Minutes
of meeting
Plyform,
Test Schedule:
Saturday,
11th September: Chemical
etching on 0.1 mm thick batch and then
bagging in vacuum tight bags; (
Monday, 13th September, morning: Tungsten tiles incoming in Plyform;
Monday,
13th September, afternoon: Primer
application and drying in a place that does not produce contamination;
Friday,
18th September: T-peel
test;
Monday, 20th
September: coupons
The
following numbers refer to the TART paragraphs
3.2
Deviation: visual inspection must be performed after chemical
etching, lying the tiles on tool and checking that
there are no deformations. All tiles that are not planar must be rejected.
The
tiles must be bagged vaccum-tight,
all operations must be performed with gloved hands using poliethilene/nitrile
powder free gloves. For the traceability of the process, the following requests
need to be satisfied:
for
the etching company:
·
Eventual work
instructions for the etching process traceability
·
Etching date
·
Bagging date
·
Shipping date
·
Batch number
·
Batch surface
roughness
·
Certificate of
conformance
for Plyform:
·
Date of arrival at
Plyform
·
Bag opening/primer
application date
·
Vacuum-tight
re-bagging date
3.2.4
In order to evaluate tile
cleanliness it has been decided to seal a single tile per batch in a
vacuum-tight bag, to be used for the water break test, this last performed in
Plyform with de-ionized water.
3.2.6
For
the T-peel test, two tiles per production lot, cut in 1’’ wide stripes as per
T-peel test already performed in Plyform, will be sealed in a vacuum-tight bag.
3.3
INFN must write the procedure
for the removal of sheen from Kapton.
In order to avoid possible distorsion of the Kapton following bake-out at 60°C, INFN
will comply to the following procedure:
·
Hating of Kapton to
60°C in climatic chamber;
·
Check of strip
distance;
·
Bake-out
temperature definition.
3.4
1) Poliethilene
cannot be
employed on Heavy and Mid tray type moulds, due to protusions
on tool.
2) There is a glue excess
problem between tiles after the first bonding. Therefore, as per Plyform
suggestion, excess glue on tiles and on interstices must be sanded to promote
grip of the second bonding. Two roads can be followed:
·
Leave the surface
as is, although Plyform know-how dictates sanding of interface.
·
Try to sand only
excess glue on interstices between tiles?
3.5
Plyform
will buy shortly a new bell jar dedicated to GLAST. Furthermore, the plates used for adhesive preparation must
be employed for GLAST only. Plyform agrees to the glue de-gassing procedure.
3.6
Plyform agreed to introduce the use of wires in their
bonding procedures. Such wires need not to be positioned beyond the tungsten
tiles in order to avoid any contact with the Kapton.
3.7
Transportation of production
into clean-room? Possibility
to use a portable clean room (Clean-TentÓ, www.moorfield.co.uk ). For the
tile-cleaning procedure, TexWipe 609 will be
employed.
3.7.2
T-peel will be built as per Plyform standard practice
(specimen cured at room
temperature for 24 hours), and without control over adhesive
thickness in order to be able to compare them with sandblasted ones.
Furthermore, 6 specimen will be built with the
following characteristics:
·
3 specimen cured
for 24 hours; (for reference);
·
3 specimen cured for 24 hours at room temperature and then
cured for another 24 hours at 40°C.
Finally, study of ASTM D2240-91 is mandated.
Eventually, procurement of material required by the above-mentioned standard is
mandated.
3.8
INFN
must define the MIPs
·
Tile conditions before usage;
·
Kapton conditions before bonding
·
Glue conditions before usage.