Substrates Final 2-1

Paper is manufactured from ________, which is derived from wood pulp.

Question 1Select one:

a. Plasticizers

b. Lignin

c. Cellulose fiber

d. Natural resins

c. Cellulose fiber

Chemical pulp is the fiber material obtained from wood and other vegetable raw materials by grinding.

True

False

False

Chemical pulps differ from mechanical pulp mainly in the fiber characteristics (they have more fibers and firmer, more supple ones) and a higher degree of whiteness.

True

False

True

Which of the following is the correct order of papermaking machine units?

a. headbox, press section, wire section, dryer section, calender, winding unit

b. headbox, wire section, press section, dryer section, calender, winding unit

c. headbox, wire section, calender, press section, dryer section, winding unit

d. headbox, wire section, press section, calender, dryer section, winding unit

headbox, wire section, press section, dryer section, calender, winding unit

The diluted bleached pulp/water mixture is pumped into the part of the papermaking machine.

Headbox

A section features rollers that compact and smooth the paper.

Press Section 

A section where mills make paper in huge rolls called reels or logs.

Winding unit

A wide, continuous belt of material similar to fine-mesh window screening.

wire section

A section where paper web undergoes a long gentle drying process against drying cylinders heated by steam.

Drying 

Why paper is coated?

a. To improve the sheet’s printability

b. To improve the sheet’s smoothness

c. To enhance the gloss level of a sheet

d. All of the above

d. All of the above

When specifying paper, the acronym C1S indicates which of the following?

a. Cast coated

b. Number one sheet (meaning highest quality)

c. Cover paper, 1 square meter

d. Coated on one side only

d. Coated on one side only

Any materials that can be printed on, such as paper, plastic, and fabrics.

Substrate 

Layer of clay (or calcium carbonate) and other substrates applied to base stock to create the surface of coated paper.

Coating

Paper with a coating of clay (or calcium carbonate) and other substances that improves reflectivity and ink holdout.

Coated paper

Paper that has not been coated with clay. Also called offset paper.

Uncoated Paper

Paper made exclusively from pulp from trees or cotton, as compared to recycled paper.

Virgin Paper

New paper made in part from old paper.

Recycled Paper

Polishing the paper surface without adding chemicals or coatings to the paper.

Calendaring

Mixture of wood and/or cotton fibers, chemicals, and water from which mills make paper.

Pulp 

Groundwood pulp produced by mechanically grinding logs or wood chips. It is used mainly for newsprint and as an ingredient of base stock for lower grade publication papers.

Mechanical Pulp

In papermaking, treatment of groundwood chips with chemicals to remove impurities such as lignin, resins, and gums.

Chemical pulp