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Re: Adhesive and tyvek



Pete--
Concerning Wisdom Adhevsive R172DT--who carries it?  Thanks!
Susan Lightcap


At 07:18 AM 3/5/99 -0500, you wrote:
>Subject: Adhesive and tyvek
>
>>That recent thread re: tyvek inspired me to cut a mailing envelope apart
>>to do a little experimenting. I didn't get far when I found that PVA
>>doesn't adhere it to paper. I was able to peel the tyvek right off the
>>paper sheet after the PVA had dried.
>
>     The terms "Tyvek"  and "PVA" represent not single products but families
>of products.  When different parties are discussing their unique experiences
>regarding these particular products chances are that apples are being
compared
>to oranges unless the references are specific as to the type of tyvek or the
>specific brand and product description of the PVA used.
>
>   Tyvek comes in basic flavors,  Types 14 and 16 seem to be manufactured as
>cloth substitutes and are used in disposable work clothes and the like.  When
>I ordered "Tyvek" (with no further specifics) from Gaylord several year back
>this is what I received (not what I wanted).  The type 16 is perforated, I
>suppose, to make it more breathable. Type 10 is manufactured as a paper
>substitute and is used in envelopes and the like.  All three types come in a
>variety of thicknesses and finishes.  My guess is that when tyvek is
processed
>into a finished product, like envelopes, it acquires different
characteristics
>because it has often been printed on and, in some cases, seems to have been
>coated, possibly to increase water resistance.    Unfortunately, the agents
>you buy your tyvek from do not alway have the type and product number
>available  (Gaylord for example).  Where you buy your tyvek probably
>determines what you receive.  If you buy from a paper supplier (like Alling
>and Cory) you most likely will end up with type 10.
>
>   That said, I use a 6 mil Type 10 (25" x 38" sheets)  for my bookbinding
>needs.  This seems to be a stock item with the paper distributors I have
dealt
>with.  I don't believe there is much use for the Types 14 and 16 in
>bookbinding as they tend to delaminate fairly easily under stress.
>
>   Once you select the proper tyvek you still have to select the right glue.
>The term PVA describes a family of glues that vary greatly in actual working
>properties and adhesive properties.   What each of these glues have in common
>is that the manufacturer starts with basic PVA .  From this initial starting
>point anything can happen as plasticizers, tackifiers and a wide variety of
>other compounds are added in varying quantities and blends to produce very
>different glues, all described as PVAs.  Chances are excellent that there is
>the right PVA for most any task, but there is probably also the wrong PVA for
>many tasks.    The right PVA is not only determined by the substrates to be
>glued but the types of stress the glue joint will be subjected to.
>
>   Buying the right PVA and comparing notes on what two people believe is the
>same PVA is further complicated when you buy your PVA from a third party
>distributor (like Gaylord, Bro Dart, University Products...) who put their
own
>labels on the glue they sell.  The PVA you buy in one year may not be the
same
>PVA you buy the next year as these distributors may change manufacturers and
>formulations without changing the product name.  The solution would be to
>encourage these distributors to sell their PVAs under the manufacturer's name
>and product number rather than as re-labeled, heaven-knows-where-it-came-from
>products.   Purchasing an appropriate PVA has been further complicated by our
>own profession which insists on references such and "acid free,"  "pH
neutral"
> and "reversible" when shopping for a PVA.  These are all useful references
>but have nothing to do with the actual working qualites of the PVA in
>question.  These working qualities range from how easy is it to work (are we
>brushing it, rolling it, applying it with a glue machine) to how well does it
>work with different materials.  Does the application require a stiff film or
>an elastic film?  Does it require a thin film or a thick film?  An so on.
>
>     I return to the basic question.  I glue my type 10 tyvek with Wisdom
>Adhesive's R172DT.  This is a relatively spreadable, highly elastic PVA that
>seems to work well with difficult substrates such as tyvek.
>
>    My apologies for rambling.  The original query hit one of my hot
>buttons.
>
>                                                         Pete Jermann
>
>
>Pete Jermann
>Preservation Officer/Bookbinder
>Friedsam Memorial Library
>St. Bonaventure University
>St. Bonaventure, NY 14778
>Tel. (716) 375-2324
>


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