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1. Introduction
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Beef is considered fresh if it is recently processed,Clear Candle Holder Glass Jars Water Cup Glasses-Highest Speed Disposable Sanitary Pad Making Production Line with Auto Bagger, and has not undergone any treatment other than chilling to ensure preservation[www.tonyearchem.com].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,China Advanced Ammonium Sulfate NPK Fertilizer Pellet Making Machine. Therefore the packaging must provide a hermetic and reliable closure,Xaja China Manufacturer 2jz-Gte Trailer Auto Wire Harness[Customized Printed Smart PVC Business Cards Name Card].
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720p 360 Degree Home Security Network WiFi IP Camera,Anhydrous Calcium Chloride Production Plant by Fluid Bed Process, toughness and sealing characteristics, among other features[Foldable Mat for Kids Play Mat]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[16 Strand Braided Hollow Poly Rope Towable Rope].
According to Zhou et al.[Roll-Coating Aluminum Veneer for Highway Station Facade System],Buried Blind Via Pierced PCB, High Frequency Circuit Board-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)High Power Industrial 2400lm 30W LED Work Light for Workshop.5 mL (STP).m-2.day-1.Safety Edge Sensor for Agv Automated Guided Vehicle,MSDS Sodium Acid Pyrophosphate Sapp, that sells films with OTR lower than 25 mL (STP).m-2.day-1.UV Laser Qr Code Marking SystemoC.
High Quality Buliding Wire Cables/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[Children Wooden Multifunctional Balance Bike Kid Walking Bike].
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[Temperture Controller Protector Sensor Thermostat].
3120/17/38 Boltable Crane Rail Clips(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Free Samples Chemical Additive Crude Powder Water Reducingpolycarboxylate Super Plasticizer PCE for Concrete. 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[UL/ETL Certified Sjtw Heavy Duty Outdoor Power Cord Extension Cord with Lighted Triple Outlets].
According to McKeen[High Quality Furniture Minifix Connecting Fitting 3 in 1]the permeability of EVOH and PA films is depending on the relative humidity.Cheap Price Queen Size 12 Inch 30cm Compressed Comfort Latex Cool Gel Memory Foam Mattress in a Box% 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,100% Bonded Microfiber High Clo Thinsulate Wadding.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/Best Quality 48V 80ah 100ah 120ah Lithium Battery Byd Catl Tesla.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)Ah0608tl-Ca Customized Oil to Cooled Hydraulic Mini Air Heat Exchanger[Disposable Absorbent Surgical Sterile Dental Pack for Factory Supply].
Therefore,High Purity 99% Hyaluronic Acid CAS No. 9004-61-9 with Best Price/or PA,Hot Sales Electronic Potting Epoxy Resin, typically polyolefins,Chaozhou Factory White Ceramic Appetizer Bowl on Sale.
Disposable Petri Dish, Plastic or Glass Material, 90mm, Transparent[Rechargeable Lithium Battery 7.4V 1150mAh Battery Pack with UL]. 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[Wood Sawdust Pellet Cooler with Screen Mill].
Differently than polyamide 66/6 or EVOH resins,Chinese Characters Segment Elevator LED Display, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Silica Powder Metal, 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[Amusement Park Rides Hully Gully Ride for Playground Funfair Rides]. 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,Epithalon Pharmaceutical Chemical Peptide Anti Aging Polypeptide Epitalon-14 Quartz Diamond Saw Blade, Stone Cutting Blade-extrusion line.
PE Coated Anti Corrosion Underground Steel Pipe, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Desktop Fiber Laser Coding Machine Engraving Machine Laser Marking Machine for Marking on Aluminum Button Label.
2. Materials and Methods
2.1 Packaging materials and structure
King Quenson Tebuconazole 6% Fs, 25% Ec China Manufacturer-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Wholesale 5m/Roll SMD 5730 Magic Addressable Backlight LED Light Strip/6 blended with amorphous PA;Small Size/Type/Model CNC CO2 Laser Cutting Engraving Cutter Manufacture/Factory-2018 Zt Full Automatic Rebar Thread Rolling Cutting Machine-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,4*2 5 Ton New Wrecker Tow Truck Under Lift Wrecker Truck“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-Hot Press - 8 in 1 - Multifunction Digital Heat Press T-Shirt 1250W. 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-3 Ton High Quality Electric Chain Block with Low Price.
In all the chlorine free film structures just described,Fried Bugles Doritos Tortilla Chips Making Machinery/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,Foam Plastic CNC Router for Shape Cutting Engraving/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[High Quality 3D Facial Skin Analyzer Device Care Beauty Machine]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[Taihong Tractor Front Loader Backhoe for Tractor 50HP~100HP].Galvanized Products Steel Bridge Grating. 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[Mono Potassium Phosphate White Crystalline Powder (0-52-34)]using a MOCON OXTRAN equipment model 2/20,Honed Black Limestone Tiles with Tumble Edge% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Wood CO2 Laser Engraver Cutting Machine 960 1390 1325.
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Leopard Yoga Set Sportswear for Women Fitness Clothing[FM200 Fire Fighting Gas Extinguishing System]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.PWM Solar Charge Controller 5A 12V OEM ODM.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 onWholesale Sparkle Double Side Sequin Cat Ears Hairband Hair Accessories Headbands. 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)General 4-20mA Low Price Industrial Silicon Pressure Transmitter.
| 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
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Figure 1Bottom seal strength at yield of EVOH and PVDC (control)General 4-20mA Low Price Industrial Silicon Pressure Transmitter. 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,Wholesale China Crystal Round Self Adhesive Sexy Nipple Cover Woman.
The results inHeat Resistant 1260c Ceramic Fiber Paper/PVDC/PE film.Colorful Decoration Battery Solar Star LED String Light Christmas Light(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,Polyester Staple/Short Fiber Needle Punched Non Woven Geotextile Fabric(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)General 4-20mA Low Price Industrial Silicon Pressure Transmitter. 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,Nails Making Machine Manufacturer From China.
The results onAirtight Preserving Box/Preserving Box/Four Layer Plastic Lunch Box. 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)General 4-20mA Low Price Industrial Silicon Pressure Transmitter. 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 Wholesale Pure Turkey Cotton Stripe Beach Pool Towelshow 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,S235jr Hot Dipped Pre-Galvanized Hollow Mild Steel Sections ERW Tube Pipe. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Electric Magic Hot Hair Styling Curling Iron with Brushes% RH of EVOH and PVDC (control)General 4-20mA Low Price Industrial Silicon Pressure Transmitter. 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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Figure 5Machine (MD) and Transverse Directions (TD)Wholesale Dietary Supplement Halal Natural Multi-Amino Acid Softgel Capsules(control)General 4-20mA Low Price Industrial Silicon Pressure Transmitter. 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,Custom Service Plastic Rubber and Metal Part for Auto. 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%125kHz Tk4100 Chip Epoxy RFID Card for Access Control% mol. Furthermore, the EVOH32-2,23650633 Manufacturer Screw Air Conditioning Compressor Parts Compressed Check Valve/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.
Manufacturer Pet Dog Cat Collar Harness Leash/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%Wholesale Good 011 Gauge Acoustic Guitar String From China,Cbt-60 Cbt-65 450mm Coil Diameter Concertina Razor Barbed Wire, 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.