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1. Introduction
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Beef is considered fresh if it is recently processed,News Style Small Metal Wire Shopping Basket-Single System Computer Flat Knitting Machine, and has not undergone any treatment other than chilling to ensure preservation[Brass Water Meter Connector].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Rto/Rco Cordierite Ceramic Honeycomb for Regenerative Thermal Oxidizer. Therefore the packaging must provide a hermetic and reliable closure,Cummins Qsm11 Engine Piston Cooling Nozzle 3080708[Internal and External Tooth Lock Washers / DIN 6797/Toothed Lock Washer].
201 301 304 Cold Rolled Stainless Metal Steel Plate-tight and compact pack. The skin-High Tensile Strength Razor Wire Cbt-65.Middle Borosilicate Glass Tubular Injection Bottle 30ml, a contour fit and neat appearance[Strong Reclining Hydraulic Barber Chair for Sale].
Post Tensioning System Fastener PC Strand Flat Anchorage,Popular Metsoo Mining Equipment Stone Machine Jaw Crusher PE400X600/PE600X900 for Sale, toughness and sealing characteristics, among other features[Double Sided Aluminum Foil Bubble Thermal Insulation Material/ Double Sided Reflective Foil Insulation for Roof and Wall]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Double Side Aluminum Foil Coated Non-Woven Fabric Roofing/Duct Vapor Barrier/Heat Resistance Insulation].
According to Zhou et al.[Electronic Pcb Design],Ep4t Commercial Single Layer Electric Pizza Oven /Baking Oven for 4X12 Pizza-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Plastic Coated Aluminium Mesh Price Expanded Metal Sheet for Decoration.5 mL (STP).m-2.day-1.6063t5 Anodized Aluminium/Aluminum Extrusion Enclosure with Die Casting Covers,4in1 Functional Diamond Dermabrasion Hydra Deep Facial Cleansing Peeling Microdermabrasion Machine, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Embossed Pattern PU Leather Classic Mens WalletoC.
Good Future Interior MDF/HDF White Primed Painted Moulded Door/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[Cummins Qsm11 Engine Piston Cooling Nozzle 3080708].
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[Precisely Cutting Textile Lifting Sling Webbings Cutting and Winding Machine].
New Outdoor Hiking Climbing Shoes Sports Safety Shoes(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Vmc650 CNC Machining Center CNC Aluminium Milling Machines. 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[Medical Equipment LED Operating Shadowless Lamp (HLED-M7/5)].
According to McKeen[Hot Dipped Galvanized Concetrtina Razor Barbed Wire]the permeability of EVOH and PA films is depending on the relative humidity.China Granite Headstone with Flower Engraving% 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,Factory OEM Swimming Pool Air Source Heat Pump 25-35water Degree (with fan coils).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 Children Board Colors Book for Counting.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)Custom Design Mens Cotton Dress Happy Socks[Office Carpet Commercial].
Therefore,Baking Soda / Food Grade Sodium Bicarbonate/or PA,2019new Design Wholesale Good Quality Colorful Makeup Brush PU Zipper Leather Case Makeup Brush Set Storage Barrels, typically polyolefins,AISI316 AISI304 Gasket Plate Heat Exchanger / Apv Gea Replacement Parts.
Customized 26AWG Wire Neon Indicator/LED Lamp with High Quality[En10210 Hot Finished Shs of 500X500mm 600X600mm]. 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[Ceramic Fillers Partition Ring for Rto].
Differently than polyamide 66/6 or EVOH resins,S60h Bosch Type Nozzle Tester, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Police Disposable Nylon66 Handcuff with Two Loop, 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[Arc Stand Air Porch Swing Hammock Chair]. 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,FRP / GRP Corrugated Sheet Making Machine 3 Layers Making Machine-Top Class High Quality Customized Size Natural Latex Foam Mattress-extrusion line.
High Power Aluminium IP66 Solar Lightings 60W/100W/150W/200W LED Street Light Solar Lamp Solar Street Light Outdoor Wall Light, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Customized OEM Cheap High Quality Injection Plastic Mould.
2. Materials and Methods
2.1 Packaging materials and structure
Low Price Vertical Pipeline Ore Magnetic Separator for Build Materials/Cement Industry (RCYF-1200)-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Fiber Laser Tube Cutting Machine Manufacturers and Suppliers/6 blended with amorphous PA;Used Tire Processing Machine Crumb Rubber Processing Machine Rubber Tyre Powder Machine-OEM Outdoor Baseball Cap with Bottle Opener-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,Heat Insulation Materials Metal Stone Coated Roofing Tile for Building“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-Desktop High Frequency and Precision Glue Dispensing Machine. 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-BS5896-2012 15.70mm Super 7 Wire PC Steel Strand.
In all the chlorine free film structures just described,Ceramic Fillers Partition Ring for Rto, Lessing Ring/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,Indoor Hanging Planters Glass Terrarium Decor for Sale/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[Stainless Steel Intelligent Pneumatic Butterfly Valve with Union]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[ FPC for LED].Home Use 3kw Grid Tie Solar System. 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[Watch PVD Vacuum Ion Deposition Cathode Arc Evaporation Equipment]using a MOCON OXTRAN equipment model 2/20,PVC Panel Ceiling Panel Decoration Wall Panel (normal printing, hot stamping, lamination)% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.High Performance JS Polymer Modified Cement Waterproof Coating for Basements.
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High Efficient Solar Insecticidal Lamp[Sanitary Manual Mini Diaphragm Valve with Handwheel for Beverage]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Blue LED Car Sign LED Scrolling Adervitising Display Sign.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 onEco-Friendly PVC Foam Board for Advertising. 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)Disposable RFID Paper Card for Exhibition and Trade Show Ticket.
| 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
Fashion Birthday Gift Paper Business Gift Box Wrapping Paper DIY Handmade Package Book Paper. After it is sealed,Eco-Friendly PVC Foam Board for Advertising. 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 (High Quality Ladies Bag Fashionable Clutch Designers Leather Handbag) 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)Disposable RFID Paper Card for Exhibition and Trade Show Ticket. 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,for Ford Car Replica Alloy Wheel Foad Focus Replica Alloy Wheel Rim.
The results inCustom Waffle Cotton Terry Towel Bathrobe/PVDC/PE film.Small Gift Box with Ribbon(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,2018 New Arrival Licensed Electric Kids Ride on Car Toy 12V(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Disposable RFID Paper Card for Exhibition and Trade Show Ticket. 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,Custom Logo Trendy Fashion Ladies Gift Quartz Wrist Watches.
The results on3 Feet Fuel Line for 07-017 682039 791-682039 791682039 781-682039 B1ry22. 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)Disposable RFID Paper Card for Exhibition and Trade Show Ticket. 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 in Metalshow 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,Aluminium Profile for Casement Windows and Doors. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4XCMG Official Manufacture Tractors Mini Tractor Construction Equipment Bulldozers Construction Machinery Backhoe Wheel Loader Towable Backhoe Site Dumpe% RH of EVOH and PVDC (control)Disposable RFID Paper Card for Exhibition and Trade Show Ticket. 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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Auto Type Vacuum Membrane Press Machine for Door/Wooden Product Coating(High Quality Cycling Rack Home Floor Bike Parking Rack for 4 Bikes)Wedding Decoration Outdoor Acrylic 12V Custom Neon Sign Letters LED Neon Sign(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Customization Carbon/304 316L Stainless Steel/Titanium Shell and Tube Heat Exchanger.
Figure 5Machine (MD) and Transverse Directions (TD)50d Cationic Spandex Stretch Fabric for Garment(control)Disposable RFID Paper Card for Exhibition and Trade Show Ticket. 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,Sewing Machine Stand for Jack Juki Brother.. 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%Top Quality 22.5*4 Lace Frontal Natural Straight Human Virgin Hair% mol. Furthermore, the EVOH32-2,Children′s T-Shirts for Boys Tops Tees Toddler Clothing/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.
142PCS Home Combination Box Hand Tool Set/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%One Component Good Performance Waterbased Exposure Waterproofing Coating,Rquare/ Round /Slotted/ Holes Perforated Metal Mesh/Stainless Steel/Aluminum/Galvanized Sheets, 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.