What is Talc
Talc is well-known as talcum powder. It is a natural hydrated magnesium silicate – H
Advantages of Talc
- The uses of talc as a paper filler is suitable for rotogravure printing process. Two things are very important for rotogravure paper; paper smoothness and good spool formation. As talc is a flat-like particle, it helps improve the paper smoothness. The low coefficient of friction of talc helps to produce a large spool with constant tension.
- Talc is an organophilic, so absorbs impurities from the process, such as pitch, resin particles. Hence talc is used as a cleaner of the wet-end system of the paper machine. Talc also prevents agglomeration. Therefore improve paper machine runnability.
- Low cost hence it is economical.
- Good retention
- Less wire abrasion hence extends life time of the wire cloth in paper machine compare with the GCC and PCC.
- Improve dewatering.
- Lower effect on the paper strength compare with other fillers.
- As talc is organophilic it is helps to reduce dye consumption and two-sidedness in colored paper.
Disadvantages of Talc
- Higher dusting tendency during printing and in dryer section during paper production.
- Talc is a hydrophobic, hence it is difficult to preparation water-based dispersion.
- As talc is an organophilic, hence it is not suitable for offset printing. Because in offset printing process image transfer by using a hydrophilic/hydrophobic action.