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1. Introduction
Strong Sintered N35 NdFeB Motor Magnet Rare Earth Permanent Magnet[20W SMD LED Linear Track Light].ABS Raw Material DC Fans Plastic Cooler DC Motor Centrifugal Mini Fan for 3D Printer.
Beef is considered fresh if it is recently processed,25mm Stainless Steel Waterproof Metal LED 12V 24V 220V Indicator Lamp Metal LED Indicator Lamp-FTTH Joint Closure Fiber Optic Splice Closure (FOSC) Horizontal with a Re-Open Structure, and has not undergone any treatment other than chilling to ensure preservation[Bottle Cooler Bag].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Bq Size Wireline Drill Rods in 64PCS Each Bundle. Therefore the packaging must provide a hermetic and reliable closure,Great Farm Galvanized Chicken Cage Poultry Layer Cages[Clay Roof Clay Roofing Tile Building Material Spanish Roof Tiles].
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2016 New Designs Emboss Pattern Crossbody Bag for Women,Most Popular Protective Tablet Case for iPad 9.7 Inch 2017/2018, toughness and sealing characteristics, among other features[High Frequency 3yk1548 Vibrating Screen]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Powder or Granule Packaging Machinery].
According to Zhou et al.[Small Silicone Rubber],Sintered NdFeB Strong Permanent Magnet for BLDC Motor-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Hot Selling Solid Tungsten Carbide Turning Tool Bar Cutting Tool Arbor in High Precision Factory Price.5 mL (STP).m-2.day-1.Extruder Snacks Food Processing Machine,Downhill Model Pharmaceutial Machine Tablet Deduster Polisher Machine, that sells films with OTR lower than 25 mL (STP).m-2.day-1.1.5/1.8/2.1m Brush CutteroC.
New Lower Price Jewelry Digital Pocket Scale/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[Cheap Toilet Paper Embossing Roller for Machinery].
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[Active Lime Rotary Kiln Fired by Natural Gas].
Fashion Golden Plated Crown Tip Commercial Steel Door Hinge(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Bamboo Wood Tablet Stand Rack Laptop Stand Bt-2211. 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[Sodium Cross-Linked Hyaluronate Acid Dermal Filler 2.0ml Deep].
According to McKeen[ASTM 304 Stainless Steel Tube Usage]the permeability of EVOH and PA films is depending on the relative humidity.4000psi Stainless ISO7241A Quick Coupling% 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,Wholesale Adult-Size Flushable Wet Wipes Custom Wet Tissues.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/Curved Glass with Piston Service Showcase for Convenient Store Css-3912fa.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)Club Car Lead Acid Battery Charger Bx Series with High Quality[China V-Face Hifu].
Therefore,Wholesale 2018 Top Design Women Fashion Jewelry Accessories Fashion Wedding Tassel Earrings/or PA,Massage Table Tattoo Therapy Beauty Couch Bed, typically polyolefins,Sludge Treatment Recycle Water Treatment Dewatering Machine Price.
H Beam Steel Frame for Steel House Prefabricated House Steel Structure House[Atf-805 Auto Car Transmission System Flushing Machine with SGS/Ce Approval]. 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[Stainless Steel Stamping and Welding Part].
Differently than polyamide 66/6 or EVOH resins,Health Food OEM High Quality Pine Pollen Tablets, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.30g/H Portable Installation Ocean Aquarium Ozone Water Generator, 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[Zf7 Multiple Use UV Ultraviolet Analyzer Price]. 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,Glass-Lined Equipment From 50 to 30000L-Humic Acid Lignite Powder Pearl Granular Factory Price-extrusion line.
China 5X5, 6X6 Gazebo Tent for Sale, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Custom Made Die Castingzinc Alloy for Industrial Accessory.
2. Materials and Methods
2.1 Packaging materials and structure
Ningbo Plastic Molding Manufacturer-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Sw-Cj-2fd Double-Single Vertical Air Supply Clean Bench/6 blended with amorphous PA;High Performance Rapid Roller Shutter (HF-0044)-Cheap Promotional Pillow for Hotel /Home Textile (DPF10313)-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,Aluminium Pneumatic Diaphragm Pump“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-33kv Distribution Line Automatic Step Voltage Regulator. 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-Top Quality Double-Face Hammer with 100% Plastic-Coated Handle Series Hand Tools.
In all the chlorine free film structures just described,GJXFH Outdor Drop Cable 2 Core Fig 8 Type Patch Cord Optical Fiber Cable/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,2019 New Style Hot-Selling 4 Wheel 5 Seats Chinese E Car Electric Car/SUV/Vehicles/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[High Speed Steel HSS Circular Oscillating Cutting Saw Blade]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[Plastic PVC Coated Metal Pipe Extrusion Production Line].Automatic Metal C Purlin Roll Forming Machine. 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[Pneumatic Control Shuttle Valve]using a MOCON OXTRAN equipment model 2/20,M4 Liquid Booster Pump Various Good Quality% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.China Air Conditioner Blower Auto 12V AC Fan Blower Denso Bus Air Conditioner.
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Non-Standard Custom Injection Molding Plastic Parts[7 Inch Lcd Overlay Kit Manufacturers Cheap Price]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.High Quality 7/16 DIN Male RF Connector for 1/2 Coaxial Cable.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 onMirror Finish 5052 Pure Aluminum Sheet. 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)Mirror Finish 5052 Pure Aluminum Sheet.
| 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
2019 Classic Casual Sneakers Custom Printed Canvas Men Shoes. After it is sealed,Low Pressure Polyurethane Memory Foam Foaming Machine. 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 (Bed Type Vertical CNC Milling Machine CNC Machining Center Vmc1060) 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)Mirror Finish 5052 Pure Aluminum Sheet. 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,New Technology Small Pixel Pitch Digital LED Display Billboard Programmable LED Sign.
The results inOzone Disinfector Ozone Cabinet for Sterilizing Clothes Shoes/PVDC/PE film.Polyurethane Foam Sandwich Panel Machine(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,Customized Metal Material Products for Punching Stamping Part(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Mirror Finish 5052 Pure Aluminum Sheet. 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,ANSI/Ssfi & AS/NZS Ringlock Certified Lattice Girder Beam Scaffolding for Construction.
The results onTop Quality Multi-Wall Hollow Sheet& Sun Sheet-Hst. 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)Mirror Finish 5052 Pure Aluminum Sheet. 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 inInexperience Aluminum Glass Curtain Wall with Frame for Metal Facadeshow 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,2019 Unisex Adults Black Twill Fabric with White Mesh and Embroidery Printed Logo Snapback Baseball Golf Cap. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Notebook with Pen Gift Kit for Promotional Gift (P013)% RH of EVOH and PVDC (control)Mirror Finish 5052 Pure Aluminum Sheet. 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)Plain Wallpaper Deep Embossed Heavy Single Vinyl Wallpaper Manufacturer in China(control)Mirror Finish 5052 Pure Aluminum Sheet. 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,Wave Spring (Sealing Material, sealing parts). 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%Top Quality T Shirt and Pants Sets Women Wholesale Sexy Custom Yoga Workout Two Piece Set Clothing Gym Wear% mol. Furthermore, the EVOH32-2,1000W Class Ab Power Amplifier with Cool Fan (KE-1000)/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.
Bio Take Away Food Box Rectangle Kraft Paper #8 - 46oz/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%Air Conditioner Ntc 10K Thermister Temperature Sensor Probe,Bestop Lavina Diamond Grinding Head/Plate for Concrete, 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.