COATING METHODS
Quiz
Complete these exercises at your leasure and mail me with your score. Good Luck!
Which of the following is not a type of coater?
- Brush coater
- Curtain coater
- Comb coater
- Kiss coater
What is the main function of the traditional size press?
- To apply pigmented film forming coatings to the surface of the sheet
- To apply non-pigmented film forming coatings to the surface of the sheet
- To apply pigmented non-film forming coatings to the surface of the sheet
- To apply non-pigmented non-film forming coatings to the surface of the sheet
Which was the first type of size press?
- Horizontal
- Inclined
- Metered
- Vertical
What is the main disadvantage of the horizontal size press?
- It uses too much space
- Both sides of the sheet need to be sized
- The web path damages the sheet structure
- Pick-up cannot be controlled
Which variable does NOT substantially affect pickup in a size press?
- Nip pressure
- Pond depth
- Roll hardness
- Web absorbency
The optimum moisture content of the sheet as it enters the size pres is said to be in what range?
- 1-5%
- 3-7%
- 5-10%
- 8-15%
Which type of size press is considered to be the most significant advance in size press technology?
- Horizontal
- Inclined
- Metered
- Vertical
Which type of coating requires the lowest viscosity of coating mix?
- Air knife
- blade
- Rod
- Roll
When considering blade coating there are three considerations, what are they?
- How concentrated the mix is, how long it will stay there, and how it is taken off
- How the coating is applied, how the solids content will change, and how it is taken off
- How the coating is applied, how long it will stay there, and how it is taken off
- How the coating is applied, how long it will stay there, and how the solids content will change
How do the bent blade and the stiff blade compare from an operational point of view?
- With increased pressure both the bent and stiff blades give an increased coat weight
- With increased pressure both the bent and stiff blades give a decreased coat weight
- With increased pressure the bent blade increases coat weight and the stiff blades reduces coat weight
- With increased pressure the bent blade reduces coat weight and the stiff blades increases coat weight
What is unusual about the method of cast coating?
- The way the coating is applied to the sheet
- The way excess coating is removed from the sheet
- The way the coating is dried
- The solids content of the coating mix
What pigment is usually used for cast coating?
- Calcined clay
- Gypsum
- Kaolin
- Satin white
What is the typical pH for a cast coating mix?
- 1-3
- 3-6
- 6-9
- 9-12
Which of the following coating methods runs fastest?
- Air knife
- Metered size press
- Roll applicator
- Size press
Which of the following coating processes can apply the highest coat weight?
- Air knife
- Bill blade
- Metered size press
- SDTA
What is the typical viscosity of a size press mix?
- 300 cps
- 600 cps
- 900 cps
- 1200 cps
What is the typical solids content of a coating colour used for Air Knife coating?
- 25%
- 45%
- 55%
- 65%