The Research Of Soy Protein Liquid Spraying System And Atomized Law

In recent years, as people’s quality of life improvement, There is a growing emphasis on product packaging, especially food packaging. But the most used in food packaging materials are petroleum-based packaging materials, is difficult to natural degradation, can’t be recycled and many other issues. Coupled with China’s large population, the consumption of the packaging material is relatively large, not only increases the oil and other non renewable energy consumption, but also for people living environment caused serious pollution. This country to promote increased environmental protection, research and development and application of edible packaging materials, paper vegetable sources of raw materials because of having a rich, natural degradation level of renewable and many other advantages, has good practical value. But pure vegetable paper because they do not have heat-sealing properties can’ t be directly used as a packaging material, the subject of the research team proposed a pure vegetable paper as the substrate is soy protein liquid spray coating film prepared soy protein- vegetable composite paper that has heat sealing properties. Vegetable paper selection and preparation process of the composite soy protein liquid spray atomizer spray system law has an important impact on the quality of vegetables composite paper, the paper Tianjin Natural Science Fund Project "soy protein liquid rheological properties and atomized in law support research " under the characteristics of soy protein liquid having a high viscosity, a special study of soy protein liquid spray atomization system, and soy protein liquid atomization law measurement and analysis.Firstly, according to the paper composite vegetable spray coating process requirements and environmental equipment, electronic pulse select fan atomizing type spray nozzle, which can be better atomized spray quality and high-viscosity liquids at low gas consumption rate. Spray controllers on the system works, PWM flow control technology and spray parameters PID closed loop feedback regulation of technology a simple introduction.Secondly, soy protein liquid spray atomization field was measured and the effects of different parameters on the spraying of soy protein liquid spray atomized particle size distribution. Experiments using five different viscosity soy protein was used as a base fluid spray, Tianjin University, developed the use of L-Ⅲ laser particle size analyzer to measure different spray pressure, spraying hydraulic fluid spraying soybean protein particles atomized spray field Saunter mean diameter distribution(SMD), and the experimental results were analyzed and compared. The results showed that:(1) soy protein liquid spray atomization field axial distance 30 cm, at a radial distance 0cm with increasing spray pressure, soy protein liquid spray atomized particle size decreasing trend, other parameters unchanged from when the spraying pressure 0.12 MPa to 0.20 MPa, Saunter mean diameter of soy protein liquid spray atomized particles(SMD) from 40.44μm reduced to 28.02μm, with the spray pressure is further increased, atomized particles the Saunter mean diameter(SMD) change relatively slowly; with the increase of the hydraulic spraying, the Saunter mean diameter of soy protein liquid spray atomized particles existing obvious increasing trend then stabilized, spray pressure 0.20 MPa, spraying hydraulic respectively 0.12 MPa, 0.16 MPa, 0.20 MPa, when 0.24 MPa, Saunter mean diameter of spray atomized particles(SMD) is 22.86μm, 27.57μm, 28.02μm, 28.92μm; spraying when certain parameters, as soy protein increases the viscosity of the liquid, spray atomized particles Saunter mean diameter decreasing trend.(2) soy protein liquid viscosity, spray parameters are the same, in a spray atomization field with increasing axial distance, Saunter mean diameter of atomized particles showing a decreasing trend, and the rate of decrease after the first emergency relief; with increasing radial distance, Saunter mean diameter of atomized particles is small exhibit significant trend.Finally, soy protein liquid spray atomized particle velocity field measurements. Soy protein using high-speed cameras capture images of different spray field was sprayed spray pressure, spraying hydraulic pressure, flow coating, such as spraying parameters, the use of self MATLAB digital image correlation procedure to obtain soy protein liquid spray atomization velocity vector field. Calculation results show that soy protein liquid spray atomized spray particle velocity increases as pressure first and then decreases and then increases and increases the flow of spraying then decreased trend was spraying hydraulic pressure increases spraying atomized particles significantly increasing trend. At the same spray parameters, nozzle spray atomization at just below 30 cm particles faster than 10 cm below the nozzle at a smaller positive, but less affected by the spray parameters change, mainly in the field of spray atomization nozzle at just below 30 cm soy protein spray atomized particles greatly influenced by the environment of air resistance.