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A time-saving method for sealing Purdue Improved Crop Storage (PICS) bags.

Kabita Kharel¹, Linda J Mason¹, Scott B Williams²

¹Department of Entomology, Purdue University, West Lafayette, IN, USA.

Journal of Stored Products Research

|June 15, 2018

Summary

A new fold-tied (FT) method for closing Purdue Improved Crop Storage (PICS) bags saves over 34% of sealing time compared to the conventional twist-tie (TT) method. This efficient PICS bag sealing method effectively suppresses insect populations by reducing oxygen levels.

Keywords:

Bag sealing Hermetic storage Maize storage PICS bags Sitophilus zeamais

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Area of Science:

Agricultural Science
Entomology
Postharvest Technology

Background:

Purdue Improved Crop Storage (PICS) bags are crucial for reducing postharvest grain losses on smallholder farms.
Conventional PICS bag closure using twist-ties (TT) is time-consuming and may compromise bag integrity.
Growing interest exists in large-scale PICS bag utilization by farmer groups and government agencies.

Purpose of the Study:

To evaluate the time efficiency of three novel PICS bag closure methods against the conventional twist-tie (TT) method.
To assess the impact of different closure methods on internal oxygen levels and insect suppression within PICS bags.
To identify an optimal PICS bag sealing technique for large-scale applications.

Main Methods:

Compared four PICS bag closure methods: conventional twist-tie (TT), inner liner rolled (IR), folded-tied (FT), and folded-separate (FS).
Measured the time required to seal 50 kg maize-filled PICS bags under partially and fully filled conditions.
Monitored internal oxygen levels and insect population dynamics (Sitophilus zeamais) in sealed bags.

Main Results:

The folded-tied (FT) method significantly reduced bag sealing time by over 34% compared to the conventional TT method.
Internal oxygen levels in PICS bags dropped below 2% within a week, effectively suppressing insect populations regardless of infestation level.
Oxygen depletion rates were consistent across all tested closure methods, indicating comparable hermetic sealing performance.

Conclusions:

The folded-tied (FT) method offers a substantial time-saving alternative for sealing PICS bags, particularly beneficial for large-scale operations.
All evaluated closure methods effectively reduce oxygen levels, leading to insect population suppression.
The FT method presents a practical and efficient solution for enhancing PICS bag usability in food security initiatives.