You did not get many responses, probably because hardly anyone measures the
mesh tension at incoming inspection. The main reason for that is the lack of
space to make the measurement reliably. In most instances you have about 1
inch of mesh around the stencil and the most common tensiometers require
more space. You can not make this measurement on the foil itself, as even
without tension it hardly deforms when you place a tensiometer on it. (The
tensiometer has three in-line legs with the middle one being spring loaded.
The deflection of it with respect to the outer two provides an indicator of
the tension in the mesh.)
Ahne.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kane, Amol (349)
Sent: Thursday, May 13, 2010 06:07
To: [log in to unmask]
Subject: Re: [TN] stenicl tension per stencil thickness
How can you measure this tension on the finished product?....say, maybe as
part of receiving inspection?
Amol
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bill Kunkle
Sent: Thursday, May 13, 2010 8:37 AM
To: [log in to unmask]
Subject: Re: [TN] stenicl tension per stencil thickness
Geng Yu,
In general the stencil tension may only be measured in the support mesh
area.
Measurements on the foil will vary from stencil to stencil depending on the
foil thickness and different types of foil, as well as depending on the
tension in the support mesh.
Bill Kunkle
MET Assocs.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Geng Yu
Sent: Wednesday, May 12, 2010 10:28 PM
To: [log in to unmask]
Subject: [TN] stenicl tension per stencil thickness
Hi Technet team,
I'm SMT process engineer, now I encountered 1 question for stencil tension,
Can you do me a favor?
my company stencil tension standard is >=35N, but this standard was defined
at 5years ago,
At that time no stencil thickness is 3mils, now we used 3mils stencil, we
measured the stencil tension is lower than 35N, so I want to know if the
stencil tension is related the stencil foil thickness, and what is the
stencil tension standard per stencil thickness,
Thanks!
Best wishes
Geng Yu
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