Operation Of The CTM Varithane Mixing Head
The principle of the new 3 piston mixing head from CTM employs well-known impingement mixing principles via a grooved mixing piston and larger diameter-cleaning chamber, we combine them with a novel and new method of low output dosing control. An active UK patent covers the mixing head’s principle of operation. This first patent is being extended to include a number of regions globally. A second patent is also being pursued that covers a further mode of operation.
The Varithane mixing head is capable of dispensing a maximum of 100 grams per second in ‘continuous pouring’ mode, whilst also being able to achieve a minimum output of 4 grams per second in ‘multi shot’ mode at a ratio of up to 4:1. In addition the dispensing rate can be adjusted to any output in between on a shot to shot basis being fully controlled by the metering unit’s software program.
There is no requirement for altering injector pressure settings or high-pressure pump outputs between operating modes. Unlike other designs of low output mixing heads, mixing ratios of up to 4:1 do not limit the range of low output that is achievable from the Varithane mixing head. Dual hardness /dual density mixing via two mixing chambers is also possible.
The mixing head has several additional features; it is possible to apply considerable injection or dosing pressures at controlled rates without an adverse affect on the quality of component mixing. The mixing head can apply considerable pressure to the reacting mixture thus opening up many possibilities for controlled injection techniques.
A further benefit of the mixing head is the ability to vary output rate during the dispensing phase, this has particular value when producing automotive panel air filters. Over filling in the corners is easily corrected, in addition higher straight-line pouring speeds are possible.
|