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Which pulping process is suitable for manufacturing of the middle layer of multi-ply boards?

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in Food Packaging Technology by (63.0k points)
Which pulping process is suitable for manufacturing of the middle layer of multi-ply boards?

(a) Mechanical pupling

(b) Kraft pulping

(c) Thermomechanical pulping

(d) Chemithermomechanical pulping

I had been asked this question during an interview.

My enquiry is from Mechanical Pulping in chapter Paper and Paper Based Packaging Materials of Food Packaging Technology

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Best answer
Correct answer is (d) Chemithermomechanical pulping

The best I can explain: Chemithermomechanical pulping – CTMP is suitable for the middle layer of multi-ply boards. It is because CTMP pulps have a greater long fiber fraction and lower fines fraction than comparable thermomechanical pulping -TMP pulps.

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