PKSC 4300 - Test #2
1. What does TIAG stand for?: Time In the Air Gap
2. Straight directional tear is property of what kind of films?: monoaxially oriented films
3. What is true of edge guides?: they keep the web centered, edge can be sensed by electric eye system,
the sensor is U-shaped, and the edge can be sensed by an air blower system
4. What is true about orientation methods?: tenteref offers better film flatness than double bubble
due to the extrusion process, monoxial means one-direction, double bubble and simultaneous tenter give more
balanced properties than sequential
5. What does a corona treatment do?: cleans the surface, creates free radicals, promotes adhesion,
inhibits sealabillity
6. Why do we extrude?: able to put 2 films together as one is made; cheaper and less time than lamination;
with lamination both films are made and then put together
7. How do you calculate the BUR?: BUR = diameter of bubble/diameter of die
1/2
, 8. What do gauge die bolts do?: control evenness of film
9. What do we do with edge beads when making lamination films?: cut them off
10. How do we utilize edge beads when orienting with a tentering frame?: guides
the web
11. We use beta-ray guages to determine the uniformity of extrusion thickness
across the web. According to Dunn, what other methods can be used?: x-ray
transmission
x-ray backscatter
gamma-ray backscatter
infrared transmission
12. What is true of surface tension?: - has higher energy than bulk
- takes more force to "punch into" a droplet that to travel through it afterwards
- measured with goniometer
- different liquids have different surface tensions
13. Dunn classifies blown film as what kind of process?: tubular
2/2
1. What does TIAG stand for?: Time In the Air Gap
2. Straight directional tear is property of what kind of films?: monoaxially oriented films
3. What is true of edge guides?: they keep the web centered, edge can be sensed by electric eye system,
the sensor is U-shaped, and the edge can be sensed by an air blower system
4. What is true about orientation methods?: tenteref offers better film flatness than double bubble
due to the extrusion process, monoxial means one-direction, double bubble and simultaneous tenter give more
balanced properties than sequential
5. What does a corona treatment do?: cleans the surface, creates free radicals, promotes adhesion,
inhibits sealabillity
6. Why do we extrude?: able to put 2 films together as one is made; cheaper and less time than lamination;
with lamination both films are made and then put together
7. How do you calculate the BUR?: BUR = diameter of bubble/diameter of die
1/2
, 8. What do gauge die bolts do?: control evenness of film
9. What do we do with edge beads when making lamination films?: cut them off
10. How do we utilize edge beads when orienting with a tentering frame?: guides
the web
11. We use beta-ray guages to determine the uniformity of extrusion thickness
across the web. According to Dunn, what other methods can be used?: x-ray
transmission
x-ray backscatter
gamma-ray backscatter
infrared transmission
12. What is true of surface tension?: - has higher energy than bulk
- takes more force to "punch into" a droplet that to travel through it afterwards
- measured with goniometer
- different liquids have different surface tensions
13. Dunn classifies blown film as what kind of process?: tubular
2/2
