In the electronics packaging process,warpage and thermal stress are two important causes which lead to packaging *** this paper,ABAQUS is used to perform three-dimensional numerical simulation of eSiFo packaging produ...
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In the electronics packaging process,warpage and thermal stress are two important causes which lead to packaging *** this paper,ABAQUS is used to perform three-dimensional numerical simulation of eSiFo packaging products from the thermodynamic point of *** effects of different structural parameters on wafer warpage and thermal stress in electronic packages are *** the simulation part,single factor analysis,Taguchi orthogonal experiment design and finite element analysis are combined to obtain the optimized processparameters and perform simulation *** result shows that the structural parameter that has the greatest influence on the von Mises stress value of the wafer is the window *** the structural parameter that has the greatest influence on the wafer warpage is the Die *** thickness of the adhesive layer and the thickness of the passivation layer have a relatively small effect on the von Mises stress and the warpage value of the *** the optimized processparameters,the maximum von Mises stress and the maximum warpage value are much smaller than the initial process.
High pulsed electrical field as pre-processing step for fruits and vegetables in the vacuum freeze drying could increase drying rate efficiency and preserve nutritional ingredients in ***,high pulsed electrical field ...
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High pulsed electrical field as pre-processing step for fruits and vegetables in the vacuum freeze drying could increase drying rate efficiency and preserve nutritional ingredients in ***,high pulsed electrical field pretreatment has been successfully used to solve practical problems in the vacuum freeze drying,such as energy consumption,high production costs and long drying time *** drying experiments were conducted with apples which were pretreated by high pulsed electrical field,and the results showed that high pulsed electrical field pretreatment could increase the drying rate *** to the range analysis,the optimal parameters of high pulsed electrical field for drying were obtained as follows:pulse strength was 1000V·cm,pulse time was 120 μs,and pulse number was *** using the above optimal conditions,energy consumption per unit of water was reduced by17.74%,freeze drying time was shortened by 22.50%,and productivity per unit area was increased by 28.50%than results of the untreated *** addition,it was found that the most important physical factors of high pulsed electrical field which affected the vacuum freeze drying were the pulse duration,pulse strength and pulse number.
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