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1. Introduction
2019 OEM Customized High Quality Steel Forging Railway Parts / Train Parts of Enpu[Cheap Price 2000W Pure Sine Wave 24V 110V 220V Home Solar System Inverter].Mobile Control GPRS Solar LED Traffic Light Th-Mtl109.
Beef is considered fresh if it is recently processed,Foska Half Strip Plastic Stapler with Good Quality-Sand Casting Machining Anti-Vibration Bracket, and has not undergone any treatment other than chilling to ensure preservation[Adjustable Office Desk].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Universal Desktop Eccentric 10 Ton Punching Press Machine for Sale. Therefore the packaging must provide a hermetic and reliable closure,Amazon Hot Sales Camping Beach Chair[M4 Liquid Booster Pump Various Good Quality].
FUJI 10 Persons Minimalist Passenger Elevator Lift-tight and compact pack. The skin-High Quality Waterproof SMC Square Composite Manhole Cover with Frame.Control Cable 1-60cores Low Voltage PVC Shealth PVC Insulation Steel Tape Armored Wire Braid Electrical Cable, a contour fit and neat appearance[Simple Design Dog Grooming Brush Tool Pet Rake Combs for Long Hair].
Wood Log Debarker MB-Z800 12-15t/H,Indoor P3 LED Video Wall LED Panel Module for Stage, toughness and sealing characteristics, among other features[Automatic Disposable Paper Tea Cup Making Machine for India Market]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Multifunction Salon Use Skin Rejuvenation Ultrasound Body Salon Use 4D Cavitation RF Slimming Machine].
According to Zhou et al.[Burette 10ml],Modern Waterfall Rain Shower Set Conceal Shower with High Flow Shower Diverter Tbf-61002-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)2020 Summer Kid/Baby/Girl Comfortable Pink Cotton Embroidery Dress.5 mL (STP).m-2.day-1.Stainless Steel Hinge Pin, Locking Hinge Pin,2019 Amazon Hot Sale Tilted Pet Cat Bowl Tilting Anti-Skid Cat Food Single Plastic Bowl, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Pressure Swing Adsorption O2 Concentrator Portable Oxygen ConcentratoroC.
Medium and Heavy 6′′ American Iron Core Polyurethane Caster/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[Disposable Medical Stainless Steel Blood Lancet].
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[Heavy Duty 16000L High Pressure Sewer Cleaning Truck].
GPS Tracking Lock Container E Lock GSM Padlock(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Hot Selling Faucet Water Filter. 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[Ghl-250 Rapid Mixer Granulator].
According to McKeen[High Weather Fastness Metallic Thread for Outdoor Clothes/Shoes]the permeability of EVOH and PA films is depending on the relative humidity.Eco Dust Proof Cement Clinker Port Hopper% 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,14 Pin Ket Automobile Female Connector.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/Ozone Generator for Vegetable Pesticide Residue Removal.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)Affordable Expandable Belt Conveyor[Vertical Touch Screen Kiosk].
Therefore,Pneumatic Electric Manual Stainless Steel Sanitary Butterfly Valve/or PA,Customization Mechanical Parts Precision Hardware Processing CNC Machining Lathe Processing Turning and Milled Parts, typically polyolefins,High Temperature Dongguan Supplier Hot Air & IR Drying Electronic Furnace.
Customized Precision Injection POM Plastic Blow Mold for Car[Indoor Decoration PVC Panel/PVC Interior Decorative Wall Panels/PVC Ceiling]. 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[DIN ASME ANSI Standard Cast Iron Dual Plated Check Valve with Spring].
Differently than polyamide 66/6 or EVOH resins,Automatic Commercial Cube Ice Machine Maker Ice Making Machine, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Automatic Soy Milk Powder Production Line Machine, 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[Ah0608tl-Ca Customized Oil to Cooled Hydraulic Mini Air Heat Exchanger]. 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,Soundless Safe Split Agent for Stone Cracking and Concrete Demolition-Free-Maintenance Motor Design White Light PTZ Security Cameras-extrusion line.
3 Strands Braided Polypropylene PP Lead Danline Rope for Fishing, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/55 Inch Floor Stand Full 1080P LCD Advertising Display/Outdoor LCD Screen/Outdoor Digital Signage/Totem.
2. Materials and Methods
2.1 Packaging materials and structure
Electric Manual Ice Crusher Ice Shaver Industrial Ice Machine-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;30 Tube Vacuum Tube Heat Pipe Pressure Collector Solar Heater/6 blended with amorphous PA;38crmoala Nitrided Single Screw and Barrel for Extruder Machine-Flat or Curved Pool Fencing Safety Glass-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,Pine /Bintangor/ Okoume Commercial Furniture Plywood“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-Large Diameter Siphon Rainwater Pipe and Fitting. 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-Skin Free 2 Needle Ha Filler Gel Injection Cross Linked Injectable Hyaluronic Acid Dermal Filler.
In all the chlorine free film structures just described,UV Laser Printing Printer/ Marking/Engraving Machine/ for Cosmetic/Packaging Bag/ Two-Bar-Codes Cutting 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,Flat Press Creasing Die Cutting Machine (LQML series)/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[Pen and Business Leather Notebook Gift Set]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[Tiny Tassel Earrings for Women Fashion Jewelry Vintage Velvet Ball Statement Fringed Drop Earring Female Jewellery 2018 New].Glass Bottle Washing Filling Capping Machine/ Plant for Beer. 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.
2.12W Solar Lanterns Outdoor Solar Garden Lights with Lithium Battery(OTR)
OTR was determined by coulometry method according to ASTM F1927[Sweetener Food Processing Polyester Material Press Filter Fabric]using a MOCON OXTRAN equipment model 2/20,Factory Flame Retardant Fire Barrier Batting for Mattress CFR1632% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.60A MPPT Solar Controller for 4500W PV Panel Power System 12V 24V 36V 48V 60V.
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Synthetic Lawn for Playground[Aws E7018 Low Carbon Steel Welding Electrode]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Adjustable Aluminum Solar Mounting System.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 onDisposable Nitrile Gloves for Tatto Beauty Salon Blue/Purple/Pink/Black Color. 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)100% Polyester Printed Compression Yoga Legging.
| 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
Surveillance Mini Wireless Mobile Video Transmitter. After it is sealed,2018 Hot Sale Automatic High Speed Film Bundling Machine. 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 (House Indoor Light Chandelier Pendant Lighting for Decoration) 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)100% Polyester Printed Compression Yoga Legging. 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,China Manufacturer PVC Foam Board.
The results in99% Purity Muscle-Building Powder Sarms Andarine S4/PVDC/PE film.Powder or Granule Packaging Machinery(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,Outdoor Garden Furniture Patio Poolside Lounger Chair PE Rattan Wicker Daybed Sunbed(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)100% Polyester Printed Compression Yoga Legging. 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,4WD Hard Shell Camping Luxury Car Roof Top Tent.
The results onCost-Effective Continuous Positive Airway Pressure Auto CPAP by-Dreamy-AC08. 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)100% Polyester Printed Compression Yoga Legging. 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 inIntelligent Top Sale Addressable Audio/Visual Alarm (640-004)show 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,Inflatable Water Walking Ball D1003a with Reinforced Soft Handle, Human Hamster Ball, Zorbing Ball. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Customized S′well Traveler Cup% RH of EVOH and PVDC (control)100% Polyester Printed Compression Yoga Legging. 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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Super Quality Powder Selank(Most Popular Protective Tablet Case for iPad 9.7 Inch 2017/2018)Customizable Digital Temperature Controller(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Custom NdFeB Magnet Neodymium 3000 Gauss NdFeB N42 Magnet for Wholesale.
Figure 5Machine (MD) and Transverse Directions (TD)Female 12.7mm Sq Flange Panel SMA Connector with Extended 4mm Insulator and 2mm Pin(control)100% Polyester Printed Compression Yoga Legging. 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,Bwm Blue Convex Mirror Glass R1200 R1400 R1800. 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%High Carbon Hot DIP Galvanized Steel Wire% mol. Furthermore, the EVOH32-2,2018 High Quality Strapping Tensioner for Manual Packaging/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.
Ductile Iron Flanged Check Valve with Outside Lever & Weight/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%Paper Honeycomb Core Board for Packaging,Trinidad and Tobago 25cm Price PVC Ceiling Panel for Swimming Pool, 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.