Application Note
Adhesives & Fluids
New materials are constantly being formulated. Asymtek equipment is compatible with a wide variety of materials. Settings for materials from the following companies can be obtained upon request:
- Loctite
- Emerson & Cumming
- Hereaus
- Thermoset/Lord
Facts
Software:
- Placement accuracy +/- 50µ (microns) at 3 sigma (Wet dispensing accuracy using machine vision for placement)
- Speed up to 55,000 dots per hour/3mm grid
- Component size down to 0402
- CAD import software available.
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The accuracy data was obtained by dispensing and measuring
dots on a sample PCB. This is the same data obtained for the
SMA Applications and is currently one of the production tests
for all 600 systems to confirm the accuracy prior to shipment.
The information was obtained through the demonstration process
on various applications for customers. Materials reviewed
in this document include:
Dexter-Hysol
- FP4450
- FP4451
- EO-1062
- FP4323
- FP4400
- FP4401
- FP4402
- EO1016
Ablestik Labs
Hokuriku
Facts
- Fluidmove software can easily apply encapsulation materials.
Version 3.1C and above have enhanced programming capability
with built in circular and rectangular spiral fill patterns.
- The DV-06, DV-02 and DV-01 have successfully been used
to dispense the different encapsulation materials. The DV-06
has been selected for most applications.
- The abrasive nature of the encapsulation materials will
cause wear on the feedscrew of the DV-06. Continued exchanges
of the valve through Asymtek will be required. Frequency
of the exchange is dependent upon the production volume
with each customer.
- Dripless follower plungers for the syringes of material
are required to prevent drooling issues when the valve is
off.
- Typical dispensing velocities range from .75 IPS to 1.5
IPS.
- The needle heater is required to ensure consistent volumetric
dispensing and to ensure proper wetting action occurs during
the dispensing process.
- Heating the substrate is also recommended to ensure proper
wetting action occurs during the dispensing process.
- Absolute accuracy for dispense placement is + or - 0.005
inches at 3 sigma.
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The throughput information was obtained by performing demonstrations
for various customers as well as standard run tests. To identify
the materials used in these demonstrations, click on the Ablestick
Library text highlighted at the top of this window. The accuracy
data was obtained by dispensing and measuring dots on a sample
PCB. This is the same data obtained for the SMA Applications
and is currently one of the production tests for all 600 systems
to confirm the accuracy prior to shipment.
Facts:
Software
Fluidmove can achieve a dot rate of 18,000 dots per hour
with the following conditions:
- Dispensing time ONLY (No fiducials or conveyor)
- Spacing in the X and Y direction is 0.050 inches
- Z axis retract distance of 0.100 inches
- Only one dot size with a total time of 0.060 seconds
- Height sensing on each dot
- Fast dot option is enabled
- Program executed from DOWNLOAD
If the same program is executed while running from the computer,
the overall throughput will decrease to 16,000 dots per hour.
Typical application ranges of dispense time ONLY is in the
10 to 15,000 range on downloaded programs. If running from
the computer, this range decreases to 10 to 13,000 dots per
hour.
Fiducial times range for various applications:
4 to 6 seconds (Cognex will not make this go significantly
faster) Conveyor times range for various applications:
2 to 4 seconds IF the Pre-Que options is used. A DV-01 can
achieve the following ranges:
Dots 0.010" to 0.035" diameter Lines 0.020"
to 0.035" thickness A DV-06 can achieve the following
ranges:
Dots 0.025" and up diameter
Lines 0.035" and up thickness Absolute accuracy of the
dot placement is + or - 0.005 inches at 3 sigma. Minimum Needle
Size for the following materials are:
- Ablebond 84-1LMI 27GA
- Ablebond 84-1LMISR4 30GA
- Ablebond 84-1LMIT 25GA
- Ablebond 84-1LMIT1 25GA
- Ablebond 84-1LMIT2 25GA
- Ablebond 8700E 30GA
- Epotek H20E Premix 30GA
Opinions:
The debate resides around which valve is "best"
for silver epoxy. Both the DV-01 and DV-06 are successfully
dispensing consistent dots and lines of epoxy in production.
Some believe positive displacement is required to maintain
consistent dots; however, run tests with the DV-01 disprove
this theory. Others believe the DV-01 is better as the maintenance
and operating costs of the DV-01 are much lower than the DV-06.
AbleStick Library
Encapsulants
Heat Cure Adhesives
Silver Epoxies
- 36-2
- 8360
- 84-1LMISR4
- 84-1LMIT
- 8700-E
- 941-3
Surface Mount Adhesives
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The information was obtained through the demonstration process.
The fluids involved can be broken into to two categories:
RTV Silicone and Anaerobic Flange Sealants. RTV Silicones:
Loctite
- 5699 Ultra Gray Superflex
- Nuvasil Superflex Hi-Temp
- 598 Ultra Black FMD-310
General Electric
- N-SIL
- GE116 High Temp
- GE285-1772
- GE128
- GE108GE
- GE6808
- GE162
Dow Corning
- 734
- 732
- 738
- X36211
- 838
- 3140
Wacker
T-95
T-95F
Anaerobic:
Loctite
Facts
- Software:
Continuous path programming supported by all versions of
Fluidmove is required when performing an application of
this type. Fluidmove also provides different programming
options to neaten the start and end point of the gasket.
- Dispensing speeds usually do not exceed 3 IPS at 100 PSI
of fluid pressure. Throughput also depends on the fluid
delivery system. A pail pump system or a direct cartridge
mount to the valve will provide the fastest dispense times.
Remote cartridge feeding of the material will result in
increased dispensing times per part and reduce the overall
throughput.
- Cone tip needles or Semco nozzles will also increase the
flow rate of the material and reduce overall dispensing
times.
- Automove systems require Firmware revisions 3.0 or higher
to support the continuous path programming.
- The DV-03 is recommended for medium to high viscosity
Silicone RTVs.
- The DV-05A is recommended for low to medium viscosity
or self-leveling RTVs.
- The DV-08 is recommended for anaerobic flange sealants.
- The DV-06 can be used for precision gaskets using a silicone
RTV.
- Absolute accuracy for dispense placement is + or - 0.005
inches at 3 sigma.
Opinions:
Forward Tracking is a preferred method of mating the start point
to the end point without fluid peaking issues.
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