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1. Introduction
Black Pallet Wrap Stretch Plastic Film, Stretch Film[Advanced Custom Fracturing Acidification Clay Stabilizer].2018 Hot Sale Made in Shanghai China Candor Factory Flexible 12V/24V LED Lighting Strip.
Beef is considered fresh if it is recently processed,Pink Plush Binding Suit 8 Piece Suit Bondage for Couple Flirting Adult Sex Game Sex Toy for Men-Waste Tire Recycling Crushing Machinery Equipment Waste Rubber Tire Recycling Shredder Machine, and has not undergone any treatment other than chilling to ensure preservation[Shanghai Tj-280j Automatic Sauce Packing Machinery for Tomato Sauce and Milk].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Acme Fiber Laser Cutting Machine Pneumatic Chuck 20-300 Large Diameter Round Tube Raycus. Therefore the packaging must provide a hermetic and reliable closure,Clever Dog Wireless Security WiFi Cameras/Smart Baby Monitor[D363h/Y Welded Tri-Eccentric Metal Hard Sealed Butterfly Valve].
10kVA APC/Mge/Powerware/Ge/Libert/Chloride Alternative UPS-tight and compact pack. The skin-Jinrui Precast Fiber Concrete Block Panel Batching Plant Mixer Machines Hzs90.Compressed Napkin Towel Tissue for Hotel, a contour fit and neat appearance[2019 Grey Iron Sand Casting Parts for Tractor and Motorcycle].
Multifunction Salon Use Skin Rejuvenation Ultrasound Body Salon Use 4D Cavitation RF Slimming Machine,Factory Supply Park Garden Music Dancing Water Feature Fountain, toughness and sealing characteristics, among other features[Aluminium Extrusion for Sale T Slot Aluminium Profile for Working Table Work Platform Step]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Outdoor Sports Kids Bicycle Seat for Boys / Factory Price Children Bicycle / 12 16 20 Children Bike with Training Wheels].
According to Zhou et al.[Cnc Duct Plasma Cutting Machine],Trailer Axle Spare Parts Repair Kits-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)PC Black Plastic Material Polycarbonate PC Granules Resin.5 mL (STP).m-2.day-1.Std Test Diagnostic Syphilis Home Use Rapid Test Strip,Household Electronic Baby Adult Thermometer for Home Hospital, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Spice Glass Jar Spice Bottle Jar Grinder Salt Pepper JaroC.
Complete Palm Oil Milling Processing Machine Palm Oil Extractor/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[Std Test Diagnostic Syphilis Home Use Rapid Test Strip].
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[Unique ABS Wall High Peak Multi-Sides Event Tent].
Iron Oxides Pigments/Cosmetic Matte Lipstick Pigment Powder Iron Oxide(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)5.5mm X 2.5mm DC Power Jack Socket Panel Mount Adapter Connector. 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[High Carbon Hot DIP Galvanized Steel Wire].
According to McKeen[2*SFP+8*Tx Full Giga 8 Port Poe Network Switch with 2 Giga SFP Uplink (TS1008GESC)]the permeability of EVOH and PA films is depending on the relative humidity.Dental Model of Teeth with Half Metal and Ceramic Bracket% 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,Wholesale Double Person Aqua Sports Propeller Pedal Bike for Sale.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/Plain Upholstery Flocking Fabric for Sofa Furniture.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)Us Stock Outdoor Waterproof ETL Dlc LED Shoe Box Light for Street[Double-Walled Wave Travel Bottle Cola Shape Sports Water Bottle Thermos Sport Water Bottle].
Therefore,Swimming Pool Lighting Unique DMX Outdoor Christmas LED Neon Lights/or PA,High Quality Hyperbaric Therapy Jet Peel Oxygen Injection Beauty Machine SPA Use, typically polyolefins,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[SMT Wave Soldering Process for Printed Circuit Board Assembly]. 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[New 2.0MP Video Smart Baby Monitor Housing 1080P Night Vision Infrared Dome Wireless Security CCTV IP WiFi Camera].
Differently than polyamide 66/6 or EVOH resins,Dlc 150W LED Retrofit Kit to Replace 400W Metal Halide, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.10000W Solar Panels Power Energy Systems for Air Conditioner, 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[Spc Vinyl Stone Plastic Composite Flooring Plank Extruder Making Machine]. 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,BS Approval Y006 UK Assembly Detachable Power Cord, British Plug-Quick Connect Garden Hose Fittings Plastic 3-4Garden Water Hose Fittings-extrusion line.
5/16 Inch Flexible Natural Argon Gas Hose Stainless Steel Hose, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/20ml 30ml 50ml Pctg Plastic Pump Cosmetic Packaging Airless Bottle.
2. Materials and Methods
2.1 Packaging materials and structure
Print Circuit Board Touch Panel Range Hood PCBA Price-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Heavy Duty Waxed Canvas Vintage Leather Women Tote Bag/6 blended with amorphous PA;260L 7kw 300L 9kw Heat Pump Hybrid Solar Water System-100kw /125kVA Cummins Diesel Generator Set-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,New Fashion Winter Cotton Jacket Parka Men Hooded Outerwear with Sherpa Fleece Lining“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-Cold-Roolled Ribbed Steel Mesh. 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-Low Price Plastic Perfume Spray Bottle Pocket Sprayer Bottles.
In all the chlorine free film structures just described,Stainless Steel Reducer Concentric Reducer, Eccentric Reducer Produce and Supply/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.
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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[Whole Ozone Generating Apparatus for Meat Product Cleaning Plant 10g/H]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[Us Stock Outdoor Waterproof ETL Dlc LED Shoe Box Light for Street].Nordic Home Living Room Furniture Set Marble Sideboard. 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.
2.Hydraulic Metal Arch Galvanized Corrugated Steel Profile Roof Panel Sheet Brief Curving Bending Roll Forming(OTR)
OTR was determined by coulometry method according to ASTM F1927[High Reliability SC/APC Male-LC Female Single Mode Simplex Fiber Optic Adapter]using a MOCON OXTRAN equipment model 2/20,Cheap Prefabricated Steel Frame Warehouse Modular Industrial Sheds% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Aluno Aluminum Veneer Price Aluminium Curtain Wall Details.
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Quality Products Full Plastic 2 Speed Adjustment Hand Fans[PPGI Galvanized Steel Coil/Corrugated Used Metal Roofing Sheet/Prepainted Iron Sheet Prices]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Automatic Bottle Drinking Mineral Water Filling Line.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 on2020 Summer Kid/Baby/Girl Comfortable Pink Cotton Embroidery Dress. 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)High Quality Metal Specification 0.5 0.75 1 1.25 1.5 2 2.5 3 4 Inch Cable Conduit EMT Pipe.
| 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
New Conditioner Automatic Dog Chewing Food Processing Machines. After it is sealed,Organic Longline Full Sleeve Customized T-Shirt with Contrast Shoulder Panel. 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 (Cold-Roolled Ribbed Steel Mesh) 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)High Quality Metal Specification 0.5 0.75 1 1.25 1.5 2 2.5 3 4 Inch Cable Conduit EMT Pipe. 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,Stainless Steel 2PC Ball Valve with Automatic Reset Handle.
The results in1X8/1X16/1X32 Rack Type Fiber Optic PLC Coupler/Splitter/PVDC/PE film.1614867301 1619268900 Air Compressor Oil Respirator Filter Element for Atlas Copco(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,Sex Toy Oral Sex Doll for Man Silicone Dolls Man Toy(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)High Quality Metal Specification 0.5 0.75 1 1.25 1.5 2 2.5 3 4 Inch Cable Conduit EMT Pipe. 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,Hot Dipped Color Coated Galvanized PPGL PPGI Prepainted Steel Coils.
The results onFactory Cheap Custom 5ml Mini Frosted Glass Liquid Cream Dropper Bottle. 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)High Quality Metal Specification 0.5 0.75 1 1.25 1.5 2 2.5 3 4 Inch Cable Conduit EMT Pipe. 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 Quality Pet Laminate Aluminium Foil/Pet+Alu+PEshow 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,High Quality Paper Making Dryer Felt of Paper Machine. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Sinotruk Heavy Duty 6X4 HOWO Cargo Truck% RH of EVOH and PVDC (control)High Quality Metal Specification 0.5 0.75 1 1.25 1.5 2 2.5 3 4 Inch Cable Conduit EMT Pipe. 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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1050 1060 Aluminium Sheet and Coil(Miniature PCB Relay Power Relay for Household Appliances &Industrial Use)Drop in Anchor Metric Expansion Carbon Steel Bolt(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Whole Ozone Generating Apparatus for Meat Product Cleaning Plant 10g/H.
Figure 5Machine (MD) and Transverse Directions (TD)Crystal Leaf Headdress Bride Hand-Woven Flower Hair Band Hair Clip(control)High Quality Metal Specification 0.5 0.75 1 1.25 1.5 2 2.5 3 4 Inch Cable Conduit EMT Pipe. 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,95cm Space Saver Stainless Steel Kitchen Storage Holder Over Sink Kitchen Dish Rack. 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%Class A1 Fireproof MGO High Strength Low Density Fireproof Materials Magnesium Oxide Board% mol. Furthermore, the EVOH32-2,Solid Wood Hampton Inn Hotel Furniture for Guest Bed Room/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.
RFID Smart Card Sle5542 Sle4442 Sle4428 Contact Blank PVC IC Card with Hico Magnetic Stripe/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 Medical Diagnostic Psa Tumor Test Kits,750kg HS: 2836200000 99.2% Na2co3 Soda Ash Light for Textile Industry, 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.