Preparation of Modified Kaolin Filler with Cesium and Its Application in Security Paper

Table 1

Mechanical and optical properties of wood paper handsheets loaded with native kaolin and Cs-kaolin.

		Mechanical properties			Optical properties
Wood paper handsheets		Burst index	Tensile index	Tear index	Brightness	Opacity
	Filler %	Kpa·m^2/g	N·m/g	mN·m^2/g	%	%
Kaolin	0	4.88	46.20	10.25	77.10	76.70
	5	4.19	40.82	9.57	80.50	76.90
	8	4.04	36.44	9.79	81.70	77.10
	12	3.84	32.28	9.43	82.30	78.00
	15	3.57	30.22	8.73	83.30	79.08
Cs-kaolin	0	4.88	46.20	10.25	77.10	76.70
	5	4.32	41.73	10.17	81.60	77.50
	8	4.14	37.28	10.16	82.66	78.00
	12	4.02	35.29	9.71	84.50	78.50
	15	3.70	32.25	9.30	85.60	79.80