摘要:
The invention is a method, triggering unit, and system for activating an oxygen scavenging composition at high speeds. The triggering unit includes a plurality of UV lamps that can operate at increased temperatures and have high output intensites from about 10 to 35 mW/cm2. The triggering unit can activate films at speeds from about 20 to 100 fps. Mercury amalgam lamps are useful in the practice of the invention. The invention also includes a UV dose management system and film tensioning system that facilitates triggering at high film speeds. The UV dose management system controls the amount of UV exposure that the film receives so that the oxygen scavenging rate of the activated composition can be controlled.
摘要翻译:本发明是一种高速激活氧气清除组合物的方法,触发单元和系统。 触发单元包括多个可在增加的温度下操作并具有约10至35mW / cm 2的高输出强度的UV灯。 触发单元可以以大约20至100fps的速度激活胶片。 汞合金灯在本发明的实践中是有用的。 本发明还包括一种UV剂量管理系统和薄膜张紧系统,其有助于以高胶片速度触发。 UV剂量管理系统控制膜接收的UV暴露量,从而可以控制活化组合物的除氧速率。
摘要:
A method of triggering a film containing an oxygen scavenger includes providing composition including a peroxide; and packaging the composition in a film including an oxygen scavenger; whereby the oxygen scavenger is triggered in the absence of ultraviolet light, visible light, and electron beam radiation by exposure to the peroxide or an associated enriched oxygen environment.
摘要:
An intercalated layered silicate comprises a layered silicate and an intercalating agent sorbed between the silicate layers of the layered silicate. The amount of intercalating agent is effective to provide an average interlayer spacing between the silicate layers of at least about 20 Å. The intercalating agent has a formula selected from formulas I through VII described herein. The intercalated layered silicate may be exfoliated by mixing it with a matrix medium and adding sufficient energy to form a dispersed-particle composition. A packaging film, such as a food packaging film, may comprise the dispersed-particle composition.
摘要:
A method of activating the shrink characteristic of a film comprises two steps. First, a film comprising one or more thermoplastic polymers and at least about 0.01 weight % photothermic material is provided. Second, the film is exposed to an amount of non-ionizing radiation effective for the photothermic material to generate heat to cause an effect selected from one or more of: 1) shrinking the film by at least about 5% in at least one direction, and 2) increasing the tension in the film by at least about 50 pounds per square inch in at least one direction.
摘要:
An article, such as a polymeric film, sachet, purge control pad, or label, includes a sulfur scavenger. In some embodiments, an oxygen scavenger is also included. A method includes providing an article, including a sulfur scavenger and an oxygen scavenger; and subjecting the article to a dosage of actinic radiation effective to trigger the oxygen scavenger. A method of reducing the sulfur content of a package containing a food product includes either (1) providing a film including a layer including a zinc ionomer, and a layer including an oxygen scavenger; packaging the food product in the film; and storing the package for at least 24 hours; or (2) providing the food product at a temperature of ≦40° F.; providing a film including a layer including a sulfur scavenger; packaging the food product in the film; and storing the package for at least 24 hours.
摘要:
An oxygen scavenger composition includes an organic oxygen scavenger, a transition metal catalyst, and a blend of at least two photoinitiators selected from 1,3,5-tris(4-benzoylphenyl)benzene, thioxanthone derivative, acyl phenylphosphineoxide derivative, and diphenyl sulfide derivative. A film includes at least one layer including an organic oxygen scavenger, a transition metal catalyst, and a blend of at least two photoinitiators selected from 1,3,5-tris(4-benzoylphenyl)benzene, thioxanthone derivative, acyl phenylphosphineoxide derivative, and diphenyl sulfide derivative. A method of triggering an oxygen scavenger composition includes providing an oxygen scavenger composition including an organic oxygen scavenger, a transition metal catalyst, and a blend of at least two of 1,3,5-tris(4-benzoylphenyl)benzene, thioxanthone derivative, acyl phenylphosphineoxide derivative, and diphenyl sulfide derivative; and subjecting the oxygen scavenger composition to a dosage of actinic radiation effective to trigger the oxygen scavenger composition.
摘要:
A multilayer oxygen barrier film includes at least one bulk layer and a microlayer section including a plurality of adjoining microlayers including ethylene/vinyl alcohol copolymer, wherein the plurality of adjoining microlayers includes at least one microlayer including a first ethylene/vinyl alcohol copolymer having a first ethylene content, and at least one microlayer including a second ethylene/vinyl alcohol copolymer having an ethylene content different from the ethylene content of the first ethylene/vinyl alcohol copolymer. Methods of making a multilayer oxygen barrier film are also disclosed, e.g. in which a bulk layer is extruded, a plurality of adjoining microlayers is coextruded to form a microlayer section; and said bulk layer and microlayer section are merged to form a multilayer film; wherein the plurality of adjoining microlayers is as recited above.
摘要:
The invention is a UV sensitive composition that undergoes a color change upon exposure to a predetermined dosage of UV-C radiation. The UV-C sensitive composition comprises a halogenated polymer, such as polyvinylidene chloride, that produces an acid upon exposure to UV radiation, and a pH sensitive dye. Upon exposure to UV-C radiation, the halogenated polymer undergoes degradation and produces HCl. The pH sensitive dye changes color as a result in an increase in HCl in the system. The composition may also include an acid scavenging composition and/or a diluent to control the amount of HCl produced in the system. The amount of HCl liberated from UV-C exposure may be selectively controlled so that a color change may be produced at a desired UV-C dosage. In some embodiments, the composition may be used to indicate a UV-C dosage from about 100 to 1600 mJ/cm2.
摘要翻译:本发明是在暴露于预定剂量的UV-C辐射时经历变色的UV敏感组合物。 UV-C敏感组合物包含在暴露于UV辐射时产生酸的卤代聚合物,例如聚偏二氯乙烯和pH敏感染料。 当暴露于UV-C辐射时,卤化聚合物发生降解并产生HCl。 pH敏感染料会改变颜色,导致系统中HCl的增加。 组合物还可以包括酸清除组合物和/或稀释剂以控制系统中产生的HCl的量。 可以选择性地控制从UV-C曝光释放的HCl的量,使得可以在期望的UV-C剂量下产生颜色变化。 在一些实施方案中,组合物可用于表示约100至1600mJ / cm 2的UV-C剂量。
摘要:
An oxygen scavenger film includes a layer including a blend of an oxygen scavenger and a polymer selected from high density polyethylene, polypropylene or a propylene copolymer, and a sealant layer. Alternatively, both the oxygen scavenging layer and the sealant layer include a polymer selected from high density polyethylene, polypropylene or a propylene copolymer. The hot tack strength of these films is at least 2.0 Newtons/inch at 135° C., according to ASTM F 1921-98, measured with DTC instrumentation.
摘要:
Culture devices for promoting the growth of microorganisms, especially anaerobic microorganisms, are disclosed. The culture devices include an oxygen scavenging material. In one aspect, the culture device includes a supporting substrate and a cover sheet affixed to at least one edge of the supporting substrate. At least one of the supporting substrate and cover sheet includes the oxygen scavenging material. In another aspect, the culture device is an article that includes a container, e.g. a pouch, including a film having an oxygen scavenging material, with a culture media placed within the container.