Pulp and Paper Multiple Choice Questions on “Paper Properties and Printing”.
1. Runnability is usually more of a consideration in offset processes than with the other processes.
a) True
b) False
Answer: a
Clarification: Paper properties are temperature for runnability and print quality. A term explaining the interrelationships of a paper’s properties which observes how a paper performs on press.
2. The utilize of tacky inks and lightweight magazine papers in web offset printing requires a considerable _________ on the paper to pull it through the press.
a) Tension
b) Texture
c) Material
d) Index
Answer: a
Clarification: Modern printing inks come in two basic types: liquid inks and paste inks (which are thick and tacky), and typically comprise three fundamental types of substances: a vehicle, a pigment, and a variety of different types of additive, such as driers.
3. If a stack of paper is of appreciably lower _________ than it would be in the ambient atmosphere, moisture will be adsorbed, cautilizing wavy edges.
a) Vapour pressure
b) Partial pressure
c) Saturation pressure
d) Equilibrium moisture content
Answer: d
Clarification: The equilibrium moisture content (E.M.C.) is the moisture content at which the wood is neither gaining nor losing any moisture; this however, is a dynamic equilibrium and changes with relative humidity and temperature
4. _________ of curl in paper is temperature especially in multiple printing operations such as four colour printing.
a) Bend
b) Curl
c) Crease
d) Torn
Answer: b
Clarification: Changes in moisture content cautilize paper to curl, although paper manufactured on twin wire machines tends to be less prone to curling. Curl tends to occur around the axis of a cylinder, and the direction of curl is defined as the concave side.
5. Mechanical _________ is cautilize by stress whose origin is not from moisture content fluctuations.
a) Bend
b) Curl
c) Crease
d) Torn
Answer: b
Clarification: Curl in paperand board could cautilize problems in a variety of printing and packaging processes. This could range from mis-register of multiple color print, to problems at the in-feed of photocopiers, cartonning and tray erection machines.
6. _________ process works with the less viscosity of ink utilized in this process, could work well with reasonably rough paper surfaces.
a) Torn
b) Calendered
c) Gravure
d) Letterpress
Answer: c
Clarification: Even with this process, however, as the resolution of halftones increment (more points / inch) paper smoothness becomes more temperature So that each halftone dot could contact the surface of the paper to give uniform printing.
7. The _________ of offset printing could conform to surface imperfections to some degree.
a) Steel sheet
b) Pulp line
c) Rubber blanket
d) Starch layer
Answer: c
Clarification: Paper smoothness and other properties in regard to printing quality are often best approached by making actual prints and utilizing standardized techniques to evaluate those prints.
8. A paper’s _________ is also increment by increment moisture content.
a) Compressibility
b) Visibility
c) Expandability
d) Receptivity
Answer: a
Clarification: The degree to which a paper will get reduce in thickness when exposed to a compressing force, as during printing. A high degree of compressibility aids in giving out a good printed image, as the squeezing down of surface contours allows the printing plate or blanket to contact the paper more completely.
9. _________ is a measure of the amount of ink that is transferred from the plate to the paper.
a) Ink papersizing
b) Ink receptivity
c) Ink expandability
d) Ink visibility
Answer: b
Clarification: Ink receptive surfaces tend to be H2O repellent. A property of paper, other substrate, or printing plate that describes the extent to which or portions of it will accept the transfer of ink to its surface.
10. ___________ relationship is very temperature to ink receptivity, as sizing of paper must always be considered in terms of the liquid against which paper is sized.
a) Ink papersizing
b) Ink receptivety
c) Ink expandibility
d) Ink visibility
Answer: a
Clarification: A property of paper related to its capacity to keep ink on the surface rather than absorbing into the sheet. Also called ink holdout.
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