A Publication on World Pulp, Paper & Allied Industry

April-June'2001 - Vol. 5 Issue 3

Tech Watch

  Continued......

PAGE 2 OF 5

Physical Strength Properties of Standard test sheets made from bagasse and their Blends with Bamboo pulp
by Sushma Mahajan*, O. P Bhatt** and Rajiv Pandey***


For each level of freeness, separate beating was done by taking 360 g. (o.d) virgin pulp sample. The pulp was soaked in water overnight. After loading in the beater, the pulp was dispersed for 15 minutes and there after standard pressure was given on the bed plate. Beating time and energy consumption to beat the pulp to a required level of beating was recorded. In case of unbeaten pulp, the pulp was only dispersed in valley beater for 15 minutes.

For preparation of blend of bagasse and bamboo pulps in the ratio of 80:20 both the pulps were beaten to 400 ml. (CSF) separately and then mixed. The mixture was thoroughly blended using laboratory disintegrator. The freeness of the blend was about 400 ml (CSF).

Table 2 : Results of Evaluation of Standard Test Sheets prepared from Bagasse Pulp at 3.5 kg/cm2
Freeness ml (CSF) Apparent Density
g/cm3
Tear Index
mNm2/g
Tensile Index
N.m/g
Burst Index
KPam2/g
600 0.75 5.31 33.25 1.88
450 0.86 5.93 45.84 2.59
300 0.88 5.63 47.23 2.76
150 0.93 5.50 48.20 3.07
 


Preparation and Wet pressing of standard test sheets

Standard test sheets of bagasse pulp of 60 gsm were prepared on British sheet making machine. After couching, the sheets were pressed in a hydraulic press for standard periods i.e., 5 minutes and 2 minutes at different intensities of pressure. During pressing, in place of mirror polished stainless steel plates, circular sunmica plates of same diameter and 0.65 mm. thickness were used. Each sheet was placed on two standard blotters and was covered by a sunmica plate. Nine standard test sheets were arranged on a metallic plate and were covered with another metallic plate. The metallic plate was of the same size as the press plate.

At a time nine test sheets from four different freeness level i.e., unbeaten, lightly beaten, well beaten and over beaten pulps, were placed on separate plates as described above and pressed for a particular intensity of pressure. The first and second pressing were carried out as described in standard procedure. The same arrangement was repeated for all intensity of pressure.

After pressing, two sheets were immediately removed for determination of moisture content. The remaining seven were dried in air using rings and plates. These sheets were used for evaluating the physical strength properties. The sheets were conditioned under standard conditions and evaluated for tear index, burst index and tensile index. Results are recorded in Table-1.

Table 3 : Results of Evaluation of Standard Test Sheets prepared from a blend of Bagasse and Bamboo Pulp (80:20) at 400ml (CSF)

Intensity of Pressure
Kg/cm2

Apparent Density
 gm/cm3

Tear Index 
mNm2/g

Tensile Index
Nm/g

Burst Index Kpam2/g Solid Content %
2.06 0.57 5.14 48.99 2.57 32.56
6.14 0.70 7.19 59.41 3.53 49.48
12.27 0.80 6.39 65.30 4.01 40.22
18.41 0.79 7.32 67.56 4.01 64.72
24.55 0.91 4.56 64.78 3.50 56.74
30.68 0.92 4.52 62.82 3.45 57.73
36.82 0.90 4.60 64.57 3.61 62.78
 
 
 
Table 4 : Results of Pulp Evaluation of Standard Test Sheets prepared from Bagasse Pulp, Bamboo Pulp and their blend (80:20) at 3.5 kg/cm2
S.No Properties Bagasse Bamboo Blend
1. Freeness ml CSF 250 250 400
2. Apparent Density
 gm/cm3
0.93 0.65 0.75
3. Tear Index 
mNm2/g
5.6 17.13 4.36
4. Tensile Index
Nm/g
47.5 77.12 55.75

5.

Burst Index Kpam2/g

2.85 5.50 2.95


Test sheets were also prepared for all the four levels of freeness and pressed at standard pressure of 3.5 kg/cm2. These sheets were also evaluated under standard conditions for tear index, burst index and tensile index. Results are recorded in Table-2. Test sheets were also prepared from the blend of bagasse and bamboo pulps (80:20) in a similar manner as in case of pure bagasse pulp. The sheets obtained were wet pressed under different intensities of pressure, air dried, conditioned and evaluated for physical strength properties. Results are recorded in Table-3.

Standard test sheets were also prepared from bagasse and bamboo pulps beaten to 250 ml CSF freeness and also from blend of bagasse and bamboo(80:20).They were pressed at standard pressure of 3.5 kg/cm2.These sheets were also air dried and evaluated under standard conditions for physical strength properties. Results are recorded in Table-4.

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