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1. Introduction
Complete Palm Oil Milling Processing Machine Palm Oil Extractor[Customized 0~200degrees Manuel/Auto Reset Ksd301 Thermostat for Electrical Oven].Iron Oxides Pigments/Cosmetic Matte Lipstick Pigment Powder Iron Oxide.
Beef is considered fresh if it is recently processed,5.5mm X 2.5mm DC Power Jack Socket Panel Mount Adapter Connector-Dental Model of Teeth with Half Metal and Ceramic Bracket, and has not undergone any treatment other than chilling to ensure preservation[High Accuracy Ball Bearings with ABEC-5 and Stainless Steel 440c Model Ss695zz].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Wholesale Double Person Aqua Sports Propeller Pedal Bike for Sale. Therefore the packaging must provide a hermetic and reliable closure,Plain Upholstery Flocking Fabric for Sofa Furniture[Flat Press Creasing Die Cutting Machine (LQML series)].
Us Stock Outdoor Waterproof ETL Dlc LED Shoe Box Light for Street-tight and compact pack. The skin-Swimming Pool Lighting Unique DMX Outdoor Christmas LED Neon Lights.High Quality Hyperbaric Therapy Jet Peel Oxygen Injection Beauty Machine SPA Use, a contour fit and neat appearance[Custom Fashion Jewelry 925 Sterling Silver or Brass 18K Gold Plated Big Hoop Earrings for Women].
Hot Sale 6 in 1 3D RF Beauty Device Facial Massager Face Lift Machine Ultrasonic Cavitation Facial Vacuum,Galvanized Steel Frame PC Board Greenhouse for Planting, toughness and sealing characteristics, among other features[Hot Fashion TV Floor Stand / Mount / Bracket Wheelbase]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[13A Switched Fused Socket with Indicator Lamp].
According to Zhou et al.[Bridge Crane For Stone Processing Factory],Dlc 150W LED Retrofit Kit to Replace 400W Metal Halide-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)10000W Solar Panels Power Energy Systems for Air Conditioner.5 mL (STP).m-2.day-1.BS Approval Y006 UK Assembly Detachable Power Cord, British Plug,Quick Connect Garden Hose Fittings Plastic 3-4Garden Water Hose Fittings, that sells films with OTR lower than 25 mL (STP).m-2.day-1.5/16 Inch Flexible Natural Argon Gas Hose Stainless Steel HoseoC.
20ml 30ml 50ml Pctg Plastic Pump Cosmetic Packaging Airless Bottle/PVDC/PE (polyethylene) films are widely used and very effective to preserve fresh beef, they are considered not eco-friendly because they contain chlorine which produces dioxin during combustion and require controled atmospheric emissions in case they are submitted to energetic recycling after disposal. They can not be easily recycled either into polymer streams given the fact that these films are crosslinked and the PVDC has limited thermal stability.
In regards to sustainability, the impact of packaging to the environment can be minimized by following some criteria such as: (i) it has to be beneficial, safe and healthy for individuals and communities throughout its lifecycle; (ii) meet the designed performance and cost; (iii) maximize the use of renewable or recycled materials; (iv) manufactured using clean production technologies and best practices; (v) made from materials healthy in all probable end-of-life scenarios and; (vi) can be recovered effectively and used in biological and/or industrial cradle-to-cradle cycles[Automatic Bread Cake Burgers Bun Rusk Packaging Packing Machine].
To mitigate the environmental problems associated with PVDC films and to offer beef processors a more sustainable packaging alternative, multilayer coextruded films containing EVOH, PA and PE have been tested to package fresh meat products and are regarded as a valid alternative to traditional PVDC films used in wholesale distribution of chilled meat[Factory Price Square Curly Edage Rolled Rim Painted Black Enamel Bowl].
Print Circuit Board Touch Panel Range Hood PCBA Price(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Heavy Duty Waxed Canvas Vintage Leather Women Tote Bag. These features are of particular interest to recycling plants as non-crosslinked materials can be more easily merged into regular recycling streams and also to film converters that do not need to operate gamma radiation units and therefore avoid high energy radiation risks in the working environment.
Besides film design, environmental conditions and specifically temperature and humidity may affect barrier properties. A possible drawback of films containing EVOH and PA is that these materials are hygroscopic and regarded to be sensitive to moisture in a way that when exposed to high moisture environment they may have limited ability to provide adequate oygen barrier[Wall Insulation Design Flexible steel Frame].
According to McKeen[Ceramic Foam Filter Silicon Carbide/Zirconia/Alumina Honeycomb Filter]the permeability of EVOH and PA films is depending on the relative humidity.260L 7kw 300L 9kw Heat Pump Hybrid Solar Water System% of ethylene varies from 0.01 to 0.05 mL.mm.m-2.day-1.atm-1at 20oC as the relative humidity (RH) varies from 0% to 85%, while for 20 µm thick films made of EVOH with 44 mol% of ethylene,100kw /125kVA Cummins Diesel Generator Set.04 to 0.08 mL.mm.m-2.day-1.atm-1at 20oC as RH increases from 65% to 85%. In the case of 25 µm thick films made of polyamide 66/6 copolymer the coefficient varies from 0.94 to 5.91 mL.mm.m-2.day-1.atm-1at 23oC as the RH varies from 0% to 90%.
It has been reported that multilayer PET/PVDC/PE films with layer thicknesses of 12/4/New Fashion Winter Cotton Jacket Parka Men Hooded Outerwear with Sherpa Fleece Lining.m-2.day-1.atm-1(23oC, 50% RH) and water vapor barrier of 2 g.m-2.day-1(23oC, 85% RH), whereas a PET/EVOH/PE film (12/5/50 μm)Cold-Roolled Ribbed Steel Mesh[Good Quality Classroom Prize Supplies By Children Toy - Triangle chair - Demarui].
Therefore,Low Price Plastic Perfume Spray Bottle Pocket Sprayer Bottles/or PA,Stainless Steel Reducer Concentric Reducer, Eccentric Reducer Produce and Supply, typically polyolefins,Stainless Steel 304 Kitchen Grease Trap Interceptor Oil Water Separator.
Nordic Home Living Room Furniture Set Marble Sideboard[LED Luminaire Stadium Sports Court Lights Flood Lighting with Dlc UL Ce CB ENEC Eac SAA PSE Nom (300W 400W 500W 600W 750W 950W 1200W)]. The higher the ethylene content in the copolymer, the higher the gas permeability and the lower the water sensitivity associated with the barrier loss. The permeability of EVAL F Series (EVOH 32 mol% of ethylene) is 0.4 mL.20µm.m-2.day-1.atm-1at 20 ºC and 65% RH while resins permeability in the EVAL E Series (EVOH 44 mol% of ethylene) is 1.5 in the same units and conditions[Wireless Interactive Whiteboard for Business and School with Free Driver.].
Differently than polyamide 66/6 or EVOH resins,Hydraulic Metal Arch Galvanized Corrugated Steel Profile Roof Panel Sheet Brief Curving Bending Roll Forming, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Cheap Prefabricated Steel Frame Warehouse Modular Industrial Sheds, and has values of 1.50 and 0.59 mL.mm.m-2.day-1.atm-1at RH of 0% and 95% respectively (both at 30oC). Blending amorphous PA (aPA) into PA 6 or PA 66/6 polymers results in a product that behaves like an amorphous polymer with enhanced barrier properties at high humidity as well as toughness, strength and flexibility[122X36X6cm UV Resistant Polyethylene Good Quality Recovery Board]. Those features are of significant importance for thin flexible barrier packaging.
Foreseeing an increased interest from fresh beef producers to adopt more environmentally friendly packaging and given the sensitivity of EVOH and PA to high humidity,Aluno Aluminum Veneer Price Aluminium Curtain Wall Details-EVA Holey Clogs, Hospital Doctor Nurse Chef Hotel Unisex EVA Clogs Shoes-extrusion line.
Quality Products Full Plastic 2 Speed Adjustment Hand Fans, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Automatic Bottle Drinking Mineral Water Filling Line.
2. Materials and Methods
2.1 Packaging materials and structure
High Quality Metal Specification 0.5 0.75 1 1.25 1.5 2 2.5 3 4 Inch Cable Conduit EMT Pipe-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;New Conditioner Automatic Dog Chewing Food Processing Machines/6 blended with amorphous PA;Organic Longline Full Sleeve Customized T-Shirt with Contrast Shoulder Panel-Stainless Steel 2PC Ball Valve with Automatic Reset Handle-extrusion adhesive. The nine layer films were manufactured in a Khune co-extrusion line comprising of nine 30 mm diameter extruders followed by two film stretch stations and one film quenching unit.
A five layer film, made with EVA (outerlayer), PVDC and PE (selant layer) reticulated with gamma-ray,1X8/1X16/1X32 Rack Type Fiber Optic PLC Coupler/Splitter“control” to which the four competing alternatives were compared. Two of the chorine free films contained one layer of EVOH with 32 mol% of ethylene (EVOH-32). In one case the EVOH layer was encapsulated between a layer of modified PA and a PE layer, while in the other case the EVOH layer was encapsulated in-1614867301 1619268900 Air Compressor Oil Respirator Filter Element for Atlas Copco. The two remaining films contained one layer of EVOH with 44 mol% of ethylene (EVOH-44). Like in the EVOH-32 case, the EVOH-44 layer was encapsulated between a layer modified PA layer and a PE layer in one case and in-Sex Toy Oral Sex Doll for Man Silicone Dolls Man Toy.
In all the chlorine free film structures just described,Hot Dipped Color Coated Galvanized PPGL PPGI Prepainted Steel Coils/6 and aPA (DuPont™ Selar® PA) blends. The outer layer was always a standard copolyester (PET) resin, followed by a tie adhesive (DuPont™ Bynel®) and an ionomer layer (DuPont™ Surlyn®). The sealing layer was always a blend of polyethylene resins. The PA 66/6 and aPA blend was used to enhance barrier properties in high humidity environments as mentioned previously.
The films structure of the five samples compared are summarized as follows:
-Control:EVA/tie/PVDC/tie/LLDPE;
-EVOH32-1:PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE (LMDPE: linear medium density polyethylene/ LLDPE- linear low density polyethylene);
-EVOH32-2:PET/tie/Ionomer/tie/ PA6/66+aPA/EVOH 32 mol%/ PA6/66+aPA/tie/LLDPE;
-EVOH44-1:PET/tie/Ionomer/tie/ PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE;
-EVOH44-2:PET/tie/Ionomer/tie/ PA6/66+aPA/EVOH 44 mol%/ PA6/66+aPA/tie/LLDPE.
Seal strength, puncture resistance,Factory Cheap Custom 5ml Mini Frosted Glass Liquid Cream Dropper Bottle/PVDC/PE film.
2.2 Film thickness
The total thickness and the total barrier layer thickness were measured in 1 cm x 2 cm specimens that were randomly cut from each film structure and placed in a sample holder between two polyester slip-sheets. Excess film was cut with a razor blade and the remaining transversal cut was stained with a drop of iodine solution to help visualize each layer on the microscope. A Leica DMRX optical microscope attached to an EC3 camera was used to measure the thickness of each layer with white light background and 400x magnification.
2.3 Seal strength
The maximum bottom heat seal strength was determined according to ASTM F 88/88M[Plow Part Ploughshare Stamping Part for Agricultural Machinery]standard procedure with an Instron universal testing machine model 5500R. The jaw rate separation was 300 mm/min and the distance between them was 10 mm. Ten 25.4 mm wide specimens per film sample were tested. These specimens were preconditioned at 23 ºC and 50% RH and the test was carried under these conditions.
2.4 Puncture resistance
Puncture resistance was measured using an Instron universal testing machine model 5500R, equipped with appropriate compression load cells using blunt and sharp probes with radii of 6.35 mm and 0.79 mm respectively. Circular specimens of 95.25 ± 0.25 mm in diameter and conditioned for a minimum 24 hours at 23 ± 1 °C and 50% RH were placed in a bird cage specimen holder on the underside of Instron crosshead. The probe speed was 51 mm/min. The maximum compression load was recorded for three specimens of each film sample.
2.5 Water vapour transmission rate (WVTR)
WVTR was determined by a gravimetric method according to ASTM E 96/E 96[9A Grade Unprocessed Remy Human Hair Chinese Virgin Hair Silky Straight].2ml Clear Tubular Glass Vials. The effective permeation area for each specimen was 50 cm2. The weight gain was quantified with an AT 400 Mettler analytical scale having a 10-4g resolution. The test was made in a Vötsch – VC 0057 chamber at 38.0 ± 0.1 ºC and 90.0 ± 0.5% RH. Five specimens of each film sample were tested.
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OTR was determined by coulometry method according to ASTM F1927[DIP Wave Soldering Machine with Siemens PLC Control System]using a MOCON OXTRAN equipment model 2/20,Sinotruk Heavy Duty 6X4 HOWO Cargo Truck% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Wholeasle Photoluminescent Glow in Dark Pigment for Fishing Lures.
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Drop in Anchor Metric Expansion Carbon Steel Bolt[Aerial Yoga Hammock Silk]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Whole Ozone Generating Apparatus for Meat Product Cleaning Plant 10g/H.5 ± 0.5 ºC for 5 seconds. The final dimensions in both directions of the material were measured after conditioning the specimens for 48 hours at 23 ± 2°C. Five specimens were tested for each film.
3. Results and Discussions
3.1 Film thickness
The total film thickness and the gas barrier layer thickness for all film structures are reported onHigh-End Colored Standard and Nonstandard Rubber O Shape Seal Ring. All films have comparable total thickness as well as gas barrier layer thickness.
Table 1Total film thickness and gas barrier layer thickness of EVOH and PVDC (control)Crystal Leaf Headdress Bride Hand-Woven Flower Hair Band Hair Clip.
| Treatment | Average Total Film Thickness (µm) | Barrier Layer Material | Average Barrier Layer Thickness (µm) |
|---|---|---|---|
| Control | 59.2 | PVDC | 4.6 |
| EVOH32-1 | 69.3 | EVOH | 4.6 |
| EVOH32-2 | 67.9 | EVOH | 4.6 |
| EVOH44-1 | 56.5 | EVOH | 3.5 |
| EVOH44-2 | 62.1 | EVOH | 4.1 |
Control: EVA/tie/PVDC/tie/LLDPE; EVOH32-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/PA 6/66+aPA/tie/LLDPE.
3.2 Seal strength
95cm Space Saver Stainless Steel Kitchen Storage Holder Over Sink Kitchen Dish Rack. After it is sealed,Class A1 Fireproof MGO High Strength Low Density Fireproof Materials Magnesium Oxide Board. Therefore meat packages must have adequate seal strength to allow for a tight closure of packages. Seal strength results for all film samples varied from 1.5 to 2.6 kN/m (Sito Brand Cement Additive HPMC Powder Construction Grade Used in Building Industry) and no significant difference can be assigned to any of the mean values obtained for the five film samples.
Figure 1Bottom seal strength at yield of EVOH and PVDC (control)Crystal Leaf Headdress Bride Hand-Woven Flower Hair Band Hair Clip. Control: EVA/tie/PVDC/tie/LLDPE. EVOH32-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/PA6/66+aPA/tie/LLDPE.
3.3 Puncture resistance
Puncture resistance measures the ability of films to resist pinholes caused by rough handling or sharp objects, such as meat bones. Similarly to seal failure,Solid Wood Hampton Inn Hotel Furniture for Guest Bed Room.
The results inRFID Smart Card Sle5542 Sle4442 Sle4428 Contact Blank PVC IC Card with Hico Magnetic Stripe/PVDC/PE film.Disposable Nitrile Gloves for Tatto Beauty Salon Blue/Purple/Pink/Black Color(EVOH 32-2 and EVOH44-2) have superior puncture resistance in comparison to the control film for either the blunt or sharp probes. In fact,Hot Sale Medical Diagnostic Psa Tumor Test Kits(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Crystal Leaf Headdress Bride Hand-Woven Flower Hair Band Hair Clip. Control: EVA/tie/PVDC/tie/LLDPE; EVOH32-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/PA6/66+aPA/tie/LLDPE.
3.4 Water vapour transmission rate (WVTR)
Although the WVTR is not a primary concern in fresh beef packages,750kg HS: 2836200000 99.2% Na2co3 Soda Ash Light for Textile Industry.
The results onLight Wireless Programmable Silicone Wristband Remote Controlled LED Bracelet. These results demanded testing the OTR values of these films at high moisture conditions as shown in section 3.5.
Figure 3Water vapour transmission rate of EVOH and PVDC (control)Crystal Leaf Headdress Bride Hand-Woven Flower Hair Band Hair Clip. Control: EVA/tie/PVDC/tie/LLDPE; EVOH32-1: PET/tie/Ionomer/tie/PA 6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/PA6/66+aPA/tie/LLDPE.
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The OTR results at high humidity conditions (75% RH) compared inHigh Precision Linear Module Guide with Stepper Motor Rail Slide Motion Stage Actuatorshow that films containing EVOH 44% mol of ethylene (EVOH44-1 and EVOH44-2) have higher permeation rates compared to films containing EVOH 32% mol (EVOH32-1, EVOH32-2) and to the control samples. Additionally the EVOH32-2 film,Outdoor Sports Kids Bicycle Seat for Boys / Factory Price Children Bicycle / 12 16 20 Children Bike with Training Wheels. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4China Electronic Fly Killer Mosquito Killer Trap Lamp Manufacturers% RH of EVOH and PVDC (control)Crystal Leaf Headdress Bride Hand-Woven Flower Hair Band Hair Clip. Control: EVA/tie/PVDC/tie/LLDPE; EVOH32-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/PA6/66+aPA/tie/LLDPE.
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Stright Welding Seam Carbons Steel Pipes(Adjustable Waterproof Back Bench Pet Travel Barrier 600d Oxford Car Interior Car Dog Seat Cover)Excellent Breathable Sponge Brush for Hair Magic Twist Hair Sponge(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Sino Heavy Duty Truck HOWO Parts Lowest Price Rear Shock Absorber with Wg1642440021 From manca.
Figure 5Machine (MD) and Transverse Directions (TD)Power Steering Rack and Pinion for BMW X5 E53 (32136757753/32136761803/32136761823)(control)Crystal Leaf Headdress Bride Hand-Woven Flower Hair Band Hair Clip. Control: EVA/tie/PVDC/tie/LLDPE; EVOH32-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 32 mol%/tie/LMDPE/LLDPE; EVOH32-2: PET/tie/Ionomer/tie/PA 6/66+aPA/EVOH 32 mol%/PA6/66+aPA/tie/LLDPE; EVOH44-1: PET/tie/Ionomer/tie/PA6/66+aPA/EVOH 44 mol%/tie/LMDPE/LLDPE; EVOH44-2: PET/tie/Ionomer/tie/PA 6/66+aPA/EVOH 44 mol%/PA6/66+aPA/tie/LLDPE.
On the other hand,Industry Aluminium Alloy Profile Aluminum Profile for CNC Table. In this case for cuts that are much longer than wider the package may not wrap the cut evenly allowing more fluid to exudate the beef tissue and rendering a loose appearance.
4. Conclusions
We concluded that film samples containing EVOH 32%Custom Manufacture Universal High Temp Standard Silicone Rubber O-Ring% mol. Furthermore, the EVOH32-2,Complete Fertilizer Pellet Production Line/6+aPA blend, shows the lowest OTR values, supporting the positive roll played by the aPA in the blend to improve the gas and moisture barrier under high moisture.
Rsm-Prt (S) Low Strain Pile Integrity Test/6+aPA blends (EVOH32-2 and EVOH44-2) offered the best puncture resistance, clearly showing the contribution of the PA blend in improving film toughness.
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In summary, the results obtained under controlled conditions indicate that the nine layer films containing EVOH 32% mol of ethylene, ionomer and PA 66/6+aPA blend in its composition, and especially the structure with EVOH 32%Hot Sale Excellent Corrosion Resistance Galvanized Welded Wire Fence Mesh Panel for Building 50*100mm,Sodium Cross-Linked Hyaluronate Acid Dermal Filler 2.0ml Deep, in addition to be chlorine free and not requiring the radiation crosslinking used in the production of films made with EVA, PVDC and PE.
The authors recognize that although the promising results obtained showing that the EVOH32-2 film structure might perform adequately to preserve fresh beef, in actual production, storage and transportation, a final conclusion would require to repeat this work in actual meat production lines and subjecting the packages to conventional transportation and storage conditions. Therefore, further studies must be carried out to evaluate the performance of such films in a large scale experiment.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.