Application of Hydroxypropyl Methyl Cellulose in Ink Printing

Application of Hydroxypropyl Methyl Cellulose in Ink Printing

The ink is composed of pigments, binders and auxiliary agents (hydroxypropyl methylcellulose), which are mixed and rolled

Ready to ink. Color, body (usually the rheological properties of ink such as thin consistency and fluidity are called the body of ink) and drying performance are the three most important properties of ink.

Instant hydroxypropyl methylcellulose for ink printing is an odorless, tasteless, nontoxic white powder.

It swells into a clear or slightly cloudy colloidal solution in cold water. It has the characteristics of thickening, bonding, dispersing, emulsification, film-forming, suspension, adsorption, gelation, surface activity, water retention and protective colloid. plays an important role in.

1

Hydroxypropyl methylcellulose has three viscosities of 100,000, 150,000, and 200,000. The viscosity is the characteristic of ink fluid flow.

An indicator of the amount of resistance (or internal friction) to motion. In the process of offset printing, a certain viscosity is necessary to keep the ink transfer normally.

It is the main condition for delivery and transfer, and it is also an important condition for determining the fastness, clarity and gloss of imprinting. Ink viscosity

If it is too large, it will be difficult to transfer and transfer, so that the amount of ink on the layout will be insufficient, resulting in the nakedness of the graphics and text to form a pattern. Likewise, viscosity

If it is too large, it is also easy to cause the paper to be fluffed and powdered, or to cause the peeling of the printed sheet. But if the viscosity is too small, it is easy to produce

Floating and dirty, it will cause ink emulsification in severe cases, if it cannot maintain normal transmission and transfer, and gradually in the ink

Pigment particles accumulate on rollers, printing plates and blankets, and when the accumulation reaches a certain level, it will cause smudging.

2

Hydroxypropyl methyl cellulose has good adhesion, avoiding the adhesion of ink during the printing process

It does not match the performance and printing conditions of the substrate, resulting in paper powder, lint, poor ink overprinting, printing

Printing failures such as dirty plates.

3

Hydroxypropyl methylcellulose has good thixotropy, avoiding the thixotropy of the ink during the printing process

Printing failures such as “poor ink flow”, uneven ink transfer, and serious expansion of dots caused by the bad.

4

Hydroxypropyl methylcellulose has extremely high adhesion, in the process of offset printing, the tinting strength of the ink is not only direct

It is related to the printing effect and the quality of the printed product, and it is also very closely related to the amount of ink per unit area. If you choose

Using inks with strong tinting strength will consume less ink than inks with weak tinting strength, and good printing results can be obtained.

5

Hydroxypropyl methylcellulose has excellent fluidity, ideal fluidity ink, and leveling in the ink fountain

It has good inking ability and good inking ability; the transfer and transfer between ink rollers or between printing plate and blanket is also good;

The ink layer is uniform; the imprinted ink film is flat and smooth. If the fluidity is too small, it is easy to cause poor ink discharge; uneven distribution of the ink layer, etc.

phenomenon, the surface of the imprinted ink film will also appear ripples. When the fluidity is too large, the thin ink layer is easy to cause dot expansion, printing

The color is not strong. The flow meter method is commonly used.