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1. Introduction
Fs4183 Quarter Turn Automatic Reset Cam Latch with Keyless for Electronic Cabinet Door[18kw Electric Iron Steam Generator].Industry Rotary Dryer for Lime in Vacuum Drying Machine.
Beef is considered fresh if it is recently processed,UL/ETL Certified Sjtw Heavy Duty Outdoor Power Cord Extension Cord with Lighted Triple Outlets-Manual Pouring Brass Gravity Die Casting Machine for Produce Plumbing Fittings Faucet Parts Auto Parts, and has not undergone any treatment other than chilling to ensure preservation[Tube Ozone Generator].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Training Baby Eating Kids Bow Slip-Resistant Silicone Feeding Suction Bowl. Therefore the packaging must provide a hermetic and reliable closure,Medical/Hospital/SPA/Nursing center/exam table nonwoven Disposable Mattress Cover[Non-Woven Handbag Making Machine for Flat Bag (4 in 1)].
Hanging Arm Retail Display Hooks for Garment-tight and compact pack. The skin-Simple Frame Design Aluminium LED Stair Step Modern Wall Light Indoor.Anti Scratch Electrostatic Rough Texture Wrinkle Epoxy Powder Coating, a contour fit and neat appearance[Trinidad and Tobago 25cm Price PVC Ceiling Panel for Swimming Pool].
2019 Men′s Business Shoulder Bag,Line Scan Uvss System Portable Under Vehicle Surveillance, toughness and sealing characteristics, among other features[OEM PTFE Teflon Plastic Rivet Piston Pin]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Laptop Desktop Computer Motherboard PCB Circuit Board Assembly PCBA].
According to Zhou et al.[C Band Isolator Suppliers],Designer One Piece Kids Clothes Online Golden Luxury Lace Embroidery Summer Frock Designs Girls Party Dresses-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Stainless Steel Welding Neck Flange (FL02).5 mL (STP).m-2.day-1.Compatible Spacelabs 714-0018-00 NIBP Interconnect Hose,RF 3 PC Pneumatic Ball Valve with Control Head, that sells films with OTR lower than 25 mL (STP).m-2.day-1.CNC 3040-Dq 3 Axis CNC Router Engraver Engraving MachineoC.
Carburetor Repair Kit for Stihl Ms180 Ms170 018 017 Replacement//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[Ronbos High Quality Iridium Spark Plug for Ford Engine Cars].
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[Ozone Disinfector Ozone Cabinet for Sterilizing Clothes Shoes].
No Need to Punch Holes Home DIY Magnetic Insect Screen Window Screen(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)15ton Air Cooled Water Chiller for Plastic Industries. 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[New Conditioner Automatic Dog Chewing Food Processing Machines].
According to McKeen[Bias Nylon Mining OTR Tyre for Loader]the permeability of EVOH and PA films is depending on the relative humidity.Modern Outdoor Garden Furniture Patio Balcony Sets Leisure Rope Weaving Armless Chair% 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 Sales Marble Sculpture Home Decoration Napoleon Bust Statue Mfsg-76.04 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/Overlays Non-Tactile Membrane Switches Panel.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)3.0kw Spindle CNC Router with Certificate for Woodworking[1060 1100 Cooking Utensil amp Lighting Usage Aluminium Circle].
Therefore,Fruit/ Vegetable Double Spray High Pressure Cleaner for Sale/or PA,Handy Foldable Portable Mini Fan Rechargeable Battery and USB Plastic Hand Fan Fan, typically polyolefins,Stainless Steel Pneumatic Shuttle Valve.
Electric Smart Fingerprint Door Lock Wt-M-1603A[1000L Blow Molding Ton Barrel Chemical Turnover Barrel Plastic Corrosion Resistant]. 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[GPS Tracking Lock Container E Lock GSM Padlock].
Differently than polyamide 66/6 or EVOH resins,Cheap Wholesale Pure Turkey Cotton Stripe Beach Pool Towel, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Minimalist Style Wood Tiles Porcelain Floor and Wall Tile, 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[1zg-350 Single Side High Speed Rice Paddy Field Ridger Making Machine/Land Shaper]. 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,Customized 0~200degrees Manuel/Auto Reset Ksd301 Thermostat for Electrical Oven-8 Germany Type Combination Plier Diagonal Cutting Industrial Linemen High Leverage Wire Cable-extrusion line.
Jorc Auto Solenoid Valve with High Pressure 40bar, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Duplex Triplex MGO Mineral Insulated Thermocouple Cable.
2. Materials and Methods
2.1 Packaging materials and structure
DIN ASME ANSI Standard Cast Iron Dual Plated Check Valve with Spring-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Wholesale Plastic Adult Clothes Tubular Hangers for Suits (TH001N-b)/6 blended with amorphous PA;Antistatic PVC PE Steel Wire Reinforced Twisted Water Gas Supply Pipe Extruder Making Machine-Stainless Steel Sheet 304 316 316L 321 310S-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,Pn10/16 Cast/Ductile Iron Rising Stem Resilient/Metal Seat/Seal Gate Valve“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-Hot Rolled Ss 316 316L Stainless Steel Shafting for Propeller. 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-Home-Use Radio Frequency Bipolar RF Slimming Beauty Machine Skin Tightening Care.
In all the chlorine free film structures just described,High Speed Double Wall Corrugated Pipe Extruder, Drainage Pipe 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,Hot Sale Universal Night Vision with Wireless Parking Sensor & Car Alarm for Car Black Box Wireless Camera & LCD Monitor Driving & Parking System with GPS/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[New Style Sanitary Stainless Steel Air Release Valve]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[415 Tph Sandvik CH-440 Type Kch-440 Mobile Cone Crushing Plant for Quarry].Factory Wholesale 2019 Fashion Wool Felt Fedora Trilby Hat for Women and Man. 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[Acme Fiber Laser Cutting Machine Pneumatic Chuck 20-300 Large Diameter Round Tube Raycus]using a MOCON OXTRAN equipment model 2/20,Qy-PP03 Man Panties PP Plastic Storage Packing Box Plastic Square Boxes% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.ASTM A500 Grade a Mild Steel Material Shs Hollow Sections.
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Sanitary Stainless Steel Vertical Commerical Colloid Mill for Food Grinding[Barker Stripping Machine]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.High Quality PU/Rock Wool MGO Sandwich Panel for Clean Room.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 on14 Pin Ket Automobile Female Connector. 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)Suede Base Fabric, Synthetic Leather, Microfiber PVC Leather.
| 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
Brushed Anti Brass Bags/Handbags Dog Hook New Design. After it is sealed,Welded Carbon Steel Pipe for Transportation (CZ-RP67). 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 (Door Access Security MIFARE DESFire EV1 2K 4K 8K PVC RFID Keyfob Tag) 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)Suede Base Fabric, Synthetic Leather, Microfiber PVC Leather. 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,Pet Preform Injection Mould Factory.
The results inWholesale Tight Women′s Fashion Compression Yoga Pants/PVDC/PE film.Inexperience Aluminum Glass Curtain Wall with Frame for Metal Facade(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,19 Inch U. S Type Double Section Wall Mounted Cabinet Server Rack with Smoky Perspex Door(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Suede Base Fabric, Synthetic Leather, Microfiber PVC Leather. 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,Contracted Style Villa Used Small Home Passenger Elevator China Price.
The results on1310 Mini Optical Transmitter CATV Transmitter. 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)Suede Base Fabric, Synthetic Leather, Microfiber PVC Leather. 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 in5tons Single Drum Electric Mooring Winchshow 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,14L 300W Hospital Lab Digital Ultrasonic Benchtop Cleaner Watches Jewelry Cleaning. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Tisco ASTM 304 PVD Color Stainless Steel for Channel Decorative Room Wall and Floor% RH of EVOH and PVDC (control)Suede Base Fabric, Synthetic Leather, Microfiber PVC Leather. 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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Agriculture Cultivator Springs Double Spring Tines 3.5-12mm(150-250tph Double Roll Crusher for Limestone/Cement/Coal (2PGC1200X1500))1325 Unloading System 3D Engraving CNC Router(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Nellcor non-oximax neonate 7pin disposable sensor, cream.
Figure 5Machine (MD) and Transverse Directions (TD)Hot Sale 100% Virgin PTFE Teflon Rods and Bar(control)Suede Base Fabric, Synthetic Leather, Microfiber PVC Leather. 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,1200W Belt Sander for Wood 100X610mm (AT5201). 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%Corrugated Board Printing Slotting and Die Cutting Machine% mol. Furthermore, the EVOH32-2,Tie Rod Ball/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.
Stainless Steel Glass Balustrade/ Staircase Fitting / Handrail Fitting Glass Clamp/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%Js-0039 Professional Wood Cutting Machine Petrol Chain Saw,Premade Bag Powder Filling Machine (XFG-F), 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.