| QUESTIONS |
ANSWERS |
| What
is the effect on the Pb SN alloy of processing tin lead dross at 300
DEG C in the EVS? |
Initial
research in the field has shown that the levels of impurities contained
within the Pb SN alloy processed through the EVS are the same or in
the case of some elements less than those in comparative samples in
the unprocessed alloy. Some preferential oxidisation of tin may occur.
This has been confirmed by initial research undertaken by the International
Tin Research Institute, London. |
| Does
the EVS remove copper from SNPB as found at high levels in hot air
levelling machine tanks? |
No,
not at this time. |
| Do
the internal temperatures create additional contaminants? |
No
See 1 above. Some undesirable elements such as iron are reduced in
the solder processed by the EVS. |
| What
is the maximum and minimum dross loads the SRS can process in one
cycle sequence? |
EVS3000
- 2kg/4lbs Minimum > 10kg/20lbs Maximum
EVS6000
- 2kg/4lbs Minimum > 20kg/44lbs Maximum |
| Can
I process dross from a bath that has an oil blanket? |
Not
advisable as you may experience some smoking during the cycle. On
advantage of using the EVS is that more frequent de-drossing can be
carried out without additional cost, thereby eliminating the need
for an oil blanket - another financial saving. The logic of using
a messy, time consuming process which limits the process options generated
by new technologies is questionable. |
| Can
I process dross that has been treated with dross reducing chemicals? |
For
dross reducing chemicals to be effective they should be stirred into
the dross. This can represent a significant cost whilst also representing
a process dilemma, i.e. once the chemicals are stirred into the dross
it can create an emulsion in the solder bath, the dross reducing chemical
would then be present in every solder joint on the PCB, and as such
this solution has been rejected by a major American computer manufacturer.
Regardless the dross can be processed although yields may be slightly
reduced. |
| What
is the power consumption of the EVS? |
2.3
KW maximum at start up, less once heating is achieved |
| What
precautions do I need to ensure my machine operator's safety? |
The
EVS is a safe machine to operate. Some basic precautions regarding
flow soldering heat and inhalation hazards need to be followed. A
full operator safety instruction section is contained in the operation
manual that accompanies every EVS and should be displayed by each
machine. Warnings are displayed on the machine. |
| What
extraction do I need? |
The
EVS has a standalone filtration system that requires no external ducting.
Alternatively you can connect to factory extraction. |
| Does
the EVS have any approvals and patents? |
Yes.
The EVS complies with EC requirements, BS5304 and is covered by national,
European an international patent applications and is CE certified |
| Can
the temperature of the EVS be varied? |
Yes,
the EVS is fully programmable via its password protected software |
| Does
the cycling process produce lead fumes? |
No,
as the temperature in the EVS is regulated to shut down should the
temperature reach 380C. |
| What
happens to the final dross deposit? |
In
some cases further cycling through the EVS may result in further solder
recovery. When dross appears spent of solder the dross can be sent
for treatment in the normal way, i.e. via your solder supplier. |
| Can
I use EVS to recycle dross from more than one wave soldering machine? |
Yes.
However it is important that dross is segregated from each individual
Machine cycled and the solder ingot returned to the original bath
otherwise cross contamination will be evident. On this basis (i.e.
multiple sites) it would be advantageous from a materials management
viewpoint to install a higher ratio of EVSĘs to wave soldering machines
thus preventing expensive cross contamination of solder baths. |
| Do
I need extra personnel to operate EVS? |
No. As EVS
is a self contained process permitting more rapid de-drossing without
penalty. Your operators time is then freed for other duties.
|
