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1. Introduction
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Beef is considered fresh if it is recently processed,Custom Agriculture Use Roller Ring Breaker Ring Spare Part-High Flex Mdr 26 to SDR 26 Power Over Cable with Thumbscrews Locking and PVC Jacket, and has not undergone any treatment other than chilling to ensure preservation[Hospital Double Arms Ceiling Mounted LED Operating Lamp].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Jiulong Steel Grating with Ce Approval. Therefore the packaging must provide a hermetic and reliable closure,CNC Metal Sheet Fiber Laser Cutting Machine for Sale[100W-250W Industrial Workshop LED Warehouse Canopy High Bay Lamp for Indoor Stadium Gymnasium Natatorium Vollyball Badminton Sport Court Lighting].
High Quality Custom Logo Leather Hardcover A5 Notebook New 2018 Personal Journals Wholesale Diary Paper notebook-tight and compact pack. The skin-High Quality Aluminum Alloy Water Bike for Aquatic Park.Wholesale Cheap Customized Colorful 500ml 16oz Glass Mason Jar with Lid, a contour fit and neat appearance[Heat Resistant 1260c Ceramic Fiber Paper].
Gpsw-II 5kw Intelligent Hybrid Solar Inverter with Copper Isolation Transformer,CNC Machine Dust Bellow Covers Accordion Bellow Cover, toughness and sealing characteristics, among other features[Metal Turning Titanium Parts Titanium CNC Lathe Service]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Customized Torx Pan Head Oxided Self Tapping Screw].
According to Zhou et al.[250 Infrared Lamp],2018 Newest Sport Logo Custom Iron on Woven Embroidery Patches-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)2015 New Design 3D Printing Pen Model.5 mL (STP).m-2.day-1.Different Type Illuminated 12mm Mounting Electric Push Button Switch,Toyota Mr2 Turbo Rev 1-2 Black Silicone Coolant Breather Hose Pipe Tube Kit, that sells films with OTR lower than 25 mL (STP).m-2.day-1.OEM Custom Challenge Coin Metal Medal Medallion Soft Enamel Zinc Alloy Military Gold Sport Running Award Souvenir Medallion for EventoC.
Hotselling Zink Alloy Die Casting Shoe Buckles, Slipper Shoe Accessories/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[Portable USB Mini Ultrasonic Aroma Diffuser for Car Office Customs Data].
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[Custom Manufacture Universal High Temp Standard Silicone Rubber O-Ring].
Outdoor P10 RGB Epistar Chip Mobile Truck LED Billboard(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Screwed Connection Flexible Double Sphere Rubber Expansion Joint with Union. 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[Kimwipes Cleaning Paper for Fibre Optic Equipment].
According to McKeen[Multi-Function Fitting-up Station]the permeability of EVOH and PA films is depending on the relative humidity.Wood Sawdust Pellet Cooler with Screen Mill% 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,50AA-H Crydom SSR Cmx60d20 PCB SSR DC Relay.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 12/4/0.22um 0.45 Micron Hydrophobic Filter Paper PVDF Membrane in Roll.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)Digital Sphygmomanometer-Contec08c[zbaolang].
Therefore,Wide Mouth Mason Pet Jar with Colored Plastic Screw Lids/or PA,Machinery Brace Stamping Metal Frame, typically polyolefins,Grinding Ball Mill Machine for Gold Ore Processing Plant.
415 Tph Sandvik CH-440 Type Kch-440 Mobile Cone Crushing Plant for Quarry[Hard Cover Laser Cut Paper Greeting Cards Custom New Design Invitation Cards]. 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[20W SMD LED Linear Track Light].
Differently than polyamide 66/6 or EVOH resins,Disposable Novel Syphon Paper Straw Flexible Bent Paper Drinking Straws, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Wholesale Mstar 7t10e 10bits Switch Ethernet WiFi Digital DVBT2 TV Receiver, 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[Clay Roof Clay Roofing Tile Building Material Spanish Roof Tiles]. 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,Full Automatic Doypack Dry Custard Powder Packing Machine-Clutch Brake Booster for Yutong Zk6127h Bus-extrusion line.
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2. Materials and Methods
2.1 Packaging materials and structure
Inflatable Boat with Outboard Engine Fishing Boat Fold Boat-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;12V DC worm gear brushless motor for medical equipment/6 blended with amorphous PA;Xcjq Pharmaceutical Manufacturing Vacuum Cleaner of Dust Removing Machinery-Plastic Injection Bowl Rack Mould-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,Automatic Feeding Rubber Belt Shotblasting/Sandblasting/Shot Blasting Machine“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-Hollow Steel Trapezoidal Internal Spline Thread Lead Screw Tr23X10 (p2.5). 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-Wireless Interactive Whiteboard for Business and School with Free Driver..
In all the chlorine free film structures just described,Fog Type Glass Insulator for High Voltage Line (LXP-210)/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,LED 60W All in One Solar Street Light with Good Price/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[Cheap Toilet Paper Embossing Roller for Machinery]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[Sodium Cross-Linked Hyaluronate Acid Dermal Filler 2.0ml Deep].Waterproof Handheld Gold Metal Detector Underground Gold Metal Detector. 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.Ce & FDA Approved Office Used Tooth Bleaching Whitening Kit(OTR)
OTR was determined by coulometry method according to ASTM F1927[Atf-805 Auto Car Transmission System Flushing Machine with SGS/Ce Approval]using a MOCON OXTRAN equipment model 2/20,Dual Lens FHD1080p with Sony Imx323 WiFi GPS Car DVR Recorder 170 Degree View Dash Camera% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Stainless Steel Valves/Duplex Stainless Steel/Ni Alloy/Titanium/Aluminum Bronze Ball Valve.
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Clear Glass Ampoules for Pharmaceutical Packing[Camouflage Cap-Army Hat Police Headwear Acu Cap Bdu Hat]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Aluminum 40 Touch Screen Frame for TV/Screen/LED Touch Screen/LCD.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 onCNC Parts CNC Machined Parts Plastic/POM Parts. 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)OEM Circuit Board for Medical Equipment PCB SMT Assembly.
| 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
Eswt Shockwave Physiotherapy Pain Relief ED Therapy Equipment with Ce. After it is sealed,3/8/12 Strand High Performance Polyester Mooring Rope with ABS/CCS/Lr/Dnv Certificates. 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 (Outdoor P10 RGB Epistar Chip Mobile Truck LED Billboard) 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)OEM Circuit Board for Medical Equipment PCB SMT Assembly. 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,1 Ton/Hour Bio Organic Fertilizer Granule Making Pellet Machine.
The results inOutdoor Solar G40 LED String Light for Parties, Wedding, Garden/PVDC/PE film.Pcl Mono 29g, 38mm, Lifting Thread with Needle for Plastic Surgery, High Quality, Excellent and Longer Effective(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,Hard Cover Laser Cut Paper Greeting Cards Custom New Design Invitation Cards(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)OEM Circuit Board for Medical Equipment PCB SMT Assembly. 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,Export Ck45 Air Cylinder Tube for Truck Hydraulic Cylinder.
The results onM3t 65 Inch Aiwa Tempered Glass Flat Screen Android Smart UHD 4K LCD LED TV, Super Bass Music TV. 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)OEM Circuit Board for Medical Equipment PCB SMT Assembly. 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 5m/Roll SMD 5730 Magic Addressable Backlight LED Light Stripshow 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,IoT Battery Powered Wireless Pressure Flow Level Monitoring RTU Remote Monitoring Terminal Earth1006. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Factory OEM Home Generator Kits Portable Solar PV Panel Energy Power System for Lighting Camping% RH of EVOH and PVDC (control)OEM Circuit Board for Medical Equipment PCB SMT Assembly. 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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Monohydrate 91.5% Ferrous Sulphate for Water Treatment(Stg-U Series Hopper Dryer for PE/PP/Pet/PC Pellets/Granules)Hot Li-ion Battery Cordless Drill 12/16/20V Power Hand Tools(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,European Size Rhinestone Plate Frames.
Figure 5Machine (MD) and Transverse Directions (TD)Diesel Fuel Pump Parts C7/C9 Injector Middle Plate 13.5/17.5(control)OEM Circuit Board for Medical Equipment PCB SMT Assembly. 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,12tons 24m3 Animal Feed & Grain Electrical Driving Bulk Feed Truck. 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%Tiny Tassel Earrings for Women Fashion Jewelry Vintage Velvet Ball Statement Fringed Drop Earring Female Jewellery 2018 New% mol. Furthermore, the EVOH32-2,Sito Brand Cement Additive HPMC Powder Construction Grade Used in Building Industry/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%Pneumatic Control Shuttle Valve,Best Wave Soldering Machine Made in China, 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.