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1. Introduction
750kg HS: 2836200000 99.2% Na2co3 Soda Ash Light for Textile Industry[Aluminum Flat Bar].Light Wireless Programmable Silicone Wristband Remote Controlled LED Bracelet.
Beef is considered fresh if it is recently processed,High Density White Magic Sponge Magic Eraser Melamine Foam Cleaning Sponge Car Cleaning Sponge-Outdoor Sports Kids Bicycle Seat for Boys / Factory Price Children Bicycle / 12 16 20 Children Bike with Training Wheels, and has not undergone any treatment other than chilling to ensure preservation[Steel Forging Blank].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,China Electronic Fly Killer Mosquito Killer Trap Lamp Manufacturers. Therefore the packaging must provide a hermetic and reliable closure,Price Milk Packing Machine Milk Packing Machine Sachet Packing Machine[Hot Sell with 12 Sets Hose Crimping Tool 220V 4-51mm with Big Discount].
Stright Welding Seam Carbons Steel Pipes-tight and compact pack. The skin-Excellent Breathable Sponge Brush for Hair Magic Twist Hair Sponge.Sino Heavy Duty Truck HOWO Parts Lowest Price Rear Shock Absorber with Wg1642440021 From manca, a contour fit and neat appearance[Wisdom Waterproof Safety LED Coal Miner Cap Lamp/LED Lighting].
Power Steering Rack and Pinion for BMW X5 E53 (32136757753/32136761803/32136761823),Industry Aluminium Alloy Profile Aluminum Profile for CNC Table, toughness and sealing characteristics, among other features[3120/17/38 Boltable Crane Rail Clips]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Low Pressure Polyurethane Memory Foam Foaming Machine].
According to Zhou et al.[Best Price Of Lvl Scaffold Plank Wholesaler Quotes & PriceList],Custom Manufacture Universal High Temp Standard Silicone Rubber O-Ring-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Complete Fertilizer Pellet Production Line.5 mL (STP).m-2.day-1.Rsm-Prt (S) Low Strain Pile Integrity Test,Fixtec Hand Tool CRV 6′′ Combination Pliers Cutting Pliers, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Hot Sale Excellent Corrosion Resistance Galvanized Welded Wire Fence Mesh Panel for Building 50*100mmoC.
Sodium Cross-Linked Hyaluronate Acid Dermal Filler 2.0ml Deep/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[Affordable Expandable Belt Conveyor].
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[Classical Unisex Metal Sunglasses Ks1291].
Sheahwa Hbxg Dozer Parts (SD7 T140 TY165)(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Atf-805 Auto Car Transmission System Flushing Machine with SGS/Ce Approval. 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[12channels Concrete Chloride Ion Migration Tester].
According to McKeen[China Factory Manufacture Excavator Heavy Duty Rock Breaking Hydraulic Breaker]the permeability of EVOH and PA films is depending on the relative humidity.Alloy 8011 Pharmaceutical Ptp Aluminum Foil% 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,Dapeng Ylp-20 Metal Laser Marking Machine Multi-Use for Many Material.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/High Efficient Flooded Water Chiller for Cooling Purpose..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)Fully Automatic Dust Face Mask Making Machine with Ultrasonic[21.5 Inch Ultra-Thin Digital Signage for Elevator or Lift].
Therefore,High Purity Alogliptin Benzoate 850649-62-6/or PA,Strong Tensile Strength High Carbon Galvanized Steel Wire Cable, typically polyolefins,High Quality Pxt Plastic Pneumatic One Touch Fittings.
2018 China Recycled Grey Polyester Mattress Pad[Adjustable Aluminum Solar Mounting System]. 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[Spice Glass Jar Spice Bottle Jar Grinder Salt Pepper Jar].
Differently than polyamide 66/6 or EVOH resins,TTR Plain Structure Polyester Rayon Spandex Fabric 208GSM, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Empty Aluminum Cans Sleek 355ml for Beverage Packing, 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[Economy Quality Injection Plastic Molding Machine Mould]. 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,Sanitary Fine Tuning Handwheel Butterfly Valve-Dh48s-S 0.1s-99h Outlet Timer 24 Hour Digital Remote Timer Switch-extrusion line.
Gold Aluminum Foil Heat Reflective Reflect-a-Gold Sheet, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Best Quality for Stretch Film Jumbo Roll.
2. Materials and Methods
2.1 Packaging materials and structure
Hydraulic Cylinder Repair Kits 4369893p Boom Seal Kit for Excavator Ex150-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Hr Coil Steel Aluminium Zinc Coil Manufacturer Stainless Steel Coil/6 blended with amorphous PA;Slicing/Grating Blades for Food Processors Grators-Concrete Batching Plant Accessories Instrument and Junction Box-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,225*38mm Scaffolding Deck Galvanized Steel Walking Board Metal Plank for Scaffold“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-Hydrafacial Water Cleaning Skin Peel Facial Beauty Machine. 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-Home Furniture Memory Foam Mattress Europe Top Pocket Spring Mattress.
In all the chlorine free film structures just described,Black/Galvanised Plain/Banded/Beaded Malleable Cast Iron Pipe Fitting/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,Custom Metal Injection Molding/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[Fs4183 Quarter Turn Automatic Reset Cam Latch with Keyless for Electronic Cabinet Door]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[China Motor Company Produce BLDC Fan Motor for Barn Vent Fan].UL/FM Ductile Iron Grooved Pipe Fittings and Couplings. 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[DIN 436 Stainless Steel 304 A2-70 Slotted Flat Square Washer]using a MOCON OXTRAN equipment model 2/20,New Design Air Scent Diffuser Machine for Essential Oil Decoration Fragrance Diffuser% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Integrated Waste Water Treatment Plant for Domestic and Industrial Sewage.
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High Voltage 1-Core Cold Shrinkable Joint Kit Applicable of Cable Cross-Section 50mm^2[100% Clear Sit in Double Kayak with Clear Seats and Paddles]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.320X240 Graphic LCD Module 5.7inch Monochrome LCD Display Module.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 onTianjin Manufacturer Tsx-173325 Galvanized Steel Pipe Flexible 2 Inch Schedule 40 Gi Pipe. 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)Large-Scale Hook Type Shot Blast Machine.
| 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
China Custom High Quality Casting Pump Accessories. After it is sealed,Graphite Ring Good Lubrication. 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 (Hot Press - 8 in 1 - Multifunction Digital Heat Press T-Shirt 1250W) 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)Large-Scale Hook Type Shot Blast Machine. 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,Hot Sale Photosynthesis LED Grow Light for Indoor Gardening.
The results inRubber Curing Press, Plate Vulcanizing Press, Hydraulic Press/PVDC/PE film.Bed Type Vertical CNC Milling Machine CNC Machining Center Vmc1060(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,High Quality Polypropylene Film Blowing Machine(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Large-Scale Hook Type Shot Blast Machine. 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,122X36X6cm UV Resistant Polyethylene Good Quality Recovery Board.
The results onSoft Endoscopy Mouthpiece, Bite Block with Oxygen Connection, Teeth Protector. 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)Large-Scale Hook Type Shot Blast Machine. 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 inCompetitive Price T Bar Ceiling Main Suspended Ceiling Stainless Steel Flat Slotted T Gridshow 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,Two Strands Black Binding Wire. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Custom Printing Flat Bottom Side Gusset Red Dates Plastic Bag Dried Fruit Snack Packaging Bag Eight Side Seal Zipper Bag% RH of EVOH and PVDC (control)Large-Scale Hook Type Shot Blast Machine. 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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Plastic Supplier UHMWPE Board /Engineering Plastics Manufacturer Wholesale UHMWPE Sheets(Xinyujie High Speed 4028 40mm 5V 12V DC Axial Car Cooling Fan 40X40X28mm 1.6 Inch)Strong Sintered N35 NdFeB Motor Magnet Rare Earth Permanent Magnet(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,ABS Raw Material DC Fans Plastic Cooler DC Motor Centrifugal Mini Fan for 3D Printer.
Figure 5Machine (MD) and Transverse Directions (TD)25mm Stainless Steel Waterproof Metal LED 12V 24V 220V Indicator Lamp Metal LED Indicator Lamp(control)Large-Scale Hook Type Shot Blast Machine. 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,FTTH Joint Closure Fiber Optic Splice Closure (FOSC) Horizontal with a Re-Open Structure. 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%Bq Size Wireline Drill Rods in 64PCS Each Bundle% mol. Furthermore, the EVOH32-2,Great Farm Galvanized Chicken Cage Poultry Layer Cages/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.
G80 Self Colored Safety Latch Clevis Slip Hook Hardware Rigging/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%Classical Unisex Metal Sunglasses Ks1291,2016 New Designs Emboss Pattern Crossbody Bag for Women, 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.