I'm pretty sure it's there so that ejector pins can also be used. I think
some of our Panasert feeders have pin ejectors.

Martin

===== Original Message from [log in to unmask] (TechNet E-Mail Forum.) at
5/07/00 20:23
>In a message dated 07/05/2000 4:03:04 PM Central Daylight Time,
>[log in to unmask] writes:
>
>> Hi TechNet
>>
>>  What is the purpose of the hole on the bottom of the carrier tape for SMT
>>  components? Is there any advantage having it there?
>>
>>  Harold Papazian
>
>Hi Harold!
>
>Your question prompts another question; why are you asking the question? ;^}
>I have never thought about it before...it must be an issue for you, or you
>wouldn't be asking why. Can I ask why?
>
>I can only guess, since I'm not involved in the design of carrier
>tapes...I'm
>just trying to think logically...so here is my best guesses:
>
>1. The holes are from the tooling used during the embossing process of the
>tape to ensure that the plastic pockets are positionally accurate in
>relation
>to the sprocket holes of the tape.
>
>2. The holes are a means to prevent any low pressure or suction force being
>generated when the component is being picked from the pocket by the pick and
>place machine...the machines snatch the components pretty darn quick! I
>could
>envision that there could be a suction generated if there wasn't a hole
>there
>on some components...
>
>3. The hole may be there to prevent equalize pressure...say if the
>components
>were taped at sea-level, and then shipped to Denver being sealed, the seal
>of
>the cover tape could rupture...
>
>4. You might smother the components and suffocate them..;^}
>
>5. The components need a place to take leak too...;^}
>
>Forgive my bizarre humor...I must say though, a very intriguing question!
>
>-Steve Gregory-
>
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