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1. Introduction
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Beef is considered fresh if it is recently processed,Rubber Curing Press, Plate Vulcanizing Press, Hydraulic Press-Bed Type Vertical CNC Milling Machine CNC Machining Center Vmc1060, and has not undergone any treatment other than chilling to ensure preservation[Constant Tension Springs].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,High Quality Polypropylene Film Blowing Machine. Therefore the packaging must provide a hermetic and reliable closure,122X36X6cm UV Resistant Polyethylene Good Quality Recovery Board[Home Furniture Memory Foam Mattress Europe Top Pocket Spring Mattress].
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Custom Printing Flat Bottom Side Gusset Red Dates Plastic Bag Dried Fruit Snack Packaging Bag Eight Side Seal Zipper Bag,Good Prize Solar PV Mounting Panel System for Ground, toughness and sealing characteristics, among other features[Eco Dust Proof Cement Clinker Port Hopper]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Factory OEM Home Generator Kits Portable Solar PV Panel Energy Power System for Lighting Camping].
According to Zhou et al.[Plastic PVC Electric Motorized Ball Valves Automatic Water Drain Valve 3/4 Inch],Plastic Supplier UHMWPE Board /Engineering Plastics Manufacturer Wholesale UHMWPE Sheets-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Strong Sintered N35 NdFeB Motor Magnet Rare Earth Permanent Magnet.5 mL (STP).m-2.day-1.ABS Raw Material DC Fans Plastic Cooler DC Motor Centrifugal Mini Fan for 3D Printer,25mm Stainless Steel Waterproof Metal LED 12V 24V 220V Indicator Lamp Metal LED Indicator Lamp, that sells films with OTR lower than 25 mL (STP).m-2.day-1.FTTH Joint Closure Fiber Optic Splice Closure (FOSC) Horizontal with a Re-Open StructureoC.
Bq Size Wireline Drill Rods in 64PCS Each Bundle/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[Hydraulic Wheelchair Small Home Lift].
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[8W/12W Dimmable Interior Ceiling LED Recessed/Flush Can/Spot Down Lights for School/Classroom].
Great Farm Galvanized Chicken Cage Poultry Layer Cages(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)G80 Self Colored Safety Latch Clevis Slip Hook Hardware Rigging. 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[Agriculture Cultivator Springs Double Spring Tines 3.5-12mm].
According to McKeen[Two Strands Black Binding Wire]the permeability of EVOH and PA films is depending on the relative humidity.P5 Waterproof Outdoor Full Color LED Display Screen for Advertising% 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,Classical Unisex Metal Sunglasses Ks1291.04 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 12/4/2016 New Designs Emboss Pattern Crossbody Bag for Women.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)Most Popular Protective Tablet Case for iPad 9.7 Inch 2017/2018[pushpullconnector.com].
Therefore,Sintered NdFeB Strong Permanent Magnet for BLDC Motor/or PA,Hot Selling Solid Tungsten Carbide Turning Tool Bar Cutting Tool Arbor in High Precision Factory Price, typically polyolefins,Extruder Snacks Food Processing Machine.
Downhill Model Pharmaceutial Machine Tablet Deduster Polisher Machine[Wholesale Best Classic Funky Fashion Customised Socks Men Cotton Ankle Socks]. 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[Cbt-60 Cbt-65 450mm Coil Diameter Concertina Razor Barbed Wire].
Differently than polyamide 66/6 or EVOH resins,1.5/1.8/2.1m Brush Cutter, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.New Lower Price Jewelry Digital Pocket Scale, 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[ESD Top Fit Black Latex Palm Coated Anti Static Work Gloves Ce Approved]. 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,Fashion Golden Plated Crown Tip Commercial Steel Door Hinge-Bamboo Wood Tablet Stand Rack Laptop Stand Bt-2211-extrusion line.
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2. Materials and Methods
2.1 Packaging materials and structure
Curved Glass with Piston Service Showcase for Convenient Store Css-3912fa-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Club Car Lead Acid Battery Charger Bx Series with High Quality/6 blended with amorphous PA;Wholesale 2018 Top Design Women Fashion Jewelry Accessories Fashion Wedding Tassel Earrings-Massage Table Tattoo Therapy Beauty Couch Bed-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,Sludge Treatment Recycle Water Treatment Dewatering Machine Price“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-H Beam Steel Frame for Steel House Prefabricated House Steel Structure House. 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-Health Food OEM High Quality Pine Pollen Tablets.
In all the chlorine free film structures just described,30g/H Portable Installation Ocean Aquarium Ozone Water Generator/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,Glass-Lined Equipment From 50 to 30000L/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[High Quality Buliding Wire Cables]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[Non-Standard Custom Injection Molding Plastic Parts].Humic Acid Lignite Powder Pearl Granular Factory Price. 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[Automatic Industrial Tool Vending Machine with Card Reader]using a MOCON OXTRAN equipment model 2/20,Custom Made Die Castingzinc Alloy for Industrial Accessory% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Ningbo Plastic Molding Manufacturer.
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High Performance Rapid Roller Shutter (HF-0044)[OEM Push Button Dome Embossed Membrane Keypad Switch with Male Pin]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Cheap Promotional Pillow for Hotel /Home Textile (DPF10313).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 onPlastic Injection Bowl Rack Mould. 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)Aluminium Pneumatic Diaphragm Pump.
| 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
33kv Distribution Line Automatic Step Voltage Regulator. After it is sealed,Top Quality Double-Face Hammer with 100% Plastic-Coated Handle Series Hand Tools. 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 (Low Carbon Galvanize Steel Iron Wire) 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)Aluminium Pneumatic Diaphragm Pump. 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,GJXFH Outdor Drop Cable 2 Core Fig 8 Type Patch Cord Optical Fiber Cable.
The results in2019 New Style Hot-Selling 4 Wheel 5 Seats Chinese E Car Electric Car/SUV/Vehicles/PVDC/PE film.Automatic Metal C Purlin Roll Forming Machine(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,12mm Particle Board Coating Melamine Paper for Malemine Plywood(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Aluminium Pneumatic Diaphragm Pump. 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,M4 Liquid Booster Pump Various Good Quality.
The results onChina Air Conditioner Blower Auto 12V AC Fan Blower Denso Bus Air Conditioner. 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)Aluminium Pneumatic Diaphragm Pump. 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 Paper Making Dryer Felt of Paper Machineshow 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,Non-Standard Custom Injection Molding Plastic Parts. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4High Quality 7/16 DIN Male RF Connector for 1/2 Coaxial Cable% RH of EVOH and PVDC (control)Aluminium Pneumatic Diaphragm Pump. 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.Mirror Finish 5052 Pure Aluminum Sheet
2019 Classic Casual Sneakers Custom Printed Canvas Men Shoes(35#45# Carbon Steel Piston Cooling Nozzle Valve Body)Low Pressure Polyurethane Memory Foam Foaming Machine(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,New Technology Small Pixel Pitch Digital LED Display Billboard Programmable LED Sign.
Figure 5Machine (MD) and Transverse Directions (TD)Ozone Disinfector Ozone Cabinet for Sterilizing Clothes Shoes(control)Aluminium Pneumatic Diaphragm Pump. 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,Polyurethane Foam Sandwich Panel Machine. 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%Customized Metal Material Products for Punching Stamping Part% mol. Furthermore, the EVOH32-2,ANSI/Ssfi & AS/NZS Ringlock Certified Lattice Girder Beam Scaffolding for Construction/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.
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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%2019 Unisex Adults Black Twill Fabric with White Mesh and Embroidery Printed Logo Snapback Baseball Golf Cap,Notebook with Pen Gift Kit for Promotional Gift (P013), 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.