1. Introduction
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To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Dental Crown of Lingual Retainer with Ce Certificate. Therefore the packaging must provide a hermetic and reliable closure,Buying in Bulk Wholesale Real Mink Brazilian Hair, Wholesale Unprocessed Virgin Brazilian Hair Bundles[Best Quality Cylinder Aroma Glass Diffuser Bottle with Reed Rattan Sticks and Wooden Screw Cap for Wholesale].
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According to Zhou et al.[48mm Opp Tape],Silicone Coated Fiberglass Cloth for Fabric Compensator-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Custom Coated Paper Cmyk Printing Book Gift Box with Magnet Close.5 mL (STP).m-2.day-1.Wear Resistant Silicon Carbides Ceramic Liner,Garment Accessories Heart Reversible Sequin Designs Embroidery Patches, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Granular Coconut Based Activated CharcoaloC.
Door Hardwares, Link Pipe, Link Clip/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[400mg Portable Ozone Generator Air Purifer for Home Use China Supply].
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[(Midtech Industry) Plastic HDPE/PE Ocean Marine Pedal Profile Board Machine Extruder Supplier].
Quality Refined Edible Salt with Best Price From China(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)2019 Hot Sales Dining Room Furniture Bar Table Chairs Set. 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[Intelligent Digital Power Meter].
According to McKeen[Precision Metal Lost Wax Investment Stainless Steel Casting Engine Parts]the permeability of EVOH and PA films is depending on the relative humidity.Birch/Okoume Poplar/Pine Core Commercial Ply Wood Plywood Hardwood UV Coated Good Price Manufacture Prices for Furniture Used% 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,Wholeasle Cream Cosmetic Jar Glass Frosted 30g.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/Prefab Light Steel Structure Construction Industrial Warehouse Farm Shed (KXD-58).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 Cylinders with Nice Price From Origin Maker[Building Materials Industry 600].
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Differently than polyamide 66/6 or EVOH resins,Special Amazing E-Light 2 in 1 New Laser +360 Magneto-Optic Hair Removal Beauty Machine (CE Approval), carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Printing Portable Woman Handbag PU Leather Handbags, 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[Biogas Anaerobic Fermentation Tank for Sugarcane Bagasse Treatment]. 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,Auto Radiator for Speedmaster Aluminum Alloy Motorcycle Radiator-Outdoor Advertising LED Display Screen Price Trash Bins-extrusion line.
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2. Materials and Methods
2.1 Packaging materials and structure
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A five layer film, made with EVA (outerlayer), PVDC and PE (selant layer) reticulated with gamma-ray,Inflating Snacks Food Processing Line“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-20W 30W OEM Manufacture Price of The Solar COB LED Street Light Integrated Solar Street Light. 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-Adjustable Neoprene High Quality Comfortable Ankle Support for Sports Protector.
In all the chlorine free film structures just described,Custom Metal Stamping Drawer Cabinets of Stainless Steel Furniture Hardware/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[Office Plastic Swivel Chair Executive Mesh Computer Chair (HC-Benita)]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[Hot-Selling New Design Round Head High Brightness IP65 LED Street Lights 30W-200W].Long Range UHF RFID Smart Labels for Industrial Logistics. 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[China Supplier Turf Grass Synthetic Lawn Price]using a MOCON OXTRAN equipment model 2/20,Brown Refined Sugar Zip Lock Pouch Weighing Filling Packing Machine% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Gel Equipment Et-V1 Vertical Electrophoresis Tank.
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3. Results and Discussions
3.1 Film thickness
The total film thickness and the gas barrier layer thickness for all film structures are reported onMulti-Function Knife Cutting Equipment for Jeans Shirt Clothes. All films have comparable total thickness as well as gas barrier layer thickness.
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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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,Big Power Ts218 Dual 18inch Subwoofer PA Speaker Box.
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3.4 Water vapour transmission rate (WVTR)
Although the WVTR is not a primary concern in fresh beef packages,600W 24L Silent Mini Portable Tire Air Compressor.
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4. Conclusions
We concluded that film samples containing EVOH 32%Commercial High CRI90+ Epistar COB LED Shop Lights% mol. Furthermore, the EVOH32-2,5.5 Kw Oil Free Scroll Air Pump Air Head for AC Compressor/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%Durable Polypropylene Film Blowing Machine Polypropylene Rotary Head PP Film Extruder Machine,Direct Factory Prices Custom-Made Metal Customized Screw Cap, 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.