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Rapid freezer for Plasma on contact
KBF series : Test chambers for constant climatic conditions

KW in addition to the -40°C liquid bath freezer, proposes an alternative solution, satisfying however the technical advices and the normative in place, on the freezing time of the plasma bags. The adapted principal of thermal exchange, in this case, does not use a cold bath at - 40°C , but -75 /- 80 °C surfaces, with which the bags are in direct contact. The plasma bags, to be frozen, are immersed, vertically, in wells in which the walls are at least -75°C -80°C. The geometry of the wells is conical, to simplify extraction and formation of the solid bag, without any impediment for the increase in volume which happens when there is a passing in state from liquid to solid

Furthermore, the solution of the horizontal freezer maintains the following advantages:

TEMPERATURE UNIFORMITY minimum alteration of the internal T during the loading phase of the plasma bags seeing as the movement is minimal from the internal cold air, that tends to remain on the bottom of the wells guaranteeing good cooling- freezing during the bag contact-well walls.

VERTICAL FREEZING simplifi es the bag immersion seeing as the operator does not feel the intense coldness from the wells and no air bubble inside the bags, with minimum breakage risk of the bags; the shape of frozen bag is like a tile, so the following phase of storage is easier.

MINIMUM MAINTENANCE no ice formation in the area around the wells and in the retention gaskets, for minimum maintenance and an absolute guarantee of the maintenance of a constant T of -75 /- 80 °C.; no necessity of defrosting, possibility of continuous freezing.

MAX ERGONOMICS an handy load height eases the operator, without the introduction of any addition to a very low T and without contact with the cold air.

ENERGY SAVING minimum energy consumption in addition to the thermodynamic performance, thank to the high insulation and to the horizontal positions of the- 80°C wells.

PROCESS TRACEABILITY It's possible to equip the freezer with an electronic recorder and a bar code reader; the user can set a work schedule for single freezing batch, determining a) the single plasma units b) the operator c) the pulling down curve of T: All data are exportable whether in paper format or in digital format , which guarantee the full traceability of the freezing batch.

QUALITY OF FROZEN PLASMA the quality was evaluated through the values of concentration of fi brinogen, before and after freezing, and concentration of VIII factor post freezing. The recovery of 96% of fi brinogen and 81% of concentration of VIII factor post, are very good results.

STRUCTURE:
Internal case, made of 6 wells (in the KPFF24B model) and of 12 wells (in the KPFF48B model) in inox AISI 304 steel (AISI 316 on request) with BA polished fi nishing, with rounded corners for easy cleaning; the external structure is in glazed inox AISI 304 steel sheet; the insulation is in polyurethane CFC and HCFC free, expanded in situ, with density of 40 Kg./mc. and with a minimum mean width of 140 mm., including the door; the door is mounted on the hinges with ABS cover, auto balanced. Triple gasket (absolute retention guarantee against air entry) in silicon rubber with welded joints, warmed up by the refrigerant and of unlimited duration. The handle has a very ergonomic design and has a key lock. The freezer has pivoting wheels for easy transportation and internal movement in the laboratories. KW's guarantee on the steel parts of the structure is for life.
REFRIGERATON:
The refrigerant system is completely sealed up; it uses a cascade circuit, innovative in its components and in the fl uids to follow, together with, maximum reliability and maximum performance cooling; with 2 hermetic compressors (of more than 2 HP of power) silent (the Leq dB (A) value< 65; at more than 3 metres < 55), at high capacity refrigerant, having magnetic-thermal protection and of a manostat of maximum/minimum pressure on both circuits: total reliability and absence of failures 1st stage. The condensation surface of the 1st stage (air and thermal yield superior to 5000-10000 Watt, with environment T of about + 25° C), are very ample (with exchangers in tubeless execution) to overcome the most severe environmental and work conditions (functioning guarantee of environment T = +35°C); this is also for the second stage, with more exchangers, both air, and counter current, between the two fl uids in bi-phase conditions. MEDICAL DEVICE KW APPARECCHI