[QuadList] Plasticizer

[Trevor Brown]

Great minds think alike Bob it was 420 not 400 and late chroma 90

It seemed to be part of the development process Memorex hit it first, but
did not rename the tape so early Chroma 90 was Ok late was not

When 3m's hit the problem they renamed the tape from 400 to 420 and put it
in brown boxes so that's easy to identify

 

Lots of it never went back because it was fine when recorded on and checked,
but when replayed later the problem kicked in

It was the binder that caused it

 

But the problem was 2 " only and was all sorted before 1"

There are lots of programs out there recorded on both these faulty 2" stocks

Trevor

UK member

 

From: quadlist-bounces at quadvideotapegroup.com
[mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of
rabruner at aol.com
Sent: 17 March 2010 22:20
To: quadlist at quadvideotapegroup.com
Subject: Re: [QuadList] Plasticizer

 

If I am thinking of the same thing you are describing, there were two
incidents I can recall from the era of the 70s and 80s.  I believe it mostly
affected 3M tape.  The tape would precipitate a white powdery residue that
would stick to guides and fixed heads on the machines during play and then
on rewind, it would scratch the tape.   At first there was a considerable
reluctance to admit there was a problem, but then after a time,, 3M had a
program to swap out reels that had the issue. It's been a while but I think
this affected 400 series tapes, maybe 420?  I am sure not every reel got
returned, so there is probably still some of it out there.  I don't believe
there was ever any definitive explanation of what had happened, evidently
some change in a manufacturing process that had to be undone . .. 

Bob Bruner

W9TAJ

Attached Message


From:

Walter Forsberg <walterforsberg at gmail.com>


To:

quadlist at quadvideotapegroup.com


Subject:

[QuadList] Plasticizer


Date:

Wed, 17 Mar 2010 10:15:02 -0500

Hello Quad Groupers-

 

I'm looking for info / documentation / personal experiences any of you may
have had with white plasticizer, offering itself up from the winds/packs of
2" and 1" videotape. 

 

Specifically, are there any trends or commonly believed reasons for this
stuff appearing? (Eg. specific stocks, a particular environmental storage
condition, or manufacturer's container / reel materials.)

 

I'd also be happy to receive a quoted forward of past discussions on this
topic, as I'm a relative newbie to the list. 

 

Happiest shamrocks & thanks in advance,

 

Walter Forsberg

NYU-MIAP

 

 

 

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