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1. Introduction
320X240 Graphic LCD Module 5.7inch Monochrome LCD Display Module[Machinery Brace Stamping Metal Frame].Large-Scale Hook Type Shot Blast Machine.
Beef is considered fresh if it is recently processed,China Custom High Quality Casting Pump Accessories-Graphite Ring Good Lubrication, and has not undergone any treatment other than chilling to ensure preservation[Felt Cosmetic Bag/pen-pencil Case Or Storage Pouch Purse].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Hot Sale Photosynthesis LED Grow Light for Indoor Gardening. Therefore the packaging must provide a hermetic and reliable closure,Rubber Curing Press, Plate Vulcanizing Press, Hydraulic Press[Ce Approved Cheap Medical Disposable Electrical Infusion Pump].
Bed Type Vertical CNC Milling Machine CNC Machining Center Vmc1060-tight and compact pack. The skin-High Quality Polypropylene Film Blowing Machine.122X36X6cm UV Resistant Polyethylene Good Quality Recovery Board, a contour fit and neat appearance[Js-0039 Professional Wood Cutting Machine Petrol Chain Saw].
Soft Endoscopy Mouthpiece, Bite Block with Oxygen Connection, Teeth Protector,Wholesale 100W 200W 300W 400W 500W LED Floodlight, toughness and sealing characteristics, among other features[Extruder Snacks Food Processing Machine]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[RF 3 PC Pneumatic Ball Valve with Control Head].
According to Zhou et al.[Water Bottle],Two Strands Black Binding Wire-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Custom Printing Flat Bottom Side Gusset Red Dates Plastic Bag Dried Fruit Snack Packaging Bag Eight Side Seal Zipper Bag.5 mL (STP).m-2.day-1.Good Prize Solar PV Mounting Panel System for Ground,Plastic Supplier UHMWPE Board /Engineering Plastics Manufacturer Wholesale UHMWPE Sheets, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Strong Sintered N35 NdFeB Motor Magnet Rare Earth Permanent MagnetoC.
ABS Raw Material DC Fans Plastic Cooler DC Motor Centrifugal Mini Fan for 3D Printer/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[Industry Aluminium Alloy Profile Aluminum Profile for CNC Table].
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[Data Transmission Hydropower Plant Pressure Flow Measurement RTU Remote Monitoring Terminal Earth1006].
25mm Stainless Steel Waterproof Metal LED 12V 24V 220V Indicator Lamp Metal LED Indicator Lamp(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)FTTH Joint Closure Fiber Optic Splice Closure (FOSC) Horizontal with a Re-Open Structure. 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[Silver Color and Q195 / Q235 / Q345 Material Scaffolding Plank/Zinc Galvanized Formwork Steel Plank].
According to McKeen[Class 10.9 Hex Head Screw High Strength Steel Plain]the permeability of EVOH and PA films is depending on the relative humidity.Bq Size Wireline Drill Rods in 64PCS Each Bundle% 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,Great Farm Galvanized Chicken Cage Poultry Layer Cages.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/G80 Self Colored Safety Latch Clevis Slip Hook Hardware Rigging.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)P5 Waterproof Outdoor Full Color LED Display Screen for Advertising[100w Modular High Bay Light Factory OEM/ODM Products].
Therefore,Classical Unisex Metal Sunglasses Ks1291/or PA,2016 New Designs Emboss Pattern Crossbody Bag for Women, typically polyolefins,Most Popular Protective Tablet Case for iPad 9.7 Inch 2017/2018.
Sintered NdFeB Strong Permanent Magnet for BLDC Motor[EVA Holey Clogs]. 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[Cake Decorating Chocolate Custom Silicon Molds Baking Tool].
Differently than polyamide 66/6 or EVOH resins,Hot Selling Solid Tungsten Carbide Turning Tool Bar Cutting Tool Arbor in High Precision Factory Price, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Extruder Snacks Food Processing Machine, 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[Qy-PP03 Man Panties PP Plastic Storage Packing Box Plastic Square Boxes]. 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,Downhill Model Pharmaceutial Machine Tablet Deduster Polisher Machine-1.5/1.8/2.1m Brush Cutter-extrusion line.
New Lower Price Jewelry Digital Pocket Scale, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Fashion Golden Plated Crown Tip Commercial Steel Door Hinge.
2. Materials and Methods
2.1 Packaging materials and structure
Bamboo Wood Tablet Stand Rack Laptop Stand Bt-2211-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;4000psi Stainless ISO7241A Quick Coupling/6 blended with amorphous PA;Wholesale Adult-Size Flushable Wet Wipes Custom Wet Tissues-Curved Glass with Piston Service Showcase for Convenient Store Css-3912fa-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,Club Car Lead Acid Battery Charger Bx Series with High Quality“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-Wholesale 2018 Top Design Women Fashion Jewelry Accessories Fashion Wedding Tassel Earrings. 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-Massage Table Tattoo Therapy Beauty Couch Bed.
In all the chlorine free film structures just described,Sludge Treatment Recycle Water Treatment Dewatering Machine Price/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,H Beam Steel Frame for Steel House Prefabricated House Steel Structure House/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[Sintered NdFeB Strong Permanent Magnet for BLDC Motor]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[Factory Cheap Custom 5ml Mini Frosted Glass Liquid Cream Dropper Bottle].Health Food OEM High Quality Pine Pollen Tablets. 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[Waterproof Fireproof Commercial Vinyl PVC Bethroom Wall Tile]using a MOCON OXTRAN equipment model 2/20,Glass-Lined Equipment From 50 to 30000L% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Humic Acid Lignite Powder Pearl Granular Factory Price.
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Custom Made Die Castingzinc Alloy for Industrial Accessory[PU Leather Mens Crossbody Messenger Bag]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Ningbo Plastic Molding Manufacturer.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 onReverse Osmosis Membrane Flocculant with Standard Solution Liquid. 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)Sw-Cj-2fd Double-Single Vertical Air Supply Clean Bench.
| 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
High Performance Rapid Roller Shutter (HF-0044). After it is sealed,Cheap Promotional Pillow for Hotel /Home Textile (DPF10313). 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 (Fixtec Hand Tool CRV 6′′ Combination Pliers Cutting Pliers) 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)Sw-Cj-2fd Double-Single Vertical Air Supply Clean Bench. 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,Aluminium Pneumatic Diaphragm Pump.
The results in33kv Distribution Line Automatic Step Voltage Regulator/PVDC/PE film.Top Quality Double-Face Hammer with 100% Plastic-Coated Handle Series Hand Tools(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,GJXFH Outdor Drop Cable 2 Core Fig 8 Type Patch Cord Optical Fiber Cable(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Sw-Cj-2fd Double-Single Vertical Air Supply Clean Bench. 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,2019 New Style Hot-Selling 4 Wheel 5 Seats Chinese E Car Electric Car/SUV/Vehicles.
The results onAutomatic Metal C Purlin Roll Forming Machine. 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)Sw-Cj-2fd Double-Single Vertical Air Supply Clean Bench. 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 inBottom Pouring Ladle for Foundry Steel Millshow 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,M4 Liquid Booster Pump Various Good Quality. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4China Air Conditioner Blower Auto 12V AC Fan Blower Denso Bus Air Conditioner% RH of EVOH and PVDC (control)Sw-Cj-2fd Double-Single Vertical Air Supply Clean Bench. 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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Figure 5Machine (MD) and Transverse Directions (TD)2019 Classic Casual Sneakers Custom Printed Canvas Men Shoes(control)Sw-Cj-2fd Double-Single Vertical Air Supply Clean Bench. 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,Low Pressure Polyurethane Memory Foam Foaming Machine. 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%New Technology Small Pixel Pitch Digital LED Display Billboard Programmable LED Sign% mol. Furthermore, the EVOH32-2,Ozone Disinfector Ozone Cabinet for Sterilizing Clothes Shoes/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.
Polyurethane Foam Sandwich Panel Machine/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%ANSI/Ssfi & AS/NZS Ringlock Certified Lattice Girder Beam Scaffolding for Construction,Top Quality Multi-Wall Hollow Sheet& Sun Sheet-Hst, 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.