What techniques are used in mixing process to weigh or measure chemicals
use a simple patented “U-Tube" technique for measuring
vessels to set volume for each chemical for mixing. Once the volumes
are initially set, no recalibration is required since there are no
moving parts to wear over time in the measuring vessels. Our measuring
process is unlike other types of systems where frequent volume or
weight calibrations are required. We do not use pumps, scales, or
sensors to weigh or measure chemicals.
What is the Mixing Repeatability?
The repeatability of mixing with our “U-tube” technology
has achieved better results than any produced by industrial scales,
pumps, or sensors. The repeatability remains the same over time. There
are no moving parts in the measured vessels except for the adjustable
U-Tube.. The mixing repeatability can be easily maintained at or better
than 0.1 %.
What Mixing Ratios are the CFB, CFC, and CFCs capable of?
All systems have a mixing range up to 1000:1. These ratios can be
accomplished by the use of various volume vessels, still maintaining
small mixing ratios to avoid many problems that are seen when mixing
bulk quantities (i.e.; shelf-life, settling, separation, etc.).
How many number of chemicals can the ChemFlow blending and delivery
CFB: up to 3 chemicals
CFC: up to 3 chemicals
CFCs: up to 2 chemicals
We can also customize your blending needs.
What is so unique about ChemFlow’s patented measuring process?
No moving parts to wear, just the adjustable "U-Tube", and
that’s it! That’s why the measured repeatability can be
held indefinitely. Cycle to cycle, due to its small volumes, keeps
the system free from buildup.
How is thorough mixing accomplished?
For CMP slurry and other chemical applications, we use a Turbo Mixer,
ChemFlow Chem_Pulse mixer, or a static mixer (depending on model)
inside the tank for our blend/mixing systems. Mixed slurry or chemical
is continuously circulated thru the loop to make sure they are thoroughly
mixed. Since we keep the total working volume small, the complete
mixing is not a problem.
How does ChemFlow's blending/mixing systems get the chemicals necessary
for mixing and how are they controlled?
Chemicals come from a bulk or drum sources. The system’s PLC
is set up to open a valve or to start a pump (pneumatic) to allow
the fill for each vessel. The bulk supply that is not controlled by
our system would need to be at a positive flow to fill. It could fill
from a looped chemical supply line as well. In the case of the CFB
models, a large volume is necessary (55 gallon drum or bulk) for the
continued fill depending on the required total mixed supply. For the
CFC, a drum (5 or 55 gallon) or even the bottle transfer unit (CFF)
could be the source if the chemicals came in one-gallon bottles. As
you know there are many options, depending on your specific needs.
Our team can come up with a dependable solution.
Why is ChemFlow blending/mixing systems superior to other systems
in the market, particularly for CMP slurry and Etch chemicals?
What type of metrology is used on the blend/mixing systems?
systems are designed to let the end user integrate their preference
for metrology. There are many options for metrology such as pH meters,
particle counter, or other inline sample measurement systems. We could
incorporate these features but it could turn out to be a selection
that many end users would not prefer. We can build to customers specifications
How does one select a ChemFlow model to fill their needs?
Determine what type of chemical will be used.
Determine the chemical usage.
Determine whether chemical mixing is required or not, and the number
of chemicals to be mixed.
Determine if it requires constant circulation or not.
Contact us. We will do the rest for you.
Why are ChemFlow’s technologies better at controlling CMP slurry
particle settling and agglomeration?
the state-of-art system design, ChemFlow’s Blend and Delivery
Systems can eliminate particle settling in tanks and supply loops.
We use the "Pipe-Tank" design to prevent slurry particle
agglomeration and particle settling. We make small batches that are
frequent enough to eliminate the chances for slurry to settle in the
slurry supply loops.