SOLVE ALL YOUR HEATING AND COOLING PROBLEMS
REDUCE YOUR CYCLE TIME
REDUCE SCRAP
IMPROVE PARTY QUALITY
Where Isobars® Come From
Acrolab's Isobar® heat pipes have their roots in thermosyphons. Thermosyphons
function as a super-thermal conductor only in a vertical or near vertical plane. In a
thermosyphon, a small quantity of working fluid is placed in an evacuated tube. Heat is
applied to the base of the tube, causing the temperature of the working fluid to rise —
as this fluid heats, it vaporizes. This vapor then migrates to the colder end of the tube
where it is condensed. The condensate is returned to the heated tube end by gravity.
Since the latent heat of evaporation is large, considerable quantities of heat can be
transferred with a very small temperature difference from end to end. The
thermosyphon is limited in application because the evaporator region must be situated
lower than the condenser region.
How Isobars® Work
The Isobar® Heat Pipe improves on this in that it incorporates a sophisticated solidstate pump to return the condensate to the evaporator site. This pump takes the form
of a fine metallic wick that resides tight to the inner wall of the Isobar®. This wick,
through its capillary action, returns the working fluid to the evaporator without regard to
orientation. In a normal environment, the wick permits equal function in vertical and
horizontal planes. In applications where the evaporator site is above the condenser,
the performance of the Isobar® Heat Pipe is controlled by the capillary action of the
wick structure.
How Much Better Are They?
Isobar® Heat Pipes are super-thermal conductors and have the capacity to transfer
large amounts of heat at high speeds in both heating and cooling applications. In fact,
Isobar® Heat Pipes have, in some applications and orientations, a thermal conductivity
in excess of 20,000 times the rate of a solid copper bar of the same geometry.
How Isobars® Are Used
Acrolab Isobar® Heat pipes can be
used in a wide variety of applications.
Primarily they are used in injection
molding, die casting, and electronic
applications. They can take the place
of copper bars, bubblers, cascades,
or baffles. Isobars® transfer heat
rapidly into the cooling stream rather
then the coolant having to travel into
the heated area.
Acrolab Isobars® can also be used
to distribute heat to problem areas of
a tool.
Core Applications
Types Available
Acrolab engineers and customizes
Isobar® heat pipes to all different
shapes and sizes. Commonly used
Isobars® are: straight, baffled,
finned, and stepped. For these
types of Isobars®, temperatures can
range from 50°F to 550°F.
Acrolab can engineer Isobars®
that operate under 50°F. These
special Isobars® are application
dependent and are available upon
request.
BAFFLE:
For Thermoset Systems
Acrolab’s Thermoset Isobar®
System can be incorporated into
new or existing tool designs
solving cycle time, curing time,
and part quality issues.
Acrolab’s Isobar® heat pipes
are widely used in the thermoset
industry. Isobars® can bring
heat rapidly and accurately to
molding surfaces. This results in
increased productivity.
Acrolab supplies a full range
of engineering services for
thermoset tools from design, to
installation, to hands on
customer service. Acrolab
engineers will work closely with
you to achieve the optimal
thermal design for you
applications.
Acrolab’s Isobars® require
no upkeep, therefore
eliminating lengthy
maintenance downtimes.
Acrolab’s Isobars® will last
the length of the tool save you
time and money on
replacement parts.
ISOPLATENS
®
Acrolab’s Isoplaten® (“The Intuitive Platen”) redistributes the energy generated by
standard cartridge heaters to give molders rapid thermal recovery and unparalleled
and linear temperature distribution along the whole platen surface. Your tools
operate with reduced energy demands, produce better quality molded parts and
allow you to use faster curing compounds with narrower thermal processing
windows.
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•
•
•
•
•
•
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Uniformly Cure Parts Resulting In Better Quality
Reduce Cycle Time
Reduce Thermal Energy Required From Heaters
Energy Cost Savings
Save On Time
Evenly Heat Thermal Sensitive Parts
Eliminate Hot Spots
Reduce Scrap
Acrolab’s Isoplatens ® provide high levels of thermal stability to press platen
applications and can be designed for electric, oil, or steam heating. Integral water
cooling lines for fast process temperature changes are available . The standard
Isoplaten® is electronically heated and has an operating range of ambient to 500°F.
Acrolab engineered bi-level Isoplatens ® can hold a thermal uniformity of +/- 5°F
over 90% of the surface of the Isoplaten® . These results allow a substantial
improvement in cycle times, start up times, thermal recovery rates, and improved
part quality.
The Isoplaten’s® Unique thermal uniformity permits the use of one single zone
temperature controller for the entire platen. No special multi-zone controls, heaters,
or thermocouples are required.
CORE TECHNOLOGY
Acrolab offers innovative Isobar® core technology.
With Isobar® infiltrated cores you can heat or cool
parts in almost half the time as solid steel core pins.
With Acrolab Isobar® core technology cores are
heated or cooled more quickly and more uniformly.
Above Figure Shows Temperature
Uniformity Of Acrolab Isobar® Core pin
vs. Standard Solid Core pin.
Heating of Core Pins to Steady State
Isobar® vs. Solid Core Pin
200
Temperature (C)
175
150
With Isobars
125
Without Isobars
100
75
50
25
0
5
10
15
20
25
Time (Minutes)
30
35
40
ELECTRONIC
COOLING
Acrolab Engineers Electric
Cooling Systems
•Cooling Diagnostic Equipment
•Gas Analyzing Equipment
•Fluid Analyzing
Equipment
•Blood Warming
•Aircraft Cooling
•Water Purification
•Aircraft Engine Heating
•LED Cooling