(19) What are the general classifications of heat sealing equipment?
ANSWER: ___________________________________________________________________________
(20) Why do some heat sealers employ "preheaters"?
ANSWER: ___________________________________________________________________________
___________________________________________________________________________
(21) What is the weight limitation of contents for the Class 1 metal stayed box? (A-A-866)
ANSWER: ___________________________________________________________________________
(22) Which ply of a heat sealable barrier allows for the printing of identification information?
ANSWER: ___________________________________________________________________________
(23) Many heat sealable barrier materials are constructed of three layers. List them.
ANSWER: a. _________________________________
b. _________________________________
c. _________________________________
(24) Which ply provides the greaseproof, waterproof, or water-vaporproof characteristics to the barrier material?
ANSWER: ___________________________________________________________________________
(25) List the three essential factors for proper heat sealing.
ANSWER: a. __________________________________
b. __________________________________
c. __________________________________
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