What do you do when using printing thickener meet problems?
Printing thickener is the most commonly used thickener in the printing industry. In printing, will use two main materials glue and paste. And because under high shear force, will reduce the consistency, so need to use thickener to increase the printing materials consistency. Thickeners in use process may encounter various problems, following analysis problems and troubleshooting.
The color paste prepared by synthetic thickener have a good permeability advantage, in general, choose with the appropriate PV1 value thickener, itself no particles, through filtered, no other debris exists, and through well dispersed,won’t happen blocking phenomenon, the main problem is to prevent adhesive or color coating combined generate gel phenomenon.
2.The impact of water quality
The amount of synthetic thickener have a great relationship with water quality, most of manufacturers use demineralized water or well water beating. In general well water have high salt content, thickener dosage is also larger, but use demineralized water, the amount is relatively small, different regions, water quality is different. In addition,climatic conditions changes, also caused water quality fluctuations, therefore, need according to the local water quality conditions, to determine the amount.
3.Paint black and paint white problem
Any anionic synthetic thickener, when used with paint black or paint white, often become thickening,even occurs gel, thickening or gel happened degree have a great relationship with paint type and amount, encountered this situation, general choose add ammonia, or use semi-emulsion paste to solve.
4.After compatibility with adhesives and coatings viscosity have changed.
When use preparation synthetic thickener stock paste method modulation color paste, the viscosity and coating adding often lead to the original paste viscosity or liquidity changes, a small number of adhesives and coatings will become thicker, while the majority will become thinner, causing such changes is mainly due to the electrolytes and surfactants impact (for the case does not occur gel).
5.The hand feeling and vividness effect
In general, use water-based synthetic thickener printed pattern, its hand feel freshness slightly bad than use A pulp printing , which may related to after filmed in thickener active ingredients remaining in the fabric surface ,this is a common problem. For some requirements are relatively high processes, can add softeners,to improve the hand feel, or use semi-emulsified paste to enhance vividness.
6.Impact on color fastness
In terms of pigment printing paste, thickener function is thickening color paste,however printing fastness is mainly depends on the used binder nature and compatibility with other additives, use water-based thickener will not affect color fastness printing, generally speaking, a small amount of thickener exist, it’ll benefit to improve the final color fastness.