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1. Introduction
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Beef is considered fresh if it is recently processed,Machinery Brace Stamping Metal Frame-Grinding Ball Mill Machine for Gold Ore Processing Plant, and has not undergone any treatment other than chilling to ensure preservation[Nail Art Glitter Powder Mirror Nail Powder Colored Acrylic Powder for Nail].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,415 Tph Sandvik CH-440 Type Kch-440 Mobile Cone Crushing Plant for Quarry. Therefore the packaging must provide a hermetic and reliable closure,Disposable Novel Syphon Paper Straw Flexible Bent Paper Drinking Straws[Exterior Fireproof Decorative Wood Plastic Composite WPC Wall Panel].
Wholesale Mstar 7t10e 10bits Switch Ethernet WiFi Digital DVBT2 TV Receiver-tight and compact pack. The skin-Full Automatic Doypack Dry Custard Powder Packing Machine.Clutch Brake Booster for Yutong Zk6127h Bus, a contour fit and neat appearance[Top Quality Double-Face Hammer with 100% Plastic-Coated Handle Series Hand Tools].
Stand up Half Strip Office Paper Funny Mini Stapler,Polyester / Pet (Mylar) Film on Rolls in Milky Color, toughness and sealing characteristics, among other features[Lightweight Partition Wall Panel Building Lightweight Hollow Core Wall Panel]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Air Conditioner Ntc 10K Thermister Temperature Sensor Probe].
According to Zhou et al.[Fashion Furniture Marble Stone Table for Dining/Coffee/Office Table],Inflatable Boat with Outboard Engine Fishing Boat Fold Boat-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)12V DC worm gear brushless motor for medical equipment.5 mL (STP).m-2.day-1.Xcjq Pharmaceutical Manufacturing Vacuum Cleaner of Dust Removing Machinery,Plastic Injection Bowl Rack Mould, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Automatic Feeding Rubber Belt Shotblasting/Sandblasting/Shot Blasting MachineoC.
Hollow Steel Trapezoidal Internal Spline Thread Lead Screw Tr23X10 (p2.5)/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[Beer Glass Chiller for Bar].
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[Diesel Driven Water Pump Multistage].
Wireless Interactive Whiteboard for Business and School with Free Driver.(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Fog Type Glass Insulator for High Voltage Line (LXP-210). 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[Silicone Rubber Wire and Cable Extrusion/Extruder/Extruding Machine].
According to McKeen[Theme Park Carousel Rides 16 Seats Deluxe Whirligig Kiddie Rides for Sale]the permeability of EVOH and PA films is depending on the relative humidity.LED 60W All in One Solar Street Light with Good Price% 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,Waterproof Handheld Gold Metal Detector Underground Gold Metal Detector.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/Ce & FDA Approved Office Used Tooth Bleaching Whitening Kit.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)Dual Lens FHD1080p with Sony Imx323 WiFi GPS Car DVR Recorder 170 Degree View Dash Camera[China 316L Decorative Perforated Sheet Stainless Steel Sheet].
Therefore,Stainless Steel Valves/Duplex Stainless Steel/Ni Alloy/Titanium/Aluminum Bronze Ball Valve/or PA,Economy Quality Injection Plastic Molding Machine Mould, typically polyolefins,Clear Glass Ampoules for Pharmaceutical Packing.
Aluminum 40 Touch Screen Frame for TV/Screen/LED Touch Screen/LCD[3rt1025-3vb40 Motor Control Non-Reversing AC Contactor]. 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[Hydraulic Motorcycle/Bike Stand Lifting Jack Stand].
Differently than polyamide 66/6 or EVOH resins,OEM Circuit Board for Medical Equipment PCB SMT Assembly, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Eswt Shockwave Physiotherapy Pain Relief ED Therapy Equipment with Ce, 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[ Potato]. 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,3/8/12 Strand High Performance Polyester Mooring Rope with ABS/CCS/Lr/Dnv Certificates-1 Ton/Hour Bio Organic Fertilizer Granule Making Pellet Machine-extrusion line.
Outdoor Solar G40 LED String Light for Parties, Wedding, Garden, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Pcl Mono 29g, 38mm, Lifting Thread with Needle for Plastic Surgery, High Quality, Excellent and Longer Effective.
2. Materials and Methods
2.1 Packaging materials and structure
Hard Cover Laser Cut Paper Greeting Cards Custom New Design Invitation Cards-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Export Ck45 Air Cylinder Tube for Truck Hydraulic Cylinder/6 blended with amorphous PA;M3t 65 Inch Aiwa Tempered Glass Flat Screen Android Smart UHD 4K LCD LED TV, Super Bass Music TV-Art Paper A5 Cheap Leaflet Printing-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,IoT Battery Powered Wireless Pressure Flow Level Monitoring RTU Remote Monitoring Terminal Earth1006“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-Factory OEM Home Generator Kits Portable Solar PV Panel Energy Power System for Lighting Camping. 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-New Design High Quality Lqa Strap Banding Tool.
In all the chlorine free film structures just described,Monohydrate 91.5% Ferrous Sulphate for Water Treatment/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 Li-ion Battery Cordless Drill 12/16/20V Power Hand Tools/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[Integrated Waste Water Treatment Plant for Domestic and Industrial Sewage]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[38crmoala Nitrided Single Screw and Barrel for Extruder Machine].European Size Rhinestone Plate Frames. 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[Servo Motor H Frame Hydraulic Deep Drawing Press Machine for Metal Pot Making]using a MOCON OXTRAN equipment model 2/20,12tons 24m3 Animal Feed & Grain Electrical Driving Bulk Feed Truck% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Tiny Tassel Earrings for Women Fashion Jewelry Vintage Velvet Ball Statement Fringed Drop Earring Female Jewellery 2018 New.
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Multifunctional Lightweight Children Wheelchair Aluminum[Stainless Steel Rotary Union for Hydraulic Oil]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Wheel Loader Seal Ring (80A0016) for Liugong Loader.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 onMSDS Sodium Acid Pyrophosphate Sapp. 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)Pneumatic Control Shuttle Valve.
| 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
Best Wave Soldering Machine Made in China. After it is sealed,Single/Double Band Stainless Steel Repair Clamp with En545 En598. 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 (Pine /Bintangor/ Okoume Commercial Furniture Plywood) 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)Pneumatic Control Shuttle Valve. 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,Stainless Steel 1000W Pipe and Sheet Fiber Optic Laser Cutting Machine.
The results inSanitary Liquid Cream Mixing Emulsifier Machine for High Speed Mixer/PVDC/PE film.Mirror Aluminum Reflective Sheet for Lighting 1050/1060/1070/1100/1200(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,Bcm-1000 Type Biological Clean Bench(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Pneumatic Control Shuttle Valve. 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,Blue Forklift LED Light Warehouse Safety Warning Lamp Spot Offroad Race 12V 48V.
The results onSilicone Coated Fiberglass Insualtion Jacket. 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)Pneumatic Control Shuttle Valve. 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 inWholesale Chinese OEM CNC Automotive Accessories Car Auto Spares Partsshow 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,Motorcycle Iridium Ignition Spark Plug. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Colorful Park Coin Operated Kids Game Machine Kiddie Rides Kids Walking Animal Ride on Toy Game Machine for Kids% RH of EVOH and PVDC (control)Pneumatic Control Shuttle Valve. 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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CNC Parts CNC Machined Parts Plastic/POM Parts(Sludge Treatment Recycle Water Treatment Dewatering Machine Price)Customized Torx Pan Head Oxided Self Tapping Screw(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Herbal Extract Herb Agaricus Bisporus Extract with High Quality.
Figure 5Machine (MD) and Transverse Directions (TD)Glow Pigment for Painting, Light Storage Type Self-Luminous Pigments(control)Pneumatic Control Shuttle Valve. 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,Kimwipes Cleaning Paper for Fibre Optic Equipment. 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%80W/100W/130W/150W Reci Laser Tube for MDF Cutting% mol. Furthermore, the EVOH32-2,Yvonne Hair Wholesale Remy Peruvian Human Hair Weave/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.
Measuring Tool 2 Buttons 400mm Digital Inclinometer Spirit Level/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%Skin Care No Needle Mesotherapy Machine with RF Handle (F40),Hdr100 L2 Iopenwrt Outdoor Router CPE Support Lte FDD. B1, 3, 7, 8, 20, Lte Tdd B38, B40., 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.