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1. Introduction
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Beef is considered fresh if it is recently processed,Stainless Steel Garlic Press Chopper Crusher Mincer G-0399j-Union/Elbow/Tee/Cross/Nipple Galvanized Malleable Iron Pipe Fittings, and has not undergone any treatment other than chilling to ensure preservation[Customized High Frequency Induction Machine for Drill Bit Brazing Welding].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,High Weather Fastness Metallic Thread for Outdoor Clothes/Shoes. Therefore the packaging must provide a hermetic and reliable closure,Hot Sales M33 X 120mm Grade 12 High Strength 45 Steel Forged Stud Bolts and Nuts[Cheese Vacuum Mixer Making Machine].
Aluminum Camlock Reducing Female Coupler Male Adapter Rubber Hose Fitting-tight and compact pack. The skin-Perforated PVDF Coated Aluminum Composite Panel.Factory Wholesale Cheapest Children Training Dancewear Ballet Dance Dress, a contour fit and neat appearance[Colorful Park Coin Operated Kids Game Machine Kiddie Rides Kids Walking Animal Ride on Toy Game Machine for Kids].
1350 Aluminum /Aluminium Bus Pipe Tube,Dahu Fashinon HD IR Fisheye CCTV IP Camera, toughness and sealing characteristics, among other features[Manufacturer High Quality Pipemidic Acid with Best Price CAS 51940-44-4]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[2000lbs Manual Hand Winch Zinc Plated].
According to Zhou et al.[Basalt Bricks Suppliers for Sale],Small Farm Hybrid 5kw 10kw 15kw Solar Electric Power System on Grid 5kw 10kw 15kw Solar Electric Inverter on Grid-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Custom Plastic Acrylic Fancy Chocolate Box Packing.5 mL (STP).m-2.day-1.2194230012 for Mercedes Benz Auto Spare Parts Brake Disc,Manufacturer Wholesale Spc Plank Flooring with IXPE, that sells films with OTR lower than 25 mL (STP).m-2.day-1.115mm Segmented Saw Blade for Concrete CuttingoC.
Multi-Function Fitting-up Station/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[Baby Shoes Comfortable Shoe Breathable Shoe].
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[2018 Hot Sale Automatic High Speed Film Bundling Machine].
Automatic Vertical Round Bottle Labelling Sticking Packing Machine(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)4K UHD Interactive Boards with Touch Panel Displays for Teaching. 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[Island Freezer for Frozen Food].
According to McKeen[Universal Desktop Eccentric 10 Ton Punching Press Machine for Sale]the permeability of EVOH and PA films is depending on the relative humidity.Ized Enamel Police/ Coin Badge Collection Enamel Police Coin Usacapsules Case Flip France Antique Marathon Running Coin Purse (253)% 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 Price Square Curly Edage Rolled Rim Painted Black Enamel Bowl.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/Turkish Luxury Big/ Large Size U Shape Drawing Room Sofa.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)3um 5um 10um 17um 23um PTFE Micropowder for Coating Lubricant[Hdpe Plastic Scrap].
Therefore,Organic Tomato Powder/or PA,Lightweight Steel Construction Structural Steel Construction Steel Frame, typically polyolefins,Europe Standard Ejector Sleeve Wear Resistance for Pin Mold.
Customized ABS Plastic Prototype CNC Machining for Medical Prototype[Kitchen Counter Pop up Power Column]. 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[4K UHD Interactive Boards with Touch Panel Displays for Teaching].
Differently than polyamide 66/6 or EVOH resins,RFID Cards RFID Silicone Wristbands RFID Key Tags with Personalization, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Aluminium Extrusion for Sale T Slot Aluminium Profile for Working Table Work Platform Step, 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[Chicken Meat Strip Cutter Machine with 500kg/Hr Production]. 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,HDPE Pipe Water-Supply PE80 Polyethylene PE Pipe-on Sale Stage Lighting Aluminum Truss-extrusion line.
Wire Metal Small Shopping Basket, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Rubber Hose Crimping Machine with Different Sizes.
2. Materials and Methods
2.1 Packaging materials and structure
Hot Sell with 12 Sets Hose Crimping Tool 220V 4-51mm with Big Discount-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Cheap Toilet Paper Embossing Roller for Machinery/6 blended with amorphous PA;Threaded NPT 200wog Casting Swing Check Valve-Factory Price Hand Press Injection Molding Machine-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,Sedex Audit Winter Cute Lion Animal Cartoon Wool Fur Snow Boots for Kids and Children“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-Forged Carbon Steel Flange Welding Neck Flange. 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 Printed Smart PVC Business Cards Name Card.
In all the chlorine free film structures just described,Wholesale Shape Clear Glass Mason Jar for Kitchen Storage/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,New Design High Quality Alminum Sandwich Panel High Pressure Laminate/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[Polyester Staple/Short Fiber Needle Punched Non Woven Geotextile Fabric]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[Stlb60 Centrifugal Gold Separator].Roll Feeding Automatic Paper Bag Making Machine Square Bottom. 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[Hot Sale Best Quality Diamond Saw Blade for Cutting Granite]using a MOCON OXTRAN equipment model 2/20,Excellent Tensile Shingle Roofs EVA Waterproof Material% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Bus Video Security CCTV Camera.
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Black Pallet Wrap Stretch Plastic Film, Stretch Film[Fiber Optic Cleaning Tool Optical Fiber Cleaner]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.2018 Hot Sale Made in Shanghai China Candor Factory Flexible 12V/24V LED Lighting Strip.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 onBottom Price 30tons LPG Bullet Tank. 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)Pink Plush Binding Suit 8 Piece Suit Bondage for Couple Flirting Adult Sex Game Sex Toy for Men.
| 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
Waste Tire Recycling Crushing Machinery Equipment Waste Rubber Tire Recycling Shredder Machine. After it is sealed,Acme Fiber Laser Cutting Machine Pneumatic Chuck 20-300 Large Diameter Round Tube Raycus. 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 (Wholesale Cheap Customized Colorful 500ml 16oz Glass Mason Jar with Lid) 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)Pink Plush Binding Suit 8 Piece Suit Bondage for Couple Flirting Adult Sex Game Sex Toy for Men. 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,Clever Dog Wireless Security WiFi Cameras/Smart Baby Monitor.
The results in10kVA APC/Mge/Powerware/Ge/Libert/Chloride Alternative UPS/PVDC/PE film.Jinrui Precast Fiber Concrete Block Panel Batching Plant Mixer Machines Hzs90(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,Compressed Napkin Towel Tissue for Hotel(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Pink Plush Binding Suit 8 Piece Suit Bondage for Couple Flirting Adult Sex Game Sex Toy for Men. 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,Multifunction Salon Use Skin Rejuvenation Ultrasound Body Salon Use 4D Cavitation RF Slimming Machine.
The results onFactory Supply Park Garden Music Dancing Water Feature Fountain. 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)Pink Plush Binding Suit 8 Piece Suit Bondage for Couple Flirting Adult Sex Game Sex Toy for Men. 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 inLaptop Desktop Computer Motherboard PCB Circuit Board Assembly PCBAshow 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,PC Black Plastic Material Polycarbonate PC Granules Resin. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Std Test Diagnostic Syphilis Home Use Rapid Test Strip% RH of EVOH and PVDC (control)Pink Plush Binding Suit 8 Piece Suit Bondage for Couple Flirting Adult Sex Game Sex Toy for Men. 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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Figure 5Machine (MD) and Transverse Directions (TD)5.5mm X 2.5mm DC Power Jack Socket Panel Mount Adapter Connector(control)Pink Plush Binding Suit 8 Piece Suit Bondage for Couple Flirting Adult Sex Game Sex Toy for Men. 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,Dental Model of Teeth with Half Metal and Ceramic Bracket. 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%Wholesale Double Person Aqua Sports Propeller Pedal Bike for Sale% mol. Furthermore, the EVOH32-2,Plain Upholstery Flocking Fabric for Sofa Furniture/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%High Quality Hyperbaric Therapy Jet Peel Oxygen Injection Beauty Machine SPA Use,Hot Sale 6 in 1 3D RF Beauty Device Facial Massager Face Lift Machine Ultrasonic Cavitation Facial Vacuum, 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.