| 摘要 |
A device for the controlled release of vapour and a method of dispensing a volatile medium into the air. The device includes a carrier impregnated with a volatile medium and a wrapper of flexible material surrounding said carrier for retaining the volatile medium on the carrier. Said wrapper has at least two contiguous tear strips disposed over the carrier that may be successively removed to expose a portion of the carrier of increasing size without any need to provide for relative movement of the wrapper and carrier. The method of dispensing a volatile medium into the air includes providing such a device, removing a first tear strip to expose a portion of the carrier, and subsequently removing an additional tear strip to expose a fresh area of carrier to maintain the concentration of volatile medium at desired level. |
