12-03-2015 дата публикации
Номер: US20150072121A1
Принадлежит:
An entry sheet comprising polymer material for drilling printed circuit boards is provided. The entry sheet is suitable for use with a broad range of diameters, including commonly available drill diameters. The entry sheet comprises an adhesive epoxy configured to, among others, resist drill deflection, resist mechanical damage, and reduce to dust such that the entry sheet may increase drilling accuracy, protect printed circuit board from damage, minimize entry burrs, and may addresses other issues such as fliers, bird nesting, and the like. 1. An entry sheet for drilling circuit boards , the entry sheet comprising:a substrate layer having a thickness of about 6 mils or less; andan entry sheet component provided over the substrate layer, wherein the entry sheet component has a thickness of about 6 mils or less.2. The entry sheet of claim 1 , wherein the entry sheet has a thickness in the range of about 4-12 mils.3. The entry sheet of claim 1 , wherein the substrate layer has a thickness in the range of about 1-6 mils.4. The entry sheet of claim 1 , wherein the entry sheet component has a thickness in the range of about 3-6 mils.5. The entry sheet of claim 1 , wherein the entry sheet is configured to be used with drill diameters in the range of about 0.10-6.7 mm.6. The entry sheet of claim 1 , wherein the entry sheet component comprises an adhesive.7. The entry sheet of claim 1 , wherein the entry sheet component comprises an epoxy.8. The entry sheet of claim 7 , wherein the epoxy is of the type bisphenol a/epichlorohydrin.9. The entry sheet of claim 1 , wherein the substrate layer comprises high-density fiberboard claim 1 , medium density fiberboard claim 1 , metal claim 1 , metal alloys claim 1 , paper claim 1 , melamine claim 1 , random fiber mats claim 1 , plastic claim 1 , chip board claim 1 , particle board claim 1 , phenolic claim 1 , phenolic supported with paper claim 1 , cloth claim 1 , or glass fiber claim 1 , solid phenolic sheets claim 1 , or laminated ...
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