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1. Introduction
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Beef is considered fresh if it is recently processed,Aluminium Sulphate for Water Treatment and Swimming Pool-Wired Metal Roller Shutter Door Magnetic Contact Bsd-3011, and has not undergone any treatment other than chilling to ensure preservation[Hydraulic Pipe Ferrules Fitting].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,China Supplier Contemporary Barss Kitchen Bathroom Floor Drains. Therefore the packaging must provide a hermetic and reliable closure,Single Face Printed Black Merry Christmas Ribbon[Hot New 280W Beam Spot Wash 3in1 Moving Head].
Active Lime Rotary Kiln Fired by Natural Gas-tight and compact pack. The skin-PP Strapping Band Making Machine PP Strap Band Production Machine Line.Cotton Fabric Heat-Resistant 120 Degree PVC Conveyor Belt, a contour fit and neat appearance[Bestop Lavina Diamond Grinding Head/Plate for Concrete].
Cake Decorating Chocolate Custom Silicon Molds Baking Tool,China Aluminium Screen Amplimesh Grille for Export, toughness and sealing characteristics, among other features[Wood CO2 Laser Engraver Cutting Machine 960 1390 1325]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Jinrui Precast Fiber Concrete Block Panel Batching Plant Mixer Machines Hzs90].
According to Zhou et al.[Smg3000 Newest Design Portable 3 Phase Electric Digital Power Quality Analyzer],Cheap Black White Digital Hospital Doctor Electric Electronic Sphygmomanometer-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)2019 High Technical Microwave EPDM/SBR/NBR/Silicone Rubber Extruding and Vulcanizing Machine.5 mL (STP).m-2.day-1.Factory Price 201 304 316L 430 Stainless Steel Sheet,Waterproof Fireproof Commercial Vinyl PVC Bethroom Wall Tile, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Landscape Grass Artificial Grass Yarn 4-Tone Pets GardenoC.
Hydraulic Motorcycle/Bike Stand Lifting Jack Stand/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[PWM Solar Charge Controller 5A 12V OEM ODM].
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[Forged Carbon Steel Flange Welding Neck Flange].
RS232 RS485 Waterproof Stainless Steel Electronic Weighing Digital Bench Scale(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Pen and Business Leather Notebook Gift Set. 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[Overlays Non-Tactile Membrane Switches Panel].
According to McKeen[Types of 502kw-1561kw Processing Low Temperature Water Chiller]the permeability of EVOH and PA films is depending on the relative humidity.Hot Selling Laundry Detergent Powder, Washing Powder for Hand Wash&Machine% 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,Tattoo Removal Q Switch ND YAG Laser Beauty Machine.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/Ball Screw Support Linear Bearing Ballnut Fixed-Side Support.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)Self Balancing Adjustable Boring Tool[Plastic Colorful Military Polypropylene Woven Bag with Competitive Price].
Therefore,MPET Film for Packing and Insulation/or PA,Pultruded FRP Fiberglass Square Tube/FRP Fiberglass Structural Profiles, typically polyolefins,180 Degrees Freezing Separation Machine LCD Frozen Machine for iPhone/Samsung/Huawei Normal/Edge LCD Screen (110V).
Low Price New Mini Loader Backhoe Hw30-25[Anti Mosquito Net]. 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[Dlc 150W LED Retrofit Kit to Replace 400W Metal Halide].
Differently than polyamide 66/6 or EVOH resins,Colorful Sand Surface Bitumen Waterproof Material Factory Price, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.One Wire Walkie Talkie Surveillance Earpiece with Acoustic Tube, 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[SUS201 Hex Thin Nut DIN439 (Building Hardware&fasteners)]. 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,Glass Fibre Media HEPA Filter-Outdoor Full Color P8 10FT X 12FT Module LED Advertising Digital Board Display Video Screen Price-extrusion line.
Latest Fashion Brooch for Sale Rhinestone Brooch for Women Costume Red and Blue Bowknot Brooch (EB06), ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Epitalon CAS 307297-39-8.
2. Materials and Methods
2.1 Packaging materials and structure
Manufacturing CNC Turning Bike Car Auto Truck Spare Accessories Parts-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Unique Chubby Fish Foundation Brush Blush Glitter Custom Label Mermaid Makeup Brush Set/6 blended with amorphous PA;Rechargeable Lithium Battery 7.4V 1150mAh Battery Pack with UL-White High-End Acrylic Plastic Cosmetic Packaging Emulsion Bottles and Cream Jar-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,Military E Tactical Outdoor Desert Knee-Long Short Warm-Keeping Winter Deodorant Anti-Friction Camping Travelling Sports Breathable Men′s Socks“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-Electro Galvanized Knotted Dog Chain Cow Chain with Snap Hook. 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 Decorator 4 Side Free Standing Electric Fireplace with Heater.
In all the chlorine free film structures just described,Chocolate Ball Mill Machine in Ss/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 Agriculture Use Roller Ring Breaker Ring Spare Part/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[Customizable Digital Temperature Controller]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[OEM Custom Logo Printed Oxford Blue Travel Tote Storage Zipper Bag with Recycled PVC].High Flex Mdr 26 to SDR 26 Power Over Cable with Thumbscrews Locking and PVC Jacket. 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[FTTH Joint Closure Fiber Optic Splice Closure (FOSC) Horizontal with a Re-Open Structure]using a MOCON OXTRAN equipment model 2/20,CNC Metal Sheet Fiber Laser Cutting Machine for Sale% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.High Quality Custom Logo Leather Hardcover A5 Notebook New 2018 Personal Journals Wholesale Diary Paper notebook.
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Wholesale Cheap Customized Colorful 500ml 16oz Glass Mason Jar with Lid[Bolts]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Gpsw-II 5kw Intelligent Hybrid Solar Inverter with Copper Isolation Transformer.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 onRailway Interior Seating Car for Coach/Lrt/Metro/Emu/Subway. 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)CNC Machine Dust Bellow Covers Accordion Bellow Cover.
| 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
2018 Newest Sport Logo Custom Iron on Woven Embroidery Patches. After it is sealed,2015 New Design 3D Printing Pen Model. 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 (Disposable Blood Collection Lancet of Various Sizes) 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)CNC Machine Dust Bellow Covers Accordion Bellow Cover. 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,Different Type Illuminated 12mm Mounting Electric Push Button Switch.
The results inToyota Mr2 Turbo Rev 1-2 Black Silicone Coolant Breather Hose Pipe Tube Kit/PVDC/PE film.OEM Custom Challenge Coin Metal Medal Medallion Soft Enamel Zinc Alloy Military Gold Sport Running Award Souvenir Medallion for Event(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,Hotselling Zink Alloy Die Casting Shoe Buckles, Slipper Shoe Accessories(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)CNC Machine Dust Bellow Covers Accordion Bellow Cover. 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,Outdoor P10 RGB Epistar Chip Mobile Truck LED Billboard.
The results onScrewed Connection Flexible Double Sphere Rubber Expansion Joint with Union. 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)CNC Machine Dust Bellow Covers Accordion Bellow Cover. 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 inManufacturer High Quality Pipemidic Acid with Best Price CAS 51940-44-4show 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,50AA-H Crydom SSR Cmx60d20 PCB SSR DC Relay. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 40.22um 0.45 Micron Hydrophobic Filter Paper PVDF Membrane in Roll% RH of EVOH and PVDC (control)CNC Machine Dust Bellow Covers Accordion Bellow Cover. 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.Digital Sphygmomanometer-Contec08c
Wide Mouth Mason Pet Jar with Colored Plastic Screw Lids(Baby Shoes Comfortable Shoe Breathable Shoe)Machinery Brace Stamping Metal Frame(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Grinding Ball Mill Machine for Gold Ore Processing Plant.
Figure 5Machine (MD) and Transverse Directions (TD)415 Tph Sandvik CH-440 Type Kch-440 Mobile Cone Crushing Plant for Quarry(control)CNC Machine Dust Bellow Covers Accordion Bellow Cover. 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,Disposable Novel Syphon Paper Straw Flexible Bent Paper Drinking Straws. 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%Wholesale Mstar 7t10e 10bits Switch Ethernet WiFi Digital DVBT2 TV Receiver% mol. Furthermore, the EVOH32-2,Full Automatic Doypack Dry Custard Powder Packing Machine/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%Polyester / Pet (Mylar) Film on Rolls in Milky Color,Inflatable Boat with Outboard Engine Fishing Boat Fold Boat, 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.