mint/bank roll storage

[ausjack]

while we are going on about storage just wondering how people store mint/bank rolls and do you stand them on end or lay them flat and why

[robbiegal]

flat in cellophane bags

[ausjack]

sorry it sounds silly but why flat and why cellophane

[robbiegal]

why is it so, grasshopper?

[ausjack]

that is not an answer..so how many reds have you had robbie :winkextra:

[robbiegal]

ok seriously

the flat bit - cause they are in containers that are not high, so they lay flat,
cellophane - inert and acid free
and easy to buy and I like it - I wrap it tight like a roll within a roll
I also put all my postcards & store coins in them
I get them on ebay from Plaza DJ - great service & fast & cheap

[ausjack]

Thank you very much, appreciate it mate :thank_you: interested to hear what others do as well

[r9453]

Watch this at 1:35 actually you might like the whole shebang :scared:

[ausjack]

:blink:

[Fulvio]

cellophane - inert and acid free

Huh? You mean apart from being biodegradable, permeable and involving lots of nasties in its manufacture?

I'll stick with Mylar™ (Polyester) or Polyethylene, thanks.

[purplepennyhunter]

Clear polypropylene (PP :winkextra:) -similar to cellophane.

I store my PNC's in these (when I throw out the PVC) and The Purple Penny uses them for packaging.

PlazaDJ

[Fulvio]

Clear polypropylene (PP :winkextra:) -similar to cellophane.

Oh, I wish websites didn't do that. Similar indeed... they're both transparent I guess.

http://en.wikipedia.org/wiki/Cellophane

"Cellulose from wood, cotton, hemp or other sources is dissolved in alkali and carbon disulfide to make a solution called viscose, which is then extruded through a slit into a bath of dilute sulfuric acid and sodium sulfate to reconvert the viscose into cellulose. The film is then passed through several more baths, one to remove sulfur, one to bleach the film, and one to add glycerin to prevent the film from becoming brittle.
A similar process, using a hole (a spinneret) instead of a slit, is used to make a fibre called rayon. Chemically, cellophane, rayon and cellulose are polymers of glucose and contain the chemical elements carbon, hydrogen and oxygen."

Whereas PP:

http://en.wikipedia.org/wiki/Polypropylene

"Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications including packaging and labeling, textiles (e.g., ropes, thermal underwear and carpets), stationery, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, automotive components, and polymer banknotes. An addition polymer made from the monomer propylene, it is rugged and unusually resistant to many chemical solvents, bases and acids."

"Biaxially oriented polypropylene (BOPP)
When polypropylene film is extruded and stretched in both the machine direction and across machine direction it is called biaxially oriented polypropylene. Biaxial orientation increases strength and clarity.[12] BOPP is widely used as a packaging material for packaging products such as snack foods, fresh produce and confectionery. [13] It is easy to coat, print and laminate to give the required appearance and properties for use as a packaging material. This process is normally called converting. It is normally produced in large rolls which are slit on slitting machines into smaller rolls for use on packaging machines."

Or the more stable Mylar:

http://en.wikipedia.org/wiki/Mylar

"BoPET (Biaxially-oriented polyethylene terephthalate) is a polyester film made from stretched polyethylene terephthalate (PET) and is used for its high tensile strength, chemical and dimensional stability, transparency, reflectivity, gas and aroma barrier properties, and electrical insulation.
A variety of companies manufacture boPET and other polyester films under different brand names. In the UK and US, the most well-known trade names are Mylar, Melinex and Hostaphan."

Any of the wide range of polymers are safe for storage, in that they are all themselves inert. Even PVC, evil stuff that it is, is a problem due to the plasticisers in it. But the different properties of plastics need to be understood, since things like permeability, biodegradability, their reaction to heat and UV, etc affect their suitability for a given purpose. Which of course is why there are so many.

I would always use Mylar over Cellophane, though I'm fine with many of the other polymers as well, such as the LDPE coin bags the bank gives you for free.

[robbiegal]

not sure where you'd get myler bags
maybe the lighthouse ones that I have for my post cards are myler?

oh - and it looks like the bags I use are polypropylene
I buy the PR  ones - didn't realise that

[purplepennyhunter]

Yes the PR one's are what I use.

[Fulvio]

I've been reading up on bulk Mylar. Model aeroplane builders use it for wings since its super light and strong. People have posted they've managed to buy "offcuts" left over from production runs. Now to see if there are any aussie manufacturers to ring...

BTW, Mylar can be either heat or ultrasonic sealed. It melts @ 255°C, which can be done with an iron. There are even people using soldering irons to spot-weld around delicate stuff like papyrus scroll fragments.