'cuts' in the treads in the tops of plastic soda bottles.

Subject: 'cuts' in the treads in the tops of plastic soda bottles.

Date: Tue Feb 1 23:41:28 2000
Posted by Ray Merritt
Grade level: 4-6 School: Olney School
City: Astoria State/Province: OR Country: USA
Area of science: Engineering
ID: 949470088.Eg

Message:


I'm curious about the "cuts" in the treads in the tops of plastic soda 
bottles.  If you look at the necks of soda bottles they are treaded for the 
tops to screw down but those treads on the necks aren't intact. I want to 
know why those treads have sections missing and why they only appear on 
soda bottles.  


Thanks,

Ray

4-5th grade teacher
Olney School

Re: 'cuts' in the treads in the tops of plastic soda bottles.

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