Technical Article: The Necessity of Obtaining Closure Samples and Information Prior to a Plastic Bottle Production Run
by Stuart Feen, President, Plastic Bottle Corporation
Virtually all manufactured parts have a plus or minus (+/-) range of dimensional acceptability (tolerances), and plastic bottles and closures are no different, except that their ranges may be greater than some types of products and less than some other types. Because closures and bottle necks represent a variety of manufacturing variabilities and tolerances, even if they are within specifications, which can affect mating possibilities of one to the other, we always need to know what closures, sprayers or finger tip sprayers/pumps are to be used on our bottles. When we receive the order, we ask for the closure, sprayer, or finger tip sprayer/pump manufacturers specifications and ask for samples of the closure, sprayer or pump to be used on our bottle.
Definitions and Discussion
When taking any order we first need to ask what closure is to be used with the bottle. We need to know the closure size and manufacturer. If the closure is a regular, non-dispensing 400, 410, or 415 size with a non-induction seal or pressure sensitive liner, then we might be o.k. without getting samples from the customer as long as we get all of the dimensional specs. However, to be entirely safe we should still ask for samples of these least problematic of closures for testing.
Any other neck specs the closure manufacturer wishes to call out
If the closure has an induction seal or pressure sensitive liner, then we MUST be certain to obtain from the closure manufacturer the MINIMUM LAND their closure requires for use with induction seal or pressure sensitive liners. This will in turn define the I.D.
Lastly, while talking about the neck, it is always nice to know the diameter of the customers fill tubes. The buyer or purchasing agent may not know this, so it is especially important to ask them if they have checked the samples we sent to them on their filling lines and especially with their fill tubes. An I.D. that is consistent with all of the above requirements is then specified on orders for that customer for that bottle with the particular closure.