Tehcnical information

Grofit Plastic’s unique Bio-fresh Modified Atmosphere Packaging system (MAP) absorbs gases such as  Ethylene, Ammonia and Hydrogen Sulfide which are the main catalyst gases in the ripening process of fruits and  vegetables.As known, Ethylene emitted by vegetables is the main ripening catalyst. By controlling this gas we are able to slow down the ripening process. Increasing the shelf life of fresh produce is now as simple as packaging your produce in our

Bio-fresh packaging system.
 Our Bio-fresh packaging is excellent to use with fruits and vegetables affected by Ethylene gas such as: Apple - Apricot - Avocado - Banana - Broccoli - Brussel sprouts - Cabbage - Carrot - Cauliflower -Celery - Cucumber - Dill - Endive - Kiwifruit - Lettuce - Lime - Mango -  Melon - Papaya - Parsley - Passion fruit - Peach - Persimmon - Plum - Potato - Spinach - Tomato - Watercress - as well as freshly cut salads and flowers

 Our Bio-fresh packaging was developed together with fruit and vegetable growers to replace air freight transportation with ground or ocean transportation in order to save money. By using theBio-fresh system this option is feasible.

 
TECHNICAL DATA

Grofit Plastics Biofresh system has been carefully designed to balance  emitted  gases of  fruit and vegetables  during their ripening process. Accordingly, a great number of molecules having different properties can be absorbed on the Bio Fresh film surface.  In contrast to methods previously applied, we have succeeded in improving the Biofresh film absorption properties to a new higher level that  increases the shelf life of fresh produce after packaging, and during transportation and storage. Gases originating from the decomposition of organic matters are in particular:  ammonia, hydrogen sulfide, ethyl alcohol, ethyl-acetate. From the above mentioned vapors and gases, the results of measuring of ammonia and hydrogen sulfide will be detailed hereunder for representing purposes.

 AMMONIA ABSORPTION

Samples have been cut from a piece of our Bio Fresh film and dried in a heated exsiccator containing calcium-oxide (exposed surface 6 sq. dm,. 3 sq, dm.). Having reached mass stability, the recipient was filled with dry ammonia gas (industrial gas), using a flask. Weight of samples were measured every couple of hours. The results of measurements have been expressed in mg/sqm. and plotted against the duration of contact with dry ammonia gas. On the basis of correlation test processed by a computer a quadratic equation (transformed parabola) could be interpolated into dots with the least possible relative discrepancy. It is clearly shown that the quantity of fixed dry ammonia gas is growing for 6-7 days on the average up to 250 mg/sqm. and gradually decreasing to 50-60 mg/sqm. after that. (The reason for the decreasing is due to the damaging effect of the concentrated dry ammonia gas.)

 HYDROGEN-SULFIDE ABSORPTION

The experiment has been done similarly to the one with ammonia, but the gas has been generated in Kipp-Apparatus. Drying of the gas was impossible due to the fact that drying agents react with hydrogen sulfide. Measuring results expressed in mg/sqm. plotted against the duration of contact by gas The measuring points made a typical absorption curve. To calculate saturation limit we have ignored the slow starting period and fitted a hyperbole to further points. Taking the equations of these into consideration one can draw the conclusion that the degree of saturation of the tested film is very high, amounting to 2.200-2.300 mg/sqm.

 PERMEABILITY PROPERTIES FOR 50 MICRON FILM

TYPE	ASTM	VELU
OXYGEN	1434	340+/-320 cc/m2
CARBON-DIOXIDE	1434	20180 +/-2270 cc/m2
WATER VAPOR	-------	17.5 gr./m2