For water paste (paint printing) printing, white or light color cloth should be paid attention to.Most fluorescent colors do not transfer the glue, so we should communicate clearly with the customer before production.
2: the majority of thermal treatment chameleon printing requires heat treatment. Some of the color varieties have poor thermal performance, and serious color difference will appear after finishing treatment, especially when printing is mixed with thermal ink thick plate.So necessary for color kind of heat resistant test. The test method is: 37% white mucilage + 60% + 3% transparent pulp kinds of natural drying at 180 ℃ after heat treatment for 30 seconds, the highest level 5, the naked eye can't distinguish between a category 5 before and after heat treatment
3: light fastness test at present, many companies are taking brand company orders or European and American orders, and have strict requirements on light fastness. If the customer has such requirements, he/she can ask the supplier to provide the light fastness data or the tripartite test report of the pigment, or he/she can print the printed sample to the tripartite test institute.The general test method and standard is: JIS l-0842 carbon arc lamp exposure 20 hours
4: solvent resistance test currently more and more garments are used for dry cleaning. If the pigment has poor solvent resistance, the clothes will fade and change color after dry cleaning, causing dissatisfaction and complaints from consumers.Therefore, the garment company will sample and send the goods for inspection before receiving them.If the customer has this requirement, he/she can ask the supplier to provide the light-resistant data or the third-party test report of the pigment, or he/she can print the printed sample to the third-party testing organization for testing.Test method: JISL - 0860 (tetrachloroethylene, 40 ℃ for 30 seconds)
5: the test of resistance to drawing shall be carried out before the printing of color. Some pigments are not resistant to reducing agents. If the paint overheats, it will become two colors completely, for the sake of unnecessary loss.Therefore, it is very necessary to test the resistance of color samples before opening the goods.Test method: add 5% of rongalite atmospheric 105 ℃ steam for 8 minutes, or 170 ℃ hot baked for 3 minutes.
Other considerations: such as environmental protection properties, aromatic amine, formaldehyde, heavy metals, APEO (alkylphenol polyvinyl chloride ether). There is also reaction with the slurry, some pigments will react with the slurry, stirring thickens, thins and gels.Dry and wet friction, etc.
6: glue washing water falls off and cracks
The same cloth, the same glue, the same glue, the same glue.Water-resistant properties and elasticity are different.Therefore, the washing performance of the glue shall be tested before delivery, and the standard test (national standard, American standard and European standard) shall be conducted according to the requirements of the customer. The washing machine and test method of national standard shall be adopted.Some customers have no problem with the home washing machine, and do not pass the third-party testing.Still have client with hand wash, when testing OK open goods when not good.The same person different environment, mood and strength are different.Therefore, to do any test needs standards, different standards, different testing methods, test results are different.
7: elastic test
At present, there are many kinds of textiles, different ingredients, different weaving methods, elastic will be different.A slurry are unlikely to meet all the elasticity of fabric, so has been with the open of mucilage, applied in different elasticity of fabric should be resilient to test of mucilage, some customers plate after good with his hands to pull mucilage not crack, and then open the goods, such as printed the big goods, after heat treatment, finish wash test found that after the printing surface water wash water cracked.Some mucilage after heat treatment and washing elasticity and feel there will be changes, so the final even after heat treatment and water to wash it is elastic and feel is later. The printing surface elasticity can be transparent paste with white mucilage than crack to adjust, increase the proportion of transparency pulp or backing with transparent pulp, or increase the number of printing can increase the elasticity of printing.