Attention to detail in the tape

Student: The things hidden in the slider and elements were really interesting! Are there any secrets hidden in the tape, too? YKK employee: Let's take a closer look at the zipper tape, then.
YKK employee: Even in the same piece of tape, there are different parts. What do you think sections 1, 2, and 3 are in the diagram? Student: What? Um... What are they?
YKK employee: The answer is... (1) Where the elements are attached (2) Where the slider travels(The part that comes into contact with the slider) (3) The part sewn onto clothes or bags Student: Oh, I see!
YKK employee: Each part of the tape is designed with its specific role in mind, so there are differences even on the same tape. Student: So the structure is different depending on where on the tape it is.
YKK employee: That's right. For example, section (1) is shaped like a piece of string so the elements can be attached securely. Student: The edge of the tape is round, like string!
YKK employee: (2) is designed so it won't fray when rubbed by the metal slider,and (3) is designed to be sewn easily onto clothes and bags. Student: I never imagined so many details were hidden in the tape!
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  5. Vol.6 Attention to detail in the tape