Preparation method for obtaining uniformly separated eucalyptus paper pulp fiber
A technology of pulp fiber and eucalyptus, applied in the field of preparation of evenly separated eucalyptus pulp fibers, to achieve the effects of low damage, reduced fiber bundle content, and small pulp residue
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Embodiment １
[0027](1) The eucalyptus wood raw material is manually or mechanically peeled and chipped to become wood chips, the wood chips are higher than 85%, and sent to a negative pressure mixing bin with a temperature of 55°C and a pressure of 12kpa for 15 minutes of decompression and exhaust, and mixing The silo is equipped with an ultrasonic auxiliary device to accelerate the penetration and mixing of the cooking liquid into the wood chips, and the insulation material is laid outside the mixing silo to ensure that the temperature drop during the cooking liquid soaking the wood chips does not exceed 8°C, and the built-in ultrasonic device is activated Ultrasound for 3 minutes to continuously decompress and exhaust, so that the wood chips are in a negative pressure state; then under negative pressure, an excessive amount of cooking agent composed of the following components is added and maintained for 40 minutes: NaOH concentration 3.5%, sodium sulfide concentration 1%, anthraquinone co...
Embodiment 2
[0030] (1) The eucalyptus wood raw material is manually or mechanically peeled and chipped to become wood chips, and sent to a negative pressure mixing bin with a temperature of 50°C and a pressure of 5kpa, and decompresses and exhausts for 5 minutes, so that the wood chips are in a negative pressure state , the ultrasonic auxiliary device is not activated in the mixing bin; since the dryness of the wood chips is lower than 85%, dry hot air with a temperature not higher than 60°C is sent in during the negative pressure exhaust process before adding the cooking agent, and the wood chips are heated while Naturally discharge the moisture, preheat the wood chips to 50°C; then add an excessive amount of cooking agent composed of the following components under negative pressure and keep it for 60 minutes: NaOH concentration 4.5%, sodium sulfide concentration 1.5%, anthraquinone concentration 0.01%, The concentration of conventional anionic surfactants is 0.02%, and the rest is water;...
Embodiment 3
[0033] Same as steps (1) and (2) of Example 1, add step (3):
[0034] (3) Send the good pulp from step (2) into the oxygen delignification tower, with pulp concentration of 10%, initial oxygen pressure of 0.6MPa, alkali consumption of 1.5%, Mg 2 SO 4 Under the conditions of 0.5% dosage and temperature of 100°C, carry out oxygen desizing for 45 minutes, and then wash according to the cleanliness requirements of the specification, and the washing wastewater is used as the reuse water for pulp washing after cooking in step (2), to obtain eucalyptus oxygen desizing. Oxygen desizing results of this step: Oxygen delignification pulp loss rate 3.2%, kappa number 9, brightness 51%ISO, viscosity 1120 mL / g, paper-forming fibrous dust ≥ 1mm 2 Less than 1 piece / m 2 .
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Abstract
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