文档介绍：Basic Knowledge of the Aerosol
气雾剂基本知识
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The definement of Aerosol 气雾剂的定义
An Aerosol can be defined as:
An integral ready-to-use package incorporating a valve and a product which is dispensed by pre-stored pressure in a controlled manner when the valve is operated
气雾剂可被定义为:
气雾剂是指将内容物和抛射剂一起密封盛装在装有阀门的容器内,在抛射剂的压力下按预定形态喷出,一次使用的产品。这类产品以喷射的方式使用,喷出物可呈气态、液态或固态,喷出形状可为雾状、泡沫、粉末或胶束。
HOW AEROSOLS ARE FILLED 气雾剂是如何灌装的
An aerosol is made up of several ponents:
气雾剂的主要组成部分
An aerosol can 气雾罐
The product 内容物
The propellant 抛射剂
A valve with dip tube阀门及引液管
An actuator 喷嘴
A dust cap (not shown) 保护盖
HOW AEROSOLS ARE FILLED 气雾剂是如何灌装的
1. Start with an empty aerosol container.  This will be made of tinplate or aluminium, or perhaps glass. The capacity of the container will be greater than that which is declared on the pack. 
1、首先由空的气雾罐开始,气雾罐可以是马口铁罐、铝罐或玻璃罐
标称灌装量应不超过气雾罐全容积的80%
HOW AEROSOLS ARE FILLED 气雾剂是如何灌装的
2. The product, usually in the form of a liquid, is now added.
This contains all the active ingredients, except for the propellant.
The volume of liquid is very carefully controlled to ensure that it conforms with Weights & Measures legislation. 
2、现在开始添加内容物,通常情况下为液态。包含了除抛射剂之外
的所有有效成分。料液的体积按照标准规定受到严格控制。
HOW AEROSOLS ARE FILLED 气雾剂是如何灌装的
3. The Aerosol valve is now fitted (crimped) to the can. This is a very critical operation and the crimping machinery has to be carefully set up to ensure that the can / valve seal does not leak.
3、现在将阀门封在罐上,这一工序要求非常严格,封口机必须调整正
确,以保证罐/阀门密封处不会泄漏
HOW AEROSOLS ARE FILLED 气雾剂是如何灌装的
The propellant is now injected under pressure, through the valve.
The propellant may be in the form of a liquified gas, or pressed gas.
If a liquified gas is used it will exist as both a liquid, and vapour in the aerosol can head space. The volume of liquid in the can will increase, as shown in this example.
If pressed gas is used, it will usually only be in the head space, a