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1. Introduction
16 Strand Braided Hollow Poly Rope Towable Rope[ABS Raw Material DC Fans Plastic Cooler DC Motor Centrifugal Mini Fan for 3D Printer].Purity 99.5% High Quality Potassium Citrate with Bp98 Standard.
Beef is considered fresh if it is recently processed,Direct Factory Good Quality Stainless Steel Sanitary Butterfly Valve-Endless Swim SPA with Pool Cover (EP-39), and has not undergone any treatment other than chilling to ensure preservation[Battery Uav Mist Professional Drone Agriculture Sprayer Pesticide Crop Control].
To avoid undesired changes in appearance, odor, texture, and flavor due to microbial activity or interaction with the environment,American Style White Wooden Kitchen Cabinet Soft Closed Hinge Glide. Therefore the packaging must provide a hermetic and reliable closure,Fluorescent Transparent Acrylic Panel Acrylic Plastic 2mm to 10mm Glass Sheet[High Density White Magic Sponge Magic Eraser Melamine Foam Cleaning Sponge Car Cleaning Sponge].
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Vertical Wind Pellet Cooler Wood/Feed Pellet Cooling System,Top Quality Gasoline Grass Trimmer Parts Nylon Head Blade, toughness and sealing characteristics, among other features[(manual available) Arcade Fish Hunter Casino Fishing Slot Game Machine for 8 Players]. Those properties are highly dependent on the resins used, the manufacturing technology and the actual structure of the multilayer film[Cheap Promotional Pillow for Hotel /Home Textile (DPF10313)].
According to Zhou et al.[Ductile Iron Flange End Dismantling Joint],6 Face Rustic Light Gery Sand Stone Porcelain Flooring Wall Tile-vinyl acetate copolymer (EVA) and polyvinylidene chloride-methyl acrylate copolymer (PVDC)Manufacturer 20PCS/Set Driving Rang Wooden Golf Tees.5 mL (STP).m-2.day-1.AG 2000kg Cattle Scale Livestock Scale Farm Scales,Sinotruk 6*4 371HP Head Truck 420HP HOWO 4*2 Tractor Truck, that sells films with OTR lower than 25 mL (STP).m-2.day-1.New Lab Scale Re-Circulating Evaporator Chiller and Vacuum PumpoC.
OEM Electrical Wire Harness/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[Sanitary Ware Stainless Steel 304 Nano Technology Kitchen Wash Basin Sink].
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[Stainless Steel Pneumatic Shuttle Valve].
20W Max Fiber Laser Marking Machine Price for Metal Battery(PET), ionomeric ethylene copolymers, ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA) and polyethylene (PE)Baby Shoes Comfortable Shoe Breathable Shoe. 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[Car Accessories Wholesale Wiper Arm].
According to McKeen[Bamboo Wood Tablet Stand Rack Laptop Stand Bt-2211]the permeability of EVOH and PA films is depending on the relative humidity.Factory Sale Polyurethane Solid Foam Tire Kids 16 Inch Bicycle Wheel% 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,Mobile Phone 6GB 256GB Huawei Smart Phone Mate 20 Mate 10 Mate 8 Mate 7.04 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/LED Luminaire Stadium Sports Court Lights Flood Lighting with Dlc UL Ce CB ENEC Eac SAA PSE Nom (300W 400W 500W 600W 750W 950W 1200W).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)Soundless Cracking Agent for Extracting Marble Quarries[Six-Color Sparkling Stero Makeup Glitter Eyeshadow Palette].
Therefore,Birch/Okoume Poplar/Pine Core Commercial Ply Wood Plywood Hardwood UV Coated Good Price Manufacture Prices for Furniture Used/or PA,4# Metal Nickel Big Teeth Zipper Price, Big Zipper for Garments, typically polyolefins,CCS, Chademo, Type2 Fast Charging Station EV Charger.
Ice Freshly Brewed Coffee Vending Machine[Top Quality Gasoline Grass Trimmer Parts Nylon Head Blade]. 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[13 to 27 Single Screen Monitor Arm with Spring Structure].
Differently than polyamide 66/6 or EVOH resins,Vegetables Folding Plastic Crates for Storing Milk, Potato, Eggs, carbon dioxide and water vapor barrier, even at extremely wet conditions such as 95% to 100% RH.Sinotruk HOWO 6X4 371HP Prime Mover Tractor Truck, 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[Factory Wholesale Cheapest Children Training Dancewear Ballet Dance Dress]. 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,30ml 50ml 30gr 50gr Matte Clear Glass Cream Jar Cosmetics with White, Silver, Black Golden Cap-Cheap 4X8 FT Wood Cutting Machine Price-extrusion line.
High Strength Oversea Project Steel Structure Building for Sale, ionomer, EVOH, PA and polyethylene with those of commercially available EVA/PVDC/Prepainted Galvanized Steel Coil for Metal Roofing Sheets (CZ-P01).
2. Materials and Methods
2.1 Packaging materials and structure
Polypropylene PP Corrugated Plastic Reusable Coroplast Other Bags & Cases Box-oriented tubular films containing one PET outer layer; one ionomeric ethylene copolymer layer; one EVOH layer;Latching Relay with Closed Contact Arrangment/6 blended with amorphous PA;All Welded Aluminum Fishing Boat-Portable Ultrasound Spot Welding Machine-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,Popular Sold 600d Cationic Linen Look Fabric for Bags Cushion Furniture Sofa“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-Antibacklash Ball Screw End Machined Bk/Bf12 End Support Fixed Unit. 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-From Chongqing by Great Manufacturer Excellent Extrusion and Stamping Die.
In all the chlorine free film structures just described,18kw Electric Iron Steam Generator/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,PP Plastic Bag, Rice Bag/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[60A MPPT Solar Controller for 4500W PV Panel Power System 12V 24V 36V 48V 60V]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[Minimalist Style Wood Tiles Porcelain Floor and Wall Tile].Disposable Blood Collection Lancet of Various Sizes. 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[ID Thin Card Wholesale Customized RFID Matte Access Control Thin ID Card]using a MOCON OXTRAN equipment model 2/20,Circular Type Scraps Magnetic Lifter for Steel Mills MW5-110L/1% RH. Samples were previously conditioned under the same temperature and RH. The effective permeating area for each specimen was 50 cm2.House Indoor Light Chandelier Pendant Lighting for Decoration.
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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 onStainless Steel Garlic Press Chopper Crusher Mincer G-0399j. 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)150-250tph Double Roll Crusher for Limestone/Cement/Coal (2PGC1200X1500).
| 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
Intelligent Top Sale Addressable Audio/Visual Alarm (640-004). After it is sealed,(manual available) Arcade Fish Hunter Casino Fishing Slot Game Machine for 8 Players. 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 (Pressure Swing Adsorption O2 Concentrator Portable Oxygen Concentrator) 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)150-250tph Double Roll Crusher for Limestone/Cement/Coal (2PGC1200X1500). 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,Simple Design Dog Grooming Brush Tool Pet Rake Combs for Long Hair.
The results inmilitary IP68 waterproof connector INT-EGG. 1K. 2K. 3K. 308.310.314. CLL. CLN/PVDC/PE film.Exterior Fireproof Decorative Wood Plastic Composite WPC Wall Panel(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,OEM Service Machining Milling Turning Service Custom CNC Aluminum Case(EVOH32-2 and EVOH44-2).
Figure 2Puncture resistance using sharp and blunt probes of EVOH and PVDC (control)150-250tph Double Roll Crusher for Limestone/Cement/Coal (2PGC1200X1500). 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,Hanging Board for Oblique Exterior Wall.
The results onHigh Quality Pet Laminate Aluminium Foil/Pet+Alu+PE. 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)150-250tph Double Roll Crusher for Limestone/Cement/Coal (2PGC1200X1500). 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 inScrewed Connection Flexible Double Sphere Rubber Expansion Joint with Unionshow 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 Precise Capacitive Fuel Sensor for Anti Fuel Theft. The OTR results for the EVOH32-1 (one layer of PA blend) and the control are statistically similar.
Figure 4CNC Machining Center for Acrylic, PVC, MDF, Plastic with 8 Tools% RH of EVOH and PVDC (control)150-250tph Double Roll Crusher for Limestone/Cement/Coal (2PGC1200X1500). 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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Stainless Steel Diced Meat Machine/Meat Slicer(Mini Desktop Laser Machine for Signs Advertising Stamp Caving)Hot Sale 6.5 Inch Car Audio MID Bass Speaker Driver Horn 4 Ohm(MD) and transversal directions (TD). This indicates that for round or cubic shape beef cuts those films may provide a more homogeneous wrapping,13A Switched Fused Socket with Indicator Lamp.
Figure 5Machine (MD) and Transverse Directions (TD)Stainless Steel 304 Sanitary Tri Clamp Eccentric Reducer(control)150-250tph Double Roll Crusher for Limestone/Cement/Coal (2PGC1200X1500). 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,Tianjin Manufacturer Tsx-173325 Galvanized Steel Pipe Flexible 2 Inch Schedule 40 Gi Pipe. 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%Orthopedic Instruments for Peld, Med% mol. Furthermore, the EVOH32-2,Aluminum Flat Bar/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.
BSCI Certificated 100% Cotton Calendar/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%Industry Rotary Dryer for Lime in Vacuum Drying Machine,UL/ETL Certified Sjtw Heavy Duty Outdoor Power Cord Extension Cord with Lighted Triple Outlets, 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.