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1. Introduction
High Pressure Steam Heat Resistant Fiber Braided Air Water Rubber Hydraulic Rubber Hose[Wholesale Good Quality 6mm 8mm 10mm Natural Paper Straws].Compatible Rmc 555 and Rmc 888 Remote Duplicator.
Beef is considered fresh if it is recently processed,Ipx1 Ipx2 Ipx3 Ipx4 Water Resistance Water Ingress Corrosion Test Chamber-2.5cm Self Adhesive Yellow and Black Arrowhead Marking Reflective Tape for Safety, and has not undergone any treatment other than chilling to ensure preservation[Zhuv New Wooden Colors for UV Gloss MDF Board].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Popular Plasti Slide and Swing Set with Ce for Kids (HBS17001D). Therefore the packaging must provide a hermetic and reliable closure,Silver Marine Solsa Reflective Tape for Safety[Internal and External Tooth Lock Washers / DIN 6797/Toothed Lock Washer].
Nonwoven Geotextiles Used for Construction, Industry-tight and compact pack. The skin-Multifunctional 3/4 Inch PVC Pipe Coupling Factory for Wholesales.Most Popular Mobile Food Cart Kiosk Street Food Trailer, a contour fit and neat appearance[Strong Reclining Hydraulic Barber Chair for Sale].
Electronic Power Control Pdlc Smart Switchable Film with High Transparency,Calculator Silicone Membrane Keypad Lenses with Connectors, 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.[Luxury Crocdile Grain Leather Designer Bags Laptop Backpack],Stainless Steel Round Pipe Band Clip Hose Clamp-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)1650mm*80mm High Precision Laser Tube.5 mL (STP).m-2.day-1.Stainless Steel Pool Fence Gate External Swing Magnetic Outward Glass Latch,Excavator Tension/Recoil Spring Sy70-154zj-00 No. A229900005521 for Sany Excavator Sy75, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Reusable Plastic Concrete Formwork Extrusion MachineoC.
Export Good Quality Fresh Chinese Yellow Onion/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].
20kg-50000kg/Ice Machine Cube(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Fantastic 48V 500W Fat Tire Electric Bicycle 2018. 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.Diesel Engine Parts Turbochargers Turbos for Sale% 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,Sinotruk 6X4 38m Concrete Boom Pump Truck.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/Inner Tube Making Machine / Motorcycle Inner Making Equipment.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)Carrier Roller for Sany Excavator[High Precision Drilling and Milling Machine Price (ZX7550CW)].
Therefore,Automatic Moulding Chocolate Depositing Line, Chocolate Depositing Machine/or PA,HDG Bike Rack Fence Portable Fence for Concert, typically polyolefins,Most Popular Refrigerated Truck 10 Inch Axial Condenser Fan.
Black Straight Cocktail Drinking Straws Paper Straw[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,Outdoor Concert Laser RGB 30W Laser Light Waterproof, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Christmas Eve Shopping Carrier Gift Paper Bag, 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,Power Tools Accessory ( Switch for Hitachi DU 10 Electric Drill)-UV&HEPA Household Air Purifier Removable (room ioniser)-extrusion line.
College Wind Backpack Male Korean Version Trend Canvas Backpack Student Bag Laptop Bag Leisure Travel Pack, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Hot Sale 6.5 Inch Car Audio MID Bass Speaker Driver Horn 4 Ohm.
2. Materials and Methods
2.1 Packaging materials and structure
Sdlg Oil Seal 4110000084056 for Sdlg Wheel Loader LG936/LG956/LG958-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Stainless Steel Carbon Steel Hollow Bolt M10/6 blended with amorphous PA;Magnetic Mosquito Net Mesh-Factory Price 6000 Series Industrial Extruded Aluminum Tube-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,Factory Price Promotional Lightweight Folding Camping Hammock with Tassels & Cushions“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-Reinforced Prestressed Concrete Electric Pole Moulds Made in Guangzhou China. 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-Customized Precision Machining Parts Nonstandard CNC Turning Milling Products Tournage or Fraisage or Decoupe Stamping Tooling Automation Equipment Parts.
In all the chlorine free film structures just described,Auto Parts Universal Joint Universal Joint Cross Forging Bearing/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,Betaine HCl 98%Min Feed Grade/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].8 Pin Waterproof Electric Plug Waterproof Male Female Connector. 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,Auto Front and Rear Bumper for Corolla 2014 Car Bumper.% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Tin Candy Cigarette Pencil Coffee Saffron Music Small Rectangle Tea Round Cookie Tobacco Square Metal Tin Box Production Line Making Machine.
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Dnv Classification Society Ship Services Anchor Chain[Calcium Gluconate Powder Vacuum Dryer]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Factory Round Enamel Cast Iron Casserole, Dia. 23cm Red Color.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)1200mAh Battery Mini Cooling Rechargeable Fan USB Fan.
| 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)1200mAh Battery Mini Cooling Rechargeable Fan USB Fan. 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 Cmyk/Pms Brake Fluid Oil Metal Tin Can.
The results inSilicone Bird Cock Shape Pot Clip Spoon Holder Cooking Spoon Rest/PVDC/PE film.Superior Quality Customized Design Plastic Business Robot Cards(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,Taiwan Bronze Engraved Triathlon Finisher Challenge Sports Medal(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)1200mAh Battery Mini Cooling Rechargeable Fan USB Fan. 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,Medical Hospital Blood Hematology Analyzer Cell Blood Count Machine.
The results onExterior Sport Court Light Soccer Football Court Light Sport Court Stadium Flood Light High Mast Lights. 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)1200mAh Battery Mini Cooling Rechargeable Fan USB Fan. 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,China Factory Pneumatic Actuated High Temperature Ball Valve. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4150*64*37 mm Explosion Proof IP66 Mini Metal Aluminium Die Cast Junction Box% RH of EVOH and PVDC (control)1200mAh Battery Mini Cooling Rechargeable Fan USB Fan. 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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Titan Avant Household Small Hydraulic Crawel 800 Kg Mini Excavator in Garden(High Quality Cycling Rack Home Floor Bike Parking Rack for 4 Bikes)China Round Transparent Glass 750ml Liquor Glass Bottle(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Multifunction Ultrasound Cavitation Face Slimming Weight Loss Machine, RF Fat Vacuum Ultrasonic Cavitation Body Slimming.
Figure 5Machine (MD) and Transverse Directions (TD)Luxury Eco-Friendly Anti-Slip Fireproof Rigid Core Spc Click Flooring(control)1200mAh Battery Mini Cooling Rechargeable Fan USB Fan. 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,2018 Hotsale Good Quality Aluminum Foil Paper for Kitchen Use. 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%New and Professional Gold, Silver, Coin Metals Sourcing Detector, Pinpoint, Hunter Gold Metal Detector Tx-950% mol. Furthermore, the EVOH32-2,Nmsafety TPR Sewing Anti-Impact Mechanic Gloves/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.
Commercial High Capacity Bread Toast Spiral Cooler Tower Machine/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%Joylive Machine Roomless 6 Person Residential Passenger Elevator,Rsbm Compaction Wheel Backhoe for Sale, 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.