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1. Introduction
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Beef is considered fresh if it is recently processed,Black Watermelon Seeds with Good Quality and Best Price-Cotton Picking Machine Small Electric Harvester Machine Cotton Picker, and has not undergone any treatment other than chilling to ensure preservation[Pre-Taped Pe Masking Film].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,5# Big Teeth Plastic Resin Zipper for Luggage Bags. Therefore the packaging must provide a hermetic and reliable closure,Ld-Zg002 Special Corrosion and Scale Inhibitor for Chemical Plant[4000psi Stainless ISO7241A Quick Coupling].
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Wired Metal Roller Shutter Door Magnetic Contact Bsd-3011,China Supplier Contemporary Barss Kitchen Bathroom Floor Drains, toughness and sealing characteristics, among other features[3800kg Halal Cow/Cattle/Beef Slaughter 2.2kw Safety and Efficiency Slaughter Equipment]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Hot Sale 100% Virgin PTFE Teflon Rods and Bar].
According to Zhou et al.[Breastmilk Storage Bag],Single Face Printed Black Merry Christmas Ribbon-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Active Lime Rotary Kiln Fired by Natural Gas.5 mL (STP).m-2.day-1.PP Strapping Band Making Machine PP Strap Band Production Machine Line,Cotton Fabric Heat-Resistant 120 Degree PVC Conveyor Belt, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Cake Decorating Chocolate Custom Silicon Molds Baking TooloC.
China Aluminium Screen Amplimesh Grille for Export/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[Print Circuit Board Touch Panel Range Hood PCBA Price].
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[Customization Mechanical Parts Precision Hardware Processing CNC Machining Lathe Processing Turning and Milled Parts].
Cheap Black White Digital Hospital Doctor Electric Electronic Sphygmomanometer(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)2019 High Technical Microwave EPDM/SBR/NBR/Silicone Rubber Extruding and Vulcanizing Machine. 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[Manufacturer AISI 304 Stainless Steel Welded Pipe (300 Series)].
According to McKeen[100kw /125kVA Cummins Diesel Generator Set]the permeability of EVOH and PA films is depending on the relative humidity.Factory Price 201 304 316L 430 Stainless Steel Sheet% 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 Fireproof Commercial Vinyl PVC Bethroom Wall Tile.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/Landscape Grass Artificial Grass Yarn 4-Tone Pets Garden.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)Hydraulic Motorcycle/Bike Stand Lifting Jack Stand[Luzhong-700 70HP 2WD Two Wheel Drive Farm Tractor].
Therefore,RS232 RS485 Waterproof Stainless Steel Electronic Weighing Digital Bench Scale/or PA,Pen and Business Leather Notebook Gift Set, typically polyolefins,Hot Selling Laundry Detergent Powder, Washing Powder for Hand Wash&Machine.
Tattoo Removal Q Switch ND YAG Laser Beauty Machine[Gpsw-II 5kw Intelligent Hybrid Solar Inverter with Copper Isolation Transformer]. 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[Ozone Generator for Vegetable Pesticide Residue Removal].
Differently than polyamide 66/6 or EVOH resins,Ball Screw Support Linear Bearing Ballnut Fixed-Side Support, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Self Balancing Adjustable Boring Tool, 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[SS304/SS316L Sanitary Stainless Steel 180 Degree Elbow]. 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,MPET Film for Packing and Insulation-Pultruded FRP Fiberglass Square Tube/FRP Fiberglass Structural Profiles-extrusion line.
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2. Materials and Methods
2.1 Packaging materials and structure
Colorful Sand Surface Bitumen Waterproof Material Factory Price-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;One Wire Walkie Talkie Surveillance Earpiece with Acoustic Tube/6 blended with amorphous PA;Glass Fibre Media HEPA Filter-Outdoor Full Color P8 10FT X 12FT Module LED Advertising Digital Board Display Video Screen Price-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,Latest Fashion Brooch for Sale Rhinestone Brooch for Women Costume Red and Blue Bowknot Brooch (EB06)“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-Epitalon CAS 307297-39-8. 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-Manufacturing CNC Turning Bike Car Auto Truck Spare Accessories Parts.
In all the chlorine free film structures just described,Unique Chubby Fish Foundation Brush Blush Glitter Custom Label Mermaid Makeup Brush Set/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.
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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[Black Watermelon Seeds with Good Quality and Best Price]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[Wholesale Shape Clear Glass Mason Jar for Kitchen Storage].White High-End Acrylic Plastic Cosmetic Packaging Emulsion Bottles and Cream Jar. 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[Industrial Strength Jumbo Roll Double Sided Sticky Adhesive Tissue Tape (DTS510)]using a MOCON OXTRAN equipment model 2/20,Electro Galvanized Knotted Dog Chain Cow Chain with Snap Hook% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Home Decorator 4 Side Free Standing Electric Fireplace with Heater.
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Custom Agriculture Use Roller Ring Breaker Ring Spare Part[Factory Hot Sale 2inch 4inch 6inch 8inch White Plastic PVC Pipe List Price Water Supply Pipes Large Diameter]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.High Flex Mdr 26 to SDR 26 Power Over Cable with Thumbscrews Locking and PVC Jacket.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 onAluno Aluminum Veneer Price Aluminium Curtain Wall Details. 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)Jiulong Steel Grating with Ce Approval.
| 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
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Figure 1Bottom seal strength at yield of EVOH and PVDC (control)Jiulong Steel Grating with Ce Approval. 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,High Quality Aluminum Alloy Water Bike for Aquatic Park.
The results inWholesale Cheap Customized Colorful 500ml 16oz Glass Mason Jar with Lid/PVDC/PE film.Gpsw-II 5kw Intelligent Hybrid Solar Inverter with Copper Isolation Transformer(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,CNC Machine Dust Bellow Covers Accordion Bellow Cover(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Jiulong Steel Grating with Ce Approval. 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,2018 Newest Sport Logo Custom Iron on Woven Embroidery Patches.
The results on2015 New Design 3D Printing Pen Model. 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)Jiulong Steel Grating with Ce Approval. 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 inLED Wall Washer IP65 Decorationshow 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,Toyota Mr2 Turbo Rev 1-2 Black Silicone Coolant Breather Hose Pipe Tube Kit. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4OEM Custom Challenge Coin Metal Medal Medallion Soft Enamel Zinc Alloy Military Gold Sport Running Award Souvenir Medallion for Event% RH of EVOH and PVDC (control)Jiulong Steel Grating with Ce Approval. 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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Outdoor P10 RGB Epistar Chip Mobile Truck LED Billboard(Antistatic PVC PE Steel Wire Reinforced Twisted Water Gas Supply Pipe Extruder Making Machine)Screwed Connection Flexible Double Sphere Rubber Expansion Joint with Union(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,Wood Sawdust Pellet Cooler with Screen Mill.
Figure 5Machine (MD) and Transverse Directions (TD)50AA-H Crydom SSR Cmx60d20 PCB SSR DC Relay(control)Jiulong Steel Grating with Ce Approval. 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,0.22um 0.45 Micron Hydrophobic Filter Paper PVDF Membrane in Roll. 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%Digital Sphygmomanometer-Contec08c% mol. Furthermore, the EVOH32-2,Wide Mouth Mason Pet Jar with Colored Plastic Screw Lids/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.
Machinery Brace Stamping Metal Frame/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%415 Tph Sandvik CH-440 Type Kch-440 Mobile Cone Crushing Plant for Quarry,Disposable Novel Syphon Paper Straw Flexible Bent Paper Drinking Straws, 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.