G-HF Self Verifying Cocoon™

Gas Ultra-Hermetic Fumigation

GrainPro Self Verifying Cocoons™ is designed for toxic-free fumigation and safe storage of agricultural commodities. G-HF Self Verifying Cocoons™ are either standard size or custom-made to enclose stacks of boxed, crated, or bagged produce. G-HF Self Verifying Cocoons™ use a specially-developed durable and flexible plastic liner that has low permeability to oxygen (O2), carbon dioxide (CO2), and moisture.

The Fumigation Principle:
The commodity is loaded into gastight G-HF Self Verifying Cocoons™ of flexible PVC for treatment. Once the Cocoon is closed with the special gastight zipper, CO2 is flushed into the Cocoon. Insertion of the gas will take place at a bottom gas inlet, whereas a top outlet enables the release of the lighter O2. The amount of CO2 inserted should reach a concentration of 90% (leaving only 2% O2). This initial concentration will kill all living insects, larvae and eggs within an exposure time of a maximum of 10 days, and as little as two days, depending on temperature, commodity and target insect species.

As a rule, CO2 is much more effective at higher temperatures than at lower temperatures. The concentration of the CO2 can be easily determined with a portable GrainPro O2 analyzer or with a CO2 analyzer.

This technology fits most situations where methyl bromide and/or phosphine are excluded from use as fumigants for environmental, insect resistance, or health-food reasons.

The Storage Principle
All the agricultural products or their derivatives targeted for this storage system have prolonged shelf life due to their maintenance of a constant moisture content in the ultra hermetic environment. In contrast, under conventional storage conditions, they are all susceptible to damage and quality deterioration by stored product insects and fungi including mycotoxin.

Furthermore, many of the products are subject to changes due to oxidation during storage, having an adverse effect on color, taste or nutritive value. In contrast, storage under modified atmospheres whereby the oxygen in the air surrounding the commodity is replaced by either carbon dioxide or nitrogen, prevents the development of insects, growth of fungi and oxidation processes within the commodity.

The System
This method of applying modified atmosphere is termed the “flush and maintenance method”. The system is provided with inlet and outlet ports at the bottom and top respectively enabling the module to be flushed from the bottom with carbon dioxide or nitrogen from tank or cylinders while the air is expelled from the top. Additional equipment that may be provided is a continuously operating CO2 monitor that measures concentrations of CO2 within the module; when the level rises above a pre-set limit, the controller activates a solenoid valve connected to a gas cylinder that injects gas into the module, thereby maintaining the desired low oxygen concentration.This method of applying modified atmosphere is termed the “flush and maintenance method”. The system is provided with inlet and outlet ports at the bottom and top respectively enabling the module to be flushed from the bottom with carbon dioxide or nitrogen from tank or cylinders while the air is expelled from the top. Additional equipment that may be provided is a continuously operating CO2 monitor that measures concentrations of CO2 within the module; when the level rises above a pre-set limit, the controller activates a solenoid valve connected to a gas cylinder that injects gas into the module, thereby maintaining the desired low oxygen concentration.

 

 


In order to be effective, treatment has to take place at temperatures of at least 25° C.

THE ADVANTAGES
Advantages of storage under modified atmospheres are:

• Moisture level of the commodity remains constant.

• The commodity is not subjected to periodic toxic insecticidal treatments during storage to control pests.

• Meets requirements for the organic food market.

• The produce can be stored at ambient temperature instead of alternative energy-consuming cold storage methods where sub zero temperatures are required to prevent insect infestations and biochemical deterioration.

• Installation demands little infrastructure.

• Assembly can be finished in a few hours.

• Cost-effective than other forms of storage.

• Stored commodities remain high quality.

• Complete turnkey projects, including design, construction, and operation.

 

POTENTIAL COMMODITIES AND APPLICATIONS:

• Dried fruits (raisins, prunes, apples, mangoes, dates, figs, bananas)

• All varieties of nuts

• Organic grains and beans

• Coffee and cacao beans

• Tobacco leaves

• Dried vegetables and herbs (chilli, garlic)

• Dried fish

• Dried flowers

• Museum, library, and antiques fumigation

 

PRODUCT SPECIFICATIONS

MATERIAL SPECIFICATIONS DETAILS
Material Flexible Polyvinyl Chloride (PVC)
Color White
Thickness, mm 0.83
Material weight, g/m2 1050 
Oxygen Transmission Rate (OTR), cm3/m2/day 500 max
Water Vapor Transmission Rate (WVTR), g/m2/day 8 ± 1
 
SIZES
SVC CAPACITY (MT)* LENGTH (m) WIDTH (m) HEIGHT (m) VOLUME (m3)
GP G-HF Cocoon - 005 5 3.00 1.65 1.50 7.50
GP G-HF Cocoon - 010 10 3.30 3.00 1.50 15.00
GP G-HF Cocoon - 020 20 4.50 3.30 2.00 30.00
GP G-HF Cocoon - 2-050 50 8.70 4.50 2.00 78.32
GP G-HF Cocoon - 3-050 50 6.00 4.35 3.00 78.30
GP G-HF Cocoon - 100 100 8.60 5.80 3.00 150.00
GP G-HF Cocoon - 3-150 150 8.90 8.50 3.00 227.00
GP G-HF Cocoon - 4.5-150 150 7.50 6.80 4.50 230.00
GP G-HF Cocoon - 300 300 9.26 7.45 6.00 414.00
GP G-HF Cocoon - 320 320 13.00 11.00 6.00 858.00
 
INDICATORS
PARAMETERS HUMIDITY INDICATOR OXYGEN INDICATOR
Size 20mm 15mm
Indication RH = 65% O2 level = 3%
Color RH < 65%: Brown O2 level < 3%: Pink
RH > 65%: Green O2 level > 3%: Blue
Activation Time 20 minutes
Shelf Life 6 months
* Results based on testing with rice and maize at high infestation rate
* Results based on rice, maize and wheat
* Quantity based on wheat

Product Gallery


CERTIFICATE


Storage and Transport Products have been Certified for Organic Use


 

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