| 摘要 |
<p>Sheet material comprising superimposed layers of material of differing compsn. is made by taking a web of paste up onto a drum where the thickness of each successive layer is monitored. PRef. monitor is coupled to a (programmed)system controlling the selection and proportions of constituents being fed to the web prodn. unit. Esp. for making fibrous mats with controlled variations in structure, porosity, etc. e.g. for filters, dielectric spacers or multicolour sheets.</p> |
