1468298 Etching: etching apparatus BUCKBEE-MEARS CO 20 Sept 1974 [11 July 1974] 40988/74 Heading BJ In a method of etching an aperture in a web 9, a first resist layer 42 defining an unprotected region X 1 is provided on one surface of the web, a second resist layer 44 defining a larger unprotected region X 2 is provided on the second surface of the web, the web is etched to provide dished regions (as shown), the resist layer 42 is then covered with a further resist layer 43 covering the region X 1 and the second surface of the web is further etched to provide an opening extending through the material of the web. The resist may be a polymeric plastics material. Etching apparatus.-A shadow mask for a colour television tube is produced by the above method in a continuously operating apparatus comprising a first spray etching chamber 11, a spray rinsing chamber 12, a drying chamber 13 having heaters 23 and 24, a spray coating chamber 14 (for providing resist layer 43), drying chamber 15 and further spray etching chamber 16.
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机译：1468298蚀刻：蚀刻设备BUCKBEE-MEARS CO 1974年9月20日[1974年7月11日] 40988/74标题BJ在蚀刻纤网9中的孔的方法中，在一个表面上提供了定义无保护区域X 1的第一抗蚀剂层42在纤维网的第二层中，在纤维网的第二表面上提供限定较大的未保护区域X 2的第二抗蚀剂层44，蚀刻纤维网以提供凹陷的区域（如图所示），然后用另外的抗蚀剂覆盖抗蚀剂层42覆盖区域X 1和网的第二表面的层43被进一步蚀刻以提供延伸穿过网的材料的开口。抗蚀剂可以是聚合物塑料材料。蚀刻设备。-通过上述方法在连续操作的设备中制造用于彩色电视管的荫罩，该设备包括第一喷雾蚀刻室11，喷雾冲洗室12，具有加热器23和24的干燥室13，喷涂层。室14（用于提供抗蚀剂层43），干燥室15和进一步的喷雾蚀刻室16。
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