Question

Which of the following pulping processes was developed in 1950s?

(a) Sulphite process

(b) Kraft process

(c) Refiner mechanical pulping process

(d) Screw pulping process

I had been asked this question in an online interview.

Query is from Mechanical Pulping in division Paper and Paper Based Packaging Materials of Food Packaging Technology

Answer 1

Correct option is (c) Refiner mechanical pulping process

The explanation: In the 1950s, the refiner mechanical pulping (RMP) process was developed, which produced a stronger pulp and utilized various supplies of wood chips, sawmill residues and sawdust. RMP results in more long fibers than stone groundwood and subsequently stronger paper. However, the energy requirements of RMP are higher and the pulp does not have the opacity of groundwood fibers.