PKSC 4300: Seals Exam
1. What is a seal?: method of closing a package using the flow and adhesion/cohesion properties of a plastic
material
2. What is the purpose of a seal?: - prevents product loss, tampering, and theft
- prevents microbial growth
- separates the product from the environment
3. What is a heat seal?: a seal made using a thermoplastic material whose temperature is elevated by some
addition of energy
4. What is required to make a seal?: - two or more materials
- a process to bring them together
- correct time, energy, and pressure
5. Describe the general heat sealing method: 1) pressure pushes the sealant together
2) heat increases the temperature of all layers
3) sealant melts and entangles with other layer
4) seal area cools and become solid
6. heats, cools: conduction heats (touch), convection cool (cools slower)
7. True or false
1. What is a seal?: method of closing a package using the flow and adhesion/cohesion properties of a plastic
material
2. What is the purpose of a seal?: - prevents product loss, tampering, and theft
- prevents microbial growth
- separates the product from the environment
3. What is a heat seal?: a seal made using a thermoplastic material whose temperature is elevated by some
addition of energy
4. What is required to make a seal?: - two or more materials
- a process to bring them together
- correct time, energy, and pressure
5. Describe the general heat sealing method: 1) pressure pushes the sealant together
2) heat increases the temperature of all layers
3) sealant melts and entangles with other layer
4) seal area cools and become solid
6. heats, cools: conduction heats (touch), convection cool (cools slower)
7. True or false
