PKSC 2020 Test 2 Review Questions
1. What is the difference between a sheet feeder plant and a sheet plant?: A sheet
feeder plant manufactures boards for converters in sheet form; also known as a corrugator plant
A sheet plant buys sheets from the sheet feeder and then converts; also known as a box plant
2. What grade of pulp is used to make linerboards?: Softwood Kraft pulp (can have up to 20%
recycled)
3. What papermaking process is used to make linerboard?: Duplex fourdrinier process
4. What grade of pulp is used to make medium?: Semi-chemical (NSSC) unbleached hardwood
pulp (virgin and recycled)
5. What papermaking process is used to make medium?: Fourdrinier or cylinder
6. What type of adhesive is used to combine the container boards?: Water based starch
adhesive (corn or wheat)
7. What are the two types of containerboard used to manufacture corrugated
1/5
, boards?: Linerboard and fluting medium
8. What are the units for the basis weight of the corrugated board?: lbs/1000 ft^2
9. Why are the grades of linerboard used for the facings of corrugated boards
stronger in the cross direction?: The way the flutes/fibers lay in the cross direction helps with stacking
strength and holds up better with edge crush test; ultimately, the cross direction board facings are exceptionally
stronger
10. Know the details of the gluing process for combining medium and liner
boards.: Passes through the corrugating rolls
Tips of the flutes are coated with adhesive
First liner is pressed to the fluted medium
Goes over the bridge (corrugations are facing down)
Tips of the flutes are coated with adhesive and second liner is added
Double faced board passes between conveyor belt and top of heated plates
At this point it is a stiff board and goes through drying sections flat
Cut into sheets (also called blanks)
Glue is a type of coating, thus interacting with FDA regulations
2/5
1. What is the difference between a sheet feeder plant and a sheet plant?: A sheet
feeder plant manufactures boards for converters in sheet form; also known as a corrugator plant
A sheet plant buys sheets from the sheet feeder and then converts; also known as a box plant
2. What grade of pulp is used to make linerboards?: Softwood Kraft pulp (can have up to 20%
recycled)
3. What papermaking process is used to make linerboard?: Duplex fourdrinier process
4. What grade of pulp is used to make medium?: Semi-chemical (NSSC) unbleached hardwood
pulp (virgin and recycled)
5. What papermaking process is used to make medium?: Fourdrinier or cylinder
6. What type of adhesive is used to combine the container boards?: Water based starch
adhesive (corn or wheat)
7. What are the two types of containerboard used to manufacture corrugated
1/5
, boards?: Linerboard and fluting medium
8. What are the units for the basis weight of the corrugated board?: lbs/1000 ft^2
9. Why are the grades of linerboard used for the facings of corrugated boards
stronger in the cross direction?: The way the flutes/fibers lay in the cross direction helps with stacking
strength and holds up better with edge crush test; ultimately, the cross direction board facings are exceptionally
stronger
10. Know the details of the gluing process for combining medium and liner
boards.: Passes through the corrugating rolls
Tips of the flutes are coated with adhesive
First liner is pressed to the fluted medium
Goes over the bridge (corrugations are facing down)
Tips of the flutes are coated with adhesive and second liner is added
Double faced board passes between conveyor belt and top of heated plates
At this point it is a stiff board and goes through drying sections flat
Cut into sheets (also called blanks)
Glue is a type of coating, thus interacting with FDA regulations
2/5
