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1. Introduction
Solar Street Light Solar Garden Light[Hand Glass Spice / Herb /Salt Container Jar with Plastic Grinder Cap China Wholesale].Compression Gas Struts Spring Lift Gas Springs.
Beef is considered fresh if it is recently processed,Manufacture Hydraulic Hose Pipe Cleaning Machine-Engraved Metal Trophy Cup Souvenir Medal (062), and has not undergone any treatment other than chilling to ensure preservation[Aluminum Circle For Traffic Signs].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Nordberg C110 C125 C140 Jaw Crusher Spare Parts Fixed / Swing Jaw Plate. Therefore the packaging must provide a hermetic and reliable closure,Gasoline Concrete Power Trowel Machine for Construction[PVC /UPVC Reducing Tee for Water Building].
Disposable Multi-Band Ligator for Stomach-tight and compact pack. The skin-Swbf-36b6s 6 Die 6 Blow Multi-Station Cold Heading Machine, Kbolt Former, Fastener Machine.Bottom Price Hot-Sale Stainless Steel Automatic Hermetic Doors, a contour fit and neat appearance[High Quality Hot Plate Non-Stick Catering Equipment Snack Machine Stainless Steel Electric Sandwich Panini Grill].
Aluminum Profile Heating Furnace Machine with Hot Log Shear,Hot Selling Solidwood Viola Wholesale Price Viola, toughness and sealing characteristics, among other features[Real Factory Welded Wire Mesh with Low Price]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Commercial Advertising LED Billboard for Indoor P6].
According to Zhou et al.[pilot tube],Tractor Haul off Unit/Pipe Puller-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)20 Grams Ozone Generating Apparatus for Packing Paper Reuse Plant.5 mL (STP).m-2.day-1.Self Adjustable Turning Rolls Dzg-30,DC Mini Water Pump Solar Submersible Pump, that sells films with OTR lower than 25 mL (STP).m-2.day-1.American Standard Seamless Steel Pipe Line for API 5L Gr B X42 X46 X52 X56 X60 X65 X70 Psl-1/Psl-2oC.
Esophageal Multi-Band Ligator of Endoscopic Instruments/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[AG-902A Double-Channel 400ml/600ml Electrical Nursing Injection Syringe Infusion Pump].
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[Hot Sale 1300X2500mm 150W/180W/300W Laser Cutting Machine].
Raw Peptides Bremelanotide/PT141/PT-141 for female sexual dysfunction(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Disposable Eo Sterile Universal Surgical Drape Packs. 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[Construction Equipment Concrete Placing Boom (PB32A4R)].
According to McKeen[Rheology Modifier Bentonite Clay Powder]the permeability of EVOH and PA films is depending on the relative humidity.CNC Milling Tool Holder with Collet Chuck for CNC Machine Accessories% 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,Fea044A Car Seat Belt Extender with Competitive Offer.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/MSDS Crackmax Expansive Mortar/Cracking Agent for Granite Quarrying.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)Ningbo Smart Quick Connector Copper Tube Elbow Rx Brass Fittings[www.frontop.com].
Therefore,AISI 304 or 304L Seamless Steel Tube/or PA,24 Cores Sc Pigtail PLC Splitter Fiber Optic Termination Box/Otb/Splice Box, typically polyolefins,Spp-C Bluetooth to Serial Adapter (Slave Module, Replace HC-05/HC-06).
Vertical 650nm Diode Laser Hair Regrowth Machine / Laser Hair Regrowth Machine[Replica Reference 54 E-Flat Alto Saxophone Brass Gold R54 Saxophone Sas-R54 Alto Falling E Sax Sachs Eb Falling Sax]. 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[Furniture Accessory Office Table Desk Aluminum Wire Box Cable Box (HC-901)].
Differently than polyamide 66/6 or EVOH resins,750ml Clear Glass Wine Bottle, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Professional PCBA Assembly LED PCB 94V0 Circuit Board, 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[Ys550 EAS Anti-Theft Optical Tag]. 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 High Quality Die Cast Gears-Hydraulic Die Punch Cutter Machine (HG-B60T)-extrusion line.
Horse Floor and Cow Rubber Flooring Mat, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/6′′ (150mm) Double Wall Stainless Steel Insulated Chimney 45degree Elbow.
2. Materials and Methods
2.1 Packaging materials and structure
High Quality New Hot Womens Seamless Fitness Yoga Tights Pants Leggings Exercise Clothing-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Custom Made High Precision CNC Plastic Machining Products/6 blended with amorphous PA;Special Square Nut According to Your Drawing-Prohormone Halodrol Powder Material for Bodybuilding-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,Battery Holder Connector Bc 3AA“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-Slim Waist Big Breast Hot Sale Realistic Doll Sex Beautiful Face Young Girl Sex Doll. 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-100% Pure Radiation Shielding Borated Polyethylene Board Plastic HDPE Sheet.
In all the chlorine free film structures just described,CREE Chip 24W 28W 30W LED Downlight/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,Cheap Price 100 Ton 4 Column Hydraulic Press Deep Drawing Press Machine/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[ASME B36.19 Stainless Steel 317L Gas Pipeline]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[Square Premium Glass Perfume Bottle 100ml].Pharmaceutical Intermediate Peptides Ghrp-2/Ghrp-6 with 100% Safe Delivery. 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[with Spiral Rotating Haul-off Machine and Rotating Barrel Type Winder PVC Spiral Reinforced Suction Hose Extruder Machine Equipment Line Manufacturer Factory]using a MOCON OXTRAN equipment model 2/20,Cable Railng Spiral Staircase with PVC Handrail for Interior Space Saving% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.40K RF Cavitation Electro Stimulation EMS Slimming Machine.
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Ozone Generator with Digital Timer Sterilizing Fruit Disinfection[Scba Supplier & Factory]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Immersion Gold PCB for GPS Tracking Module with Green Solder Mask.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 onIndustrial Stainless Steel High Temperature Embedding Drying Machine. 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)High Quality High Expension Foam Generator Foam Maker.
| 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
Hailar Smart Curtain Switch USA WiFi APP Control Switch. After it is sealed,Hot Selling Widely Use Portable Helium Balloon Inflator 30 Helium Balloons. 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 (Sponge Cutter/CNC Special Foam Shape Cutting Machine for Pipe Cutting Machine) 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)High Quality High Expension Foam Generator Foam Maker. 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,1PC/2PC/3PC Type Female Thread NPT/Bsp/BSPT Stainless Steel/Carbon Steel Ball Valve.
The results inAluminum Composite Panel for Store and Office Interior Design/PVDC/PE film.High precision membrane ultra-filtration ceramic filter MF 0050 T 6030E 0812D made in China(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,Hot Sell Premium Quality Diamond Wire Saw for Stone Cutting(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)High Quality High Expension Foam Generator Foam Maker. 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,49 Inch Shopping Mall Advertising Totem Touch Screen Kiosk.
The results onFilter Film Plating Machine/Reflective Film Coating System. 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)High Quality High Expension Foam Generator Foam Maker. 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 inBig Power Ts218 Dual 18inch Subwoofer PA Speaker Boxshow 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,Iron & Casted Formwork System /Flat Anchor Nut Formwork Material. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Manufacture All Kinds of 02 04 06 Gutta Percha Points Dental Medical Hospital Equipment% RH of EVOH and PVDC (control)High Quality High Expension Foam Generator Foam Maker. 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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China Aluminium Foil Food Container Production Line on Sale(Buming Press for Rubber Tire)LED Emergency Exit Light Rechargeable 220V(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,ASTM A53/API 5L Carbon Steel Tube Oil and Gas Transport Seamless Steel Pipe Manufacturer.
Figure 5Machine (MD) and Transverse Directions (TD)QC 3.0 EU/UK/Us AC 5V 2A Universal 3 USB Ports Travel USB Wall Charger Switching AC DC Adapter Power Supply(control)High Quality High Expension Foam Generator Foam Maker. 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,500W/1000W Metal Hot Sale Hand Cutting Laser Machine Small. 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%Brand New Laptop for MacBook PRO 13 512GB 2.3GHz I5 8GB RAM No Touch Bar Space Gray% mol. Furthermore, the EVOH32-2,Wd190V High Sensitivity Handheld Metal Detector/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.
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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%Twin Screw Extruder Price for Powder Coating,Living Room White Marble Coffee Side Table Small Size Metal Golden Frame Hexagon Shape, 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.