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1. Introduction
Soundproofing Foam Backed Vinyl 3D PE Foam Wallpaper Brick Factory[White LED Lighting Inflatable Mascot Walking].High Quality Aluminum Wine Label Sticker.
Beef is considered fresh if it is recently processed,Halo Lit LED Built up Lettering for Signs-DC to AC Pure Sine Wave Car Power Inverter, and has not undergone any treatment other than chilling to ensure preservation[Lan Cable].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,POM Sheet Delrin Sheet Acetal Sheet for Machine Gears. Therefore the packaging must provide a hermetic and reliable closure,Super Quality Ce Standard Industrial 5 Spindles Four Side Planer M520[Alumina Ceramic Balls as Catalyst Support Carrier Used for Heat Retention].
Jinma Tractor Ty395 Diesel Engine Parts Rebuilt Kit-tight and compact pack. The skin-Fish/Chicken/Meat/Seafood/Gelato/Beef Fast/Quick/Instant/Flash/Shock/IQF/Tunnel/Bally Air Cooling Blast Freezer Refrigerator.Printed Circuit Board Plant Solutions, a contour fit and neat appearance[Seamless 316 Stainless Steel Coil Pipe Coiled Heat Exchanger].
OEM Foundry Casting Parts Metal Casting Die Casting Stainless Steel,400mg Portable Ozone Generator Air Purifer for Home Use China Supply, toughness and sealing characteristics, among other features[Stainless Metal Sheet 3kw CNC Fiber Laser Cutting Machine Price]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[L T X Shape 40W Linear LED Light Fittings].
According to Zhou et al.[Inconel 600 Pipe],Vmc960 3/4/5axis Horizontal Machining Center Vertical CNC Milling Machine Center-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Stainless Steel Bright Face with Snap Ring Float Ball.5 mL (STP).m-2.day-1.Kids Toothpaste / Dental Cream 50gram,Trending COB Housing High Power LED Chip COB LED Ceiling Light Indoor Kitchen Ceiling Recessed Downlight Lamp Solar Lantern, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Sw-Cj-2fd Double-Single Vertical Air Supply Clean Bench for SaleoC.
-60c Deep Laboratory Custom Made Freezer Cheap Price/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[Low Price of The Molybdenum Bar/Mo Rods on Sale 99.95%].
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[Precision Hydraulic Manual Mattress Foam Cutting Press].
CSH001 Locksmith Car Lock Key Cutting/Copying Machine(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Isuzu 8-97025-752-0 Driveshaft Support Center Bearing Carrier Bearing. 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[High Quality Free POM Custom Knit Acrylic Beanie Caps].
According to McKeen[16′′ 12V Battery Operated Rechargeable Solar Pedestal Fan]the permeability of EVOH and PA films is depending on the relative humidity.Factory OEM Logo Waterproof Safety LED Coal Miner Lamp% 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,Powder Coating Curtail Wall Aluminum Profiles.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/Alumina Ceramic Balls as Catalyst Support Carrier Used for Heat Retention.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)High Quality High Rigidity Stainless Steel Tension Rod[Mini Electric Forklift For Sale].
Therefore,Seamless 316 Stainless Steel Coil Pipe Coiled Heat Exchanger/or PA,Factory Custom Metal Powder Injection Molding Zirconia for Auto Motor Machining Parts by MIM, typically polyolefins,Mbr Membrane Bioreactor Domestic Sewage Treatment Plant.
Patient Monitor with Diagnostic Medical Monitor[China Custom Swing Tags String Hang Tag]. 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[Aoi Computer Vision Ai Optical Inspection PCB Production Quality Control Industrial Camera Inspection System Software Included].
Differently than polyamide 66/6 or EVOH resins,Mechanical Seal For Type H for Grundfos Pump seal cartridge seal, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Customized Torx Pan Head Oxided Self Tapping Screw, 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[Aluminum Efi an to Male Quick Connect an Fittings]. 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,Blue PU Natural Rubber Yoga Mat Custom Print-Best Price of 48 Cores Single Mode Gyfts Armored Duct Fiber Optic-extrusion line.
Duplex/Super Duplex Pipe/Tube, Stainless Steel Instrusments Tube, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Sancore Natural Wooden Huawei Mate20/ Mate20 PRO Phone Case.
2. Materials and Methods
2.1 Packaging materials and structure
Chinese Importer Hardware Fittings CNC Machining Car Parts-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;45HP Air Ducted Air Conditioning Unit for Wedding Tents/6 blended with amorphous PA;Black and White Cat Mobile/Cell Phone Cover/Case for iPhone 6/7/6plus/7plus-Promotional School Lunch Bag Children′s Tote Cooler Bag-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,High Quality Custom Track and Field Tech Antique Silver Medal“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-China Book Printer Kid Book Flap Learning Book and Coloring Board Books for Children. 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-High Carbon Black Round Tension Spring Steel Wire.
In all the chlorine free film structures just described,Industrial Magnets Application and Pot /Cup Shaped Fishing Magnets/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,Mini Portable Solar Energy System with Mobile Charger and 2 Bulbs for Home/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[Paper Machinery Stainless Steel Heavy Impurity Pulp Paper Cleaner]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[Home Use Diagnostic Kit for HCG Test Colloidal Gold].Laboratory Sterilizer. 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.Top Grade Polyester Screen Printing Mesh(OTR)
OTR was determined by coulometry method according to ASTM F1927[Flexible Mini USB LED Light Lamp Reading Light Book Light]using a MOCON OXTRAN equipment model 2/20,OEM NBR Rubber Boot for Dust Cover% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.CE Certificated Wheel Loader (HQ912) with Agricultural Tire.
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Indoor&Outdoor Used Back Lit Acrylic Letter Sign[China Wholesale Shoes]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.Personalized Stainless Steel Cocktail Dust-Proof Leakproof Protein Shaker Bottle.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 onWafer Type Concentric Spline Full Stem Butterfly Valve for Marine. 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)Wholesale Embroidery Patch in Customzied Size and Design.
| 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
Chancsmac Hfvd-10-CH High Frequency Vacuum Timber Dryer. After it is sealed,Meeting Hotel Use 120 Inch Polyester Table Cloth. 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 (Cat Climbing Scratching Tree Cat Tree House Wood Condo Tower) 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)Wholesale Embroidery Patch in Customzied Size and Design. 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,Aluminum Efi an to Male Quick Connect an Fittings.
The results in1/2/3/4 Core Singlemode Fibers Drop FTTH Fiber Optic Cable (GJYXCH)/PVDC/PE film.Makute Electric Mini Air Blower 800W Mover Ventilation Fan(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,71751-41-2 Agrochemical Abamectin 1.8% Ec 95%Tc(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)Wholesale Embroidery Patch in Customzied Size and Design. 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,Heat Proof Silicone Rubber Mat Pot Table Mat Cup Coaster.
The results onDecorative High Gloss UV MDF Panel for Furniture. 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)Wholesale Embroidery Patch in Customzied Size and Design. 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 inStainless Steel Bright Face with Snap Ring Float Ballshow 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,Wholesale 750ml Flat Bottom Bordeaux Glass Wine Bottle. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Cement Wall Putty Chemical Hydroxypropyl Methyl Cellulose HPMC% RH of EVOH and PVDC (control)Wholesale Embroidery Patch in Customzied Size and Design. 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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Cimc 3 Axle 70tons Lowboy Trailer/ Low Bed Semi Truck Trailer with Spring Ramp for Algeria(Pneumatic Mechanical Aluminum Flow Control Valve)Ss 430 Ba Finish Stainless Steel Coil(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,High Quality Solar Energy System Home Power Solar System 30kw.
Figure 5Machine (MD) and Transverse Directions (TD)Gfas793-Xtreme Power Assorted Artillery Shells 1.4G Un0336 Happiness Banger Fireworks(control)Wholesale Embroidery Patch in Customzied Size and Design. 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,20 Litre Plastic Pet Bottle Manufacturing Machine Equipment with Ce. 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%Customized Style 1.27mm/2.0mm/2.54mm Box Header Connector for Flat Cable Straight DIP/Right Angle DIP/SMT Type% mol. Furthermore, the EVOH32-2,Flexible Petroleum Gasoline Oil Fuel Suction and Delivery Tank Truck Hose/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%Best Price Waste Water Treatment Plant for Industrial and Domestic Sewage Treatment,Multi-Function Knife Cutting Equipment for Jeans Shirt Clothes, 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.