Date

4-2009

Degree

Bachelor of Science in Agricultural Engineering

Major Course

Major in Agricultural and Bio-Process Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Yaptenco, Kevin F.

Committee Member

Arnold Elepaño, Edgardo Casas

Abstract

Polyethylene (PE) film samples with nominal thickness of 25, 40 and 50 um(PE25, Pe40 and PE50 respectively) were tested for oxygen and carbon dioxide transmission rates (O2TR and CO2TR respectively) using fabricated gas diffusion chamber under 5°C, 10°C and ambient temperatures. Oxygen and carbon dioxide concentrations for each chamber were monitored for 30 hours using the method described by Moyls et al. (moyls, I., Hocking, R., Beveridge, T. and timbers, G., 1992. Transactions of the ASAE 35 (4): July-August 1992). O2TR-C and CO2TR-C are highest in PE25 at ambient temperature (25.7°C ) having values of 13138 ± 2.1%mL/m² day respectively and lowest in PE50 at 5m² with values of 1907± 5% and 8027± 14.8%. In general, as film thickness decreased O2TR and CO2TR increased. ThePE samples followed Arhenius kinetics with activation energy highest in PE50 with 33089KJ/mol K and 30477KJ/mol K for O₂ respectively and lowest in PE25 with 23332 KJ/mol K and 22478KJ/mol K for O₂ and CO₂ respectively. The effect of perforation and the magnitude of its effect to the gas transmission rates for PE25, PE40 and PE50 at different temperatures were also determined. The addition of perforation to PE film increased the O2TR and CO2TR by 42134 to 56142 ml/m²day for )2TR and 22872 to 44664ml/m² day CO2TR. The diameter of the perforation was found to be too large (256um) rendering the effects of film thickness and temperatures to O2TR and CO2TR insignificant (R²=0.08 and 0.06 for )2TR and CO2TR respectively).

Language

English

Call Number

LG 993.5 2009 A2 M35

Document Type

Thesis

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