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Moisture transmission rate

The films were biaxially oriented at ratios of 3 1-8 1. They had low moisture transmission rate, toughness, abrasion resistance, good clarity and gloss, suitable as moisture barrier packaging for food, pharmaceuticals, and electronics... [Pg.1688]

Millad 3988 clarifier is used to produce coextruded blown PP film at 15% lower cost. In comparison with BOPP, blown PP film has improved haze values, gloss, stiffness, and moisture transmission rates. Ingenia Polymers manufactures a high-clarity antiblock mas-terbatch for PE blown film that produces lower haze than conventional diatomaceous earth antiblocks commonly used for blown film (13.5%, at loadings from 1500 to 15,000 ppm compared to haze of 9-19% for diatomaceous earth). ... [Pg.99]

Moisture transmission rate (MTR) See Water vapor transmission rate (WVTR)... [Pg.658]

Water vapor transmission rate (WVTR) (film characterization) The amount of water vapor transmitted through a film in units of amount per unit area per unit time (g/m -d). Also called Moisture transmission rate (MTR) or Water vapor permeability. [Pg.730]

MTR Material test report Moisture transmission rate... [Pg.766]

The effect of plasticizers and temperature on the permeabiUty of small molecules in a typical vinyUdene chloride copolymer has been studied thoroughly. The oxygen permeabiUty doubles with the addition of about 1.7 parts per hundred resin (phr) of common plasticizers, or a temperature increase of 8°C (91). The effects of temperature and plasticizer on the permeabiUty are shown in Figure 4. The moisture (water) vapor transmission rate (MVTR or WVTR) doubles with the addition of about 3.5 phr of common plasticizers (92). The dependence of the WVTR on temperature is a Htde more comphcated. WVTR is commonly reported at a constant difference in relative humidity and not at a constant partial pressure difference. WVTR is a mixed term that increases with increasing temperature because both the fundamental permeabiUty and the fundamental partial pressure at constant relative humidity increase. Carbon dioxide permeabiUty doubles with the addition of about 1.8 phr of common plasticizers, or a temperature increase of 7°C (93). [Pg.435]

MethylceUulose reduces surface and interfacial tension. MethylceUulose forms high strength films and sheets that are clear, water-soluble, and oU-and grease-resistant, and have low oxygen and moisture vapor transmission rates (see Barrier polymers). [Pg.489]

Certain copolymers of this type have been found to have excellent gas barrier properties, with the dry polymer having an oxygen permeability only about 1/lOth that of polyvinylidene chloride. Unsurprisingly, the copolymer has a high moisture absorption and a high moisture vapour transmission rate. Where the material is swollen by water, gas permeability is also higher. [Pg.394]

Material Thickness of film plus adhesive (mm) Tensile strength (kg/cm width) Elongation at break (%) Moisture absorp- tion (%) Moisture- vapour transmission rate (g/m per 24 h Dielectric strength (V)... [Pg.666]

There are substantial differences in the rates at which water vapor and other gases can permeate different plastics. For instance, PE is a good barrier for moisture or water vapor, but other gases can permeate it rather readily. Nylon, on the other hand, is a poor barrier to water vapor but a good one to other vapors. The permeability of plastic films is reported in various units, often in grams or cubic centimeters of gas per 100 in.2 per mil of thickness (0.001 in.) of film per twenty-four hours. The transmission rates are influenced by such different factors, as pressure and temperature differentials on opposite sides of the film. [Pg.306]

Moisture vapor transmission rate (MVTR), for VDC copolymers, 25 709-710 Molality, 15 751 Molar absorptivity, 14 237 Molar flux, 15 678 Molar Gibbs energy, 24 660, 662 Molarity, 15 751... [Pg.594]

Following are the tests described in this Spec wet tensile strength, adhesion at low temp, moisture-vapor transmission rate, water-penetration rate corrosion, accelerated aging, dry tensile strength and tearing resistance... [Pg.103]

Fillers often have a significant effect on the moisture resistance, the moisture-vapor transmission rate, and the solvent and chemical resistance of the cured adhesive bond. The effect, however, can be in either direction. Some fillers such as calcium carbonate tend to lower acid resistance, whereas others, such as silica or aluminum, may tend to lower alkali resistance. [Pg.177]

Diaphragm having very low moisture vapor transmission rate, used over generator outlets to provide a hermetic seal. [Pg.173]

Plastic Suppliers Inc., a US extruder of blown film for labels and envelopes, has produced the world s first blown film from NatureWorks PLA. It was hitherto thought that PLA was unsuitable for blown film extrusion. Plastic Supplies claims that its EarthFirst film is 100% compostable, has high gloss, optimum clarity and transparency, high moisture vapour transmission rate, flavour retention, odour barrier, is breathable and is US Food and Drug Administration (FDA) compliant. Areas of application for EarthFirst include window carton film for food packaging, label film, floral wrap film, shrink film and envelope film. [Pg.69]

Gas barrier properties - Metabolix PHA polymers have lower moisture vapour transmission rates than other biodegradable polymers. The oxygen transmission rates for unoriented PHA films are 25-30 cc-mil/(100 in2-day) at 77 °C, 0% relative humidity. [Pg.80]

While biodegradable polymers may be similar to petrochemical-based thermoplastics in terms of their structure, their chemical structure imbues them with technical properties that make them perform in different ways. For example, starch blends can produce film with better moisture barrier protection and higher clarity than some conventional plastics. PLA has a high water vapour transmission rate, which is beneficial for fresh food applications where it is important that the water vapour escapes quickly from the packaging. PLA also reduces fogging on the lid of the packaging. [Pg.167]

Moisture Protection of SEPIFILM LP Water vapor transmission rates were measured on free films, including titanium dioxide (Figure 27). SEPIFILM LP shows significantly lower moisture permeability compared to regular or PVA-based coating formulations. Removal of titanium dioxide (SEPIFILM LP clear) improves moisture resistance. [Pg.1022]

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See also in sourсe #XX -- [ Pg.99 ]



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