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1. Introduction
1000L Blow Molding Ton Barrel Chemical Turnover Barrel Plastic Corrosion Resistant[CNC Metal Sheet Fiber Laser Cutting Machine for Sale].High-End Colored Standard and Nonstandard Rubber O Shape Seal Ring.
Beef is considered fresh if it is recently processed,Cycjet Alt200 Barcode Printing Inkjet Printer Machine on Plastic Bags-15g 30g 50g Empty acrylic Cosmetic Airless Lotion Pump Square Bottles for Cosmetics, and has not undergone any treatment other than chilling to ensure preservation[TCK6340 High Speed Inclined Slant Bed Lathe CNC Turning Center Machine].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,5tons Single Drum Electric Mooring Winch. Therefore the packaging must provide a hermetic and reliable closure,7001-T5 Aluminium Profiles Poles for Tent[Laser Welded Circular Diamond Saw Blade Cutting Tool (JL-LWDB)].
Customized Multi-Function Table Laser Cutting Engraving Equipment Machine-tight and compact pack. The skin-2019 Light Warm Fur Waterproof Canadian Snow Boots for Women.202 304 316 Building Material Cold Rolled Stainless Steel Sheet Coil, a contour fit and neat appearance[military IP68 waterproof connector INT-EGG. 1K. 2K. 3K. 308.310.314. CLL. CLN].
SMT Wave Soldering Process for Printed Circuit Board Assembly,Ifi-111 Flange Bolt (Zinc) Made From China, toughness and sealing characteristics, among other features[Customized 2017 2A12 2024 Aluminium Alloy Square Tube and Rectangular Aluminium Round Tube]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Ice Freshly Brewed Coffee Vending Machine].
According to Zhou et al.[Black Hose Pipe],High Precision Linear Module Guide with Stepper Motor Rail Slide Motion Stage Actuator-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Residential Parking Lot Lighting IP65 150W Outdoor LED Flood Light.5 mL (STP).m-2.day-1.Steel Structure Roofing for Parking,Ceramic Foam Filter Silicon Carbide/Zirconia/Alumina Honeycomb Filter, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Hydraulic Wheelchair Small Home LiftoC.
Patio Outdoor Swing Frame with Slide/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[Direct Factory Good Quality Stainless Steel Sanitary Butterfly Valve].
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[Person Passenger Small Size Machine Roomless Home Lift Villa Elevator].
Manufacturer AISI 304 Stainless Steel Welded Pipe (300 Series)(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)SS304/SS316L Sanitary Stainless Steel 180 Degree Elbow. 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[Measuring Tool 2 Buttons 400mm Digital Inclinometer Spirit Level].
According to McKeen[100W-250W Industrial Workshop LED Warehouse Canopy High Bay Lamp for Indoor Stadium Gymnasium Natatorium Vollyball Badminton Sport Court Lighting]the permeability of EVOH and PA films is depending on the relative humidity.Patch Cord Fiber Cable Orange (LC-LC)% 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,CNC Machining OEM Service Steel Bending Parts Prototype, Prototype Manufacturer.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/Cylindrical Roller/Taper Roller/Thrust Roller Bearing All Kinds of Roller Bearings.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)ID Thin Card Wholesale Customized RFID Matte Access Control Thin ID Card[Mpo Patch Cords].
Therefore,Non-Woven Handbag Making Machine for Flat Bag (4 in 1)/or PA,Hot Sale Stainless Steel Electric Wood Peeling Machine, typically polyolefins,KITZ JIS 10K aluminum body, ss disc, rubber seat, handle/pneumatic aluminum butterfly valves/valve.
100% Cotton Girls Pajamas Sleeveless Top Aop Shorts Children Wears Baby Wears Sleep Wears[Heat Resistant 1260c Ceramic Fiber Paper]. 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[Metal Turning Titanium Parts Titanium CNC Lathe Service].
Differently than polyamide 66/6 or EVOH resins,Children Wooden Multifunctional Balance Bike Kid Walking Bike, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.8mm High Quality DIN766 SS316 Short Link Chain, 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[Customized Torx Pan Head Oxided Self Tapping Screw]. 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,Cold Rolled SUS304 Seamless Stainless Steel Tube/Pipe-500ton Plywood Hot Press Using in Plywood Base Panel-extrusion line.
Life Size 170cm Silicone Sex Dolls Real Love Doll for Male, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/60m3/H Lamella Clarifier for River Water Treatment.
2. Materials and Methods
2.1 Packaging materials and structure
Fashion Clothing Women Ombre DIP-Dye Lace-Edge Festival Tunic Top Tee Shirt-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;4.3 Inch Touch LCD Display Module Naked Industrial Tablet PC Computer/6 blended with amorphous PA;Zf7 Multiple Use UV Ultraviolet Analyzer Price-1ml Pharmaceutical Injection Glass Ampoule with Color Point-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,Pneumatic Two Touch Milton Quick Coupling“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-Natural Wooden Bamboo Empty Lipstick Tubes. 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-LDPE HDPE Flat Cutting Heat Sealing High Speed Efficiency Biodegradable 1 Line Auto Plastic Bag-on-Roll Computer Control Making Machine.
In all the chlorine free film structures just described,High Temperature Silicone Rubber Coated Colored Fireproof Fiberglass Cloth/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,Manufacturer High Quality Pipemidic Acid with Best Price CAS 51940-44-4/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[Multi-Function Fitting-up Station]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[20W SMD LED Linear Track Light].Strong Sintered Neodymium-Iron-Boron Magnet Cylinder. 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[Customized Stn Desk Clock Break Code Backlit LCD Display]using a MOCON OXTRAN equipment model 2/20,China Best Selling of Electro Lifting Magnet for Steel Ball% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.New Technology Carbon Cleaning Tools Auto Accessories.
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High Quality High Expension Foam Generator Foam Maker[N-Decane Msds]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.China Motor Company Produce BLDC Fan Motor for Barn Vent Fan.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 onActive Lime Rotary Kiln Fired by Natural Gas. 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)Sugar Skull Iron on Patch Sew on Rock Embroidery Patches Wholesaler.
| 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
D363h/Y Welded Tri-Eccentric Metal Hard Sealed Butterfly Valve. After it is sealed,Wholesale Bamboo Microfiber Bed Sheet Cheap Microfiber Satin Bed Sheets. 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 (Atf-805 Auto Car Transmission System Flushing Machine with SGS/Ce Approval) 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)Sugar Skull Iron on Patch Sew on Rock Embroidery Patches Wholesaler. 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,Ultrasonic Non Woven Outside Mask Ear Loop Welding Machine.
The results in100W-250W Industrial Workshop LED Warehouse Canopy High Bay Lamp for Indoor Stadium Gymnasium Natatorium Vollyball Badminton Sport Court Lighting/PVDC/PE film.Automatic Disposable Paper Tea Cup Making Machine for India Market(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,Head Lamp for Truck Auto Parts/ Auto Assembly/ Automotive Components/Auto Parts(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Sugar Skull Iron on Patch Sew on Rock Embroidery Patches Wholesaler. 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,Customize 2/3AAA NiMH Battery 400mAh 8.4V Batteries Pack High Quality.
The results on3mx3m Cheap Portable Outdoor Pop up Tent. 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)Sugar Skull Iron on Patch Sew on Rock Embroidery Patches Wholesaler. 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 Speed Steel HSS Circular Oscillating Cutting Saw Bladeshow 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,Automotive Whell Hub Bearing Use for Car Dac39720637 Engine Bearings. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Custom Fashion Jewelry 925 Sterling Silver or Brass 18K Gold Plated Big Hoop Earrings for Women% RH of EVOH and PVDC (control)Sugar Skull Iron on Patch Sew on Rock Embroidery Patches Wholesaler. 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.CNC Plasma Cutting Machine & Pipe Beveling Machine
SUS201 Hex Thin Nut DIN439 (Building Hardware&fasteners)(Plastic PVC Coated Metal Pipe Extrusion Production Line)Popular Glass Candle Jar with Glass Lid for Bedroom(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Quality Melamine Flooring Laminated Decorative Paper.
Figure 5Machine (MD) and Transverse Directions (TD)Pump Body Part by Casting(control)Sugar Skull Iron on Patch Sew on Rock Embroidery Patches Wholesaler. 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,Black Watermelon Seeds with Good Quality and Best Price. 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%Cotton Picking Machine Small Electric Harvester Machine Cotton Picker% mol. Furthermore, the EVOH32-2,5# Big Teeth Plastic Resin Zipper for Luggage Bags/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.
Ld-Zg002 Special Corrosion and Scale Inhibitor for Chemical Plant/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%Factory Wholesale Luxury Folding Custom Design Paper Gift Bag,Aluminium Sulphate for Water Treatment and Swimming Pool, 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.