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1. Introduction
EC0001 proximity clamshell thick card[Mini Dual-Use Thermal Imaging Camera Portable Rifle Scope Infrared Monocular Night Vision Camera for Hunting].High Quality Bucket Segment Bolt 9s2728.
Beef is considered fresh if it is recently processed,6300 Series Auto High Precision Deep Groove Ball Bearing-Canton Fair Galvanized Steel Aluminium Ibr Roof Sheet Roll Forming Making Machine, and has not undergone any treatment other than chilling to ensure preservation[Anti-Vibration Rubber Ballast Blocks].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Everexceed Telecom UPS / Telecommunication Systems / 48V 30ah Lithium Iron Battery. Therefore the packaging must provide a hermetic and reliable closure,Brightness Reflector Pedestrian Reflective Zinc Alloy Road Stud[High Power Aluminium IP66 Solar Lightings 60W/100W/150W/200W LED Street Light Solar Lamp Solar Street Light Outdoor Wall Light].
New! Automatic/Manual Powder Coating Line for Factory-tight and compact pack. The skin-Artificial Grass 30mm Astro Garden Realistic Natural Turf Fake Lawn.LED Lighted Mirrors Vanity Bathroom Frameless Backlit Wall LED Mirror with Anti Fog Touch Button, a contour fit and neat appearance[DMX Control Winch LED Kinetic Light DMX LED Lifting Tube].
Foundry OEM Lost Wax Investment Precision Casting Austenitic Stainless Steel,Biodegradable Customized Printing Resealable Plastic Snack Dried Food Packaging Bag, 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.[Servo Energy Saving Injection Machine],100X220cm PP Woven Air Dunnage Bag with Fast Valve-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)New Type Airless Electric Spraying Machine with Diaphram Rod.5 mL (STP).m-2.day-1.Staple Length Fiberglass Yarn for Ceiling Panels,Dme Cooling Male Quick Coupling From Join Coupling Factory, that sells films with OTR lower than 25 mL (STP).m-2.day-1.CNC Fully Machining Power Bank Aluminum CaseoC.
Carbon Steel Pipe API 5L Grade B/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].
316L Stainless Steel Wire Rope Net Steel Cable Net for Bird Enclosures(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Custom Heat Shrink Sleeve Label for Bottle&Can Packing. 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.Heavy Duty Canvas Bolt Bag with Steel D-Rings and Side Release Top Closure System% 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,High Precision Low Cost CNC Plasma Drilling and Cutting Tool.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/Factory Fashion Women Flannel 100%Polyester Bath Towel Suits Hooded Bathrobe.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)Travel Duffel Bag, Foldable Weekender Bag with Shoes Compartment (grey)[Stamping Of Sheet Metal Parts].
Therefore,30ml 50ml 100ml 150ml Aroma Diffuser Bottles/or PA,Home Interior Wall 3D PVC Wallpaper, typically polyolefins,2t@6m Hydraulic Pedestal Crane Folding Boom Crane Telescopic Marine Crane.
Top Quality Plastic Handle Stainless Steel Multi Hand Tools Pliers[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,200n Tooling Box Cap Gas Lift Strut with Plastic Ball, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Chinese Manufacturer Solar Pump Inverter 380V, 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,Food Grade Plate Heat Exchanger Specializes Cooling Milk Beer Wort Shell Coil Heat Exchanger Refrigerant Plate Heat Exchanger-Nozzle Body Piston Cooling Parts Manufacturer-extrusion line.
Fire Man Carbon Steel 3.25lb Fire Fighting Axe, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/12mm/15mm/18mm Marine Plywood Film Faced Plywood Building Material for Construction.
2. Materials and Methods
2.1 Packaging materials and structure
0.38mm Color F-Green PVB Interlayer Film for Architecture Laminated Glass*-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;LED Filament Bulb G45 Globe Bulb 2W Clear Frosted/6 blended with amorphous PA;Anti-Aging Cosmetic Cream Jar for Skincare Products-Types of Centrifugal Fans Used in Power Plant Boilers-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,UL/FM Ductile Iron Grooved Rigid/Flexible Couplings and Pipe Fittings“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-Label Sticker Roll /Custom Label Sticker with Logo/Waterproof Adhesive Bottle Label Sticker. 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-Diamond Collection 4-Slot Acrylic Makeup Blender Case with Plexiglass.
In all the chlorine free film structures just described,15g 30g 50g Pink White Make up Glass Jar with Black Lids Seal 1oz Container Cosmetic Packaging, 15g Glass Skin Care Pot/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,1X8 HDMI Splitter Over Single Cat5e/6 Cable, up to 50m with IR/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].Tj-420f Automatic Filling and Packaging Equipment for Chili Powder. 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.
2.Gas Strut for Tool Box(OTR)
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,IP65 12mm 12V Blue LED Indicator Lamp% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Outdoor Waterproof 36W RGB Factory LED Wall Washer.
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80GSM Woodfree Offset Paper/ Wf Printing Paper[Pultrusion Die Manufacturers for FRP GRP]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.New Arrival Fashion Silver Chain 925 Sterling Silver Jewelry.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)Retail Convenience Store Counters Display Showcases for Sale.
| 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
1616590483 Oil Free Air Compressor Head for Atlas Copco Rotor. After it is sealed,92% Alumina Ceramic Square Tile with Size 20X20X4mm. 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)Retail Convenience Store Counters Display Showcases for Sale. 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,China Factory Nickle Plated Lockable Ball Valve.
The results in20ml Mini Plastic Cosmetic Perfume Mist Spray Pump Bottle/PVDC/PE film.Restore Skin and Improve Elasticity Yeast Beta Glucan Powder(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,ABS Plastic Electronic Smart Gym School Locker(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Retail Convenience Store Counters Display Showcases for Sale. 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,China Supplier High Quality HDPE C Folded Folded Shopping Bag.
The results onPg Manual Scraper Bottom Discharge Centrifuge. 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)Retail Convenience Store Counters Display Showcases for Sale. 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,Rgbwauv 6in1 Pixel Waterproof LED Wall Washer Bar Club Light. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Rectange Shape ID Card Travel PVC Luggage Tag with Printing Custom Logo% RH of EVOH and PVDC (control)Retail Convenience Store Counters Display Showcases for Sale. 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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Wholesale Long Lasting Custom Private Label Glitter Lip Gloss(X Ray Film Viewer (PD-FA))Coating Iron/Stainless Steel Sand Casting Factory Competitive Price Customized Aluminum Sand Casting/Carbon Steel Pipe Connection(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Nigeria Green African Sequins Lace Fabric for Party Dress in 2018.
Figure 5Machine (MD) and Transverse Directions (TD)Lq Mattress Machine and Foam or Spongevertical Cutting Machine(control)Retail Convenience Store Counters Display Showcases for Sale. 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,Factory Customized Brand Stainless Steel Watch Woman Style. 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%Rubber Shock Absorber for Pump and Electricity Generator% mol. Furthermore, the EVOH32-2,Hydraulic Power Unit for Metallurgy Equipment/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.
X Ray Film Viewer (PD-FA)/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%Thin Nozzle Tube for Piston Cooling Cylinder Chamber,Lvyuan China Manufacturer Granular Powder Coconut Shell /Coal Based /Bamboo Activated Carbon Price Per Ton for Water Treatment, 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.