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Learning about Aerosol Filling Machines and the process of filling

9/13/2013 4:39:02 PM | by Anonymous

Aerosol Filling Machines

An Aerosol is made up of these basic components:

• Aerosol Can
• The Product
• The propellant
• A valve with dip tube
• An actuator
• A dust cap

An aerosol is defined as a colloidal system. It has either solid or liquid in a gas. It includes both particles and suspending gas which is usually air. There are different measures of aerosol concentration. Typically, environmental science and health often measure by mass concentration (M). It is defined as the mass of particulate matter per unit volume with units. Also another commonly used term is the number concentration (N). This refers to the the number of particles per unit volume with units. The size has a major influence on their properties. The aerosol particle radius and diameter is a key property used to characterize aerosol. They vary in their disperity.


They all have to be assembled by using automatic Aerosol Filling Machines. Aerosol Filling Machines can operate at speeds in excess of 400 cans per minute. Aerosol Filling Machines are basically devices that measure the determined volume, weight or number of products that fills a bag, box, bottle, sack, container, tube or any other type of packages.


There are several types of fillers being used by packaging industry, below are the listed common ones.


1. Agitator Filling Machines


It is designed to contain dry mixes like flour and sugar. The fillers are shaped similar to a cone that contains the mix and puts it in a pouch using an auger screw controlled by the agitator. The mix is filled into a pouch made of paper forming a collar and the pouch then gets sealed by a series of heat.


2. Flow filling machines


Designed to contain liquids, thin food products and oil. These fillers were designed when they fill a bottle or tub which enters the machine, it ejects the open bottle onto another conveyor proceeding to being sealed.


3. Tablet fillers


Designed for products counted by pieces instead of weight. They are designed for small bottles but the hopper of the filler is set up to permit scan counting.


For conventional aerosols, the key steps in the filling process are:


Step 1. Begin with an empty aerosol container. This can be made of either tinplate or aluminum or even glass sometimes. The capacity of the container will be greater than what is being declared on the pack.


Step 2. The product is usually in the liquid state when added. It contains all active ingredients maybe except for the propellant. The volume is very cautiously controlled to ensure that it conforms to the Weight and Measures legislation.


Step 3. The Aerosol valve is not crimped to the can. It is an extremely critical operation and the crimping machinery has to be carefully set up to ensure that the valve seal is tight and will not cause leakage. A small actuator is used. This will be fitted on to the valve before crimping onto the can.


After all is done, the propellant is now injected under pressure through a valve. It may be in the form of a liquefied gas or even compressed gas. If the liquefied gas exists, it will be in either liquid or vapour in the aerosol can head space. The volume in the can will then gradually increase. If a compressed gas is used instead, it will be above the liquid in the can and only in the head space. There will be no increase in liquid or gas volume. he volume of liquid is to be carefully controlled to ensure that it meets with all legislation requirements.


Also, the aerosol is now in a pressurized state due to the new addition. The cans are currently submerged in a water bath of 50 degree Celsius. This is done to check for any leaks. Leaked cans are usually rejected. If a larger, or special, actuator is required. It is now being fitted. Wherever necessary, a dust cap can also be fitted. Finally, all the cans will be dated and coded with shrink wrapped and boxed to be distributed.


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