Cannon JL, an industrial success!
The first year of industrial use for the new Cannon JL is acting like a pump for flushing and re-circulating a small
confirmed – and sometimes even exceeded – the quantity of lubricant oil, contained in a small spacer chamber
promised expectations. Manufacturers of domestic built behind it. The relatively small sliding surface of the rod
refrigerators, insulation panels, refrigerated displays and prevents the sticking of the surfaces and permits the use of a
cold stores obtained significant advantages in terms of slim cylinder so the size and weight of the mix head are
reduced consumption of chemicals, better foam quality, reduced, to be ergonomically handled also for manual
more regular distribution of densities within their operations.
products. The innovation continues now in the direction The first Cannon Jl head available on the market is the model
of a wider range of blowing agents and applications. JL 24/6, featuring a 200 mm long discharge duct, with an
internal diameter of 24 mm and a mixing chamber diameter
The Cannon JL is a new family of high pressure L-shaped of 6 mm. This head – whose total output ranges from 300 to
mix heads. The acronym JL means “Jet Less”: the mixing of 2000 cc/sec - initially works with two components but more
the two reactive liquids is not obtained by their impingement streams can be easily added. The wide range of output
through the action of two injectors but by the high handled by this head, where no jets need to be adjusted when
turbulence formed and maintained in a relatively narrow one significantly changes the output, imply that one size easily
mixing chamber. The liquid components are metered in a fits most of the conventional needs expressed by different The three hydraulic valves are rationally positioned and the pin adjustment
common chamber and then flow to the mixing chamber industries and applications – therefore, within reasonable device features a micrometric regulation.
trough variable restrictions where they acquire the necessary limits, there is no need for different heads to allow for the
energy. At the end of the mixing chamber an L-shaped production of different parts.
geometry deviates the flow into a much larger delivery The most interesting operating feature is its working pressure: foams, this firm has measured a standard reduction of 2
chamber, slows down its turbulence and permits the delivery from 70 to 210 bar, allowing for a simplification of the percentage points of specific density maintaining all the
of the mixed blend with a very laminar flow. dosing unit (pump type, filters, hoses, etc.). previous physical and mechanical properties. At a very high
annual consumption rate of chemicals, and considering their
high unit cost, even a marginal saving like this helped this
customer to pay back the investment in this new head in a
very short time.
An Italian producer of cold stores and walk-in coolers that
works with HFC 134a reported a much better planarity in its
panels, due to superior distribution of densities thanks to a
better foam quality. A reason for this can be the head's capacity
to “shoot” the liquid at a higher distance than that usually
obtained with a standard L-shaped head. This allows for a
more uniform geometrical distribution of the formulation
within the cavity, without the need for overpacking the foam
just to be sure that the whole panel will be filled.
Another Italian producer of refrigerated displays started
using it early in 2008 and has made until now nearly 70,000
injections: he reported significant improvements in filling
complex panels, reducing slightly the injected weight and
getting a finer cell structure, with improved insulation factor.
Advantages The mixing efficiency is obtained by speed and turbulence, not by pressure.
The new Cannon JL head delivers several advantages:
• a mixing method much more efficient than the traditional
How does it work? impingement: the higher efficiency has been computer-
The mixing of at least two fluids is normally performed studied and simulated, and confirmed by field tests
trough turbulence, which can be created with static mixers, • the mixing pressure can be reduced to 70-80 bar depending
dynamic mixers, high speed of the streams and jets, from the chemicals. This allows for the simplification of the
impingement of jets and streams. All of them try a different whole metering circuit (pump, filters, hoses etc)
way to maintain a high level of energy dissipation throughout • a wider range of flow rates can be handled by the same Rational design, few hoses, a long nose: the new JL is the fruit of 40+ years of
shear into the fluid. mixing chamber: the maximum output can be five times Cannon research in PUR mixing efficiency.
Cannon latest innovation in this field consists in generating higher than the minimum
high turbulence by decreasing the size of the mixing • it does not demands skilled operators to set the head's Industry success stories
chamber enough to generate a flow speed of tenth of meters injection conditions: an easy setting of the central needle These heads have been industrially tested with rigid and
per second and by using the front shape of the cylindrical suits a variety of flow rates; pre-positioning of different flexible foam for more than one year and with frequent shots
piston which seals the mixing chamber to create high shear values can be done manually or in automatic mode. (up to 60,000 in one month), with full satisfaction. Several
restrictions. This innovation produced the Jet Less head, a • a very long discharge duct (patented) can enter pouring European manufacturers of insulating panels, domestic
mixing head whose L-shape geometry permits as usual to holes very difficult to access, and guarantees a laminar flow refrigerators, cold stores and refrigerated displays are
reduce the turbulence of the flow exiting from the mixing even at high flow rates: perfectly suitable for discontinuous currently using it with full satisfaction.
chamber and to pour it in laminar form. insulation panel and for pipe-in-pipe insulation. • the use of the thin and long cleaning rod is mostly
An Eastern-Europe major supplier of domestic appreciated when using very sticky formulationsLong nose… but reliable!
refrigerators has already ordered a second head, after having • the internal geometry allows for a better handling of foams The JL features a long and wide discharge duct, whose main
successfully tested a first one for one year and hundreds of expanded with high-frothing blowing agents such as low-purposes are to dump the high speed and turbulence of the
thousand of shots - to be used for the production of large boiling Hydrocarbons, certain HFCs and natural liquid COstream, to perform a final mixing and to smooth down the 2
models characterised by a long filling path and difficult whirling of the stream. Leaving the head the stream becomes
internal design. Using Cyclopentane and Isobutane-blown laminar and can flow out into the mould with the ideal New models are now being prepared for future
behaviour. Its length enables to reach very deep injection applications, in addition to those mentioned before:
points. if you like the advantages, contact the nearest Cannon
The up and down movement of the self-cleaning rod office. A JL mixhead can bring you significant
opening and closing the discharge duct removes and pushes advantages and savings!
out the foam residuals still in the pouring chamber, stripping The distribution of foam in a refrigerator is improved since the liquid can be
out the reacted film from the walls. In the mean time the rod deposed at a longer distance from the injection hole and starts rising from a
central position of the cabinet.
The internal
geometry of the
new Cannon JL
mixing head counts
three mixing areas
with different
dimensions.
The main rod is
lubricated at every cycle.
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