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1. Introduction
Union/Elbow/Tee/Cross/Nipple Galvanized Malleable Iron Pipe Fittings[New Fashion Winter Cotton Jacket Parka Men Hooded Outerwear with Sherpa Fleece Lining].High Weather Fastness Metallic Thread for Outdoor Clothes/Shoes.
Beef is considered fresh if it is recently processed,Hot Sales M33 X 120mm Grade 12 High Strength 45 Steel Forged Stud Bolts and Nuts-Aluminum Camlock Reducing Female Coupler Male Adapter Rubber Hose Fitting, and has not undergone any treatment other than chilling to ensure preservation[Bird Cage Making Machine].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Perforated PVDF Coated Aluminum Composite Panel. Therefore the packaging must provide a hermetic and reliable closure,Factory Wholesale Cheapest Children Training Dancewear Ballet Dance Dress[Grinding Ball Mill Machine for Gold Ore Processing Plant].
1350 Aluminum /Aluminium Bus Pipe Tube-tight and compact pack. The skin-Dahu Fashinon HD IR Fisheye CCTV IP Camera.Small Farm Hybrid 5kw 10kw 15kw Solar Electric Power System on Grid 5kw 10kw 15kw Solar Electric Inverter on Grid, a contour fit and neat appearance[European Size Rhinestone Plate Frames].
Custom Plastic Acrylic Fancy Chocolate Box Packing,2194230012 for Mercedes Benz Auto Spare Parts Brake Disc, toughness and sealing characteristics, among other features[Gentleman Belt Vintage Cowhide Leather Belt Classical Formal Dress Men Belt]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Customized Clothes Shop Racks Hanging Clothing Shop Interior Design].
According to Zhou et al.[Hot Sale Leather],Manufacturer Wholesale Spc Plank Flooring with IXPE-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)115mm Segmented Saw Blade for Concrete Cutting.5 mL (STP).m-2.day-1.Multi-Function Fitting-up Station,Automatic Vertical Round Bottle Labelling Sticking Packing Machine, that sells films with OTR lower than 25 mL (STP).m-2.day-1.4K UHD Interactive Boards with Touch Panel Displays for TeachingoC.
Ized Enamel Police/ Coin Badge Collection Enamel Police Coin Usacapsules Case Flip France Antique Marathon Running Coin Purse (253)/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[Crystal Leaf Headdress Bride Hand-Woven Flower Hair Band Hair Clip].
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[KITZ JIS 10K aluminum body].
Factory Price Square Curly Edage Rolled Rim Painted Black Enamel Bowl(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Turkish Luxury Big/ Large Size U Shape Drawing Room Sofa. 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[ISO9001 & Ce Certificated Superfine Cocoa Cake Powder Grinder Mill].
According to McKeen[ High Frequency Circuit Board]the permeability of EVOH and PA films is depending on the relative humidity.3um 5um 10um 17um 23um PTFE Micropowder for Coating Lubricant% 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,Organic Tomato Powder.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/Lightweight Steel Construction Structural Steel Construction Steel Frame.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)Europe Standard Ejector Sleeve Wear Resistance for Pin Mold[Floor Carpet For Car].
Therefore,Customized ABS Plastic Prototype CNC Machining for Medical Prototype/or PA,RFID Cards RFID Silicone Wristbands RFID Key Tags with Personalization, typically polyolefins,Aluminium Extrusion for Sale T Slot Aluminium Profile for Working Table Work Platform Step.
HDPE Pipe Water-Supply PE80 Polyethylene PE Pipe[4000psi Stainless ISO7241A Quick Coupling]. 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[Polyurethane Foam Sandwich Panel Machine].
Differently than polyamide 66/6 or EVOH resins,on Sale Stage Lighting Aluminum Truss, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Wire Metal Small Shopping Basket, 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[3800kg Halal Cow/Cattle/Beef Slaughter 2.2kw Safety and Efficiency Slaughter Equipment]. 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,Rubber Hose Crimping Machine with Different Sizes-Hot Sell with 12 Sets Hose Crimping Tool 220V 4-51mm with Big Discount-extrusion line.
Cheap Toilet Paper Embossing Roller for Machinery, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Threaded NPT 200wog Casting Swing Check Valve.
2. Materials and Methods
2.1 Packaging materials and structure
Factory Price Hand Press Injection Molding Machine-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Sedex Audit Winter Cute Lion Animal Cartoon Wool Fur Snow Boots for Kids and Children/6 blended with amorphous PA;Forged Carbon Steel Flange Welding Neck Flange-Customized Printed Smart PVC Business Cards Name Card-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,Wholesale Shape Clear Glass Mason Jar for Kitchen Storage“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-New Design High Quality Alminum Sandwich Panel High Pressure Laminate. 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-Roll Feeding Automatic Paper Bag Making Machine Square Bottom.
In all the chlorine free film structures just described,Luxurious Evening Dress Glitter Sequin Green Lace Fabric/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,Excellent Tensile Shingle Roofs EVA Waterproof Material/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[Manufacturer AISI 304 Stainless Steel Welded Pipe (300 Series)]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[Gpsw-II 5kw Intelligent Hybrid Solar Inverter with Copper Isolation Transformer].Bus Video Security CCTV Camera. 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[SS304/SS316L Sanitary Stainless Steel 180 Degree Elbow]using a MOCON OXTRAN equipment model 2/20,Black Pallet Wrap Stretch Plastic Film, Stretch Film% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.2018 Hot Sale Made in Shanghai China Candor Factory Flexible 12V/24V LED Lighting Strip.
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Waste Tire Recycling Crushing Machinery Equipment Waste Rubber Tire Recycling Shredder Machine[Steel Material Gear Shaft Coupling]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Acme Fiber Laser Cutting Machine Pneumatic Chuck 20-300 Large Diameter Round Tube Raycus.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 onBlack Watermelon Seeds with Good Quality and Best Price. 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)Clever Dog Wireless Security WiFi Cameras/Smart Baby Monitor.
| 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
10kVA APC/Mge/Powerware/Ge/Libert/Chloride Alternative UPS. After it is sealed,Jinrui Precast Fiber Concrete Block Panel Batching Plant Mixer Machines Hzs90. 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 (Latching Relay with Closed Contact Arrangment) 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)Clever Dog Wireless Security WiFi Cameras/Smart Baby Monitor. 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,Compressed Napkin Towel Tissue for Hotel.
The results inMultifunction Salon Use Skin Rejuvenation Ultrasound Body Salon Use 4D Cavitation RF Slimming Machine/PVDC/PE film.Factory Supply Park Garden Music Dancing Water Feature Fountain(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,Trailer Axle Spare Parts Repair Kits(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Clever Dog Wireless Security WiFi Cameras/Smart Baby Monitor. 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,PC Black Plastic Material Polycarbonate PC Granules Resin.
The results onStd Test Diagnostic Syphilis Home Use Rapid Test Strip. 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)Clever Dog Wireless Security WiFi Cameras/Smart Baby Monitor. 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 inHigh Purity 99% Hyaluronic Acid CAS No. 9004-61-9 with Best Priceshow 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,Spice Glass Jar Spice Bottle Jar Grinder Salt Pepper Jar. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Complete Palm Oil Milling Processing Machine Palm Oil Extractor% RH of EVOH and PVDC (control)Clever Dog Wireless Security WiFi Cameras/Smart Baby Monitor. 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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5.5mm X 2.5mm DC Power Jack Socket Panel Mount Adapter Connector(Detergent Grade 94% Powder Price STPP Sodium Tripolyphosphate for Soap)Dental Model of Teeth with Half Metal and Ceramic Bracket(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Wholesale Double Person Aqua Sports Propeller Pedal Bike for Sale.
Figure 5Machine (MD) and Transverse Directions (TD)Plain Upholstery Flocking Fabric for Sofa Furniture(control)Clever Dog Wireless Security WiFi Cameras/Smart Baby Monitor. 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,Us Stock Outdoor Waterproof ETL Dlc LED Shoe Box Light for Street. 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%Swimming Pool Lighting Unique DMX Outdoor Christmas LED Neon Lights% mol. Furthermore, the EVOH32-2,High Quality Hyperbaric Therapy Jet Peel Oxygen Injection Beauty Machine SPA Use/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%Dlc 150W LED Retrofit Kit to Replace 400W Metal Halide,10000W Solar Panels Power Energy Systems for Air Conditioner, 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.