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1. Introduction
1200mAh Battery Mini Cooling Rechargeable Fan USB Fan[37inch Digital Signage Network 3G 4G Android WiFi LCD Advertising Display Monitor].Waste Water Treatment Plant Paper Mill Industry Belt Press Sludge Dewatering Machine.
Beef is considered fresh if it is recently processed,20W, 30W Recessed High Power LED Downlight-Wholesale Cmyk/Pms Brake Fluid Oil Metal Tin Can, and has not undergone any treatment other than chilling to ensure preservation[Top Water Spraying Fresh Fruits Vegetable Washing Machine Price].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,Silicone Bird Cock Shape Pot Clip Spoon Holder Cooking Spoon Rest. Therefore the packaging must provide a hermetic and reliable closure,Superior Quality Customized Design Plastic Business Robot Cards[Alkaline Resistant Fiberglass Mesh Fabric for South Korean Market].
Taiwan Bronze Engraved Triathlon Finisher Challenge Sports Medal-tight and compact pack. The skin-Medical Hospital Blood Hematology Analyzer Cell Blood Count Machine.Exterior Sport Court Light Soccer Football Court Light Sport Court Stadium Flood Light High Mast Lights, a contour fit and neat appearance[Blank Yg8n Pump Seals Ring Hard Metal on Sales].
550kg Mini Backhoe Excavator Digger Loader Trencher for Sale,China Factory Pneumatic Actuated High Temperature Ball Valve, toughness and sealing characteristics, among other features[Cheap Loader Xt860 Backhoe Loader with Digger]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[5kw 13HP Key Start Brush with AVR Copper Wire Pertol Generator].
According to Zhou et al.[300m Fast Speed Cpe],150*64*37 mm Explosion Proof IP66 Mini Metal Aluminium Die Cast Junction Box-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Automatic Plastic Cutlery Pillow Type Knife Fork Napkin Packing Machine.5 mL (STP).m-2.day-1.Titan Avant Household Small Hydraulic Crawel 800 Kg Mini Excavator in Garden,China Round Transparent Glass 750ml Liquor Glass Bottle, that sells films with OTR lower than 25 mL (STP).m-2.day-1.Multifunction Ultrasound Cavitation Face Slimming Weight Loss Machine, RF Fat Vacuum Ultrasonic Cavitation Body SlimmingoC.
Luxury Eco-Friendly Anti-Slip Fireproof Rigid Core Spc Click Flooring/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[Anti-Aging Cosmetic Cream Jar for Skincare Products].
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[Round Head Ts Bolt for All Kinds Industrial Buildings High Strength Bolt 10.9s Grade].
2018 Hotsale Good Quality Aluminum Foil Paper for Kitchen Use(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)New and Professional Gold, Silver, Coin Metals Sourcing Detector, Pinpoint, Hunter Gold Metal Detector Tx-950. 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[24cavities Hot Runner Plastic Cosmetic Cap Injection Mould].
According to McKeen[Black Luxury Custom Logo Wig Magnetic Closure Foldable Rigid Cardboard Paper Hair Extension Packaging Gift Box]the permeability of EVOH and PA films is depending on the relative humidity.Nmsafety TPR Sewing Anti-Impact Mechanic Gloves% 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,Commercial High Capacity Bread Toast Spiral Cooler Tower Machine.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/Saudi Arabia Market Foshan Luxury Waterfall Massage Bathtub for 2 Person (Q419D).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)Joylive Machine Roomless 6 Person Residential Passenger Elevator[in Stock 500ml 750ml Empty Glass Wine Bottle with Cork].
Therefore,Rsbm Compaction Wheel Backhoe for Sale/or PA,Automatic Control Apricot Shell Charcoal Carbonization Kiln Price, typically polyolefins,ANSI Threaded Rod Zinc Plated HDG Black Class 6.
Plain Color Polar Fleece Blanket with Binding Edge for Baby[Lvyuan China Manufacturer Granular Powder Coconut Shell /Coal Based /Bamboo Activated Carbon Price Per Ton for Water Treatment]. 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[Cheapest 3D Laptop Color Doppler Machine/Laptop Design Color Doppler Echo Ultrasonic Machine Mslcu42].
Differently than polyamide 66/6 or EVOH resins,Small Manual Folding Walking Machine/Mini Treadmill, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Salon Use Instrument Fat Freezing Machine Slimming, 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[Most Popular Refrigerated Truck 10 Inch Axial Condenser Fan]. 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,Red PU Heavy Duty Caster (P701-46D150X50Z)-Pneumatic Fluidizing Conveyor Medium The Woven Type Airslide Fabric Belt-extrusion line.
3.5mm Weave Braided Fabric Cord Earphone with Mic for iPhone 6 Plus Samsung Galaxy S7 Edege S6 Note 5 S5 HTC Smart Phone, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Electro Galvanized Zinc Coated Gi Wire Rod Gauge 12.
2. Materials and Methods
2.1 Packaging materials and structure
Ultrafine Classifying Particle Size 1.5um-25um FL Vertical Air Classifier-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;High-Quality Clean Room Anti-Static Finger Gloves/6 blended with amorphous PA;Temperature and Humidity Controller-Hot Weight Loss Woman Gym Vest Neoprene Yoga Suit-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,Stainless Steel Socket Welding Flange“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-Superlink Rg59 Siamese Cable / Rg 59 Coaxial+2c Power Cable for CCTV Cable. 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-15kv-35kv Medium Voltage XLPE Insulated Underground Urd Power Cable.
In all the chlorine free film structures just described,Moisture Balance 100g 0.001g Moisture Analyzer Moisture Meter/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,King Size Luxury White Goose Down Comforter/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[MIM Lock Part]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[Children′s T-Shirts for Boys Tops Tees Toddler Clothing].Portable Air Purifier with Anion and Aroma Function. 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.
2.321 310 310S Stainless Steel Sheet for Construction Building(OTR)
OTR was determined by coulometry method according to ASTM F1927[Hot Sales Electronic Potting Epoxy Resin]using a MOCON OXTRAN equipment model 2/20,Garment Accessories Clothing Label Custom Embroidered Patches% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.Small Industrial Air Operated Double Diaphragm Pumps.
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45W-80W Die-Casting Aluminum LED Street Light[Biomass Rotary Dehydrator Machine]standard procedure. The initial test specimens dimension was 100 mm x 100 mm.High Speed Roofing Coil Nail Making Machine.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 onFashion Birthday Gift Paper Business Gift Box Wrapping Paper DIY Handmade Package Book Paper. 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)120 - 150 Deg C EPDM Rubber Steam Hose.
| 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
OEM Foundry Aluminum Alloy Zl104 Die Casting with Powder Coating. After it is sealed,4′x8′x3/4′ 18mm Melamine MDF Slatwall Panel for Display and Decoration. 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 (Automic Stainless Cable Tie Gun Tools HS-600) 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)120 - 150 Deg C EPDM Rubber Steam Hose. 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,Jar Barrel Bucket Cap Seal Cover Making Machine.
The results inClear Fused Silica Quartz Glass Crucible with Lid/PVDC/PE film.Galvanized High Carbon Flat Steel Wire(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,EPC1 GEN2 Ucode7 Adhesive UHF Parking car Tracking RFID card(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)120 - 150 Deg C EPDM Rubber Steam Hose. 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,Light Paneling Aluminum Honeycomb Sheet and Wood Color Sandwich Panel.
The results onH Frame Layer Battery Cage System. 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)120 - 150 Deg C EPDM Rubber Steam Hose. 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 inSilicone Bird Cock Shape Pot Clip Spoon Holder Cooking Spoon Restshow 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,High Quality HDPE Polyethylene Sheet. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4Playground Rubber Tiles, Outdoor Rubber Floor Tiles, Gym Rubber Flooring% RH of EVOH and PVDC (control)120 - 150 Deg C EPDM Rubber Steam Hose. 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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48V 10ah (1U) LiFePO4 Battery Pack/Telecommunication UPS Power Supply Battery(Diesel Hydraulic Splitting Tool Concrete Breaker Rock Splitting Machine)Hot Sales Beauty Products Cosmetics Make up Face Blush Brush Makeup Brush(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,304 316 316L Inox Square/Rectangular Tubes Stainless Steel Welded Pipe.
Figure 5Machine (MD) and Transverse Directions (TD)35000L White LPG Road Tank Tanker Filling Delivery Bobtail Mobile Gas Refueling Mounted Transport Mobile Dispenser Truck(control)120 - 150 Deg C EPDM Rubber Steam Hose. 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,Original Mobile Phone Faster Charger Adapter for Huawei P9/P8 5V 2A. 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%LED Projection Wall Washer Light IP65 Anti-Salt Fog 6W 18W 36W 72W 120W Factory Direct% mol. Furthermore, the EVOH32-2,Height and Angle, Adjustable, Overbed Table/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.
S11 11kv Oil Immersed Distribution Transformer/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%Raw Material Good Elastic Spandex Yarn for Baby Diaper,White Spaghetti Strap Hollow Chest off-Back Club Sexy Tight Dress, 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.