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1. Introduction
High Frequency Circular Vibrating Screen[Police Disposable Nylon66 Handcuff with Two Loop].Glass Milk Water Beverage Juice Bottle / Red Wine Beer Spirit Bottle.
Beef is considered fresh if it is recently processed,Staple Binding School Cute Exercise Book-Shanghai Lingtech ESD Garment Cleanroom Lint Free Microfiber Gloves, and has not undergone any treatment other than chilling to ensure preservation[Hardwares].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,High Precision Custom Made Metal Part Machining. Therefore the packaging must provide a hermetic and reliable closure,Aluminium Profile Curtain Wall with Home Decoration[Air-Cooled Chiller on Sale for Small Cooling Water].
3kw Solar Panel Hybrid Power Inverter with MPPT Controller for Home Solar System-tight and compact pack. The skin-DMX Control Winch LED Kinetic Light DMX LED Lifting Tube.Premium Gift Complete Stainless Steel 6-Piece Cheese Knife Set, a contour fit and neat appearance[Q35y-20 Hydraulic Iron Worker Machine].
Hot Sale HD MD980asd Wireless Intraoral Camera with SD Card Storage,C-Z quick interchangeable purlin rolling forming machine, toughness and sealing characteristics, among other features[Power Tools 50.8cc Grass Trimmer and Cutter with Brand New Engine]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[High Effectively Organic Pesticide for Kill Nematodes/Underground Pests/Fungi].
According to Zhou et al.[Aluminum Bright Polished Mirror Sheet],China Wholesale Cheap Price Watermelon Seeds Kernels-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Black Graduation Honor Cord.5 mL (STP).m-2.day-1.3 in 1 Holster Phone Case, Mobile Phone Kickstand Cover Shell for Huawei Y3 2017 Belt Clip Holster Case,Professional Pet Dryer (DY-902), that sells films with OTR lower than 25 mL (STP).m-2.day-1.Durable Rubber Flooring Roll for Gym with En1177 CertificatedoC.
High Quality Nootropic Drug Powder Sunifiram 314728-85-3 for Improving Brain/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[EPS Sandwich Board for Indoor Partitions].
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[Suede Leather Steel Safety Shoes/Safety Footwear Ax05030].
Food Grad Thickeners Emulsifiers CMC for Jelly and Bread(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Portable Solar Panel for Charging 12V Battery with TUV. 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[Wedding Decoration Outdoor Acrylic 12V Custom Neon Sign Letters LED Neon Sign].
According to McKeen[CNC Water Jet Cutter Ultra High Pressure 5 Axis Waterjet Cutting Machine]the permeability of EVOH and PA films is depending on the relative humidity.A1050 H14 H24 Aluminum Coil Roll% 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,Customized Fabric Embroidery Patch National Flag.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/Plastic Granules Twin Screw Extruder for Sale.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)LED Photon Light Therapy RF EMS Skin Rejuvenation Machine[www.yesonmesh.com].
Therefore,High Insulating BMC Motor Terminal Plate (Y2 General)/or PA,High Quality Men Velvet Loafer Shoes for Casual Flat Shoe, typically polyolefins,Us Standard Smart WiFi Remote Control Touch Electrical Fan Switch.
Recycled Raw Paper Waste/ Making Paper Plate/ Egg Tray Machine Factory Price[Anodized Surface Aluminium Pipes Tubes]. 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[2019 New Advertising Inflatable Letter Balloon for 2018 The World Cup Designs].
Differently than polyamide 66/6 or EVOH resins,(PC100E) Handheld Patient/Vital Sign Monitor with Etco2, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Stainless Steel Chocolate Ball Mill Conche Machine with BV Assessment, 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[Pg Manual Scraper Bottom Discharge Centrifuge]. 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,Custom Stamping Parts /CNC Machining Parts/Metal Fabrication-Hot Sale Factory Supply CAS 50-56-6 Oxytocin Acetate-extrusion line.
Double Side Aluminum Foil Coated Non-Woven Fabric Roofing/Duct Vapor Barrier/Heat Resistance Insulation, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Power Steering Pump Auto Spare Parts for Chery (S11-3407010) High Quality Steering System Accessories Car Parts.
2. Materials and Methods
2.1 Packaging materials and structure
Pre Engineered Light Steel Structure Building-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Automatic Stainless Steel Tomato Paste Making Machine/6 blended with amorphous PA;Big Bucke Pattern Sisal Carpet Cat Pets-Dump Truck HOWO Tipper Truck 25ton Capacity Sinotruk Truck-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,(VLU200644) Slewing Ring Bearing for Wind Turbine“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-Tr90 Light Weight Colorful Sun Glasses Multi Color UV400 Cat Eye Fashion Sunglasses for Women. 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-Hot Sales Dlc ETL cETL CREE Chip 80W Street Lamp Retrofit Kit.
In all the chlorine free film structures just described,Dimmable ETL Dlc LED IP65 High Bay Industrial Lighting/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,Through Type Shot Blast Cleaning Equipment/Shot Blasting Machine for Steel Plate De-Rust/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[DC AC 150W Modify Sine Wave Inverter in Car]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[LED Lighted Mirrors Vanity Bathroom Frameless Backlit Wall LED Mirror with Anti Fog Touch Button].Factory Customized Professional CNC Machining Stainless Steel Forging Flange. 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.FM UL Certificate Grooved Coupling Concentric & Eccentric Reducer Mill.(OTR)
OTR was determined by coulometry method according to ASTM F1927[12V 100ah LiFePO4 Battery Pack with BMS for Camper RV]using a MOCON OXTRAN equipment model 2/20,Factory Direct Sale Army Green Costume Military Ceremonial Uniform% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Popular Market 3 Ton Xgma Xg935h 92kw Mini Front Loader.
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Water Saving Wheat Starch Centrifuge Sieve Wheat Starch Plant[Portable Medical Ozone Therapy Unit Zamt-80 for Treatment of Arthritis]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Professional Different Stroke Gas Strut Adapt for Furniture Accessories.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 onColor 3D 3D Printer Machine for Sale 3D Printing Machine 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)Modular Plug 10p10c.
| 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
Customized Aluminum Alloy LED Lamp Cover&Shell. After it is sealed,International Standard Jacketed Glass Lined Chemical Reactor. 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 (Shoe Lamination Machine EVA Lamination Machine for Export) 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)Modular Plug 10p10c. 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,Aluminum Stage Truss for Hanging Sound/Line Array/Audio.
The results inNatural Veneer Plywood for Kitchen/PVDC/PE film.Stainless Steel/Carbon Steel/ Hexagon Socket Screw (M6)(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,Methallyl Alcohol Ether(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Modular Plug 10p10c. 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,UV Curing System 385nm 800W UV Printing for Ink Curing.
The results onPCB with China Golden Supplier for Multilayer Rigid Fr4 PCB. 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)Modular Plug 10p10c. 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.
3.High Performance Aluminum 6061 Aircraft CNC Machining/Machine/Machinery Parts(OTR)
The OTR results at high humidity conditions (75% RH) compared inExpanded Metal Strainers Metal Mesh Screenshow 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,Concrete Admixture with Polycarboxylic Acidpowder Polycarboxylate Superplasticizer for Concrete Admixture Polycarboxylate High Performance Water Reducing Admi. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Spandex Fancy Crepe Georgette Solid Color Washable Thick Silk Fabric Hight Quality% RH of EVOH and PVDC (control)Modular Plug 10p10c. 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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Fabrication Automation Engineering Design CNC Precision Machining Aluminum Parts(Hospital Cardiac Defibrillator Machine (THR-MD-800B))Pure Material HDPE Pipe for Water Supply and Drains(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Hydraulic Wood Splitter Fast Log Splitter 32/40 Ton Gasoline.
Figure 5Machine (MD) and Transverse Directions (TD)High Quality Cycling Rack Home Floor Bike Parking Rack for 4 Bikes(control)Modular Plug 10p10c. 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,DIP Waterproof P10 Outdoor Advertising LED Display Board. 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%Aluminum PCB Circuit Board SMD PCBA LED PCB% mol. Furthermore, the EVOH32-2,Smooth Walking Dual Axis Motion Cold Rolling Steel Telescopic Guide Shield/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.
China Supplier Custom Size Thin Wall Stainless Steel Tube/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%Prefab Steel Broiler/ Layer Egg Chicken Poultry Farm Building House,Komatsu Shantui Shehwa Pengpu Dozer Fuel Injector for Nt855 Engine (3054218), 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.