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Barrier film

A barrier composition which is injection mouldable and able to be made into a transparent film or incorporated (by co-extrusion and / or lamination) into multi-layer film products, the composition on dry basis: a) from 45 to 90% by weight of a starch and / or a modified starch selected from starches modified by reaction with a hydroxyl alkyl group, an acetate or a dicarboxylic acid anhydride or a grafting polymer; b) from 4 to 12% by weight of a water soluble polymer selected from polyvinyl alcohol, polyvinylacetate, and copolymers of ethylene and vinylalcohol which have a melting point compatible with the molten state of the starch components c) from 5 to 45% by weight of a non-crystallising mixture of sorbitol and at least one other plasticizer selected from glycerol, maltitol, xylitol, mannitol, glycerol trioleate, epoxidised linseed or soybean oil, tributyl citrate, acetyl tri-ethyl citrate, glyceryl triacetate, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate; polyethylene oxide or polyethylene glycol; d) from 0.3 to 2.5% by weight of a C12-22 fatty acid or salt; e) from 0.25% to 3% of an emulsifier system having a hydrophilic lipophilic balance value between 2 and 10. The barrier film may be co-injection moulded with polyethylene terephthalate (PET) or polylactic acid (PLA) for blow moulding into beverage bottles, with polyethylene (PE) or polypropylene (PP) or biodegradable polymers for high gas-barrier containers or closures, or may be co-extruded with polyethylene, polypropylene or polylactic acid for thin film packaging applications or for blow-moulded containers.
Owner:PLANTIC TECH

High dynamic satellite navigation signal rapid capture and tracking system and method

The invention relates to a high dynamic satellite navigation signal rapid capture and tracking system and method. The method comprises the following implementation steps that S1, related parameters are set according to the capture requirements, and intermediate frequency signals are read to be mixed with local carrier; S2, windowing is performed on PMF and FFT modules based on the conventional PMF+FFT to implement capturing; S3, an adaptive threshold adjustment method is adopted on signal peak judgment after FFT operation so as to obtain the capture result; S4, the process enters the tracking stage, frequency mixing and pseudo code correlation are performed on the intermediate frequency data and the result after correlation is integrally cleared so as to obtain a coherent integral value; S5, dimension enlarged unscented Kalman filter is adopted for carrier tracking, and the state vector optimal estimation value is obtained according to the dynamic model and the measurement model of the system; and S6, the conventional code ring under carrier aiding is adopted in code tracking. According to the method, the problems of rapid capture and tracking of the high dynamic satellite navigation signals can be solved, and the dynamic performance can be 100g.
Owner:BEIJING MXTRONICS CORP +1
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