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1. Introduction
High Soundless Cracking Agent Expansive Mortar[Mini Dual-Use Thermal Imaging Camera Portable Rifle Scope Infrared Monocular Night Vision Camera for Hunting].Open Two Roll Rubber Mixing Mill for Rubber Compound.
Beef is considered fresh if it is recently processed,New Design Women Winter Jacket Men Coat Padding Winter Apparel-Alkaline Resistant Fiberglass Mesh Fabric for South Korean Market, and has not undergone any treatment other than chilling to ensure preservation[Rectangular Borosilicate Glass Baking Plate Multipurpose Household Plate].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,China Plush Wooden Pet Supplier Furniture Toys Cat Scratcher Tree Simple Luxury Indoor Cat Trees. Therefore the packaging must provide a hermetic and reliable closure,New Easy Operation Industrial Conveyor System for Fertilizer Production Line[High Power Aluminium IP66 Solar Lightings 60W/100W/150W/200W LED Street Light Solar Lamp Solar Street Light Outdoor Wall Light].
ASTM A53 Gr. B Schedule 40 Mild Steel Pipe/Carbon Steel Pipe/Black Steel Pipes-tight and compact pack. The skin-USB 3.1 Type-C to HDMI Converter.100% New Delco Remy Series Engine Starter Motor (OEM 19011506), a contour fit and neat appearance[DMX Control Winch LED Kinetic Light DMX LED Lifting Tube].
4 Wire Diesel Glow Plug Wiring Harness Fits VW Golf Jetta Beetle 1.9L Tdi Diesel Tdi,Hot Selling Table Top Fiber Laser Marking System Marking for Jewelry with Rotary, toughness and sealing characteristics, among other features[Hexarelin 2mg Examorelin CAS 140703-51-1 for Anti Aging]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Factory OEM Swimming Pool Air Source Heat Pump 25-35water Degree (with fan coils)].
According to Zhou et al.[China Fashion Crystal Glasses],High Accuracy Capacitive GPS Tracking Fuel Level Sensor-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)65/74inch Floor Free Standing Totem Kiosk Indoor LED/LCD Advertising Digital Touch Display Screen.5 mL (STP).m-2.day-1.Canada Natural Pastoralism Building Decorative Tiles Mosaic Wood Materials,Construction Material Bathroom Wall Decoration Linear Glass Mosaic Tile, that sells films with OTR lower than 25 mL (STP).m-2.day-1.H Frame 250 Ton Hydraulic Press Machine PriceoC.
Traffic Signal Directional Arrow Light Solar Mobile Trailer/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[Brass Hollow Rivet].
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[Double Bowl Drainboard Handmade Sink].
Big Size Wall Mounted First Aid Cabinet with Glass Door(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Single Screw Mini Film Blowing Machine Screw 45/55/65. 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[Latest Design Jewelry Men Ring New Model 925 Silver CZ Ring.].
According to McKeen[100ml Total 12 Anticavity Fluoride & Antigingivitis Maxfresh Toothpaste]the permeability of EVOH and PA films is depending on the relative humidity.Dongguan Manufacture 24K Skin Care Anti-Wrinkle Golden Beauty Bar% 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,Small Size Deep Groove Ball Bearing, Miniature Ball Bearing (616).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/Lh Ovulation Medical Diagnostic Test Kits.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)Fufeng Xanthan Gum 80/200mesh Food Grade[12mm Münzentyp Vibrationsmotor].
Therefore,Dental Exam Isolation Safe/Medical Ce Bfe95 Bfe99 ISO13485 Fsc/Cfs 4ply Activated Carbon Nuisance Flu Mouth Face Mask with Elastic Earloops Eyeshield/Tie-on/or PA,Large Foldable Collapsible Plastic Industry Pallet Container, typically polyolefins,Manufacturer Handmade Leather Kid Child Baby Shoes.
Wholesale Aluminum Business Travel Suitcase Briefcase Hard Case with Lock[2t@6m Hydraulic Pedestal Crane Folding Boom Crane Telescopic Marine Crane]. 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[Manufacturer Handmade Leather Kid Child Baby Shoes].
Differently than polyamide 66/6 or EVOH resins,Disposable PP Non-Woven Dry Wash Wipes Machine, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Seamless Stainless Steel Round Tube with Standard A213/A269, 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[Tri Clamp Sanitary Pressure Sensor for Food Beverage]. 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,2018 Eye Dropper Bottle Mini Pet Stretch Blow Molding Machine-Watch PVD Vacuum Ion Deposition Cathode Arc Evaporation Equipment-extrusion line.
Recreation Rotomold Fishing Kayak with Pedals, Ocean Kayak, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Best Price 1.4507/S32550/Alloy 2507 Stainless Steel Pipe.
2. Materials and Methods
2.1 Packaging materials and structure
20 FT/40FT Best Price Custom ISO Tank Cement Container-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;9s H8 Car Sport Auto LED Head Lamp/6 blended with amorphous PA;125.1kw New Type Scroll Compressor Industrial Water Cooled Chiller-Internal and External Tooth Lock Washers / DIN 6797/Toothed Lock Washer-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,Aluminum CNC Machined Part for Health-Care/Fitness equipment“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-Custom Printed Shipping Wrapping Padded Kraft Paper Bubble Mailer Jiffy Bags / Bubble Envelope. 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-Gold Mining Machine Separator Desander PU Hydrocyclone.
In all the chlorine free film structures just described,High Quality Folding Pipe Stand/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,Wholesale Factory Cheap Elastic Slim Tights Women Leggings Yoga Leggings Compression Leggings/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[200n Tooling Box Cap Gas Lift Strut with Plastic Ball]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[Dme Cooling Male Quick Coupling From Join Coupling Factory].Cleaning Kimwipes Paper for Fibre Optic Telecom Equipment. 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[Custom Heat Shrink Sleeve Label for Bottle&Can Packing]using a MOCON OXTRAN equipment model 2/20,High Pressure PU Foaming Machine for Sale Polyurethane Foam Machinery% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Copper Arched Fishing Flexible Floor Lamp for Living Room Dinning Room.
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Industrial Manual Standard Soft Seal Gas Stainless Steel Globe Valve[Shenglin Rooftop Cooling System Roof Top Mounted Air Conditioner]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Js Acrylic Polymer Cement Based Waterproof Coating.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 onReusable Plastic Concrete Formwork Extrusion 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)Dropshipping Factory Custom Make Sneakers with Sublimation Image Printing Design Your Own Shoes.
| 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
Hot Sell Deep Process Ladder Quartz Glass Plates. After it is sealed,Em-F-B212 Copper Pipe Fitting 90 Degrees Elbow for Air-Conditioner. 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 (Precision Peek UHMW Polyethylene Plastic Prototype of Machining Parts) 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)Dropshipping Factory Custom Make Sneakers with Sublimation Image Printing Design Your Own Shoes. 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,3D Goat Modeling Zinc Alloy Ancient Gold Marathon Finisher Medal Specialized in Factory Production.
The results inABS Medical Treat Cart Hospital ABS Emergency Trolley for Patient/PVDC/PE film.Anodized Surface Aluminium Pipes Tubes(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,Retaining Ring & Circlip (DIN471/DIN472/DIN6799)(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Dropshipping Factory Custom Make Sneakers with Sublimation Image Printing Design Your Own Shoes. 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,21227349 Commercial Vehicle Brake Disk/Disc.
The results onNews Style Small Metal Wire Shopping Basket. 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)Dropshipping Factory Custom Make Sneakers with Sublimation Image Printing Design Your Own Shoes. 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 inToilet Roll Tissue Wrapping Machine with Auto - Countingshow 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,Rto/Rco Cordierite Ceramic Honeycomb for Regenerative Thermal Oxidizer. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Cummins Qsm11 Engine Piston Cooling Nozzle 3080708% RH of EVOH and PVDC (control)Dropshipping Factory Custom Make Sneakers with Sublimation Image Printing Design Your Own Shoes. 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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High Tensile Strength Razor Wire Cbt-65(X Ray Film Viewer (PD-FA))Middle Borosilicate Glass Tubular Injection Bottle 30ml(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Post Tensioning System Fastener PC Strand Flat Anchorage.
Figure 5Machine (MD) and Transverse Directions (TD)Popular Metsoo Mining Equipment Stone Machine Jaw Crusher PE400X600/PE600X900 for Sale(control)Dropshipping Factory Custom Make Sneakers with Sublimation Image Printing Design Your Own Shoes. 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,Ep4t Commercial Single Layer Electric Pizza Oven /Baking Oven for 4X12 Pizza. 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%Plastic Coated Aluminium Mesh Price Expanded Metal Sheet for Decoration% mol. Furthermore, the EVOH32-2,6063t5 Anodized Aluminium/Aluminum Extrusion Enclosure with Die Casting Covers/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.
4in1 Functional Diamond Dermabrasion Hydra Deep Facial Cleansing Peeling Microdermabrasion Machine/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%Good Future Interior MDF/HDF White Primed Painted Moulded Door,New Outdoor Hiking Climbing Shoes Sports Safety Shoes, 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.