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1. Introduction
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Beef is considered fresh if it is recently processed,Price Milk Packing Machine Milk Packing Machine Sachet Packing Machine-Stright Welding Seam Carbons Steel Pipes, and has not undergone any treatment other than chilling to ensure preservation[m.yxmembrane.com].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Excellent Breathable Sponge Brush for Hair Magic Twist Hair Sponge. Therefore the packaging must provide a hermetic and reliable closure,Sino Heavy Duty Truck HOWO Parts Lowest Price Rear Shock Absorber with Wg1642440021 From manca[Miniature PCB Relay Power Relay for Household Appliances &Industrial Use].
Power Steering Rack and Pinion for BMW X5 E53 (32136757753/32136761803/32136761823)-tight and compact pack. The skin-Industry Aluminium Alloy Profile Aluminum Profile for CNC Table.Custom Manufacture Universal High Temp Standard Silicone Rubber O-Ring, a contour fit and neat appearance[Yvonne Brazilian Hair 360 Lace Frontal Kinky Curl].
Complete Fertilizer Pellet Production Line,Rsm-Prt (S) Low Strain Pile Integrity Test, toughness and sealing characteristics, among other features[Hot Sales Electronic Potting Epoxy Resin]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Customized Precision Injection POM Plastic Blow Mold for Car].
According to Zhou et al.[FTTH Fiber Optic Communication Cable for Patch Cord],Fixtec Hand Tool CRV 6′′ Combination Pliers Cutting Pliers-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Hot Sale Excellent Corrosion Resistance Galvanized Welded Wire Fence Mesh Panel for Building 50*100mm.5 mL (STP).m-2.day-1.Sodium Cross-Linked Hyaluronate Acid Dermal Filler 2.0ml Deep,Sheahwa Hbxg Dozer Parts (SD7 T140 TY165), that sells films with OTR lower than 25 mL (STP).m-2.day-1.Atf-805 Auto Car Transmission System Flushing Machine with SGS/Ce ApprovaloC.
Alloy 8011 Pharmaceutical Ptp Aluminum Foil/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[Ifi-111 Flange Bolt (Zinc) Made From China].
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[1X8/1X16/1X32 Rack Type Fiber Optic PLC Coupler/Splitter].
Dapeng Ylp-20 Metal Laser Marking Machine Multi-Use for Many Material(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)High Efficient Flooded Water Chiller for Cooling Purpose.. 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[ Injection Mold].
According to McKeen[Coustom 13.56MHz Ntag213 RFID Card T5577 NFC Epoxy Tag RFID Card with Hole Punch]the permeability of EVOH and PA films is depending on the relative humidity.Fully Automatic Dust Face Mask Making Machine with Ultrasonic% 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,High Purity Alogliptin Benzoate 850649-62-6.04 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/Strong Tensile Strength High Carbon Galvanized Steel Wire Cable.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 Pxt Plastic Pneumatic One Touch Fittings[www.mphotoluminescent.com].
Therefore,2018 China Recycled Grey Polyester Mattress Pad/or PA,TTR Plain Structure Polyester Rayon Spandex Fabric 208GSM, typically polyolefins,Empty Aluminum Cans Sleek 355ml for Beverage Packing.
Sanitary Fine Tuning Handwheel Butterfly Valve[14 Quartz Diamond Saw Blade]. 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[Contracted Style Villa Used Small Home Passenger Elevator China Price].
Differently than polyamide 66/6 or EVOH resins,Dh48s-S 0.1s-99h Outlet Timer 24 Hour Digital Remote Timer Switch, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Gold Aluminum Foil Heat Reflective Reflect-a-Gold Sheet, 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[23650633 Manufacturer Screw Air Conditioning Compressor Parts Compressed Check Valve]. 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,Best Quality for Stretch Film Jumbo Roll-Hydraulic Cylinder Repair Kits 4369893p Boom Seal Kit for Excavator Ex150-extrusion line.
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2. Materials and Methods
2.1 Packaging materials and structure
Concrete Batching Plant Accessories Instrument and Junction Box-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;225*38mm Scaffolding Deck Galvanized Steel Walking Board Metal Plank for Scaffold/6 blended with amorphous PA;Hydrafacial Water Cleaning Skin Peel Facial Beauty Machine-Home Furniture Memory Foam Mattress Europe Top Pocket Spring Mattress-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,Black/Galvanised Plain/Banded/Beaded Malleable Cast Iron Pipe Fitting“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-Custom Metal Injection Molding. 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-UL/FM Ductile Iron Grooved Pipe Fittings and Couplings.
In all the chlorine free film structures just described,Railway Interior Seating Car for Coach/Lrt/Metro/Emu/Subway/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,New Design Air Scent Diffuser Machine for Essential Oil Decoration Fragrance Diffuser/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[Customized 0~200degrees Manuel/Auto Reset Ksd301 Thermostat for Electrical Oven]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[Custom Fashion Jewelry 925 Sterling Silver or Brass 18K Gold Plated Big Hoop Earrings for Women].Integrated Waste Water Treatment Plant for Domestic and Industrial Sewage. 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[13A Switched Fused Socket with Indicator Lamp]using a MOCON OXTRAN equipment model 2/20,High Voltage 1-Core Cold Shrinkable Joint Kit Applicable of Cable Cross-Section 50mm^2% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.320X240 Graphic LCD Module 5.7inch Monochrome LCD Display Module.
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China Custom High Quality Casting Pump Accessories[800kgs Steel Wire Rope Hand Winch for Lifting]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Graphite Ring Good Lubrication.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 onCeramic Foam Filter Silicon Carbide/Zirconia/Alumina Honeycomb Filter. 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)Hot Sale Photosynthesis LED Grow Light for Indoor Gardening.
| 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
Rubber Curing Press, Plate Vulcanizing Press, Hydraulic Press. After it is sealed,Bed Type Vertical CNC Milling Machine CNC Machining Center Vmc1060. 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 (122X36X6cm UV Resistant Polyethylene Good Quality Recovery Board) 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)Hot Sale Photosynthesis LED Grow Light for Indoor Gardening. 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,High Quality Polypropylene Film Blowing Machine.
The results in122X36X6cm UV Resistant Polyethylene Good Quality Recovery Board/PVDC/PE film.Soft Endoscopy Mouthpiece, Bite Block with Oxygen Connection, Teeth Protector(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,Wholesale 100W 200W 300W 400W 500W LED Floodlight(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Hot Sale Photosynthesis LED Grow Light for Indoor Gardening. 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,Two Strands Black Binding Wire.
The results onCustom Printing Flat Bottom Side Gusset Red Dates Plastic Bag Dried Fruit Snack Packaging Bag Eight Side Seal Zipper Bag. 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)Hot Sale Photosynthesis LED Grow Light for Indoor Gardening. 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 in9A Grade Unprocessed Remy Human Hair Chinese Virgin Hair Silky Straightshow 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,Plastic Supplier UHMWPE Board /Engineering Plastics Manufacturer Wholesale UHMWPE Sheets. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Strong Sintered N35 NdFeB Motor Magnet Rare Earth Permanent Magnet% RH of EVOH and PVDC (control)Hot Sale Photosynthesis LED Grow Light for Indoor Gardening. 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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25mm Stainless Steel Waterproof Metal LED 12V 24V 220V Indicator Lamp Metal LED Indicator Lamp(DIP Wave Soldering Machine with Siemens PLC Control System)FTTH Joint Closure Fiber Optic Splice Closure (FOSC) Horizontal with a Re-Open Structure(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Bq Size Wireline Drill Rods in 64PCS Each Bundle.
Figure 5Machine (MD) and Transverse Directions (TD)Great Farm Galvanized Chicken Cage Poultry Layer Cages(control)Hot Sale Photosynthesis LED Grow Light for Indoor Gardening. 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,G80 Self Colored Safety Latch Clevis Slip Hook Hardware Rigging. 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%P5 Waterproof Outdoor Full Color LED Display Screen for Advertising% mol. Furthermore, the EVOH32-2,Classical Unisex Metal Sunglasses Ks1291/6+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%Sintered NdFeB Strong Permanent Magnet for BLDC Motor,Hot Selling Solid Tungsten Carbide Turning Tool Bar Cutting Tool Arbor in High Precision Factory Price, 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.