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1. Introduction
Hot Dipped Galvanized Zinc Coated Gi Wire Rod Gauge 8[Wholesale Good Quality 6mm 8mm 10mm Natural Paper Straws].Hypodermic Needle 18g Puncture Needle.
Beef is considered fresh if it is recently processed,Outdoor P8mm Full Color LED Advertising Display Sign-High Quality Handmade Glass Storage Mason Jar with Screw Lid, and has not undergone any treatment other than chilling to ensure preservation[1.25mm Pin Header High Quality Supplier].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,2 Way Mini 1/2′′ Dn15 Plastic Motorized Flow Control Ball Valve. Therefore the packaging must provide a hermetic and reliable closure,Hydro Wood Pellet Stove with Boiler /Jacket 20kw Free Standing Can Be Connected to Water Heating Radiators[Internal and External Tooth Lock Washers / DIN 6797/Toothed Lock Washer].
Good Quality Vertical Turret Milling Machine for Metal Processing Zx7550c-tight and compact pack. The skin-M16 Industrial Electric Auto Nuts Tapping Machine Cx-6532.CNC Metal Plastic Parts/Mechanical Precision Machining Parts/Stainless Steel/Aluminium Parts Machining/Machine Parts/CNC Turning/Milling/CNC Machining Part, a contour fit and neat appearance[Strong Reclining Hydraulic Barber Chair for Sale].
Low Density Cleaner for Paper Mills Pulping Line,Cosmetic Grade Sodium Hyaluronate Ha Power for Skin Moisturizing Product, 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.[Scalp Vein Set with Ce&ISO],1000mg Water and Air Ozone Generator Smoke Remover Purifier-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)High Frequency Circular Vibrating Screen.5 mL (STP).m-2.day-1.Glass Milk Water Beverage Juice Bottle / Red Wine Beer Spirit Bottle,Staple Binding School Cute Exercise Book, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Shanghai Lingtech ESD Garment Cleanroom Lint Free Microfiber GlovesoC.
High Precision Custom Made Metal Part Machining/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].
Aluminium Profile Curtain Wall with Home Decoration(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)3kw Solar Panel Hybrid Power Inverter with MPPT Controller for Home Solar System. 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.DMX Control Winch LED Kinetic Light DMX LED Lifting Tube% 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,Premium Gift Complete Stainless Steel 6-Piece Cheese Knife Set.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/Hot Sale HD MD980asd Wireless Intraoral Camera with SD Card Storage.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)C-Z quick interchangeable purlin rolling forming machine[Neodymium Magnet N52].
Therefore,China Wholesale Cheap Price Watermelon Seeds Kernels/or PA,Black Graduation Honor Cord, typically polyolefins,3 in 1 Holster Phone Case, Mobile Phone Kickstand Cover Shell for Huawei Y3 2017 Belt Clip Holster Case.
Professional Pet Dryer (DY-902)[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,Durable Rubber Flooring Roll for Gym with En1177 Certificated, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.High Quality Nootropic Drug Powder Sunifiram 314728-85-3 for Improving Brain, 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,Food Grad Thickeners Emulsifiers CMC for Jelly and Bread-Portable Solar Panel for Charging 12V Battery with TUV-extrusion line.
A1050 H14 H24 Aluminum Coil Roll, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Customized Fabric Embroidery Patch National Flag.
2. Materials and Methods
2.1 Packaging materials and structure
Plastic Granules Twin Screw Extruder for Sale-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;LED Photon Light Therapy RF EMS Skin Rejuvenation Machine/6 blended with amorphous PA;High Insulating BMC Motor Terminal Plate (Y2 General)-High Quality Men Velvet Loafer Shoes for Casual Flat Shoe-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,Us Standard Smart WiFi Remote Control Touch Electrical Fan Switch“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-Recycled Raw Paper Waste/ Making Paper Plate/ Egg Tray Machine Factory Price. 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-(PC100E) Handheld Patient/Vital Sign Monitor with Etco2.
In all the chlorine free film structures just described,Stainless Steel Chocolate Ball Mill Conche Machine with BV Assessment/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 Stamping Parts /CNC Machining Parts/Metal Fabrication/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].Hot Sale Factory Supply CAS 50-56-6 Oxytocin Acetate. 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.Double Side Aluminum Foil Coated Non-Woven Fabric Roofing/Duct Vapor Barrier/Heat Resistance Insulation(OTR)
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,Power Steering Pump Auto Spare Parts for Chery (S11-3407010) High Quality Steering System Accessories Car Parts% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Pre Engineered Light Steel Structure Building.
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Big Bucke Pattern Sisal Carpet Cat Pets[Palm Coated Nitrile Gloves]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Dump Truck HOWO Tipper Truck 25ton Capacity Sinotruk Truck.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)(VLU200644) Slewing Ring Bearing for Wind Turbine.
| 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
Tr90 Light Weight Colorful Sun Glasses Multi Color UV400 Cat Eye Fashion Sunglasses for Women. After it is sealed,Hot Sales Dlc ETL cETL CREE Chip 80W Street Lamp Retrofit Kit. 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)(VLU200644) Slewing Ring Bearing for Wind Turbine. 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,Dimmable ETL Dlc LED IP65 High Bay Industrial Lighting.
The results inThrough Type Shot Blast Cleaning Equipment/Shot Blasting Machine for Steel Plate De-Rust/PVDC/PE film.Factory Customized Professional CNC Machining Stainless Steel Forging Flange(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,FM UL Certificate Grooved Coupling Concentric & Eccentric Reducer Mill.(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)(VLU200644) Slewing Ring Bearing for Wind Turbine. 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,Factory Direct Sale Army Green Costume Military Ceremonial Uniform.
The results onPopular Market 3 Ton Xgma Xg935h 92kw Mini Front Loader. 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)(VLU200644) Slewing Ring Bearing for Wind Turbine. 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,Water Saving Wheat Starch Centrifuge Sieve Wheat Starch Plant. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Professional Different Stroke Gas Strut Adapt for Furniture Accessories% RH of EVOH and PVDC (control)(VLU200644) Slewing Ring Bearing for Wind Turbine. 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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Customized Aluminum Alloy LED Lamp Cover&Shell(High Quality Cycling Rack Home Floor Bike Parking Rack for 4 Bikes)International Standard Jacketed Glass Lined Chemical Reactor(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Aluminum Stage Truss for Hanging Sound/Line Array/Audio.
Figure 5Machine (MD) and Transverse Directions (TD)Natural Veneer Plywood for Kitchen(control)(VLU200644) Slewing Ring Bearing for Wind Turbine. 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,Stainless Steel/Carbon Steel/ Hexagon Socket Screw (M6). 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%Methallyl Alcohol Ether% mol. Furthermore, the EVOH32-2,UV Curing System 385nm 800W UV Printing for Ink Curing/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.
PCB with China Golden Supplier for Multilayer Rigid Fr4 PCB/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%Concrete Admixture with Polycarboxylic Acidpowder Polycarboxylate Superplasticizer for Concrete Admixture Polycarboxylate High Performance Water Reducing Admi,Spandex Fancy Crepe Georgette Solid Color Washable Thick Silk Fabric Hight Quality, 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.