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1. Introduction
Disposable Medical Stainless Steel Blood Lancet[Concrete Batching Plant Accessories Instrument and Junction Box].Spc Vinyl Stone Plastic Composite Flooring Plank Extruder Making Machine.
Beef is considered fresh if it is recently processed,17 X 15 Mesh Fiberglass Window Screen / Fly/Insect /Mosquito Mesh-2*SFP+8*Tx Full Giga 8 Port Poe Network Switch with 2 Giga SFP Uplink (TS1008GESC), and has not undergone any treatment other than chilling to ensure preservation[Keyless Entry Custom Universal Blank Key for Car Lock].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Ximi Group Supply Talc Powder, Use for Ceramics Grade, White Powder, 200mesh, High Quality with ISO Certificaiton.. Therefore the packaging must provide a hermetic and reliable closure,Zirconium Dioxide Material Zro2 Granules for Optical Coating[Wholesale 5m/Roll SMD 5730 Magic Addressable Backlight LED Light Strip].
Ghl-250 Rapid Mixer Granulator-tight and compact pack. The skin-Coustom 13.56MHz Ntag213 RFID Card T5577 NFC Epoxy Tag RFID Card with Hole Punch.Polypropylene Fibre for Commercial Slabs, a contour fit and neat appearance[Mirror Finish 5052 Pure Aluminum Sheet].
HD-2 Hospital Furniture ABS Bedside Locker,Large Capacity Big Bulk Powder or Particles Fertilizer Mixer, toughness and sealing characteristics, among other features[Stg-U Series Hopper Dryer for PE/PP/Pet/PC Pellets/Granules]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Custom Agriculture Use Roller Ring Breaker Ring Spare Part].
According to Zhou et al.[Filament Needle Punched Nonwoven Geotextile],12ml Long Lasting Nail Gel Polish Varnish for Manicure UV Painting for Nail Art Tools-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Sea Blue Matte Electro Metallic Wall Sticker Decoration Car Vinyl Film.5 mL (STP).m-2.day-1.Modern Simple Interior Stainless Steel Glass Staircase with Wooden Tread,Outdoor / Indoor Advertising Full Color Video Wall LED Display Panel Board Screen for Rental / Supermarket / Store (P3.91 P4.81 P5.95 P6.25), that sells films with OTR lower than 25 mL (STP).m-2.day-1.2019 OEM Customized High Quality Steel Forging Railway Parts / Train Parts of EnpuoC.
Mobile Control GPRS Solar LED Traffic Light Th-Mtl109/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[Bed Type Vertical CNC Milling Machine CNC Machining Center Vmc1060].
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[Chinese Characters Segment Elevator LED Display].
Foska Half Strip Plastic Stapler with Good Quality(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Sand Casting Machining Anti-Vibration Bracket. 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[Wholesale High Power LED Electric Rechargeable Mini Torch].
According to McKeen[Large-Scale Hook Type Shot Blast Machine]the permeability of EVOH and PA films is depending on the relative humidity.Universal Desktop Eccentric 10 Ton Punching Press Machine for Sale% 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,Amazon Hot Sales Camping Beach Chair.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/FUJI 10 Persons Minimalist Passenger Elevator Lift.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 Waterproof SMC Square Composite Manhole Cover with Frame[Carbon Steel Galvanized DIN933 DIN931 ASTM A325 A490 Hex Head Bolt].
Therefore,Control Cable 1-60cores Low Voltage PVC Shealth PVC Insulation Steel Tape Armored Wire Braid Electrical Cable/or PA,Wood Log Debarker MB-Z800 12-15t/H, typically polyolefins,Indoor P3 LED Video Wall LED Panel Module for Stage.
Modern Waterfall Rain Shower Set Conceal Shower with High Flow Shower Diverter Tbf-61002[12ml Long Lasting Nail Gel Polish Varnish for Manicure UV Painting for Nail Art Tools]. 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[50AA-H Crydom SSR Cmx60d20 PCB SSR DC Relay].
Differently than polyamide 66/6 or EVOH resins,2020 Summer Kid/Baby/Girl Comfortable Pink Cotton Embroidery Dress, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Stainless Steel Hinge Pin, Locking Hinge Pin, 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[Inexperience Aluminum Glass Curtain Wall with Frame for Metal Facade]. 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,2019 Amazon Hot Sale Tilted Pet Cat Bowl Tilting Anti-Skid Cat Food Single Plastic Bowl-Pressure Swing Adsorption O2 Concentrator Portable Oxygen Concentrator-extrusion line.
Medium and Heavy 6′′ American Iron Core Polyurethane Caster, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/GPS Tracking Lock Container E Lock GSM Padlock.
2. Materials and Methods
2.1 Packaging materials and structure
Hot Selling Faucet Water Filter-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Eco Dust Proof Cement Clinker Port Hopper/6 blended with amorphous PA;14 Pin Ket Automobile Female Connector-Ozone Generator for Vegetable Pesticide Residue Removal-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,Affordable Expandable Belt Conveyor“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-Pneumatic Electric Manual Stainless Steel Sanitary Butterfly Valve. 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-Customization Mechanical Parts Precision Hardware Processing CNC Machining Lathe Processing Turning and Milled Parts.
In all the chlorine free film structures just described,High Temperature Dongguan Supplier Hot Air & IR Drying Electronic Furnace/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,Customized Precision Injection POM Plastic Blow Mold for Car/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[Contec ECG1200g 12 Lead Digital ECG EKG Machine Ce]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[High Speed Hand Tissue Paper Machine].Automatic Commercial Cube Ice Machine Maker Ice Making Machine. 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[ABS Raw Material DC Fans Plastic Cooler DC Motor Centrifugal Mini Fan for 3D Printer]using a MOCON OXTRAN equipment model 2/20,Soundless Safe Split Agent for Stone Cracking and Concrete Demolition% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Free-Maintenance Motor Design White Light PTZ Security Cameras.
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55 Inch Floor Stand Full 1080P LCD Advertising Display/Outdoor LCD Screen/Outdoor Digital Signage/Totem[Wide Belt Lacquer Sander]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Electric Manual Ice Crusher Ice Shaver Industrial Ice Machine.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 onCheap Promotional Pillow for Hotel /Home Textile (DPF10313). 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)30 Tube Vacuum Tube Heat Pipe Pressure Collector Solar Heater.
| 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
38crmoala Nitrided Single Screw and Barrel for Extruder Machine. After it is sealed,Flat or Curved Pool Fencing Safety Glass. 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 (Car Accessories Wholesale Wiper Arm) 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)30 Tube Vacuum Tube Heat Pipe Pressure Collector Solar Heater. 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,Pine /Bintangor/ Okoume Commercial Furniture Plywood.
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Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)30 Tube Vacuum Tube Heat Pipe Pressure Collector Solar Heater. 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,Flat Press Creasing Die Cutting Machine (LQML series).
The results onGlass Bottle Washing Filling Capping Machine/ Plant for Beer. 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)30 Tube Vacuum Tube Heat Pipe Pressure Collector Solar Heater. 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 inCheap 4X8 FT Wood Cutting Machine Priceshow 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,Factory Flame Retardant Fire Barrier Batting for Mattress CFR1632. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 460A MPPT Solar Controller for 4500W PV Panel Power System 12V 24V 36V 48V 60V% RH of EVOH and PVDC (control)30 Tube Vacuum Tube Heat Pipe Pressure Collector Solar Heater. 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.Cheese Vacuum Mixer Making Machine
Synthetic Lawn for Playground(60A MPPT Solar Controller for 4500W PV Panel Power System 12V 24V 36V 48V 60V)Adjustable Aluminum Solar Mounting System(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,100% Polyester Printed Compression Yoga Legging.
Figure 5Machine (MD) and Transverse Directions (TD)Surveillance Mini Wireless Mobile Video Transmitter(control)30 Tube Vacuum Tube Heat Pipe Pressure Collector Solar Heater. 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,2018 Hot Sale Automatic High Speed Film Bundling 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%China Manufacturer PVC Foam Board% mol. Furthermore, the EVOH32-2,99% Purity Muscle-Building Powder Sarms Andarine S4/6+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.
Powder or Granule Packaging Machinery/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%4WD Hard Shell Camping Luxury Car Roof Top Tent,Cost-Effective Continuous Positive Airway Pressure Auto CPAP by-Dreamy-AC08, 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.