公开(公告)号：US4929370A

公开(公告)日：1990-05-29

申请号：US390496

申请日：1989-08-01

申请人： William R. Hatch ,  John W. Foster

发明人： William R. Hatch ,  John W. Foster

IPC分类号： B23Q11/10 ,  H05K3/00

CPC分类号： H05K3/0047 ,  H05K2203/0769 ,  H05K2203/0786 ,  H05K2203/127 ,  Y10T408/03

摘要： Thru-holes are drilled in a printed circuit board panel having alternating dielectric layers and electrically conductive layers. A water soluble dry film lubricant sheet is placed adjacent an electrically conductive outer layer of the panel prior to drilling thru-holes through the panel with a rotary drill. The drill surface is lubricated while forming a clean thru-hole from contact between the drill and the lubricant. The dry film lubricant generally may comprise a water soluble lubricant hardened to a solid or semi-solid dry film-form and impregnated in a carrier such as a porous paper sheet. In one embodiment, the dry film lubricant includes a water soluble lubricant such as dipropylene glycol, a non-ionic surfactant, and a wax-like hardener. Following drilling of the thru-holes, the dry film lubricant sheet is removed, and the thru-holes can be rinsed in an aqueous alkaline solution. The thru-holes are then plated with an electrically conductive metal for forming electrical contacts between the metalized thru-holes and the electrically conductive layers of the panel. The dry film lubricant extends drill life and produces a clean thru-hole that prevents epoxy smear and avoids the prior art use of harsh chemical treatment following drilling to otherwise remove dielectric smear or fibers that might extend into the thru-hole and disrupt the continuity of the later-formed electrical contact.

摘要翻译： 在具有交替电介质层和导电层的印刷电路板面板上钻出通孔。 在通过旋转钻机穿过面板钻通孔之前，将水溶性干膜润滑剂片放置在面板的导电外层附近。 钻孔表面被润滑，同时从钻头和润滑剂之间的接触形成干净的通孔。 干膜润滑剂通常可以包含硬化至固体或半固体干膜形式并浸渍在诸如多孔纸片的载体中的水溶性润滑剂。 在一个实施方案中，干膜润滑剂包括水溶性润滑剂如二丙二醇，非离子表面活性剂和蜡状固化剂。 在钻孔之后，除去干膜润滑剂片，并且可以在碱性水溶液中漂洗通孔。 然后用导电金属涂覆通孔，用于在金属化的通孔和面板的导电层之间形成电接触。 干膜润滑剂延长钻头寿命并产生清洁的通孔，防止环氧树脂涂抹，并避免现有技术在钻孔后采用严酷的化学处理，以除去可能延伸到通孔中的介电涂片或纤维，并破坏连续性 后来形成的电接触。

公开(公告)号：US4781495A

公开(公告)日：1988-11-01

申请号：US919085

申请日：1986-10-14

申请人： William R. Hatch ,  John W. Foster

发明人： William R. Hatch ,  John W. Foster

IPC分类号： B23Q11/10 ,  H05K3/00 ,  B23B51/06 ,  B23B35/00

CPC分类号： H05K3/0047 ,  B23Q11/1061 ,  H05K2203/0769 ,  H05K2203/0786 ,  H05K2203/127 ,  Y10T408/03 ,  Y10T408/44

摘要： Thru-holes are drilled in a printed circuit board panel having alternating dielectric layers and electrically conductive layers. A water soluble dry film lubricant sheet is placed adjacent an electrically conductive outer layer of the panel prior to drilling thru-holes through the panel with a rotary drill. The drill surface is lubricated while forming a clean thru-hole from contact between the drill and the lubricant. The dry film lubricant generally may comprise a water soluble lubricant hardened to a solid or semi-solid dry film-form and impregnated in a carrier such as a porous paper sheet. In one embodiment, the dry film lubricant includes a water soluble lubricant such as dipropylene glycol, a non-ionic surfactant, and a wax-like hardener. Following drilling of the thru-holes, the dry film lubricant sheet is removed, and the thru-holes can be rinsed in an aqueous alkaline solution. The thru-holes are then plated with an electrically conductive metal for forming electrical contacts between the metalized thru-holes and the electrically conductive layers of the panel. The dry film lubricant extends drill life and produces a clean thru-hole that prevents epoxy smear and avoids the prior art use of harsh chemical treatment following drilling to otherwise remove dielectric smear or fibers that might extend into the thru-hole and disrupt the continuity of the later-formed electrical contact.

公开(公告)号：US4410498A

公开(公告)日：1983-10-18

申请号：US312252

申请日：1981-10-16

申请人： William R. Hatch ,  Ronald R. Dunn

发明人： William R. Hatch ,  Ronald R. Dunn

IPC分类号： B01D11/00 ,  B01F1/00 ,  C01G53/10 ,  C22B20060101 ,  C22B3/00 ,  C22B23/00 ,  C22B23/04

CPC分类号： C22B23/043

摘要： Sulphuric acid leaching has been used in the treatment of lateritic ores for the recovery of nickel and cobalt therefrom. However, in order to obtain good extraction from these ores, prolonged treatment using acid of high strength and also using high pressures and recycling steps have been necessary. In the improved method of the invention nickel and cobalt is solubilized from high-magnesia nickeliferous serpentine ores by leaching the ore with an aqueous solution of sulphuric acid while adding to the solution a reducing agent to maintain the redox potential of the solution at a value between 200 and 400 millivolts, measured against the saturated calomel electrode. This improved procedure increases the reactivity of the serpentine and results in maximum extraction of nickel consistent with minimum extraction of iron and magnesia and minimum acid consumption.

摘要翻译： 硫酸浸出已被用于处理红土矿石以从其中回收镍和钴。 然而，为了从这些矿石中获得良好的萃取，需要使用高强度的酸和使用高压和再循环步骤的长时间处理。 在本发明的改进方法中，镍和钴通过用硫酸水溶液浸出矿石从高氧化镁含镍蛇纹石矿石中溶解，同时向溶液中加入还原剂，以使溶液的氧化还原电位保持在 根据饱和甘汞电极测量200和400毫伏。 这种改进的方法提高了蛇纹石的反应性，并导致镍的最大提取，与铁和氧化镁的最小提取和最小的酸消耗量一致。