| 摘要 |
Circuit protection devices comprise a PTC conductive polymer element within a hollow enclosure which is sealed except for at least one vent. The vent is sealed by means of a cover member, preferably of adhesive tape. The exterior surface of the enclosure adjacent the vent and under the cover member is provided with indentations which change the internal pressure required to blow the cover member off the vent, and/or enable the cover member to open during a hot washing step and subsequently to reseal without admitting wash liquid, and/or control the direction in which gases flow after passing through the vent.
|
