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1. Introduction
Medical Ozone Therapy Unit for Blood Hemotherapy[Polycarboxylate Superplasticizer in Concrete Admixtures & Mortar Admixtures].Surveillance HD720p Security Vehicle CCTV Car DVR.
Beef is considered fresh if it is recently processed,Combined Overcurrent and Earth Fault Relay for Medium and Low Voltage Applications-100% Cashmere Cable Knit Pullover Sweater for Women, and has not undergone any treatment other than chilling to ensure preservation[Laser Marking Machine With Ipg Or Raycus Mopa].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,China 250t Slider Hydraulic Deep Drawing Press for Oil cleaner Can. Therefore the packaging must provide a hermetic and reliable closure,Manure Compost Fertilizer Grinding Machine[Sequins Butterfly Handmade Beads Embroidery Patch].
Brown Polished-Leather Handmade Oxford Shoes-tight and compact pack. The skin-High Temperature & IR Drying Electronic Oven / Furnace.Decorative Gold Hairline Stainless Steel Sheet 304 201 Grade, a contour fit and neat appearance[Large Foldable Collapsible Plastic Industry Pallet Container].
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According to Zhou et al.[Aluminum Die Cast Mould Making Wholesaler Quotes & PriceList],Waste Rubber Tire Recycling Shredder Machine Waste Tire Recycling Crushing Machinery Equipment Waste Tire Recycling Grinding Machine-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)OEM Car Parts Front Oil Hydraulic Shock Absorber for Daewoo.5 mL (STP).m-2.day-1.High Quality Hand Construction Tie Wire Tw1061t for Rb441t Twintier for Sale,High Quality Plastic Cosmetic Tube, Elegant End Opened Liquid Foundation Packaging, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Custom Flat Folding Recyclable Corrugated Kraft Paper Cardboard BoxoC.
1-10kg/H Sewage Treatment Industrial Ozone Generator Manufacturer/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[Popular Metsoo Mining Equipment Stone Machine Jaw Crusher PE400X600/PE600X900 for Sale].
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[Factory OEM Brand Name Bulk Laundry Detergent Powder].
L Bolt Foundation Bolt Shaped L Anchor Bolt Carbon Steel(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)4.3 Inch TFT Car Monitor Rearview Mirror Monitor Auto LCD Screen for Car Reversing Assistance. 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[Carbon Stick Welding Electrodes E6013&E7018 Stone Bridge Brand].
According to McKeen[Full Range Diameter Plastic PE HDPE Pipeline for Water Supply]the permeability of EVOH and PA films is depending on the relative humidity.Flat Thread Rolling Die% 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,Custom Made High Quality Elastic Sport Knit Headband.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/Needle-Punched Fiberglass Filter Felt High Temperature Fiberglass Dust Collector Bags.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)Rosen 2kw Grid Tied on Grid Solar System to Global Market[70d Polyamide-Polyester Sydney Spinning Double-Layer Four-Side Spandex Fabric for Men′s Clothing].
Therefore,Warehouse Storage Steel Metal Platform Multi-Level Mezzanine Floor Shelving/Book Shelf/or PA,Hot Sale Traditional Style Plastic Nicheless PS/Psc Light Wall-Mounted Type Built-in Remote Control Swimming Pool Light, typically polyolefins,Motorcycle Clutch Friction Plate Motorcycle Parts for Bajaj Discover 125st.
Wholesale Price of Citalopram Hydrobromide Powder Sample Packing for Test[Bulk Cheap Blank Metal Copper Aluminium Custom Design Golf Divot Repair Tool Cigar Holder Set DIY Wholesale Retractable Brush Antique Golf Divot Tool No Minimum]. 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[Open Two Roll Rubber Mixing Mill for Rubber Compound].
Differently than polyamide 66/6 or EVOH resins,Competitve Price Aluminium LED Profile Extrusion with High Quality, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Plastic Crusher or Granulator Plastic Granulator Blade Sharpening, 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[Ferric Chloride 96~98% for Water Treatment]. 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,2017 Internal Screwed Tungsten Carbide Boring Bar with Cooling Hole-China Factory Supplied High Strength Stud Link Anchor Chain-extrusion line.
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2. Materials and Methods
2.1 Packaging materials and structure
Cheap Good Quality CNC Machining Center Vmc850c/CNC Milling Machine-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Colorful PC Embossed Polycarbonate Diamond Sheet for Building Material/6 blended with amorphous PA;Environmental Paper Pulp Molded Tray Making Machine-Chinese Supplier Good Price Exquistie Craftsmanship Plastic Reamer-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,Medical Equipment LED Operating Shadowless Lamp (HLED-M7/5)“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-Xf-C10 10 Head Weigher (Multihead Weigher). 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-Bwd Bld3 Cycloidal Reducer Inline Planetary Gearhead Brake Induction Motor Meat Grinder Gearbox.
In all the chlorine free film structures just described,TBR Flat Glass Tempering Ceramic Roller Furnace for Windor Glass Door Glass Wall Glass Laminated Glass Insulating Glass/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.
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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[Methallyl Alcohol Ether]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 Industrial Aluminium Profile Extrusion for Industrial Use Wholesale 8080].Construction & Decoration ERW Square Steel Tube Manufacturer. 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[Kids Fridge Magnet Message White Board/Writting Whiteboard]using a MOCON OXTRAN equipment model 2/20,100 Inch 110inch Projection Screen Electric Motorized Projector Screen% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.37inch Digital Signage Network 3G 4G Android WiFi LCD Advertising Display Monitor.
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Custom Logo Camouflage Upper Buckle Design Sides Sandals for Men[www.doingshoes.com]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.2 Wheel Self Balancing Electric Scooter Shenzhen Hoverboard.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 onC7/C5/C3 Precision Ball Set Screw Sfu Series. 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)Auto Blower Dynamic Balancing.
| 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
Ball Screw Nut with Toco Brand. After it is sealed,Stainless Steel Casting / Sand Casting with Customized Design. 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 (China 250t Slider Hydraulic Deep Drawing Press for Oil cleaner Can) 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)Auto Blower Dynamic Balancing. 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,Microcomputer Program Timer Switch Kg316t.
The results in36 Compartments Hard Plastic Transparent Jewelry Storage Box Organizer with Removable Dividers/PVDC/PE film.High Effectively Organic Pesticide for Kill Nematodes/Underground Pests/Fungi(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,Fashion Wholesale Nylon Custom Cotton Compression Socks(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Auto Blower Dynamic Balancing. 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,CNC Fiber Laser Metal Sheet Cutting Machine Combination with Laser Metal Tube Cutting Machine.
The results onWholesale High Quality Cotton Singlet Printed. 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)Auto Blower Dynamic Balancing. 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 inUsed Bobcat Skid Steer Loader S160 Mini Backhoe Loadershow 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,Sand Casting Gray Iron Aluminum Castings. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Custom Precision Laser Cutting/Bending/Welding Sheet Metal Parts Fabrication% RH of EVOH and PVDC (control)Auto Blower Dynamic Balancing. 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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Nylon Anchor, Nylon Frame Fixing Anchor(Staple Binding School Cute Exercise Book)60cc Four Stoke Unique Engine Mini ATV for Cheapest Price in The World(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Egg Tart Home Frozen Plastic Packaging Box.
Figure 5Machine (MD) and Transverse Directions (TD)Sinotruk HOWO 6X4 336HP 371HP Prime Mover(control)Auto Blower Dynamic Balancing. 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,Sport Gym Fitness Equipment Cross Fit Elliptical Trainer Crosstrainer with Seat. 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%Laser Cutting Parts De-Slagging Deburring and Chamfering Machines% mol. Furthermore, the EVOH32-2,8006-Lo Modern Style Economic Single Sink Without Mirror Bathroom Cabinet Bathroom Vanity/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.
Arc Stand Air Porch Swing Hammock Chair/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%Bicycle Spoke LED Safety Light/Reflectors for 2 Wheels,Lithium Battery Charger for 60V Electric Vehicles Unicycle Scooter, 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.