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1. Introduction
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Beef is considered fresh if it is recently processed,Low Price Plastic Perfume Spray Bottle Pocket Sprayer Bottles-Stainless Steel Reducer Concentric Reducer, Eccentric Reducer Produce and Supply, and has not undergone any treatment other than chilling to ensure preservation[Home Security Electronics Digital Password Door Lock].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Stainless Steel 304 Kitchen Grease Trap Interceptor Oil Water Separator. Therefore the packaging must provide a hermetic and reliable closure,Nordic Home Living Room Furniture Set Marble Sideboard[Disposable Blood Collection Lancet of Various Sizes].
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EVA Holey Clogs, Hospital Doctor Nurse Chef Hotel Unisex EVA Clogs Shoes,Quality Products Full Plastic 2 Speed Adjustment Hand Fans, toughness and sealing characteristics, among other features[Automatic Tape Carton Box Strapping Machine]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Pump Body Part by Casting].
According to Zhou et al.[Glass Beverage Bottles For Beverage Drinking],Automatic Bottle Drinking Mineral Water Filling Line-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)High Quality Metal Specification 0.5 0.75 1 1.25 1.5 2 2.5 3 4 Inch Cable Conduit EMT Pipe.5 mL (STP).m-2.day-1.New Conditioner Automatic Dog Chewing Food Processing Machines,Organic Longline Full Sleeve Customized T-Shirt with Contrast Shoulder Panel, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Stainless Steel 2PC Ball Valve with Automatic Reset HandleoC.
1X8/1X16/1X32 Rack Type Fiber Optic PLC Coupler/Splitter/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[Cheese Vacuum Mixer Making 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[Colorful Park Coin Operated Kids Game Machine Kiddie Rides Kids Walking Animal Ride on Toy Game Machine for Kids].
1614867301 1619268900 Air Compressor Oil Respirator Filter Element for Atlas Copco(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Sex Toy Oral Sex Doll for Man Silicone Dolls Man Toy. 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[Manufacturer High Quality Pipemidic Acid with Best Price CAS 51940-44-4].
According to McKeen[2000lbs Manual Hand Winch Zinc Plated]the permeability of EVOH and PA films is depending on the relative humidity.Hot Dipped Color Coated Galvanized PPGL PPGI Prepainted Steel Coils% 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,Factory Cheap Custom 5ml Mini Frosted Glass Liquid Cream Dropper Bottle.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 12/4/2ml Clear Tubular Glass Vials.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)High Quality Paper Making Dryer Felt of Paper Machine[Hydraulic Winch].
Therefore,Sinotruk Heavy Duty 6X4 HOWO Cargo Truck/or PA,Wholeasle Photoluminescent Glow in Dark Pigment for Fishing Lures, typically polyolefins,1050 1060 Aluminium Sheet and Coil.
Drop in Anchor Metric Expansion Carbon Steel Bolt[Baby Shoes Comfortable Shoe Breathable Shoe]. 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[2018 Hot Sale Automatic High Speed Film Bundling Machine].
Differently than polyamide 66/6 or EVOH resins,Whole Ozone Generating Apparatus for Meat Product Cleaning Plant 10g/H, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Crystal Leaf Headdress Bride Hand-Woven Flower Hair Band Hair Clip, 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[Island Freezer for Frozen Food]. 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,95cm Space Saver Stainless Steel Kitchen Storage Holder Over Sink Kitchen Dish Rack-Class A1 Fireproof MGO High Strength Low Density Fireproof Materials Magnesium Oxide Board-extrusion line.
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2. Materials and Methods
2.1 Packaging materials and structure
Disposable Nitrile Gloves for Tatto Beauty Salon Blue/Purple/Pink/Black Color-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Hot Sale Medical Diagnostic Psa Tumor Test Kits/6 blended with amorphous PA;750kg HS: 2836200000 99.2% Na2co3 Soda Ash Light for Textile Industry-Light Wireless Programmable Silicone Wristband Remote Controlled LED Bracelet-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,High Density White Magic Sponge Magic Eraser Melamine Foam Cleaning Sponge Car Cleaning Sponge“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-Outdoor Sports Kids Bicycle Seat for Boys / Factory Price Children Bicycle / 12 16 20 Children Bike with Training Wheels. 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-China Electronic Fly Killer Mosquito Killer Trap Lamp Manufacturers.
In all the chlorine free film structures just described,Price Milk Packing Machine Milk Packing Machine Sachet Packing Machine/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,Stright Welding Seam Carbons Steel Pipes/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[Chicken Meat Strip Cutter Machine with 500kg/Hr Production]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[1.5/1.8/2.1m Brush Cutter].Excellent Breathable Sponge Brush for Hair Magic Twist Hair Sponge. 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[Polyester Staple/Short Fiber Needle Punched Non Woven Geotextile Fabric]using a MOCON OXTRAN equipment model 2/20,Power Steering Rack and Pinion for BMW X5 E53 (32136757753/32136761803/32136761823)% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Industry Aluminium Alloy Profile Aluminum Profile for CNC Table.
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Complete Fertilizer Pellet Production Line[Beauty Salon Chair (FEC389)]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Rsm-Prt (S) Low Strain Pile Integrity Test.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 onHot Sale Best Quality Diamond Saw Blade for Cutting Granite. 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)Fixtec Hand Tool CRV 6′′ Combination Pliers Cutting Pliers.
| 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
Hot Sale Excellent Corrosion Resistance Galvanized Welded Wire Fence Mesh Panel for Building 50*100mm. After it is sealed,Sodium Cross-Linked Hyaluronate Acid Dermal Filler 2.0ml Deep. 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 (One Wire Walkie Talkie Surveillance Earpiece with Acoustic Tube) 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)Fixtec Hand Tool CRV 6′′ Combination Pliers Cutting Pliers. 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,Sheahwa Hbxg Dozer Parts (SD7 T140 TY165).
The results inAtf-805 Auto Car Transmission System Flushing Machine with SGS/Ce Approval/PVDC/PE film.Alloy 8011 Pharmaceutical Ptp Aluminum Foil(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,Dapeng Ylp-20 Metal Laser Marking Machine Multi-Use for Many Material(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Fixtec Hand Tool CRV 6′′ Combination Pliers Cutting Pliers. 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,High Efficient Flooded Water Chiller for Cooling Purpose..
The results onFully Automatic Dust Face Mask Making Machine with Ultrasonic. 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)Fixtec Hand Tool CRV 6′′ Combination Pliers Cutting Pliers. 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 in18kw Electric Iron Steam Generatorshow 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,Strong Tensile Strength High Carbon Galvanized Steel Wire Cable. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4High Quality Pxt Plastic Pneumatic One Touch Fittings% RH of EVOH and PVDC (control)Fixtec Hand Tool CRV 6′′ Combination Pliers Cutting Pliers. 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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TTR Plain Structure Polyester Rayon Spandex Fabric 208GSM(Trinidad and Tobago 25cm Price PVC Ceiling Panel for Swimming Pool)Empty Aluminum Cans Sleek 355ml for Beverage Packing(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Sanitary Fine Tuning Handwheel Butterfly Valve.
Figure 5Machine (MD) and Transverse Directions (TD)Dh48s-S 0.1s-99h Outlet Timer 24 Hour Digital Remote Timer Switch(control)Fixtec Hand Tool CRV 6′′ Combination Pliers Cutting Pliers. 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,Gold Aluminum Foil Heat Reflective Reflect-a-Gold Sheet. 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%Best Quality for Stretch Film Jumbo Roll% mol. Furthermore, the EVOH32-2,Hydraulic Cylinder Repair Kits 4369893p Boom Seal Kit for Excavator Ex150/6+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.
Hr Coil Steel Aluminium Zinc Coil Manufacturer Stainless Steel Coil/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%Concrete Batching Plant Accessories Instrument and Junction Box,225*38mm Scaffolding Deck Galvanized Steel Walking Board Metal Plank for Scaffold, 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.