Tape and reel adhesive gone past date - Page 1
Forum section: electronics / general

author: cosmicray
author_rank: Frequent Contributor
timestamp: February 18, 2015, 03:47:47 am
content: Over the last month, I've accumulated a few reels of older passives. One of the things I've noticed is the trend of the adhesive, that held the tape to the backing, has gone beyond how I'd expect it should behave, and is now stuck to the leads. In some cases it's downright solidified. Soaking a sample bit of the tape in 70% IPA helps, but there is still residue on the wire leads. Is there any better method of getting it to release ?

author: Monkeh
author_rank: Super Contributor
timestamp: February 18, 2015, 04:01:52 am
content: You're not meant to release it, you cut the components off.

author: nixfu
author_rank: Unknown
timestamp: February 18, 2015, 07:03:48 am
content: Dave said just the other day to Chris that he is going to do a video about this very topic.Paging Dave. Time to make that video.As mentioned already, this is a "big trap for beginner players", CUT the leads and do not use the part of the leads that have touched the tape.

author: cosmicray
author_rank: Frequent Contributor
timestamp: February 18, 2015, 02:02:22 pm
content: Quote from: Monkeh on February 18, 2015, 04:01:52 amI did wonder if that might be the case. Thanks !

author: kayvee
author_rank: Regular Contributor
timestamp: February 18, 2015, 02:16:02 pm
content: It's more of a hassle to clip each lead off the tape but that is what I normally do in such cases.If you try and pull them of the strip you are left with sticky ends that stick to all the others in the pile, very annoying. Certainly not worth cleaning off, no time for faffing around with that.

author: cosmicray
author_rank: Frequent Contributor
timestamp: February 18, 2015, 03:23:48 pm
content: I think my confusion with this comes from the tape holding SMD components in their little pockets. That tape releases cleanly (and partly because it does not make contact with the leads). The T&R for the older axial/radial lead passives must be designed to hold the component in a predictable position.So which way are the active components (e.g. TO-92) packaged on T&R ? Are they also expected to be cut off ?

author: SeanB
author_rank: Super Contributor
timestamp: February 18, 2015, 05:46:58 pm
content: Tape and reel is designed for an auto inserter, which as a matter of course removes the parts from the tape by cutting the leads short, while at the same time it does a preforming operation on the short leads to fit the board spacing. You get 2 strips coming out of the machine into a waste bin or a take up spool with the tape and the cut off wires mixed together. That then is collected as scrap and sold to a metal recycler, who typically just burns off the paper to recover the copper or steel leads.

author: free_electron
author_rank: Super Contributor
timestamp: February 18, 2015, 07:47:09 pm
content: wait. hang on. these are devices with pins ? like thru hole resistors and capacitors ?if both pins are on the same side then we call that ammo-pack , not tape and reel.tape and reel is for SMDtape is for axial partsammo pack if for radial parts

author: gman4925
author_rank: Regular Contributor
timestamp: February 18, 2015, 07:59:35 pm
content: Thishttp://www.cutbend.com/will give you an idea of the tool used to cut the parts off the tape and bend them just right.

author: cosmicray
author_rank: Frequent Contributor
timestamp: February 18, 2015, 08:03:10 pm
content: Quote from: free_electron on February 18, 2015, 07:47:09 pmPerhaps, but I havecardboard reelsof LEDs and caps (leads on the same side). I also have cardboard reels of resistors, with leads on opposite sides. I have one box (presumably what I would call an ammo pack) of amber LEDs with leads on the same side. All of those devices have a paper adhesive tape holding the components in place. Most of them have an additional kraft paper layer.

author: free_electron
author_rank: Super Contributor
timestamp: February 18, 2015, 08:26:08 pm
content: leds are ammo packresistors with tape on both sides are called simply 'tape in box' or 'tape', sometimes called 'ribbon tape'.Look at the led's the cardboard thing will have holes at regular intervals and will be stacked like an accordeon. that is ammopack.a cardboard 'reel' is not called a reel.'tape and reel' always indicates surface mountThe tape you describe isn't bad until it separates all by itself ( glue gone bad ) . Then you have an issue, as that will clog up the machine. So 'past date' would mean in this case the parts fall out of the tape by themselves. Your's are perfectly fine.Parts are simply cut off the tape.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: February 18, 2015, 08:41:28 pm
content: Let's ask my grandmahttp://www.shorpy.com/node/13217yup, leads are cut...Dynasert is where it all started AFAIK

author: edavid
author_rank: Super Contributor
timestamp: February 18, 2015, 09:22:05 pm
content: Quote from: free_electron on February 18, 2015, 08:26:08 pmYou should be sure to tell the through hole component makers and distributors that, so they can change all their datasheets and websites.Just to give one example:http://parts.arrow.com/item/detail/yageo/mf0204dre52-24r3"Packaging: Paper Tape and Reel"

author: cosmicray
author_rank: Frequent Contributor
timestamp: February 18, 2015, 09:43:52 pm
content: Quote from: free_electron on February 18, 2015, 08:26:08 pmThe LEDs that I have (red & green) are wound circularly on a (cardboard) reel. The amber LEDs are laid in alternating directions, within a box, in one continuous tape. All the LEDs have the hole in the tape between individual devices.I also have some metal power connecting crimp pins would on a reel, with a metal tape. They have to be broken off (or cut off) before being crimped. A kraft backing loosely separates layers on that reel. That reel is larger than the others (which measure 11-inch across).

author: mzzj
author_rank: Super Contributor
timestamp: February 19, 2015, 10:35:55 am
content: Quote from: cosmicray on February 18, 2015, 03:47:47 amWait a couple of years more and the glue will turn into fragile white powder. Slightest touch and the components will fall to a tangled mess

author: cosmicray
author_rank: Frequent Contributor
timestamp: February 19, 2015, 01:57:46 pm
content: Quote from: mzzj on February 19, 2015, 10:35:55 amThis is MIL-spec adhesive. It will last forever (like the Titanic).To be fair tho, I opened a brand new (but over 10 year old) reel of Xicon resistors last night. The adhesive is perfect. A small amount of IPA soaking, and nothing sticking to the leads. I wish they were all that good.Quote from: SeanB on February 18, 2015, 05:46:58 pmDid the leads ever contain small amounts of Pb ? That might not be a good thing to incinerate.