Question

Pulp and paper multiple questions. please give me answer

1. Fiber separation from wood chips during atmospheric disc refining process is likely occurred:

a) in middle lamella; b) between two fibers; c) in cell lumen; d) between S1 and S2 layers.

2. Trees transport organics nutrients mostly through:

a) wood fiber cells; b) pits between the fiber cells; c) vessel elements; d) barks

3. Which of the follow tissue element likely has the largest lumen diameter:

a) tracheid; b) ray cells; c) fiber; d) vessel element

4) Which following cell wall layer has the highest lignin concentration:

a) compound middle lamella; b) cell lumen; c) secondary cell wall layer 3; d) secondary cell wall layer 2

5) The H factor of a pulping schedule: 60 minutes temperature ramping to 170 degree C and then cook at 170 degree C for 123 minutes:

a) 1650; b) 900; c) 3500; d) 2000

Answer 1

1.) Fiber separation from wood chips during atmospheric disc refining process is likely occured in middle lamella.

2.)Trees transport organic nutrients mostly thorugh barks.

3.) fiber likely has the largest lumen diameter.

4.) Secondary cell wall layer has the highest lignin concentration.

5.) The H factor of a pulping schedule

for ramping to 170 degree - 60 minutes - H (factor) - 118

for cooking at 170 degree - 123 minutes - H ( factor) - 1883

Total H factor of the given pulping schedule is 2001. ( nearly 2000)