Question

The presteaming temperature for thermochemical pulping is _______

(a) 110°C – 150°C

(b) 150°C – 200°C

(c) 200°C – 250°C

(d) 250°C – 300°C

The question was asked in an internship interview.

The query is from Mechanical Pulping in chapter Paper and Paper Based Packaging Materials of Food Packaging Technology

Answer 1

Right answer is (a) 110°C – 150°C

The best I can explain: Thermomechanical pulping (TMP) presteams chips between 110°C and 150°C so that they become malleable and do not fracture readily under the impact of the refiner bars. This material is highly flexible and gives good bonding and surface smoothing to the paper.