双向拉仲薄膜在线厚度检测及控制技术

为使双向拉伸薄膜在生产过程中保持薄膜厚度的均匀性,必须配备在线厚度检测装置对薄膜实施厚度检测和控制。本文介绍了双向拉伸薄膜在线厚度控制的技术现状,以及SCANTECH双向拉伸薄膜在线厚度控制解决方案,即全自动摸头螺栓对位系统及软件的特点和优势。     

薄膜厚度在线检测及全自动剖面控制系统介绍

在生产过程中,薄膜厚度的均匀性直接关系到产品等级品率、价格及企业效益,所以在薄膜生产线上配备在线厚度检测及自动控制系统是非常必要的。     

软包材厚度均匀性与包装成本

控制好薄膜厚度的均匀性有利于降低企业的包装成本，减少由于原油价格上涨对包装企业带来的影响。本文详细介绍了薄膜厚度均匀性对产品包装的重要性，并对薄膜厚度和涂层厚度的检测方法进行了深入的探讨。     

双向拉仲薄膜在线厚度检测及控制技术

在双向拉伸薄膜的生产过程中，控制薄膜匣度的均匀性十分重要，因其会对下游产品的加工产生直接的质量影响。本文详细介绍了薄膜厚度均匀性的影响因素．控制方法以及相关的检测设备和软件。     

双向拉伸薄膜在线厚度检测及控制技术

本文介绍了双向拉伸薄膜在线厚度检测及控制技术。     

用HW—MWECR CVD系统沉积大面积均匀氢化非晶硅薄膜的研究

通过紫外-可见透射谱技术,计算得到薄膜各个位置的拟合厚度值,研究了a-si:H薄膜的厚度均匀性;通过对紫外-可见透射谱的分析和对红外吸收谱峰宽度的分析,研究了a-Si:H薄膜的结构均匀性.研究发现对于单磁场线圈MWECR CVD系统,ECR区的不均匀性和沉积室的磁场梯度的不均匀,是影响a-Si:H薄膜均匀性的主要原因.通过改进矩形耦合波导和热丝辅助及减小磁场线圈电流的方法,采用HW-MWECR CVD 系统,在直径为6cm的衬底上沉积了厚度不均匀性<3.5%的a-Si:H薄膜.     

PET薄膜的品质控制及其性能检测

对包装用双向拉伸PET薄膜的厚度均匀性、机械性能、光学性能、表面性能、热性能及阻隔性能等的品质控制及其性能检测等问题进行了论述。     

吹塑薄膜在线检测膜厚新方法

一直以来,人们普遍认为电容式膜厚量规不适用于在线检测吹塑薄膜的厚度,尤其是不能用于检测阻隔性薄膜的厚度.但在K 2004展会上,几乎所有的电容式量规制造厂商都展出了可用于检测阻隔性薄膜的电容量规新产品.     

厚度不均匀对PET薄膜分切的影响

介绍了PET薄膜厚度直观的量化指标,并从厚度偏薄和偏厚2个方面阐述了厚度均匀性对PET薄膜分切的影响。     

改性聚三氟氯乙烯介电薄膜制备工艺的优化

为满足多层电路对改性聚三氟氯乙烯(PCTFE)薄膜厚度的精度及均匀性的要求,采用熔融流延工艺制备了改性PCTFE薄膜。通过设计正交试验,以料腔温度、挤出速度、拉伸速度为变量,设计3因素3水平实验9组。采用方差分析,分析不同实验条件下改性PCTFE薄膜的厚度,结果显示不同条件制备的薄膜厚度具有显著差异,以料腔温度265℃、挤出速度1.8m/min、拉伸速度1.7m/min制备的改性PCTFE薄膜,厚度为(0.045±0.003)mm,相对介电常数为2.2624,介电损耗为2.13×10~(–3),连续3批次改性PCTFE薄膜的厚度、相对介电常数和介电损耗的过程能力指数C_(pk)分别为1.04、1.05和1.09,可满足高频微波电路对材料厚度和介电性能的均匀性及一致性的要求。     

Process model structures for transverse direction gauge control of tentered polymeric film

One of the most successful applications of multiple input multiple output control is the control of thickness in sheet forming processes including paper making and plastic film casting. While there are many similarities between film manufacture and other sheet forming processes, the physics differs from process to process. The choice of both process model and optimal control algorithm must reflect these differences. Here we consider how the basic physics of film manufacture a reflected in two classes of process models: phenomenological (interaction) models used in conventional gauge control algorithms and mechanistic models based on engineering science. Mechanistic models are more mathematically robust than purely statistical phenomenological models for some aspects of gauge control and may prove advantageous for other sheet forming applications.     

Modeling and control of film porosity in thin film deposition

Systematic methodologies are developed for modeling and control of film porosity in thin film deposition. The deposition process is modeled via kinetic Monte Carlo (kMC) simulation on a triangular lattice. The microscopic events involve atom adsorption and migration and allow for vacancies and overhangs to develop. Appropriate definitions of film site occupancy ratio (SOR), i.e., fraction of film sites occupied by particles over total number of film sites, and its fluctuations are introduced to describe film porosity. Deterministic and stochastic ordinary differential equation (ODE) models are also derived to describe the time evolution of film SOR and its fluctuation. The coefficients of the ODE models are estimated on the basis of data obtained from the kMC simulator of the deposition process using least-square methods and their dependence on substrate temperature is determined. The developed ODE models are used as the basis for the design of model predictive control (MPC) algorithms that include penalty on the film SOR and its variance to regulate the expected value of film SOR at a desired level and reduce run-to-run fluctuations. Simulation results demonstrate the applicability and effectiveness of the proposed film porosity modeling and control methods in the context of the deposition process under consideration.     

Regulation of film thickness, surface roughness and porosity in thin film growth using deposition rate

This work focuses on distributed control of film thickness, surface roughness and porosity in a porous thin film deposition process using the deposition rate as the manipulated input. The deposition process includes adsorption and migration processes and it is modeled via kinetic Monte Carlo simulation on a triangular lattice with vacancies and overhangs allowed to develop inside the film. A distributed parameter (partial differential equation) dynamic model is derived to describe the evolution of the surface height profile of the thin film accounting for the effect of deposition rate. The dynamics of film porosity, evaluated as film site occupancy ratio, are described by an ordinary differential equation. The developed dynamic models are then used as the basis for the design of a model predictive control algorithm that includes penalty on the deviation of film thickness, surface roughness and film porosity from their respective set-point values. Simulation results demonstrate the applicability and effectiveness of the proposed modeling and control approach in the context of the deposition process under consideration.     

可降解可除草地膜的裸露降解试验和在黄瓜栽培上的应用试验

本文考察了可降解可除草地膜在田间裸露降解情况和应用于黄瓜栽培中的降解情况及抑制效果。试验表明我们研制的可降解可除草地膜降解情况良好，抑草效果显著，这对减缓“白鬼污染”，保护农业生态环境促进农业的增产增收极具意义。     

浅述一种在线生产阳光控制低辐射镀膜玻璃的方法

介绍了一种在线生产阳光控制低辐射镀膜玻璃的方法,它是用常压CVD法将汽化的液态气体喷涂在625—640℃左右的玻璃表面,热解生成含掺杂剂锑的近红外（NIR）阳光吸收底层,顶层为含掺杂剂氟的对中远红外具有反射低热辐射控制层。产品既具有低辐射性能又具有阳光控制性能。     

The InN epitaxy via controlling In bilayer

The method of In bilayer pre-deposition and penetrated nitridation had been proposed, which had been proven to have many advantages theoretically. To study the growth behavior of this method experimentally, various pulse times of trimethylindium supply were used to get the optimal indium bilayer controlling by metalorganic vapour phase epitaxy. The results revealed that the InN film quality became better as the thickness of the top indium atomic layers was close to bilayer. A following tuning of nitridation process enhanced the quality of InN film further, which means that a moderate, stable, and slow nitridation process by NH3 flow also plays the key role in growing better-quality InN film. Meanwhile, the biaxial strain of InN film was gradually relaxing when the flatness was increasingly improved.     

钢结构涂装的膜厚管理

从膜厚管理的特点、膜厚的检测和判断、膜厚的质量控制等角度探讨了膜厚管理对确保钢结构防腐性能、减少耗漆量的影响.     

机头内熔料流动模拟及微机控制吹膜技术

用计算机建立了吹塑薄膜机头仿真模型，以展示机头的内部结构，模拟了塑料熔料在机头内部的流动状态，并介绍了吹膜过程中微机控制技术应用的现状。     

塑料薄膜雾度及其控制的研究进展

综述了塑料薄膜雾度的相关研究,对不同树脂薄膜的雾度特性进行了分类,总结了不同塑料薄膜雾度的形成机理,分析了塑料薄膜雾度的影响因素,最后指出了现在研究的缺陷和今后研究的重点。     

布鲁克纳公司BOPET薄膜生产线控制系统

介绍了德国布鲁克纳公司双轴定向拉伸聚酯薄膜生产线的控制系统和对生产线的一些改进 ,生产线设计建立在不断研究和试验的基础上 ,因而许多地方可圈可点。诸如主计算机的软硬件配置 ,输料方式、体积计量方法等。