'melted' gooey rubber drive bands

[N Cook]

Went to my collection of assorted bands today and I assume because of summer
heat one had disintegrated into a gooey mess and another one on the way
out.
Anyone any ideas on storing bands eg in a freezer ?, under water ?.
and how to remove the goo thats splurged across adjascent bands.

I'm thinking of dousing all the bands in talcum powder - theory being that
if one goes gooey then the liquid black would stand out against the now
light grey of dusted bands and less likely to stick to adjascent bands.
I'm trying steeping the gooey contaminated bands in washing-up liquid.

 

[Wayne Tiffany]

My first thought was that it was not the heat that got them, but
incompatible plastics. I have seen this happen before - a plastic worm
sitting in a plastic tackle box rather than in its bag, finding the plastic
foot of a Woody doll dissolved from touching another plastic doll in the toy
box, etc. Not all combinations do it, but I've seen it several times.

WT

 

[[email protected]]

Went to my collection of assorted bands today and I assume because of summer
heat one had disintegrated into a gooey mess and another one on the way
out.
Anyone any ideas on storing bands eg in a freezer ?, under water ?.
and how to remove the goo thats splurged across adjascent bands.
I'm thinking of dousing all the bands in talcum powder - theory being that
if one goes gooey then the liquid black would stand out against the now
light grey of dusted bands and less likely to stick to adjascent bands.
I'm trying steeping the gooey contaminated bands in washing-up liquid.

This happened all the time to Philips drive bands in tape recorders of
the sixties and seventies. I'd have thought they had changed the
formulation of the rubber by now...

 

[N Cook]

My first thought was that it was not the heat that got them, but
incompatible plastics. I have seen this happen before - a plastic worm
sitting in a plastic tackle box rather than in its bag, finding the plastic
foot of a Woody doll dissolved from touching another plastic doll in the toy
box, etc. Not all combinations do it, but I've seen it several times.

WT

If you store "rubber" grommets in hard plastic multi-drawers it is
guaranteed to plasticise the hard drawer plastic into a mess.
These bands were stored in open air on long cardboard cones for easy sizing
..
Neat Washing up liquid doesn't work but cotton wool and methylated spirits a
couple of times after washing fingers does remove the goo.

 

[[email protected]]

This happened all the time to Philips drive bands in tape recorders of
the sixties and seventies. I'd have thought they had changed the
formulation of the rubber by now...

Which reminds me, Philips actually did. In all of their videorecorders
from 1986 up to 2002 I have had to replace maybe 1 drive belt that
stretched a bit, never had one turn to liquid like they used to. On the
other hand, in the same time period their pinch rollers were a disaster.
Turning from soft rubber into a hard glass-like material, sometimes
only after 1 or 2 years of usage.

 

[N Cook]

Anyone know how square, flat or round drive belts are manufactured?

 

[Tom MacIntyre]

Which reminds me, Philips actually did. In all of their videorecorders
from 1986 up to 2002 I have had to replace maybe 1 drive belt that
stretched a bit, never had one turn to liquid like they used to. On the
other hand, in the same time period their pinch rollers were a disaster.
Turning from soft rubber into a hard glass-like material, sometimes
only after 1 or 2 years of usage.

Years ago when I was a kid we had a phono turntable that had the
problem of the rubber roller losing material onto the metal shaft it
drove. Needless to say, the pitch didn't hold up well at all.

What a riot...I very nearly sent this with "needles to say".

Tom

 

[Michael A. Terrell]

Anyone know how square, flat or round drive belts are manufactured?

The flat and square are molded as a long tube, then they are sliced
off to the required width.

The round are molded to the proper diameter either to the finished
size, or as a long bulk piece that is cut to size and glued.

Onieda used to sell a kit of bulk flat, square and round rubber along
with a cutting jig and a tube of industrial crazy glue to make custom
belts. The glue has to be VERY fresh or it didn't hold for very long.


--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida

 

[N Cook]

The flat and square are molded as a long tube, then they are sliced
off to the required width.

The round are molded to the proper diameter either to the finished
size, or as a long bulk piece that is cut to size and glued.

Onieda used to sell a kit of bulk flat, square and round rubber along
with a cutting jig and a tube of industrial crazy glue to make custom
belts. The glue has to be VERY fresh or it didn't hold for very long.


--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida

Appreciated.
Would the flat/square process be done hot and the slicing done hot or when
cooled down ?

 

[N Cook]

The flat and square are molded as a long tube, then they are sliced
off to the required width.

The round are molded to the proper diameter either to the finished
size, or as a long bulk piece that is cut to size and glued.

Onieda used to sell a kit of bulk flat, square and round rubber along
with a cutting jig and a tube of industrial crazy glue to make custom
belts. The glue has to be VERY fresh or it didn't hold for very long.


--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida

come to think of it , the round section bands I've sometimes seen trace of a
seam line
presumably from the edges of a 2-part mould where they join imprecisely.

 

[Michael A. Terrell]

Appreciated.
Would the flat/square process be done hot and the slicing done hot or when
cooled down ?

I don't know. I posted what I was told by one of my suppliers years
ago that manufacured replacement belts.

--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida

 

[bz]

I don't know. I posted what I was told by one of my suppliers years
ago that manufacured replacement belts.

In the early 70s, I used such a kit to make replacement bands.

The cutting and gluing was done 'cold'.

Surfaces to be glued must be clean very and oil free.

Freshly cut with a clean blade worked rather well, if I remember
correctly.




--
bz

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

[email protected] remove ch100-5 to avoid spam trap

 

[b]

Which reminds me, Philips actually did. In all of their videorecorders
from 1986 up to 2002 I have had to replace maybe 1 drive belt that
stretched a bit, never had one turn to liquid like they used to. On the
other hand, in the same time period their pinch rollers were a disaster.
Turning from soft rubber into a hard glass-like material, sometimes
only after 1 or 2 years of usage.

yesterday i restored an old philips reel to reel from around 1963.
strange thing was, the main belt was fine , but the rubber brake
blocks, take up spool belt and take up spool clutch `s rubber insides
had all turned to goop. Pinch roller was hardened on the outside but
springy under that outer layer. my usual method is to scrape as much
off the pulleys as possible with a screwdriver before trying to mop up
the rest with tissues and q-tips dipped in alcohol.

Talking about vcr`s, As you mentioned,I`ve found the pinch rollers on
the turbo and `charley` decks to die really quickly by turning hard.
Also a few even newer (less than 4 years old) Aiwa models - turned bad
way too soon in my opinion!

B.

 

[Michael A. Terrell]

In the early 70s, I used such a kit to make replacement bands.

The cutting and gluing was done 'cold'.

Surfaces to be glued must be clean very and oil free.

Freshly cut with a clean blade worked rather well, if I remember
correctly.

The glue had to be fresh, too. The shop had the kit, but I never
used it because I always had the right belts, or I would order one from
PRB. We stocked about 200 different OEM or PRB belts and there was
always a list of belts we were low on so the minimum order was no
problem. Some of the other techs used it with a few problems.


--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida

 

[Asimov]

"Wayne Tiffany" bravely wrote to "All" (11 Aug 05 07:35:39)
--- on the heady topic of "Re: 'melted' gooey rubber drive bands"

It is the plasticizer used in the silicon rubber or plastic that
catalyzes a reaction between the two surfaces. I recall leaving a
vinyl guitar chord on the plastic case of some gear for about 1-1/2
month and when I got back to it the plastic surface had dissolved in a
tiny puddle of the chord vinyl. Where it had touched it left a small
pit on the surface of the gear. Also, the vapours from some types of
caulking materials, such as polyurethane, also cause deterioration of
plastics, rubber, and vinyl in immediate the vicinity to where they
were applied. They don't warn, on the tubes, about this damaging
aspect of the solvent to other bystanding organic materials!

A*s*i*m*o*v


WT> Reply-To: "Wayne Tiffany" <[email protected]>
WT> Xref: core-easynews sci.electronics.repair:339496

WT> My first thought was that it was not the heat that got them, but
WT> incompatible plastics. I have seen this happen before - a plastic
WT> worm sitting in a plastic tackle box rather than in its bag, finding
WT> the plastic foot of a Woody doll dissolved from touching another
WT> plastic doll in the toy box, etc. Not all combinations do it, but
WT> I've seen it several times.
WT> WT

Went to my collection of assorted bands today and I assume because of
summer
heat one had disintegrated into a gooey mess and another one on the way
out.
Anyone any ideas on storing bands eg in a freezer ?, under water ?.
and how to remove the goo thats splurged across adjascent bands.

I'm thinking of dousing all the bands in talcum powder - theory being that
if one goes gooey then the liquid black would stand out against the now
light grey of dusted bands and less likely to stick to adjascent bands.
I'm trying steeping the gooey contaminated bands in washing-up liquid.

.... [] <- Please write your complaint legibly in that box.