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1. Introduction
Downhill Model Pharmaceutial Machine Tablet Deduster Polisher Machine[Gentleman Belt Vintage Cowhide Leather Belt Classical Formal Dress Men Belt].1.5/1.8/2.1m Brush Cutter.
Beef is considered fresh if it is recently processed,New Lower Price Jewelry Digital Pocket Scale-Fashion Golden Plated Crown Tip Commercial Steel Door Hinge, and has not undergone any treatment other than chilling to ensure preservation[FTTH Fiber Optic Fusion Splicing Toolkit].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Bamboo Wood Tablet Stand Rack Laptop Stand Bt-2211. Therefore the packaging must provide a hermetic and reliable closure,4000psi Stainless ISO7241A Quick Coupling[Customized Clothes Shop Racks Hanging Clothing Shop Interior Design].
Wholesale Adult-Size Flushable Wet Wipes Custom Wet Tissues-tight and compact pack. The skin-Curved Glass with Piston Service Showcase for Convenient Store Css-3912fa.Club Car Lead Acid Battery Charger Bx Series with High Quality, a contour fit and neat appearance[Crystal Leaf Headdress Bride Hand-Woven Flower Hair Band Hair Clip].
Wholesale 2018 Top Design Women Fashion Jewelry Accessories Fashion Wedding Tassel Earrings,Massage Table Tattoo Therapy Beauty Couch Bed, toughness and sealing characteristics, among other features[KITZ JIS 10K aluminum body]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[ISO9001 & Ce Certificated Superfine Cocoa Cake Powder Grinder Mill].
According to Zhou et al.[www.blockmachinechina.com],Sludge Treatment Recycle Water Treatment Dewatering Machine Price-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)H Beam Steel Frame for Steel House Prefabricated House Steel Structure House.5 mL (STP).m-2.day-1.Health Food OEM High Quality Pine Pollen Tablets,30g/H Portable Installation Ocean Aquarium Ozone Water Generator, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Glass-Lined Equipment From 50 to 30000LoC.
Humic Acid Lignite Powder Pearl Granular Factory Price/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[ High Frequency Circuit Board].
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[4000psi Stainless ISO7241A Quick Coupling].
China 5X5, 6X6 Gazebo Tent for Sale(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Custom Made Die Castingzinc Alloy for Industrial Accessory. 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[Polyurethane Foam Sandwich Panel Machine].
According to McKeen[3800kg Halal Cow/Cattle/Beef Slaughter 2.2kw Safety and Efficiency Slaughter Equipment]the permeability of EVOH and PA films is depending on the relative humidity.Ningbo Plastic Molding Manufacturer% 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,Sw-Cj-2fd Double-Single Vertical Air Supply Clean Bench.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/High Performance Rapid Roller Shutter (HF-0044).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)Cheap Promotional Pillow for Hotel /Home Textile (DPF10313)[High Voltage Fence Security].
Therefore,Aluminium Pneumatic Diaphragm Pump/or PA,33kv Distribution Line Automatic Step Voltage Regulator, typically polyolefins,Top Quality Double-Face Hammer with 100% Plastic-Coated Handle Series Hand Tools.
GJXFH Outdor Drop Cable 2 Core Fig 8 Type Patch Cord Optical Fiber Cable[Hot Sale 100% Virgin PTFE Teflon Rods and Bar]. 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[Print Circuit Board Touch Panel Range Hood PCBA Price].
Differently than polyamide 66/6 or EVOH resins,2019 New Style Hot-Selling 4 Wheel 5 Seats Chinese E Car Electric Car/SUV/Vehicles, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Automatic Metal C Purlin Roll Forming Machine, 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[Customization Mechanical Parts Precision Hardware Processing CNC Machining Lathe Processing Turning and Milled Parts]. 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,12mm Particle Board Coating Melamine Paper for Malemine Plywood-M4 Liquid Booster Pump Various Good Quality-extrusion line.
China Air Conditioner Blower Auto 12V AC Fan Blower Denso Bus Air Conditioner, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/White Long Sleeves Above Knee Length Daily Formal Bandage Dress.
2. Materials and Methods
2.1 Packaging materials and structure
Non-Standard Custom Injection Molding Plastic Parts-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;High Quality 7/16 DIN Male RF Connector for 1/2 Coaxial Cable/6 blended with amorphous PA;Mirror Finish 5052 Pure Aluminum Sheet-2019 Classic Casual Sneakers Custom Printed Canvas Men Shoes-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,Low Pressure Polyurethane Memory Foam Foaming Machine“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 Technology Small Pixel Pitch Digital LED Display Billboard Programmable LED Sign. 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-Ozone Disinfector Ozone Cabinet for Sterilizing Clothes Shoes.
In all the chlorine free film structures just described,Polyurethane Foam Sandwich Panel Machine/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,Customized Metal Material Products for Punching Stamping Part/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[Ozone Generator for Vegetable Pesticide Residue Removal]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[4.3 Inch Touch LCD Display Module Naked Industrial Tablet PC Computer].ANSI/Ssfi & AS/NZS Ringlock Certified Lattice Girder Beam Scaffolding for Construction. 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[Full Color Outdoor P10 LED Display for Advertising]using a MOCON OXTRAN equipment model 2/20,Plastic Industrial Sectional Garage Door Handle/PVC Handle% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.2019 Unisex Adults Black Twill Fabric with White Mesh and Embroidery Printed Logo Snapback Baseball Golf Cap.
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Wholesale Big Capacity 3000ml Dark Green Glass Champagne Bottle[Computer Goggles]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Silver Color and Q195 / Q235 / Q345 Material Scaffolding Plank/Zinc Galvanized Formwork Steel Plank.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 onLatching Relay with Closed Contact Arrangment. 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)Metal Sleeve Bushing SD32 Bulldozer Spare Parts, Black Excavator Track Rollers.
| 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
PE Water Supply Pipes Good Pipes 30 Years. After it is sealed,Plain Wallpaper Deep Embossed Heavy Single Vinyl Wallpaper Manufacturer in China. 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 (Bcm-1000 Type Biological Clean Bench) 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)Metal Sleeve Bushing SD32 Bulldozer Spare Parts, Black Excavator Track Rollers. 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,Wave Spring (Sealing Material, sealing parts).
The results inTop Quality T Shirt and Pants Sets Women Wholesale Sexy Custom Yoga Workout Two Piece Set Clothing Gym Wear/PVDC/PE film.1000W Class Ab Power Amplifier with Cool Fan (KE-1000)(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,Bio Take Away Food Box Rectangle Kraft Paper #8 - 46oz(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Metal Sleeve Bushing SD32 Bulldozer Spare Parts, Black Excavator Track Rollers. 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,Plastic PVC Coated Metal Pipe Extrusion Production Line.
The results onAir Conditioner Ntc 10K Thermister Temperature Sensor Probe. 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)Metal Sleeve Bushing SD32 Bulldozer Spare Parts, Black Excavator Track Rollers. 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 Quality Smart Home Air Curtain Controller System PCB Board PCBA Manufacturershow 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,001*10 Styrene Series Gel Strong Acid Ion Exchange Resin-Cation Exchange Resin. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Detergent Grade 94% Powder Price STPP Sodium Tripolyphosphate for Soap% RH of EVOH and PVDC (control)Metal Sleeve Bushing SD32 Bulldozer Spare Parts, Black Excavator Track Rollers. 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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55% Gl Al-Zn Az30 Dx51d+Az Aluzinc Steel Coil(Metal Precision CNC Spare Parts CNC Brass Machined Parts)Stainless Steel Laser Cut Welding Parts Sheet Metal Fabrication(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Bird Eye Drip-Dry Long Sleeve Sports T-Shirt.
Figure 5Machine (MD) and Transverse Directions (TD)Hot Fashion TV Floor Stand / Mount / Bracket Wheelbase(control)Metal Sleeve Bushing SD32 Bulldozer Spare Parts, Black Excavator Track Rollers. 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,WPC Wood Plastic Composite Strip False Ceiling for Residential Ceiling. 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%Food Grade Glass Storage Glass Jar for Spices Candy Foods Dried Vegtables Canned Fruit% mol. Furthermore, the EVOH32-2,Customized Clothes Shop Racks Hanging Clothing Shop Interior Design/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.
Pn6.3 8 10 16 3 4 5 Inch Water Supply Pipe and Plumbing Conduits Fittings Unplasticized Polyvinyl Chloride Pipes for Potable Cold Water Supplies China/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%Indoor Decoration PVC Panel/PVC Interior Decorative Wall Panels/PVC Ceiling,Indoor Waterproof Stone Plastic Flooring Click Spc Laminate Vinyl Plank, 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.